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    LIGHT EMITTING DEVICE, MANUFACTURING METHOD THEREFOR, AND WAVEGUIDE STRUCTURE
    2.
    发明申请
    LIGHT EMITTING DEVICE, MANUFACTURING METHOD THEREFOR, AND WAVEGUIDE STRUCTURE 有权

    公开(公告)号：US20230021122A1

    公开(公告)日：2023-01-19

    申请号：US17807889

    申请日：2022-06-21

    Applicant: Panasonic Intellectual Property Management Co., Ltd.

    Inventor： TAKEHIRO ASAHI ,  NAOYA RYOKI ,  YUKIO NISHIKAWA ,  YOSHIO OKAYAMA

    IPC: F21V8/00

    Abstract: A light emitting device includes a light source and a waveguide structure. The light source emits light having a directionality. The waveguide structure includes an optical waveguide and an exterior part. The optical waveguide has an incident end surface and an emission end surface, converts a wavelength of the light incident from the incident end surface, and emits the light from the emission end surface. The exterior part is optically transparent and covers the optical waveguide such that the incident end surface and the emission end surface are exposed from the exterior part. The optical waveguide is elongated in a length direction. The length direction of the optical waveguide is inclined at a predetermined angle with respect to an optical axis of the light in a predetermined plane including the length direction of the optical waveguide and the optical axis of the light. The predetermined angle is set to allow the light to propagate in the optical waveguide with total internal reflection at a boundary surface between the optical waveguide and the exterior part.

    RAMO4 SUBSTRATE AND METHOD OF MANUFACTURE THEREOF, AND GROUP III NITRIDE SEMICONDUCTOR
    3.
    发明申请
    RAMO4 SUBSTRATE AND METHOD OF MANUFACTURE THEREOF, AND GROUP III NITRIDE SEMICONDUCTOR 审中-公开

    公开(公告)号：US20200181801A1

    公开(公告)日：2020-06-11

    申请号：US16691542

    申请日：2019-11-21

    Applicant: Panasonic Intellectual Property Management Co., Ltd.

    Inventor： NAOYA RYOKI ,  KENTARO MIYANO ,  MASAKI NOBUOKA ,  AKIHIKO ISHIBASHI

    IPC: C30B29/26 ,  H01L29/20 ,  H01L29/205 ,  H01L21/02 ,  C30B15/22 ,  C30B29/40 ,  C30B25/18

    Abstract: A RAMO4 substrate that does not easily crack during or after the formation of group III nitride crystal includes a single crystal represented by general formula RAMO4 (wherein R represents one or more trivalent elements selected from the group consisting of Sc, In, Y, and lanthanoid elements, A represents one or more trivalent elements selected from the group consisting of Fe(III), Ga, and Al, and M represents one or more divalent elements selected from the group consisting of Mg, Mn, Fe(II), Co, Cu, Zn, and Cd). The RAMO4 substrate has a crystal plane with a curvature radius r of 52 m or more, and a square value of correlation coefficient ρ of 0.81 or more. The curvature radius r is calculated as an absolute value from X-ray peak position ωi and measurement position Xi after the measurements of X-ray peak positions ωi at a plurality of positions Xi lying on a straight line passing through the center of the RAMO4 substrate. The correlation coefficient ρ is a measure of correlation between ω and measurement position Xi.

    LIGHT EMITTING DEVICE, MANUFACTURING METHOD, AND WAVEGUIDE STRUCTURE
    5.
    发明申请
    LIGHT EMITTING DEVICE, MANUFACTURING METHOD, AND WAVEGUIDE STRUCTURE 有权

    公开(公告)号：US20220190557A1

    公开(公告)日：2022-06-16

    申请号：US17512632

    申请日：2021-10-27

    Applicant: Panasonic Intellectual Property Management Co., Ltd.

    Inventor： NAOYA RYOKI ,  YUKIO NISHIKAWA ,  TAKEHIRO ASAHI ,  YOSHIO OKAYAMA

    IPC: H01S5/10 ,  H01S5/14 ,  H01S3/063

    Abstract: A light emitting device includes a light source that emits light having a directivity from a light emitting surface of the light source, a waveguide structure that includes an optical waveguide having an inlet facing the light emitting surface, and a peripheral wall protruding from the inlet toward the light emitting surface, and a lens that is provided between the light emitting surface and the inlet. The peripheral wall has an inner surface surrounding the inlet. The peripheral wall has a first opening closer to the light emitting surface and a second opening closer to the inlet. The first opening is larger than the second opening. The peripheral wall includes a narrow opening portion in which an internal space of the peripheral wall is smaller than the lens when viewed from a direction of an optical axis of the light. The inner surface of the peripheral wall includes an inclined surface that inclines so that the internal space becomes narrower as approaching the inlet, at least in the narrow opening portion. The lens is disposed in contact with the narrow opening portion in the internal space of the peripheral wall.

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