Patent Publication Number: US-2022229271-A1

Title: Photographing lens assembly

Description:
RELATED APPLICATIONS 
     This application is a divisional patent application of U.S. patent application Ser. No. 16/745,229, filed on Jan. 16, 2020, which is a continuation patent application of U.S. application Ser. No. 16/196,700, filed Nov. 20, 2018, which is a continuation patent application of U.S. application Ser. No. 15/459,576, filed Mar. 15, 2017, which claims priority to Taiwan Application 105138726, filed Nov. 24, 2016, which is incorporated by reference herein in its entirety. 
    
    
     BACKGROUND 
     Technical Field 
     The present disclosure relates to a photographing lens assembly, an image capturing unit and an electronic device, more particularly to a photographing lens assembly and an image capturing unit applicable to an electronic device. 
     Description of Related Art 
     In recent years, with the popularity of electronic devices having camera functionalities, the demand of miniaturized optical systems has been increasing. As the advanced semiconductor manufacturing technologies have reduced the pixel size of sensors, and compact optical systems have gradually evolved toward the field of higher megapixels, there is an increasing demand for compact optical systems featuring better image quality. 
     In order to provide better user experience, the electronic device equipped with one or more optical systems has become the mainstream product in the market. For various applications, the optical systems are developed with various optical characteristics, and have been widely applied to different kinds of smart electronic devices, such as vehicle devices, image recognition systems, entertainment devices, sport devices and intelligent home assistance systems, for various requirements. 
     However, a lens element in a conventional optical system usually has spherical lens surfaces, such that the size of the conventional optical system is difficult to be reduced. Moreover, the field of view is unfavorable for capturing a detailed image of an object located from afar. Thus, there is a need to develop an optical system featuring compact size, telephoto effect and high image quality. 
     SUMMARY 
     According to one aspect of the present disclosure, a photographing lens assembly includes five lens elements, the five lens elements being, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has an object-side surface being concave in a paraxial region thereof. The third lens element has an object-side surface being convex in a paraxial region thereof. The fourth lens element has an object-side surface being concave in a paraxial region thereof, wherein the object-side surface and an image-side surface of the fourth lens element are both aspheric. The fifth lens element has an object-side surface and an image-side surface being both aspheric. At least one surface of the lens elements of the photographing lens assembly has at least one inflection point. When a sum of axial distances between each adjacent lens element of the photographing lens assembly is ΣAT, a central thickness of the first lens element is CT1, an axial distance between the image-side surface of the fifth lens element and an image surface is BL, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, a maximum image height of the photographing lens assembly is ImgH, a focal length of the photographing lens assembly is f, the following conditions are satisfied: 
     0&lt;ΣAT/CT1&lt;1.65; 
     0.65&lt;BL/TD&lt;2.60; and 
     0.10&lt;ImgH/f&lt;0.50. 
     According to another aspect of the present disclosure, a photographing lens assembly includes five lens elements, the five lens elements being, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The third lens element has an object-side surface being convex in a paraxial region thereof. The fourth lens element has an object-side surface and an image-side surface being both aspheric. The fifth lens element has an object-side surface and an image-side surface being both aspheric. At least one surface of the lens elements of the photographing lens assembly has at least one inflection point. When a sum of axial distances between each adjacent lens element of the photographing lens assembly is ΣAT, a central thickness of the first lens element is CT1, an axial distance between the image-side surface of the fifth lens element and an image surface is BL, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, a maximum image height of the photographing lens assembly is ImgH, a focal length of the photographing lens assembly is f, a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of the object-side surface of the fourth lens element is R7, the following conditions are satisfied: 
     0&lt;ΣAT/CT1&lt;1.55; 
     0.70&lt;BL/TD&lt;2.20; 
     0.10&lt;ImgH/f&lt;0.50; and 
     −3.0&lt;R1/R7&lt;1.30. 
     According to still another aspect of the present disclosure, an image capturing unit includes the aforementioned imaging optical lens assembly, an optical image stabilizer and an image sensor, wherein the image sensor is disposed on the image surface of the photographing lens assembly. 
     According to yet still another aspect of the present disclosure, an electronic device includes the aforementioned image capturing unit. 
     According to yet still another aspect of the present disclosure, a photographing lens assembly includes five lens elements, the five lens elements being, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has an object-side surface being concave in a paraxial region thereof. The third lens element has an object-side surface being convex in a paraxial region thereof. The fourth lens element has an object-side surface being concave in a paraxial region thereof, wherein the object-side surface and an image-side surface of the fourth lens element are both aspheric. The fifth lens element has an object-side surface and an image-side surface being both aspheric. At least one surface of the lens elements of the photographing lens assembly has at least one inflection point. When a sum of axial distances between each adjacent lens element of the photographing lens assembly is ΣAT, a central thickness of the first lens element is CT1, an axial distance between the image-side surface of the fifth lens element and an image surface is BL, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, a maximum image height of the photographing lens assembly is ImgH, a focal length of the photographing lens assembly is f, a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of the object-side surface of the third lens element is R5, the following conditions are satisfied: 
     0&lt;ΣAT/CT1&lt;1.75; 
     0.65&lt;BL/TD&lt;2.60; 
     0.10&lt;ImgH/f&lt;0.50; and 
     0.55&lt;R1/R5&lt;2.0. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The disclosure can be better understood by reading the following detailed description of the embodiments, with reference made to the accompanying drawings as follows: 
         FIG. 1  is a schematic view of an image capturing unit according to the 1st embodiment of the present disclosure; 
         FIG. 1A  is a schematic view of the image capturing unit with another configuration of prism according to the 1st embodiment of the present disclosure; 
         FIG. 1B  is a schematic view of the image capturing unit with still another configuration of prism according to the 1st embodiment of the present disclosure; 
         FIG. 2  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 1st embodiment; 
         FIG. 3  is a schematic view of an image capturing unit according to the 2nd embodiment of the present disclosure; 
         FIG. 3A  is a schematic view of the image capturing unit with another configuration of prism according to the 2nd embodiment of the present disclosure; 
         FIG. 3B  is a schematic view of the image capturing unit with still another configuration of prism according to the 2nd embodiment of the present disclosure; 
         FIG. 4  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 2nd embodiment; 
         FIG. 5  is a schematic view of an image capturing unit according to the 3rd embodiment of the present disclosure; 
         FIG. 6  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 3rd embodiment; 
         FIG. 7  is a schematic view of an image capturing unit according to the 4th embodiment of the present disclosure; 
         FIG. 8  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 4th embodiment; 
         FIG. 9  is a schematic view of an image capturing unit according to the 5th embodiment of the present disclosure; 
         FIG. 9A  is a schematic view of the image capturing unit with another configuration of prism according to the 5th embodiment of the present disclosure; 
         FIG. 10  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 5th embodiment; 
         FIG. 11  is a schematic view of an image capturing unit according to the 6th embodiment of the present disclosure; 
         FIG. 11A  is a schematic view of the image capturing unit with another configuration of prism according to the 6th embodiment of the present disclosure; 
         FIG. 11B  is a schematic view of the image capturing unit with still another configuration of prism according to the 6th embodiment of the present disclosure; 
         FIG. 12  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 6th embodiment; 
         FIG. 13  a schematic view of an image capturing unit according to the 7th embodiment of the present disclosure; 
         FIG. 13A  is a schematic view of the image capturing unit with another configuration of prism according to the 7th embodiment of the present disclosure; 
         FIG. 14  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 7th embodiment; 
         FIG. 15  a schematic view of an image capturing unit according to the 8th embodiment of the present disclosure; 
         FIG. 16  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 8th embodiment; 
         FIG. 17  a schematic view of an image capturing unit according to the 9th embodiment of the present disclosure; 
         FIG. 18  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 9th embodiment; 
         FIG. 19  a schematic view of an image capturing unit according to the 10th embodiment of the present disclosure; 
         FIG. 20  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 10th embodiment; 
         FIG. 21  is a schematic view of Yc42 according to the 3rd embodiment of the present disclosure; 
         FIG. 22  is a perspective view of an image capturing unit according to the 11th embodiment of the present disclosure; 
         FIG. 23  is a schematic view of an electronic device according to the 12th embodiment of the present disclosure; 
         FIG. 24  is a perspective view of the electronic device in  FIG. 23 ; and 
         FIG. 25  is another perspective view of the electronic device in  FIG. 23 . 
     
    
    
