Imaging optical lens assembly, imaging apparatus and electronic device

An imaging optical lens assembly includes five optical elements with refractive power. The five optical elements, in order from an object side to an image side along an optical path, are a first optical element, a second optical element, a third optical element, a fourth optical element, and a fifth optical element. The first optical element has an object-side surface being concave in a paraxial region thereof. The third optical element has negative refractive power.

RELATED APPLICATIONS

This application claims priority to Taiwan Application Serial Number 109114814, filed on May 4, 2020, which is incorporated by reference herein in its entirety.

BACKGROUND

Technical Field

The present disclosure relates to an imaging optical lens assembly and an imaging apparatus, and more particularly, to an imaging optical lens assembly and an imaging apparatus applicable to electronic devices.

Description of Related Art

As the applications of camera modules are becoming more and more extensive, installing a camera module in various smart electronic products such as car devices, identification systems, entertainment devices, sports devices and smart home systems is a major trend for future technology development. In order to provide more extensive user experiences, smart devices equipped with one, two, three or even more lenses have gradually become the mainstream on the market. In response to different application needs, optical systems with different optical properties have been developed.

With the rapid technology development, the application range of electronic devices equipped with an imaging optical system is more extensive, and the requirements for the imaging optical system are also more diversified. As a conventional imaging optical system is unable to meet the current demands, there is a need for an imaging optical system capable of balancing between the requirements such as imaging quality, sensitivity, aperture size, volume, or angle of view.

SUMMARY

According to one aspect of the present disclosure, an imaging optical lens assembly includes five optical elements with refractive power. The five optical elements, in order from an object side to an image side along an optical path, are a first optical element, a second optical element, a third optical element, a fourth optical element, and a fifth optical element.

The first optical element has an object-side surface being concave in a paraxial region thereof. The third optical element has negative refractive power. A sum of axial thicknesses of the first optical element, the second optical element, the third optical element, the fourth optical element, and the fifth optical element along the optical path is ΣCT, an axial thickness of the first optical element along the optical path is CT1, and the following condition is satisfied:
ΣCT/CT1<2.30.

According to another aspect of the present disclosure, an imaging optical lens assembly includes five optical elements with refractive power. The five optical elements, in order from an object side to an image side along an optical path, are a first optical element, a second optical element, a third optical element, a fourth optical element, and a fifth optical element.

The first optical element has an object-side surface being concave in a paraxial region thereof. The first optical element has an image-side surface being convex in a paraxial region thereof. The third optical element has negative refractive power. The fifth optical element has an image-side surface being concave thereof. A sum of axial thicknesses of the first optical element, the second optical element, the third optical element, the fourth optical element, and the fifth optical element along the optical path is ΣCT, an axial thickness of the first optical element along the optical path is CT1, and the following condition is satisfied:
ΣCT/CT1<3.0.

According to another aspect of the present disclosure, an imaging optical lens assembly includes five optical elements with refractive power. The five optical elements, in order from an object side to an image side along an optical path, are a first optical element, a second optical element, a third optical element, a fourth optical element, and a fifth optical element.

The first optical element has an object-side surface being concave in a paraxial region thereof. The first optical element includes a reflective surface. A sum of axial thicknesses of the first optical element, the second optical element, the third optical element, the fourth optical element, and the fifth optical element along the optical path is ΣCT, an axial thickness of the first optical element along the optical path is CT1, and the following condition is satisfied:
ΣCT/CT1<3.0.

According to another aspect of the present disclosure, an imaging optical lens assembly includes a plurality of optical elements with refractive power.

At least one of the optical elements with refractive power includes a reflective surface, is made of cyclo olefin polymer material, and has an object-side surface being concave in a paraxial region thereof.

According to another aspect of the present disclosure, an imaging apparatus includes the aforementioned imaging optical lens assembly and an image sensor.

According to another aspect of the present disclosure, an electronic device includes at least three imaging apparatuses. The three imaging apparatuses include the aforementioned imaging apparatus. The three imaging apparatuses face the same direction. A maximum angle of view among the three imaging apparatuses is FOVmax, a minimum angle of view among the three imaging apparatuses is FOVmin, and the following condition is satisfied:
40<FOV max−FOV min.

DETAILED DESCRIPTION

In recent years, the miniaturization of electronic devices is becoming a trend. However, it is difficult for conventional imaging lenses to meet the requirements of high specifications and miniaturization concurrently, especially the compact lens systems with large apertures or telephoto features. Furthermore, as the demand and standard for optical zoom features have become higher (such as increased zoom ratios, etc.), the conventional telephoto lens systems are unable to meet the demand (with an overly long total length, an overly small aperture, insufficient imaging quality or lack of miniaturization). As such, different optical configurations with folded optical axis are required to solve the aforementioned problems. Due to the thickness limitation of electronic devices, some optical lens systems have lens barrels or lens elements trimmed to remove the portions that are not used for imaging so as to reduce the size of the lens system in one dimension. Reflective elements can be used to provide the thickness reduction and a sufficient total length for telephoto configurations.

The present disclosure provides an imaging optical lens assembly including five optical elements. The five optical elements, in order from an object side to an image side along an optical path, are a first optical element, a second optical element, a third optical element, a fourth optical element, and a fifth optical element.

The first optical element may have positive refractive power so as to reduce the total length of the imaging optical lens assembly. The first optical element has an object-side surface being concave in a paraxial region thereof so as to adjust incident light from larger angles of view. The first optical element may have an image-side surface being convex in a paraxial region thereof so as to favorably correct aberrations. The first optical element may include a reflective surface, which can further provide the functionality of a reflective element, is favorable for imaging, and can also reduce the size of the first optical element and the required total thickness of the camera module, which will be applicable in thin and compact electronic devices. The first optical element may have both the object-side surface and the image-side surface being spherical so as to simplify manufacturing and improve the yield rates.

The second optical element may have positive refractive power so as to provide significant converging abilities such that the imaging optical lens assembly can be effectively miniaturized.

The third optical element may have negative refractive power so as to favorably correct aberrations from the second optical element.

The fifth optical element may have an image-side surface being concave in a paraxial region thereof so as to effectively control the back focal length and adjust the incident angle of the chief ray on the image surface. The fifth optical element may have an object-side surface being convex in a paraxial region thereof so as to improve astigmatism correction.

The first optical element, the second optical element, the third optical element, the fourth optical element and the fifth optical element may all be made of plastic so as to reduce the weight and the manufacturing cost of the imaging optical lens assembly.

A sum of axial thicknesses of the first optical element, the second optical element, the third optical element, the fourth optical element, and the fifth optical element along the optical path is ΣCT, and an axial thickness of the first optical element along the optical path is CT1. When the imaging optical lens assembly satisfies the following condition: ΣCT/CT1<3.0, it is favorable for the first optical element having a sufficient thickness to fold the optical path. Moreover, the following condition can be satisfied: ΣCT/CT1<2.50. Moreover, the following condition can be satisfied: ΣCT/CT1<2.30. Moreover, the following condition can be satisfied: ΣCT/CT1<2.0.

A focal length of the imaging optical lens assembly is f, a focal length of the second optical element is f2, and a focal length of the third optical element is f3. When the imaging optical lens assembly satisfies the following condition: 3.0<|f/f2|+|f/f3|<6.0, it is favorable for providing sufficient refractive power in the middle section of the optical system so as to balance the total length of the imaging optical lens assembly and imaging quality.

A focal length of the first optical element is f1, the focal length of the second optical element is f2, the focal length of the third optical element is f3, a focal length of the fourth optical element is f4, and a focal length of the fifth optical element is f5. When the imaging optical lens assembly satisfies the following condition: |f2/f1|<0.75; |f2/f4|<0.75; |f2/f5|<0.75; |f3/f1|<0.75; |f3/f4|<0.75; |f3/f5|<0.75, it is favorable for having sufficient refractive power in the middle section of the optical system so as to reduce the total length of the imaging optical lens assembly.

The focal length of the second optical element is f2, and the focal length of the third optical element is f3. When the imaging optical lens assembly satisfies the following condition: |f3/f2|<1.0, the refractive power between the second optical element and the third optical element can be balanced.

The focal length of the imaging optical lens assembly is f, a curvature radius of an object-side surface of the second optical element is R3, and a curvature radius of an image-side surface of the third optical element is R6. When the imaging optical lens assembly satisfies the following condition: (f/R3)+(f/R6), it is favorable for correcting aberrations so as to improve imaging quality.

The focal length of the imaging optical lens assembly is f, and the focal length of the first optical element is f1. When the imaging optical lens assembly satisfies the following condition: 0.03<f/f1<0.40, it is favorable for balancing the refractive power and the manufacturing complexity of the first optical element.

The focal length of the imaging optical lens assembly is f, a curvature radius of the object-side surface of the first optical element is R1, and a curvature radius of the image-side surface of the first optical element is R2. When the imaging optical lens assembly satisfies the following condition: 0.50<|f/R1|+|f/R2|<2.50, the lens surfaces of the first optical element can have suitable shapes so as to reduce the difficulty in manufacturing and increase the yield rate. Moreover, the following condition can be satisfied: 0.75<|f/R1|+|f/R2|<1.60.

An axial distance between an object-side surface of the second optical element and the image-side surface of the fifth optical element along the optical path is Dr3r10, an axial distance between the image-side surface of the fifth optical element and an image surface along the optical path is BL. When the imaging optical lens assembly satisfies the following condition: Dr3r10/BL<1.0, there is enough space between the lens and the imaging surface for disposing optical path folding or other optical elements, which will provide a wider range of functions and applications.

An axial thickness of the second optical element along the optical path is CT2, and an axial thickness of the third optical element along the optical path is CT3. When the imaging optical lens assembly satisfies the following condition: CT2/CT3<2.0, it is favorable for enhancing the structural strength of the second optical element and the third optical element.

An axial distance between the object-side surface of the first optical element and the image surface along the optical path remains the same while the imaging optical lens assembly is focusing such that the total length of the imaging optical lens can be limited, and it is favorable for the design and configuration of the optical elements of the imaging optical lens assembly.

An Abbe number of an optical element with refractive power is V, and a refractive index of the optical element with refractive power is N. When at least one optical element of the imaging optical lens assembly satisfies the following condition: 5.0<V/N<12.0, corrections of chromatic aberrations and astigmatism can be balanced and the effective radius of the optical element can be favorably reduced so as to improve the miniaturization of the optical lens assembly.

An f-number of the imaging optical lens assembly is Fno. When the imaging optical lens assembly satisfies the following condition: 2.0<Fno<4.0, the aperture can be effective increased to enhance photographic functions in low-light conditions.

An axial thickness of the second optical element along the optical path is CT2, an axial thickness of the third optical element along the optical path is CT3, an axial thickness of the fourth optical element along the optical path is CT4, and an axial thickness of the fifth optical element along the optical path is CT5. When the imaging optical lens assembly satisfies the following condition: 2.0<(CT2+CT3)/(CT4+CT5), it is favorable for increasing the thicknesses of the second optical element and the third optical element and thereby enhancing the structural strength thereof. Moreover, the following condition can be satisfied: 2.75<(CT2+CT3)/(CT4+CT5).

A focal length of the imaging optical lens assembly is f, a curvature radius of an object-side surface of the fifth optical element is R9, and a curvature radius of an image-side surface of the fifth optical element is R10. When the imaging optical lens assembly satisfies the following condition: 7.0<(f/R9)+(f/R10), the exit pupil can be shifted toward the object side so as to favorably reduce the expansion speed of light beams after passing through the lens for miniaturization of the lens module.

A maximum vertical distance between a point on an effective optical region of the object-side surface of the second optical element and an optical axis is Y2R1, and a maximum vertical distance between a point on an effective optical region of the image-side surface of the fifth optical element and the optical axis is Y5R2. When the imaging optical lens assembly satisfies the following condition: 0.90<Y2R1/Y5R2<1.25, the beam size can be favorably controlled so as to avoid an overly large effective radius of the optical elements which will negatively affect the lens miniaturization.

The glass transition temperature of the material of the first optical element is Tg1, and a refractive index of the first optical element is N1. When the imaging optical lens assembly satisfies the following condition: 92.5<Tg1/N1<105, the selection of a proper material for the first optical element can increase the yield rate thereof.

The present disclosure provides an imaging optical lens assembly, including a plurality of optical elements with refractive power. At least one optical element with refractive power includes a reflective surface. The at least one optical element with refractive power is made of cyclo olefin polymer material. The at least one optical element with refractive power has an object-side surface being concave in a paraxial region thereof. As such, the imaging optical lens assembly will not only improve the imaging function, but also reduce the thickness required for the camera module such that the module can be utilized in a thin and compact electronic device.

The glass transition temperature of the at least one optical element with refractive power is Tg, and a refractive index of the at least one optical element with refractive power is N. When the imaging optical lens assembly satisfies the following condition: 92.5<Tg/N<100, proper materials can be selected so as to provide sufficient refractive power and increase the yield rate of manufacturing.

Please refer toFIG.12, which is a schematic view of focusing according to the 1st embodiment of the present disclosure. The imaging optical lens assembly of the present disclosure may begin focusing by moving the imaging optical lens assembly ZM, which includes the aperture100, the second optical element120, the third optical element130, the fourth optical element140and the fifth optical element150, along the optical axis by a distance X while changing the distance between the first optical element110′ and the second optical element120. As such, an axial distance between the image-side surface112′ of the first optical element110′ and the image surface180along the optical path remains the same while focusing.

The present disclosure further provides an imaging apparatus, including the aforementioned imaging optical lens assembly and an image sensor.

The present disclosure further provides an electronic device, including at least three imaging apparatuses. The three imaging apparatuses include the aforementioned imaging apparatus. The three imaging apparatuses face the same direction. A maximum angle of view among the three imaging apparatuses is FOVmax, and a minimum angle of view among the three imaging apparatuses is FOVmin. When the electronic device satisfies the following condition: 40<FOVmax−FOVmin, it can meet the requirements for providing a combined telephoto and wide view angle configuration for imaging. Moreover, the following condition can be satisfied: 60<FOVmax−FOVmin.

At least one of the three imaging apparatuses may include two reflective surfaces. Each of at least two of the three imaging apparatuses may include at least one reflective surface, respectively, such that the optical path can be folded which allows more flexible configurations of the imaging apparatus.

Please refer toFIG.13A, which is a schematic view of an imaging apparatus including two reflective surfaces according to the 1st embodiment of the present disclosure as an example. As shown, the first optical element110′ is a prism including a reflective surface113′ such that an optical axis AX1and an optical axis AX2will form an angle of 90 degrees. The prism160′ includes a reflective surface163′ such that the optical axis AX2and an optical axis AX3will form an angle of 90 degrees. The reflective surface113′ of the first optical element110′ in the imaging apparatus is disposed to be in parallel with the reflective surface163′ of the prism160′ such that the optical axis AX1is in parallel with the optical axis AX3and light will travel in the same direction along the optical axis AX1and AX3.

Please refer toFIG.13B, which is a schematic view of an imaging apparatus including two reflective surfaces according to the 1st embodiment of the present disclosure as an example. As shown, the first optical element110′ is a prism including a reflective surface113′ such that an optical axis AX1and an optical axis AX2will form an angle of 90 degrees. The prism160′ includes a reflective surface163′ such that the optical axis AX2and an optical axis AX3will form an angle of 90 degrees. The reflective surface113′ of the first optical element110′ in the imaging apparatus is disposed to be perpendicular with the reflective surface163′ of the prism160′ such that the optical axis AX1is in parallel with the optical axis AX3and light will travel in an opposite direction along the optical axis AX1and AX3.

Please refer toFIG.14, which is a schematic view showing the parameter CT1 of a first optical element with a reflective surface according to the 1st embodiment of the present disclosure as an example. As shown, the length between the object side surface111′ of the first optical element110′ and the reflective surface113′ of the first optical element110′ along the optical axis AX1is CT1 a, the length between the reflective surface113′ of the first optical element110′ and the image side surface112′ of the first optical element110′ is along the optical axis AX2is CT1b, the axial thickness of the first optical element110′ along the optical path is CT1, and the following condition is satisfied: CT1=CT1a+CT1b.

Each of the aforementioned features of the imaging optical lens assembly can be utilized in numerous combinations, so as to achieve the corresponding effects.

According to the imaging optical lens assembly of the present disclosure, the object side and the image side is defined along the optical path. The parameters such as ΣCT, which is a sum of axial thicknesses of the first optical element, the second optical element, the third optical element, the fourth optical element, and the fifth optical element along the optical path, and CT1, which is the axial thickness of the first optical element along the optical path, are calculated along the optical path when the optical axis is folded. In the imaging optical lens assembly of the present disclosure, parameters such as f, Fno, BL, and Y2R1 are calculated in a configuration with an object distance at infinity.

According to the imaging optical lens assembly of the present disclosure, the optical elements thereof can be made of glass or plastic material. When the optical elements are made of glass material, the distribution of the refractive power of the lens system may be more flexible to design and reduce the effect of external environmental temperature on imaging. Technologies such as grinding or molding can be used for producing glass optical elements. When the optical elements are made of plastic material, the manufacturing cost can be effectively reduced. Furthermore, surfaces of each optical element can be arranged to be spherical or aspheric (ASP). Arranging the spherical surfaces can reduce difficulties in manufacturing while arranging the aspheric surfaces can have more control variables for eliminating aberrations and to further decrease the required quantity of optical elements, the total track length of the imaging optical lens assembly can be effectively reduced. Process such as plastic injection molding or molded glass lens can be used for making the aspheric surfaces. The optical element in the present disclosure may be made of cyclo olefin polymer material and the cyclo olefin polymer may be a copolymer.

According to the imaging optical lens assembly of the present disclosure, if a surface of an optical element is aspheric, it means that the surface has an aspheric shape throughout its optical effective area, or a portion(s) thereof.

According to the imaging optical lens assembly of the present disclosure, additives may be selectively added to the material of any one (or more) optical element to change the transmittance of said optical element in a particular wavelength range of light, so as to further reduce stray light and chromatic aberrations. For example, an additive that can filter off light in the wavelength range of 600-800 nm may be added to reduce extra red or infrared light, or an additive that can filter off light in the wavelength range of 350-450 nm may be added to reduce blue or ultraviolet light in the optical elements. Thus, the additives can prevent unwanted disrupting light in particular wavelength ranges affecting the final image. In addition, additives may be evenly mixed in the plastic material for manufacturing optical elements with an injection molding process.

According to the imaging optical lens assembly of the present disclosure, the imaging optical lens assembly can include at least one stop, such as an aperture stop, a glare stop or a field stop, so as to favorably reduce the amount of stray light and thereby improving the image quality.

According to the imaging optical lens assembly of the present disclosure, an aperture stop can be configured as a front stop or a middle stop. The front stop disposed between an imaged object and the first optical element can provide a longer distance between an exit pupil of the imaging optical lens assembly and the image surface so that the generated telecentric effect can improve the image-sensing efficiency of an image sensor, such as a CCD or CMOS sensor. The middle stop disposed between the first optical element and the image surface is favorable for enlarging the field of view of the imaging optical lens assembly, thereby providing the imaging optical lens assembly with the advantage of a wide-angle lens.

Please refer toFIG.15, which is a schematic view showing a long side and a short side of an image sensor according to the imaging sensor of the present disclosure. As shown, the long side of the image sensor185is L and the short side of the image sensor185is S. The sectional view drawings of the image sensor illustrated in each embodiment of the present disclosure are drawn along the broken line A shown herewith.

An aperture control unit may be disposed in the imaging optical lens assembly of the present disclosure. The aperture control unit may be a mechanical part or optical moderation part, in which the size and shape of the aperture may be controlled by electricity or electronic signals. The mechanical part may include moving parts such as blades, shielding sheets, etc. The optical moderation part may include shielding materials such as filters, electrochromic materials, liquid crystal layers, etc. The aperture control unit can control the amount of incoming light and exposure time so as to further improve the image quality. Meanwhile, the aperture control unit may represent the aperture in the present disclosure that can adjust the image properties such as depth of field or exposure speed by changing the f-number of the imaging optical lens assembly.

