Patent Publication Number: US-2022232150-A1

Title: Camera module and electronic device having the camera module

Description:
FIELD 
     The subject matter herein generally relates to a camera module and an electronic device having the camera module. 
     BACKGROUND 
     Electronic products (such as mobile phones or tablet computers, etc.) usually contain cameras. With the development of electronic products, people have put forward higher requirements for the shooting quality and performance of cameras. When the camera shoots a scene under strong light, some strong light at a specific angle may be reflected inside the lens barrel, and then reflected on the photosensitive chip, causing obvious spots or stains in the image, which affects the imaging quality. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Implementations of the present disclosure will now be described, by way of embodiments, with reference to the attached figures. 
         FIG. 1  is a diagram of an embodiment of a camera module according to the present disclosure. 
         FIG. 2  is an exploded, diagrammatic view of an embodiment of a camera module according to the present disclosure. 
         FIG. 3  is another exploded, diagrammatic view of an embodiment of a camera module according to the present disclosure. 
         FIG. 4  is a cross-sectional view of an embodiment of the camera module taken along IV-IV line of  FIG. 1 . 
         FIG. 5  is a cross-sectional view of another embodiment of the camera module taken along IV-IV line of  FIG. 1 . 
         FIG. 6  is a diagram of an embodiment of an electronic device according to the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures, and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale, and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure. 
     The disclosure is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings, in which like references indicate similar elements. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean “at least one.” 
     The term “comprising,” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series, and the like. 
       FIG. 1  illustrates an embodiment of a camera module  100 . The camera module  100  includes a circuit board  20  and a lens assembly  10 . The lens assembly  10  is arranged on the circuit board  20 . Referring to  FIG. 2 , a photosensitive chip  30 , a mounting frame  40 , and a filter  50  are arranged between the lens assembly  10  and the circuit board  20 . 
     The circuit board  20  includes a first portion  201 , a second portion  202 , and a third portion  203 . The lens assembly  10  is mounted on the first portion  201 . The second portion  202  is connected between the first portion  201  and the third portion  203 . A surface of the circuit board  20  facing the lens assembly  10  is defined as a base surface  21 . The circuit board  20  may be a flexible circuit board, a rigid circuit board, or a flexible-rigid circuit board. In at least one embodiment, the circuit board  20  is a flexible-rigid circuit board. The first portion  201  and the third portion  203  are rigid portions of the circuit board  20 , the second portion  202  is a flexible portion of the circuit board  20 . An electrical connecting portion  32  is arranged on an area of the base surface  21  corresponding to the third portion  203 . The electrical connecting portion  32  may be a connector or golden finger to realize signal transmission between the camera module  100  and other electronic components (not shown). 
     The photosensitive chip  30  is fixed on the base surface  21  and located on the first portion  201 . A plurality of electronic elements  31  adjacent to the photosensitive chip  30  are arranged on the first portion  201 . Each electronic element  31  may be a passive component such as a resistor, a capacitor, a diode, a transistor, a relay, or an electrically erasable programmable read-only memory. 
     Referring to  FIG. 1  and  FIG. 2 , a first adhesive layer  60  is arranged between the circuit board  20  and the mounting frame  40  to fix the mounting frame  40  on the circuit board  20 . 
     Referring to  FIG. 2  and  FIG. 3 , the mounting frame  40  is arranged between the lens assembly  10  and the circuit board  20 . The mounting frame  40  may have a substantially square frame structure. A through hole  403  penetrates a center of the mounting frame  40 . The through hole  403  may be square. In other embodiments, a shape of the mounting frame  40  and a shape of the through hole  403  may be varied as needed. 
     The mounting frame  40  includes a top surface  401  facing away from the circuit board  20  and an inner surface  402  defining the through hole  403 . A protrusion  41  extends from the inner surface  402  toward a central axis of the through hole  403 . Referring to  FIG. 4 , the protrusion  41  includes a supporting surface  411  facing away from the circuit board  20 . The inner surface  402  is connected between the top surface  401  and the supporting surface  411 . A distance a between the supporting surface  411  and the base surface  21  is less than a distance b between the top surface  401  and the base surface  21 . 
     Referring to  FIG. 2  and  FIG. 3 , the protrusion  41  divides the mounting frame  40  into a first mounting area  405  and a second mounting area  406 . The second mounting area  406  is located a side of the first mounting area  405  facing the circuit board  20 . The photosensitive chip  30  and the electronic elements  31  are received in the second mounting area  406 . The filter  50  (shown in  FIG. 4 ) is mounted on the supporting surface  411  of the protrusion  41  and located in the first mounting area  405 . That is, the filter  50  and the photosensitive chip  30  are located opposite sides of the protrusion  41 . The filter  50  is fixed on the protrusion  41  through a second adhesive layer  62 . 
