Patent Publication Number: US-11640044-B2

Title: Electronic device

Description:
RELATED APPLICATIONS 
     This application is a continuation of U.S. application Ser. No. 16/819,276, filed on Mar. 16, 2020, which is a continuation of U.S. application Ser. No. 15/869,314, filed on Jan. 12, 2018, U.S. Pat. No. 10,634,873 issued on Apr. 28, 2020, and claims priority to U.S. Provisional Application Ser. No. 62/565,173, filed on Sep. 29, 2017, the entire contents of which are hereby incorporated herein by reference. 
    
    
     BACKGROUND 
     Technical Field 
     The present disclosure relates to an electronic device. More particularly, the present disclosure relates to an electronic device with at least one optical lens assembly. 
     Description of Related Art 
     With rapid developments of technologies, the application of photographing modules is becoming wider and wider, and the application technologies of three-dimensional space observation are also increasingly mature. Conventional three-dimensional space identification technologies are mostly limited to two-dimensional images, and can achieve three-dimensional spatial analysis functions with algorithms, however, when information of three-dimensional space of information is simplified into the two-dimensional space image, it will always result in information gaps, and limit restore results of calculation. 
     Thus, a three-dimensional image capture technology is developed, which projects light with particular characteristics (such as specific wavelengths and patterns, etc.) onto an object, the light is reflected by the object, and then received by a lens assembly and be calculated so as to obtain the distance between each position of the object and the lens assembly, and determine information of the three-dimensional image. The technology is widely applied to electronic device, such as somatosensory games, virtual reality, augmented reality, three-dimensional image capturing, dynamic capturing, face recognitions, driving assisting systems, various kinds of smart electronic products, multi-lens devices, wearable devices, surveillance equipments, digital cameras, identification systems, entertainment devices, sports devices and intelligent home assisting systems, presently. 
     Nowadays, three-dimensional image capturing technologies mostly adopts infrared in a specific wavelength band to reduce interference so as to achieve more accurate measurements. However, with applications, such as face recognition and augmented reality, being used in portable devices, such as smart phones are gradually developed, the sensing module thereof needs to be more precise and compact, but conventional technologies are still difficult to achieve the balance between the two. 
     SUMMARY 
     According to one aspect of the present disclosure, an electronic device includes at least one optical lens assembly. The optical lens assembly includes four lens elements, and the four lens elements are, in order from an outside to an inside, a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element has an outside surface being convex in a paraxial region thereof. The second lens element has an inside surface being convex in a paraxial region thereof. The fourth lens element has an inside surface being concave in a paraxial region thereof, wherein at least one of an outside surface and the inside surface of the fourth lens element includes at least one critical point in an off-axis region thereof. When a measurement is made in accordance with a reference wavelength as a d-line, an Abbe number of the first lens element is Vd1, an Abbe number of the second lens element is Vd2, an Abbe number of the third lens element is Vd3, an Abbe number of the fourth lens element is Vd4, a focal length of the optical lens assembly is fd, a focal length of the third lens element is fd3, and a focal length of the fourth lens element is fd4, the following conditions are satisfied:
 
0.65&lt; Vd 1/ Nd 2&lt;1.54;
 
0.65&lt; Vd 1/ Nd 3&lt;1.54;
 
0.65&lt; Vd 1/ Nd 4&lt;1.54;
 
10.0&lt; Vd 1&lt;38.0; and
 
0.69&lt;| fd/fd 3|+| fd/fd 4|.
 
     According to one aspect of the present disclosure, an electronic device includes at least one optical lens assembly. The optical lens assembly includes four lens elements, and the four lens elements are, in order from an outside to an inside, a first lens element, a second lens element, a third lens element and a fourth lens element. The second lens element has an outside surface being concave in, a paraxial region thereof and an inside surface being convex in a paraxial region thereof. The third lens element has an outside surface being concave in a paraxial region thereof. The fourth lens element has an outside surface being convex in a paraxial region thereof and an inside surface being concave in a paraxial region thereof, wherein the outside surface of the fourth lens element includes at least one critical point in an off-axis region thereof. At least one of the third lens element and the fourth lens element has positive refractive power, and the other one has negative refractive power. When a measurement is made in accordance with a reference wavelength as a d-line, an Abbe number of the first lens element is Vd1, an Abbe number of the second lens element is Vd2, an Abbe number of the third lens element is Vd3, an Abbe number of the fourth lens element is Vd4, a focal length of the optical lens assembly is fd, a focal length of the third lens element is fd3, and a focal length of the fourth lens element is fd4, the following conditions are satisfied:
 
0.65&lt; Vd 1/ Nd 2&lt;1.54;
 
0.65&lt; Vd 1/ Vd 3&lt;1.54;
 
0.65&lt; Vd 1/ Vd 4&lt;1.54; and
 
0.69&lt;| fd/fd 3|+| fd/fd 4|&lt;2.65.
 
     According to one aspect of the present disclosure, an electronic device includes a sensing module, which includes a projection apparatus and a receiving apparatus. The projection apparatus includes an optical lens assembly and at least one light source, wherein the optical lens assembly includes four to six lens elements, and the light source is disposed on an inside conjugation surface of the optical lens assembly. The receiving apparatus includes an optical lens assembly and an image sensor, wherein the optical lens assembly includes four to six lens elements, and the image sensor is disposed on an inside conjugation surface of the optical lens assembly. The light source of the projection apparatus is projected on a sensed object and is received by the receiving apparatus after a reflection, and is imaged on the image sensor. When a measurement is made in accordance with a reference 0.5 wavelength as a d-line, at least six lens elements of the lens elements of the optical lens assembly of the projection apparatus and the lens elements of the optical lens assembly of the receiving apparatus have Abbe numbers smaller than 38. In the optical lens assembly of each of the projection apparatus and the receiving apparatus, an axial distance between an outside surface of one of the lens elements closest to the outside and an inside surface of one of the lens elements closest to the inside is TD, and the following condition is satisfied:
 
