Patent Publication Number: US-2011063722-A1

Title: Stacked disk-shaped optical lens array, stacked lens module and method of manufacturing the same

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to a stacked disk-shaped optical lens array, a stacked lens module and methods of manufacturing the same, especially to a stacked disk-shaped optical lens array formed by stacking at least two disk-shaped optical lens arrays. 
     The resin injection-compression molding technology has been widely applied to various optical produces with high requirements of precision, size and optical properties such as DVD, CD-ROM, or optical lenses. The resin injection-compression molding combines two techniques-injection molding and compression molding. A mold compression process is added into general injection molding processes. That means during the beginning of the resin casting process, the mold is not closed completely. The mold is closed by pressure after part of resin being filled into a mold cavity. The pressure is applied to melt resin material inside the mold cavity through the casting area. The processes are called “closing and clamping mold operations” and the mold cavity filling is finished by compression molding. Compared with injection molding, the residual stress is reduced, the difference in refractive index is decreased, and the optical lens element is with higher accuracy. As shown in US2008/0093756, JP 2008-230005,  JP 2003-071874  etc., optical lens elements are produced by such molding method. 
     Optical lenses have been broadly used in optical systems such as optical lenses of camera phones. While assembling optical lenses or producing optical lenses, a plurality of optical lens elements with different refractions is assembled with certain air spacing for images. Thus optical axis of each optical lens element needs to be aligned precisely so as to prevent reduced resolution. Moreover, there is a certain distance arranged between the optical lens elements. It takes a lot of time and efforts to run processes and precise alignment. Thus the production can&#39;t be boosted and the cost can&#39;t be reduced. Especially the assembling of the optical lens array will influence the optical effects once the optical axis of the optical lens array is not aligned. Thus the alignment of the optical lens array is getting more important and more complicated. JP2001194508 disclosed a method for manufacturing plastic optical lens array. TW M343166 revealed a method for manufacturing glass optical lens array. After production of the optical lens array, it can be cut and divided into a single optical lens element that is used in a lens module. Or the optical lens array is assembled with other optical elements to form a lens submodule array that is divided into a single lens submodule. The lens submodule is assembled with a lens holder, an image capture device or other optical elements to form a lens module. 
     In manufacturing lens module arrays, U.S. Pat. No. 7,183,643, US2007/0070511, WO2008011003 etc revealed a wafer level lens module. Refer to  FIG. 1 , an ordinary optical lens module array includes an aperture  911 , a cover glass  912 , a plurality of optical lens elements and an IR cut lens  917 . As shown in figure, it is a three-piece type optical lens set includes a first optical lens element, a second optical lens element and a third optical lens element  914 ,  915 ,  916 , spaced by a spacer  913 . After assembly, a lens module array is produced and lens modules are generated after cutting the lens module array. Refer to  FIG. 2  and  FIG. 3 , US2006/0044450 disclosed a wafer level lens module  9100 . Each lens substrate  918  is arranged with an optical lens array  914 ,  915  respectively and separated by a spacer  913  so as to form an arrayed optical lens module  900 . Cut the arrayed optical lens module  900  to produce a single optical lens module  9100 . 
     However, while assembling several optical lens arrays for producing lens module arrays, alignment of each optical lens array has effects on resolution of the lens module array. Refer to US2006/0249859, it revealed fiducial marks generated by infrared rays to assemble wafer level lens module. Refer to JP2000-321526, and JP2000-227505, a SELFOC lenses array is produced by assembling of height with cervice. Refer to JP2001-042104, recesses with different depth are used to prevent warpage and deformation of the micro lens array. As to U.S. Pat. No. 7,187,501, cone-shaped projection is used to stack multiple optical lens elements and produce a plastic optical lens array. 
     The optical lens module array used in lens assemblies of LED (light emitting diode) light sources, lens assemblies of solar energy systems, and lens modules of mobile cameras generally includes a plurality of optical lens arrays with different optical surfaces. In conventional plastic optical lens arrays assembled by projections and holes, the plastic optical lens arrays are produced by injection molding, the size of the projections and holes may change due to material shrinkage. Thus the alignment accuracy is difficult to be improved. And the optical axis of each optical lens in the plastic optical lens array is shifted and difficult to be aligned. This results in restrictions on use. 
     A disk-shaped optical lens array produced by resin injection-compression molding and resin casting process through a center of a disk has low inner stress and high accuracy. Moreover, a disk hole arranged at a center of the disk-shaped optical lens array is used for alignment while assembling. Thus an easy method of manufacturing an optical lens module array with high accuracy by the disk-shaped optical lens array is provided. The produced optical lens module array is used in optical lenses of phone cameras, matching requirements of yield rate and production of mass production. 
