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:
Jun. 17, 1980
Filed:
Aug. 16, 1978
Applicant:
Inventor:
Arthur Schneider, Braunschweig-Volkenrode, DE;
Assignee:
Rollei-Werke Franke & Heidecke, Brunswick, DE;
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
315151 ; 315159 ; 3152 / ; 354 33 ;
Abstract
A light detecting and measuring device for use with an electronic flash unit comprises a phototransistor, integrating capacitor and diodes connected in circuit to the flash unit. The diodes and capacitor are connected to the phototransistor and responsive to signals from the flash unit for enabling measurement of light by the phototransistor only while the flash unit is operating thus preventing measurement from external light sources.