WO2023005040A1

WO2023005040A1 - Anti-shake motor

Info

Publication number: WO2023005040A1
Application number: PCT/CN2021/127713
Authority: WO
Inventors: 龚高峰; 王建华; 朱春明
Original assignee: 上海比路电子股份有限公司; 长汀县比路电子有限公司
Priority date: 2021-07-29
Filing date: 2021-10-29
Publication date: 2023-02-02
Also published as: CN113515001A

Abstract

An anti-shake motor, comprising a casing (1), a base (47), a frame (36), and a carrier (21) for fixing a lens. The frame (36) is slidably connected to the base (47), and the casing (1) is fixedly connected to the base (47), to limit the moving range of the frame (36); return springs (5) for guiding the frame (36) to return to an initial position are provided between the frame (36) and the base (47). By providing sliding mechanisms between the frame (36) and the base (47), the frame (36) is slidably connected to the base (47); restriction of a suspension solution is avoided, and an XY axis plane can achieve a correction amplitude of 3 degrees.

Description

anti-shake motor

technical field

The invention relates to an anti-shake motor, which is used for anti-shake of cameras of portable devices such as mobile phones and notebook computers.

Background technique

Recently, high-performance lens drive devices have been installed in portable terminal devices such as portable cameras, smartphones, and tablet PCs. These lens driving devices generally have autofocus and anti-shake functions. The anti-shake feature reduces blur caused by external vibrations or the shaking of the user's hand.

In an existing lens driving device with an anti-shake function, in order to realize automatic focusing, the focusing coil is energized to drive the lens up and down along its optical axis. However, in these lens driving devices, in order to introduce the current from the outside of the lens module to the focusing coil, suspension wires are generally required. The suspension wires rely on elastic restoring force to prevent shaking, thereby prompting the lens driving device to quickly return to the original position. Therefore, the suspension wires The role in the lens drive device includes: circuit connection, carrying the lens and AF motor, and elastic shaking for anti-shake correction. The problems with the suspension wire are: when the heavy lens is loaded, the anti-shake correction range of the suspension wire is small, At the same time, the suspension wire is also easy to bend and deform, and the solder joints at both ends of the suspension wire are easy to loosen, which in turn affects the stability of the motor circuit connection and the accuracy of the anti-shake correction.

Contents of the invention

The purpose of the present invention is to provide an anti-shake motor with a novel and unique structure, easy to use, and can effectively improve the anti-shake performance; the specific technical solution is:

An anti-shake motor, comprising a housing, a base, a frame and a carrier for fixing lenses; the frame is slidably connected to the base, and the housing is fixedly connected to the base to limit the range of movement of the frame; There is a return spring to guide the frame back to its original position.

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

Further, at least three ball grooves are arranged on the top surface of the base, and balls are arranged in the ball grooves, and a sliding plane that cooperates with the balls is arranged on the bottom surface of the frame, and the sliding plane cooperates with the balls to realize The frame is slidably connected to the base.

Further, an X-axis drive coil and a Y-axis drive coil are provided on the top surface of the base; X-axis magnets and Y-axis magnets and Y-axis magnets are respectively provided on the bottom surface of the frame corresponding to the X-axis drive coil and the Y-axis drive coil. shaft magnet.

Further, the inside of the frame is provided with a sliding support surface that supports the sliding of the carrier along the Z axis; and an abutting mechanism that makes the carrier lean against the sliding support surface.

Further, the sliding support surface is composed of two sliding mechanisms in the Z-axis direction.

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

Further, the abutting mechanism is composed of a Z-axis magnet on the carrier and a magnetic attraction piece fixed on the frame corresponding to the position of the Z-axis magnet.

The anti-shake motor of the present invention provides a sliding mechanism between the frame and the base, so that the frame and the base are slidably connected; avoiding the restriction of the suspension wire scheme, the XY axis plane can achieve a correction range of 3 degrees; At the same time, the movement of the Z-axis does not need to overcome the elastic force of the upper and lower springs of the conventional AF motor. The drive coil has a short power circuit, fewer solder joints, and a more stable structure. It can achieve high-thrust drive while improving the performance of the motor.

