Exposure value control system for copying machines

Details Exposure value control system for copying machines Exposure value control system for copying machines

1981-08-19

1984-04-17

Gellner, Michael L.

Photocopying

Projection printing and copying cameras

Illumination systems or details

G03B 2772

Patent

active

044430973

ABSTRACT:
An exposure value control system for a copying machine of the narrow slit exposure type in which a fluorescent lamp and a fiber lens array are used as a source of light and an imaging optical system, respectively. This exposure value control system comprises a lighting device for the fluorescent lamp, a manually-adjustable D-C voltage generator, and control means for electrically controlling a lamp current supplied from the lighting device to the fluorescent lamp in dependence upon the D-C voltage from the generator.

REFERENCES:
patent: 3599037 (1971-08-01), Grace
patent: 4124294 (1978-11-01), Nakamura
patent: 4246517 (1981-01-01), Dakroub
patent: 4290692 (1981-09-01), Sucitek
patent: 4299451 (1981-11-01), Task et al.

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