Title:
CAMERA LENS ACTUATION APPARATUS
Document Type and Number:
WIPO Patent Application WO2007113478
Kind Code:
A8
Abstract:
A camera lens actuation apparatus for driving motion of a camera lens supported on a support structure by a suspension system. The apparatus incorporates a subassembly comprising SMA wire connected to at least one mounting member which is mounted to the support structure. At least one pair of lengths of SMA wire are held in tension between the camera lens element and the support structure at respective acute angles to the optical axis applying a tensional force having a component along the optical axis. The lengths of SMA wire in the pair are held at angle as viewed along the optical axis. There may be plural pairs with a balanced arrangement in which the forces generated have no net component perpendicular to the optical axis and generate no net torque around any axis perpendicular to the optical axis. A control circuit controls heating of the SMA wire in response to a measure of its resistance.
Inventors:
TOPLISS RICHARD (GB)
LIVINGSTONE DAVID (GB)
LEEDHAM ROBERT JOHN (GB)
LIVINGSTONE DAVID (GB)
LEEDHAM ROBERT JOHN (GB)
Application Number:
PCT/GB2007/001050
Publication Date:
October 30, 2008
Filing Date:
March 23, 2007
Export Citation:
Assignee:
1 LTD (GB)
TOPLISS RICHARD (GB)
LIVINGSTONE DAVID (GB)
LEEDHAM ROBERT JOHN (GB)
TOPLISS RICHARD (GB)
LIVINGSTONE DAVID (GB)
LEEDHAM ROBERT JOHN (GB)
International Classes:
G02B7/02; F03G7/06; G02B7/08; G03B13/34
Download PDF: