JP2010276565A - Measuring device and measuring method of optical characteristics of light source, and inspection device including the measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a measuring device and a measuring method of an optical characteristic of a light source having excellent measuring efficiency, capable of acquiring a measurement result equivalent to an integrating sphere system without using an expensive integrating sphere, and to provide an inspection device including the measuring device. <P>SOLUTION: A light source, a plurality of light receiving means having each light receiving part for receiving directly light radiated from the light source, and a light receiving means support means are prepared. The light source is arranged on the center of a virtual sphere, and at least two of the light receiving parts of each light receiving means are arranged on positions corresponding to the surface center of each surface, a middle point of each side, or each vertex of a virtual regular polyhedron inscribed on the virtual sphere, or on positions corresponding to some combination thereof. Then, the light source is allowed to emit light, and output from each light receiving means is detected, and spectral spectrum information of the light source is extracted, and the spectral spectrum information is subjected to operation processing, to thereby analyze the optical characteristic of the light source. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a measuring device and measuring method for optical characteristics of a light source, and an inspection device equipped with the measuring device.

  Conventionally, as a method for measuring optical characteristics of light emitted from a light source such as an LED, for example, a receiver fixing method as shown in FIG. 10, a receiver rotating method as shown in FIG. 11, and FIGS. An integrating sphere method and an integrating hemisphere method as shown are known.

As shown in FIG. 10, the measurement method of the light receiver fixing method is such that light emitted from a stationary light source 20 is fixed by a single light receiver 30 that is fixedly disposed at a position away from the light source 20 by a certain distance. This is a method of directly receiving light. Here, since the light source 20 emits light with the optical axis 20a of the light source 20 as a spatial symmetry axis, the light receiving unit 30a of the light receiver 30 is generally disposed on the optical axis 20a. The
However, in this measurement, light from a light source radiated in various directions is only measured by a single light receiver 30 that is fixedly arranged, so that a large measurement error is likely to occur in the measurement value, and measurement accuracy is high. There is a problem that is bad.

In addition, as shown in FIG. 11, the measuring method of the light receiving device rotation method is a method in which light emitted from a stationary light source 20 is directly received by the light receiving unit 30 a of the light receiving device 30 that rotates around the light source 20. It is.
However, in this measurement, a rotating device for rotating the light receiver 30 is required, and the light from the light source 20 must be sequentially measured while rotating the light receiver 30. Therefore, measurement efficiency is deteriorated and measurement time is reduced. There is a problem that becomes longer.

On the other hand, in the integrating sphere method, as shown in FIG. 12, a light source 20 is arranged in a sealed space in an integrating sphere 21 whose inner wall is coated with a highly diffusive and highly reflective material. This is a method in which a part of the reflected light is received by the light receiving means 30 by mutually reflecting the reflected light within the integrating sphere 21. The integrating sphere 21 is provided with a self-absorption correcting light source 23 and its shielding plate 24 in the integrating sphere 21 in order to eliminate the influence of light self-absorption by the light source 20 itself.
Further, as shown in FIG. 13, the integrating hemispherical measurement method is such that a light source 20 is placed in a sealed space in an integrating hemisphere 25 whose inner wall is coated with a highly diffusive and highly reflective material. In this method, the reflected light is mutually reflected in the integrating hemisphere 25 so that a part of the reflected light is received by the light receiving means 30. In this integrating hemisphere 25, a self-absorption correcting light source 27 and its shielding plate 28 are provided in the integrating hemisphere 25 in order to eliminate the influence of light self-absorption by the light source 20 itself.
In these measurements, the measurement time is greatly shortened as compared with the light receiver rotation method. However, in order to eliminate the influence of light self-absorption by the light source itself arranged in the integrating sphere or integrating hemisphere, a self-absorption correcting light source and a shielding plate are required. In addition, the integrating sphere and integrating hemisphere (hereinafter collectively referred to as integrating sphere) are very expensive and large, and there is a problem that the measuring device using the integrating sphere is expensive and the measuring device is large. is there.

  Furthermore, as shown in FIG. 14, an inspection device 70 for optical characteristics of a light source, which includes a measuring device using the integrating sphere 21 of FIG. This inspection device 70 is for sequentially inspecting the optical characteristics of a large number of light sources 20 in order, and includes a conveying means 80 for conveying the light sources 20 to the integrating sphere 21 and an opening 82 of the integrating sphere. And an elevating mechanism 81 that can be moved up and down to be arranged at the center of the integrating sphere 21. However, since this inspection apparatus 70 uses an expensive and large integrating sphere, there are problems that the inspection apparatus is expensive and the inspection apparatus is enlarged. In addition, a large number of light sources 20 are continuously transported on the transport means 80 and moved to a predetermined position below the integrating sphere 21, and then the lifting mechanism 81 is moved upward to be arranged at the center of the integrating sphere 21. Then, after the optical characteristics are measured, the lifting mechanism 81 is moved downward again to be returned to the conveying means 80. As a result, there is a problem that the inspection time becomes very long.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a measurement device and a measurement method for optical characteristics of a light source, which can obtain a measurement result equivalent to that of an integrating sphere method without using an expensive integrating sphere, and has a high measurement efficiency. . Another object of the present invention is to provide an inspection apparatus provided with a measurement apparatus for optical characteristics of a light source, which is low in cost, compact and has high measurement efficiency.

