CN216792649U

CN216792649U - Lens driving device

Info

Publication number: CN216792649U
Application number: CN202122692407.3U
Authority: CN
Inventors: 鲍和平; 彭坤; 林聪�; 刘富泉; 吕新科
Original assignee: Henan Hozel Electronics Co Ltd
Current assignee: Henan Hozel Electronics Co Ltd
Priority date: 2021-11-04
Filing date: 2021-11-04
Publication date: 2022-06-21
Anticipated expiration: 2031-11-04

Abstract

The utility model discloses a lens driving device which comprises a shell, a base, a carrier, a lens driving mechanism and a carrier positioning mechanism. The shell forms the cavity with the base cooperation, the carrier, camera lens actuating mechanism and carrier positioning mechanism set up in the cavity, camera lens actuating mechanism including set up the drive coil on the base and organize with drive coil complex magnetite, carrier positioning mechanism includes the iron core, positioning coil, shell fragment and frame, the frame set up in the shell and with base fixed connection, the shell fragment with frame fixed connection and to the carrier exert elasticity in order to fix a position the carrier, the iron core sets up on the frame and is equipped with positioning coil, exert force to the shell fragment when positioning coil circular telegram and make the shell fragment break away from the carrier, thereby the carrier can follow the motion of optical axis direction for the base. According to the utility model, the driving coil is arranged on the base, and the magnet group is arranged on the carrier, so that the power supply device has the beneficial technical effects of stable power supply performance and long service life.

Description

Lens driving device

Technical Field

The utility model relates to the field of optical drive, in particular to a lens driving device.

Background

With the development of technology, many electronic devices (such as smart phones or digital cameras) have a function of taking pictures or recording videos. The use of these electronic devices is becoming more common and the design direction of these electronic devices is being developed to be more convenient and thinner to provide more choices for users. However, in the lens driving mechanism of the current handheld device such as a mobile phone, the coil is usually disposed on the carrier, and the magnet set matched with the coil is disposed on the base or the housing, so that in the moving process of the carrier, the coil moves along with the carrier, which easily causes the instability of the circuit and shortens the service life.

In addition, the current devices such as mobile phones and the like have wide use scenes, and when the devices are used in places with poor environments, impurities such as ash layers and the like easily enter the camera device to influence the imaging effect.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to provide a lens driving device to solve the above problems in the prior art.

In order to solve the above problems, according to one aspect of the present invention, there is provided a lens driving device, comprising a housing, a base, a carrier, a lens driving mechanism, and a carrier positioning mechanism, wherein the housing and the base cooperate to form a chamber, the carrier, the lens driving mechanism, and the carrier positioning mechanism are disposed in the chamber,

the lens driving mechanism is used for driving the carrier to move relative to the base and comprises a driving coil arranged on the base and a magnet group matched with the driving coil,

the carrier positioning mechanism comprises an iron core, a positioning coil, an elastic sheet and a frame, the frame is arranged in the shell and fixedly connected with the base, the elastic sheet is fixedly connected with the frame and applies elasticity to the carrier so as to position the carrier, the iron core is arranged on the frame and provided with the positioning coil, and when the positioning coil is electrified, the elastic sheet is applied with force to separate from the carrier, so that the carrier can move along the direction of an optical axis relative to the base.

In one embodiment, the carrier positioning mechanism further includes a positioning element, one end of the elastic sheet is fixedly connected with the frame, the other end of the elastic sheet is provided with the positioning element, the positioning element is matched with the carrier and fixes the carrier under the elastic action of the elastic sheet, and the positioning element is separated from the carrier when the positioning coil is powered on.

In one embodiment, the lens driving device further includes a bearing sleeve and a movable sleeve, the base is provided with a cylindrical protrusion, the bearing sleeve is arranged inside the cylindrical protrusion and used for connecting the lens, the movable sleeve is arranged outside the cylindrical protrusion, and the magnet group is arranged between the cylindrical protrusion and the movable sleeve and surrounds the cylindrical protrusion.

In one embodiment, the top end of the bearing sleeve is provided with an edge protrusion and is fixedly connected with the top end of the magnet, the top end of the movable sleeve is connected with the top end of the bearing sleeve, and the bottom end of the movable sleeve and the bottom end of the magnet group are fixedly connected with the carrier.

