US 12,438,336 B2
Phosphor element, phosphor device, and illumination apparatus
Jungo Kondo, Miyoshi (JP); Naotake Okada, Anjo (JP); Shoichiro Yamaguchi, Ichinomiya (JP); Tetsuya Ejiri, Kasugai (JP); and Yuichi Iwata, Nagoya (JP)
Assigned to NGK INSULATORS, LTD., Nagoya (JP)
Filed by NGK Insulators, Ltd., Nagoya (JP)
Filed on May 18, 2022, as Appl. No. 17/663,846.
Application 17/663,846 is a continuation of application No. PCT/JP2020/043620, filed on Nov. 24, 2020.
Claims priority of application No. 2019-213171 (JP), filed on Nov. 26, 2019.
Prior Publication US 2022/0278506 A1, Sep. 1, 2022
Int. Cl. H01S 3/17 (2006.01); H01S 3/06 (2006.01); H01S 5/024 (2006.01); H01S 5/06 (2006.01); H01S 5/183 (2006.01)
CPC H01S 3/175 (2013.01) [H01S 3/0625 (2013.01); H01S 5/02476 (2013.01); H01S 5/0611 (2013.01); H01S 5/18352 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A phosphor element comprising an incident face for an excitation light, an emitting face opposing said incident face and a side face, said phosphor element converting at least a part of said excitation light incident onto said incident face into a fluorescence and emitting said fluorescence from said emitting face:
wherein said emitting face has a convex shape and an area greater that an area of said incident face;
wherein said phosphor element comprises an inclination region in which an inclination angle of said side face with respect to a vertical axis perpendicular to said emitting face is monotonously increased from said incident face toward said emitting face, viewed in a cross-section perpendicular to said emitting face and along the longest dividing line halving said emitting face; and
wherein said phosphor element comprises a plurality of said inclination regions along said side face.