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:
Jan. 29, 1980
Filed:
Apr. 26, 1978
Applicant:
Inventor:
Yuji Maruyama, Suita, JP;
Assignee:
West Electric Company, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ; H04B / ;
U.S. Cl.
CPC ...
315151 ; 315159 ; 3152 / ; 354 33 ; 354 / ; 354139 ; 354145 ;
Abstract
An electronic flash of the type incorporating the so-called variable guide number device or a flash duration control device for controlling the quantity of a flash of light emitted from a flash lamp. In an integrating circuit of the variable guide number device diodes are used so that their forward bias characteristics may be utilized for the accurate control of a flash duration.