     DETAILED DESCRIPTION 
     A photographing lens assembly includes five lens elements. The five lens elements are, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. 
     The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. Therefore, it is favorable for providing sufficient light converging capability so as to obtain a telephoto effect; 
     furthermore, it is favorable for reducing a total track length of the photographing lens assembly so as to obtain better lens assembling. 
     The second lens element can have negative refractive power; therefore, it is favorable for correcting aberrations generated by the first lens element while correcting axial chromatic aberration, thereby converging light rays with different wavelengths on the same image surface. The second lens element can have an object-side surface being concave in a paraxial region thereof; therefore, it is favorable for obtaining a proper incident angle of the light at the surfaces of the second lens element so as to prevent excessive aberrations. 
     The third lens element can have positive refractive power; therefore, it is favorable for properly distributing the light converging capability between the first and the third lens elements while moving the principal point of the photographing lens assembly toward the image side to provide sufficient back focal length for a more flexible lens design. The third lens element has an object-side surface being convex in a paraxial region thereof; therefore, it is favorable for a better control in the traveling direction of light ray to reduce the size of the third lens element, thereby reducing the width of the photographing lens assembly. The third lens element can have an image-side surface being concave in a paraxial region thereof; therefore, it is favorable for controlling the traveling direction of light ray so as to prevent the diameter of the fourth lens element from becoming overly large. 
     The fourth lens element can have an object-side surface being concave in a paraxial region thereof; therefore, it is favorable for properly arranging the lens surface curvatures for the photographing lens assembly to maintain in a compact size with a tighter assembly of lens elements. An image-side surface of the fourth lens element can have at least one concave shape in an off-axial region thereof; therefore, it is favorable for reducing the effective radius of the surfaces of the fourth lens element so as to keep the photographing lens assembly compact. 
     The fifth lens element can have negative refractive power; therefore, it is favorable for correcting the Petzval surface so as to improve peripheral image quality. An object-side surface of the fifth lens element can have at least one concave shape in an off-axial region thereof; therefore, it is favorable for receiving light at the off-axial region to reduce the incident angle, thereby preventing total reflection at the object-side surface of the fifth lens element so as to eliminate stray light. The fifth lens element can have an image-side surface being concave in a paraxial region thereof, and the image-side surface of the fifth lens element can have at least one convex shape in an off-axial region thereof; therefore, it is favorable for improving the aberration correction at the off-axial region so as to maintain the photographing lens assembly in a compact size; furthermore, it is favorable for correcting the off-axial light ray to reduce field curvature and control the image height. Thus, the photographing lens assembly can be more flexible to design. 
     According to the present disclosure, at least one surface of the lens elements of the photographing lens assembly has at least one inflection point. In detail, among all object-side surfaces and all image-side surfaces of the first through the fifth lens elements, at least one of the surfaces has at least one inflection point. Therefore, it is favorable for correcting aberrations at the off-axial region so as to further improve peripheral image quality. 
     When a sum of axial distances between each adjacent lens element of the photographing lens assembly is ΣAT, a central thickness of the first lens element is CT1, the following condition is satisfied: 0&lt;ΣAT/CT1&lt;1.75. Therefore, it is favorable for efficiently utilizing the space in the photographing lens assembly so as to meet the requirement of compact size; furthermore, it is also favorable for improving the light convergence at the object side. Preferably, the following condition can also be satisfied: 0&lt;ΣAT/CT1&lt;1.65. More preferably, the following condition can also be satisfied: 0&lt;ΣAT/CT1&lt;1.55. 
     When an axial distance between the image-side surface of the fifth lens element and an image surface is BL, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, the following condition is satisfied: 0.65&lt;BL/TD&lt;2.60. Therefore, it is favorable to obtain a proper total track length of the photographing lens assembly for better assembling and a sufficient back focal length for accommodating additional optical components. Preferably, the following condition can also be satisfied: 0.70&lt;BL/TD&lt;2.20. 
     When a maximum image height of the photographing lens assembly (half of a diagonal length of an effective photosensitive area of an image sensor) is ImgH, a focal length of the photographing lens assembly is f, the following condition is satisfied: 0.10&lt;ImgH/f&lt;0.50. Therefore, it is favorable for obtaining a proper field of view featuring telephoto effect, thus the photographing lens assembly is applicable to more kinds of applications. Preferably, the following condition can also be satisfied: 0.20&lt;ImgH/f&lt;0.35. 
     When a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of the object-side surface of the fourth lens element is R7, the following condition can be satisfied: −3.0&lt;R1/R7&lt;1.30. Therefore, it is favorable for a balance between the surface curvature of the first lens element and that of the fourth lens element so as to further improve the telephoto effect of the photographing lens assembly. Preferably, the following condition can also be satisfied: −1.80&lt;R1/R7&lt;0.50. 
     When the curvature radius of the object-side surface of the first lens element is R1, a curvature radius of the object-side surface of the third lens element is R5, the following condition can be satisfied: 0.55&lt;R1/R5&lt;2.0. Therefore, it is favorable for converging light at the off-axial region toward an optical axis, thus the lens elements can be sturdily assembled in a compact space. 
     According to the present disclosure, the photographing lens assembly can further include an aperture atop. When an axial distance between the aperture stop and the image-side surface of the fifth lens element is SD, the axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, the following condition can be satisfied: 0.60 &lt;SD/TD&lt;0.94. Therefore, it is favorable for controlling the imaging range and the incident angle of the light projecting onto the image surface so as to provide telephoto photographic functionality with high image brightness, simultaneously. 
     When the sum of axial distances between each adjacent lens element of the photographing lens assembly is ΣAT, a sum of central thicknesses of the lens elements of the photographing lens assembly is ΣCT, the following condition can be satisfied: 0.05&lt;ΣAT/ΣCT&lt;0.50. Therefore, it is favorable for controlling the total track length of the photographing lens assembly and arranging sufficient space between each lens element so as to prevent interference during the lens assembling process. 
     When the central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, the following condition can be satisfied: 1.70&lt;CT1/CT2&lt;6.50. Therefore, it is favorable for balancing the thicknesses of the lens elements in order to efficiently utilize the space in the photographing lens assembly. 
     When an entrance pupil diameter of the photographing lens assembly is EPD, the maximum image height of the photographing lens assembly is ImgH, the following condition can be satisfied: 1.0&lt;EPD/ImgH&lt;1.80. Therefore, it is favorable for providing sufficient amount of incident light so as to increase the amount of light received per unit area of the image surface, thereby preventing vignetting. 
     When a curvature radius of the object-side surface of the second lens element is R3, a curvature radius of the image-side surface of the second lens element is R4, the following condition can be satisfied: −2.20&lt;(R3+R4)/(R3−R4)&lt;0.50. Therefore, the shape of the second lens element is favorable for a proper distribution of the marginal rays so as to reduce the effective radius of the image-side surface of the second lens element. 
     When an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the fourth lens element and the fifth lens element is T45, the following condition can be satisfied: 0&lt;T34/T45&lt;3.0. Therefore, the axial distance between the fourth lens element and the fifth lens element is sufficient for accommodating the surface shapes of the fourth lens element and the fifth lens element, thus it is favorable for utilizing space efficiently while preventing interference between lens elements. 
     According to the present disclosure, the central thickness of the first lens element can be the maximum among all central thicknesses of the five lens elements of the photographing lens assembly. In detail, the central thickness of the first lens element can be larger than the central thicknesses of the second through the fifth lens elements. Therefore, it is favorable for increasing the structural strength at the object side so that the photographing lens assembly has higher resistance against external force, thus the stable quality of sturdiness can be obtained. 
     According to the present disclosure, at least three of the five lens elements of the photographing lens assembly each can have an Abbe number smaller than 30. In detail, each of the first through the fifth lens elements has an Abbe number, and at least three of the Abbe numbers can be smaller than 30. Therefore, the refractive power of the lens elements having smaller Abbe numbers can be relatively stronger, which is favorable for improving image quality. 
     According to the present disclosure, the photographing lens assembly can further include a reflector, and the reflector is favorable for the axial direction rearrangement of the optical axis so as to obtain more flexible lens design. The reflector can be, for example, a prism, which is favorable for extending the optical axis while preventing the total track length from overly long. 
     When a focal length of the first lens element is f1, a focal length of the third lens element is f3, the following condition can be satisfied: 0&lt;f3/f1&lt;1.10. 
     Therefore, it is favorable for a proper refractive power distribution of the photographing lens assembly to obtain sufficient back focal length, and for enabling more types of applications. 
     When the focal length of the photographing lens assembly is f, a focal length of the second lens element is f2, the following condition can be satisfied: −5.50&lt;f/f2&lt;−2.50. Therefore, it is favorable for further correcting chromatic aberration of the photographing lens assembly and aberrations generated by the first lens element and the third lens element. 
     When the axial distance between the image-side surface of the fifth lens element and the image surface is BL, the maximum image height of the photographing lens assembly is ImgH, the following condition can be satisfied: 1.50&lt;BL/ImgH&lt;3.0. Therefore, it is favorable for providing sufficient back focal length and various lens design possibilities of the photographing lens assembly. 
     When a maximum effective radius of the object-side surface of the first lens element is Y11, a maximum effective radius of the image-side surface of the fifth lens element is Y52, the following condition can be satisfied: 0.95&lt;Y11/Y52&lt;1.30. Therefore, lens diameters of the photographing lens assembly are proper for maintaining a compact size thereof; furthermore, it is favorable for having a proper bearing surface area between lens elements with consistent image quality. 
     When a vertical distance between a critical point on the image-side surface of the fourth lens element and the optical axis is Yc42, a central thickness of the fourth lens element is CT4, the following condition can be satisfied: 0.01&lt;Yc42/CT4&lt;5.0. Therefore, it is favorable for correcting field curvature and off-axial aberrations. A schematic view of Yc42 according to the 3rd embodiment of the present disclosure is shown in  FIG. 21 , wherein there is a concave critical point on the image-side surface of the fourth lens element. When the image-side surface of the fourth lens element has only one critical point, the vertical distance between the optical axis and the critical point is Yc42. When the image-side surface of the fourth lens element has multiple critical points, the vertical distance between the optical axis and the critical point closest to the optical axis may be Yc42. 
     According to the present disclosure, at least three of the five lens elements of the photographing lens assembly each can have at least one inflection point. In detail, among the first through the fifth lens elements, there can be at least three lens elements which have at least one inflection point on either the object-side surface, the image-side surface or both of the two surfaces of one of the at least three lens elements. Therefore, it is favorable for correcting aberrations, such as coma and astigmatism, at the off-axial region. 
     When the focal length of the photographing lens assembly is f, the curvature radius of the object-side surface of the third lens element is R5, the following condition can be satisfied: 0&lt;R5/f&lt;0.90. Therefore, the functionality of the third lens element is enhanced to improve the symmetry of the photographing lens assembly, thus it is favorable for correcting aberrations. 
     When the focal length of the photographing lens assembly is f, the focal length of the first lens element is f1, the focal length of the second lens element is f2, the focal length of the third lens element is f3, the following condition can be satisfied: 5.0&lt;(f/f1)−(f/f2)+(f/f3)&lt;20.0. Therefore, it is favorable for balancing light convergence and correction of chromatic aberration, thereby enhancing telephoto effect. 
     When an axial distance between the object-side surface of the first lens element and the image surface is TL, the focal length of the photographing lens assembly is f, the following condition can be satisfied: 0.95&lt;TL/f&lt;1.20. Therefore, it is favorable for maintaining a short total track length while satisfying the need of capturing highly detailed images in telephoto photography. 
     When an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, an Abbe number of the fifth lens element is V5, the following condition can be satisfied: 1.0&lt;(V2+V3+V4+V5)/V1&lt;2.50. Therefore, it is favorable for improving aberration corrections while balancing chromatic aberration. 
     According to the present disclosure, the lens elements of the photographing lens assembly can be made of glass or plastic material. When the lens elements are made of glass material, the refractive power distribution of the photographing lens assembly may be more flexible to design. When the lens elements are made of plastic material, manufacturing costs can be effectively reduced. Furthermore, surfaces of each lens element can be arranged to be aspheric, since the aspheric surface of the lens element is easy to form a shape other than a spherical surface so as to have more controllable variables for eliminating aberrations thereof and to further decrease the required number of the lens elements. Therefore, the total track length of the photographing lens assembly can also be reduced. 
     According to the present disclosure, each of an object-side surface and an image-side surface of a lens element has a paraxial region and an off-axial region. The paraxial region refers to the region of the surface where light rays travel close to the optical axis, and the off-axial region refers to the region of the surface away from the paraxial region. Particularly unless otherwise stated, when the lens element has a convex surface, it indicates that the surface can be convex in the paraxial region thereof; when the lens element has a concave surface, it indicates that the surface can be concave in the paraxial region thereof. Moreover, when a region of refractive power or focus of a lens element is not defined, it indicates that the region of refractive power or focus of the lens element can be in the paraxial region thereof. 
     According to the present disclosure, an image surface of the photographing lens assembly on a corresponding image sensor can be flat or curved, particularly a concave curved surface facing towards the object side of the photographing lens assembly. 
     According to the present disclosure, the photographing lens assembly can include at least one stop, such as an aperture stop, a glare stop or a field stop. 
     Said glare stop or said field stop is allocated for eliminating the stray light and thereby improving image quality thereof. 
     According to the present disclosure, an aperture stop can be configured as a front stop or a middle stop. A front stop disposed between the imaged object and the first lens element can produce a telecentric effect by providing a longer distance between an exit pupil and the image surface, thereby improving the image-sensing efficiency of an image sensor (for example, CCD or CMOS). A middle stop disposed between the first lens element and the image surface is favorable for enlarging the view angle and thereby provides a wider field of view. According to the above description of the present disclosure, the following specific embodiments are provided for further explanation. 
     1st Embodiment 
       FIG. 1  is a schematic view of an image capturing unit according to the 1st embodiment of the present disclosure.  FIG. 1A  is a schematic view of the image capturing unit with another configuration of prism according to the 1st embodiment of the present disclosure.  FIG. 1B  is a schematic view of the image capturing unit with still another configuration of prism according to the 1st embodiment of the present disclosure.  FIG. 2  shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 1st embodiment. In  FIG. 1  to  FIG. 1B , the image capturing unit includes the photographing lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  180 . The photographing lens assembly includes, in order from an object side to an image side, an object-side prism  191 , an aperture  100 , a first lens element  110 , a second lens element  120 , a third lens element  130 , a fourth lens element  140 , a fifth lens element  150 , an image-side prism  192 , an IR-cut filter  160  and an image surface  170 . The photographing lens assembly includes five lens elements ( 110 - 150 ) with no additional lens element disposed between the first lens element  110  and the fifth lens element  150 . 
     The first lens element  110  with positive refractive power has an object-side surface  111  being convex in a paraxial region thereof and an image-side surface  112  being convex in a paraxial region thereof. The first lens element  110  is made of plastic material and has the object-side surface  111  and the image-side surface  112  being both aspheric. The image-side surface  112  of the first lens element  110  has at least one inflection point. 
     The second lens element  120  with negative refractive power has an object-side surface  121  being concave in a paraxial region thereof and an image-side surface  122  being concave in a paraxial region thereof. The second lens element  120  is made of plastic material and has the object-side surface  121  and the image-side surface  122  being both aspheric. Each of the object-side surface  121  and the image-side surface  122  of the second lens element  120  has at least one inflection point. 
     The third lens element  130  with positive refractive power has an object-side surface  131  being convex in a paraxial region thereof and an image-side surface  132  being concave in a paraxial region thereof. The third lens element  130  is made of plastic material and has the object-side surface  131  and the image-side surface  132  being both aspheric. 
     The fourth lens element  140  with negative refractive power has an object-side surface  141  being concave in a paraxial region thereof and an image-side surface  142  being convex in a paraxial region thereof. The fourth lens element  140  is made of plastic material and has the object-side surface  141  and the image-side surface  142  being both aspheric. The object-side surface  141  of the fourth lens element  140  has at least one inflection point. The image-side surface  142  of the fourth lens element  140  has at least one concave shape in an off-axial region thereof. The image-side surface  142  of the fourth lens element  140  has at least one concave critical point in an off-axial region thereof. 
     The fifth lens element  150  with negative refractive power has an object-side surface  151  being convex in a paraxial region thereof and an image-side surface  152  being concave in a paraxial region thereof. The fifth lens element  150  is made of plastic material and has the object-side surface  151  and the image-side surface  152  being both aspheric. The object-side surface  151  of the fifth lens element  150  has at least one concave shape in an off-axial region thereof. The image-side surface  152  of the fifth lens element  150  has at least one convex shape in an off-axial region thereof. 
     The IR-cut filter  160  is made of glass material and located between the fifth lens element  150  and the image surface  170 , and will not affect the focal length of the photographing lens assembly. The image sensor  180  is disposed on or near the image surface  170  of the photographing lens assembly. 
     Both the object-side prism  191  and the image-side prism  192  are made of glass material. In  FIG. 1 , a configuration of the object-side prism  191  and the image-side prism  192  in the image capturing unit is for extending the optical axis. In  FIG. 1A  and  FIG. 1B , a configuration of the object-side prism  191  and the image-side prism  192  in the image capturing unit is for changing the direction of the optical axis. 
     The equation of the aspheric surface profiles of the aforementioned lens elements of the 1st embodiment is expressed as follows: 
     
       
         
           
             
               
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                                   + 
                                   k 
                                 
                                 ) 
                               
                               × 
                               
                                 
                                   ( 
                                   
                                     Y 
                                     / 
                                     R 
                                   
                                   ) 
                                 
                                 2 
                               
                             
                           
                           ) 
                         
                       
                     
                     ) 
                   
                 
                 + 
                 
                   
                     ∑ 
                     i 
                   
                     
                   
                     
                       ( 
                       Ai 
                       ) 
                     
                     × 
                     
                       ( 
                       
                         Y 
                         i 
                       
                       ) 
                     
                   
                 
               
             
             , 
           
         
       
     
     where, 
     X is the relative distance between a point on the aspheric surface spaced at a distance Y from an optical axis and the tangential plane at the aspheric surface vertex on the optical axis; 
     Y is the vertical distance from the point on the aspheric surface to the optical axis; 
     R is the curvature radius; 
     k is the conic coefficient; and 
     Ai is the i-th aspheric coefficient, and in the embodiments, i may be, but is not limited to, 4, 6, 8, 10, 12, and 14. 
     In the photographing lens assembly of the image capturing unit according to the 1st embodiment, when a focal length of the photographing lens assembly is f, an f-number of the photographing lens assembly is Fno, and half of a maximum field of view of the photographing lens assembly is HFOV, these parameters have the following values: f=8.70 millimeters (mm); Fno=2.80; and HFOV=16.0 degrees (deg.). 
     When an Abbe number of the first lens element  110  is V1, an Abbe number of the second lens element  120  is V2, an Abbe number of the third lens element  130  is V3, an Abbe number of the fourth lens element  140  is V4, an Abbe number of the fifth lens element  150  is V5, the following condition is satisfied: (V2+V3+V4+V5)/V1=2.14. 
     When a central thickness of the first lens element  110  is CT1, a central thickness of the second lens element  120  is CT2, the following condition is satisfied: CT1/CT2=2.63. 
     When an axial distance between the third lens element  130  and the fourth lens element  140  is T34, an axial distance between the fourth lens element  140  and the fifth lens element  150  is T45, the following condition is satisfied: T34/T45=0.61. 
     When a sum of axial distances between each adjacent lens element of the photographing lens assembly is ΣAT, the central thickness of the first lens element  110  is CT1, the following condition is satisfied: ΣAT/CT1=0.65. 
     When the sum of axial distances between each adjacent lens element of the photographing lens assembly is ΣAT, a sum of central thicknesses of the lens elements of the photographing lens assembly is ΣCT, the following condition is satisfied: ΣAT/ΣCT=0.23. 
     When a curvature radius of the object-side surface  111  of the first lens element  110  is R1, a curvature radius of the object-side surface  131  of the third lens element  130  is R5, the following condition is satisfied: R1/R5=1.74. 
     When the curvature radius of the object-side surface  111  of the first lens element  110  is R1, a curvature radius of the object-side surface  141  of the fourth lens element  140  is R7, the following condition is satisfied: R1/R7=−0.57. 
     When the focal length of the photographing lens assembly is f, the curvature radius of the object-side surface  131  of the third lens element  130  is R5, the following condition is satisfied: R5/f=0.16. 
     When a curvature radius of the object-side surface  121  of the second lens element  120  is R3, a curvature radius of the image-side surface  122  of the second lens element  120  is R4, the following condition is satisfied: (R3+R4)/(R3−R4)=0.26. 
     When the focal length of the photographing lens assembly is f, a focal length of the second lens element  120  is f2, the following condition is satisfied: f/f2=−4.67. 
     When a focal length of the first lens element  110  is f1, a focal length of the third lens element  130  is f3, the following condition is satisfied: f3/f1=0.70. 
     When the focal length of the photographing lens assembly is f, the focal length of the first lens element  110  is f1, the focal length of the second lens element  120  is f2, the focal length of the third lens element  130  is f3, the following condition is satisfied: (f/f1)−(f/f2)+(f/f3)=10.51. 
     When an axial distance between the image-side surface  152  of the fifth lens element  150  and the image surface  170  is BL, a maximum image height of the photographing lens assembly is ImgH, the following condition is satisfied: BL/ImgH =2.38. 
     When the axial distance between the image-side surface  152  of the fifth lens element  150  and the image surface  170  is BL, an axial distance between the object-side surface  111  of the first lens element  110  and the image-side surface  152  of the fifth lens element  150  is TD, the following condition is satisfied: BL/TD=1.51. 
     When an axial distance between the aperture stop  100  and the image-side surface  152  of the fifth lens element  150  is SD, the axial distance between the object-side surface  111  of the first lens element  110  and the image-side surface  152  of the fifth lens element  150  is TD, the following condition is satisfied: SD/TD=0.86. 
     When the focal length of the photographing lens assembly is f, the maximum image height of the photographing lens assembly is ImgH, the following condition is satisfied: ImgH/f=0.29. 
     When an entrance pupil diameter of the photographing lens assembly is EPD, the maximum image height of the photographing lens assembly is ImgH, the following condition is satisfied: EPD/ImgH=1.23. 
     When an axial distance between the object-side surface  111  of the first lens element  110  and the image surface  170  is TL, the focal length of the photographing lens assembly is f, the following condition is satisfied: TL/f=1.15. 
     When a maximum effective radius of the object-side surface  111  of the first lens element  110  is Y11, a maximum effective radius of the image-side surface  152  of the fifth lens element  150  is Y52, the following condition is satisfied: Y11/Y52=1.04. 
     When a vertical distance between a critical point on the image-side surface  142  of the fourth lens element  140  and an optical axis is Yc42, a central thickness of the fourth lens element  140  is CT4, the following condition is satisfied: Yc42/CT4 =1.02. 
     The detailed optical data of the 1st embodiment are shown in Table 1 and the aspheric surface data are shown in Table 2 below. 
     
