Patent Publication Number: US-2019170915-A1

Title: Light shielding member, method for manufacturing the same and camera module using the same

Description:
FIELD 
     The subject matter herein generally relates to image capture, method for manufacturing light shield and camera module using the same. 
     BACKGROUND 
     Generally, a lens module comprises a lens barrel, a shading plate arranged in the lens barrel. However, the light shading plate is formed by printing ink on a predetermined location of a large glass using screen printing, then the large glass is cut into a single plate, and then the single plate is assembled into the lens module. Because screen printing requires the development of molding, this process is time consuming. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Implementations of the present technology will now be described, by way of example only, with reference to the attached figures. 
         FIG. 1  is a schematic view of a camera module in one exemplary embodiment. 
         FIG. 2  is an exploded view of the camera module in  FIG. 1 . 
         FIG. 3  is a cross-sectional view of the camera module in  FIG. 1 . 
         FIG. 4  is a schematic view of a light shielding member in one exemplary embodiment. 
         FIG. 5  is a flowchart of a manufacturing method for a light shielding member. 
     
    
    
     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 illustrate details and features of the present disclosure better. 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.” 
     Several definitions that apply throughout this disclosure will now be presented. 
     The term “substantially” is defined to be essentially conforming to the particular dimension, shape, or other feature that the term modifies, such that the component need not be exact. For example, “substantially cylindrical” means that the object resembles a cylinder, but can have one or more deviations from a true cylinder. 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. The references “a plurality of” and “a number of” mean “at least two.” 
       FIGS. 1 ˜ 3  illustrate a camera module  100  according to one embodiment. The camera module  100  includes a lens holder  10 , a lens module  20 , a light shielding member  30 , a printed circuit board  40 , and an imaging sensor chip  50  mounted on the printed circuit board  40 . 
     The lens holder  10  is configured to receive lens module  20 , the lens holder  10  can also be a voice coil motor. In the illustrate embodiment, the lens holder  10  comprises a base  12  and a first joint portion  14  protruding from the base  12 . The first joint portion  14  is substantially a hollow cylinder and configured to receive the lens module  20 . The lens module  20  includes at least one lens. 
     In the embodiment, the inner surface  103  of the first joint portion  14  includes a plurality of internal threads. The lens module  20  includes a second joint portion  21  matching the shape of the inner surface  103  of the first joint portion  14 , the outer surface  203  of the second joint portion  21  includes a plurality of external threads, and the lens camera  20  can thus be screwed into the lens holder  10 . 
     In other embodiments, the lens camera  20  and the lens holder  10  are not threaded combination or are integrally formed in a mold. That is to say, the external threads and the internal threads can be omitted. 
     The lower end of the inner surface  103  of the base  12  is arranged with a supporting flange  105  extending along a radial direction of the lens holder  10 , and the light shielding member  30  is mounted on the supporting flange  105 . The light shielding member  30  can be a round shape, a rectangle, or a polygon. In the illustrated embodiment, the light shielding member  30  has a rectangle shape. 
     The light shielding member  30  includes a transparent plate  31 . The light shielding member  30  can be a round shape, a rectangle, or a polygon. The transparent plate  31  is made from glass or plastic. The transparent plate  31  includes a light permeable area  315  and a light shielding area  316  that surrounds the light permeable area  315 . In the illustrated embodiment, the light permeable area  315  is a through hole passing through the transparent plate  31 . 
     The light shielding area  316  is an opaque adhesive  318 , in the present embodiment, the light shielding area  316  is a black adhesive formed on the light shielding area  316 . The opaque adhesive  318  can be formed on one surface of the transparent plate  31  or two opposing surfaces of the transparent plate  31 . In the illustrated embodiment, the opaque adhesive  318  is formed on one surface of the transparent plate  31 . The light shielding member  30  is fixed on the supporting flange  105  via the opaque adhesive  318 . 
     The supporting flange  105  includes a top surface  106  and a bottom surface  107  opposite to the top surface  106 . The light shielding member  30  is mounted on the bottom surface  107  and part of the opaque adhesive  318  is exposed from the supporting flange  105 , as shown in  FIG. 3 . The exposed portion of the opaque adhesive  318  adsorbs dust or other particles fallen on the light shielding member  30 . 
     The printed circuit board  40  is a flexible printed circuit board, a rigid-flexible printed circuit board, or a ceramic substrate. 
     The imaging sensor chip  50  is electrically connected with the printed circuit board  40 . The imaging sensor chip  50  includes a plurality of edge connectors  52  (gold fingers) arranged peripherally thereon. The printed circuit board  40  includes a plurality of pads  42 , and the pads  42  are electrically connected with the gold fingers  52  via wires, such as gold wires. The printed circuit board  40  is also provided with a number of electronic components  46  to improve performance of the imaging sensor chip  50 , for example, the electronic components  46  can be resistors and capacitors. The light shielding element  30  is configured to adsorb light rays reflecting off the wires, and glare is prevented, thus, improving the imaging quality of the lens module  100 . 
     Rim of the second joint portion  21  further comprises a flange  23  thereon, and a number of adjustment bumps  25  are formed on the flange  23 . The adjustment bumps  25  can be used in adjusting optical axis of the lens module  20 . 
     The camera module  100  further comprises a plurality of fixing members  60 , as shown in  FIG. 2 , and each fixing member  60  is arranged between two adjacent adjustment bumps  25 . The fixing member  60  is substantially L-shaped, and comprises a first portion  61  and a second portion  62  perpendicularly connected to the first portion  61 . The first portion  61  is fixed on the flange  23 , and the second portion  62  is inserted into the gap formed between the lens module  20  and the lens holder  10 . The fixing member  60  is configured to fix the lens module  20  and the lens holder  10  and prevent dust fallen inside the lens holder  10 . 
       FIG. 4  illustrates a light shielding member  301  according to another embodiment. The light shielding member  301  in  FIG. 4  is similar to the light shielding member  30  in  FIGS. 2-3 . The difference between the light shielding member  301  and the light shielding member  30  in  FIGS. 2-3  is that the light permeable area  325  of the light shielding member  301  is part of the transparent plate  31  surrounded by the light shielding area  316 . 
     The light permeable area  325  is formed with a functional filter film  330 . The functional filter film  330  is one of an infrared light cut-off filter film, an ultraviolet cut-off filter film, a low pass filter film, and an antireflective film. The functional filter film  330  is able to be formed on two opposite surfaces of the light permeable area  325 , or formed on only one surface on the light permeable area  325 . 
       FIG. 5  illustrates a method for manufacturing light shielding member  301  according to one embodiment. The method is provided by way of example as there are a variety of ways to carry out the method. The method can begin at block  501 . 
     At block  501 , a large transparent carrier sheet is provided. 
     At block  502 , the transparent carrier sheet is cut into a plurality of transparent plates, each transparent plate defines a light permeable area and a predetermined edge area surrounding the light permeable area. 
     At block  503 , a opaque adhesive is coated on the predetermined edge area to form a light shielding area. 
     At block  504 , a functional filter film  330  is formed on the light permeable area. The functional filter film is one of an infrared light cut-off filter film, an ultraviolet cut-off filter film, a low pass filter film, and an antireflective film. 
     The embodiments shown and described above are only examples. Therefore, many commonly-known features and details are neither shown nor described. Even though numerous characteristics and advantages of the present technology have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes may be made in the detail, including in matters of shape, size, and arrangement of the parts within the principles of the present disclosure, up to and including the full extent established by the broad general meaning of the terms used in the claims. It will, therefore, be appreciated that the embodiments described above may be modified within the scope of the claims.