Exposure device having a movable light-attenuating filter for co

Details Exposure device having a movable light-attenuating filter for co Exposure device having a movable light-attenuating filter for co

1995-12-08

1997-09-16

Brase, Sandra L.

Electrophotography

Image formation

Exposure

355 67, 399 51, 399177, G03G 1504, G03G 1528, G03G 1530

Patent

active

056690487

ABSTRACT:
An exposure device which scans and exposes a photosensitive material at low cost and with an appropriate amount of light. In a state in which the original is moved, light adjusted by a light-adjusting filter is transmitted through a light-attenuating filter and then is illuminated onto the original. The light-attenuating filter has regions 54A1, 54A2, 54A3, . . . having a fixed transmittance and a region 54B having the same transmittance of the regions 54A1, 54A2, 54A3, . . . The light-attenuating filter is moved and a transmission region on the regions 54A1, 54A2, 54A3, . . . of light illuminated onto the original is adjusted, so that an amount of light illuminated onto the original becomes an amount of light corresponding to exposure conditions. When the amount of light corresponding to the exposure conditions is the minimum amount of light, the light-attenuating filter is moved so that light illuminated onto the original is transmitted through the region 54B. Light transmitted through the moving original is transmitted through a slit to form slit light, and the slit light is imaged onto the photosensitive material by a zoom lens.

REFERENCES:
patent: 4610538 (1986-09-01), Takenaka
patent: 5321487 (1994-06-01), Shiba et al.
patent: 5430523 (1995-07-01), Tanibata
patent: 5438389 (1995-08-01), Kito et al.
patent: 5510880 (1996-04-01), Song

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