WO2014020660A1 - 光学測定装置 - Google Patents
光学測定装置 Download PDFInfo
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- WO2014020660A1 WO2014020660A1 PCT/JP2012/069322 JP2012069322W WO2014020660A1 WO 2014020660 A1 WO2014020660 A1 WO 2014020660A1 JP 2012069322 W JP2012069322 W JP 2012069322W WO 2014020660 A1 WO2014020660 A1 WO 2014020660A1
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- light
- light source
- axis
- cylindrical member
- drum
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- 230000003287 optical effect Effects 0.000 title claims abstract description 77
- 238000005259 measurement Methods 0.000 title claims abstract description 58
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 230000001902 propagating effect Effects 0.000 claims description 2
- 238000012545 processing Methods 0.000 description 17
- 230000004048 modification Effects 0.000 description 11
- 238000012986 modification Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 230000032683 aging Effects 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 1
- 230000002431 foraging effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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Classifications
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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
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/06—Restricting the angle of incident light
-
- 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
- G01J1/0223—Sample holders for photometry
-
- 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
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0403—Mechanical elements; Supports for optical elements; Scanning arrangements
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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
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
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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
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0488—Optical or mechanical part supplementary adjustable parts with spectral filtering
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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
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J2001/4247—Photometry, e.g. photographic exposure meter using electric radiation detectors for testing lamps or other light sources
Definitions
- the present invention relates to an optical measurement device for detecting light emitted from a light source in association with an irradiation angle.
- the light emission characteristic is known as an index for evaluating the performance of a light source.
- a typical example of such radiation characteristics is light distribution characteristics.
- the light distribution characteristic means a change or distribution with respect to an angle of luminous intensity.
- both absolute luminous intensity and relative luminous intensity are used.
- the light distribution characteristic of the absolute luminous intensity is used when obtaining the total luminous flux generated by the light source.
- the light distribution characteristic of relative luminous intensity is used when obtaining a light distribution pattern.
- Patent Document 1 Japanese Patent Application Laid-Open No. 07-294328
- Patent Document 2 Japanese Patent Application Laid-Open No. 2003-247888
- JIS C8105-5 2011 “Lighting fixtures—Part 5: Light distribution measurement method” (Non-Patent Document 1) is defined in Japanese Industrial Standards.
- a configuration is adopted in which light emitted from the light source is guided to a light receiver by rotating a plane mirror.
- the light source to be measured is arranged to be rotatable along the vertical axis
- the plane mirror is arranged to be rotatable along the horizontal axis.
- Light distribution measuring devices are mainly classified into two types. One is a method in which the plane mirror rotates at the center and the light source rotates around it (hereinafter also referred to as “Moving Sample method”), and the other is a method in which the plane mirror rotates around the light source (hereinafter “Moving Mirror method”). Is also written.).
- the Moving Sample system is configured such that the line connecting the center of the plane mirror and the light receiver coincides with the rotation axis of the plane mirror.
- the line connecting the photometric center of the light source and the light receiver coincides with the rotation axis of the plane mirror. With this method, the photometric distance cannot be changed.
- JIS C8105-5 2011 "Lighting fixtures-Part 5: Light distribution measurement method", Japan Standards Association, established on December 20, 2011
- the above Moving Sample method has an advantage in measurement because the optical axis from the plane mirror to the light receiver is invariant.
- the light source moves through the space during the measurement, there is a problem that the characteristics are not stable when measuring a light source such as a discharge lamp whose characteristics change depending on the posture or an LED lighting apparatus whose characteristics change depending on the ambient temperature.
- the Moving Mirror method has the advantage that the ambient temperature can be kept constant because the plane mirror moves around the light source and the light source itself does not move, and the characteristics of the light source during measurement can be stabilized.
- the optical axis from the plane mirror to the light receiver changes, there is a problem that it is easily affected by the light reception angle characteristics of the light receiver and a problem that it is difficult to take measures against stray light.
