WO2019218390A1

WO2019218390A1 - Anti-shake micro pan-tilt capable of driving camera module

Info

Publication number: WO2019218390A1
Application number: PCT/CN2018/088326
Authority: WO
Inventors: 麦练智
Original assignee: 高瞻创新科技有限公司
Priority date: 2018-05-18
Filing date: 2018-05-25
Publication date: 2019-11-21
Also published as: CN110500479A; CN110500479B

Abstract

Provided is an anti-shake micro pan-tilt capable of driving a camera module. The pan-tilt comprises a positioning base (6), a camera module carrier (4), at least one group of magnets (2), a magnet carrier (1), at least one group of independent coils (3), at least one group of elastic components (5), and a circuit board (7), wherein the independent coils (3) are fixed to the positioning base (6), and the independent coils (3) are also electrically connected to the circuit board (7); the positioning base (6), the independent coils (3) and the circuit board (7) form an immovable structure; the camera module carrier (4) is fixedly connected to the magnet carrier (1), and the magnets (2) are mounted on the magnet carrier (1); the camera module carrier (4), the magnet carrier (1) and the magnet (2) form a movable structure; and the immovable structure, the movable structure and the elastic components (5) form an elastic component vibrator system having a multi-axis rotational degree of freedom. The anti-shake micro pan-tilt solves the problem in the art of relative movement between an optical component and an image sensor and between a magnet in an actuator and a magnet in the pan-tilt, image shaking and increased power consumption.

Description

Anti-shake micro pan/tilt head capable of driving camera module

Technical field

The invention belongs to the technical field of anti-shake and pan/tilt, and particularly relates to an anti-shake micro-cloud platform capable of driving a camera module.

Background technique

In recent years, mobile devices with fixed-focus, wide-angle (over 80-degree viewing angle) shooting functions have become popular, and their applications have expanded, including aerial photography, motion cameras, and driving recorders. When taking pictures and making movies, it is likely to be blurred or shaken by external vibrations, affecting the quality of photos and videos. This problem is exacerbated when the vibration is intense or in low light conditions.

In order to solve the above problems, many existing anti-shake techniques have appeared on the market. The prior art described in the prior art calculates vibration waveforms and required compensation angles by reading vibration sensors (for example, gyroscopes and acceleration sensors), and compensates for image blur and sway caused by vibration by electronic, optical, or mechanical methods. Achieve improved image quality.

The prior art is classified into three categories according to the vibration compensation method, including an Electronic Image Stabilizer (EIS), an Optical Image Stabilizer (OIS), and a Gimbal Stabilizer (GS). EIS, OIS, and GS each have advantages and disadvantages.

EIS is an electronic method that achieves an anti-shake effect. At the time of shooting, the EIS adjusts the position of each frame of image according to the calculated vibration waveform to counteract the image shake caused by the vibration. Since the EIS does not require additional actuators, the main advantage of the EIS is its low cost and no additional weight and volume.

OIS is an optical and mechanical method that uses an actuator to move an optical component (which can be a piece of a camera, a set or all of the lenses) to achieve relative motion between the optical component and the image sensor, changing the optical path and The image circle position compensates for image shake caused by vibration. Because OIS continuously compensates for each frame of image, it can offset the jitter of each frame of image exposure, which can achieve better image quality than EIS.

The GS is a mechanical method that drives the entire camera module including the lens and the image sensor to make a motion that is opposite to the vibration direction but with an amplitude close to the vibration caused by the vibration. In the anti-shake process, since there is no relative motion between the optical component and the image sensor, the image quality and anti-shake effect do not drop at the edge of the image, and there is no need for the partial optical resolution of the anti-shake lens and the image. Partial resolution of the sensor. Therefore, the anti-shake effect and image quality of GS have advantages over EIS and OIS, which are more prominent in wide-angle camera modules.

The main disadvantage of EIS is that it cannot compensate for image sloshing in each frame. This is because EIS compensates for image sway caused by vibration by adjusting the position of each frame of image. Therefore, the image taken after the EIS is turned on is more likely to be blurred by the image shake.

Another disadvantage of EIS is that it sacrifices the resolution of the image sensor. When the EIS is turned on, the image sensor or image processor needs to crop the appropriate image as the final image by calculating the vibration waveform. During the cropping process, the resolution will decrease and the final image will be lower than the maximum resolution of the image sensor. Therefore, EIS sacrifices the maximum resolution of the image sensor and reduces the image quality.

