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. 29, 1987
Filed:
May. 06, 1985
Applicant:
Inventors:
Masuo Ogihara, Yotsukaido, JP;
Hajime Oda, Yotsukaido, JP;
Yoichi Seki, Yotsukaido, JP;
Hiroshi Yamazaki, Yotsukaido, JP;
Assignee:
Seikosha Co., Ltd., Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354439 ; 354452 ;
Abstract
In a program shutter having a sector which is opened and closed by a step motor, there is provided a home position detection means for detecting whether or not the sector is positioned in a home position. Before and after an exposure operation, it is detected whether or not the sector is positioned in the home position, and if the sector is not positioned in the home position, the step motor is reversely rotated to complete the closing movement of the sector.