Abstract:
An image capturing device and its assembly method are disclosed. The image capturing device comprises a main board, a metal plate and a sensing unit. The main board comprises a first hollowed block. The metal plate comprises a second hollowed block corresponded to the first hollowed block and is disposed at one side of the main board. The sensing unit is disposed at the other side of the main board. The metal plate is parallel to the sensing element. The first hollowed block and the second hollowed block are filled by a fastening material. In addition, the image plane of the sensing unit is perpendicular to the optical axis of the lens set. Therefore, image quality is improved.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to an image capturing device and an assembly method thereof, and more particularly to an image capturing device and an assembly method thereof capable of aligning a lens set and a photosensitive element. 
         [0003]    2. Description of the Related Art 
         [0004]    In the manner of calibrating the level of a conventional image sensing element, the reflection of a light beam irradiated from a lens is detected to check whether or not the image sensing element is vertical to the normal-line of the lens. Upon the detecting result, the operator continues adjusting the inclination of the circuit board carrying the image sensing element until the image sensing element is vertical to the normal-line of the lens, and the calibrated image sensing element is arranged a flexible printed circuit board for electric connection with the external circuit. 
         [0005]    The conventional calibration manner is time and labor consuming and needs an extra flexible printed circuit board also increase cost. Therefore, for the purpose of cost down, the image sensing element and external circuit are designed to directly arrange on one printed circuit board, but the printed circuit board will be bent after calibration. Bending the whole circuit board may cause deformation, and the stress generated from the deformation may pull and drag the soldering between the image sensing element and the circuit board to crack these soldering. Consequently, the image sensing element may not receive control signals and may not transmit image signals. 
         [0006]    Designing an image capturing device and its assembly method capable of aligning the lens set and the photosensitive element has become an important issue in the market application so as to satisfy the demands. 
       SUMMARY OF THE INVENTION 
       [0007]    In view of the shortcomings of the prior art, the inventor(s) of the present invention based on years of experience in the related industry to conduct extensive researches and experiments, and finally developed an image capturing device and its assembly method as a principle objective to overcome the problem of complicated alignment between a photosensitive element and a lens set in the prior art. 
         [0008]    To achieve the foregoing objective, an image capturing device is provided and comprises a main board, a metal plate and a photosensitive element. The main board comprises a first hollowed block. The metal plate comprises a second hollowed block corresponding to the first hollowed block and is disposed to one side of the main board. The photosensitive element is disposed to the other side of the main board. The metal plate and the photosensitive element are parallel to each other. The first hollowed block and the second hollowed block are filled with a fastening material. 
         [0009]    The main board comprises at least one first tooling hole. The metal plate further comprises at least a second tooling hole corresponding to each first tooling hole. Each first tooling hole and the second tooling hole corresponding to each first tooling hole are positioned by a tooling component. 
         [0010]    The main board further comprises at least a first screw hole. The metal plate further comprises at least a second screw hole corresponding to each first screw hole. 
         [0011]    The invention further comprises a lens set. The lens set and the photosensitive element are disposed on the side of the main board. An image sensing face of the photosensitive element is vertical to an optical axis of the lens set. 
         [0012]    According to an objective of the invention, an assembly method for an image capturing device is provided and comprising the following steps: providing a main board comprising a first hollowed block; disposing a metal plate at one side of the main board, the metal plate comprising a second hollowed block corresponding to the first hollowed block; disposing a photosensitive element at the other side of the main board; regulating the main board to keep the metal plate parallel with the photosensitive element; and placing a fastening material in the first hollowed block and the second hollowed block. 
         [0013]    The method further comprises the following step: screwing at least a first screw hole of the main board and at least a second screw hole of the metal plate corresponding to each first screw hole through at least a screw component. 
         [0014]    The method further comprises the following step: disposing a lens set at a side of the main board, wherein the lens set and the photosensitive element are on the same side and an image sensing face of the photosensitive element is vertical to an optical axis of the lens set. 
         [0015]    According to an objective of the invention, an image capturing device is further provided and comprises a main board, a metal plate and a photosensitive element. The main board comprises at least a first tooling hole. The metal plate comprises at least a second tooling hole corresponding to each first tooling hole and is disposed to one side of the main board. The photosensitive element is disposed to the other side of the main board. The metal board and the photosensitive element are parallel to each other. Each first tooling hole and the second tooling hole corresponding to each first tooling hole are positioned by a tooling component. 
