CN112965317A

CN112965317A - Optical anti-shake motor and camera module

Info

Publication number: CN112965317A
Application number: CN202110220154.1A
Authority: CN
Inventors: 董怿
Original assignee: Beijing Kelifor Technology Co ltd
Current assignee: Beijing Kelifor Technology Co ltd
Priority date: 2021-02-26
Filing date: 2021-02-26
Publication date: 2021-06-15
Also published as: CN218917883U

Abstract

The disclosure relates to an optical anti-shake motor and a camera module, wherein the motor comprises a fixed part, a fixed part and a camera module, wherein the fixed part comprises a base and a shell covered on the base; and a moving part movably mounted to the base, the outer shell is covered on the periphery of the moving part, one of the fixed part and the moving part is provided with a coil, the other one is provided with a magnet capable of generating electromagnetic induction with the coil, and the moving part is driven to move along the direction of an optical axis perpendicular to the optical device relative to the fixed part. The magnetic part can generate magnetic attraction force to the magnet to guide the moving part. The motor can provide power-off restoring force, energy consumption is saved, abnormal sound is avoided, the reset process is stable, and therefore the reliability of the optical anti-vibration motor can be improved.

Description

Optical anti-shake motor and camera module

Technical Field

The utility model relates to an optics technical field specifically, relates to an optics anti-shake motor and module of making a video recording.

Background

An optical system is a system for imaging or optical information processing, and can be applied to various fields, such as a camera of a mobile phone, a camera, or a lens of a projection technology. With the development of technology, the photographic and video effects of electronic products are becoming clearer. For example, an optical anti-shake motor is introduced into the camera module, so that the problem of unclear imaging caused by shaking in the shooting process can be solved. In the related art, a spring suspension mode is usually adopted to support and reset the moving part, but the spring type structure can cause the shake of a shot image or video due to the elastic vibration of the spring type structure in the moving process, and the imaging quality of the optical imaging system is influenced. In addition, the energy consumption of the structure adopting the spring suspension is high, and the system is easy to resonate when closed-loop control is applied, so that the control is difficult.

Disclosure of Invention

An object of the present disclosure is to provide an optical anti-shake motor and a camera module, so as to at least partially solve the problems in the related art.

In order to achieve the above object, the present disclosure provides an optical anti-shake motor including:

the fixing part comprises a base and a shell covering the base; and

a moving part movably mounted to the base, the housing being covered on an outer periphery of the moving part, one of the fixed part and the moving part being provided with a coil, and the other being provided with a magnet capable of generating electromagnetic induction with the coil to drive the moving part to move relative to the fixed part in a direction perpendicular to an optical axis of the optical device,

wherein, one side of coil dorsad the magnetite is provided with magnetic part, magnetic part sets up to, magnetic part with the produced magnetic attraction of magnetite can be in the motion portion for when the fixed part skew, drive the motion portion resets to initial position, wherein initial position, the center pin of magnetic part with the center pin of magnetite aligns.

Optionally, the optical anti-shake motor further includes a plurality of balls disposed between the fixed portion and the moving portion and capable of supporting the moving portion, and a ball groove for accommodating the balls is formed on the fixed portion or the moving portion.

Optionally, a reinforcing plate is arranged at the bottom of the ball groove, and the balls are supported on the reinforcing plate.

Optionally, the fixing portion is configured as a square structure, and the ball grooves are disposed at four corners of the square structure, and each ball groove is configured to accommodate one or more balls.

Alternatively, a width of the magnetic member in a direction in which the magnet moves relative to the coil is not larger than a dimension of the magnet.

Optionally, a width of the magnetic member at a central position close to the magnet is larger than widths of the magnetic member at both ends close to the magnet.

Optionally, the corresponding relationship between the magnetic member and the magnet is configured to:

one of the magnets corresponding in position to one of the magnetic members, or

The magnets arranged in a row correspond to the magnetic member extending in the arrangement direction of the magnets, or

The plurality of magnetic members arranged in a row correspond to one of the magnet positions extending in the arrangement direction of the plurality of magnetic members.

Alternatively, the motor may be provided with four sets of coils and magnets at equal intervals in the circumferential direction, and each opposing two of the coils and each opposing two of the magnets may be arranged in parallel.

Optionally, the optical anti-shake motor further includes a power line provided on the fixed portion, a position sensor provided on the power line, and a sensing device provided on the moving portion corresponding to a position of the position sensor.

