Illumination Device and Image Display Apparatus

• US 20200133109A1
• Filed: 12/27/2019
• Published: 04/30/2020
• Est. Priority Date: 06/18/2010
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kita, Koji
• Granted Patent: US 10,852,630 B2
• Time in Patent Office: Days
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 13/14 the elements being filters or photoluminescent elements, reflectors and refractors
• CPC Class Codes: F21V 14/04 by movement of reflectors in vehicle head lamps F21S41/675
• CPC Class Codes: F21V 14/08 by movement of the screens or filters
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21V 7/05 plane
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: F21V 9/14 for producing polarised light
• CPC Class Codes: F21V 9/32 characterised by the arrangement of the photoluminescent material
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: F21Y 2115/30 Semiconductor lasers
• CPC Class Codes: G02B 26/008 in the form of devices for effecting sequential colour changes, e.g. colour wheels
• CPC Class Codes: G02B 27/283 used for beam splitting or combining
• CPC Class Codes: G03B 21/006 using LCD's
• CPC Class Codes: G03B 21/142 Adjusting of projection optics
• CPC Class Codes: G03B 21/204 using secondary light emission, e.g. luminescence or fluorescence using different colours G03B33/00; if related to video signals H04N9/3197
• CPC Class Codes: G03B 21/2073 Polarisers in the lamp house peculiar to electronic spatial light modulators H04N9/3197

Abstract

An illumination device includes: an excitation light source that emits excitation light having a first wavelength; and a fluorescent member that includes a fluorescent substance that, when it is irradiated with the excitation light, emits light having a second wavelength longer than the first wavelength, transmits a part of the excitation light and reflects another part of the excitation light, and a first reflective film provided at a side of the fluorescent substance, which is opposite to an excitation light incidence side, the fluorescent member emitting multiplexed light including an excitation light component reflected from the fluorescent substance and the first reflective film and a light component emitted from the fluorescent substance.

Claims

1-9. -9. (canceled)

10. A light source system comprising:

an excitation light source configured to emit excitation light via an excitation light path, the excitation light having a spectrum with a first peak wavelength;

a fluorescent portion configured to include (i) a fluorescent substance that, responsive to an irradiation of the excitation light, emits light having a spectrum with a second peak wavelength which is different from the first peak wavelength, and (ii) a reflective portion that is provided at a side of the fluorescent substance and reflects at least one of the excitation light or the light emitted from the fluorescent substance;

a reflective mirror provided between the excitation light source and the fluorescent portion, the reflective mirror not permitting transmission of the first wavelength and the second wavelength; and

a condensing optical system provided between the excitation light source and the fluorescent portion.

11. The light source system of claim 10, wherein the reflective mirror comprises a transparent substrate and reflective film formed on a surface of the transparent substrate.

12. The light source system of claim 11, wherein the transparent substrate is plate shaped.

13. The light source system of claim 11, wherein the reflective film is formed with a size approximately equal to a spot diameter of the excitation light.

14. The light source system of claim 10, wherein the reflective mirror is slanted approximately 45 degrees with respect to an incidence direction of excitation light.

15. A light source system comprising:

an excitation light source that emits excitation light, the excitation light having a spectrum with a first peak wavelength;

a fluorescent portion configured to include (i) a fluorescent substance that, responsive to irradiation by the excitation light, emits light having a spectrum with a second peak wavelength which is different from the first peak wavelength, and (ii) a reflective portion that is provided at a side of the fluorescent substance and reflects at least one of the light having the first peak wavelength or the light having the second peak wavelength;

a reflective mirror provided between the excitation light source and the fluorescent portion, the reflecting mirror blocking transmission of the first wavelength and the second wavelength; and

a condensing optical system provided between the excitation light source and the fluorescent portion.

16. The light source system of claim 15, wherein the reflective mirror comprises a transparent substrate and reflective film formed on a surface of the transparent substrate.

17. The light source system of claim 16, wherein the transparent substrate is plate shaped.

18. The light source system of claim 16, wherein the reflective film is formed with a size approximately equal to the a spot diameter of the excitation light.

19. The light source system of claim 15, wherein the reflective mirror is slanted approximately 45 degrees with respect to an incidence direction of excitation light.