         [0016]    The main board further comprises a first hollowed block. The metal plate further comprises a second hollowed block corresponding to the first hollowed block. The first hollowed block and the second hollowed block are filled with a fastening material. 
         [0017]    The invention further comprises a lens set. The lens set and the photosensitive element are disposed on the same side of the main board. An image sensing face of the photosensitive element is vertical to the optical axis of the lens set. 
         [0018]    The fastening material comprises an UV glue. The image capturing device and its assembly method of the invention can have one or more advantages as the following.
       (1) The image capturing device and its assembly method can fasten the relative relationship among the sensing element, the main board and the metal plate through the UV glue after positioning them through jigs. The complicated process for alignment between the image sensing element and the lens set can be further reduced.   (2) The image capturing device and its assembly method allow the image sensing face of the photosensitive element to be vertical to the optical axis of the lens set to further improve the quality of captured images.       
 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0021]      FIG. 1  is a first schematic diagram of an image capturing device in accordance with an embodiment of the invention; 
           [0022]      FIG. 2  is a first schematic diagram of a portion structure of an image capturing device in accordance with an embodiment of the invention; 
           [0023]      FIG. 3  is a second schematic diagram of a portion structure of an image capturing device in accordance with an embodiment of the invention; 
           [0024]      FIG. 4  is a second schematic diagram of a portion structure of an image capturing device in accordance with an embodiment of the invention; 
           [0025]      FIG. 5  is a schematic diagram of an electronic device having image capturing function in accordance with an embodiment of the invention; 
           [0026]      FIG. 6  is a flowchart of an assembly method for image capturing device in accordance with the invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0027]    The foregoing and other technical characteristics of the present invention will become apparent with the detailed description of the preferred embodiments and the illustration of the related drawings. 
         [0028]    An image capturing device of the invention can be a portable electronic apparatus having image capturing function such as a digital camera, a camera phone, a Smartphone or a digital video camera. To understand technical features of the invention, the following example takes, but not limited to, the camera phone as an embodiment. 
         [0029]    With reference to  FIG. 1  for a first schematic diagram of an image capturing device in accordance with an embodiment of the invention is depicted. The image capturing device  1  of the invention comprises a main board  10 , a metal plate  11 , a photosensitive element  12 , a lens set  13  and a frame  14 . With reference to  FIG. 2  for a first schematic diagram of a portion structure of an image capturing device in accordance with an embodiment of the invention is depicted. The main board  10  comprises a first hollowed block  101 , and the main board  10  can be a printed circuit board (PCB). The metal plate  11  can be disposed to a side of the main board  10  and comprises a second hollowed block  111  corresponding to the first hollowed block  101 . In the embodiment, the metal plate  11  can be disposed under the main board  10 . The position of the second hollowed block  111  of the metal plate  11  can correspond to the position of the first hollowed block  101 . Further, the photosensitive element  12  can be disposed to another side of the main board  10  corresponding to the metal plate  11 . The photosensitive element can be a complementary metal-oxide-semiconductor (CMOS) or a charge-coupled-device (CCD). 
         [0030]    With reference to  FIG. 3  for a second schematic diagram of a portion structure of an image capturing device in accordance with an embodiment of the invention is depicted. The image capturing device  1  of the invention can keep the metal plate  11  parallel with the photosensitive element  12  by regulating the inclination of the main board  10 . Next, a fastening material  15  is placed in the first hollowed block  101  and the second hollowed block  111 . Accordingly, the photosensitive element  12  and the metal plate  11  that are aligned are fastened to two sides of the main board  10  in parallel. In the embodiment, the fastening material  15  is, but not limited to, preferably an UV glue while in actual implementation. 
         [0031]    The main board  10  of the image capturing device  1  of the invention comprises at least one first tooling hole. The metal plate  11  can include a second tooling hole corresponding to the first tooling hole. In the embodiment, the main board  10  can include two first tooling holes  102 . The metal plate  11  can include two second tooling holes  112 . Further, the main board  10  can comprise at least one screw hole. The metal plate  11  can comprise a second screw hole corresponding to the first screw hole. In the embodiment, the main board  10  can comprise two first screw holes  103 . The metal plate  11  can comprise two second screw holes  113 . It should be noted that numbers of the tooling hole and the screw hole are not limited to the foregoing manner while in actual implementation. 
