IP Library › Granted Patent US 8,592,849
Granted Patent B2
US 8,592,849 · App. 13/541,426 · Granted Nov 26, 2013

LED light source and chromaticity adjustment method for LED light source

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Quick Facts
Patent No.
US 8,592,849
App. No.
13/541,426
Granted
Nov 26, 2013
Kind
B2
Abstract

There is provided an LED light source whose chromaticity can be adjusted easily without changing its outer shape and suffering damage in the process of chromaticity adjustment. An LED light source includes an LED device, a fluorescent material that absorbs and wavelength-converts a portion of light emitted from the LED device to emit light from itself, a sealing material that includes the fluorescent material and that is disposed around the LED device, and light scattering sections that are formed at a portion of a surface of the sealing material and scatter a portion of the light emitted from the LED device for adjusting chromaticity of the LED light source, and a chromaticity adjustment method for such LED light source.

Claims (12)

1. An LED light source, comprising:

an LED device;

a fluorescent material that absorbs and wavelength-converts a portion of light emitted from said LED device to emit light from itself;

a sealing material that includes said fluorescent material and that is disposed around said LED device; and

light scattering sections that are formed at a portion of a surface of said sealing material and scatter a portion of the light emitted from said LED device for adjusting chromaticity of said LED light source,

wherein said light scattering sections are formed in a region within a critical angle so as to adjust chromaticity of the light emitted from said LED light source.

2. The LED light source according to claim 1 ,

wherein said light scattering sections include projections and depressions formed as dots.

3. The LED light Source according to claim 1 , wherein said light scattering sections include projections and depressions formed in the form of lines.

4. The LED light source according to claim 1 , wherein said light scattering sections include projections and depressions formed in the form of planes.

5. The LED light source according to claim 1 , wherein said LED device emits blue light and said fluorescent material absorbs the blue light and emits yellow light so that said LED light source emits pseudo white light,

wherein said light scattering sections adjust chromaticity of the pseudo white light emitted from said LED light source toward the yellow side.

Assignments (1)
CHANGE OF NAME Recorded Jan 25, 2017
From: CITIZEN HOLDINGS CO., LTD.
To: CITIZEN WATCH CO., LTD.
Reel/Frame 041479/0804 →