Electrostatic latent image forming apparatus using semiconductor

Details Electrostatic latent image forming apparatus using semiconductor Electrostatic latent image forming apparatus using semiconductor

1987-02-11

1988-03-01

Prescott, A. C.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3R, 355 8, 346 76L, 3461531, G03G 1500

Patent

active

047289899

ABSTRACT:
An electrostatic latent image forming apparatus using a semiconductor laser 11 forms an image on a surface of a photoreceptor drum 15 by a laser beam modulated by an image signal while intensity of the laser beam is lowered by a reflection mirror 16 having a reflectance as low as 30%. The semiconductor laser 11 is driven by current obtained by adding bias current Iba to switching current Isw and a bias component out of an optical output level thereof is decreased by the reflection mirror 16 having the low reflectance. Therefore, an off-level optical output correponding to the bias current becomes lower than that in the case in which lowering of the intensity of the beam is not caused, and as a result, a "fogging" phenomenon or the like can be effectively prevented.

REFERENCES:
patent: 4552449 (1985-11-01), Wakamatsu et al.
patent: 4563081 (1986-01-01), Sato
patent: 4578689 (1986-03-01), Spencer et al.
patent: 4589764 (1986-05-01), Tadokoro et al.
patent: 4641200 (1987-02-01), Shoji et al.

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