According to the second aspect of the present disclosure, there is also provided an image pickup module including an optical device mounted to the moving part and the optical anti-shake motor provided by the present disclosure.

Through the technical scheme, when the motor is at the initial position, the magnet is aligned with the center of the magnetic part; when the motor needs to carry out shake compensation, the coil can drive the magnet to enable the fixed part and the moving part to generate relative movement, and therefore relative displacement is generated between the magnet and the magnetic part; accomplish the anti-shake action after, the magnetic part can produce magnetic attraction to the magnetite and make the motion portion get back to initial position, wherein, this magnetic attraction can also play the guide effect to the motion portion, promptly for the motion portion can not take place rotatoryly under the condition that produces linear displacement along certain direction, thereby guarantees that the drive process is more level and smooth. The motor that this disclosure provided can provide outage restoring force to can the energy saving, and avoid rocking striking abnormal sound, and this kind of structural design's reset process is more stable, thereby can improve optics anti-shake motor's reliability.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

fig. 1 is an exploded view of an optical anti-shake motor provided in an exemplary embodiment of the present disclosure;

fig. 2 is a sectional view of an optical anti-shake motor provided in an exemplary embodiment of the present disclosure;

FIG. 3 is a schematic view of a ball groove having a circular shape according to an exemplary embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a ball groove having a square shape according to an exemplary embodiment of the present disclosure;

FIG. 5 is a mounting arrangement for a power line provided in an exemplary embodiment of the present disclosure;

FIG. 6 is a mounting arrangement for a power line provided in another exemplary embodiment of the present disclosure;

FIG. 7 is a schematic view of an integrally formed ball groove provided in an exemplary embodiment of the present disclosure;

FIG. 8 is an exploded view of an assembled ball groove provided in an exemplary embodiment of the present disclosure;

FIG. 9 is an assembly schematic view of a ball groove assembly molding provided by an exemplary embodiment of the present disclosure;

FIG. 10 is a schematic top view of a ball groove tooling provided in an exemplary embodiment of the present disclosure;

FIG. 11 is a schematic bottom view of a ball groove tooling provided in an exemplary embodiment of the present disclosure;

FIG. 12 is a schematic view of a ball bearing arrangement provided in an exemplary embodiment of the present disclosure;

FIG. 13 is a schematic view of a ball bearing arrangement provided in another exemplary embodiment of the present disclosure;

FIG. 14 is a schematic view of a ball bearing arrangement provided in yet another exemplary embodiment of the present disclosure;

FIG. 15 is a schematic view of a ball bearing arrangement provided in yet another exemplary embodiment of the present disclosure;

FIG. 16 is a schematic view of a magnetic member and a magnet according to an exemplary embodiment of the present disclosure;

FIG. 17 is a schematic view of a magnetic member and a magnet according to another exemplary embodiment of the present disclosure;

FIG. 18 is a schematic view of a magnetic member and a magnet according to another exemplary embodiment of the present disclosure;

FIG. 19 is a schematic view of a magnetic member and a magnet according to another exemplary embodiment of the present disclosure;

FIG. 20 is a schematic view of an exemplary embodiment of the present disclosure provided with two sets of magnets and coils;

FIG. 21 is a schematic view of an exemplary embodiment of the present disclosure provided with four sets of magnets and coils;

FIG. 22 is a graph illustrating relative displacement of a magnet and a magnetic member versus magnetic attraction provided in an exemplary embodiment of the present disclosure;

fig. 23 is a schematic structural diagram of a camera module according to an exemplary embodiment of the present disclosure.

Description of the reference numerals

10-fixed part, 11-base, 12-housing, 20-moving part, 31-coil, 32-magnet, 40-magnetic part, 41-middle area, 50-ball, 51-ball groove, 52-reinforcing plate, 60-power-on line, 61-position sensor, 100-optical device.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, the use of directional words such as "upper, lower, left, and right" is defined according to the drawing direction of fig. 2, and "inner" and "outer" are directed to the self-profile of the corresponding component parts. Further, in the following description, when referring to the figures, the same reference numbers in different figures denote the same or similar elements.

