WO2016208462A1

WO2016208462A1 - Measureing device and method of manufacturing measureing device

Info

Publication number: WO2016208462A1
Application number: PCT/JP2016/067712
Authority: WO
Inventors: 克敏 ▲鶴▼谷; 将人柏原; 豊門脇; 敏夫丸地; 耕平麻生
Original assignee: コニカミノルタ株式会社
Priority date: 2015-06-24
Filing date: 2016-06-15
Publication date: 2016-12-29
Also published as: JP6794986B2; DE112016002826T5; JPWO2016208462A1

Abstract

The present invention reduces the deviation of the relative spectral responsivity of a measuring device from a spectral responsivity function without increasing the manufacturing cost of the measuring device. In a luminance meter, a light beam to be measured is branched by a bundle fiber. Each of the plurality of light beams that are obtained passes through a color filter. The relative spectral responsivity achieved by each of the plurality of color filters is made to approximate a standard relative spectral sensitivity. Each of the plurality of light beams that has passed through a color filter is received by a light receiving sensor. Each of the plurality of light receiving sensors outputs an electrical signal in accordance with the light beam received. A derivation mechanism derives a luminance value corresponding to the spectral distribution of the light beams being measured from the plurality of electrical signals that are obtained.

Description

Measuring instrument and method for producing the measuring instrument

The present invention relates to a measuring instrument and a method for producing the measuring instrument.

In the luminance meter, a color filter is used in order to approximate the relative spectral responsivity indicating the relationship between the spectral distribution of the light beam to be measured and the luminance value to the standard relative luminous sensitivity. In the illuminometer, a color filter is used to approximate the relative spectral response indicating the relationship between the spectral distribution of the light beam to be measured and the illuminance value to the standard relative luminous sensitivity. In the colorimeter, a color filter is used in order to approximate the relative spectral response indicating the relationship between the spectral distribution of the light flux to be measured and one stimulus value to one component of the color matching function. Generally, measuring instruments such as luminance meters, illuminometers, and color meters are used to approximate the relative spectral response indicating the relationship between the measured spectral distribution of the light flux and the spectral response function. Color filters are used. The color luminance meter described in Patent Document 1 is an example.

The relative spectral response of the measuring instrument is affected by the spectral transmittance of the color filter used in the measuring instrument. Therefore, when it is attempted to reduce the deviation of the relative spectral response of the measuring instrument from the spectral response function, an attempt is made to reduce the variation in the spectral transmittance of the color filter used in the measuring instrument. However, when an attempt is made to reduce the variation in spectral transmittance of the color filter, the production cost of the color filter increases and the production cost of the measuring instrument increases. Deviation is also called deviation or deviation.

Japanese Patent No. 5565458

The present invention aims to solve the above problems. An object of the present invention is to reduce the deviation of the relative spectral response of the measuring instrument from the spectral response function without increasing the production cost of the measuring instrument.

In the measuring instrument, the light beam to be measured is branched by a bundle fiber. Each of the plurality of light bundles obtained by the branching is transmitted through the color filter. The relative spectral responsivity realized by each of the plurality of color filters is approximated to the standard relative luminous sensitivity. The light bundle transmitted through each of the plurality of color filters is received by the light receiving sensor. Each of the plurality of light receiving sensors outputs an electrical signal corresponding to the received light bundle. The deriving mechanism derives a measured value corresponding to the spectral distribution of the light beam to be measured from the plurality of obtained electrical signals.

It is a schematic diagram which shows the luminance meter of 1st Embodiment. It is a graph which shows a relative spectral response. It is a graph which shows a standard specific luminous sensitivity and a relative spectral response. It is a flowchart which shows the method of producing a luminance meter. It is a histogram which shows distribution of a wavelength error. It is a histogram which shows distribution of a wavelength error. It is a graph which shows a relative spectral response. It is a graph which shows a standard specific luminous sensitivity and a relative spectral response. It is a schematic diagram which shows the luminance meter of 2nd Embodiment. It is a schematic diagram which shows the luminance meter of 3rd Embodiment. It is a schematic diagram which shows the luminance meter of 4th Embodiment. It is a schematic diagram which shows the color luminance meter of 5th Embodiment. It is a schematic diagram which shows the illuminometer of 6th Embodiment. It is a schematic diagram which shows the color meter of 7th Embodiment. It is a schematic diagram which shows a part of colorimeter of 7th Embodiment. It is a schematic diagram which shows a part of colorimeter of 7th Embodiment. It is a graph which shows a standard specific luminous sensitivity and a relative spectral response. It is a graph which shows a relative spectral response. It is a graph which shows a relative spectral response. It is a graph which shows a relative spectral response.

