WO2016208456A1 - マルチアングル測色計 - Google Patents
マルチアングル測色計 Download PDFInfo
- Publication number
- WO2016208456A1 WO2016208456A1 PCT/JP2016/067660 JP2016067660W WO2016208456A1 WO 2016208456 A1 WO2016208456 A1 WO 2016208456A1 JP 2016067660 W JP2016067660 W JP 2016067660W WO 2016208456 A1 WO2016208456 A1 WO 2016208456A1
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- measurement
- light
- light receiving
- illumination light
- reflected light
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- 238000005259 measurement Methods 0.000 claims abstract description 281
- 238000005286 illumination Methods 0.000 claims abstract description 224
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- 238000012544 monitoring process Methods 0.000 claims description 23
- 238000004737 colorimetric analysis Methods 0.000 claims description 16
- 238000004364 calculation method Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 4
- 238000004611 spectroscopical analysis Methods 0.000 abstract description 4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/08—Beam switching arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/30—Measuring the intensity of spectral lines directly on the spectrum itself
- G01J3/36—Investigating two or more bands of a spectrum by separate detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
- G01J3/501—Colorimeters using spectrally-selective light sources, e.g. LEDs
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
- G01J3/504—Goniometric colour measurements, for example measurements of metallic or flake based paints
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
- G01J2003/102—Plural sources
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
- G01J3/26—Generating the spectrum; Monochromators using multiple reflection, e.g. Fabry-Perot interferometer, variable interference filters
Definitions
- the present invention relates to a multi-angle colorimeter.
- Multi-angle colorimeters are roughly classified into one-way illumination / multi-directional light receiving type and multi-directional illumination / one-way light receiving type.
- a unidirectional illumination / multidirectional light-receiving type multi-angle colorimeter a sample is illuminated from one direction, and reflected light from the sample is received from multiple directions.
- color measurement is performed for each of a plurality of light receiving angles.
- a multi-angle illumination / unidirectional light-receiving type multi-angle colorimeter a sample is illuminated from multiple directions, and reflected light from the sample is received from one direction.
- the multi-angle colorimeter is suitable for performing color measurement on a sample whose observed color changes depending on the observed direction.
- Examples of the sample whose color changes depending on the observed direction include an automobile body or the like that has been subjected to metallic coating or pearl coating.
- the color measurement is performed in a state where the reference axis of the multi-angle colorimeter coincides with the normal line of the color measurement area of the sample.
- the measured color area includes a curved surface such as a bumper of an automobile
- the color measurement results are affected by the inclination of the reference line from the normal of the measured color area, if the reference axis is inclined from the normal of the measured color area, an accurate color measurement result cannot be obtained. .
- the invention described in the detailed description of the invention is made to solve this problem.
- the problem to be solved by the invention described in the detailed description of the invention is that, in addition to suppressing the influence of the inclination of the reference axis from the normal of the color measurement area on the color measurement result, camera shake is measured. The effect on color results is suppressed.
- the multi-angle colorimeter includes an illumination light receiving optical system, a measurement mechanism, and a measurement control mechanism.
- the illumination light receiving optical system has a plurality of radiation positions and a plurality of light receiving positions.
- the plurality of radiation positions are arranged symmetrically with respect to a reference axis passing through the position to be measured.
- the plurality of light receiving positions are arranged symmetrically with respect to the reference axis.
- the illumination light receiving optical system emits illumination light from each of the plurality of radiation positions toward the measurement position, and receives reflected light from the measurement position to each of the plurality of light reception positions.
- the plurality of radiation positions and the plurality of light receiving positions are arranged so that the illumination light can be emitted and the reflected light can be received according to each of a plurality of geometric conditions.
- the measurement mechanism performs measurement for colorimetry on the reflected light received by the illumination light receiving optical system, and outputs the measurement result for colorimetry.
- the first measurement operation and the second measurement operation are performed while maintaining the geometric conditions for each of a plurality of geometric conditions.
- the illumination light receiving optical system radiates illumination light from the first radiation position to the measurement position, receives reflected light from the measurement position to the first light reception position, and measures the measurement mechanism.
- the measurement for colorimetry is performed on the reflected light from the measurement position to the first light receiving position, and the measurement result for colorimetry is output.
- the illumination light receiving optical system emits illumination light from the second radiation position to the measurement position, receives reflected light from the measurement position to the second light reception position, and measures the measurement mechanism.
- the measurement for colorimetry is performed on the reflected light traveling from the measurement position to the second light receiving position, and the measurement result for colorimetry is output.
- Measured color measurement results corrected based on the average of the two color measurement results are obtained.
- Each of the first radiation position and the second radiation position is one of a plurality of radiation positions.
- Each of the first light receiving position and the second light receiving position is one of a plurality of light receiving positions.
- the second radiation position and the second light receiving position are respectively symmetrical with the first radiation position and the first light receiving position with respect to the reference axis.
- FIG. 1 Outline of Multi-angle Colorimeter
- FIG. 1 is a perspective view showing the appearance.
- the schematic diagram of FIG. 2 shows a multi-angle colorimeter and a sample.
- FIG. 2 is a block diagram.
- the schematic diagram of FIG. 3 shows a main part, a housing, and a sample of the illumination light receiving optical system.
- the schematic diagram of FIG. 4 shows a spectroscopic block. Each of FIGS. 3 and 4 shows a cross section.
- the multi-angle colorimeter 100 of this embodiment includes an illumination light receiving optical system 103, a spectral block 104, a control unit 105, an operation display unit 106, a storage unit 107, and a housing 108.
- the control unit 105 includes a measurement control unit 111 and a calculation unit 112.
- the multi-angle colorimeter 100 is a unidirectional illumination / multidirectional light receiving type, illuminates the sample S from one direction, and receives reflected light from the sample S from multiple directions. Thereby, color measurement is performed for each of the plurality of light receiving angles, and appropriate color measurement is performed on the sample S in which the observed color changes depending on the observed direction.
- the pressing portion 115 of the housing 108 is pressed against the sample S.
- the opening 118 formed in the housing 108 faces the sample S, and the measurement position 121 is arranged on the surface of the sample S.
- the measurement position 121 is arranged on the surface of the sample S, the surface of the sample S can be measured.
- the measurement control unit 111 controls the illumination light receiving optical system 103 and the spectroscopic block 104, and the illumination light receiving optical system 103 illuminates the sample S and receives the reflected light from the sample S.
- the block 104 performs spectroscopic measurement on the reflected light and outputs the result of the spectroscopic measurement, the calculation unit 112 calculates the colorimetric value from the spectroscopic measurement result, and the operation display unit 106 displays the colorimetric value.
- FIG. 5 shows a housing and a sample.
- FIG. 5 is a cross-sectional view.
- the pressing portion 115 of the casing 108 is pressed against the sample S so that the opening 118 formed in the casing 108 faces the sample S, and the sample Color measurement is performed on the measured color region 129 facing the opening 118 in the surface of S.
- the pressing of the pressing unit 115 to the sample S is preferably performed so that the reference axis 132 coincides with the normal line 135 of the measured color region 129 as shown in FIG.