1 mm&lt;TD&lt;5 mm.
 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present disclosure can be more fully understood by reading the following detailed description of the embodiment, with reference made to the accompanying drawings as follows: 
         FIG.  1    is a schematic view of an electronic device according to the 1st embodiment of the present disclosure; 
         FIG.  2    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 1st embodiment; 
         FIG.  3    is a schematic view of an electronic device according to the 2nd embodiment of the present disclosure; 
         FIG.  4    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 2nd embodiment; 
         FIG.  5    is a schematic view of an electronic device according to the 3rd embodiment of the present disclosure; 
         FIG.  6    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 3rd embodiment; 
         FIG.  7    is a schematic view of an electronic device according to the 4th embodiment of the present disclosure; 
         FIG.  8    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 4th embodiment; 
         FIG.  9    is a schematic view of an electronic device according to the 5th embodiment of the present disclosure; 
         FIG.  10    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 5th embodiment; 
         FIG.  11    is a schematic view of an electronic device according to the 6th embodiment of the present disclosure; 
         FIG.  12    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 6th embodiment; 
         FIG.  13    is a schematic view of an electronic device according to the 7th embodiment of the present disclosure; 
         FIG.  14    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 7th embodiment; 
         FIG.  15    is a schematic view of an electronic device according to the 8th embodiment of the present disclosure; 
         FIG.  16    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 8th embodiment; 
         FIG.  17    is a schematic view of an electronic device according to the 9th embodiment of the present disclosure; 
         FIG.  18    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 9th embodiment; 
         FIG.  19    is a schematic view of an electronic device according to the 10th embodiment of the present disclosure; 
         FIG.  20    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 10th embodiment; 
         FIG.  21    is a schematic view of an electronic device according to the 11th embodiment of the present disclosure; 
         FIG.  22    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 11th embodiment; 
         FIG.  23    is a schematic view of an electronic device according to the 12th embodiment of the present disclosure; 
         FIG.  24    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 12th embodiment; 
         FIG.  25    is a schematic view of critical points according to the 1st embodiment of  FIG.  1   ; 
         FIG.  26 A  is a schematic view of a sensing module of an electronic device according to the 13th embodiment of the present disclosure; 
         FIG.  26 B  is a schematic view of an appearance of one side of the electronic device according to the 13th embodiment of the present disclosure; 
         FIG.  26 C  is a schematic view of an appearance of the other side of the electronic device according to the 13th embodiment of the present disclosure; 
         FIG.  27 A  is a schematic view of an appearance of the using state of an electronic device according to the 14th embodiment of the present disclosure; 
         FIG.  27 B  is a schematic view of a sensing module of the electronic device according to the 14th embodiment of the present disclosure; and 
         FIG.  28    is a schematic view of an electronic device according to the 15th embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     An electronic device includes at least one optical lens assembly, which can be applied to an infrared band, especially for the application of infrared projection and reception. Thus, it is favorable for adapting to three-dimensional image capturing technologies by obtaining high precision of projection ability and high image quality and also maintaining compactness. 
     The optical lens assembly can include four to six lens elements, so that it is favorable for obtaining higher precision of projection ability and higher image quality, and also maintaining compactness of the optical lens assembly. Preferably, the optical lens assembly can include four lens elements, which are, in order from an outside to an inside, a first lens element, a second lens element, a third lens element, and a fourth lens element. 
     The first lens element can have an outside surface being convex in a paraxial region thereof, so that it is favorable for reducing the incident angle of the light from wide field of view so as to be applicable to the design of wide field of view in the optical lens assembly. The first lens element can have positive refractive power, so that the demand of compact size can be obtained by reducing the total track length of the optical lens assembly. The first lens element can have an inside surface being concave in a paraxial region thereof, so that the generation of astigmatism can be reduced. 
     The second lens element can have an outside surface being concave in a paraxial region thereof, so that it is favorable for increasing field of view by arranging sufficient space between the first lens element and the second lens element. The second lens element can have an inside surface being convex in a paraxial region thereof, so that it is favorable for correcting off-axis aberrations by adjusting the path of exiting light. The second lens element can have positive refractive power, so that it is favorable for reducing spherical aberrations by balancing the distribution of positive refractive power of the optical lens assembly. 
     The third lens element can have an outside surface being concave in a paraxial region thereof, so that off-axis aberrations can be reduced. The third lens element can have positive refractive power, so that the positive refractive power of the optical lens assembly can be diverged, which can be favorable for avoiding excessive spherical aberrations generated by the optical lens assembly during the total track length is reduced, and also favorable for reducing the sensitivity. The third lens element can have an inside surface being convex in a paraxial region thereof, so that it is favorable for lessening the stray light by reducing the surface reflection of light. 
     The fourth lens element can have an outside surface being convex in a paraxial region thereof, so that it is favorable for enhancing the image quality in a peripheral region by correcting field curvature in the off-axis region thereof. The fourth lens element can have an inside surface being concave in a paraxial region thereof, so that the back focal length and the total track length can be reduced. Furthermore, at least one of the outside surface and the inside surface of the fourth lens element can include at least critical point in an off-axis region thereof, so that it is favorable for correcting off-axis aberrations, and also favorable for reducing the surface reflection by adjusting the incident angle and exiting angle of light in a peripheral region. The outside surface of the fourth lens element can include at least one critical point in the off-axis region thereof which can further correct off-axis aberrations. The inside surface of the fourth lens element can include at least one critical point in the off-axis region thereof so as to further reduce the surface reflection of light in a peripheral region. 
     Furthermore, one of the third lens element and the fourth lens element can have positive refractive power, the other one thereof can have negative refractive power. Therefore, it is favorable for reducing the generation of aberrations by complementary effect of the third lens element and the fourth lens element. 
     One of the outside surface and the inside surface of each of the first lens element, the second lens element, the third lens element and the fourth lens element can be concave in a paraxial region thereof, and the other one thereof can be convex in a paraxial region thereof. Therefore, it is favorable for obtaining compactness and increasing the optical effective region of an inside conjugation surface. 
     When a measurement is made in accordance with a reference wavelength as a d-line, an Abbe number of the first lens element is Vd1, an Abbe number of the second lens element is Vd2, an Abbe number of the third lens element is Vd3, and an Abbe number of the fourth lens element is Vd4, the following conditions are satisfied: 0.65&lt;Vd1/Vd2&lt;1.54; 0.65&lt;Vd1/Vd3&lt;1.54; and 0.65&lt;Vd1/Vd4&lt;1.54. Therefore, it is favorable for correcting aberrations by matching the materials of the lens elements. Especially, correction of chromatic aberrations is not that important when the optical lens assembly is applied to the infrared band, so that the complexity thereof can be reduced, and it is favorable for correcting other kind of aberrations and reducing the size thereof so as to obtain compact optical lens assembly with high image quality. Preferably, the following conditions can be satisfied: 0.70&lt;Vd1/Vd2&lt;1.44; 0.70&lt;Vd1/Vd3&lt;1.44; and 0.70&lt;Vd1/Vd4&lt;1.44. More preferably, the following conditions can be satisfied: 0.75&lt;Vd1/Vd2&lt;1.35; 0.75&lt;Vd1/Vd3&lt;1.35; and 0.75&lt;Vd1/Vd4&lt;1.35. In detail, the Abbe numbers are calculated by Vd=(Nd−1)/(NF−NC), wherein Nd is the refractive index measured with a wavelength as helium d-line (587.6 nm), NF is the refractive index measured with a wavelength as hydrogen F-line (486.1 nm), and NC is the refractive index measured with a wavelength as hydrogen C-line (656.3 nm). 
     When the measurement is made in accordance with the reference wavelength as the d-line, the Abbe number of the first lens element is Vd1, the following condition is satisfied: 10.0&lt;Vd1&lt;38.0. Therefore, chromatic aberrations of the optical lens assembly can be reduced, and it is favorable for correcting aberrations and obtaining compactness by utilizing the material with low Abbe number which has more excellent ability of light refraction. Preferably, the following condition can be satisfied: 12.0&lt;Vd1&lt;34.0. More preferably, the following condition can be satisfied: 14.0&lt;Vd1&lt;30.0. 
     When the measurement is made in accordance with the reference wavelength as the d-line, a focal length of the optical lens assembly is fd, a focal length of the third lens element is fd3, and a focal length of the fourth lens element is fd4, the following condition is satisfied: 0.69&lt;|fd/fd3|+|fd/fd4|. Therefore, it is favorable for correcting off-axis aberrations and reducing the total track length of the optical lens assembly by matching the refractive power of the third lens element and the fourth lens element. Preferably, the following condition can be satisfied: 0.69&lt;|fd/fd3|−|d/fd4|&lt;5.0. Thus, it is favorable for avoiding excessive spherical aberrations and reducing the size by avoiding excessive refractive power of the lens elements. More preferably, the following condition can be satisfied: 0.69&lt;|fd/fd3|+|fd/fd4|&lt;2.65. 
     When the measurement is made in accordance with the reference wavelength as the d-line, a refractive index of the first lens element is Nd1, the following condition is satisfied: 1.650≤Nd1&lt;1.750. Therefore, it is favorable for correcting aberrations by arranging the material with high refractive index so as to reduce the size of the optical lens assembly, especially for the infrared, which is hard to be refracted. 
     When the measurement is made in accordance with the reference wavelength as the d-line, a sum of the Abbe numbers of the first lens element, the second lens element, the third lens element and the fourth lens element is ΣVd, the following condition is satisfied: 40.0&lt;ΣVd&lt;155.0. Therefore, it is favorable for reducing the size and correcting aberrations by adjusting the arrangement of materials of the lens elements, especially the application in the infrared band which provides more obvious effect. Preferably, the following condition can be satisfied: 45.0&lt;ΣVd&lt;125.0. More preferably, the following condition can be satisfied: 50.0&lt;ΣVd&lt;100.0. 
     When a central thickness of the second lens element is CT2, and a central thickness of the fourth lens element is CT4, the following condition is satisfied: 0&lt;CT2/CT4&lt;1.04. Therefore, it is favorable for reducing coma aberrations by obtaining proper thicknesses of the second lens element and the fourth lens element. 
     When a curvature radius of the outside surface of the first lens element is R1, and a curvature radius of the inside surface of the first lens element is R2, the following condition is satisfied: 0.32&lt;R1/R2&lt;1.64. Therefore, it is favorable for reducing astigmatism by arranging proper surface shape of the first lens element. 
     When the curvature radius of the inside surface of the first lens element is R2, and a curvature radius of the outside surface of the fourth lens element is R7, the following condition is satisfied: 0.25&lt;R2/R7&lt;4.8. Therefore, it is favorable for correcting off-axis field curvature by arranging proper surface shapes of the first lens element and the fourth lens element. 
     When the measurement is made in accordance with the reference wavelength as the d-line, the focal length of the optical lens assembly is fd, the focal length of the third lens element is fd3, the focal length of the fourth lens element is fd4, and a maximum of two values of |fd/fd3| and |fd/fd4| is max(|fd/fd3|, |fd/fd4|), and the following condition is satisfied: 0.43&lt;max(|fd/fd3|, |fd/fd4|)&lt;2.7. Therefore, it is favorable for correcting distortion by matching the refractive power of the third lens element and the fourth lens element, and avoiding too weak or excessive refractive power at the same time. Preferably, the following condition can be satisfied: 0.53&lt;max(|fd/fd3|, |fd/fd4|)&lt;1.8. 
     When the measurement is made in accordance with the reference wavelength as the d-line, a focal length of the first lens element is fd1, a focal length of the second lens element is fd2, the focal length of the third lens element is fd3, and the focal length of the fourth lens element is fd4, the following condition is satisfied: 0.38&lt;(|1/fd1|+|1/fd2|)/(|1/fd3|+|1/fd4|)&lt;1.5. Therefore, it is favorable for correcting spherical aberration and distortion by properly adjusting the distribution of the refractive power on the inside and the outside of the optical lens assembly. 
     When an f-number of the optical lens assembly is Fno, the following condition is satisfied: 1.0&lt;Fno&lt;2.3. Therefore, when the optical lens assembly is applied to a projection apparatus, the illumination of an outside conjugation surface thereof can be enhanced; when the optical lens assembly is applied to an image capturing apparatus or a receiving apparatus, the illumination on a peripheral region of the inside conjugation surface thereof can be enhanced. 
     When half of a maximum field of view of the optical lens assembly is HFOV, the following condition is satisfied: 5 degrees&lt;HFOV&lt;50 degrees. Therefore, it is favorable for avoiding excessive field of view which would cause too much aberrations, such as distortions. Preferably, the following condition can be satisfied: 30 degrees&lt;HFOV&lt;50 degrees. Thus, it is favorable for avoiding too small field of view which would reduce the application range. 
     When an axial distance between an outside surface of one of the lens elements closest to the outside and an inside surface of one of the lens elements closest to the inside is TD, the following condition is satisfied: 1 mm&lt;TD&lt;5 mm. Therefore, it is favorable for wider application by maintaining the compact size of the optical lens assembly. 
     When an axial distance between the outside surface of the first lens element and the inside conjugation surface of the optical lens assembly is TL, and a maximum radius of the optical effective region of the inside conjugation surface of the optical lens assembly is IH, the following condition is satisfied: 1.0&lt;TL/IH&lt;4.0. Therefore, it is favorable for obtaining the balance between the enlargement of the optical effective region of the inside conjugation surface and shortening of the total track length. 
     When the curvature radius of the inside surface of the first lens element is R2, and when the measurement is made in accordance with the reference wavelength as the d-line, the focal length of the optical lens assembly is fd, the following condition is satisfied: 0&lt;R2/fd&lt;2.0. Therefore, it is favorable for obtaining the balance between the field of view and the total track length by adjusting the surface shape of the first lens element and the focal length of the optical lens assembly. 
     When a central thickness of the first lens element is CT1, and an axial distance between the first lens element and the second lens element is T12, the following condition is satisfied: 0.80&lt;CT1/T12&lt;3.5. Therefore, it is favorable for adapting to design of wide field of view by matching the first lens element and the second lens element. 
     When the measurement is made in accordance with the reference wavelength as the d-line, the focal length of the optical lens assembly is fd, and the focal length of the third lens element is fd3, the following condition is satisfied: −2.5&lt;fd/fd3&lt;1.1. Therefore, the refractive power of the third lens element would not be too strong so as to avoid excessive spherical aberrations during reducing the total track length. Preferably, the following condition can be satisfied: 0&lt;fd/fd3&lt;1.1. Thus, it is favorable for decreasing the incident angle or the exiting angle of light on the inside conjugation surface by adjusting the light path through the positive refractive power of the third lens element. 
     The optical lens assembly can further include an aperture stop disposed on an outside of the second lens element. Therefore, it is favorable for obtaining the compactness of the optical lens assembly, and decreasing the incident angle or exiting angle of light on the inside conjugation surface. When an axial distance between the aperture stop and the inside conjugation surface of the optical lens assembly is SL, and an axial distance between the outside surface of the first lens element and the inside conjugation surface of the optical lens assembly is IL, the following condition is satisfied: 0.70&lt;SL/TL&lt;1.1. Therefore, it is favorable for balancing the field of view and size of the optical lens assembly. 
     The optical lens assembly can be applied to the infrared band within a wavelength ranged from 780 nm to 1500 nm so as to decrease the interference from the visible light. Furthermore, the bandwidth of the infrared band can be smaller than 40 nm, so that the sensing precision can be enhanced. 
     When a curvature radius of the inside surface of the fourth lens element is R8, and when the measurement is made in accordance with the reference wavelength as the d-line, the focal length of the optical lens assembly is fd, the following condition is satisfied: 0&lt;R8/fd≤1.75. Therefore, it is favorable for reducing the back focal length by adjusting the surface shape of the fourth lens element and the focal length of the optical lens assembly. 
     The electronic device can include a projection apparatus, which can include the optical lens assembly and at least one light source, wherein the light source can be disposed on the inside conjugation surface of the optical lens assembly. The optical lens assembly of the projection apparatus can project the light from the light source onto the outside conjugation surface. The light from the light source can be within the infrared band (780 nm-1500 nm), the bandwidth of the infrared band can be smaller than 40 nm, and the optical lens assembly of the projection apparatus can be applied to an infrared band. The projection apparatus can include a diffraction element, a focus tunable component or a reflective element (like prism or mirror), wherein it is favorable for projecting the light onto the projection surface evenly by the arrangement of the diffraction element, it is favorable for perfecting the light converging ability by the arrangement of the focus tunable component, and it is favorable for increasing the flexibility of space configuration by the arrangement of the reflective element. 
     The electronic device can include a receiving apparatus, which can include the optical lens assembly and an image sensor, wherein the image sensor is disposed on the inside conjugation surface of the optical lens assembly. Preferably, the optical lens assembly of the receiving apparatus can be applied to an infrared band, wherein the image sensor can be utilized for detecting the light within the infrared band. The receiving apparatus can further include other element with filter function, such as a protecting plate (like glass, metal or plastic material), a filter, etc., or the optical lens assembly can include an element with filter function, such as a filter, a lens element with filter function, etc. 
     The electronic device can include an image capturing apparatus, which can include the optical lens assembly and an image sensor, wherein the image sensor is disposed on the inside conjugation surface of the optical lens assembly. Preferably, the optical lens assembly of the image capturing apparatus can be applied to an infrared band, wherein the image sensor can be utilized for detecting the light within the infrared band. The image capturing apparatus can further include other element with filter function, such as a protecting plate (like glass, metal or plastic material), a filter, etc., or the optical lens assembly can include an element with filter function, such as a filter, a lens element with filter function, etc. 
     The electronic device can include sensing module, which can include the aforementioned projection apparatus or the aforementioned receiving apparatus, or can include both of the aforementioned projection apparatus and the aforementioned receiving apparatus. The optical lens assembly of the projection apparatus can project the light of the light source onto the outside conjugation surface. The optical lens assembly of the receiving apparatus can be utilized for receiving the information on the outside conjugation surface of the optical lens assembly of the projection apparatus, and then imaging on the image sensor thereof. 
     When the measurement is made in accordance with the reference wavelength as the d-line, at least six lens elements of the lens elements of the optical lens assembly of the projection apparatus and the lens elements of the optical lens assembly of the receiving apparatus can have Abbe numbers smaller than 38. Therefore, it is favorable for enhancing the sensing precision and module compactness, especially applying to the infrared band, which can provide better effect. Preferably, at least seven lens elements of the lens elements can have Abbe numbers smaller than 38. More preferably, at least eight lens elements of the lens elements can have Abbe numbers smaller than 38. 
     In the optical lens assembly of each of the projection apparatus and the receiving apparatus, when an axial distance between an outside surface of one of the lens elements closest to the outside and an inside surface of one of the lens elements closest to the inside is TD, the following condition is satisfied: mm&lt;TD&lt;5 mm. Therefore, it is favorable for obtaining the compactness of the sensing module so as to apply to portable devices. 
     A total number of the lens elements in the optical lens assembly of the projection apparatus can be four, so that it is favorable for balancing the projection quality and compactness. A total number of the lens elements in the optical lens assembly of the receiving apparatus can be four, so that it is favorable for balancing the imaging quality and compactness. 
     At least six of the lens elements of the optical lens assembly of the projection apparatus and the lens elements of the optical lens assembly of the receiving apparatus can be made of plastic materials. Therefore, finishing and manufacturing difficulty can be decreased. 
     In each of the aforementioned optical lens assemblies, at least one of the outside surface and the inside surface of one of the lens elements closest to an inside of each optical lens assembly can include at least one critical point. Therefore, it is favorable for correcting off-axis aberrations and reducing the size thereof. 
     The aforementioned light source can be composed by a laser array, which can be formed into a structured light through the optical lens assembly of the projection lens system, and projected on a sensed object. The optical lens assembly of the receiving apparatus can receive the reflective light from the sensed object, imaging on the image sensor, and the received information can be calculated by the processor so as to obtain the relative distance of each portion of the sensed object, further obtain the 3D-shaped variation on the surface of the sensed object. The structured light can utilize the structure, such as dot, spot or stripe, etc., but is not limited thereto. The three-dimensional sensing method can utilize time-of-flight (TOF), structured light or light coding, etc., but is not limited thereto. 
     Furthermore, the aforementioned projection apparatus can include a high directivity (low divergence) and a high intensity light source, wherein the light source can be a laser, SLED, Micro-LED, RCLED, a vertical cavity surface emitting laser (VCSEL), etc., and the light source can be a single light source or multiple light sources disposed on the inside conjugation surface of the optical lens assembly, so as to provide high projection quality. When the light source of the projection apparatus according to the present disclosure is a vertical cavity surface emitting laser and disposed on the inside conjugation surface of the optical lens assembly, it is favorable for providing a high directivity, a low divergence and a high intensity light source by proper light arrangement, so as to increase the illuminance of the outside conjugation surface of the optical lens assembly. 
     According to the electronic device of the present disclosure, the outside refers to outside of mechanism, the inside refers to inside of mechanism. Taking the image capturing apparatus as an example, the inside direction refers to an image-side direction, the inside surface refers to an image-side surface, the outside direction refers to an object-side direction, the outside surface refers to an object-side surface. Taking the projection apparatus as an example, the inside direction is a light source direction, that is, a reduction side, the inside surface is a light incident surface, the outside direction is a projection direction, that is, a magnification side, the outside surface is a light exiting surface. The inside conjugation surface is located on the focus surface inside of the mechanism, that is, the image surface of the image capturing apparatus, and the conjugation surface of the reduction side of the projection apparatus. IH represents the maximum radius of the optical effective region of the inside conjugation surface in the optical lens assembly, that is, the maximum image height of the image capturing apparatus, and the maximum radius of the light source of the projection apparatus. 
     According to the present disclosure, the electronic device can further include but not limited to a control unit, a display, a storage unit, a random access memory unit (RAM) or a combination thereof. 
     In the electronic device of the present disclosure, the optical lens assembly can be applied to the visible light band, or the infrared band. Preferably, the optical lens assembly can be applied to both of the visible light band and the infrared band. 
     According to the optical lens assembly of the present disclosure, the lens elements thereof can be made of glass or plastic materials. When the lens elements are made of glass materials, the distribution of the refractive power of the optical lens assembly may be more flexible to design. When the lens elements are made of plastic materials, manufacturing costs can be effectively reduced. Furthermore, surfaces of each lens element can be arranged to be aspheric, since the aspheric surface of the lens element is easy to form a shape other than a spherical surface so as to have more controllable variables for eliminating aberrations thereof, and to further decrease the required amount of lens elements in the optical lens assembly. Therefore, the total track length of the optical lens assembly can also be reduced. 
     According to the optical lens assembly of the present disclosure, when a lens surface is aspheric, which refers that the lens surface has an aspheric shape throughout its optically effective area, or a portion(s) thereof. 
     According to the optical lens assembly of the present disclosure, each of an outside surface and an inside surface has a paraxial region and an off-axis region. The paraxial region refers to the region of the surface where light rays travel close to an optical axis, and the off-axis region refers to the region of the surface away from the paraxial region. Particularly unless otherwise stated, when the lens element has a convex surface, it indicates that the surface can be convex in the paraxial region thereof; when the lens element has a concave surface, it indicates that the surface can be concave in the paraxial region thereof. According to the optical lens assembly of the present disclosure, the refractive power or the focal length of a lens element being positive or negative may refer to the refractive power or the focal length in a paraxial region of the lens element. 
     According to the optical lens assembly of the present disclosure, the optical lens assembly can include at least one stop, such as an aperture stop, a glare stop or a field stop. Said glare stop or said field stop is for eliminating the stray light and thereby improving the image resolution thereof. 
     According to the optical lens assembly of the present disclosure, the inside conjugation surface of the optical lens assembly, based on the corresponding image sensor or light source, can be flat or curved. In particular, the inside conjugation surface can be a concave curved surface facing towards the outside. According to the optical lens assembly of the present disclosure, at least one correcting element (such as a field flattener) can be selectively disposed between the lens element closest to the inside of the optical lens assembly and the inside conjugation surface so as to correct the image (such as the field curvature). Properties of the correcting element, such as curvature, thickness, refractive index, position, surface shape (convex/concave, spherical/aspheric/diffractive/Fresnel etc.) can be adjusted according to the requirements of the apparatus. In general, the correcting element is preferably a thin plano-concave element having a concave surface toward the outside and disposed close to the inside conjugation surface. 
     According to the optical lens assembly of the present disclosure, an aperture stop can be configured as a front stop or a middle stop. A front stop disposed between an outside conjugation surface and the first lens element can provide a longer distance between an exit pupil of the optical lens assembly and the inside conjugation surface, and thereby obtains a telecentric effect and improves the image-sensing efficiency of the image sensor, such as CCD or CMOS, or improves the projective efficiency. A middle stop disposed between the first lens element and the inside conjugation surface is favorable for enlarging the field of view of the optical lens assembly and thereby provides a wider field of view for the same. 
     According to the optical lens assembly of the present disclosure, a critical point is a non-axial point of the lens surface where its tangent is perpendicular to the optical axis. 
     Each of the aforementioned features of the optical lens assembly can be utilized in various combinations for achieving the corresponding effects. 
     According to the above description of the present disclosure, the following specific embodiments are provided for further explanation. 
     1st Embodiment 
       FIG.  1    is a schematic view of an electronic device according to the 1st embodiment of the present disclosure.  FIG.  2    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 1st embodiment. In  FIG.  1   , the electronic device includes an optical lens assembly (its reference numeral is omitted), wherein the optical lens assembly includes, in order from an outside to an inside, an aperture stop  100 , a first lens element  110 , a second lens element  120 , a third lens element  130 , a fourth lens element  140 , a filter  150  and an inside conjugation surface  160 . The optical lens assembly includes four lens elements ( 110 ,  120 ,  130  and  140 ) without additional one or more lens elements inserted between the first lens element  110  and the fourth lens element  140 . 
     The first lens element  110  with positive refractive power has an outside surface  111  being convex in a paraxial region thereof and an inside surface  112  being concave in a paraxial region thereof. The first lens element  110  is made of a plastic material, and has the outside surface  111  and the inside surface  112  being both aspheric. 
     The second lens element  120  with negative refractive power has an outside surface  121  being concave in a paraxial region thereof and an inside surface  122  being convex in a paraxial region thereof. The second lens element  120  is made of a plastic material, and has the outside surface  121  and the inside surface  122  being both aspheric. 
     The third lens element  130  with positive refractive power has an outside surface  131  being concave in a paraxial region thereof and an inside surface  132  being convex in a paraxial region thereof. The third lens element  130  is made of a plastic material, and has the outside surface  131  and the inside surface  132  being both aspheric. 
     The fourth lens element  140  with negative refractive power has an outside surface  141  being convex in a paraxial region thereof and an inside surface  142  being concave in a paraxial region thereof. The fourth lens element  140  is made of a plastic material, and has the outside surface  141  and the inside surface  142  being both aspheric. Furthermore, each of the outside surface  141  and the inside surface  142  of the fourth lens element  140  includes at least one critical point CP41, CP42 (shown in  FIG.  25   ) in an off-axis region thereof. 
     The filter  150  is made of a glass material and located between the fourth lens element  140  and the inside conjugation surface  160 , and will not affect the focal length of the optical lens assembly. 
     The equation of the aspheric surface profiles of the aforementioned lens elements of the 1st embodiment is expressed as follows: 
                 X   ⁡   (   Y   )     =         (       Y   2     /   R     )     /     (     1   +     sqrt   (     1   -       (     1   +   k     )     ×       (     Y   /   R     )     2         )       )       +       ∑   i         (   Ai   )     ×     (     Y   ′     )             ,         
where,
 
     X is the relative distance between a point on the aspheric surface spaced at a distance Y from the optical axis and the tangential plane at the aspheric surface vertex on the optical axis; 
     Y is the vertical distance from the point on the aspheric surface to the optical axis; 
     R is the curvature radius; 
     k is the conic coefficient; and 
     Ai is the i-th aspheric coefficient. 
     In the optical lens assembly according to the 1st embodiment, when a focal length of the optical lens assembly is f, an f-number of the optical lens assembly is Fno, and half of a maximum field of view of the optical lens assembly is HFOV, these parameters have the following values: f=2.40 mm; Fno=1.48; and HFOV=43.2 degrees. 
     In the optical lens assembly according to the 1st embodiment, when a measurement is made in accordance with a reference wavelength as a d-line (587.6 nm), a refractive index of the first lens element  110  is Nd1, the following condition is satisfied: Nd1=1.614. 
     In the optical lens assembly according to the 1st embodiment, when the measurement is made in accordance with the reference wavelength as the d-line, an Abbe number of the first lens element  110  is Vd1, an Abbe number of the second lens element  120  is Vd2, an Abbe number of the third lens element  130  is Vd3, an Abbe number of the fourth lens element  140  is Vd4, and a sum of the Abbe numbers of the first lens element  110 , the second lens element  120 , the third lens element  130  and the fourth lens element  140  is ΣVd (that is, ΣVd=Vd1+Vd2+Vd3+Vd4), the following conditions are satisfied: Vd1=26.0; Vd1/Vd2=1.27; Vd1/Vd3=1.27; Vd1/Vd4=1.27; Vd2=20.4; Vd3=20.4; Vd4=20.4; and ΣVd=87.2. 
     In the optical lens assembly according to the 1st embodiment, when a central thickness of the first lens element  110  is CT1, and an axial distance between the first lens element  110  and the second lens element  120  is T12, the following condition is satisfied: CT1/T12=1.15. 
     In the optical lens assembly according to the 1st embodiment, when a central thickness of the second lens element  120  is CT2, and a central thickness of the fourth lens element  140  is CT4, the following condition is satisfied: CT2/CT4=0.72. 
     In the optical lens assembly according to the 1st embodiment, when an axial distance between an outside surface of one of the lens elements closest to the outside (that is, the outside surface  111  of the first lens element  110  in the 1st embodiment) and an inside surface of one of the lens elements closest to the inside (that is, the inside surface  142  of the fourth lens element  140  in the 1st embodiment) is TD, the following condition is satisfied: TD=2.26 mm. 
     In the optical lens assembly according to the 1st embodiment, when an axial distance between the outside surface  111  of the first lens element  110  and the inside conjugation surface  160  of the optical lens assembly is TL, and a maximum radius of an optical effective region of the inside conjugation surface  160  of the optical lens assembly is IH, the following condition is satisfied: TL/IH=1.48. 
     In the optical lens assembly according to the 1st embodiment, when a curvature radius of the outside surface  111  of the first lens element  110  is R1, a curvature radius of the inside surface  112  of the first lens element  110  is R2, and a curvature radius of the outside surface  141  of the fourth lens element  140  is R7, the following conditions are satisfied: R1/R2=0.42; and R2/R7=2.24. 
     In the optical lens assembly according to the 1st embodiment, when the curvature radius of the inside surface  112  of the first lens element  110  is R2, and when the measurement is made in accordance with the reference wavelength as the d-line, a focal length of the optical lens assembly is fd, the following condition is satisfied: R2/fd=1.32. 
     In the optical lens assembly according to the 1st embodiment, when a curvature radius of the inside surface  142  of the fourth lens element  140  is R8, and when the measurement is made in accordance with the reference wavelength as the d-line, the focal length of the optical lens assembly is fd, the following condition is satisfied: R8/fd=0.41. 
     In the optical lens assembly according to the 1st embodiment, when the measurement is made in accordance with the reference wavelength as the d-line, the focal length of the optical lens assembly is fd, a focal length of the third lens element  130  is fd3, a focal length of the fourth lens element  140  is fd4, and a maximum of two values of |fd/fd3| and |fd/fd41 is max(|fd/fd3|, |fd/fd4|), the following conditions are satisfied: fd/fd3=0.70; |fd/fd3|+|fd/fd4|=0.98; and max(|fd/fd3|, |fd/fd4|)=0.70. 
     In the optical lens assembly according to the 1st embodiment, when the measurement is made in accordance with the reference wavelength as the d-line, a focal length of the first lens element  110  is fd1, a focal length of the second lens element  120  is fd2, the focal length of the third lens element  130  is fd3, and the focal length of the fourth lens element  140  is fd4, the following condition is satisfied: (|1/fd1|+|1/fd2|)/(|1/fd3|+|1/fd4|)=0.75. 
     In the optical lens assembly according to the 1st embodiment, when an axial distance between the aperture stop  100  and the inside conjugation surface  160  of the optical lens assembly is SL, and an axial distance between the outside surface  111  of the first lens element  110  and the inside conjugation surface  160  of the optical lens assembly is TL, the following condition is satisfied: SL/TL=0.92. 
     The detailed optical data of the 1st embodiment are shown in Tables 1A and 1B, and the aspheric surface data are shown in Table 2 below. 
     
