CN113515001A

CN113515001A - Anti-shake motor

Info

Publication number: CN113515001A
Application number: CN202110861764.XA
Authority: CN
Inventors: 龚高峰; 王建华; 朱春明
Original assignee: Changting County Bilu Electronics Co ltd; Shanghai BL Electronics Co Ltd
Current assignee: Changting County Bilu Electronics Co ltd; Shanghai BL Electronics Co Ltd
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2021-10-19
Also published as: WO2023005040A1

Abstract

The invention discloses an anti-shake motor, which comprises a shell, a base, a frame and a carrier for fixing a lens, wherein the shell is provided with a groove; the frame is connected with the base in a sliding mode, and the shell is fixedly connected with the base to limit the moving range of the frame; and a return spring for guiding the frame to return to an initial position is arranged between the frame and the base. The anti-shake motor is characterized in that a sliding mechanism is arranged between the frame and the base, so that the frame is connected with the base in a sliding manner; the limitation of a suspension wire scheme is avoided, and the XY axis plane can realize the correction amplitude of 3 degrees; meanwhile, the Z-axis movement does not need to overcome the elasticity of an upper spring and a lower spring of a conventional AF motor, the power-on circuit of the driving coil is short, welding spots are few, the structure is more stable, and high-thrust driving can be realized while the performance of the motor is improved.

Description

Anti-shake motor

Technical Field

The invention relates to an anti-shake motor which is used for preventing camera shake of portable equipment such as mobile phones and notebook computers.

Background

Recently, high-performance lens driving devices are disposed in portable terminal devices such as portable cameras, smart phones, and tablet computers. These lens driving apparatuses generally have auto-focus and anti-shake functions. The anti-shake function can reduce blurring caused by external vibration or shaking of the user's hand.

In a conventional lens driving device having an anti-shake function, in order to realize auto-focusing, a focusing coil is energized to drive a lens to move up and down in an optical axis direction thereof. However, in these lens driving devices, in order to introduce a current from the outside of the lens module to the focus coil, a suspension wire is generally required, which relies on an elastic restoring force to prevent shaking, thereby causing the lens driving device to be rapidly restored to an original position, and thus, the role of the suspension wire in the lens driving device includes: the circuit connection, bear camera lens and AF motor, elasticity shake and carry out anti-shake and revise, adopt the problem that the suspension wire exists to have: when a heavier lens is borne, the anti-shake correction amplitude of the suspension wire is smaller, the suspension wire is easy to bend and deform, and welding spots at two ends of the suspension wire are easy to loosen, so that the connection stability of a motor circuit and the anti-shake correction precision are influenced.

Disclosure of Invention

The invention aims to provide an anti-shake motor which has a novel and unique structure, is convenient to use and can effectively improve the anti-shake performance; the specific technical scheme is as follows:

an anti-shake motor includes a housing, a base, a frame, and a carrier for fixing a lens; the frame is connected with the base in a sliding mode, and the shell is fixedly connected with the base to limit the moving range of the frame; and a return spring for guiding the frame to return to an initial position is arranged between the frame and the base.

Further, the outer shape of the shell position is rectangular; the return spring extends along the Z-axis direction and is arranged at four corners of the rectangle.

Further, the top end face of the base is provided with at least 3 ball grooves, balls are arranged in the ball grooves, the bottom end face of the frame is provided with a sliding plane matched with the balls, and the sliding plane is matched with the balls to realize sliding connection of the frame and the base.

Furthermore, an X-axis driving coil and a Y-axis driving coil are arranged on the top end face of the base; and an X-axis magnet and a Y-axis magnet are respectively arranged at the positions of the bottom end surface of the frame corresponding to the X-axis driving coil and the Y-axis driving coil.

Further, a sliding support surface for supporting the carrier to slide along the Z axis is arranged on the inner side of the frame; and an abutting mechanism for abutting the carrier against the sliding support surface.

Further, the sliding support surface is formed by two sliding mechanisms in the Z-axis direction.

Furthermore, the sliding mechanism is composed of a guide post and two groups of balls arranged along the Z-axis direction.

Furthermore, the abutting mechanism consists of a Z-axis magnet on the carrier and a magnetic suction sheet fixed on the frame and corresponding to the Z-axis magnet.