     SUMMARY OF THE INVENTION 
     Therefore it is a primary object of the present invention to provide a stacked disk-shaped optical lens array applied to optical lenses of optical systems such as camera lenses, mobile phone lenses, or a single LED optical lens. 
     In order to achieve above object, a stacked disk-shaped optical lens array of the present invention includes at least two disk-shaped optical lens arrays stacked and assembled by glue with a preset interval. The disk-shaped optical lens array produced by resin injection-compression molding is a round disk with a disk hole at a center thereof, but not limited to the round shape. The disk-shaped optical lens array includes a first optical surface and a second optical surface, respectively with corresponding optical divisions and non-optical divisions. The optical divisions of the first optical surface and of the second optical surface form a plurality of optical lens elements arranged in an array. At least one glue groove is disposed on a periphery of the non-optical division of at least one disk-shaped optical lens array. After the glue in the glue groove being cured, the two adjacent disk-shaped optical lens arrays are fixed and connected with each other to form a stacked disk-shaped optical lens array. Moreover, at least one alignment fixture is disposed on a periphery of the non-optical division of at least one disk-shaped optical lens array. By the alignment fixture, the two adjacent disk-shaped optical lens arrays are stacked and assembled precisely and optical axis of each optical lens element is aligned. Furthermore, the stacked disk-shaped optical lens array is coated with glue on the non-optical division so as to be assembled with other optical element arrays in a stacked way. The optical element array is an array formed by optical lenses, spacers, apertures, cover glasses, IR-cut glasses etc. After being cut, the stacked disk-shaped optical lens array is divided into a plurality of single stacked optical lens elements. 
     It is another object of the present invention to provide a stacked disk-shaped optical lens array applied to optical lenses of optical systems while the stacked disk-shaped optical lens array includes at least two disk-shaped optical lens arrays fixed and assembled by glue with a present interval. The disk-shaped optical lens array produced by resin injection-compression molding is a round disk with a disk hole at a center thereof, but not limited to the round shape. The disk hole of at least one disk-shaped optical lens array is disposed with a guiding structure by which the two disk-shaped optical lens arrays are stacked and assembled. Moreover, a spacer is arranged between two disk-shaped optical lens arrays to have designed air spacing. The spacer is fixed and assembled with adjacent disk-shaped optical lens array by glue. 
     It is a further object of the present invention to provide a stacked lens module. The stacked lens module consists of at least one stacked optical lens element, a lens holder and at least one optical element. The stacked optical lens element is produced by cutting a stacked disk-shaped optical lens array and dividing a single element from the stacked disk-shaped optical lens array. The optical element includes an optical lens, a spacer, an aperture, a cover glass, an IR-cut glass, etc. 
     It is a further object of the present invention to provide a method of manufacturing a stacked disk-shaped optical lens array and a stacked lens module including following steps:
     S 1 : providing an injection-compression mold having an upper mold and a lower mold respectively with optical molding surfaces; the upper mold and/or the lower mold is disposed with an alignment fixture molding surface respectively and a material inlet is arranged at a center of the upper mold or the lower mold;   S 2 : producing a primary product of a disk-shaped optical lens array by resin injection-compression molding and cutting off a down sprue stick of the primary product of a disk-shaped optical lens array to produce a disk-shaped optical lens array; the disk-shaped optical lens array includes a plurality of optical lens elements formed on optical division while non-optical division of the disk-shaped optical lens array is arranged with glue grooves and alignment fixtures;   S 3 : producing another disk-shaped optical lens array by the above steps and this disk-shaped optical lens array can be without the glue groove;   S 4 : coating glue on the glue groove of two adjacent disk-shaped optical lens arrays and then stack and assemble the two disk-shaped optical lens arrays by guiding structures;   S 5 : aligning optical axes of two adjacent disk-shaped optical lens arrays by the alignment fixtures so that the optical axes are aligned with optical center;   S 6 : curing the glue to form a stacked disk-shaped optical lens array; thereby at least two disk-shaped optical lens arrays are assembled precisely to form a stacked disk-shaped optical lens array whose optical center is aligned precisely;   S 7 : coating non-optical division of the stacked disk-shaped optical lens array with glue for being assembled and stacked with other optical element arrays so as to form a stacked disk-shaped optical lens array with the optical element arrays after curing of the glue;   S 8 : cutting the stacked disk-shaped optical lens array so as to obtain a single stacked optical lens element;   S 9 : mounting the stacked optical lens element into a lens holder to be assembled with other optical elements so as to form a stacked lens module.   

