The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 05, 2011
Filed:
Jun. 24, 2010
Toshiaki Yamada, Saitama, JP;
Shinichiro Sanada, Tokyo, JP;
Kosei Kosako, Tokyo, JP;
Yutaka Ohsawa, Tokyo, JP;
Hirotaka Ueno, Saitama, JP;
Toshiaki Yamada, Saitama, JP;
Shinichiro Sanada, Tokyo, JP;
Kosei Kosako, Tokyo, JP;
Yutaka Ohsawa, Tokyo, JP;
Hirotaka Ueno, Saitama, JP;
Hoya Corporation, Tokyo, JP;
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.