CN102457153A

CN102457153A - Voice coil motor

Info

Publication number: CN102457153A
Application number: CN2010105129006A
Authority: CN
Inventors: 江舜凡
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2010-10-20
Filing date: 2010-10-20
Publication date: 2012-05-16
Anticipated expiration: 2030-10-20
Also published as: CN102457153B

Abstract

A voice coil motor comprises a fixed unit, a movable unit, a spring plate, a bearing body and a cover body, wherein the fixed unit comprises a fixed frame, the movable unit comprises a cylinder, the movable unit is movably arranged in the fixed unit, the elastic sheet is fixed on the fixed frame and connected with the movable unit, one end of the fixing frame for fixing the elastic sheet is fixed on the bearing body, the cover body is fixed at one end of the fixing frame far away from the elastic sheet, the voice coil motor further comprises at least one ball, one surface of the fixed frame, which is close to the cover body, is provided with a first groove, one surface of the cover body close to the fixing frame is provided with a second groove, and the ball can be arranged in an accommodating space defined by the first groove and the second groove in a rolling mode and is abutted against the barrel so that friction force can be generated between the ball and the barrel, and the barrel can be kept at a focusing position under the condition of no electromagnetic force.

Description

Voice coil motor

Technical field

The present invention is about a kind of voice coil motor.

Background technology

(Voice Coil Motor VCM) has that volume is little, power consumption reaches advantages such as cheap less to voice coil motor, is suitable as the driver in the electronic product (like digital camera, mobile phone, DV etc.).

Common voice coil motor mainly comprises a fixed mount and a fitted tube and an at least one shell fragment that is installed in movably in this fixed mount.This fitted tube is used for installing lens barrel or assemblies such as focusing lens set or zoom lens set, and this shell fragment is used for protecting voice coil motor and provides fitted tube to reply the restoring force in home position.Under the situation of energising, this voice coil motor drives fitted tube, thereby changes the distance between lens barrel or focusing lens set or zoom lens set and the image sensor, and then realizes the function of focusing or zoom.

Above-mentioned voice coil motor must constantly provide electric current to remain on fixing position by fitted tube, thereby make in Dynamic Photography to defocused, needs to consume too many electric energy.

Summary of the invention

When in view of this, being necessary a kind of the focusing is provided without the voice coil motor of electric current.

A kind of voice coil motor; It comprises fixed cell, active unit, shell fragment, supporting body and lid; Said fixed cell comprises fixed mount; Said active unit comprises fitted tube, and said active unit is arranged in the said fixed cell versatilely, and said shell fragment is fixed on said fixed mount and links to each other with said active unit; One end of the fixing said shell fragment of said fixed mount is fixed on the said supporting body; Said lid is fixed on the end of said fixed mount away from said shell fragment, and said voice coil motor further comprises at least one ball, and said fixed mount has first groove near the one side of said lid; Said lid has second groove near the one side of said fixed mount, thus said ball rollably be arranged at the common receiving space that limits of said first groove and second groove and and said fitted tube connect and make said fitted tube under the condition that does not have the electromagnetic force effect, to remain on focusing position so that can produce frictional force between said ball and the said fitted tube.

Compared to prior art, when the voice coil motor of the embodiment of the invention drives the focusing of camera lens module, through shell fragment to coil electricity; Produce Lorentz force between the coil of energising and the magnet, make active unit move to the direction away from supporting body, ball also can be followed together and rotate this moment; When to defocused, cut off electric current, the frictional force between ball and the fitted tube makes active unit rest at a distance at this moment; And can not be returned to the home position downwards because of the effect of shell fragment; When shell fragment provided reverse current to coil, active unit just can be got back to the home position, carried out focusing operation next time.

Description of drawings

Fig. 1 is the sketch map of embodiment of the invention voice coil motor.

Fig. 2 is the exploded view of embodiment of the invention voice coil motor.

Fig. 3 is along the schematic cross-section of III-III direction among Fig. 1.

