WO2014192554A1 - 照明装置及び反射特性測定装置 - Google Patents
照明装置及び反射特性測定装置 Download PDFInfo
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- WO2014192554A1 WO2014192554A1 PCT/JP2014/062962 JP2014062962W WO2014192554A1 WO 2014192554 A1 WO2014192554 A1 WO 2014192554A1 JP 2014062962 W JP2014062962 W JP 2014062962W WO 2014192554 A1 WO2014192554 A1 WO 2014192554A1
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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
- G01J3/28—Investigating the spectrum
- G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
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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
-
- 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
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/0271—Housings; Attachments or accessories for photometers
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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
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
- G01J1/16—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors
- G01J1/1626—Arrangements with two photodetectors, the signals of which are compared
-
- 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
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter 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
- G01J3/02—Details
- G01J3/0262—Constructional arrangements for removing stray light
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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
- G01J3/0291—Housings; Spectrometer accessories; Spatial arrangement of elements, e.g. folded path 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
- G01J3/04—Slit arrangements slit adjustment
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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
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
- G01J1/16—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors
- G01J1/1626—Arrangements with two photodetectors, the signals of which are compared
- G01J2001/1636—Arrangements with two photodetectors, the signals of which are compared one detector directly monitoring the source, e.g. also impulse time controlling
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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
- G01J3/28—Investigating the spectrum
- G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
- G01J2003/425—Reflectance
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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
Definitions
- the present invention relates to an illumination device and a reflection characteristic measuring device.
- the measurement result of the measuring device that illuminates the sample and measures the reflected light, transmitted light, etc. from the sample is affected by the intensity of the illumination light. For this reason, it is required to monitor the intensity of illumination light in the measurement apparatus.
- a light beam emitted from a light source (LED) in a normal direction is guided to a sample to become illumination light, and a light beam emitted from a light source in a non-normal direction is detected by a photodetector (light receiving). Sensor).
- the intensity of the light beam guided to the photodetector is detected by the photodetector.
- the detection result of the photodetector is used to correct the measurement result.
- the intensity of the light beam guided to the photodetector may not change with time in the same manner as the intensity of the light beam guided to the sample, and the detection result of the photodetector is guided to the sample. In some cases, it is not an index that appropriately reflects the intensity of the light beam. In such a case, the measurement result is not properly corrected.
- the present invention is made to solve this problem.
- the objective of this invention is providing the illuminating device from which the parameter
- Another object of the present invention is to provide a reflection characteristic measuring apparatus in which spectroscopic measurement is accurately performed.
- the lighting device comprises a light source, a photodetector and a support structure.
- the light source emits light.
- the light source has a light distribution with a reference axis as a symmetry axis or a light distribution with a plane including the reference axis as a symmetry plane.
- the first light bundle included in the light is guided to the object to be illuminated.
- the second light bundle contained in the light is guided to the photodetector.
- the photodetector detects the intensity of the second light bundle.
- the light source and the light detector are supported by the support structure at the positions and postures where the first light flux and the second light flux are guided in this way.
- the traveling direction of the first light beam forms a first angle with the reference axis.
- the traveling direction of the second light beam forms a second angle with the reference axis.
- the second angle is the same as the first angle.
- the reflection characteristic measurement device includes the above-described illumination device, spectroscopic measurement mechanism, and correction unit.
- the spectroscopic measurement device spectroscopically measures the reflected light from the object to be illuminated.
- the correction unit corrects the measurement result of the spectroscopic measurement mechanism using the detection result of the photodetector. In this correction, correction for eliminating the temporal change in the intensity of the first light beam is performed.
- the first embodiment relates to a lighting device.
- FIG. 1 schematically shows the illumination device 1000 of the first embodiment.
- the top view of FIG. 2 schematically shows the arrangement of the light emitting diode 1020, the photodiode 1021, and the object to be illuminated 1080.
- the illumination device 1000 includes a light emitting diode 1020, a photodiode 1021, and a support structure 1022.
- the light emitting diode 1020 emits light 1040.
- the light 1040 includes a first light beam 1060, a second light beam 1061, and a remaining light beam 1062.
- the first light beam 1060 is directly guided to the object to be illuminated 1080 and becomes illumination light.
- the second light bundle 1061 is directly guided to the photodiode 1021.
