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Light source device for endoscopes

  • US 5,993,037 A
  • Filed: 08/31/1998
  • Issued: 11/30/1999
  • Est. Priority Date: 08/02/1994
  • Status: Expired due to Term
First Claim
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1. A light source device for endoscopes, comprising:

  • an illumination light source;

    a light guide;

    a condenser lens constructed and arranged to concentrate light that is emitted from said illumination light source at an entrance end of said light guide; and

    at least two transmissive wavelength selecting filters arranged between said illumination light source and the entrance end of said light guide,wherein a filter of said at least two transmissive selecting filters that is situated closer to said illumination light source transmits an amount of electromagnetic energy from said illumination light source that satisfies ##EQU2## where R(λ

    ) is a spectral energy emissivity of light with a wavelength λ

    that is emitted from said illumination light source, T(λ

    ) is a spectral transmittance of the transmissive wavelength selecting filter disposed closer to said illumination light source for the wavelength λ

    , and P is a consumption power of a lamp used in said illumination light source, and where the integration with respect to the wavelength λ

    is calculated over a wavelength range greater than or equal to 750 nm.

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