CN101581819A

CN101581819A - Lens module

Info

Publication number: CN101581819A
Application number: CNA200810301586XA
Authority: CN
Inventors: 陈高旗
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: 2008-05-15
Filing date: 2008-05-15
Publication date: 2009-11-18
Anticipated expiration: 2028-05-15
Also published as: CN101581819B

Abstract

The invention relates to a lens module, which comprises a fixed seat, a driving device and a lens barrel accommodated in the fixed seat. The driving device is accommodated between the lens barrel and the fixed seat, and comprises a toroidal coil stator and a rotor which at least comprises a magnetic ring. The external wall of the lens barrel is provided with external threads. The toroidal coil stator is fixed on the internal wall of the fixed seat and is provided with an accommodating space, and the rotor is accommodated in the accommodating space. The driving device further comprises a stating ring stretched out of the inside sphere of the toroidal coil stator; the rotor is connected with the inside sphere of the stating ring slidingly; and the internal wall of the rotor is also provided with internal threads which are engaged with the external threads. The lens module of the invention can drive the lens barrel to move axially without an extra transmission component. The lens barrel has uniform stress in various directions, so the lens barrel is difficultly deflected when moving axially.

Description

The camera lens module

Technical field

The present invention relates to a kind of camera lens module, relate in particular to the built-in camera lens module of a kind of drive unit.

Background technology

When the camera of the 35mm that can focus automatically occurring when 1985, it provides a kind of method that can obtain clear pictures fast.(see also " revolution of focusing automatically " external techwatch, SCIENTIFIC ﹠amp; TECHNICAL TRENDSABROAD, 1997 08 phases) nowadays, the camera lens module with automatic focus function is applied in imaging field widely, and in order to adjust the object distance and the image distance of imaging len, especially the application in digital camera is more extensive.Described camera lens module generally comprises the lens barrel of a ccontaining lens combination, the holder of a ccontaining camera lens and the drive unit that this lens barrel of driving moves.

In having the camera lens module of automatic focus function, traditional drive unit such as step motor, operated by rotary motion needs the connection of a transmission component to move along its axis by indirect driving lens barrel in the outside of described holder.And because drive unit and transmission component thereof generally are positioned at the one-sided of lens barrel, cause the camera lens module when actual assembled, structure is asymmetric, in use, can make discontinuity around the lens barrel, thus when the driving lens barrel moves along its axis easy beat.

Summary of the invention

In view of this, be necessary to provide a kind of drive unit built-in, and the camera lens module of structural symmetry.

A kind of camera lens module, it comprises that a holder, a drive unit and are contained in the lens barrel in this holder.Described drive unit is used to drive this lens barrel and moves along its axis.Described drive unit comprises a toroidal coil stator and contains the rotor of a magnet ring at least.The outer wall of described lens barrel has external thread.Described drive unit is placed between lens barrel and the holder, and described toroidal coil stator is fixed on the inwall of this holder, and it has one and is installed with the space, and described rotor is placed in the described space that is installed with.Described drive unit also further comprises one from the extended set collar of the inner ring surface of this toroidal coil stator.The inner ring surface of described rotor and set collar is slidingly connected, and the inwall of described rotor also has the internal thread with described external thread engagement.

Compare prior art, the drive unit in the camera lens module of the present invention is arranged on the inwall of the holder of described camera lens module, need not extra transmission component and can drive lens barrel and move along its axis.And the lens barrel all directions are stressed evenly, so it is not easy to produce beat when moving axially.

Description of drawings

Fig. 1 is the schematic perspective view of camera lens module provided by the invention.

Fig. 2 is the perspective exploded view of Fig. 1.

Fig. 3 is the cut-open view along Fig. 1 III-III direction gained.

Embodiment

See also Fig. 1, Fig. 2 and Fig. 3, the camera lens module 100 that embodiment of the present invention provides, it comprises a lens barrel 10, a holder 20 and a drive unit 30.Described lens barrel 10 is contained in the described holder 20, and described drive unit 30 is placed between lens barrel 10 and the holder 20.Described lens barrel 10 is spirally connected with described drive unit 30 activities.Described drive unit 30 is used to drive this lens barrel 10 and moves axially.

Described lens barrel 10 is a hollow tube-shape thing, and the outer wall of an end of this lens barrel 10 is provided with external thread 11, and the outer wall of the other end of this lens barrel 10 is concaved with at least one limit sliding chutes 12.Described lens barrel 10 is provided with an end of limit sliding chutes 12, further comprises also that along the axial of lens barrel 10 one supplies extraneous light to enter the light hole 13 of camera lens module 100.In the present embodiment, the quantity of described limit sliding chutes 12 is three, is evenly distributed on the outer wall of described lens barrel 10.