According to the imaging optical lens assembly of the present disclosure, when the optical element has a convex surface and the region of convex shape is not specified, it indicates that the surface can be convex in the paraxial region thereof. When the optical element has a concave surface and the region of concave shape is not specified, it indicates that the surface can be concave in the paraxial region thereof. Likewise, when the region of refractive power or focal length of an optical element is not specified, it indicates that the region of refractive power or focal length of the optical element can be in the paraxial region thereof.

According to the imaging optical lens assembly of the present disclosure, the image surface of the imaging optical lens assembly, based on the corresponding image sensor, can be a plane or a curved surface with an arbitrary curvature, especially a curved surface being concave facing towards the object side. Meanwhile, the imaging optical lens assembly of the present disclosure may optionally include one or more image correction components (such as a field flattener) between the image surface and the optical element closest to the image surface for the purpose of image corrections (such as field curvature correction). The optical properties of the image correction components such as curvatures, thicknesses, indices, positions and shapes (convex or concave, spherical or aspheric, diffractive surface and Fresnel surface, etc.) can be adjusted according to the requirement of the imaging apparatus. Preferably, an image correction component may be a thin plano-concave component with a surface being concave toward the object side arranged near the image surface.

In the imaging optical lens assembly of the present disclosure, at least one reflective element capable of folding the optical path such as a prism or a reflective mirror can be alternatively disposed on the optical path between the object and the image surface so as to provide the imaging optical lens assembly with even more flexibilities in configurations such that the miniaturization of the electronic device will not be restricted by the total length of the imaging optical lens assembly.

FIG.1Ais a schematic view of an imaging apparatus according to the 1st embodiment of the present disclosure.FIG.1Bis a schematic view of an imaging apparatus with reflective surfaces equivalent to the 1st embodiment of the present disclosure.FIG.1Cshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 1st embodiment.

InFIG.1A, the imaging apparatus includes an imaging optical lens assembly (not otherwise herein labeled) of the present disclosure and an image sensor185. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first optical element110, an aperture stop100, a second optical element120, a third optical element130, a fourth optical element140, a fifth optical element150, a prism160, a filter170, and an image surface180. There is no additional optical element inserted between the first optical element110and the fifth optical element150. There are air gaps between paraxial regions of the first optical element110, the second optical element120, the third optical element130, the fourth optical element140, and the fifth optical element150.

The first optical element110with positive refractive power has an object-side surface111being concave in the paraxial region thereof, and an image-side surface112being convex in the paraxial region thereof. Both the object-side surface111and the image-side surface112are spherical. The first optical element110is made of plastic material.

The second optical element120with positive refractive power has an object-side surface121being convex in the paraxial region thereof, and an image-side surface122being convex in the paraxial region thereof. Both the object-side surface121and the image-side surface122are aspheric. The second optical element120is made of plastic material.

The third optical element130with negative refractive power has an object-side surface131being concave in the paraxial region thereof, and an image-side surface132being concave in the paraxial region thereof. Both the object-side surface131and the image-side surface132are aspheric. The third optical element130is made of plastic material.

The fourth optical element140with negative refractive power has an object-side surface141being concave in the paraxial region thereof, and an image-side surface142being convex in the paraxial region thereof. Both the object-side surface141and the image-side surface142are aspheric. The fourth optical element140is made of plastic material.

The fifth optical element150with positive refractive power has an object-side surface151being convex in the paraxial region thereof, and an image-side surface152being concave in the paraxial region thereof. Both the object-side surface151and the image-side surface152are aspheric. The fifth optical element150is made of plastic material.

The prism160is disposed between the fifth optical element150and the filter170. The prism160is made of glass material. The filter170is disposed between the prism160and the image surface180. The filter170is made of glass material and does not affect the focal length of the imaging optical lens assembly. The image sensor185is disposed on the image surface180of the imaging optical lens assembly.

FIG.1Bis a schematic view of an imaging apparatus with reflective surfaces equivalent to the 1st embodiment of the present disclosure. InFIG.1B, a first optical element110′ is a prism including a reflective surface113′ so as to fold the optical path by 90 degrees. An object-side surface111′ of the first optical element110′ corresponds to the object-side surface111of the first optical element110and an image-side surface112′ of the first optical element110′ corresponds to the image-side surface112of the first optical element110such that the overall optical properties of the first optical element110′ are equivalent to those of the first optical element110shown inFIG.1A. A prism160′ includes a reflective surface163′ such that the overall optical properties of the prism160′ are equivalent to those of the prism160shown inFIG.1A. According to the aforementioned configuration, an imaging apparatus equivalent to the 1st embodiment with the optical path being folded can be obtained.

The detailed optical data of the 1st embodiment are shown in TABLE 1, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, f is a focal length of the imaging optical lens assembly, Fno is an f-number of the imaging optical lens assembly, HFOV is a half of the maximal field of view, and surfaces #0 to #16 refer to the surfaces in order from the object side to the image side. The aspheric surface data are shown in TABLE 2, wherein k is the conic coefficient in the equation of the aspheric surface profiles, and A4-A20 refer to the 4th to 20th order aspheric coefficients.

Further, it should be noted that the tables shown in each of the following embodiments are associated with the schematic view and diagrams of longitudinal spherical aberration curves, astigmatic field curves and a distortion curve for the respective embodiment. Also, the definitions of the parameters presented in later tables are the same as those of the parameters presented in TABLE 1 and TABLE 2 for the 1st embodiment. Explanations in this regard will not be provided again.

The equation of the aspheric surface profiles is expressed as follows:

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 profile to the optical axis;

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient.

In the 1st embodiment, the focal length of the imaging optical lens assembly is f, the f-number of the imaging optical lens assembly is Fno, and the half of the maximal field of view of the imaging optical lens assembly is HFOV. These parameters have the following values: f=10.49 mm; Fno=2.40; and HFOV=13.5 degrees.

In the 1st embodiment, a maximum vertical distance between a point on an effective optical region of the object-side surface121of the second optical element120and an optical axis is Y2R1, and it satisfies the condition: Y2R1=2.30.

In the 1st embodiment, a maximum vertical distance between a point on an effective optical region of the image-side surface152of the fifth optical element150and the optical axis is Y5R2, and it satisfies the condition: Y5R2=1.96.

In the 1st embodiment, an Abbe number of the first optical element110is V1, a refractive index of the first optical element110is N1, and they satisfy the condition: V1/N1=10.90.

In the 1st embodiment, an Abbe number of the second optical element120is V2, a refractive index of the second optical element120is N2, and they satisfy the condition: V2/N2=36.26.

In the 1st embodiment, an Abbe number of the third optical element130is V3, a refractive index of the third optical element130is N3, and they satisfy the condition: V3/N3=13.70.

In the 1st embodiment, an Abbe number of the fourth optical element140is V4, a refractive index of the fourth optical element140is N4, and they satisfy the condition: V4/N4=10.90.

In the 1st embodiment, an Abbe number of the fifth optical element150is V5, a refractive index of the fifth optical element150is N5, and they satisfy the condition: V5/N5=36.26.

In the 1st embodiment, the glass transition temperature of the material of the first optical element110is Tg1, and it satisfies the condition: Tg1=153 (° C.).

In the 1st embodiment, the glass transition temperature of the material of the first optical element110is Tg1, the refractive index of the first optical element110is N1, and they satisfy the condition: Tg1/N1=90.74.

In the 1st embodiment, the maximum vertical distance between a point on the effective optical region of the object-side surface121of the second optical element120and the optical axis is Y2R1, the maximum vertical distance between a point on the effective optical region of the image-side surface152of the fifth optical element150and the optical axis is Y5R2, and they satisfy the condition: Y2R1/Y5R2=1.17.

In the 1st embodiment, an axial thickness of the second optical element120along the optical path is CT2, an axial thickness of the third optical element130along the optical path is CT3, and they satisfy the condition: CT2/CT3=1.63.

In the 1st embodiment, the axial thickness of the second optical element120along the optical path is CT2, the axial thickness of the third optical element130along the optical path is CT3, an axial thickness of the fourth optical element140along the optical path is CT4, an axial thickness of the fifth optical element150along the optical path is CT5, and they satisfy the condition: (CT2+CT3)/(CT4+CT5)=3.14.

In the 1st embodiment, a sum of axial thicknesses of the first optical element110, the second optical element120, the third optical element130, the fourth optical element140, and the fifth optical element150along the optical path is ΣCT, an axial thickness of the first optical element110along the optical path is CT1, and they satisfy the condition: ΣCT/CT1=1.64.

In the 1st embodiment, an axial distance between the object-side surface121of the second optical element120and the image-side surface152of the fifth optical element150along the optical path is Dr3r10, an axial distance between the image-side surface152of the fifth optical element150and the image surface180along the optical path is BL, and they satisfy the condition: Dr3r10/BL=0.73.

In the 1st embodiment, the focal length of the imaging optical lens assembly is f, a curvature radius of the object-side surface111of the first optical element110is R1, a curvature radius of the image-side surface112of the first optical element110is R2, and they satisfy the condition: |f/R1|+|f/R2|=0.98.

In the 1st embodiment, the focal length of the imaging optical lens assembly is f, a curvature radius of the object-side surface121of the second optical element120is R3, a curvature radius of the image-side surface122of the third optical element130is R6, and they satisfy the condition: (f/R3)+(f/R6)=6.13.

In the 1st embodiment, the focal length of the imaging optical lens assembly is f, a curvature radius of the object-side surface151of the fifth optical element150is R9, a curvature radius of the image-side surface152of the fifth optical element150is R10, and they satisfy the condition: (f/R9)+(f/R10)=7.70.

In the 1st embodiment, a focal length of the first optical element110is f1, a focal length of the second optical element120is f2, and they satisfy the condition: |f2/f1|=0.14.

In the 1st embodiment, the focal length of the second optical element120is f2, a focal length of the fourth optical element140is f4, and they satisfy the condition: |f2/f4|=0.02.

