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Image forming system using digital ASIC and analog ASIC for processing image data and controlling semiconductor laser, and half-tone pixel representing method

  • US 5,784,091 A
  • Filed: 05/23/1997
  • Issued: 07/21/1998
  • Est. Priority Date: 06/04/1993
  • Status: Expired due to Term
First Claim
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1. An image forming system for forming an image comprising respective pixels, comprising:

  • a semiconductor laser for emitting light as a light output;

    a digital ASIC responsive to pixel data representing said respective pixels and comprising a pulse width modulator which modulates a pulse width and generates a pulse width modulation output signal in accordance with said pixel data; and

    an analog ASIC responsive to said pulse width modulation output signal of said digital ASIC and comprising a power modulator which modulates a pulse amplitude so as to generate a modulated laser control signal for said semiconductor laser;

    wherein the pulse width modulation output signal of said digital ASIC and the laser control signal of said analog ASIC control said semiconductor laser so as to pulse-width-modulate and amplitude-modulate the light emitted by said semiconductor laser that may be pulse-width-modulated and amplitude-modulated.

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