       
         
           
               
             
               
                 TABLE 1A 
               
             
            
               
                   
               
               
                 1st Embodiment 
               
               
                 f = 2.40 mm, Fno = 1.48, HFOV = 43.2 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Outside 
                 Plano 
                 600.000 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
                   
                   
                   
                   
                   
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.281 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 1.274 
                 ASP 
                 0.453 
                 Plastic 
                 1.594 
                 26.0 
                 3.37 
               
               
                 3 
                   
                 3.048 
                 ASP 
                 0.394 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 −16.319 
                 ASP 
                 0.328 
                 Plastic 
                 1.634 
                 20.4 
                 −88.86 
               
               
                 5 
                   
                 −23.157 
                 ASP 
                 0.238 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 −1.035 
                 ASP 
                 0.370 
                 Plastic 
                 1.634 
                 20.4 
                 3.47 
               
               
                 7 
                   
                 −0.801 
                 ASP 
                 0.022 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 1.362 
                 ASP 
                 0.453 
                 Plastic 
                 1.634 
                 20.4 
                 −8.24 
               
               
                 9 
                   
                 0.941 
                 ASP 
                 0.500 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 10 
                 Filter 
                 Plano 
                 0.145 
                 Glass 
                 1.508 
                 64.2 
                 — 
               
               
                 11 
                   
                 Plano 
                 0.492 
                   
                   
                   
                   
               
               
                 12 
                 Inside 
                 Piano 
                 — 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
               
               
                   
               
               
                 Reference wavelength is 940.0 nm 
               
               
                 Effective radius of Surface 5 is 0.850 mm 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 1B 
               
             
            
               
                   
               
               
                 1st Embodiment 
               
               
                 fd = 2.30 mm 
               
            
           
           
               
               
               
               
            
               
                 Surface # 
                   
                 Index 
                 Focal Length 
               
               
                   
               
            
           
           
               
               
               
               
            
               
                 0 
                 Outside conjugation surface 
                   
                   
               
               
                 1 
                 Ape. Stop 
                   
                   
               
               
                 2 
                 Lens 1 
                 1.614 
                 3.25 
               
               
                 3 
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 1.660 
                 −85.36 
               
               
                 5 
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 1.660 
                 3.30 
               
               
                 7 
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 1.660 
                 −8.06 
               
               
                 9 
                   
                   
                   
               
               
                 10 
                 Filter 
                 1.517 
                 — 
               
               
                 11 
                   
                   
                   
               
               
                 12 
                 Inside conjugation surface 
               
               
                   
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 2 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 Surface  
                   
                   
                   
                   
               
               
                 # 
                 2 
                 3 
                 4 
                 5 
               
               
                   
               
               
                  k = 
                 −1.3621E+00 
                  9.8527E+00 
                 −6.2427E+01 
                  1.0348E+01 
               
               
                  A4 = 
                  5.2900E−02 
                 −5.1945E−02 
                 −3.6923E−01 
                 −3.4642E−01 
               
               
                  A6 = 
                  1.9592E−01 
                 −1.8590E−01 
                  7.1742E−01 
                  1.1290E+00 
               
               
                  A8 = 
                 −7.9040E−02 
                  7.7172E−01 
                 −7.1766E+00 
                 −6.3080E+00 
               
               
                 A10 = 
                 −1.4209E+00 
                 −3.5484E+00 
                  3.1299E+01 
                  1.8207E+01 
               
               
                 A12 = 
                  3.3859E+00 
                  6.3995E+00 
                 −8.0080E+01 
                 −2.8507E+01 
               
               
                 A14 = 
                 −2.4674E+00 
                 −6.2229E+00 
                  1.0372E+02 
                  2.1970E+01 
               
               
                 A16 = 
                   
                  2.3645E+00 
                 −5.0614E+01 
                 −5.7753E+00 
               
               
                   
               
               
                 Surface 
                   
                   
                   
                   
               
               
                 # 
                 6 
                 7 
                 8 
                 9 
               
               
                   
               
               
                  k = 
                  1.8953E−01 
                 −7.3447E+00 
                 −6.8788E−01 
                 −4.8628E+00 
               
               
                  A4 = 
                  2.3972E−01 
                 −1.4078E+00 
                 −5.5202E−01 
                 −2.6074E−01 
               
               
                  A6 = 
                  6.0228E−01 
                  5.0381E+00 
                  5.5329E−01 
                  2.6091E−01 
               
               
                  A8 = 
                 −7.3869E+00 
                 −1.4183E+01 
                 −4.2818E−01 
                 −1.9719E−01 
               
               
                 A10 = 
                  2.7483E+01 
                  2.5531E+01 
                  2.1197E−01 
                  9.3754E−02 
               
               
                 A12 = 
                 −4.4540E+01 
                 −2.5622E+01 
                 −6.1912E−02 
                 −2.7309E−02 
               
               
                 A14 = 
                  3.3950E+01 
                  1.3254E+01 
                  9.7621E−03 
                  4.4423E−03 
               
               
                 A16 = 
                 −9.7250E+00 
                 −2.7856E+00 
                 −6.4485E−04 
                 −3.0510E−04 
               
               
                   
               
            
           
         
       
     
     In Table 1A, the detailed optical data of the 1st embodiment in  FIG.  1    are stated, and in Table 1B, the refractive indices and the focal lengths of the 1st embodiment in  FIG.  1    when the measurement is made in accordance with the reference wavelength as the d-line are stated, wherein the curvature radii, the thicknesses and the focal lengths are shown in millimeters (mm). Surface numbers 0-12 represent the surfaces sequentially arranged from the outside to the inside along the optical axis. In Table 2, k represents the conic coefficient of the equation of the aspheric surface profiles. A4-A16 represent the aspheric coefficients ranging from the 4th order to the 16th order. The tables presented below for each embodiment correspond to schematic parameter and aberration curves of each embodiment, and term definitions of the tables are the same as those in Table 1A, Table 1B and Table 2 of the 1st embodiment. Therefore, an explanation in this regard will not be provided again. 
     2nd Embodiment 
       FIG.  3    is a schematic view of an electronic device according to the 2nd embodiment of the present disclosure.  FIG.  4    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 2nd embodiment. In  FIG.  3   , the electronic device includes an optical lens assembly (its reference numeral is omitted), wherein the optical lens assembly includes, in order from an outside to an inside, a first lens element  210 , an aperture stop  200 , a second lens element  220 , a third lens element  230 , a fourth lens element  240  and an inside conjugation surface  260 . The optical lens assembly includes four lens elements ( 210 ,  220 ,  230  and  240 ) without additional one or more lens elements inserted between the first lens element  210  and the fourth lens element  240 . 
     The first lens element  210  with positive refractive power has an outside surface  211  being convex in a paraxial region thereof and an inside surface  212  being concave in a paraxial region thereof. The first lens element  210  is made of a plastic material, and has the outside surface  211  and the inside surface  212  being both aspheric. 
     The second lens element  220  with positive refractive power has an outside surface  221  being concave in a paraxial region thereof and an inside surface  222  being convex in a paraxial region thereof. The second lens element  220  is made of a plastic material, and has the outside surface  221  and the inside surface  222  being both aspheric. 
     The third lens element  230  with positive refractive power has an outside surface  231  being concave in a paraxial region thereof and an inside surface  232  being convex in a paraxial region thereof. The third lens element  230  is made of a plastic material, and has the outside surface  231  and the inside surface  232  being both aspheric. 
     The fourth lens element  240  with negative refractive power has an outside surface  241  being convex in a paraxial region thereof and an inside surface  242  being concave in a paraxial region thereof. The fourth lens element  240  is made of a plastic material, and has the outside surface  241  and the inside surface  242  being both aspheric. Furthermore, each of the outside surface  241  and the inside surface  242  of the fourth lens element  240  includes at least one critical point in an off-axis region thereof. 
     The detailed optical data of the 2nd embodiment are shown in Tables 3A and 3B, and the aspheric surface data are shown in Table 4 below. 
     
       
         
           
               
             
               
                 TABLE 3A 
               
             
            
               
                   
               
               
                 2nd Embodiment 
               
               
                 f = 1.63 mm, Fno = 1.65, HFOV = 45.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Outside 
                 Plano 
                 400.000 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 1 
                 Lens 1 
                 1.237 
                 ASP 
                 0.336 
                 Plastic 
                 1.634 
                 20.4 
                 22.17 
               
               
                 2 
                   
                 1.213 
                 ASP 
                 0.187 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 3 
                 Ape. Stop 
                 Plano 
                 0.047 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 4 
                 Lens 2 
                 −3.277 
                 ASP 
                 0.423 
                 Plastic 
                 1.634 
                 20.4 
                 2.24 
               
               
                 5 
                   
                 −1.041 
                 ASP 
                 0.642 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 −0.760 
                 ASP 
                 0.637 
                 Plastic 
                 1.634 
                 20.4 
                 1.67 
               
               
                 7 
                   
                 −0.586 
                 ASP 
                 0.030 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 1.806 
                 ASP 
                 0.629 
                 Plastic 
                 1.634 
                 20.4 
                 −3.21 
               
               
                 9 
                   
                 0.828 
                 ASP 
                 0.558 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 10 
                 Inside 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
               
               
                   
               
               
                 Reference wavelength is 940.0 nm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 3B 
               
             
            
               
                   
               
               
                 2nd Embodiment 
               
               
                 fd = 1.56 mm 
               
            
           
           
               
               
               
               
            
               
                 Surface # 
                   
                 Index 
                 Focal Length 
               
               
                   
               
            
           
           
               
               
               
               
            
               
                 0 
                 Outside conjugation surface 
                   
                   
               
               
                 1 
                 Lens 1 
                 1.660 
                 20.66 
               
               
                 2 
                   
                   
                   
               
               
                 3 
                 Ape. Stop 
                   
                   
               
               
                 4 
                 Lens 2 
                 1.660 
                 2.15 
               
               
                 5 
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 1.660 
                 1.58 
               
               
                 7 
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 1.660 
                 −3.11 
               
               
                 9 
                   
                   
                   
               
               
                 10 
                 Inside conjugation surface 
               
               
                   
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 4 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 Surface # 
                 1 
                 2 
                 4 
                 5 
               
               
                   
               
               
                  k = 
                  4.6933E−01 
                 −1.6476E−F01 
                  3.2263E+00 
                 −3.7036E+01 
               
               
                  A4 = 
                  1.4648E−01 
                  1.4757E+00 
                 −1.0680E−01 
                 −3.1352E+00 
               
               
                  A6 = 
                  6.8742E−01 
                  8.1862E−01 
                 −3.3913E+00 
                  1.9765E+01 
               
               
                  A8 = 
                 −1.6208E+00 
                 −1.3581E+01 
                  3.1887E+01 
                 −9.7012E+01 
               
               
                 A10 = 
                  3.2284E+00 
                  6.8848E+01 
                 −1.6057E+02 
                  2.6450E+02 
               
               
                 A12 = 
                   
                   
                  2.6228E+02 
                 −3.6576E+02 
               
               
                 A14 = 
                   
                   
                   
                  1.5985E+02 
               
               
                   
               
               
                 Surface # 
                 6 
                 7 
                 8 
                 9 
               
               
                   
               
               
                  k = 
                 −7.4296E−01 
                 −1.1011E+00 
                 −1.6752E+00 
                 −8.4235E+00 
               
               
                  A4 = 
                 −2.7963E−02 
                  2.8536E−01 
                  1.4233E−02 
                 −2.8891E−02 
               
               
                  A6 = 
                 −9.8170E−01 
                 −1.0091E+00 
                 −1.1356E−01 
                 −6.2469E−02 
               
               
                  A8 = 
                  4.3964E+00 
                  1.3120E+00 
                  1.1321E−01 
                  6.7605E−02 
               
               
                 A10 = 
                 −1.3214E+01 
                 −8.3178E−01 
                 −6.1698E−02 
                 −4.5801E−02 
               
               
                 A12 = 
                  1.8931E+01 
                 −3.4680E−01 
                  1.5626E−02 
                  1.9327E−02 
               
               
                 A14 = 
                 −8.6942E+00 
                  5.7728E−01 
                 −1.4251E−03 
                 −4.5935E−03 
               
               
                 A16 = 
                   
                   
                   
                  4.5328E−04 
               
               
                   
               
            
           
         
       
     
     In the 2nd embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 2nd embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 3A, Table 3B and Table 4 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 2nd Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                   
                 f [mm] 
                 1.63 
                 CT2/CT4 
                 0.67 
               
               
                   
                 Fno 
                 1.65 
                 TD [mm] 
                 2.93 
               
               
                   
                 HFOV [deg.] 
                 45.0 
                 TL/IH 
                 1.97 
               
               
                   
                 Nd1 
                 1.660 
                 R1/R2 
                 1.02 
               
               
                   
                 Vd1 
                 20.4 
                 R2/R7 
                 0.67 
               
               
                   
                 Vd1Nd2 
                 1.00 
                 R2/fd 
                 0.78 
               
               
                   
                 Vd1/Vd3 
                 1.00 
                 R8/fd 
                 0.53 
               
               
                   
                 Vd1Nd4 
                 1.00 
                 fd/fd3 
                 0.99 
               
               
                   
                 Vd2 
                 20.4 
                 |fd/fd3| + |fd/fd4| 
                 1.49 
               
               
                   
                 Vd3 
                 20.4 
                 max (|fd/fd3|, |fd/fd4|) 
                 0.99 
               
               
                   
                 Vd4 
                 20.4 
                 (|1/fd1| + |1/fd2|)/ 
                 0.54 
               
               
                   
                   
                   
                 (|1/fd3| + |1/fd4|) 
                   
               
               
                   
                 ΣVd 
                 81.6 
                 SL/TL 
                 0.85 
               
               
                   
                 CT1/T12 
                 1.44 
               
               
                   
                   
               
            
           
         
       
     
     3rd Embodiment 
       FIG.  5    is a schematic view of an electronic device according to the 3rd embodiment of the present disclosure.  FIG.  6    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 3rd embodiment. In  FIG.  5   , the electronic device includes an optical lens assembly (its reference numeral is omitted), wherein the optical lens assembly includes, in order from an outside to an inside, a first lens element  310 , an aperture stop  300 , a second lens element  320 , a third lens element  330 , a fourth lens element  340  and an inside conjugation surface  360 . The optical lens assembly includes four lens elements ( 310 ,  320 ,  330  and  340 ) without additional one or more lens elements inserted between the first lens element  310  and the fourth lens element  340 . 
     The first lens element  310  with positive refractive power has an outside surface  311  being convex in a paraxial region thereof and an inside surface  312  being concave in a paraxial region thereof. The first lens element  310  is made of a plastic material, and has the outside surface  311  and the inside surface  312  being both aspheric. 
     The second lens element  320  with positive refractive power has an outside surface  321  being concave in a paraxial region thereof and an inside surface  322  being convex in a paraxial region thereof. The second lens element  320  is made of a plastic material, and has the outside surface  321  and the inside surface  322  being both aspheric. 
     The third lens element  330  with positive refractive power has an outside surface  331  being concave in a paraxial region thereof and an inside surface  332  being convex in a paraxial region thereof. The third lens element  330  is made of a plastic material, and has the outside surface  331  and the inside surface  332  being both aspheric. 
     The fourth lens element  340  with negative refractive power has an outside surface  341  being convex in a paraxial region thereof and an inside surface  342  being concave in a paraxial region thereof. The fourth lens element  340  is made of a plastic material, and has the outside surface  341  and the inside surface  342  being both aspheric. Furthermore, each of the outside surface  341  and the inside surface  342  of the fourth lens element  340  includes at least one critical point in an off-axis region thereof. 
     The detailed optical data of the 3rd embodiment are shown in Tables 5A and 5B, and the aspheric surface data are shown in Table 6 below. 
     