- the zenith angle ⁇ 2 in the traveling direction of the second light bundle 1061 is the same as the zenith angle ⁇ 1 in the traveling direction of the first light bundle 1060.
- the azimuth angle ⁇ 2 in the traveling direction of the second light beam 1061 is different from the azimuth angle ⁇ 1 in the traveling direction of the first light beam 1060.
- the zenith angles ⁇ 1 and ⁇ 2 indicate angles formed with the reference axis 1100.
- the azimuth angles ⁇ 1 and ⁇ 2 indicate the rotation angle around the reference axis 1100.
- the divergence angle of the first light beam 1060 is set small in both the zenith angle direction and the azimuth angle direction, and is preferably set to 2 ° or less.
- the divergence angle of the first light beam 1060 may be set larger in both or one of the zenith angle direction and the azimuth angle direction.
- the divergence angle of the second light beam 1061 is set to be the same as the divergence angle of the first light beam 1060 in the zenith angle direction.
- the divergence angle of the second beam bundle 1061 may be set larger or smaller than the divergence angle of the first beam bundle 1060 in the azimuth direction, or set to be the same as the divergence angle of the first beam bundle 1060. May be.
- the light emitting diode 1020 may be replaced with another type of light source.
- the light emitting diode 1020 may be replaced with a halogen lamp, a xenon lamp, or the like.
- the photodiode 1021 detects the intensity of the second light beam 1061 and outputs an electrical signal corresponding to the intensity of the second light beam 1061.
- the zenith angle ⁇ 2 is the same as the zenith angle ⁇ 1. For this reason, the intensity of the second light bundle 1061 varies with time in the same manner as the intensity of the first light bundle 1060. From the photodiode 1021, an index that appropriately reflects the intensity of the first light beam 1060 guided to the object to be illuminated 1080 is obtained.
- the intensity of the second light bundle 1061 does not change with time as is the case with the intensity of the first light bundle 1060.
- the intensity of the first light bundle 1060 is monotonous as shown in the graph showing the temporal change in the intensity of the light bundle in FIG.
- the intensity of the second light beam 1061 increases once and then decreases more rapidly than the intensity of the first light beam 1060.
- FIG. 3 shows the temporal change in the intensity of the light beam from when the light emitting diode 1020 is turned on until about 0.1 second elapses.
- the photodiode 1021 may be replaced with another type of photodetector.
- the photodiode 1021 may be replaced with a photoresistor, a photomultiplier tube, or the like.
- the first light beam 1060 is guided to the object to be illuminated 1080 and becomes illumination light.
- the second light beam 1061 is guided to the photodiode 1021.
- the support structure 1022 supports the light emitting diode 1020 and the photodiode 1021 in a position and posture where the first light bundle 1060 and the second light bundle 1061 are guided in this way.
- the lighting device 1000 may include components other than these components.
- an optical system that converges, diverges, reflects, or refracts both or one of the first light bundle 1060 and the second light bundle 1061 may be provided.
- the optical system includes a lens, a prism, a mirror, an optical fiber, and the like.
- FIG 4 schematically shows the light distribution of the light-emitting diode 1020.
- the light distribution of the light emitting diode 1020 is an axially symmetric light distribution (rotationally symmetric light distribution).
- the light distribution of the light emitting diode 1020 may be a symmetric light distribution other than the axial symmetric light distribution.
- the light distribution of the light emitting diode 1020 may be a two-plane symmetric light distribution, a one-plane symmetric light distribution, or the like.
- Axisymmetric light distribution is a light distribution that can be expressed by rotating a polar coordinate light distribution curve in a plane including a rotation axis around the rotation axis, as described in Japanese Industrial Standard (JIS) Z8113.
- JIS Japanese Industrial Standard
- the reference axis 1100 is the rotation axis.
- the azimuth angles ⁇ 1 and ⁇ 2 may be set in any way.
- the symmetrical light distribution is a light distribution having one symmetry axis or at least one symmetry plane.
- the reference axis 1100 is a symmetric axis, or a plane including the reference axis 1100 is a symmetric plane.
- the azimuth angles ⁇ 1 and ⁇ 2 are preferably set such that the traveling direction of the first light bundle 1060 and the traveling direction of the second light bundle 1061 are the symmetry axis or the It is set to be symmetric with respect to the symmetry plane.
