Shape memory alloy actuation apparatus

Details Shape memory alloy actuation apparatus Shape memory alloy actuation apparatus

2011-07-05

2011-07-05

Hasan, Mohammed (Department: 2873)

Optical: systems and elements

Lens

With support

C359S824000, C359S820000

Reexamination Certificate

active

07974025

ABSTRACT:
A miniature camera lens actuation apparatus employs an SMA actuator comprising SMA wire to move a camera lens element. To provide autofocus, the SMA actuator is heated across its range of contraction and the resistance at which the focus is at an acceptable level is stored. To combat hysteresis, there is performed a flyback in which the SMA actuator is cooled, before heating the SMA actuator to the stored resistance. The stored resistance is adjusted to combat creep caused by non-linear heating of the SMA actuator. The SMA wire has conductive material extending along on a portion of the SMA wire which extends from a member connected to the SMA wire and being in electrical connection with the SMA wire in order to short out that portion of the SMA wire to reduce creep. Additional material is applied over the SMA wire and the member to reduce fatigue.

REFERENCES:
patent: 4490976 (1985-01-01), Johnson
patent: 4977886 (1990-12-01), Takehana et al.
patent: 5459544 (1995-10-01), Emura
patent: 6307678 (2001-10-01), Kosaka et al.
patent: 6434333 (2002-08-01), Tanaka et al.
patent: 6516146 (2003-02-01), Kosaka
patent: 6574958 (2003-06-01), MacGregor
patent: 7295389 (2007-11-01), Ohtsuka et al.
patent: 2001/0002226 (2001-05-01), Tanaka et al.
patent: 2001/0025477 (2001-10-01), Hara et al.
patent: 2006/0048511 (2006-03-01), Everson et al.
patent: 2006/0109570 (2006-05-01), Ohtsuka et al.
patent: 2006/0150627 (2006-07-01), Oohara
patent: 2006/0209195 (2006-09-01), Goto
patent: 2006/0272328 (2006-12-01), Hara et al.
patent: 2007/0034818 (2007-02-01), Grummon
patent: 2008/0278030 (2008-11-01), Hara et al.
patent: 2008/0278590 (2008-11-01), Tanimura et al.
patent: 2008/0282696 (2008-11-01), Wada et al.
patent: 1 914 422 (2008-04-01), None
patent: 09-127398 (1997-05-01), None
patent: 2002-130114 (2002-05-01), None
patent: 2002/250272 (2002-09-01), None
patent: 2004-38058 (2004-02-01), None
patent: 2005-275270 (2005-10-01), None
patent: 2005/297437 (2005-10-01), None
patent: 2007-315352 (2007-12-01), None
patent: WO 94/19051 (1994-09-01), None
patent: WO 01/47041 (2001-06-01), None
patent: WO 02/103451 (2002-12-01), None
patent: WO 2004/113723 (2004-12-01), None
patent: WO 2005/026539 (2005-03-01), None
patent: WO 2005/075823 (2005-08-01), None
patent: WO 2005/093510 (2005-10-01), None
patent: WO 2006/105588 (2006-10-01), None
patent: WO 2007/018086 (2007-02-01), None
patent: WO 2007/113478 (2007-10-01), None
U.S. Appl. No. 12/295,382, filed Sep. 30, 2008.
U.S. Appl. No. 12/525,906, filed Nov. 13, 2009.

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