In the 1st embodiment, the focal length of the second optical element120is f2, a focal length of the fifth optical element150is f5, and they satisfy the condition: |f2/f5|=0.44.

In the 1st embodiment, the focal length of the first optical element110is f1, a focal length of the third optical element130is f3, and they satisfy the condition: |f3/f1|=0.11.

In the 1st embodiment, the focal length of the second optical element120is f2, the focal length of the third optical element130is f3, and they satisfy the condition: |f3/f2|=0.74.

In the 1st embodiment, the focal length of the third optical element130is f3, the focal length of the fourth optical element140is f4, and they satisfy the condition: |f3/f4|=0.02.

In the 1st embodiment, the focal length of the third optical element130is f3, the focal length of the fifth optical element150is f5, and they satisfy the condition: |f3/f5|=0.32.

In the 1st embodiment, the focal length of the imaging optical lens assembly is f, the focal length of the first optical element110is f1, and they satisfy the condition: f/f1=0.24.

In the 1st embodiment, the focal length of the imaging optical lens assembly is f, the focal length of the second optical element120is f2, the focal length of the third optical element130is f3, and they satisfy the condition: |f/f2|+|f/f3|=4.02.

FIG.2Ais a schematic view of an imaging apparatus in a first zoom state according to the 2nd embodiment of the present disclosure.FIG.2Bis a schematic view of an imaging apparatus with reflective surfaces in a first zoom state equivalent to the 2nd embodiment of the present disclosure.FIG.2Cshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus in the first zoom state according to the 2nd embodiment.

InFIG.2A, the imaging apparatus includes an imaging optical lens assembly (not otherwise herein labeled) of the present disclosure and an image sensor285. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first optical element210, an aperture stop200, a second optical element220, a third optical element230, a fourth optical element240, a fifth optical element250, a prism260, a filter270, and an image surface280. There is no additional optical element inserted between the first optical element210and the fifth optical element250. There are air gaps between paraxial regions of the first optical element210, the second optical element220, the third optical element230, the fourth optical element240, and the fifth optical element250.

The first optical element210with positive refractive power has an object-side surface211being concave in the paraxial region thereof, and an image-side surface212being convex in the paraxial region thereof. The object-side surface211is spherical and the image-side surface212is aspheric. The first optical element210is made of plastic material. In one embodiment of the present disclosure, the first optical element210is made of cyclo olefin polymer material and the cyclo olefin polymer may be a copolymer.

The second optical element220with positive refractive power has an object-side surface221being convex in the paraxial region thereof, and an image-side surface222being concave in the paraxial region thereof. Both the object-side surface221and the image-side surface222are aspheric. The second optical element220is made of plastic material.

The third optical element230with negative refractive power has an object-side surface231being convex in the paraxial region thereof, and an image-side surface232being concave in the paraxial region thereof. Both the object-side surface231and the image-side surface232are aspheric. The third optical element230is made of plastic material.

The fourth optical element240with negative refractive power has an object-side surface241being concave in the paraxial region thereof, and an image-side surface242being convex in the paraxial region thereof. Both the object-side surface241and the image-side surface242are aspheric. The fourth optical element240is made of plastic material.

The fifth optical element250with positive refractive power has an object-side surface251being convex in the paraxial region thereof, and an image-side surface252being concave in the paraxial region thereof. Both the object-side surface251and the image-side surface252are aspheric. The fifth optical element250is made of plastic material.

The prism260is disposed between the fifth optical element250and the filter270. The prism260is made of glass material. The filter270is disposed between the prism260and the image surface280. The filter270is made of glass material and will not affect the focal length of the imaging optical lens assembly. The image sensor285is disposed on the image surface280of the imaging optical lens assembly.

FIG.2Bis a schematic view of an imaging apparatus with reflective surfaces in a first zoom state equivalent to the 2nd embodiment of the present disclosure. InFIG.2B, a first optical element210′ is a prism including a reflective surface213′ so as to fold the optical path by 90 degrees. An object-side surface211′ of the first optical element210′ corresponds to the object-side surface211of the first optical element210and an image-side surface212′ of the first optical element210′ corresponds to the image-side surface212of the first optical element210such that the overall optical properties of the first optical element210′ are equivalent to those of the first optical element210shown inFIG.2A. A prism260′ includes a reflective surface263′ such that the overall optical properties of the prism260′ are equivalent to those of the prism260shown inFIG.2A. According to the aforementioned configuration, an imaging apparatus equivalent to the 2nd embodiment with the optical path being folded can be obtained.

FIG.2Dis a schematic view of an imaging apparatus in a second zoom state according to the 2nd embodiment of the present disclosure.FIG.2Eis a schematic view of an imaging apparatus with reflective surfaces in a second zoom state equivalent to the 2nd embodiment of the present disclosure.FIG.2Fshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus in a second zoom state according to the 2nd embodiment. The imaging apparatus according to the 2nd embodiment changes from the first zoom state into the second zoom state by changing the distance between the image-side surface212of the first optical element210and the stop200from 0.904 mm to 0.714 mm, and changing the distance between the filter270and the image surface280from 0.598 mm to 0.788 mm. As such, an axial distance between the image-side surface212of the first optical element210and the image surface280along the optical path remains the same while focusing. The configuration of the rest optical elements of the 2nd embodiment in the second zoom state is the same as that in the first zoom state.FIG.2Eis a schematic view of an imaging apparatus with reflective surfaces in a second zoom state equivalent to the 2nd embodiment of the present disclosure. All the descriptions thereto are the same as the aforementioned zoom state and explanations in this regard will not be provided again.

In the 2nd embodiment, the equation of the aspheric surface profiles of the aforementioned optical elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in table below 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 3 and TABLE 4 and satisfy the conditions stated in table below.

FIG.3Ais a schematic view of an imaging apparatus in a first zoom state according to the 3rd embodiment of the present disclosure.FIG.3Bis a schematic view of an imaging apparatus with reflective surfaces in a first zoom state equivalent to the 3rd embodiment of the present disclosure.FIG.3Cshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus in the first zoom state according to the 3rd embodiment.

InFIG.3A, the imaging apparatus includes an imaging optical lens assembly (not otherwise herein labeled) of the present disclosure and an image sensor385. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first optical element310, an aperture stop300, a second optical element320, a third optical element330, a fourth optical element340, a fifth optical element350, a prism360, a filter370, and an image surface380. There is no additional optical element inserted between the first optical element310and the fifth optical element350. There are air gaps between paraxial regions of the first optical element310, the second optical element320, the third optical element330, the fourth optical element340, and the fifth optical element350.

The first optical element310with positive refractive power has an object-side surface311being concave in the paraxial region thereof, and an image-side surface312being convex in the paraxial region thereof. Both the object-side surface311and the image-side surface312are aspheric. The first optical element310is made of plastic material. In one embodiment of the present disclosure, the first optical element310is made of cyclo olefin polymer material and the cyclo olefin polymer may be a copolymer.

The second optical element320with positive refractive power has an object-side surface321being convex in the paraxial region thereof, and an image-side surface322being convex in the paraxial region thereof. Both the object-side surface321and the image-side surface322are aspheric. The second optical element320is made of plastic material.

The third optical element330with negative refractive power has an object-side surface331being convex in the paraxial region thereof, and an image-side surface332being concave in the paraxial region thereof. Both the object-side surface331and the image-side surface332are aspheric. The third optical element330is made of plastic material.

The fourth optical element340with negative refractive power has an object-side surface341being concave in the paraxial region thereof, and an image-side surface342being convex in the paraxial region thereof. Both the object-side surface341and the image-side surface342are aspheric. The fourth optical element340is made of plastic material.

The fifth optical element350with positive refractive power has an object-side surface351being convex in the paraxial region thereof, and an image-side surface352being concave in the paraxial region thereof. Both the object-side surface351and the image-side surface352are aspheric. The fifth optical element350is made of plastic material.

The prism360is disposed between the fifth optical element350and the filter370. The prism360is made of glass material. The filter370is disposed between the prism360and the image surface380. The filter370is made of glass material and does not affect the focal length of the imaging optical lens assembly. The image sensor385is disposed on the image surface380of the imaging optical lens assembly.

FIG.3Bis a schematic view of an imaging apparatus with reflective surfaces in a first zoom state equivalent to the 3rd embodiment of the present disclosure. In FIG.3B, a first optical element310′ is a prism including a reflective surface313′ so as to fold the optical path by 90 degrees. An object-side surface311′ of the first optical element310′ corresponds to the object-side surface311of the first optical element310and an image-side surface312′ of the first optical element310′ corresponds to the image-side surface312of the first optical element310such that the overall optical properties of the first optical element310′ are equivalent to those of the first optical element310shown inFIG.3A. A prism360′ includes a reflective surface363′ such that the overall optical properties of the prism360′ are equivalent to those of the prism360shown inFIG.3A. According to the aforementioned configuration, an imaging apparatus equivalent to the 3rd embodiment with the optical path being folded can be obtained.

FIG.3Dis a schematic view of an imaging apparatus in a second zoom state according to the 3rd embodiment of the present disclosure.FIG.3Eis a schematic view of an imaging apparatus with reflective surfaces in a second zoom state equivalent to the 3rd embodiment of the present disclosure.FIG.3Fshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus in a second zoom state according to the 3rd embodiment. The imaging apparatus according to the 3rd embodiment changes from the first zoom state into the second zoom state by changing the distance between the image-side surface312of the first optical element310and the stop300from 0.984 mm to 0.797 mm, and changing the distance between the filter370and the image surface380from 0.601 mm to 0.808 mm. The configuration of the rest optical elements of the 3rd embodiment in the second zoom state is the same as that in the first zoom state.FIG.3Eis a schematic view of an imaging apparatus with reflective surfaces in a second zoom state equivalent to the 3rd embodiment of the present disclosure. All the descriptions thereto are the same as the aforementioned zoom state and explanations in this regard will not be provided again.

Moreover, these parameters can be calculated from TABLE 5 and TABLE 6 and satisfy the conditions stated in table below.