- the normal line 135 is a normal line of the measured color area 129 at the intersection 136 between the reference axis 132 and the measured color area 129.
- the measured color region 129 has a curved surface such as a bumper of an automobile, it is difficult to accurately match the reference axis 132 with the normal line 135. As shown in FIG. It tends to tilt from line 135.
- 7 and 9 each show a simplified illumination light receiving optical system and sample.
- the graphs of FIGS. 8 and 10 show the relationship between the angle and the intensity of the reflected light.
- 7 and 8 show a case where the reference axis coincides with the normal line of the measured color region.
- 9 and 10 show a case where the reference axis is tilted from the normal line of the measured color region.
- the angle indicates the inclination from the normal line of the measured color area, takes a positive value when it is inclined clockwise from the normal line of the measured color area around the measured position, and is measured from the reference axis. It takes a negative value when it is tilted counterclockwise around the position.
- the radiation positions 10a and 10b are respectively arranged on virtual lines inclined by angles + ⁇ and ⁇ from the normal line 14, respectively.
- the light receiving positions 11a and 11b are arranged on imaginary lines that are inclined from the normal line 14 by angles + ( ⁇ + ⁇ ) and ⁇ ( ⁇ + ⁇ ), respectively. From the radiation positions 10a and 10b, illumination lights 16a and 16b toward the measurement position 15 are emitted, respectively. At the light receiving positions 11a and 11b, the reflected lights 17a and 17b coming from the measurement position 15 are received, respectively.
- the illumination light 16a When the illumination light 16a is emitted from the radiation position 10a, the illumination light 16a is reflected at the measurement position 15 to generate reflected lights 17a and 17b.
- the illumination light 16b When the illumination light 16b is radiated from the radiation position 10b, reflected light 17a and 17b are generated by the illumination light 16b being reflected at the measurement position 15.
- the optical path of the illumination light 16b is symmetric with respect to the optical path of the illumination light 16a with respect to the reference axis 12.
- the optical path of the reflected light 17b is symmetric with respect to the optical path of the reflected light 17a with respect to the reference axis 12.
- the angular distribution of the intensity of reflected light including regular reflected light and diffuse reflected light is the sum of the following three components [i], [ii], and [iii].
- [Iii] A component that decays away from the angle of the normal 14 and can be approximated by a cosine function.
- component [i] is large at an angle relatively close to the angle of the optical path of specular reflection light, and the contribution of component [iii] is large at an angle relatively far from the angle of the optical path of specular reflection light.
- the intensity of the reflected light generated when the illumination light 16a is reflected at the measurement position 15 using the angle A of the optical path of the reflected light is R.
- the intensity of the reflected light generated when the illumination light 16b is reflected at the measurement position 15 is approximately expressed as R (A ⁇ ).
- the radiation positions 10a and 10b are tilted from the normal 14 by angles + ( ⁇ ) and ⁇ ( ⁇ + ⁇ ), as shown in FIG.
- the light receiving positions 11a and 11b are respectively arranged on virtual lines inclined by angles + ( ⁇ + ⁇ ) and ⁇ ( ⁇ + ⁇ + ⁇ ) from the normal line 14, respectively.
- the intensity of the reflected light generated when the illumination light 16a is reflected at the measurement position 15 is approximately R (A + ( ⁇ )).
- the intensity of the reflected light generated when the illumination light 16b is reflected at the measurement position 15 is approximately expressed as R (A ⁇ ( ⁇ + ⁇ )).
- R (+ ⁇ 2 ⁇ ) of the reflected light 17a in the hatched angle region 19a in FIG. 10 and the intensity R ( ⁇ 2 ⁇ ) of the reflected light 17b in the angled region 19b hatched in FIG. Has the relationship R (+ ⁇ 2 ⁇ ) ⁇ R ( ⁇ 2 ⁇ ).
- the intensity of the reflected light obtained by the inclination of the reference axis 12 from the normal line 14 changes. Therefore, accurate colorimetric results cannot be obtained.
- the reference from the normal line 14 is used. Since the intensity of the reflected light corrected by the inclination of the axis 12 does not change, an accurate colorimetric result can be obtained from the corrected intensity of the reflected light.
- Double-pass correction is also performed when the multi-angle colorimeter is a multi-directional illumination / one-way light receiving type.
- the illumination light receiving optical system 103 includes an illumination mechanism 138 as shown in FIG.
- the illumination mechanism 138 includes illumination units 142j and 142k.
- the illumination unit 142j includes a light emitting circuit 145j, a radiation mechanism 146j, and a beam splitter 147j.
- the illumination unit 142k includes a light emitting circuit 145k, a radiation mechanism 146k, and a beam splitter 147k.
- the radiation mechanism 146j includes a light emitting diode 150j and a collimator lens 152j.
- the radiation mechanism 146k includes a light emitting diode 150k and a collimating lens 152k.
- the measurement control unit 111 controls the light emitting circuit 145j so that power is supplied from the light emitting circuit 145j to the radiation mechanism 146j, and the power supplied to the radiation mechanism 146j emits light. It is supplied to the diode 150j.
- the light-emitting diode 150j supplied with power emits illumination light 124j.
- the illumination light 124j is radiated
- the emitted illumination light 124j is collimated by the collimating lens 152j.
- Part of the collimated illumination light 124 j passes through the beam splitter 147 j and travels toward the measurement position 121.
- a part of the collimated illumination light 124j is reflected by the beam splitter 147j, branches from the illumination light 124j toward the measurement position 15, and becomes the illumination light 126j for monitoring.
- the measurement control unit 111 controls the light emission circuit 145k so that power is supplied from the light emission circuit 145k to the emission mechanism 146k, and the electric power supplied to the emission mechanism 146k emits light. It is supplied to the diode 150k.
- the light-emitting diode 150k to which power is supplied emits illumination light 124k. Thereby, the illumination light 124k is radiated
- the emitted illumination light 124k is collimated by the collimating lens 152k.
- a part of the collimated illumination light 124 k passes through the beam splitter 147 k and travels toward the measurement position 121.
- a part of the collimated illumination light 124k is reflected by the beam splitter 147k, branches off from 124k toward the measurement position 121, and becomes the illumination light 126k for monitoring.
- Radiation position is a position that defines the illumination angle of illumination light. For this reason, when the illumination light passes through the bending optical system, the radiation position is the position where the illumination light is emitted from the bending optical system, not the position where the light source is disposed.
- the configuration of the illumination mechanism 138 may be changed.
- the light emitting circuits 145j and 145k may be omitted, and the measurement control unit 111 may directly supply power to the light emitting diodes 150j and 150k.
- the light emitting diodes 150j and 150k have the advantage that they can be turned on and off in a short time. This advantage contributes to completing the double pass correction described later in a short time.
- the light emitting diodes 150j and 150k may be replaced with other types of light sources.
- the light emitting diodes 150j and 150k may be replaced with xenon flash lamps.
- the illumination light receiving optical system 103 further includes a light receiving mechanism 139 as shown in FIG.
