CN110933277A

CN110933277A - Liquid lens focusing and anti-shake mechanism, camera module and electronic equipment

Info

Publication number: CN110933277A
Application number: CN201911276342.5A
Authority: CN
Inventors: 刘述伦; 耿新龙; 蔡日新
Original assignee: Dongguan Yadeng Electronics Co Ltd
Current assignee: Henan Haoze Electronics Co ltd Kunshan Branch
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2020-03-27

Abstract

The invention discloses a focusing mechanism of a liquid lens, a camera module and an electronic device. Liquid lens is focused and anti-shake mechanism includes: a liquid lens; the SMA actuator comprises two first touch plates, an SMA wire and a driven piece, wherein the first touch plates are conductors, two ends of the SMA wire are respectively and electrically connected with the two first touch plates, the driven piece is contacted with one side of the SMA wire and bends the SMA wire into a V shape, the SMA wire can slide on the surface of the driven piece in a state of keeping contact with the driven piece, and when the SMA wire contracts, the bent included angle of the SMA wire is increased and drives the driven piece to move; and the focusing ring is connected with the driven piece, the SMA wire can be contracted to drive the driving piece and the focusing ring to move, and the focusing ring can contact and extrude the liquid lens. The liquid lens focusing and anti-shaking mechanism has a simple and compact structure, is easy to manufacture, is beneficial to reducing the risk of abnormal deflection of the driven part and the focusing ring, and is beneficial to improving the imaging quality.

Description

Liquid lens focusing and anti-shake mechanism, camera module and electronic equipment

Technical Field

The present invention relates to the field of electronics, and in particular, to a liquid lens focusing and anti-shake mechanism, a camera module, and an electronic device.

Background

The liquid lens generally includes an annular lens frame, a light-transmitting cover plate and a light-transmitting film which respectively seal two end surfaces of the annular lens frame, wherein liquid is packaged in the annular lens frame, and the liquid in the annular lens frame flows by contacting and extruding the light-transmitting film, so that the shape of the liquid can be changed, and further the curvature, the focal length and the like of the liquid lens are changed.

The camera module provided with the liquid lens generally further includes an adjustment assembly disposed on a side of the liquid lens having the light transmissive film, and an actuator for driving the adjustment assembly to move so as to press or separate a ring thereof from the light transmissive film. The actuator of the camera module typically employs a voice coil motor or an SMA actuator.

The voice coil motor generates driving force through Lorentz force generated by an electrified coil in a magnetic field, a camera module is generally provided with a sensor and other electronic components, and the electrified coil and the magnetic field in the voice coil motor generate electromagnetic interference which can influence the normal operation of other electronic components to a certain extent.

The driving element in the SMA actuator is SMA (shape memory alloy), and the SMA is a material which has Shape Memory Effect (SME) through thermal elasticity, martensite phase transformation and inversion thereof and is composed of more than two metal elements; SMA can be deformed at a lower temperature, and can restore the shape before deformation after being electrified and heated, so that electrically-controlled contraction is realized, and further, driving force is generated. The existing SMA actuator is complex in structure, so that the occupied volume of the SMA actuator is large, and the manufacturing difficulty is high. In addition, in order to achieve focusing and anti-shake of the camera module, multiple sets of SMA actuators are generally required to be arranged in the camera module, which causes the problems of large occupied volume and high manufacturing difficulty to be more obvious.

Disclosure of Invention

The present invention is directed to solve at least one of the problems of the prior art, and provides a liquid lens focusing apparatus, a camera module and an electronic device with simple and compact structure.

The technical scheme adopted for solving the technical problems is as follows:

liquid lens is focused and anti-shake mechanism includes: a liquid lens which can change a curvature focal length by contact extrusion; the SMA actuator comprises two first touch plates, an SMA wire and a driven piece, wherein the first touch plates are conductors, two ends of the SMA wire are respectively and electrically connected with the two first touch plates, the driven piece is in contact with the SMA wire and bends the SMA wire into a V shape, the SMA wire can slide on the surface of the driven piece in a state of keeping contact with the driven piece, and the driven piece is driven to move when the SMA wire contracts; and the focusing ring is connected with the driven piece, the SMA wire can be communicated and contracted to drive the driving piece and the focusing ring to move, and the focusing ring can contact and extrude the liquid lens.

