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:
Dec. 04, 1984
Filed:
Nov. 23, 1983
Applicant:
Inventor:
John M Kresock, Elba, NY (US);
Assignee:
Eastman Kodak Company, Rochester, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ; G03B / ;
U.S. Cl.
CPC ...
354413 ; 354416 ; 354418 ; 3152 / ;
Abstract
Electronic flash apparatus produces a variable amount of flash illumination corresponding to pre-flash photographic conditions, i.e. subject distance, film speed, ambient light intensity, etc. Circuitry, which has a threshold adjustable in response to a pre-flash signal relating to the flash illumination required for the photographic conditions, monitors energy as it is delivered to a flash tube to produce flash illumination, for activating quenching circuitry to limit the discharging of a flash capacitor to an amount of energy corresponding to the pre-flash signal.