CN111175964A

CN111175964A - Liquid lens focusing and anti-shake device, camera module and electronic equipment

Info

Publication number: CN111175964A
Application number: CN201911274956.XA
Authority: CN
Inventors: 刘述伦; 计树标; 陈林
Original assignee: Dongguan Yadeng Electronics Co Ltd
Current assignee: Guangdong haideya Technology Co.,Ltd.
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2020-05-19

Abstract

The invention discloses a focusing device of a liquid lens, a camera module and electronic equipment. Liquid lens focusing and anti-shake device includes: a liquid lens; the SMA actuator comprises an SMA wire and two actuating bodies, and the SMA wire can be electrified and contracted; the actuating bodies comprise connecting rods, supporting parts and first elastic arms, one ends of the connecting rods are connected with the SMA wires, one ends of the connecting rods are elastically connected with the supporting parts, the first elastic arms are arranged between the connecting rods and the supporting parts, and the first elastic arms can be elastically bent; one end of the connecting rod is hinged with the driven piece, an adjusting ring is arranged on the driven piece, and the SMA wire can contract to drive the adjusting ring to move so as to contact and extrude the liquid lens. The invention can make the displacement of the adjusting ring larger than the contraction of the SMA wire, and realize larger focusing stroke under the condition of smaller actuator volume, which is beneficial to miniaturization. Meanwhile, the two connecting rods in the SMA actuator are coaxially hinged, so that the inclination of the adjusting ring is improved, and the imaging quality is improved.

Description

Liquid lens focusing and anti-shake device, 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 apparatus, 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 generally 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 to influence the normal operation of the 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 usually pulls the adjusting assembly directly through the SMA wire, so the driving stroke of the adjusting assembly is usually not larger than the contraction amount of the SMA wire, and the movement stroke can be made larger only by increasing the whole scale of the SMA actuator, so the miniaturization of the liquid lens focusing device is not facilitated. In addition, the Tilt (Tilt) of the lens is an important factor in the camera module that degrades the imaging quality, and the SMA actuator should operate with as little adverse effect as possible due to the Tilt.

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 a large driving stroke and a compact structure.

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

liquid lens focusing and anti-shake device includes: a liquid lens which can change a curvature focal length by contact extrusion; the SMA actuator comprises an SMA wire and two actuating bodies, wherein the SMA wire can be electrified and contracted; the actuating bodies comprise connecting rods, supporting parts and first elastic arms, one ends of the connecting rods are connected with the SMA wires, one ends of the connecting rods are elastically connected with the supporting parts, the first elastic arms are arranged between the connecting rods and the supporting parts, and the first elastic arms can be elastically bent; the driven part, the one end of connecting rod with the driven part is articulated, be provided with the adjustable ring on the driven part, SMA wire accessible shrink drive the connecting rod is relative the supporting part swing, the connecting rod can drive driven part and adjustable ring motion, adjustable ring motion contactablely extrudees liquid camera lens.

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

the actuator consisting of the SAM wire, the connecting rod, the supporting part and the first elastic arm drives the adjusting ring, so that the normal work of other electronic elements is not influenced by the electromagnetic interference; and the first elastic arm enables the connecting rod to elastically swing relative to the supporting part, and enables the displacement of the driven part and the adjusting ring to be larger than the contraction of the SMA wire, so that a larger focusing stroke can be realized under the condition that the volume of the actuator is smaller, and the miniaturization of the liquid lens focusing device is facilitated. Meanwhile, the two connecting rods in the SMA actuator are coaxially hinged, so that the inclination of the adjusting ring is improved, and the imaging quality is improved.

In one possible embodiment of the invention, the support portion, the first resilient arm and the link are integrally formed by a conductive material. The support portion, the first elastic arm and the connecting rod are integrally formed, so that manufacturing difficulty and cost of the SMA actuator are reduced, the support portion, the first elastic arm and the connecting rod can be made of the SMA wire to be conductive through the conductive materials, and the overall circuit structure of the SMA actuator is simplified.

In a possible embodiment of the invention, the adjusting ring is formed integrally with the adjusting seat, in order to simplify the connection structure.

In one possible embodiment of the invention, the liquid lens focusing and anti-shake apparatus comprises at least one first SMA actuator and at least one second SMA actuator, the first SMA actuator and the second SMA actuator being able to drive the adjustment ring in opposite directions. The relative positions of the connecting rod, the SMA wire and the base body in the first SMA actuator and the second SMA actuator are different, so that the driven piece can be driven in opposite directions, the adjusting ring can be driven to move in multiple directions, and the focusing and anti-shaking functions of the camera module can be expanded.

