CN114007008A

CN114007008A - Lens device

Info

Publication number: CN114007008A
Application number: CN202111450263.9A
Authority: CN
Inventors: 刘述伦; 夏念明; 胡阳辉
Original assignee: Guangdong Haideya Technology Co ltd
Current assignee: Henan Haoze Electronics Co ltd Kunshan Branch
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-02-01

Abstract

The invention relates to the technical field of camera equipment, in particular to a lens device. The lens device comprises a shape memory alloy wire, an image sensor unit, an upper fixed plate, a movable seat, a shell, a lens and an elastic piece; the upper fixing plate is provided with two electrical contact parts, the center part of the shape memory alloy wire is arranged on the movable seat, two ends of the shape memory alloy wire are respectively fixed on the electrical contact parts, and the shape memory alloy wire is electrified and contracted to drive the movable seat to move for a preset distance in a first direction parallel to the optical axis; the shell is fixed on the movable seat, the image sensor unit is clamped on the shell, and the lens is arranged on the image sensor unit; the elastic piece is fixedly arranged on the upper fixing plate and the movable seat, and the elastic piece drives the movable seat to move in the direction opposite to the first direction by virtue of elasticity. The shape memory alloy wire and the elastic piece are used as a driving mechanism, and the electromagnetic interference problem of an electromagnetic motor is avoided. The shape memory alloy wire has small volume and is beneficial to the miniaturization of a driving mechanism.

Description

Lens device

Technical Field

The invention relates to the technical field of camera equipment, in particular to a lens device.

Background

The conventional electromagnetic VCM focusing motor usually moves the lens or lens group for focusing, and the image sensor is still. The main disadvantage of this design is that the lens size and the lens quality increase with the improvement of the pixel quality, and at this time, the thrust of the lens moving of the conventional elastic piece type VCM focusing motor cannot meet the focusing requirement, or the reliability of the whole motor is deteriorated. Under the condition of meeting the thrust, the size of the magnet and the coil also needs to be increased continuously, so that the size of the whole motor is overlarge, and electromagnetic interference occurs between adjacent motors.

Disclosure of Invention

The invention aims to provide a lens device which avoids the problem of electromagnetic interference and is beneficial to miniaturization of a driving mechanism.

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

a lens device comprises a shape memory alloy wire, an image sensor unit, an upper fixing plate, a movable seat, a shell, a lens and an elastic piece;

the upper fixing plate is provided with two electrical contact parts, the center part of the shape memory alloy wire is arranged on the movable seat, two ends of the shape memory alloy wire are respectively fixed on the electrical contact parts, and the shape memory alloy wire is electrified and contracted to drive the movable seat to move for a preset distance in a first direction parallel to the optical axis of the lens;

the shell is fixed on the movable seat, a groove is formed in the shell, the image sensor unit is clamped in the groove, and the lens is arranged on the image sensor unit;

the elastic piece is fixedly arranged on the upper fixing plate and the movable seat, and the elastic piece is used for driving the movable seat to move in the direction opposite to the first direction by means of the elastic force formed by driving.

Preferably, the image sensor further comprises a flexible wiring board, and the image sensor unit is arranged on the flexible wiring board.

Preferably, the movable seat comprises a movable plate and a PCB, the movable plate is arranged on the PCB, and the PCB is arranged on the flexible circuit board.

Preferably, the movable plate is provided with a protruding portion, the protruding portion is provided with a notch, and the shape memory alloy wire is hung at the notch.

Preferably, the central part of the shape memory alloy wire is fixed at the notch by adopting curing glue.

Preferably, the PCB further comprises a magnet, the magnet is arranged on the PCB, and a Hall sensor is arranged on the upper fixing plate corresponding to the position of the magnet.

Preferably, a first connecting column is arranged on the movable plate, and a second connecting column is arranged on the upper fixing plate;

the elastic piece is provided with a first through hole and a second through hole, the first connecting column penetrates through the first through hole, and the second connecting column penetrates through the second through hole.

Preferably, the wire fixing device further comprises a base, the upper fixing plate is covered on the base to form an accommodating space, the shape memory alloy wire, the movable seat and the elastic piece are arranged in the accommodating space, and the shell is arranged in the movable seat.

Preferably, the elastic member is a cantilever plate spring.

Compared with the prior art, the embodiment of the invention has the following beneficial effects:

two electrical property contact portions are used for supplying power for the shape memory alloy wire, thereby the circular telegram of shape memory alloy wire shrink drives the sliding seat and moves the distance of predetermineeing in the direction that is on a parallel with the optical axis, and the elastic component is fixed to be set up on an upper fixed plate and sliding seat, thereby the sliding seat drives the one end removal of elastic component, and at this moment, the elastic component takes place deformation. The elastic piece is used for driving the movable seat to move for a corresponding distance in the direction opposite to the first direction by means of the elastic force formed by driving, and the lens can be focused.

The lens device adopts the shape memory alloy wire and the elastic piece as the driving mechanism, the driving mechanism does not adopt the traditional elastic piece type VCM focusing motor any longer, and the driving mechanism has no electromagnetic interference problem of an electromagnetic motor. In addition, the shape memory alloy wire itself is small in size, thereby contributing to miniaturization of the drive mechanism.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic view of an overall structure of a lens apparatus according to an embodiment of the present invention;

fig. 2 is a schematic diagram of an explosion structure of a lens apparatus according to an embodiment of the present invention.

Illustration of the drawings: the image sensor comprises a shape memory alloy wire 1, an image sensor unit 2, an upper fixing plate 3, a movable seat 4, a shell 5, a lens 6, an elastic piece 7, a flexible circuit board 8, a base 9 and a magnet 10;

an electrical contact portion 31, a movable plate 41, a PCB plate 42, and a protrusion portion 43.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Furthermore, the terms "long", "short", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention, but do not indicate or imply that the referred devices or elements must have the specific orientations, be configured to operate in the specific orientations, and thus are not to be construed as limitations of the present invention.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

Referring to fig. 1 to 2, a lens apparatus includes a shape memory alloy wire 1, an image sensor unit 2, an upper fixing plate 3, a movable seat 4, a housing 5, a lens 6, and an elastic member 7;

the upper fixing plate 3 is provided with two electrical contact parts 31, the central part of the shape memory alloy wire 1 is arranged on the movable seat 4, two ends of the shape memory alloy wire 1 are respectively fixed on the electrical contact parts 31, and the shape memory alloy wire 1 is electrified and contracted to drive the movable seat 4 to move for a preset distance in a first direction parallel to the optical axis of the lens 6;

the shell 5 is fixed on the movable seat 4, a groove is formed in the shell 5, the image sensor unit 2 is clamped in the groove, and the lens 6 is arranged on the image sensor unit 2;

the elastic element 7 is fixedly arranged on the upper fixing plate 3 and the movable seat 4, and the elastic element 7 is used for driving the movable seat 4 to move in the direction opposite to the first direction by means of the elastic force formed by driving. The elastic member 7 of this embodiment is a cantilever plate spring.

Specifically, the two electrical contacts 31 are used for supplying power to the shape memory alloy wire 1, and the shape memory alloy wire 1 is electrified and contracted to drive the movable seat 4 to move a preset distance in a direction parallel to the optical axis, where the moving direction of the movable seat 4 is defined as a first direction. The elastic component 7 is fixedly arranged on the upper fixing plate 3 and the movable seat 4, so that the movable seat 4 drives one end of the elastic component 7 to move, and at the moment, the elastic component 7 deforms. The preset distance may be a distance from a current position of the lens 6 to a position where the lens is located when the lens is focused accurately, so that the lens 6 is focused. The elastic member 7 is used for driving the movable seat 4 to move a corresponding distance in a direction opposite to the first direction by means of the elastic force formed by the driving, where the moving direction of the movable seat 4 is defined as a second direction. The image sensor unit 2 can be moved in a direction parallel to the optical axis so that the lens 6 is brought into focus.

The lens apparatus of the present embodiment uses the shape memory alloy wire 1 and the elastic member 7 as a driving mechanism which drives the image sensor unit 2 to move, and does not drive the lens 6 to move any more, and the mass and volume increase of the lens 6 are not correlated with the thrust of the driving mechanism. The image sensor 6 is usually provided with an FPC with higher rigidity, and the thrust of the shape memory alloy wire 1 is usually 5-20 times that of a traditional electromagnetic VCM motor, so that the thrust requirement of the lens device can be met.

The driving mechanism does not adopt the traditional elastic piece type VCM focusing motor any more, and the driving mechanism has no electromagnetic interference problem of an electromagnetic motor. In addition, the shape memory alloy wire itself is small in size, thereby contributing to miniaturization of the drive mechanism.

Further, as will be understood by those skilled in the art, the preset distance is related to the magnitude of the current of the energized amount, and the larger the current, the larger the amount of contraction of the shape memory alloy wire, and the larger the preset distance. The focusing function of the camera can be realized by controlling the magnitude of the electrified current.

In an alternative embodiment, the lens apparatus further includes a flexible wiring board 8, and the image sensor unit 2 is disposed on the flexible wiring board 8. The image sensor unit 2 communicates with an external control terminal through a flexible wiring board 8 to transmit image information.