1. Introduction 1.1 Causes of variation in relative spectral response of luminance meters The relative spectral response of luminance meters is affected by the spectral transmittance of color filters used in luminance meters. For this reason, variations in the spectral transmittance of the color filter cause variations in the relative spectral response of the luminance meter. Therefore, in order to facilitate understanding of the cause of the variation in the relative spectral response of the luminance meter, the cause of the variation in the spectral transmittance of the color filter will be described below.

Also, color filters are roughly classified into absorption type and interference type. The cause of the variation in the spectral transmittance of the interference type color filter is different from the cause of the variation in the spectral transmittance of the absorption type color filter. Therefore, the cause of the variation in the spectral transmittance of the color filter will be described below for each of the case where the color filter is an absorption type and the case where the color filter is an interference type.

1.2 Causes of variation in spectral transmittance of absorption type color filters When a color filter is an absorption type, a plurality of color filters having different spectral transmittances are overlapped to obtain a color having a required spectral transmittance. A superposed body of filters is obtained. However, the spectral transmittance of the color filter varies. For this reason, there is also variation in the spectral transmittance of the color filter overlapped body.

The dispersion of the spectral transmittance of the color filter is mainly caused by the dispersion of materials.

When the color filter is a glass plate, a plurality of glass materials are mixed, the mixture is melted in a melting furnace, and the melt is solidified. The melting furnace may be a large continuous melting furnace or a batch furnace such as 96L or 16L. However, the composition and the like of the solidified product vary within and between batches. This causes variations in the spectral transmittance of the color filter.

When the absorption type color filter is an acetate film, the base is dyed with a dye. However, there are variations in the color and concentration of the dye within and between batches. This causes variations in the spectral transmittance of the color filter.

1.3 Causes of variation in spectral transmittance of interference type color filter When the color filter is an interference type, a plurality of films are formed on the glass substrate, and a color filter having a required spectral transmittance is obtained.

When the color filter is an interference type, the variation in the spectral transmittance of the color filter is mainly caused by the variation in the thickness of each of the plurality of films.

When the color filter is an interference type color filter, a plurality of films are formed on the glass substrate in the film forming apparatus. Each of the plurality of films may be a dielectric film or an oxide film. The film forming apparatus may be a vacuum evaporation apparatus or a sputtering apparatus. However, the film thickness of each of the plurality of films is affected by the position of the glass substrate in the film forming apparatus, and is affected by the film forming rate indicating the relationship between the film forming time and the film thickness. For this reason, the thickness of each of the plurality of films varies from batch to batch. This causes variations in the spectral transmittance of the color filter.

1.4 Characteristics of variation in spectral transmittance of interference type color filter The change in the film thickness of each of the multiple films changes the spectral transmittance of the color filter in a complex manner. Shift in the wavelength direction. For this reason, the dispersion of the spectral transmittance of the color filter is mainly the dispersion of the wavelength of the spectral transmittance of the color filter.

1.5 Magnitude of dispersion in wavelength of spectral transmittance of interference type color filter The magnitude of variation in wavelength of spectral transmittance of color filter varies depending on the capability and size of the film forming apparatus. However, when the usual color filter production method is adopted, the variation in wavelength of the spectral transmittance of the color filter is approximately ± 2 nm within the batch and approximately ± 1 nm between the batches. And approximately ± 3 nm.

1.6 Advantages of interference-type color filters Interference-type color filters can reduce the deviation from the spectral response function of the relative spectral response of the measuring instrument compared to the absorption-type color filter. There are advantages such as small change with time. Deviation is also called deviation or deviation.

1.7 Standard for deviation of relative spectral response from spectral response function German Industrial Standard DIN 5032-7 for luminance meter is the standard ratio adopted by the International Commission on Illuminance for Relative Spectral Response S (λ) A deviation f ₁ ′ from the visibility V (λ) is defined as shown in Expression (1).

In the number (1), λ ₁ and λ ₂ are the lower limit and the upper limit of the visible wavelength region, respectively.