Description of drawings

Fig. 1 is a schematic diagram of the appearance and structure of the anti-shake motor of the present invention;

[Correction 10.11.2021 under Rule 26]
Figure 2 is a schematic diagram of the structure of the base unit;

Fig. 3 is an exploded view of the structural schematic diagram of the anti-shake motor of the present invention;

Fig. 4 is a structural schematic diagram of a frame unit;

Fig. 5 is a schematic diagram of the structure of the carrier unit.

In the figure: 1. Shell; 2. Carrier unit; 21. Carrier; 22. Z-axis magnet; 23. Guide column; 24. Guide ball; 25. Z-axis Hall magnet; 3. Frame unit; 31. X-axis magnet ;32, Y-axis magnet; 33, FPC; 331, Z-axis driving coil; 332, Z-axis Hall chip; Base unit; 41. Sliding plane ball; 42. X-axis drive coil; 43. Y-axis drive coil; 44. Interface terminal; 45. X-axis Hall chip; 46. Y-axis Hall chip; 47. Base; 5. return spring.

Detailed ways

The present invention will be described more fully below using examples. This invention may 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," and "right" may be used herein to describe the relationship of one element or feature relative to another element or feature shown 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 orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative specifications used herein interpreted accordingly.

As shown in FIGS. 1 to 4 , the anti-shake motor in this embodiment includes a housing 1 , a base 47 , a frame 36 and a carrier 21 for fixing lenses; wherein, the frame 36 is slidably connected to the base 47 . Since the suspension wire is no longer used to connect the frame 36 and the base 47, when the X-axis drive coil 42 drives the X-axis magnet 31 or the Y-axis drive coil 43 drives the Y-axis magnet 32, the frame 36 can slide freely relative to the base 47, The resistance is small; it is no longer hindered by the suspension wire; the correction range is increased from 1 to 2 degrees of the general OIS motor to 3 degrees. Naturally, it also solves the problems of easy bending and deformation caused by hanging wires, and easy loosening of solder joints at both ends.

Because described shell 1 is fixedly connected with base 47, can limit the range of movement of frame, avoids frame beyond the controllable range of coil; Be provided with the back-moving spring 5 that is used to guide frame 36 to return to original position between frame 36 and base 47; Make not need During the anti-shake operation, the frame 36 is at the initial position at the center of the base 47, and the anti-shake range can be balanced in all directions.

The shape of the housing is set as a rectangle, which is beneficial to the miniaturization of the product, and is also convenient for processing and use; at this time, the return spring 5 can be arranged at the four corners of the rectangle. The return spring 5 can be set to extend along the Z-axis direction, which is beneficial to product miniaturization. Of course, the return spring 5 can also be inclined inwardly or outwardly; it only needs to pull the frame 36 back to the initial position at the center of the base 47 when the X-axis driving coil 42 and the Y-axis driving coil 43 are not powered. The location will do. The outer shape of the outer shell can be cylindrical or hexagonal; when the outer shell is in other shapes, the return springs 5 are evenly distributed along the outer edge of the outer shell.

As shown in Figure 2, at least 3 ball grooves are arranged on the top surface of the base, and sliding plane balls 41 are arranged in the ball grooves, and the fixed points of all the sliding plane balls 41 form a sliding support plane; Friction when the frames slide relative to each other. The bottom end surface of the frame is provided with a sliding plane that cooperates with the balls, and the sliding plane cooperates with the sliding plane balls 41 to realize the sliding connection between the frame and the base. This sliding connection mechanism has a simple structure, can realize a large compensation angle, and at the same time has more precise displacement control, higher sensitivity, and stronger reliability. Wherein, the installation 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 rolled as much as possible in the installation groove, and the sliding movement of the sliding plane ball 41 in the installation groove is reduced. An existing sliding mechanism can also be used to realize the sliding connection between the frame 36 and the base 47 . For example: two sets of slide rails and sliders constitute a sliding platform in the X-axis direction; a combination of two sets of slide rails and sliders constitutes a sliding platform in the Y-axis direction to form a free sliding in the XY direction; or the frame 36 is suspended on the base by the repulsive force of the permanent magnet 47 above.

