WO2019178917A1

WO2019178917A1 - Voice coil motor for driving liquid lens and lens set thereof

Info

Publication number: WO2019178917A1
Application number: PCT/CN2018/084662
Authority: WO
Inventors: 刘志远; 洪航庆
Original assignee: 爱佩仪（东莞）光电科技有限公司
Priority date: 2018-03-21
Filing date: 2018-04-26
Publication date: 2019-09-26
Also published as: CN110297377A

Abstract

The present invention relates to a lens driving device, and in particular, to a voice coil motor for driving a liquid lens and a lens set thereof. The voice coil motor for driving the liquid lens comprises a seat body, a carrier, and a driving device; the seat body is provided with a first accommodating cavity and a second accommodating cavity which are distributed along an optical axis and are used for fixing a first lens and the liquid lens respectively; the carrier is provided in the first accommodating cavity, a transmission component is fixedly provided on the carrier, and an extrusion part of the transmission component is fixed to a side surface of the liquid lens close to the first lens; the driving device is provided in the first accommodating cavity, and comprises a rotor and a stator which is in magnetic induction with the rotor and drives the rotor to move up and down along the optical axis; the stator is fixedly provided on the seat body; the rotor is fixed to the carrier; the transmission component is fixed on the carrier and moves up and down along the optical axis with the carrier for adjusting the curvature of the liquid lens. The technical problem to be solved by the present invention is to drive the liquid lens to realize optical anti-shake and auto focus functions.

Description

Voice coil motor driving liquid lens and lens group thereof

Technical field

The present invention relates to a lens driving device, and more particularly to a voice coil motor for driving a liquid lens and a lens group thereof.

Background technique

Auto Focus is based on the principle of object light reflection. The reflected light is received by the sensor CCD on the camera. The method of computer processing and driving the electric focus device to focus is called auto focus.

Autofocus technology has been widely used in imaging fields such as cameras, camcorders, and image scanning. In the prior art, fixed-focus lenses generally use a motor as a power source to drive the fixed-focus lens to achieve zooming and focusing, and the positioning is accurate.

In order to meet the demand for miniaturization of portable imaging devices, in recent years, a liquid lens has been newly developed, which mainly changes the curvature change of the interface of the liquid body by applying a voltage to a chamber containing the liquid, and the liquid lens can achieve a super close distance. The focus is not caused by the optical resolution compensation when the optical image stabilization compensation is performed. However, current liquid lens driving devices can only achieve autofocus, and optical anti-shake function cannot be realized.

Summary of the invention

Therefore, the technical problem to be solved by the present invention is that only the autofocus can be realized in the current liquid lens driving device, and the optical anti-shake function cannot be realized, thereby providing a voice coil for driving the liquid lens simultaneously implementing the autofocus and the optical anti-shake function. Motor and its lens set.

In order to solve the above technical problem, a voice coil motor for driving a liquid lens of the present invention includes

a seat body having a first receiving cavity and a second receiving cavity distributed along the optical axis for respectively fixing the first lens and the liquid lens;

a carrier disposed in the first accommodating cavity, wherein the carrier is fixedly disposed with a transmission component, and the pressing portion of the transmission component is fixedly disposed adjacent to a side of the liquid lens adjacent to the first lens;

a driving device, disposed in the first receiving cavity, includes a mover and a stator that magnetically senses and moves the mover along the optical axis, and the stator is fixedly disposed on the seat body The mover is fixedly disposed with the carrier, and the transmission member is fixed on the carrier and moves up and down along the optical axis of the carrier for adjusting the curvature of the liquid lens. The mover is composed of two or more toroidal coils, each of which The axes of the toroidal coils are fixed on the carrier perpendicular to the optical axis; each of the toroidal coils is independently controlled, and is used for automatically focusing the liquid lens when the driving force of the same magnitude and direction is generated for the carrier. That is, when the autofocus signal is received, the driving device drives the carrier to move up and down in the direction of the optical axis; when generating a driving force different in magnitude and/or direction to the carrier, for autofocus and/or optics Anti-shake, that is, when the anti-shake signal is received, the driving device drives the carrier to generate reverse deflection to compensate for image shift caused by jitter, and when the anti-shake and auto-focus signals are received simultaneously, the driving device is installed. Driving said carrier to create a reverse deflection caused by shift shake compensated image and driving the carrier to move up and down along the optical axis direction synergistic effect.