  In order to solve the above problems, the present invention is a measuring apparatus for measuring optical characteristics of a light source, and supports a plurality of light receiving means for directly receiving light emitted from the light source, and the light receiving means. By detecting the output of each light receiving means by detecting the light receiving means supporting means, the spectral detection means for extracting the spectral spectrum information of the light source, and by calculating the spectral spectrum information extracted from the spectral detection means Optical characteristic analysis means for analyzing the optical characteristics of the light source, and each of the light receiving means has a light receiving part that directly receives light emitted from the light source, and at least two of the light receiving parts When the light source is arranged at the center of the virtual sphere, the surface center of each surface of the virtual regular polyhedron inscribed in the virtual sphere, the position corresponding to the midpoint or each vertex of each side, or A position corresponding to a combination of any of these, to provide a measurement apparatus characterized by being arranged.

  In the above configuration, it is preferable that at least one of the light receiving portions is disposed on an optical axis of the light source.

  In the above configuration, it is preferable that the spectral detection means extracts the spectral information by detecting the combined output of the light receiving means. Alternatively, when there is a group that receives the same amount of light among the light receiving means, the spectral detection means outputs the output of one representative light receiving means from the light receiving means in the group. It is preferable that the spectral information is extracted by weighting according to the number of light receiving means within and detecting it in a combined state with the outputs of other light receiving means not belonging to the group.

  Further, in the above configuration, the optical characteristic analysis unit takes in the spectral spectrum information extracted from the spectral detection unit and performs arithmetic processing to calculate spectral distribution data regarding the light source, and further calculates the spectral distribution data. A data calculation unit that calculates optical data related to the light source obtained by the arithmetic processing, and one or both of the spectral distribution data and the optical data calculated by the data calculation unit are set in advance as a reference. It is preferable to include a data comparison unit for comparing with data and a comparison result display unit for displaying a comparison result of the data comparison unit. Here, the optical data is related to the color of the light source, and is preferably data related to at least one of chromaticity, color temperature, and color rendering index.

  Furthermore, in the above-described configuration, by including a transport unit that transports the light source to the center of the virtual sphere, and a housing that houses each of the light receiving units and has an opening through which the transport unit passes. An inspection apparatus for inspecting the optical characteristics of the light source can be provided.

  In order to solve the above-mentioned problems, the present invention is also a method for measuring optical characteristics of a light source, and (a) a plurality of light receiving means having the light source and a light receiving unit that directly receives light emitted from the light source. And (b) a step of arranging the light source at the center of the virtual sphere, and (c) at least one of the light receiving portions of the light receiving means. Placing two at the position corresponding to the surface center of each face of the virtual regular polyhedron inscribed in the virtual sphere, the position corresponding to the midpoint or each vertex of each side, or any combination thereof; (D) causing the light source to emit light; (e) detecting the output of each light receiving means to extract spectral spectrum information of the light source; and (f) calculating the spectral spectrum information. Above To provide a measuring method characterized by comprising the step of analyzing the optical properties of the source, the.

  In the above configuration, in step (c), it is preferable that at least one of the light receiving portions is disposed on the optical axis of the light source.

  In the above configuration, it is preferable that in step (e), the spectral information is extracted by detecting the outputs of the light receiving means in a combined state. Alternatively, in the step (e), when there is a group that receives the same amount of light among the light receiving units, the light received by one representative light receiving unit among the light receiving units in the group. The output is weighted according to the number of light receiving means in the group, and the spectral spectrum information is extracted by detecting the output combined with the output of light received by other light receiving units not belonging to the group. It is preferable.

  In the above configuration, the step (f) relates to the light source obtained by calculating the spectral distribution information to calculate spectral distribution data related to the light source and further calculating the spectral distribution data. Calculating optical data; comparing the optical data with preset reference data; and comparing one or both of the spectral distribution data and the optical data with preset reference data Preferably, the method includes a step and a step of displaying a result of the comparison.

