Title:
FLUORESCENT LIGHT SOURCE DEVICE
Document Type and Number:
Japanese Patent JP2017062889
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a structure which prevents deterioration of utilization efficiency of excitation light by condensing excitation light to a fluorescent element without using a lens, in a fluorescent light source device which includes a light-emitting element for radiating excitation light, a fluorescent element for emitting fluorescent light of the wavelength longer than that of the excitation light and a first optical system for condensing the excitation light to the fluorescent element and for extracting the fluorescent light.SOLUTION: A first optical system 3 comprises a first parabolic mirror 4 and a second parabolic mirror 5 in which front open end parts are oppositely arranged on the same optical axis, and a fluorescent element 6 is arranged so as to face a first opening 41 of the apex of the first parabolic mirror 4. From a second opening 51 of the apex of the second parabolic mirror 5, fluorescent light B from the fluorescent element 6 is extracted. The first parabolic mirror 4 transmits excitation light A and reflects the fluorescent light B, and the second parabolic mirror 5 reflects the excitation light A and the fluorescent light B. The excitation light A from a light-emitting element 2 is made incident parallel with the optical axis from the back surface of the first parabolic mirror 4.SELECTED DRAWING: Figure 1
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Inventors:
YOSHIDA KAZUHIRO
Application Number:
JP2015186631A
Publication Date:
March 30, 2017
Filing Date:
September 24, 2015
Export Citation:
Assignee:
USHIO ELECTRIC INC
International Classes:
F21V7/09; F21S2/00; F21V5/04; F21V7/06; F21V7/22; G03B21/14
Attorney, Agent or Firm:
Tsutomu Igarata