When the mover is two toroidal coils, the two toroidal coils are orthogonally distributed around the optical axis; when the mover is three or more toroidal coils, the toroidal coils are evenly distributed around the optical axis.

The stator is a magnet group having the same number as the number of the toroidal coils, and one-to-one correspondingly disposed outside the toroidal coil.

The magnet group includes a first magnet and a second magnet disposed in the optical axis direction and having opposite polarities, one half of the loop coil is disposed within a sensing range of the first magnet, and the other half of the loop coil is located at a Within the sensing range of the two magnets.

The base body includes a metal yoke disposed outside the stator and the mover for preventing magnetic flux leakage.

The base body includes a bracket sequentially disposed along the optical axis and a lower cover fixedly disposed with the bracket, and the bracket is provided with an internal thread that cooperates with the first lens, and the stator is fixed on the lower cover.

The base body further includes a metal yoke disposed outside the stator and the mover for preventing magnetic flux leakage, the metal yoke being fixedly disposed with the lower cover.

The transmission member has a fixing portion fixed to the seat body, and the pressing portion is a convex ring that protrudes toward the liquid lens.

The carrier is made of a non-magnetically permeable material.

The carrier is formed with a protrusion extending perpendicular to the optical axis direction, and an inner ring of the toroidal coil is fixedly engaged with the protrusion.

A reset member is disposed on the carrier, and a restoring force is applied to the carrier to reset it to an initial position.

The reset member is a leaf spring, and the leaf spring includes an inner ring, an outer ring and a spring arm connecting the inner ring and the outer ring, the inner ring is fixedly disposed with the carrier, and the outer ring is fixed at On the seat.

The reset member includes two leaf springs respectively disposed on two sides of the carrier perpendicular to the optical axis, and the outer ring is fixed between the seat body and the stator.

The first lens is a fixed focus lens.

A lens group having any of the above-described voice coil motors, comprising a first lens and a liquid lens, the first lens being fixed in a first housing chamber of the voice coil motor, and the liquid lens being fixed to the voice coil motor The second receiving chamber is inside.

The above technical solution of the present invention has the following advantages over the prior art.

1. The voice coil motor for driving a liquid lens according to the present invention, comprising a base body, a carrier and a driving device, the base body having a first receiving cavity distributed along the optical axis for respectively fixing the first lens and the liquid lens And a second accommodating cavity; the carrier is disposed in the first accommodating cavity, the carrier is fixedly disposed with a transmission component, and the pressing portion of the transmission component is fixedly disposed adjacent to a side of the liquid lens adjacent to the first lens; Provided in the first accommodating cavity, comprising a mover and a stator magnetically sensing with the mover and driving the mover to move up and down along the optical axis, the stator is fixedly disposed on the base, the transmission component Fixed on the carrier, moving up and down along the optical axis of the carrier for adjusting the curvature of the liquid lens, the mover being composed of two or more toroidal coils, the axis of each of the toroidal coils being fixed perpendicular to the optical axis The carrier is independently controlled, and is used for automatically focusing the liquid lens when the driving force of the same magnitude and direction is generated for the carrier, that is, when the autofocus signal is received, The driving device drives the carrier to move up and down in the direction of the optical axis; when generating a driving force different in magnitude and/or direction to the carrier, for autofocusing and/or optical image stabilization, that is, when receiving an anti-shake signal The driving device drives the carrier to generate a reverse deflection to compensate for image shift caused by the jitter. When receiving the simultaneous anti-shake and auto-focus signals, the driving device drives the carrier to generate a reverse deflection to compensate for the jitter. The image is offset and drives a superimposing effect of the carrier moving up and down in the direction of the optical axis. The voice coil motor fixes the first lens, and the magnetic force of the mover and the stator causes the mover to generate a force along the optical axis direction. Independent control of the toroidal coil, the mover drives the carrier to move together to drive the transmission component to squeeze the movable part of the bottom of the liquid lens, so that the curvature of the liquid lens changes to achieve the purpose of focusing and anti-shake, and the lens can be focused in real time. And / or optical image stabilization.

2. In the voice coil motor for driving a liquid lens according to the present invention, the stator is a magnet group having the same number as the number of the loop coils, and one-to-one correspondingly disposed outside the loop coil.

3. In the voice coil motor for driving a liquid lens according to the present invention, the carrier is made of a non-magnetic material, and the abnormal operation of the motor caused by the magnetic interference between the motors is not generated during use. The problem of magnetic interference in the double-lens optical anti-shake lens in the prior art is solved.

