US 12,085,240 B2
Illumination apparatus
Kunihiko Onobori, Friedberg (DE); and Tilman Schröter, Friedberg (DE)
Assigned to HOYA CORPORATION, Tokyo (JP)
Appl. No. 18/013,153
Filed by HOYA CORPORATION, Tokyo (JP)
PCT Filed Jun. 24, 2021, PCT No. PCT/IB2021/055587
§ 371(c)(1), (2) Date Dec. 27, 2022,
PCT Pub. No. WO2022/003503, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 10 2020 117 580.9 (DE), filed on Jul. 3, 2020.
Prior Publication US 2023/0280001 A1, Sep. 7, 2023
Int. Cl. F21K 9/64 (2016.01); A61B 1/06 (2006.01); F21W 131/20 (2006.01); F21Y 113/10 (2016.01); F21Y 115/10 (2016.01); F21Y 115/30 (2016.01)
CPC F21K 9/64 (2016.08) [A61B 1/0653 (2013.01); F21W 2131/20 (2013.01); F21Y 2113/10 (2016.08); F21Y 2115/10 (2016.08); F21Y 2115/30 (2016.08)] 18 Claims
OG exemplary drawing
 
1. An illumination apparatus, comprising
a board comprising an adhesive;
a first light source mounted on the board, wherein the first light source is configured to emit first light having a first wavelength spectrum;
a second light source mounted on the board, wherein the second light source is configured to emit second light having a second wavelength spectrum different from the first wavelength spectrum; and
a phosphor layer comprising a phosphor arranged to convert at least a part of at least one of the first light and the second light into first converted light and second converted light, respectively, wherein a third wavelength spectrum of the first converted light is different from the first wavelength spectrum, and a fourth wavelength spectrum of the second converted light is different from the second wavelength spectrum; wherein
the phosphor layer is configured to emit a remaining part of the first light, a remaining part of the second light, and the at least one of the first converted light and the second converted light;
the phosphor layer is in contact with the first light source and the second light source and continuous on the first light source, on the second light source, and on a path on the board connecting the first light source and the second light source;
the phosphor layer and the board surround the first light source and the second light source;
the adhesive adheres to the phosphor layer; and
a maximum thickness of the adhesive is not larger than 10% of a maximum thickness of a light source among the first light source and the second light source having a smallest maximum thickness among the first light source and the second light source.