CN103185942A - Camera lens module - Google Patents

Abstract

The present invention provides a lens module, which includes an image sensing module and a voice coil motor fixed on the image sensing module; The first coil group and the second coil group for focusing; the image sensing module includes a base and an elastic element, and the base includes an upper surface and a lower surface opposite to the upper surface; A groove is opened on the upper surface, and an elastic element is arranged in the groove, and one end of the elastic element protrudes from the upper surface; the lower cover is pressed against the upper surface of the seat body and the elastic element superior. By ensuring the alignment accuracy of the voice coil motor and the image sensor module during the assembly process, and by fixing the first coil group on the movable barrel to compensate the shake of the lens module during operation, the imaging of the lens module is effectively improved quality.

Description

Lens module

technical field

The invention relates to an image taking device, in particular to a lens module.

Background technique

The lens module generally includes a lens, a voice coil motor and an image sensing module. The voice coil motor is fixed above the image sensing module, and the lens is movably accommodated in the voice coil motor. The voice coil motor drives the lens to move relative to the image sensing module to achieve focusing.

However, when the lens module is used to shoot images, the shake of the photographer will cause the image to be blurred. Traditional anti-shake devices compensate for shaking by moving the image sensor in the image sensor module, but the structure of the traditional anti-shake device is complicated, and it is independent of the focusing structure of the voice coil motor, so that the cost is relatively high. high.

In addition, since the voice coil motor is directly carried on the image sensing module, if the voice coil motor is inclined relative to the image sensing module, it is difficult to adjust the inclination of the voice coil motor relative to the image sensing module during the assembly process. As a result, the optical axes between the voice coil motor and the image sensing module are not on the same straight line, thereby affecting the imaging quality of the image sensing module.

Contents of the invention

In view of this, it is necessary to provide a lens module that has a simple structure and can improve imaging quality.

A lens module, which includes an image sensing module and a voice coil motor fixed on the image sensing module; the voice coil motor has an optical axis and includes a housing and a movable barrel , a magnetic assembly, a first coil group, a second coil group, a first elastic piece, and a lower cover; the housing includes an upper cover and a side wall fixed on the edge of the upper cover, and the upper cover and the side The wall forms an accommodating space; the movable cylinder is accommodated in the accommodating space; the magnetic assembly includes a plurality of magnetic groups, and the multiple magnetic groups surround the movable cylinder and are fixed in the accommodating space; The lower cover is fixed on the end of the side wall away from the upper cover; the first elastic piece is connected between the upper cover and the movable barrel or between the lower cover and the movable barrel, so that the movable barrel can be relatively The housing moves; the first coil group includes multiple pairs of ring-shaped first coils, each pair of first coils is arranged oppositely and fixed on the movable cylinder, and the first coil group is used to communicate with The magnetic assembly cooperates to drive the movable barrel to deflect on a plane perpendicular to the optical axis to achieve anti-shake; the second coil group is in the shape of a ring, which is sleeved on the movable barrel, so that The second coil group is used to cooperate with the magnetic assembly to drive the movable cylinder to move up and down along the optical axis to achieve focusing; the image sensing module includes a base and an elastic element; the base It includes an upper surface and a lower surface opposite to the upper surface; a groove is opened on the upper surface, and the elastic element is fixed in the groove; the lower cover is carried on the upper surface and is connected with the The elastic element is pressed against each other, and the image sensing module and the voice coil motor are on the same optical axis by pressing the elastic element.

The lens module provided by the present invention can adjust the inclination of the voice coil motor relative to the mirror image sensing module by arranging elastic elements on the base to press the edge of the voice coil motor against the image sensing module during the assembly process. The voice coil motor is fixed to ensure the alignment accuracy of the voice coil motor and the image sensing module. In addition, the magnetic component is used to drive the first coil relatively arranged on the movable barrel, which effectively compensates the shaking during the working process of the lens module, thereby improving the imaging quality of the lens module.

Description of drawings

FIG. 1 is an exploded schematic diagram of a lens module provided by an embodiment of the present invention.

FIG. 2 is an exploded view of the lens module in FIG. 1 along another viewing angle.