- the light receiving mechanism 139 includes a lens group 155 and a light guide mechanism 156.
- the lens group 155 includes lenses 159a, 159b, 159c, 159d, 159e, 159f, 159g, 159h, 159i, 159j and 159k.
- the light guide mechanism 156 includes optical fibers 160a, 160b, 160c, 160d, 160e, 160f, 160g, 160h, 160i, 160j, and 160k.
- Optical fibers 160a, 160b, 160c, 160d, 160e, 160f, 160g, 160h, 160i, 160j and 160k have incident ports 163a, 163b, 163c, 163d, 163e, 163f, 163g, 163h, 163i, 163j and 163k, respectively.
- the reflected lights 125a, 125b, 125c, 125d, 125e, 125f, 125g, 125h, and 125i are generated when the illumination light 124j or 124k is reflected at the measurement position 121, and the incident positions 163a, 163b, 163c, 163d, 163e, 163f, 163g, 163h, and 163i, respectively, are converged to lenses 159a, 159b, 159c, 159d, 159e, 159f, 159g, 159h, and 159i on the way.
- the converged reflected lights 125a, 125b, 125c, 125d, 125e, 125f, 125g, 125h and 125i are light receiving positions at which the entrances 163a, 163b, 163c, 163d, 163e, 163f, 163g, 163h and 163i are arranged. Are respectively received and input to the entrances 163a, 163b, 163c, 163d, 163e, 163f, 163g, 163h and 163i, respectively.
- the incident reflected lights 125a, 125b, 125c, 125d, 125e, 125f, 125g, 125h, and 125i are guided to the exit ports 164a, 164b, 164c, 164d, 164e, 164f, 164g, 164h, and 164i, respectively.
- the guided reflected lights 125a, 125b, 125c, 125d, 125e, 125f, 125g, 125h, and 125i are emitted from the emission ports 164a, 164b, 164c, 164d, 164e, 164f, 164g, 164h, and 164i, respectively.
- the illumination light 126j for monitoring is generated when the illumination light 124j is reflected by the beam splitter 147j, travels from the beam splitter 147j to the entrance 163j, and is converged on the lens 159j along the way.
- the converged illumination light 126j for monitoring is received at the light receiving position where the incident port 163j is disposed, and enters the incident port 163j.
- the incident monitor illumination light 126j is guided to the exit 164j.
- the guided illumination light 126j is emitted from the emission port 164j.
- the illumination light 126k for monitoring is generated when the illumination light 124k is reflected by the beam splitter 147k, travels from the beam splitter 147k to the entrance 163k, and is converged on the lens 159k along the way.
- the converged illumination light 126k for monitoring is received at the light receiving position where the entrance 163k is disposed, and enters the entrance 163k.
- the incident monitor illumination light 126k is guided to the exit 164k.
- the guided illumination light 126k is emitted from the emission port 164k.
- the light receiving position is a position that defines the light receiving angle of the reflected light. For this reason, when the reflected light passes through the bending optical system, the position where the reflected light is incident on the bending optical system is not the position where the incident port is disposed.
- the configuration of the light receiving mechanism 139 may be changed.
- a part or all of the light guide by the optical fibers 160a, 160b, 160c, 160d, 160e, 160f, 160g, 160h, 160i, 160j, and 160k may be replaced with the light guide by an optical element other than the optical fiber such as a mirror. .
- the spectroscopic block 104 includes a switching mechanism 167 and a spectroscopic measurement mechanism 168 as shown in FIG.
- the switching mechanism 167 does not block light belonging to a candidate selected from a plurality of candidates related to light to be subjected to spectroscopic measurement, and blocks light not belonging to a candidate selected from the plurality of candidates.
- the switching mechanism 167 can switch a candidate selected from a plurality of candidates.
- the first candidate includes the monitor illumination light 126j emitted from the emission port 164j.
- the illumination light 126k for monitoring that exits from the exit 164k belongs to the second candidate.
- the third candidate includes the reflected light 125e emitted from the emission port 164e.
- the fourth candidate includes the reflected light 125f emitted from the emission port 164f.
- the fifth candidate includes reflected lights 125f and 125h that are emitted from the emission ports 164f and 164h, respectively.
- the sixth candidate includes the reflected lights 125e and 125g emitted from the emission ports 164e and 164g, respectively.
- the seventh candidate includes the reflected light 125i emitted from the emission port 164i.
- the eighth candidate includes the reflected light 125c emitted from the emission port 164c.
- the ninth candidate includes the reflected light 125d emitted from the emission port 164d.
- the tenth candidate includes the reflected light 125c emitted from the emission port 164c.
- the eleventh candidate includes the reflected light 125b emitted from the emission port 164b.
- the reflected light 125a emitted from the emission port 164a belongs to the twelfth candidate.
- the spectroscopic measurement mechanism 168 performs spectroscopic measurement on the illumination light or reflected light for monitoring that is not blocked by the switching mechanism 167, and outputs the spectroscopic measurement result.
- the spectroscopic measurement mechanism 168 may be replaced with a measurement mechanism other than the spectroscopic measurement mechanism, and the spectroscopic measurement may be replaced with a measurement for colorimetry other than the spectroscopic measurement.
- the spectroscopic measurement mechanism 168 may be replaced with a mechanism for measuring tristimulus values, and the spectroscopic measurement may be replaced with measurement of tristimulus values.
- the multi-angle colorimeter 100 has an array surface including a reference axis 132 that passes through the position 121 to be measured.
- Light emitting diodes 150j and 150k measured position 121, lenses 159a, 159b, 159c, 159d, 159e, 159f, 159g, 159h, 159i, 159j and 159k, entrances 163a, 163b, 163c, 163d, 163e, 163f, 163g, 163h, 163i, 163j, and 163k and monitor illumination lights 126j and 126k are arranged on the arrangement surface.
- the illumination lights 124j and 124k, the reflected lights 125a, 125b, 125c, 125d, 125e, 125f, 125g, 125h and 125i and the monitor illumination lights 126j and 126k travel on the arrangement surface. It is also allowed that the monitor illumination lights 126j and 126k do not travel on the arrangement surface.
- the light emitting diodes 150j and 150k are arranged symmetrically with respect to the reference axis 132.
- the lenses 159a, 159b, 159c, 159d, 159e, 159f, 159g, 159h and 159i are arranged symmetrically with respect to the reference axis 132.
- the entrances 163a, 163b, 163c, 163d, 163e, 163f, 163g, 163h and 163i are arranged symmetrically with respect to the reference axis 132.
- the angle indicating the inclination of the optical path of the illumination light from the reference axis 132 is referred to as the illumination angle of the illumination light
- the angle indicating the inclination of the optical path of the reflected light from the reference axis 132 is referred to as the reception angle of the reflected light.
- the illumination angle and the light receiving angle take positive values.
- the light emitting diode 150k is arranged symmetrically with the light emitting diode 150j with respect to the reference axis 132. For this reason, the illumination angle of the illumination light 124k is the same as the illumination angle of the illumination light 124j.
