Illumination method and light-emitting device
First Claim
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1. A light-emitting device comprising at least a semiconductor light-emitting element as a light-emitting element, whereinthe light-emitting device includes a light-emitting element which has a peak within a short wavelength range from 380 nm to 495 nm, a light-emitting element which has a peak within an intermediate wavelength range from 495 nm to 590 nm, and a light-emitting element which has a peak within a long wavelength range from 590 nm to 780 nm,the light-emitting device includes at least one each of the light-emitting elements in said respective wavelength ranges,the light-emitting device includes two or more of the light-emitting elements in at least one selected from said wavelength ranges,the light emitted from the light-emitting device in the radiant direction satisfies (1)′
- and (2) below;
(1)′
if an a* value and a b* value in CIE 1976 L*a*b* color space of 15 Munsell renotation color samples from #01 to #15 listed below when mathematically assuming illumination by the light emitted from the light-emitting device in the radiant direction are respectively denoted by a*nSSL and b*nSSL (where n is a natural number from 1 to
15), andan a* value and a b* value in CIE 1976 L*a*b* color space of the 15 Munsell renotation color samples when mathematically assuming illumination by a reference light that is selected according to a correlated color temperature TSSL (K) of the light emitted from the light-emitting device in the radiant direction are respectively denoted by a*nref and b*nref (where n is a natural number from 1 to
15), then each saturation difference Δ
Cn satisfies
−
3.8≤
Δ
Cn≤
18.6 (where n is a natural number from 1 to
15);
if a maximum saturation difference value is denoted by Δ
Cmax and a minimum saturation difference value is denoted by Δ
Cmin, then a difference |Δ
Cmax−
Δ
Cmin| between the maximum saturation difference value and the minimum saturation difference value satisfies
2.8≤
|Δ
Cmax−
Δ
Cmin|≤
19.6,
where Δ
Cn=√
{(a*nSSL)2+(b*nSSL)2}−
√
{(a*nref)2+(b*nref)2}with the 15 Munsell renotation color samples being;
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Abstract
To provide an illumination method and a light-emitting device which are capable of achieving, under an indoor illumination environment where illuminance is around 5000 lx or lower when performing detailed work and generally around 1500 lx or lower, a color appearance or an object appearance as perceived by a person, will be as natural, vivid, highly visible, and comfortable as though perceived outdoors in a high-illuminance environment, regardless of scores of various color rendition metric. Light emitted from the light-emitting device illuminates an object such that light measured at a position of the object satisfies specific requirements. A feature of the light-emitting device is that light emitted by the light-emitting device in a main radiant direction satisfies specific requirements.
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Citations
11 Claims
-
1. A light-emitting device comprising at least a semiconductor light-emitting element as a light-emitting element, wherein
the light-emitting device includes a light-emitting element which has a peak within a short wavelength range from 380 nm to 495 nm, a light-emitting element which has a peak within an intermediate wavelength range from 495 nm to 590 nm, and a light-emitting element which has a peak within a long wavelength range from 590 nm to 780 nm, the light-emitting device includes at least one each of the light-emitting elements in said respective wavelength ranges, the light-emitting device includes two or more of the light-emitting elements in at least one selected from said wavelength ranges, the light emitted from the light-emitting device in the radiant direction satisfies (1)′ - and (2) below;
(1)′
if an a* value and a b* value in CIE 1976 L*a*b* color space of 15 Munsell renotation color samples from #01 to #15 listed below when mathematically assuming illumination by the light emitted from the light-emitting device in the radiant direction are respectively denoted by a*nSSL and b*nSSL (where n is a natural number from 1 to
15), andan a* value and a b* value in CIE 1976 L*a*b* color space of the 15 Munsell renotation color samples when mathematically assuming illumination by a reference light that is selected according to a correlated color temperature TSSL (K) of the light emitted from the light-emitting device in the radiant direction are respectively denoted by a*nref and b*nref (where n is a natural number from 1 to
15), then each saturation difference Δ
Cn satisfies
−
3.8≤
Δ
Cn≤
18.6 (where n is a natural number from 1 to
15);if a maximum saturation difference value is denoted by Δ
Cmax and a minimum saturation difference value is denoted by Δ
Cmin, then a difference |Δ
Cmax−
Δ
Cmin| between the maximum saturation difference value and the minimum saturation difference value satisfies
2.8≤
|Δ
Cmax−
Δ
Cmin|≤
19.6,
where Δ
Cn=√
{(a*nSSL)2+(b*nSSL)2}−
√
{(a*nref)2+(b*nref)2}with the 15 Munsell renotation color samples being; - View Dependent Claims (2, 3, 4, 5)
- and (2) below;
-
6. A light-emitting device comprising at least a semiconductor light-emitting element as a light-emitting element, wherein