German Industrial Standard DIN 5032-7 is when the relative spectral response S (λ) of the luminance meter deviates from the standard relative luminous sensitivity V (λ) f ₁ ′ is less than 2%, less than 3% and less than 6% Are defined as L class, A class, and B class, respectively.

In this way, since the grade relating to the deviation f ₁ ′ of the relative spectral response S (λ) of the luminance meter from the standard relative visibility V (λ) is defined in the luminance meter, the luminance meter is produced. The quality of the luminance meter is managed so that the deviation f ₁ ′ of the relative spectral response S (λ) of the luminance meter from the standard relative luminous sensitivity V (λ) is within the specified range.

The Japanese Industrial Standard JIS C-1609-1 for illuminometers similarly defines the deviation f ₁ ′ of the relative spectral response S (λ) of the illuminometer from the standard relative luminous sensitivity V (λ). The luminometer grades when the deviation f ₁ ′ of S (λ) from the standard relative luminous sensitivity V (λ) is less than 3%, less than 6% and less than 9% are classified into precision class, class A and AA, respectively. Class.

1.8 Example of deviation of the relative spectral response of the luminance meter from the standard relative luminous sensitivity When the luminance meter is produced, from the standard relative luminous sensitivity V (λ) of the relative spectral response S (λ) of the luminance meter. An attempt is made to reduce the deviation f ₁ ′. However, the spectral transmittance of the color filter varies. For this reason, the relative spectral response S (λ) of the luminance meter also varies, and the deviation f ₁ ′ of the relative spectral response S (λ) of the luminance meter from the standard relative luminous sensitivity V (λ) also varies. is there.

In addition, the relative spectral response realized by the color filter can be approximated to the standard relative luminous sensitivity V (λ), but the relative spectral response realized by the color filter completely matches the standard relative luminous sensitivity V (λ). It is difficult to make it. For this reason, the relative spectral response realized by the best color filter does not completely match the standard relative luminous sensitivity V (λ). The deviation f ₁ ′ does not become zero.

These will be explained with specific examples.

The graph in FIG. 17 shows the relative spectral response realized by the standard specific luminous efficiency and the best color filter.

As shown in FIG. 17, the relative spectral response realized by the best color filter is approximated to the standard relative luminous sensitivity V (λ). However, the relative spectral response realized by the best color filter does not completely match the standard relative luminous sensitivity V (λ). For this reason, the deviation f ₁ ′ of the relative spectral response realized by the best color filter from the standard relative luminous sensitivity V (λ) is not 0% but 1.6%.

The graph in FIG. 18 shows the relative spectral response realized by the best color filter and the relative spectral response realized by the color filter having a wavelength error Δλ of −0.2 nm. The graph of FIG. 19 shows the relative spectral response realized by the best color filter and the relative spectral response realized by the color filter having a wavelength error Δλ of −1.0 nm. The graph of FIG. 20 shows the relative spectral response realized by the best color filter and the relative spectral response realized by the color filter having a wavelength error Δλ of −2.1 nm.

The wavelength error Δλ of the color filter is a difference obtained by subtracting the centroid wavelength of the relative spectral response realized by the best color filter from the centroid wavelength of the relative spectral response realized by the color filter.

The deviation f ₁ ′ of the relative spectral response realized by the color filter having the wavelength error Δλ of −0.2 nm from the standard relative luminous sensitivity V (λ) is 2.0%. Therefore, when the absolute value of the wavelength error Δλ of the color filter is less than 0.2 nm, the deviation f ₁ ′ of the relative spectral response from the standard relative luminous sensitivity V (λ) is less than 2.0%, and the luminance The total grade is L level.

The deviation f ₁ ′ of the relative spectral response realized by the color filter having the wavelength error Δλ of −1.0 nm from the standard relative luminous sensitivity V (λ) is 3.0%. For this reason, when the absolute value of the wavelength error Δλ of the color filter is less than 1.0 nm, the deviation f ₁ ′ of the relative spectral response from the standard relative luminous sensitivity V (λ) is less than 3.0%, and the luminance The total grade is A grade.

The deviation f ₁ ′ of the relative spectral response realized by the color filter having the wavelength error Δλ of −2.1 nm from the standard relative luminous sensitivity V (λ) is 6.4%. For this reason, when the absolute value of the wavelength error Δλ of the color filter is 2.1 nm or more, the deviation f ₁ ′ of the relative spectral responsivity from the standard relative luminous sensitivity V (λ) is 6.4% or more, and the luminance The total grade is not even B grade.

