CN110708452A

CN110708452A - Driving device for realizing automatic focusing and anti-shaking of camera

Info

Publication number: CN110708452A
Application number: CN201911097794.7A
Authority: CN
Inventors: 刘述伦; 陈林; 蔡日新
Original assignee: Dongguan Yadeng Electronics Co Ltd
Current assignee: Guangdong haideya Technology Co.,Ltd.
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2020-01-17
Also published as: CN114222052A

Abstract

The invention relates to a driving device for realizing automatic focusing and anti-shaking of a camera, which is provided with a support module and a moving part suitable for lens installation and assembly, wherein the moving part is assembled on the support module through a suspension system to realize that the moving part moves along the optical axis of a lens; the driving mechanism further comprises a first pair of driving modules and a second pair of driving modules which are driven based on the principle that the SMA wire is heated to shrink, and the driving moving parts of the first pair of driving modules and the second pair of driving modules move in opposite directions along the optical axis of the lens; and the single-side independent control driving of the first pair of driving modules and the second pair of driving modules realizes the angle control of the lens around the X axis and the Y axis, so as to achieve the inclination angle adjustment type optical anti-shake effect. The lens is driven to automatically focus by utilizing the characteristic that the SMA wire is heated and contracted, and the inclination angles of the lens around the X axis and the Y axis are adjusted by driving the lens to move at different sides, so that the optical anti-shake function is realized, and the use performance of the camera is improved. The product structure is light and handy and miniaturized, and control is simple and convenient, accurate.

Description

Driving device for realizing automatic focusing and anti-shaking of camera

Technical Field

The invention relates to the technical field of cameras, in particular to the technical field of camera focusing applied to portable electronic equipment such as mobile phones or tablet computers.

Background

With the development and popularization of portable electronic devices such as mobile phones and tablet computers, the requirement for the camera function attached to the portable electronic devices is relatively increased. In order to focus and zoom the camera, a driving device needs to be disposed in a narrow space of the camera to drive the lens to move along the optical axis. The space is small, which limits the types of drive mechanisms that can be used. In the camera in the prior art, the driving is mainly realized by using a magnet and coil structure, but the structure is relatively complex, the size is difficult to reduce, and the requirement of product miniaturization cannot be met.

Meanwhile, the micro automatic focusing camera is widely applied to products such as mobile phones, automobiles, unmanned planes, security monitoring, smart homes and the like. The common micro automatic focusing camera module is driven by a micro voice coil motor to drive a lens to move up and down in the direction of an optical axis, and the voice coil motor is driven to move through a control chip during photographing, so that the automatic focusing function is realized. When taking a picture or taking a picture, the camera lens can not keep absolutely steady because of the shake of people or other reasons, produces certain skew, and the focus and the light inlet amount of camera all can receive the influence this moment, and then influences the quality that the camera acquireed the image. Generally, such lens deflection occurs in a direction perpendicular to the optical axis, and the auto-focus voice coil motor can only drive the lens to move in the optical axis direction, so that the problem caused by such lens deflection cannot be solved. An optical anti-shake actuator is added on the basis of an automatic focusing voice coil motor to drive a lens to move in two directions vertical to an optical axis, so that the deflection of the lens can be compensated, and the camera is helped to acquire better image quality.

The real sense of the miniature optical anti-shake camera motor is a closed-loop control system, the gyroscope detects the shake parameters of the lens and feeds the shake parameters back to the camera module control chip, and the camera module control chip calculates the corrected angle or displacement according to the position information provided by the lens position sensor and sends an instruction to drive the anti-shake actuator to reach the specified position, so that the displacement deflection of the lens caused by shake is corrected, and better image quality is obtained by photographing or shooting.

In the prior art, the same method can be adopted in two directions perpendicular to the optical axis as driving the lens to move in the optical axis direction, that is, the method can be realized by adopting a miniature voice coil motor. The common miniature voice coil motor generates Lorentz magnetic force in a magnetic field by an electrified coil to drive the lens to move; however, to realize optical anti-shake, the lens needs to be driven in at least two directions, which means that a plurality of coils need to be arranged, and thus, the miniaturization of the whole structure is challenging. For this reason, the micro-actuator using the voice coil motor principle for optical anti-shake generally integrates a plurality of coils on one circuit board, which is called as FP coil, thereby solving the size problem of the optical anti-shake actuator. However, the micro vcm optical anti-shake actuator and the autofocus micro vcm are separate, and the lens is usually mounted in the autofocus micro vcm, and the lens is moved in a direction perpendicular to the optical axis, that is, the lens moves along with the autofocus micro vcm. Therefore, the assembly process of the micro optical anti-shake camera module is more difficult, the structural reliability of the whole micro motor is reduced, and the requirement of product miniaturization is difficult to meet.

Disclosure of Invention

The invention aims to provide a driving device for realizing automatic focusing and anti-shaking of a camera, which meets the miniaturization requirement of products, obtains better focusing performance for driving a lens to move along an optical axis and also realizes anti-shaking.

In order to achieve the purpose, the invention adopts the following technical scheme:

a drive device for realizing automatic focusing and anti-shake of a camera comprises a support module and a moving component suitable for lens installation and assembly, wherein the moving component is assembled on the support module through a suspension system which guides the moving component to move along an optical axis of the lens; the first pair of driving modules are symmetrically arranged on two opposite sides of the moving component, and the second pair of driving modules are symmetrically arranged on the remaining two opposite sides of the moving component; the first pair of driving modules and the second pair of driving modules are driven based on the principle that the SMA wire is heated to contract, the first pair of driving modules are provided with first driving arms for pushing the moving part to move along the optical axis of the lens, the second pair of driving modules are provided with second driving arms for pushing the moving part to move along the optical axis of the lens, and the driving moving parts of the first pair of driving modules and the second pair of driving modules are opposite in moving direction along the optical axis of the lens; and the single-side independent control driving of the first pair of driving modules and the second pair of driving modules realizes the angle control of the lens around the X axis and/or the Y axis, so as to achieve the inclination angle adjustment type optical anti-shake effect.

The single body of the first pair of driving modules comprises two first driving arms, a first SMA wire and two first conductive supports, the first conductive supports are fixed on the supporting module and electrically connected with the control system of the camera, the first conductive supports are provided with first elastic arms capable of opening and closing, the two first driving arms and the first SMA wire form a movable triangular relation, two ends of the first SMA wire are respectively connected with the first elastic arms on the two first conductive supports, one end of each first driving arm is connected with the first elastic arm corresponding to the first conductive support, and the other end of each first driving arm is hinged with the moving part; the single body of the second pair of driving modules comprises two second driving arms, a second SMA wire and two second conductive supports, the second conductive supports are fixed on the supporting module and electrically connected with a control system of the camera, second elastic arms capable of opening and closing are arranged on the second conductive supports, the two second driving arms and the second SMA wire form a movable triangular relation, two ends of the second SMA wire are respectively connected with the second elastic arms on the two second conductive supports, one end of each second driving arm is connected with the second elastic arm corresponding to the second conductive support, and the other end of each second driving arm is hinged with the moving part.

The suspension system further comprises an upper spring and a lower spring, wherein the upper spring and the lower spring are respectively connected between the upper end and the lower end of the moving part and the support module; the upper spring comprises an upper inner ring and a first flexible part led out from the periphery of the upper inner ring, the upper inner ring is fixedly connected with the upper end of the moving part, and the tail end of the first flexible part is fixedly connected with the support module; the lower spring comprises a lower inner ring and a second flexible part led out from the periphery of the lower inner ring, the lower inner ring is fixedly connected with the lower end of the moving part, and the tail end of the second flexible part is fixedly connected with the support module.

The supporting module is formed by overlapping a bottom plate and an upper seat, an upward convex column is arranged on the upper side of the upper seat, which is far away from the bottom plate, and the column is matched with a suspension system and is installed with a first pair of driving modules and a second pair of driving modules; and the hinge parts are respectively hinged with a first driving arm of the first pair of driving modules and a second driving arm of the second pair of driving modules.

