Image forming apparatus and erasure illumination device therefor

Details Image forming apparatus and erasure illumination device therefor Image forming apparatus and erasure illumination device therefor

1986-01-28

1988-03-29

Grimley, Arthur T.

Photocopying

Including fiber optics

355 7, 355 14E, 346107R, G03G 1500, G03G 1504

Patent

active

047347341

ABSTRACT:
An image forming apparatus includes a movable image bearing member; a charger for electrically charging the image bearing member; developing device for developing an electrostatic latent image formed on the image bearing member; illumination device disposed between the charger and the developing device, for illuminating the image bearing member to remove the electric charge from the image bearing member to prevent deposition of a developer by the developing device in an area exposed to the illumination thereof, the illumination device including a plurality of LED elements arranged substantially along a line extending in a direction crossing with a direction of movement of the image bearing member and light blocking element provided correspondingly to each of the LED elements and having substantially rectangular apertures each of which allows light from the associated LED element to pass to the image bearing member to illuminate it with a substantially rectangular illumination area; and controller for controlling actuation of each of the LED elements. Thus, a non-image area can be changed, and the boundary between the non-image area and an adjacent image area is sharp because the illumination area provided is in a rectangular form.

REFERENCES:
patent: 4255042 (1981-03-01), Armitage, Jr. et al.
patent: 4272183 (1981-09-01), Maese et al.
patent: 4344691 (1982-08-01), Grant et al.
patent: 4435064 (1984-03-01), Tsukada et al.
patent: 4490032 (1984-12-01), Conly et al.
patent: 4552447 (1985-11-01), Sagara et al.
patent: 4576464 (1986-03-01), Sakata et al.
patent: 4582417 (1986-04-01), Yagasaki et al.
patent: 4585330 (1986-04-01), Yamamoto et al.
patent: 4590492 (1986-05-01), Meier

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