- An object of the present invention is to provide a novel optical measurement device for detecting light emitted from a light source in association with an irradiation angle, which is different from the configuration and method disclosed in the prior art as described above. .
- an optical measurement device for detecting light emitted from a light source in association with an irradiation angle.
- the optical measurement apparatus has a hollow cylindrical member having a first opening on one plane and a second opening on the other plane, and a first axis that is a central axis of the cylindrical member.
- a first reflecting portion that is disposed inside the cylindrical member and reflects light incident from the light source through the first opening, and reflects the light inside the cylindrical member, and the light Through the second opening, the second reflecting portion for propagating the cylindrical member to the outside of the cylindrical member, and the light reflected by the first reflecting portion is incident on the second reflecting portion.
- at least one third reflecting portion is provided.
- the support portion is configured to be capable of rotating the light source along a second axis orthogonal to the first axis.
- the rotation mechanism includes a roller that rotatably supports the cylindrical member.
- the optical measurement device further includes a light receiving unit disposed on the first axis.
- the support unit includes an arm for supporting the plurality of light sources, and means for sequentially switching the light sources arranged at the measurement position by rotating the arms.
- the third reflection unit includes a plurality of reflection units arranged to guide light from the light source in a direction orthogonal to the first axis.
- the third reflecting portion is configured to circulate light from the light source at least partially around the first axis.
- FIG. 10 is a cross-sectional view taken along line XX in FIG. 9.
- Optical measurement apparatus 1 detects light emitted from a light source to be measured in association with an irradiation angle. More specifically, the optical measurement device 1 acquires the spatial distribution of the light intensity of the light source by measuring the light intensity at a plurality of positions in a spatial coordinate system centered on the light source.
- the example which measures the light distribution characteristic of a light source is demonstrated as a typical example of a light emission characteristic.
- FIG. 1 is a side sectional view of an optical measuring device 1 according to an embodiment of the present invention.
- FIG. 2 is a perspective view showing an overall configuration of optical measurement apparatus 1 according to the embodiment of the present invention.
- 3 is a cross-sectional view taken along line III-III in FIG.
- the optical measuring device 1 includes a hollow drum 2.
- the light source 30 is arranged and lit on one plane (bottom surface) side of the drum 2 and light from the light source 30 is received by the light receiving unit 6 disposed on the other plane (bottom surface) side of the drum 2.
- the luminous intensity of the light source 30 is measured.
- the drum 2 has a light source window 10 that is an opening for placing the light source 30 on one plane (bottom surface), and an observation window 18 that is an opening for extracting light from the light source 30 on the other plane (bottom surface).
- the drum 2 rotates about the X axis and the light source 30 rotates about the Y axis, so that the light emitted from the light source 30 is measured for each irradiation angle.
- the drum 2 is disposed so as to be rotatable along an X axis that is a central axis (coincidence with the optical axis AX1) of the drum 2. That is, the optical measuring device 1 includes a rotation mechanism for rotating the drum 2 along its central axis.
- the rotation angle about the X axis of the drum 2 is ⁇ .
- the rotation angle ⁇ is defined in a range of ⁇ 180 ° ⁇ ⁇ ⁇ 180 ° with a predetermined initial state as a reference (0 °). However, in practice, it is often sufficient to measure in the range of ⁇ 90 ° ⁇ ⁇ ⁇ 90 °.
- a light source support 20 is disposed in association with the light source window 10 of the drum 2.
- the light source support unit 20 arranges the light source 30 at a predetermined position and supplies power to turn on the light source 30.
- the center of the light emitting surface of the light source 30 is positioned on the central axis (optical axis AX1) of the drum 2. That is, the light source support unit 20 arranges the light source 30 on the central axis of the drum 2 and at a position (measurement position) where irradiated light enters the inside of the drum 2 through the light source window 10.
- the light source 30 is supported by the arm 22 of the light source support unit 20, and the arm 22 is rotatable along the Y axis.