In one embodiment, the base is provided with a base built-in circuit board, the coil is electrically connected with the base built-in circuit board through a wiring terminal, the magnet group comprises a plurality of magnets, and avoidance gaps are arranged among the magnets to avoid the wiring terminal.

In one embodiment, the base comprises a bottom part and a cylindrical protrusion, the cylindrical protrusion is integrally and upwards formed from the bottom part, a coil groove is formed in the outer side wall of the cylindrical protrusion, and the driving coil is arranged in the coil groove.

In one embodiment, the lens driving device further includes a guide post fixedly mounted at the bottom of the base, and the carrier is provided with a guide hole, and the guide post is matched with the guide hole to guide the carrier.

In one embodiment, the lens driving device further includes a flexible circuit board and a magnetic grid, one end of the flexible circuit board is fixedly connected with the carrier and is provided with a position sensor, the other end of the flexible circuit board is electrically connected with the base built-in circuit board, and the magnetic grid is arranged on the frame or the shell and is matched with the position sensor.

In one embodiment, the lens driving device further includes an optical filter and an FPC module, the FPC module is disposed below the base and electrically connected to the circuit board built in the base, and the optical filter is disposed in the bottom groove of the base and is engaged with the lens.

In one embodiment, the lens driving device further comprises a lens and a glass cover, wherein the glass cover is arranged at the front end of the lens, arranged on the inner side of the top end of the movable sleeve and connected with the top end of the edge bulge of the movable sleeve.

In one embodiment, the base built-in circuit board has eight output pins, wherein two output pins are used for being electrically connected with the driving coil, two output pins are used for being electrically connected with the positioning coil, four output pins are used for being electrically connected with the flexible FPC board, and the input end of the base built-in circuit board is electrically connected with the FPC module, so that the power supply operation of the driving coil, the positioning coil and the flexible FPC board is realized.

The driving coil is creatively arranged on the base, the magnet group matched with the driving coil is arranged on the carrier, and the power supply to the driving coil is realized through a unique structural design, so that the utility model has the beneficial technical effects of stable power supply performance and long service life. In addition, in some embodiments, the present invention also achieves excellent dust-proof effects through a unique design of dust-proof structure.

Drawings

Fig. 1 illustrates an exploded perspective view of a lens driving apparatus according to an embodiment of the present invention.

Fig. 2 and 3 are perspective views of assembled partial assemblies of a lens apparatus according to an embodiment of the present invention from different perspectives.

Fig. 4 is a perspective view of a frame of a lens driving apparatus according to an embodiment of the present invention.

Fig. 5 is a sectional view of a lens driving apparatus according to an embodiment of the present invention.

Fig. 6 is a perspective view of a base of a lens driving apparatus according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of the wiring connection according to one embodiment of the present invention.

Detailed Description

The objects, features and advantages of the present invention will be more clearly understood from the following detailed description of the preferred embodiments of the present invention taken in conjunction with the accompanying drawings. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the essential spirit of the technical solution of the present invention.

In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In the following description, for the purposes of clearly illustrating the structure and operation of the present invention, directional terms will be used, but terms such as "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be construed as words of convenience and should not be construed as limiting terms.

The present disclosure generally relates to a lens driving device, which can be used in a terminal product such as a mobile phone and a tablet computer to cooperate with a lens to achieve functions of taking pictures and recording videos. For convenience of description, the present application introduces the concept of "optical axis" for indicating the direction of propagation of light rays within an optical element, which is an abstraction and does not mean that there is an axis in a physical sense, and the direction along the optical axis is referred to as longitudinal direction.

