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. 05, 1989
Filed:
Dec. 14, 1987
Applicant:
Inventors:
Nobuo Shinozaki, Yotsukaido, JP;
Shigeru Tagami, Yotsukaido, JP;
Masaki Tanaka, Yotsukaido, JP;
Katauhito Niwa, Yotsukaido, JP;
Assignee:
Seikosha Co., Ltd., Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354439 ; 354452 ;
Abstract
There is disclosed a program shutter for use in a camera. The program shutter consists of a shutter mechanism and a control portion. The shutter mechanism has sectors for defining an opening and a stepper motor for driving the sectors. The control portion produces pulses having pulse width conforming to the operating characteristic of the shutter mechanism. These pulses are used to step the motor forward or backward according to the exposure corresponding to the luminance of the subject.