       
         
           
               
             
               
                 TABLE 1 
               
             
            
               
                   
               
               
                 1st Embodiment 
               
               
                 f = 8.70 mm, Fno = 2.80, HFOV = 16.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Prism 
                 Plano 
                 5.000 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 2 
                   
                 Plano 
                 0.728 
               
               
                 3 
                 Ape. Stop 
                 Plano 
                 −0.544  
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 4 
                 Lens 1 
                 2.422 
                 (ASP) 
                 1.159 
                 Plastic 
                 1.545 
                 56.0 
                 3.61 
               
               
                 5 
                   
                 −8.705 
                 (ASP) 
                 0.173 
               
               
                 6 
                 Lens 2 
                 −3.316 
                 (ASP) 
                 0.440 
                 Plastic 
                 1.639 
                 23.3 
                 −1.86 
               
               
                 7 
                   
                 1.952 
                 (ASP) 
                 0.026 
               
               
                 8 
                 Lens 3 
                 1.393 
                 (ASP) 
                 0.870 
                 Plastic 
                 1.660 
                 20.4 
                 2.54 
               
               
                 9 
                   
                 6.250 
                 (ASP) 
                 0.209 
               
               
                 10 
                 Lens 4 
                 −4.219 
                 (ASP) 
                 0.387 
                 Plastic 
                 1.660 
                 20.4 
                 −10.27 
               
               
                 11 
                   
                 −11.583 
                 (ASP) 
                 0.344 
               
               
                 12 
                 Lens 5 
                 2.703 
                 (ASP) 
                 0.358 
                 Plastic 
                 1.544 
                 56.0 
                 −421.78 
               
               
                 13 
                   
                 2.547 
                 (ASP) 
                 0.300 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 14 
                 Prism 
                 Plano 
                 5.000 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 15 
                   
                 Plano 
                 0.200 
               
               
                 16 
                 IR-cut filter 
                 Plano 
                 0.150 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 17 
                   
                 Plano 
                 0.351 
               
               
                 18 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
               
                 At least one of the object-side prism 191 and the image-side prism 192 has a reflective surface. 
               
               
                 An effective radius of an object-side surface of the object-side prism 191 (Surface 1) is 2.500 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 2 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Surface # 
                 4 
                 5 
                 6 
                 7 
                 8 
               
               
                   
               
               
                 k = 
                  1.7277E−01 
                 5.5236E+00 
                 7.7056E−01 
                 −6.2812E−01 
                 −4.2910E−01 
               
               
                 A4 = 
                 −7.5993E−03 
                 2.8237E−02 
                 2.0711E−01 
                  8.3297E−02 
                 −1.2554E−01 
               
               
                 A6 = 
                  5.7350E−03 
                 5.5150E−02 
                 −1.5041E−01  
                 −9.5206E−02 
                  5.4731E−02 
               
               
                 A8 = 
                 −4.6931E−03 
                 −1.0651E−01  
                 3.6322E−02 
                  2.6670E−02 
                 −5.7145E−03 
               
               
                 A10 = 
                  1.6438E−03 
                 7.5159E−02 
                 1.9783E−02 
                  8.4069E−03 
                 −3.4473E−02 
               
               
                 A12 = 
                 −2.1852E−04 
                 −2.4002E−02  
                 −1.3318E−02  
                 −4.4653E−03 
                  2.6884E−02 
               
               
                 A14 = 
                 — 
                 2.8900E−03 
                 2.1240E−03 
                 −5.0502E−05 
                 −5.8470E−03 
               
               
                   
               
               
                 Surface # 
                 9 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k = 
                  9.8749E+00 
                 3.7447E+00 
                 −9.0000E+01  
                 −1.7624E+01 
                 −1.9305E+01 
               
               
                 A4 = 
                 −3.5765E−02 
                 1.6005E−01 
                 1.2604E−01 
                 −7.0369E−02 
                 −4.1117E−02 
               
               
                 A6 = 
                 −2.9067E−02 
                 −6.3326E−02  
                 5.1947E−02 
                  2.6102E−02 
                 −4.1814E−02 
               
               
                 A8 = 
                  1.3443E−01 
                 6.6987E−02 
                 −1.3381E−01  
                 −5.4556E−02 
                  4.2887E−02 
               
               
                 A10 = 
                 −1.6086E−01 
                 −9.9266E−02  
                 1.0893E−01 
                  5.5006E−02 
                 −2.4027E−02 
               
               
                 A12 = 
                  8.3122E−02 
                 6.5321E−02 
                 −4.4459E−02  
                 −2.6435E−02 
                  6.8681E−03 
               
               
                 A14 = 
                 −1.3921E−02 
                 −1.5050E−02  
                 7.0162E−03 
                  4.7166E−03 
                 −9.0605E−04 
               
               
                   
               
            
           
         
       
     
     In Table 1, the curvature radius, the thickness and the focal length are shown in millimeters (mm). Surface numbers 0-18 represent the surfaces sequentially arranged from the object-side to the image-side along the optical axis. In Table 2, k represents the conic coefficient of the equation of the aspheric surface profiles. A4-A14 represent the aspheric coefficients ranging from the 4th order to the 14th order. The tables presented below for each embodiment are the corresponding schematic parameter and aberration curves, and the definitions of the terms in the tables are the same as Table 1 and Table 2 of the 1st embodiment. Therefore, an explanation in this regard will not be provided again. 
     2nd Embodiment 
       FIG. 3  is a schematic view of an image capturing unit according to the 2nd embodiment of the present disclosure.  FIG. 3A  is a schematic view of the image capturing unit with another configuration of prism according to the 2nd embodiment of the present disclosure.  FIG. 3B  is a schematic view of the image capturing unit with still another configuration of prism according to the 2nd embodiment of the present disclosure.  FIG. 4  shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 2nd embodiment. In  FIG. 3  to  FIG. 3B , the image capturing unit includes the photographing lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  280 . The photographing lens assembly includes, in order from an object side to an image side, an object-side prism  291 , a first lens element  210 , an aperture stop  200 , a second lens element  220 , a third lens element  230 , a fourth lens element  240 , a fifth lens element  250 , an image-side prism  292 , an IR-cut filter  260  and an image surface  270 . The photographing lens assembly includes five lens elements ( 210 - 250 ) with no additional lens element disposed between the first lens element  210  and the fifth lens element  250 . 
     The first lens element  210  with positive refractive power has an object-side surface  211  being convex in a paraxial region thereof and an image-side surface  212  being convex in a paraxial region thereof. The first lens element  210  is made of plastic material and has the object-side surface  211  and the image-side surface  212  being both aspheric. The image-side surface  212  of the first lens element  210  has at least one inflection point. 
     The second lens element  220  with negative refractive power has an object-side surface  221  being concave in a paraxial region thereof and an image-side surface  222  being concave in a paraxial region thereof. The second lens element  220  is made of plastic material and has the object-side surface  221  and the image-side surface  222  being both aspheric. The object-side surface  221  of the second lens element  220  has at least one inflection point. 
     The third lens element  230  with positive refractive power has an object-side surface  231  being convex in a paraxial region thereof and an image-side surface  232  being concave in a paraxial region thereof. The third lens element  230  is made of plastic material and has the object-side surface  231  and the image-side surface  232  being both aspheric. The object-side surface  231  of the third lens element  230  has at least one inflection point. 
     The fourth lens element  240  with positive refractive power has an object-side surface  241  being convex in a paraxial region thereof and an image-side surface  242  being convex in a paraxial region thereof. The fourth lens element  240  is made of plastic material and has the object-side surface  241  and the image-side surface  242  being both aspheric. The object-side surface  241  of the fourth lens element  240  has at least one inflection point. The image-side surface  242  of the fourth lens element  240  has at least one concave shape in an off-axial region thereof. The image-side surface  242  of the fourth lens element  240  has at least one concave critical point in an off-axial region thereof. 
     The fifth lens element  250  with negative refractive power has an object-side surface  251  being convex in a paraxial region thereof and an image-side surface  252  being concave in a paraxial region thereof. The fifth lens element  250  is made of plastic material and has the object-side surface  251  and the image-side surface  252  being both aspheric. The object-side surface  251  of the fifth lens element  250  has at least one concave shape in an off-axial region thereof. The image-side surface  252  of the fifth lens element  250  has at least one convex shape in an off-axial region thereof. 
     The IR-cut filter  260  is made of glass material and located between the fifth lens element  250  and the image surface  270 , and will not affect the focal length of the photographing lens assembly. The image sensor  280  is disposed on or near the image surface  270  of the photographing lens assembly. 
     Both the object-side prism  291  and the image-side prism  292  are made of glass material. In  FIG. 3 , a configuration of the object-side prism  291  and the image-side prism  292  in the image capturing unit is for extending the optical axis. In  FIG. 3A  and  FIG. 3B , a configuration of the object-side prism  291  and the image-side prism  292  in the image capturing unit is for changing the direction of the optical axis. 
     The detailed optical data of the 2nd embodiment are shown in Table 3 and the aspheric surface data are shown in Table 4 below. 
     
       
         
           
               
             
               
                 TABLE 3 
               
             
            
               
                   
               
               
                 2nd Embodiment 
               
               
                 f = 9.15 mm, Fno = 2.80, HFOV = 15.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Prism 
                 Plano 
                 5.000 
                 Glass 
                 1.559 
                 40.4 
                 — 
               
               
                 2 
                   
                 Plano 
                 0.200 
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 3 
                 Lens 1 
                 2.470 
                 (ASP) 
                 1.375 
                 Plastic 
                 1.545 
                 56.0 
                 4.04 
               
               
                 4 
                   
                 −16.381 
                 (ASP) 
                 0.096 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 5 
                 Ape. Stop 
                 Plano 
                 0.122 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 6 
                 Lens 2 
                 −3.784 
                 (ASP) 
                 0.350 
                 Plastic 
                 1.639 
                 23.3 
                 −3.41 
               
               
                 7 
                   
                 5.310 
                 (ASP) 
                 0.045 
               
               
                 8 
                 Lens 3 
                 1.987 
                 (ASP) 
                 0.510 
                 Plastic 
                 1.660 
                 20.4 
                 6.49 
               
               
                 9 
                   
                 3.329 
                 (ASP) 
                 0.164 
               
               
                 10 
                 Lens 4 
                 169.384 
                 (ASP) 
                 0.500 
                 Plastic 
                 1.671 
                 19.5 
                 246.02 
               
               
                 11 
                   
                 −6409.622 
                 (ASP) 
                 0.240 
               
               
                 12 
                 Lens 5 
                 9.972 
                 (ASP) 
                 0.500 
                 Plastic 
                 1.584 
                 28.2 
                 −11.31 
               
               
                 13 
                   
                 3.901 
                 (ASP) 
                 0.400 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 14 
                 Prism 
                 Plano 
                 5.000 
                 Glass 
                 1.559 
                 40.4 
                 — 
               
               
                 15 
                   
                 Plano 
                 0.350 
               
               
                 16 
                 IR-cut filter 
                 Plano 
                 0.110 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 17 
                   
                 Plano 
                 0.350 
               
               
                 18 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
               
                 At least one of the object-side prism 291 and the image-side prism 292 has a reflective surface. 
               
               
                 An effective radius of an object-side surface of the object-side prism 291 (Surface 1) is 2.500 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 4 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Surface # 
                 3 
                 4 
                 6 
                 7 
                 8 
               
               
                   
               
               
                 k = 
                  2.3007E−01 
                 −1.2832E+01  
                 −1.8587E+00  
                 −4.9766E−01  
                 −6.7275E−01 
               
               
                 A4 = 
                 −6.3911E−03 
                 2.9921E−02 
                 2.1187E−01 
                 8.1243E−02 
                 −1.3478E−01 
               
               
                 A6 = 
                  6.1418E−03 
                 5.5882E−02 
                 −1.5308E−01  
                 −9.7350E−02  
                  5.0827E−02 
               
               
                 A8 = 
                 −4.8805E−03 
                 −1.0639E−01  
                 3.4717E−02 
                 2.2222E−02 
                  1.7035E−03 
               
               
                 A10 = 
                  1.6399E−03 
                 7.4521E−02 
                 1.9417E−02 
                 9.9607E−03 
                 −3.2226E−02 
               
               
                 A12 = 
                 −2.2872E−04 
                 −2.4436E−02  
                 −1.3341 E−02     
                 −3.7761E−03  
                  2.6761 E−02 
               
               
                 A14 = 
                   
                 3.0842E−03 
                 2.2774E−03 
                 6.1958E−04 
                 −5.7660E−03 
               
               
                   
               
               
                 Surface # 
                 9 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k = 
                  4.8902E+00 
                 −9.0000E+01 
                 −9.0000E+01  
                 −1.6271E+01 
                 −1.9802E+01 
               
               
                 A4 = 
                 −2.7609E−02 
                  1.3054E−01 
                 1.1649E−01 
                 −4.8428E−02 
                 −3.2406E−02 
               
               
                 A6 = 
                 −3.1918E−02 
                 −5.0160E−02 
                 4.2535E−02 
                  8.5686E−02 
                  2.7881E−02 
               
               
                 A8 = 
                  1.2981E−01 
                  6.8676E−02 
                 −1.2998E−01  
                 −1.5516E−01 
                 −4.7107E−02 
               
               
                 A10 = 
                 −1.5861E−01 
                 −1.0117E−01 
                 1.0900E−01 
                  1.3863E−01 
                  3.9528E−02 
               
               
                 A12 = 
                  8.5551E−02 
                  6.1810E−02 
                 −4.4954E−02  
                 −5.9815E−02 
                 −1.6127E−02 
               
