CN201107448Y

CN201107448Y - Camera lens drive apparatus

Info

Publication number: CN201107448Y
Application number: CNU2007201726995U
Authority: CN
Inventors: 张国际; 刘宝廷
Original assignee: Johnson Electric Shenzhen Co Ltd
Current assignee: Johnson Electric Shenzhen Co Ltd
Priority date: 2007-10-26
Filing date: 2007-10-26
Publication date: 2008-08-27
Anticipated expiration: 2017-10-26

Abstract

Belonging to the field of photographing technology, the utility model provides a lens-driving device, which comprises a moving part and a fixed part, wherein, the moving part is positioned in the fixed part and includes a lens mount, and the fixed part includes a base, on which the lens mount is positioned. A magnetizer is fixed on either the lens mount or the base, a magnet is fixed on the other component, so the magnetizer and the magnet are attracted to each other to generate magnetic force, which leads to the generation of pretightening force between the base and the lens mount; consequently, in the starting phase of a lens fixed on the lens mount, after current reaches a certain magnitude, the lens can be moved only when the electromagnetic driving force in a coil is larger than the pretightening force; in the phase when the focusing of the lens returns to zero, when the electromagnetic driving force in the coil is less than the pretightening force, the pretightening force can draw the lens back to the initial position.

Description

A kind of lens driving apparatus

Technical field

The utility model belongs to the camera technique field, relates in particular to a kind of lens driving apparatus.

Background technology

Along with science and technology development, lens driving apparatus has been applied to autofocus systems such as digital camera, mobile phone camera or Digital Video.Camera lens the unloading phase, behind the galvanization, the size of tube current all can not produce driving force, and camera lens is moved immediately in the coil; In addition, in the camera lens focusing process, camera lens need make zero, and is returned to initial position, need apply a pulling force reverse with driving force to camera lens.Therefore lens driving apparatus need provide a pretension module.

The utility model content

The technical problems to be solved in the utility model provides a kind of lens driving apparatus, can make between lens bracket and the pedestal and produce pretightning force.

In order to solve the problems of the technologies described above, the utility model provides a kind of lens driving apparatus, comprise motion parts and fixed part, motion parts is positioned at fixed part, motion parts comprises lens bracket, and fixed part comprises pedestal, and lens bracket is positioned on the pedestal, be fixed with magnetic conductor on one of them assembly of lens bracket and pedestal, be fixed with magnet on another assembly.

Owing to be fixed with magnetic conductor on lens bracket and one of them assembly of pedestal, be fixed with magnet on another assembly, therefore, by the magnetic force that attracts each other between magnetic conductor and the magnet and produce, make between pedestal and the lens bracket and produce pretightning force, thereby realize being fixed on the lens bracket camera lens the unloading phase, after electric current reached certain size, the electromagnetic actuation force in the coil could move during greater than pretightning force; The zeroth order section and camera lens is focused back, when the electromagnetic actuation force in the coil during less than pretightning force, pretightning force can spur camera lens, makes camera lens be returned to initial position.

Description of drawings

Fig. 1 is the lens driving apparatus STRUCTURE DECOMPOSITION synoptic diagram that the utility model embodiment provides;

Fig. 2 is the schematic top plan view of the lens driving apparatus that provides of the utility model embodiment;

Fig. 3 is the cross-sectional schematic of the lens driving apparatus that provides of the utility model embodiment along A-A line among Fig. 2;

Fig. 4 is the lens driving apparatus motion parts schematic perspective view that the utility model embodiment provides.

Embodiment

In order to make technical problem to be solved in the utility model, technical scheme and beneficial effect clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.

In conjunction with Fig. 1, Fig. 2 and Fig. 3, a kind of lens driving apparatus 1 that the utility model embodiment provides, comprise motion parts 21 and fixed part 22, motion parts 21 is positioned at fixed part 22, motion parts 21 comprises lens bracket 211, and fixed part 22 comprises pedestal 231, and lens bracket 211 is positioned on the pedestal 231, be fixed with magnetic conductor 11 on lens bracket 211 and pedestal 231 one of them assembly, be fixed with magnet 12 on another assembly.

Magnetic conduction iron 11 can be iron block or iron ball, and magnet 12 can be the magnetic post, and at least two pairs of iron blocks or iron ball and magnetic post are evenly arranged on lens bracket 211 and the pedestal 231.As preferred embodiment of the present utility model, the bottom of lens bracket 211 is symmetrically arranged with two grooves 111, and this magnetic conduction iron 11 is iron ball, and it is fixed in the groove 111.With the relative position of lens bracket 211 upper grooves 111, also correspondingly be symmetrically arranged with two through holes 121 on the pedestal 231, this magnet 12 is the magnetic post, and it is fixed in the through hole 121.

Difference fixed magnetizer 11 and magnet 12 on pedestal 231 and the lens bracket 211, by the magnetic force that attracts each other between magnetic conductor 11 and the magnet 12 and produce, make between pedestal 231 and the lens bracket 211 and produce pretightning force, thereby realize being fixed on the lens bracket 211 camera lens 213 the unloading phase, after electric current reaches certain size, electromagnetic actuation force in the coil could move during greater than pretightning force; The zeroth order section and camera lens 213 is focused back, when the electromagnetic actuation force in the coil during less than pretightning force, pretightning force can spur camera lens, makes camera lens 213 be returned to initial position.