FIG.4Ais a schematic view of an imaging apparatus in a first zoom state according to the 4th embodiment of the present disclosure.FIG.4Bis a schematic view of an imaging apparatus with reflective surfaces in a first zoom state equivalent to the 4th embodiment of the present disclosure.FIG.4Cshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus in a first zoom state according to the 4th embodiment.

InFIG.4A, the imaging apparatus includes an imaging optical lens assembly (not otherwise herein labeled) of the present disclosure and an image sensor485. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first optical element410, an aperture stop400, a second optical element420, a third optical element430, a fourth optical element440, a fifth optical element450, a prism460, a filter470, and an image surface480. There is no additional optical element inserted between the first optical element410and the fifth optical element450. There are air gaps between paraxial regions of the first optical element410, the second optical element420, the third optical element430, the fourth optical element440, and the fifth optical element450.

The first optical element410with positive refractive power has an object-side surface411being concave in the paraxial region thereof, and an image-side surface412being convex in the paraxial region thereof. Both the object-side surface411and the image-side surface412are aspheric. The first optical element410is made of plastic material. In one embodiment of the present disclosure, the first optical element410is made of cyclo olefin polymer material and the cyclo olefin polymer may be a copolymer.

The second optical element420with positive refractive power has an object-side surface421being convex in the paraxial region thereof, and an image-side surface422being convex in the paraxial region thereof. Both the object-side surface421and the image-side surface422are aspheric. The second optical element420is made of plastic material.

The third optical element430with negative refractive power has an object-side surface431being convex in the paraxial region thereof, and an image-side surface432being concave in the paraxial region thereof. Both the object-side surface431and the image-side surface432are aspheric. The third optical element430is made of plastic material.

The fourth optical element440with negative refractive power has an object-side surface441being concave in the paraxial region thereof, and an image-side surface442being convex in the paraxial region thereof. Both the object-side surface441and the image-side surface442are aspheric. The fourth optical element440is made of plastic material.

The fifth optical element450with positive refractive power has an object-side surface451being convex in the paraxial region thereof, and an image-side surface452being concave in the paraxial region thereof. Both the object-side surface451and the image-side surface452are aspheric. The fifth optical element450is made of plastic material.

The prism460is disposed between the fifth optical element450and the filter470. The prism460is made of glass material. The filter470is disposed between the prism460and the image surface480. The filter470is made of glass material and does not affect the focal length of the imaging optical lens assembly. The image sensor485is disposed on the image surface480of the imaging optical lens assembly.

FIG.4Bis a schematic view of an imaging apparatus with reflective surfaces in a first zoom state equivalent to the 4th embodiment of the present disclosure. InFIG.4B, a first optical element410′ is a prism including a reflective surface413′ so as to fold the optical path by 90 degrees. An object-side surface411′ of the first optical element410′ corresponds to the object-side surface411of the first optical element410and an image-side surface412′ of the first optical element410′ corresponds to the image-side surface412of the first optical element410such that the overall optical properties of the first optical element410′ are equivalent to those of the first optical element410shown inFIG.4A. A prism460′ includes a reflective surface463′ such that the overall optical properties of the prism460′ are equivalent to those of the prism460shown inFIG.4A. According to the aforementioned configuration, an imaging apparatus equivalent to the 4th embodiment with the optical path being folded can be obtained.

FIG.4Dis a schematic view of an imaging apparatus in a second zoom state according to the 4th embodiment of the present disclosure.FIG.4Eis a schematic view of an imaging apparatus with reflective surfaces in a second zoom state equivalent to the 4th embodiment of the present disclosure.FIG.4Fshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus in a second zoom state according to the 4th embodiment. The imaging apparatus according to the 4th embodiment changes from the first zoom state into the second zoom state by changing the distance between the image-side surface412of the first optical element410and the stop400from 0.948 mm to 0.763 mm, and changing the distance between the filter470and the image surface480from 0.663 mm to 0.865 mm. The configuration of the rest optical elements of the 4th embodiment in the second zoom state is the same as that in the first zoom state.FIG.4Eis a schematic view of an imaging apparatus with reflective surfaces in a second zoom state equivalent to the 4th embodiment of the present disclosure. All the descriptions thereto are the same as the aforementioned zoom state and explanations in this regard will not be provided again.

In the 4th embodiment, the equation of the aspheric surface profiles of the aforementioned optical elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in table below 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 7 and TABLE 8 and satisfy the conditions stated in table below.

FIG.5Ais a schematic view of an imaging apparatus in a first zoom state according to the 5th embodiment of the present disclosure.FIG.5Bis a schematic view of an imaging apparatus with reflective surfaces in a first zoom state equivalent to the 5th embodiment of the present disclosure.FIG.5Cshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus in a first zoom state according to the 5th embodiment.

InFIG.5A, the imaging apparatus includes an imaging optical lens assembly (not otherwise herein labeled) of the present disclosure and an image sensor585. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first optical element510, an aperture stop500, a second optical element520, a third optical element530, a fourth optical element540, a fifth optical element550, a prism560, a filter570, and an image surface580. There is no additional optical element inserted between the first optical element510and the fifth optical element550. There are air gaps between paraxial regions of the first optical element510, the second optical element520, the third optical element530, the fourth optical element540, and the fifth optical element550.

The first optical element510with positive refractive power has an object-side surface511being concave in the paraxial region thereof, and an image-side surface512being convex in the paraxial region thereof. The object-side surface511is aspheric and the image-side surface512is spherical. The first optical element510is made of plastic material.

The second optical element520with positive refractive power has an object-side surface521being convex in the paraxial region thereof, and an image-side surface522being convex in the paraxial region thereof. Both the object-side surface521and the image-side surface522are aspheric. The second optical element520is made of plastic material.

The third optical element530with negative refractive power has an object-side surface531being concave in the paraxial region thereof, and an image-side surface532being concave in the paraxial region thereof. Both the object-side surface531and the image-side surface532are aspheric. The third optical element530is made of plastic material.

The fourth optical element540with negative refractive power has an object-side surface541being concave in the paraxial region thereof, and an image-side surface542being convex in the paraxial region thereof. Both the object-side surface541and the image-side surface542are aspheric. The fourth optical element540is made of plastic material.

The fifth optical element550with positive refractive power has an object-side surface551being convex in the paraxial region thereof, and an image-side surface552being concave in the paraxial region thereof. Both the object-side surface551and the image-side surface552are aspheric. The fifth optical element550is made of plastic material.

The prism560is disposed between the fifth optical element550and the filter570. The prism560is made of glass material. The filter570is disposed between the prism560and the image surface580. The filter570is made of glass material and does not affect the focal length of the imaging optical lens assembly. The image sensor585is disposed on the image surface580of the imaging optical lens assembly.

FIG.5Bis a schematic view of an imaging apparatus with reflective surfaces in a first zoom state equivalent to the 5th embodiment of the present disclosure. InFIG.5B, a first optical element510′ is a prism including a reflective surface513′ so as to fold the optical path by 90 degrees. An object-side surface511′ of the first optical element510′ corresponds to the object-side surface511of the first optical element510and an image-side surface512′ of the first optical element510′ corresponds to the image-side surface512of the first optical element510such that the overall optical properties of the first optical element510′ are equivalent to those of the first optical element510shown inFIG.5A. A prism560′ includes a reflective surface563′ such that the overall optical properties of the prism560′ are equivalent to those of the prism560shown inFIG.5A. According to the aforementioned configuration, an imaging apparatus equivalent to the 5th embodiment with the optical path being folded can be obtained.

FIG.5Dis a schematic view of an imaging apparatus in a second zoom state according to the 5th embodiment of the present disclosure.FIG.5Eis a schematic view of an imaging apparatus with reflective surfaces in a second zoom state equivalent to the 5th embodiment of the present disclosure.FIG.5Fshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus in a second zoom state according to the 5th embodiment. The imaging apparatus according to the 5th embodiment changes from the first zoom state into the second zoom state by changing the distance between the image-side surface512of the first optical element510and the stop500from 1.008 mm to 0.799 mm, and changing the distance between the filter570and the image surface580from 0.352 mm to 0.538 mm. The configuration of the rest optical elements of the 5th embodiment in the second zoom state is the same as that in the first zoom state.FIG.5Eis a schematic view of an imaging apparatus with reflective surfaces in a second zoom state equivalent to the 5th embodiment of the present disclosure. All the descriptions thereto are the same as the aforementioned zoom state and explanations in this regard will not be provided again.

In the 5th embodiment, the equation of the aspheric surface profiles of the aforementioned optical elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in table below 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 9 and TABLE 10 and satisfy the conditions stated in table below.

FIG.6Ais a schematic view of an imaging apparatus in a first zoom state according to the 6th embodiment of the present disclosure.FIG.6Bis a schematic view of an imaging apparatus with reflective surfaces in a first zoom state equivalent to the 6th embodiment of the present disclosure.FIG.6Cshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus in a first zoom state according to the 6th embodiment.

InFIG.6A, the imaging apparatus includes an imaging optical lens assembly (not otherwise herein labeled) of the present disclosure and an image sensor685. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first optical element610, an aperture stop600, a second optical element620, a third optical element630, a fourth optical element640, a fifth optical element650, a prism660, a filter670, and an image surface680. There is no additional optical element inserted between the first optical element610and the fifth optical element650. There are air gaps between paraxial regions of the first optical element610, the second optical element620, the third optical element630, the fourth optical element640, and the fifth optical element650.

The first optical element610with positive refractive power has an object-side surface611being concave in the paraxial region thereof, and an image-side surface612being convex in the paraxial region thereof. Both the object-side surface611and the image-side surface612are spherical. The first optical element610is made of plastic material.

The second optical element620with positive refractive power has an object-side surface621being convex in the paraxial region thereof, and an image-side surface622being convex in the paraxial region thereof. Both the object-side surface621and the image-side surface622are aspheric. The second optical element620is made of plastic material.

The third optical element630with negative refractive power has an object-side surface631being convex in the paraxial region thereof, and an image-side surface632being concave in the paraxial region thereof. Both the object-side surface631and the image-side surface632are aspheric. The third optical element630is made of plastic material.

