Light source unit, and light emitting device for mobile body

Patent metadata

Field	Value
Publication number	US-12007090-B2
Application number	US-202318160805-A
Country	US
Kind code	B2
Filing date	Jan 27, 2023
Priority date	Apr 12, 2019
Publication date	Jun 11, 2024
Grant date	Jun 11, 2024

Abstract

A light source unit includes: a light source part that emits excitation light; a light emitting part that emits generated light by being irradiated with the excitation light; a support part that guides the excitation light to the light emitting part while supporting the light emitting part; and a reflective part provided on a back surface of the support part, the back surface being on a side opposite to an emission direction of the generated light.

First claim

The invention claimed is:

1. A vehicular lamp with a lamp chamber comprising:
a light source for emitting excitation light, the light source having a light emitting surface which emits a Lambertian distribution of said excitation light;
a convex reflective part;
a light emitting layer including organic material or inorganic material and for emitting generated light by being irradiated with the excitation light, and
a lens through which the generated light travels to the outside of the lamp chamber so that the generated light is emitted from the vehicular lamp, wherein:
the excitation light from the light source is dispersed by the convex reflective part and travels to the light emitting layer so that the light emitting layer emits the generated light and performs surface emission,
the light emitting layer is provided on an inner surface of the lens, and
the light emitting layer is excited by being irradiated with blue excitation light to emit red generated light and the vehicle lamp functions as a tail lamp.

2. A vehicular lamp of claim 1 , further comprising:
a light source part including the light source, wherein:
the light source is provided such that a light emitting surface of the light source faces the convex reflective part, and
the light source part is prevented from being visually recognized from outside of the vehicle.

3. A vehicular lamp of claim 2 , further comprising:
a support substrate on which the light source is mounted, and
a heat radiating member for radiating heat from the light source, wherein the support substrate is provided on the heat radiating member.

4. A vehicular lamp of claim 1 , further comprising a sealing part formed of a material that transmits the excitation light and the generated light, wherein the sealing part is provided on the inner side of the light emitting layer so as to cover an entire surface of the light emitting layer and cooperates with the lens to prevent the light emitting layer from being exposed to air.

5. A vehicular lamp of claim 4 , further comprising a filter part provided on an outer surface of the lens, wherein the filter part is formed in the form of thin film by applying a coating having a function of UV cutting to an outer surface of the lens and is transparent.

6. A vehicular lamp of claim 1 , wherein the light emitting layer is transparent in a state in which there is no irradiation with the excitation light.

7. A vehicular lamp of claim 1 , wherein the light emitting layer includes at least one material from a red phosphorescent material, a blue phosphorescent material, a yellow phosphorescent material, and a green phosphorescent material.

8. A vehicular lamp of claim 1 , wherein the light emitting layer is formed in the form of a thin film including organic material.

9. A vehicular lamp with a lamp chamber comprising:
a light source for emitting excitation light, the light source having a light emitting surface which emits a Lambertian distribution of said excitation light;
a convex reflective part;
a light emitting layer including organic material or inorganic material and for emitting generated light by being irradiated with the excitation light, and
a lens through which the generated light travels to the outside of the lamp chamber so that the generated light is emitted from the vehicular lamp, wherein:
the excitation light from the light source is dispersed by the convex reflective part and travels to the light emitting layer so that the light emitting layer emits the generated light and performs surface emission, and
the light emitting layer is excited by being irradiated with blue excitation light to emit red generated light and the vehicle lamp functions as a tail lamp.

10. A vehicular lamp of claim 9 , further comprising:
a light source part including the light source, wherein:
the light source is provided such that a light emitting surface of the light source faces the convex reflective part, and
the light source part is prevented from being visually recognized from outside of the vehicle.

11. A vehicular lamp of claim 10 , further comprising:
a support substrate on which the light source is mounted, and
a heat radiating member for radiating heat from the light source, wherein the support substrate is provided on the heat radiating member.

12. A vehicular lamp of claim 9 , wherein the light emitting layer is provided on an inner surface of the lens.

13. A vehicular lamp of claim 12 , further comprising a sealing part formed of a material that transmits the excitation light and the generated light, wherein the sealing part is provided on the inner side of the light emitting layer so as to cover an entire surface of the light emitting layer and cooperates with the lens to prevent the light emitting layer from being exposed to air.

14. A vehicular lamp of claim 13 , further comprising a filter part provided on an outer surface of the lens, wherein the filter part is formed in the form of thin film by applying a coating having a function of UV cutting to an outer surface of the lens and is transparent.

15. A vehicular lamp of claim 9 , wherein the light emitting layer is transparent in a state in which there is no irradiation with the excitation light.

16. A vehicular lamp of claim 9 , wherein the light emitting layer includes at least one material from a red phosphorescent material, a blue phosphorescent material, a yellow phosphorescent material, and a green phosphorescent material.

17. A vehicular lamp of claim 9 , wherein the light emitting layer is formed in the form of a thin film including organic material.

18. A vehicular lamp with a lamp chamber comprising:
a light source for emitting excitation light, the light source having a light emitting surface which emits a Lambertian distribution of said excitation light;
a convex reflective part;
a light emitting layer including organic material or inorganic material and for emitting generated light by being irradiated with the excitation light, and
a lens through which the generated light travels to the outside of the lamp chamber so that the generated light is emitted from the vehicular lamp, wherein:
the wavelength of the excitation light is shorter than the wavelength of the generated light, and
the excitation light from the light source is dispersed by the convex reflective part and travels to the light emitting layer so that the light emitting layer emits the generated light and performs surface emission so that the vehicular lamp functions as a lamp.

19. A vehicular lamp of claim 18 , further comprising:
a light source part including the light source, wherein:
the light source is provided such that a light emitting surface of the light source faces the convex reflective part and
the light source part is prevented from being visually recognized from outside of the vehicle.

20. A vehicular lamp of claim 19 , further comprising:
a support substrate on which the light source is mounted, and
a heat radiating member for radiating heat from the light source, wherein the support substrate is provided on the heat radiating member.

21. A vehicular lamp of claim 18 , wherein the light emitting layer is provided on an inner surface of the lens.

22. A vehicular lamp of claim 21 , further comprising a sealing part formed of a material that transmits the excitation light and the generated light, wherein the sealing part is provided on the inner side of the light emitting layer so as to cover an entire surface of the

Assignees

• Ichikoh Industries Ltd

Inventors

• Mochimaru Harumi

Classifications

• F21S45/10

  Protection of lighting devices (cooling of lighting devices F21S45/40; waterproofing of lighting devices F21S45/50) · CPC title

• F21S43/245

  emitting light from one or more of its major surfaces · CPC title

• F21S43/247

  with a single light source being coupled into the light guide · CPC title

• F21S43/255

  Filters · CPC title

• F21S43/40

  characterised by the combination of reflectors and refractors · CPC title