Title:
PHOSPHOR ELEMENT, PHOSPHOR DEVICE, AND ILLUMINATION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2021/106854
Kind Code:
A1
Abstract:
[Problem] To suppress luminance variations of emitted white light by increasing the fluorescence intensity of emitted light when fluorescence is produced by causing excitation light to enter a phosphor portion. [Solution] A phosphor element 1 comprises an incident surface 2 for excitation light Lin, an exit surface 3 opposing the incident surface 2, and a side surface 4. At least some of the excitation light incident on the incident surface 2 is converted into fluorescence, and the fluorescence is output from the exit surface 3. The area of the exit surface 3 is greater than the area of the incident surface 2. When viewed in a cross section Z perpendicular to the exit surface 3 along a longest dividing line W dividing the exit surface 3 into two, the phosphor element 1 has an inclination region G in which an inclination angle θ formed by the side surface 4 relative to a perpendicular axis P perpendicular to the exit surface 3 increases monotonously from the incident surface 2 toward the exit surface 3.
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Inventors:
KONDO JUNGO (JP)
OKADA NAOTAKE (JP)
YAMAGUCHI SHOICHIRO (JP)
EJIRI TETSUYA (JP)
IWATA YUICHI (JP)
OKADA NAOTAKE (JP)
YAMAGUCHI SHOICHIRO (JP)
EJIRI TETSUYA (JP)
IWATA YUICHI (JP)
Application Number:
PCT/JP2020/043620
Publication Date:
June 03, 2021
Filing Date:
November 24, 2020
Export Citation:
Assignee:
NGK INSULATORS LTD (JP)
International Classes:
F21V29/502; F21V9/30; F21V29/70; G02B5/08; G02B5/10; G02B5/20; H01S5/022; F21Y115/30
Foreign References:
| JP2017076765A | 2017-04-20 | |||
| JP2009267040A | 2009-11-12 | |||
| JP2012178395A | 2012-09-13 | |||
| JP2017085038A | 2017-05-18 |
Attorney, Agent or Firm:
HOSODA Masutoshi et al. (JP)
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