Patent Publication Number: US-11640102-B2

Title: Camera module and electronic device

Description:
RELATED APPLICATIONS 
     The present application is a continuation of U.S. application Ser. No. 16/795,680, filed Feb. 20, 2020, which claims priority to Provisional Application Ser. No. 62/811,062, filed Feb. 27, 2019, which is herein incorporated by reference. 
    
    
     BACKGROUND 
     Technical Field 
     The present disclosure relates to a camera module. More particularly, the present disclosure relates to a camera module applicable to portable electronic devices. 
     Description of Related Art 
     A common camera module generally has a protective glass disposed between an imaging lens assembly and an object. Since between the protective glass and the imaging lens assembly has an air distance, when the strong light of the object causes a stray light, the influence of the stray light can be mitigated by the means for reducing reflection disposed in the imaging lens assembly. 
     However, when the camera module is disposed in a common electronic device with camera functions, a display screen made of light-transmitting material is disposed between the imaging lens assembly and the object, and the display screen has a backlight board whose luminous location is closer to the imaging lens assembly than the strong light of the object thereto. Therefore, the influence of the stray light cannot be mitigated by the means for reducing reflection disposed in the imaging lens assembly, and the quality of the image is also easier to affect. 
     Therefore, developing a camera module which can effectively eliminate the stray light, has good imaging quality, and is miniaturized in the electronic device has become an important and urgent problem to be solved in the industry. 
     SUMMARY 
     According to one aspect of the present disclosure, a camera module includes an imaging lens assembly and an image sensor, wherein the image sensor is located on an image side of the imaging lens assembly. The imaging lens assembly has an optical axis and includes a plastic lens barrel and a plurality of plastic lens elements, wherein the plurality of plastic lens elements are disposed in the plastic lens barrel. The plastic lens barrel includes an object-side outer surface, a lens barrel minimum opening, an object-side outer inclined surface and a reversing inclined surface. The object-side outer surface is a surface of the plastic lens barrel facing towards an object side being closest to the object side and is annular. The object-side outer inclined surface is shrunk from the object-side outer surface toward the lens barrel minimum opening. The reversing inclined surface expands from the lens barrel minimum opening to the image side, wherein a connecting position of the reversing inclined surface and the object-side outer inclined surface forms the lens barrel minimum opening. When a number of the plurality of plastic lens elements is N, a maximum outer diameter of the object-side outer surface is ψD, a distance between the lens barrel minimum opening and the object-side outer surface in a direction parallel to the optical axis is h, a chief ray angle between a chief ray corresponding to 1.0F image height of the imaging lens assembly and the image sensor is CRA 1.0F, and the following conditions can be satisfied: 4≤N≤10, 0.8 mm&lt;ψD≤3.4 mm, 0.01 mm&lt;h&lt;0.15 mm and CRA 1.0F&gt;25.0 degrees. 
     According to another aspect of the present disclosure, an electronic device includes the camera module according to the aforementioned aspect and a surface plate. The surface plate is disposed on the object side of the camera module. When a distance between a distance between the object-side outer surface and the surface plate in the direction parallel to the optical axis is g, the following condition can be satisfied: 0.03 mm&lt;g&lt;0.3 mm. 
     According to another aspect of the present disclosure, a camera module includes an imaging lens assembly and an image sensor. The image sensor is located at an image side of the imaging lens assembly. The imaging lens assembly has an optical axis and includes a plastic lens barrel, a plurality of plastic lens elements and a light blocking sheet. The plurality of plastic lens elements are disposed in the plastic lens barrel. The plastic lens barrel includes an object-side outer surface, a lens barrel minimum opening and a reversing inclined surface. The object-side outer surface is a surface of the plastic lens barrel facing towards an object side being closest to the object side and is annular. The lens barrel minimum opening is surrounded by the object-side outer surface. The reversing inclined surface is expanded from the lens barrel minimum opening to the image side. The light blocking sheet is disposed in the plastic lens barrel and is located between the lens barrel minimum opening and an object-side peripheral portion of one of the plurality of plastic lens elements being closest to the object side. When a number of the plurality of plastic lens elements is N, a maximum outer diameter of the object-side outer surface is ψD, a chief ray angle between a chief ray corresponding to 1.0F image height of the imaging lens assembly and the image sensor is CRA 1.0F, the following conditions can be satisfied: 4≤N≤10, 0.8 mm&lt;ψD≤3.4 mm and CRA 1.0F&gt;25.0 degrees. 
     According to another aspect of the present disclosure, an electronic device includes the camera module according to the aforementioned aspect and a surface plate. The surface plate is disposed on the object side of the camera module. The surface plate is a plate having a display function module. 