In this embodiment, the movable seat 4 includes a movable plate 41 and a PCB 42, the movable plate 41 is disposed on the PCB 42, and the PCB 42 is disposed on the flexible printed circuit 8.

In an alternative embodiment, the movable plate 41 is provided with a protrusion 43, the protrusion 43 is provided with a notch, and the shape memory alloy wire 1 is hung at the notch. The shape memory alloy wire 1 keeps a certain gap with the movable plate 41, and the shape memory alloy wire 1 moves through the driving protrusion 43 to drive the movable plate 41 to move.

Further, the central part of the shape memory alloy wire 1 is fixed at the gap by adopting curing glue. The shape memory alloy wire 1 of the present application may be connected to the boss portion 43 by means of engagement, hooking, or the like.

In order to more precisely control the displacement of the image sensor unit 2, in an alternative embodiment, the lens device further includes a magnet 10, the magnet 10 is disposed on the PCB board 42, and a hall sensor is disposed on the upper fixing plate 3 at a position corresponding to the magnet 10. The Hall sensor is connected with an external control end, the distance between the magnet 10 and the Hall sensor is changed, the Hall voltage value is correspondingly changed, the Hall voltage is changed along with the change of the magnetic field intensity, the stronger the magnetic field is, the higher the voltage is, the weaker the magnetic field is, the lower the voltage is, and the Hall voltage value is very small. By detecting the hall voltage, the displacement amount of the image sensor unit 2 is accurately controlled.

Further, a first connecting column is arranged on the movable plate 41, and a second connecting column is arranged on the upper fixing plate 3;

the elastic member 7 is provided with a first through hole and a second through hole, the first connecting column passes through the first through hole, the elastic member 7 is connected with the movable plate 41, the second connecting column passes through the second through hole, and the elastic member 7 is connected with the upper fixing plate 3.

In an alternative embodiment, the lens device further includes a base 9, the upper fixing plate 3 is covered on the base 9 to form a receiving space, the shape memory alloy wire 1, the movable seat 4 and the elastic member 7 are disposed in the receiving space, and the housing 5 is disposed in the movable seat 4.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A lens device is characterized by comprising a shape memory alloy wire (1), an image sensor unit (2), an upper fixed plate (3), a movable seat (4), a shell (5), a lens (6) and an elastic piece (7);

the upper fixing plate (3) is provided with two electrical contact parts (31), the center part of the shape memory alloy wire (1) is arranged on the movable seat (4), two ends of the shape memory alloy wire (1) are respectively fixed on the electrical contact parts (31), and the shape memory alloy wire (1) is electrified and contracted to drive the movable seat (4) to move for a preset distance in a first direction parallel to the optical axis of the lens (6);

the shell (5) is fixed on the movable seat (4), a groove is formed in the shell (5), the image sensor unit (2) is clamped in the groove, and the lens (6) is arranged on the image sensor unit (2);

the elastic piece (7) is fixedly arranged on the upper fixing plate (3) and the movable seat (4), and the elastic piece (7) is used for driving the movable seat (4) to move in the direction opposite to the first direction by means of the elastic force formed by driving.

2. The lens device according to claim 1, further comprising a flexible wiring board (8), the image sensor unit (2) being provided on the flexible wiring board (8).

3. The lens device according to claim 2, wherein the movable stage (4) includes a movable plate (41) and a PCB board (42), the movable plate (41) being disposed on the PCB board (42), the PCB board (42) being disposed on the flexible wiring board (8).

4. The lens device according to claim 3, wherein a protrusion (43) is provided on the movable plate (41), a notch is provided on the protrusion (43), and the shape memory alloy wire (1) is hung at the notch.

5. The lens device according to claim 4, characterized in that the central portion of the shape memory alloy wire (1) is fixed at the notch with a cured glue.

6. The lens device according to claim 3, further comprising a magnet (10), wherein the magnet (10) is disposed on the PCB (42), and a Hall sensor is disposed on the upper fixing plate (3) at a position corresponding to the magnet (10).

7. The lens device according to claim 3, wherein the movable plate (41) is provided with a first connecting post, and the upper fixed plate (3) is provided with a second connecting post;

a first through hole and a second through hole are formed in the elastic piece (7), the first connecting column penetrates through the first through hole, and the second connecting column penetrates through the second through hole.

8. The lens device according to claim 1, further comprising a base (9), wherein the upper fixing plate (3) is covered on the base (9) to form a receiving space, the shape memory alloy wire (1), the movable seat (4), and the elastic member (7) are disposed in the receiving space, and the housing (5) is disposed in the movable seat (4).

9. A lens device according to claim 1, wherein the elastic member (7) is a cantilever plate spring.