In one possible embodiment of the invention, a spacer or a diaphragm is provided between the contact surfaces of the two coaxially articulated connecting rods, which spacer or diaphragm is insulating. The insulating spacer or isolating film can prevent short circuit at two ends of the SMA wire, reduce friction between the connecting rods and reduce abrasion of a contact surface between the two connecting rods.

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

In a possible implementation manner 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 adjusting ring is located between the liquid lens and the fixed lens, so as to implement focusing or anti-shake.

In a possible implementation manner of the present invention, the adjusting device further includes an adjusting assembly, the adjusting assembly includes an adjusting seat and a spring, the driven element is the adjusting seat, the spring is fixedly connected to the adjusting seat, the spring is provided with a plurality of second elastic arms, one end of each second elastic arm is connected to the base, and the second elastic arms enable the spring to support the adjusting seat and enable the adjusting seat to move relative to the base.

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

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 schematic view of a camera module according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a first SMA actuator of an embodiment of the invention;

FIG. 3 is a schematic structural diagram of a second SMA actuator of an embodiment of the invention;

FIG. 4 is a schematic structural diagram of a lens assembly according to an embodiment of the present invention;

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

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

reference numerals:

the SMA actuator 1, the SMA wire 101, the actuating body 110, the link 102, the first elastic arm 103, the support portion 104;

the adjusting assembly 2, the adjusting seat 201, the spring 202, the second elastic arm 204 and the hinge column 205;

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 404;

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

adjusting ring 6, fixed lens 7.

Detailed Description

Example 1:

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 apparatus of the present invention.

The liquid lens focusing and anti-shake device comprises a liquid lens 5, an adjusting ring 6, an SMA actuator 1 and a driven part.

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.

The SMA actuator 1 comprises an SMA wire 101 and two actuating bodies 110, wherein the SMA wire 101 can be electrified and contracted; the actuating bodies 110 each include a link 102, a support portion 104, and a first elastic arm 103, one end of the link 102 is connected to the SMA wire 1, one end of the link 102 is elastically connected to the support portion 104, the first elastic arm 103 is provided between the link 102 and the support portion 104, and the first elastic arm 103 is elastically bendable.

One end of the connecting rod 102 is hinged to the driven member, the driven member is provided with an adjusting ring 6, the SMA wire 1 can drive the connecting rod 102 to swing relative to the supporting portion 104 through contraction, the connecting rod 102 can drive the driven member and the adjusting ring 6 to move, and the adjusting ring 6 can contact and extrude the liquid lens 5.

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

the adjustment ring 6 is driven by the actuator composed of the SAM wire 101, the connecting rod 102, the supporting portion 104 and the first elastic arm 103, and the normal operation of other electronic components is not affected by the electromagnetic interference; in addition, the first elastic arm 103 enables the connecting rod 102 to elastically swing relative to the supporting part 104, and enables the displacement of the adjusting ring 6 to be larger than the contraction amount of the SMA wire 101, so that a larger focusing stroke can be realized under the condition that the actuator volume is smaller, and the miniaturization of the liquid lens focusing device is facilitated. Meanwhile, the two connecting rods 102 in the SMA actuator 1 are coaxially hinged, so that the problem that the adjusting ring 6 is unnecessarily inclined due to inconsistent swing amplitudes of the two connecting rods 102 after the SAM wire 1 is contracted can be avoided, and the imaging quality is improved.

Regarding the support portion 104, the support portion 104 is fixed on the base 3, and the link 102 and the adjustment seat 201 are movable relative to the support portion 104.

As for the SMA wire 101, the SMA wire 101 is a shape memory alloy wire that can achieve length contraction before and after energization.

Regarding the first elastic arm 103, the first elastic arm 103 is made of an elastic material, and can be bent when the SMA wire 101 is contracted. The first elastic arm 103 is in a bar shape, one end of the first elastic arm 103 is connected to the support portion 104, and the other end is connected to the link 102.

With respect to the link 102, the link 102 is a rod having a certain rigidity, and supports the adjustment ring 6 and the like for displacement.

Regarding the driven member, the driven member is the adjusting seat 201, a protruding hinge column is arranged on the adjusting seat 201, a hinge ring is arranged at one end of the connecting rod 102, the hinge ring is sleeved on the hinge column to form a hinge mechanism, and the adjusting ring 6 is fixedly connected to the adjusting seat 201. It will be appreciated that, as a practical matter, in other embodiments, the adjustment ring 6 may also be provided integrally with the adjustment seat 201.

In the present embodiment, the support portion 104, the first elastic arm 103 and the link 102 are integrally molded by a conductive material. The support portion 104, the first elastic arm 103 and the connecting rod 102 are integrally formed, so that the manufacturing difficulty and cost of the SMA actuator 1 are reduced, and the support portion 104, the first elastic arm 103 and the connecting rod 102 can be made of conductive materials to be conductive to the SMA wire 101, so that the overall circuit structure of the liquid lens focusing device is simplified.