Fig. 1 illustrates an exploded perspective view of a lens driving apparatus according to an embodiment of the present invention. Fig. 2 and 3 are perspective views of assembled parts of a lens apparatus according to an embodiment of the present invention, as shown in fig. 1-3, a lens driving apparatus 100 includes a housing 10, a base 20, a carrier 30, a lens driving mechanism 40 and a carrier positioning mechanism 50, the housing 10 cooperates with the base 20 to form a chamber, the carrier 30, the lens driving mechanism 40 and the carrier positioning mechanism 50 are disposed in the chamber, the lens driving mechanism 40 includes a driving coil 41 disposed on the base 20 and a magnet group 42 cooperating with the driving coil 41 and used for driving the carrier 30 to move relative to the base 20 to realize an optical zoom function, the carrier positioning mechanism 50 includes a spring 51, an iron core 52, a positioning coil 53 and a frame 54, the frame 54 is disposed in the housing 10 and fixedly connected with the base 20, the spring 51 is fixedly connected with the frame 54 and applies an elastic force to the carrier 30 to position the carrier 30, the iron core 52 is disposed on the frame 54 and provided with a positioning coil 53, the carrier positioning mechanism 50 is equivalent to a control switch for positioning the carrier 30, when the positioning coil 53 is not energized, the elastic sheet 51 applies an elastic force to the carrier, the carrier 30 cannot move relative to the base 20, and when the positioning coil 53 is energized, the iron core 52 applies an force to the elastic sheet 51 to overcome the elastic force of the elastic sheet 51, so that the carrier 30 can move relative to the base 20. For example, when optical zooming is required, the positioning coil 53 is powered on, the iron core 52 applies force to the elastic sheet 51 to overcome the elastic force of the elastic sheet 51, the lens driving mechanism drives the carrier 30 to move longitudinally to realize the zooming function, and when the optical zooming is not required, the positioning coil 53 is powered off, the elastic sheet 51 applies force to the carrier 30, and the carrier 30 and the base 20 are relatively fixed, so that the stability of the carrier 30 is ensured, and the carrier 30 and the lens move longitudinally relative to the base under the action of gravity when devices such as a mobile phone, a tablet personal computer and the like provided with the lens driving device are inverted is avoided.

With continued reference to fig. 1-3, in one embodiment, the carrier positioning mechanism further includes a positioning element 55, one end of the elastic sheet 51 is fixedly connected to the frame 54, the other end of the elastic sheet 51 is provided with the positioning element 55, the positioning element 55 is engaged with the carrier 30 and fixes the carrier 30 under the elastic force of the elastic sheet 51, and the positioning element 55 is separated from the carrier 30 when the positioning coil 53 is energized.

Specifically, referring to fig. 4, which shows a perspective view of a frame 54 according to an embodiment of the present invention, an opening 541 for engaging with a lens is disposed at the top of the frame 54, and the bottom of the frame is open for engaging with a carrier, a spring mounting groove 542 and a positioning member mounting groove 543 are disposed on a side wall of the frame 54 for respectively mounting a spring 51 and a positioning member 55, the positioning member 55 is clamped at the top end of the carrier 30 under the elastic force of the spring 51, so that the carrier 30 cannot move longitudinally, and stability of the carrier 30 is ensured, when the positioning coil 53 is powered on, the iron core 52 attracts the positioning member 55, the positioning member 55 moves in a direction away from the carrier 30 and is separated from the carrier 30, and the carrier 30 is not clamped any more, so that the carrier 30 and the lens can move longitudinally by powering on the driving coil 41, thereby implementing an optical zoom function. When the carrier 30 and the lens are reset, the positioning coil 53 is powered off, and the positioning member 55 positions the carrier 30 again under the elastic action of the elastic sheet 51.

Fig. 5 is a sectional view of a lens driving apparatus according to an embodiment of the present invention. As shown in fig. 1 and 5, in one embodiment of the present invention, the lens driving device 100 further includes a carrier sleeve 60 and a movable sleeve 70, the base 20 is provided with a cylindrical protrusion 21, an outer peripheral wall of the cylindrical protrusion 21 is provided with a coil groove 211, the driving coil 41 is disposed in the coil groove 211, the carrier sleeve 60 is disposed inside the cylindrical protrusion 21 and is used for connecting the lens, the movable sleeve 70 is disposed outside the cylindrical protrusion 21, and the magnet group 42 is disposed between the cylindrical protrusion 21 and the movable sleeve 70 and is disposed around the cylindrical protrusion 21.

Optionally, the top end of the bearing sleeve 60 is provided with an edge protrusion 61 and is fixedly connected with the top end of the magnet group 42, the top end of the movable sleeve 70 is fixedly connected with the top end of the bearing sleeve 60, and the bottom end of the movable sleeve 70 and the bottom end of the magnet group 42 are fixedly connected with the carrier 30.