- the light source 30 is rotated along the Y axis as necessary. That is, the light source support unit 20 is configured to be able to rotate the light source 30 along the Y axis that is orthogonal to the central axis of the drum 2.
- the rotation angle about the Y axis of the light source 30 by this light source support part 20 is set to ⁇ .
- the rotation angle ⁇ is defined in a range of ⁇ 180 ° ⁇ ⁇ ⁇ 180 ° with a predetermined initial state as a reference (0 °).
- plane mirrors 12, 14, and 16 are provided. Light from the light source 30 incident on the drum 2 is guided to the light receiving unit 6 through the plane mirror 12, the plane mirror 14, and the plane mirror 16. That is, three plane mirrors are fixed inside the drum 2, and the drum 2 rotates in a state where the light source 30 disposed on the central axis of the drum 2 is turned on. As the drum 2 rotates, the plane mirror 12 also rotates around the light source 30 and receives light from the light source 30 at each radiation angle. The plane mirrors 14 and 16 emit the reflected light from the plane mirror 12 from the rotation center (observation window 18) of the drum 2. The light receiving unit 6 receives light emitted from the drum 2.
- the plane mirror 12 reflects light from the light source 30 in a predetermined direction. Since the plane mirror 12 is fixed to the drum 2, it rotates along the X axis as the drum 2 rotates. Since the center of the light emitting surface of the light source 30 is located on the central axis of the drum 2, the distance from the light source 30 to the plane mirror 12 is kept constant regardless of the rotation angle of the drum 2. In other words, the light source 30 is always included in the field of view of the plane mirror 12 regardless of the rotation position of the drum 2. As described above, the optical measurement device 1 includes the plane mirror 12 that is disposed inside the drum 2 and reflects light incident from the light source 30 through the light source window 10.
- the plane mirror 14 is fixed in association with the observation window 18.
- the plane mirror 14 reflects the light inside the drum 2 and propagates the light to the outside of the drum 2 along the central axis (optical axis AX1) of the drum 2 through the observation window 18.
- the plane mirror 14 is configured to emit the reflected light toward the light receiving unit 6 regardless of the rotation position of the drum 2.
- the plane mirror 16 causes the light reflected by the plane mirror 12 to enter the plane mirror 14.
- the example shown in FIG. 1 shows a configuration in which one plane mirror 16 is arranged between the plane mirror 12 and the plane mirror 14, but a plurality of plane mirrors may be arranged.
- the light receiving unit 6 is disposed on the central axis (optical axis AX1) of the drum 2, and detects the light intensity emitted from the light source 30, that is, the light emitted from the drum 2.
- the light receiving unit 6 outputs a value indicating the luminous intensity (intensity) of the received light to the processing device 200.
- a device such as a photodiode that detects the intensity of light may be employed, or a spectral detector for detecting the intensity (spectrum) for each wavelength may be employed.
- the light receiving unit 6 includes a lens system for collecting light.
- the measurement of the light distribution characteristics by the optical measuring device 1 is performed in a darkroom.
- the photometric distance between the drum 2 and the light receiving unit 6 becomes long, stray light generated in any part of the optical path may be mixed. Such stray light causes measurement errors. Therefore, it is preferable to provide the light shielding plates 62 and 64 on the optical path between the drum 2 and the light receiving unit 6.
- the light shielding plates 62 and 64 limit the optical path (shaft diameter) of the light emitted from the drum 2, thereby preventing stray light from being mixed.
- the optical measuring device 1 includes a control unit 4 for controlling the rotation of the drum 2 and the rotation and lighting of the light source 30.
- the control unit 4 is connected to the processing device 200 and rotates the rollers 52 and 54 and the arm 22 in accordance with instructions from the processing device 200.
