Patent ID: 6217184
Filing Date: 2001-04-17
Classification: G02B

Abstract:
A light source device comprising a scattering guide provided with scattering ability inside, a light supplier to supply light to an end face portion of said scattering guide, the scattering guide light inside and providing emission from an emission face, whereinsaid emission face includes at least a part of a side portion of said scattering guide;said light supplier supplies visible light including rays in a long wavelength region and in a short wavelength region; andsaid scattering ability of the scattering guide is balance-adjusted for a relation between {Q(R)}, scattering efficiency in the long wavelength region, and {Q(B)}, scattering efficiency in the short wavelength region, so that positions near the end face portion and positions far from the end face portion are approximately equal in color temperature of emission from said emission face;said relation between {Q(R)} and {Q(B)} being expressed by {Q(B)}/{Q(R)}=(k), where (k) is an adjusting ratio for balance-adjusting and falls within a range 0.75.ltoreq.k.ltoreq.1.25, where {Q(B)} is scattering efficiency of blue light representing the short wavelength region and {Q(R)} is scattering efficiency of red light representing the long wavelength region.