CN2747596Y

CN2747596Y - Lens adjusting driving mechanism

Info

Publication number: CN2747596Y
Application number: CN 200420094328
Authority: CN
Inventors: 陈天庆
Original assignee: Yujing Optoelectronics Xiamen Co ltd
Current assignee: Yujing Optoelectronics Xiamen Co ltd
Priority date: 2004-10-19
Filing date: 2004-10-19
Publication date: 2005-12-21
Anticipated expiration: 2014-10-19

Abstract

The utility model discloses a lens adjusting driving mechanism which is arranged between the upper lid and the base of the lens module assembly structure and connects to the camera lenses and a stepper motor. The driving mechanism comprises a worm screw and a worm gear which are in mesh. The worm screw is fixed to the output shaft of the stepper motor, and an arc guide face is arranged on the worm gear. A projection is arranged on the lens mount of the camera lenses and is in contact with the arc guide face of the worm gear. Because the adjusting driving mechanism is reduced to two components from four components of normal articles, the lens can be driven to move up and down to carry out the focusing movement only by a worm screw and a worm gear. Compared with the driving mechanism of the normal article, the lens adjusting driving mechanism has few components and simple structure. Simultaneously, the few components mean that the driven kinetic loss is small, so the lens adjusting driving mechanism is low in cost and accurate in focusing.

Description

The camera adjusting gear train

Technical field

The utility model relates to a kind of autofocus lens module, is meant the camera adjusting gear train especially.

Background technology

Have the autofocus lens module, use comparatively widely at present.As shown in Figure 1, 2, existing common autofocus lens module is to be fixed with a step motor 4 ' on base 2 ', step motor 4 ' external control circuit, and a gear train 5 ' connects step motor 4 ' and lens group 3 '; Gear train 5 ' is to comprise the worm screw 51 ' that is meshed, worm gear 52 ', screw mandrel 53 ' and connection guide block 54 ', worm screw 51 ' is fixed on the output shaft 41 ' of step motor 4 ', worm gear 52 ' is to be fixed on screw mandrel 53 ' bottom, screw mandrel 53 ' is to be movably set on the fixed leg 7 ', the top peripheral hardware screw thread 531 ' of screw mandrel 53 ', connecting guide block 54 ' one end is fixed on the lens group 3 ', the external thread 531 ' that the other end is placed on this screw mandrel 53 ' upward and with its activity is spirally connected, and lens group 3 ' is fixed between base 2 ' and the loam cake 1 ' by the 6 ' activity of two guide pillars, and can move up and down to realize the function of focusing along this guide pillar 6 '.When connecting control circuit, step motor 4 ' rotates, driving worm screw 51 ' simultaneously rotates, worm screw 51 ' drives worm gear 52 ' and rotates, worm gear 52 ' rotates and then drives screw mandrel 53 ' rotation, when screw mandrel 53 ' rotates, is that spiral shell is located on the external thread 531 ' of screw mandrel 53 ' owing to connect guide block 54 ', connecting guide block 54 ' can move up and down along the screw thread 531 ' of this screw mandrel 53 ', drives lens group simultaneously and moves up and down along guide pillar and finish the automatic focusing action.

The detailed focusing action of seeing said structure, it is regulated gear train and includes worm screw, worm gear, screw mandrel and connect four parts of guide block, during step motor work, four parts are synchronized with the movement and can promote the automatic focusing function that camera lens moves up and down the realization camera lens thus, therefore the parts of whole adjusting gear train are many, the structure relative complex, cost is higher; And it is big to adjust the loss of action transferring power, and the precision of focusing is affected.

The utility model content

The purpose of this utility model provides a kind of simple in structure, little camera adjusting gear train of focusing kinetic equation loss.

For achieving the above object, solution of the present utility model is: a kind of camera adjusting gear train, be provided in a side of between the loam cake and pedestal of camera lens modular structure, it connects lens group and step motor, wherein this gear train is to comprise a worm screw and a worm gear that is meshed, and worm screw is to be fixed on the output shaft of step motor, and worm gear is provided with the arc guide face, be provided with projection on the lens mount of lens group, projection contacts with arc guide face on the worm gear all the time.

Projection below on the lens mount is provided with and the contacted protruding grain of arc guide face.

Between camera lens and loam cake, be equipped with a shell fragment to guarantee that protruding grain contacts with arc guide face on the worm gear all the time.

