Driving control device, portable optical apparatus and...

Details Driving control device, portable optical apparatus and... Driving control device, portable optical apparatus and...

2007-10-09

2007-10-09

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

With support

C359S811000, C359S823000, C359S824000

Reexamination Certificate

active

11601688

ABSTRACT:
A driving control device20controls supply of driving pulses to expand and contract a piezoelectric element12so that an expansion rate is different from a contraction rate, to vibrate a driving rod17and move a lens21frictionally engaging with the driving rod17in two directions. The driving control device20includes an actual driving pulse number measuring unit32that measures actual driving pulse numbers, which are required to move the lens21by a predetermined movement amount in the two directions, before a focusing operation of the lens21, a correction factor calculating unit33that calculates correction factors relating to a driving pulse number, based on the actual driving pulse numbers and a predetermined reference pulse number; and a driving pulse number correcting unit34that corrects a driving pulse number supplied to the piezoelectric element12based on the correction factors.

REFERENCES:
patent: 5225941 (1993-07-01), Saito et al.
patent: 6249093 (2001-06-01), Takahata et al.
patent: 2004/0212721 (2004-10-01), Watanabe
patent: 63-157578 (1988-06-01), None
patent: 2633066 (1997-04-01), None
patent: 11-356070 (1999-12-01), None
patent: 2002-72073 (2002-03-01), None
patent: 2004-77959 (2004-03-01), None

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