ILLUMINATION METHOD AND LIGHT-EMITTING DEVICE
First Claim
1. 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, whereinin 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 (1), (2), and (3) below;
(1) a distance DuvSSL from a black-body radiation locus as defined by ANSI C78.377 of the light measured at the position of the objects satisfies −
0.0325≦
DuvSSL≦
−
0.0075;
(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
−
2.7≦
Δ
Cn≦
18.6 (where n is a natural number from 1 to
15),an average saturation difference represented by formula (1) below satisfies formula (2) below and
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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.
-
Citations
88 Claims
-
1. 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, whereinin 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 (1), (2), and (3) below; (1) a distance DuvSSL from a black-body radiation locus as defined by ANSI C78.377 of the light measured at the position of the objects satisfies −
0.0325≦
DuvSSL≦
−
0.0075;(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
−
2.7≦
Δ
Cn≦
18.6 (where n is a natural number from 1 to
15),an average saturation difference represented by formula (1) below satisfies formula (2) below and - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
-
-
44. A light-emitting device incorporating a light-emitting element, wherein
light emitted from the light-emitting device includes, in a main radiant direction thereof, light whose distance DuvSSL from a black-body radiation locus as defined by ANSI C78.377 satisfies − - 0.0325≦
DuvSSL≦
−
0.0075, andif a spectral power distribution of light emitted from the light-emitting device in the radiant direction is denoted by φ
SSL (λ
), a spectral power distribution of a reference light that is selected according to 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 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 a reference light that is selected according to 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
) anda 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, andan index Acg represented by formula (1) below satisfies −
280≦
Acg≦
−
26
[Expression 6]
Acg=∫
380495Δ
S(λ
)dλ
+∫
495590(−
Δ
S(λ
))dλ
+S(λ
)dλ
(1). - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86)
- 0.0325≦
-
45. A light-emitting device incorporating a light-emitting element, wherein
light emitted from the light-emitting device includes, in a main radiant direction thereof, light whose distance DuvSSL from a black-body radiation locus as defined by ANSI C78.377 satisfies − - 0.0325≦
DuvSSL≦
−
0.0075, andif a spectral power distribution of light emitted from the light-emitting device in the radiant direction is denoted by φ
SSL (λ
), a spectral power distribution of a reference light that is selected according to 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 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 a reference light that is selected according to 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
), anda 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, andan index Acg represented by formula (2) below satisfies −
280≦
Acg≦
−
26
[Expression 7]
Acg=∫
380495Δ
S(λ
)dλ
+∫
495590(−
Δ
S(λ
))dλ
+∫
590780Δ
S(λ
)dλ
(2).
- 0.0325≦
-
87. A design method of a light-emitting device incorporating a light-emitting element, wherein
light emitted from the light-emitting device is configured so as to include, in a main radiant direction thereof, light whose distance DuvSSL from a black-body radiation locus as defined by ANSI C78.377 satisfies − - 0.0325≦
DuvSSL≦
−
0.0075, andif a spectral power distribution of light emitted from the light-emitting device in the radiant direction is denoted by φ
SSL (λ
), a spectral power distribution of a reference light that is selected according to 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 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 a reference light that is selected according to 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
) anda wavelength that produces a longest wavelength local maximum value of SSSL (λ
) in a wavelength range from 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, andan index Acg represented by formula (1) below satisfies −
280≦
Acg≦
−
26
[Expression 11]
Acg=∫
380495Δ
S(λ
)dλ
+∫
495590(−
Δ
S(λ
))dλ
+S(λ
)dλ
(1).
- 0.0325≦
-
88. A design method of a light-emitting device incorporating a light-emitting element, wherein
light emitted from the light-emitting device is configured so as to include, in a main radiant direction thereof, light whose distance DuvSSL from a black-body radiation locus as defined by ANSI C78.377 satisfies − - 0.0325≦
DuvSSL≦
−
0.0075, andif a spectral power distribution of light emitted from the light-emitting device in the radiant direction is denoted by φ
SSL (λ
), a spectral power distribution of a reference light that is selected according to 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 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 a reference light that is selected according to 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
) anda wavelength that produces a longest wavelength local maximum value of SSSL (λ
) in a wavelength range from 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, andan index Acg represented by formula (2) below satisfies −
280≦
Acg≦
−
26
[Expression 12]
Acg=∫
380495Δ
S(λ
)dλ
+∫
495590(−
Δ
S(λ
))dλ
+∫
590780Δ
S(λ
)dλ
(2).
- 0.0325≦
Specification