The fourth optical element640with positive refractive power has an object-side surface641being concave in the paraxial region thereof, and an image-side surface642being convex in the paraxial region thereof. Both the object-side surface641and the image-side surface642are aspheric. The fourth optical element640is made of plastic material.

The fifth optical element650with positive refractive power has an object-side surface651being convex in the paraxial region thereof, and an image-side surface652being concave in the paraxial region thereof. Both the object-side surface651and the image-side surface652are aspheric. The fifth optical element650is made of plastic material.

The prism660is disposed between the fifth optical element650and the filter670. The prism660is made of glass material. The filter670is disposed between the prism660and the image surface680. The filter670is made of glass material and does not affect the focal length of the imaging optical lens assembly. The image sensor685is disposed on the image surface680of the imaging optical lens assembly.

FIG.6Bis a schematic view of an imaging apparatus with reflective surfaces in a first zoom state equivalent to the 6th embodiment of the present disclosure. InFIG.6B, a first optical element610′ is a prism including a reflective surface613′ so as to fold the optical path by 90 degrees. An object-side surface611′ of the first optical element610′ corresponds to the object-side surface611of the first optical element610and an image-side surface612′ of the first optical element610′ corresponds to the image-side surface612of the first optical element610such that the overall optical properties of the first optical element610′ are equivalent to those of the first optical element610shown inFIG.6A. A prism660′ includes a reflective surface663′ such that the overall optical properties of the prism660′ are equivalent to those of the prism660shown inFIG.6A. According to the aforementioned configuration, an imaging apparatus equivalent to the 6th embodiment with the optical path being folded can be obtained.

FIG.6Dis a schematic view of an imaging apparatus in a second zoom state according to the 6th embodiment of the present disclosure.FIG.6Eis a schematic view of an imaging apparatus with reflective surfaces in a second zoom state equivalent to the 6th embodiment of the present disclosure.FIG.6Fshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus in a second zoom state according to the 6th embodiment. The imaging apparatus according to the 6th embodiment changes from the first zoom state into the second zoom state by changing the distance between the image-side surface612of the first optical element610and the stop600from 0.927 mm to 0.725 mm, and changing the distance between the filter670and the image surface680from 0.563 mm to 0.765 mm. As such, an axial distance between the image-side surface612of the first optical element610and the image surface680along the optical path remains the same while performing focusing. The configuration of the rest optical elements of the 6th embodiment in the second zoom state is the same as that in the first zoom state.FIG.6Eis a schematic view of an imaging apparatus with reflective surfaces in a second zoom state equivalent to the 6th embodiment of the present disclosure. All the descriptions thereto are the same as the aforementioned zoom state and explanations in this regard will not be provided again.

In the 6th embodiment, the equation of the aspheric surface profiles of the aforementioned optical elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in table below 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 11 and TABLE 12 and satisfy the conditions stated in table below.

FIG.7Ais a schematic view of an imaging apparatus in a first zoom state according to the 7th embodiment of the present disclosure.FIG.7Bis a schematic view of an imaging apparatus with reflective surfaces in a first zoom state equivalent to the 7th embodiment of the present disclosure.FIG.7Cshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus in a first zoom state according to the 7th embodiment.

InFIG.7A, the imaging apparatus includes an imaging optical lens assembly (not otherwise herein labeled) of the present disclosure and an image sensor785. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first optical element710, an aperture stop700, a second optical element720, a third optical element730, a fourth optical element740, a fifth optical element750, a prism760, a filter770, and an image surface780. There is no additional optical element inserted between the first optical element710and the fifth optical element750. There are air gaps between paraxial regions of the first optical element710, the second optical element720, the third optical element730, the fourth optical element740, and the fifth optical element750.

The first optical element710with positive refractive power has an object-side surface711being concave in the paraxial region thereof, and an image-side surface712being convex in the paraxial region thereof. Both the object-side surface711and the image-side surface712are aspheric. The first optical element710is made of plastic material.

The second optical element720with positive refractive power has an object-side surface721being convex in the paraxial region thereof, and an image-side surface722being convex in the paraxial region thereof. Both the object-side surface721and the image-side surface722are aspheric. The second optical element720is made of plastic material.

The third optical element730with negative refractive power has an object-side surface731being convex in the paraxial region thereof, and an image-side surface732being concave in the paraxial region thereof. Both the object-side surface731and the image-side surface732are aspheric. The third optical element730is made of plastic material.

The fourth optical element740with negative refractive power has an object-side surface741being concave in the paraxial region thereof, and an image-side surface742being convex in the paraxial region thereof. Both the object-side surface741and the image-side surface742are aspheric. The fourth optical element740is made of plastic material.

The fifth optical element750with positive refractive power has an object-side surface751being convex in the paraxial region thereof, and an image-side surface752being concave in the paraxial region thereof. Both the object-side surface751and the image-side surface752are aspheric. The fifth optical element750is made of plastic material.

The prism760is disposed between the fifth optical element750and the filter770. The prism760is made of glass material. The filter770is disposed between the prism760and the image surface780. The filter770is made of glass material and does not affect the focal length of the imaging optical lens assembly. The image sensor785is disposed on the image surface780of the imaging optical lens assembly.

FIG.7Bis a schematic view of an imaging apparatus with reflective surfaces in a first zoom state equivalent to the 7th embodiment of the present disclosure. InFIG.7B, a first optical element710′ is a prism including a reflective surface713′ so as to fold the optical path by 90 degrees. An object-side surface711′ of the first optical element710′ corresponds to the object-side surface711of the first optical element710and an image-side surface712′ of the first optical element710′ corresponds to the image-side surface712of the first optical element710such that the overall optical properties of the first optical element710′ are equivalent to those of the first optical element710shown inFIG.7A. A prism760′ includes a reflective surface763′ such that the overall optical properties of the prism760′ are equivalent to those of the prism760shown inFIG.7A. According to the aforementioned configuration, an imaging apparatus equivalent to the 7th embodiment with the optical path being folded can be obtained.

FIG.7Dis a schematic view of an imaging apparatus in a second zoom state according to the 7th embodiment of the present disclosure.FIG.7Eis a schematic view of an imaging apparatus with reflective surfaces in a second zoom state equivalent to the 7th embodiment of the present disclosure.FIG.7Fshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus in a second zoom state according to the 7th embodiment. The imaging apparatus according to the 7th embodiment changes from the first zoom state into the second zoom state by changing the distance between the image-side surface712of the first optical element710and the stop700from 0.872 mm to 0.722 mm, and changing the distance between the filter770and the image surface780from 0.362 mm to 0.539 mm. The configuration of the rest optical elements of the 7th embodiment in the second zoom state is the same as that in the first zoom state.FIG.7Eis a schematic view of an imaging apparatus with reflective surfaces in a second zoom state equivalent to the 7th embodiment of the present disclosure. All the descriptions thereto are the same as the aforementioned zoom state and explanations in this regard will not be provided again.

In the 7th embodiment, the equation of the aspheric surface profiles of the aforementioned optical elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in table below 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 13 and TABLE 14 and satisfy the conditions stated in table below.

FIG.8Ais a schematic view of an imaging apparatus in a first zoom state according to the 8th embodiment of the present disclosure.FIG.8Bis a schematic view of an imaging apparatus with reflective surfaces in a first zoom state equivalent to the 8th embodiment of the present disclosure.FIG.8Cshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus in a first zoom state according to the 8th embodiment.

InFIG.8A, the imaging apparatus includes an imaging optical lens assembly (not otherwise herein labeled) of the present disclosure and an image sensor885. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first optical element810, an aperture stop800, a second optical element820, a third optical element830, a fourth optical element840, a fifth optical element850, a prism860, a filter870, and an image surface880. There is no additional optical element inserted between the first optical element810and the fifth optical element850. There are air gaps between paraxial regions of the first optical element810, the second optical element820, the third optical element830, the fourth optical element840, and the fifth optical element850.

The first optical element810with positive refractive power has an object-side surface811being concave in the paraxial region thereof, and an image-side surface812being convex in the paraxial region thereof. Both the object-side surface811and the image-side surface812are aspheric. The first optical element810is made of plastic material.

The second optical element820with positive refractive power has an object-side surface821being convex in the paraxial region thereof, and an image-side surface822being convex in the paraxial region thereof. Both the object-side surface821and the image-side surface822are aspheric. The second optical element820is made of plastic material.

The third optical element830with negative refractive power has an object-side surface831being convex in the paraxial region thereof, and an image-side surface832being concave in the paraxial region thereof. Both the object-side surface831and the image-side surface832are aspheric. The third optical element830is made of plastic material.

The fourth optical element840with negative refractive power has an object-side surface841being concave in the paraxial region thereof, and an image-side surface842being convex in the paraxial region thereof. Both the object-side surface841and the image-side surface842are aspheric. The fourth optical element840is made of plastic material.

The fifth optical element850with positive refractive power has an object-side surface851being convex in the paraxial region thereof, and an image-side surface852being concave in the paraxial region thereof. Both the object-side surface851and the image-side surface852are aspheric. The fifth optical element850is made of plastic material.

The prism860is disposed between the fifth optical element850and the filter870. The prism860is made of glass material. The filter870is disposed between the prism860and the image surface880. The filter870is made of glass material and does not affect the focal length of the imaging optical lens assembly. The image sensor885is disposed on the image surface880of the imaging optical lens assembly.

FIG.8Bis a schematic view of an imaging apparatus with reflective surfaces in a first zoom state equivalent to the 8th embodiment of the present disclosure. InFIG.8B, a first optical element810′ is a prism including a reflective surface813′ so as to fold the optical path by 90 degrees. An object-side surface811′ of the first optical element810′ corresponds to the object-side surface811of the first optical element810and an image-side surface812′ of the first optical element810′ corresponds to the image-side surface812of the first optical element810such that the overall optical properties of the first optical element810′ are equivalent to those of the first optical element810shown inFIG.8A. A prism860′ includes a reflective surface863′ such that the overall optical properties of the prism860′ are equivalent to those of the prism860shown inFIG.8A. According to the aforementioned configuration, an imaging apparatus equivalent to the 8th embodiment with the optical path being folded can be obtained.

