Image forming apparatus for synthesizing a differential peak sig

Details Image forming apparatus for synthesizing a differential peak sig Image forming apparatus for synthesizing a differential peak sig

1994-01-26

1997-05-27

Barlow, Jr., John E.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347131, 347133, 347239, 347255, 347253, B41J 2385, B41J 247, B41J 239, G03G 1304

Patent

active

056336691

ABSTRACT:
In a digital image forming apparatus, the intensity or the pulse width of laser beam exposure is modulated according to image signals of a document detected by a sensor. A peak waveform having a peak is generated in each light-emitting period of laser beam. For example, and a signal having a peak is synthesized with the image signals to generate the peak waveform. Thus, the laser is driven according to the peak waveforms so that the exposed portions on a photoconductor in correspondence to the peaks are exposed with a larger quantity of light at low densities. Then, the amount of the gamma correction can be decreased and the gradation characteristic can be stabilized.

REFERENCES:
patent: 5115259 (1992-05-01), Itoh
patent: 5128699 (1992-07-01), Nakajima et al.
patent: 5189441 (1993-02-01), Fukui et al.
patent: 5255014 (1993-10-01), Haneda et al.

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