               
                 A14 = 
                 −1.6072E−02 
                 −1.3613E−02 
                 6.8919E−03 
                  1.0260E−02 
                  2.5976E−03 
               
               
                   
               
            
           
         
       
     
     In the 2nd embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 2nd embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 3 and Table 4 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 2nd Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 9.15 
                 f/f2 
                 −2.68 
               
               
                 Fno 
                 2.80 
                 f3/f1 
                 1.60 
               
               
                 HFOV [deg.] 
                 15.0 
                 (f/f1) − (f/f2) + (f/f3) 
                 6.36 
               
               
                 (V2 + V3 + V4 + V5)/V1 
                 1.63 
                 BL/ImgH 
                 2.47 
               
               
                 CT1/CT2 
                 3.93 
                 BL/TD 
                 1.59 
               
               
                 T34/T45 
                 0.68 
                 SD/TD 
                 0.62 
               
               
                 ΣAT/CT1 
                 0.49 
                 ImgH/f 
                 0.28 
               
               
                 ΣAT/ΣCT 
                 0.21 
                 EPD/ImgH 
                 1.30 
               
               
                 R1/R5 
                 1.24 
                 TL/f 
                 1.11 
               
               
                 R1/R7 
                 0.01 
                 Y11/Y52 
                 1.20 
               
               
                 R5/f 
                 0.22 
                 Yc42/CT4 
                 0.03 
               
               
                 (R3 + R4)/(R3 − R4) 
                 −0.17 
                 — 
                 — 
               
               
                   
               
            
           
         
       
     
     3rd Embodiment 
       FIG. 5  is a schematic view of an image capturing unit according to the 3rd embodiment of the present disclosure.  FIG. 6  shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 3rd embodiment. In  FIG. 5 , the image capturing unit includes the photographing lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  380 . The photographing lens assembly includes, in order from an object side to an image side, an aperture stop  300 , a first lens element  310 , a second lens element  320 , a third lens element  330 , a fourth lens element  340 , a fifth lens element  350 , an IR-cut filter  360  and an image surface  370 . The photographing lens assembly includes five lens elements ( 310 - 350 ) with no additional lens element disposed between the first lens element  310  and the fifth lens element  350 . 
     The first lens element  310  with positive refractive power has an object-side surface  311  being convex in a paraxial region thereof and an image-side surface  312  being convex in a paraxial region thereof. The first lens element  310  is made of plastic material and has the object-side surface  311  and the image-side surface  312  being both aspheric. The image-side surface  312  of the first lens element  310  has at least one inflection point. 
     The second lens element  320  with negative refractive power has an object-side surface  321  being concave in a paraxial region thereof and an image-side surface  322  being concave in a paraxial region thereof. The second lens element  320  is made of plastic material and has the object-side surface  321  and the image-side surface  322  being both aspheric. Both the object-side surface  321  and the image-side surface  322  of the second lens element  320  have at least one inflection point. 
     The third lens element  330  with positive refractive power has an object-side surface  331  being convex in a paraxial region thereof and an image-side surface  332  being concave in a paraxial region thereof. The third lens element  330  is made of plastic material and has the object-side surface  331  and the image-side surface  332  being both aspheric. The object-side surface  331  of the third lens element  330  has at least one inflection point. 
     The fourth lens element  340  with positive refractive power has an object-side surface  341  being concave in a paraxial region thereof and an image-side surface  342  being convex in a paraxial region thereof. The fourth lens element  340  is made of plastic material and has the object-side surface  341  and the image-side surface  342  being both aspheric. The object-side surface  341  of the fourth lens element  340  has at least one inflection point. The image-side surface  342  of the fourth lens element  340  has at least one concave shape in an off-axial region thereof. The image-side surface  342  of the fourth lens element  340  has at least one concave critical point in an off-axial region thereof. 
     The fifth lens element  350  with negative refractive power has an object-side surface  351  being convex in a paraxial region thereof and an image-side surface  352  being concave in a paraxial region thereof. The fifth lens element  350  is made of plastic material and has the object-side surface  351  and the image-side surface  352  being both aspheric. The object-side surface  351  of the fifth lens element  350  has at least one concave shape in an off-axial region thereof. The image-side surface  352  of the fifth lens element  350  has at least one convex shape in an off-axial region thereof. 
     The IR-cut filter  360  is made of glass material and located between the fifth lens element  350  and the image surface  370 , and will not affect the focal length of the photographing lens assembly. The image sensor  380  is disposed on or near the image surface  370  of the photographing lens assembly. 
     The detailed optical data of the 3rd embodiment are shown in Table 5 and the aspheric surface data are shown in Table 6 below. 
     
       
         
           
               
             
               
                 TABLE 5 
               
             
            
               
                   
               
               
                 3rd Embodiment 
               
               
                 f = 8.55 mm, Fno = 2.70, HFOV = 16.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal Length 
               
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.540  
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 2.430 
                 (ASP) 
                 1.344 
                 Plastic 
                 1.545 
                 56.0 
                 3.48 
               
               
                 3 
                   
                 −6.906 
                 (ASP) 
                 0.162 
               
               
                 4 
                 Lens 2 
                 −2.896 
                 (ASP) 
                 0.351 
                 Plastic 
                 1.639 
                 23.3 
                 −1.93 
               
               
                 5 
                   
                 2.239 
                 (ASP) 
                 0.076 
               
               
                 6 
                 Lens 3 
                 1.669 
                 (ASP) 
                 0.668 
                 Plastic 
                 1.660 
                 20.4 
                 3.46 
               
               
                 7 
                   
                 5.199 
                 (ASP) 
                 0.172 
               
               
                 8 
                 Lens 4 
                 −3.184 
                 (ASP) 
                 0.438 
                 Plastic 
                 1.660 
                 20.4 
                 82.18 
               
               
                 9 
                   
                 −3.172 
                 (ASP) 
                 0.196 
               
               
                 10 
                 Lens 5 
                 2.641 
                 (ASP) 
                 0.404 
                 Plastic 
                 1.544 
                 56.0 
                 −51.42 
               
               
                 11 
                   
                 2.283 
                 (ASP) 
                 0.700 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 12 
                 IR-cut filter 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 13 
                   
                 Plano 
                 3.830 
               
               
                 14 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 6 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 k = 
                  1.4446E−01 
                 −2.5604E−01  
                 9.2061E−01 
                 −8.8366E−01 
                 −3.8295E−01 
               
               
                 A4 = 
                 −7.9008E−03 
                 3.0393E−02 
                 2.0820E−01 
                  7.9153E−02 
                 −1.2070E−01 
               
               
                 A6 = 
                  5.6835E−03 
                 5.4333E−02 
                 −1.5174E−01  
                 −9.3916E−02 
                  4.7096E−02 
               
               
                 A8 = 
                 −5.0124E−03 
                 −1.0759E−01  
                 3.6837E−02 
                  2.1895E−02 
                 −4.1864E−03 
               
               
                 A10 = 
                  1.8402E−03 
                 7.5231E−02 
                 1.9919E−02 
                  9.0233E−03 
                 −3.4208E−02 
               
               
                 A12 = 
                 −2.9723E−04 
                 −2.4053E−02  
                 −1.3274E−02  
                 −3.7631E−03 
                  2.6753E−02 
               
               
                 A14 = 
                 — 
                 2.8709E−03 
                 2.0404E−03 
                 −8.3323E−05 
                 −5.6660E−03 
               
               
                   
               
               
                 Surface # 
                 7 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                  1.1936E+01 
                 −7.2888E−02 
                 1.4405E+00 
                 −1.7624E+01 
                 −1.9305E+01 
               
               
                 A4 = 
                 −4.7603E−02 
                  1.6359E−01 
                 1.1773E−01 
                 −8.5657E−02 
                 −1.8888E−02 
               
               
                 A6 = 
                 −2.9713E−02 
                 −5.8140E−02 
                 5.2588E−02 
                  3.9521E−02 
                 −8.5908E−02 
               
               
                 A8 = 
                  1.2909E−01 
                  7.2076E−02 
                 −1.3323E−01  
                 −1.2038E−01 
                  8.7693E−02 
               
               
                 A10 = 
                 −1.5822E−01 
                 −1.0081E−01 
                 1.1007E−01 
                  1.3073E−01 
                 −4.8790E−02 
               
               
                 A12 = 
                  8.4398E−02 
                  6.4385E−02 
                 −4.2973E−02  
                 −6.7454E−02 
                  1.4388E−02 
               
               
                 A14 = 
                 −1.5933E−02 
                 −1.4254E−02 
                 7.2849E−03 
                  1.3853E−02 
                 −1.7609E−03 
               
               
                   
               
            
           
         
       
     
     In the 3rd embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 3rd embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 5 and Table 6 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 3rd Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 8.55 
                 f/f2 
                 −4.44 
               
               
                 Fno 
                 2.70 
                 f3/f1 
                 1.00 
               
               
                 HFOV [deg.] 
                 16.0 
                 (f/f1) − (f/f2) + (f/f3) 
                 9.36 
               
               
                 (V2 + V3 + V4 + V5)/V1 
                 2.14 
                 BL/ImgH 
                 1.92 
               
               
                 CT1/CT2 
                 3.83 
                 BL/TD 
                 1.27 
               
               
                 T34/T45 
                 0.88 
                 SD/TD 
                 0.86 
               
               
                 ΣAT/CT1 
                 0.45 
                 ImgH/f 
                 0.29 
               
               
                 ΣAT/ΣCT 
                 0.19 
                 EPD/ImgH 
                 1.26 
               
               
                 R1/R5 
                 1.46 
                 TL/f 
                 1.01 
               
               
                 R1/R7 
                 −0.76 
                 Y11/Y52 
                 1.04 
               
               
                 R5/f 
                 0.20 
                 Yc42/CT4 
                 2.09 
               
               
                 (R3 + R4)/(R3 − R4) 
                 0.13 
                 — 
                 — 
               
               
                   
               
            
           
         
       
     
     4th Embodiment 
       FIG. 7  is a schematic view of an image capturing unit according to the 4th embodiment of the present disclosure.  FIG. 8  shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 4th embodiment. In  FIG. 7 , the image capturing unit includes the photographing lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  480 . The photographing lens assembly includes, in order from an object side to an image side, an aperture stop  400 , a first lens element  410 , a second lens element  420 , a third lens element  430 , a fourth lens element  440 , a fifth lens element  450 , an IR-cut filter  460  and an image surface  470 . The photographing lens assembly includes five lens elements ( 410 - 450 ) with no additional lens element disposed between the first lens element  410  and the fifth lens element  450 . 
     The first lens element  410  with positive refractive power has an object-side surface  411  being convex in a paraxial region thereof and an image-side surface  412  being convex in a paraxial region thereof. The first lens element  410  is made of plastic material and has the object-side surface  411  and the image-side surface  412  being both aspheric. The image-side surface  412  of the first lens element  410  has at least one inflection point. 
     The second lens element  420  with negative refractive power has an object-side surface  421  being concave in a paraxial region thereof and an image-side surface  422  being concave in a paraxial region thereof. The second lens element  420  is made of plastic material and has the object-side surface  421  and the image-side surface  422  being both aspheric. Both the object-side surface  421  and the image-side surface  422  of the second lens element  420  have at least one inflection point. 
     The third lens element  430  with positive refractive power has an object-side surface  431  being convex in a paraxial region thereof and an image-side surface  432  being convex in a paraxial region thereof. The third lens element  430  is made of plastic material and has the object-side surface  431  and the image-side surface  432  being both aspheric. Both the object-side surface  431  and the image-side surface  432  of the third lens element  430  have at least one inflection point. 
     The fourth lens element  440  with negative refractive power has an object-side surface  441  being concave in a paraxial region thereof and an image-side surface  442  being convex in a paraxial region thereof. The fourth lens element  440  is made of plastic material and has the object-side surface  441  and the image-side surface  442  being both aspheric. The object-side surface  441  of the fourth lens element  440  has at least one inflection point. The image-side surface  442  of the fourth lens element  440  has at least one concave shape in an off-axial region thereof. The image-side surface  442  of the fourth lens element  440  has at least one concave critical point in an off-axial region thereof. 
     The fifth lens element  450  with positive refractive power has an object-side surface  451  being convex in a paraxial region thereof and an image-side surface  452  being concave in a paraxial region thereof. The fifth lens element  450  is made of plastic material and has the object-side surface  451  and the image-side surface  452  being both aspheric. The object-side surface  451  of the fifth lens element  450  has at least one concave shape in an off-axial region thereof. The image-side surface  452  of the fifth lens element  450  has at least one convex shape in an off-axial region thereof. 
     The IR-cut filter  460  is made of glass material and located between the fifth lens element  450  and the image surface  470 , and will not affect the focal length of the photographing lens assembly. The image sensor  480  is disposed on or near the image surface  470  of the photographing lens assembly. 
     The detailed optical data of the 4th embodiment are shown in Table 7 and the aspheric surface data are shown in Table 8 below. 
     
