×

Light source device

  • US 8,182,115 B2
  • Filed: 08/14/2009
  • Issued: 05/22/2012
  • Est. Priority Date: 10/02/2008
  • Status: Active Grant
First Claim
Patent Images

1. A light source device comprising:

  • a white LED that emits white light having an emission peak in a blue range; and

    an optical filter that partially reduces the quantity of light in the blue range in the white light emitted from the white LED,wherein the optical filter has spectral transmission characteristics in which transmittance is equal to or greater than 5% and equal to or less than 20% in the wavelength range of equal to or greater than 435 nm and equal to or less than 465 nm and is equal to or greater than 80% in the wavelength range of equal to or less than 405 nm and equal to or greater than 490 nm, in the wavelength range of a light source used.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×