     Referring to  FIG. 2 ,  FIG. 3  and  FIG. 4 , a first barrier layer  51  is arranged on an edge area of a surface of the filter  50  facing away from the circuit board  20 . The first barrier layer  51  may be made of, but not limited to, black glue or light-shielding ink. The first barrier layer  51  can absorb light of different wavelengths, and can block strong light of a specific angle from being incident on the edge area of the surface of the filter  50  facing away from the circuit board  20  through the filter  50  and reflected on the photosensitive chip  30 . The first barrier layer  51  includes a first end  511  and a second end  512  facing away from the first end  511 . The first end  511  is flush with a periphery of the filter  50 . An orthographic projection of an end  412  of the protrusion  41  facing to the center of the through hole  403  on a plane of the first barrier layer  51  coincides with the second end  512  of the first barrier layer  51  or is located between the first end  511  of the first barrier layer  51  and the second end  512  of the first barrier layer  51 . That is, a distance c between the second end  512  of the first barrier layer  51  and a central axis of the through hole  403  is less than or equal to a distance d between the end  412  of the protrusion  41  and the central axis of the through hole  403 . So that the first barrier layer  51  shields the protrusion  41 , and light reflected on the photosensitive chip  30  through the protrusion  41  is reduced. 
     A gap  42  is formed between the filter  50  and the inner surface  402  of the mounting frame  40 . A second barrier layer  52  is located in the gap  42 , and a surface of the second barrier layer  52  facing away from the circuit board  20  is located at a side of the first barrier layer  51  facing away from the circuit board  20 . The second barrier layer  52  may be made of black glue or light-shielding ink. The second barrier layer  52  may be made by injecting black glue or light-shielding ink in the gap  42 . 
     A distance g between the top surface  401  of the mounting frame  40  and the supporting surface  411  of the protrusion  41  is greater than a distance f between the surface of the first barrier layer  51  facing away from the circuit board  20  between the supporting surface  411  of the protrusion  41 . It is easier for a material of the second barrier layer  52  to flow to the first barrier layer  51  during injecting. So that the second barrier layer  52  may cover at least part of the first barrier layer  51 , a corner area of the filter  50  may be completely covered by the first barrier layer  51  and the second barrier layer  52 , thereby further preventing light being incident and reflected on the photosensitive chip  30  through the corner area of the filter  50 . At the same time, the second barrier layer  52  can also prevent debris generated when the lens assembly  10  is in use from entering the second mounting area  406 . 
     Referring to  FIG. 4 , the top surface  401  of the mounting frame  40  and the inner surface  402  of the mounting frame  40  are connected by a chamfer  4041 . A distance e between the supporting surface  411  of the protrusion  41  and a junction of the chamfer  4041  and the inner surface  402  is less than the distance f between the surface of the first barrier layer  51  facing away from the circuit board  20  between the supporting surface  411  of the protrusion  41 . The chamfer  4041  acts as a guide for black glue or light-shielding ink injected into the gap  42 , which improves a production efficiency and a yield of the camera module  100 . 
     In at least one embodiment, referring to  FIG. 5 , the top surface  401  of the mounting frame  40  and the inner surface  402  of the mounting frame  40  may be connected by a step  404 . The step  404  includes a bottom surface  4040  and a side surface  4042  perpendicular to the bottom surface  4040 . An end of the bottom surface  4040  facing away from the side surface  4042  is connected to the inner surface  402 . An end of the side surface  4042  facing away from the bottom surface  4040  is connected to the top surface  401 . In at least one embodiment, the top surface  401  of the mounting frame  40  and the inner surface  402  of the mounting frame  40  may be connected by a plurality of steps  404 . 
     Referring to  FIG. 4 , the lens assembly  10  includes a lens holder  101 , a first lens barrel  102 , a second lens barrel  103 , and a third lens barrel  104  sequentially connected along a thickness direction. An opening  1011  penetrates the lens holder  101  along the thickness direction. When the lens assembly  10  is fixed on the mounting frame  40 , the opening  1011  corresponds to the through hole  403  of the mounting frame  40 . In at least one embodiment, the lens holder  101  may be a rectangular parallelepiped. Inner diameters of the first lens barrel  102 , the second lens barrel  103 , and the third lens barrel  104  decrease in order. The lens holder  101 , the first lens barrel  102 , the second lens barrel  103 , and the third lens barrel  104  may be integrally molded by plastic injection molding. 
     The lens assembly  10  may be fixed on the mounting frame  40  through a third adhesive layer  61 . 
       FIG. 6  illustrates an embodiment of an electronic device  200  including the above camera module  100 . The electronic device  200  may be, but not limited to, a mobile phone, a wearable device, a vehicle, or a monitoring device. 
     The first barrier layer  51  is arranged on an edge area of a surface of the filter  50  facing away from the circuit board  20  to absorb light of different wavelengths, and block strong light of a specific angle from being incident on the edge area of the surface of the filter  50  facing away from the circuit board  20  through the filter  50  and reflected on the photosensitive chip  30 . The second barrier layer  52  is located in the gap  42 , and a surface of the second barrier layer  53  facing away from the circuit board  20  is located at a side of the first barrier layer  51  facing away from the circuit board  20 , thereby further preventing light being incident and reflected on the photosensitive chip  30  through the corner area of the filter  50 . So that the light spots in the captured image is reduced, the sharpness of the captured image and the imaging quality can be improved. 
     It is to be understood, even though information and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the present embodiments, the disclosure is illustrative only; changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the present embodiments to the full extent indicated by the plain meaning of the terms in which the appended claims are expressed.