     According to another aspect of the present disclosure, an electronic device includes a camera module and a surface plate. The surface plate is a plate having a display function module. The camera module includes an imaging lens assembly and an image sensor wherein the image sensor is located at an image side of the imaging lens assembly, the surface plate is located at an object side of the imaging lens assembly. The imaging lens assembly has an optical axis and includes a plastic lens barrel and a plurality of plastic lens elements, wherein the plurality of plastic lens elements are disposed in the plastic lens barrel. The plastic lens barrel includes an object-side outer surface, a lens barrel minimum opening and a reversing inclined surface. The object-side outer surface is a surface of the plastic lens barrel facing towards an object side and closest to the object side and is annular. The lens barrel minimum opening is surrounded by the object-side outer surface. The reversing inclined surface is expanded from the lens barrel minimum opening to the image side. When a number of the plurality of plastic lens elements is N, a maximum outer diameter of the object-side outer surface is ψD, a chief ray angle between a chief ray corresponding to 1.0F image height of the imaging lens assembly and the image sensor is CRA 1.0F, the following conditions can be satisfied: 4≤N≤10, 0.8 mm&lt;ψD≤3.4 mm and CRA 1.0F&gt;25.0 degrees. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present disclosure can be more fully understood by reading the following detailed description of the embodiment, with reference made to the accompanying drawings as follows: 
         FIG.  1 A  is a schematic view of an electronic device according to the 1st embodiment of the present disclosure. 
         FIG.  1 B  is a schematic view of a surface plate according to the 1st embodiment of  FIG.  1 A . 
         FIG.  10    is a schematic view of the surface plate and the camera module according to the 1st embodiment of  FIG.  1 A . 
         FIG.  1 D  is another schematic view of the surface plate and the camera module according to the 1st embodiment of  FIG.  1 A . 
         FIG.  1 E  is a schematic view of a plastic lens barrel according to the 1st embodiment of  FIG.  1 A . 
         FIG.  1 F  is a three-dimensional schematic view of the plastic lens barrel according to the 1st embodiment of  FIG.  1 A . 
         FIG.  1 G  is a schematic view of parameters h and d according to the 1st embodiment of  FIG.  1 A . 
         FIG.  1 H  is a schematic view of a parameter θ according to the 1st embodiment of  FIG.  1 A . 
         FIG.  1 I  is a schematic view of parameters ψD, ψED and ψs1 according to the 1st embodiment of  FIG.  1 A . 
         FIG.  2 A  is a schematic view of a surface plate and a camera module of an electronic device according to the 2nd embodiment of the present disclosure. 
         FIG.  2 B  is another schematic view of the surface plate and the camera module according to the 2nd embodiment of  FIG.  2 A . 
         FIG.  2 C  is another schematic view of the surface plate and the camera module according to the 2nd embodiment of  FIG.  2 A . 
         FIG.  2 D  is a schematic view of parameters h and d according to the 2nd embodiment of  FIG.  2 A . 
         FIG.  2 E  is a schematic view of a parameter θ according to the 2nd embodiment of  FIG.  2 A . 
         FIG.  2 F  is a schematic view of parameters ψD, ψED and ψs1 according to the 2nd embodiment of  FIG.  2 A . 
         FIG.  3 A  is a schematic view of a surface plate and a camera module of an electronic device according to the 3rd embodiment of the present disclosure. 
         FIG.  3 B  is a schematic view of parameters h and d according to the 3rd embodiment of  FIG.  3 A . 
         FIG.  3 C  is a schematic view of a parameter θ according to the 3rd embodiment of  FIG.  3 A . 
         FIG.  3 D  is a schematic view of parameters ψD, ψED and ψs1 according to the 3rd embodiment of  FIG.  3 A . 
         FIG.  4 A  is a schematic view of a surface plate and a camera module of an electronic device according to the 4th embodiment of the present disclosure. 
         FIG.  4 B  is an exploded view of an imaging lens assembly according to the 4th embodiment of  FIG.  4 A . 
         FIG.  4 C  is a three-dimensional schematic view of a plastic lens barrel according to the 4th embodiment of  FIG.  4 A . 
         FIG.  4 D  is a schematic view of parameters ψD, ψED and d according to the 4th embodiment of  FIG.  4 A . 
         FIG.  4 E  is a schematic view of a parameter θ according to the 4th embodiment of  FIG.  4 A . 
         FIG.  4 F  is a schematic view of parameters h and ψs1 according to the 4th embodiment of  FIG.  4 A . 