     According to the present method, precise stacked optical lens arrays and stacked lens modules are produced at a time. Thus precise assemblies are obtained and mass production is achieved. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic drawing showing a conventional stacked optical lens array; 
         FIG. 2  is a schematic drawing showing another conventional stacked optical lens array; 
         FIG. 3  is a schematic drawing showing a further conventional stacked optical lens array; 
         FIG. 4  is a schematic drawing showing an embodiment of a disk-shaped optical lens array according to the present invention; 
         FIG. 5  is a schematic drawing showing an embodiment of a disk-shaped optical lens array with alignment pins and alignment cavities according to the present invention; 
         FIG. 6  is a schematic drawing showing an embodiment of a disk-shaped optical lens array with collimating lenses and a guiding notch according to the present invention; 
         FIG. 7  is a schematic drawing showing an embodiment of a disk-shaped optical lens array with reticles, through holes and a guiding angle according to the present invention; 
         FIG. 8  is a schematic drawing showing an embodiment of a disk-shaped optical lens array with glue grooves according to the present invention; 
         FIG. 9  is a schematic drawing showing assembling of an embodiment of a disk-shaped optical lens array according to the present invention; 
         FIG. 10  is a schematic drawing showing a further embodiment of a disk-shaped optical lens array according to the present invention; 
         FIG. 11  is a schematic drawing showing a further embodiment of a disk-shaped optical lens array according to the present invention; 
         FIG. 12  is a schematic drawing showing an embodiment of a disk-shaped optical lens array in which optical axes are aligned by collimating lenses according to the present invention; 
         FIG. 13  is a schematic drawing showing a flow chart of manufacturing a disk-shaped optical lens array and a stacked lens module according to the present invention; 
         FIG. 14  is a schematic drawing showing an embodiment of a stacked lens module according to the present invention; 
         FIG. 15  is a schematic drawing showing another embodiment of a stacked lens module according to the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Refer to  FIG. 10 , a stacked disk-shaped optical lens array  100  of the present invention includes at least two disk-shaped optical lens arrays  1 ,  2  fixed and assembled at a preset interval by glue. The disk-shaped optical lens arrays  1  ( 2 ) is a round disk with a disk hole  13  ( 23 ) on a center thereof produced by resin injection-compression molding, as shown in  FIG. 4 . The disk-shaped optical lens arrays  1  ( 2 ) includes a first optical surface  11  ( 21 ) and a second optical surface  12  ( 22 ), respectively having optical area and non-optical area. The optical area of the first optical surface  11  ( 21 ) and of the second optical surface  12  ( 22 ) are corresponding to each other to form a plurality of optical lens elements  10  ( 20 ) arranged in an array. At least one glue groove  102  is disposed on a periphery of the non-optical area of at least one disk-shaped optical lens array  1  ( 2 ), as shown in  FIG. 8 . After glue  330  filled in the glue groove  102  curing, the two disk-shaped optical lens arrays  1 ,  2  are connected and fixed to form a stacked disk-shaped optical lens array  100 . Moreover, at least one alignment fixture  16  ( 15 ,  17 ,  18 ) is arranged at a peripheral of the non-optical area of at least one disk-shaped optical lens arrays  1  ( 2 ), as shown from  FIG. 5  to  FIG. 7 . The disk-shaped optical lens arrays  1 ,  2  are stacked and assembled precisely by the alignment fixture  16  ( 15 ,  17 ,  18 ) so that an optical axis  101  of each optical lens element  10  are aligned. Furthermore, the shaped of the disk-shaped optical lens array  1 ( 2 ) is not limited, it can be a round disk or a square disk or other shape according to users&#39; need or designs of resin injection-compression molding molds. 
     In order to located the two disk-shaped optical lens arrays  1 ,  2  quickly while stacking and assembling, a guiding structure  191  ( 291 ) is disposed on the disk hole  13  ( 23 ), as a notch structure shown in  FIG. 6 . Or the disk hole  13  ( 23 ) is polygonal and one corner of the disk hole  13  ( 23 ) is cut to use as a guiding structure  191  ( 291 ), as shown as an angle structure in  FIG. 7 . 
     The shape and the type of the glue groove  102  are not limited to round grooves, as shown in  FIG. 8 . Refer from  FIG. 5  to  FIG. 7  the shape and type of the alignment fixture  16 ( 15 - 17 - 18 ) are not limited to an alignment pin  161 , an alignment cavity  162 , a collimating lens  15 , a through hole  17  or a reticle  18  etc. The optical lens element is not restricted in optical lenses, spacers, apertures, cover glasses, infra-red (IR) cur glasses, image capture devices, photoelectric devices, printed circuit boards (PCB) etc. Similarly, the guiding structure is not limited to the guiding notch  191 ( 291 ), the guiding angle  191 ( 291 ), or polygonal hole. 