4. In the voice coil motor for driving a liquid lens according to the present invention, the carrier is formed with a protrusion extending perpendicular to the optical axis direction, and the inner ring of the toroidal coil is fixedly fitted with the protrusion, and the structure Simple and reliable.

5. In the voice coil motor for driving a liquid lens according to the present invention, the carrier is provided with a reset member to which a reset force for resetting to the initial position is applied, and the stator and the stator are not required to be reset. The mover senses to move the reply, further saving power consumption.

DRAWINGS

In order to make the content of the present invention easier to understand, the present invention will be further described in detail below with reference to the accompanying drawings

1 is an exploded view of a voice coil motor according to an embodiment of the present invention;

Figure 2 is an axial cross-sectional view of a voice coil motor according to an embodiment of the present invention;

3 is a schematic view of the lens group in another embodiment of the present invention;

Figure 4 is a schematic view showing the focus state of the lens group of Figure 3 in the present invention;

Fig. 5 is a schematic view showing the anti-shake state of the lens group of Fig. 3 in the present invention.

Reference numerals in the figures are denoted as: 1-bracket, 2-first lens, 3-lower cover, 4-first leaf spring, 5-first magnet, 6-second magnet, 7-transmission component, 8- Liquid lens, 9-loop coil, 10-carrier, 11-second sheet spring, 12-metal yoke.

The optical axis is the line passing through the center of the lens.

detailed description

1 and 2 show a voice coil motor for driving a liquid lens 8 in the embodiment, which comprises a base body, a carrier 10 and a driving device. The base body has a distribution along the optical axis for respectively fixing the first lens 2 and the liquid state. a first accommodating cavity and a second accommodating cavity of the lens 8; the carrier 10 is disposed in the first accommodating cavity, and the transmission member 7 is fixedly disposed on the carrier 10, and the pressing portion of the transmission component 7 and the liquid lens 8 are adjacent to the first lens 2 The driving device is disposed in the first receiving cavity, and includes a mover and a stator that magnetically senses with the mover and drives the mover to move up and down along the optical axis. The stator is fixedly disposed on the base body, and the mover and the carrier 10 are fixedly disposed. The transmission member 7 is fixed on the carrier 10 and moves up and down along the optical axis with the carrier 10 for adjusting the curvature of the liquid lens 8. The voice coil motor of the present invention fixes the first lens 2, and the magnetic induction of the mover and the stator causes the mover to generate light along the light. In the axial direction, the mover drives the carrier 10 to move together to drive the transmission member 7 to press the movable portion at the bottom of the liquid lens 8, so that the curvature of the liquid lens 8 is changed to achieve the purpose of focusing and anti-shake.

In this embodiment, the mover is composed of four toroidal coils 9, the axis of each of the toroidal coils 9 is fixed perpendicularly to the optical axis on the carrier 10, and the toroidal coils 9 are evenly distributed around the optical axis; the respective toroidal coils 9 are independently controlled, When the carrier 10 is driven by the same magnitude and direction, it is used for autofocusing the liquid lens 8; when the driving force of the carrier 10 is different in magnitude and/or direction, it is used for autofocus and/or optical image stabilization, that is, Through independent control of the toroidal coil 9, according to the application environment of the lens, the lens can be focused or optically anti-shake in real time, that is, the voice coil motor can control the size and direction of the driving force according to the actual use condition by independent control of the toroidal coil 9. Achieving autofocus and optical image stabilization, the drive device drives the carrier 10 to generate reverse deflection to compensate for image shift caused by jitter, and/or when receiving an autofocus signal, when the anti-shake signal is received The driving device drives 10 the carrier to move up and down in the direction of the optical axis.

Of course, the mover can also be replaced with three or more toroidal coils 9, and when there are three or more toroidal coils 9, the toroidal coils 9 are evenly distributed around the optical axis.

Regardless of the number of the movers, in the present embodiment, the stator is a magnet group having the same number as the number of the toroidal coils 9, one-to-one correspondingly disposed outside the toroidal coil 9. The magnet group includes a first magnet 5 and a second magnet 6 which are disposed in the optical axis direction and are opposite in polarity, one half of the loop coil 9 is disposed within the sensing range of the first magnet 5, and the other half of the loop coil 9 is located at the second The sensing range of the magnet 6 is within. Of course, the stator can also be replaced by a ring magnet set that surrounds the rotor.

The base body includes a bracket 1 disposed in sequence along the optical axis and a lower cover 3 fixedly disposed with the bracket 1. The bracket 1 is provided with an internal thread that cooperates with the first lens 2, and the stator is fixed to the lower cover 3.