The anti-shake motor is characterized in that a sliding mechanism is arranged between the frame and the base, so that the frame is connected with the base in a sliding manner; the limitation of a suspension wire scheme is avoided, and the XY axis plane can realize the correction amplitude of 3 degrees; meanwhile, the Z-axis movement does not need to overcome the elasticity of an upper spring and a lower spring of a conventional AF motor, the power-on circuit of the driving coil is short, welding spots are few, the structure is more stable, and high-thrust driving can be realized while the performance of the motor is improved.

Drawings

FIG. 1 is a schematic view of an anti-vibration motor according to the present invention;

FIG. 2 is a schematic structural view of a base unit;

FIG. 3 is an exploded view of the anti-shake motor according to the present invention;

FIG. 4 is a schematic structural view of a frame unit;

FIG. 5 is a schematic view of a carrier unit structure.

In the figure: 1. a housing; 2. a carrier unit; 21. a carrier; 22. a Z-axis magnet; 23. a guide post; 24. a guide ball; 25. a Z-axis Hall magnet; 3. a frame unit; 31. an X-axis magnet; 32. a Y-axis magnet; 33. FPC; 331. a Z-axis drive coil; 332. a Z-axis Hall chip; 34. a magnetic shielding sheet; 35. a magnetic attraction sheet; 36. a frame; 37. a ball receiving groove; 4. a base unit; 41. sliding planar balls; 42. an X-axis drive coil; 43. a Y-axis drive coil; 44. an interface terminal; 45. An X-axis Hall chip; 46. a Y-axis Hall chip; 47. a base; 5. a return spring.

Detailed Description

The present invention will now be more fully described with reference to the following examples. This invention may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein.

For ease of description, spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1 to 4, the anti-shake motor in the present embodiment includes a housing 1, a base 47, a frame 36, and a carrier 21 for fixing a lens; wherein the frame 36 is slidably connected to the base 47. Because the frame 36 and the base 47 are not connected by using a suspension wire, when the X-axis driving coil 42 drives the X-axis magnet 31 or the Y-axis driving coil 43 drives the Y-axis magnet 32, the frame 36 can freely slide relative to the base 47, and the resistance is small; no longer being hindered by the suspension wires; the correction amplitude is improved to 3 degrees from 1-2 degrees of the common OIS motor. Naturally, the problems of easy bending deformation, easy loosening of welding points at two ends and the like caused by the suspension wires are also solved.

Because the shell 1 is fixedly connected with the base 47, the moving range of the frame can be limited, and the frame is prevented from exceeding the controllable range of the coil; a return spring 5 for guiding the frame 36 to return to an initial position is arranged between the frame 36 and the base 47; so that the frame 36 is at an initial position at the center of the base 47 when the anti-shake operation is not required, the anti-shake range can be equalized in all directions.

The shape of the shell is rectangular, so that the miniaturization of products is facilitated, and the processing and the use are convenient; at this time, the return springs 5 may be disposed at four corners of the rectangle. The return spring 5 can be arranged to extend along the Z-axis direction, which is beneficial to product miniaturization. Of course, the return spring 5 may also be inclined inwardly, or outwardly; the frame 36 is pulled back to the initial position at the center of the base 47 only in the case where neither the X-axis drive coil 42 nor the Y-axis drive coil 43 is energized. The outer shape of the shell can be cylindrical or hexagonal and the like; when the shell is in other shapes, the return springs 5 are uniformly distributed along the outer edge of the shell.

As shown in fig. 2, at least 3 ball grooves are formed in the top end surface of the base, sliding plane balls 41 are arranged in the ball grooves, and fixed points of all the sliding plane balls 41 form a sliding support plane; the adoption of the balls is beneficial to reducing the friction force when the base and the frame slide relatively. The bottom end face of the frame is provided with a sliding plane matched with the balls, and the sliding plane is matched with the sliding plane balls 41 to realize sliding connection of the frame and the base. The sliding connection mechanism is simple in structure, capable of achieving large compensation angle, accurate in displacement control, high in sensitivity and high in reliability. Wherein, the mounting groove space of the sliding plane ball 41 is larger than the diameter of the sliding plane ball 41; the sliding plane ball 41 is enabled to roll in the mounting groove as much as possible, and the sliding motion of the sliding plane ball 41 in the mounting groove is reduced. The frame 36 and the base 47 may be slidably connected using an existing sliding mechanism. For example: the two groups of sliding rails and the sliding block form an X-axis direction sliding platform; the Y-axis direction sliding platform is combined with the two groups of sliding rails and the sliding block to form free sliding in the XY direction; or the frame 36 is suspended above the base 47 by the repulsive force of the permanent magnet.