     
    
    
     DETAILED DESCRIPTION 
     The present disclosure provides a camera module including an imaging lens assembly and an image sensor. The image sensor is located on an image side of the imaging lens assembly. The imaging lens assembly has an optical axis and includes a plastic lens barrel and a plurality of plastic lens elements. The plurality of plastic lens elements are disposed in the plastic lens barrel. The plastic lens barrel includes an object-side outer surface, a lens barrel minimum opening, an object-side outer inclined surface and a reversing inclined surface. The object-side outer surface is a surface of the plastic lens barrel facing towards an object side and being closest to the object side and is annular. The object-side outer inclined surface is shrunk from the object-side outer surface toward the lens barrel minimum opening. The reversing inclined surface is expanded from the lens barrel minimum opening to the image side. A connecting position of the reversing inclined surface and the object-side outer inclined surface forms the lens barrel minimum opening. When a number of the plurality of plastic lens elements is N, a maximum outer diameter of the object-side outer surface is ψD, a distance between the lens barrel minimum opening and the object-side outer surface in a direction parallel to the optical axis is h, a chief ray angle between a chief ray corresponding to 1.0F image height of the imaging lens assembly and the image sensor is CRA 1.0F, the following conditions can be satisfied: 4≤N≤10; 0.8 mm&lt;ψD≤3.4 mm; 0.01 mm&lt;h&lt;0.15 mm; and CRA 1.0F&gt;25.0 degrees. The configuration of the lens barrel minimum opening can be closer to the object-side outer surface by controlling the maximum outer diameter of the object-side outer surface ψD within a proper range, so as to reduce the unnecessary reflection between the object-side outer surface and the surface plate. On the other hand, a dimensional stability of injection molding and a manufacturing quality of the lens barrel minimum opening can be maintained by keeping h in a specific range. Further, because of the configuration of the object-side outer inclined surface and the reversing inclined surface, an unexpected light reflection can be reduced and can effectively eliminate the stray light which is easy to occur in camera modules with CRA greater than a certain angle. The larger CRA makes a path of the stray light close to the lens barrel minimum opening more uniform and an efficiency of the configuration of the reversing inclined surface and parameter h for eliminating the stray light can be increased. 
     Further, the larger CRA allows the imaging lens assembly to have an exit position and a principal point closer to the image sensor so as to effectively shorten the back focal length of the imaging lens assembly, and it is favorable for maintaining the developing ability of miniaturization under the trend of increasing the number of lens elements. In contrast, in the conventional art, the CRA of the endoscope is small and the number of lens elements is maintained in a small amount, the characteristics of the large CRA cannot be fully utilized. On the other hand, most of the imaging lens assemblies with the larger CRA are difficult to achieve miniaturization due to their large size and large imaging surface area, so it is difficult to apply on portable electronic devices. 
     The imaging lens assembly can further include a light blocking sheet disposed in the plastic lens barrel and located between the lens barrel minimum opening and an object-side peripheral portion of one of the plurality of plastic lens elements being closest to the object side. The design of the reversing inclined surface makes the lens barrel minimum opening closer to the object side than the reversing inclined surface is therefrom. Therefore, the non-imaging rays form larger incidence angles can be easier to enter the reversing inclined surface, and the path of the non-imaging rays can be easier controlled, so that it is suitable for a light blocking sheet to exert maximum shadowing efficiency. 
     When a distance between the lens barrel minimum opening and the light blocking sheet in the direction parallel to the optical axis is d, the following condition can be satisfied: 0.10 mm&lt;d&lt;0.4 mm. Therefore, the shadowing efficiency of the light blocking sheet cooperating with the reversing inclined surface can be enhanced and so as to cope with environments with higher stray light intensity. Further, the following condition can be satisfied: 0.12 mm&lt;d&lt;0.4 mm. 
     When a distance parallel to the optical axis between the lens barrel minimum opening and the light blocking sheet is d, and a distance parallel to the optical axis between the lens barrel minimum opening and the object-side outer surface is h, the following condition can be satisfied: 1.0&lt;d/h&lt;15.0. Therefore, the reversing inclined surface and the light blocking sheet can capture more stray light. 
     When a maximum outer diameter of the object-side outer surface is ψD, the following condition can be satisfied: 1.0 mm&lt;ψD&lt;2.8 mm. Therefore, the manufacturability of injection molding can be maintained, and when the lens barrel minimum opening is push out to the object-side outer surface, the molding quality of the plastic lens barrel can have good dimensional accuracy. 
     The reversing inclined surface can include a plurality of strip-shaped structures extended from the lens barrel minimum opening toward a direction perpendicular to the optical axis. In detail, the strip-shaped structures can be disposed on the surface of the reversing inclined surface, which can increase the efficiency of the reversing inclined surface eliminating the high intensity non-imaging rays and is suitable for miniaturization imaging lens assembly. Therefore, the reflection generated by the surface of the light blocking sheet receiving a large amount of the stray light can be eliminated. 
     When a diameter of the lens barrel minimum opening is ψED, and a diameter of an opening of the light blocking sheet is ψs1, the following condition can be satisfied: 0.8≤ψED/ψs1≤1.05. Therefore, the shading range of the light blocking sheet can be increased, and the quality of the resolving power and the performance of the optical specification will not be influenced. Further, the following condition can be satisfied: 0.8≤ψED/ψs1≤1.0. Thus, the surface reflection generated by the opening of the light blocking sheet can be reduced. 