As shown in fig. 2, when impurities such as dust enter from the top, due to the shielding of the movable sleeve 70 and the top of the bearing sleeve 60, the impurities can only move to the base along the gap between the inner side wall of the frame 54 and the outer side wall of the movable sleeve 70, and when approaching the top of the carrier 30, move downwards along the outer side wall of the carrier 30, and then only enter from the bottom of the carrier and are blocked by the cylindrical protrusions 21, and then only move upwards along the gap between the inner wall of the magnet group 42 and the outer wall of the cylindrical protrusions 21, and when reaching the top, are blocked by the edge protrusions 61 of the set of sleeves 60, and then move downwards along the outer wall of the bearing sleeve 60. Therefore, at least two 180-degree path bends are needed for impurities such as dust to enter the interior, and therefore the dustproof structure achieves excellent dustproof effect through complex path design.

In addition, in one embodiment of the present invention, the driving coil is disposed on the base, the magnet group is fixedly disposed in the frame and is fixedly connected to the carrier by the frame, that is, the magnet group is indirectly fixed to the carrier, which is significantly different from the conventional design that the driving coil is disposed on the carrier and the magnets are disposed in the base or the housing.

In one embodiment, as shown in fig. 1, the base 20 is provided with a base built-in circuit board, the driving coil 41 is electrically connected to the base built-in circuit board through a terminal 411, and the magnet group 42 includes a plurality of magnets, and an escape gap is provided between the plurality of magnets to escape the terminal 411.

Fig. 6 is a perspective view of the base 20 of one embodiment of the present invention. In one embodiment, the base 20 is connected with the carrier 30 through the guide posts 25, as shown in fig. 6, the base 20 includes a bottom portion 22 and a cylindrical protrusion 21 protruding upward from the bottom portion 22, a coil groove 23 is formed on an area of an outer side wall of the cylindrical protrusion 21 near the top portion, and the driving coil 41 is disposed in the coil groove 23. The bottom 22 is further provided with a guide post mounting hole 24, the guide post mounting hole 24 is used for fixedly mounting a guide post 25, correspondingly, the carrier 30 is provided with a guide hole matched with the guide post 25, the base 20 is connected with the carrier 30 through the matching of the guide hole and the guide post 25, and the carrier 30 can move along the guide post relative to the base, so that the movement of the carrier 30 is guided.

Referring back to fig. 2 to 3, in one embodiment, the lens driving apparatus 100 further includes a flexible circuit board 81 and a magnetic grid 82, one end of the flexible circuit board 81 is fixedly connected to the carrier 30 and provided with a position sensor 811, the other end of the flexible circuit board 80 is electrically connected to the embedded metal sheet of the base 20 so as to be connected to an external circuit, the magnetic grid 82 is provided on the frame 54 or the housing 10 and cooperates with the position sensor 811, and the position of the carrier 30 can be monitored by the magnetic grid 82 when the position sensor 811 follows the longitudinal movement of the carrier 30.

Alternatively, referring back to fig. 4, one side wall of the frame 54 is provided with an FPC board (flexible printed circuit board) escape groove 544 and a magnetic grid mounting groove 545, the FPC board escape groove 544 is used for escape operation when the flexible FPC board 81 and the position sensor 811 move longitudinally, and the magnetic grid mounting groove 544 is used for mounting the magnetic grid 82, it should be understood by those skilled in the art that in another embodiment, the magnetic grid 82 may be mounted on the inner side wall of the housing 10, and the magnetic grid mounting groove 544 is used as an escape groove, as long as the position sensor 811 corresponds to the magnetic grid 82.

In one embodiment, referring to fig. 6, a terminal groove 26 is further provided on an outer side wall of the cylindrical protrusion 21 of the base 20 for mounting a terminal 411 for connecting the driving coil 41 and the flexible circuit board 81.

In one embodiment, referring to fig. 1 and 6, the lens driving device 100 further includes an optical filter 83 and an FPC module 84, the FPC module 84 is disposed at the bottom of the base 20 and electrically connected to the base built-in circuit board, and the optical filter 83 is disposed in a bottom groove of the base and disposed opposite to the lens.

