LENS DISPLACEMENT MECHANISM APPLIED TO AUTOFOCUS MODULE

Title:

LENS DISPLACEMENT MECHANISM APPLIED TO AUTOFOCUS MODULE

Document Type and Number:

Japanese Patent JP2009115982

Kind Code:

A

Abstract:

To provide a simple lens displacement mechanism applied to an autofocus module.

A lens 21 set in a lens holder 23 is arranged in a lens housing 20, and the lens holder is supported to move along an optical axis X. Two ends 11 of one or more shape memory alloy cables (SMA cable) 10 are fixed on a housing, and the mid-point of an intermediate slide portion 12 thereof is hooked onto a hook member 25 provided on the outer edge of the lens holder so as to form a tension state between two corresponding ends of the intermediate slide portion and keep a position with an elastic recovery member 30 such as a spring. By energizing from both ends of the SMA cable, shape memory alloy is contracted to pull the hook member, and the lens is driven to be slidably displaced on the optical axis, thereby achieving autofocus action.

Inventors:

SHYU SAN-WOEI
HUANG CHIH-HSING
WU SHR-BIN

Application Number:

JP2007287892A

Publication Date:

May 28, 2009

Filing Date:

November 05, 2007

Export Citation:

Click for automatic bibliography generation Help

Assignee:

E PIN OPTICAL INDUSTRY CO LTD

International Classes:

G02B7/04; G02B7/09

Domestic Patent References:

JP2006303955A	2006-11-02
JP2007057581A	2007-03-08
JP2006259696A	2006-09-28

Foreign References:

WO2007113478A1

2007-10-11

Attorney, Agent or Firm:

Takao Iriko

Previous Patent: PHOTOGRAPHING DEVICE, ITS CONTROL METHOD, AND PROGRAM

Next Patent: PROJECTION DEVICE