Further, in the present embodiment, on the basis of the above embodiment, the base further includes a metal yoke 12 disposed outside the stator and the mover for preventing magnetic leakage, and the metal yoke 12 and the lower cover 3 are fixedly disposed.

The transmission member 7 has a fixing portion fixed to the seat body, and the pressing portion is a convex ring that protrudes toward the liquid lens 8.

The carrier 10 is made of a non-magnetic material, and may be a plastic part, a rubber part or a plastic part, which does not cause a malfunction of the motor caused by a magnetic interference problem between the motors during use.

The carrier 10 can also be formed with a protrusion extending perpendicular to the optical axis direction, and the inner ring of the toroidal coil 9 is fixedly fitted with the protrusion, and has a simple structure and a reliable fixing manner.

A reset member may be disposed on the carrier 10, and a resetting force is applied to the carrier 10 to reset it to the initial position. When the reset is performed, the stator and the mover induction may not be required to move the recovery, thereby further saving power consumption. In this embodiment, the reset member includes two leaf springs, that is, a first leaf spring 4 and a second leaf spring 11, and the first leaf spring 4 and the second leaf spring 11 are respectively disposed on the carrier 10 and the optical axis. On both sides of the vertical, the outer ring is fixed between the seat body and the stator. The leaf spring includes an inner ring, an outer ring and a spring arm connecting the inner ring and the outer ring. The inner ring is fixedly fixed with the carrier 10, and the outer ring is fixed. On the seat.

Of course, the reset member may not be disposed, and the reset is performed by the induction of the stator and the mover, but the power consumption is more, and only one leaf spring may be provided, but the support of the carrier 10 is not stabilized by two flap springs. However, the above embodiment is less effective but is also within the scope of the present invention.

Example 2

3 is a lens assembly according to the embodiment, which includes a first lens 2, a liquid lens 8 and a voice coil motor, and a voice coil motor including a base body, a carrier 10 and a driving device, and the base body has a distribution along the optical axis. The first lens chamber and the second housing chamber of the first lens 2 and the liquid lens 8 are fixedly disposed respectively, and the liquid lens 8 is closer to the object than the first lens, that is, the first lens is closer to the eye; the first lens 2 is fixed to the sound In the first receiving cavity of the ring motor, the liquid lens 8 is fixed in the second receiving cavity of the voice coil motor, the carrier 10 is disposed in the first receiving cavity, and the transmission member 7 is fixedly disposed on the carrier 10, and the transmission component 7 is squeezed. The portion is fixedly disposed adjacent to the liquid lens 8 on a side of the first lens 2; the driving device is disposed in the first receiving cavity, and includes a mover and a stator that magnetically senses with the mover and drives the mover to move up and down along the optical axis, and the stator is fixedly disposed at the seat. In the embodiment, the mover is fixedly disposed on the carrier 10, and the transmission member 7 is fixed on the carrier 10 to move up and down along the optical axis with the carrier 10 for adjusting the curvature of the liquid lens 8. In the embodiment, the mover is composed of two loop coils 9. Composition, two rings The loops 9 are orthogonally distributed about the optical axis, the axis of each of the loop coils 9 being fixed perpendicularly to the optical axis on the carrier 10, the transmission member 7 being fixed to the carrier 10 along with the carrier 10 The up and down movement of the shaft is used to adjust the curvature of the liquid lens 8, and each of the loop coils 9 is independently controlled to automatically focus on the liquid lens 8 when the same magnitude of driving force is generated for the carrier 10; When the carrier 10 generates driving forces of different sizes and/or directions, it is used for autofocus and/or optical image stabilization, that is, the voice coil motor of the present invention fixes the first lens 2, and the magnetic induction of the mover and the stator causes the mover to generate light along the light. In the axial direction, each of the toroidal coils 9 independently controls the movable portion of the liquid lens 8 to be driven by the transmission member 7, so that the force and direction of the liquid lens 8 are different to achieve focusing and anti-shake. Purpose, when receiving an anti-shake signal, the driving device drives the carrier 10 to generate a reverse deflection to compensate for image shift caused by jitter, as shown in FIG. 5, and/or, when an auto-focus signal is received, Drive device drive 10 The carrier moves up and down in the direction of the optical axis, as shown in FIG.

The first lens 2 may be a lens or a lens group of a plurality of lens combinations, and the first lens may be a fixed focus lens or other types of lenses.