the light-emitting device includes a light-emitting element which has a peak within a short wavelength range from 380 nm to 495 nm, a light-emitting element which has a peak within an intermediate wavelength range from 495 nm to 590 nm, and a light-emitting element which has a peak within a long wavelength range from 590 nm to 780 nm, the light-emitting device includes at least one each of the light-emitting elements in said respective wavelength ranges, the light-emitting device includes two or more of the light-emitting elements in at least one selected from said wavelength ranges, if a spectral power distribution of light emitted from the light-emitting device in a radiant direction is denoted by φ -
SSL (λ
), a spectral power distribution of a reference light that is selected according to a correlated color temperature TSSL (K) of the light emitted from the light-emitting device in the radiant direction is denoted by φ
ref(λ
), tristimulus values of the light emitted from the light-emitting device in the radiant direction are denoted by (XSSL, YSSL, ZSSL), and tristimulus values of the reference light that is selected according to the correlated color temperature TSSL (K) of the light emitted from the light-emitting device in the radiant direction are denoted by (Xref, Yref, Zref), andif a normalized spectral power distribution SSSL (λ
) of light emitted from the light-emitting device in the radiant direction, a normalized spectral power distribution Sref (λ
) of reference light that is selected according to the correlated color temperature TSSL (K) of the light emitted from the light-emitting device in the radiant direction, and a difference Δ
S (λ
) between these normalized spectral power distributions are respectively defined as
SSSL(λ
)=φ
SSL(λ
)/YSSL,
Sref(λ
)=φ
ref(λ
)/Yref and
Δ
S (λ
)=Sref(λ
)−
SSSL(λ
), andin a case where a wavelength that produces a longest wavelength local maximum value of SSSL (λ
) in a wavelength range of 380 nm to 780 nm is denoted by λ
R (nm), then a wavelength Λ
4 that assumes SSSL (λ
R)/2 exists on a longer wavelength-side of λ
R,an index Acg represented by formula (3) below satisfies −
360≤
Acg≤
−
10,
Acg=∫
380495Δ
S(λ
)dλ
+∫
495590(−
Δ
S(λ
))dλ
+∫
590Λ
4Δ
S(λ
)dλ
(3)in a case where a wavelength that produces a longest wavelength local maximum value of SSSL (λ
) in a wavelength range of 380 nm to 780 nm is denoted by λ
R (nm), then a wavelength Λ
4 that assumes SSSL (λ
R)/2 does not exist on a longer wavelength-side of λ
R,an index Acg represented by formula (4) below satisfies −
360≤
Acg≤
−
10
Acg=∫
380495Δ
S(λ
)dλ
+∫
495590(−
Δ
S(λ
))dλ
+∫
590780Δ
S(λ
)dλ
(4). - View Dependent Claims (7, 8, 9)
-
SSL (λ
-
10. An illumination method comprising:
- illuminated objects preparation step of preparing illuminated objects; and
an illumination step of illuminating the objects by light emitted from light-emitting devices including a semiconductor light-emitting element that is a light-emitting element, whereinthe light-emitting device includes a light-emitting element which has a peak within a short wavelength range from 380 nm to 495 nm, a light-emitting element which has a peak within an intermediate wavelength range from 495 nm to 590 nm, and a light-emitting element which has a peak within a long wavelength range from 590 nm to 780 nm, the light-emitting device includes at least one each of the light-emitting elements in said respective wavelength ranges, the light-emitting device includes two or more of the light-emitting elements in at least one selected from said wavelength ranges, in the illumination step, when light emitted from the light-emitting devices illuminate the objects, the objects are illuminated so that the light measured at a position of the objects satisfies (2)′ and
(3) below;(2)′
if an a* value and a b* value in CIE 1976 L*a*b* color space of 15 Munsell renotation color samples from #01 to #15 listed below when mathematically assuming illumination by the light measured at the position of the objects are respectively denoted by a*nSSL and b*nSSL (where n is a natural number from 1 to
15), andif an a* value and a b* value in CIE 1976 L*a*b* color space of the 15 Munsell renotation color samples when mathematically assuming illumination by a reference light that is selected according to a correlated color temperature TSSL (K) of the light measured at the position of the objects are respectively denoted by a*nref and b*nref (where n is a natural number from 1 to
15), then each saturation difference Δ
Cn satisfies
−
3.8≤
Δ
Cn≤
18.6 (where n is a natural number from 1 to
15),if a maximum saturation difference value is denoted by Δ
Cmax and a minimum saturation difference value is denoted by Δ
Cmin, then a difference |Δ
Cmax−
Δ
Cmin| between the maximum saturation difference value and the minimum saturation difference value satisfies
2.8≤
|Δ
Cmax−
Δ
Cmin|≤
19.6,
where Δ
Cn=√
{(a*nSSL)2+(b*nSSL)2}−
√
{(a*nref)2+(b*nref)2}with the 15 Munsell renotation color samples being; - View Dependent Claims (11)
- illuminated objects preparation step of preparing illuminated objects; and
Specification
-
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Current AssigneeCitizen Electronics Company Limited
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Original AssigneeCitizen Electronics Company Limited
-
InventorsHorie, Hideyoshi
-
Primary Examiner(s)Mehta, Ratisha
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Application NumberUS15/494,664Publication NumberTime in Patent Office365 DaysField of SearchUS Class CurrentCPC Class CodesC09K 11/08 containing inorganic lumine...H01L 2924/00 Indexing scheme for arrange...H01L 2924/0002 Not covered by any one of g...H01L 33/30 containing only elements of...H01L 33/32 containing nitrogenH01L 33/48 characterised by the semico...H01L 33/50 Wavelength conversion elementsH01L 33/502 Wavelength conversion mater...H01L 33/504 Elements with two or more w...H05B 45/20 Controlling the colour of t...H05B 45/22 using optical feedbackH05B 45/24 using electrical feedback f...
