Apparatus for controlling an exposure

Details Apparatus for controlling an exposure Apparatus for controlling an exposure

1994-12-20

1996-09-10

Beatty, Robert

Photocopying

Contact printing

Light boxes

355 69, 355 71, G03G 2100

Patent

active

055550762

ABSTRACT:
An apparatus for controlling an exposure in an image forming apparatus includes an exposure unit which varys the illumination from an exposure light source in accordance to photoreceptor sensitivity and projects the light reflected onto a photoreceptor, and a light reducing filter adjusting a quantity of light to be projected according to the sensitivity of the photoreceptor. The neutral-density filter may be employed as the reducing filter. Preferably, this filter is movable between a first position in a path of the reflected light and a second position out of the path. The photoreceptor having a thicker photosensitive layer may be used to its long life period.

REFERENCES:
patent: 4113373 (1978-09-01), Eppe et al.
patent: 4306804 (1981-12-01), Sakamoto et al.
patent: 4348099 (1982-09-01), Fantozzi
patent: 4699494 (1987-10-01), Honda
patent: 4707122 (1987-11-01), Lama et al.
patent: 4714945 (1987-12-01), Fujiwara et al.
patent: 5134439 (1992-07-01), Zuber

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