Light emitting device

Patent metadata

Field	Value
Publication number	US-10253933-B2
Application number	US-201715690038-A
Country	US
Kind code	B2
Filing date	Aug 29, 2017
Priority date	Aug 30, 2016
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

A light emitting device includes: a base; a laser element disposed on an upper face of the base and adapted to laterally emit a laser beam; a phosphor member disposed on the upper face of the base; a first optical member disposed on the upper face of the base, the first optical member comprising an entry-side lateral face through which the laser beam enters during use and an exit-side lateral face through which the laser beam exits during use, and the first optical member being configured to change a traveling direction of the laser beam such that the laser beam transmitted through the first optical member irradiates an upper face of the phosphor member; and a cap comprising: a light shielding member, and a light transmissive member located over the through hole, the laser element, the phosphor member, and the first optical member. The light shielding member includes a protruded portion extending downward to a position that is lower than an upper end of the first optical member so as to face the exit-side lateral face of the first optical member.

First claim

What is claimed is:

1. A light emitting device comprising:
a base;
a laser element disposed on an upper face of the base and adapted to laterally emit a laser beam along the upper face of the base;
a phosphor member disposed on the upper face of the base and adapted to emit fluorescent light when irradiated with the laser beam;
a first optical member disposed between the laser element and the phosphor member on the upper face of the base, the first optical member comprising an entry-side lateral face through which the laser beam enters during use and an exit-side lateral face through which the laser beam exits during use, and the first optical member being configured to change a traveling direction of the laser beam such that the laser beam is irradiated to the phosphor member; and
a cap covering the laser element, the first optical member, and the phosphor member, the cap comprising:
a light shielding member having a through hole at a position opposite to the phosphor member such that light from the phosphor member passes through the through hole, and
a light transmissive member covering the through hole,

wherein the light shielding member includes a protruded portion extending from a circumference of the through hole toward the upper face of the base so as to face the exit-side lateral face of the first optical member.

2. The light emitting device according to claim 1 , wherein the protruded portion has a tubular shape, and includes an upper opening corresponding to an upper end of the through hole and a lower opening corresponding to a lower end of the through hole.

3. The light emitting device according to claim 2 , wherein the phosphor member is disposed inward of the lower opening when viewed from above.

4. The light emitting device according to claim 1 , wherein the through hole includes an inner wall that is inclined such that the through hole widens from a lower side to an upper side thereof.

5. The light emitting device according to claim 1 further comprising:
a second optical member disposed between the laser element and the first optical member, the second optical member being configured to condense rays of the laser beam or convert the rays of the laser beam into parallel rays.

6. The light emitting device according to claim 1 , wherein:
the first optical member comprises a bottom face contiguous with the exit-side lateral face, and
the exit-side lateral face and the bottom face of the first optical member form an acute angle.

Assignees

• Nichia Corp

Inventors

• Kiyota Seiji
• Okahisa Eiichiro

Classifications

• F21S41/285

  Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805 · CPC title

• F21K9/64 Primary

  using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer · CPC title

• F21V11/08

  using diaphragms containing one or more apertures · CPC title

• F21V9/30

  Elements containing photoluminescent material distinct from or spaced from the light source (shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40) · CPC title

• H01S5/005

  Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping (H01S5/026, H01S5/18388 take precedence) · CPC title