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:
Aug. 09, 1988
Filed:
Nov. 17, 1987
Applicant:
Inventor:
Akiyasu Sumi, Kanagawa, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
3542711 ; 354274 ;
Abstract
In the disclosed lens where the size of the diaphragm aperture is determined by the opening and closing movement of a plurality of blades, the movement is carried out by a stepping motor. A rotor and a stator of the motor are built into the diaphragm, and a magnet of plastic material is used as the permanent magnet for the motor rotor.