     The object-side outer inclined surface can be a first conical surface, the reversing inclined surface can be a second conical surface. When an angle between a sectional line passing through the optical axis of the first conical surface and a sectional line passing through the optical axis of the second conical surface is θ, and the following condition can be satisfied: 45 degrees&lt;θ&lt;120 degrees. Therefore, the probability of the surface reflection generated by the object-side outer inclined surface and the reversing inclined surface can be reduced, and the processing feasibility can be maintained. In detail, the processing feasibility may be surface fogging, cutting processing or other processing methods applied to the forming mold corresponding to the first conical surface and second conical surface, so that the above two parts after molding have better ability to eliminate stray lights. 
     Each of the aforementioned features of the camera module can be utilized in various combinations for achieving the corresponding effects. 
     The present disclosure provides an electronic device with camera functions. The electronic device includes the aforementioned camera module and a surface plate, wherein the surface plate is disposed on the object side of the camera module. When a distance between the object-side outer surface and the surface plate in the direction parallel to the optical axis is g, the following condition can be satisfied: 0.03 mm&lt;g&lt;0.3 mm. Therefore, it can avoid that the stray light enters the imaging lens assembly in an unexpected path so as to early shade the high-intensity light source via the technical characteristic h of the lens barrel minimum opening, and the stray lights after attenuated can be easily eliminated by other means of shielding stray light inside the imaging lens assembly. Further, the following condition can be satisfied: 0.03 mm&lt;g&lt;0.26 mm. 
     Further, the surface plate can be a plate having a display function module. In detail, the surface plate can be a display screen and includes a surface glass and a backlight board, and the present disclosure will not be limited thereto. 
     1st Embodiment 
       FIG.  1 A  is a schematic view of an electronic device  10  according to the 1st embodiment of the present disclosure. In  FIG.  1 A , the electronic device  10  is a full-screen mobile phone, but the present disclosure will not be limited thereto. The electronic device  10  includes a camera module  11  and a surface plate  12 . The surface plate  12  is disposed on the object side of the camera module  11 . 
     In detail,  FIG.  1 B  is a schematic view of a surface plate  12  according to the 1st embodiment of  FIG.  1 A .  FIG.  10    is a schematic view of the surface plate  12  and the camera module  11  according to the 1st embodiment of  FIG.  1 A .  FIG.  1 D  is another schematic view of the surface plate  12  and the camera module  11  according to the 1st embodiment of  FIG.  1 A . In  FIGS.  1 B,  1 C and  1 D , the surface plate  12  can be a plate having a display function module and includes a surface glass  121  and a backlight board  122 , wherein the backlight board  122  is connected to the image-side surface of the surface glass  121 , the surface glass  121  can be a glass substrate, and the backlight board  122  can be an LED and used as a light source of array light, but the present disclosure will not be limited thereto. The camera module  11  includes an imaging lens assembly (its reference numeral is omitted) and an image sensor  114 . The image sensor  114  is located at an image side of the imaging lens assembly (that is, on the imaging surface  113 ). The surface plate  12  is located at the object side of the imaging lens assembly. 
     The imaging lens assembly includes a plastic lens barrel  111  and a plurality of plastic lens elements, wherein the plurality of plastic lens elements are disposed in the plastic lens barrel  111 . From the object side to the image side are a first plastic lens element  1121 , a second plastic lens element  1122 , a third plastic lens element  1123 , a fourth plastic lens element  1124 , and a fifth plastic lens element  1125 . Specifically, in the 1st embodiment, a number of the plurality of plastic lens elements is N, and N=5. Further, the imaging lens assembly further includes a plurality of light blocking sheets  1131 ,  1132 ,  1133 , a plurality of spacer rings  1134 ,  1135  and a fixing ring  1136 . The light blocking sheets  1131 ,  1132 ,  1133 , the spacer rings  1134 ,  1135  and the fixing ring  1136  are disposed in the plastic lens barrel  111 . 
       FIG.  1 E  is a schematic view of a plastic lens barrel  111  according to the 1st embodiment of  FIG.  1 A .  FIG.  1 F  is a three-dimensional schematic view of the plastic lens barrel  111  according to the 1st embodiment of  FIG.  1 A . As shown in  FIGS.  1 E and  1 F , the plastic lens barrel  111  includes an object-side outer surface  1111 , an object-side outer inclined surface  1112 , a lens barrel minimum opening  1113  and a reversing inclined surface  1114 . The object-side outer surface  1111  is a surface of the plastic lens barrel  111  facing towards an object side and being closest to the object side and is annular. The object-side outer inclined surface  1112  is shrunk from the object-side outer surface  1111  toward the lens barrel minimum opening  1113 . The reversing inclined surface  1114  is expanded from the lens barrel minimum opening  1113  to the image side, wherein a connecting position of the reversing inclined surface  1114  and the object-side outer inclined surface  1112  forms the lens barrel minimum opening  1113 . Further, the light blocking sheet  1131  is located between the lens barrel minimum opening  1113  and an object-side peripheral portion of one of the plurality of plastic lens elements being closest to the object side (that is, the first plastic lens element  1121 ). 
