Patent Publication Number: US-2016227077-A1

Title: Digital imaging camera unibody housing and method for assembling electronics inside the housing

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     Provisional application No. U.S. 61/874,387, filed on Jun. 9, 2013. 
    
    
     BACKGROUND 
     1. Field of the Invention 
     The disclosed invention relates to digital imaging cameras particularly but not exclusively for industrial, machine-vision, scientific, medical and CCTV applications. 
     2. Description of the Related Art 
     Conventional imaging cameras consist of multiple parts including housings with lens mount flanges, electronic circuit boards, infrared cut-off filters and interface connectors. Manufactures look for ways to produce damage resistant, cheap and environmentally protected housing for cameras. 
     Embodiments of the present invention aim to provide easily manufactured and assembled miniature digital cameras which are more robust and better protected than conventional imaging cameras. 
     It is a usual manufacturing practice to produce the housing from parts and to join them by screws or other connection elements. Junctures can let moisture or dust into the camera. The advantage of the disclosed camera model is a unibody housing which provides better environmental protection. Camera hermiticity ensures stability and durability of operation. 
     Another advantage of the unibody housing is that it is cheaper, easier and quicker to produce and more convenient to use. 
     The advantage of the disclosed camera assembling method is its quickness and simplicity. The camera parts are inserted into the housing through the lens flange and joined together by a fixture ring or screws in one operation. 
     SUMMARY OF THE INVENTION 
     The disclosed digital imaging camera housing has generally circular or rectangular shape, with at least one body element. The housing is closed from all sides except from the lens mount and contains at least one communication connector. The preferred embodiments are represented on the drawings for two different lens types: C-mount or bayonet. 
     The camera circuit board is installed into the housing through the open lens mount side. Then the board is attached to the inner side of the housing with screws, locks, latches or any other fixture type. 
     The camera electronics can be protected from the lens mount side of the housing with a piece of transparent material, preferably glass. An infrared cut-off filter can be used for this purpose. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The drawings present two examples of the camera housing with two different lens types. The camera assembling method illustrated for these examples is also suitable for other types of lens mounts. 
         FIG. 1 a    is an exploded perspective view of the imaging camera assembly parts with the C-mount lens and the circuit board fixed with fixture ring. The lens  7  shown on the view is not part of the basic camera assembly and is included for illustration purposes. 
         FIG. 1 b    is a cross-sectional side view of the imaging camera represented on of  FIG. 1 a    in the assemblage condition. 
         FIG. 2 a    is an exploded perspective view of the imaging camera assembly parts with the bayonet lens mount and the circuit board fixed with screws. 
         FIG. 2 b    is a cross-sectional side view of the imaging camera represented on  FIG. 2 a    in the assemblage condition. 
         FIG. 3  illustrates the camera assembling method in which the circuit board is fixed inside the housing by a fixture ring. 
         FIG. 4  illustrates the camera assembling method in which the circuit board is fixed inside the housing by two screws. 
     
    
    
     REFERENCE NUMERALS IN THE DRAWINGS 
       
     
       
         
           
               
               
             
               
                   
               
             
            
               
                 1 unibody housing for 
                 2 C-mount flange 
               
               
                 C-mount lens 
               
               
                 3 circuit board 
                 4 image sensor 
               
               
                 5 fixture ring 
                 6 infrared cut-off filter 
               
               
                 7 C-mount lens 
                 8 communication connector 
               
               
                 9 opening 
                 13 unibody housing for bayonet lens 
               
               
                 14 bayonet flange 
                 15 circuit board 
               
               
                 16, 16′ screw holes 
                 17 image sensor 
               
               
                 18 diaphragm 
                 19, 19′ screw holes 
               
               
                 20, 20′ screws 
                 21 mounting hole 
               
               
                 22 communication connector 
                 23 opening 
               
               
                   
               
            
           
         
       
     
     DETAILED DESCRIPTION OF THE INVENTION 
     Reference will now be made in detail to the particular embodiments illustrated in the accompanying drawings. 
       FIG. 1 a    illustrates parts of the camera assembly with C-mount lens according to the first embodiment of the present invention. As shown in  FIG. 1   a,  the camera assembly parts include unibody housing  1  with C-mount flange  2 , circuit board  3  with digital sensor  4 , and fixture ring  5  with infrared cut-off filter  6 . The C-mount lens  7  is not part of the basic camera assembly and can be connected later. 
     The unibody housing can be milled from one piece of metal, casted metal, or stamped plastic. Its inside diameter is defined by (but not limited to) the size of the lens mount. 
       FIG. 3  describes the method of assembling the camera parts shown on  FIG. 1   a.  Circuit board  3  with image sensor  4  is inserted into the unibody housing  1  through the C-mount lens flange  2 . The circuit board  3  is inserted into the housing the way that the communication connector  8  on the circuit board fits in the opening  9  on the housing. 
     The circuit board  3  is attached to the body with fixture ring  5 . The fixture ring  5  is screwed into the housing  1  to force the circuit board  3  against the inner back side of the housing. The circuit board  5  should be designed so that some free space on its edge is left for the fixture ring for producing connection. Infrared cut-off filter  6  is mounted on the fixture  5 . Then lens  7  is screwed into the C-mount flange  2 . 
     There is at least one opening  9  in the housing  1  for inserting communication connector  8 , as shown in  FIG. 1 . b . The number, shape and size of the openings are defined by the camera design. They can be located on back or side surface of the housing and serve for communication connectors, indicators or other functions. 
     Another embodiment example of the invention is the camera assembly with a bayonet lens mount shown on  FIG. 2   a.  The assembly parts include unibody housing element  13 , circuit board  15  with image sensor  17  and diaphragm  19  with opening  12 . Both the circuit board and the diaphragm have screw holes marked with numbers  16 ,  16 ′ and  19 ,  19 ′ respectively for screws  20 ,  20 ′. The four mounting holes  21  shown in this embodiment can be used for mounting the camera. 
       FIG. 4  describes the method of assembling the camera parts shown on  FIG. 1   b.  Circuit board  15  with image sensor  17  is inserted into the unibody housing  13  through the bayonet lens flange  14 . The board  15  and the diaphragm  18  are fitted together inside the camera body with two screws  20  and  20 ′. The screw threads are cut into the inner back side of the housing  1 .