Image read-out apparatus employing a photomultiplier

Details Image read-out apparatus employing a photomultiplier Image read-out apparatus employing a photomultiplier

1985-06-05

1989-04-04

Howell, Janice A.

Radiant energy

Invisible radiation responsive nonelectric signalling

Luminescent device

2503272, G01T 1115

Patent

active

048188760

ABSTRACT:
An image read-out apparatus for exposing a recording medium carrying an image stored therein to a light beam, and photoelectrically detecting light carrying the image information obtained from the recording medium by use of a photomultiplier comprises a comparator for comparing an output current signal of the photomultiplier with a predetermined reference value, and a voltage detector for detecting the voltage generated at a bleeder resistor of the photomultiplier. The apparatus also comprises a selection circuit for receiving the output current signal of the photomultiplier, a voltage signal detected by the voltage detector, and an output of the comparator, selecting the output current signal of the photomultiplier when the output current signal of the photomultiplier is equal to or lower than the reference value, and selecting the voltage signal when the output current signal of the photomultiplier is higher than the reference value.

REFERENCES:
patent: 4125330 (1978-11-01), Schild
patent: 4258264 (1981-03-01), Kotera et al.
patent: 4346295 (1982-08-01), Tanaka et al.

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