A lighting control device in manuscript reproduction equipment

Details A lighting control device in manuscript reproduction equipment A lighting control device in manuscript reproduction equipment

1985-01-30

1987-08-18

Laroche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

315151, G01J 132

Patent

active

046879196

ABSTRACT:
A lighting intensity control device that controls light intensity in a manuscript reproduction apparatus includes a back plate which has a manuscript area on which a manuscript can be disposed and a monitor area outside the manuscript area; a source of light which illuminates the manuscript and the monitor area of the back plate; a photodetector arranged so as to detect the brightness of the light reflected by the manuscript and by the monitor area of the back plate; and a light control element which controls the lighting time of the source of light during each scan period so as to keep the brightness of the light reflected by the monitor area of the back plate within a predetermined range.

REFERENCES:
patent: 4555621 (1985-11-01), Buchar

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