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. 30, 1990
Filed:
Aug. 19, 1988
Yoshio Serikawa, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An auto-flash photographing system includes a flash lamp unit, a photometry unit for detecting light reflecting from a subject of interest, a reference setting unit, a comparator, and a trigger unit. The flash lamp is once triggered to emit a flash, and the light detected by the photometry unit is compared with a reference value defined by the reference setting unit by the comparator. If the detected light is lower than the reference value, it indicates underexposure so that the trigger unit once again triggers the flash lamp. In this manner, the flash lamp is fired more than once while a shutter is set in a fully open condition until an optimal exposure condition is attained. In another structure, a plurality of flash lamps are provided they may be fired at the same time and extinguished separately or they may be fired one after another in sequence until a desired exposure condition for phototaking is obtained.