The above scheme is further that the control system of the camera utilizes the resistance of the first SMA wire and/or the second SMA wire as feedback to realize closed-loop control on the movement of the lens.

In the above scheme, the two first drive arms and the first SMA wire form an isosceles triangle relationship, the two second drive arms and the second SMA wire also form an isosceles triangle relationship, the first SMA wire and the second SMA wire are the bottom side of the isosceles triangle, and the first SMA wire and the second SMA wire are arranged in a vertically staggered manner in the axial direction of the relative motion component.

In the above scheme, the two first driving arms are respectively integrally formed with the two first conductive supports; the two second driving arms are respectively and integrally formed with the two second conductive supports, and the first elastic arm and the second elastic arm are designed to be inverted relatively.

The invention utilizes the characteristic that an SMA (shape Memory alloys) wire is heated to shrink, is used for manufacturing a driving device of a camera module of a mobile phone or a tablet personal computer, can drive a lens to move up and down, realizes the automatic focusing function of the lens, and can adjust the inclination angles of the lens around an X axis and a Y axis by driving the movement of different sides of the lens, thereby realizing the OIS (optical anti-shake) function by adjusting the inclination angle of the lens and improving the use performance of the camera. The SMA wire body is small, the driving structure is effectively simplified, the requirement of product miniaturization is met, the product structure is light and compact, the manufacturing cost is reduced, and meanwhile, the control is simple, convenient and accurate, and the SMA wire body is suitable for popularization and utilization.

Description of the drawings:

FIG. 1 is a schematic structural diagram of a preferred embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a first pair of driving modules of the embodiment shown in FIG. 1;

FIG. 3 is a schematic structural diagram of a second pair of driving modules according to the embodiment of FIG. 1;

FIG. 4 is a schematic diagram of the moving parts of the embodiment of FIG. 1;

FIG. 5 is a schematic diagram of the support module of the embodiment of FIG. 1;

FIG. 6 is a schematic diagram of the upper spring structure of the embodiment of FIG. 1;

fig. 7 is a schematic view of the lower spring structure of the embodiment of fig. 1.

The specific implementation mode is as follows:

the conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to fig. 1 ~ 7, which is a schematic view of a preferred embodiment of the present invention, the present invention relates to a driving device for automatically focusing and preventing camera shake, which has a supporting module 1 and a moving component 2 suitable for lens mounting and assembly, and of course, a control system and a corresponding housing (not shown) inherent to the camera device, the housing covers the moving component 2 and other components, and has anti-collision and protection effects, the supporting module 1 is adapted to be mounted on a portable electronic device such as a mobile phone or a tablet computer, the moving component 2 is assembled on the supporting module 1 through a suspension system 3, the suspension system 3 guides the moving component 2 to move along the optical axis of the lens, a central assembly hole of the moving component 2 is reserved to satisfy lens element assembly, so that the moving component 2 and the lens element move integrally, and further, the driving module 4 and the driving module 5 are included, the first pair of driving modules 4 are symmetrically disposed on two opposite sides of the moving component 2, the driving module 5 is symmetrically disposed on two opposite sides of the moving component 2, the driving module 4 and the driving module 5 are disposed on two opposite sides of the moving component 2, and the driving module 5 is capable of driving module 2 and driving module 5 is capable of driving the lens driving module to move independently and to push the lens by using a driving module 4 and a driving module 5 with a driving module 5 driving module 4 having an adjusting function of driving module for driving the lens element to move along the lens by using a driving mechanism that the lens element is retracted by a lens element that the lens element retracted by a second pair of driving element that the lens element that is retracted by a second pair of a lens element, when the lens element, the lens element.