- the processing apparatus 200 stores the detection result (value indicating luminous intensity) by the light receiving unit 6 in association with the rotation angle ⁇ of the drum 2 and the rotation angle ⁇ of the light source support unit 20 at the time of detection. That is, processing device 200 stores a detection result for each combination of rotation angle ⁇ and rotation angle ⁇ .
- the stored detection result is the spatial distribution of the light intensity of the light source 30, that is, the light distribution characteristic.
- the optical measuring device 1 includes a rotation mechanism for rotating the drum 2 along its central axis. Any mechanism may be adopted as long as the drum 2 can be rotationally driven.
- the center part of the drum 2 and a motor may be mechanically connected, and the drum 2 may be rotated by rotational driving of the motor.
- rollers 52 and 54 for rotating and supporting the drum 2 are arranged, and the drum 2 is rotated by rotationally driving the rollers 52 and 54.
- the apparatus can be made compact.
- the power required for rotationally driving the drum 2 can be reduced as compared with the configuration in which the arm itself supporting the mirror and the arm itself supporting the light source are rotationally driven.
- the drive mechanism is on the outer peripheral side of the drum 2, the user can more easily access the light source 30.
- rollers 52 and 54 arranged at the lower part of the drum 2 support and rotate the drum 2, but the present invention is not limited to this.
- a driven roller that rotatably supports the drum 2 and a drive roller that rotationally drives the drum 2 may be disposed.
- FIG. 4 is a view showing a state in which the drum 2 shown in FIG. 1 is rotated by 90 ° along the X axis.
- FIG. 1 the state which measures the light irradiated vertically downward from the light source 30 is shown.
- FIG. 4 shows a state in which light irradiated from the light source 30 in the horizontal depth direction is measured.
- the component to be measured out of the light emitted from the light source 30 first enters the plane mirror 12, and then enters the light receiving unit 6 through the plane mirrors 14 and 16. To do.
- the optical path from the light source 30 to the light receiving unit 6 is maintained at the same optical distance regardless of the rotation position of the drum 2. Thereby, the light distribution characteristic of the light source 30 can be measured.
- FIG. 5 is a schematic diagram showing a hardware configuration of processing apparatus 200 according to the embodiment of the present invention.
- the processing device 200 is typically realized by a computer. Specifically, the processing device 200 temporarily stores a CPU (Central Processing Unit) 202 that executes various programs including an operating system (OS) and data necessary for the execution of the program by the CPU 202.
- a memory 212 and a hard disk (HDD: Hard Disk Drive) 210 that stores a program executed by the CPU 202 in a nonvolatile manner are included. Further, the hard disk 210 stores in advance a program for realizing processing relating to measurement of light distribution characteristics.
- a program is stored in a CD-ROM drive 214 by a CD-ROM (Compact Disk-Read Only). Memory) 214a or the like.
- the CPU 202 receives a program from a server device or the like via a network interface (I / F) 206 via a network and stores it in the hard disk 210.
- I / F network interface
- the CPU 202 receives the detection result detected by the light receiving unit 6 via an I / O (Input Output) unit 216 and gives various control commands to the optical measuring device 1.
- the CPU 202 receives an instruction from a user or the like via an input unit 208 such as a keyboard or a mouse, and outputs a light distribution characteristic calculated by executing the program to the display 204 or the like.
- a part or all of the functions installed in the processing apparatus 200 may be realized by dedicated hardware.
- FIG. 6 is a schematic diagram showing an electrical configuration of optical measurement apparatus 1 according to the embodiment of the present invention.
- optical measurement apparatus 1 further includes motors 72 and 74 that rotate and drive rollers 52 and 54, respectively, and motor 76 that rotates and drives arm 22 of light source support 20.
- motors 72, 74, 76 stepping motors capable of controlling the rotational position (phase) are preferable so that the rotational angle can be controlled with high accuracy.
- the control unit 4 further includes a communication interface (I / F) 40, motor drivers 42, 44, 46, and a light source driving unit 48 that supplies power for lighting the light source 30.