     Refer to  FIG. 10 , the stacked disk-shaped optical lens array  100  is glued and stacked with other optical element array  3  on the non-optical area. The optical element array  3  is an array formed by optical lenses, spacers, apertures, cover glasses, IR-cut glasses, etc. 
     The stacked disk-shaped optical lens array  100  is singularized into a plurality of single stacked optical lens elements  200  by cutting. 
     Refer to  FIG. 13 , a method of manufacturing a stacked disk-shaped optical lens array of the present invention includes following steps:
     S 1 : providing an injection-compression mold  51  having an upper mold  511  and a lower mold  512  respectively with an upper mold core  513  and a lower mold core  514  as well as corresponding optical molding surfaces so as to form a plurality of optical lens elements  10 ; the upper mold core  513  and/or the lower mold core  514  is disposed with an alignment fixture molding surfaces  5132 ,  5142  respectively and a material inlet  521  is arranged at a center of the upper mold  511  or the lower mold  512 ;   S 2 : producing a primary product of a disk-shaped optical lens array  61  by resin injection-compression molding and cutting off a down sprue stick  614  of the primary product of a disk-shaped optical lens array  61  to produce a disk-shaped optical lens array  1  with a disk hole  13  and a guiding structure  191 ( 192 ); a non-optical area of the disk-shaped optical lens array  1  is arranged with glue grooves and/or alignment fixtures  161 ;   S 3 : producing another disk-shaped optical lens array  2  by the above steps and the disk-shaped optical lens array  2  can be without the glue groove  102 ;   S 4 : coating glue  330  on the glue groove  102  of two adjacent disk-shaped optical lens arrays  1 ,  2  and then stack and assemble the two disk-shaped optical lens arrays  1 ,  2  by guiding structures  191 ( 192 ),  291  ( 292 );   S 5 : aligning optical axes  101  of two adjacent disk-shaped optical lens arrays  1 ,  2  by the corresponding alignment fixtures  161 ( 162 ),  262 ( 261 ) so that each optical lens element  10 ,  20  is aligned with optical center;   S 6 : curing the glue  330  to form a stacked disk-shaped optical lens array  100 ;   S 7 : coating non-optical division of the stacked disk-shaped optical lens array  100  with glue for being assembled and stacked with other optical element arrays  3 ,  313  so as to form a stacked disk-shaped optical lens array  100  with the optical element arrays  3 ,  313  after curing of the glue  330 ;   S 8 : cutting and dividing the stacked disk-shaped optical lens array  100  to get a single stacked optical lens element  200 ;   

     A method of manufacturing a stacked lens module consists of following steps:
     SS 1 : producing a stacked disk-shaped optical lens array  100  by the step S 1  to S 6  for manufacturing the stacked disk-shaped optical lens array mentioned above;   SS 2 : cutting the stacked disk-shaped optical lens array  100  to get a single stacked optical lens elements  200 ;   SS 3 : mounting the stacked optical lens elements  200  into a lens holder  301  and assembled with required optical elements such as cover glasses  311 , apertures  312 , spacers  313 , IR cut glasses  314 , and circuit boards  3  with image capture devices  30  so as to form a stacked lens module  300 , as shown in  FIG. 14 .   

     Embodiment 1  
     Refer to  FIG. 5 ,  FIG. 8 ,  FIG. 9 ,  FIG. 10 ,  FIG. 13 , this embodiment is a stacked disk-shaped optical lens array  100  with an alignment fixture  16 , having a first and a second disk-shaped optical lens arrays  1 ,  2 . A primary product  61  of disk-shaped optical lens arrays is produced by a resin injection-compression molding and then a down sprue stick  614  of the primary product  61  is cut off to form a central disk hole  13  ( 23 ). Thus the first and the second disk-shaped optical lens arrays  1 ,  2  are formed. 