- the illumination angle of the illumination light 124j and the illumination angle of the illumination light 124k are 45 °.
- the entrance 163b is arranged symmetrically with the entrance 163a with respect to the reference axis 132. For this reason, the light receiving angle of the reflected light 125b is the same as the light receiving angle of the reflected light 125a.
- the light receiving angle of the reflected light 125a and the light receiving angle of the reflected light 125b are 20 °.
- the entrance 163d is arranged symmetrically with the entrance 163c with respect to the reference axis 132. For this reason, the light receiving angle of the reflected light 125d is the same as the light receiving angle of the reflected light 125c.
- the light receiving angle of the reflected light 125c and the light receiving angle of the reflected light 125d are 30 °.
- the entrance 163f is arranged symmetrically with the entrance 163e with respect to the reference axis 132. For this reason, the light receiving angle of the reflected light 125f is the same as the light receiving angle of the reflected light 125e.
- the light receiving angle of the reflected light 125e and the light receiving angle of the reflected light 125f are 60 °.
- the entrance 163h is arranged symmetrically with the entrance 163g with respect to the reference axis 132. For this reason, the light receiving angle of the reflected light 125h is the same as the light receiving angle of the reflected light 125g.
- the light receiving angle of the reflected light 125g and the light receiving angle of the reflected light 125h are 70 °.
- the incident port 163i is disposed on the reference axis 132.
- the light receiving angle of the reflected light 125i is 0 °.
- the angle indicating the inclination of the optical path of the reflected light from the regular reflection direction is referred to as the aspecular angle (AS angle) of the reflected light.
- the AS angle of the reflected light takes a positive value when the optical path of the reflected light is inclined in the direction from the regular reflection direction toward the reference axis 132, and in the direction opposite to the direction from the regular reflection direction toward the reference axis 132.
- the optical path of the reflected light is inclined, it takes a negative value.
- the geometric conditions 1, 2, 3, 4, 5, and 6 shown in Table 1 are satisfied.
- the illumination light can be emitted and the reflected light can be received, and spectroscopic measurement can be performed according to each of the geometric conditions 1, 2, 3, 4, 5, and 6 shown in Table 1.
- Table 1 shows a light-emitting diode that emits illumination light and an entrance through which reflected light that is an object of spectroscopic measurement enters when spectroscopic measurement is performed according to each of geometric conditions 1, 2, 3, 4, 5, and 6.
- the illumination angle of the illumination light, the reception angle of the reflected light to be subjected to spectroscopic measurement, and the AS angle of the reflected light to be spectroscopically measured are shown.
- Each of the geometric conditions 1, 2, 3, 4, 5, and 6 can be defined by a set of an illumination angle of illumination light and a reception angle of reflected light.
- the spectroscopic measurement is performed under the geometric condition 1 and the light emitting diode 150j emits the illumination light 124j
- the spectroscopic measurement is performed on the reflected light 125f.
- the spectroscopic measurement is performed under the geometric condition 1 and the light emitting diode 150k emits the illumination light 124k
- the spectroscopic measurement is performed on the reflected light 125e.
- the illumination angle of the illumination light is 45 °
- the reception angle of the reflected light is 60 °
- the AS angle of the reflected light is ⁇ 15 °.
- the spectroscopic measurement is performed under the geometric condition 2 and the light emitting diode 150j emits the illumination light 124j
- the spectroscopic measurement is performed on the reflected light 125c incident on the incident port 163c.
- the spectroscopic measurement is performed under the geometric condition 2 and the light emitting diode 150k emits the illumination light 124k
- the spectroscopic measurement is performed on the reflected light 125d incident on the incident port 163d.
- the illumination angle of the illumination light is 45 °
- the reception angle of the reflected light is 30 °
- the AS angle of the reflected light is 15 °.
- the spectroscopic measurement is performed under the geometric condition 3 and the light emitting diode 150j emits the illumination light 124j
- the spectroscopic measurement is performed on the reflected light 125a incident on the incident port 163a.
- the light emitting diode 150k emits the illumination light 124k
- the spectroscopic measurement is performed on the reflected light 125b incident on the incident port 163b.
- the illumination angle of the illumination light is 45 °
- the reception angle of the reflected light is 20 °
- the AS angle of the reflected light is 25 °.
- the spectroscopic measurement is performed under the geometric condition 4 and the light emitting diode 150j emits the illumination light 124j
- the spectroscopic measurement is performed on the reflected light 125i incident on the incident port 163i.
- the spectroscopic measurement is performed under the geometric condition 4 and the light emitting diode 150k emits the illumination light 124k
- the spectroscopic measurement is performed on the reflected light 125i incident on the incident port 163i.
- the illumination angle of the illumination light is 45 °
- the reception angle of the reflected light is 0 °
- the AS angle of the reflected light is 45 °.
- the spectroscopic measurement is performed under the geometric condition 5 and the light emitting diode 150j emits the illumination light 124j
- the spectroscopic measurement is performed on the reflected light 125d incident on the incident port 163d.
- the spectroscopic measurement is performed under the geometric condition 5 and the light emitting diode 150k emits the illumination light 124k
- the spectroscopic measurement is performed on the reflected light 125c incident on the incident port 163c.
- the illumination angle of the illumination light is 45 °
- the reception angle of the reflected light is 30 °
- the AS angle of the reflected light is 75 °.
- the spectroscopic measurement is performed according to the geometric condition 6 and the light emitting diode 150j emits the illumination light 124j
- the spectroscopic measurement is performed on the mixed light of the reflected lights 125e and 125g incident on the incident ports 163e and 163g, respectively. Is called.
- the spectroscopic measurement is performed according to the geometric condition 6 and the light emitting diode 150k emits the illumination light 124k
- the spectroscopic measurement is performed on the mixed light of the reflected lights 125f and 125h incident on the incident ports 163f and 163h, respectively. Is called.
- the illumination angle of the illumination light is 45 °
- the reception angle of the reflected light is 65 °
- the AS angle of the reflected light is 110 °.
- the light emitting diodes 150j and 150k are arranged symmetrically with respect to the reference axis 132 and the entrances 163a, 163b, 163c, 163d, 163e, 163f, 163g, 163h, and 163i are arranged symmetrically with respect to the reference axis 132, the geometric conditions 1, 2 , 3, 4, 5 and 6, the light-emitting diode 150j emits the illumination light 124j (hereinafter referred to as “main spectroscopy”) and the light-emitting diode 150k emits the illumination light 124k. (Hereinafter referred to as “auxiliary spectroscopic measurement”).
- both the main spectroscopic measurement and the auxiliary spectroscopic measurement are performed for each of the geometric conditions 1, 2, 3, 4, 5 and 6, and the result of the main spectroscopic measurement and the result of the auxiliary spectroscopic measurement are performed.
- double pass correction is performed.
- the light emitting diode and the entrance may be arranged so that illumination light can be emitted and reflected light can be received by each of a plurality of geometric conditions different from the geometric conditions 1, 2, 3, 4, 5, and 6.
