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:
Aug. 21, 1979
Filed:
Jun. 15, 1977
Siegfried Barbieri, Brixen, IT;
Durst AG. Fabrik Fototechnischer Apparate, Bozen, IT;
Abstract
The color composition of printing light in a photographic enlarger is sampled by rotating a sampling duct between the original image holder and the objective lens. The duct has a thin elongated rectangular shape with a light diffusing aperture disposable in the printing light and with mirrored inside walls, which transmit a representative sample of the printing light to the outlet aperture, which is disposed in front of light measuring receivers. The receivers generate a signal which is processed to govern the insertion of filters in the light-mixing head of the enlarger to provide the desired color composition in the printing light. A convenient push control and actuating switch arrangement is provided to simplify insertion of the duct in the printing light before and its removal during the printing exposure.