An X-axis driving coil and a Y-axis driving coil can be arranged on the top end face of the base; and an X-axis magnet and a Y-axis magnet are respectively arranged at the positions of the bottom end surface of the frame corresponding to the X-axis driving coil and the Y-axis driving coil. An X-axis driving coil and a Y-axis driving coil which need to be electrified are arranged on a fixed base; the X-axis magnet and the Y-axis magnet which do not need to be electrified are arranged on the movable frame, so that the failure rate of the product is reduced.

To reduce drag, the carrier 21, which is nested within the frame 36, must be a clearance fit with the frame 36. In order to further reduce the resistance, the inner side of the frame 36 is provided with a sliding support surface for supporting the carrier 21 to slide along the Z-axis; meanwhile, an abutting mechanism for abutting the carrier against the sliding support surface is also arranged. The abutting mechanism ensures that the carrier 21 is always in contact with the sliding support surface when sliding along the Z axis, and the sliding support surface is utilized to the maximum extent to reduce resistance.

The sliding support surface is composed of two sliding mechanisms in the Z-axis direction. The sliding mechanism can be composed of a sliding block and a guide rail.

As shown in fig. 4 (for convenience of illustration, the frame unit 3 is rotated by 180 degrees around the Z-axis), the sliding mechanism may also be composed of a guide post 23 and two sets of guide balls 24 arranged in the Z-axis direction; the adoption of the balls is beneficial to reducing the friction force of the sliding mechanism. Adjacent corners of the frame 36 are each provided with a ball receiving groove 37, at least two of the guide balls 24 in each set. The direct contact between adjacent balls in the Z-axis direction is avoided, so that the resistance is increased. Transition balls are arranged between two adjacent guide balls 24, and the diameter of each transition ball is smaller than that of each support ball; the guide balls 24 are in contact with the guide columns 23, the rolling directions are the same, and are opposite to the rolling direction of the transition balls, so that the friction force is reduced, namely the driving resistance is small, the power consumption of the motor is reduced, and the large-thrust driving is realized; the depth of the receiving groove for the guide ball 24 does not have to be increased.

The abutting mechanism consists of a Z-axis magnet 22 on the carrier and a magnetic suction sheet 35 which is fixed on the frame 36 and corresponds to the Z-axis magnet 22. The magnetic attraction sheet 35 attracts the Z-axis magnet 22, and the carrier 21 is always in contact with the sliding support surface when sliding along the Z-axis. Of course, it is also possible to use magnets of opposite polarity to push the distal Z-axis magnet 22.

In operation, the base 47, the X-axis drive coil 42, the Y-axis drive coil 43, the X-axis hall chip 45, and the Y-axis hall chip 46 constitute the base unit 4. An interface terminal 44 provided at the bottom of the base unit 4 introduces a current for controlling the coil, outputs a hall signal for feeding back the offset positions of the X-axis magnet 31 and the Y-axis magnet 32, and supplies power to the hall chip. The X-axis drive coil 42 and the Y-axis drive coil 43 are both two coils; providing a greater driving force; the two coils are arranged diagonally and staggered with the X-axis magnet 31 and the Y-axis magnet 32 below, so that the interference between the Z-axis magnet 22 and the X-axis magnet 31 and the Y-axis magnet 32 is reduced; and the installation space is greatly increased, a larger driving coil can be installed, and the larger driving force can be provided. Correspondingly, sliding flat balls 41 are mounted on the 4 sides. The mounting positions of the X-axis hall chip 45 and the Y-axis hall chip 46 are as close to the X-axis magnet 31 and the Y-axis magnet 32 as possible; for example, in the space inside the ring of the X-axis drive coil 42 and the Y-axis drive coil 43.

The frame 36, the X-axis magnet 31, the Y-axis magnet 32, the FPC33, the Z-axis driving coil 331, the Z-axis hall chip 332, and the magnetic attraction piece 35 constitute a frame unit 3. The lower end of the return spring 5 is connected with a connecting piece embedded in the base; the upper end is connected with a connecting piece embedded in the frame 36; a connection to direct a control current to the frame 36; then is connected with an FPC33 input interface which is pasted on the outer side wall of the frame 36 in a welding way through a connecting piece; the Z-axis driving coil 331 obtains a driving current from the FPC 33. The Z-axis hall chip 332 takes power from the FPC33 and transmits a feedback signal through the FPC 33. In order to avoid the interference of the Z-axis magnet 22, the Z-axis hall chip 332 and the Z-axis hall magnet 25 should be as far away from the Z-axis magnet 22 as possible.