- the two-plane symmetrical light distribution is a light distribution that is regarded as symmetric with respect to each of two planes that include the reference axis and are orthogonal to each other, and is not rotationally symmetric.
- the azimuth angles ⁇ 1 and ⁇ 2 are preferably set so that the traveling direction of the first light bundle 1060 and the traveling direction of the second light bundle 1061 are the two. It is set to be symmetric with respect to the surface.
- the one-plane symmetric light distribution is regarded as symmetric with respect to one plane including the reference axis, and is a light distribution that is not rotationally symmetric or two-plane symmetric.
- the azimuth angles ⁇ 1 and ⁇ 2 are preferably set so that the traveling direction of the first light bundle 1060 and the traveling direction of the second light bundle 1061 are the one plane. Is set to be symmetric.
- the light emitting diode 1020 has a light distribution with the reference axis 1100 as a symmetry axis or a light distribution with a plane including the reference axis 1100 as a symmetry plane.
- the second embodiment relates to a lighting device.
- FIG. 5 is a perspective view
- FIG. 6 is a top view
- FIG. 7 is a cross-sectional view schematically illustrating an illumination device 2000 according to the second embodiment.
- the perspective view of FIG. 8 schematically shows the arrangement of the light emitting diode 2020, the photodiode 2021, the shielding plate 2022, the cylindrical mirror 2023, and the object to be illuminated 2120.
- the illumination device 2000 includes a light emitting diode 2020, a photodiode 2021, a shielding plate 2022, a cylindrical mirror 2023, and a housing 2024.
- the shielding plate 2022 includes an inner peripheral side plate 2040, an outer peripheral side plate 2041, and a connecting piece 2042.
- the housing 2024 includes a cylindrical object 2060 and a lid-like object 2061.
- the lighting device 2000 may include components other than these components.
- the illumination device 2000 illuminates the sample surface with illumination light incident on the sample surface from a direction that forms 45 ° with a reference axis (normal line) that passes through the center of the sample surface, and from the sample surface in a direction that forms 0 ° with the reference axis. It can be employed in a reflection characteristic measuring apparatus that receives reflected light to be emitted and conforms to a so-called 45 °: 0 ° geometry standard.
- the light emitting diode 2020 emits light 2080.
- the light distribution of the light emitting diode 2020 is the same as the light distribution of the light emitting diode 1020 of the first embodiment.
- the light 2080 includes a first light bundle 2100, a second light bundle 2101, and a remaining light bundle 2102.
- the first light bundle 2100 is guided to the illumination object 2120 and becomes illumination light.
- the second light bundle 2101 is guided to the photodiode 2021.
- the remaining beam bundle 2102 is shielded by the shielding plate 2022 and the like.
- the zenith angle ⁇ 2 in the traveling direction of the second light bundle 2101 is the same as the zenith angle ⁇ 1 in the traveling direction of the first light bundle 2100.
- the azimuth angle ⁇ 2 in the traveling direction of the second light beam 2101 is different from the azimuth angle ⁇ 1 in the traveling direction of the first light beam 2100.
- the lighting device 2000 is a ring lighting device.
- the divergence angle of the first light beam 2100 is set small in the zenith angle direction, and is preferably set to 2 ° or less.
- the divergence angle of the first light bundle 2100 is set to be small in the zenith angle direction, the variation in the incident angle at which the light beam actually enters the incident angle determined by the standard is reduced.
- the divergence angle of the first light beam 2100 is set large in the azimuth direction.
- the divergence angle of the second light beam 2101 is set to be the same as the divergence angle of the first light beam 2100 in the zenith angle direction, and is set larger than the divergence angle of the first light beam 2100 in the azimuth angle direction.
- the divergence angle of the first light beam 2100 is preferably set smaller than the divergence angle of the first light beam 2100.
- the divergence angle of the second light bundle 2101 is set small in the azimuth direction and the divergence angle of the first light bundle 2100 is set large in the azimuth direction, more light is incident on the illuminated surface.
- the light emitting diode 2020 may be replaced with another type of light source.
- the light emitting diode 2020 may be replaced with a halogen lamp, a xenon lamp, or the like.
