Abstract:
A camera module is disclosed. The camera module in accordance with the present invention includes: a printed circuit board having a grounding pad formed on one surface thereof; a housing mounted on an upper side of the printed circuit board and including a lens inside thereof; a shield covering the housing in order to shield electromagnetic waves from an outside and having an opening cavity formed therein in correspondence with a location of the grounding pad; and a solder formed in the opening cavity and connecting the shield with the grounding pad.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the benefit of Korean Patent Application No. 10-2010-0077353, filed with the Korean Intellectual Property Office on Aug. 11, 2010, the disclosure of which is incorporated herein by reference in its entirety. 
       BACKGROUND 
       [0002]    1. Technical Field 
         [0003]    The present invention is related to a cameral module. 
         [0004]    2. Background Art 
         [0005]    When a camera module is installed in a main body of a mobile device, a shield is ordinarily introduced to shield electronic interference for electronic signals outputted from an image sensor or other electronic components. 
         [0006]    When the mobile device is assembled, a grounding part is separately arranged on an external side of the shield, and a grounding pad is formed on an upper surface of a printed circuit board, and the grounding part and the grounding pad are soldered to each other. 
         [0007]    However, it is difficult to find an appropriate amount of lead that is soldered. That is, in case there is an excessive amount of soldered lead, other components and parts may be damaged, and in case the space required for soldering is expanded in order to avoid such damage, the overall size of the camera module may be increased against the trend of making the overall camera module smaller. On the contrary, in case there is an insufficient amount of soldered lead, the grounding pad and the grounding part may not be properly grounded. 
       SUMMARY 
       [0008]    The present invention provides a camera module that can be soldered in a stable manner and can properly regulate a solder. 
         [0009]    The present invention also provides a camera module that can apply an efficient space for soldering. 
         [0010]    An aspect of the present invention features a camera module, which can include: a printed circuit board having a grounding pad formed on one surface thereof; a housing mounted on an upper side of the printed circuit board and including a lens inside thereof; a shield covering the housing in order to shield electromagnetic waves from an outside and having an opening cavity formed therein in correspondence with a location of the grounding pad; and a solder formed in the opening cavity and connecting the shield with the grounding pad. 
         [0011]    The shield can include: a shield body having a shape in which a lower side thereof is open; and a plurality of covers having a shape of protruding downwardly at a lower end part of the shield body. 
         [0012]    The plurality of covers can be separated from one another, and a space between the separated plurality of covers can form the opening cavity. 
         [0013]    The cover can be bent toward an outside so as to form an inner space for accommodating solder that is excessively injected. 
         [0014]    The opening cavity can be formed at a corner of the shield. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0015]      FIG. 1  is a separated perspective view showing a camera module in accordance with an embodiment of the present invention. 
           [0016]      FIG. 2  is a perspective view showing an opening cavity of a camera module in accordance with an embodiment of the present invention. 
           [0017]      FIG. 3  is a side view showing the opening cavity of a camera module in accordance with an embodiment of the present invention. 
           [0018]      FIG. 4  is a perspective view showing a solder formed in the opening cavity of a camera module in accordance with an embodiment of the present invention. 
           [0019]      FIG. 5  is a cross-sectional view showing the solder formed in the opening cavity of a camera module in accordance with an embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION 
       [0020]    Since there can be a variety of permutations and embodiments of the present invention, certain embodiments will be illustrated and described with reference to the accompanying drawings. This, however, is by no means to restrict the present invention to certain embodiments, and shall be construed as including all permutations, equivalents and substitutes covered by the ideas and scope of the present invention. Throughout the description of the present invention, when describing a certain technology is determined to evade the point of the present invention, the pertinent detailed description will be omitted. 
         [0021]    Terms such as “first” and “second” can be used in describing various elements, but the above elements shall not be restricted to the above terms. The above terms are used only to distinguish one element from the other. 
         [0022]    The terms used in the description are intended to describe certain embodiments only, and shall by no means restrict the present invention. Unless clearly used otherwise, expressions in a singular form include a meaning of a plural form. In the present description, an expression such as “comprising” or “including” is intended to designate a characteristic, a number, a step, an operation, an element, a part or combinations thereof, and shall not be construed to preclude any presence or possibility of one or more other characteristics, numbers, steps, operations, elements, parts or combinations thereof. 
         [0023]    Hereinafter, a certain embodiment of a camera module in accordance with the present invention will be described in detail with reference to the accompanying drawings. Identical or corresponding elements will be given the same reference numerals, regardless of the figure number, and any redundant description of the identical or corresponding elements will not be repeated. 
         [0024]      FIG. 1  is a separated perspective view showing a camera module in accordance with an embodiment of the present invention, and  FIGS. 2 to 5  show a portion of the camera module in accordance with an embodiment of the present invention. 
         [0025]    Referring to  FIGS. 1 to 5 , a camera module  100 , a printed circuit board  110 , a grounding pad  111 , a housing  120 , a lens  121 , a shield  130 , a shield body  133 , a cover  135 , an opening cavity  137  and a solder  140  are illustrated. 
         [0026]    The printed circuit board  110  has the grounding pad  111  formed on one surface thereof. The printed circuit board  110  is electrically connected with a main board (not shown) and can be formed with a circuit pattern such that electrical signals can be inputted and outputted. Also, it is possible that the printed circuit board  110  is embodied in a module together with an image sensor (not shown) and that various kinds of electronic and electrical components, such as condenser, resistor, etc., for driving the image sensor can be mounted in the printed circuit board  110 . 
