Image forming apparatus with improved patch image formation

Details Image forming apparatus with improved patch image formation Image forming apparatus with improved patch image formation

1991-06-21

1992-06-30

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355233, 355243, 355246, G03G 2100

Patent

active

051267918

ABSTRACT:
An image forming apparatus in which when a brake sensor detects a holding frame of exposure light source which moves in the backward direction, the movement of exposure light source is braked and reversed in the forward direction so that a density reference plate and a document are exposed by the exposure light source and patch image obtained by the exposure of the density reference plate is utilized for controlling the toner density. The duration of braking time which is started by turn-on of the brake sensor is previously set in accordance with the magnification of reproduction. The duration of braking time is increased as the magnification of reproduction is set greater.

REFERENCES:
patent: 4839698 (1989-06-01), Inuzuka et al.
patent: 5021822 (1991-06-01), Morikawa

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