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:
Jun. 14, 1988
Filed:
Oct. 03, 1986
Applicant:
Inventor:
Syuichiro Saito, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354452 ;
Abstract
A diaphragm device having a plurality of blades defining an aperture opening whose size is varied by a stepwise drive. For the adjustment of the size to small values, the driving of the diaphragm blades is controlled in such a manner that they are first driven excessively by at least one step and then backward by the corresponding number of steps to that excess.