The liquid lens focusing and anti-shake mechanism at least has the following beneficial effects:

the SAM wire is contracted to drive the focusing ring, so that the normal work of other electronic elements cannot be influenced by electromagnetic interference; and the SMA wire is bent into a V shape and is contacted with the surface of the driven piece, so that the driven piece can be driven to move, the structure of the SMA actuator is simple and compact, and the liquid lens focusing and anti-shake mechanism can be miniaturized. The SMA wire and the surface of the driven piece can slide mutually, so that the SMA wire can be automatically corrected in a tensioning state, the situation that the SMA wire is asymmetric relative to the driven piece can be prevented, the risk of abnormal deflection of the driven piece and the focusing ring is reduced, and the imaging quality is improved.

In a possible embodiment of the invention, the driven member is provided with a groove, the bottom of the groove is provided with a protrusion, and the SMA wire is in contact with the protrusion and can slide relative to the protrusion. The SMA wire can be embedded into the groove, so that the SMA wire is not easy to separate from the groove, and the risk of dislocation and loosening of the SMA wire is reduced.

In a possible embodiment of the invention, the driven member is provided with a projection on a side surface thereof, and the recess is provided on the projection. Unnecessary contact and interference between the SMA wire and other parts of the driven piece can be avoided by arranging the groove on the bump, and the improvement of the precision in the focusing and anti-shaking adjusting process is facilitated.

In a possible embodiment of the present invention, the apparatus further includes an adjusting seat, the focusing ring is disposed on the adjusting seat, and the driven member and the adjusting seat are integrally formed.

In one possible embodiment of the invention, the SMA actuators are divided into a first SMA actuator and a second SMA actuator, and the liquid lens focus and anti-shake mechanism comprises at least one first SMA actuator 10a and/or at least one second SMA actuator 10 b. The opening directions of the included angles of the V-shaped formed by the SMA wires in the first SMA actuator and the second SMA actuator are opposite, so that the adjusting seat can be driven to move in opposite directions, and the adjusting seat can be driven to move in more directions, thereby being beneficial to expanding the focusing and anti-shaking functions of the camera module.

And the camera module comprises the liquid lens focusing and anti-shaking mechanism.

In a possible embodiment of the present invention, the camera module further includes a base and a fixed lens, the liquid lens is disposed above the base, the fixed lens is connected to the base and located below the liquid lens, the SMA actuator is connected to the base, and the focusing ring is located between the liquid lens and the fixed lens, so as to achieve focusing or anti-shake.

In a possible embodiment of the present invention, the camera module further includes a cover, the cover is covered on the base, and an accommodating cavity is formed between the cover and the base; the center of the base is provided with a first mounting hole for embedding and fixing the lens, and the center of the top of the cover body is provided with a second fixing hole for embedding the liquid lens; the SMA actuator is arranged inside the accommodating cavity, four corners of the base are provided with four connecting columns extending into the accommodating cavity, the first touch plate is connected to the connecting columns, and one end of the first touch plate penetrates through the base and extends to the outside of the accommodating cavity. The cover body is arranged, so that the liquid lens and the base can be conveniently connected, the SMA actuator, the solid lens and the like are packaged in the accommodating cavity, the structure is more compact, independent product components can be formed, and meanwhile, the internal components can be protected. And the first contact plate extends out of the accommodating cavity at one end to facilitate the overall circuit connection of the camera module and the electronic device.

In a possible implementation manner of the present invention, the liquid lens focusing and anti-shake mechanism further includes an adjusting assembly, the adjusting assembly includes an adjusting seat and a spring, the driven member is the adjusting seat, the spring is fixedly connected to the adjusting seat, the spring is provided with a plurality of elastic arms, one end of each elastic arm is connected to the base, and the elastic arms enable the spring to support the adjusting seat and enable the adjusting seat to move relative to the base.

In a possible embodiment of the invention, one end of the elastic arm is connected to the top of the connecting column, so that the adjusting seat can be suspended above the base, and the focusing ring can be conveniently contacted and pressed with the liquid lens.

The electronic equipment comprises a liquid lens focusing and anti-shaking mechanism.