     The first disk-shaped optical lens array  1  is a round disk with a diameter of 120 mm, having a disk hole  13  on a center thereof, a first and a second optical surfaces  11 ,  12  with corresponding 244 optical divisions arranged at equal intervals in an array respectively. The diameter of the disk hole  13  is 30 mm. Each optical division forms a meniscus optical lens element  10 . Non-optical division on a peripheral of each optical lens element  10  is disposed with a glue groove  102 , as shown in  FIG. 8 . Moreover, Non-optical division on a peripheral of the first disk-shaped optical lens array  1  is disposed with two alignment pins  161  and two alignment cavities  162  respectively separated by 90 degrees (one-quarter of a cycle) and used as alignment fixtures. The alignment pins  161  and the alignment cavities  162  are parallel to the optical axes  101  and located on preset positions, as shown in  FIG. 5 . In different embodiments, the alignment pin  161  and the alignment cavity  162  can be other types or arranged at different positions. 
     The second disk-shaped optical lens array  2  is produced by the same method and having  244  meniscus optical lens elements  10  corresponding to the optical lens elements  10  of the first disk-shaped optical lens array  1 . The second disk-shaped optical lens array  2  can be without the glue groove  102 . Moreover, its non-optical division on the peripheral is arranged with two alignment cavities  262  and two alignment pins  261  as alignment fixtures, respectively corresponding to the alignment pins  161  and the alignment cavities  162  of the first disk-shaped optical lens array  1 . 
     Refer to the steps S 4 , S 5 , and S 6 , while stacking and assembling the first disk-shaped optical lens array  1  and the second disk-shaped optical lens array  2 , use a dispensing system (glue dispenser) to coat glue  330  over the glue groove  102  of the first disk-shaped optical lens array  1 . The materials of the glue  330  are not limited but thermosetting glue or UV glue is preferred for optical systems. In this embodiment, thermosetting glue is used. Then by the alignment fixtures between the two disk-shaped optical lens arrays  1 ,  2  connecting with each other such as the alignment pins  161  and the alignment cavities connecting with the corresponding alignment cavities  262  and the alignment pins  261  respectively, the optical axis  101 ,  201  of each optical lens element  10 ,  20  are aligned after being stacked and assembled so as to form a stacked disk-shaped optical lens array  100  having two sets of 244 meniscus optical lens elements  10 ,  20  assembled precisely. 
     Refer to  FIG. 10 , the stacked disk-shaped optical lens array  100  is further stacked with an optical element array  3 . In this embodiment, an optical lens array  100  consists of the stacked optical lens array ( 100 ) formed by the first and the second disk-shaped optical lens arrays  1 ,  2 , an optical element array  3  and a spacer array  313 . The optical element array  3  is formed by a number of 244 optical elements  30  (such as image capture devices  30 ) arranged in an array and located on a disk-shaped substrate (such as a circuit board). Each optical element  30  is corresponding to each optical lens element  10 ,  20 . The spacer array  313  is produced by an opaque plastic plate with a certain thickness and having 244 through holes. The spacer array  313  keeps designed air spacing between the optical lens element  20  and the optical element  30 . While being stacked and assembled, the first and the second disk-shaped optical lens arrays  1 ,  2  are firstly stacked to form a stacked disk-shaped optical lens array ( 100 ). Then coat glue  330  on two surfaces of the spacer array  313  or coat glue  330  on a surface of the stacked disk-shaped optical lens array and a surface of the optical element array  3  that are facing each other. Then the stacked disk-shaped optical lens array, the spacer array  313  and the optical element array  3  are stacked in turn. The optical element array  3  and the optical axis  101  are aligned. After the glue  330  being cured in an oven, a stacked disk-shaped optical lens array  100  with 244 optical lenses is produced. 
     Refer to  FIG. 9 , another stacking way of the embodiment is revealed. The non-optical division of the optical element array  3  is disposed with four alignment pins  361  used as alignment fixtures while the first and the second disk-shaped optical lens array  1 ,  2  respectively is arranged with a guiding structure  191 ,  291 . As shown in  FIG. 6 , a guiding structure  191  in the form of a guiding notch is disclosed. The disk hole  13  ( 23 ) and the guiding structure  191  ( 291 ) are formed by cutting the down sprue stick  614  of the primary product  61  of disk-shaped optical lens arrays. The diameter of the disk hole  13  ( 23 ) is 30 mm and the distance from an apex angle to the periphery of the disk hole  13  ( 23 ) is 0.8 mm. The second disk-shaped optical lens array  2  is disposed with four alignment cavities  262  used as alignment fixtures that are corresponding to and assembled with the alignment pins  361  of the optical element array  3 . Moreover, the height of the alignment pin  361  is pre-designed so that designed air spacing between each optical lens element  20  of the second disk-shaped optical lens array  2  and each image capture device  30  of the optical element array  3  is maintained after the alignment pins  361  being assembled with the alignment cavities  262 . 