According to the present invention, when at least two of the light receiving units are arranged at the center of the virtual sphere, the surface center of each surface of the virtual regular polyhedron inscribed in the virtual sphere and the midpoint of each side Alternatively, it is configured to be arranged at a position corresponding to each vertex or a position corresponding to any combination thereof. Then, the optical characteristics of the light source are analyzed by detecting the output of each light receiving means, extracting the spectral spectrum information, and further calculating the spectral spectrum information without using an expensive integrating sphere. It is possible to provide a measurement device and a measurement method for optical characteristics of a light source, which can obtain a measurement result equivalent to that of the integrating sphere method and have high measurement efficiency.
Further, according to the present invention, the inspection apparatus is composed of the measurement apparatus, the conveying means, and the housing. According to this configuration, since the light source is directly conveyed to the center of the virtual sphere through the opening of the housing, an elevating mechanism for arranging the light source at the center of the virtual sphere becomes unnecessary, and the optical characteristics of the light source are inspected. Therefore, it is possible to provide a low-cost and simple configuration inspection apparatus capable of shortening the inspection time.

It is a flowchart which shows an example of the measuring method of the optical characteristic of the light source of this invention. 1 is a schematic view of a measuring apparatus according to a first embodiment of the present invention. It is the schematic for demonstrating the light-receiving means (optical fiber) support means of the measuring apparatus of FIG. 2A. It is the schematic of the measuring apparatus by 2nd Example of this invention. It is the schematic for demonstrating the light-receiving means (optical fiber) support means of the measuring apparatus of FIG. 3A. It is the schematic of the measuring apparatus by 3rd Example of this invention. It is the schematic for demonstrating the light-receiving means (optical fiber) support means of the measuring apparatus of FIG. 4A. It is the schematic of the test | inspection apparatus provided with the measuring apparatus by 4th Example of this invention. It is the schematic for demonstrating the light-receiving means (optical fiber) support means of the inspection apparatus of FIG. 5A. (A) is a graph comparing the measurement results of the optical characteristics of the light source using the measuring method according to the second embodiment of the present invention and the measuring method using the integrating sphere method, and (b) is a measurement using the conventional single light receiver fixing method. It is the graph which compared the measurement result of the optical characteristic of the light source using the method and the measuring method by an integrating sphere system. It is explanatory drawing which shows the other example of the arrangement pattern of a light-receiving part. It is explanatory drawing which shows the other example of the arrangement pattern of a light-receiving part. It is explanatory drawing which shows the other example of the arrangement pattern of a light-receiving part. It is explanatory drawing which shows the other structural example of a spectrum detection means. It is explanatory drawing which shows the other structural example of a spectrum detection means. It is explanatory drawing which shows the measuring method by the conventional receiver fixing system. It is explanatory drawing which shows the measuring method by the conventional receiver rotation system. It is explanatory drawing which shows the measuring method by the conventional integrating sphere system, (a) is a perspective view which shows the state which opened the integrating sphere, (b) is the AA 'line of (a) in the state which closed the integrating sphere. FIG. It is explanatory drawing which shows the measuring method by the conventional integration hemisphere system, (a) is a perspective view of an integration hemisphere, (b) is a cross-sectional view of (a). It is explanatory drawing which shows the structure of the conventional inspection apparatus, (a) is a perspective view of an inspection apparatus, (b) is a cross-sectional view of an inspection apparatus.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a flowchart showing an example of a method for measuring optical characteristics of a light source according to the present invention.
As shown in FIG. 1, according to the present invention, first, a light source, a plurality of light receiving means that directly receive light emitted from the light source, a light receiving means support means that supports each light receiving means, Is prepared (step S10).
A known light source such as a point light source or a planar light source is used as the light source. As the light receiving means, an optical fiber, an image sensor, or the like may be used.

Next, the light source is arranged at the center of the virtual sphere (step S20). And at least two of the light receiving portions of each light receiving means are arranged at positions corresponding to the center of each surface of the virtual regular polyhedron inscribed in the virtual sphere, the midpoint or each vertex of each side, or any combination thereof. It arrange | positions in a corresponding position (step S30).
Here, there are five types of regular polyhedrons: regular tetrahedron, regular hexahedron, regular octahedron, regular dodecahedron, and regular icosahedron.

  Next, the light source is caused to emit light (step S40). As a light emitting method of the light source, the light source may be caused to emit light before being arranged at the center of the virtual sphere, or the light source may be caused to emit light after being arranged at the center of the virtual sphere. .

Then, the output of each light receiving means is detected, and the spectral spectrum information of the light source is extracted (step S50). Here, the spectral information includes at least information indicating the wavelength λ of light and the intensity of light at the wavelength λ.
In step S50, it is preferable to extract the spectral information by detecting the combined outputs of the light receiving means. Alternatively, in particular, when there is a group that receives the same amount of light among the light receiving units, the output of the light received by one representative light receiving unit among these light receiving units within the group is included in the group. Spectral spectrum information can also be extracted by weighting according to the number of light receiving means and detecting in a state combined with the output of light received by other light receiving units not belonging to the group.
Here, the output of each light receiving means may be optically synthesized by using a lens or the like, or may be electrically synthesized by using an adder circuit or the like.