As shown in fig. 1 and 2, the present disclosure provides an optical anti-shake motor including a fixed portion 10 and a moving portion 20 movably mounted to the fixed portion 10, where the fixed portion 10 may include a base 11 and a housing covering the base 11, the moving portion 20 may be mounted on the base 11 and covered therein by the housing 12, so that the motor can be integrally mounted to an electronic product, and in other embodiments, the fixed portion 10 may not include the housing 12, and the housing of the electronic product may be used as the housing of the motor to protect internal components. One of the fixed portion 10 and the moving portion 20 is provided with a coil 31, and the other is provided with a magnet 32 capable of generating electromagnetic induction with the coil 31 to drive the moving portion 20 to move relative to the fixed portion 10 in a direction perpendicular to the optical axis of the optical device, and the coil 31 and the magnet 32 are provided on the fixed portion 10 and the moving portion 20, respectively, as an example, which will be described below. The optical device is mounted on the moving portion 20, and the moving portion 20 drives the optical device to move in a direction perpendicular to the optical axis under the action of electromagnetic induction, so that the anti-shake effect is achieved. The optical device may include a lens body portion for transmitting light, for example, may include a lens, a lens barrel mounting the lens, and a barrel base mounting the lens barrel, and a sensor portion for receiving light, for example, may include a filter and a sensor chip that are glued together, at least one of the lens body portion and the sensor portion being mounted on the moving part 20. The magnetic member 40 is disposed on a side of the coil 31 facing away from the magnet 32, and the magnetic member 40 is configured such that a magnetic attraction force generated by the magnetic member 40 and the magnet 32 can drive the moving portion 20 to return to an initial position when the moving portion 20 is offset relative to the fixed portion 10, wherein in the initial position, a central axis of the magnetic member 40 is aligned with a central axis of the magnet 32. Here, taking fig. 2 as an example, the center axis alignment means that the center axis of the magnetic material 40 and the center axis of the magnet 32 are collinear in the vertical direction of the drawing.

By the technical scheme, when the motor is at the initial position, the magnet 32 is aligned with the center of the magnetic part 40; when the motor needs to perform shake compensation, the coil 31 drives the magnet 32 to generate relative motion between the fixed part 10 and the moving part 20, so that relative displacement occurs between the magnetic element 40 and the magnet 32; after finishing the anti-shake action, the magnetic member 40 will generate magnetic attraction to the magnet 32 to make the moving part 20 return to the initial position, wherein the magnetic attraction can also play a guiding role for the moving part 20, that is, the moving part 20 will not rotate under the condition of generating linear displacement along a certain direction, thereby ensuring that the driving process is smoother. The motor that this disclosure provided can provide outage restoring force to can the energy saving, and avoid rocking striking abnormal sound, and this kind of structural design's reset process is more stable, thereby can improve optics anti-shake motor's reliability.

In the present embodiment, referring to fig. 2, the width of the magnetic member 40 in the direction in which the magnet 32 moves relative to the coil 31 (i.e., the left-right direction of the drawing) may be larger than the size of the magnet 32. Alternatively, as shown in fig. 16 to 21, the width of the magnetic member 40 in the direction in which the magnet 32 moves relative to the coil 31 may be not larger than the size of the magnet 32, and may be equal to or smaller than the size of the magnet 32. The magnetic member 40 is not larger than the magnet 32, so that the moving part 20 can be attracted and reset better after moving.

Referring to FIG. 17, in one embodiment, the width of the magnetic member 40 at a central position near the magnet 32 is greater than the width of the magnetic member 40 at both ends near the magnet 32. Thus, the magnetic attraction force applied to the central position is larger, and it is easier to align the magnet 32 with the central axis of the magnetic member 40, so that the moving portion 20 is returned to the initial position. In this case, in order to secure the reset effect, the middle region 41 of the magnetic member 40 may be set to have a width in the direction in which the magnet 32 moves relative to the coil 31 equal to the width of the magnet 32, and widths at both ends may be smaller than the width of the magnet 32.

In the embodiment of the present disclosure, there may be a plurality of corresponding relationships between the magnetic member 40 and the magnet 32, and the following description is made with reference to the drawings. In the embodiment of fig. 16, 17 and 19, one magnet 32 may correspond to only one magnetic member 40, one magnet 32 and one magnetic member may be provided on one side of the motor as in fig. 17 and 19, or two or

more magnets

40 and 32 may be provided in one-to-one correspondence as in fig. 16; in the embodiment of fig. 20 and 21, the plurality of magnets 32 arranged in a row may correspond in position to one magnetic member 40 arranged to extend in the arrangement direction of the plurality of magnets 32, e.g., one magnetic member 40 corresponds to two magnets 32; alternatively, in the embodiment of fig. 18, the plurality of magnetic members 40 arranged in a row correspond to one magnet 32 extending in the arrangement direction of the plurality of magnetic members 40, and one magnet 32 corresponds to the plurality of magnetic members 40. The arrangement of the magnets 32 and the magnetic members 40 in the present disclosure is not limited thereto and will not be described herein too much.