Relative to EIS, the main disadvantage of OIS is the need for additional actuators, which requires higher extra costs, greater extra space, and higher extra weight.

Relative to GS, the main disadvantage of OIS is that it sacrifices part of the optical resolution of the lens. During the OIS process, the position of the image circle on the image sensor will constantly change. In order to prevent the imaging circle from exceeding the image sensor during the OIS process, the imaging circle must be enlarged by OIS, but this wastes the resolution that the lens should have. On the other hand, in the OIS process, when the position of the imaging circle is relatively biased, the edge of the imaging circle will be closer to the image sensor. Since most of the lenses have sharper edges and distortions than the center, the image resolution and anti-shake effect of OIS are generally less than GS. This problem is more obvious in wide-angle camera modules.

Although the image quality and anti-shake effect of GS has obvious advantages over OIS and EIS, GS requires an actuator that can drive the entire camera module. Since the weight and size of the camera module are much larger than the lens, the cost, weight, volume and power consumption of the existing GS actuator are usually high, which is not suitable for small mobile devices, or can reduce the battery life of the mobile device. time.

The mainstream GS technology uses ball bearings or other frictional contact points as a mechanical support structure between the fixed and movable parts. Since the frictional force of the support structure and the speed of the movable member are nonlinear, the support structure increases the nonlinear friction force, and the frictional force can affect the anti-shake effect. Especially when the vibration is relatively fine and the direction often changes, the effect will be more obvious.

However, the existing miniature GS does not use a frictional contact point, so that the disadvantages caused by the frictional force do not occur. However, since the camera module is integrated into the micro GS actuator, it may be necessary to modify the micro GS actuator design when replacing camera module parts (such as lenses and image sensors), reducing the actuator Compatibility and increased cost of changing parts. In addition, the miniature GS does not support electromagnetic force autofocus and zoom actuators, limiting the range of applications. Electromagnetic force actuators (the most common type of actuator; for example, voice coil motors and brushless motors) use the electromagnetic force generated by magnets and coils to push the lens components for autofocus or zoom. Finally, when the camera module is defective (for example, the image sensor is defective), the entire actuator also needs to be scrapped, which increases the production cost.

In the prior art, there is relative movement between the optical component and the image sensor, resulting in low image quality and an anti-shake effect. Furthermore, the electromagnetic force actuator (for example, the self-aligning focus actuator) in the existing camera module has a relative motion with the magnet, so that there is a magnet between the electromagnetic force actuator and the magnet in the gimbal. Interacting with each other, affecting the anti-shake effect and increasing power consumption, is extremely detrimental to the micro-cloud.

Summary of the invention

The invention provides an anti-shake micro-cloud platform capable of driving a camera module to solve the relative movement between the optical component and the image sensor in the prior art, the magnet in the actuator and the magnet in the cloud platform, and the image anti-shake effect And increase the power consumption problem.

An embodiment of the present invention provides an anti-shake micro-cloud platform capable of driving a camera module, including a positioning base, a camera module carrier, at least one set of magnets, a magnet carrier, at least one set of independent coils, at least one set of elastic components, and a circuit board. The independent coil is fixed on the positioning base, and the independent coil is electrically connected to the circuit board, and the positioning seat, the independent coil, and the circuit board form a non-moving structure;

The camera module carrier is fixedly connected to the magnet carrier, the magnet is mounted on the magnet carrier, and the camera module carrier, the magnet carrier and the magnet form an active structure;

A preferred embodiment of the present invention further includes at least one set of elastic components, one end of the elastic component being coupled to the positioning base and the other end being coupled to the camera module carrier, the movable structure, the movable mechanism, and The resilient assembly forms a resilient component vibration subsystem having multi-axis rotational freedom.

According to a preferred mode of the present invention, the positioning base is provided with four independent coil plates distributed in a rectangular shape, and the independent coil plate is provided with a boss for mounting the coil.

As a preferred mode of the present invention, the camera module carrier is rectangular, and a first protrusion is disposed at two ends of each side thereof;

The camera module carrier is located in a region limited by the four independent coil plates.

As a preferred mode of the present invention, the magnet carrier is composed of four carrier plates which are connected to each other and are in one-to-one correspondence with the independent coil plates, and the upper side and the two side edges of the carrier plate are provided with a function for blocking the movement of the magnet. In the flanged structure, the lower side of the magnet carrier is provided with a second protrusion.