Described holder 20 is used for fixing described lens barrel 10.Described holder 20 comprises a body 21 and a loam cake 22.Described loam cake 22 stretches out at least one flange 221 corresponding with described limit sliding chutes 12, and the number of described flange 221 is less than or equals the number of described limit sliding chutes 12.In the present embodiment, the number of described flange 221 equates with the number of described limit sliding chutes 12, also is three.Described flange 221 is housed in the limit sliding chutes 12 of described lens barrel 10, can limit the rotation of lens barrel 10.

Described drive unit 30 comprises a toroidal coil stator 31, a set collar 32 and a rotor 33.

Described toroidal coil stator 31 is fixed on the inwall of described holder 20, and it has one and is installed with space 311, and its inner ring surface has a plurality of utmost point teeth.

Described set collar 32 extends from the inner ring surface of described toroidal coil stator 31.In the present embodiment, described set collar 32 is positioned at the centre position of the inner ring surface of described toroidal coil stator 31.

What described rotor 33 was placed in described toroidal coil stator 31 is installed with space 311, it comprises the magnet ring 332 on a swivel eye 331 that is slidingly connected with the inwall of described set collar 32 and two opposite end surfaces that are fixed on described swivel eye 331, described magnet ring 332 structures are identical, and are symmetrical arranged about set collar 32.The inwall of described swivel eye 331 has the internal thread 3311 with described external thread 11 engagements.Described magnet ring 332 also further is connected on two end faces of described set collar 32 near the end face of swivel eye 331.Thereby moving axially of restriction swivel eye 331.

During work, toroidal coil stator in the described camera lens module 100 31 produces magnetic, and the magnet ring 332 in the described rotor 33 is subjected to the induction of toroidal coil stator 31 and rotates around the optical axis of described lens combination, thereby drives rotor 33 and swivel eye 331 rotations.Be appreciated that described rotor forms a sliding bearing with set collar 32, these rotor 33 relative fixed rings 32 rotations 33 this moments.Described swivel eye 331 is spirally connected with lens barrel 10 activities that seat 20 restrictions that are fixed rotatablely move, and therefore described lens barrel 10 can move axially, thereby realizes the focusing of camera lens module 100.

In addition, those skilled in the art also can do other variation in spirit of the present invention, as long as it does not depart from technique effect of the present invention, all should be included within the present invention's scope required for protection.

Claims

1. camera lens module, it comprises a holder, one drive unit and one is contained in the lens barrel in this holder, described drive unit is used to drive this lens barrel and moves along its axis, described drive unit comprises a toroidal coil stator and contains a magnet ring rotor at least, it is characterized in that, the outer wall of described lens barrel has external thread, described drive unit is placed between lens barrel and the holder, described toroidal coil stator is fixed on the inwall of this holder, it has one and is installed with the space, described rotor is placed in the described space that is installed with, described drive unit also further comprises one from the extended set collar of the inner ring surface of this toroidal coil stator, the inner ring surface of described rotor and set collar is slidingly connected, and the inwall of described rotor also has the internal thread with described external thread engagement.

2. camera lens module as claimed in claim 1, it is characterized in that, described rotor comprises two magnet rings of the symmetry on swivel eye that an inner ring surface with described set collar is slidingly connected and two end faces that are separately fixed at described swivel eye, and the inwall of described swivel eye has the internal thread with described external thread engagement.

3. camera lens module as claimed in claim 1 is characterized in that, described lens barrel is a hollow tube-shape thing, and the outer wall of an end of this lens barrel is provided with external thread, and the outer wall of the other end of this lens barrel is concaved with at least one limit sliding chutes.

4. camera lens module as claimed in claim 3, it is characterized in that, described holder stretches out at least one flange corresponding with described limit sliding chutes, and described flange is housed in the limit sliding chutes of described lens barrel and the quantity of described flange is less than or equal to the quantity of described limit sliding chutes.

5. camera lens module as claimed in claim 4 is characterized in that, the quantity of described flange equates with the quantity of described limit sliding chutes.

6. camera lens module as claimed in claim 1 is characterized in that described set collar is positioned at the centre position of toroidal coil stator inner ring surface.

7. camera lens module as claimed in claim 2 is characterized in that, described two magnet rings are connected to respectively on two end faces of described set collar near the end face of swivel eye.