Illumination control system utilizing an integrating feedback de

Details Illumination control system utilizing an integrating feedback de Illumination control system utilizing an integrating feedback de

1983-06-24

1985-11-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250227, G01J 132

Patent

active

045556210

ABSTRACT:
An illumination detector is positioned adjacent one surface of a wedge-shaped light pipe which is optically coupled to a mirror in a scanning system. The light coupled into the light pipe is representative of the illumination reflected from a document scanning plane, yet is totally internally reflected from the angled surface of the light pipe to produce a uniform, integrated illumination level at the photosensor. This photosensor output represents an exposure level used to adjust the output of a document illumination power supply.

REFERENCES:
patent: 3679306 (1972-07-01), DuBois et al.
patent: 3949226 (1976-04-01), Dugan et al.
patent: 4024428 (1977-05-01), Bachur et al.
patent: 4095890 (1978-06-01), van Herten
patent: 4124294 (1978-11-01), Nakamura
patent: 4255046 (1981-03-01), Corona
patent: 4406530 (1983-09-01), Hasegawa et al.

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