       
         
           
               
             
               
                 TABLE 7 
               
             
            
               
                   
               
               
                 4th Embodiment 
               
               
                 f = 8.55 mm, Fno = 2.80, HFOV = 16.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal Length 
               
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.513  
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 2.409 
                 (ASP) 
                 1.070 
                 Plastic 
                 1.545 
                 56.1 
                 3.50 
               
               
                 3 
                   
                 −7.756 
                 (ASP) 
                 0.191 
               
               
                 4 
                 Lens 2 
                 −2.995 
                 (ASP) 
                 0.350 
                 Plastic 
                 1.639 
                 23.3 
                 −1.88 
               
               
                 5 
                   
                 2.104 
                 (ASP) 
                 0.084 
               
               
                 6 
                 Lens 3 
                 1.644 
                 (ASP) 
                 0.785 
                 Plastic 
                 1.660 
                 20.4 
                 2.39 
               
               
                 7 
                   
                 −31.112 
                 (ASP) 
                 0.162 
               
               
                 8 
                 Lens 4 
                 −1.779 
                 (ASP) 
                 0.500 
                 Plastic 
                 1.660 
                 20.4 
                 −6.86 
               
               
                 9 
                   
                 −3.256 
                 (ASP) 
                 0.149 
               
               
                 10 
                 Lens 5 
                 2.800 
                 (ASP) 
                 0.500 
                 Plastic 
                 1.544 
                 56.0 
                 89.56 
               
               
                 11 
                   
                 2.784 
                 (ASP) 
                 4.300 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 12 
                 IR-cut filter 
                 Plano 
                 0.210 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 13 
                   
                 Plano 
                 0.418 
               
               
                 14 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 8 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 k = 
                  1.2591E−01 
                 −2.8080E+00  
                 9.6910E−01 
                 −1.3401E+00  
                 −3.3811E−01 
               
               
                 A4 = 
                 −8.2423E−03 
                 3.1695E−02 
                 2.0831E−01 
                 7.3958E−02 
                 −1.1491E−01 
               
               
                 A6 = 
                  6.7924E−03 
                 5.5186E−02 
                 −1.5136E−01  
                 −9.0460E−02  
                  4.1347E−02 
               
               
                 A8 = 
                 −5.8777E−03 
                 −1.0820E−01  
                 3.7095E−02 
                 2.2936E−02 
                 −3.9655E−03 
               
               
                 A10 = 
                  2.1902E−03 
                 7.5407E−02 
                 1.9042E−02 
                 1.0376E−02 
                 −3.4758E−02 
               
               
                 A12 = 
                 −3.2943E−04 
                 −2.4094E−02  
                 −1.3248E−02  
                 −6.0129E−03  
                  2.7014E−02 
               
               
                 A14 = 
                 — 
                 2.9176E−03 
                 2.1559E−03 
                 4.5728E−04 
                 −5.7006E−03 
               
               
                   
               
               
                 Surface # 
                 7 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                 −9.0000E+01 
                 −7.7648E−01 
                 4.7175E−01 
                 −1.9896E+01 
                 −2.2382E+01 
               
               
                 A4 = 
                 −5.6589E−02 
                  1.7107E−01 
                 1.1975E−01 
                 −7.3974E−02 
                 −3.0675E−02 
               
               
                 A6 = 
                 −2.1011E−02 
                 −6.5390E−02 
                 6.4772E−02 
                  1.3379E−02 
                 −5.2949E−02 
               
               
                 A8 = 
                  1.2841E−01 
                  7.3109E−02 
                 −1.3807E−01  
                 −4.4419E−02 
                  6.6580E−02 
               
               
                 A10 = 
                 −1.5851E−01 
                 −1.0005E−01 
                 1.0666E−01 
                  5.5908E−02 
                 −4.3533E−02 
               
               
                 A12 = 
                  8.4918E−02 
                  6.4030E−02 
                 −4.3274E−02  
                 −3.4803E−02 
                  1.4433E−02 
               
               
                 A14 = 
                 −1.5999E−02 
                 −1.4388E−02 
                 7.9497E−03 
                  8.4764E−03 
                 −1.9149E−03 
               
               
                   
               
            
           
         
       
     
     In the 4th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 4th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 7 and Table 8 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 4th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 8.55 
                 f/f2 
                 −4.54 
               
               
                 Fno 
                 2.80 
                 f3/f1 
                 0.68 
               
               
                 HFOV [deg.] 
                 16.0 
                 (f/f1) − (f/f2) + (f/f3) 
                 10.56 
               
               
                 (V2 + V3 + V4 + V5)/V1 
                 2.14 
                 BL/ImgH 
                 1.96 
               
               
                 CT1/CT2 
                 3.06 
                 BL/TD 
                 1.30 
               
               
                 T34/T45 
                 1.09 
                 SD/TD 
                 0.86 
               
               
                 ΣAT/CT1 
                 0.55 
                 ImgH/f 
                 0.29 
               
               
                 ΣAT/ΣCT 
                 0.18 
                 EPD/ImgH 
                 1.21 
               
               
                 R1/R5 
                 1.47 
                 TL/f 
                 1.02 
               
               
                 R1/R7 
                 −1.35 
                 Y11/Y52 
                 1.01 
               
               
                 R5/f 
                 0.19 
                 Yc42/CT4 
                 1.65 
               
               
                 (R3 + R4)/(R3 − R4) 
                 0.17 
                 — 
                 — 
               
               
                   
               
            
           
         
       
     
     5th Embodiment 
       FIG. 9  is a schematic view of an image capturing unit according to the 5th embodiment of the present disclosure.  FIG. 9A  is a schematic view of the image capturing unit with another configuration of prism according to the 5th embodiment of the present disclosure.  FIG. 10  shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the  5 th embodiment. In  FIG. 9  and  FIG. 9A , the image capturing unit includes the photographing lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  580 . The photographing lens assembly includes, in order from an object side to an image side, an aperture stop  500 , a first lens element  510 , a second lens element  520 , a third lens element  530 , a fourth lens element  540 , a fifth lens element  550 , an image-side prism  592 , an IR-cut filter  560  and an image surface  570 . The photographing lens assembly includes five lens elements ( 510 - 550 ) with no additional lens element disposed between the first lens element  510  and the fifth lens element  550 . 
     The first lens element  510  with positive refractive power has an object-side surface  511  being convex in a paraxial region thereof and an image-side surface  512  being convex in a paraxial region thereof. The first lens element  510  is made of plastic material and has the object-side surface  511  and the image-side surface  512  being both aspheric. The image-side surface  512  of the first lens element  510  has at least one inflection point. 
     The second lens element  520  with negative refractive power has an object-side surface  521  being concave in a paraxial region thereof and an image-side surface  522  being convex in a paraxial region thereof. The second lens element  520  is made of plastic material and has the object-side surface  521  and the image-side surface  522  being both aspheric. Both the object-side surface  521  and the image-side surface  522  of the second lens element  520  have at least one inflection point. 
     The third lens element  530  with negative refractive power has an object-side surface  531  being convex in a paraxial region thereof and an image-side surface  532  being concave in a paraxial region thereof. The third lens element  530  is made of plastic material and has the object-side surface  531  and the image-side surface  532  being both aspheric. Both the object-side surface  531  and the image-side surface  532  of the third lens element  530  have at least one inflection point. 
     The fourth lens element  540  with positive refractive power has an object-side surface  541  being concave in a paraxial region thereof and an image-side surface  542  being convex in a paraxial region thereof. The fourth lens element  540  is made of plastic material and has the object-side surface  541  and the image-side surface  542  being both aspheric. The object-side surface  541  of the fourth lens element  540  has at least one inflection point. The image-side surface  542  of the fourth lens element  540  has at least one concave shape in an off-axial region thereof. The image-side surface  542  of the fourth lens element  540  has at least one concave critical point in an off-axial region thereof. 
     The fifth lens element  550  with negative refractive power has an object-side surface  551  being concave in a paraxial region thereof and an image-side surface  552  being convex in a paraxial region thereof. The fifth lens element  550  is made of plastic material and has the object-side surface  551  and the image-side surface  552  being both aspheric. The object-side surface  551  of the fifth lens element  550  has at least one inflection point. 
     The IR-cut filter  560  is made of glass material and located between the fifth lens element  550  and the image surface  570 , and will not affect the focal length of the photographing lens assembly. The image sensor  580  is disposed on or near the image surface  570  of the photographing lens assembly. 
     The image-side prism  592  is made of glass material. In  FIG. 9 , a configuration of the image-side prism  592  in the image capturing unit is for extending the optical axis. In  FIG. 9A , a configuration of the image-side prism  592  in the image capturing unit is for changing the direction of the optical axis. 
     The detailed optical data of the 5th embodiment are shown in Table 9 and the aspheric surface data are shown in Table 10 below. 
     
       
         
           
               
             
               
                 TABLE 9 
               
             
            
               
                   
               
               
                 5th Embodiment 
               
               
                 f = 8.81 mm, Fno = 2.82, HFOV = 13.9 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal Length 
               
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.655  
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 2.114 
                 (ASP) 
                 1.384 
                 Plastic 
                 1.545 
                 56.1 
                 3.76 
               
               
                 3 
                   
                 −49.725 
                 (ASP) 
                 0.241 
               
               
                 4 
                 Lens 2 
                 −2.899 
                 (ASP) 
                 0.400 
                 Plastic 
                 1.639 
                 23.3 
                 −5.97 
               
               
                 5 
                   
                 −12.733 
                 (ASP) 
                 0.249 
               
               
                 6 
                 Lens 3 
                 3.247 
                 (ASP) 
                 0.390 
                 Plastic 
                 1.544 
                 56.0 
                 −13.73 
               
               
                 7 
                   
                 2.167 
                 (ASP) 
                 0.217 
               
               
                 8 
                 Lens 4 
                 −8.258 
                 (ASP) 
                 0.500 
                 Plastic 
                 1.660 
                 20.4 
                 10.11 
               
               
                 9 
                   
                 −3.780 
                 (ASP) 
                 0.486 
               
               
                 10 
                 Lens 5 
                 −4.626 
                 (ASP) 
                 0.400 
                 Plastic 
                 1.639 
                 23.3 
                 −11.13 
               
               
                 11 
                   
                 −13.690 
                 (ASP) 
                 0.200 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 12 
                 Prism 
                 Plano 
                 4.000 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 13 
                   
                 Plano 
                 0.400 
               
               
                 14 
                 IR-cut filter 
                 Plano 
                 0.210 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 15 
                   
                 Plano 
                 0.491 
               
               
                 16 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
               
                 The image-side prism 592 has a reflective surface. 
               
               
                 An effective radius of an image-side surface of the image-side prism 592 (Surface 13) is 2.000 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 10 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 k = 
                  0.0000E+00 
                 0.0000E+00 
                  0.0000E+00 
                 0.0000E+00 
                 0.0000E+00 
               
               
                 A4 = 
                 −2.8238E−03 
                 7.5348E−03 
                  2.4225E−01 
                 3.3905E−01 
                 4.4463E−02 
               
               
                 A6 = 
                  6.9578E−04 
                 1.1869E−02 
                 −2.0420E−01 
                 −3.1857E−01  
                 −2.8814E−01  
               
               
                 A8 = 
                 −4.5453E−04 
                 −3.2647E−02  
                  8.3610E−02 
                 1.5638E−01 
                 2.3687E−01 
               
               
                 A10 = 
                  2.0618E−05 
                 2.0423E−02 
                 −8.2469E−03 
                 −2.9640E−02  
                 −1.4546E−01  
               
               
                 A12 = 
                 −2.0054E−06 
                 −4.0623E−03  
                 −2.1723E−03 
                 5.2027E−05 
                 7.7320E−02 
               
               
                 A14 = 
                 — 
                 — 
                 — 
                 — 
                 −1.7154E−02  
               
               
                   
               
               
                 Surface # 
                 7 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                 0.0000E+00 
                 0.0000E+00 
                 0.0000E+00 
                 0.0000E+00 
                 0.0000E+00 
               
               
                 A4 = 
                 −5.3510E−02  
                 1.1535E−01 
                 6.2763E−02 
                 −1.0020E−01  
                 −8.6628E−02  
               
               
                 A6 = 
                 −1.0991E−01  
                 −1.8694E−02  
                 1.6831E−02 
                 1.6433E−02 
                 3.0927E−02 
               
               
                 A8 = 
                 2.2055E−03 
                 −6.3320E−03  
                 −2.0014E−03  
                 1.0384E−02 
                 −1.6455E−02  
               
               
                 A10 = 
                 9.6551E−02 
                 9.1838E−03 
                 3.4418E−02 
                 −2.0554E−02  
                 7.6343E−03 
               
               
                 A12 = 
                 −7.3826E−02  
                 −7.7795E−03  
                 −3.4516E−02  
                 1.5956E−02 
                 −2.1476E−03  
               
               
                 A14 = 
                 2.2575E−02 
                 2.5949E−03 
                 8.6862E−03 
                 −3.4514E−03  
                 2.8927E−04 
               
               
                   
               
            
           
         
       
     
     In the 5th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 5th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 9 and Table 10 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 5th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 8.81 
                 f/f2 
                 −1.48 
               
               
                 Fno 
                 2.82 
                 f3/f1 
                 −3.66 
               
               
                 HFOV [deg.] 
                 13.9 
                 (f/f1) − (f/f2) + (f/f3) 
                 3.18 
               
               
                 (V2 + V3 + V4 + V5)/V1 
                 2.19 
                 BL/ImgH 
                 2.41 
               
               
                 CT1/CT2 
                 3.46 
                 BL/TD 
                 1.24 
               
               
                 T34/T45 
                 0.45 
                 SD/TD 
                 0.85 
               
               
                 ΣAT/CT1 
                 0.86 
                 ImgH/f 
                 0.25 
               
               
                 ΣAT/ΣCT 
                 0.39 
                 EPD/ImgH 
                 1.42 
               
               
                 R1/R5 
                 0.65 
                 TL/f 
                 1.09 
               
               
                 R1/R7 
                 −0.26 
                 Y11/Y52 
                 1.12 
               
               
                 R5/f 
                 0.37 
                 Yc42/CT4 
                 3.65 
               
               
                 (R3 + R4)/(R3 − R4) 
                 −1.59 
                 — 
                 — 
               
               
                   
               
            
           
         
       
     
     6th Embodiment 
       FIG. 11  is a schematic view of an image capturing unit according to the 6th embodiment of the present disclosure.  FIG. 11A  is a schematic view of the image capturing unit with another configuration of prism according to the 6th embodiment of the present disclosure.  FIG. 11B  is a schematic view of the image capturing unit with still another configuration of prism according to the  6 th embodiment of the present disclosure.  FIG. 12  shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the  6 th embodiment. In  FIG. 11  to  FIG. 11B , the image capturing unit includes the photographing lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  680 . The photographing lens assembly includes, in order from an object side to an image side, an object-side prism  691 , an aperture stop  600 , a first lens element  610 , a second lens element  620 , a third lens element  630 , a fourth lens element  640 , a fifth lens element  650 , an image-side prism  692 , an IR-cut filter  660  and an image surface  670 . The photographing lens assembly includes five lens elements ( 610 - 650 ) with no additional lens element disposed between the first lens element  610  and the fifth lens element  650 . 
     The first lens element  610  with positive refractive power has an object-side surface  611  being convex in a paraxial region thereof and an image-side surface  612  being concave in a paraxial region thereof. The first lens element  610  is made of plastic material and has the object-side surface  611  and the image-side surface  612  being both aspheric. The image-side surface  612  of the first lens element  610  has at least one inflection point. 
     The second lens element  620  with negative refractive power has an object-side surface  621  being concave in a paraxial region thereof and an image-side surface  622  being convex in a paraxial region thereof. The second lens element  620  is made of plastic material and has the object-side surface  621  and the image-side surface  622  being both aspheric. Both the object-side surface  621  and the image-side surface  622  of the second lens element  620  have at least one inflection point. 
     The third lens element  630  with positive refractive power has an object-side surface  631  being convex in a paraxial region thereof and an image-side surface  632  being concave in a paraxial region thereof. The third lens element  630  is made of plastic material and has the object-side surface  631  and the image-side surface  632  being both aspheric. Both the object-side surface  631  and the image-side surface  632  of the third lens element  630  have at least one inflection point. 
     The fourth lens element  640  with positive refractive power has an object-side surface  641  being concave in a paraxial region thereof and an image-side surface  642  being convex in a paraxial region thereof. The fourth lens element  640  is made of plastic material and has the object-side surface  641  and the image-side surface  642  being both aspheric. The object-side surface  641  of the fourth lens element  640  has at least one inflection point. The image-side surface  642  of the fourth lens element  640  has at least one concave shape in an off-axial region thereof. The image-side surface  642  of the fourth lens element  640  has at least one concave critical point in an off-axial region thereof. 
     The fifth lens element  650  with negative refractive power has an object-side surface  651  being concave in a paraxial region thereof and an image-side surface  652  being convex in a paraxial region thereof. The fifth lens element  650  is made of plastic material and has the object-side surface  651  and the image-side surface  652  being both aspheric. 
     The IR-cut filter  660  is made of glass material and located between the fifth lens element  650  and the image surface  670 , and will not affect the focal length of the photographing lens assembly. The image sensor  680  is disposed on or near the image surface  670  of the photographing lens assembly. 
     Both the object-side prism  691  and the image-side prism  692  are made of glass material. In  FIG. 11 , a configuration of the object-side prism  691  and the image-side prism  692  in the image capturing unit is for extending the optical axis. In  FIG. 11A  and  FIG. 11B , a configuration of the object-side prism  691  and the image-side prism  692  in the image capturing unit is for changing the direction of the optical axis. 
     The detailed optical data of the  6 th embodiment are shown in Table 11 and the aspheric surface data are shown in Table 12 below. 
     