       
         
           
               
             
               
                 TABLE 5A 
               
             
            
               
                   
               
               
                 3rd Embodiment 
               
               
                 f = 1.62 mm, Fno = 1.65, HFOV = 45.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Outside 
                 Plano 
                 400.000 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 1 
                 Lens 1 
                 1.093 
                 ASP 
                 0.341 
                 Plastic 
                 1.634 
                 20.4 
                 14.75 
               
               
                 2 
                   
                 1.087 
                 ASP 
                 0.177 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 3 
                 Ape. Stop 
                 Plano 
                 0.050 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 4 
                 Lens 2 
                 −2.588 
                 ASP 
                 0.401 
                 Plastic 
                 1.634 
                 20.4 
                 2.63 
               
               
                 5 
                   
                 −1.074 
                 ASP 
                 0.711 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 −0.806 
                 ASP 
                 0.581 
                 Plastic 
                 1.634 
                 20.4 
                 2.05 
               
               
                 7 
                   
                 −0.637 
                 ASP 
                 0.030 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 1.619 
                 ASP 
                 0.649 
                 Plastic 
                 1.634 
                 20.4 
                 −10.20 
               
               
                 9 
                   
                 1.093 
                 ASP 
                 0.549 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 10 
                 Inside 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
                   
                   
                   
                   
                   
                   
               
               
                   
               
               
                 Reference wavelength is 940.0 nm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 5B 
               
             
            
               
                   
               
               
                 3rd Embodiment 
               
               
                 fd = 1.56 mm 
               
            
           
           
               
               
               
               
               
            
               
                   
                 Surface # 
                   
                 Index 
                 Focal Length 
               
               
                   
                   
               
               
                   
                  0 
                 Outside conjugation surface 
                   
                   
               
               
                   
                  1 
                 Lens 1 
                 1.660 
                 13.80 
               
               
                   
                  2 
                   
                   
                   
               
               
                   
                  3 
                 Ape. Stop 
                   
                   
               
               
                   
                  4 
                 Lens 2 
                 1.660 
                  2.52 
               
               
                   
                  5 
                   
                   
                   
               
               
                   
                  6 
                 Lens 3 
                 1.660 
                  1.94 
               
               
                   
                  7 
                   
                   
                   
               
               
                   
                  8 
                 Lens 4 
                 1.660 
                 −10.03  
               
               
                   
                  9 
                   
                   
                   
               
               
                   
                 10 
                 Inside conjugation surface 
               
               
                   
                   
               
               
                   
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 6 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 Surface # 
                 1 
                 2 
                 4 
                 5 
               
               
                   
               
               
                 k = 
                 −1.0215E−01  
                 −1.6051E+01  
                 6.9732E+00 
                 −3.4932E+01  
               
               
                 A4 = 
                 1.9975E−01 
                 2.0097E+00 
                 −3.8666E−02  
                 −2.9353E+00  
               
               
                 A6 = 
                 4.0285E−01 
                 −5.0791E+00  
                 −4.3589E+00  
                 2.0386E+01 
               
               
                 A8 = 
                 −5.3972E−01  
                 1.9253E+01 
                 4.8798E+01 
                 −1.1270E+02  
               
               
                 A10 = 
                 2.0449E+00 
                 −9.2315E+00  
                 −2.6927E+02  
                 3.7089E+02 
               
               
                 A12 = 
                   
                   
                 5.2560E+02 
                 −6.6034E+02  
               
               
                 A14 = 
                   
                   
                   
                 4.6252E+02 
               
               
                   
               
               
                 Surface # 
                 6 
                 7 
                 8 
                 9 
               
               
                   
               
               
                 k = 
                 −5.1586E−01  
                 −1.0198E+00  
                 −1.2692E+00  
                 −6.9369E+00  
               
               
                 A4 = 
                 −7.8159E−02  
                 8.9721E−02 
                 1.1532E−02 
                 −1.7541E−03  
               
               
                 A6 = 
                 9.6612E−01 
                 −4.3741E−01  
                 −1.5648E−01  
                 −5.9643E−02  
               
               
                 A8 = 
                 −3.9972E+00  
                 7.0880E−01 
                 1.4892E−01 
                 −1.4983E−02  
               
               
                 A10 = 
                 8.4049E+00 
                 −1.0647E+00  
                 −7.0741E−02  
                 4.8039E−02 
               
               
                 A12 = 
                 −7.9789E+00  
                 7.9482E−01 
                 1.6068E−02 
                 −2.5006E−02  
               
               
                 A14 = 
                 2.9939E+00 
                 −1.5188E−01  
                 −1.3678E−03  
                 5.2310E−03 
               
               
                 A16 = 
                   
                   
                   
                 −3.8834E−04  
               
               
                   
               
            
           
         
       
     
     In the 3rd embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 3rd embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 5A, Table 5B and Table 6 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 3rd Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                   
                 f [mm] 
                 1.62 
                 CT2/CT4 
                 0.62 
               
               
                   
                 Fno 
                 1.65 
                 TD [mm] 
                 2.94 
               
               
                   
                 HFOV [deg.] 
                 45.0 
                 TL/IH 
                 1.97 
               
               
                   
                 Nd1 
                 1.660 
                 R1/R2 
                 1.00 
               
               
                   
                 Vd1 
                 20.4 
                 R2/R7 
                 0.67 
               
               
                   
                 Vd1Nd2 
                 1.00 
                 R2/fd 
                 0.70 
               
               
                   
                 Vd1/Vd3 
                 1.00 
                 R8/fd 
                 0.70 
               
               
                   
                 Vd1Nd4 
                 1.00 
                 fd/fd3 
                 0.80 
               
               
                   
                 Vd2 
                 20.4 
                 |fd/fd3| + |fd/fd4| 
                 0.96 
               
               
                   
                 Vd3 
                 20.4 
                 max (|fd/fd3|, |fd/fd4|) 
                 0.80 
               
               
                   
                 Vd4 
                 20.4 
                 (|1/fd1| + |1/fd2|)/ 
                 0.76 
               
               
                   
                   
                   
                 (|1/fd3| + |1/fd4|) 
                   
               
               
                   
                 ΣVd 
                 81.6 
                 SL/TL 
                 0.85 
               
               
                   
                 CT1/T12 
                 1.50 
               
               
                   
                   
               
            
           
         
       
     
     4th Embodiment 
       FIG.  7    is a schematic view of an electronic device according to the 4th embodiment of the present disclosure.  FIG.  8    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 4th embodiment. In  FIG.  7   , the electronic device includes an optical lens assembly (its reference numeral is omitted), wherein the optical lens assembly includes, in order from an outside to an inside, a first lens element  410 , an aperture stop  400 , a second lens element  420 , a third lens element  430 , a fourth lens element  440  and an inside conjugation surface  460 . The optical lens assembly includes four lens elements ( 410 ,  420 ,  430  and  440 ) without additional one or more lens elements inserted between the first lens element  410  and the fourth lens element  440 . 
     The first lens element  410  with negative refractive power has an outside surface  411  being convex in a paraxial region thereof and an inside surface  412  being concave in a paraxial region thereof. The first lens element  410  is made of a plastic material, and has the outside surface  411  and the inside surface  412  being both aspheric. 
     The second lens element  420  with positive refractive power has an outside surface  421  being concave in a paraxial region thereof and an inside surface  422  being convex in a paraxial region thereof. The second lens element  420  is made of a plastic material, and has the outside surface  421  and the inside surface  422  being both aspheric. 
     The third lens element  430  with positive refractive power has an outside surface  431  being concave in a paraxial region thereof and an inside surface  432  being convex in a paraxial region thereof. The third lens element  430  is made of a plastic material, and has the outside surface  431  and the inside surface  432  being both aspheric. 
     The fourth lens element  440  with negative refractive power has an outside surface  441  being convex in a paraxial region thereof and an inside surface  442  being concave in a paraxial region thereof. The fourth lens element  440  is made of a plastic material, and has the outside surface  441  and the inside surface  442  being both aspheric. Furthermore, each of the outside surface  441  and the inside surface  442  of the fourth lens element  440  includes at least one critical point in an off-axis region thereof. 
     The detailed optical data of the 4th embodiment are shown in Tables 7A and 7B, and the aspheric surface data are shown in Table 8 below. 
     
       
         
           
               
             
               
                 TABLE 7A 
               
             
            
               
                   
               
               
                 4th Embodiment 
               
               
                 f = 1.59 mm, Fno = 1.61, HFOV = 45.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Outside 
                 Plano 
                   
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                 400.000 
                   
                   
                   
                   
               
               
                   
                 surface 
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 1 
                 Lens 1 
                 1.242 
                 ASP 
                 0.365 
                 Plastic 
                 1.641 
                 19.5 
                 −79.04 
               
               
                 2 
                   
                 1.073 
                 ASP 
                 0.207 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 3 
                 Ape. Stop 
                 Plano 
                 0.053 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 4 
                 Lens 2 
                 −2.958 
                 ASP 
                 0.397 
                 Plastic 
                 1.641 
                 19.5 
                 2.31 
               
               
                 5 
                   
                 −1.040 
                 ASP 
                 0.772 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 −0.813 
                 ASP 
                 0.531 
                 Plastic 
                 1.641 
                 19.5 
                 1.84 
               
               
                 7 
                   
                 −0.604 
                 ASP 
                 0.010 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 1.278 
                 ASP 
                 0.555 
                 Plastic 
                 1.641 
                 19.5 
                 −4.86 
               
               
                 9 
                   
                 0.753 
                 ASP 
                 0.600 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 10 
                 Inside 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
               
               
                   
               
               
                 Reference wavelength is 940.0 nm. 
               
               
                 Effective radius of Surface 5 is 0.585 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 7B 
               
             
            
               
                   
               
               
                 4th Embodiment 
               
               
                 fd = 1.52 mm 
               
            
           
           
               
               
               
               
               
            
               
                   
                 Surface # 
                   
                 Index 
                 Focal Length 
               
               
                   
                   
               
               
                   
                  0 
                 Outside conjugation surface 
                   
                   
               
               
                   
                  1 
                 Lens 1 
                 1.669 
                 −88.21  
               
               
                   
                  2 
                   
                   
                   
               
               
                   
                  3 
                 Ape. Stop 
                   
                   
               
               
                   
                  4 
                 Lens 2 
                 1.669 
                  2.21 
               
               
                   
                  5 
                   
                   
                   
               
               
                   
                  6 
                 Lens 3 
                 1.669 
                  1.74 
               
               
                   
                  7 
                   
                   
                   
               
               
                   
                  8 
                 Lens 4 
                 1.669 
                 −4.75 
               
               
                   
                  9 
                   
                   
                   
               
               
                   
                 10 
                 Inside conjugation surface 
               
               
                   
                   
               
               
                   
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 8 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 Surface # 
                 1 
                 2 
                 4 
                 5 
               
               
                   
               
               
                 k = 
                 −6.0399E−01  
                 −5.0265E+00  
                 1.2585E+01 
                 −1.2856E+01  
               
               
                 A4 = 
                 2.4218E−01 
                 1.0636E+00 
                 −1.5753E−01  
                 −1.4941E+00  
               
               
                 A6 = 
                 3.6557E−01 
                 2.2335E+00 
                 −1.9142E+00  
                 2.9042E+00 
               
               
                 A8 = 
                 −4.3131E−01  
                 −1.1485E+01  
                 1.6396E+01 
                 2.7618E+00 
               
               
                 A10 = 
                 1.2690E+00 
                 5.6090E+01 
                 −9.1465E+01  
                 −8.8844E+01  
               
               
                 A12 = 
                   
                   
                 1.3354E+02 
                 3.2034E+02 
               
               
                 A14 = 
                   
                   
                   
                 −4.1379E+02  
               
               
                   
               
               
                 Surface # 
                 6 
                 7 
                 8 
                 9 
               
               
                   
               
               
                 k = 
                 −5.4814E−01  
                 −1.1315E+00  
                 −1.8645E+00  
                 −6.8699E+00  
               
               
                 A4 = 
                 2.2866E−01 
                 3.0196E−01 
                 −4.8631E−02  
                 4.3969E−02 
               
               
                 A6 = 
                 −3.2073E−01  
                 −1.2726E+00  
                 −7.5137E−02  
                 −2.0916E−01  
               
               
                 A8 = 
                 −8.2726E−01  
                 2.6891E+00 
                 9.5695E−02 
                 2.0274E−01 
               
               
                 A10 = 
                 2.5898E+00 
                 −4.1102E+00  
                 −5.1304E−02  
                 −1.1586E−01  
               
               
                 A12 = 
                 −2.0211E+00  
                 3.3323E+00  
                 1.2120E−02 
                 4.1039E−02 
               
               
                 A14 = 
                 6.6296E−01 
                 −9.5129E−01  
                 −1.0040E−03  
                 −8.4306E−03  
               
               
                 A16 = 
                   
                   
                   
                 7.5589E−04 
               
               
                   
               
            
           
         
       
     
     In the 4th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 4th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 7A, Table 7B and Table 8 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 4th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                   
                 f [mm] 
                 1.59 
                 CT2/CT4 
                 0.72 
               
               
                   
                 Fno 
                 1.61 
                 TD [mm] 
                 2.89 
               
               
                   
                 HFOV [deg.] 
                 45.0 
                 TL/IH 
                 1.99 
               
               
                   
                 Nd1 
                 1.669 
                 R1/R2 
                 1.16 
               
               
                   
                 Vd1 
                 19.5 
                 R2/R7 
                 0.84 
               
               
                   
                 Vd1Nd2 
                 1.00 
                 R2/fd 
                 0.71 
               
               
                   
                 Vd1/Vd3 
                 1.00 
                 R8/fd 
                 0.50 
               
               
                   
                 Vd1Nd4 
                 1.00 
                 fd/fd3 
                 0.87 
               
               
                   
                 Vd2 
                 19.5 
                 |fd/fd3| + |fd/fd4| 
                 1.19 
               
               
                   
                 Vd3 
                 19.5 
                 max (|fd/fd3|, |fd/fd4|) 
                 0.87 
               
               
                   
                 Vd4 
                 19.5 
                 (|1/fd1| + |1/fd2|)/ 
                 0.59 
               
               
                   
                   
                   
                 (|1/fd3| + |1/fd4|) 
                   
               
               
                   
                 ΣVd 
                 77.8 
                 SL/TL 
                 0.84 
               
               
                   
                 CT1/T12 
                 1.40 
               
               
                   
                   
               
            
           
         
       
     
     5th Embodiment 
       FIG.  9    is a schematic view of an electronic device according to the 5th embodiment of the present disclosure.  FIG.  10    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 5th embodiment. In  FIG.  9   , the electronic device includes an optical lens assembly (its reference numeral is omitted), wherein the optical lens assembly includes, in order from an outside to an inside, a first lens element  510 , an aperture stop  500 , a second lens element  520 , a third lens element  530 , a fourth lens element  540 , a filter  550  and an inside conjugation surface  560 . The optical lens assembly includes four lens elements ( 510 ,  520 ,  530  and  540 ) without additional one or more lens elements inserted between the first lens element  510  and the fourth lens element  540 . 
     The first lens element  510  with positive refractive power has an outside surface  511  being convex in a paraxial region thereof and an inside surface  512  being concave in a paraxial region thereof. The first lens element  510  is made of a plastic material, and has the outside surface  511  and the inside surface  512  being both aspheric. 
     The second lens element  520  with positive refractive power has an outside surface  521  being concave in a paraxial region thereof and an inside surface  522  being convex in a paraxial region thereof. The second lens element  520  is made of a plastic material, and has the outside surface  521  and the inside surface  522  being both aspheric. 
     The third lens element  530  with positive refractive power has an outside surface  531  being concave in a paraxial region thereof and an inside surface  532  being convex in a paraxial region thereof. The third lens element  530  is made of a plastic material, and has the outside surface  531  and the inside surface  532  being both aspheric. 
     The fourth lens element  540  with positive refractive power has an outside surface  541  being convex in a paraxial region thereof and an inside surface  542  being concave in a paraxial region thereof. The fourth lens element  540  is made of a plastic material, and has the outside surface  541  and the inside surface  542  being both aspheric. Furthermore, each of the outside surface  541  and the inside surface  542  of the fourth lens element  540  includes at least one critical point in an off-axis region thereof. 
     The filter  550  is made of a glass material and located between the fourth lens element  540  and the inside conjugation surface  560 , and will not affect the focal length of the optical lens assembly. 
     The detailed optical data of the 5th embodiment are shown in Tables 9A and 9B, and the aspheric surface data are shown in Table 10 below. 
     
       
         
           
               
             
               
                 TABLE 9A 
               
             
            
               
                   
               
               
                 5th Embodiment 
               
               
                 f = 1.67 mm, Fno = 1.58, HFOV = 45.2 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Outside 
                 Plano 
                 400.000 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 1 
                 Lens 1 
                 0.972 
                 ASP 
                 0.271 
                 Plastic 
                 1.641 
                 19.5 
                 9.29 
               
               
                 2 
                   
                 1.035 
                 ASP 
                 0.189 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 3 
                 Ape. Stop 
                 Plano 
                 0.074 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 4 
                 Lens 2 
                 −2.109 
                 ASP 
                 0.377 
                 Plastic 
                 1.641 
                 19.5 
                 2.71 
               
               
                 5 
                   
                 −1.020 
                 ASP 
                 0.821 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 −0.801 
                 ASP 
                 0.597 
                 Plastic 
                 1.641 
                 19.5 
                 2.63 
               
               
                 7 
                   
                 −0.701 
                 ASP 
                 0.010 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 1.442 
                 ASP 
                 0.557 
                 Plastic 
                 1.641 
                 19.5 
                 14.42 
               
               
                 9 
                   
                 1.450 
                 ASP 
                 0.350 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 10 
                 Filter 
                 Plano 
                 0.100 
                 Glass 
                 1.508 
                 64.2 
                 — 
               
               
                 11 
                   
                 Plano 
                 0.143 
                   
                   
                   
                   
               
               
                 12 
                 Inside 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
               
               
                   
               
               
                 Reference wavelength is 940.0 nm. 
               