- the communication interface 40 decodes a control command from the processing device 200 and gives an internal command to the motor drivers 42, 44, 46 and the light source driving unit 48.
- the motor drivers 42, 44, 46 drive the motors 72, 74, 76 according to internal commands from the communication interface 40.
- the light source driving unit 48 generates power for turning on the light source 30 in accordance with an internal command from the communication interface 40.
- the control unit 4 Based on feedback signals (such as pulse signals) from the motors 72, 74, 76, the control unit 4 detects the rotation angle ⁇ of the drum 2 and the rotation angle ⁇ of the light source 30 and outputs the detected values to the processing device 200. May be.
- FIG. 7 is a schematic diagram showing an optical measurement apparatus 1A according to a first modification of the embodiment of the present invention.
- the optical measurement device 1A shown in FIG. 7 is different from the optical measurement device 1 shown in FIG. 1 in that a light source support portion 20A is arranged instead of the light source support portion 20. Since other configurations are the same as those of the optical measurement apparatus 1 shown in FIG. 1, detailed description will not be repeated.
- the light source support 20A can support and light a plurality of light sources 30 (two light sources 30 in the example shown in FIG. 7). More specifically, the light source support portion 20A has two arms 22-1 and 22-2, and the light source 30 can be attached to each arm. Further, the light source support portion 20A is rotatable along the Y axis, and the light sources 30 attached to the respective arms 22-1 and 22-2 are alternately arranged at the measurement positions. That is, the light source support unit 20A includes arms 22-1 and 22-2 for supporting a plurality of light sources 30, and the light sources 30 arranged at the measurement positions are rotated by rotating the arms 22-1 and 22-2. Switch sequentially. Three or more arms may be provided so that more light sources 30 can be aged in parallel.
- a plurality of light sources 30 can be turned on simultaneously. That is, while one light source 30 is turned on and measurement is performed, the other light source 30 can be turned on for aging. Since light between the arm 22-1 and the arm 22-2 is shielded by the dark screen 70 or the like, the light emitted from the light source 30 during aging does not cause a measurement error.
- the measurement of the radiation characteristic of one light source 30 and the aging of another light source 30 can be performed in parallel, so that the measurement waiting time due to the aging time can be shortened.
- the time required for replacing the light source 30 arranged at the measurement position can be shortened.
- the photometric distance (the distance from the light source 30 to the light receiving unit 6) when measuring the light distribution characteristics is the light source ( It is desirable that the maximum dimension of the light emitting surface of the lighting fixture is 5 times or more.
- the photometric distance when measuring the light distribution characteristics of a 1.2 m fluorescent lamp is preferably 6 m or more.
- the condition of 5 times the maximum dimension of the light emitting surface is determined on the assumption that the error in luminous intensity can be reduced to 1% or less even when the opening of the light beam emitted from the light source 30 is 120%. It is. Therefore, for example, when the light source 30 has a light collecting light distribution characteristic, 5 times the maximum dimension of the light emitting surface is insufficient, and a longer photometric distance is required.
- FIG. 8 is a schematic diagram showing an optical measurement apparatus 1B according to a second modification of the embodiment of the present invention.
- the optical measuring device 1B shown in FIG. 8 is different from the optical measuring device 1 shown in FIG. 1 in that a drum 2B is arranged instead of the drum 2. Since other configurations are the same as those of the optical measurement apparatus 1 shown in FIG. 1, detailed description will not be repeated.
- the drum 2B includes plane mirrors 16-1, 16-2, and 16-3 in addition to the plane mirror 12 and the plane mirror 14B.
- the plane mirror 14B reflects the light inside the drum 2 and emits the light to the outside of the drum 2 along the optical axis AX1 in the same manner as the plane mirror 14 shown in FIG.
- the plane mirrors 16-1, 16-2 and 16-3 constitute an optical path for guiding the light incident on the plane mirror 12 to the plane mirror 14B.