         [0032]    With reference to  FIG. 4  for a second schematic diagram of a portion structure of an image capturing device in accordance with an embodiment of the invention is depicted. In the embodiment, the lens set  13  of the image capturing device  1  and the photosensitive element  12  can be disposed on the same side of the main board  10 . The lens set has two first protrusion portions  131  and two second protrusion portions  132 . The two first protrusion portions  131  (tooling component or tooling pin) can respectively pass through the first tooling hole  102  of the main board  10  to the second tooling hole  112  of the metal plate  11  so as to position relative positions of the lens set  13 , the main board  10  and the metal plate  11 . The two second protrusion portions  132  can respectively pass through the first screw holes  103  of the main board  10  to a surface of the metal plate  11  with the second screw holes  113 . The second protrusion portions  132  and the second screw holes  113  can be respectively fastened by a screw component  16 . In the embodiment, the screw component  16  can be preferably a screw. Those people having ordinary skill in the art should understand that the positioning embodiment of the tooling component and the embodiment the screw component are not limited to the foregoing description while in actual implementation. 
         [0033]    The image sensing face  121  of the photosensitive element  12  of the image capturing device  1  can be vertical to the optical axis  133  of the lens set  13  so that the image quality is increased. In addition, a side of the lens set  13  is fastened by another screw component  17  (in the embodiment, the screw component  17  can be preferably a screw) on a camera frame  14  to complete the installation of the image capturing device  1  of the invention. 
         [0034]    People having ordinary skill in the art should understand that the embodiment of the foregoing tooling holes, screw holes, tooling components, screw components and the lens set fastened to the camera frame are only examples instead of limitation while actually implementing the invention. 
         [0035]    With reference to  FIG. 5  for a schematic diagram of an electronic device having image capturing function in accordance with an embodiment of the invention is depicted. The electronic device  5  comprises a main body  50 , an input device  51  and an image capturing device  1 . The image capturing device  1  is disposed to the main body  50  and electrically connected to the input device  51 . The image capturing device  1  comprises the main board, the metal plate, the photosensitive element, the lens set, the frame and related modules required for image capturing. The detail description of the image capturing device  1  herein has been depicted and there is no need to describe herein. It should be noted that the electronic device  5  of the invention can be different kinds of portable hand-held devices such as the digital camera, a multimedia player having photographing function, the mobile phone having photographing function, the Smartphone, a navigator, a tablet computer having photographing function or a personal digital assistant. The camera phone disclosed by the embodiment is only an example instead of limitation. People having ordinary skill in the art can easily replace the camera phone with other devices to incorporate the image capturing device of the invention into. 
         [0036]    Although the concept of the assembly method for image capturing device of the invention has been simultaneously depicted in the process of illustrating the image capturing device, another flowchart is provided to clearly clarify. 
         [0037]    With reference to  FIG. 6  for a flowchart of an assembly method for image capturing device is depicted. The assembly method for image capturing device comprises the following steps: 
         [0038]    Step S 61 : providing a main board comprising a first hollowed block; 
         [0039]    Step S 62 : disposing a metal plate at one side of the main board, wherein the metal plate comprises a second hollowed block corresponding to the first hollowed block; 
         [0040]    Step S 63 : disposing a photosensitive element to the other side of the main board; 
         [0041]    Step S 64 : regulating the main board to keep the metal plate parallel with the photosensitive element; 
         [0042]    Step S 65 : placing a fastening material in the first hollowed block and the second hollowed block. 
         [0043]    The detail depiction and embodiments of the assembly method for image capturing device of the invention have been illustrated in the prior description of the image capturing device and the electronic device, and there is no need to describe herein. 
         [0044]    The image capturing device and the assembly method of the invention can fasten relative relationships among the photosensitive element, the main board and the metal plate through the UV glue after positioning them through jigs. The complicated process of aligning between the image photosensitive element and the lens set can be further reduced. In addition, the image sensing face of the photosensitive element is vertical to the optical axis of the lens set to further improve the quality of captured images. 
         [0045]    The invention improves over the prior art and complies with patent application requirements, and thus is duly filed for patent application. While the invention has been described by device of specific embodiments, numerous modifications and variations could be made thereto by those generally skilled in the art without departing from the scope and spirit of the invention set forth in the claims.