Light emission regulation device

Details Light emission regulation device Light emission regulation device

1975-12-19

1978-11-07

Adams, Russell E.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 69, 355 83, G03B 2774, G03B 2778

Patent

active

041242947

ABSTRACT:
Light emission regulation device according to which light which is emitted from a light source and is transmitted by an optical system onto a required object or objects is detected by a light detection element which is located externally to the optical system and produces or controls an output which is proportional to light incident on the light detection element and is supplied to a control means which in response controls actuation input to the light source whereby light emission is maintained at a requisite level. The light detection element being external to the optical system, light emission regulation is unaffected by the condition of elements of the optical system or material in the optical path over which light is transmitted.

REFERENCES:
patent: 3742295 (1973-06-01), Irie
patent: 3795444 (1974-03-01), Glidden et al.
patent: 3947117 (1976-03-01), Basu et al.
patent: 3977778 (1976-08-01), Seko et al.

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