The main element symbol description

Voice coil motor 1

Fixed cell 10

First receiving space 100

Fixed mount 11

Reference column 110

First groove 111

Magnet 12

Active unit 20

Second receiving space 200

Internal thread 201

Fitted tube 21

Tangent plane 210

Coil 22

Shell fragment 30

Through hole 310

Lid 40

Location hole 410

Second groove 411

Supporting body 50

Projection 510

Ball 60

Embodiment

To combine accompanying drawing that the present invention is done further explain below.

See also Fig. 1, Fig. 2 and shown in Figure 3, the voice coil motor 1 that the embodiment of the invention provides is used for driving camera lens module (figure does not show) to realize focusing.

Voice coil motor 1 comprises fixed cell 10, active unit 20, shell fragment 30, lid 40, supporting body 50 and ball 60, and lid 40 limits a space with supporting body 50 and is used for accommodating fixed cell 10, active unit 20 and shell fragment 30.

Fixed cell 10 comprises a fixed mount 11 and the four packaged magnet of being located on the fixed mount 11 12.Fixed mount 11 is the roughly support bodys of the side's of being tubular, and it has one first receiving space 100 and is used to accommodate active unit 20, the first receiving spaces 100 and has a central axis L, the optical axis coincidence of central axis L and camera lens module.

Fixed mount 11 has a reference column 110 and one first groove 111 respectively on four angles near an end of lid 40; The parallel central axis L of the length direction of reference column 110; First groove 111 is towards first receiving space 100, and promptly fixed mount 11 has four reference columns 110 and four first grooves 111.

For with fixed mount 11 on reference column 110, first groove 111 match; Have four location holes 410 and four second grooves 411 on the lid 40; Reference column 110 stretches into location hole 410 and by gluing process lid 40 is fixed on the fixed mount 11, and first groove 111 and receiving space of second groove, 411 common qualifications are used for accommodating ball 60.

Certainly, fixed mount 11 also can have one first groove 111 respectively with lid 40 and one second groove 411, the first grooves 111 also can not be arranged on the angle of fixed mount 11, and is arranged on the seamed edge.

Active unit 20 is installed in first receiving space 100 of fixed cell 10 versatilely, and it can move up and down in fixed mount 11.Active unit 20 comprises a fitted tube 21 and is around in the coil 22 on fitted tube 21 outer walls; Fitted tube 21 has one second receiving space 200; Second receiving space 200 has internal thread 201; Internal thread 201 is used for making the camera lens module be fixed in second receiving space 200 with the screw thread bolt of camera lens module; Central axis L moves up and down and realizes the focusing operation in the drive lower edge of active unit 20 thereby make the camera lens module, and the central shaft of second receiving space 200 also is the central axis L of first receiving space 100.

Corresponding four first grooves 111 and second groove 411, the quantity of ball 60 is four, a part of accommodating a ball 60 and ball 60 in the receiving space that promptly each first groove 111 and each second groove 411 are limited is positioned at receiving space.

Ball 60 is a cylindrical shape, the central axis L of its central shaft approximate vertical second receiving space 200.

Certainly; The central shaft of ball 60 might not vertical second receiving space 200 central axis L; As long as guarantee ball 60 fitted tube 21 rotations relatively, for example, have the angle of 45 degree, 60 degree or 75 degree between the central axis L of the central shaft of ball 60 and second receiving space 200.

The variation of corresponding first groove 111 and second groove, 411 quantity, the quantity of ball 60 also need suitably to change, and when first groove 111 and second groove 411 were a plurality of, ball 60 can be one.

Four angles of fitted tube 21 have tangent plane 210, and ball 60 applying tangent planes 210 make can produce frictional force between ball 60 and the fitted tube 21.In addition, in the present embodiment, ball 60 rollably be embedded between lid 40, fixed mount 11 and the fitted tube 21 and with lid 40, fixed mount 11 and fitted tube 21 between all contact, and can produce frictional force between ball 60 and lid 40, fixed mount 11 and the fitted tube 21.