An electronic device includes a camera module.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is an exploded view of a camera module according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a first SMA actuator 10a and a second SMA actuator 10b of an embodiment of the invention;

FIG. 3 is an enlarged partial schematic view of a driven member according to an embodiment of the present invention;

fig. 4 is a schematic view of a connection structure between the lens assembly and the driven member according to the embodiment of the invention;

fig. 5 is a schematic structural diagram of a base according to an embodiment of the invention.

Fig. 6 is a schematic structural diagram of a liquid lens according to an embodiment of the invention.

Reference numerals:

the SMA actuator 1, the SMA wire 110, the first contact plate 120, the driven member 130, the rib 131, the groove 132 and the projection 133;

the lens assembly 2, the adjusting base 210, the elastic arm 220, the spring 230 and the positioning column 211;

the base 3, a connecting column 301, a first mounting hole 302 and an open slot 303;

a cover 4 and a second mounting hole 401;

the liquid lens 5, a light-transmitting cover plate 501, an annular mirror frame 502, a light-transmitting film 503 and liquid 504;

a focusing ring 6 and a fixed lens 7.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1 to 6, the camera module of the present invention includes the liquid lens focusing and anti-shake mechanism of the present invention.

The liquid lens focusing and anti-shake mechanism comprises a liquid lens 5, a focusing ring 6 and an SMA actuator 1.

The liquid lens 5 includes an annular frame 502, a light-transmitting cover plate 501 and a light-transmitting film 503 which respectively seal two end faces of the annular frame 502, the annular frame 502 is internally packaged with liquid 504, and the liquid 504 in the annular frame 502 flows by contacting and pressing the light-transmitting film 503, so that the shape of the liquid 504 can be changed, and further the curvature and the focal length of the liquid lens 5 can be changed.

An SMA actuator 1 comprising two first contact plates 120, two lengths of SMA wire 110 and a driven member 130; the first touch plates 120 are conductors, and two ends of the SMA wire 110 are electrically connected to the two first touch plates 120 respectively; the driven member 130 contacts one side of the SMA wire 110 and bends the SMA wire 110 into a V shape, the SMA wire 110 can slide on the surface of the driven member 130 while keeping contact with the driven member 130, and the included angle of bending of the SMA wire 110 increases when the SMA wire 110 contracts and drives the driven member 130 to move.

And the focusing ring 6 is connected with the driven piece 130, the SMA wire 110 can be contracted to drive the driving piece 130 and the focusing ring 6 to move, and the focusing ring 6 can contact and extrude the liquid lens 5.

The liquid lens focusing and anti-shaking mechanism at least has the following beneficial effects:

the SAM wire 110 is contracted to drive the focusing ring 6, so that the normal work of other electronic components is not influenced by electromagnetic interference; furthermore, the SMA wire 110 is bent into a V shape and contacts with the surface of the driven member 130, so that the driven member 130 can be driven to move, and the SMA actuator 1 has a simple and compact structure and is easy to manufacture. The SMA wire 110 and the surface of the driven member 130 can slide relative to each other, so that the SMA wire 110 can automatically correct in a tensioned state, the situation that the SMA wire 110 is asymmetric relative to the driven member 130 can be prevented, the risk of abnormal deflection of the driven member 130 and the focusing ring 6 is reduced, and the imaging quality is improved.

As for the first contact plate 120, the first contact plate 120 is a metal plate. The first touch plate 120 is fixed to the base 3.

With respect to SMA wire 110, SMA wire 110 refers to a shape memory alloy wire. The two ends of the SMA wire 110 are energized through the first contact plate 120. The SMA wire 110 is retractable when it is heated by power-on, and is extendable and restored to its original length after power-off and temperature reduction. Thus, the SMA wire 110 can achieve electrically controlled contraction. The two sections of SMA wires 110 are symmetrically arranged and have an included angle greater than zero, which is in a V shape in this embodiment, and the contraction motions of the two sections of SMA wires 110 can be combined into a linear motion of the driven member 130.

Regarding the driven member 130, the driven member 130 is integrally formed with the adjustment seat 210. When the SMA wire 110 pulls the driven member 130, the adjusting seat 210 is driven to move, so as to adjust the angle and position of the adjusting seat 210.

Regarding the adjusting base 210, the focusing ring 6 is disposed on the adjusting base 210, and a driven member 130 is disposed on each of four side surfaces of the adjusting base 210.