       FIG.  1 G  is a schematic view of parameters h and d according to the 1st embodiment of  FIG.  1 A . As shown in  FIG.  1 G , a distance between the lens barrel minimum opening  1113  and the object-side outer surface  1111  in a direction parallel to the optical axis X is h, a distance between the lens barrel minimum opening  1113  and the light blocking sheet  1131  in the direction parallel to the optical axis X is d, and h=0.04 mm, h=0.2155 mm and d/h=5.3875. 
       FIG.  1 H  is a schematic view of a parameter θ according to the 1st embodiment of  FIG.  1 A . As shown in  FIG.  1 H , the object-side outer inclined surface  1112  is a first conical surface (its reference numeral is omitted), the reversing inclined surface  1114  is a second conical surface (its reference numeral is omitted). An angle between a sectional line passing through the optical axis X of the first conical surface and a sectional line passing through the optical axis X of the second conical surface is θ, and θ=112.63 degrees. 
       FIG.  1 I  is a schematic view of parameters ψD, ψED and ψs1 according to the 1st embodiment of  FIG.  1 A . As shown in  FIG.  1 I , a maximum outer diameter of the object-side outer surface  1111  is ψD, a diameter of the lens barrel minimum opening  1113  is ψED, a diameter of an opening of the light blocking sheet  1131  is ψs1, and ψD=2.6 mm, ψED=1.59 mm, ψs1=1.7 mm and ψED/ψs1=0.935. 
     As shown in  FIGS.  1 C and  1 D , a distance between the object-side outer surface  1111  and the surface plate  12  in the direction parallel to the optical axis X is g, and g=0.13 mm. It should be mentioned that, the backlight board  122  of the surface plate  12  has an opening  1221  corresponding to the imaging lens assembly, the area of the surface glass  121  corresponding to the opening  1221  is an imaging window which is coaxial with the imaging lens assembly so as to facilitate the imaging lens assembly to capture the image, and the distance between the object-side outer surface  1111  and the surface plate  12  in the direction parallel to the optical axis X is the distance between the object-side outer surface  1111  and the image-side surface of the surface glass  121  in the direction parallel to the optical axis X. Further, a chief ray angle between a chief ray corresponding to 1.0F image height of the imaging lens assembly and the image sensor  114  is CRA 1.0F, and CRA 1.0F=33.73 degrees. 
     2nd Embodiment 
       FIG.  2 A  is a schematic view of a surface plate  22  and a camera module  21  of an electronic device according to the 2nd embodiment of the present disclosure. In  FIG.  2 A , the electronic device (its reference numeral is omitted) includes a camera module  21  and a surface plate  22 . The surface plate  22  is disposed on the object side of the camera module  21 . 
       FIG.  2 B  is another schematic view of the surface plate  22  and the camera module  21  according to the 2nd embodiment of  FIG.  2 A .  FIG.  2 C  is another schematic view of the surface plate  12  and the camera module  21  according to the 2nd embodiment of  FIG.  2 A . In  FIGS.  2 B and  2 C , the surface plate  22  can be a plate having a display function module and includes a surface glass  221  and a backlight board  222 . The backlight board  222  can further include a circuit board or auxiliary components related to the backlight board  222 . The backlight board  222  is connected to the image-side surface of the surface glass  221 , wherein the surface glass  221  can be a glass substrate, and the backlight board  222  can be an LED used as a light source of array light, but the present disclosure will not be limited thereto. The camera module  21  includes an imaging lens assembly (its reference numeral is omitted) and an image sensor  214 . The image sensor  214  is located at an image side of the imaging lens assembly (that is, on the imaging surface  213 ). The surface plate  22  is located at the object side of the imaging lens assembly. 
     The imaging lens assembly includes a plastic lens barrel  211  and a plurality of plastic lens elements, wherein the plurality of plastic lens elements are disposed in the plastic lens barrel  211 . From the object side to the image side are a first plastic lens element  2121 , a second plastic lens element  2122 , a third plastic lens element  2123 , a fourth plastic lens element  2124 , and a fifth plastic lens element  2125 . Specifically, in the 2nd embodiment, a number of the plurality of plastic lens elements is N, and N=5. Further, the imaging lens assembly further includes a plurality of light blocking sheets  2131 ,  2132 ,  2133 , a plurality of spacer rings  2134 ,  2135  and a fixing ring  2136 . The light blocking sheets  2131 ,  2132 ,  2133 , the spacer rings  2134 ,  2135  and the fixing ring  2136  are disposed in the plastic lens barrel  211 . 