In order to reduce interference between the Z-axis magnet 22 and the X-axis and Y-

axis magnets

31 and 32, a magnet shielding sheet 34 is attached to the bottom of the frame 36. The Z-axis magnet 22 is arranged in a trapezoid shape with the upper end surface and the lower end surface inclined outwards; the magnetic field is deflected outward and away from the X-axis magnet 31 and the Y-axis magnet 32, which is also advantageous in reducing interference between the Z-axis magnet 22 and the X-axis magnet 31 and the Y-axis magnet 32.

The carrier 21, the Z-axis magnet 22, and the Z-axis hall magnet 25 constitute a carrier unit 2. The Z-axis drive coil 331 drives the Z-axis magnet 22 to move along the Z-axis. The Z-axis hall magnet 25 feeds back the Z-axis displacement through the Z-axis hall chip 332. The magnetic attraction piece 35 fixed on the side wall of the frame 36 attracts the Z-axis hall magnet 25, so that the carrier 21 is close to the magnetic attraction piece 35.

As shown in fig. 5, two sets of guiding balls 24 are mounted in the ball receiving grooves of the frame 36, and the carrier 21 is provided with guiding columns 23; when the carrier 21 is moved toward the magnetic attraction piece 35, the guide posts 23 are brought into close contact with the guide balls 24. When the carrier 21 moves along the Z-axis relative to the frame 36, the guide balls 24 and the guide posts 23 are in rolling friction, and the friction force is small.

The anti-shake motor is characterized in that a sliding mechanism is arranged between the frame and the base, so that the frame is connected with the base in a sliding manner; the limitation of a suspension wire scheme is avoided, and the XY axis plane can realize the correction amplitude of 3 degrees; meanwhile, the Z-axis movement does not need to overcome the elasticity of an upper spring and a lower spring of a conventional AF motor, the drive coil is short in power-on circuit, few in welding points and more stable in structure, and the Z-axis rolling drive only needs to overcome smaller drive resistance, so that the power consumption is low, and the large-thrust drive can be realized while the motor performance is improved.

The above examples are only for illustrating the present invention, and besides, there are many different embodiments, which can be conceived by those skilled in the art after understanding the idea of the present invention, and therefore, they are not listed here.

Claims

1. An anti-shake motor includes a housing, a base, a frame, and a carrier for fixing a lens; the frame is connected with the base in a sliding mode, the shell is fixedly connected with the base, and the moving range of the frame is limited; and a return spring for guiding the frame to return to an initial position is arranged between the frame and the base.

2. The anti-shake motor according to claim 1, wherein the outer shape of the housing is rectangular; the return spring extends along the Z-axis direction and is arranged at four corners of the rectangle.

3. The anti-shake motor according to claim 1, wherein the top end surface of the base is provided with at least 3 ball grooves, the ball grooves are provided with balls, the bottom end surface of the frame is provided with a sliding plane matched with the balls, and the sliding plane is matched with the balls to realize sliding connection between the frame and the base.

4. The anti-shake motor according to claim 1, wherein a top end face of the base is provided with an X-axis drive coil and a Y-axis drive coil; and an X-axis magnet and a Y-axis magnet are respectively arranged at the positions of the bottom end surface of the frame corresponding to the X-axis driving coil and the Y-axis driving coil.

5. The anti-shake motor according to claim 1, wherein the frame is provided on an inner side thereof with a sliding support surface that supports the carrier to slide along the Z-axis; and an abutting mechanism for abutting the carrier against the sliding support surface.

6. The anti-shake motor according to claim 5, wherein the slide support surface is constituted by two Z-axis direction slide mechanisms.

7. The anti-shake motor according to claim 6, wherein the slide mechanism is composed of a guide post and two sets of balls arranged in the Z-axis direction.

8. The anti-shake motor according to claim 6, wherein the urging mechanism is composed of a Z-axis magnet on the carrier and a magnetic attraction piece fixed to the frame at a position corresponding to the Z-axis magnet.