Laser printer employing modulated laser providing a uniform gray

Details Laser printer employing modulated laser providing a uniform gray Laser printer employing modulated laser providing a uniform gray

1996-03-08

1998-12-29

Sterrett, Jeffrey

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347252, 347253, B41J 247

Patent

active

058546529

ABSTRACT:
A laser printer provides a photoreceptor and a laser which produces an optical beam. A modulator is coupled to the laser and is responsive to binary data values to apply modulation signals to the laser to cause an image-wise modulation of the optical beam. Scan apparatus repetitively scans the optical beam across the photoreceptor to induce an image-wise charge state thereon. The scan apparatus causes, for one of the binary values, a variation in charge states corresponding to the one binary value across the photoreceptor. A function generator applies correction signals to the modulator to alter the optical beam in such a manner as to substantially prevent the variation of charge states. The function generator either causes a modulation of the voltage bias applied to the laser or modulates its pulse width output.

REFERENCES:
patent: 4583128 (1986-04-01), Anderson et al.
patent: 4814791 (1989-03-01), Ohara et al.
patent: 5225850 (1993-07-01), Egawa et al.

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