Light source device with uniformity in color temperature of emission
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United States of America Patent
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Apr 17, 2001
Grant Date -
N/A
app pub date -
Nov 12, 1998
filing date -
Nov 19, 1997
priority date (Note) -
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Abstract
A light source device outputs illumination light with highly uniform tint. The light source device is comprises a scattering guide provided with scattering power inside, a light supplier to supply light to an end face portion of the scattering guide. Light is introduced into the scattering guide plate to be followed by emission from an emission face of the scattering guide. Scattering efficiency is intentionally balanced in a long wavelength region and in a short wavelength region so that regions near the end face and far from the end face are approximately equal in color temperature of output light. Relation between Q(R), efficiency in a long wavelength region, and Q(B), scattering efficiency in a short wavelength region, are designed so that k=Q(B)/Q(R) falls within a range 0.75.ltoreq.k.ltoreq.1.25.
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