Finally, spectral spectrum information is processed to analyze the optical characteristics of the light source (step S60). More specifically, in this step S60, spectral spectrum information is calculated to calculate spectral distribution data related to the light source, and optical data related to the light source obtained by further calculating the spectral distribution data. (Step S61) One or both of these spectral distribution data and optical data is compared with preset reference data (Step S62), and the comparison result is displayed (Step S63).
Here, the reference data is preferably spectral distribution data and optical data obtained by calculating the reference light source in steps S10, S20, S30, S40, S50, and S61. The optical data is, for example, related to the color of the light source, and is preferably data related to at least one of chromaticity, color temperature, and color rendering index.

  Several preferred embodiments of the present invention are described below.

Example 1
FIG. 2A is a schematic view of a measuring apparatus according to the first embodiment of the present invention. FIG. 2B is a schematic diagram for explaining the light receiving means supporting means of the measuring apparatus of FIG. 2A.
As shown in FIGS. 2A and 2B, the measuring apparatus 1 includes a light source 2, which is a sample to be measured, twelve light receiving means 3A to 3L, a light receiving means support means 4, a spectral detection means 5, and an optical characteristic analysis means. 6 and so on. The light source 2 is arranged at an appropriate position by light source support means (not shown).

Each of the light receiving means 3A to 3L is made of an optical fiber, and has a light receiving unit 3 that directly receives light emitted from the light source 2 at one end thereof. Each of the optical fibers 3A to 3L is configured to output light from the other end.
Each light receiving unit 3 is disposed at a position corresponding to the center of each surface of the virtual regular dodecahedron D inscribed in the virtual sphere when the light source 2 is disposed at the center of the virtual sphere (not shown). The light source 2 generally emits light with the optical axis as a spatial symmetry axis, and it is preferable that at least one light receiving unit 3 is disposed on the optical axis. Hereinafter, in order to simplify the description, it is assumed that the light receiving unit 3 of the optical fiber 3 </ b> C is disposed on the optical axis of the light source 2.

  The optical fiber support means 4 supports the optical fibers 3A to 3L. Here, as shown in FIG. 2B, the optical fiber support means 4 is constituted by, for example, a cubic housing, and the light receiving portions of the optical fibers 3A to 3L are made by passing each optical fiber through an opening provided in the housing. The optical fibers 3A to 3L are supported so that 3 is arranged at a position corresponding to the center of each surface of the virtual dodecahedron D. The housing 4 is preferably configured to form a dark room so that light is not reflected, for example, an inner wall of the housing 4 is coated with a material that does not reflect light.

The spectral detection means 5 includes a lens 5a and a spectroscope 5b.
The lens 5a collects and combines light output from the other ends of the optical fibers 3A to 3L.
The spectroscope 5b extracts spectral spectrum data R (λ) as spectral spectrum information of the light source 2 by detecting light synthesized by the lens 5a. As the spectral data R (λ) extracted by the spectroscope 5b, spectral data R _k (λ) of the light source 2 which is a sample to be measured, spectral data R _s (λ) of a standard light source serving as a reference, etc. There is.
The spectral spectrum data R _k (λ) and R _s (λ) are both intensities of light at each wavelength λ obtained by dividing various wavelength ranges (for example, wavelengths 380 nm to 780 nm) at predetermined wavelength sampling intervals (for example, 5 nm intervals). This means data indicating Both of the spectral data R _k (λ) and R _s (λ) are preferably extracted in a state where the dark output removal processing by a known method is performed by the spectroscope 5b.

The optical characteristic analysis means 6 includes a data calculation unit 6a, a data comparison unit 6b, and a comparison result display unit 6c. The data calculation unit 6a includes a first data calculation unit 6a1 and a second data calculation unit 6a2.
The first data calculation unit 6a1 of the data calculation unit 6a takes in the spectral spectrum data R _k (λ) and R _s (λ) extracted from the spectral detection means 5, and performs arithmetic processing according to the following equation (1). Thus, spectral distribution data S _k (λ) related to the light source 2 is calculated.

Furthermore, the second data calculation unit 6a2 of the data calculation unit 6a further performs a calculation process on the spectral distribution data S _k (λ) related to the light source 2 calculated by the equation (1), for example, to obtain a color related to the color of the light source 2. Optical data such as degree, color temperature, and color rendering index are calculated as follows.

