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:
Oct. 12, 1976
Filed:
Sep. 23, 1975
Applicant:
Inventors:
Siegfried Barbieri, Brixen, IT;
Franz Obertegger, Meran, IT;
Assignee:
Durst AG Fabrik Fototechnischer Apparate, Bozen, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01J / ; G01B / ;
U.S. Cl.
CPC ...
356175 ; 355 38 ; 356178 ;
Abstract
A color filter-determining apparatus, which indicates the color component to be balanced, has two measuring circuits, each of which contains a pair of photoelectric transducers. One of the photoelectric transducers in each measuring circuit is sensitive to the same primary color and the other transducers are sensitive to different primary colors. The measuring circuits comprise resistance measuring bridges, which are complemented by resistors and diagonally supplied by separate power sources and also diagonally connected to inputs of operational amplifiers, such as sum-and-difference amplifiers.