Optic and illumination device

Patent metadata

Field	Value
Publication number	US-11105486-B2
Application number	US-202016983311-A
Country	US
Kind code	B2
Filing date	Aug 3, 2020
Priority date	Feb 19, 2018
Publication date	Aug 31, 2021
Grant date	Aug 31, 2021

Abstract

An optic converts wavelength of light from a light source. The optic includes a first substrate and a second substrate. The first substrate includes a fluorescent material substrate. The second substrate supports the first substrate. The second substrate includes a translucent substrate to receive the light from the light source through the first substrate. The translucent substrate has an oriented polycrystalline structure to have a crystalline anisotropy in refractive index.

First claim

The invention claimed is:

1. An optic to convert wavelength of light from a light source, comprising:
a first substrate including a fluorescent material substrate; and
a second substrate to support the first substrate, wherein
the second substrate includes a translucent substrate to receive light from the light source through the first substrate, the translucent substrate having an oriented polycrystalline structure to have a crystalline anisotropy in refractive index.

2. The optic according to claim 1 , wherein
the polycrystalline structure of the translucent substrate has a degree of orientation of 10% or more and 99.5% or less.

3. The optic according to claim 1 , wherein
the translucent substrate has a higher refractive index than the fluorescent material substrate.

4. The optic according to claim 1 , wherein
the translucent substrate has a higher thermal conductivity than the fluorescent material substrate.

5. The optic according to claim 1 , wherein
a coefficient of linear expansion of the translucent substrate is within ±50% of a coefficient of linear expansion of the fluorescent material substrate.

6. The optic according to claim 1 , wherein
the translucent substrate is made of aluminum nitride or aluminum oxide.

7. The optic according to claim 1 , wherein
the fluorescent material substrate has a polycrystalline structure.

8. The optic according to claim 1 , wherein
the translucent substrate has an entrance surface to receive the light from the light source through the first substrate, an exit surface opposite the entrance surface, and a side surface to connect the entrance surface and the exit surface to each other.

9. The optic according to claim 8 , further comprising
a dielectric film disposed over the side surface of the translucent substrate and having a lower refractive index than the translucent substrate.

10. The optic according to claim 8 , further comprising
a reflective film disposed directly or indirectly over the side surface of the translucent substrate.

11. The optic according to claim 8 , wherein
the exit surface is different from the entrance surface in area.

12. The optic according to claim 8 , wherein
at least portion of the side surface has an angle smaller than a right angle from the entrance surface.

13. The optic according to claim 8 , wherein
at least portion of the side surface has an angle greater than a right angle from the entrance surface.

14. The optic according to claim 1 , further comprising
a junction layer disposed between the first substrate and the second substrate, the junction layer containing at least one element contained in a surface of the first substrate facing the second substrate and at least one element contained in a surface of the second substrate facing the first substrate.

15. The optic according to claim 1 , wherein
the first substrate includes a first intermediate layer facing the second substrate, the first intermediate layer being made of a material different from a material for the fluorescent material substrate.

16. The optic according to claim 1 , wherein
the second substrate includes a second intermediate layer facing the first substrate, the second intermediate layer being made of a material different from a material for the translucent substrate.

17. An illumination device comprising:
a light source; and
an optic to convert wavelength of light from the light source, wherein
the optic includes:
a first substrate including a fluorescent material substrate; and
a second substrate to support the first substrate, and
the second substrate includes a translucent substrate to receive the light from the light source through the first substrate, the translucent substrate having an oriented polycrystalline structure to have a crystalline anisotropy in refractive index.

18. The illumination device according to claim 17 , wherein the light source includes a laser.

Assignees

• Ngk Insulators Ltd

Inventors

• Ohwada Iwao
• Kondo Jungo
• Kobayashi Yoshimasa

Classifications

• G02B2207/113

  Fluorescence · CPC title

• F21S41/12 Primary

  characterised by the type of emitted light · CPC title

• G02B5/3083

  Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001) · CPC title

• F21S41/285

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

• G02B5/20

  Filters (polarising elements G02B5/30) · CPC title