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:
Jul. 19, 1977
Filed:
Nov. 10, 1975
Saburo Numata, Urawa, JA;
Shinichiro Fujino, Urawa, JA;
Fuji Photo Optical Co., Ltd., Omiya, JA;
Abstract
In an electric shutter including a light measuring circuit for measuring the scene brightness and a comparator connected therewith for providing output voltage which rises from a low level to a high level when a time corresponding to the scene brightness has lapsed, a switching transistor circuit and an electromagnet for holding the trailing shutter blind are connected in parallel between the output of the comparator and the main power switch. When the power switch is turned on, both the switching transistor circuit and the electromagnet are turned on. When the output voltage of the comparator rises up to the high level, the switching transistor circuit and the electromagnet are turned off.