Light source apparatus

• US 8,405,299 B2
• Filed: 12/22/2009
• Issued: 03/26/2013
• Est. Priority Date: 12/19/2008
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Toda, Naohiro, Noguchi, Hiroki, Tanaka, Kenichiro
• Primary Examiner(s): Santiago, Mariceli
• Application Number:
  US12/654,459
• Publication Number:
  US 20100157573A1
• Time in Patent Office: 1,190 Days
• Field of Search: 362/84, 362/231, 313483-487, 313498-512
• US Class Current: 313/501
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

A light source apparatus includes a first light emitter, a second light emitter, and a third light emitter. The first light emitter has a peak wavelength within the range from 600 nm to 660 nm and a wavelength range at half peak intensity wider than the range from 600 nm to 660 nm, the second light emitter has a peak wavelength within the range from 530 nm to 570 nm and a wavelength range at half peak intensity wider than the range from 530 nm to 570 nm, and the third light emitter which a peak wavelength is 420 nm-470 nm in a spectral power distribution thereof.

Claims

1. A white light source apparatus of an illumination system comprising:

a first light emitter having a peak wavelength within the range from 600 nm to 660 nm and a wavelength range at half peak intensity wider than the range from 600 nm to 660 nm;

a second light emitter having a peak wavelength within the range from 530nm to 570 nm and a wavelength range at half peak intensity wider than the range from 530 nm to 570 nm; and

a third light emitter having a peak wavelength from 420 nm to 470 nm in a spectral power distribution thereof,

wherein the third light emitter has a wavelength range at one eighth peak intensity wider than the range from 480 nm to 660 nm.

2. The white light source apparatus of claim 1, wherein each of the first and second light emitter includes a light emitting diode serving as a light source having a peak wavelength below 530 nm, and a visible light component below 480 nm of the first light emitter is substantially zero.

3. The white light source apparatus of claim 1, wherein a visible light component below 480 nm of the second light emitter is substantially zero.

4. The white light source apparatus of claim 2, wherein a visible light component below 480 nm of the second light emitter is substantially zero.

5. The white light source apparatus of claim 1, wherein each of the first and the second light emitter includes a light source having a peak wavelength below 530 nm and a color converting member provided near the light source.

6. The white light source apparatus of claim 5, wherein the light source is a light emitting diode and the light emitting diode is covered by a resin made of a color converting material containing a component absorbing a visible light component below 480 nm.

7. The white light source apparatus of claim 5, wherein the color converting member includes an optical multi-layered film or a fluorescent material.

8. The white source apparatus of claim 5, wherein each of the first and the second emitter further includes a lens provided on the color converting member, the lens including a short wavelength cutoff filter which cuts off a visible light component below 480 nm.