     Refer to  FIG. 9 , while stacking and assembling, the non-optical divisions of the first and the second disk-shaped optical lens arrays  1 ,  2  and the optical element array  3  are coated with glue  330  and then are set into an assembly fixture  55 . The assembly fixture  55  is disposed with a disk-hole assembly pole  551  which is with a disk-hole alignment cam  552  so as to correspond and assemble with the guiding structure  191 ( 291 - 391 ) of the disk hole  13 ( 23 - 33 ) of the optical element array  3 . By the disk-hole assembly pole  551  and the disk-hole alignment cam  552  of the assembly fixture  55 , the first and the second disk-shaped optical lens arrays  1 ,  2  and the optical element array  3  are initially aligned along a disk hole guiding line  104  and this favors following precise alignment. Thus the assembling time is shortened and the assembling efficiency is improved. 
     For precise alignment, the first and the second disk-shaped optical lens arrays  1 ,  2  and the optical element array  3  are aligned and assembled by alignment fixtures  162 ,  261 ,  262 ,  361  so that optical axes  101  of each optical lens element  10 ,  20  and each image capture device  30  are aligned. After the glue  330  being cured in an oven, a stacked disk-shaped optical lens array  100  with  244  optical lens elements is produced. 
     Embodiment 2  
     Refer to  FIG. 6 ,  FIG. 12 , a stacked disk-shaped optical lens array  100  of this embodiment includes an alignment fixture  15 ( 25 ) that is a collimating lens, a disk hole  13 ( 23 ) arranged with a guiding structure  191  ( 291 ) (guiding notch), a first disk-shaped optical lens array  1  and a second disk-shaped optical lens array  2 . 
     The first and the second disk-shaped optical lens arrays  1 ,  2  produced by the same method in the embodiment one respectively include 249 meniscus lens elements  10  and 249 bi-convex lens elements  20  arranged at equal intervals and the optical lens elements  10 ,  20  are corresponding to each other. The optical axes  101 ,  201  of the optical lens elements  10 ,  20  are aligned and arranged with an equal interval. 
     The first and the second disk-shaped optical lens arrays  1 ,  2  are round disks with a diameter of  120 mm, each having a disk hole  13 ,  23  on a center thereof, and a notch-type guiding structure  191 ,  291 . The disk hole  13 ,  23  and the guiding structure  191 ,  291  are formed by removing a down sprue stick  614  from a primary product of a disk-shaped optical lens array  61 . The diameter of the disk hole  13 ,  23  is 30 mm and the distance between the apex angle of the guiding structure  191 ,  291  and the peripheral of the disk hole  13 ,  23  is 0.8 mm. Moreover, non-optical division on the peripheral of each optical lens element  10 ,  20  is arranged with a glue groove  102 ,  202 . Three collimating lens type alignment fixtures  15  such as a bi-convex or plano-convex spherical lens element are arranged at 120 degrees around the periphery of the disk-shaped optical lens array. When laser beam passes through the collimating lens ( 15 ), it becomes a light beam parallel to the optical axis for calibration. A spacer array  313  is arranged between the first and the second disk-shaped optical lens arrays  1 ,  2  so as to have designed air spacing between each optical lens element  10  and each optical lens element  20 . 
     While assembling and stacking, the glue grooves  102 ,  202  of the first and the second disk-shaped optical lens arrays  1 ,  2  are coated with glue  330  such as UV glue. Then the first disk-shaped optical lens array  1 , the spacer array  313  and the second disk-shaped optical lens array  2  are put into an assembly fixture  55  for initial alignment as shown in  FIG. 9 . The first and the second disk-shaped optical lens arrays  1 ,  2  and the optical element array  3  are initially aligned along a disk hole guiding line  104  by the disk-hole assembly pole  551  and the disk-hole alignment cam  552  of the assembly fixture  55 . 
     For precise alignment, refer to  FIG. 12 , a laser alignment system  57  emits a laser beam  571  passing through the collimating lens type alignment fixtures  15 ,  25  of the first and the second disk-shaped optical lens arrays  1 ,  2 . Then adjust the first and the second disk-shaped optical lens arrays  1 ,  2  so as to make optical axes  101 ,  201  of each optical lens element  10 ,  20  align with each other. That means align with the optical axis  101 . Then the glue  330  is cured under UV radiation. After being removed from the assembly fixture  55 , a stacked disk-shaped optical lens array  100  with 249 optical lens sets is produced. The optical lens set includes a meniscus lens element, a spacer, and a bi-convex lens element assembled precisely. 
