Arrangement for detecting a state of light or brightness

Details Arrangement for detecting a state of light or brightness Arrangement for detecting a state of light or brightness

1988-05-19

1990-04-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

H01J 516

Patent

active

049183028

ABSTRACT:
A copying apparatus, a printer or the like is internally provided with a state detecting arrangement for detecting a light emitting state or the brightness of a plurality of locations in the apparatus. The state detecting arrangement includes a plurality of optical fibers having respective ends positioned at a plurality of locations to be detected so that standard levels of light to be received at the other ends of the optical fibers may be different from one another. The arrangement further includes at least one light receiving element for simultaneously receiving light emitted from the other ends of the optical fibers and at least one circuit for judging the state of each location on the basis of a detection level of the light receiving element.

REFERENCES:
patent: 4013342 (1977-03-01), Norodny
patent: 4517456 (1985-05-01), Halsall et al.
patent: 4599908 (1986-07-01), Sheridan et al.
patent: 4651074 (1987-03-01), Wise

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