Regarding the focus ring 6, the focus ring 6 is fixedly attached to the adjustment base 210. It will be appreciated that in other embodiments, the focus ring 6 may be integrally formed with the adjustment base 210, as the case may be.

In this embodiment, the driven member 130 is provided with a groove 132, the groove bottom of the groove 132 is provided with a protrusion 131, and the SMA wire 110 is in contact with the protrusion 131 and can slide relative to the protrusion 131. The SMA wire 110 can be embedded into the groove 132, so that the SMA wire 110 is not easy to be separated from the groove 132, and the risk of dislocation and loosening of the SMA wire 110 is reduced.

Regarding the protrusion 131, the width of the protrusion 131 is the same as the width of the groove 132, and the contact surface of the protrusion 131 and the SMA wire 110 is provided with a smooth curved surface, so that the resistance between the two can be reduced during the sliding of the SMA wire 110.

In this embodiment, the side of the driven member 130 is provided with a projection 133, and the groove 132 is provided on the projection 133. The groove 133 is arranged on the projection 133, so that unnecessary contact and interference between the SMA wire 110 and other parts of the driven piece 130 can be avoided, and the precision in the focusing and anti-shake adjusting process can be improved.

Regarding the SMA actuator 1, the SMA actuator 1 is divided into a first SMA actuator 10a and a second SMA actuator 10b, and the opening directions of the included angles of the V-shapes formed by bending the SMA wires 110 in the first SMA actuator 10a and the second SMA actuator 10b are opposite; the liquid lens focusing and anti-shake mechanism comprises at least one first SMA actuator 10a and at least one second SMA actuator 10b, and because the opening directions of the included angles between the two sections of SMA wires 110 are different, the focusing ring 6 can be driven to the opposite directions, and the focusing ring 6 can be driven to move to more directions, which is beneficial to expanding the focusing and anti-shake functions of the liquid lens focusing and anti-shake mechanism.

In the present embodiment, the number of the first SMA actuators 10a is two, the number of the second SMA actuators 10b is two, the two first SMA actuators 10a and the two second SMA actuators 10b are respectively arranged around the adjustment seat 210, the two first SMA actuators 10a are symmetrically arranged with respect to the adjustment seat 210, and the two second SMA actuators 10b are symmetrically arranged with respect to the adjustment seat 210. The two first SMA actuators 10a and the two second SMA actuators 10b are respectively and symmetrically arranged on two sides of the adjusting base 210, and by respectively detecting or controlling each SMA actuator 1, the detection or control of the inclination angle and the displacement of the adjusting base 210 and the focusing ring 6 can be realized, which is beneficial to further expanding the functions of inclination angle adjustment and position adjustment of the camera module and further expanding the functions of focusing and anti-shake of the camera module.

In this embodiment, the camera module includes base 3 and fixed lens 7, liquid lens 5 sets up 3 tops of base, fixed lens 7 is connected on base 3, and is located 5 below of liquid lens, SMA actuator 1 is connected on base 3, just focusing ring 6 is in liquid lens 5 with between the fixed lens 7, liquid lens focus and anti-shake mechanism can drive focusing ring 6 moves, and then contacts and extrudes liquid lens 5 realizes focusing and anti-shake function.

The camera module further comprises an adjusting assembly 2, wherein the adjusting assembly 2 comprises an adjusting seat 210 and a spring 230, the spring 230 is fixedly connected with the adjusting seat 210, the spring 220 is provided with a plurality of elastic arms 220, one end of each elastic arm 220 is connected with the base 3, and the elastic arms 220 enable the spring 230 to support the adjusting seat 210 and enable the adjusting seat 210 to move relative to the base 3.

Regarding the spring 230, the spring 230 is fixed to fit with the upper surface of the adjustment seat 210. The spring 230 is a metal sheet integrally formed with the elastic arm 220, and the elastic arm 220 allows the adjusting seat 210 to be elastically suspended on the base 3, so that the adjusting seat 210 can be easily driven on each SMA actuator 1. The spring 230 constitutes a suspension system for the lens assembly 2. Here, the spring 230 does not refer to a coil spring, a spiral spring or a plate spring, which are commonly used in the mechanical field, but a profile spring, which is used exclusively for the suspension of the adjustment assembly 2.