1.9 Production of color filter used in luminance meter When the normal production method is adopted, the wavelength variation of the spectral transmittance of the interference type color filter is approximately ± 3 nm. Since the variation in wavelength of the spectral transmittance of the color filter is almost the same as the variation in wavelength of the relative spectral response realized by the color filter, the variation in the wavelength of the spectral transmittance of the color filter is large. Is approximately ± 3 nm, the variation in wavelength of the relative spectral response realized by the color filter is also approximately ± 3 nm. However, when the magnitude of the wavelength variation of the relative spectral response realized by the color filter is ± 3 nm, the luminance meter is not even grade B.

For this reason, it is required to reduce the wavelength error Δλ. For this purpose, it is conceivable to employ a color filter production method in which the variation in spectral transmittance of the color filter is reduced. For example, when a plurality of films are formed on a glass substrate in a film forming apparatus, it is conceivable that the glass substrate is arranged only in a range where the change in film thickness depending on the position is small. However, such an arrangement increases the production cost of the color filter. It is also conceivable to adopt a normal color filter production method, measure the spectral transmittance of each produced color filter, and select a color filter so that the wavelength error Δλ is small. For example, when the luminance meter grade is L, it is conceivable to select a color filter having an absolute value of the wavelength error Δλ of less than 0.2 nm. However, such selection also increases the production cost of the color filter. For example, when a color filter having an absolute value of the wavelength error Δλ of less than 0.2 nm is selected, the yield rate is about 20%, which significantly increases the production cost of the color filter.

2 First Embodiment The first embodiment relates to a luminance meter. A luminance meter is a measuring instrument that measures the luminance of a light source.

2.1 Luminance Meter Hardware The schematic diagram of FIG. 1 shows the luminance meter of the first embodiment.

As shown in FIG. 1, the luminance meter 1000 includes an objective lens 1010, a field stop 1011, a bundle fiber 1012, a color filter group 1013, a light receiving sensor group 1014, a derivation mechanism 1015, a mirror 1016, and a viewfinder system 1017. The color filter group 1013 includes a first color filter 1030 and a second color filter 1031. The light receiving sensor group 1014 includes a first light receiving sensor 1040 and a second light receiving sensor 1041. The derivation mechanism 1015 includes an amplification mechanism 1050, a conversion mechanism 1051, and an arithmetic mechanism 1052. The amplification mechanism 1050 includes a first amplification circuit 1060 and a second amplification circuit 1061. The conversion mechanism 1051 includes a first conversion circuit 1070 and a second conversion circuit 1071.

The beam bundle 1080 to be measured is converged by the objective lens 1010. The objective optical system including the objective lens 1010 may be replaced with another type of objective optical system.

The peripheral light bundle 1100 of the converged light bundle 1080 is limited by the field stop 1011.

The restricted light bundle 1100 is incident on the incident end 1110 of the bundle fiber 1012. The incident light bundle 1100 is branched by the bundle fiber 1012. The first light bundle 1120 and the second light bundle 1121 obtained by the branching are emitted from the first emission end 1130 and the second emission end 1131 of the bundle fiber 1012 respectively. The branch mechanism composed of the bundle fiber 1012 may be replaced with another type of branch mechanism.

The emitted first light bundle 1120 and second light bundle 1121 are transmitted through the first color filter 1030 and the second color filter 1031, respectively. The transmitted first beam bundle 1120 and second beam bundle 1121 are received by the first light receiving sensor 1040 and the second light receiving sensor 1041, respectively. The first light receiving sensor 1040 and the second light receiving sensor 1041 output a first electric signal and a second electric signal corresponding to the received first light bundle 1120 and second light bundle 1121, respectively.