An X-axis driving coil and a Y-axis driving coil can be arranged on the top surface of the base; X-axis magnets and Y-axis magnets and Y-axis magnets can be respectively arranged on the bottom surface of the frame corresponding to the X-axis driving coil and the Y-axis driving coil. magnet. The X-axis driving coil and Y-axis driving coil that need to be powered are installed on a fixed base; the X-axis magnets and Y-axis magnets that do not need to be powered are installed on a movable frame, which is beneficial to reduce the failure rate of the product.

In order to reduce resistance, the carrier 21 sleeved in the frame 36 and the frame 36 must be clearance fit. In order to further reduce the resistance, a sliding support surface for supporting the sliding of the carrier 21 along the Z-axis is provided on the inside of the frame 36 ; at the same time, an abutting mechanism for making the carrier lean against the sliding support surface is also provided. The abutment mechanism ensures that when the carrier 21 slides along the Z axis, it is always in contact with the sliding support surface, and the sliding support surface is used to the greatest extent to reduce resistance.

The sliding support surface is composed of two sliding mechanisms in the Z-axis direction. The sliding mechanism can be made up of sliders and guide rails.

As shown in Figure 4 (for convenience, the frame unit 3 has been rotated 180 degrees around the Z axis), the sliding mechanism can also be made up of guide columns 23 and two groups of guide balls 24 arranged along the Z axis direction; It is beneficial to reduce the friction force of the sliding mechanism. Two adjacent corners of the frame 36 are provided with ball receiving grooves 37 , and each set of guide balls 24 has at least two balls. Direct contact with adjacent balls in the Z-axis direction should be avoided, resulting in increased resistance. A transition ball is set between two adjacent guide balls 24, and the diameter of the transition ball is smaller than the diameter of the support ball; the guide ball 24 is in contact with the guide column 23, and the rolling direction is the same, which is opposite to the rolling direction of the transition ball, which is conducive to reducing friction , that is, the driving resistance is small, which is conducive to reducing the power consumption of the motor and realizing high-thrust driving; and it is not necessary to deepen the depth of the accommodation groove of the guide ball 24 .

The abutment mechanism is composed of the Z-axis magnet 22 on the carrier and the magnetic attraction piece 35 fixed on the frame 36 corresponding to the position of the Z-axis magnet 22 . The magnetic attraction piece 35 is attracted to the Z-axis magnet 22, so that when the carrier 21 slides along the Z-axis, it is always in contact with the sliding support surface. Of course, magnets with opposite magnetic properties can also be used to push the far Z-axis magnet 22 .

During operation, the base 47 , the X-axis driving coil 42 , the Y-axis driving coil 43 , the X-axis Hall chip 45 and the Y-axis Hall chip 46 constitute the base unit 4 . The interface terminal 44 provided at the bottom of the base unit 4 introduces the current of the control coil, outputs a Hall signal for feeding back the offset positions of the X-axis magnet 31 and the Y-axis magnet 32 , and provides power for the Hall chip. Both the X-axis driving coil 42 and the Y-axis driving coil 43 are two coils; providing greater driving force; the two coils are arranged diagonally, staggered with the X-axis magnet 31 and the Y-axis magnet 32 below, which is beneficial to reduce the Z-axis The interference between the magnet 22 and the X-axis magnet 31 and the Y-axis magnet 32; and the installation space is increased, a larger driving coil can be installed, and it is also beneficial to provide a greater driving force. Correspondingly, the sliding plane balls 41 are installed on the four sides. The installation positions of the X-axis Hall chip 45 and the Y-axis Hall chip 46 are as close as possible to the X-axis magnet 31 and the Y-axis magnet 32 ;