Referring to fig. 1, 2 and 3, in the present embodiment, the single body of the first pair of driving modules 4 includes two first driving arms 41, a first SMA wire 42 and two first conductive supports 43, and the first conductive supports 43 are fixed on the supporting module 1 and electrically connected to the control system of the camera. The first conductive support 43 is provided with an openable first elastic arm 431, the two first driving arms 41 and the first SMA wire 42 form a movable triangular relationship, two ends of the first SMA wire 42 are respectively connected with the first elastic arms 431 on the two first conductive supports 43, one end of each first driving arm 41 is connected with the first elastic arm 431 corresponding to the first conductive support 43, and the other end of each first driving arm 41 is hinged with the moving part 2. The single body of the second pair of driving modules 5 includes two second driving arms 51, a second SMA wire 52 and two second conductive supports 53, the second conductive supports 53 are fixed on the support module 1 and electrically connected to the control system of the camera, the second conductive supports 53 are provided with second elastic arms 531 capable of opening and closing, the two second driving arms 51 and the second SMA wire 52 form a movable triangular relationship, two ends of the second SMA wire 52 are respectively connected to the second elastic arms 531 on the two second conductive supports 53, one end of the second driving arm 51 is connected to the second elastic arm 531 corresponding to the second conductive support 53, and the other end of the second driving arm 51 is hinged to the moving part 2. The SMA wire (such as a nickel-titanium memory alloy wire) is in a martensite structure at normal temperature, and when the temperature is increased, the SMA wire can generate phase change, the martensite is converted into austenite, the length is shortened, and the resistance is reduced; when the temperature is lowered, the SMA wire undergoes a phase transition from austenite to martensite, the length thereof is increased, and the electric resistance thereof is increased. During the phase transformation, the temperature and strain of the SMA wire are not very linear, but its resistance is linear with strain over a certain temperature range. Therefore, the length of the SMA wire can be accurately controlled by controlling the resistance of the SMA wire, and the position and the moving distance of the driving device are calculated according to the resistance of the SMA wire. Therefore, the control system is used for electrifying and heating the first SMA wire 42 and/or the second SMA wire 52, the SMA wires can contract, the corresponding triangular relation is changed, the corresponding first driving arm 41 and/or the second driving arm 51 push the moving part 2 to move along the optical axis of the lens, the focusing and zooming of the camera are realized, and the moving part 2 can be stably and accurately driven to carry out focusing movement with the lens by utilizing the relative stability of the triangle. In this embodiment, the first pair of driving modules 4 are symmetrically disposed on two opposite sides of the moving component 2, the second pair of driving modules 5 are symmetrically disposed on the two remaining opposite sides of the moving component 2, and the driving moving components 2 of the first pair of driving modules 4 and the second pair of driving modules 5 move in opposite directions along the optical axis of the lens, so that when focusing is realized, different driving modules can be powered on by a control system of the camera to move on different sides of the moving component 2, thereby adjusting the inclination angles of the lens around the X axis and the Y axis, realizing the OIS (optical anti-shake) function by adjusting the inclination angle of the lens, and improving the usability of the camera.

Referring to fig. 1, 2 and 3, in this embodiment, the two first driving arms 41 and the first SMA wire 42 form an isosceles triangle relationship, and the two second driving arms 51 and the second SMA wire 52 also form an isosceles triangle relationship, where the first SMA wire 42 and the second SMA wire 52 are the bottom side of the isosceles triangle, and the first SMA wire 42 and the second SMA wire 52 are arranged in a vertically staggered manner and are horizontal with respect to the axial direction of the moving part 2, so that the structure is more stable in operation and more accurate in control. Further, the two first driving arms 41 are respectively integrally formed with the two first conductive supports 43, and the first driving arms 41 are integrally extended from the first elastic arms 431 of the first conductive supports 43; the two second driving arms 51 are respectively and integrally formed with the two second conductive supports 53, the second driving arms 51 are integrally extended from the second elastic arms 531 of the second conductive supports 53, the first elastic arms 431 and the second elastic arms 531 are designed in an inverted manner, the structure is optimized, the manufacture and the assembly are convenient, the first conductive supports 43 and the second conductive supports 53 are connected with a control system circuit of the camera through welding, the control system also utilizes the resistances of the first SMA wire 42 and the second SMA wire 52 as feedback to realize closed-loop control on the movement of the lens, and the movement deviation of the moving part 2 can be corrected by comparing the real-time resistance value with the target value, so that a closed-loop control system which takes the resistance of the SMA wire as a feedback variable is formed, and accurate control is obtained.

