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US 12,001,046 B2Granted
Light-emitting device
AssigneeNichia Corporation
InventorKeiji Emura
Life of this patent
Estimating the term…
Abstract
A light-emitting device includes a light-emitting element, a light guide member surrounding the light-emitting element, a diffuser plate located on the light-emitting element and on the light guide member, and a metal pattern located at an upper surface of the diffuser plate. The diffuser plate contacts the light-emitting element and diffuses light emitted from the light-emitting element. A proportion of a region of the upper surface of the diffuser plate where the metal pattern is not located increases as a distance from the light-emitting element increases.
Claims20
A light-emitting device, comprising:
- a light-emitting element;
- a light guide member surrounding the light-emitting element;
- a diffuser plate located on the light-emitting element and on the light guide member, the diffuser plate contacting the light-emitting element and diffusing light emitted from the light-emitting element;
- and
- a metal pattern located at an upper surface of the diffuser plate,
- wherein a proportion of a region with no metal pattern on the upper surface of the diffuser plate increases as a distance from the light emitting element increases
- wherein the metal pattern includes a plurality of elongated extension portions extending in a direction away from the light-emitting element in a top view, wherein base portions of the elongated extension portions are connected to each other in the top view,
- wherein tips of the elongated extension portions are separated from each other in the top view and reach an outer edge of the diffuser plate in the top view,
- wherein the elongated extension portions include
- a plurality of first elongated extension portions extending in a first direction from the light-emitting element in the top view,
- a plurality of second elongated extension portions extending in a direction opposite to the first direction from the light-emitting element in the top view,
- a plurality of third elongated extension portions extending in a second direction perpendicular to the first direction from the light-emitting element in the top view, and
- a plurality of fourth elongated extension portions extending in a direction opposite to the second direction from the light-emitting element in the top view,
- wherein each of the plurality of first elongated extension portions and the plurality of second elongated extension portions has a length in the second direction that becomes shorter as a distance from the light-emitting element becomes longer,
- wherein each of the plurality of third elongated extension portions and the plurality of fourth elongated extension portions has a length in the first direction that becomes shorter as a distance from the light-emitting element becomes longer, and
- wherein the metal pattern is located above the light-emitting element.
13 more elements
Dependencies are inferred from the claim text.