- Each of the photodiodes 2021 detects the intensity of the second light beam 2101 and outputs an electric signal corresponding to the intensity of the second light beam 2101.
- the zenith angle ⁇ 2 is the same as the zenith angle ⁇ 1. For this reason, the intensity of the second light bundle 2101 changes with time in the same manner as the intensity of the first light bundle 2100. From the photodiode 2021, an index that appropriately reflects the intensity of the first light beam 2100 guided to the object to be illuminated 2120 is obtained.
- the photodiode 2021 may be replaced with another type of photodetector.
- the photodiode 2021 may be replaced with a photoresistor, a photomultiplier tube, or the like.
- the number of photodiodes 2021 may be increased or decreased.
- annular slit 2140 is formed in the shielding plate 2022.
- Each of the annular slits 2140 is a hole extending along the circumference of a circle having a center on the reference axis 2130 and having a length longer than the width.
- the width is the size of the circle in the radial direction.
- the length is the size of the circle in the circumferential direction.
- the circular slit 2140 may be replaced with a hole having a shape that is difficult to call a “circular slit”.
- the annular slit 2140 may be replaced with a set of a large number of round holes arranged in the circumferential direction of the circle.
- the inner peripheral side plate 2040 is on the inner peripheral side from the annular slit 2140.
- the outer peripheral plate 2041 is on the outer peripheral side with respect to the annular slit 2140.
- the connecting piece 2042 connects the inner peripheral side plate 2040 and the outer peripheral side plate 2041. By the connecting piece 2042, the inner peripheral side plate 2040 and the outer peripheral side plate 2041 are integrated, and the shielding plate 2022 is easily supported.
- the shielding plate 2022 may be replaced with a shielding object having a shape difficult to call a “shielding plate”.
- the annular slit 2140 and the connecting piece 2042 are alternately arranged in the circumferential direction of the circle.
- the number of the annular slits 2140 may be increased or decreased.
- the number of connecting pieces 2042 is increased or decreased in accordance with the number of annular slits 2140.
- the stray light is less likely to be guided to the object to be illuminated 2120 by the shielding plate 2022.
- An index that appropriately reflects the intensity of the light beam guided to the object to be illuminated 2120 is obtained from the photodiode 2021.
- Each of the cylindrical mirrors 2023 has an inner peripheral reflection surface 2160.
- Each of the inner peripheral reflection surfaces 2160 extends along a cylindrical surface of a cylinder having a cylindrical axis on the reference axis 2130.
- the whole or a part of the cylindrical mirror 2023 may be replaced with another type of optical system.
- all or part of the cylindrical mirror 2023 may be replaced with a prism.
- the cylindrical mirror 2023 may be replaced with a reflection mechanism having a plurality of planar reflection surfaces.
- the reflecting mechanism may be a plurality of planar reflecting mirrors each having one planar reflecting surface, or may be a polyhedral mirror having a plurality of connected planar reflecting surfaces.
- FIG. 9 schematically shows a polyhedral mirror.
- the polyhedral mirror 2300 has 16 plane reflecting surfaces 2310.
- the number of planar reflecting surfaces 2310 may be increased or decreased.
- the 16 planar reflecting surfaces 2310 are circumferentially arranged around the reference axis 2130 in the circumferential direction 2320. Are arranged in a distributed manner and face the radially inward direction 2322.
- the first light bundle 2100 is guided from the light emitting diode 2020 to the object 2120 via the annular slit 2140 and the inner reflection surface 2160, and becomes illumination light.
- the first light bundle 2100 is reflected by the inner peripheral reflection surface 2160.
- the second light bundle 2101 is guided directly to the photodiode 2021.
- the first light beam 2100 moves away from the reference axis 2130 while proceeding in the direction in which the reference axis 2130 extends.
- the first light bundle 2100 approaches the reference axis 2130 and converges on the object to be illuminated 2120 while proceeding in the direction in which the reference axis 2130 extends.
- the to-be-illuminated object 2120 is illuminated from various azimuth angles. The illuminated object 2120 is illuminated uniformly, and the influence of the distance from the illumination device 2000 to the illuminated object 2120 is reduced.
- the light emitting diode 2020, the photodiode 2021, the shielding plate 2022, and the cylindrical mirror 2023 are supported by the housing 2024 at the positions and postures where the first light bundle 2100 and the second light bundle 2101 are guided in this way.