Referring to fig. 22, fig. 22 is a graph showing a relationship between a relative displacement between the magnet 32 and the magnetic member 40 from the initial position and a magnetic attraction force generated therebetween according to the present disclosure, in which the abscissa indicates the relative displacement and the ordinate indicates the generated magnetic attraction force. As can be seen from the figure, the larger the relative displacement between the magnet 32 and the magnetic member 40 is, the larger the magnetic attraction force is generated between the two, and thus the larger the force for providing the reset to the moving part 20 is.

In the embodiment of the present disclosure, the optical anti-shake motor may be capable of driving the moving part 20 to move in one direction, that is, the coil 31 and the magnet 32 are disposed only on one side of the motor, or the coil 31 and the magnet 32 are disposed in parallel on the opposite side of the motor as in fig. 20. Alternatively, the optical anti-shake motor may be capable of driving the moving part 20 to move in two directions, that is, the coils 31 and the magnets 32 may be disposed at two adjacent sides of the motor, or the motor may be provided with four sets of coils 31 and magnets 32 at equal intervals in the circumferential direction as shown in fig. 21, and each two opposite coils 31 and each two opposite magnets 32 are disposed in parallel, so that the moving part 20 may be stressed in the circumferential direction in a balanced manner, so that it is more stable in the process of compensating for shake.

In the embodiment of the present disclosure, referring to fig. 1 and 2, the optical anti-shake motor may further include a power line 60 disposed on the fixed portion 10, such as the base 11, a position sensor 61 disposed on the power line 60, and a sensing device disposed on the moving portion 20 and corresponding to the position of the position sensor 61. The current carrying circuit 60 may be a circuit board structure, or may be another circuit structure capable of supplying power to the coil 31, and the induction device may be a magnetic device, or more specifically a hall magnet, for example. The energizing line 60, the position sensor 61 and the sensing device may constitute a closed-loop control system for controlling the movement of the moving part 20, the position sensor 61 can determine a position signal of the moving part 20 by detecting a position signal of the sensing device and feed back the signal to the energizing line 60, and the energizing line 60 can energize the coil 31 to control the movement of the moving part 20.

In the embodiment of the present disclosure, the optical anti-shake motor may further include a rigid supporting structure disposed between the fixed portion 10 and the moving portion 20 and capable of supporting the moving portion 20, and the rigid supporting structure is combined with the magnetic attraction resetting, so that the moving portion 20 of the optical anti-shake motor in the present disclosure may be stably supported during movement, and may also be reset to the initial position through the magnetic attraction resetting. The rigid support structure may be a plurality of balls 50 supported between the fixed portion 10 and the moving portion 20, a ball groove 51 for accommodating the balls 50 is formed on the fixed portion 10 or the moving portion 20, and rolling friction may be generated during the movement of the moving portion 20 by using the support manner of the balls 50, so that the friction coefficient is reduced compared to sliding friction, thereby reducing the resistance. Referring to fig. 3 and 4, the ball groove 51 may be configured in a circular shape, a square shape, or other suitable shapes. In other embodiments, the rigid support structure may also include a slide shaft, or a combination of a slide shaft and a ball.

The ball groove 51 may be formed in various manners, and referring to fig. 7, the ball groove 51 may be integrally formed with the fixing portion 10; referring to fig. 8, the ball groove 51 may be formed by assembling, and specifically, the fixing portion 10 may be divided into two parts, one part is used as a base, and the other part is provided with a through hole, the two parts are assembled into the structure shown in fig. 9, and the assembled through hole and the base together constitute the ball groove 51; referring again to fig. 10 and 11, the ball groove 51 may be formed by means of secondary processing.

According to an embodiment of the present disclosure, referring to fig. 5 and 6, the bottom of the ball groove 51 may be provided with a reinforcing plate 52, such as a metal plate, and the balls 50 are supportably disposed on the reinforcing plate 52. The reinforcing plate 52 can improve the strength of the fixing portion 10 and prevent the balls 50 from forming a recess in the fixing portion 10, thereby ensuring the life span of the motor. In the case where the energizing path 60 is provided, the energizing path 60 and the reinforcing plate 52 may be located relative to each other such that the coil 31 is provided between the reinforcing plate 52 and the energizing path 60 as shown in fig. 5, or the energizing path 60 may be attached to the reinforcing plate 52 and the coil 31 may be provided above the energizing path 60 as shown in fig. 6.

