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:
Sep. 14, 1999
Filed:
Apr. 06, 1995
Masami Sugimori, Kanagawa-ken, JP;
Futoshi Kai, Kanagawa-ken, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical apparatus includes a light quantity adjusting member arranged to vary a quantity of light when the member is moved, a stepping motor arranged to drive the light quantity adjusting member, a luminance detecting part for detecting the luminance of a shooting object on the basis of the quantity of light obtained through the light quantity adjusting member, and a control circuit for driving and controlling the stepping motor in such a way as to make a difference between the luminance of the object detected by the luminance detecting part and a target luminance value smaller, the control circuit being arranged to change the driving speed of the stepping motor to be lowered when the object luminance comes near to the target luminance value.