               
                 Effective radius of Surface 5 is 0.630 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 9B 
               
             
            
               
                   
               
               
                 5th Embodiment 
               
               
                 fd = 1.62 mm 
               
            
           
           
               
               
               
               
               
            
               
                   
                 Surface # 
                   
                 Index 
                 Focal Length 
               
               
                   
                   
               
               
                   
                  0 
                 Outside conjugation surface 
                   
                   
               
               
                   
                  1 
                 Lens 1 
                 1.669 
                  8.76 
               
               
                   
                  2 
                   
                   
                   
               
               
                   
                  3 
                 Ape. Stop 
                   
                   
               
               
                   
                  4 
                 Lens 2 
                 1.669 
                  2.59 
               
               
                   
                  5 
                   
                   
                   
               
               
                   
                  6 
                 Lens 3 
                 1.669 
                  2.47 
               
               
                   
                  7 
                   
                   
                   
               
               
                   
                  8 
                 Lens 4 
                 1.669 
                 13.48 
               
               
                   
                  9 
                   
                   
                   
               
               
                   
                 10 
                 Filter 
                 1.517 
                 — 
               
               
                   
                 11 
                   
                   
                   
               
               
                   
                 12 
                 Inside conjugation surface 
               
               
                   
                   
               
               
                   
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 10 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 Surface # 
                 1 
                 2 
                 4 
                 5 
               
               
                   
               
               
                 k = 
                 5.8634E−01 
                 −4.1733E+00  
                 7.8306E+00 
                 −1.8060E+01  
               
               
                 A4 = 
                 1.2889E−01 
                 9.3735E−01 
                 −1.7415E−01  
                 −1.9324E+00  
               
               
                 A6 = 
                 1.1116E−01 
                 1.4462E−01 
                 −1.1159E+00  
                 8.2476E+00 
               
               
                 A8 = 
                 3.2883E−02 
                 1.0082E+00 
                 1.0336E+01 
                 −3.1133E+01  
               
               
                 A10 = 
                 1.7659E+00 
                 1.4161E+01 
                 −5.1790E+01  
                 6.4831E+01 
               
               
                 A12 = 
                   
                   
                 8.1969E+01 
                 −5.7203E+01  
               
               
                 A14 = 
                   
                   
                   
                 −9.9270E+00  
               
               
                   
               
               
                 Surface # 
                 6 
                 7 
                 8 
                 9 
               
               
                   
               
               
                 k = 
                 −5.1704E−01  
                 −9.5378E−01  
                 −1.3946E+00  
                 −3.6371E+00  
               
               
                 A4 = 
                 −7.8171E−02  
                 −3.8642E−03  
                 6.7368E−02 
                 1.7683E−01 
               
               
                 A6 = 
                 8.6137E−01 
                 −1.7672E−01  
                 −2.9215E−01  
                 −4.9344E−01  
               
               
                 A8 = 
                 −2.9824E+00  
                 2.0628E−01 
                 2.6041E−01 
                 4.4014E−01 
               
               
                 A10 = 
                 5.2777E+00 
                 −2.5365E−01  
                 −1.1197E−01  
                 −2.1173E−01  
               
               
                 A12 = 
                 −3.9481E+00  
                 1.1391E−01 
                 2.2991E−02 
                 5.8806E−02 
               
               
                 A14 = 
                 1.1316E+00 
                 3.0979E−02 
                 −1.7837E−03  
                 −9.1865E−03  
               
               
                 A16 = 
                   
                   
                   
                 6.4250E−04 
               
               
                   
               
            
           
         
       
     
     In the 5th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 5th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 9A, Table 9B and Table 10 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 5th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                   
                 f [mm] 
                 1.67 
                 CT2/CT4 
                 0.68 
               
               
                   
                 Fno 
                 1.58 
                 TD [mm] 
                 2.90 
               
               
                   
                 HFOV [deg.] 
                 45.2 
                 TL/IH 
                 1.92 
               
               
                   
                 Nd1 
                 1.669 
                 R1/R2 
                 0.94 
               
               
                   
                 Vd1 
                 19.5 
                 R2/R7 
                 0.72 
               
               
                   
                 Vd1Nd2 
                 1.00 
                 R2/fd 
                 0.64 
               
               
                   
                 Vd1/Vd3 
                 1.00 
                 R8/fd 
                 0.90 
               
               
                   
                 Vd1Nd4 
                 1.00 
                 fd/fd3 
                 0.65 
               
               
                   
                 Vd2 
                 19.5 
                 |fd/fd3| + |fd/fd4| 
                 0.77 
               
               
                   
                 Vd3 
                 19.5 
                 max (|fd/fd3|, |fd/fd4|) 
                 0.65 
               
               
                   
                 Vd4 
                 19.5 
                 (|1/fd1| + |1/fd2|)/ 
                 1.05 
               
               
                   
                   
                   
                 (|1/fd3| + |1/fd4|) 
                   
               
               
                   
                 ΣVd 
                 77.8 
                 SL/TL 
                 0.87 
               
               
                   
                 CT1/T12 
                 1.03 
               
               
                   
                   
               
            
           
         
       
     
     6th Embodiment 
       FIG.  11    is a schematic view of an electronic device according to the 6th embodiment of the present disclosure.  FIG.  12    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 6th embodiment. In  FIG.  11   , the electronic device includes an optical lens assembly (its reference numeral is omitted), wherein the optical lens assembly includes, in order from an outside to an inside, a first lens element  610 , an aperture stop  600 , a second lens element  620 , a third lens element  630 , a fourth lens element  640 , a filter  650  and an inside conjugation surface  660 . The optical lens assembly includes four lens elements ( 610 ,  620 ,  630  and  640 ) without additional one or more lens elements inserted between the first lens element  610  and the fourth lens element  640 . 
     The first lens element  610  with positive refractive power has an outside surface  611  being convex in a paraxial region thereof and an inside surface  612  being concave in a paraxial region thereof. The first lens element  610  is made of a plastic material, and has the outside surface  611  and the inside surface  612  being both aspheric. 
     The second lens element  620  with positive refractive power has an outside surface  621  being concave in a paraxial region thereof and an inside surface  622  being convex in a paraxial region thereof. The second lens element  620  is made of a plastic material, and has the outside surface  621  and the inside surface  622  being both aspheric. 
     The third lens element  630  with negative refractive power has an outside surface  631  being concave in a paraxial region thereof and an inside surface  632  being convex in a paraxial region thereof. The third lens element  630  is made of a plastic material, and has the outside surface  631  and the inside surface  632  being both aspheric. 
     The fourth lens element  640  with positive refractive power has an outside surface  641  being convex in a paraxial region thereof and an inside surface  642  being concave in a paraxial region thereof. The fourth lens element  640  is made of a plastic material, and has the outside surface  641  and the inside surface  642  being both aspheric. Furthermore, the inside surface  642  of the fourth lens element  640  includes at least one critical point in an off-axis region thereof. 
     The filter  650  is made of a glass material and located between the fourth lens element  640  and the inside conjugation surface  660 , and will not affect the focal length of the optical lens assembly. 
     The detailed optical data of the 6th embodiment are shown in Tables 11A and 11B, and the aspheric surface data are shown in Table 12 below. 
     
       
         
           
               
             
               
                 TABLE 11A 
               
             
            
               
                   
               
               
                 6th Embodiment 
               
               
                 f = 1.84 mm, Fno = 2.00, HFOV = 35.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Outside 
                 Plano 
                 1000.000 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 1 
                 Lens 1 
                 0.972 
                 ASP 
                 0.344 
                 Plastic 
                 1.536 
                 56.1 
                 5.29 
               
               
                 2 
                   
                 1.295 
                 ASP 
                 0.137 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 3 
                 Ape. Stop 
                 Plano 
                 0.122 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 4 
                 Lens 2 
                 −4.092 
                 ASP 
                 0.745 
                 Plastic 
                 1.535 
                 56.0 
                 2.13 
               
               
                 5 
                   
                 −0.948 
                 ASP 
                 0.236 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 −0.313 
                 ASP 
                 0.370 
                 Plastic 
                 1.535 
                 56.0 
                 −1.62 
               
               
                 7 
                   
                 −0.692 
                 ASP 
                 0.030 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 0.715 
                 ASP 
                 0.969 
                 Plastic 
                 1.535 
                 56.0 
                 1.54 
               
               
                 9 
                   
                 2.820 
                 ASP 
                 0.500 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 10 
                 Filter 
                 Plano 
                 0.210 
                 Glass 
                 1.508 
                 64.2 
                 — 
               
               
                 11 
                   
                 Plano 
                 0.127 
                   
                   
                   
                   
               
               
                 12 
                 Inside 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
               
               
                   
               
               
                 Reference wavelength is 940.0 nm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 11B 
               
             
            
               
                   
               
               
                 6th Embodiment 
               
               
                 fd = 1.80 mm 
               
            
           
           
               
               
               
               
               
            
               
                   
                 Surface # 
                   
                 Index 
                 Focal Length 
               
               
                   
                   
               
               
                   
                  0 
                 Outside conjugation surface 
                   
                   
               
               
                   
                  1 
                 Lens 1 
                 1.545 
                  5.19 
               
               
                   
                  2 
                   
                   
                   
               
               
                   
                  3 
                 Ape. Stop 
                   
                   
               
               
                   
                  4 
                 Lens 2 
                 1.544 
                  2.09 
               
               
                   
                  5 
                   
                   
                   
               
               
                   
                  6 
                 Lens 3 
                 1.544 
                 −1.60 
               
               
                   
                  7 
                   
                   
                   
               
               
                   
                  8 
                 Lens 4 
                 1.544 
                  1.52 
               
               
                   
                  9 
                   
                   
                   
               
               
                   
                 10 
                 Filter 
                 1.517 
                 — 
               
               
                   
                 11 
                   
                   
                   
               
               
                   
                 12 
                 Inside conjugation surface 
               
               
                   
                   
               
               
                   
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 12 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 Surface* 
                 1 
                 2 
                 4 
                 5 
               
               
                   
               
               
                 k = 
                 6.1836E−01 
                 4.0166E+00 
                 −9.7783E+00  
                 4.7583E−02 
               
               
                 A4 = 
                 1.3739E−01 
                 −2.8248E−02  
                 −3.9856E−01  
                 9.2090E−02 
               
               
                 A6 = 
                 2.0678E−02 
                 1.0450E+00 
                 −3.6645E+00  
                 −1.2572E+00  
               
               
                 A8 = 
                 9.1300E−01 
                 −8.5701E+00  
                 2.6609E+01 
                 −6.4258E−01  
               
               
                 A10 = 
                   
                   
                 −1.3357E+02  
                 1.4704E+01 
               
               
                 A12 = 
                   
                   
                   
                 −2.9577E+01  
               
               
                 A14 = 
                   
                   
                   
                 1.9416E+01 
               
               
                   
               
               
                 Surface # 
                 6 
                 7 
                 8 
               
               
                   
               
               
                 k = 
                 −1.8931E+00  
                 −1.0086E+00  
                 −3.9034E+00  
                 −8.4049E−01  
               
               
                 A4 = 
                 4.3852E−01 
                 3.1018E−01 
                 −1.0149E−01  
                 −5.0401E−02  
               
               
                 A6 = 
                 −9.1531E+00  
                 −2.1623E+00  
                 1.5353E−01 
                 −1.2050E−01  
               
               
                 A8 = 
                 3.4314E+01 
                 5.1394E+00 
                 −1.3382E−01  
                 1.9224E−01 
               
               
                 A10 = 
                 −5.1998E+01  
                 −4.9759E+00  
                 6.1681E−02 
                 −1.3516E−01  
               
               
                 A12 = 
                 3.7372E+01 
                 1.8651E+00 
                 −1.4948E−02  
                 4.1994E−02 
               
               
                 A14 = 
                 −1.0742E+01  
                   
                   
                 −5.0119E−03  
               
               
                   
               
            
           
         
       
     
     In the 6th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 6th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 11A, Table 11B and Table 12 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 6th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                   
                 f [mm] 
                 1.84 
                 CT2/CT4 
                 0.77 
               
               
                   
                 Fno 
                 2.00 
                 TD [mm] 
                 2.95 
               
               
                   
                 HFOV [deg.] 
                 35.0 
                 TL/IH 
                 2.95 
               
               
                   
                 Nd1 
                 1.545 
                 R1/R2 
                 0.75 
               
               
                   
                 Vd1 
                 56.1 
                 R2/R7 
                 1.81 
               
               
                   
                 Vd1Nd2 
                 1.00 
                 R2/fd 
                 0.72 
               
               
                   
                 Vd1/Vd3 
                 1.00 
                 R8/fd 
                 1.56 
               
               
                   
                 Vd1Nd4 
                 1.00 
                 fd/fd3 
                 −1.13  
               
               
                   
                 Vd2 
                 56.0 
                 |fd/fd3| + |fd/fd4| 
                 2.32 
               
               
                   
                 Vd3 
                 56.0 
                 max (|fd/fd3|, |fd/fd4|) 
                 1.19 
               
               
                   
                 Vd4 
                 56.0 
                 (|1/fd1| + |1/fd2|)/ 
                 0.52 
               
               
                   
                   
                   
                 (|1/fd3| + |1/fd4|) 
                   
               
               
                   
                 ΣVd 
                 224.0 
                 SL/TL 
                 0.87 
               
               
                   
                 CT1/T12 
                 1.33 
               
               
                   
                   
               
            
           
         
       
     
     7th Embodiment 
       FIG.  13    is a schematic view of an electronic device according to the 7th embodiment of the present disclosure.  FIG.  14    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 7th embodiment. In  FIG.  13   , the electronic device includes an optical lens assembly (its reference numeral is omitted), wherein the optical lens assembly includes, in order from an outside to an inside, a first lens element  710 , an aperture stop  700 , a second lens element  720 , a third lens element  730 , a fourth lens element  740 , a filter  750  and an inside conjugation surface  760 . The optical lens assembly includes four lens elements ( 710 ,  720 ,  730  and  740 ) without additional one or more lens elements inserted between the first lens element  710  and the fourth lens element  740 . 
     The first lens element  710  with positive refractive power has an outside surface  711  being convex in a paraxial region thereof and an inside surface  712  being concave in a paraxial region thereof. The first lens element  710  is made of a plastic material, and has the outside surface  711  and the inside surface  712  being both aspheric. 
     The second lens element  720  with positive refractive power has an outside surface  721  being concave in a paraxial region thereof and an inside surface  722  being convex in a paraxial region thereof. The second lens element  720  is made of a plastic material, and has the outside surface  721  and the inside surface  722  being both aspheric. 
     The third lens element  730  with negative refractive power has an outside surface  731  being concave in a paraxial region thereof and an inside surface  732  being convex in a paraxial region thereof. The third lens element  730  is made of a plastic material, and has the outside surface  731  and the inside surface  732  being both aspheric. 
     The fourth lens element  740  with positive refractive power has an outside surface  741  being convex in a paraxial region thereof and an inside surface  742  being concave in a paraxial region thereof. The fourth lens element  740  is made of a plastic material, and has the outside surface  741  and the inside surface  742  being both aspheric. Furthermore, the inside surface  742  of the fourth lens element  740  includes at least one critical point in an off-axis region thereof. 
     The filter  750  is made of a glass material and located between the fourth lens element  740  and the inside conjugation surface  760 , and will not affect the focal length of the optical lens assembly. 
     The detailed optical data of the 7th embodiment are shown in Tables 13A and 13B, and the aspheric surface data are shown in Table 14 below. 
     
       
         
           
               
             
               
                 TABLE 13A 
               
             
            
               
                   
               
               
                 7th Embodiment 
               
               
                 f = 1.84 mm, Fno = 2.00, HFOV = 35.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Outside 
                 Plano 
                 1000.000 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 1 
                 Lens 1 
                 1.005 
                 ASP 
                 0.374 
                 Plastic 
                 1.618 
                 22.5 
                 4.53 
               
               
                 2 
                   
                 1.344 
                 ASP 
                 0.209 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 3 
                 Ape. Stop 
                 Plano 
                 0.163 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 4 
                 Lens 2 
                 −2.924 
                 ASP 
                 0.689 
                 Plastic 
                 1.618 
                 22.5 
                 2.18 
               
               
                 5 
                   
                 −1.005 
                 ASP 
                 0.229 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 −0.340 
                 ASP 
                 0.347 
                 Plastic 
                 1.618 
                 22.5 
                 −1.56 
               
               
                 7 
                   
                 −0.730 
                 ASP 
                 0.030 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 0.778 
                 ASP 
                 0.893 
                 Plastic 
                 1.618 
                 22.5 
                 1.47 
               
               
                 9 
                   
                 3.090 
                 ASP 
                 0.500 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 10 
                 Filter 
                 Plano 
                 0.210 
                 Glass 
                 1.508 
                 64.2 
                 — 
               
               
                 11 
                   
                 Plano 
                 0.140 
                   
                   
                   
                   
               
               
                 12 
                 Inside 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
               
               
                   
               
               
                 Reference wavelength is 940.0 nm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 13B 
               
             
            
               
                   
               
               
                 7th Embodiment 
               
               
                 fd = 1.76 mm 
               
            
           
           
               
               
               
               
               
            
               
                   
                 Surface # 
                   
                 Index 
                 Focal Length 
               
               
                   
                   
               
               
                   
                  0 
                 Outside conjugation surface 
                   
                   
               
               
                   
                  1 
                 Lens 1 
                 1.642 
                  4.33 
               
               
                   
                  2 
                   
                   
                   
               
               
                   
                  3 
                 Ape. Stop 
                   
                   
               
               
                   
                  4 
                 Lens 2 
                 1.642 
                  2.09 
               
               
                   
                  5 
                   
                   
                   
               
               
                   
                  6 
                 Lens 3 
                 1.642 
                 −1.52 
               
               
                   
                  7 
                   
                   
                   
               
               
                   
                  8 
                 Lens 4 
                 1.642 
                  1.41 
               
               
                   
                  9 
                   
                   
                   
               
               
                   
                 10 
                 Filter 
                 1.517 
                 — 
               
               
                   
                 11 
                   
                   
                   
               
               
                   
                 12 
                 Inside conjugation surface 
               
               
                   
                   
               
               
                   
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 14 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 Surface # 
                 1 
                 2 
                 4 
                 5 
               
               
                   
               
               
                 k = 
                 −5.9630E−01  
                 3.5943E+00 
                 −3.3220E+00  
                 3.6458E−02 
               
               
                 A4 = 
                 2.0767E−01 
                 −3.4294E−02  
                 −5.8724E−01  
                 −9.8875E−02  
               
               
                 A6 = 
                 1.8033E−01 
                 1.6371E−01 
                 −1.0831E+00  
                 −8.7868E−01  
               
               
                 A8 = 
                 3.7078E−01 
                 −3.4760E+00  
                 8.8810E−02 
                 −2.4206E+00  
               
               
                 A10 = 
                   
                   
                 −3.5630E+01  
                 1.9241E+01 
               
               
                 A12 = 
                   
                   
                   
                 −3.5364E+01  
               
               
                 A14 = 
                   
                   
                   
                 2.3156E+01 
               
               
                   
               
               
                 Surface # 
                 6 
                 7 
                 8 
                 9 
               
               
                   
               
               
                 k = 
                 −1.9412E+00  
                 −9.9475E−01  
                 −4.5839E+00  
                 3.8486E−01 
               
               
                 A4 = 
                 4.7519E−01 
                 2.8880E−01 
                 −7.3312E−02  
                 −4.6224E−02  
               
               
                 A6 = 
                 −9.5533E+00  
                 −2.0738E+00  
                 9.1987E−02 
                 −1.4985E−01  
               
               
                 A8 = 
                 3.6391E+01 
                 5.2460E+00 
                 −5.5296E−02  
                 2.5475E−01 
               
               
                 A10 = 
                 −5.8023E+01  
                 −5.3727E+00  
                 1.1194E−02 
                 −1.9055E−01  
               
               
                 A12 = 
                 4.4998E+01 
                 2.0601E+00 
                 −1.9353E−03  
                 6.4120E−02 
               
               
                 A14 = 
                 −1.4167E+01  
                   
                   
                 −8.2200E−03  
               
               
                   
               
            
           
         
       
     
     In the 7th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 7th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 13A, Table 13B and Table 14 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 7th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 1.84 
                 CT2/CT4 
                 0.77 
               
               
                 Fno 
                 2.00 
                 TD [mm] 
                 2.93 
               
               
                 HFOV [deg.] 
                 35.0 
                 TL/IH 
                 2.94 
               
               
                 Nd1 
                 1.642 
                 R1/R2 
                 0.75 
               
               
                 Vd1 
                 22.5 
                 R2/R7 
                 1.73 
               
               
                 Vd1Nd2 
                 1.00 
                 R2/fd 
                 0.76 
               
               
                 Vd1Nd3 
                 1.00 
                 R8/fd 
                 1.75 
               
               
                 Vd1Nd4 
                 1.00 
                 fd/fd3 
                 −1.16 
               
               
                 Vd2 
                 22.5 
                 |fd/fd3| + |fd/fd4| 
                 2.41 
               
               
                 Vd3 
                 22.5 
                 max (|fd/fd3|, |fd/fd4|) 
                 1.25 
               
               
                 Vd4 
                 22.5 
                 (|1/fd1| + |1/fd2|/(|1/fd3| + |1/fd4|) 
                 0.52 
               
               
                 ΣVd 
                 89.9 
                 SL/TL 
                 0.85 
               
               
                 CT1/T12 
                 1.01 
               
               
                   
               
            
           
         
       
     
     8th Embodiment 
       FIG.  15    is a schematic view of an electronic device according to the 8th embodiment of the present disclosure.  FIG.  16    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 8th embodiment. In  FIG.  15   , the electronic device includes an optical lens assembly (its reference numeral is omitted), wherein the optical lens assembly includes, in order from an outside to an inside, a first lens element  810 , an aperture stop  800 , a second lens element  820 , a third lens element  830 , a fourth lens element  840 , a filter  850  and an inside conjugation surface  860 . The optical lens assembly includes four lens elements ( 810 ,  820 ,  830  and  840 ) without additional one or more lens elements inserted between the first lens element  810  and the fourth lens element  840 . 
     The first lens element  810  with positive refractive power has an outside surface  811  being convex in a paraxial region thereof and an inside surface  812  being concave in a paraxial region thereof. The first lens element  810  is made of a plastic material, and has the outside surface  811  and the inside surface  812  being both aspheric. 
     The second lens element  820  with positive refractive power has an outside surface  821  being concave in a paraxial region thereof and an inside surface  822  being convex in a paraxial region thereof. The second lens element  820  is made of a plastic material, and has the outside surface  821  and the inside surface  822  being both aspheric. 
     The third lens element  830  with negative refractive power has an outside surface  831  being concave in a paraxial region thereof and an inside surface  832  being convex in a paraxial region thereof. The third lens element  830  is made of a plastic material, and has the outside surface  831  and the inside surface  832  being both aspheric. 
     The fourth lens element  840  with positive refractive power has an outside surface  841  being convex in a paraxial region thereof and an inside surface  842  being concave in a paraxial region thereof. The fourth lens element  840  is made of a plastic material, and has the outside surface  841  and the inside surface  842  being both aspheric. Furthermore, the inside surface  842  of the fourth lens element  840  includes at least one critical point in an off-axis region thereof. 
     The filter  850  is made of a glass material and located between the fourth lens element  840  and the inside conjugation surface  860 , and will not affect the focal length of the optical lens assembly. 
     The detailed optical data of the 8th embodiment are shown in Tables 15A and 15B, and the aspheric surface data are shown in Table 16 below. 
     
       
         
           
               
             
               
                 TABLE 15A 
               
             
            
               
                   
               
               
                 8th Embodiment 
               
               
                 f = 1.82 mm, Fno = 2.00, HFOV = 35.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Outside 
                 Plano 
                 1000.000 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 1 
                 Lens 1 
                 1.086 
                 ASP 
                 0.547 
                 Plastic 
                 1.634 
                 20.4 
                 5.12 
               
               
                 2 
                   
                 1.313 
                 ASP 
                 0.164 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 3 
                 Ape. Stop 
                 Plano 
                 0.145 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 4 
                 Lens 2 
                 −2.887 
                 ASP 
                 0.720 
                 Plastic 
                 1.617 
                 23.5 
                 1.88 
               
               
                 5 
                   
                 −0.908 
                 ASP 
                 0.193 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 −0.334 
                 ASP 
                 0.313 
                 Plastic 
                 1.634 
                 20.4 
                 −1.60 
               
               
                 7 
                   
                 −0.679 
                 ASP 
                 0.030 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 0.774 
                 ASP 
                 0.782 
                 Plastic 
                 1.617 
                 23.5 
                 1.50 
               
               
                 9 
                   
                 2.881 
                 ASP 
                 0.500 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 10 
                 Filter 
                 Plano 
                 0.210 
                 Glass 
                 1.508 
                 64.2 
                 — 
               
               
                 11 
                   
                 Plano 
                 0.164 
                   
                   
                   
                   
               
               
                 12 
                 Inside 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
               
               
                   
               
               
                 Reference wavelength is 940.0 nm. 
               
               
                 Effective radius of Surface 5 is 0.730 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 15B 
               
             
            
               
                   
               
               
                 8th Embodiment 
               
               
                 fd = 1.76 mm 
               
            
           
           
               
               
               
               
            
               
                 Surface # 
                   
                 Index 
                 Focal length 
               
               
                   
               
            
           
           
               
               
               
               
            
               
                 0 
                 Outside 
                   
                   
               
               
                   
                 conjugation surface 
                   
                   
               
               
                 1 
                 Lens 1 
                 1.660 
                 4.86 
               
               
                 2 
                   
                   
                   
               
               
                 3 
                 Ape. Stop 
                   
                   
               
               
                 4 
                 Lens 2 
                 1.639 
                 1.82 
               
               
                 5 
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 1.660 
                 −1.56 
               
               
                 7 
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 1.639 
                 1.45 
               
               
                 9 
                   
                   
                   
               
               
                 10 
                 Filter 
                 1.517 
                 — 
               
               
                 11 
                   
                   
                   
               
               
                 12 
                 Inside 
                 o 
                   
               
               
                   
                 conjugation surface 
                   
                   
               
               
                   
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 16 
               
               
                   
               
             
            
               
                 Aspheric Coefficients 
               
            
           
           
               
               
               
               
               
            
               
                 Sur- 
                   
                   
                   
                   
               
               
                 face 
                   
                   
                   
                   
               
               
                 # 
                 1 
                 2 
                 4 
                 5 
               
               
                   
               
               
                 k = 
                 −1.1773E+00 
                 4.2787E+00 
                 1.4436E+01 
                 −1.6411E−02 
               
               
                 A4 = 
                 2.0869E−01 
                 −9.8939E−02 
                 −5.6609E−01 
                 −2.3617E−01 
               
               
                 A6 = 
                 1.0093E−01 
                 −1.6956E−01 
                 −1.1558E+00 
                 1.5467E−01 
               
               
                 A8 = 
                 1.9955E−01 
                 −4.9746E+00 
                 −1.9035E−02 
                 −6.1069E+00 
               
               
                 A10 = 
                   
                   
                 −5.5220E+01 
                 2.7565E+01 
               
               
                 Al2 = 
                   
                   
                   
                 −4.7288E+01 
               
               
                 A14 = 
                   
                   
                   
                 2.9985E+01 
               
               
                   
               
               
                 Sur- 
                   
                   
                   
                   
               
               
                 face 
                   
                   
                   
                   
               
               
                 # 
                 6 
                 7 
                 8 
                 9 
               
               
                   
               
               
                 k = 
                 −2.0087E+00 
                 −1.0909E+00 
                 −5.3036E+00 
                 −1.3323E+00 
               
               
                 A4 = 
                 −1.8137E−01 
                 2.0326E−01 
                 3.6630E−02 
                 −4.0908E−02 
               
               
                 A6 = 
                 −3.4733E+00 
                 −9.9821E−01 
                 −3.8820E−02 
                 −2.4040E−02 
               
               
                 A8 = 
                 1.4158E+01 
                 2.6426E+00 
                 −2.5734E−02 
                 −4.7867E−02 
               
               
                 A10 = 
                 −1.8049E+01 
                 −2.9200E+00 
                 3.7060E−02 
                 7.1935E−02 
               
               
                 A12 = 
                 9.0815E+00 
                 1.2296E+00 
                 −1.3734E−02 
                 −3.5434E−02 
               
               
                 A14 = 
                 −1.2211E+00 
                   
                   
                 5.6570E−03 
               
               
                   
               
            
           
         
       
     
     In the 8th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 8th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 15A, Table 15B and Table 16 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 8th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 1.82 
                 CT2/CT4 
                 0.92 
               
               
                 Fno 
                 2.00 
                 TD [mm] 
                 2.89 
               
               
                 HFOV [deg.] 
                 35.0 
                 TL/IH 
                 2.93 
               
               
                 Nd1 
                 1.660 
                 R1/R2 
                 0.83 
               
               
                 Vd1 
                 20.4 
                 R2/R7 
                 1.70 
               
               
                 Vd1/Vd2 
                 0.87 
                 R2/fd 
                 0.75 
               
               
                 Vd1/Vd3 
                 1.00 
                 R8/fd 
                 1.64 
               
               
                 Vd1/Vd4 
                 0.87 
                 fd/fd3 
                 −1.13 
               
               
                 Vd2 
                 23.5 
                 |fd/fd3| + |fd/fd4| 
                 2.34 
               
               
                 Vd3 
                 20.4 
                 max (|fd/fd3|, |fd/fd4|) 
                 1.22 
               
               
                 Vd4 
                 23.5 
                 (|gd1| + |1/fd2|)/(|1/fd3| + |1/fd4|) 
                 0.57 
               
               
                 ΣVd 
                 87.8 
                 SL/TL 
                 0.81 
               
               
                 CT1/T12 
                 1.77 
               
               
                   
               
            
           
         
       
     
     9th Embodiment 
       FIG.  17    is a schematic view of an electronic device according to the 9th embodiment of the present disclosure.  FIG.  18    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 9th embodiment. In  FIG.  17   , the electronic device includes an optical lens assembly (its reference numeral is omitted), wherein the optical lens assembly includes, in order from an outside to an inside, an aperture stop  900 , a first lens element  910 , a second lens element  920 , a third lens element  930 , a fourth lens element  940 , a filter  950  and an inside conjugation surface  960 . The optical lens assembly includes four lens elements ( 910 ,  920 ,  930  and  940 ) without additional one or more lens elements inserted between the first lens element  910  and the fourth lens element  940 . 
     The first lens element  910  with positive refractive power has an outside surface  911  being convex in a paraxial region thereof and an inside surface  912  being concave in a paraxial region thereof. The first lens element  910  is made of a glass material, and has the outside surface  911  and the inside surface  912  being both aspheric. 
     The second lens element  920  with positive refractive power has an outside surface  921  being convex in a paraxial region thereof and an inside surface  922  being convex in a paraxial region thereof. The second lens element  920  is made of a plastic material, and has the outside surface  921  and the inside surface  922  being both aspheric. 
     The third lens element  930  with positive refractive power has an outside surface  931  being concave in a paraxial region thereof and an inside surface  932  being convex in a paraxial region thereof. The third lens element  930  is made of a plastic material, and has the outside surface  931  and the inside surface  932  being both aspheric. 
     The fourth lens element  940  with negative refractive power has an outside surface  941  being convex in a paraxial region thereof and an inside surface  942  being concave in a paraxial region thereof. The fourth lens element  940  is made of a plastic material, and has the outside surface  941  and the inside surface  942  being both aspheric. Furthermore, each of the outside surface  941  and the inside surface  942  of the fourth lens element  940  includes at least one critical point in an off-axis region thereof. 
     The filter  950  is made of a glass material and located between the fourth lens element  940  and the inside conjugation surface  960 , and will not affect the focal length of the optical lens assembly. 
     The detailed optical data of the 9th embodiment are shown in Tables 17A and 17B, and the aspheric surface data are shown in Table 18 below. 
     
       
         
           
               
             
               
                 TABLE 17A 
               
             
            
               
                   
               
               
                 9th Embodiment 
               
               
                 f = 2.41 mm, Fno = 1.51, HFOV = 43.2 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Outside 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
                   
                   
                   
                   
                   
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.228 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 1.436 
                 ASP 
                 0.505 
                 Glass 
                 1.704 
                 29.2 
                 3.67 
               
               
                 3 
                   
                 2.759 
                 ASP 
                 0.318 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 203.542 
                 ASP 
                 0.380 
                 Plastic 
                 1.637 
                 20.4 
                 9.52 
               
               
                 5 
                   
                 −6.262 
                 ASP 
                 0.248 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 −1.025 
                 ASP 
                 0.525 
                 Plastic 
                 1.619 
                 23.3 
                 3.06 
               
               
                 7 
                   
                 −0.795 
                 ASP 
                 0.010 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 1.384 
                 ASP 
                 0.428 
                 Plastic 
                 1.629 
                 21.8 
                 −4.47 
               
               
                 9 
                   
                 0.817 
                 ASP 
                 0.500 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 10 
                 Filter 
                 Plano 
                 0.080 
                 Glass 
                 1.510 
                 64.2 
                 — 
               
               
                 11 
                   
                 Plano 
                 0.493 
                   
                   
                   
                   
               
               
                 12 
                 Inside 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
               
               
                   
               
               
                 Reference wavelength is 850.0 nm. 
               
