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. 30, 1986
Filed:
Apr. 02, 1984
Egbertus J Maassen, Eindhoven, NL;
Franciscus A van Meel, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A color analyzer for determining the exposure time required for printing color photographs by an enlarger comprising a measuring unit having three photoelectric cells. The analyzer is further provided with a control unit being electrically connected to the measuring unit and having an electric circuit for determining the exposure time. According to the present invention, the characteristic values of the color components, blue, green and red are measured by a respective photoelectric cell for a test print as electric signals generated by the cells at voltages of S.sub.BO, S.sub.GO, and S.sub.RO at the associated exposure time t.sub.o. These values are stored in a memory and the exposure time t of an arbitrary picture is determined with the aid of measured signals S.sub.B, S.sub.G and S.sub.R for the components blue, green, and red. This determination is computed by way of the formula: