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US 2006/0040138 A1Published application
Method of evaluating whiteness, method of evaluating comparative whiteness, light source and luminaire
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKenji Mukai, Toshio Mori, Yoshio Manabe, Yoshinori Ootaka, Masaaki Hama
Life of this patent
Estimating the term…
Abstract
In evaluating whiteness of light from a light source or a luminaire, whiteness W is given by the following equation, W=−5.3C+100, wherein chroma C is determined by the CIE 1997 Interim Color Appearance Model (Simple Version).
Claims40
1-37. (canceled)
A light source, being characterized by:
- emitting light whose whiteness is no smaller than 65 obtained when the light is reflected from a blank surface of a newspaper, the whiteness being calculated using chroma C of the light and an equation (7),
- W=−3.3C+100 (7)
- wherein the chroma C is calculated using a method defined by the CIE 1997 Interim Color Appearance Model (Simple Version);
- emitting light whose chromaticity is, on the CIE 1931 chromaticity diagram, in a range expressed by two equations (8) and (9);
- and
- emitting light whose visual clarity index is no smaller than 110:
- y≧−2.63x2+2.63x−0.263 (8)
- y≧−3.09x+1.22 (9)
5 more elements
A light source, characterized by:
- emitting light whose whiteness W is no smaller than 65 when the light is reflected from a blank surface of a newspaper, the whiteness W being calculated using chroma C of the light and an equation (11),
- W=−3.3C+100 (11)
- wherein the chroma C is calculated using a method defined by the CIE 1997 Interim Color Appearance Model (Simple Version);
- emitting light whose chromaticity is, on the CIE 1931 chromaticity diagram, in a range expressed by two equations (12) and (13);
- and
- emitting light whose visual clarity index, is no smaller than 115:
- y≧−2.63x2+2.63x−0.263 (12)
- y≧−3.09x+1.22 (13)
5 more elements
68-75. (canceled)
A luminaire, being characterized by:
- emitting light whose whiteness is no smaller than 65 obtained when the light is reflected from a blank surface of a newspaper, the whiteness being calculated using chroma C of the light and an equation (19),
- W=−3.3C+100 (19)
- wherein the chroma C is calculated using a method defined by the CIE 1997 Interim Color Appearance Model (Simple Version);
- emitting light whose chromaticity is, on the CIE 1931 chromaticity diagram, in a range expressed by two equations (20) and (21);
- and
- emitting light whose visual clarity index is no smaller than 110:
- y≧−2.63x+2.63x −0.263 (20)
- y≧3.09x+1.22 (21)
5 more elements
A luminaire, being characterized by:
- emitting light whose whiteness W is no smaller than 65 when the light is reflected from a blank surface of a newspaper, the whiteness W being calculated using chroma C of the light and an equation (23),
- W=−3.3C+100 (23)
- wherein the chroma C is calculated using a method defined by the CIE 1997 Interim Color Appearance Model (Simple Version);
- emitting light whose chromaticity is, on the CIE 1931 chromaticity diagram, in a range expressed by two equations (24) and (25);
- and
- emitting light whose visual clarity index is no smaller than 115:
- y≧−2.63x2+2.63x−0.263 (24)
- y≧−3.09x+1.22 (25)
5 more elements
Dependencies are inferred from the claim text.