FIG. 3 is a schematic perspective view of a voice coil motor in the lens module in FIG. 1 .

FIG. 4 is a schematic perspective view of an image sensing module in the lens module in FIG. 1 .

FIG. 5 is a schematic perspective view of the lens module in FIG. 1 .

FIG. 6 is a cross-sectional view of the lens module in FIG. 5 along line VI-VI.

Description of main component symbols

Lens module 100 voice coil motor 20 case twenty one cover 211 side wall 212 Accommodating space 213 first via 214 Activity canister twenty two first cylindrical part 221 upper face 2211 first outer surface 2212 first connection block 2213 positioning block 2214 first storage tank 2215 second cylindrical part 222 bottom face 2221 second outer surface 2222 second connection block 2223 baffle 223 magnetic assembly twenty three Magnetic group 231 first magnet 232 second magnet 233 first magnetic surface 234 second magnetic surface 235 first coil group twenty four first coil 241 second coil set 25 first shrapnel 26 First Outer Ring 261 First Inner Ring 262 first connection 263 first connection hole 264 lower lid 27 first surface 271 second surface 272 Second via 273 first connecting column 274 guide hole 275 second shrapnel 28 Second outer ring 281 Second inner circle 282 second connection 283 Second connection hole 284 third connecting hole 285 Image sensor module 40 Body 41 upper surface 411 Second storage tank 4111 lower surface 412 first plane 413 second plane 414 groove 415 guide block 416 image sensor 42 elastic element 43 raised 431

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

Detailed ways

As shown in FIGS. 1-2 , a lens module 100 provided in an embodiment of the present invention has an optical axis L. As shown in FIG. The lens module 100 includes a voice coil motor 20 and an image sensing module 40 , and the voice coil motor 20 is fixed above the image sensing module 40 . A lens (not shown in the figure) is fixed in the voice coil motor 20, and the voice coil motor 20 drives the lens to deflect on a plane perpendicular to the optical axis L or move along the direction of the optical axis L compared with the image sensing module 40 , so as to realize shake compensation and focus of the lens module 100 . Establish a three-dimensional coordinate system with the optical axis L as the Z axis and the plane perpendicular to the optical axis L as the XY plane.

The voice coil motor 20 includes a housing 21, a movable barrel 22, a magnetic assembly 23, a first coil set 24, a second coil set 25, a first elastic piece 26, a lower cover 27 and a second Shrapnel 28.

The casing 21 includes a top cover 211 and a side wall 212 vertically fixed on the edge of the top cover 211 . The upper cover 211 and the side wall 212 form an accommodating space 213 . A first through hole 214 is defined near the center of the upper cover 211 . In this embodiment, the housing 21 is in the shape of a cube, and the side wall 212 is composed of four flat plates connected end to end.

The movable barrel 22 is in the shape of an octagonal prism, and is accommodated in the accommodating space 213 for accommodating the lens. The movable barrel 22 includes a first cylindrical portion 221 , a second cylindrical portion 222 and a baffle 223 disposed between the first cylindrical portion 221 and the second cylindrical portion 222 . The cross-sectional area of the baffle plate 223 is larger than the cross-sectional area of the first cylindrical portion 221 and the second cylindrical portion 222 respectively. The first cylindrical portion 221 includes an upper end surface 2211 and a first outer surface 2212 . The second cylindrical portion 222 includes a lower end surface 2221 and a second outer surface 2222 . The movable barrel 22 defines a lens hole 224 penetrating through the opposite upper end surface 2211 and lower end surface 2221 . A plurality of first connecting blocks 2213 vertically extend upwards at even intervals on the upper end surface 2211 . A plurality of positioning blocks 2214 vertically extend from the position of the first outer surface 2212 close to the upper end surface 2211 along the circumferential direction at uniform intervals. In this embodiment, the first outer surface 2212 is formed by connecting eight planes, the number of the positioning blocks 2214 is four and there is a plane between two adjacent positioning blocks 2214, two of them The orientation of the opposing positioning blocks 2214 is perpendicular to the orientations of the other two opposing positioning blocks 2214, and the orientations of the two sets of positioning blocks 2214 are respectively perpendicular to the X axis and the Y axis of the three-dimensional coordinate system. A first accommodating groove 2215 is defined along a circumferential direction of the first outer surface 2212 near the baffle plate 223 . A plurality of second connection blocks 2223 are evenly spaced from the second outer surface 2222 along the circumferential direction. In this embodiment, the number of the first connecting blocks 2213 and the second connecting blocks 2223 are both four.