         [0027]    The housing  120  is mounted over the printed circuit board  110  and has the lens  121  inside thereof. 
         [0028]    An adhesive is coated on one surface of the housing  120  that comes in contact with the printed circuit board  110  to allow the housing  120  and printed circuit board  110  to be coupled to each other. It shall be appreciated that the housing  120  and the printed circuit board  110  can be also coupled by various other physical/chemical coupling methods. 
         [0029]    There can be at least one lens  121  inside the housing  120 , and it is possible to perform a function of allowing an external light source to be focused on the image sensor through the lens  121 . 
         [0030]    The housing  120  can be formed in a hollow type such that a path for the light source inputted through the lens  121  can be provided, and a portion of an upper part of the housing  120  is opened. By coupling the lens  121  to an inside of the upper part of the housing  120  and coupling the printed circuit board  110 , in which the image sensor is mounted, to a lower part of the housing  120 , it becomes possible for the light source that has passed through the lens  121  to reach the image sensor through the inside of the hollow-type housing  120 . 
         [0031]    The shield  130 , which shields the interference of electromagnetic waves, can be arranged on an external side of the housing  120 , and the shield  130  can surround an upper part of the printed circuit board  110 . For example, a space for mounting a configuration such as the housing  120  is formed inside a hexahedral shield  130 . 
         [0032]    The shield  130 , the housing  120  and the grounding pad  111  are soldered, but controlling the amount of lead for such soldering is not easy. This is because the external appearance may be poor or the electromagnetic waves may not be shielded due to failure of grounding, if the amount of soldering is incorrectly controlled due to the difficulty in soldering area or soldering size. 
         [0033]    However, in the present embodiment, the shield  130  covers the housing  120  in order to shield the electromagnetic waves from the outside, and the opening cavity  137  is formed to correspond to the location of the grounding pad  111 . 
         [0034]    The shield  130  can be made of a metallic material in order to be connected with the grounding pad  111 , and such metallic material can be, for example, aluminum, which is less expensive than gold and copper and thus can save the production cost. 
         [0035]    The shield  130  can include the shield body  133 , the cover  135  and the opening cavity  137 . 
         [0036]    The shield body  133  can have a shape in which a bottom side thereof is open. For example, the shield body  133  in a hexahedral shape covers the housing  120 , and an upper part of the shield body  133  has an opening  131  that is open together with the housing  120  about an optical axis, such that a path for the light source can be provided. 
         [0037]    The cover  135  can be arranged in a plural number in the shape of protruding downwardly at a lower end part of the shield body  133 . The plurality of covers  135  are separated from one another, and a space  136  between the plurality of separated covers  135  can form the opening cavity  137 . 
         [0038]    For example, the grounding pad  111  can be formed at a corner of the printed circuit board  110 , and the opening cavity  137  can be formed at a corner of the shield  130  in correspondence with the location of the grounding pad  111 . 
         [0039]    The opening cavity  137  can be a space formed by removing one side of the cover  135  by way of drilling, milling, punching, etc. On the contrary, the opening cavity  137  can be a space formed by making a transverse length of the cover  135  shorter than a transverse length of the shield body  133 . 
         [0040]    The plurality of covers  135  can be formed at the lower end part of the shield body  133  along a transverse-lengthwise direction of each side wall of the shield body  133 . The covers  135  can be separated from one another so that the opening cavity  137  can be formed at a corner of the shield  130 , and the cover  135  can be placed at a lower center area of each side wall of the shield body  133 . The cover  135  can have the shape of a rectangular parallelepiped with a longer transverse length. 
         [0041]    The cover  135  can accommodate the solder  140  that is excessively injected. For this, the space  136  can be formed on one side of the cover  135 . For example, as the cover  135  can be extended to a lower side of the shield cover  133  and bent toward the outside, the space  136  can be formed between the cover  135  and the housing  120  facing the cover  135  due to the cover  135  that is bent toward the outside and separated from the housing  120 . 
         [0042]    Accordingly, if the solder  140  is excessively injected between the grounding pad  111  and the opening cavity  137 , the solder  140  can enter the space  136  between the housing  120  and the cover  135  and can be prevented from overflowing by. 
         [0043]    Here, the solder  140  is formed in the opening cavity  137  to connect the shield  130  with the grounding pad  111 . By forming the solder  140  by use of soldering, the grounding pad  111 , the housing  120  and the shield  130  can be connected with one another. 
         [0044]    The camera module in accordance with the embodiment described above can prevent the solder, even if it is excessively injected, from short-circuiting other components of the mobile device and reduce defective production by preventing poor appearance caused by soldering. 
         [0045]    Moreover, the camera module in accordance with the embodiment described above can reduce the size of the camera module because the solder can be formed inside the shield without forming the grounding part on the outside of the shield. 
         [0046]    Although a certain embodiment of the present invention has been described, it shall be appreciated that there can be a very large number of permutations and modification of the present invention by those who are ordinarily skilled in the art to which the present invention pertains without departing from the technical ideas and boundaries of the present invention, which shall be defined by the claims appended below. 
         [0047]    It shall be also appreciated that many other embodiments other than the embodiment described above are included in the claims of the present invention.