1 ~ 7, in this embodiment, the supporting module 1 is composed of a base plate 11 and an upper seat 12 stacked together, the upper side of the upper seat 12 facing away from the base plate 11 is provided with a column 121 protruding upward, the column 121 is adapted to a suspension system 3 and a first pair of driving modules 4 and a second pair of driving modules 5 are installed, the periphery of the moving member 2 is provided with a hinge 21, the hinge 21 is respectively hinged to a first driving arm 41 of the first pair of driving modules 4 and a second driving arm 51 of the second pair of driving modules 5 to form a driving kinematic pair, the suspension system 3 includes an upper spring 31 and a lower spring 32, the upper spring 31 and the lower spring 32 are respectively connected between the upper end and the lower end of the moving member 2 and the supporting module 1, the upper spring 31 includes an upper inner ring 311 and a first flexible portion 312 led out from the outer periphery of the upper inner ring 311, the upper inner ring 311 is fixedly connected to the upper end of the moving member 2, the end of the first flexible portion 312 is fixedly connected to the supporting module 1, the lower spring 32 includes a lower inner ring 321 and a second flexible portion 322 led out from the outer periphery of the lower ring 321, the lower ring 321 is fixedly connected to the moving member 2, the second flexible portion of the supporting module 2 is connected to a supporting module 2, the optical axis of the lens suspension module 2 is easily matched to facilitate the lens suspension module and the lens suspension module 2, and the optical axis, and the lens suspension module 2, and.

The invention utilizes the characteristic that an SMA (shape Memory alloys) wire is heated to shrink, is used for manufacturing a driving device of a camera module of a mobile phone or a tablet personal computer, can drive a lens to move up and down to realize the automatic focusing function of the lens, and can adjust the inclination angle of the lens around an X axis and/or a Y axis by driving the movement of different sides of the lens, thereby realizing the OIS (optical anti-shake) function by adjusting the inclination angle of the lens and improving the use performance of the camera. The SMA wire body is small, the driving structure is effectively simplified, the requirement of product miniaturization is met, the product structure is light and compact, the manufacturing cost is reduced, and meanwhile, the control is simple, convenient and accurate, and the SMA wire body is suitable for popularization and utilization.

While the preferred embodiments of the invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a realize camera auto focus and anti-shake's drive arrangement which characterized in that: the lens driving device comprises a support module (1) and a moving part (2) suitable for lens installation group, wherein the moving part (2) is assembled on the support module (1) through a suspension system (3), and the suspension system (3) guides the moving part (2) to move along the optical axis of a lens; the device also comprises a first pair of driving modules (4) and a second pair of driving modules (5), wherein the first pair of driving modules (4) are symmetrically arranged on two opposite sides of the moving component (2), and the second pair of driving modules (5) are symmetrically arranged on the remaining two opposite sides of the moving component (2); the first pair of driving modules (4) and the second pair of driving modules (5) are driven based on the principle that the SMA wire is heated to contract, the first pair of driving modules (4) are provided with first driving arms (41) to push the moving part (2) to move along the optical axis of the lens, the second pair of driving modules (5) are provided with second driving arms (51) to push the moving part (2) to move along the optical axis of the lens, and the driving moving parts (2) of the first pair of driving modules (4) and the second pair of driving modules (5) move in opposite directions along the optical axis of the lens; and the single-side independent control driving of the first pair of driving modules (4) and the second pair of driving modules (5) realizes the angle control of the lens around the X axis and/or the Y axis, thereby achieving the inclination angle adjustment type optical anti-shake effect.