In order to calculate the chromaticity coordinates (chromaticity) of the XYZ color system relating to the color of the light source 2, the second data calculation unit 6a2 uses the spectral distribution data S _k (λ) related to the light source 2 calculated by the equation (1). The tristimulus values X _k , Y _k , and Z _k of the light source 2 are _obtained by the following equations.

また、第２のデータ算出部６ａ２は、（２）式によって求めた三刺激値Ｘ、Ｙ、Ｚを用いて、光源２のＵＣＳ色度図上の色度座標ｕ、ｖを次式によって求めることもできる。

The second data calculation unit 6a2 uses the tristimulus values X, Y, and Z obtained by the equation (2) to calculate the chromaticity coordinates (chromaticity) x and y of the XYZ color system of the light source 2 by the following equations. Ask.

Further, the second data calculation unit 6a2 obtains chromaticity coordinates u and v on the UCS chromaticity diagram of the light source 2 by the following equation using the tristimulus values X, Y and Z obtained by the equation (2). You can also

  Further, the data calculation unit 6a calculates the color temperature and the color rendering index of the light source 2 from the chromaticity coordinates of the light source 2 calculated by, for example, the expression (3) or (4) by a known calculation method. Then, detailed explanation is omitted.

The data comparison unit 6b compares the spectral distribution data and the optical data calculated by the data calculation unit 6a with preset reference data. The data comparison unit 6b is configured to compare the spectral distribution data and optical data calculated by the data calculation unit 6a with preset reference data (spectral distribution data and optical data of a known standard light source). However, it may be configured to compare only the spectral distribution data and preset reference data (spectral distribution data of a known standard light source).
Here, the reference data means spectral data of a standard light source serving as a reference in advance and optical data such as color temperature, chromaticity, and color rendering index obtained by further calculating the spectral distribution data. These data are calculated by the above-described arithmetic processing by the data calculation unit 6a of the optical characteristic analysis unit 6 based on the spectral spectrum information extracted by the spectral detection unit using a standard light source as a reference in advance. Is preferred.
The comparison result display unit 6c is a display, for example, and displays the comparison result of the data comparison unit 6b.

Next, the operation of the measuring apparatus 1 will be briefly described.
First, the light radiated | emitted from the light source 2 is received by each light-receiving part 3 of the one end side of each optical fiber 3A-3L.
Next, the output from the other end of each of the optical fibers 3A to 3L is taken into the spectroscope 5b in a state of being synthesized by the lens 5a, and spectral data R (λ) (R _k (λ) or R _s (λ) etc.) is extracted.

  Then, the data calculation unit 6a calculates the spectral spectrum data R (λ) by the calculation processing method described above, and further calculates the spectral distribution data of the light source 2 and the spectral distribution data. Optical data relating to at least one of the obtained chromaticity, color temperature and color rendering index is calculated. Furthermore, the data comparison unit 6b compares the spectral distribution data and the optical data calculated by the data calculation unit with preset reference data. Finally, the comparison result display unit 6c displays a comparison result between the spectral distribution data and the optical data and the reference data.

According to the configuration of the measuring apparatus 1, each light receiving unit 3 corresponds to the surface center of each surface of the virtual regular dodecahedron inscribed in the virtual sphere when the light source 2 is arranged at the center of the virtual sphere. To arrange.
Then, the output of each of the optical fibers 3A to 3L is detected by the spectroscopic detection means 5 in an optically synthesized state using the lens 5a, and spectral spectrum data is extracted. The optical characteristics of the light source 2 are analyzed by processing the spectrum data.
Therefore, it is possible to provide a measuring device and a measuring method for optical characteristics of a light source, which can obtain a measurement result equivalent to that of the integrating sphere method without using an expensive integrating sphere, and which has a high measurement efficiency.

(Example 2)
FIG. 3A is a schematic diagram of a measuring apparatus according to a second embodiment of the present invention. FIG. 3B is a schematic view for explaining the optical fiber support means of the measuring apparatus of FIG. 3A. The second embodiment employs a planar light source that emits light only upward as the light source, the number of optical fibers reduced to half that of the first embodiment, and the structure of the optical fiber support means in the first embodiment. It differs from the first embodiment in that it is more compact than the example. Therefore, only the differences from the first embodiment will be described here.

  As shown in FIGS. 3A and 3B, the measuring apparatus 1 includes a planar light source 2 that is a sample to be measured, six optical fibers 3A to 3F, and an optical fiber support means 4. The planar light source 2 is arranged at an appropriate position by light source support means (not shown).

Next, operation | movement of this measuring apparatus 1 is demonstrated easily.
First, the light radiated | emitted from the light source 2 is received by each light-receiving part 3 of the one end side of each optical fiber 3A-3F.
Next, the output from the other end of each of the optical fibers 3A to 3F is taken into the spectroscope 5b in a state of being synthesized by the lens 5a, and the spectroscopic spectrum data R (λ) is extracted by the spectroscope 5b.

