Patent Publication Number: US-2017351048-A1

Title: Shielding plate of lens structure and lens structure

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to a shielding plate of lens structure and a lens structure. 
     Description of the Prior Art 
     A common lens structure is usually provided with a shielding plate to decrease diffused light, and the shielding plate is often round and has a through hole at an center thereof for light to pass therethrough. However, because the shielding plate is disposed between a lens base and a lens, and the shielding plate is abutted against by the lens, a stress is produced. The lens receives a counterforce from the shielding plate and is thus unable to be assembled precisely. 
     The present invention has arisen to mitigate and/or obviate the afore-described disadvantages. 
     SUMMARY OF THE INVENTION 
     The major object of the present invention is to provide a shielding plate of lens structure and a lens structure which can reduce a stress from a lens after the lens structure is assembled so as to ensure the shielding plate can be assembled precisely in the lens. 
     To achieve the above and other objects, a shielding plate of lens structure and a lens structure is provided, including: a main body, a center of the main body having a through hole, the main body defining a circle center, the main body being partitioned into at least two larger diameter portions and at least two smaller diameter portions in central angles, the larger diameter portions and the smaller diameter portions being arranged alternatively around the circle center, a distance from an outer edge of each said larger diameter portion to the circle center being greater than a distance from an outer edge of each said smaller diameter portion to the circle center so that a fringe of the main body is non-circular. 
     To achieve the above and other objects, a lens structure is provided, including the shielding plate mentioned above, a lens base and at least one lens. The shielding plate is disposed between the lens base and the lens. 
     Thereby, the shielding plate can reduce a stress from a lens after the lens structure is assembled so as to ensure that the shielding plate can be assembled precisely in the lens. 
     The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment(s) in accordance with the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a stereogram of a shielding plate of a first embodiment of the present invention; 
         FIG. 2  is a front view of other modes of the shielding plate of the first embodiment of the present invention; 
         FIG. 3  is a stereogram of the shielding plate of a second embodiment of the present invention; 
         FIG. 4  is a front view of other modes of the shielding plate of the second embodiment of the present invention; 
         FIG. 5  is a stereogram of the shielding plate of a third embodiment of the present invention; 
         FIG. 6  is a front view of other modes of the shielding plate of the third embodiment of the present invention; 
         FIG. 7  is a perspective breakdown view of a lens structure of the present invention; 
         FIG. 8  is a front view of the lens structure of the present invention; 
         FIG. 9  is a cross-sectional view of the lens structure of the present invention; and 
         FIGS. 10 to 12  are comparison charts showing stress distributions of the shielding plate of the present invention and a conventional shielding plate. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The present invention will be clearer from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment in accordance with the present invention. 
     Please refer to  FIGS. 1, 3 and 5  for a shielding plate of a lens structure of the present invention, including a main body  10 ,  20 ,  30  which may be made of plastic or metal materials, a center of the main body  10 ,  20 ,  30  having a through hole  11 ,  21 ,  31 , the main body  10 ,  20 ,  30  defining a circle center  111 ,  211 ,  311 , the main body  10 ,  20 ,  30  being partitioned into at least two larger diameter portions  12 ,  22 ,  32  and at least two smaller diameter portions  13 ,  23 ,  33  in central angles of the circle center  111 ,  211 ,  311 , the larger diameter portions  12 ,  22 ,  32  and the smaller diameter portions  13 ,  23 ,  33  being arranged alternatively around the circle center  111 ,  211 ,  311 , a distance from an outer edge of each said larger diameter portion  12 ,  22 ,  32  to the circle center  111 ,  211 ,  311  being greater than a distance from an outer edge of each said smaller diameter portion  13 ,  23 ,  33  to the circle center  111 ,  211 ,  311  so that a fringe of the main body  10 ,  20 ,  30  is non-circular. Preferably, each said larger diameter portion  12 ,  22 ,  32  occupies a same central angle, each said larger diameter portion  13 ,  23 ,  33  occupies a same central angle, and the outer edges of each said larger diameter portion  12 ,  22 ,  32  and each said smaller diameter portion  13 ,  23 ,  33  being farthest from the circle center  111 ,  211 ,  311  are curved. 
