Light emitting device

Patent metadata

Field	Value
Publication number	US-11855409-B2
Application number	US-202217845464-A
Country	US
Kind code	B2
Filing date	Jun 21, 2022
Priority date	Dec 14, 2018
Publication date	Dec 26, 2023
Grant date	Dec 26, 2023

Abstract

A light emitting device includes a package, a cap fixed to the package, and at least one laser element. The cap includes a light-transmissive member having a lower surface facing the package and an upper surface opposite to the lower surface, and a light blocking film arranged on the lower surface of the light-transmissive member and having a shape which has at least one opening. The at least one laser element is disposed in a space bounded by the cap and the package at a position such that the at least one opening is irradiated by laser light emitted from the at least one laser element, at least a part of each of the at least one laser element being disposed in the at least one opening in the light blocking film in a top view.

First claim

What is claimed is:

1. A light emitting device comprising:
a package including a main body and a metal film provided on a surface of the main body;
a cap fixed to the package, and the cap including
a light-transmissive member having a lower surface facing the package and an upper surface opposite to the lower surface, and
a light blocking film arranged on the lower surface of the light-transmissive member and having a shape which has at least one opening;

a joining member joining a part of the light blocking film and the metal film; and
at least one laser element disposed in a space bounded by the cap and the package at a position such that the at least one opening is irradiated by laser light emitted from the at least one laser element, at least a part of each of the at least one laser element being disposed in the at least one opening in the light blocking film in a top view.

2. The light emitting device according to claim 1 , wherein
the at least one laser element has a laser element which has a light emitting end surface that is disposed in one of the at least one opening in the light blocking film in the top view and a light reflecting end surface that overlaps the light blocking film in the top view.

3. The light emitting device according to claim 1 , further comprising
at least one light reflector having a light reflecting surface reflecting the laser light from the at least one laser element toward the at least one opening in the light blocking film.

4. The light emitting device according to claim 3 , wherein
the at least one light reflector has a first light reflector having a first light reflecting surface, and
all area of the first light reflecting surface is disposed in one of the at least one opening in the light blocking film in the top view.

5. The light emitting device according to claim 1 , wherein
the at least one opening in the light blocking film is provided in a size and at a position such that all of a main part of the laser light from the at least one laser element passes in the at least one opening and
the main part of the laser light is a region of the laser light having an intensity of 1/e 2 or more with respect to a peak intensity value of the laser light.

6. The light emitting device according to claim 1 , wherein
the light blocking film extends to an outer edge of the light-transmissive member or to the vicinity of the outer edge of the light-transmissive member.

7. The light emitting device according to claim 1 , wherein
the joining member is a metal adhesive.

8. The light emitting device according to claim 1 , wherein
the metal film of the package is a first metal film, and
the light blocking film is a second metal film.

9. A light emitting device comprising:
a package including a main body and a metal film provided on a surface of the main body;
a cap fixed to the package, and the cap including
a light-transmissive member having a lower surface facing the package and an upper surface opposite to the lower surface and
a light blocking film arranged on the lower surface of the light-transmissive member and having a shape which has at least one opening;

a joining member joining a part of the light blocking film and the metal film; and
a plurality of laser elements disposed in a space bounded by the cap and the package at a position such that the at least one opening is irradiated by laser light emitted from the plurality of laser elements, the plurality of laser elements including a blue laser element configured to emit blue laser light, a green laser element configured to emit green laser light, and a red laser element configured to emit red laser light.

10. The light emitting device according to claim 9 , wherein
the light blocking film extends to an outer edge of the light-transmissive member or to the vicinity of the outer edge of the light-transmissive member.

11. The light emitting device according to claim 9 , wherein
the joining member is a metal adhesive.

12. The light emitting device according to claim 9 , wherein
the metal film of the package is a first metal film, and
the light blocking film is a second metal film.

Assignees

• Nichia Corp

Inventors

• Hashimoto Takuya
• Miura Soichiro

Classifications

• H01S5/02257 Primary

  using windows, e.g. specially adapted for back-reflecting light to a detector inside the housing · CPC title

• H01S5/02208

  characterised by the shape of the housings · CPC title

• H01S5/02255

  using beam deflecting elements · CPC title

• H01S5/4093

  Red, green and blue [RGB] generated directly by laser action or by a combination of laser action with nonlinear frequency conversion · CPC title

• H01S5/02325

  Mechanically integrated components on mount members or optical micro-benches · CPC title