Electrophotographic image forming apparatus comprising means for

Details Electrophotographic image forming apparatus comprising means for Electrophotographic image forming apparatus comprising means for

1991-11-27

1995-09-26

Wong, Peter S.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347131, 347132, 347246, 347251, 347253, 358298, G01D 1514, H04N 121

Patent

active

054537738

ABSTRACT:
In an electrophotographic image forming apparatus including a charger for electrically charging the photoconductor to a predetermined initial electric potential, a laser projects a light onto the photoconductor so as to form an electrostatic latent image thereon, and a developing device develops the latent image with toner so as to form a toner image thereon. Further, a charger controller controls the charger based on a detection result of a detector for detecting a state of the photoconductor so that the initial electric potential of the photoconductor changes in a predetermined range, and a selection controller selects one of the plurality of gradation correction data stored in a storage unit based on the detection result of the detector when the initial electric potential of the photoconductor is an upper or lower limit value of the predetermined range. Moreover, a light projecting controller controls the laser to change a light amount of the light projected, based on the gradation correction data selected by the selection controller, according to an image density signal for representing densities of respective pixels of an image to be formed.

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