FIG.8Dis a schematic view of an imaging apparatus in a second zoom state according to the 8th embodiment of the present disclosure.FIG.8Eis a schematic view of an imaging apparatus with reflective surfaces in a second zoom state equivalent to the 8th embodiment of the present disclosure.FIG.8Fshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus in a second zoom state according to the 8th embodiment. The imaging apparatus according to the 8th embodiment changes from the first zoom state into the second zoom state by changing the distance between the image-side surface812of the first optical element810and the stop800from 0.944 mm to 0.742 mm, and changing the distance between the filter870and the image surface880from 0.302 mm to 0.542 mm. The configuration of the rest optical elements of the 8th embodiment in the second zoom state is the same as that in the first zoom state.FIG.8Eis a schematic view of an imaging apparatus with reflective surfaces in a second zoom state equivalent to the 8th embodiment of the present disclosure. All the descriptions thereto are the same as the aforementioned zoom state and explanations in this regard will not be provided again.

In the 8th embodiment, the equation of the aspheric surface profiles of the aforementioned optical elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in table below 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 15 and TABLE 16 and satisfy the conditions stated in table below.

FIG.9Ais a schematic view of an imaging apparatus in a first zoom state according to the 9th embodiment of the present disclosure.FIG.9Bis a schematic view of an imaging apparatus with reflective surfaces in a first zoom state equivalent to the 9th embodiment of the present disclosure.FIG.9Cshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus in a first zoom state according to the 9th embodiment.

InFIG.9A, the imaging apparatus includes an imaging optical lens assembly (not otherwise herein labeled) of the present disclosure and an image sensor985. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first optical element910, an aperture stop900, a second optical element920, a third optical element930, a fourth optical element940, a fifth optical element950, a prism960, a filter970, and an image surface980. There is no additional optical element inserted between the first optical element910and the fifth optical element950. There are air gaps between paraxial regions of the first optical element910, the second optical element920, the third optical element930, the fourth optical element940, and the fifth optical element950.

The first optical element910with positive refractive power has an object-side surface911being concave in the paraxial region thereof, and an image-side surface912being convex in the paraxial region thereof. Both the object-side surface911and the image-side surface912are aspheric. The first optical element910is made of plastic material. In one embodiment of the present disclosure, the first optical element910is made of cyclo olefin polymer material and the cyclo olefin polymer may be a copolymer.

The second optical element920with positive refractive power has an object-side surface921being convex in the paraxial region thereof, and an image-side surface922being convex in the paraxial region thereof. Both the object-side surface921and the image-side surface922are aspheric. The second optical element920is made of plastic material.

The third optical element930with negative refractive power has an object-side surface931being planar in the paraxial region thereof, and an image-side surface932being concave in the paraxial region thereof. Both the object-side surface931and the image-side surface932are aspheric. The third optical element930is made of plastic material.

The fourth optical element940with negative refractive power has an object-side surface941being concave in the paraxial region thereof, and an image-side surface942being concave in the paraxial region thereof. Both the object-side surface941and the image-side surface942are aspheric. The fourth optical element940is made of plastic material.

The fifth optical element950with positive refractive power has an object-side surface951being convex in the paraxial region thereof, and an image-side surface952being concave in the paraxial region thereof. Both the object-side surface951and the image-side surface952are aspheric. The fifth optical element950is made of plastic material.

The prism960is disposed between the fifth optical element950and the filter970. The prism960is made of glass material. The filter970is disposed between the prism960and the image surface980. The filter970is made of glass material and does not affect the focal length of the imaging optical lens assembly. The image sensor985is disposed on the image surface980of the imaging optical lens assembly.

FIG.9Bis a schematic view of an imaging apparatus with reflective surfaces in a first zoom state equivalent to the 9th embodiment of the present disclosure. InFIG.9B, a first optical element910′ is a prism including a reflective surface913′ so as to fold the optical path by 90 degrees. An object-side surface911′ of the first optical element910′ corresponds to the object-side surface911of the first optical element910and an image-side surface912′ of the first optical element910′ corresponds to the image-side surface912of the first optical element910such that the overall optical properties of the first optical element910′ are equivalent to those of the first optical element910shown inFIG.9A. A prism960′ includes a reflective surface963′ such that the overall optical properties of the prism960′ are equivalent to those of the prism960shown inFIG.9A. According to the aforementioned configuration, an imaging apparatus equivalent to the 9th embodiment with the optical path being folded can be obtained.

FIG.9Dis a schematic view of an imaging apparatus in a second zoom state according to the 9th embodiment of the present disclosure.FIG.9Eis a schematic view of an imaging apparatus with reflective surfaces in a second zoom state equivalent to the 9th embodiment of the present disclosure.FIG.9Fshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus in a second zoom state according to the 9th embodiment. The imaging apparatus according to the 9th embodiment changes from the first zoom state into the second zoom state by changing the distance between the image-side surface912of the first optical element910and the stop900from 0.401 mm to 0.020 mm, and changing the distance between the filter970and the image surface980from 1.726 mm to 2.107 mm. As such, an axial distance between the image-side surface912of the first optical element910and the image surface980along the optical path remains the same while performing focusing. The configuration of the rest optical elements of the 9th embodiment in the second zoom state is the same as that in the first zoom state.FIG.9Eis a schematic view of an imaging apparatus with reflective surfaces in a second zoom state equivalent to the 9th embodiment of the present disclosure. All the descriptions thereto are the same as the aforementioned zoom state and explanations in this regard will not be provided again.

The detailed optical data of the 9th embodiment are shown in TABLE 17, and the aspheric surface data are shown in TABLE 18.

In the 9th embodiment, the equation of the aspheric surface profiles of the aforementioned optical elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in table below 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 17 and TABLE 18 and satisfy the conditions stated in table below.

FIG.10Ais a schematic view of an imaging apparatus in a first zoom state according to the 10th embodiment of the present disclosure.FIG.10Bis a schematic view of an imaging apparatus with reflective surfaces in a first zoom state equivalent to the 10th embodiment of the present disclosure.FIG.10Cshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus in a first zoom state according to the 10th embodiment.

InFIG.10A, the imaging apparatus includes an imaging optical lens assembly (not otherwise herein labeled) of the present disclosure and an image sensor1085. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first optical element1010, an aperture stop1000, a second optical element1020, a third optical element1030, a fourth optical element1040, a fifth optical element1050, a prism1060, a filter1070, and an image surface1080. There is no additional optical element inserted between the first optical element1010and the fifth optical element1050. There are air gaps between paraxial regions of the first optical element1010, the second optical element1020, the third optical element1030, the fourth optical element1040, and the fifth optical element1050.

The first optical element1010with positive refractive power has an object-side surface1011being concave in the paraxial region thereof, and an image-side surface1012being convex in the paraxial region thereof. Both the object-side surface1011and the image-side surface1012are spherical. The first optical element1010is made of glass material.

The second optical element1020with positive refractive power has an object-side surface1021being convex in the paraxial region thereof, and an image-side surface1022being convex in the paraxial region thereof. Both the object-side surface1021and the image-side surface1022are aspheric. The second optical element1020is made of plastic material.

The third optical element1030with negative refractive power has an object-side surface1031being concave in the paraxial region thereof, and an image-side surface1032being concave in the paraxial region thereof. Both the object-side surface1031and the image-side surface1032are aspheric. The third optical element1030is made of plastic material.

The fourth optical element1040with positive refractive power has an object-side surface1041being concave in the paraxial region thereof, and an image-side surface1042being convex in the paraxial region thereof. Both the object-side surface1041and the image-side surface1042are aspheric. The fourth optical element1040is made of plastic material.

The fifth optical element1050with negative refractive power has an object-side surface1051being convex in the paraxial region thereof, and an image-side surface1052being concave in the paraxial region thereof. Both the object-side surface1051and the image-side surface1052are aspheric. The fifth optical element1050is made of plastic material.

The prism1060is disposed between the fifth optical element1050and the filter1070. The prism1060is made of glass material. The filter1070is disposed between the prism1060and the image surface1080. The filter1070is made of glass material and does not affect the focal length of the imaging optical lens assembly. The image sensor1085is disposed on the image surface1080of the imaging optical lens assembly.

FIG.10Bis a schematic view of an imaging apparatus with reflective surfaces in a first zoom state equivalent to the 10th embodiment of the present disclosure. InFIG.10B, a first optical element1010′ is a prism including a reflective surface1013′ so as to fold the optical path by 90 degrees. An object-side surface1011′ of the first optical element1010′ corresponds to the object-side surface1011of the first optical element1010and an image-side surface1012′ of the first optical element1010′ corresponds to the image-side surface1012of the first optical element1010such that the overall optical properties of the first optical element1010′ are equivalent to those of the first optical element1010shown inFIG.10A. A prism1060′ includes a reflective surface1063′ such that the overall optical properties of the prism1060′ are equivalent to those of the prism1060shown inFIG.10A. According to the aforementioned configuration, an imaging apparatus equivalent to the 10th embodiment with the optical path being folded can be obtained.

FIG.10Dis a schematic view of an imaging apparatus in a second zoom state according to the 10th embodiment of the present disclosure.FIG.10Eis a schematic view of an imaging apparatus with reflective surfaces in a second zoom state equivalent to the 10th embodiment of the present disclosure.FIG.10Fshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus in a second zoom state according to the 10th embodiment. The imaging apparatus according to the 10th embodiment changes from the first zoom state into the second zoom state by changing the distance between the image-side surface1012of the first optical element1010and the stop1000from 0.703 mm to 0.516 mm, and changing the distance between the filter1070and the image surface1080from 0.454 mm to 0.641 mm. As such, an axial distance between the image-side surface1012of the first optical element1010and the image surface1080along the optical path remains the same while performing focusing. The configuration of the rest optical elements of the 10th embodiment in the second zoom state is the same as that in the first zoom state.FIG.10Eis a schematic view of an imaging apparatus with reflective surfaces in a second zoom state equivalent to the 10th embodiment of the present disclosure. All the descriptions thereto are the same as the aforementioned zoom state and explanations in this regard will not be provided again.

