Diaphragm control apparatus of interchangeable lens camera

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

2011-06-28

2011-06-28

Fuller, Rodney E (Department: 2862)

Photography

Exposure control circuit

Diaphragm function only

C396S508000

Reexamination Certificate

active

07970274

ABSTRACT:
A diaphragm control apparatus in a camera body includes a stepping motor; a lead screw thereof, wherein a slider is driven by the lead screw; a position detector; and a controller. When driving the stepping motor by a predetermined number of steps in a direction to move the slider away from an origin position, the controller detects the slider position before driving the stepping motor stepwise as the origin position via the position detector, and thereafter detects a stepping position of the slider to compare the stepping position with the origin position each time the stepping motor is driven by one step, and counts the number of steps based from the moment at which the stepping position of the slider exceeds a predetermined position in the direction to move the slider away from the origin position against the biasing force of the resilient biaser.

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: 2010/0329659 (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., filed Jun. 24, 2010.
U.S. Appl. No. 12/822,457 to Toshiaki Yamada et al., filed Jun. 24, 2010.

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