Light source device and lighting device

Patent metadata

Field	Value
Publication number	US-2022018519-A1
Application number	US-201917296146-A
Country	US
Kind code	A1
Filing date	Nov 22, 2019
Priority date	Nov 26, 2018
Publication date	Jan 20, 2022
Grant date	—

Abstract

A light source device of the present disclosure includes a sapphire plate having a first surface and a second surface facing each other, a wavelength conversion material located opposite the first surface of the sapphire plate, and a first excitation light source emitting a first excitation light having directivity to the wavelength conversion material through the second surface, in which an angle between the first surface and the second surface, and a c-axis of sapphire is greater than 80°, and an angle between the c-axis and an optical axis of the first excitation light is 20° or more. A lighting device of the present disclosure includes the light source device and a light guide member.

First claim

1 . A light source device comprising:
a sapphire plate having a first surface and a second surface facing each other, a wavelength conversion material located opposite the first surface of the sapphire plate, and a first excitation light source emitting a first excitation light having directivity to the wavelength conversion material through the second surface, wherein an angle between the first surface and the second surface, and a c-axis of sapphire is greater than 80°, and an angle between the c-axis and an optical axis of the first excitation light is 20° or more.

2 . The light source device according to claim 1 , wherein an angle between the c-axis and an optical axis of the first excitation light is 40° or more.

3 . The light source device according to claim 1 , wherein an incident angle of the first excitation light to the second surface is 75° or less.

4 . The light source device according to claim 3 , wherein an incident angle of the first excitation light to the second surface is 55° or less.

5 . The light source device according to claim 1 , further comprising a second excitation source emitting a second excitation light having directivity to the wavelength conversion material through the second surface, wherein the first excitation light and the second excitation light are at least partially overlapped with the wavelength conversion material.

6 . The light source device according to claim 5 , wherein an angle between the c-axis and an optical axis of the first excitation light is different from an angle between the c-axis and an optical axis of the second excitation light.

7 . The light source device according to claim 5 , wherein an angle between an optical axis of the first excitation light and an optical axis of the second excitation light is 80° or more and 100° or less when viewed from a direction perpendicular to the second surface.

8 . The light source device according to claim 1 , comprising a dichroic film between the sapphire plate and the wavelength conversion material, transmitting the excitation light and reflecting the wavelength conversion light emitted from the wavelength conversion material.

9 . The light source device according to claim 1 , comprising an anti-reflection film on the second surface of the sapphire plate to reduce a reflectance of the excitation light.

10 . A lighting device comprising a light source device according to claim 1 and a light guide member.

Assignees

• Kyocera Corp

Inventors

• Kubo Yoshinori
• Fujimoto Kazuyoshi

Classifications

• H01S5/4025

  Array arrangements, e.g. constituted by discrete laser diodes or laser bar (H01S5/42 takes precedence) · CPC title

• H01S5/0087

  for illuminating phosphorescent or fluorescent materials, e.g. using optical arrangements specifically adapted for guiding or shaping laser beams illuminating these materials · CPC title

• F21S45/47

  Passive cooling, e.g. using fins, thermal conductive elements or openings · CPC title

• F21Y2115/30

  Semiconductor lasers · CPC title

• F21S41/176

  Light sources where the light is generated by photoluminescent material spaced from a primary light generating element · CPC title