Image exposure device

Details Image exposure device Image exposure device

1989-12-18

1991-04-30

Hix, L. T.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 71, G03B 2752, G03B 2772

Patent

active

050122770

ABSTRACT:
A device for amending a non-uniform illuminance of an image projected on an photoconductive drum, the device comprising a first shielding member provided between a glass document table and a projecting lens for shielding a portion of a light beam from a peripheral portion of a document image partially in a reduction mode, and a second shielding member provided between the projecting lens and the photoconductive drum for shielding another portion of the light beam from a central portion of the document image partially in an enlargement mode.

REFERENCES:
patent: 4057332 (1977-11-01), Allis
patent: 4125323 (1978-11-01), Ikeda et al.
patent: 4172658 (1979-10-01), Tani et al.
patent: 4243312 (1981-01-01), Ogawa
patent: 4806989 (1989-02-01), Saito et al.

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