The magnetic component 23 is accommodated in the accommodating space 213 , which includes a plurality of triangular prism-shaped magnetic groups 231 . In this embodiment, the number of the magnetic groups 231 is four, and the four magnetic groups 231 are respectively fixed at the corners of the casing 21 . The magnetic assembly 231 is fixed to the side wall 212 of the housing 21 by colloid. Each magnetic group 231 includes a first magnet 232 and a second magnet 233 stacked on the first magnet 232 . The first magnet 232 includes a first magnetic surface 234 facing the optical axis L, the second magnet 233 includes a second magnetic surface 235 facing the optical axis L, and the first magnetic surface 234 and the second magnetic surface 235 has distinct magnetic poles. In this embodiment, the first magnetic surface 234 is an S pole, and the second magnetic surface 235 is an N pole. It can be understood that the first magnet 232 and the second magnet 233 can be designed in other shapes according to the size of the inner space of the housing 21 .

The first coil group 24 includes a plurality of annular first coils 241 , and every two first coils 241 form a pair of first coils 241 . Each of the first coils 241 includes a positioning hole 242, and the first coil 241 is clamped on the first outer surface 2212 of the movable barrel 22 through the corresponding positioning hole 242 and the positioning block 2214, and each pair of The first coils 241 are oppositely arranged. Each of the first coils 241 includes two parallel parts, and when a current is passed through the first coil 241 , the directions of the currents in the two parallel parts are opposite. In this embodiment, the first coil group 24 includes two pairs of first coils 241, wherein the direction of one pair of first coils 241 is perpendicular to the direction of the other pair of first coils 241, and the two pairs of first coils 241 are respectively perpendicular to On the X-axis and Y-axis of the three-dimensional coordinate system.

The second coil group 25 is annular and accommodated in the first accommodation groove 2215 of the movable barrel 22 . The second coil group 25 is spaced apart from the first coil group 24 , and current can be passed through the first coil group 24 and the second coil group 25 in time-sharing or simultaneously.

The first elastic piece 26 is flat and fixed between the upper cover 211 and the movable barrel 22 . The first elastic piece 26 includes a first outer ring portion 261 , a first inner ring portion 262 and a first connection portion 263 connected between the first outer ring portion 261 and the first inner ring portion 262 . The first outer ring part 261 is fixed on the bottom surface of the upper cover 211 through colloid connection. A plurality of first connection holes 264 are opened on the first inner ring portion 262 , and the first connection block 2213 of the movable cartridge 22 is accommodated in the first connection holes 264 and fixed by glue. In this embodiment, the number of the first connecting holes 264 is four.

The lower cover 27 is in the shape of a cube and includes a first surface 271 and a second surface 272 opposite to the first surface 271 . The lower cover 27 defines a second through hole 273 passing through the first surface 271 and the second surface 272 . A plurality of first connecting posts 274 vertically extend from the first surface 271 near the corner, and a guide hole 275 is defined on the second surface 272 . In this embodiment, the guide hole 275 is a blind hole and has a hemispherical shape. In this embodiment, the number of the first connecting columns 274 is four.

The second elastic piece 28 is flat and fixed between the lower cover 27 and the movable barrel 22 . The second elastic piece 28 includes a second outer ring portion 281 , a second inner ring portion 282 and a second connecting portion 283 connected between the second outer ring portion 281 and the second inner ring portion 282 . A plurality of second connection holes 284 are opened near the corners of the second outer ring portion 281, and the first connection posts 274 of the lower cover 27 are accommodated in the second connection holes 284 and fixed by glue. . A plurality of third connecting holes 285 are opened on the second inner ring part 282 , and the second connecting blocks 2223 of the movable cartridge 22 are accommodated in the third connecting holes 285 and fixed by glue. In this embodiment, the number of the second connecting holes 284 and the third connecting holes 285 are both four.