When first groove 111 was two, in order to guarantee the stress equalization between fitted tube 21 and the ball 60, first groove 111 should for example, be arranged on the diagonal of fixed mount 11 about the central axis L symmetry of first receiving space 100.

Shell fragment 30 roughly is square, and four corners of its periphery have a through hole 310 respectively, are fixed on the fitted tube 21 through a glue processing procedure in interior week, and shell fragment 30 is used for providing electric current and active unit 20 to get back to the restoring force in home position to coil 22.

Supporting body 50 also is a square structure, and corresponding through hole 310 has projection 510 on the supporting body 50, and projection 510 inserts through hole 310 makes projection 510 be fixed in the through hole 310 by glue then.

When voice coil motor 1 focusing; Through 22 energisings of 30 pairs of coils of shell fragment, produce Lorentz force (Lorenz Force) between the coil 22 of energising and the magnet 12, make active unit 20 move to direction away from supporting body 50 along central axis L; Because ball 60 is embedded between fixed mount 11, lid 40 and fitted tube 21 and contact is all arranged with it; Therefore, when fitted tube 21 moved, the frictional force that produces between ball 60 and the fitted tube 21 made ball 60 rotate along with moving of fitted tube 21; When to defocused, cut off electric current, under the effect of shell fragment 30; Active unit 20 answer home positions, the stiction between ball 60 and the fitted tube 21 makes active unit 20 rest on the focusing position place at this moment, and can not be returned to the home position downwards because of the effect of shell fragment 30; When shell fragment 30 provides reverse current to coil 22; Lorentz force overcomes the frictional force between ball 60 and the fitted tube 21, and active unit 20 just can be got back to the home position, carries out focusing operation next time.

It is understandable that those skilled in the art also can do other variation etc. and be used for design of the present invention in spirit of the present invention, as long as it does not depart from technique effect of the present invention and all can.These all should be included within the present invention's scope required for protection according to the variation that the present invention's spirit is done.

Claims

1. voice coil motor; It comprises fixed cell, active unit, shell fragment, supporting body and lid; Said fixed cell comprises fixed mount, and said active unit comprises fitted tube, and said active unit is arranged in the said fixed cell versatilely; Said shell fragment is fixed on said fixed mount and links to each other with said active unit; One end of the fixing said shell fragment of said fixed mount is fixed on the said supporting body, and said lid is fixed on the end of said fixed mount away from said shell fragment, it is characterized in that; Said voice coil motor further comprises at least one ball; Said fixed mount has first groove near the one side of said lid, and said lid has second groove near the one side of said fixed mount, thus said ball rollably be arranged at the common receiving space that limits of said first groove and second groove and and said fitted tube connect and make said fitted tube under the condition that does not have the electromagnetic force effect, to remain on focusing position so that can produce frictional force between said ball and the said fitted tube.

2. voice coil motor as claimed in claim 1 is characterized in that said fixed cell further comprises the magnet that is arranged on the said fixed mount.

3. voice coil motor as claimed in claim 1 is characterized in that, said active unit further comprises the coil around said fitted tube.

4. voice coil motor as claimed in claim 1 is characterized in that, said fixed mount has reference column near an end of said lid, and said lid has location hole, and said lid is fixed on the said fixed mount by said location hole and reference column.

5. like each described voice coil motor of claim 1 to 4, it is characterized in that said ball is cylindrical.

6. voice coil motor as claimed in claim 5 is characterized in that said supporting body has projection, and said shell fragment has the through hole that matches with said projection.

7. voice coil motor as claimed in claim 5 is characterized in that said fixed mount has first receiving space, and said active unit is provided with in said first receiving space versatilely.

8. voice coil motor as claimed in claim 5 is characterized in that said fitted tube has second receiving space, and said second receiving space has a central shaft, the central shaft of said second receiving space of central shaft approximate vertical of said ball.

9. voice coil motor as claimed in claim 8 is characterized in that, said second receiving space has screw thread and is used for and camera lens module bolt.

10. voice coil motor as claimed in claim 5 is characterized in that said fixed mount roughly is square, and said first groove is two and is arranged on the diagonal of said fixed mount.