Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
FLUORESCENT LIGHT SOURCE DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/097817
Kind Code:
A1
Abstract:
[Problem] To provide a fluorescent light source device which is provided with: a light-emitting element that radiates blue excitation light; a wavelength conversion element that is excited by the excitation light and radiates yellow fluorescence; a light collection optical system that collects the excitation light into the wavelength conversion element; and a first dichroic mirror that reflects or transmits the excitation light, and transmits or reflects the fluorescence, and which fluorescent light source device emits white light obtained by mixing the fluorescence from the wavelength conversion element and partial excitation light not converted by the wavelength conversion element, wherein even if the intensity of the excitation light fluctuates, the color temperature of the white light to be emitted can be kept constant. [Solution] This fluorescence light source device is characterized by being further provided with an auxiliary light source that radiates light in the same blue region as the excitation light, and in that the light emitted from the auxiliary light source is mixed with the white light obtained by mixing the fluorescence and the partial excitation light, from the first dichroic mirror.

Inventors:
HAYASHI KENJI (JP)
KABUKI KIYOYUKI (JP)
Application Number:
JP2018/032697
Publication Date:
May 23, 2019
Filing Date:
September 04, 2018
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
USHIO ELECTRIC INC (JP)
International Classes:
F21S2/00; F21V7/00; F21V7/28; G02B5/20; G03B21/00; G03B21/14; H01L33/00; H01S5/02; F21Y115/30
Domestic Patent References:
WO2012063322A12012-05-18
WO2014038434A12014-03-13
Foreign References:
JP2014110109A2014-06-12
JP2014174264A2014-09-22
JP2014507055A2014-03-20
JP2015138168A2015-07-30
JP2017188328A2017-10-12
Attorney, Agent or Firm:
ISOHATA Masao (JP)
Download PDF: