| 摘要 |
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.
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