     The plastic lens barrel  211  includes an object-side outer surface  2111 , an object-side outer inclined surface  2112 , a lens barrel minimum opening  2113  and a reversing inclined surface  2114 . The object-side outer surface  2111  is a surface of the plastic lens barrel  211  facing towards an object side and being closest to the object side and is annular. The object-side outer inclined surface  2112  is shrunk from the object-side outer surface  2111  toward the lens barrel minimum opening  2113 . The reversing inclined surface  2114  is expanded from the lens barrel minimum opening  2113  to the image side, wherein a connecting position of the reversing inclined surface  2114  and the object-side outer inclined surface  2112  forms the lens barrel minimum opening  2113 . Further, the light blocking sheet  2131  is located between the lens barrel minimum opening  2113  and an object-side peripheral portion of one of the plurality of plastic lens elements being closest to the object side (that is, the first plastic lens element  2121 ). 
       FIG.  2 D  is a schematic view of parameters h and d according to the 2nd embodiment of  FIG.  2 A . As shown in  FIG.  2 D , a distance between the lens barrel minimum opening  2113  and the object-side outer surface  2111  in a direction parallel to the optical axis X is h, a distance between the lens barrel minimum opening  2113  and the light blocking sheet  2131  in the direction parallel to the optical axis X is d. In  FIG.  2 D , h=0.1155 mm, h=0.14 mm and d/h=1.2121. 
       FIG.  2 E  is a schematic view of a parameter θ according to the 2nd embodiment of  FIG.  2 A . As shown in  FIG.  2 E , the object-side outer inclined surface  2112  is a first conical surface (its reference numeral is omitted), the reversing inclined surface  2114  is a second conical surface (its reference numeral is omitted). An angle between a sectional line passing through the optical axis X of the first conical surface and a sectional line passing through the optical axis X of the second conical surface is θ, and θ=93.95 degrees. 
       FIG.  2 F  is a schematic view of parameters ψD, ψED and ψs1 according to the 2nd embodiment of  FIG.  2 A . As shown in  FIG.  2 F , a maximum outer diameter of the object-side outer surface  2111  is ψD, a diameter of the lens barrel minimum opening  2113  is ψED, a diameter of an opening of the light blocking sheet  2131  is ψs1. In  FIG.  2 F , ψD=2.6 mm, ψED=1.66 mm, ψs1=1.7 mm and ψED/ψs1=0.976. 
     As shown in  FIGS.  2 A and  2 C , a distance between the object-side outer surface  2111  and the surface plate  22  in the direction parallel to the optical axis X is g, and g=0.2 mm. It should be mentioned that, the backlight board  222  of the surface plate  22  has an opening  2221  corresponding to the imaging lens assembly, the area of the surface glass  221  corresponding to the opening  2221  is an imaging window which is coaxial with the imaging lens assembly so as to facilitate the imaging lens assembly to capture the image, and the distance between the object-side outer surface  2111  and the surface plate  22  in the direction parallel to the optical axis X is the distance between the object-side outer surface  2111  and the image-side surface of the surface glass  221  in the direction parallel to the optical axis X. Further, a chief ray angle between a chief ray corresponding to 1.0F image height of the imaging lens assembly and the image sensor  214  is CRA 1.0F, and CRA 1.0F=33.73 degrees. 
     3rd Embodiment 
       FIG.  3 A  is a schematic view of a surface plate  32  and a camera module  31  of an electronic device according to the 3rd embodiment of the present disclosure. In  FIG.  3 A , the electronic device (its reference numeral is omitted) includes a camera module  31  and a surface plate  32 . The surface plate  32  is disposed on the object side of the camera module  31 . The surface plate  32  can be a plate having a display function module and includes a surface glass  321  and a backlight board  322 , wherein the backlight board  322  is connected to the image-side surface of the surface glass  321 , the surface glass  321  can be a glass substrate, and the backlight board  322  can be an LED and used as a light source of array light, but the present disclosure will not be limited thereto. The camera module  31  includes an imaging lens assembly (its reference numeral is omitted) and an image sensor  314 . The image sensor  314  is located at an image side of the imaging lens assembly (that is, on the imaging surface  313 ). The surface plate  32  is located at the object side of the imaging lens assembly. 
     The imaging lens assembly includes a plastic lens barrel  311  and a plurality of plastic lens elements, wherein the plurality of plastic lens elements are disposed in the plastic lens barrel  311 . From the object side to the image side are a first plastic lens element  3121 , a second plastic lens element  3122 , a third plastic lens element  3123 , a fourth plastic lens element  3124 , and a fifth plastic lens element  3125 . Specifically, in the 3rd embodiment, a number of the plurality of plastic lens elements is N, and N=5. Further, the imaging lens assembly further includes a plurality of light blocking sheets  3131 ,  3132 ,  3133 , a plurality of spacer rings  3134 ,  3135  and a fixing ring  3136 . The light blocking sheets  3131 ,  3132 ,  3133 , the spacer rings  3134 ,  3135  and the fixing ring  3136  are disposed in the plastic lens barrel  311 . 