     Embodiment 3 
     Refer to  FIG. 7  and  FIG. 11 , this embodiment is a stacked disk-shaped optical lens array  100  that includes an alignment through hole  17 ( 27 ), a disk hole  13  ( 23 ) with a guiding structure  192 , 292  (guiding angle), a first disk-shaped optical lens array  1 , and a second disk-shaped optical lens array  2 . 
     The first and the second disk-shaped optical lens arrays  1 ,  2  are produced by the same method mentioned in the embodiment one and embodiment two. A disk hole  13 ,  23  thereof is a square with a guiding structure  191 ,  291  that is a guiding angle and is formed by punching a down sprue stick  614  of a primary product of a disk-shaped optical lens array  61 . Moreover, non-optical division of the first disk-shaped optical lens array  1  and of the second disk-shaped optical lens array  2  is arranged with at least one alignment through hole  17 ( 27 ) corresponding to each other and used as alignment fixtures. In  FIG. 7 , the two alignment through holes  17 ( 27 ) are disposed at 90 degrees around the peripheral of the disk-shaped optical lens array but not limited. Refer to  FIG. 11 , the two alignment through holes  17 ( 27 ) are arranged at 180 degrees around the peripheral of the disk-shaped optical lens array. 
     While assembling and stacking, the glue groove  202  of the second disk-shaped optical lens array  2  is coated with glue  330  such as thermosetting glue (but not limited to). Then the first disk-shaped optical lens array  1  and the second disk-shaped optical lens array  2  are put into an assembly fixture  55  for initial alignment. The assembly fixture  55  is arranged with a disk-hole assembly pole  551  whose shape and position are corresponding to those of the guiding angle ( 192 , 292 ) of the disk hole  13 ,  23 . Thus the first and the second disk-shaped optical lens arrays  1 ,  2  are initially aligned along a disk hole guiding line  104  by the disk-hole assembly pole  551  of the assembly fixture  55 . Then by two alignment poles  553  of the assembly fixture  55  respectively being inserted into the alignment through holes  17 ,  27  of the e first and the second disk-shaped optical lens arrays  1 ,  2 , optical axes of each lens element  10 ,  20  are aligned with each other, aligned with the optical axis  101 . After the glue  330  being cured in an oven, a stacked disk-shaped optical lens array  100  is removed from the assembly fixture  55  and produced. By such precise alignment, stacking and assembling, the assembly time is reduced and the assembling efficiency is improved. 
     Embodiment 4 
     Refer to  FIG. 7 , this embodiment is a stacked disk-shaped optical lens array  100  that includes a reticle  18 ( 28 ) as alignment fixture, a disk hole  13  ( 23 ) with a guiding structure  192 , 292  (guiding angle), a first disk-shaped optical lens array  1 , and a second disk-shaped optical lens array  2 . 
     The first and the second disk-shaped optical lens arrays  1 ,  2  are produced by the same method mentioned in the embodiment three. The difference between this embodiment and the above one is in that the non-optical divisions of the first and the second disk-shaped optical lens arrays  1 ,  2  are respectively are disposed with reticles  18 ( 28 ) used as alignment fixture. The reticle  18 ( 28 ) is formed by hair lines and the two reticles  18 ( 28 ) of this embodiment can be, but not limited to, arranged at 90 degrees around the periphery of the disk-shaped optical lens array  1 ( 2 ). 
     While assembling and stacking, similar to the embodiment three, initial alignment is achieved by the disk hole  13 ( 23 ) and the guiding angle  192  ( 292 ). For precise alignment (refer to the embodiment two and  FIG. 12 ), a laser alignment system  57  is used to emit a laser beam  571  passing through the reticles  18 ,  28 . Then adjust the first and the second disk-shaped optical lens arrays  1 ,  2  so as to make optical axes  101 ,  201  of each optical lens element  10 ,  20  align with each other. That means align with the optical axis  101 . After curing of the glue  330  and being removed from the assembly fixture  55 , a stacked disk-shaped optical lens array  100  that are assembled precisely is obtained. 
     Embodiment 5  
     Refer to  FIG. 14 , this embodiment is a high-precision stacked lens module  300  used in small-sized mobile phones with cameras. A stacked disk-shaped optical lens array  100  is cut into a plurality of stacked optical lens elements  200  that is assembled with other optical elements and a lens holder so as to form the stacked lens module  300 . The stacked lens module  300  consists of a stacked optical lens element  200 , a lens holder  301  and other optical elements. In this embodiment the optical elements include a cover glass  311 , an aperture  312 , two spacers  313 , an IR cut glass  314 , and an image capture device  30  set on a circuit board  3 . 