               
                 Effective radius of Surface 5 is 0.850 mm 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 17B 
               
             
            
               
                   
               
               
                 9th Embodiment 
               
               
                 fd =2.33 mm 
               
            
           
           
               
               
               
               
               
            
               
                   
                 Surface # 
                   
                 Index 
                 Focal Length 
               
               
                   
                   
               
            
           
           
               
               
               
               
               
            
               
                   
                 0 
                 Outside 
                   
                   
               
               
                   
                   
                 conjugation 
                   
                   
               
               
                   
                   
                 surface 
                   
                   
               
               
                   
                 1 
                 Ape. Stop 
                   
                   
               
               
                   
                 2 
                 Lens 1 
                 1.722 
                 3.57 
               
               
                   
                 3 
                   
                   
                   
               
               
                   
                 4 
                 Lens 2 
                 1.660 
                 9.20 
               
               
                   
                 5 
                   
                   
                   
               
               
                   
                 6 
                 Lens 3 
                 1.639 
                 2.94 
               
               
                   
                 7 
                   
                   
                   
               
               
                   
                 8 
                 Lens 4 
                 1.650 
                 −4.37 
               
               
                   
                 9 
                   
                   
                   
               
               
                   
                 10 
                 Filter 
                 1.517 
                 — 
               
               
                   
                 11 
                   
                   
                   
               
               
                   
                 12 
                 Inside 
                   
                   
               
               
                   
                   
                 conjugation 
                   
                   
               
               
                   
                   
                 surface 
                   
                   
               
               
                   
                   
               
               
                   
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 18 
               
               
                   
               
             
            
               
                 Aspheric Coefficients 
               
            
           
           
               
               
               
               
               
            
               
                 Sur- 
                   
                   
                   
                   
               
               
                 face 
                   
                   
                   
                   
               
               
                 # 
                 2 
                 3 
                 4 
                 5 
               
               
                   
               
               
                 k = 
                 −1.3343E+00 
                 6.3565E+00 
                 −8.9972E+01 
                 −4.8494E+01 
               
               
                 A4 = 
                 3.5787E−02 
                 −4.9881E−02 
                 −3.0267E−01 
                 −9.6327E−02 
               
               
                 A6 = 
                 1.7787E−01 
                 −4.0814E−01 
                 6.2513E−01 
                 −9.2262E−01 
               
               
                 A8 = 
                 −6.5441E−01 
                 1.5443E+00 
                 −6.3569E+00 
                 3.3913E+00 
               
               
                 A10 = 
                 1.0055E+00 
                 −5.2769E+00 
                 2.5668E+01 
                 −8.7653E+00 
               
               
                 A12 = 
                 −5.4588E−01 
                 8.1632E+00 
                 −6.5289E+01 
                 1.2365E+01 
               
               
                 A14 = 
                 −1.7034E−01 
                 −6.6066E+00 
                 8.7135E+01 
                 −7.0062E+00 
               
               
                 A16 = 
                   
                 2.2806E+00 
                 −4.4184E+01 
                 1.0664E+00 
               
               
                   
               
               
                 Sur- 
                   
                   
                   
                   
               
               
                 face 
                   
                   
                   
                   
               
               
                 # 
                 6 
                 7 
                 8 
                 9 
               
               
                   
               
               
                 k = 
                 1.1219E−01 
                 −6.1301E+00 
                 −7.0290E−01 
                 −5.2049E+00 
               
               
                 A4 = 
                 5.4399E−01 
                 −9.7256E−01 
                 −5.8326E−01 
                 −2.3673E−01 
               
               
                 A6 = 
                 −2.5780E+00 
                 2.7659E+00 
                 5.7715E−01 
                 2.0545E−01 
               
               
                 A8 = 
                 8.7026E+00 
                 −6.3750E+00 
                 −4.0796E−01 
                 −1.2917E−01 
               
               
                 A10 = 
                 −1.8769E+01 
                 9.7826E+00 
                 1.8578E−01 
                 5.1537E−02 
               
               
                 A12 = 
                 2.8770E+01 
                 −8.3215E+00 
                 −5.1432E−02 
                 −1.2748E−02 
               
               
                 A14 = 
                 −2.4759E+01 
                 3.5985E+00 
                 7.8871E−03 
                 1.7819E−03 
               
               
                 A16 = 
                 8.7402E+00 
                 −6.2474E−01 
                 −5.1549E−04 
                 −1.0640E−04 
               
               
                   
               
            
           
         
       
     
     In the 9th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 9th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 17A, Table 17B and Table 18 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 9th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 2.41 
                 CT2/CT4 
                 0.89 
               
               
                 Fno 
                 1.51 
                 TD [mm] 
                 2.41 
               
               
                 HFOV [deg.] 
                 43.2 
                 TL/IH 
                 1.52 
               
               
                 Ndl 
                 1.722 
                 R1/R2 
                 0.52 
               
               
                 Vd1 
                 29.2 
                 R2/R7 
                 1.99 
               
               
                 Vd1/Vd2 
                 1.43 
                 R2/fd 
                 1.18 
               
               
                 Vd1/Vd3 
                 1.26 
                 R8/fd 
                 0.35 
               
               
                 Vd1/Vd4 
                 1.34 
                 fd/fd3 
                 0.79 
               
               
                 Vd2 
                 20.4 
                 |fd/fd3| + |fd/fd4| 
                 1.33 
               
               
                 Vd3 
                 23.3 
                 max(|fd/fd3|, |fd/fd4|) 
                 0.79 
               
               
                 Vd4 
                 21.8 
                 (|1/fd1| + |1/fd2|)/(|1/fd3| + |1/fd4|) 
                 0.68 
               
               
                 ΣVd 
                 94.7 
                 SL/TL 
                 0.93 
               
               
                 CT1/T12 
                 1.59 
               
               
                   
               
            
           
         
       
     
     10th Embodiment 
       FIG.  19    is a schematic view of an electronic device according to the 10th embodiment of the present disclosure.  FIG.  20    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 10th embodiment. In  FIG.  19   , the electronic device includes an optical lens assembly (its reference numeral is omitted), wherein the optical lens assembly includes, in order from an outside to an inside, an aperture stop  1000 , a first lens element  1010 , a second lens element  1020 , a third lens element  1030 , a fourth lens element  1040 , a filter  1050  and an inside conjugation surface  1060 . The optical lens assembly includes four lens elements ( 1010 ,  1020 ,  1030  and  1040 ) without additional one or more lens elements inserted between the first lens element  1010  and the fourth lens element  1040 . 
     The first lens element  1010  with positive refractive power has an outside surface  1011  being convex in a paraxial region thereof and an inside surface  1012  being concave in a paraxial region thereof. The first lens element  1010  is made of a plastic material, and has the outside surface  1011  and the inside surface  1012  being both aspheric. 
     The second lens element  1020  with positive refractive power has an outside surface  1021  being concave in a paraxial region thereof and an inside surface  1022  being convex in a paraxial region thereof. The second lens element  1020  is made of a plastic material, and has the outside surface  1021  and the inside surface  1022  being both aspheric. 
     The third lens element  1030  with positive refractive power has an outside surface  1031  being concave in a paraxial region thereof and an inside surface  1032  being convex in a paraxial region thereof. The third lens element  1030  is made of a plastic material, and has the outside surface  1031  and the inside surface  1032  being both aspheric. 
     The fourth lens element  1040  with negative refractive power has an outside surface  1041  being convex in a paraxial region thereof and an inside surface  1042  being concave in a paraxial region thereof. The fourth lens element  1040  is made of a plastic material, and has the outside surface  1041  and the inside surface  1042  being both aspheric. Furthermore, each of the outside surface  1041  and the inside surface  1042  of the fourth lens element  1040  includes at least one critical point in an off-axis region thereof. 
     The filter  1050  is made of a glass material and located between the fourth lens element  1040  and the inside conjugation surface  1060 , and will not affect the focal length of the optical lens assembly. 
     The detailed optical data of the 10th embodiment are shown in Table 19, and the aspheric surface data are shown in Table 20 below. 
     
       
         
           
               
             
               
                 TABLE 19 
               
             
            
               
                   
               
               
                 10th Embodiment 
               
               
                 f = 2.36 mm, Fno = 1.80, HFOV = 43.4 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Outside 
                   
                   
                   
                   
                   
                   
               
               
                   
                 conjugation 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                   
                 surface 
                   
                   
                   
                   
                   
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.156 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 1.350 
                 ASP 
                 0.542 
                 Plastic 
                 1.584 
                 28.2 
                 3.32 
               
               
                 3 
                   
                 3.785 
                 ASP 
                 0.328 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 −16.605 
                 ASP 
                 0.278 
                 Plastic 
                 1.656 
                 21.3 
                 13.10 
               
               
                 5 
                   
                 −5.700 
                 ASP 
                 0.249 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 −1.013 
                 ASP 
                 0.380 
                 Plastic 
                 1.582 
                 30.2 
                 3.09 
               
               
                 7 
                   
                 −0.738 
                 ASP 
                 0.182 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 1.467 
                 ASP 
                 0.418 
                 Plastic 
                 1.688. 
                 18.7 
                 −3.11 
               
               
                 9 
                   
                 0.769 
                 ASP 
                 0.500 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 10 
                 Filter 
                 Plano 
                 0.210 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 11 
                   
                 Plano 
                 0.240 
                   
                   
                   
                   
               
               
                 12 
                 Inside 
                   
                   
                   
                   
                   
                   
               
               
                   
                 conjugation 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
                 surface 
               
               
                   
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
               
                 Effective radius of Surface 5 is 0.820 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 20 
               
               
                   
               
             
            
               
                 Aspheric Coefficients 
               
            
           
           
               
               
               
               
               
            
               
                 Sur- 
                   
                   
                   
                   
               
               
                 face 
                   
                   
                   
                   
               
               
                 # 
                 2 
                 3 
                 4 
                 5 
               
               
                   
               
               
                 k = 
                 −1.5044E+00 
                 1.0265E+01 
                 −9.0000E+01 
                 −3.2215E+01 
               
               
                 A4 = 
                 −1.3187E−01 
                 3.4223E−02 
                 −5.6092E−01 
                 −1.7913E−01 
               
               
                 A6 = 
                 2.1246E+00 
                 −2.0348E+00 
                 2.1196E+00 
                 −9.4201E−01 
               
               
                 A8 
                 −1.2215E+01 
                 1.0753E+01 
                 −1.7129E+01 
                 6.7388E+00 
               
               
                 A10 = 
                 3.6256E+01 
                 −3.4036E+01 
                 6.8427E+01 
                 −2.7628E+01 
               
               
                 A12 = 
                 −5.4434E+01 
                 5.0385E+01 
                 −1.8863E+02 
                 5.4795E+01 
               
               
                 A14 = 
                 3.2161E+01 
                 −2.5618E+01 
                 2.9953E+02 
                 −4.9509E+01 
               
               
                 M6 
                   
                 −4.8799E+00 
                 −1.8799E+02 
                 1.7088E+01 
               
               
                   
               
               
                 Sur- 
                   
                   
                   
                   
               
               
                 face 
                   
                   
                   
                   
               
               
                 # 
                 6 
                 7 
                 8 
                 9 
               
               
                   
               
               
                 k = 
                 9.5516E−02 
                 −5.5201E+00 
                 −6.7958E−01 
                 −4.3677E+00 
               
               
                 A4 = 
                 6.6544E−01 
                 −1.2236E+00 
                 −6.3155E−01 
                 −2.9848E−01 
               
               
                 A6 = 
                 −3.3468E+00 
                 4.0302E+00 
                 5.2657E−01 
                 2.8322E−01 
               
               
                 A8 = 
                 1.2778E+01 
                 −1.1278E+01 
                 −2.9289E−01 
                 −1.8577E−01 
               
               
                 A10 = 
                 −2.9710E+01 
                 1.9944E+01 
                 1.0103E−01 
                 7.8158E−02 
               
               
                 A12 = 
                 4.5635E+01 
                 −1.8696E+01 
                 −1.9624E−02 
                 −1.9985E−02 
               
               
                 A14 = 
                 −3.9054E+01 
                 8.5520E+00 
                 1.8249E−03 
                 2.7788E−03 
               
               
                 A16 = 
                 1.3730E+01 
                 −1.5038E+00 
                 −5.0883E−05 
                 −1.5954E−04 
               
               
                   
               
            
           
         
       
     
     In the 10th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 10th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 19 and Table 20 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 10th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 2.36 
                 CT2/CT4 
                 0.67 
               
               
                 Fno 
                 1.80 
                 TD [mm] 
                 2.38 
               
               
                 HFOV [deg.] 
                 43.4 
                 TL/IH 
                 1.47 
               
               
                 Nd1 
                 1.584 
                 R1/R2 
                 0.36 
               
               
                 Vd1 
                 28.2 
                 R2/R7 
                 2.58 
               
               
                 Vd1/Vd2 
                 1.33 
                 R2/fd 
                 1.60 
               
               
                 Vd1/Vd3 
                 0.93 
                 R8/fd 
                 0.33 
               
               
                 Vd1/Vd4 
                 1.51 
                 fd/fd3 
                 0.76 
               
               
                 Vd2 
                 21.3 
                 |fd/fd3| + |fd/fd4| 
                 1.52 
               
               
                 Vd3 
                 30.2 
                 max (|fd/fd3|, |fd/fd4|) 
                 0.76 
               
               
                 Vd4 
                 18.7 
                 (|l/fd1| + |1/fd2|)/(|1/fd3| + |1/fd4|) 
                 0.59 
               
               
                 ΣVd 
                 98.4 
                 SL/TL 
                 0.95 
               
               
                 CT1/T12 
                 1.65 
               
               
                   
               
            
           
         
       
     
     11th Embodiment 
       FIG.  21    is a schematic view of an electronic device according to the 11th embodiment of the present disclosure.  FIG.  22    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 11th embodiment. In  FIG.  21   , the electronic device includes an optical lens assembly (its reference numeral is omitted), wherein the optical lens assembly includes, in order from an outside to an inside, an aperture stop  1100 , a first lens element  1110 , a second lens element  1120 , a third lens element  1130 , a fourth lens element  1140 , a filter  1150  and an inside conjugation surface  1160 . The optical lens assembly includes four lens elements ( 1110 ,  1120 ,  1130  and  1140 ) without additional one or more lens elements inserted between the first lens element  1110  and the fourth lens element  1140 . 
     The first lens element  1110  with positive refractive power has an outside surface  1111  being convex in a paraxial region thereof and an inside surface  1112  being concave in a paraxial region thereof. The first lens element  1110  is made of a plastic material, and has the outside surface  1111  and the inside surface  1112  being both aspheric. 
     The second lens element  1120  with positive refractive power has an outside surface  1121  being concave in a paraxial region thereof and an inside surface  1122  being convex in a paraxial region thereof. The second lens element  1120  is made of a plastic material, and has the outside surface  1121  and the inside surface  1122  being both aspheric. 
     The third lens element  1130  with positive refractive power has an outside surface  1131  being concave in a paraxial region thereof and an inside surface  1132  being convex in a paraxial region thereof. The third lens element  1130  is made of a plastic material, and has the outside surface  1131  and the inside surface  1132  being both aspheric. 
     The fourth lens element  1140  with negative refractive power has an outside surface  1141  being convex in a paraxial region thereof and an inside surface  1142  being concave in a paraxial region thereof. The fourth lens element  1140  is made of a plastic material, and has the outside surface  1141  and the inside surface  1142  being both aspheric. Furthermore, each of the outside surface  1141  and the inside surface  1142  of the fourth lens element  1140  includes at least one critical point in an off-axis region thereof. 
     The filter  1150  is made of a glass material and located between the fourth lens element  1140  and the inside conjugation surface  1160 , and will not affect the focal length of the optical lens assembly. 
     The detailed optical data of the 11th embodiment are shown in Tables 21A and 21B, and the aspheric surface data are shown in Table 22 below. 
     
       
         
           
               
             
               
                 TABLE 21A 
               
             
            
               
                   
               
               
                 11th Embodiment 
               
               
                 f = 2.41 mm, Fno = 1.53, HFOV = 42.5 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Outside 
                 Plano 
                 600.000 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
                   
                   
                   
                   
                   
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.257 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 1.317 
                 ASP 
                 0.513 
                 Plastic 
                 1.634 
                 20.4 
                 3.48 
               
               
                 3 
                   
                 2.778 
                 ASP 
                 0.362 
                   
                   
                   
                   
               
               
                   
                 Lens 2 
                 −28.731 
                 ASP 
                 0.299 
                 Plastic 
                 1.634 
                 20.4 
                 11.77 
               
               
                 5 
                   
                 −5.946 
                 ASP 
                 0.243 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 −1.020 
                 ASP 
                 0.487 
                 Plastic 
                 1.634 
                 20.4 
                 3.05 
               
               
                 7 
                   
                 −0.791 
                 ASP 
                 0.030 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 1.381 
                 ASP 
                 0.405 
                 Plastic 
                 1.634 
                 20.4 
                 −4.42 
               
               
                 9 
                   
                 0.820 
                 ASP 
                 0.500 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 10 
                 Filter 
                 Plano 
                 0.300 
                 Glass 
                 1.508 
                 64.2 
                 — 
               
               
                 11 
                   
                 Plano 
                 0.350 
                   
                   
                   
                   
               
               
                 12 
                 Inside 
                   
                   
                   
                   
                   
                   
               
               
                   
                 conjugation 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
                 surface 
               
               
                   
               
               
                 Reference wavelength is 940.0 nm. 
               
               
                 Effective radius of Surface 5 is 0.820 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 21B 
               
             
            
               
                   
               
               
                 11th Embodiment 
               
               
                 fd = 2.31 mm 
               
            
           
           
               
               
               
               
            
               
                   
                 Surface # 
                 Index 
                 Focal Length 
               
               
                   
                   
               
            
           
           
               
               
               
               
            
               
                   
                 0 
                 Outside conjugation surface 
                   
               
               
                   
                 1 
                 Ape. Stop 
                   
               
            
           
           
               
               
               
               
               
            
               
                   
                 2 
                 Lens 1 
                 1.660 
                 3.33 
               
               
                   
                 3 
                   
                   
                   
               
               
                   
                 4 
                 Lens 2 
                 1.660 
                 11.30 
               
               
                   
                 5 
                   
                   
                   
               
               
                   
                 6 
                 Lens 3 
                 1.660 
                 2.90 
               
               
                   
                 7 
                   
                   
                   
               
               
                   
                 8 
                 Lens 4 
                 1.660 
                 −4.29 
               
               
                   
                 9 
                   
                   
                   
               
               
                   
                 10 
                 Filter 
                 1.517 
                 - 
               
               
                   
                 11 
                   
                   
                   
               
               
                   
                 12 
                 Inside conjugation surface 
               
               
                   
                   
               
               
                   
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 22 
               
               
                   
               
             
            
               
                 Aspheric Coefficients 
               
            
           
           
               
               
               
               
               
            
               
                 Sur- 
                   
                   
                   
                   
               
               
                 face 
                   
                   
                   
                   
               
               
                 # 
                 2 
                 3 
                 4 
                 5 
               
               
                   
               
               
                 k = 
                 −1.0753E+00 
                 9.7802E+00 
                 6.3171E+01 
                 3.7325E+00 
               
               
                 A4 = 
                 5.4959E−02 
                 −3.9630E−02 
                 −3.6536E−01 
                 −1.9598E−01 
               
               
                 A6 = 
                 1.0492E−01 
                 −4.5565E−01 
                 5.7047E−01 
                 −5.6492E−01 
               
               
                 A8 = 
                 −1.9484E−01 
                 1.0801E+00 
                 −7.7681E+00 
                 1.0803E+00 
               
               
                 A10 = 
                 −2.6211E−01 
                 −1.3355E+00 
                 3.6161E+01 
                 −2.0683E+00 
               
               
                 A12 = 
                 1.2488E+00 
                 −4.6404E+00 
                 −1.0187E+02 
                 2.6479E+00 
               
               
                 A14 = 
                 −1.1864E+00 
                 1.1437E+01 
                 1.4684E+02 
                 5.8189E−01 
               
               
                 A16 = 
                   
                 −7.6701E+00 
                 −7.9522E+01 
                 −1.2110E+00 
               
               
                   
               
               
                 Sur- 
                   
                   
                   
                   
               
               
                 face 
                   
                   
                   
                   
               
               
                 # 
                 6 
                 7 
                 8 
                 9 
               
               
                   
               
               
                 k = 
                 1.1229E−01 
                 −6.3936E+00 
                 −7.0024E−01 
                 −5.1268E+00 
               
               
                 A4 = 
                 3.3200E−01 
                 −1.0902E+00 
                 −5.8244E−01 
                 −2.4265E−01 
               