It can be understood that, in order to further reduce the cost of the lens module 100, the voice coil motor 20 may only include the first elastic piece 26 or the second elastic piece 28, and the first elastic piece 26 or the second elastic piece 28 may be optionally fixed on the upper cover 211 and between the movable barrel 22 or between the lower cover 27 and the movable barrel 22.

As shown in FIG. 3 , during the assembly process of the voice coil motor 20 , the first outer ring portion 261 of the first elastic piece 26 is first fixed to the housing 21 , and then the magnetic assembly 23 is placed in the accommodating space. 213 and fixed at the corner of the housing 21. Then, the first coil group 24 and the second coil group 25 are respectively fixed on the movable barrel 22, and then the assembled movable barrel 22 is placed in the accommodating space 213, and the first inner part of the first elastic piece 26 The ring portion 262 is elastically connected to the movable cylinder 22 , so that the magnetic assembly 23 surrounds the movable cylinder 22 . The part of each first coil 241 close to the lower cover 27 is opposite to the first magnetic surface 234, the part of the first coil 241 close to the upper cover 211 is opposite to the second magnetic surface 235, and the second coil group 25 is opposite to the second magnetic surface 235. The first magnetic surfaces 234 are opposite to each other. Finally, the second inner ring portion 282 of the second elastic piece 28 is fixed to the movable barrel 22, and the lower cover 27 is fixed on one end of the housing 21 by colloid, so that the second outer ring portion of the second elastic piece 28 281 is fixed with the lower cover 27. The movable cylinder 22 is suspended in the accommodating space 213 through the connection of the first elastic piece 26 and the second elastic piece 28, and the movable cylinder 22 can move relative to the housing 21 in the direction of the optical axis L and in the direction perpendicular to the optical axis. deflection in the plane of L. In the initial state, the optical axes L of the first through hole 214 , the lens hole 224 and the second through hole 273 are on the same straight line.

During the operation of the voice coil motor 20, since the part of the first coil 241 close to the upper cover 211 and the part close to the lower cover 27 respectively face two magnetic fields with different polarities, when the two directions are perpendicular to the X-axis One of the first coils 241 is supplied with a positive current (in the clockwise direction), and the first coil 241 is subjected to an upward Lorentz force along the optical axis L; at the same time, the other first coil 241 is directed perpendicular to the X axis 241 is passed a negative current (in the counterclockwise direction), and the first coil 241 is subjected to an upward Lorentz force along the optical axis L; thus, the movable barrel 22 is deflected around the X axis. Similarly, when the two first coils 241 oriented perpendicular to the Y-axis are respectively supplied with a positive current and a negative current, the movable drum 22 is deflected around the Y-axis. Due to the deflection of the movable barrel 22 in the direction of the X-axis or the direction of the Y-axis, the error of the lens module 100 caused by shaking on the XY plane can be compensated. Since the second coil group 25 is located in the magnetic field of the same polarity, when the second coil group 25 is passed through a positive current or a negative current, the second coil group 25 is subjected to a downward or downward Loren At this point, the movable barrel 22 moves downward or upward along the Z-axis direction, so as to achieve focusing.