- the light emitting diode 2020 is fixed to the inner surface 2180 of the lid-like object 2061.
- the photodiode 2021 is fixed to the inner peripheral surface 2190 of the cylindrical object 2060 via the shielding plate 2022.
- the shielding plate 2022 and the cylindrical mirror 2023 are fixed to the inner peripheral surface 2190 of the cylindrical object 2060.
- One end 2200 of the cylindrical object 2060 is closed with a lid-shaped object 2061.
- the other end 2201 of the cylindrical object 2060 is opened and becomes an exit for illumination light.
- the light emitting diode 2020, the photodiode 2021, the shielding plate 2022, and the cylindrical mirror 2023 are accommodated in the housing 2024.
- the housing 2024 may be replaced with
- the light emitting diode 2020 and the photodiode 2021 are disposed above the shielding plate 2022.
- the cylindrical mirror 2023 and the object to be illuminated 2120 are disposed below the shielding plate 2022.
- the upper part may be the upper part in the vertical direction or may not be the upper part in the vertical direction. All or part of the photodiode 2021 may be moved below the shielding plate 2022. For example, as shown in FIG. 10, one photodiode 2021 may be moved to a gap between adjacent cylindrical mirrors 2023.
- the second light bundle 2101 in order to prevent the second light bundle 2101 from being shielded by the connecting piece 2042, that is, the second light bundle 2101 is guided from the photodiode 2021 to the photodiode 2021 via the annular slit 2140. Therefore, a part of the contact piece 2042 is omitted.
- the upper surface 2220 of the contact piece 2042 is on the light emitting diode 2020 side.
- Photodiode 2021 is coupled to upper surface 2220 of connecting piece 2042.
- the intensity of the light bundle that travels toward the connecting piece 2042 necessary to integrate the inner peripheral plate 2040 and the outer peripheral plate 2041 that is, the intensity of the light bundle that cannot be used as illumination light, is applied to the photodiode 2021. Detected. Light 2080 emitted from the light emitting diode 2020 is efficiently used.
- the photodiode 2021 may not be coupled to the upper surface 2220 of the connecting piece 2042.
- the photodiode 2021 is coupled to the inner surface 2180 of the lid 2061
- the mirror is coupled to the upper surface 2220 of the connecting piece 2042
- the second light beam 2101 is guided from the light emitting diode 2020 to the photodiode 2021 via the mirror. It is allowed to be.
- the third embodiment relates to a multi-angle colorimeter.
- FIG. 11 is a block diagram schematically showing a multi-angle colorimeter 3000 according to the third embodiment.
- the block diagram of FIG. 12 schematically shows the control calculation unit 3023.
- the multi-angle colorimeter 3000 is a unidirectional illumination / multidirectional light-receiving colorimeter.
- illumination is performed from one direction, reflected light from multiple directions in an illuminated object is received, and the received reflected light is spectroscopically measured.
- the multi-angle colorimeter 3000 may be replaced with another type of reflection characteristic measuring device.
- the multi-angle colorimeter 3000 may be replaced with a multidirectional illumination / one-way light receiving type colorimeter, a normal colorimeter, or the like.
- a multidirectional illumination / one-way light receiving colorimeter illumination is performed from multiple directions, reflected light in one direction from an object to be illuminated is received, and the received reflected light is spectroscopically measured.
- illumination is performed from one direction, reflected light in one direction from an illuminated object is received, and the received reflected light is spectroscopically measured.
- the multi-angle colorimeter 3000 includes an illumination mechanism 3020, a light receiving mechanism 3021, a spectroscopic measurement mechanism 3022, and a control calculation unit 3023.
- the light receiving mechanism 3021 includes a bundle fiber 3040 and a shutter 3041.
- the control calculation unit 3023 includes a spectroscopic measurement control unit 3060 and a correction unit 3061.
- the illumination mechanism 3020 includes the illumination device 1000 of the first embodiment.
- the illumination device 1000 of the first embodiment may be replaced with the illumination device 2000 of the second embodiment.
- the light receiving mechanism 3021 receives the reflected light 3100 from the illumination object 3080 at a plurality of light receiving angles (normal angle) and guides it to the spectroscopic measurement mechanism 3022.
