Document scanning optical device

Details Document scanning optical device Document scanning optical device

1987-04-21

1989-02-28

Braun, Fred L.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 71, G03B 2754

Patent

active

048090433

ABSTRACT:
A document illuminating device, for use in an electrostatic copying machine or the like includes an illuminating lamp, a main reflecting device partly surrounding the illuminating lamp, and a subsidiary reflecting device disposed opposite to the illuminating lamp and the main reflecting device. The difference between a first quantity (L.sub.1) of light illuminating a document via a first illuminating light path ranging from one side to the document without reflection by the subsidiary reflecting device and a second quantity (L.sub.2) of light illuminating the document via a second illuminating light path ranging from the other side to the document with reflection by the subsidiary reflecting device is adjusted to not more than 15% of the sum of the first and second quantities (L.sub.1 +L.sub.2).

REFERENCES:
patent: 3982116 (1976-09-01), Sakuma
patent: 4092066 (1978-05-01), Kawai
patent: 4194835 (1980-03-01), Shiode
patent: 4239383 (1980-12-01), Peterson
patent: 4259711 (1981-03-01), Mochizuki
patent: 4295186 (1981-10-01), Sugiura et al.
patent: 4483609 (1984-11-01), Harada
patent: 4518249 (1985-05-01), Murata et al.

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