The detailed optical data of the 10th embodiment are shown in TABLE 19, and the aspheric surface data are shown in TABLE 20.

In the 10th embodiment, the equation of the aspheric surface profiles of the aforementioned optical elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in table below 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 and satisfy the conditions stated in table below.

FIG.11Ais a schematic view of an imaging apparatus according to the 11th embodiment of the present disclosure.FIG.11Bis a schematic view of an imaging apparatus with reflective surfaces equivalent to the 11th embodiment of the present disclosure.FIG.11Cshows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 11th embodiment.

InFIG.11A, the imaging apparatus includes an imaging optical lens assembly (not otherwise herein labeled) of the present disclosure and an image sensor1185. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first optical element1110, an aperture stop1100, a second optical element1120, a third optical element1130, a fourth optical element1140, a fifth optical element1150, a filter1170, and an image surface1180. There is no additional optical element inserted between the first optical element1110and the fifth optical element1150. There are air gaps between paraxial regions of the first optical element1110, the second optical element1120, the third optical element1130, the fourth optical element1140, and the fifth optical element1150.

The first optical element1110with positive refractive power has an object-side surface1111being concave in the paraxial region thereof, and an image-side surface1112being convex in the paraxial region thereof. Both the object-side surface1111and the image-side surface1112are spherical. The first optical element1110is made of glass material.

The second optical element1120with positive refractive power has an object-side surface1121being convex in the paraxial region thereof, and an image-side surface1122being convex in the paraxial region thereof. Both the object-side surface1121and the image-side surface1122are aspheric. The second optical element1120is made of plastic material.

The third optical element1130with negative refractive power has an object-side surface1131being concave in the paraxial region thereof, and an image-side surface1132being concave in the paraxial region thereof. Both the object-side surface1131and the image-side surface1132are aspheric. The third optical element1130is made of plastic material.

The fourth optical element1140with positive refractive power has an object-side surface1141being convex in the paraxial region thereof, and an image-side surface1142being convex in the paraxial region thereof. Both the object-side surface1141and the image-side surface1142are aspheric. The fourth optical element1140is made of plastic material.

The fifth optical element1150with positive refractive power has an object-side surface1151being convex in the paraxial region thereof, and an image-side surface1152being concave in the paraxial region thereof. Both the object-side surface1151and the image-side surface1152are aspheric. The fifth optical element1150is made of plastic material.

The filter1170is disposed between the fifth optical element1150and the image surface1180. The filter1170is made of glass material and will not affect the focal length of the imaging optical lens assembly. The image sensor1185is disposed on the image surface1180of the imaging optical lens assembly.

FIG.11Bis a schematic view of an imaging apparatus with reflective surfaces equivalent to the 11th embodiment of the present disclosure. InFIG.11B, a first optical element1110′ is a prism including a reflective surface1113′ so as to fold the optical path by 90 degrees. An object-side surface1111′ of the first optical element1110′ corresponds to the object-side surface1111of the first optical element1110and an image-side surface1112′ of the first optical element1110′ corresponds to the image-side surface1112of the first optical element1110such that the overall optical properties of the first optical element1110′ are equivalent to those of the first optical element1110shown inFIG.11A. According to the aforementioned configuration, an imaging apparatus equivalent to the 11th embodiment with the optical path being folded can be obtained.

The detailed optical data of the 11th embodiment are shown in TABLE 21, and the aspheric surface data are shown in TABLE 22.

In the 11th embodiment, the equation of the aspheric surface profiles of the aforementioned optical elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in table below 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 21 and TABLE 22 and satisfy the conditions stated in table below.

FIG.16is a 3-dimensional schematic view of an imaging apparatus10aaccording to the 12th embodiment of the present disclosure. In the present embodiment, the imaging apparatus10ais a camera module. The imaging apparatus10aincludes an imaging optical lens assembly11a, a driving device12a, and an image sensor13a. The imaging optical lens assembly11aincludes the imaging optical lens assembly of the 1st embodiment described above and a lens barrel (not otherwise herein labeled) for carrying the imaging optical lens assembly. The imaging apparatus10auses the imaging optical lens assembly11ato converge light and generates an image by, utilizes the driving device12afor focusing so as to photograph on the image sensor13a(that is the image sensor185in the 1st embodiment), and outputs the image data thereafter.

The driving device12amay be an auto-focus module that can be driven by a voice coil motor (VCM), a micro electro-mechanical system (MEMS), a piezoelectric system, shape memory alloys or other driving systems. The driving device12aallows the imaging optical lens assembly11ato obtain a better imaging position, so that a clear image can be obtained wherever an imaged object is positioned with different object distances.

The imaging apparatus10amay be equipped with an image sensor13a(e.g., CMOS, CCD) with high sensitivity and low noise on the image surface to provide accurate and satisfactory image quality from the imaging optical lens assembly.

In addition, the imaging apparatus10amay further include an image stabilizer14a, which may be a motion sensing element such as an accelerometer, a gyro sensor or a Hall Effect sensor. The image stabilizer14ain the 12th embodiment is a gyro sensor but is not limited thereto. By adjusting the photographing lens system in different axial directions to provide compensation for image blurs due to motion during exposures, the image quality under dynamic and low-light circumstances can be further improved, and enhanced image compensation functions such as optical image stabilization (OIS) or electronic image stabilization (EIS) can also be provided.

The imaging apparatus10aof the present disclosure is not limited to be applied to the smartphone. The imaging apparatus10amay be used in a system of moving focus and features excellent aberration corrections with satisfactory image quality. For example, the imaging apparatus10amay be applied to a variety of applications such as car electronics, drones, smart electronic products, tablet computers, wearable devices, medical devices, precision instruments, surveillance cameras, portable video recorders, identification systems, multi-lens devices, somatosensory detections, virtual realities, motion devices, smart home systems and other electronic devices.

FIG.17Ais a front view of an electronic device1300according to the 13th embodiment of the present disclosure.FIG.17Bis a rear view of the electronic device1300shown in theFIG.17A. In the present embodiment, the electronic device1300is a smartphone. As shown inFIG.17A, the electronic device1300includes a display1310, a TOF (Time of Flight) module1320, an imaging apparatus1330, and an imaging apparatus1331on the front surface. The imaging apparatus1330and the imaging apparatus1331are positioned above the top of the display1310, facing toward the same direction and are horizontally disposed on an upper edge of the electronic device. The imaging apparatus1330is an ultra-wide angle imaging apparatus and the imaging apparatus1331is a wide angle imaging apparatus. The field of view of the imaging apparatus1330is larger than that of the imaging apparatus1331by at least 20 degrees.

As shown inFIG.17B, the electronic device1300includes a flash module1340, an imaging apparatus1350, an imaging apparatus1351, and an imaging apparatus1352on the back surface. The imaging apparatus1350, the imaging apparatus1351, and the imaging apparatus1352face toward the same direction and are vertically disposed on the back surface of the electronic device1300. The flash module1340is disposed on the upper edge of the back surface of the electronic device1300near the imaging apparatus1350. The imaging apparatus1350is an ultra-wide angle imaging apparatus. The imaging apparatus1351is a wide angle imaging apparatus. The imaging apparatus1352is a telephoto imaging apparatus utilizing the imaging optical lens assembly with reflective surfaces according to the 1st embodiment of the present disclosure. The field of view of the imaging apparatus1350is larger than that of the imaging apparatus1351by at least 20 degrees. The field of view of the imaging apparatus1351is larger than that of the imaging apparatus1352by at least 20 degrees. As such, the largest field of view, which is the field of view of the imaging apparatus1350, among the imaging apparatuses disposed on the back surface of the electronic device1300, is larger than the smallest field of view, which is the field of view of the imaging apparatus1352, by at least 40 degrees.

FIG.18is a rear view of the electronic device1400according to the 14th embodiment of the present disclosure. As shown inFIG.18, the electronic device1400includes a flash module1410, a TOF (Time of Flight) module1420, an imaging apparatus1430, an imaging apparatus1431, an imaging apparatus1432, an imaging apparatus1433, an imaging apparatus1434, an imaging apparatus1435, an imaging apparatus1436, and an imaging apparatus1437on the back surface. The imaging apparatus1430, the imaging apparatus1431, the imaging apparatus1432, the imaging apparatus1433, the imaging apparatus1434, the imaging apparatus1435, the imaging apparatus1436, and the imaging apparatus1437face toward the same direction and are vertically disposed in two rows on the back surface of the electronic device1400. The flash module1410and the TOF module1420are disposed on the upper edge of the back surface of the electronic device1400near the imaging apparatus1434. The imaging apparatus1430and the imaging apparatus1431are ultra-wide angle imaging apparatuses. The imaging apparatus1432and the imaging apparatus1433are wide angle imaging apparatuses. The imaging apparatus1434and the imaging apparatus1435are telephoto imaging apparatuses utilizing the imaging optical lens assembly according to the 1st embodiment of the present disclosure. The imaging apparatus1436and the imaging apparatus1437are telephoto imaging apparatuses utilizing the imaging optical lens assembly with reflective surfaces according to the 1st embodiment of the present disclosure. The fields of view of the imaging apparatus1430and the imaging apparatus1431are larger than those of the imaging apparatus1432and the imaging apparatus1433by at least 20 degrees. The fields of view of the imaging apparatus1432and the imaging apparatus1433are larger than those of the imaging apparatus1434, the imaging apparatus1435, the imaging apparatus1436, and the imaging apparatus1437by at least 20 degrees. As such, the largest fields of view, which are the fields of view of the imaging apparatus1430and the imaging apparatus1431, among the imaging apparatuses disposed on the back surface of the electronic device1400, are larger than the smallest fields of view, which are the fields of view of the imaging apparatus1434, the imaging apparatus1435, the imaging apparatus1436and the imaging apparatus1437, by at least 40 degrees.

The aforementioned exemplary figures of different electronic devices are only exemplary for showing the imaging apparatus of the present disclosure installed in an electronic device, and the present disclosure is not limited thereto. Preferably, the electronic device can further include a control unit, a display unit, a storage unit, a random access memory unit (RAM) or a combination thereof.