Patent
Pulse width modulator
Seishi Kaneiwa,Junichi Kimizuka +1 more
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TLDR
In this article, the authors proposed a method to generate a natural intermediate tone picture whose center of recording dots is coincident by providing a pulse generating means comparing a code signal converted by a code conversion means with a code signals commanding a pulse width of a modulation signal and generating a pulsewidth modulation signal having a prescribed pulse width in a laser beam printer.Abstract:
PURPOSE: To generate a natural intermediate tone picture whose center of recording dots is coincident by providing a pulse generating means comparing a code signal converted by a code conversion means with a code signal commanding a pulse width of a modulation signal and generating a pulse width modulation signal having a prescribed pulse width in a laser beam printer. CONSTITUTION: A comparison result signal HH of a comparator 22 is outputted to a glitch elimination circuit 24. A pulse signal II is outputted from the glitch elimination circuit 24. A code converter 1 converts counts C(0∼7) outputted from a counter 23 into code signals B(6,4,2,0,1,3,5,7). Thus, while the timewise center phase of the width of the pulse width modulation signal II is kept nearly constant, the output data A is changed with respect to the input data D(O-7). The center of phase is deviated slightly in comparison with an ideal pulse width, but when the input data D is a 6-bit signal to express, e.g., 64-gradation, the center of the pulse width modulation signal II approaches limitlessly the ideal form. COPYRIGHT: (C)1987,JPO&Japioread more
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Patent
Picture image binary-coding method
TL;DR: In this article, a threshold pattern stored in the matrix memory MXM has an increase in pulse width almost from the center to the left and right circumferences by turns, and it has no Y-directional linearity along the edge of picture elements, and unnaturalness due to variation of line width is improved.