As a preferred mode of the present invention, the material for forming the magnet carrier is a magnetic conductive material.

In a preferred embodiment of the present invention, the circuit board includes a first rigid circuit board and a first flexible circuit board, and at least one of the opposite corners of the first rigid circuit board is connected with a stripe of the first flexible circuit board. The first flexible circuit board is further provided with a first socket;

The first rigid circuit board is provided with a vibration sensor and an anti-shake control chip.

As a preferred mode of the present invention, the camera module carrier is connected to the camera module.

As a preferred mode of the present invention, the camera module includes a lens, an autofocus actuator, and a camera module circuit board, the three are connected to each other as a whole, and the camera module circuit board includes a second rigid circuit board, a three rigid circuit board and a second flexible circuit board;

The second rigid circuit board is rectangular, and a second flexible circuit board is connected to each other at at least one opposite corner thereof, and a third rigid circuit board is disposed at an end of the second flexible circuit board. A second socket is also connected to the three rigid circuit boards.

As a preferred mode of the present invention, the first socket and the second socket are connected.

As a preferred mode of the invention, the elastic component is a serpentine elastic component.

The invention has the beneficial effects that the positioning seat, the independent coil and the circuit board form a non-moving structure, the camera module carrier, the magnet carrier and the magnet form an active structure, and the camera module is driven by the ampere force generated by the energized independent coil in the magnetic field. The group carrier motion, combined with the anti-shake control chip to control the current direction of the independent coil, achieves the vibration interference during the shooting to eliminate the blur of the image and improve the quality of the image or film. The contact point of the support structure of the invention does not have a frictional contact point, and no nonlinear friction force occurs during the anti-shake process, and the effect of the vibration which is relatively fine and often changes direction is better. Moreover, it does not require a complicated mechanical transmission structure, so it has the advantages of simple and compact structure, convenient assembly, small size, light weight, low cost and low power consumption, and is advantageous for mass production and application.

In addition, the structure of the present invention is that the magnet moves and the coil does not move, so that the problem of mutual interference between the magnet in the electromagnetic force-type autofocus actuator and the magnet in the gimbal does not occur, and the anti-shake effect is not increased. Power consumption is extremely suitable for applications in microactuators.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

1 is a development view of a structure of an embodiment of the present invention;

2 is a partial structural diagram of a gimbal according to an embodiment of the present invention;

3 is a structural diagram of a circuit board according to an embodiment of the present invention;

4 is a partial structural diagram of a camera module according to an embodiment of the present invention;

FIG. 5 is a structural diagram of a positioning seat according to an embodiment of the present invention; FIG.

FIG. 6 is a structural diagram of a camera module carrier according to an embodiment of the present invention; FIG.

Figure 7 is a structural view of a magnet carrier according to an embodiment of the present invention.

Among them, 1, magnet carrier, 2, magnet, 3, independent coil, 4, camera module carrier, 5, elastic components, 6, positioning seat, 7, circuit board, 8, first flexible circuit board, 9, first Rigid circuit board, 10, anti-shake control chip, 11, vibration sensor, 12, first socket, 13, lens, 14, actuator, 15, second flexible circuit board, 16, third rigid circuit board, 17, a second socket, 18, a second rigid circuit board, 19, a separate coil plate, 20, a boss, 21, a first protrusion, 22, a second protrusion, 23, a carrier plate.

Detailed ways

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

The embodiment of the invention discloses an anti-shake micro-cloud platform capable of driving a camera module. Referring to FIG. 1 to FIG. 7 , the invention comprises a positioning base 6 , a camera module carrier 4 , at least one set of magnets 2 , and a magnet carrier 1 . At least one set of independent coils 3, at least one set of elastic components 5, and a circuit board 7. The independent coil 3 is fixed on the positioning base 6, and the independent coil 3 is also electrically connected to the circuit board 7. The positioning base 6, the independent coil 3, and the circuit board 7 form a fixed structure; the camera module carrier 4 is fixedly connected with the magnet carrier 1. The magnet 2 is mounted on the magnet carrier 1, and the camera module carrier 4, the magnet carrier 1, and the magnet 2 constitute an active structure. Further comprising at least one set of elastic components 5, the elastic component 5 may be a serpentine spring, the elastic component 5 is inclined and symmetrically distributed in the same vertical plane, one end of the elastic component 5 is connected with the positioning seat 6, and the other end is connected with the camera module. The group carrier 4 is connected, and the stationary structure, the movable mechanism and the elastic assembly 5 form an elastic component vibration subsystem having a multi-axis rotational freedom. When the independent coil 3 is energized, it is subjected to the ampere force, and the camera module can be driven by the ampere force to rotate around the axis of the camera module. By changing the current and direction of each set of coils, the magnetic field torque can be changed to achieve the rotation of the camera module around the axis of the elastic assembly. The axis of the elastic component vibration system does not shift during the movement or other external force acts on the movable structure. When the rotation of the camera module carrier 4 relative to the stationary structure and the direction of the external rotation vibration are opposite, but the amplitude is close, It can offset the vibration and achieve at least one axis of anti-shake effect, reducing the quality of images and images caused by vibration. When the independent coil is de-energized, the Ampere force disappears and the elastic component vibration subsystem can be reset.

The positioning seat 6 is a carrier carrying other components of the present invention, and includes a rectangular bottom structure. The bottom structure is provided with a groove structure for carrying conductive lines during assembly and a buckle for connection, and 4 verticals are also provided. The independent coil plate 19 is disposed in a rectangular shape and is disposed in a rectangular shape. The independent coil plate 19 is provided with a boss 20 for mounting a coil, and the independent coil 3 is attached to the periphery of the boss 20.

The camera module carrier 4 is a rectangular body, and the body is located in a region restricted by the four independent coil plates 19, and the first protrusions 21 are provided at both ends of each side.

The magnet carrier 1 is composed of four carrier plates 23 which are connected to each other and are in one-to-one correspondence with the independent coil plates 19. The upper side and the two side edges of the carrier plate 23 are provided with a flange structure for blocking the movement of the magnet, and the lower side of the magnet carrier 1 is provided. The second protrusion 22 is connected to the magnet carrier 1 . Preferably, the material of the magnet carrier 1 is a magnetic conductive material, and the magnet and the magnet carrier are integrally fixed by magnetic force, which can facilitate the assembly of the magnet and simplify the mechanical structure of the magnet carrier 1.

The first protrusion 21 of the camera module carrier 4 is used to engage the magnet carrier 1 on the one hand, and to connect the elastic component 5 on the other hand, to realize the connection of the elastic component 5 and the positioning seat 6, which can simplify the structure of the invention and further improve The assembly process of the present invention.

In another embodiment based on the above embodiment, the camera module is connected to the camera module carrier 4, and the camera module and the actuator are integrally connected to form a miniature cloud platform with a camera module.

The circuit board 7 includes a first rigid circuit board 9 and a first flexible circuit board 8, and a stripe-shaped first flexible circuit board 8 is connected to opposite corners of the first rigid circuit board 9, on the first flexible circuit board 8. A first socket 12 is further disposed. The first rigid circuit board 9 is provided with a vibration sensor 11 and an anti-shake control chip 10. The anti-shake control chip 10 reads the vibration sensor 11, calculates a vibration signal, and outputs a required control signal. The current and direction of the independent coil 3 are changed to achieve an anti-shake effect.

The camera module includes a lens 13, a brake 14 and a camera module circuit board. The three are connected to each other as a whole. The camera module circuit board includes a second rigid circuit board 18, a third rigid circuit board 16, and a second flexible circuit board 15. . The second rigid circuit board 18 has a rectangular shape, and a stripe-shaped second flexible circuit board 15 is connected to each other at opposite corners thereof, and a third rigid circuit board 16 is disposed at the end of the second flexible circuit board 15, the third rigidity A second socket 17 is also connected to the circuit board 16, and the first socket 12 and the second socket 17 are connected. In order to provide the movable structure and the camera module with the freedom required for their movement, a flexible circuit board is provided on both the circuit board and the camera module circuit board.

In the assembly of the present invention, the camera module can be connected to the camera module carrier of the pan/tilt head, and a casing is provided on the periphery of the camera module and the pan/tilt head, and the casing is connected with the card position on the positioning seat 6, and is dropped. The separation of the outer casing and the pan/tilt can be avoided in the tensile reliability test. This structure assembly process is simple, easy to produce and post-maintenance, so the price of the product and the maintenance cost can be greatly reduced. In addition, the present invention is that the magnet 2 moves and the coil does not move, so that the problem of mutual interference between the magnet in the electromagnetic force actuator and the magnet 2 in the pan/tilt does not occur, and the anti-shake effect is not affected, and power consumption is not increased. Extremely suitable for applications in microactuators.