It is apparent that the above-described embodiments are merely illustrative of the examples, and are not intended to limit the embodiments. Other variations or modifications of the various forms may be made by those skilled in the art in light of the above description. There is no need and no way to exhaust all of the implementations. Obvious changes or variations resulting therefrom are still within the scope of the invention.

Claims

A voice coil motor for driving a liquid lens, characterized in that it comprises

a seat body having a first receiving cavity and a second receiving cavity distributed along the optical axis for respectively fixing the first lens (2) and the liquid lens (8);

a carrier (10) disposed in the first receiving cavity, wherein the carrier (10) is fixedly provided with a transmission member (7), and the pressing portion of the transmission member (7) is close to the liquid lens (8) One side of a lens (2) is fixedly set;

a driving device, disposed in the first receiving cavity, includes a mover and a stator that magnetically senses and moves the mover along the optical axis, and the stator is fixedly disposed on the seat body The mover consists of two or more toroidal coils (9), the axis of each of which is fixed perpendicularly to the optical axis on the carrier (10), and the transmission member (7) is fixed in the The carrier (10) moves with the carrier (10) for adjusting the curvature of the liquid lens (8), and each of the loop coils (9) is independently controlled. When the anti-shake signal is received, the driving device drives the The carrier (10) produces a reverse deflection to compensate for image shift caused by the jitter, and/or, upon receipt of the autofocus signal, the drive device drives (10) the carrier to move up and down in the direction of the optical axis.
A voice coil motor according to claim 1, wherein when said mover is two loop coils (9), two loop coils (9) are orthogonally distributed around the optical axis; said mover is three In the case of the above toroidal coil (9), the toroidal coil (9) is evenly distributed around the optical axis.
A voice coil motor according to any one of claims 1 to 2, wherein said stator is a magnet group having the same number as said number of said toroidal coils (9), and one-to-one correspondence is provided in said toroidal coil (9) Outside.
A voice coil motor according to claim 3, wherein said magnet group includes a first magnet (5) and a second magnet (6) which are disposed in the optical axis direction and are opposite in polarity, said loop coil (9) One half of the loop is disposed within the sensing range of the first magnet (5), and the other half of the loop coil (9) is located within the sensing range of the second magnet (6).
A voice coil motor according to any one of claims 1 to 4, wherein the base body includes a metal yoke (12) disposed outside the stator and the mover for preventing magnetic flux leakage.
A voice coil motor according to any one of claims 1 to 5, characterized in that the base body comprises a bracket (1) arranged in sequence along the optical axis and a lower cover (3) fixedly arranged with the bracket (1) The bracket (1) is provided with an internal thread that cooperates with the first lens (2), and the stator is fixed on the lower cover (3).
A voice coil motor according to claim 6, wherein said base body further includes a metal yoke (12) disposed outside said stator and mover for preventing magnetic flux leakage, said metal yoke (12) ) is fixedly arranged with the lower cover (3).
A voice coil motor according to any one of claims 1 to 7, wherein said transmission member (7) has a fixing portion fixed to said seat body, said pressing portion being toward said liquid lens ( 8) Protruding convex ring.
A voice coil motor according to any of claims 1-8, characterized in that the carrier (10) is made of a non-magnetically permeable material.
A voice coil motor according to any one of claims 2-9, characterized in that the carrier (10) is formed with a projection extending perpendicular to the optical axis, and the inner ring of the toroidal coil (9) The protrusion is fixedly fitted.
The voice coil motor according to any one of claims 1 to 10, characterized in that the carrier (10) is provided with a resetting member, and the carrier (10) is applied with a restoring force for resetting it to an initial position; And/or the first lens is a fixed focus lens.
A voice coil motor according to claim 11, wherein said reset member is a leaf spring, and said leaf spring includes an inner ring, an outer ring, and a spring arm connecting the inner ring and the outer ring, The inner ring is fixedly disposed with the carrier (10), and the outer ring is fixed to the seat body.
A voice coil motor according to claim 12, wherein said reset member comprises two leaf springs respectively disposed on both sides of the carrier (10) perpendicular to the optical axis, said outer ring being fixed to said Between the seat and the stator.
A lens assembly having the voice coil motor of any of claims 1-13, characterized in that it comprises a first lens (2) and a liquid lens (8), the first lens (2) being fixed to the voice coil In the first housing chamber of the motor, a liquid lens (8) is fixed in the second housing chamber of the voice coil motor.