US 11,231,359 B2Granted

Multi-angle colorimeter

AssigneeKonica Minolta, Inc.

InventorsYoshitaka Teraoka, Tomomi Setoguchi

Life of this patent

Estimating the term…

Abstract

A multi-angle colorimeter includes an index calculation unit that calculates, based on a predetermined calculation formula, an index corresponding to luminance of a glittering material used in metallic coating or pearl coating by using optical parameters for color evaluation of the metallic coating or pearl coating on a surface of an object.

Claims20

Dependent claims

A multi-angle colorimeter, comprising:

a light emitter that emits light onto an object;
a light amount detection unit that receives the light emitted from the light emitter and reflected by the object in a plurality of directions of angles, and detects a reflected light amount in each of the angles;
and
a hardware processor that obtains optical parameters, which are used in color evaluation of metallic coating or pearl coating on a surface of the object, based on the reflected light amount, and calculates, using the optical parameters, an index corresponding to luminance of a glittering material used in the metallic coating or the pearl coating, wherein
the hardware processor calculates an index I expressed by a following equation, as the index corresponding to the luminance of the glittering material,
when
the specular reflection direction is 0° in a plane including an incident direction and a specular reflection direction of a principal light beam of the light emitted from the light emitter with respect to the object, and an angle direction inclined from the specular reflection direction toward the incident direction is defined as a positive direction,
n is an integer equal to or greater than 2,
the plurality of angles are respectively set to θ1 to θn, in which the angles θ1 to θn are angles within a range of −15° to 45° respectively,
the optical parameters obtained for direction of respective angles θ1 to θn based on the reflected light amount are I(θ1) to I(θn) respectively, and
weighting coefficients of the respective optical parameters I(θ1) to I(θn) are a1 to an respectively,
I=a1·I(θ1)+a2·I(θ2)+ . . . +an·I(θn)
where
regarding the weighting coefficients a1 to an, one is positive, another is negative, and rest is positive, negative, or zero.

11 more elements

A multi-angle colorimeter comprising:

a light emitter that emits light onto an object;
a light amount detection unit that receives the light emitted from the light emitter and reflected by the object in a plurality of directions of angles, and detects a reflected light amount in each of the angles;
and
a hardware processor that obtains optical parameters, which is used in color evaluation of metallic coating or pearl coating on a surface of the object, based on the reflected light amount, and calculates, using the optical parameters, an index corresponding to luminance of a glittering material used in the metallic coating or the pearl coating, wherein
the hardware processor calculates an index I expressed by a following equation, as the index corresponding to the luminance of the glittering material,
when
the specular reflection direction is 0° in a plane including an incident direction and a specular reflection direction of a principal light beam of the light emitted from the light emitter with respect to the object, and an angle direction inclined from the specular reflection direction toward the incident direction is defined as a positive direction,
n and m are respectively an integer equal to or greater than 2,
the plurality of angles are respectively set to θ1 to θn, in which the angles θ1 to θn are angles within a range of −15° to 45° respectively,
the optical parameters obtained for direction of respective angles θ1 to θn based on the reflected light amount are I′1(θ) to I′1(θn), I′2(θ1) to I′2(θn), . . . , I′m(θ1) to l′m(θn) for each different wavelength band or each different wavelength, respectively, and
weighting coefficients of the respective optical parameters I′1(θ1) to I′1(θn), I′2(θ1) to I′2(θn), . . . , I'm(θ1) to I′m(θn) are a1 to an respectively,
I
1
=
a
1
·
I
1
′
⁡
(
θ
1
)
+
a
2
·
I
1
′
⁡
(
θ
2
)
+
…
+
a
n
·
I
1
′
⁡
(
θ
n
)
I
2
=
a
1
·
I
2
′
⁡
(
θ
1
)
+
a
2
·
I
2
′
⁡
(
θ
2
)
+
…
+
a
n
·
I
2
′
⁡
(
θ
n
)
…
I
m
=
a
1
·
I
m
′
⁡
(
θ
1
)
+
a
2
·
I
m
′
⁡
(
θ
2
)
+
…
+
a
n
·
I
m
′
⁡
(
θ
n
)
I
=
I
1
+
I
2
+
…
+
I
m
where
regarding the weighting coefficients a1 to an, one is positive, another is negative, and rest is positive, negative, or zero.