       
         
           
               
             
               
                 TABLE 11 
               
             
            
               
                   
               
               
                 6th Embodiment 
               
               
                 f = 8.81 mm, Fno = 2.82, HFOV = 15.8 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Prism 
                 Plano 
                 4.600 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 2 
                   
                 Plano 
                 1.017 
               
               
                 3 
                 Ape. Stop 
                 Plano 
                 −0.517  
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 4 
                 Lens 1 
                 2.298 
                 (ASP) 
                 1.020 
                 Plastic 
                 1.545 
                 56.1 
                 5.55 
               
               
                 5 
                   
                 8.055 
                 (ASP) 
                 0.450 
               
               
                 6 
                 Lens 2 
                 −4.096 
                 (ASP) 
                 0.400 
                 Plastic 
                 1.639 
                 23.3 
                 −7.93 
               
               
                 7 
                   
                 −22.191 
                 (ASP) 
                 0.067 
               
               
                 8 
                 Lens 3 
                 1.646 
                 (ASP) 
                 0.473 
                 Plastic 
                 1.544 
                 56.0 
                 16.11 
               
               
                 9 
                   
                 1.822 
                 (ASP) 
                 0.316 
               
               
                 10 
                 Lens 4 
                 −3.742 
                 (ASP) 
                 0.518 
                 Plastic 
                 1.660 
                 20.4 
                 8.42 
               
               
                 11 
                   
                 −2.360 
                 (ASP) 
                 0.406 
               
               
                 12 
                 Lens 5 
                 −2.603 
                 (ASP) 
                 0.400 
                 Plastic 
                 1.639 
                 23.3 
                 −6.55 
               
               
                 13 
                   
                 −7.300 
                 (ASP) 
                 0.200 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 14 
                 Prism 
                 Plano 
                 4.600 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 15 
                   
                 Plano 
                 0.400 
               
               
                 16 
                 IR-cut filter 
                 Plano 
                 0.210 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 17 
                   
                 Plano 
                 0.581 
               
               
                 18 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
               
                 At least one of the object-side prism 691 and the image-side prism 692 has a reflective surface. 
               
               
                 An effective radius of an object-side surface of the object-side prism 691 (Surface 1) is 2.300 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 12 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Surface # 
                 4 
                 5 
                 6 
                 7 
                 8 
               
               
                   
               
               
                 k = 
                  0.0000E+00 
                  0.0000E+00 
                  0.0000E+00 
                  0.0000E+00 
                 0.0000E+00 
               
               
                 A4 = 
                 −5.2966E−03 
                 −2.1319E−02 
                  1.7553E−01 
                  1.9749E−01 
                 −1.1079E−01  
               
               
                 A6 = 
                 −1.5905E−03 
                  2.1096E−03 
                 −1.2360E−01 
                 −7.7241E−02 
                 3.3660E−02 
               
               
                 A8 = 
                  2.1775E−04 
                 −7.9169E−03 
                  5.0154E−02 
                 −1.3346E−02 
                 −6.7299E−02  
               
               
                 A10 = 
                 −6.6689E−04 
                  4.7100E−03 
                 −7.3018E−03 
                  4.0681 E−02 
                 4.6094E−02 
               
               
                 A12 = 
                  1.2767E−04 
                 −7.4930E−04 
                 −5.1729E−05 
                 −1.2358E−02 
                 −1.0239E−02  
               
               
                 A14 = 
                 — 
                 — 
                 — 
                 — 
                 2.7123E−04 
               
               
                   
               
               
                 Surface # 
                 9 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k = 
                 0.0000E+00 
                 0.0000E+00 
                 0.0000E+00 
                  0.0000E+00 
                  0.0000E+00 
               
               
                 A4 = 
                 −1.3521E−01  
                 1.0374E−01 
                 9.0939E−02 
                 −1.5524E−02 
                 −3.2493E−02 
               
               
                 A6 = 
                 8.3895E−02 
                 −2.3483E−02  
                 −3.6896E−02  
                 −4.6331E−02 
                 −4.6276E−03 
               
               
                 A8 = 
                 −9.0967E−02  
                 3.6751E−02 
                 3.6651E−02 
                  3.5008E−02 
                  8.2684E−03 
               
               
                 A10 = 
                 4.7582E−02 
                 −4.3945E−02  
                 −3.1727E−02  
                 −2.0768E−02 
                 −3.0145E−03 
               
               
                 A12 = 
                 −1.2512E−02  
                 2.5348E−02 
                 1.9533E−02 
                  1.0514E−02 
                  8.0577E−04 
               
               
                 A14 = 
                 2.2406E−03 
                 −4.9892E−03  
                 −4.0623E−03  
                 −1.6624E−03 
                 −1.0171E−04 
               
               
                   
               
            
           
         
       
     
     In the 6th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 6th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 11 and Table 12 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 6th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 8.81 
                 f/f2 
                 −1.11 
               
               
                 Fno 
                 2.82 
                 f3/f1 
                 2.90 
               
               
                 HFOV [deg.] 
                 15.8 
                 (f/f1) − (f/f2) + (f/f3) 
                 3.24 
               
               
                 (V2 + V3 + V4 + V5)/V1 
                 2.19 
                 BL/ImgH 
                 2.38 
               
               
                 CT1/CT2 
                 2.55 
                 BUTD 
                 1.48 
               
               
                 T34/T45 
                 0.78 
                 SD/TD 
                 0.87 
               
               
                 ΣAT/CT1 
                 1.21 
                 ImgH/f 
                 0.29 
               
               
                 ΣAT/ΣCT 
                 0.44 
                 EPD/ImgH 
                 1.24 
               
               
                 R1/R5 
                 1.40 
                 TL/f 
                 1.14 
               
               
                 R1/R7 
                 −0.61 
                 Y11/Y52 
                 1.03 
               
               
                 R5/f 
                 0.19 
                 Yc42/CT4 
                 2.28 
               
               
                 (R3 + R4)/(R3 − R4) 
                 −1.45 
                 — 
                 — 
               
               
                   
               
            
           
         
       
     
     7th Embodiment 
       FIG. 13  is a schematic view of an image capturing unit according to the 7th embodiment of the present disclosure.  FIG. 13A  is a schematic view of the image capturing unit with another configuration of prism according to the 7th embodiment to of the present disclosure.  FIG. 14  shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 7th embodiment. In  FIG. 13  and  FIG. 13A , the image capturing unit includes the photographing lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  780 . The photographing lens assembly includes, in order from an object side to an image side, an object-side prism  791 , an aperture stop  700 , a first lens element  710 , a second lens element  720 , a third lens element  730 , a fourth lens element  740 , a fifth lens element  750 , an IR-cut filter  760  and an image surface  770 . The photographing lens assembly includes five lens elements ( 710 - 750 ) with no additional lens element disposed between the first lens element  710  and the fifth lens element  750 . 
     The first lens element  710  with positive refractive power has an object-side surface  711  being convex in a paraxial region thereof and an image-side surface  712  being convex in a paraxial region thereof. The first lens element  710  is made of plastic material and has the object-side surface  711  and the image-side surface  712  being both aspheric. Both object-side surface  711  and the image-side surface  712  of the first lens element  710  have at least one inflection point. 
     The second lens element  720  with negative refractive power has an object-side surface  721  being concave in a paraxial region thereof and an image-side surface  722  being concave in a paraxial region thereof. The second lens element  720  is made of plastic material and has the object-side surface  721  and the image-side surface  722  being both aspheric. Both the object-side surface  721  and the image-side surface  722  of the second lens element  720  have at least one inflection point. 
     The third lens element  730  with positive refractive power has an object-side surface  731  being convex in a paraxial region thereof and an image-side surface  732  being concave in a paraxial region thereof. The third lens element  730  is made of plastic material and has the object-side surface  731  and the image-side surface  732  being both aspheric. The image-side surface  732  of the third lens element  730  has at least one inflection point. 
     The fourth lens element  740  with negative refractive power has an object-side surface  741  being concave in a paraxial region thereof and an image-side surface  742  being convex in a paraxial region thereof. The fourth lens element  740  is made of plastic material and has the object-side surface  741  and the image-side surface  742  being both aspheric. The image-side surface  742  of the fourth lens element  740  has at least one concave shape in an off-axial region thereof. The image-side surface  742  of the fourth lens element  740  has at least one concave critical point in an off-axial region thereof. 
     The fifth lens element  750  with negative refractive power has an object-side surface  751  being concave in a paraxial region thereof and an image-side surface  752  being convex in a paraxial region thereof. The fifth lens element  750  is made of plastic material and has the object-side surface  751  and the image-side surface  752  being both aspheric. 
     The IR-cut filter  760  is made of glass material and located between the fifth lens element  750  and the image surface  770 , and will not affect the focal length of the photographing lens assembly. The image sensor  780  is disposed on or near the image surface  770  of the photographing lens assembly. 
     The object-side prism  791  is made of glass material. In  FIG. 13 , a configuration of the object-side prism  791  in the image capturing unit is for extending the optical axis. In  FIG. 13A , a configuration of the object-side prism  791  in the image capturing unit is for changing the direction of the optical axis. 
     The detailed optical data of the 7th embodiment are shown in Table 13 and the aspheric surface data are shown in Table 14 below. 
     
       
         
           
               
             
               
                 TABLE 13 
               
             
            
               
                   
               
               
                 7th Embodiment 
               
               
                 f = 8.82 mm, Fno = 2.82, HFOV = 15.7 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Prism 
                 Plano 
                 4.300 
                 Glass 
                 1.883 
                 40.8 
                 — 
               
               
                 2 
                   
                 Plano 
                 1.060 
               
               
                 3 
                 Ape. Stop 
                 Plano 
                 −0.560  
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 4 
                 Lens 1 
                 2.134 
                 (ASP) 
                 1.079 
                 Plastic 
                 1.545 
                 56.1 
                 3.35 
               
               
                 5 
                   
                 −10.364 
                 (ASP) 
                 0.091 
               
               
                 6 
                 Lens 2 
                 −3.040 
                 (ASP) 
                 0.372 
                 Plastic 
                 1.639 
                 23.3 
                 −1.94 
               
               
                 7 
                   
                 2.186 
                 (ASP) 
                 0.116 
               
               
                 8 
                 Lens 3 
                 1.637 
                 (ASP) 
                 1.025 
                 Plastic 
                 1.660 
                 20.4 
                 2.81 
               
               
                 9 
                   
                 10.359 
                 (ASP) 
                 0.381 
               
               
                 10 
                 Lens 4 
                 −1.796 
                 (ASP) 
                 0.350 
                 Plastic 
                 1.639 
                 23.3 
                 −10.86 
               
               
                 11 
                   
                 −2.607 
                 (ASP) 
                 0.346 
               
               
                 12 
                 Lens 5 
                 −46.680 
                 (ASP) 
                 0.499 
                 Plastic 
                 1.544 
                 56.0 
                 −112.05 
               
               
                 13 
                   
                 −200.000 
                 (ASP) 
                 3.000 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 14 
                 IR-cut filter 
                 Plano 
                 0.210 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 15 
                   
                 Plano 
                 1.273 
               
               
                 16 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
               
                 The object-side prism 791 has a reflective surface. 
               
               
                 An effective radius of an object-side surface of the object-side prism 791 (Surface 1) is 2.150 mm. 
               
               
                 An effective radius of the image-side surface 752 (Surface 13) is 1.480 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 14 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Surface # 
                 4 
                 5 
                 6 
                 7 
                 8 
               
               
                   
               
               
                 k = 
                 −1.1539E−02 
                 4.0906E+00 
                 −1.6303E−01 
                 −2.0382E−01 
                 −1.4090E−01 
               
               
                 A4 = 
                 −6.2727E−03 
                 5.1584E−02 
                  2.0292E−01 
                 −2.7941E−02 
                 −1.8640E−01 
               
               
                 A6 = 
                 −2.2886E−03 
                 −2.5462E−02  
                 −1.5440E−01 
                  2.0421E−01 
                  2.5653E−01 
               
               
                 A8 = 
                 −4.5969E−04 
                 −4.3351E−03  
                  8.3841E−02 
                 −3.5376E−01 
                 −3.1616E−01 
               
               
                 A10 = 
                 −3.5255E−05 
                 5.7551E−03 
                 −3.1251E−02 
                  3.1018E−01 
                  2.2398E−01 
               
               
                 A12 = 
                 −9.1778E−05 
                 −1.6913E−03  
                  6.5926E−03 
                 −1.2965E−01 
                 −7.3636E−02 
               
               
                 A14 = 
                 — 
                 1.8589E−04 
                 −5.6079E−04 
                  1.9736E−02 
                  8.1864E−03 
               
               
                   
               
               
                 Surface # 
                 9 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k = 
                 1.6628E+00 
                 −1.1262E−01  
                 −5.2455E−01  
                 3.5282E+01 
                 −9.0000E+01 
               
               
                 A4 = 
                 −3.9517E−02  
                 1.5157E−01 
                 1.2044E−01 
                 −1.2267E−01  
                 −1.0037E−01 
               
               
                 A6 = 
                 2.6590E−02 
                 1.9259E−02 
                 5.1338E−02 
                 5.1687E−02 
                  3.1136E−02 
               
               
                 A8 = 
                 −6.4304E−02  
                 −1.4437E−01  
                 −1.0774E−01  
                 −4.6477E−02  
                 −1.4939E−02 
               
               
                 A10 = 
                 4.1599E−02 
                 1.4478E−01 
                 1.1552E−01 
                 4.0035E−02 
                  3.7773E−03 
               
               
                 A12 = 
                 4.7085E−03 
                 −5.6801E−02  
                 −6.2406E−02  
                 −2.1902E−02  
                 −4.6775E−04 
               
               
                 A14 = 
                 −5.7766E−03  
                 5.1333E−03 
                 1.3140E−02 
                 5.8309E−03 
                 −6.6419E−05 
               
               
                   
               
            
           
         
       
     
     In the 7th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 7th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 13 and Table 14 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 7th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 8.82 
                 f/f2 
                 −4.56 
               
               
                 Fno 
                 2.82 
                 f3/f1 
                 0.84 
               
               
                 HFOV [deg.] 
                 15.7 
                 (f/f1) − (f/f2) + (f/f3) 
                 10.33 
               
