Electrophotographic image forming apparatus and method

Details Electrophotographic image forming apparatus and method Electrophotographic image forming apparatus and method

1991-05-10

1993-10-05

Reinhart, Mark J.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

358298, H04N 121

Patent

active

052509591

ABSTRACT:
An electrophotographic image forming apparatus includes a photosensitive member, a charger for charging the photosensitive member with a given initial potential, a laser diode for forming an electrostatic latent image by applying light to the photosensitive member charged with the initial potential, a laser driver for controlling the amount of light to be applied to the photosensitive member from the laser diode in compliance with an image density signal indicative of the density of each pixel of an image to be formed, and at least one developing device accommodating a developer consisting of toner and carrier. The electrostatic latent image formed on the photosensitive member is developed by the developer contained in the developing device. The image forming apparatus further includes a toner density detector for detecting the toner density in the developer, a memory for storing a plurality of gradation correction data, and a CPU for selecting one of the plurality of gradation correction data stored in the memory based upon a toner density detected by the toner density detector. The CPU makes the laser driver control the amount of light based upon gradation correction data selected by the CPU.

REFERENCES:
patent: 4277162 (1981-07-01), Kasahara et al.
patent: 4801980 (1989-01-01), Arai et al.
patent: 4873428 (1989-10-01), Takeuchi et al.
patent: 4914459 (1990-04-01), Mama et al.

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