Exposure indicator

Details Exposure indicator Exposure indicator

1982-09-29

1984-05-01

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 83, 250214R, G03B 2774, G01J 142

Patent

active

044457731

ABSTRACT:
An exposure indicator for photographic plate makers including a comparator having a control input, an inverting input and an output; a light emitting diode having its anode connected to the control input for developing a reverse bias signal at said control input in response to illumination from the plate maker light source whereby an output comparator signal is generated when the control input signal exceeds a reference signal at the comparator's inverting input; the output signal forward biasing the light emitting diode to its light emitting state and also fed back to the control input to maintain the light emitting diode in such emitting state; and vacuum operated switch means to provide power to the indicator circuit in response to vacuum actuation of the plate maker flexible blanket.

REFERENCES:
patent: 4111549 (1978-05-01), Cazel et al.
patent: 4286171 (1981-08-01), Hara et al.

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