2. The driving device for realizing automatic focusing and anti-shaking of the camera according to claim 1, wherein: the single body of the first pair of driving modules (4) comprises two first driving arms (41), a first SMA wire (42) and two first conductive supports (43), the first conductive supports (43) are fixed on the support module (1) and electrically connected with a control system of the camera, the first conductive supports (43) are provided with first elastic arms (431) capable of opening and closing, the two first driving arms (41) and the first SMA wire (42) form a movable triangular relation, two ends of the first SMA wire (42) are respectively connected with the first elastic arms (431) on the two first conductive supports (43), one end of each first driving arm (41) is connected with the corresponding first elastic arm (431) of the first conductive support (43), and the other end of each first driving arm (41) is hinged with the moving part (2); the single body of the second pair of driving modules (5) comprises two second driving arms (51), a second SMA wire (52) and two second conductive supports (53), the second conductive supports (53) are fixed on the support module (1) and electrically connected with a control system of the camera, second elastic arms (531) capable of opening and closing are arranged on the second conductive supports (53), the two second driving arms (51) and the second SMA wire (52) form a movable triangular relation, two ends of the second SMA wire (52) are respectively connected with the second elastic arms (531) on the two second conductive supports (53), one end of each second driving arm (51) is connected with the second elastic arm (531) corresponding to the second conductive support (53), and the other end of each second driving arm (51) is hinged with the moving part (2).

3. The driving device for realizing automatic focusing and anti-shaking of the camera according to claim 1, wherein: the suspension system (3) comprises an upper spring (31) and a lower spring (32), and the upper spring (31) and the lower spring (32) are respectively connected between the upper end and the lower end of the moving part (2) and the support module (1); the upper spring (31) comprises an upper inner ring (311) and a first flexible part (312) led out from the periphery of the upper inner ring (311), the upper inner ring (311) is fixedly connected with the upper end of the moving component (2), and the tail end of the first flexible part (312) is fixedly connected with the support module (1); the lower spring (32) comprises a lower inner ring (321) and a second flexible part (322) led out from the periphery of the lower inner ring (321), the lower inner ring (321) is fixedly connected with the lower end of the moving component (2), and the tail end of the second flexible part (322) is fixedly connected with the support module (1).

4. The driving device for realizing automatic focusing and anti-shaking of the camera according to claim 1, 2 or 3, wherein: the supporting module (1) is formed by overlapping a bottom plate (11) and an upper seat (12), an upward convex table column (121) is arranged on the upper side, deviating from the bottom plate (11), of the upper seat (12), and the table column (121) is matched with the suspension system (3) and is installed with the first pair of driving modules (4) and the second pair of driving modules (5); the side of the moving component (2) is provided with a hinge part (21), and the hinge part (21) is respectively hinged with a first driving arm (41) of the first pair of driving modules (4) and a second driving arm (51) of the second pair of driving modules (5).

5. The driving device for realizing automatic focusing and anti-shaking of the camera according to claim 2, wherein: the control system of the camera realizes closed-loop control on the movement of the lens by using the resistance of the first SMA wire (42) and/or the second SMA wire (52) as feedback.

6. The driving device for realizing automatic focusing and anti-shaking of the camera according to claim 2, wherein: the two first driving arms (41) and the first SMA wire (42) form an isosceles triangle relationship, the two second driving arms (51) and the second SMA wire (52) also form the isosceles triangle relationship, the first SMA wire (42) and the second SMA wire (52) are the bottom sides of the isosceles triangle, and the first SMA wire (42) and the second SMA wire (52) are arranged in a vertically staggered mode relative to the axial direction of the moving part (2).

7. The driving device for realizing automatic focusing and anti-shaking of the camera according to claim 2 or 6, wherein: the two first driving arms (41) are respectively integrally formed with the two first conductive supports (43); the two second driving arms (51) are respectively and integrally formed with the two second conductive supports (53), and the first elastic arm (431) and the second elastic arm (531) are designed to be inverted relatively.