               
                 A6 = 
                 −1.0344E+00 
                 3.3258E+00 
                 5.5162E−01 
                 2.1541E−01 
               
               
                 A8 = 
                 7.8602E−01 
                 −8.3756E+00 
                 −3.7434E−01 
                 −1.4747E−01 
               
               
                 A10 = 
                 3.5442E+00 
                 1.3896E+01 
                 1.6127E−01 
                 6.6425E−02 
               
               
                 A12 = 
                 −3.5166E4−00 
                 −1.2822E+01 
                 −4.1668E−02 
                 −1.9002E−02 
               
               
                 A14 = 
                 −2.0857E+00 
                 6.0361E+00 
                 5.9602E−03 
                 3.0844E−03 
               
               
                 A16 = 
                 2.6553E+00 
                 −1.1414E+00 
                 −3.6815E−04 
                 −2.1130E−04 
               
               
                   
               
            
           
         
       
     
     In the 11th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 11th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 21A, Table 21B and Table 22 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 11th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 2.41 
                 CT2/CT4 
                 0.74 
               
               
                 Fno 
                 1.53 
                 TD [mm] 
                 2.34 
               
               
                 HFOV [deg.] 
                 42.5 
                 TL/IH 
                 1.54 
               
               
                 Nd1 
                 1.660 
                 RI/R2 
                 0.47 
               
               
                 Vd1 
                 20.4 
                 R2/R7 
                 2.01 
               
               
                 Vd1/Vd2 
                 1.00 
                 R2/fd 
                 1.20 
               
               
                 Vd1/Vd3 
                 1.00 
                 R8/fd 
                 0.36 
               
               
                 Vd1/Vd4 
                 1.00 
                 fd/fd3 
                 0.80 
               
               
                 Vd2 
                 20.4 
                 |fd/fd3| + |fd/fd4| 
                 1.33 
               
               
                 Vd3 
                 20.4 
                 max (|fd/fd3|, |fd/fd4|) 
                 0.80 
               
               
                 Vd4 
                 20.4 
                 (|1/fd1| + |1/fd2|)/(|1/fd3| + |1/fd4|) 
                 0.67 
               
               
                 ΣVd 
                 81.6 
                 SL/TL 
                 0.93 
               
               
                 CT1/T12 
                 1.42 
               
               
                   
               
            
           
         
       
     
     12th Embodiment 
       FIG.  23    is a schematic view of an electronic device according to the 12th embodiment of the present disclosure.  FIG.  24    shows spherical aberration curves, astigmatic field curves and a distortion curve of the electronic device according to the 12th embodiment. In  FIG.  23   , the electronic device includes an optical lens assembly (its reference numeral is omitted), wherein the optical lens assembly includes, in order from an outside to an inside, a first lens element  1210 , an aperture stop  1200 , a second lens element  1220 , a third lens element  1230 , a fourth lens element  1240  and an inside conjugation surface  1260 . The optical lens assembly includes four lens elements ( 1210 ,  1220 ,  1230  and  1240 ) without additional one or more lens elements inserted between the first lens element  1210  and the fourth lens element  1240 . 
     The first lens element  1210  with negative refractive power has an outside surface  1211  being convex in a paraxial region thereof and an inside surface  1212  being concave in a paraxial region thereof. The first lens element  1210  is made of a plastic material, and has the outside surface  1211  and the inside surface  1212  being both aspheric. 
     The second lens element  1220  with positive refractive power has an outside surface  1221  being concave in a paraxial region thereof and an inside surface  1222  being convex in a paraxial region thereof. The second lens element  1220  is made of a plastic material, and has the outside surface  1221  and the inside surface  1222  being both aspheric. 
     The third lens element  1230  with negative refractive power has an outside surface  1231  being concave in a paraxial region thereof and an inside surface  1232  being convex in a paraxial region thereof. The third lens element  1230  is made of a plastic material, and has the outside surface  1231  and the inside surface  1232  being both aspheric. 
     The fourth lens element  1240  with positive refractive power has an outside surface  1241  being convex in a paraxial region thereof and an inside surface  1242  being convex in a paraxial region thereof. The fourth lens element  1240  is made of a plastic material, and has the outside surface  1241  and the inside surface  1242  being both aspheric. Furthermore, the inside surface  1242  of the fourth lens element  1240  includes at least one critical point in an off-axis region thereof. 
     The detailed optical data of the 12th embodiment are shown in Tables 23A and 23B, and the aspheric surface data are shown in Table 24 below. 
     
       
         
           
               
             
               
                 TABLE 23A 
               
             
            
               
                   
               
               
                 12th Embodiment 
               
               
                 f = 1.03 mm, Fno = 1.50, HFOV = 42.5 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Outside 
                 Plano 
                 600.000 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 1 
                 Lens 1 
                 1.422 
                 ASP 
                 0.846 
                 Plastic 
                 1.618 
                 22.5 
                 −5.27 
               
               
                 2 
                   
                 0.765 
                 ASP 
                 0.222 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 3 
                 Ape. Stop 
                 Plano 
                 0.049 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 4 
                 Lens 2 
                 −7.695 
                 ASP 
                 0.560 
                 Plastic 
                 1.618 
                 22.5 
                 0.78 
               
               
                 5 
                   
                 −0.466 
                 ASP 
                 0.135 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 −0.271 
                 ASP 
                 0.353 
                 Plastic 
                 1.634 
                 20.4 
                 −0.90 
               
               
                 7 
                   
                 −0.776 
                 ASP 
                 0.030 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 0.510 
                 ASP 
                 0.759 
                 Plastic 
                 1.535 
                 56.0 
                 0.93 
               
               
                 9 
                   
                 −8.998 
                 ASP 
                 0.535 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 10 
                 Inside 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
                 conjugation 
                   
                   
                   
                   
                   
                   
               
               
                   
                 surface 
               
               
                   
               
               
                 Reference wavelength is 940.0 nm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 23B 
               
             
            
               
                   
               
               
                 12th Embodiment 
               
               
                 fd =1.01 mm 
               
            
           
           
               
               
               
               
            
               
                 Surface # 
                   
                 Index 
                 Focal Length 
               
               
                   
               
            
           
           
               
               
               
               
            
               
                 0 
                 Outside conjugation surface 
                   
                   
               
               
                 1 
                 Lens 1 
                 1.642 
                 −5.19 
               
               
                 2 
                   
                   
                   
               
               
                 3 
                 Ape. Stop 
                   
                   
               
               
                 4 
                 Lens 2 
                 1.642 
                 0.75 
               
               
                 5 
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 1.660 
                 −0.87 
               
               
                 7 
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 1.544 
                 0.91 
               
               
                 9 
                   
                   
                   
               
               
                 10 
                 Inside conjugation surface 
                   
                   
               
               
                   
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 24 
               
               
                   
               
             
            
               
                 Aspheric Coefficients 
               
            
           
           
               
               
               
               
               
            
               
                 Sur- 
                   
                   
                   
                   
               
               
                 face 
                   
                   
                   
                   
               
               
                 # 
                 1 
                 2 
                 4 
                 5 
               
               
                   
               
               
                 k = 
                 −7.4869E+00 
                 −4.7587E−01 
                 9.9000E+01 
                 −7.4153E−01 
               
               
                 A4 = 
                 4.2236E−01 
                 5.9226E−01 
                 −1.4291E+00 
                 1.6574E+00 
               
               
                 A6 = 
                 −2.7562E−01 
                 4.2114E+00 
                 1.4924E+01 
                 −1.1222E+01 
               
               
                 A8 = 
                 2.5050E−01 
                 −2.3869E+01 
                 −2.7186E+02 
                 4.5152E+01 
               
               
                 A10 = 
                   
                   
                 1.1921E+03 
                 −7.4246E+01 
               
               
                 Al 2 = 
                   
                   
                   
                 −1.0727E+02 
               
               
                 A14 = 
                   
                   
                   
                 3.4937E+02 
               
               
                   
               
               
                 Sur- 
                   
                   
                   
                   
               
               
                 face 
                   
                   
                   
                   
               
               
                 # 
                 6 
                 7 
                 8 
                 9 
               
               
                   
               
               
                 k = 
                 −2.5394E+00 
                 −4.5848E−01 
                 −5.3201E+00 
                 3.5645E+01 
               
               
                 A4 = 
                 4.5493E−01 
                 −2.2310E−01 
                 5.9458E−01 
                 6.1050E−01 
               
               
                 A6 = 
                 −1.7076E+01 
                 5.2812E−01 
                 −2.3503E+00 
                 −1.1581E+00 
               
               
                 A8 = 
                 1.0074E+02 
                 −1.0538E+01 
                 3.6851E+00 
                 −2.1566E+00 
               
               
                 A10 = 
                 −2.4822E+02 
                 4.2676E+01 
                 −2.6567E+00 
                 9.2076E+00 
               
               
                 A12 = 
                 3.0275E+02 
                 −6.4731E+01 
                 7.2622E−01 
                 −1.1452E+01 
               
               
                 A14 = 
                 −1.5186E+02 
                 3.6523E+01 
                   
                 6.2329E+00 
               
               
                 A16 = 
                   
                   
                   
                 −1.2626E+00 
               
               
                   
               
            
           
         
       
     
     In the 12th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 12th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 23A, Table 23B and Table 24 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 12th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 1.03 
                 CT2/CT4 
                 0.74 
               
               
                 Fno 
                 1.50 
                 TD [mm] 
                 2.95 
               
               
                 HFOV [deg.] 
                 42.5 
                 TL/IH 
                 3.49 
               
               
                 Nd1 
                 1.642 
                 R1/R2 
                 1.86 
               
               
                 Vd1 
                 22.5 
                 R2/R7 
                 1.50 
               
               
                 Vd1/Vd2 
                 1.00 
                 R2/fd 
                 0.75 
               
               
                 Vd1/Vd3 
                 1.10 
                 R8/fd 
                 −8.87 
               
               
                 Vd1/Vd4 
                 0.40 
                 fd/fd3 
                 −1.16 
               
               
                 Vd2 
                 22.5 
                 I|d/fd3| + |fd/fd4| 
                 2.27 
               
               
                 Vd3 
                 20.4 
                 max (|fd/fd3|, |fd/fd4|) 
                 1.16 
               
               
                 Vd4 
                 56.0 
                 (|1/1d| + |1/fd2|)/(|1/fd3| + |1/fd4|) 
                 0.68 
               
               
                 ΣVd 
                 121.4 
                 SL/TL 
                 0.69 
               
               
                 CT1/T12 
                 3.12 
               
               
                   
               
            
           
         
       
     
     13th Embodiment 
       FIG.  26 A  is a schematic view of a sensing module  1300  of an electronic device  10  according to the 13th embodiment of the present disclosure.  FIG.  26 B  is a schematic view of an appearance of one side of the electronic device  10  according to the 13th embodiment of the present disclosure.  FIG.  26 C  is a schematic view of an appearance of the other side of the electronic device  10  according to the 13th embodiment of the present disclosure. In  FIGS.  26 A,  26 B and  26 C , the electronic device  10  according to the 13th embodiment is a tablet, which includes the sensing module  1300 , an image capturing apparatus  11  and a display apparatus  12 . 
     The sensing module  1300  includes a projection apparatus  1310 , a receiving apparatus  1320  and a processor  1330 , wherein the projection apparatus  1310  and the receiving apparatus  1320  are connected to the processor  1330 . The projection apparatus  1310  includes the optical lens assembly (its reference numeral is omitted) according to the aforementioned 12th embodiment and at least one light source  1311 , wherein the optical lens assembly includes, in order from an outside to an inside (that is, from a magnification side to a reduction side of the projection apparatus  1310 ), the first lens element  1210 , the aperture stop  1200 , the second lens element  1220 , the third lens element  1230 , the fourth lens element  1240  and the inside conjugation surface  1260 , and the light source  1311  can be composed by a laser array, and can be vertical cavity surface emitting laser, which is disposed on the inside conjugation surface  1260  of the optical lens assembly. The receiving apparatus  1320  includes the optical lens assembly (its reference numeral is omitted) according to the aforementioned 11th embodiment and an image sensor  1321 , wherein the optical lens assembly includes, in order from an outside to an inside (that is, from an object side to an image side of the receiving apparatus  1320 ), the aperture stop  1100 , the first lens element  1110 , the second lens element  1120 , the third lens element  1130 , the fourth lens element  1140 , the filter  1150  and the inside conjugation surface  1160 , and the image sensor  1321  is disposed on the inside conjugation surface  1160  of the optical lens assembly. 
     The light of the light source  1311  of the projection apparatus  1310  passes through the optical lens assembly thereof so as to form into a structured light and project on a sensed object  13   a . The receiving apparatus  1320  receives the reflective light from the sensed object  13   a , images on the image sensor  1321 , and the received information can be calculated by the processor  1330  so as to obtain the relative distance of each portion of the sensed object  13   a , further obtain the 3D-shaped variation on the surface of the sensed object  13   a.    
     In the 13th embodiment, the projection apparatus  1310  and the receiving apparatus  1320  (including the optical lens assemblies, the light source  1311  and the image sensor  1321 ) can be applied to the infrared band (780 nm-1500 nm) so as to decrease the interference from the visible light and enhance the sensing precision. In the 13th embodiment, the projection apparatus  1310  and the receiving apparatus  1320  can be further applied to the narrow-band infrared (930 nm-950 nm) so as to decrease the noise interference. 
     The image capturing apparatus  11  includes the optical lens assembly (its reference numeral is omitted) according to the aforementioned 10th embodiment and an image sensor (its reference numeral is omitted) disposed on the inside conjugation surface  1060 , wherein the image capturing apparatus  11  can be applied to the visible light (400 nm-700 nm). 
     The sensed object  13   a  can include the surrounding environment, the sensing module  1300  can be matched with the image capturing apparatus  11  and the display apparatus  12  so as to apply but not limited to the augmented reality function, so that users can interact with the surrounding environment. 
     Furthermore, in the 13th embodiment, the projection apparatus  1310  includes the optical lens assembly according to the aforementioned 12th embodiment and the receiving apparatus  1320  includes the optical lens assembly according to the aforementioned 11th embodiment, but the present disclosure will not be limited thereto. The projection apparatus  1310  and the receiving apparatus  1320  can include other optical lens assembly, such as, the projection apparatus  1310  can include the optical lens assembly according to the aforementioned 3rd embodiment, and the receiving apparatus  1320  can include the optical lens assembly according to the aforementioned 2nd embodiment, and will not detailed describe herein. 
     14th Embodiment 
       FIG.  27 A  is a schematic view of an appearance of the using state of an electronic device  20  according to the 14th embodiment of the present disclosure.  FIG.  27 B  is a schematic view of a sensing module  1400  of the electronic device  20  according to the 14th embodiment of the present disclosure. According to the 14th embodiment, the electronic device  20  is a smartphone, which includes the sensing module  1400 , an image capturing apparatus  21  and a display apparatus  22 . 
     The sensing module  1400  includes a projection apparatus  1410 , a receiving apparatus  1420  and a processor  1430 , wherein the projection apparatus  1410  and the receiving apparatus  1420  are connected to the processor  1430 . According to the 14th embodiment, the projection apparatus  1410  includes an optical lens assembly  1411  and a light source  1412 , the receiving apparatus  1420  includes an optical lens assembly  1421  and an image sensor  1422 , wherein the connecting relationship and functions of the projection apparatus  1410 , the receiving apparatus  1420  and the processor  1430  can be the same with the projection apparatus  1310 , the receiving apparatus  1320  and the processor  1330  stated in the 13th embodiment, and will not describe again herein. 
     The sensing module  1400  can be applied to face recognition function, in  FIG.  27 B , the light source  1412  can be composed by a laser array  1412   a , which can form structured light with the optical lens assembly  1411  of the projection apparatus  1410 , and project on an sensed object  14   a , wherein the sensed object  14   a  is shown without an array image of projection, and the sensed object  14   b  is shown with an array image of projection. The optical lens assembly  1421  of the receiving apparatus  1420  receives the reflective light from the sensed object  14   b , images on the image sensor  1422 , and the received image  1422   a  can be calculated by the processor  1430  so as to obtain the relative distance of each portion of the sensed object  14   b , further obtain the 3D-shaped variation on the surface of the sensed object  14   b . Therefore, the security of the electronic device  20  in usage can be enhanced, but is not limited thereto. The image capturing apparatus  21  can be utilized to photographing, and can be matched to the sensing module  1400 , wherein the obtained information of the receiving apparatus  1420  and the image capturing apparatus  21  can be shown on the display apparatus  22  after processing. 
     15th Embodiment 
       FIG.  28    is a schematic view of an electronic device  30  according to the 15th embodiment of the present disclosure. In the 15th embodiment, the electronic device  30  includes a sensing module (its reference numeral is omitted), an image capturing apparatus  31  and a display apparatus  32 . 
     The sensing module includes a projection apparatus  1510 , a receiving apparatus  1520  and a processor  1530 , wherein the projection apparatus  1510  and the receiving apparatus  1520  are connected to the processor  1530 . According to the 15th embodiment, the connecting relationship and functions of the projection apparatus  1510 , the receiving apparatus  1520  and the processor  1530  can be the same with the projection apparatus  1310 , the receiving apparatus  1320  and the processor  1330  stated in the 13th embodiment, and will not describe again herein. 
     According to the 15th embodiment, the sensing module can be utilized to capture the dynamic variation of the sensed object  33  so as to implement human-computer interaction, but is not limited thereto. The image capturing apparatus  31  can be utilized to photographing, and can be matched to the sensing module, wherein the obtained information of the receiving apparatus  1520  and the image capturing apparatus  31  can be shown on the display apparatus  32  after processing. 
     The foregoing description, for purpose of explanation, has been described with reference to specific embodiments. It is to be noted that Tables show different data of the different embodiments; however, the data of the different embodiments are obtained from experiments. The embodiments were chosen and described in order to best explain the principles of the disclosure and its practical applications, to thereby enable others skilled in the art to best utilize the disclosure and various embodiments with various modifications as are suited to the particular use contemplated. The embodiments depicted above and the appended drawings are exemplary and are not intended to be exhaustive or to limit the scope of the present disclosure to the precise forms disclosed. Many modifications and variations are possible in view of the above teachings.