After adopting such scheme, gear train of the present utility model is reduced to two parts by four parts commonly using product, only can drive the focusing action that camera lens moves up and down by a worm and wormwheel, and it commonly uses the gear train of product relatively, and parts are few simple in structure; Simultaneously, the kinetic equation loss of few its transmission of parts is little, so its cost is low and the focusing accurate.

Description of drawings

Fig. 1 is an outside drawing of commonly using product camera lens modular structure;

Fig. 2 is a three-dimensional exploded view of commonly using product camera lens modular structure;

Fig. 3 is a three-dimensional exploded view of the present utility model;

Fig. 4 is a part combination synoptic diagram of the present utility model;

Fig. 5 is a camera lens action synoptic diagram of the present utility model.

Embodiment

As shown in Figure 3, camera lens modular structure of the present utility model, it mainly comprises a loam cake 1, a pedestal 2, a lens group 3, a step motor 4 and an adjusting gear train 5.

A light hole 11 is offered in the position of corresponding lens group 3 on the loam cake 1, so that camera lens stretches out;

Loam cake 1 fastens the back with pedestal 2 and constitutes a box space, and above-mentioned parts are to place in this box space.

Lens group 3 comprises camera lens 31 and lens mount 32, camera lens 31 is to be fixed on the lens mount 32, lens mount 32 peripheral hardwares two lugs 321, two lugs 321 activity respectively are nested with on guide pillar 6, make lens mount 32 do axial moving up and down along this guide pillar 6, the two ends of guide pillar 6 are to be fixed on loam cake 1 and the pedestal 2, go back the outer projection 322 that is provided with in addition on the lens mount 32, and projection 322 belows are provided with a protruding grain 3221;

Step motor 4 is to be fixed on the pedestal 2 its external control circuit;

Regulate gear train 5 and comprise a worm screw 51 and a worm gear 52 that is meshed, worm screw 51 is to be fixed on the output shaft 41 of step motor 4, worm gear 52 is provided with arc guide face 521, this arc guide face 521 contacts with the protruding grain 3221 of above-mentioned lens mount 32 projections 322 all the time, this worm gear 52 is that activity is nested with on a guide pillar 7, this worm gear 52 is to rotate on guide pillar 7, and the two ends of guide pillar 7 are to be fixed on loam cake 1 and the base 2.

On lens mount 32, also be provided with the lug 323 that matches with optical interruption device 8 in addition, inserted sheet 81 external control circuits of optical interruption device 8 wherein, the position of corresponding lens group 3 also is provided with sensor below pedestal 2.

As shown in Figure 4, when this camera lens modular structure makes up, step motor 4 is fixed on the appropriate location of pedestal 2, worm screw 51 is fixed on the output shaft 41 of step motor 4, worm gear 52 is meshed the back by between guide pillar 7 fixed pedestals 2 and the loam cake 1 with worm screw 51, and the protruding grain on the projection 321 of lens mount 32 3221 contacts with arc guide face 521 on the worm gear 52 and afterwards is fixed between loam cake 1 and the pedestal 2 by two guide pillars 6 in the lens group 3.,, between lens group 3 and loam cake 1, add a shell fragment 9 for the projection 322 epirelief grains 3221 that guarantee lens mount 32 contact with the arc guide face 521 of worm gear 52 all the time.

As shown in Figure 5, when camera lens modular structure of the present utility model is taken work, connect control circuit, step motor 4 rotates, its output shaft 41 can drive worm screw 51 and rotate, and worm screw 51 drives worm gear 52 rotations simultaneously, and then worm gear 52 is when rotating, the protruding grain 3221 of lens mount 32 is to move along the arc guide face 521 on the worm gear 52, and this arc guide face 521 just can promote camera lens 3 and move up and down to realize the function of camera lens focusing along guide pillar 6.

Claims

1, a kind of camera adjusting gear train, be provided in a side of between the loam cake and pedestal of camera lens modular structure, it connects lens group and step motor, it is characterized in that: this adjusting gear train is to comprise a worm screw and a worm gear that is meshed, worm screw is to be fixed on the output shaft of step motor, and worm gear is provided with the arc guide face, is provided with projection on the lens mount of lens group, and projection contacts with arc guide face on the worm gear all the time.

2, camera adjusting gear train as claimed in claim 1 is characterized in that: the projection below on the above-mentioned lens mount is provided with and the contacted protruding grain of above-mentioned arc guide face.

3, camera adjusting gear train as claimed in claim 1 is characterized in that: be equipped with a shell fragment to guarantee that protruding grain contacts with arc guide face on the worm gear all the time between above-mentioned camera lens and above-mentioned loam cake.