- FIG. 11 shows a switching mechanism and a light guide mechanism included in the multi-angle colorimeter.
- FIG. 11 is a perspective view.
- the schematic diagram of FIG. 12 shows a rotating body and a light guide mechanism provided in the multi-angle colorimeter.
- FIG. 12 is a plan view.
- the switching mechanism 167 includes a rotating body 171 and a stepping motor 172 as shown in FIG.
- the rotating body 171 includes a disk-shaped structure 175.
- the disk-shaped structure 175 is a light shielding object.
- the disc-shaped structure 175 includes the first candidate, the second candidate, the third candidate, the fourth candidate, the fifth candidate, the sixth candidate, the seventh candidate, the eighth candidate, There are windows 178j, 178k, 178e, 178f, 178fh, 178eg, 178i, 178c, 178d, 178c ′, 178b and 178a corresponding to 9 candidates, 10th candidate, 11th candidate, and 12th candidate, respectively.
- Each of the windows 178j, 178k, 178e, 178f, 178fh, 178eg, 178i, 178c, 178d, 178c ′, 178b and 178a is formed in the disk-shaped structure 175, and is one main body of the disk-shaped structure 175. This is a structure having a hollow through hole extending from the surface 181 to the other main surface 182 of the disk-shaped structure 175.
- Each of the windows 178j, 178k, 178e, 178f, 178fh, 178eg, 178i, 178c, 178d, 178c ′, 178b, and 178a further has a light-transmitting body that has the through-hole and is inserted into the through-hole. There may be.
- the window 178j corresponds to the first candidate
- the monitor illumination light 126j belongs to the first candidate
- the monitor illumination light 126k and the reflected light 125a, 125b, 125c, 125d belong to the first candidate.
- the structure 175 blocks the illumination light 126k for monitoring and the reflected lights 125a, 125b, 125c, 125d, 125e, 125f, 125g, 125h and 125i.
- the windows 178j, 178k, 178e, 178f, 178fh, 178eg, 178i, 178c, 178d, 178c ', 178b, and 178a are distributed in the circumferential direction of the disk-shaped structure 175.
- the stepping motor 172 circles the rotating body 171 from a state in which light belonging to one candidate passes through a window corresponding to the one candidate to a state in which light belonging to another candidate passes through a window corresponding to the other candidate.
- the rotation mechanism including the stepping motor 172 may be replaced with another type of rotation mechanism.
- the switching mechanism 167 may be replaced with another type of switching mechanism.
- the switching mechanism 167 includes a plurality of shutters by providing a shutter corresponding to each of the entrances 163a, 163b, 163c, 163d, 163e, 163f, 163g, 163h, 163i, 163j, and 163k, and from a plurality of candidates.
- a switching mechanism that further includes a mechanism that controls a plurality of shutters so that light that does not belong to a candidate selected from a plurality of candidates can be blocked without blocking light that belongs to the selected candidate may be replaced.
- the switching mechanism 167 may be omitted.
- a spectroscopic measurement mechanism that performs spectroscopic measurement for each of eleven lights, which are illumination light 126j and 126k for monitoring and reflected light 125a, 125b, 125c, 125d, 125e, 125f, 125g, 125h, and 125i, is provided.
- 11 spectroscopic measurement mechanisms are provided, switching of the spectroscopic measurement mechanism becomes unnecessary.
- Transition from a state in which light belonging to one candidate passes through a window corresponding to the one candidate to a state in which light belonging to another candidate passes through a window corresponding to the other candidate is performed by a motion other than rotation.
- the translation body including the rectangular plate-like structure is rectangularly shaped by a linear stepping motor.
- the transition may be performed by translating in the longitudinal direction of the plate-like structure. More generally, the transition may be performed by moving a moving body including a structure by a movement mechanism.
- the switching mechanism 167 includes an origin detector 185.
- a window 178x for detecting the origin is formed in the disk-shaped structure 175. When the origin detection window 178x is arranged at a specific position, the rotating body 171 is arranged at the origin position.
- the origin detector 185 outputs a signal indicating whether or not the origin detection window 178x is arranged at a specific position.
- the origin detection window 178x is arranged at a specific position
- the rotator 171 is arranged at the origin position. Therefore, the signal output from the origin detector 185 indicates whether or not the rotator 171 is arranged at the origin position. Indicate.
- the window 178j is disposed on the optical path of the monitor illumination light 126j, and the switching mechanism 167 does not block the monitor illumination light 126j.
- the spectral measurement mechanism 168 includes an optical system 188, a linear variable filter 189, and a line sensor 190, as shown in FIG.
- the optical system 188 includes cylindrical lenses 191, 192 and 193.
- the light not blocked by the switching mechanism 167 passes through the optical system 188. While the light passes through the optical system 188, the cross section of the light is converted from a circular shape to a linear shape.
- the direction in which the linear cross section extends coincides with the wavelength change direction in the linear variable filter 189 and coincides with the sensor arrangement direction in the line sensor 190.
- the light that has passed through the optical system 188 passes through the linear variable filter 189.
- the wavelength of light passing therethrough continuously changes according to the position in the wavelength changing direction. For this reason, when light having a linear cross section extending in a direction coinciding with the wavelength change direction in the linear variable filter 189 passes through the linear variable filter 189, the wavelength is continuous according to the position in the direction in which the linear cross section extends. Changing light can be obtained.
- the light that has passed through the linear variable filter 189 is received by the line sensor 190.
- the line sensor 190 receives light having a linear cross section extending in a direction corresponding to the sensor arrangement direction in the line sensor 190 and having a wavelength that continuously changes in accordance with the position in the direction in which the linear cross section extends.
- An electrical signal is output from each of the plurality of sensors, and the electrical signal indicates the intensity of the wavelength component corresponding to the sensor that outputs the electrical signal.
- an electric signal indicating the intensity of each of the plurality of wavelength components is output from the line sensor 190.
- the linear variable filter 189 may be replaced with a division filter.
- the division filter In the division filter, the wavelength of the transmitted light changes discretely according to the position in the wavelength change direction.
- the division filter includes a plurality of filters having different transmission wavelengths. The plurality of filters are arranged in the wavelength change direction in the division filter.
- the spectroscopic measurement mechanism 168 may be replaced with another type of spectroscopic measurement mechanism.
- the spectroscopic measurement mechanism 168 may be replaced with a spectroscopic measurement mechanism that receives light wavelength-dispersed by a wavelength dispersion element such as a diffraction grating or a prism by a line sensor.
- the control unit 105 is an embedded computer that includes a CPU, a memory, and the like, and loads and executes firmware installed in the storage unit 107. Thereby, the function of the measurement control part 111 and the calculating part 112 is implement
- the measurement control mechanism including the measurement control unit 111 realized by an embedded computer may be replaced with another type of measurement control mechanism.
- all or part of the functions realized by the embedded computer may be realized by hardware such as an electronic circuit.
- the calculation mechanism including the calculation unit 112 realized by an embedded computer may be replaced with another type of calculation mechanism.
- the operation display unit 106 includes an operation unit 195 and a display unit 196, as shown in FIG.
