Diaphragm control apparatus of interchangeable lens camera

Details Diaphragm control apparatus of interchangeable lens camera Diaphragm control apparatus of interchangeable lens camera

2011-07-05

2011-07-05

Fuller, Rodney E (Department: 2862)

Photography

Exposure control circuit

Diaphragm function only

C396S508000

Reexamination Certificate

active

07974530

ABSTRACT:
A diaphragm control apparatus is provided in a camera body, in which a controller drives a stepping motor to move the slider away from an origin position, thereafter drives the stepping motor in the opposite direction toward the origin position, and thereafter detects the slider position after holding the stepping motor for a first waiting time upon a distance from the slider to the origin position becoming less than slider-moving distance for one step of the stepping motor. The controller causes the stepping motor to enter a free state upon a lapse of the first waiting time and detects the slider position upon a lapse of a second waiting time to set an initial excitation pattern from a difference between the slider position detected during the first waiting time and the slider position detected in the free state thereof and from the moving distance of the slider.

REFERENCES:
patent: 5768639 (1998-06-01), Ogasawara
patent: 2007/0196083 (2007-08-01), Yamamoto et al.
patent: 2008/0170845 (2008-07-01), Kurosawa
patent: 2008/0199176 (2008-08-01), Kurosawa
patent: 2009/0263120 (2009-10-01), Kurosawa
patent: 2010/0220990 (2010-09-01), Tsujiyama
patent: 2010/0329658 (2010-12-01), Yamada et al.
patent: 2010/0329665 (2010-12-01), Yamada et al.
patent: 2008-197552 (2008-08-01), None
U.S. Appl. No. 12/822,451 to Toshiaki Yamada et al., which was filed on Jun. 24, 2010.
U.S. Appl. No. 12/822,489 to Toshiaki Yamada et al., which was filed on Jun. 24, 2010.

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