The support portion 104, the first elastic arm 103, and the link 102 are integrally formed of a metal material, and thus have both excellent elasticity and conductivity.

In the present embodiment, the actuating bodies 110 in the same SMA actuator 1 are symmetrically arranged, that is, the number of the support portions 104, the first elastic arms 103 and the connecting rods 102 in the same SMA actuator 1 is two and symmetrically arranged, so as to enhance the stability of the movement of the driven member.

With respect to the SMA wire 101, both ends of the SMA wire 101 are respectively connected to one ends of two links 102 in the same SMA actuator 1, so that the two symmetrically arranged links 102 can be simultaneously driven when the SMA wire 101 contracts.

With regard to the SMA actuator 1, the SMA actuator 1 is divided into a first SMA actuator 10a and a second SMA actuator 10b, the SMA wire 101 of the first SMA actuator 10a being arranged between the connecting rod 102 and the base 3, and the connecting rod 102 of the second SMA actuator 10b being arranged between the SMA wire 101 and the base 3. The liquid lens focusing and anti-shake device comprises at least one first SMA actuator 10a and at least one second SMA actuator 10b, and due to the different relative positions of the connecting rod 102, the SMA wire 101 and the base 3 in the first SMA actuator 10a and the second SMA actuator 10b, the adjusting ring 6 can be driven in opposite directions, and the adjusting ring 6 can be driven to move in more directions, which is beneficial to expanding the focusing and anti-shake functions of the liquid lens focusing and anti-shake device.

In the present embodiment, with regard to the links 102, the ends of the two links 102 are coaxially hinged on the driven member. The driven piece is the regulation seat 201, is equipped with four articulated posts 205 on adjusting seat 201, and four articulated posts 205 are evenly distributed around adjusting seat 201, and four articulated posts 205 are articulated with connecting rod 102 in two first SMA actuators 10a and two second SMA actuators 10b respectively. The two connecting rods 102 in each SMA actuator 1 share one hinge column 205, so that the two connecting rods 102 in one SMA actuator 1 can be coaxially hinged.

In the present embodiment, a spacer or a diaphragm is provided between the contact surfaces of the two coaxially hinged links 102, and the spacer or diaphragm is insulating. The insulating spacer or film prevents shorting across the SMA wire 101 and acts to reduce friction between the links 102 and also reduces wear of the interface between the two links 102.

Of course, in other embodiments, when the actuating body 110 is made of other elastic materials that are not electrically conductive, the contact surfaces of the two connecting rods 102 may be in direct contact with each other; or when a circuit board is arranged on the surface of the actuating body 110 to realize the electric connection of the SMA wire 101, and the actuating body 110 is insulated from the SMA wire 101, the contact surfaces of the two connecting rods 102 can be in direct contact with each other.

As for the separator and the separator, the separator or the separator is not shown in the drawing. The spacer may be configured as a ring shape that is coaxially nested with the two links 102 on the hinge post 205. The material of the spacer is selected from, but not limited to, plastic sheets. The isolation film may be provided as a film or coating that wraps around the end of the connecting rod 102, and may be selected from, but is not limited to, a plastic film formed by plastic dipping or an insulating coating formed by spraying.

With regard to the SMA actuators 1, preferably, each SMA actuator 1 surrounds the adjustment seat 201.

With respect to the liquid lens focusing and anti-shake apparatus, the first SMA actuators 10a are two in number and symmetrically arranged with respect to the adjustment mount 201, and the second SMA actuators 10b are two in number and symmetrically arranged with respect to the adjustment mount 201. The two first SMA actuators 10a and the two second SMA actuators 10b are respectively and symmetrically arranged about the adjusting base 201, and by respectively detecting or controlling each SMA actuator 1, the inclination angles and displacements of the adjusting base 201 and the adjusting ring 6 can be detected or controlled, which is beneficial to further expanding the anti-shake and focusing functions of the camera module.

With respect to the first and

second SMA actuators

10a, 10b, the differences are contrastable from fig. 1, 2 and 3. When the SMA wire 101 contracts, the link 102 of the first SMA actuator 10a swings away from the base 3, thereby driving the adjustment mount 201 away from the base 3. When the SMA wire 101 contracts, the link 102 of the second SMA actuator 10b swings in a direction approaching the base 3, so that the adjustment seat 201 can be driven to approach the base 3.

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

Regarding the camera module, the camera module further includes an adjusting assembly 2, the adjusting assembly 2 includes an adjusting seat 201, the adjusting ring 6 is disposed on the adjusting seat 201, one end of the connecting rod 102 is hinged to the adjusting seat 201, the adjusting seat 201 is movably connected to the base 3, and the SMA actuator 1 can drive the adjusting seat 201 and the adjusting ring 6 to move relative to the base 3, so as to achieve focusing or anti-shake.