In the present disclosure, referring to fig. 7 to 15, taking the example that the fixing portion 10 is configured as a square structure, when supported by the balls 50, ball grooves 51 may be provided at four corners of the square structure, each ball groove 51 is configured to be able to accommodate one or more balls 50, as in fig. 7 to 11 and 13 and 14, each ball groove 51 accommodates one ball 50, wherein in fig. 13 and 14, a plurality of ball grooves 51 are provided at each corner, in fig. 12 and 15, only one ball groove 51 is provided at each corner, and a plurality of balls 50 may be provided in each ball groove 51. The balls 50 are provided at all four corners of the fixed part 10, so that the moving part 20 can be more stably supported. By providing a plurality of balls 50 at each corner, the pressure from the moving part 20 can be equally divided, thereby reducing stress, and the material requirements and material costs can be reduced.

According to a second aspect of the present disclosure, referring to fig. 23, there is also provided a camera module, which includes the optical device 100 and the optical anti-shake motor described above, wherein the optical device 100 can be mounted on the moving part 20 of the motor. The camera module has all the beneficial effects of the automatic focusing motor, and the details are not repeated herein.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. An optical anti-shake motor, comprising:

a fixing part (10) including a base (11) and a housing (12) covering the base (11); and

a moving part (20) movably mounted to the base (11), the housing (12) covering the moving part (20), one of the fixed part (10) and the moving part (20) being provided with a coil (31), the other being provided with a magnet (32) capable of generating electromagnetic induction with the coil (31) to drive the moving part (20) to move relative to the fixed part (10) in a direction perpendicular to the optical axis of the optical device,

wherein, one side of coil (31) back to magnetite (32) is provided with magnetic part (40), magnetic part (40) set up to, magnetic attraction that magnetic part (40) and magnetite (32) produced can drive when motion portion (20) for fixed part (10) skew motion portion (20) reset to initial position, wherein in initial position, the center pin of magnetic part (40) with the center pin alignment of magnetite (32).

2. The optical anti-shake motor according to claim 1, further comprising a plurality of balls (50) disposed between the fixed part (10) and the moving part (20) and capable of supporting the moving part (20), wherein a ball groove (51) for receiving the ball (50) is formed on the fixed part (10) or the moving part (20).

3. The optical anti-shake motor according to claim 2, wherein a reinforcing plate (52) is provided at the bottom of the ball groove (51), and the balls (50) are supported on the reinforcing plate (52).

4. The optical anti-shake motor according to claim 2, wherein the fixing portion (10) is configured in a square structure, and the ball grooves (51) are provided at four corners of the square structure, each of the ball grooves (51) being configured to accommodate one or more balls (50).

5. The optical anti-shake motor according to claim 1, wherein a width of the magnetic member (40) in a direction in which the magnet (32) moves relative to the coil (31) is not greater than a dimension of the magnet (32).

6. The optical anti-shake motor according to claim 1, wherein a width of the magnetic member (40) at a position near a center of the magnet (32) is larger than widths of the magnetic member (40) at both ends near the magnet (32).

7. The optical anti-shake motor according to claim 1, wherein the correspondence relationship between the magnetic member (40) and the magnet (32) is configured to:

one of the magnets (32) corresponds in position to one of the magnetic members (40), or

The magnets (32) arranged in a row correspond to one magnetic member (40) extending in the arrangement direction of the magnets (32), or

The plurality of magnetic members (40) arranged in a row correspond to one magnet (32) extending in the arrangement direction of the plurality of magnetic members (40).

8. The optical anti-shake motor according to claim 1, wherein four sets of coils (31) and magnets (32) are provided at equal intervals in the circumferential direction, and each opposing two of the coils (31) and each opposing two of the magnets (32) are provided in parallel.

9. The optical anti-shake motor according to claim 1, further comprising a power-on line (60) provided on the fixed part (10), a position sensor (61) provided on the power-on line (60), and a sensing device provided on the moving part (20) corresponding to the position of the position sensor (61).

10. A camera module, characterized in that it comprises an optical device and an optical anti-shake motor according to any one of claims 1-9, the optical device being mounted to the moving part (20).