     The manufacturing processes of this embodiment are similar to those of the above embodiments. Firstly, produce a stacked disk-shaped optical lens array  100  that are assembled precisely and having a first and a second disk-shaped optical lens arrays  1 ,  2  glued and fixed by glue  330 . The first and the second disk-shaped optical lens arrays  1 ,  2  respectively have 249 meniscus lens elements  10 ,  20  as the embodiment two. By the guiding structure and the alignment structure mentioned in above embodiments, optical axes  101 ,  201  of each lens elements  10 ,  20  are aligned and assembled precisely. After being cut and divided, 248 stacked optical lens elements  200  are produced (one is unable to be used due to under-size of the periphery), each having two meniscus lens elements  10 ,  20  aligned with the optical axis  101 . 
     While assembling, the cover glass  311  is mounted into the lens holder  301  firstly. The aperture  312  is glued with the stacked optical lens element  200  and then set into the lens holder  301 . For keeping designed air spacing between the IR cut glass  314  and the optical lens element  20 , a first spacer  313  is disposed between the stacked optical lens element  200  and the IR cut glass  314 . The image capture device  30  is preset on a circuit board  3   a.  In order to have designed air spacing between the IR cut glass  314  and the image capture device  30 , a second spacer  313  is arranged between the IR cut glass  314  and the image capture device  30 . By threads between the second spacer  313  and the lens holder  301 , the above-mentioned optical elements are fixed. Lastly the image capture device  30  and the circuit board  3   a  are glued and fixed in the lens holder  301  to produce a stacked lens module  300 . The structure of the stacked lens module  300  and the manufacturing method thereof overcomes shortcomings of conventional techniques during which each optical element needs to be adjusted, calibrated and assembled by optical instruments. Moreover, the difficulties in increasing lens resolution due to alignment of optical axes are also reduced. 
     Furthermore, for cost down and mass production, the stacked lens module  300  of this embodiment can be assembled in another way. As embodiment one, each optical element is produced in an array form such as disk-shaped aperture array, disk-shaped first spacer array, disk-shaped IR cut glass array etc. A plurality of disk-shaped optical element arrays is produced firstly. The disk-shaped optical element arrays are assembled and stacked precisely with the stacked disk-shaped optical lens array  100  of the present invention to form a stacked lens sub-module array. Then the stacked lens sub-module array is cut and divided into several stacked optical lens elements  200  with optical elements, as the embodiment one and the embodiment shown in  FIG. 10 . The sub-module is mounted into the lens holder  301  at a time to form a stacked lens module  300 . The disk-shaped aperture array is formed by 252 opaque plastic plates with through holes. The disk-shaped first spacer array includes 252 opaque plastic plates with preset thickness and through holes. The disk-shaped IR cut glass array is formed by cutting a whole IR filter plate into disk-shaped. 
     Embodiment 6 
     Refer to  FIG. 15 , this embodiment is a stacked lens module  300  applied to zoom lenses of cameras. In order to provide zooming capability, different optical lens elements are assembled into an optical lens group. The zooming effect is achieved by changing the distance between two optical lens groups. In this embodiment, the stacked lens module  300  is composed of a first optical lens group  31  and a second optical lens group  32 . The first optical lens group  31  includes a stacked optical lens element  200 , a lens holder  301  and several optical elements. The stacked optical lens element  200  is formed by two optical lens elements  10 ,  20  while the optical elements include a cover glass  311 , an aperture  312  and spacers  313  for fixing each optical element and the lens holder  301 . The second optical lens group  32  includes a third plastic lens element  60 , a lens holder  302  and several optical elements having two spacers  313 , one IR cut glass  314 , one image capture device  30  and one circuit board  3   a.    
     The method of manufacturing this embodiment is the same as the one mentioned in the above four embodiments. At first, a stacked optical lens element  200  including two optical lens elements  10 ,  20  and glue grooves  102  is produced. Then mount a cover glass  311 , an aperture  312 , the stacked optical lens element  200  into a lens holder  301  to form a first optical lens group  31 . A third plastic lens element  60  and a lens holder  302  are also prepared. Next the third plastic lens element  60 , a spacer  313 , an IR cut glass  314  and another spacer  313  is assembled into the lens holder  302  in turn. A circuit board  3   a  set with an image capture device  30  is assembled onto the lens holder  302  so as to form a second optical lens group  32 . 
     In use, the first optical lens group  31  is mounted into a lens barrel (not shown in figure). By movement of the first optical lens group  31 , the distance between the optical lens groups varies so as to achieve zooming effect. Thereby the stacked lens module  300  is produced easily and quickly. By virtue of mass production, the cost is reduced dramatically. 
     Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details, and representative devices shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.