- the light receiving mechanism 3021 may be omitted, and the reflected light 3100 from the illumination object 3080 may be directly guided to the spectroscopic measurement mechanism 3022.
- the number of light receiving angles may be increased or decreased.
- the spectroscopic measurement mechanism 3022 spectroscopically measures the reflected light 3100 that has been guided.
- the reflected light 3100 is spectrally separated by a wavelength dispersion element such as a diffraction grating or a prism, and a change in light intensity due to the wavelength is detected by a sensor array or the like to obtain a spectral spectrum.
- the spectroscopic measurement method may be changed.
- the control calculation unit 3023 controls the illumination mechanism 3020, the light receiving mechanism 3021, and the spectroscopic measurement mechanism 3022, and calculates the measurement result.
- the function of the control calculation unit 3023 is realized by causing an embedded computer to execute a control program. All or some of the functions of the control calculation unit 3023 may be realized by hardware that does not execute a program.
- the hardware is, for example, an electronic circuit including an operational amplifier, a comparator, a logic circuit, and the like.
- the spectroscopic measurement control unit 3060 controls the illumination mechanism 3020, the light receiving mechanism 3021, and the spectroscopic measurement mechanism 3022.
- the spectroscopic measurement control unit 3060 controls the illumination mechanism 3020 to illuminate the object 3080 to be illuminated. Further, the spectroscopic measurement control unit 3060 controls the shutter 3041 to open the incident light entrance angle 3120 at which the measurement is performed and close the remaining light incident holes 3120 among the plurality of light incident ports 3120 of the bundle fiber 3040. Further, the spectroscopic measurement control unit 3060 controls the spectroscopic measurement mechanism 3022 to cause the spectroscopic measurement mechanism 3022 to perform spectroscopic measurement, and acquires the measurement result from the spectroscopic measurement mechanism 3022. The spectroscopic measurement control unit 3060 acquires the detection result of the photodiode 1021 when spectroscopic measurement is performed. The spectroscopic measurement control unit 3060 performs these measurement controls for all the light receiving angles.
- the correction unit 3061 corrects the measurement result of the spectroscopic measurement mechanism 3022 using the detection result of the photodiode 1021. In this correction, the influence of the temporal variation of the intensity of the illumination light (first light bundle) is eliminated. For example, when the intensity of the detected second light bundle is I and the reference value of the intensity of the second light bundle is I0, the light intensity in the result of the spectroscopic measurement is multiplied by I0 / I. Thereby, the intensity of light in the result of spectroscopic measurement is normalized, and spectroscopic measurement is performed accurately.
- the time required for the spectroscopic measurement is shortened.
- This advantage is particularly significant in the unidirectional illumination / multidirectional light receiving multi-angle colorimeter 3000 in which the spectroscopic measurement must be repeated for a large number of light receiving angles.
- the unidirectional illumination / multidirectional light receiving type multi-angle colorimeter 3000 that must repeat spectroscopic measurement for a large number of light receiving angles is susceptible to fluctuations in the intensity of the illumination light. The advantage of this correction to mitigate the effect becomes particularly significant.
- the fourth embodiment relates to a light emitting diode unit that replaces the light emitting diode constituting the illumination mechanism of the third embodiment.
- FIG. 13 is a cross-sectional view schematically showing a light emitting diode unit 4000 of the fourth embodiment.
- the light emitting diode unit 4000 includes a light emitting diode 4010, an exterior 4011, a substrate 4012, a lens 4013, and an electrode 4014.
- the light emitting diode 4010 is mounted on the inclined region 4030 of one main surface 4020 of the substrate 4012.
- the inclined region 4030 is inclined by an angle ⁇ with respect to the flat region 4031 of one main surface 4020 of the substrate 4012.
- the reference axis 4040 of the light emitting diode 4010 extends in a direction that forms an angle ⁇ with the direction in which the normal line of the flat region 4031 extends.
- the power supply electrode of the light emitting diode 4010 is electrically connected to the wiring pattern exposed in the inclined region 4030.
- the light distribution of the light emitting diode 4010 has an axially symmetric orientation in which the reference axis 4040 is an axis of symmetry.
- the light emitting diode 4010 preferably has a vertical light distribution characteristic according to Lambert's cosine law.