- An operation performed on the operation unit 195 is detected by the control unit 105 and reflected in measurement control or the like.
- the display unit 196 displays color measurement results and the like.
- the display content of the display unit 196 is controlled by the control unit 105.
- FIGS. 13 and 14 show the flow of operation when spectroscopic measurement is performed.
- step S ⁇ b> 1 the measurement control unit 111 acquires the signal output from the origin detector 185, and rotates to the origin position based on the signal. It is determined whether or not the body 171 is arranged.
- step S2 the measurement control unit 111 causes the stepping motor 172 to rotate the rotating body 171 in the circumferential direction by a predetermined angle.
- step S1 the measurement control unit 111 determines again whether or not the rotating body 171 is disposed at the origin position. Thereby, the rotating body 171 is rotated in the circumferential direction until the rotating body 171 is arranged at the origin position.
- the measurement control unit 111 determines that the rotator 171 is located at the origin position, the measurement control unit 111 monitors the illumination light receiving optical system 103 and the spectroscopic block 104 for illumination light before measurement in step S3. Make it.
- the measurement control unit 111 performs spectroscopic measurement on the illumination light receiving optical system 103 and the spectroscopic block 104 according to geometric conditions 1, 2, 3, 4, 5, and 6, respectively. Let it be done. Prior to the spectroscopic measurement in steps S5, S7, S7, S9, S13 and S15, the angle at which the measurement control unit 111 determines the rotating body 171 for the stepping motor 172 in steps S4, 6, 8, 10, 12 and 14 respectively. Only rotate in the circumferential direction.
- step S16 the measurement control unit 111 causes the stepping motor 172 to rotate the rotating body 171 in the circumferential direction by a predetermined angle.
- step S17 the measurement control unit 111 causes the illumination light receiving optical system 103 and the spectroscopic block 104 to move. Monitor the illumination light after the measurement.
- step S18 the measurement control unit 111 causes the stepping motor 172 to rotate the rotating body 171 in the circumferential direction by a predetermined angle, thereby returning the rotating body 171 to the origin position.
- step S19 the measurement control unit 111 acquires the signal output from the origin detector 185, and determines whether or not the rotating body 171 is disposed at the origin position based on the signal.
- the measurement control unit 111 determines that the rotating body 171 is disposed at the origin position.
- the measurement control unit 111 determines that the rotating body 171 is not disposed at the origin position, the measurement control unit 111 performs error processing such as notification of abnormality in step S20. Remeasurement may be performed instead of error processing.
- FIG. 15 shows the flow of operations that the measurement control unit causes the illumination light receiving optical system and the spectral block to perform when monitoring the illumination light before measurement.
- the illumination light receiving optical system 103 emits the illumination light 124j, receives the illumination light 126j for monitoring, and performs spectral analysis.
- the measuring mechanism 168 performs spectroscopic measurement on the monitor illumination light 126j and outputs the spectroscopic measurement result.
- the switching mechanism 167 does not block the monitor illumination light 126j. For this reason, the spectroscopic measurement with respect to the illumination light 126j for monitoring is performed while maintaining this state in which the rotating body 171 is disposed at the origin position.
- step S22 the light that is not blocked by the switching mechanism 167 is switched, so that the switching mechanism 167 does not block the illumination light 126k for monitoring.
- step S23 the illumination light receiving optical system 103 emits the illumination light 124k and receives the monitor illumination light 126k, and the spectroscopic measurement mechanism 168 performs spectroscopic measurement on the monitor illumination light 126k. Outputs the result of spectroscopic measurement.
- FIG. 16 shows the flow of operations that the measurement control unit causes the illumination light receiving optical system and the spectral block to perform when spectroscopic measurement under geometric condition 1 is performed.
- step S42 the illumination light receiving optical system 103 emits the illumination light 124j and receives the reflected light 125f, and the spectroscopic measurement mechanism 168 performs the main spectroscopic measurement on the reflected light 125f and results of the main spectroscopic measurement. Is output.
- step S43 the light that is not blocked by the switching mechanism 167 is switched, and the switching mechanism 167 is in a state of not blocking the reflected light 125e.
- step S44 the illumination light receiving optical system 103 emits the illumination light 124k and receives the reflected light 125e, and the spectroscopic measurement mechanism 168 performs auxiliary spectroscopic measurement on the reflected light 125e, and results of the auxiliary spectroscopic measurement. Is output.
- steps S45 and S46 dark measurement is performed in a state where the illumination lights 124j and 124k are not emitted.
- the light emitting diode 150k that emits the illumination light 124k is arranged symmetrically with respect to the light emitting diode 150j that emits the illumination light 124j with respect to the reference axis 132, and the incident port 163e through which the reflected light 125e enters is the reflected light 125f with respect to the reference axis 132. Is arranged symmetrically with respect to the incident port 163f where the light enters. Since the light emitting diodes 150j and 150k and the entrances 163e and 163f are selected so as to realize such a symmetrical arrangement, the result of the main spectroscopic measurement and the result of the auxiliary spectroscopic measurement can be used for the double pass correction.
- the main spectroscopic measurement and the auxiliary spectroscopic measurement are performed while the geometric condition 1 is maintained, and the geometric conditions 2, 3, 4, and 4 are interposed between the main spectroscopic measurement and the auxiliary spectroscopic measurement. Since the main spectroscopic measurement or the auxiliary spectroscopic measurement by 5 or 6 is not performed, the time required from the main spectroscopic measurement by the geometric condition 1 to the auxiliary spectroscopic measurement by the geometric condition 1 is shortened. This contributes to the completion of the double-pass correction in a short time and the suppression of the influence of camera shake on the result of the spectroscopic measurement subjected to the double-pass correction.
- FIG. 17 shows the flow of operations that the measurement control unit causes the illumination light receiving optical system and the spectral block to perform when monitoring the illumination light after measurement.
- step S61 When the illumination light after measurement is monitored, as shown in FIG. 17, in step S61, the light blocked by the switching mechanism 167 is switched, and the switching mechanism 167 does not block the illumination light 126j for monitoring. become.
- step S62 the illumination light receiving optical system 103 emits the illumination light 124j and receives the monitor illumination light 126j, and the spectroscopic measurement mechanism 168 performs spectroscopic measurement on the monitor illumination light 126j. Outputs the result of spectroscopic measurement.
- step S63 the light blocked by the switching mechanism 167 is switched, and the switching mechanism 167 does not block the illumination light 126k for monitoring.
- step S64 the illumination light receiving optical system 103 emits the illumination light 124k and receives the monitor illumination light 126k, and the spectroscopic measurement mechanism 168 performs spectroscopic measurement on the monitor illumination light 126k.
- the spectroscopic measurement result is output.
- the calculation unit 112 calculates the result of the spectroscopic measurement that has been double-pass corrected based on the average of the result of the main spectroscopic measurement and the result of the auxiliary spectroscopic measurement. Further, the calculation unit 112 calculates a colorimetric value from the result of the spectroscopic measurement that has been double-pass corrected.
