公开(公告)号：US20240372316A1

公开(公告)日：2024-11-07

申请号：US18779051

申请日：2024-07-21

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： YUKIO NISHIKAWA ,  TAKEHIRO ASAHI ,  YOSHIO OKAYAMA

IPC: H01S5/02253

Abstract: Light-emitting device (1) includes waveguide structure (5) and exterior part (4). Waveguide structure (5) includes light receiving surface (51) including incident end surface (31) and first surface (41), and radiation surface (52) including emission end surface (32) and second surface (42). A position of waveguide structure (5) with respect to light source (2) is determined to cause light (L1) to be incident on light receiving surface (51). Incident range (R) on which light (L1) is incident on light receiving surface (51) includes at least a part of incident end surface (31) and at least a part of first surface (41) such that a part of light (L1) is incident on incident end surface (31) and another part of light (L1) is incident on first surface (41), passes through exterior part (4), and is emitted from second surface (42).

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.

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.