The deriving mechanism 1015 derives the luminance value LV corresponding to the spectral distribution of the light beam 1080 to be measured from the first electric signal and the second electric signal. The first electric signal and the second electric signal are amplified by the first amplifier circuit 1060 and the second amplifier circuit 1061, respectively. Hereinafter, the amplification factors when the first amplification circuit 1060 and the second amplification circuit 1061 amplify the first electric signal and the second electric signal are respectively referred to as the first amplification factor G1 and the second amplification factor. The rate is G2. When the magnitudes of the output first electric signal and second electric signal are appropriate, the first amplifier circuit 1060 and the second amplifier circuit 1061 may be omitted. The amplified first electric signal and second electric signal are converted from analog to digital into a first signal value S1 and a second signal value S2 by a first conversion circuit 1070 and a second conversion circuit 1071, respectively. Is done. The calculation mechanism 1052 is a microcomputer or the like, and calculates a luminance value LV from the first signal value S1 and the second signal value S2. The calculation mechanism 1052 stores the first coefficient C1 and the second coefficient C2, and calculates the luminance value LV based on the sum S0 = S1 × C1 + S2 × C2.

Each of the relative spectral response S1 (λ) realized by the first color filter 1030 and the relative spectral response S2 (λ) realized by the second color filter 1031 has a standard relative luminous sensitivity V (λ). Can be approximated. The relative spectral response S1 (λ) indicates the relationship between the measured spectral distribution of the light beam 1080 and the first signal value S1. The relative spectral response S2 (λ) indicates the relationship between the measured spectral distribution of the light beam 1080 and the second signal value S2. Therefore, the relative spectral response S1 (λ) and the relative spectral response S2 (λ) are mainly affected by the spectral transmittances of the first color filter 1030 and the second color filter 1031 respectively. It is also affected by the spectral transmittance of 1010 and the spectral transmittance of the bundle fiber 1012, and is also affected by the spectral sensitivity of the light receiving sensor 1040 and the light receiving sensor 1041, respectively.

The number of branches of the bundle fiber 1012 may be increased. When the number of branches of the bundle fiber 1012 is increased, according to the number of branches of the bundle fiber 1012, the number of beam bundles, the number of emission ends, the number of color filters, the number of light receiving sensors, the number of amplifier circuits, the number of conversion circuits The number, the number of electrical signals, the number of signal values, etc. are increased.

The central light bundle 1101 of the converged light bundle 1080 is reflected by the mirror 1016. The reflected light bundle 1101 is guided to the finder system 1017. The viewfinder system 1017 generates a viewfinder image from the guided light beam 1101. The mirror 1016 and the viewfinder system 1017 may be omitted.

2.2 Suppression of deviation of the relative spectral response of the luminance meter from the standard relative luminous sensitivity The following is the relative spectrum realized by the best color filter as a reference from the barycentric wavelength of the relative spectral response realized by the color filter. The difference obtained by subtracting the centroid wavelength of the response is defined as the wavelength error Δλ of the color filter.

The wavelength error Δλ of the color filter is an index expressing the wavelength shift from the relative spectral response realized by the best color filter of the relative spectral response realized by the color filter. An index other than the wavelength error Δλ of the color filter may be used. The centroid wavelength may be changed to another type of characteristic wavelength. For example, the center-of-gravity wavelength may be changed to a peak wavelength, a half-value wavelength, or the like. A relative spectral response other than the relative spectral response of the best color filter may be used as a reference. For example, the relative spectral response that matches the standard relative luminous sensitivity may be used as a reference.

Each of the first color filter 1030 and the second color filter 1031 is an interference type. For this reason, the deviation from the relative spectral response realized by the best color filter of the relative spectral response realized by each of the first color filter 1030 and the second color filter 1031 is expressed by a wavelength error. . Even when each of the first color filter 1030 and the second color filter 1031 is not an interference type, the color filter having the best relative spectral response realized by each of the first color filter 1030 and the second color filter 1031. In some cases, the deviation from the relative spectral responsivity realized by is represented by a wavelength error. Therefore, when each of the first color filter 1030 and the second color filter 1031 is not an interference type, from the standard relative luminous sensitivity V (λ) of the relative spectral response S0 (λ) employed in the luminance meter 1000. In some cases, a technique for suppressing the deviation f ₁ ′ is employed.

The wavelength error Δλ1 of the first color filter 1030 is negative, and the wavelength error Δλ2 of the second color filter 1031 is positive. Thereby, the influence ΔS1 (λ) of the wavelength error Δλ1 of the first color filter 1030 on the relative spectral response S0 (λ) of the luminance meter 1000 and the relative of the luminance meter 1000 of the wavelength error Δλ2 of the second color filter 1031. The influence ΔS2 (λ) on the spectral response S0 (λ) can be canceled out.

In the first embodiment, the second coefficient multiplied by the first coefficient C1 and the second signal value S2 multiplied by the first signal value S1 so that the influence ΔS1 (λ) and the influence ΔS2 (λ) cancel each other. Are different from each other. That is, the signal value is such that the influence ΔS1 (λ) and the influence ΔS2 (λ), which are a set of the two

color filters

1030 and 1031 of the influence ΔSi (λ) of the wavelength error Δλi of the i-th color filter cancel each other. The coefficient Ci multiplied by Si is made different between the two signal values S1 and S2.

Since the first coefficient C1 and the second coefficient C2 indicate the magnitudes of the contribution of the first electric signal and the second electric signal to the luminance value LV, respectively, in the first embodiment, By making the coefficient C1 and the second coefficient C2 different from each other, the calculation mechanism 1052 performs weighting that makes the contribution of the i-th electrical signal to the luminance value LV different between the two electrical signals. . When the weighting is performed by the calculation mechanism 1052, each of the first coefficient C1 and the second coefficient C2 is a weighting coefficient, and the sum S0 is a weighting of the first signal value S1 and the second signal value S2. Become sum.

In the first embodiment, since the weighting need not be performed by the amplification mechanism 1050, the first amplification factor G1 and the second amplification factor G2 are the same.

In the first embodiment, in order to cancel the influence ΔS1 (λ) and the influence ΔS2 (λ), the product C1 × Δλ1 obtained by multiplying the wavelength error Δλ1 of the first color filter 1030 by the first coefficient C1. The product C2 × Δλ2 obtained by multiplying the second coefficient C2 by the wavelength error Δλ2 of the second color filter 1031 cancels each other. In other words, the wavelength error Δλi of the i-th color filter is multiplied by the weighting coefficient Ci multiplied by the signal value Si obtained by converting the electric signal output from the light receiving sensor that receives the light bundle transmitted through the i-th color filter. The product C1 × Δλ1 and the product C2 × Δλ2, which are sets of the two

color filters

1030 and 1031 of the product Ci × Δλi, cancel each other.

The product C1 × Δλ1 and the product C2 × Δλ2 desirably cancel out completely. When the product C1 × Δλ1 and the product C2 × Δλ2 completely cancel each other, the sum C1 × Δλ1 + C2 × Δλ2 of the product C1 × Δλ1 and the product C2 × Δλ2 becomes zero. However, even when the product C1 × Δλ1 and the product C2 × Δλ2 do not completely cancel each other, the effect of reducing the deviation f ₁ ′ can be obtained.

According to the first embodiment, the influence ΔS1 (λ) and the influence ΔS2 (λ) cancel each other, and the relative spectral response S0 (λ) approaches the relative spectral response realized by the best color filter. As a result, the first color filter 1030 and the second color filter 1031 that can realize only the relative spectral responsivities S1 (λ) and S2 (λ) in which the deviation f ₁ ′ does not satisfy the standard, respectively, and the deviation f ₁ ′. The luminance meter 1000 having a relative spectral response S0 (λ) satisfying the standard can be realized. Therefore, the deviation f ₁ ′ can be reduced without increasing the production cost of the luminance meter 1000.

2.3 Example of suppression of deviation of relative spectral response of luminance meter from standard relative luminous sensitivity The graph of FIG. 2 shows the relative spectral response and wavelength realized by a color filter having a wavelength error Δλ of −2.1 nm. The relative spectral responsivity realized by the color filter having an error Δλ of +1.7 nm is shown. The graph of FIG. 3 shows the standard relative luminous sensitivity and the relative spectral response of the luminance meter.

The wavelength error Δλ1 of the first color filter 1030 is −2.1 nm, and the relative spectral response S1 (λ) realized by the first color filter 1030 is the relative spectral response S1 (λ) shown in FIG. In addition, the wavelength error Δλ2 of the second color filter 1031 is +1.7 nm, and the relative spectral response S2 (λ) realized by the second color filter 1031 is the relative spectral response S2 (λ) shown in FIG. For example, the first coefficient C1 is set to 0.8, and the second coefficient C2 is set to 1.0. As a result, the product C1 × Δλ1 becomes −1.7, the product C2 × Δλ2 becomes 1.7, and the product C1 × Δλ1 and the product C2 × Δλ2 cancel each other. In this case, the relative spectral response S0 (λ) of the luminance meter 1000 becomes the relative spectral response S0 (λ) shown in FIG. 3, and the standard relative luminous sensitivity of the relative spectral response S0 (λ) of the luminance meter 1000 is obtained. The deviation f ₁ ′ from V (λ) becomes 1.4%, and the luminance meter 1000 becomes L level. That is, the luminance meter 1000 that can achieve the L class can be produced using the first color filter 1030 and the second color filter 1031 that should not achieve the L class.