- the colorimetric values are expressed in Munsell color system, L * a * b * color system, L * C * h color system, Hunter Lab color system, XYZ color system, and the like.
- the result of the spectroscopic measurement may be corrected by the result of the dark measurement, the result of the spectroscopic measurement with respect to the illumination light for monitoring, or the like.
- Outlets 164a, 164b, 164c, 164d, 164e, 164f, 164g, 164h, and 164i are from the exit that emits reflected light having a relatively large light receiving angle to the optical axis 198 of the spectroscopic measurement mechanism 168. Is relatively long, and the distance from the exit for emitting reflected light with a relatively small acceptance angle to the optical axis 198 of the spectroscopic measurement mechanism 168 is arranged to be relatively short.
- the exit ports 164c and 164d that emit the reflected lights 125c and 125d with a light receiving angle of 30 ° are the optical axes of the spectroscopic measurement mechanism 168 from the exit ports 164a and 164b that emit the reflected lights 125a and 125b with a light receiving angle of 20 °, respectively. Close to 198.
- the amount of reflected light received by the illumination light receiving optical system 103 decreases as the reflected light receiving angle increases, and the amount of reflected light received by the line sensor 190 increases the inclination of the optical path of reflected light from the optical axis 198. It decreases. For this reason, when the exits 164a, 164b, 164c, 164d, 164e, 164f, 164g, 164h, and 164i are arranged so as to satisfy the relationship with respect to the distance to the optical axis, the sensitivity due to the light receiving angle of the reflected light. The change of is suppressed.
- the exits 164a, 164b, 164c, 164d, 164e, 164a, 164b, 164c, 164d, 164e, 164f, 164g, 164h, and 164i all satisfy the relationship regarding the distance to the optical axis.
- 164 f, 164 g, 164 h and 164 i are arranged, but only a part of the emission ports 164 a, 164 b, 164 c, 164 d, 164 e, 164 f, 164 g, 164 h and 164 i satisfy the above relationship regarding the distance to the optical axis.
- exit ports 164a, 164b, 164c, 164d, 164e, 164f, 164g, 164h, 164i, 164j and 164k are arranged in two rows, and the exit ports 164a, 164b, 164c, 164d, which emit the reflected light of them.
- 164e, 164f, 164g, 164h and 164i are also arranged in two rows.
- the exits 164a, 164b, 164c, 164d, 164e, 164f, 164g, 164h, 164i, 164j and 164k are not spread over a long distance, and the change in sensitivity due to the exit is suppressed.
- the exit ports 164a, 164c, 164e, 164g, 164i and 164j are arranged in the first row and arranged in the arrangement direction indicated by the arrow 196.
- the exit ports 164b, 164d, 164f, 164h, and 164k are arranged in the second row and arranged in the arrangement direction indicated by the arrow 196.
- the exit ports 164a, 164b, 164c, 164d, 164e, 164f, 164g, 164h, 164i, 164j, and 164k may be arranged in three or more rows, and the exit ports 164a, 164b, 164c, 164d that emit reflected light may be arranged.
- 164e, 164f, 164g, 164h and 164i may be arranged in three or more rows.
- the exit ports 164a, 164c, 164e, 164g, and 164i arranged in the first column emit the reflected lights 125a, 125c, 125e, 125g, and 125i that are the targets of the main spectroscopic measurement, respectively.
- the emission ports 164j arranged in the first column emit the monitor illumination light 126j used for the main spectroscopic measurement.
- the exit ports 164b, 164d, 164f, and 164h arranged in the second column respectively emit the reflected lights 125b, 125d, 125f, and 125h that are the targets of the auxiliary spectroscopic measurement.
- the exits 164k arranged in the second row emit the monitor illumination light 126k used for auxiliary spectroscopic measurement.
- the exits 164a, 164c, 164e, 164g, 164i and 164j are linearly arranged, and the arrangement pitch is p.
- the emission ports 164b, 164d, 164f, 164h, and 164k are linearly arranged, and the pitch of the arrangement is p.
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Abstract
Description
図1の模式図は、マルチアングル測色計を示す。図1は、斜視図であり、外観を示す。図2の模式図は、マルチアングル測色計及び試料を示す。図2は、ブロック図である。図3の模式図は、照明受光光学系の主要部、筐体及び試料を示す。図4の模式図は、分光ブロックを示す。図3及び4の各々は、断面を示す。
2.1 傾きの影響
図5の模式図は、筐体及び試料を示す。図5は、断面図である。
マルチアングル測色計100においては、照明受光光学系103が基準軸132について対称となる対称配置が採用される。
3.1 照明機構
照明受光光学系103は、図2に示されるように、照明機構138を備える。照明機構138は、照明部142j及び142kを備える。照明部142jは、発光回路145j、放射機構146j及びビームスプリッター147jを備える。照明部142kは、発光回路145k、放射機構146k及びビームスプリッター147kを備える。放射機構146jは、図3に示されるように、発光ダイオード150j及びコリメートレンズ152jを備える。放射機構146kは、図3に示されるように、発光ダイオード150k及びコリメートレンズ152kを備える。
照明受光光学系103は、図2に示されるように、受光機構139をさらに備える。受光機構139は、レンズ群155及び導光機構156を備える。
分光ブロック104は、図4に示されるように、切り替え機構167及び分光測定機構168を備える。
マルチアングル測色計100には、被測定位置121を通る基準軸132を含む配列面が存在する。発光ダイオード150j及び150k、被測定位置121、レンズ159a,159b,159c,159d,159e,159f,159g,159h,159i,159j及び159k、入射口163a,163b,163c,163d,163e,163f,163g,163h,163i,163j及び163k並びにモニター用の照明光126j及び126kは、当該配列面上に配列される。このため、照明光124j及び124k、反射光125a,125b,125c,125d,125e,125f,125g,125h及び125i及びモニター用の照明光126j及び126kは、配列面上を進む。モニター用の照明光126j及び126kが配列面上を進まないことも許される。
以下では、正反射方向からの反射光の光路の傾きを示す角を反射光のアスペキュラー角(AS角)という。反射光のAS角は、正反射方向から基準軸132へ向かう方向に反射光の光路が傾いている場合は正の値をとり、正反射方向から基準軸132へ向かう方向とは反対の方向に反射光の光路が傾いている場合は負の値をとる。
図11の模式図は、マルチアングル測色計が備える切り替え機構及び導光機構を示す。図11は、斜視図である。図12の模式図は、マルチアングル測色計が備える回転体及び導光機構を示す。図12は、平面図である。
分光測定機構168は、図4に示されるように、光学系188、リニアバリアブルフィルター189及びラインセンサー190を備える。光学系188は、シリンドリカルレンズ191,192及び193を有する。
制御部105は、CPU、メモリー等を備える組み込みコンピューターであり、記憶部107にインストールされたファームウェアをロードして実行する。これにより、測定制御部111及び演算部112の機能が実現される。組み込みコンピューターにより実現される測定制御部111からなる測定制御機構が他の種類の測定制御機構に置き換えられてもよい。例えば、組み込みコンピューターにより実現される機能の全部又は一部が電子回路等のハードウェアにより実現されてもよい。同様に、組み込みコンピューターにより実現される演算部112からなる演算機構が他の種類の演算機構に置き換えられてもよい。
図13及び14のフローチャートは、分光測定が行われる場合の動作の流れを示す。
図15のフローチャートは、測定前の照明光のモニターが行われる場合に測定制御部が照明受光光学系及び分光ブロックに行わせる動作の流れを示す。
図16のフローチャートは、幾何条件1による分光測定が行われる場合に測定制御部が照明受光光学系及び分光ブロックに行わせる動作の流れを示す。
図17のフローチャートは、測定後の照明光のモニターが行われる場合に測定制御部が照明受光光学系及び分光ブロックに行わせる動作の流れを示す。
演算部112は、主分光測定の結果及び補助分光測定の結果の平均に基づいてダブルパス補正された分光測定の結果を演算する。また、演算部112は、ダブルパス補正された分光測定の結果から測色値を演算する。測色値は、マンセル表色系、L*a*b*表色系、L*C*h表色系、ハンターLab表色系、XYZ表色系等で表現される。分光測定の結果がダーク測定の結果、モニター用の照明光に対する分光測定の結果等により補正されてもよい。
出射口164a,164b,164c,164d,164e,164f,164g,164h及び164iは、相対的に大きな受光角の反射光を出射させる出射口から分光測定機構168の光軸198までの距離が相対的に長くなり、相対的に小さな受光角の反射光を出射させる出射口から分光測定機構168の光軸198までの距離が相対的に短くなるように配列される。例えば、受光角30°の反射光125c及び125dをそれぞれ出射させる出射口164c及び164dは、受光角20°の反射光125a及び125bをそれぞれ出射させる出射口164a及び164bより分光測定機構168の光軸198に近い。
103 照明受光光学系
104 分光ブロック
111 測定制御部
112 演算部
121 被測定位置
132 基準軸
167 切り替え機構
168 分光測定機構
171 回転体
172 ステッピングモーター
175 円板状の構造物
Claims (6)
- 被測定位置を通る基準軸について対称に配置される複数の放射位置を有し、前記基準軸について対称に配置される複数の受光位置を有し、前記複数の放射位置の各々から前記被測定位置へ向かう照明光を放射し、前記被測定位置から前記複数の受光位置の各々へ向かう反射光を受光し、複数の幾何条件の各々による照明光の放射及び反射光の受光が可能となるように前記複数の放射位置及び前記複数の受光位置が配置される照明受光光学系と、
前記照明受光光学系により受光された反射光に対して測色のための測定を行い測色のための測定の結果を出力する測定機構と、
前記複数の幾何条件の各々について幾何条件を維持したまま前記照明受光光学系及び前記測定機構に第1の測定動作及び第2の測定動作を行わせ、前記第1の測定動作においては前記照明受光光学系に第1の放射位置から前記被測定位置へ向かう照明光を放射させ前記被測定位置から第1の受光位置へ向かう反射光を受光させ前記測定機構に前記被測定位置から前記第1の受光位置へ向かう反射光に対して測色のための測定を行わせ測色のための測定の結果を出力させ、前記第2の測定動作においては前記照明受光光学系に第2の放射位置から前記被測定位置へ向かう照明光を放射させ前記被測定位置から第2の受光位置へ向かう反射光を受光させ前記測定機構に前記被測定位置から前記第2の受光位置へ向かう反射光に対して測色のための測定を行わせ測色のための測定の結果を出力させ、前記第1の放射位置及び前記第2の放射位置の各々を前記複数の放射位置のいずれかとし、前記第1の受光位置及び前記第2の受光位置の各々を前記複数の受光位置のいずれかとし、前記第2の放射位置及び前記第2の受光位置を前記基準軸について前記第1の放射位置及び前記第1の受光位置とそれぞれ対称にする測定制御機構と、
前記被測定位置から前記第1の受光位置へ向かう反射光に対する測色のための測定の結果及び前記被測定位置から前記第2の受光位置へ向かう反射光に対する測色のための測定の結果の平均に基づいて補正された測色のための測定の結果を演算する演算機構と、
を備えるマルチアングル測色計。 - 前記測定機構は、光軸を有し、
前記照明受光光学系は、
前記複数の受光位置の各々において受光される反射光が入射する入射口を有することにより複数の入射口を有し、前記複数の入射口の各々に入射する反射光が導かれ導かれた反射光を出射させる出射口を有することにより複数の出射口を有し、前記複数の出射口の全部又は一部について相対的に大きな受光角の反射光を出射させる出射口から前記光軸までの距離が相対的に長く相対的に小さな受光角の反射光を出射させる出射口から前記光軸までの距離が相対的に短くなるように前記複数の出射口が配列される導光機構
を備える
請求項1のマルチアングル測色計。 - 複数の候補から選択される候補に属する光を遮らず、前記複数の候補から選択される候補に属しない光を遮り、前記複数の候補から選択される候補を切り替え可能である切り替え機構
をさらに備え、
前記測定機構は、前記切り替え機構に遮られない反射光に対して測色のための測定を行い測色のための測定の結果を出力する
請求項1又は2のマルチアングル測色計。 - 前記切り替え機構は、
構造物を備え、前記構造物が前記複数の候補の各々に対応する窓を有することにより複数の窓を有し、前記複数の窓のうちの任意の一の窓が対応する候補に属する反射光の光路上に配置された場合に前記一の窓が対応する候補に属する反射光を通過させ前記構造物が前記一の窓に対応する候補に属しない反射光を遮る運動体と、
一の候補に属する反射光が前記一の候補に対応する窓を通過する状態から他の候補に属する反射光が前記他の候補に対応する窓を通過する状態へ前記運動体を運動させることにより前記複数の候補から選択される候補を切り替え可能である運動機構と、
を備える
請求項3のマルチアングル測色計。 - 前記複数の出射口が2列以上にわかれて配列される
請求項2のマルチアングル測色計。 - 前記照明受光光学系は、前記複数の放射位置の各々から前記被測定位置へ向かう照明光から分岐したモニター用の照明光を受光し、
前記測定機構は、前記照明受光光学系により受光されるモニター用の照明光に対して測色のための測定を行い測色のための測定の結果を出力し、
前記測定制御機構は、
前記照明受光光学系及び前記測定機構に第1の動作の後に第2の動作を行わせ前記第2の動作の後に第3の動作を行わせ、
前記第1の動作及び前記第3の動作の各々においては、前記照明受光光学系に前記複数の放射位置の各々から前記被測定位置へ向かう照明光を放射させモニター用の照明光を受光させ、前記測定機構に前記照明受光光学系により受光されるモニター用の照明光に対して測色のための測定を行わせ測色のための測定の結果を出力させ、
前記第2の動作においては、前記照明受光光学系及び前記測定機構に前記複数の幾何条件の各々について前記第1の測定動作及び前記第2の測定動作を行わせる
請求項1から5までのいずれかのマルチアングル測色計。
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