Of course, in some other embodiments, the number of the springs 230 may be optionally provided with a plurality of springs, for example, two springs may be provided, wherein one spring 230 is fixed to the upper surface of the adjusting seat 210 in a fitting manner, and the other spring 230 is fixed to the lower surface of the adjusting seat 210 in a fitting manner.

Regarding the camera module, still including lid 4, lid 4 covers the top of establishing in base 3, and forms between lid 4 and the base 3 and hold the chamber, and the first mounting hole 302 that is used for inlaying dress fixed lens 7 is seted up at the center of base 3, and the center at lid 4 top is seted up and is used for inlaying dress second fixed orifices 401 of liquid lens 5, and fixed lens 7, regulation seat 210, focusing ring 6, SMA actuator 1 all set up inside holding the chamber.

Regarding base 3, four edges of base 3 all are provided with four spliced poles 301 that extend to holding the intracavity, and the one end of elastic arm 220 is connected to the top of spliced pole 301, and first touch panel 120 among the SMA actuator 1 all connects the side at spliced pole 301 to four SMA actuators 1 correspond the four sides of base 3 respectively, and in order to facilitate carrying out circuit connection, first touch panel 120 one end is passed base 3 and extend to holding the chamber outside, and base 3 sets up the open slot 303 that allows first touch panel 120 to wear out.

The liquid lens focusing and anti-shaking mechanism and the camera module in the technical scheme can be used in electronic equipment.

Claims

1. Liquid camera lens is focused and anti-shake mechanism, its characterized in that includes:

a liquid lens which can change a curvature focal length by contact extrusion;

the SMA actuator comprises two first touch plates, an SMA wire and a driven piece, wherein the first touch plates are conductors, two ends of the SMA wire are respectively and electrically connected with the two first touch plates, the driven piece is in contact with the SMA wire and bends the SMA wire into a V shape, the SMA wire can slide on the surface of the driven piece in a state of keeping contact with the driven piece, and the driven piece is driven to move when the SMA wire contracts;

and the focusing ring is connected with the driven piece and can move along with the driven piece to contact and press the liquid lens.

2. The liquid lens focusing and anti-shake mechanism according to claim 1, wherein: the driven piece is provided with a groove, the groove bottom of the groove is provided with a bulge, and the SMA wire is in contact with the bulge and can slide relative to the bulge.

3. The liquid lens focusing and anti-shake mechanism according to claim 1, wherein: the side of the driven piece is provided with a lug, and the groove is formed in the lug.

4. The liquid lens focusing and anti-shake mechanism according to claim 1, wherein: the focusing ring is arranged on the adjusting seat, and the driven piece and the adjusting seat are integrally formed.

5. A liquid lens focusing and anti-shake mechanism according to any of claims 1-4, wherein: the SMA actuator is divided into a first SMA actuator and a second SMA actuator, and the opening directions of included angles formed by bending the SMA wires in the first SMA actuator and the second SMA actuator are opposite; the liquid lens focus and anti-shake mechanism comprises at least one first SMA actuator 10a and/or at least one second SMA actuator 10 b.

6. A camera module, characterized by: comprising the liquid lens focusing and anti-shake mechanism of any of claims 1 to 5.

7. The camera module of claim 6, wherein: the liquid lens is arranged above the base, the fixed lens is connected to the base and located below the liquid lens, the SMA actuator is connected to the base, and the focusing ring is located between the liquid lens and the fixed lens.

8. The camera module of claim 6, wherein: the cover body is covered on the base, and an accommodating cavity is formed between the cover body and the base; the center of the base is provided with a first mounting hole for embedding and fixing the lens, and the center of the top of the cover body is provided with a second fixing hole for embedding the liquid lens; the SMA actuator is arranged inside the accommodating cavity, four corners of the base are provided with four connecting columns extending into the accommodating cavity, the first touch plate is connected to the connecting columns, and one end of the first touch plate penetrates through the base and extends to the outside of the accommodating cavity.

9. An electronic device, characterized in that: comprising the liquid lens focusing and anti-shake mechanism of any of claims 1 to 5.

10. An electronic device, characterized in that: comprising a camera module according to any one of claims 6 to 8.