In the present invention, the magnet arrangement may include two sets of magnets 2, each set of magnets 2 being composed of two pairs of magnets 2, each pair of magnets 2 being disposed on any pair of opposite carrier plates 23 of the magnet carrier 1, each pair of magnets 2 being composed of two pieces The magnets 2 having the opposite magnetic field directions are arranged side by side in the upper and lower directions, and also include the independent coil 3 and the elastic member 5 which are the same as the logarithm of the magnet 2 and which are disposed corresponding to the magnet 2. By adjusting the current direction and size of the two independent coils 3, the two-axis anti-shake effect can be achieved.

On the basis of the two sets of magnets, three sets of magnets 2 may be included, wherein the magnets 2 of the two sets of magnets 2 are arranged side by side in the upper and lower directions, and the other set of magnets 2 are arranged side by side and arranged side by side. The direction and size of the independent coil 3 current can achieve the three-axis anti-shake effect.

In order not to affect the normal operation of the independent coil 3 and the circuit board 7, the material of the positioning seat 6 is made of a non-conductive material.

In order to reduce the high-frequency electromagnetic wave interference of the external components and external components of the gimbal on the image sensor, the material of the outer casing is a material capable of shielding high-frequency electromagnetic waves.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

Claims

An anti-shake micro-cloud platform capable of driving a camera module, comprising: a positioning seat, a camera module carrier, at least one set of magnets, a magnet carrier, at least one set of independent coils, at least one set of elastic components, and a circuit board, The independent coil is fixed on the positioning base, the independent coil is also electrically connected to the circuit board, and the positioning seat, the independent coil and the circuit board form a non-moving structure;

The camera module carrier is fixedly connected to the magnet carrier, the magnet is mounted on the magnet carrier, and the camera module carrier, the magnet carrier and the magnet form an active structure;

Further comprising at least one set of elastic components, one end of the elastic component being coupled to the positioning seat and the other end being coupled to the camera module carrier, the stationary structure, the movable mechanism and the elastic component forming one having Elastic component vibration subsystem with multi-axis rotational freedom.
The anti-shake micro-cloud platform capable of driving a camera module according to claim 1, wherein the positioning base is provided with four independent coil plates distributed in a rectangular shape, and the independent coil plate is provided for mounting. The boss of the coil.
The anti-shake micro-cloud platform capable of driving a camera module according to claim 2, wherein the camera module carrier is rectangular, and a first protrusion is disposed at two ends of each side thereof;

The camera module carrier is located in a region limited by the four independent coil plates.
The anti-shake micro-cloud platform capable of driving a camera module according to claim 3, wherein the magnet carrier is composed of four carrier plates connected to each other and corresponding to the independent coil plates, the carrier The upper side and the two side edges of the plate are provided with a flange structure for blocking the movement of the magnet, and the lower side of the magnet carrier is provided with a second protrusion.
The anti-shake micro-cloud platform capable of driving a camera module according to claim 1, wherein the magnet carrier is made of a magnetic conductive material.
The anti-shake micro-cloud platform capable of driving a camera module according to claim 1, wherein the circuit board comprises a first rigid circuit board and a first flexible circuit board, and the first rigid circuit board is at least opposite a strip of first flexible circuit board is connected to each corner, and the first flexible circuit board is further provided with a first socket;

The first rigid circuit board is provided with a vibration sensor and an anti-shake control chip.
The anti-shake micro-cloud platform capable of driving a camera module according to claim 6, wherein the camera module carrier is connected to the camera module.
The anti-shake micro-cloud platform capable of driving a camera module according to claim 7, wherein the camera module comprises a lens, a brake and a camera module circuit board, and the three are connected to each other as a whole, the camera The module circuit board includes a second rigid circuit board, a third rigid circuit board, and a second flexible circuit board;

The second rigid circuit board is rectangular, and a second flexible circuit board is connected to each other at at least one opposite corner thereof, and a third rigid circuit board is disposed at an end of the second flexible circuit board. A second socket is also connected to the three rigid circuit boards.
The anti-shake micro-cloud platform capable of driving a camera module according to claim 8, wherein the first socket and the second socket are connected.
The anti-shake micro-cloud platform capable of driving a camera module according to claim 1, wherein the elastic component is a serpentine elastic component.