Magnetic conductor 11 and magnet 12 can also be ringwise or other shapes; the quantity of magnetic conductor 11 and magnet 12 no matter what; as long as be separately fixed on the assembly in lens bracket 211 and the pedestal 231; make 12 of magnetic conductor 11 and magnet can produce pretightning force, all within protection domain of the present utility model.

As shown in figures 1 and 3, motion parts 21 also comprises coil 212 and iron hoop 214, and coil 212 is fixed on the lens bracket 211.Fixed part 22 comprises magnetic group 221 and iron-clad 222, iron-clad 222 comprises outer ring 2221 and the yoke portion 2222 that is bent inwards and extended by the top, outer ring, yoke portion 2222 is provided with and lens bracket 211 corresponding through holes, magnetic group 221 is fixed on the inboard of iron-clad 222 outer rings, iron hoop 214 abuts on the lens bracket 211, and and there is the gap between the yoke portion of iron-clad 222, iron hoop 214 and the iron-clad 222 common excitation components of forming.

When 22 motions of motion parts 21 relatively fixed parts, in order to reduce friction, between iron-clad 222 and the iron hoop 214, leave the gap between magnet 221 and the coil 212, and that iron hoop 214 and lens bracket 211 are close to is fixing very close to each other, so the gap that reduces between iron hoop 214 and the lens bracket 222 can make the volume-diminished of lens driving apparatus 2.

Coil 212 is except fixedlying connected with lens bracket 211, can also fixedly connected with iron hoop 214, like this, iron hoop 214 is between lens bracket 211 and coil 212, further eliminated the gap between coil 212 and the iron hoop 211, the volume of lens driving apparatus 1 can further be reduced.

As shown in Figure 4, lens driving apparatus 1 also comprises upper spring sheet 232 and lower spring sheet 233, the inner ring of upper spring sheet 232 and lower spring sheet 233 is connected with the two ends lead-in wire of coil 212 respectively, contact chip 234 is all arranged on the outer ring of upper spring sheet 232 and lower spring sheet 233, and upper spring sheet 232 is connected with pedestal 231 by contact chip 234 with lower spring sheet 233.When giving

upper spring sheet

232 and 233 energisings of lower spring sheet, electric current can import in the inner ring by the outer ring of two spring leafs, thereby gives coil 212 energisings, plays the effect of lead.In addition, when coil 212 energisings drive lens bracket 211 motions, two spring leafs 232,233 deform, produce elastic force, during Spring balanced that electromagnetic force in the coil 212 and two spring leafs 232,233 produce, motion parts 21 will stop, so this device can pass through the Control current size, come the displacement of controlled motion part 21.

The number of magnetic group 211 can have several or magnetic group 211 ringwise, and iron-clad 222 circumferentially can be rounded, rectangle or other shapes, and the circular port at iron-clad 222 tops can also be square or other can hold the shape of iron hoop 214.

The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.

Claims

1, a kind of lens driving apparatus, comprise motion parts and fixed part, motion parts is positioned at fixed part, motion parts comprises lens bracket, fixed part comprises pedestal, lens bracket is positioned on the pedestal, it is characterized in that: be fixed with magnetic conductor on one of them assembly of described lens bracket and pedestal, be fixed with magnet on another assembly.

2, lens driving apparatus as claimed in claim 1 is characterized in that: described magnetic conductor and magnet are respectively a plurality of, and it is evenly arranged on described lens bracket and the pedestal.

3, lens driving apparatus as claimed in claim 1 or 2, it is characterized in that: the bottom of described lens bracket is provided with groove, and described magnetic conductor is fixed in the described groove, the position of corresponding lens bracket bottom groove on the described pedestal, be provided with through hole, described magnet is fixed in the described through hole.

4, lens driving apparatus as claimed in claim 1 or 2 is characterized in that: described magnetic conductor is iron block or iron ball.

5, lens driving apparatus as claimed in claim 1 or 2 is characterized in that: described magnet is the magnetic post.

6, lens driving apparatus as claimed in claim 1 is characterized in that: described magnetic conductor is an annular magnetizer, and described magnet is ring-shaped magnet.

7, lens driving apparatus as claimed in claim 1 is characterized in that: described motion parts also comprises coil and iron hoop, and coil stationary is on described lens bracket; Described fixed part comprises magnetic group and iron-clad, iron-clad comprises outer ring and the yoke portion that is bent inwards and extended by the top, outer ring, yoke portion is provided with and the corresponding through hole of described lens bracket, the magnetic group is fixed on the inboard of iron-clad outer ring, iron hoop abuts on the described lens bracket, and and having the gap between the yoke portion of described iron-clad, described iron-clad and iron hoop are formed excitation component jointly.

8, lens driving apparatus as claimed in claim 7 is characterized in that: described coil also is posted by connecting with described iron hoop, and iron hoop is between described coil and lens bracket.

9, as claim 7 or 8 described lens driving apparatus, it is characterized in that: described lens driving apparatus also comprises upper spring sheet and lower spring sheet, the inner ring of upper spring sheet and lower spring sheet is connected with the two ends lead-in wire of described coil respectively, contact chip is all arranged on the outer ring of upper spring sheet and lower spring sheet, and the upper spring sheet is connected with pedestal by contact chip with the lower spring sheet.