  Then, the data calculation unit 6a calculates the spectral spectrum data by the above-described calculation method, and further calculates the spectral distribution data of the light source 2 and the spectral distribution data, and the chromaticity, color temperature, and color rendering obtained by the calculation. Optical data relating to at least one of the evaluation numbers is calculated. Furthermore, the data comparison unit 6b compares the spectral distribution data and the optical data calculated by the data calculation unit 6a with preset reference data. Finally, the comparison result display unit 6c displays a comparison result between the spectral distribution data and the optical data and the reference data.

According to the configuration of the measuring apparatus 1, the spectral detection means 5 detects the output of each of the optical fibers 3A to 3F in an optically synthesized state using the lens 5a, and extracts spectral spectrum data R (λ). Further, the optical characteristic analysis means 6 performs an arithmetic process on the spectral spectrum data R (λ), thereby analyzing the optical characteristics of the light source 2.
Therefore, it is possible to provide a compact measuring apparatus having a smaller number of light receiving means (optical fibers) than the measuring apparatus of the first embodiment.

(Example 3)
FIG. 4A is a schematic view of a measuring apparatus according to a third embodiment of the present invention. FIG. 4B is a schematic view for explaining the optical fiber support means of the measuring apparatus of FIG. 4A. The third embodiment is different from the second embodiment in that the number of optical fibers is significantly reduced from that of the second embodiment and an attenuator is provided. Therefore, only the differences from the second embodiment will be described here.

  As shown in FIGS. 4A and 4B, the measuring apparatus 1 includes a planar light source 2 that is a sample to be measured, two optical fibers 3C and 3F, an optical fiber support means 4, and an attenuator 5c.

  Here, in the measuring apparatus 1, the optical fibers 3A, 3B, 3D, and 3E shown in the second embodiment are omitted. This is because each of the light receiving portions 3 of the optical fibers 3A, 3B, 3D, 3E, and 3F shown in the second embodiment receives the same amount of light, so that one of the light receiving portions 3 receives light from one representative optical fiber 3F. The output of the light receiving unit 3 of the optical fiber 3C and the output of the light receiving unit 3 of the optical fiber 3F are synthesized by weighting the output of the light receiving unit 3 of the light receiving unit 3 of the other optical fiber 3C. Based on the reason that it should be.

  That is, the combination of the output of the light receiving unit 3 of the optical fiber 3C and the output of the light receiving unit 3 of the optical fiber 3F amplified five times is the light receiving unit of the optical fibers 3A, 3B, 3C, 3D, 3E, and 3F. This is based on the idea that it is equivalent to the synthesized output of 3. Or what attenuate | damped the output of the light-receiving part 3 of the optical fiber 3C 1/5 times, and what combined the output of the light-receiving part 3 of the light-receiving means 3F are optical fibers 3A, 3B, 3C, 3D, 3E, and 3F. Based on the idea that it is equivalent to the synthesized output of the light receiving unit 3. In the third embodiment, the latter idea is adopted.

Next, operation | movement of this measuring apparatus 1 is demonstrated easily.
First, light emitted from the light source 2 is received by each light receiving unit 3 on one end side of each of the optical fibers 3C and 3F.
The output from the other end of the optical fiber 3C is attenuated by 1/5 by the attenuator 5c, and is taken into the spectroscope 5b in a state synthesized with the output from the other end of the optical fiber 3F and the lens 5a. The spectral data R (λ) is extracted by the spectroscope 5b.

  Further, the data calculation unit 6a performs an operation process on the spectral spectrum data R (λ) by the above-described calculation method, and further calculates the spectral distribution data of the light source 2 and the spectral distribution data, Optical data relating to at least one of the color temperature and the color rendering index is calculated. Furthermore, the data comparison unit 6b compares the spectral distribution data and the optical data calculated by the data calculation unit 6a with preset reference data. Finally, the comparison result display unit 6c displays a comparison result between the spectral distribution data and the optical data and the reference data.

  Therefore, according to the configuration of the measuring apparatus 1, the number of components such as optical fibers can be greatly reduced as compared with the measuring apparatus of the second embodiment, so that there is an advantage that the measuring apparatus can be further downsized.

Example 4
5A and 5B are schematic views of an inspection apparatus provided with a measuring apparatus according to a second embodiment of the present invention. The fourth embodiment is different from the second embodiment in that the measuring device according to the second embodiment is further provided with a conveying means and a housing. Therefore, only the differences from the second embodiment will be described here.

