Printer controller for laser beam printer
AssigneeHitachi, Ltd.
InventorsAkira Abe, Kikuo Hatazawa, Mitsuo Ohno
Life of this patent
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Abstract
A control system for controlling a laser beam printer in which a light-sensitive drum surface is scanned on a line base with a laser beam modulated in accordance with data to be printed. The width of scanning lines is broadened so that the adjacent scanning lines are partially superposed each other at those portions where both of the adjacent lines are to be irradiated with the laser light beam, while at those portions where at least one of the adjacent lines are not to be irradiated, the scanning line is reduced in width.
Claims4
A printer controlling system applied to a laser beam printer which incorporates a laser, scanning means for scanning a light-sensitive member with a laser beam on a line base, comprising:
- first means for supplying pattern data to be printed for every scanning line, the pattern data for each of said scanning lines being constituted by a serial train containing serially first type binary digits which command irradiation with the laser beam and second type binary digits which command non-irradiation by said laser beam;
- second means for effecting the scanning on the line base in such a width that the scanning lines adjacent to each other are superposed on each other;
- third means for effecting said scanning in a line width which is narrower than that effected by said second means;
- and
- fourth means for receiving the pattern data from said first means to respond to said first type binary digit to thereby select said second means when both digits of scanning lines which precedes and succeeds, respectively, to the scanning line corresponding to said received pattern data are said first type digit at same digit positions, while selecting said third means when at least one of said both digits is said second type binary digit.
Dependencies are inferred from the claim text.