     The plastic lens barrel  311  includes an object-side outer surface  3111 , an object-side outer inclined surface  3112 , a lens barrel minimum opening  3113  and a reversing inclined surface  3114 . The object-side outer surface  3111  is a surface of the plastic lens barrel  311  facing towards an object side and being closest to the object side and is annular. The object-side outer inclined surface  3112  is shrunk from the object-side outer surface  3111  toward the lens barrel minimum opening  3113 . The reversing inclined surface  3114  is expanded from the lens barrel minimum opening  3113  to the image side, wherein a connecting position of the reversing inclined surface  3114  and the object-side outer inclined surface  3112  forms the lens barrel minimum opening  3113 . Further, the light blocking sheet  3131  is located between the lens barrel minimum opening  3113  and an object-side peripheral portion of one of the plurality of plastic lens elements being closest to the object side (that is, the first plastic lens element  3121 ). 
       FIG.  3 B  is a schematic view of parameters h and d according to the 3rd embodiment of  FIG.  3 A . As shown in  FIG.  3 B , a distance between the lens barrel minimum opening  3113  and the object-side outer surface  3111  in a direction parallel to the optical axis X is h, a distance between the lens barrel minimum opening  3113  and the light blocking sheet  3131  in the direction parallel to the optical axis X is d, and h=0.05 mm, h=0.215 mm and d/h=4.3. 
       FIG.  3 C  is a schematic view of a parameter θ according to the 3rd embodiment of  FIG.  3 A . As shown in  FIG.  3 C , the object-side outer inclined surface  3112  is a first conical surface (its reference numeral is omitted), the reversing inclined surface  3114  is a second conical surface (its reference numeral is omitted). An angle between a sectional line passing through the optical axis X of the first conical surface and a sectional line passing through the optical axis X of the second conical surface is θ, and θ=100 degrees. 
       FIG.  3 D  is a schematic view of parameters ψD, ψED and ψs1 according to the 3rd embodiment of  FIG.  3 A . As shown in  FIG.  3 D , a maximum outer diameter of the object-side outer surface  3111  is ψD, a diameter of the lens barrel minimum opening  3131  is ψED, a diameter of an opening of the light blocking sheet  3113  is ψs1, and ψD=2.1 mm, ψED=1.68 mm, ψs1=1.7 mm and ψED/s1=0.988. 
     As shown in  FIG.  3 A , a distance between the object-side outer surface  3111  and the surface plate  32  in the direction parallel to the optical axis X is g, and g=0.25 mm. It should be mentioned that, the backlight board  322  of the surface plate  32  has an opening  3221  corresponding to the imaging lens assembly, the area of the surface glass  321  corresponding to the opening  3221  is an imaging window which is coaxial with the imaging lens assembly so as to facilitate the imaging lens assembly to capture the image, and the distance between the object-side outer surface  3111  and the surface plate  32  in the direction parallel to the optical axis X is the distance between the object-side outer surface  3111  and the image-side surface of the surface glass  321  in the direction parallel to the optical axis X. Further, an angle between a chief ray correspondent to 1.0F of the imaging lens assembly and a chief ray correspondent to 1.0F of the image sensor  314  is CRA 1.0F, and CRA 1.0F=33.73 degrees. 
     4th Embodiment 
       FIG.  4 A  is a schematic view of a surface plate  42  and a camera module  41  of an electronic device according to the 4th embodiment of the present disclosure. In  FIG.  4 A , the electronic device (its reference numeral is omitted) includes a camera module  41  and a surface plate  42 . The surface plate  42  is disposed on the object side of the camera module  41 . The surface plate  42  can be a plate having a display function module and includes a surface glass  421  and a backlight board  422 . The backlight board  422  is connected to the image-side surface of the surface glass  421 , wherein the surface glass  421  can be a glass substrate, and the backlight board  422  can be an LED used as a light source of array light, but the present disclosure will not be limited thereto. The camera module  41  includes an imaging lens assembly (its reference numeral is omitted) and an image sensor  414 . The image sensor  414  is located at an image side of the imaging lens assembly (that is, on the imaging surface  413 ). The surface plate  42  is located at the object side of the imaging lens assembly. 
       FIG.  4 B  is an exploded view of an imaging lens assembly according to the 4th embodiment of  FIG.  4 A . As shown in  FIGS.  4 A and  4 B , the imaging lens assembly includes a plastic lens barrel  411  and a plurality of plastic lens elements, wherein the plurality of plastic lens elements are disposed in the plastic lens barrel  411 . From the object side to the image side are a first plastic lens element  4121 , a second plastic lens element  4122 , a third plastic lens element  4123 , a fourth plastic lens element  4124 , and a fifth plastic lens element  4125 . Specifically, in the 4th embodiment, a number of the plurality of plastic lens elements is N, and N=5. Further, the imaging lens assembly further includes a plurality of light blocking sheets  4131 ,  4132 ,  4133 , a plurality of spacer rings  4134 ,  4135  and a fixing ring  4136 . The light blocking sheets  4131 ,  4132 ,  4133 , the spacer rings  4134 ,  4135  and the fixing ring  4136  are disposed in the plastic lens barrel  411 . 