  As shown in FIGS. 5A and 5B, the inspection apparatus 7 includes the measurement apparatus 1 of the second embodiment, a transport unit 8, and an optical fiber support unit (housing) 9. Here, the conveyance means 8 consists of a conveyor, for example, and conveys the light source 2 to the center of a virtual sphere one after another. Further, the housing 9 has the same shape as the optical fiber support means 4 of the measuring apparatus 1 of the second embodiment, and accommodates each light receiving unit 3 and has an opening 9a through which the transport means 8 passes.

  According to this inspection device 7, the light source 2 is directly conveyed to the center of the virtual sphere through the opening 9a of the housing 9, so that the lifting mechanism as shown in FIG. 14 for arranging the light source 2 at the center of the virtual sphere. 81 becomes unnecessary. Therefore, it is possible to provide a low-cost and simple configuration inspection apparatus that can shorten the inspection time for inspecting the optical characteristics of the light source.

(Experimental example)
In order to compare the measurement method of the second embodiment of the present invention with the conventional integrating sphere method, the correlation between the color temperatures of various types of light sources (samples 1 to 7) is calculated using these measurement methods. Examined. In addition, in order to compare a measurement method using a single light receiver fixing method (FIG. 10) in which a light receiving unit is arranged on the optical axis of a conventional light source to be measured with an integrating sphere method, these measurements are performed. Using the method, the correlation between the color temperatures of various types of light sources (Samples 1-7) was examined.

(Experimental result)
The measurement results of the color temperature of the light sources (samples 1 to 7) by the above measurement method are shown in FIGS. 6 (a) and 6 (b).
Each of the graphs shown in FIGS. 6A and 6B represents a difference between measured values when the color temperature of the same sample is measured by two different measuring methods. As for how to read these graphs, a regression line is calculated based on the result of plotting the measurement results of both, and as the value of the correlation coefficient R ² of the regression line approaches 1, all plots are on the regression line. Yes, it means that the degree of deviation between the two measured values is small (the correlation is strong). The value of the correlation coefficient R ² is, for example, by spreadsheet software or the like, is calculated by a known calculation formula.

In the graph shown in FIG. 6 (a), the calculated value becomes 0.9997 correlation coefficient R ² of the regression line, the color temperature of the conventional integrating sphere method, measured by the measuring method according to the second embodiment of the present invention There is a strong correlation with the color temperature measured by the above measuring method. On the other hand, in the graph shown in FIG. 6 (b), the calculated value is next 0.9624 correlation coefficient ^{R 2} of the regression line, small compared to the case of FIG. 6 (a). That is, there is a very strong correlation between the color temperature calculated by the conventional measuring method using the single receiver fixing method of FIG. 10 and the color temperature measured by the conventional integrating sphere measuring method. Absent.
Therefore, it can be seen that according to the measurement method of the second embodiment of the present invention, the measurement result of the optical characteristics of the light source almost the same as that measured by the integrating sphere measurement method can be obtained.

  As mentioned above, although preferable embodiment of this invention was described, the structure of this invention is not limited to these embodiment. Various modifications and improvements can be created within the scope of the configurations described in the claims of the present application.

  For example, in Examples 1 to 4, each light receiving unit 3 is arranged at a position corresponding to the surface center of each surface of the virtual regular dodecahedron D. However, as shown in FIGS. You may arrange | position in the position corresponding to the surface center of each surface of a polyhedron, the midpoint of each edge | side, or each vertex. You may arrange | position each light-receiving part 3 in the predetermined position of each regular polyhedron corresponding to the case where FIG. 7A-7C is combined. Further, as shown in the second and third embodiments, when the point light source emits light only upward, the number of light receiving means can be further eliminated.

  In the first to fourth embodiments, the configuration of the spectral detection means 5 is optically configured using the lens 5a. For example, by using an image sensor as the light receiving means, the light receiving means as shown in FIG. An adder 5d that electrically synthesizes the outputs from 3A 'to 3F' may be electrically configured, or as shown in FIG. 9, for example, an amplifier that amplifies the output from the light receiving means 3F 'by 5 times. 5e and adder 5d may be used for electrical configuration.

  In the experimental examples, the color temperature of the light source was taken up and explained, but the same experimental results were obtained with respect to the spectral distribution data of the light source and optical data such as chromaticity and color rendering index obtained from the spectral distribution data. Needless to say.