143 more elements

A multi-angle colorimeter comprising:

a light emitter that emits light onto an object;
a light amount detection unit that receives the light emitted from the light emitter and reflected by the object in a plurality of directions of angles, and detects a reflected light amount in each of the angles;
and
a hardware processor that obtains optical parameters, which is used in color evaluation of metallic coating or pearl coating on a surface of the object, based on the reflected light amount, and calculates, using the optical parameters, an index corresponding to luminance of a glittering material used in the metallic coating or the pearl coating, wherein
the hardware processor calculates an index I expressed by a following equation, as the index corresponding to the luminance of the glittering material,
when
the specular reflection direction is 0° in a plane including an incident direction and a specular reflection direction of a principal light beam of the light emitted from the light emitter with respect to the object, and an angle direction inclined from the specular reflection direction toward the incident direction is defined as a positive direction,
n and m are respectively an integer equal to or greater than 2,
the plurality of angles are respectively set to θ1 to θn, in which the angles θ1 to θn are angles within a range of −15° to 45° respectively,
the optical parameters obtained for direction of respective angles θ1 to θn based on the reflected light amount are two types of J(θ) and K(θ) where at least one of J(θ) and K(θ) has wavelength dependency,
J(θ)=J1(θ1) to J1(θn), J2(θ1) to J2(θn), . . . Jm(θ1) to Jm(θn),
K(θ)=K1(θP),K2(θP),K3(θP), . . . ,Km(θP), where P is an integer of any one of 1 to n, and
the weighting coefficients of the respective optical parameters J(θ) are respectively two types of a1 to an and b1 to bn,
I
1
=
[
{
a
1
·
J
1
⁡
(
θ
1
)
+
a
2
·
J
1
⁡
(
θ
2
)
+
⁢
…
+
a
n
·
J
1
⁡
(
θ
n
)
}
/
{
b
1
·
J
1
⁡
(
θ
1
)
+
b
2
·
J
1
⁡
(
θ
2
)
+
…
⁢
+
b
n
·
J
1
⁡
(
θ
n
)
}
]
·
K
1
⁡
(
θ
P
)
⁢
⁢
I
2
=
[
{
a
1
·
J
2
⁡
(
θ
1
)
+
a
2
·
J
2
⁡
(
θ
2
)
+
⁢
…
+
a
n
·
J
2
⁡
(
θ
n
)
}
/
{
b
1
·
J
2
⁡
(
θ
1
)
+
b
2
·
J
2
⁡
(
θ
2
)
+
…
⁢
+
b
n
·
J
2
⁢
(
θ
n
)
}
]
·
K
2
⁡
(
θ
P
)
⁢
…
I
m
=
[
{
a
1
·
J
m
⁡
(
θ
1
)
+
a
2
·
J
m
⁡
(
θ
2
)
+
⁢
…
+
a
n
·
J
m
⁢
(
θ
n
)
}
/
{
b
1
·
J
m
⁡
(
θ
1
)
+
b
2
·
J
m
⁡
(
θ
2
)
+
…
⁢
+
b
n
·
J
m
⁡
(
θ
n
)
}
]
·
K
m
⁡
(
θ
P
)
⁢
I
=
I
1
+
I
2
+
…
⁢
+
I
m
where
regarding the weighting coefficients a1 to an, one is positive, another is negative, and rest is positive, negative, or zero, and
each of the weighting coefficients b1 to bn is any of positive, negative, and zero, except a case where all are zero.

295 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/764,188Filed 11 Sep 2018
Priority: JP JP2017-22101316 Nov 2017
Published: US 2020/0378887 A13 Dec 2020
Granted: 25 Jan 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G01N 21/251
Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands:…
G01N 21/255
Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands: details,…
G01J 3/50
Measurement of colour; Colour measuring devices, e.g. colorimeters: using electric radiation detectors
G01N 21/55
Systems in which incident light is modified in accordance with the properties of the material investigated: specular reflectivity

Family

US 2020/0378887 A1Pre-grant publication · published 3 Dec 2020
US 11,231,359 B2This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

Citations

Open elsewhere

patentgrep

Loading patent…

Abstract

Facts

Application

16/764,188Filed 11 Sep 2018

Priority

JP JP2017-22101316 Nov 2017

Published

US 2020/0378887 A13 Dec 2020

Granted

25 Jan 2022

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

G01N 21/251
Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands:…
G01N 21/255
Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands: details,…
G01J 3/50
Measurement of colour; Colour measuring devices, e.g. colorimeters: using electric radiation detectors
G01N 21/55
Systems in which incident light is modified in accordance with the properties of the material investigated: specular reflectivity