Exposure time control

Details Exposure time control Exposure time control

1977-11-04

1979-02-20

Hix, L. T.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 68, 355 77, G03B 2778

Patent

active

041403916

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.

REFERENCES:
patent: 3504971 (1970-04-01), McCune
patent: 3992098 (1976-11-01), Wirtz

Affiliated with

Also associated with

Rating

Exposure time control does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Exposure time control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exposure time control will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-255958