       FIG.  4 C  is a three-dimensional schematic view of a plastic lens barrel  411  according to the 4th embodiment of  FIG.  4 A . In  FIG.  4 C , the plastic lens barrel  411  includes an object-side outer surface  4111 , an object-side outer inclined surface  4112 , a lens barrel minimum opening  4113  and a reversing inclined surface  4114 . The object-side outer surface  4111  is a surface of the plastic lens barrel  411  facing towards an object side and being closest to the object side and is annular. The object-side outer inclined surface  4112  is shrunk from the object-side outer surface  4111  toward the lens barrel minimum opening  4113 . The reversing inclined surface  4114  is expanded from the lens barrel minimum opening  4113  to the image side, wherein a connecting position of the reversing inclined surface  4114  and the object-side outer inclined surface  4112  forms the lens barrel minimum opening  4113 . Further, the light blocking sheet  4131  is located between the lens barrel minimum opening  4113  and an object-side peripheral portion of one of the plurality of plastic lens elements being closest to the object side (that is, the first plastic lens element  4121 ). 
     Further, the reversing inclined surface  4114  includes a plurality of strip-shaped structures  4115  extended from the lens barrel minimum opening  4113  toward a direction perpendicular to the optical axis X. In detail, in the 4th embodiment, the strip-shaped structures  4115  are the wedge structure, and the number of the strip-shaped structures  4115  is 320. The strip-shaped structures  4115  are linearly tapered from the reversing inclined surface  4114  toward the optical axis X. 
       FIG.  4 D  is a schematic view of parameters ψD, ψED and d according to the 4th embodiment of  FIG.  4 A .  FIG.  4 E  is a schematic view of a parameter θ according to the 4th embodiment of  FIG.  4 A .  FIG.  4 F  is a schematic view of parameters h and ψs1 according to the 4th embodiment of  FIG.  4 A . As shown in  FIGS.  4 D,  4 E and  4 F , a distance between the lens barrel minimum opening  4113  and the object-side outer surface  4111  in a direction parallel to the optical axis X is h, a distance between the lens barrel minimum opening  4113  and the light blocking sheet  4131  in the direction parallel to the optical axis X is d, and h=0.04 mm, h=0.2155 mm and d/h=5.3875. The object-side outer inclined surface  4112  is a first conical surface (its reference numeral is omitted), the reversing inclined surface  4114  is a second conical surface (its reference numeral is omitted). An angle between a sectional line passing through the optical axis X of the first conical surface and a sectional line passing through the optical axis X of the second conical surface is θ, and 74 =112.63 degrees. A maximum outer diameter of the object-side outer surface  4111  is ψD, a diameter of the lens barrel minimum opening  4113  is ψED, a diameter of an opening of the light blocking sheet  4131  is ψs1, and ψD=2.6 mm, ψED=1.59 mm, ψs1=1.7 mm and ψED/ψs1=0.935. 
     As shown in  FIG.  4 A , a distance between the object-side outer surface  4111  and the surface plate  42  in the direction parallel to the optical axis X is g, and g=0.2 mm. It should be mentioned that, the backlight board  422  of the surface plate  42  corresponding to the imaging lens assembly has an opening  4221  corresponding to the imaging lens assembly, the area of the surface glass  421  corresponding to the opening  4221  is an imaging window which is coaxial with the imaging lens assembly so as to facilitate the imaging lens assembly to capture the image, and the distance between the object-side outer surface  4111  and the surface plate  42  in the direction parallel to the optical axis X is the distance between the object-side outer surface  4111  and the image-side surface of the surface glass  421  in the direction parallel to the optical axis X. Further, a chief ray angle between a chief ray corresponding to 1.0F image height of the imaging lens assembly and the image sensor  414  is CRA 1.0F, and CRA 1.0F=33.73 degrees. 
     The foregoing description, for purpose of explanation, has been described with reference to specific embodiments. It is to be noted that Tables show different data of the different embodiments; however, the data of the different embodiments are obtained from experiments. The embodiments were chosen and described in order to best explain the principles of the disclosure and its practical applications, to thereby enable others skilled in the art to best utilize the disclosure and various embodiments with various modifications as are suited to the particular use contemplated. The embodiments depicted above and the appended drawings are exemplary and are not intended to be exhaustive or to limit the scope of the present disclosure to the precise forms disclosed. Many modifications and variations are possible in view of the above teachings.