- the exterior 4011 is mounted on one main surface 4020 of the substrate 4012.
- a space 4050 is formed in the exterior 4011.
- the space 4050 is defined on the inner surface 4060 of the exterior 4011 and is exposed to the outside of the exterior 4011 at the opening 4070 of the exterior 4011.
- An end surface 4080 of the exterior 4011 along the outer periphery of the opening 4070 is fixed to a fixed region 4090 of one main surface 4020 of the substrate 4012 surrounding the light emitting diode 4010. Accordingly, the opening 4070 is closed by one main surface 4020 of the substrate 4012, and the light emitting diode 4010 is arranged in a space 4050 surrounded by the inner surface 4060 and the one main surface 4020 of the substrate 4012.
- a hole 4100 and a hole 4101 are formed in the exterior 4011. Each of the hole 4100 and the hole 4101 communicates the space 4050 and the outside of the exterior 4011.
- the hole 4100 is in a direction that forms an angle ⁇ with the reference axis 4040 when viewed from the light emitting diode 4010.
- the hole 4101 is in a direction that forms an angle ⁇ with the reference axis 4040 when viewed from the light emitting diode 4010.
- the hole 4101 is on the opposite side of the hole 4100 with respect to the reference axis 4040.
- the exterior 4011 has a light shielding property.
- the exterior 4011 is preferably a resin molded body, and more preferably integrally molded.
- the inner surface 4060 is preferably subjected to a process for reducing the reflectance. When the inner surface 4060 is processed to reduce the reflectance, stray light is suppressed.
- the hole 4100 is closed by the lens 4013.
- the electrode 4014 is provided on the other main surface 4021 of the substrate 4012.
- the electrode 4014 is electrically connected to the power feeding electrode of the light emitting diode 4010 through a wiring pattern.
- the power supplied to the electrode 4014 is supplied to the power supply electrode of the light emitting diode 4010 via the wiring pattern.
- the light emitting diode 4010 emits light 4110.
- the light 4110 includes a first light beam 4120, a second light beam 4121, and a remaining light beam 4122.
- the first light bundle 4120 is guided to the object to be illuminated through the hole 4100 and the lens 4013, and becomes illumination light.
- the first light bundle 4120 is collected by the lens 4013.
- the second light bundle 4121 is guided to the photodiode 1021 through the hole 4101.
- the remaining light beam 4122 is shielded by the exterior 4011.
- the first light beam 4120 travels in a direction that forms an angle ⁇ with the reference axis 4040.
- the second light beam 4121 travels in a direction that forms an angle ⁇ with the reference axis 4040.
- the traveling direction of the first light beam 4120 is on the side opposite to the second light beam 4121 with respect to the reference axis 4040.
- the second light bundle 4121 may be guided from the hole 4101 to the photodiode 1021 by the optical fiber 4130 as shown in FIG.
- the incident end 4140 of the optical fiber 4130 is connected to the hole 4101, and the photodiode 1021 is disposed at the output end 4141 of the optical fiber 4130.
- a photodiode 4150 instead of the photodiode 1021 may be installed in the hole 4101.