Fig. 7 is a schematic diagram of the wiring connections of one embodiment of the present invention. As shown in fig. 7, the base built-in wiring board 27 has eight output pins 271, two of which are used for electrical connection with the terminal 411 of the driving coil 41, the other two of which are used for electrical connection with the positioning coil 53, and the remaining four of which are used for connection with one end of the flexible FPC board 81, and the input end of the base built-in wiring board is electrically connected with the FPC module 84, thereby realizing the power supplying operation of the driving coil 41, the positioning coil 53, and the flexible FPC board 84.

While the preferred embodiments of the present invention have been illustrated and described in detail, it should be understood that various changes and modifications of the utility model can be effected therein by those skilled in the art after reading the above teachings of the utility model. Such equivalents are intended to fall within the scope of the claims appended hereto.

Claims

1. A lens driving device is characterized in that the lens driving device comprises a shell, a base, a carrier, a lens driving mechanism and a carrier positioning mechanism, wherein the shell and the base are matched to form a cavity, the carrier, the lens driving mechanism and the carrier positioning mechanism are arranged in the cavity,

2. The lens driving apparatus as claimed in claim 1, wherein the carrier positioning mechanism further includes a positioning member, one end of the elastic piece is fixedly connected to the frame, the other end of the elastic piece is provided with the positioning member, the positioning member is engaged with the carrier and fixes the carrier under an elastic force of the elastic piece, and the positioning member is separated from the carrier when the positioning coil is energized.

3. A lens driving device according to claim 1, further comprising a bearing sleeve and a movable sleeve, wherein the base is provided with a cylindrical projection, the bearing sleeve is provided inside the cylindrical projection and is used for connecting a lens, the movable sleeve is provided outside the cylindrical projection, and the magnet group is arranged between the cylindrical projection and the movable sleeve and around the cylindrical projection.

4. A lens driving device as claimed in claim 3, wherein the top end of the bearing sleeve is provided with a rim protrusion and is fixedly connected to the top end of the magnet, the top end of the movable sleeve is connected to the top end of the bearing sleeve, and the bottom end of the movable sleeve and the bottom end of the magnet assembly are fixedly connected to the carrier.

5. The lens driving device according to claim 1, wherein the base is provided with a base built-in circuit board, the coil is electrically connected to the base built-in circuit board through a terminal, the magnet group includes a plurality of magnets, and an avoidance gap is provided between the plurality of magnets so as to avoid the terminal.

6. A lens driving device according to claim 1, wherein the base includes a bottom portion and a cylindrical projection integrally formed to project upward from the bottom portion, an outer side wall of the cylindrical projection is provided with a coil groove, and the driving coil is disposed in the coil groove.

7. The lens driving device according to claim 6, further comprising a guide post fixedly installed at a bottom of the base, wherein the carrier is provided with a guide hole, and the guide post is engaged with the guide hole to guide the carrier.

8. A lens driving device as claimed in claim 1, further comprising a flexible circuit board and a magnetic grid, wherein one end of the flexible circuit board is fixedly connected to the carrier and is provided with a position sensor, the other end of the flexible circuit board is electrically connected to the built-in circuit board of the base, and the magnetic grid is disposed on the frame or housing and is engaged with the position sensor.

9. The lens driving apparatus as claimed in claim 8, further comprising an optical filter and an FPC module, wherein the FPC module is disposed under the base and electrically connected to the circuit board built in the base, and the optical filter is disposed in a bottom recess of the base and engaged with the lens.

10. The lens driving apparatus according to claim 4, further comprising a lens and a glass cover provided at the front end of the lens and disposed inside the top end of the movable sleeve and connected with the edge projection top end of the movable sleeve.

11. The lens driving device according to claim 9, wherein the base built-in wiring board has eight output pins, two of which are electrically connected to the driving coil, two of which are electrically connected to the positioning coil, four of which are electrically connected to the flexible circuit board, and an input terminal of the base built-in wiring board is electrically connected to the FPC module, thereby achieving a power supplying operation to the driving coil, the positioning coil, and the flexible circuit board.