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:
Oct. 05, 1976
Filed:
May. 14, 1974
Kazuhiro Akiyama, Omiya, JA;
Shinichiro Fujino, Urawa, JA;
Fuji Photo Optical Co., Ltd., Omiya, JA;
Abstract
The start of the leading curtain or the trailing curtain of a focal plane shutter is controlled to obtain an accurate exposure time. A delay means is provided in the mechanism for releasing the leading curtain or in the mechanism for releasing the trailing curtain. The difference between the delay time of the start of the leading curtain and the delay time of the start of the trailing curtain is controlled to be equal to the constant time during which the leading curtain runs overlapping with the trailing curtain. In one embodiment, an inertia member is provided in the vicinity of the curtain release member to delay the movement of the curtain release member. In another embodiment, an electric delay circuit is provided to delay the start of the trailing curtain. In both embodiments, the time of delay of the start of the curtain can be controlled.