               
                 (V2 + V3 + V4 + V5)/V1 
                 2.19 
                 BL/ImgH 
                 1.78 
               
               
                 CT1/CT2 
                 2.90 
                 BL/TD 
                 1.05 
               
               
                 T34/T45 
                 1.10 
                 SD/TD 
                 0.87 
               
               
                 ΣAT/CT1 
                 0.87 
                 ImgH/f 
                 0.29 
               
               
                 ΣAT/ΣCT 
                 0.28 
                 EPD/ImgH 
                 1.24 
               
               
                 R1/R5 
                 1.30 
                 TL/f 
                 0.99 
               
               
                 R1/R7 
                 −1.19 
                 Y11/Y52 
                 1.06 
               
               
                 R5/f 
                 0.19 
                 Yc42/CT4 
                 2.49 
               
               
                 (R3 + R4)/(R3 − R4) 
                 0.16 
                 — 
                 — 
               
               
                   
               
            
           
         
       
     
     8th Embodiment 
       FIG. 15  is a schematic view of an image capturing unit according to the 8th embodiment of the present disclosure.  FIG. 16  shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 8th embodiment. In  FIG. 15 , the image capturing unit includes the photographing lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  880 . The photographing lens assembly includes, in order from an object side to an image side, an aperture stop  800 , a first lens element  810 , a second lens element  820 , a third lens element  830 , a fourth lens element  840 , a fifth lens element  850 , an IR-cut filter  860  and an image surface  870 . The photographing lens assembly includes five lens elements ( 810 - 850 ) with no additional lens element disposed between the first lens element  810  and the fifth lens element  850 . 
     The first lens element  810  with positive refractive power has an object-side surface  811  being convex in a paraxial region thereof and an image-side surface  812  being convex in a paraxial region thereof. The first lens element  810  is made of plastic material and has the object-side surface  811  and the image-side surface  812  being both aspheric. Both the object-side surface  811  and the image-side surface  812  of the first lens element  810  have at least one inflection point. 
     The second lens element  820  with negative refractive power has an object-side surface  821  being concave in a paraxial region thereof and an image-side surface  822  being concave in a paraxial region thereof. The second lens element  820  is made of plastic material and has the object-side surface  821  and the image-side surface  822  being both aspheric. Both the object-side surface  821  and the image-side surface  822  of the second lens element  820  have at least one inflection point. 
     The third lens element  830  with positive refractive power has an object-side surface  831  being convex in a paraxial region thereof and an image-side surface  832  being concave in a paraxial region thereof. The third lens element  830  is made of plastic material and has the object-side surface  831  and the image-side surface  832  being both aspheric. The image-side surface  832  of the third lens element  830  has at least one inflection point. 
     The fourth lens element  840  with negative refractive power has an object-side surface  841  being concave in a paraxial region thereof and an image-side surface  842  being convex in a paraxial region thereof. The fourth lens element  840  is made of plastic material and has the object-side surface  841  and the image-side surface  842  being both aspheric. The image-side surface  842  of the fourth lens element  840  has at least one concave critical point in an off-axial region thereof. 
     The fifth lens element  850  with negative refractive power has an object-side surface  851  being concave in a paraxial region thereof and an image-side surface  852  being convex in a paraxial region thereof. The fifth lens element  850  is made of plastic material and has the object-side surface  851  and the image-side surface  852  being both aspheric. The object-side surface  851  of the fifth lens element  850  has at least one inflection point. 
     The IR-cut filter  860  is made of glass material and located between the fifth lens element  850  and the image surface  870 , and will not affect the focal length of the photographing lens assembly. The image sensor  880  is disposed on or near the image surface  870  of the photographing lens assembly. 
     The detailed optical data of the 8th embodiment are shown in Table 15 and the aspheric surface data are shown in Table 16 below. 
     
       
         
           
               
             
               
                 TABLE 15 
               
             
            
               
                   
               
               
                 8th Embodiment 
               
               
                 f = 8.83 mm, Fno = 2.82, HFOV = 15.7 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal Length 
               
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.555  
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 2.136 
                 (ASP) 
                 1.075 
                 Plastic 
                 1.545 
                 56.1 
                 3.38 
               
               
                 3 
                   
                 −10.895 
                 (ASP) 
                 0.084 
               
               
                 4 
                 Lens 2 
                 −3.033 
                 (ASP) 
                 0.355 
                 Plastic 
                 1.639 
                 23.3 
                 −1.97 
               
               
                 5 
                   
                 2.255 
                 (ASP) 
                 0.111 
               
               
                 6 
                 Lens 3 
                 1.617 
                 (ASP) 
                 0.898 
                 Plastic 
                 1.660 
                 20.4 
                 2.89 
               
               
                 7 
                   
                 8.356 
                 (ASP) 
                 0.379 
               
               
                 8 
                 Lens 4 
                 −1.817 
                 (ASP) 
                 0.350 
                 Plastic 
                 1.639 
                 23.3 
                 −13.23 
               
               
                 9 
                   
                 −2.488 
                 (ASP) 
                 0.344 
               
               
                 10 
                 Lens 5 
                 −28.665 
                 (ASP) 
                 0.514 
                 Plastic 
                 1.544 
                 56.0 
                 −61.57 
               
               
                 11 
                   
                 −200.000 
                 (ASP) 
                 3.000 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 12 
                 IR-cut filter 
                 Plano 
                 0.210 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 13 
                   
                 Plano 
                 1.432 
               
               
                 14 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
               
                 An effective radius of the image-side surface 852 (Surface 11) is 1.480 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 16 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 k = 
                 −2.0528E−02 
                 1.0434E+01 
                 −2.3480E−01  
                 −2.9718E−01 
                 −1.8572E−01 
               
               
                 A4 = 
                 −8.7993E−03 
                 1.5432E−02 
                 1.9414E−01 
                 −2.9079E−03 
                 −1.9104E−01 
               
               
                 A6 = 
                 −4.6072E−05 
                 6.2667E−02 
                 −1.1315E−01  
                  1.7896E−01 
                  2.7912E−01 
               
               
                 A8 = 
                 −1.3934E−03 
                 −9.3342E−02  
                 2.9973E−02 
                 −3.7379E−01 
                 −3.6288E−01 
               
               
                 A10 = 
                  2.5550E−04 
                 5.1031E−02 
                 3.0548E−04 
                  3.4535E−01 
                  2.6191E−01 
               
               
                 A12 = 
                 −1.5166E−04 
                 −1.3238E−02  
                 −2.2009E−03  
                 −1.4606E−01 
                 −8.7966E−02 
               
               
                 A14 = 
                   
                 1.3631E−03 
                 3.9534E−04 
                  2.2411E−02 
                  1.0371E−02 
               
               
                   
               
               
                 Surface # 
                 7 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                  8.7135E+00 
                 −2.1694E−01 
                 −5.7329E−01 
                 2.2602E+01 
                 −9.0000E+01 
               
               
                 A4 = 
                 −5.7164E−02 
                  1.1527E−01 
                  1.0059E−01 
                 −1.1476E−01  
                 −9.2745E−02 
               
               
                 A6 = 
                  6.6398E−02 
                  1.4243E−01 
                  1.1973E−01 
                 5.2411E−02 
                  2.5361E−02 
               
               
                 A8 = 
                 −5.5562E−02 
                 −2.4169E−01 
                 −1.5515E−01 
                 −4.7973E−02  
                 −9.2753E−03 
               
               
                 A10 = 
                 −1.8819E−02 
                  1.2417E−01 
                  7.0816E−02 
                 2.1339E−02 
                 −2.6999E−03 
               
               
                 A12 = 
                  4.7549E−02 
                 −4.0644E−03 
                 −2.1504E−03 
                 −6.1352E−03  
                  3.1453E−03 
               
               
                 A14 = 
                 −1.5576E−02 
                 −1.1066E−02 
                 −3.7241E−03 
                 2.4853E−03 
                 −7.7407E−04 
               
               
                   
               
            
           
         
       
     
     In the 8th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 8th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 15 and Table 16 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 8th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 8.83 
                 f/f2 
                 −4.47 
               
               
                 Fno 
                 2.82 
                 f3/f1 
                 0.85 
               
               
                 HFOV [deg.] 
                 15.7 
                 (f/f1) − (f/f2) + (f/f3) 
                 10.15 
               
               
                 (V2 + V3 + V4 + V5)/V1 
                 2.19 
                 BL/ImgH 
                 1.84 
               
               
                 CT1/CT2 
                 3.03 
                 BL/TD 
                 1.13 
               
               
                 T34/T45 
                 1.10 
                 SD/TD 
                 0.86 
               
               
                 ΣAT/CT1 
                 0.85 
                 ImgH/f 
                 0.29 
               
               
                 ΣAT/ΣCT 
                 0.29 
                 EPD/ImgH 
                 1.24 
               
               
                 R1/R5 
                 1.32 
                 TL/f 
                 0.99 
               
               
                 R1/R7 
                 −1.18 
                 Y11/Y52 
                 1.06 
               
               
                 R5/f 
                 0.18 
                 Yc42/CT4 
                 2.56 
               
               
                 (R3 + R4)/(R3 − R4) 
                 0.15 
                 — 
                 — 
               
               
                   
               
            
           
         
       
     
     9th Embodiment 
       FIG. 17  is a schematic view of an image capturing unit according to the 9th embodiment of the present disclosure.  FIG. 18  shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 9th embodiment. In  FIG. 17 , the image capturing unit includes the photographing lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  980 . The photographing lens assembly includes, in order from an object side to an image side, an aperture stop  900 , a first lens element  910 , a second lens element  920 , a third lens element  930 , a fourth lens element  940 , a fifth lens element  950 , an IR-cut filter  960  and an image surface  970 . The photographing lens assembly includes five lens elements ( 910 - 950 ) with no additional lens element disposed between the first lens element  910  and the fifth lens element  950 . 
     The first lens element  910  with positive refractive power has an object-side surface  911  being convex in a paraxial region thereof and an image-side surface  912  being convex in a paraxial region thereof. The first lens element  910  is made of plastic material and has the object-side surface  911  and the image-side surface  912  being both aspheric. The image-side surface  912  of the first lens element  910  has at least one inflection point. 
     The second lens element  920  with negative refractive power has an object-side surface  921  being concave in a paraxial region thereof and an image-side surface  922  being concave in a paraxial region thereof. The second lens element  920  is made of plastic material and has the object-side surface  921  and the image-side surface  922  being both aspheric. The object-side surface  921  of the second lens element  920  has at least one inflection point. 
     The third lens element  930  with positive refractive power has an object-side surface  931  being convex in a paraxial region thereof and an image-side surface  932  being concave in a paraxial region thereof. The third lens element  930  is made of plastic material and has the object-side surface  931  and the image-side surface  932  being both aspheric. The image-side surface  932  of the third lens element  930  has at least one inflection point. 
     The fourth lens element  940  with negative refractive power has an object-side surface  941  being concave in a paraxial region thereof and an image-side surface  942  being convex in a paraxial region thereof. The fourth lens element  940  is made of plastic material and has the object-side surface  941  and the image-side surface  942  being both aspheric. The object-side surface  941  of the fourth lens element  940  has at least one inflection point. The image-side surface  942  of the fourth lens element  940  has at least one concave shape in an off-axial region thereof. The image-side surface  942  of the fourth lens element  940  has at least one concave critical point in an off-axial region thereof. 
     The fifth lens element  950  with positive refractive power has an object-side surface  951  being convex in a paraxial region thereof and an image-side surface  952  being concave in a paraxial region thereof. The fifth lens element  950  is made of plastic material and has the object-side surface  951  and the image-side surface  952  being both aspheric. The object-side surface  951  of the fifth lens element  950  has at least one concave shape in an off-axial region thereof. The image-side surface  952  of the fifth lens element  950  has at least one convex shape in an off-axial region thereof. 
     The IR-cut filter  960  is made of glass material and located between the fifth lens element  950  and the image surface  970 , and will not affect the focal length of the photographing lens assembly. The image sensor  980  is disposed on or near the image surface  970  of the photographing lens assembly. 
     The detailed optical data of the 9th embodiment are shown in Table 17 and the aspheric surface data are shown in Table 18 below. 
     
       
         
           
               
             
               
                 TABLE 17 
               
             
            
               
                   
               
               
                 9th Embodiment 
               
               
                 f = 8.60 mm, Fno = 2.80, HFOV = 16.1 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal Length 
               
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.588  
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 2.173 
                 (ASP) 
                 0.927 
                 Plastic 
                 1.545 
                 56.1 
                 3.62 
               
               
                 3 
                   
                 −18.361 
                 (ASP) 
                 0.200 
               
               
                 4 
                 Lens 2 
                 −3.388 
                 (ASP) 
                 0.350 
                 Plastic 
                 1.639 
                 23.3 
                 −2.14 
               
               
                 5 
                   
                 2.378 
                 (ASP) 
                 0.163 
               
               
                 6 
                 Lens 3 
                 1.853 
                 (ASP) 
                 0.795 
                 Plastic 
                 1.660 
                 20.4 
                 2.92 
               
               
                 7 
                   
                 40.696 
                 (ASP) 
                 0.243 
               
               
                 8 
                 Lens 4 
                 −1.831 
                 (ASP) 
                 0.389 
                 Plastic 
                 1.660 
                 20.4 
                 −8.21 
               
               
                 9 
                   
                 −2.999 
                 (ASP) 
                 0.247 
               
               
                 10 
                 Lens 5 
                 3.355 
                 (ASP) 
                 0.450 
                 Plastic 
                 1.544 
                 56.0 
                 50.15 
               
               
                 11 
                   
                 3.645 
                 (ASP) 
                 4.300 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 12 
                 IR-cut filter 
                 Plano 
                 0.210 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 13 
                   
                 Plano 
                 0.460 
               
               
                 14 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
               
                 An effective radius of the image-side surface 952 (Surface 11) is 1.480 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 18 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 k = 
                  1.1391E−01 
                 −9.0000E+01  
                 5.4254E−01 
                 −6.9401E−01  
                 −1.9563E−01 
               
               
                 A4 = 
                 −9.2218E−03 
                 3.3812E−02 
                 2.1019E−01 
                 7.8241E−02 
                 −1.1439E−01 
               
               
                 A6 = 
                  7.3160E−03 
                 5.4551E−02 
                 −1.5229E−01  
                 −8.8424E−02  
                  4.3733E−02 
               
               
                 A8 = 
                 −6.3045E−03 
                 −1.0866E−01  
                 3.6706E−02 
                 2.5318E−02 
                 −7.6450E−04 
               
               
                 A10 = 
                  2.2396E−03 
                 7.5085E−02 
                 1.8877E−02 
                 1.1983E−02 
                 −3.3624E−02 
               
               
                 A12 = 
                 −3.8429E−04 
                 −2.4110E−02  
                 −1.3318E−02  
                 −5.8691E−03  
                  2.7842E−02 
               
