PHOSPHOR ELEMENT, PHOSPHOR DEVICE, AND ILLUMINATION DEVICE

WIPO Patent Application WO/2021/106906

A1

[Problem] To increase the fluorescence intensity of emitted light and minimize luminance unevenness of emitted white light when excitation light is incident on a phosphor element and fluorescence is generated. [Solution] A phosphor element 17, provided with an incidence surface 3 on which excitation light is incident, and a side surface 4 and a reflective surface 2 opposite the incidence surface 3. The phosphor element 17 converts at least some of the excitation light incident on the incidence surface 3 into fluorescence, and emits the fluorescence from the incidence surface 3. The area of the incidence surface 3 is greater than the area of the reflective surface. When viewed in cross-section Z perpendicular to the incidence surface along the longest partition line W bisecting the incidence surface 3, there is provided an incline region G in which the incline angle θ formed by the side surface 4 with respect to a perpendicular axis P perpendicular to the incidence surface 3 monotonously increases from the reflective surface to the incidence surface.

KONDO JUNGO (JP)
OKADA NAOTAKE (JP)
YAMAGUCHI SHOICHIRO (JP)
EJIRI TETSUYA (JP)
IWATA YUICHI (JP)

PCT/JP2020/043751

June 03, 2021

November 25, 2020

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NGK INSULATORS LTD (JP)

F21V29/502; F21S41/16; F21S41/176; F21V7/26; F21V29/70; G02B5/08; G02B5/10; G02B5/20; F21Y115/30

JP2017194706A	2017-10-26
JP2002008425A	2002-01-11
JP2019096872A	2019-06-20
JP2015230760A	2015-12-21

HOSODA Masutoshi et al. (JP)

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