- SYMBOLS 1000 Illuminating device 1020 Light emitting diode 1021 Photodiode 1022 Support structure 2000 Illuminating device 2020 Light emitting diode 2021 Photodiode 2022 Shielding plate 2023 Cylindrical mirror 2024 Housing 2040 Inner side plate 2041 Outer side plate 2042 Connection piece 2300 Polyhedral mirror 4010 Light emitting diode 4011 Exterior 4140 Photodiode
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Spectrometry And Color Measurement (AREA)
Abstract
Description
第1実施形態は、照明装置に関する。
第2実施形態は、照明装置に関する。
第3実施形態は、マルチアングル測色計に関する。
第4実施形態は、第3実施形態の照明機構を構成する発光ダイオードを置き換える発光ダイオードユニットに関する。
1020 発光ダイオード
1021 フォトダイオード
1022 支持構造
2000 照明装置
2020 発光ダイオード
2021 フォトダイオード
2022 遮蔽板
2023 円筒ミラー
2024 ハウジング
2040 内周側の板
2041 外周側の板
2042 連絡片
2300 多面体鏡
4010 発光ダイオード
4011 外装
4140 フォトダイオード
Claims (7)
- 光を放射し、基準軸を有し、前記基準軸が対称軸となる配光分布又は前記基準軸を含む面が対称面となる配光分布を有し、前記光が第1の光線束及び第2の光線束を有し、前記第1の光線束の進行方向が前記基準軸と第1の角度をなし、前記第2の光線束の進行方向が前記基準軸と第2の角度をなし、前記第2の角度が前記第1の角度と同じである光源と、
前記第2の光線束の強度を検出する光検出器と、
前記第1の光線束が被照明物に導かれ前記第2の光線束が前記光検出器に導かれる位置及び姿勢で前記光源及び前記光検出器を支持する支持構造と、
を備える照明装置。 - 孔が形成された遮蔽物、
をさらに備え、
前記支持構造は、前記第1の光線束が前記光源から前記孔を経由して前記被照明物に導かれる位置及び姿勢で前記遮蔽物を支持する
請求項1の照明装置。 - 光学系
をさらに備え、
前記遮蔽物が遮蔽板であり、前記孔が円環スリットであり、
前記支持構造は、前記第1の光線束が前記光源から前記円環スリット及び前記光学系を経由して前記被照明物に導かれる位置及び姿勢で前記光学系を支持する
請求項2の照明装置。 - 前記光学系は、
前記第1の光線束を反射する内周反射面を有する円筒ミラー
を備える請求項3の照明装置。 - 前記光学系は、
前記第1の光線束を反射する複数の平面反射面を有する反射機構
を備える請求項3の照明装置。 - 前記遮蔽板は、
前記円環スリットより内周側にある内周側の板と、
前記円環スリットより外周側にある外周側の板と、
前記内周側の板及び前記外周側の板を連絡し、前記光源の側にある主面を有し、前記光検出器が前記主面に結合される連絡片と、
を備える請求項3から請求項5までのいずれかの照明装置。 - 請求項1から請求項6までのいずれかの照明装置と、
前記被照明物からの反射光を分光測定する分光測定機構と、
前記光検出器の検出結果を用いて前記第1の光線束の強度の時間変動の影響を解消する補正を前記分光測定機構の測定結果に行う補正部と、
を備える反射特性測定装置。
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US14/894,821 US9429472B2 (en) | 2013-05-29 | 2014-05-15 | Illumination device and reflection characteristic measuring device |
EP14803475.4A EP3006910A4 (en) | 2013-05-29 | 2014-05-15 | Illumination device and reflection-characteristics measurement device |
JP2014543713A JP5686230B1 (ja) | 2013-05-29 | 2014-05-15 | 照明装置及び反射特性測定装置 |
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JP2013-112846 | 2013-05-29 | ||
JP2013112846 | 2013-05-29 |
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WO2014192554A1 true WO2014192554A1 (ja) | 2014-12-04 |
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PCT/JP2014/062962 WO2014192554A1 (ja) | 2013-05-29 | 2014-05-15 | 照明装置及び反射特性測定装置 |
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US (1) | US9429472B2 (ja) |
EP (1) | EP3006910A4 (ja) |
JP (1) | JP5686230B1 (ja) |
WO (1) | WO2014192554A1 (ja) |
Cited By (2)
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WO2016093131A1 (ja) * | 2014-12-10 | 2016-06-16 | コニカミノルタ株式会社 | 照明装置及び反射特性測定装置 |
WO2016093130A1 (ja) * | 2014-12-10 | 2016-06-16 | コニカミノルタ株式会社 | 照明装置及び反射特性測定装置 |
Families Citing this family (2)
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CN109520299B (zh) * | 2018-09-29 | 2019-12-24 | 浙江省海洋水产研究所 | 石墨炉原子吸收光谱仪照明装置及方法 |
CN109506777B (zh) * | 2018-09-29 | 2020-07-17 | 浙江省海洋水产研究所 | 原子吸收光谱仪照明装置及方法 |
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Also Published As
Publication number | Publication date |
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EP3006910A1 (en) | 2016-04-13 |
US9429472B2 (en) | 2016-08-30 |
JPWO2014192554A1 (ja) | 2017-02-23 |
JP5686230B1 (ja) | 2015-03-18 |
EP3006910A4 (en) | 2017-02-08 |
US20160109293A1 (en) | 2016-04-21 |
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