Image forming apparatus having image density gradation correctio

Details Image forming apparatus having image density gradation correctio Image forming apparatus having image density gradation correctio

1995-08-21

1996-11-12

Grimley, Arthur T.

Electrophotography

Control of electrophotography process

Control of developing

358458, 358519, 358521, G03G 1500

Patent

active

055745440

ABSTRACT:
An image forming apparatus includes an image carrier on which a plurality of latent patch images are formed by exposure of different luminance, and the latent patch images are developed to form toner patch images. The apparatus further includes a gradation correction curve forming device in which a gradation correction curve is made from reflection density data of the patch toner image. The correction curve is formed, and gradation correction processing is conducted in accordance with the correction curve, so that an image forming process can be carried out. Further, when the correction curve cannot be obtained, at least one predetermined gradation curve stored in a memory in advance is selected as a substitution for the correction curve.

REFERENCES:
patent: 4792979 (1988-12-01), Nomura et al.
patent: 5258783 (1993-11-01), Sasanuma et al.

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