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:
Feb. 20, 1979
Filed:
Nov. 04, 1977
Francis M Laciak, Brooklyn Park, MN (US);
John Pone, Jr, Minneapolis, MN (US);
PAKO Corporation, Minneapolis, MN (US);
Abstract
An improved exposure time control for a photographic printer includes a digital processor such as a microprocessor. The digital processor receives input signals such as signals from large area transmission density (LATD) sensors, from density or color sensors, and from an operator control panel. Based upon the input signals, the digital processor derives a digital count and a clock control signal for each color channel. The exposure of each color channel is controlled as a function of the time required to change the corresponding digital count from its initial value to a predetermined final value. The changing of the digital count for each channel is caused by the digital processor in response to clock or interrupt signals from variable clocks controlled by the clock control signals. The rates at which the interrupt signals are generated are controlled by the clock control signals.