As shown in FIG. 4 , the image sensing module 40 includes a base 41 , an image sensor 42 and an elastic element 43 . The seat body 41 is in the shape of a cube and includes an upper surface 411 and a lower surface 412 opposite to the upper surface 411 . A second accommodating groove 4111 is defined near the center of the upper surface 411 , and the shape of the second accommodating groove 4111 corresponds to the image sensor 42 . The upper surface 411 is divided into a first plane 413 and a second plane 414 . The vertical distance between the first plane 413 and the lower surface 412 is no less than the vertical distance between the second plane 414 and the lower surface 412 . In this embodiment, the first plane 413 and the second plane 414 are respectively close to two opposite edges of the seat body 41 , and the upper surface 411 and the lower surface 412 form an edge close to the first plane 413 angle. A groove 415 is defined on the second plane 414 , and the groove 415 communicates with the second receiving groove 4111 . The elastic element 43 is disposed in the groove 415, one end of the elastic element 43 protrudes from the second plane 414, and the end of the elastic element 43 protruding from the second plane 414 and the lower surface 412 The vertical distance is greater than the vertical distance between the first plane 413 and the lower surface 412 . In this embodiment, the elastic element 43 is in the shape of a bar, and after the elastic element 43 is stamped and formed, a protrusion 431 protrudes upward from the middle position of the elastic element 43, and the protrusion 431 protrudes from the second plane 414 and is in line with the The vertical distance between the lower surfaces 412 is larger than the vertical distance between the first plane 413 and the lower surfaces 412 . A guide block 416 corresponding to the guide hole 275 extends vertically upward from the first plane 413 , and the guide block 416 is hemispherical.

It can be understood that the elastic element 43 may be of other structures or shapes. At least three elastic elements 43 are arranged on the upper surface 411, and the three highest points of the three elastic elements 43 form a plane compared with the three highest points of the lower surface 412. By adjusting the height of one or two elastic elements 43, it can be guaranteed The plane formed by the three elastic elements 43 is parallel to the XY plane of the three-dimensional coordinate system.

The image sensor 42 is accommodated in the second accommodating groove 4111 of the base body 41 , and is used for converting light projected onto its surface into electrical signals. The sensing surface of the image sensor 42 is parallel to the XY plane of the three-dimensional coordinate system.

During the assembly process of the image sensing module 40 , firstly, the elastic element 43 is clamped in the groove 415 and fixed by glue, so that the protrusion 431 protrudes from the second plane 414 . When a certain pressure is applied to the protrusion 431 , the protrusion 431 moves in a direction close to the lower surface 412 . Then, the image sensor 42 is fixed in the second accommodating groove 4111 by wire bonding or welding.

As shown in Figures 5-6, during the assembly process of the lens module 100, the assembled voice coil motor 20 is first placed on the image sensor module 40, and the guide block of the base body 41 416 is accommodated in the guide hole 275 of the lower cover 27 . Then, the operator uses an automatic alignment machine (not shown) to align the optical axis of the voice coil motor 20 with the optical axis L of the image sensing module 40 . Due to the cooperation between the guide block 416 and the guide hole 275 , the voice coil motor 20 can rotate around the Z axis on the upper surface 411 of the base body 41 to adjust its position. Since the lower cover 27 of the voice coil motor 20 is carried on the base body 41 and the elastic element 43, the voice coil motor 20 can rotate on the upper surface 411 of the base body 41 around the X-axis to adjust the position relative to the image sensor 42. inclination. By adjusting the position of the voice coil motor 20 , the voice coil motor 20 and the image sensing module 40 are on the same optical axis, and finally the lower cover 27 and the base body 41 are fixed by colloidal sealing.

The lens module provided by the present invention can adjust the inclination of the voice coil motor relative to the mirror image sensing module by arranging elastic elements on the base to press the edge of the voice coil motor against the image sensing module during the assembly process. The voice coil motor is fixed to ensure the alignment accuracy of the voice coil motor and the image sensing module. In addition, the magnetic assembly is used to drive the first coil relatively arranged on the movable barrel, which effectively compensates for the shake during the working process of the lens module, thereby improving the imaging quality of the lens module

It can be understood that, for those skilled in the art, various other corresponding changes and deformations can be made according to the technical concept of the present invention, and all these changes and deformations should belong to the protection scope of the claims of the present invention .

Claims (10)

1. A lens module, comprising an image sensing module and a voice coil motor fixed on the image sensing module; the voice coil motor has an optical axis and includes a housing, a movable A barrel, a magnetic assembly, a first coil group, a second coil group, a first elastic piece, and a lower cover; the housing includes an upper cover and a side wall fixed on the edge of the upper cover, and the upper cover Form an accommodating space with the side wall; the movable cylinder is accommodated in the accommodating space; the magnetic assembly includes a plurality of magnetic groups, and the multiple magnetic groups surround the movable cylinder and are fixed in the accommodating space inside; the lower cover is fixed on the end of the side wall away from the upper cover; the first elastic piece is connected between the upper cover and the movable barrel or between the lower cover and the movable barrel, so that the movable barrel Can be moved relative to the housing; the first coil group includes multiple pairs of ring-shaped first coils, each pair of first coils is oppositely arranged and fixed on the movable cylinder, and the first coil group is used Cooperate with the magnetic assembly to drive the movable cylinder to deflect on a plane perpendicular to the optical axis to achieve anti-shake; the second coil group is in the shape of a ring, which is sleeved on the movable cylinder , the second coil group is used to cooperate with the magnetic assembly to drive the movable barrel to move up and down along the optical axis to achieve zooming; the image sensing module includes a base and an elastic element; the The seat body includes an upper surface and a lower surface opposite to the upper surface; a groove is opened on the upper surface, and the elastic element is fixed in the groove; the lower cover is carried on the upper surface and Abutting against the elastic element, the image sensing module and the voice coil motor are on the same optical axis by pressing the elastic element. 2. The lens module according to claim 1, wherein the upper surface is divided into a first plane and a second plane, and the vertical distance between the first plane and the lower surface is not greater than The groove is set on the second plane which is smaller than the vertical distance between the second plane and the lower surface. 3. The lens module according to claim 2, wherein the elastic element is in the shape of a bar, and its middle position protrudes upwards to form a protrusion, and the protrusion protrudes from the second plane and The vertical distance from the lower surface is greater than the vertical distance between the first plane and the lower surface. 4. The lens module according to claim 2, wherein a guide hole is opened on the lower cover, and a guide block extends upward from the second plane of the base body, and the guide block is accommodated in the in the guide hole. 5. The lens module according to claim 2, wherein the first plane and the second plane are respectively close to two opposite edges of the base body, and the upper surface and the lower surface The surface forms an included angle towards an edge close to the first plane. 6. The lens module according to claim 1, wherein the movable barrel comprises a first tubular portion and a second tubular portion connected to one end of the first tubular portion, the The first cylindrical part includes an upper end surface and a first outer surface, and a plurality of positioning blocks are vertically extended at a position close to the upper end surface along the circumferential direction at even intervals on the first outer surface; the first outer surface A first accommodating groove is opened along the circumferential direction near the second cylindrical portion; the first coil is fixed on the positioning block, and the second coil group is accommodated in the first accommodating slot. in the slot. 7. The lens module according to claim 6, wherein the first elastic piece comprises a first outer ring part, a first inner ring part and a ring connected between the first outer ring part and the The first connection part between the first inner ring parts, the first inner ring part is provided with a plurality of first connection holes; the upper end surface of the lens barrel extends a plurality of first connection blocks; An outer ring part is fixed to the upper cover, and the first connection block of the lens barrel is clamped in the first connection hole of the first inner ring part. 8. The lens module according to claim 7, wherein the voice coil motor further comprises a second elastic piece, and the second elastic piece comprises a second outer ring portion, a second inner ring portion and a A second connection portion connected between the second outer ring portion and the second inner ring portion, a plurality of second connection holes are opened on the second outer ring portion, and a plurality of second connection holes are opened on the second inner ring portion A plurality of third connecting holes are opened; the lower cover includes a first surface, and a plurality of first connecting posts extend from the first surface; the second cylindrical portion includes a second outer surface, the A plurality of second connection blocks are evenly spaced along the circumferential direction on the second outer surface, the first connection column is accommodated in the second connection hole, and the second connection block is accommodated in the third in the connecting hole. 9. The lens module according to claim 1, wherein each magnetic group comprises a first magnet and a second magnet stacked on the first magnet; the first magnet comprises a A first magnetic surface facing the optical axis, the second magnet includes a second magnetic surface facing the optical axis, the first magnetic surface and the second magnetic surface have different magnetic poles. 10. The lens module according to claim 9, wherein the part of each first coil close to the lower cover is opposite to the first magnetic surface, and the first coil is close to the upper cover The part is opposite to the second magnetic surface, and the second coil group is opposite to the first magnetic surface.

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