     Specifically, in a first embodiment, there are respectively four said larger diameter portions  12  and four said smaller diameter portions  13 ; however, as shown in  FIG. 2 , the main body.  10   a ,  10   b ,  10   c ,  10   d ,  10   e ,  10   f ,  10   g  has different numbers of larger diameter portions or smaller diameter portions. Of course, the main body may be in other shapes such as triangular or polygonal but not limited to a multi-petal shape as shown in  FIG. 1 . 
     In addition, please refer to  FIGS. 3 and 4 . In this embodiment, a surface of an inner edge of the through hole  21  of the main body  20 ,  20   a ,  20   b ,  20   c ,  20   d ,  20   e ,  20   f ,  20   g  has a plurality of recesses formed radially outwardly, and the recesses and the surface of the inner edge of the through hole define a plurality of micro-structures  212  which are rugged to decrease diffused light. 
     Furthermore, as shown in  FIGS. 5 and 6 , the main body  30 ,  30   a ,  30   b ,  30   c ,  30   d ,  30   e ,  30   f  defines an axis penetrating through the circle center  311  and perpendicular to the main body  30 ,  30   a ,  30   b ,  30   c ,  30   d ,  30   e ,  30   f , the main body  30 ,  30   a ,  30   b ,  30   c ,  30   d ,  30   e ,  30   f  includes a protrusion  34  around the through hole  31 , and the protrusion  34  protrudes along the axis so that the through hole  31  and the main body  30 ,  30   a ,  30   b ,  30   c ,  30   d ,  30   e ,  30   f  exclusive of the protrusion  34  are on different planes so as to cooperate with a lens which is convex. Preferably, a surface of an inner edge of the through hole  31  of the main body  30 ,  30   a ,  30   b ,  30   c ,  30   d ,  30   e ,  30   f  has a plurality of recesses formed radially outwardly, and the recesses and the surface of the inner edge of the through hole define a plurality of micro-structures  312  which are rugged. 
     Please refer to  FIGS. 7 to 9  for a lens structure, including the shielding plate mentioned above (in this embodiment, the main body  30  in  FIG. 5  is taken as an example), and further including a lens base  40  and at least one lens  50 , the shielding plate is disposed between the lens base  40  and the lens  50 . Specifically, the shielding plate is located between the lens base and a first lens. More specifically, a front end face of the lens base  40  has an opening, a center of the lens  50  has an optical portion, the opening, the through hole and the optical portion correspond to one another, and the larger diameter portions  32  are disposed between the lens base  40  and the lens  50  so as to fix a position of the main body  30 . 
     Please refer to  FIGS. 10 to 12  for actual efficacy of the shielding plate of the present invention. The present invention (the charts on the right side of  FIGS. 10 to 12 ) and a conventional circular shielding plate (the charts on the left side of  FIGS. 10 to 12 ) are experimented under the same conditions to see the stress distributions. A circumference of the conventional circular shielding plate is circular, so the circumference of the shielding plate is squeezed and contacted by the first lens of the lens structure, and the shielding plate receives a relatively greater stress. It can be seen from the charts that the stress of a part near a through hole of the conventional circular shielding plate is obviously greater; and the circumference of the shielding plate of the present invention is cut to form the at least two larger diameter portions, and only the larger diameter portion is squeezed and contacted by the first lens of the lens structure. Therefore, the shielding plate of the present invention receives less stress than the shielding plate of the conventional circular shielding plate, so the shielding plate of the present invention can effectively decrease stress. 
     Given the above, the shielding plate of the present invention can effectively decrease the stress produced when the shielding plate is squeezed by the lens so as to ensure that the lens and elements are precisely assembled and further to elevate an imaging efficacy. 
     While we have shown and described various embodiments in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.