- the plane mirrors 16-1 and 16-2 configure a longer optical path by guiding the light from the light source 30 in a direction perpendicular to the X axis.
- FIG. 8 shows an example in which an optical path in which light from the light source 30 propagates only once along the Y axis in the upward direction on the paper surface is not limited to this. An optical path that propagates a plurality of times may be formed.
- FIG. 9 is a schematic diagram showing another optical measurement apparatus 1C according to the second modification of the embodiment of the present invention. 10 is a cross-sectional view taken along line XX of FIG.
- the drum 2C includes, in addition to the plane mirror 12 and the plane mirror 14C, plane mirrors 16-4, 16-5, 16-6, and 16-7 arranged with a predetermined relationship around the X axis.
- the plane mirror 14C reflects the light inside the drum 2 and emits the light to the outside of the drum 2 along the optical axis AX1 in the same manner as the plane mirror 14 shown in FIG.
- the plane mirrors 16-4, 16-5, 16-6, and 16-7 constitute an optical path for guiding the light incident on the plane mirror 12 to the plane mirror 14C. That is, the plane mirrors 16-4, 16-5, 16-6, and 16-7 configure a longer optical path by guiding the light from the light source 30 in the direction orthogonal to the X axis.
- the plane mirrors 16-4, 16-5, 16-6, and 16-7 are configured to circulate light from the light source 30 at least partially around the X axis.
- the optical path constituted by the plane mirrors 16-4, 16-5, 16-6 and 16-7 is longer than the optical path constituted by the plane mirror 16 shown in FIG. 1, a longer photometric distance can be realized.
- FIGS. 9 and 10 show an example in which an optical path in which the light from the light source 30 makes a 3 ⁇ 4 turn clockwise around the X axis is not limited to this, and a plurality of optical paths around the X axis are shown. An optical path that revolves may be formed. Furthermore, the configuration example shown in FIG. 8 and the configuration examples shown in FIGS. 9 and 10 may be appropriately combined.
- a kind of Moving Mirror light distribution measuring device can be realized.
- the ambient temperature of the light source 30 can be kept constant, and the characteristics of the light source 30 during measurement can be stabilized.
- the optical axis emitted from the drum 2 and entering the light receiving unit 6 is constant regardless of the rotation angle of the drum 2, the measurement accuracy can be improved.
- the observation window 18 is only provided as an opening on the surface from which the light reflected by the plane mirror 16 is emitted, stray light incident on the light receiving unit 6 can be reduced.
