Apparatus for controlling the quantity of light of a copying app

Details Apparatus for controlling the quantity of light of a copying app Apparatus for controlling the quantity of light of a copying app

1990-12-14

1991-10-15

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355228, G03B 2772

Patent

active

050578642

ABSTRACT:
The present invention relates to an apparatus for controlling the quantity of light of a copying apparatus, and more particularly, to an apparatus for controlling the quantity of light to uniformalize the quantity of central light and the quantity of marginal light in a variable power type copying apparatus. The apparatus for controlling the quantity of light of a variable power type copying apparatus has a douser i.e. a light interrupting plate for controlling the quantity of marginal light can be automatically inserted into the projection optical system interlocking with the variable power operation.

REFERENCES:
patent: 3334542 (1967-08-01), Wenthe et al.
patent: 3981577 (1976-09-01), Tsilibes
patent: 4072413 (1978-02-01), Amess
patent: 4080057 (1978-03-01), Nakane et al.
patent: 4090788 (1978-05-01), Massengeil
patent: 4113379 (1978-09-01), Harada et al.
patent: 4194835 (1980-03-01), Shiode
patent: 4716442 (1987-12-01), Yazaka

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