Lens module

Patent metadata

Field	Value
Publication number	US-9523837-B2
Application number	US-201514611955-A
Country	US
Kind code	B2
Filing date	Feb 2, 2015
Priority date	Mar 6, 2014
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

A lens module includes a driving device, an image sensing device, a lens group frame, and an infrared filter. The driving device has a lens barrel for an optical signal passing through. The image sensing device is on a path of the optical signal to convert the optical signal into an electric signal. The lens group frame is provided in the lens barrel, and has a main body, which is driven by the driving device to be moved between a first position and a second position, and a lens holder, which is pivotally connected on the main body and is swung between a third position and a fourth position when the main body is respectively at the first and the second positions. The infrared filter is provided on the lens holder, and is precisely aligned with the image sensing device when the lens holder is at the fourth position.

First claim

What is claimed is:

1. A lens module, comprising:
a driving device having at least one lens barrel which allows an optical signal to pass through;
an image sensing device provided on a side of the driving device, wherein the image sensing device is on a path of the optical signal to convert the optical signal into an electric signal accordingly;
a lens group frame provided in the lens barrel, wherein the lens group frame has a main body, which is driven by the driving device to be moved between a first position and a second position, and a lens holder pivotally connected to the main body; the lens holder is moved between a third position and a fourth position as the main body is moved between the first position and the-second position; and
an infrared filter provided on the lens holder, wherein when the lens holder is at the fourth position, the infrared filter is precisely located on the path of the optical signal to filter out infrared rays within the optical signal which is projected to the image sensing device.

2. The lens module of claim 1 , wherein the lens group frame further has a torsion spring, which has opposite ends urging the main body and the lens holder respectively to provide a force to urge the lens holder from the third position to the fourth position in a curved path.

3. The lens module of claim 1 , wherein the driving device further has a rod; the lens group frame has a gear set provided at where the lens holder pivotally connected to the main body; when the main body of the lens group frame is moved to the first position from the second position, the rod abuts against the gear set to rotate the gear set to swing the lens holder from the fourth position back to the third position.

4. The lens module of claim 3 , wherein when the main body of the lens group frame is at the first position, the rod keeps abutting against the gear set to restrict the lens holder from leaving the third position.

5. The lens module of claim 1 further comprising at least one lens provided on the lens holder; when the lens holder is at the fourth position, the at least one lens is precisely located on the path of the optical signal, and the infrared filter is between the at least one lens and the image sensing device.

6. The lens module of claim 1 , further comprising at least one lens provided on the lens holder; when the lens holder is at the fourth position, the at least one lens is precisely aligned with the image sensing device, and the at least one lens is between the infrared filter and the image sensing device.

7. The lens module of claim 1 , wherein the main body of the lens group frame has an opening which is precisely aligned with the image sensing device; when the lens holder is at the third position, the infrared filter is deviated from the opening, and when the lens holder is at the fourth position, the infrared filter is precisely aligned with the opening.

8. The lens module of claim 1 , further comprising a plurality of lenses provided on the lens holder, and the infrared filter is between two of the lenses; when the lens holder is at the fourth position, the lenses are precisely aligned with the image sensing device.

9. The lens module of claim 1 , wherein the driving device includes a first lens barrel, a second lens barrel, a third lens barrel, a fourth lens barrel, and a fifth lens barrel which allow the optical signal to pass through; the second lens barrel is provided in the first lens barrel, and can be driven by a motor to reciprocate in the first lens barrel; the third lens barrel is provided in the first lens barrel with a part thereof in the second lens barrel; the fourth lens barrel is provided in the second lens barrel to be located between the second lens barrel and the third lens barrel, and is movable relative to the second lens barrel; the fifth lens barrel is provided in the fourth lens barrel; the lens group frame is provided in the fourth lens barrel, and can be moved back and forth between a first position and a second position in the fourth lens barrel.

10. The lens module of claim 9 , wherein the first lens barrel has a rail on an inner side thereof, and the second lens barrel has a bump on an outer side thereof to be engaged with the rail of the first lens barrel; the bump can be driven by the motor to reciprocate in the rail, which makes the second lens barrel reciprocate in the first lens barrel.

11. The lens module of claim 9 , wherein the second lens barrel has a can groove on an inner side thereof; the fourth lens has a guide shaft on an outer side thereof to be received in the can groove of the second lens barrel; which makes the fourth lens barrel relative movable to the second lens barrel along the cam groove.

12. The lens module of claim 9 , wherein the third lens barrel has a first straight slot on a wall thereof, and the fourth lens barrel has a first guide slot on a wall thereof to correspond to the first straight slot of the third lens barrel; the main body has a protrusion shaft on an outer side thereof to pass through the first guide slot of the fourth lens barrel and to be received in the first straight slot of the third lens barrel, which makes the main body movable back and forth in the fourth lens barrel along the first straight slot and the first guide slot.

13. The lens module of claim 9 , wherein the third lens module has a second straight slot on the wall thereof, and the fourth lens barrel has a second guide slot on the wall thereof to correspond to the second straight slot of the third lens barrel; the fifth lens barrel has a shaft on an outer side of the fifth lens barrel thereof to pass through the second guide slot of the fourth lens barrel and to be received in the second straight slot of the third lens barrel, which makes the fifth lens barrel movable back and forth in the fourth lens barrel along the second straight slot and the second guide slot.

Assignees

• Sintai Optical Shenzhen Co Ltd
• Asia Optical Int Ltd

Inventors

• Hwang Duen-Kwei
• Chang Ming-Chih

Classifications

• G02B7/04

  with mechanism for focusing or varying magnification · CPC title

• G03B7/10

  a servo-motor providing energy to move the setting member · CPC title

• G02B7/006

  Filter holders · CPC title

• G02B7/102 Primary

  controlled by a microcomputer (cameras with interchangeable lenses G03B17/14) · CPC title