- the apparatus since the drive mechanism disposed on the outer peripheral side of the drum 2 is used, the apparatus can be made compact. Further, since the drive mechanism is on the outer peripheral side of the drum 2, the user can more easily access the light source 30.
Abstract
Description
好ましくは、光学測定装置は、第1の軸上に配置される受光部をさらに含む。
本実施の形態に従う光学測定装置1は、測定対象の光源から照射される光を照射角と関連付けて検出する。より具体的には、光学測定装置1は、光源を中心とする空間座標系における複数の位置での光度をそれぞれ測定することで、光源の光度についての空間分布を取得する。以下では、光放射特性の典型例として、光源の配光特性を測定する例について説明する。
上述したように、光学測定装置1は、ドラム2をその中心軸に沿って回転させるための回転機構を含む。ドラム2を回転駆動できれば、どのような機構を採用してもよい。例えば、ドラム2の中心部とモータとを機械的に連結し、当該モータの回転駆動によってドラム2を回転させてもよい。
図4は、図1に示すドラム2をX軸に沿って90°だけ回転させた状態を示す図である。図1には、光源30から鉛直下向きに照射される光を測定する状態を示す。これに対して、図4には、光源30から水平奥向きに照射される光を測定する状態を示す。図1および図4に示すいずれの測定状態においても、光源30から照射される光のうち測定対象の成分は、まず平面鏡12に入射し、その後、平面鏡14および16を経て、受光部6へ入射する。光源30から受光部6までの光学経路は、ドラム2がいずれの回転位置にあっても同一の光学距離に維持される。これにより、光源30の配光特性を測定できる。
次に、本実施の形態に従う処理装置200について説明する。図5は、本発明の実施の形態に従う処理装置200のハードウェア構成を示す概略図である。
次に、本実施の形態に従う光学測定装置1の電気的構成について説明する。図6は、本発明の実施の形態に従う光学測定装置1の電気的構成を示す概略図である。
光源30の放射特性を正確に測定するには、測定開始前に光源30を十分にエージングする必要がある。エージングとは、光源30を安定状態になるまで点灯させる動作をいう。以下、このようなエージングによる測定待ち時間を短縮できる変形例について説明する。
上述したJIS C8105-5:2011「照明器具-第5部:配光測定方法」によれば、配光特性を測定する際の測光距離(光源30から受光部6までの距離)は、光源(照明器具)の発光面の最大寸法の5倍以上が望ましいとされている。例えば、1.2mの蛍光灯の配光特性を測定する場合の測光距離は、6m以上とすることが好ましい。
本実施の形態によれば、一種のMoving Mirror方式の配光測定装置を実現できる。本実施の形態によれば、光源30が移動しないので、光源30の周囲温度を一定に保つことができ、測定中における光源30の特性を安定化できる。さらに、ドラム2から射出して受光部6に入射する光軸はドラム2の回転角度によらず一定であるので、測定精度を高めることができる。
Claims (7)
- 光源から照射される光を照射角と関連付けて検出するための光学測定装置であって、
一方の平面に第1の開口を有するとともに、他方の平面に第2の開口を有する、中空の円筒状部材と、
前記円筒状部材の中心軸である第1の軸に沿って前記円筒状部材を回転させるための回転機構と、
前記第1の軸上であって、かつ照射される光が前記第1の開口を通じて前記円筒状部材の内部に入射する位置である測定位置に、前記光源を配置するための支持部と、
前記円筒状部材の内部に配置され、前記光源から前記第1の開口を通じて入射する光を反射する第1の反射部と、
前記円筒状部材の内部の光を反射して、当該光を、前記第2の開口を通じて、前記第1の軸に沿って前記円筒状部材の外部へ伝搬させるための第2の反射部と、
前記第1の反射部で反射した光を前記第2の反射部へ入射させるための、少なくとも1つの第3の反射部とを備える、光学測定装置。 - 前記支持部は、前記第1の軸とは直交する第2の軸に沿って前記光源を回転可能に構成される、請求項1に記載の光学測定装置。
- 前記回転機構は、前記円筒状部材を回転支持するローラを含む、請求項1に記載の光学測定装置。
- 前記第1の軸上に配置される受光部をさらに備える、請求項1~3のいずれか1項に記載の光学測定装置。
- 前記支持部は、
複数の光源を支持するためのアームと、
前記アームを回転することで、前記測定位置に配置する光源を順次切り替える手段とを含む、請求項1~3のいずれか1項に記載の光学測定装置。 - 前記第3の反射部は、前記光源からの光を前記第1の軸とは直交する方向に導くように配置された複数の反射部を含む、請求項1~3のいずれか1項に記載の光学測定装置。
- 前記第3の反射部は、前記光源からの光を、前記第1の軸に周りを少なくとも部分的に周回するように構成されている、請求項6に記載の光学測定装置。
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KR1020147029595A KR101823197B1 (ko) | 2012-07-30 | 2012-07-30 | 광학 측정 장치 |
CN201280072460.4A CN104246456B (zh) | 2012-07-30 | 2012-07-30 | 光学测量装置 |
PCT/JP2012/069322 WO2014020660A1 (ja) | 2012-07-30 | 2012-07-30 | 光学測定装置 |
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US9500520B2 (en) | 2016-11-22 |
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TW201418674A (zh) | 2014-05-16 |
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