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:
May. 17, 1977
Filed:
May. 27, 1975
Applicant:
Inventor:
Kunio Matsumoto, Ageo, JA;
Assignee:
Copal Company Limited, Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354 33 ; 354 34 ; 354127 ; 354139 ; 354145 ; 354149 ;
Abstract
An auto-strobe flash means for cameras which comprises a variable resistor inserted in a light measuring circuit of an electronic exposure time controlling arrangement for a shutter, the resistance value being a function of the photographing distance. A main flash discharge tube is ignited when the shutter is fully opened, and a differential amplifier is provided for controlling the shutter closing time in response to the value of the variable resistor.