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:
Sep. 01, 1981
Filed:
Oct. 29, 1979
Applicant:
Inventor:
Ronald C Laska, Minnetonka, MN (US);
Assignee:
Pako Corporation, Minneapolis, MN (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
355 68 ; 355 77 ; 355 83 ;
Abstract
A photographic printer includes light sensors for measuring optical characteristics of photographic film to be printed. Prior to printing, the output signals of the light sensors are monitored under one or more reference condition, and calibration values based upon this monitoring are derived and stored. During normal operation of the photographic printer the sensors provide measurements of the optical characteristics of the film, and the output signals of the light sensors are calibrated based upon the stored calibration values. The exposures are then controlled as a function of the corrected output signals.