The adjusting assembly 2 further includes a spring 202, the spring 202 is fixedly connected to the adjusting base 201, the spring 202 is provided with a plurality of second elastic arms 204, one end of each second elastic arm 204 is connected to the base 3, and the second elastic arms 204 enable the spring 202 to support the adjusting base 201 and enable the adjusting base 201 to move relative to the base 3.

Regarding the spring 202, the spring 202 is fixed in conformity with the upper surface of the adjustment seat 201. The spring 202 and the second elastic arm 204 are integrally formed metal sheets, and the second elastic arm 204 enables the adjusting seat 201 to form an elastic suspension state on the base 3, so that the adjusting seat 201 can be easily driven on each SMA actuator 1. The spring 202 constitutes a suspension system for the lens assembly 2. Here, the spring 202 does not refer to a coil spring, a spiral spring or a plate spring, which are common in the mechanical field, but is a profile spring dedicated to the suspension of the adjustment assembly 2.

Of course, according to practical circumstances, in other embodiments, the number of the springs 202 may be optionally provided with a plurality of springs, for example, two springs may be provided, where one spring 202 is fixed to the upper surface of the adjusting seat 201 in an abutting manner, and the other spring 202 is fixed to the lower surface of the adjusting seat 201 in an abutting manner.

Regarding the camera module, still including lid 4, lid 4 covers the top of establishing at 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 the second fixed orifices 401 of inlaying dress liquid lens 5, and fixed lens 7, regulation seat 201, adjustable ring 6, SMA actuator 1 all set up and hold the intracavity portion.

Regarding base 3, four corners of base 3 all are provided with four spliced poles 301 that extend to holding the intracavity, and the one end of second elastic arm 204 is connected to the top of spliced pole 301, and the side at spliced pole 301 is all connected to supporting part 104 among the SMA actuator 1 to four SMA actuators 1 correspond the four sides of base 3 respectively, and for the convenience of carrying out circuit connection, supporting part 104 one end is passed base 3 and extend to and hold the chamber outside, and base 3 sets up the open slot 303 that allows supporting part 104 to wear out.

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

Claims

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

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

the SMA actuator comprises an SMA wire and two actuating bodies, wherein the SMA wire can be electrified and contracted; the actuating bodies comprise connecting rods, supporting parts and first elastic arms, one ends of the connecting rods are connected with the SMA wires, one ends of the connecting rods are elastically connected with the supporting parts, the first elastic arms are arranged between the connecting rods and the supporting parts, and the first elastic arms can be elastically bent;

the driven part, the one end of connecting rod with the driven part is articulated, be provided with the adjustable ring on the driven part, SMA wire accessible shrink drive the connecting rod is relative the supporting part swing, the connecting rod can drive driven part and adjustable ring motion, adjustable ring motion contactablely extrudees liquid camera lens.

2. The liquid lens focusing and anti-shake apparatus according to claim 1, wherein: the support portion, the first elastic arm and the link are integrally formed by a conductive material.

3. The liquid lens focusing and anti-shake apparatus according to claim 1, wherein: one end of the first elastic arm is connected with the supporting part, and the other end of the first elastic arm is connected with the connecting rod.

4. A liquid lens focusing and anti-shake apparatus according to any one of claims 1-3, wherein: at least one first SMA actuator and/or at least one second SMA actuator is included, the first SMA actuator and the second SMA actuator being operable to drive the adjustment ring in opposite directions.

5. A liquid lens focusing and anti-shake apparatus according to any one of claims 1-3, wherein: the contact surfaces of the two coaxially hinged connecting rods are in insulated direct contact; or a spacer or a barrier film is arranged between the contact surfaces of the two coaxially hinged connecting rods, and the spacer or the barrier film is made of insulating materials.

6. A camera module characterized by: comprising a liquid lens focusing and anti-shake apparatus as claimed in any of claims 1 to 5.

7. The camera module of claim 6, wherein: still including base and fixed camera lens, liquid camera lens setting is in the base top, fixed camera lens connect on the base, and be located the liquid camera lens below, the SMA actuator is connected on the base, just the adjustable ring is in liquid camera lens with between the fixed camera lens.

8. The camera module of claim 7, wherein: still including adjusting part, adjusting part is including adjusting seat and spring, it is done by the driving piece adjust the seat, the spring with adjust seat fixed connection, the spring is equipped with a plurality of second elastic arms, the one end of second elastic arm with the base is connected, the second elastic arm makes the spring support adjust the seat and make it is relative to adjust the seat the base is movable.

9. An electronic device, characterized in that: comprising a liquid lens focusing and anti-shake apparatus as claimed in 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.