Light source device and lighting device

• US 8,872,208 B2
• Filed: 05/21/2012
• Issued: 10/28/2014
• Est. Priority Date: 05/20/2011
• Status: Active Grant

• Current Assignee: Stanley Electric Company Limited
• Original Assignee: Stanley Electric Company Limited
• Inventors: Kawakami, Yasuyuki
• Primary Examiner(s): ARMAND, MARC ANTHONY
• Application Number:
  US13/476,745
• Publication Number:
  US 20130056775A1
• Time in Patent Office: 890 Days
• Field of Search: 257/98, 257/E33.061
• US Class Current: 257/98
• CPC Class Codes: F21S 41/16 Laser light sources
• CPC Class Codes: F21S 41/176 Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
• CPC Class Codes: F21S 41/32 Optical layout thereof
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 9/30 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 Class Codes: F21V 9/45 by adjustment of photoluminescent elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02F 1/00 Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics

Abstract

A light source can include: a light source that emits light of a predetermined wavelength within a wavelength region covering the wavelength of ultraviolet light and that of visible light; and a wavelength conversion layer containing a fluorescent material of at least one type that is excited by excitation light from the fixed light source to emit fluorescent light of a wavelength longer than that of light emitted from the fixed light source. The fixed light source and the wavelength conversion layer can be spaced from each other. The light source device can employ a reflection system of extracting at least fluorescent light from an incident surface of the wavelength conversion layer through which excitation light from the fixed light source enters the wavelength conversion layer. The wavelength conversion layer can have a surface structure with depressions or projections.

Claims

1. A light source device, comprising:

a light source configured to emit light of a predetermined wavelength within a wavelength region covering the wavelength of ultraviolet light and the wavelength of visible light;

a wavelength conversion layer including a wavelength conversion material of at least one type that is excited by excitation light from the light source to emit fluorescent light of a wavelength longer than the wavelength of light emitted from the light source,

the light source and the wavelength conversion layer being spaced from each other, the light source device employing a reflection system of extracting at least fluorescent light from an incident surface of the wavelength conversion layer through which excitation light from the light source enters the wavelength conversion layer, the wavelength conversion layer having a surface structure with at least one of depressions and projections;

a heat dissipation substrate having light reflectivity heat conductivity; and

a connecting part configured to connect the wavelength conversion layer to the heat dissipation substrate.

2. The light source device according to claim 1, wherein the wavelength conversion layer includes a fluorescent plate, and the at least one of depressions and projections are configured as a plurality of segments on the fluorescent plate, and a size of each of the segments is smaller than a size of an irradiation spot of excitation light received from the light source.

3. The light source device according to claim 1, wherein the wavelength conversion layer is a fluorescent ceramic.

4. The light source device according to claim 2, wherein the wavelength conversion layer is a fluorescent ceramic.

5. The light source device according to claim 1, further comprising:

a fluorescent rotary body including the wavelength conversion layer.

6. The light source device according to claim 2, further comprising:

a fluorescent rotary body including the wavelength conversion layer.

7. The light source device according to claim 3, further comprising:

a fluorescent rotary body including the wavelength conversion layer.

8. The light source device according to claim 4, further comprising:

a fluorescent rotary body including the wavelength conversion layer.

9. The light source device according to claim 1, wherein the wavelength conversion layer is a fluorescent layer.

10. The light source device according to claim 2, wherein the wavelength conversion layer is a fluorescent layer.

11. The light source device according to claim 3, wherein the wavelength conversion layer is a fluorescent layer.

12. The light source device according to claim 4, wherein the wavelength conversion layer is a fluorescent layer.

13. The light source device according to claim 5, wherein the wavelength conversion layer is a fluorescent layer.

14. The light source device according to claim 6, wherein the wavelength conversion layer is a fluorescent layer.

15. The light source device according to claim 7, wherein the wavelength conversion layer is a fluorescent layer.

16. The light source device according to claim 8, wherein the wavelength conversion layer is a fluorescent layer.

17. A lighting device configured to include the light source as recited in claim 1.

18. The light source device according to claim 1, wherein the light source is a fixed light source.

19. The light source device according to claim 1, further comprising:

a half mirror located between the light source and the wavelength conversion layer.

20. The light source device according to claim 1, further comprising:

at least one of a gas and a vacuum located between the light source and the wavelength conversion layer.

21. The light source device according to claim 1, wherein the connecting part is made of a material having light reflectivity and heat conductivity.