               
                 A14 = 
                 — 
                 2.9944E−03 
                 2.2539E−03 
                 9.7001E−05 
                 −6.3927E−03 
               
               
                   
               
               
                 Surface # 
                 7 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                  8.6918E+01 
                 −6.3684E−01 
                 2.5779E−01 
                 −3.4170E+01 
                 −4.9565E+01 
               
               
                 A4 = 
                 −6.1835E−02 
                  1.7764E−01 
                 1.2385E−01 
                 −8.9311E−02 
                 −4.3846E−02 
               
               
                 A6 = 
                 −2.1966E−02 
                 −6.2465E−02 
                 6.8054E−02 
                  1.2593E−02 
                 −5.7253E−02 
               
               
                 A8 = 
                  1.2908E−01 
                  6.9917E−02 
                 −1.3705E−01  
                 −4.3051E−02 
                  6.8887E−02 
               
               
                 A10 = 
                 −1.5821E−01 
                 −1.0146E−01 
                 1.0545E−01 
                  5.5447E−02 
                 −4.3583E−02 
               
               
                 A12 = 
                  8.4547E−02 
                  6.3968E−02 
                 −4.3710E−02  
                 −3.3319E−02 
                  1.4165E−02 
               
               
                 A14 = 
                 −1.6403E−02 
                 −1.4556E−02 
                 8.1961E−03 
                  7.5188E−03 
                 −1.9437E−03 
               
               
                   
               
            
           
         
       
     
     In the 9th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 9th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 17 and Table 18 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 9th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 8.60 
                 f/f2 
                 −4.02 
               
               
                 Fno 
                 2.80 
                 f3/f1 
                 0.81 
               
               
                 HFOV [deg.] 
                 16.1 
                 (f/f1) − (f/f2) + (f/f3) 
                 9.35 
               
               
                 (V2 + V3 + V4 + V5)/V1 
                 2.14 
                 BL/ImgH 
                 1.97 
               
               
                 CT1/CT2 
                 2.65 
                 BL/TD 
                 1.32 
               
               
                 T34/T45 
                 0.98 
                 SD/TD 
                 0.84 
               
               
                 ΣAT/CT1 
                 0.92 
                 ImgH/f 
                 0.29 
               
               
                 ΣAT/ΣCT 
                 0.29 
                 EPD/ImgH 
                 1.22 
               
               
                 R1/R5 
                 1.17 
                 TL/f 
                 1.02 
               
               
                 R1/R7 
                 −1.19 
                 Y11/Y52 
                 1.04 
               
               
                 R5/f 
                 0.22 
                 Yc42/CT4 
                 2.16 
               
               
                 (R3 + R4)/(R3 − R4) 
                 0.18 
                 — 
                 — 
               
               
                   
               
            
           
         
       
     
     10th Embodiment 
       FIG. 19  is a schematic view of an image capturing unit according to the 10th embodiment of the present disclosure.  FIG. 20  shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 10th embodiment. In  FIG. 19 , the image capturing unit includes the photographing lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  1080 . The photographing lens assembly includes, in order from an object side to an image side, an aperture stop  1000 , a first lens element  1010 , a second lens element  1020 , a third lens element  1030 , a fourth lens element  1040 , a fifth lens element  1050 , an IR-cut filter  1060  and an image surface  1070 . The photographing lens assembly includes five lens elements ( 1010 - 1050 ) with no additional lens element disposed between the first lens element  1010  and the fifth lens element  1050 . 
     The first lens element  1010  with positive refractive power has an object-side surface  1011  being convex in a paraxial region thereof and an image-side surface  1012  being concave in a paraxial region thereof. The first lens element  1010  is made of plastic material and has the object-side surface  1011  and the image-side surface  1012  being both aspheric. The image-side surface  1012  of the first lens element  1010  has at least one inflection point. 
     The second lens element  1020  with negative refractive power has an object-side surface  1021  being concave in a paraxial region thereof and an image-side surface  1022  being convex in a paraxial region thereof. The second lens element  1020  is made of plastic material and has the object-side surface  1021  and the image-side surface  1022  being both aspheric. The object-side surface  1021  of the second lens element  1020  has at least one inflection point. 
     The third lens element  1030  with positive refractive power has an object-side surface  1031  being convex in a paraxial region thereof and an image-side surface  1032  being concave in a paraxial region thereof. The third lens element  1030  is made of plastic material and has the object-side surface  1031  and the image-side surface  1032  being both aspheric. The image-side surface  1032  of the third lens element  1030  has at least one inflection point. 
     The fourth lens element  1040  with positive refractive power has an object-side surface  1041  being concave in a paraxial region thereof and an image-side surface  1042  being convex in a paraxial region thereof. The fourth lens element  1040  is made of plastic material and has the object-side surface  1041  and the image-side surface  1042  being both aspheric. The object-side surface  1041  of the fourth lens element  1040  has at least one inflection point. The image-side surface  1042  of the fourth lens element  1040  has at least one concave shape in an off-axial region thereof. 
     The fifth lens element  1050  with negative refractive power has an object-side surface  1051  being concave in a paraxial region thereof and an image-side surface  1052  being concave in a paraxial region thereof. The fifth lens element  1050  is made of plastic material and has the object-side surface  1051  and the image-side surface  1052  being both aspheric. Both the object-side surface  1051  and the image-side surface  1052  of the fifth lens element  1050  have at least one inflection point. The image-side surface  1052  of the fifth lens element  1050  has at least one convex shape in an off-axial region thereof. 
     The IR-cut filter  1060  is made of glass material and located between the fifth lens element  1050  and the image surface  1070 , and will not affect the focal length of the photographing lens assembly. The image sensor  1080  is disposed on or near the image surface  1070  of the photographing lens assembly. 
     The detailed optical data of the 10th embodiment are shown in Table 19 and the aspheric surface data are shown in Table 20 below. 
     
       
         
           
               
             
               
                 TABLE 19 
               
             
            
               
                   
               
               
                 10th Embodiment 
               
               
                 f = 10.01 mm, Fno = 2.80, HFOV = 14.5 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal Length 
               
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.815  
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 2.405 
                 (ASP) 
                 1.903 
                 Plastic 
                 1.544 
                 55.9 
                 4.55 
               
               
                 3 
                   
                 63.407 
                 (ASP) 
                 0.392 
               
               
                 4 
                 Lens 2 
                 −2.187 
                 (ASP) 
                 0.450 
                 Plastic 
                 1.660 
                 20.4 
                 −5.34 
               
               
                 5 
                   
                 −6.232 
                 (ASP) 
                 0.167 
               
               
                 6 
                 Lens 3 
                 8.814 
                 (ASP) 
                 0.524 
                 Plastic 
                 1.660 
                 20.4 
                 89.43 
               
               
                 7 
                   
                 10.117 
                 (ASP) 
                 0.296 
               
               
                 8 
                 Lens 4 
                 −3.943 
                 (ASP) 
                 0.625 
                 Plastic 
                 1.660 
                 20.4 
                 17.25 
               
               
                 9 
                   
                 −3.113 
                 (ASP) 
                 0.385 
               
               
                 10 
                 Lens 5 
                 −24.800 
                 (ASP) 
                 0.402 
                 Plastic 
                 1.544 
                 55.9 
                 −17.46 
               
               
                 11 
                   
                 15.467 
                 (ASP) 
                 0.500 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 12 
                 IR-cut filter 
                 Plano 
                 0.210 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 13 
                   
                 Plano 
                 3.903 
               
               
                 14 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 20 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 k = 
                  3.2931E−01 
                 −9.9000E+01 
                 −1.5280E+01 
                 −4.5131E+01 
                 3.1079E+01 
               
               
                 A4 = 
                 −3.3078E−03 
                  2.8751E−02 
                  1.1172E−01 
                  3.2805E−01 
                 6.8893E−02 
               
               
                 A6 = 
                  3.9220E−04 
                 −7.0779E−03 
                 −1.1320E−01 
                 −3.8787E−01 
                 −1.8128E−01  
               
               
                 A8 = 
                 −5.7668E−04 
                 −2.5533E−03 
                  5.0277E−02 
                  2.7257E−01 
                 1.4620E−01 
               
               
                 A10 = 
                  1.6076E−04 
                  1.9400E−03 
                 −8.2251E−03 
                 −1.3186E−01 
                 −7.7637E−02  
               
               
                 A12 = 
                 −2.6087E−05 
                 −4.5204E−05 
                 −1.0095E−04 
                  4.8364E−02 
                 3.2177E−02 
               
               
                 A14 = 
                 — 
                 — 
                 — 
                 −8.6999E−03 
                 −5.9694E−03  
               
               
                   
               
               
                 Surface # 
                 7 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                  1.7379E+01 
                 −7.7210E+00 
                 −2.7995E+00 
                  8.9439E+01 
                 7.5141E+01 
               
               
                 A4 = 
                 −3.0538E−02 
                  6.3352E−02 
                  3.9864E−02 
                 −1.0075E−01 
                 −1.0859E−01  
               
               
                 A6 = 
                 −2.7964E−02 
                 −1.1809E−01 
                 −8.7797E−02 
                 −5.0250E−02 
                 2.1072E−02 
               
               
                 A8 = 
                  6.4881E−02 
                  2.0898E−01 
                  1.4042E−01 
                  1.1484E−01 
                 8.5198E−03 
               
               
                 A10 = 
                 −4.2528E−02 
                 −1.7572E−01 
                 −1.0773E−01 
                 −9.0116E−02 
                 −1.1484E−02  
               
               
                 A12 = 
                  1.0035E−02 
                  6.8465E−02 
                  3.8697E−02 
                  3.0823E−02 
                 4.0352E−03 
               
               
                 A14 = 
                 — 
                 −1.0228E−02 
                 −5.2074E−03 
                 −3.7347E−03 
                 −4.9313E−04  
               
               
                   
               
            
           
         
       
     
     In the 10th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 10th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 19 and Table 20 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 10th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 10.01 
                 f/f2 
                 −1.87 
               
               
                 Fno 
                 2.80 
                 f3/f1 
                 19.67 
               
               
                 HFOV [deg.] 
                 14.5 
                 (f/f1) − (f/f2) + (f/f3) 
                 4.19 
               
               
                 (V2 + V3 + V4 + V5)/V1 
                 2.09 
                 BL/ImgH 
                 1.76 
               
               
                 CT1/CT2 
                 4.23 
                 BL/TD 
                 0.90 
               
               
                 T34/T45 
                 0.77 
                 SD/TD 
                 0.84 
               
               
                 ΣAT/CT1 
                 0.65 
                 ImgH/f 
                 0.26 
               
               
                 ΣAT/ΣCT 
                 0.32 
                 EPD/ImgH 
                 1.37 
               
               
                 R1/R5 
                 0.27 
                 TL/f 
                 0.97 
               
               
                 R1/R7 
                 −0.61 
                 Y11/Y52 
                 1.03 
               
               
                 R5/f 
                 0.88 
                 Yc42/CT4 
                 — 
               
               
                 (R3 + R4)/(R3 − R4) 
                 −2.08 
                 — 
                 — 
               
               
                   
               
            
           
         
       
     
     11th Embodiment 
       FIG. 22  is a perspective view of an image capturing unit according to the 11th embodiment of the present disclosure. In this embodiment, an image capturing unit  10  is a camera module including a lens unit  11 , a driving device  12 , an image sensor  13  and a cable  14 . The lens unit  11  includes the photographing lens assembly disclosed in the first embodiment, a barrel and a holder member (their reference numerals are omitted) for holding the photographing lens assembly. The external light converges into the lens unit  11  of the image capturing unit  10  to generate an image, and the lens unit  11  along with the driving device  12  is utilized for image focusing on the image sensor  13 . Then, the image is digitally transmitted to an electronic component by the cable  14 . 
     The driving device  12  can have auto focusing functionality, and different driving configurations can be through the use of voice coil motors (VCM), micro electro-mechanical systems (MEMS), piezoelectric systems, or shape memory alloy materials. The driving device  12  is favorable for the lens unit  11  to obtain a better imaging position, so that a clear image of the imaged object can be captured by the lens unit  11  with different object distances. The image sensor  13  (for example, CCD or CMOS) can be featured with high photosensitivity and low noise, disposed on the image surface of the photographing lens assembly to provide higher image quality. 
     There can be a dynamic sensing element  26 , such as an accelerometer, a gyroscope and a hall effect sensor, configured to work with the driving device  12  (Please refer to  FIG. 23 ), so that the driving device  12  can provide optical image stabilization (OIS). The driving device  12  working with the dynamic sensing element  26  is favorable for compensating for pan and tilt of the lens unit  11  to reduce blurring associated with motion during exposure. In some cases, the driving device  12  can be can be assisted by electronic image stabilization (EIS) with image processing software, thereby improving image quality while in motion or low-light condition. 
     12th Embodiment 
       FIG. 23  is a schematic view of an electronic device according to the 12th embodiment of the present disclosure.  FIG. 24  is a perspective view of the electronic device in  FIG. 23 .  FIG. 25  is another perspective view of the electronic device in  FIG. 23 . In this embodiment, an electronic device  20  is a smart phone including the image capturing unit  10  disclosed in the eleventh embodiment, a flash light module  21 , a focus assist module  22 , an image signal processor  23 , an user interface  24 , an image software processor  25  and a dynamic sensing element  26 . 
     When a user interacts with the user interface  24  to capture images, light converges into the image capturing unit  10  to generate image, and the flash light module  21  is activated for light supplement. The focus assist module  22  detects the object distance of the imaged object to achieve fast image auto focus. The image signal processor  23  is configured to optimize the captured image to improve image quality. The light beam emitted from focus assist module  22  can be either infrared light or laser. The user interface  24  can be a touch screen or a shutter button. The user is able to interact with the user interface  24  and the image software processor  25  having multiple functions to capture images and complete image processing. 
     The smart phone in this embodiment is only exemplary for showing the image capturing unit  10  of the present disclosure installed in an electronic device, and the present disclosure is not limited thereto. The image capturing unit  10  can be optionally applied to optical systems with a movable focus. Furthermore, the photographing lens assembly of the image capturing unit  10  is featured with good capability in aberration corrections and high image quality, and can be applied to 3D (three-dimensional) image capturing applications, in products such as digital cameras, mobile devices, digital tablets, wearable devices, smart televisions, multiple lens devices, network surveillance devices, motion sensing input devices, dashboard cameras, vehicle backup cameras and other electronic imaging devices. 
     The foregoing description, for the purpose of explanation, has been described with reference to specific embodiments. It is to be noted that TABLES 1-20 show different data of the different embodiments; however, the data of the different embodiments are obtained from experiments. The embodiments were chosen and described in order to best explain the principles of the disclosure and its practical applications, to thereby enable others skilled in the art to best utilize the disclosure and various embodiments with various modifications as are suited to the particular use contemplated. The embodiments depicted above and the appended drawings are exemplary and are not intended to be exhaustive or to limit the scope of the present disclosure to the precise forms disclosed. Many modifications and variations are possible in view of the above teachings.