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Battery-powered light source device for endoscope

  • US 7,772,786 B2
  • Filed: 12/01/2000
  • Issued: 08/10/2010
  • Est. Priority Date: 12/02/1999
  • Status: Active Grant
First Claim
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1. A battery-powered light source device for an endoscope, comprising a DC/DC converter having:

  • a comparator for comparing an output voltage supplied to a light source lamp with a specific reference voltage; and

    an adjuster circuit for adjusting the output voltage supplied to the light source lamp on a basis of the comparison result of the comparator so that a specific lamp voltage will be achieved;

    whereinsaid DC/DC converter raises or lowers a power supply voltage of an internal battery and supplies the raised or lowered power supply voltage to the light source lamp that generates illuminating light supplied to the endoscope, on a basis of the output signal of the adjuster circuit, wherein the adjuster circuit is equipped with an oscillator that generates a reference clock signal, and a modulator modulates the pulse width by being set by the reference clock signal of the oscillator and being reset by the comparison result of the comparator.

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