DESCRIPTION OF SYMBOLS 1 Measuring apparatus 1 'Measuring apparatus 2 Light source 3 Light-receiving part 3' Light-receiving part 3A-3L Light-receiving means (optical fiber)
3A 'to 3F' Light receiving means (image sensor)
4 Light receiving means supporting means (optical fiber supporting means)
4 'light receiving means supporting means (image sensor supporting means)
5 Spectral detection means 5 'Spectral detection means 5a Lens 5b Spectrometer 5c Attenuator 5d Adder 5e Amplifier 6 Optical characteristic analysis means 6a Data calculation section 6a1 First data calculation section 6a2 Second data calculation section 6b Data comparison section 6c Comparison result display unit 7 Inspection device 8 Conveying means 9 Optical fiber support means (housing)
9a Aperture 20 Light source 20a Optical axis 21 Integrating sphere 21a Integrating sphere half 22 Shield plate 23 Self absorption correction light source 24 Shield plate 25 Integration hemisphere 26 Shield plate 27 Self absorption correction light source 28 Shield plate 30 Light receiving means 30a Light receiving portion 70 Inspection Device 80 Conveying means 81 Elevating mechanism 82 Opening D Virtual regular dodecahedron H Virtual regular hexahedron I Virtual regular icosahedron O Virtual regular octahedron T Virtual regular tetrahedron

Claims (12)

A measuring device for measuring optical characteristics of a light source,
A plurality of light receiving means for directly receiving light emitted from the light source;
A light receiving means supporting means for supporting each light receiving means;
Spectral detection means for extracting spectral spectrum information of the light source by detecting the output of each light receiving means;
Optical characteristic analysis means for analyzing the optical characteristics of the light source by calculating the spectral information extracted from the spectral detection means,
Each of the light receiving units has a light receiving unit that directly receives light emitted from the light source, and at least two of the light receiving units have the virtual light source when the light source is arranged at the center of a virtual sphere. A measuring device, wherein the measuring device is arranged at a position corresponding to a surface center of each surface of a virtual regular polyhedron inscribed in a sphere, a midpoint or a vertex of each side, or a combination thereof. .   The measuring apparatus according to claim 1, wherein at least one of the light receiving units is disposed on an optical axis of the light source.   The measurement apparatus according to claim 1, wherein the spectral detection unit extracts the spectral information by detecting the combined output of the light receiving unit.   When there is a group that receives the same amount of light among the light receiving means, the spectral detection means outputs the output of one representative light receiving means from the light receiving means within the group. 3. The spectral spectrum information is extracted by weighting according to the number of light receiving means and detecting in a combined state with outputs of other light receiving means not belonging to the group. The measuring device described in 1. The optical characteristic analysis means includes
The spectral information extracted from the spectral detection means is calculated and processed to calculate spectral distribution data related to the light source, and optical data related to the light source obtained by further calculating the spectral distribution data. A data calculation unit to calculate,
A data comparison unit that compares one or both of the spectral distribution data and the optical data calculated by the data calculation unit with preset reference data;
The measurement apparatus according to claim 1, further comprising a comparison result display unit that displays a comparison result of the data comparison unit.   6. The measuring apparatus according to claim 5, wherein the optical data relates to a color of the light source, and is data related to at least one of chromaticity, color temperature, and color rendering index. A measuring device according to any one of claims 1 to 6,
Conveying means for conveying the light source to the center of the virtual sphere;
An inspection apparatus for inspecting optical characteristics of a light source, which includes each of the light receiving units and a housing having an opening through which the transport unit passes. A method of measuring optical characteristics of a light source,
(A) preparing the light source, a plurality of light receiving means having a light receiving unit that directly receives light emitted from the light source, and a light receiving means supporting means for supporting the light receiving means;
(B) placing the light source in the center of the virtual sphere;
(C) At least two of the light receiving portions of each of the light receiving means are positioned corresponding to the center of each surface of the virtual regular polyhedron inscribed in the virtual sphere, the midpoint of each side, or each vertex, or any one of these. Arranging at a position corresponding to the combination of
(D) causing the light source to emit light;
(E) detecting the output of each light receiving means to extract spectral spectrum information of the light source;
(F) Computation processing of the spectral information and analyzing the optical characteristics of the light source.   The measurement method according to claim 8, wherein in step (c), at least one of the light receiving units is arranged on an optical axis of the light source.   The measurement method according to claim 8 or 9, wherein, in the step (e), the output of the light receiving means is detected in a combined state and the spectral spectrum information is extracted.   In the step (e), when there is a group that receives the same amount of light among the light receiving units, the output of the light received by one representative light receiving unit among the light receiving units in the group is output. , Weighting according to the number of light receiving means in the group, and extracting the spectral spectrum information by detecting in a combined state with the output of light received by each other light receiving unit not belonging to the group The measurement method according to claim 8 or 9, wherein the measurement method is characterized.   The step (f) calculates the spectral distribution data regarding the light source by calculating the spectral spectrum information and calculating optical data regarding the light source obtained by further calculating the spectral distribution data. Comparing the optical data with preset reference data, comparing one or both of the spectral distribution data and the optical data with preset reference data, and comparing these The method according to claim 8, further comprising a step of displaying a result.

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