The frame unit 3 is composed of the frame 36 , the X-axis magnet 31 , the Y-axis magnet 32 , the FPC 33 , the Z-axis drive coil 331 , the Z-axis Hall chip 332 and the magnetic sheet 35 . The lower end of the return spring 5 is connected with the connector embedded in the base; the upper end is connected with the connector embedded in the frame 36; the control current is led to the connector of the frame 36; The FPC33 input interface is welded and connected; the Z-axis driving coil 331 obtains the driving current from the FPC33. The Z-axis Hall chip 332 obtains power from the FPC33, and transmits a feedback signal through the FPC33. In order to avoid interference from 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 the interference between the Z-axis magnet 22 , the X-axis magnet 31 and the Y-axis magnet 32 , a magnetic blocking sheet 34 is installed at the bottom of the frame 36 . The Z-axis magnet 22 is set in a trapezoid whose upper and lower ends are inclined outward; the magnetic field is biased to the outside, away from the X-axis magnet 31 and the Y-axis magnet 32, which also helps to reduce the distance between the Z-axis magnet 22 and the X-axis magnet 31 and Y-axis magnet 32. Interference between.

The carrier 21 , the Z-axis magnet 22 and the Z-axis Hall magnet 25 constitute the carrier unit 2 . The Z-axis driving 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 is attracted to the Z-axis Hall magnet 25 , so that the carrier 21 is close to the side of the magnetic attraction piece 35 .

As shown in Figure 5, two groups of guide balls 24 are installed in the ball receiving groove that frame 36 is provided with, and carrier 21 is provided with guide column 23; Close contact. When the carrier 21 moves along the Z-axis relative to the frame 36, the guide ball 24 and the guide post 23 have rolling friction, and the friction force is very small.

The anti-shake motor of the present invention provides a sliding mechanism between the frame and the base, so that the frame and the base are slidably connected; avoiding the restriction of the suspension wire scheme, the XY axis plane can achieve a correction range of 3 degrees; At the same time, the Z-axis movement does not need to overcome the elastic force of the upper and lower springs of the conventional AF motor, the drive coil has a short power circuit, fewer solder joints, and a more stable structure. The Z-axis rolling drive only needs to overcome a small driving resistance, so the power consumption is low. , while improving the performance of the motor, it can realize high-thrust drive.

The above examples are only used to illustrate the present invention. In addition, there are many different implementations, and these implementations can be thought of by those skilled in the art after comprehending the ideas of the present invention. List them all.

Claims

An anti-shake motor, comprising a shell, a base, a frame and a carrier for fixing the lens; it is characterized in that the frame is slidably connected to the base, and the shell is fixedly connected to the base to limit the range of movement of the frame; the frame and A return spring for guiding the frame to return to the initial position is arranged between the bases.
The anti-vibration motor according to claim 1, characterized in that, the shape of the housing is rectangular; the return spring extends along the Z-axis direction and is arranged at four corners of the rectangle.
The anti-shake motor according to claim 1, wherein at least three ball grooves are arranged on the top surface of the base, balls are arranged in the ball grooves, and a bottom surface of the frame is arranged to cooperate with the balls. The sliding plane is matched with the ball to realize the sliding connection between the frame and the base.
The anti-shake motor according to claim 1, wherein the top surface of the base is provided with an X-axis driving coil and a Y-axis driving coil; the bottom surface of the frame is connected with the X-axis driving coil and the Y-axis driving coil. X-axis magnets and Y-axis magnets are respectively arranged at corresponding positions of the axis driving coils.
The anti-shake motor according to claim 1, characterized in that, the inside of the frame is provided with a sliding support surface that supports the sliding of the carrier along the Z axis; and a supporting mechanism that makes the carrier lean against the sliding support surface .
The anti-vibration motor according to claim 5, wherein the sliding support surface is composed of two sliding mechanisms in the Z-axis direction.
The anti-shake motor according to claim 6, wherein the sliding mechanism is composed of a guide column and two groups of balls arranged along the Z-axis direction.
The anti-shake motor according to claim 6, wherein the abutting mechanism is composed of a Z-axis magnet on the carrier and a magnetic attraction piece fixed on the frame corresponding to the position of the Z-axis magnet.