Image forming apparatus having a plurality of developers and a d

Details Image forming apparatus having a plurality of developers and a d Image forming apparatus having a plurality of developers and a d

1987-08-24

1989-09-12

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355214, 355326, G03G 1500, G03G 1501

Patent

active

048664812

ABSTRACT:
An image forming apparatus including a rotatable electrostatic latent image support member, a corona charger, an exposure device, a first developing device confronting the support member and having an effective developing width for developing an electrostatic latent image formed on the support member, a second developing device confronting the support member upstream of the first developing device in a rotational direction of the support member and having an effective developing width for developing, on the support member, not only a first area not to be developed by the first developing device but a second area for forming the electrostatic latent image, a device for forming, in the first area, a reference latent image for detecting a density of the image, a detection device for detecting a density of a reference toner image obtained by developing the reference latent image by the second developing device and a control device for controlling, on the basis of a detection signal from the detection device, the density of the image formed by the second developing device.

REFERENCES:
patent: 4246867 (1981-01-01), Hudson
patent: 4277162 (1981-07-01), Kasahara et al.
patent: 4277549 (1981-07-01), Tatsumi et al.
patent: 4313671 (1982-02-01), Kuru
patent: 4607944 (1986-08-01), Rushing

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