2.4 Method for Producing Luminometer The flowchart of FIG. 4 shows a method for producing a luminance meter.

When the luminance meter 1000 is produced, as shown in FIG. 4, color filters that are candidates for the first color filter 1030 and the second color filter 1031 are prepared in step 1140.

Subsequently, in step 1141, the wavelength error of each of the prepared color filters is measured. The wavelength error of each of the prepared color filters is measured through a step of measuring the spectral transmittance of each of the prepared color filters with a spectrophotometer. The centroid wavelength is in the wavelength range of 380-780 nm. Spectral reflectance may be measured instead of spectral transmittance. The wavelength range of 380-780 nm may be replaced with another wavelength range. The histogram of FIG. 5 shows the distribution of wavelength errors.

Subsequently, in step 1142, a color filter having a wavelength error suitable for the first color filter 1030 and a color filter having a wavelength error suitable for the second color filter 1031 are selected from the prepared color filters.

In the first embodiment, when selecting two color filters, the prepared color filters are classified into groups A1 and A2.

In groups A1 and A2, a wavelength error range that is negative and a wavelength error range that is positive are respectively defined. Class ranges 1165 and 1166 in the histogram of FIG. 5 belong to the ranges of wavelength errors defined in groups A1 and A2, respectively.

By the classification, each of the prepared color filters belongs to a group in which a range of wavelength errors including the wavelength errors of each of the prepared color filters is defined.

The color filters used as the first color filter 1030 and the second color filter 1031 are selected from the color filters belonging to the groups A1 and A2, respectively.

Subsequently, in step 1143, the luminance meter 1000 is assembled using the two selected color filters as the first color filter 1030 and the second color filter 1031.

2.5 Imaging Position and Bundle Fiber Diameter The objective lens 1010 forms an image of the beam bundle 1080 to be measured at the imaging position 1150. An opening 1160 formed in the field stop 1011 is disposed at the imaging position 1150. The incident end 1110 is arranged away from the opening 1160. As a result, the incident end 1110 is arranged away from the imaging position 1150, and the light beam 1100 enters the incident end 1110 in a state where it is not focused. When the light beam 1100 is incident on the incident end 1110 without being in focus, the diameter of the incident end 1110 is larger than that when the light beam 1100 is incident on the incident end 1110 with the light beam 1100 being in focus. Must.

The bundle fiber 1012 has a branch and has a first emission end 1130 and a second emission end 1131. The diameters of the first exit end 1130 and the second exit end 1131 are smaller than the diameter of the entrance end 1110. Thereby, even when the diameter of the incident end 1110 is increased, the entire first light beam 1120 and second light beam 1121 emitted from the first emission end 1130 and the second emission end 1131 are The first color filter 1030 and the second color filter 1031 can be transmitted through the first color filter 1030 and the second color filter 1031, respectively. The sensor 1040 and the second light receiving sensor 1041 can receive light.

3 First Modification of First Embodiment In the first modification of the first embodiment, the influence ΔS1 of the wavelength error Δλ1 of the first color filter 1030 on the relative spectral response S0 (λ) of the luminance meter 1000 λ) and the wavelength error Δλ2 of the second color filter 1031 affect the relative spectral responsivity S0 (λ) of the luminance meter 1000, and the first amplification factor G1 and the second amplification so that the influence ΔS2 (λ) cancels each other. The rates G2 can be made different from each other. That is, the influence ΔS1 (λ) which is a set of the two

color filters

1030 and 1031 of the influence ΔSi (λ) of the wavelength error Δλi of the i-th color filter on the relative spectral response S0 (λ) of the luminance meter 1000. The amplification factor Gi is made different between the two electric signals (the first electric signal and the second electric signal) so that the influence ΔS2 (λ) cancels out.

Since the first amplification factor G1 and the second amplification factor G2 indicate the magnitudes of the contribution of the first electrical signal and the second electrical signal to the luminance value LV, respectively, the first modification of the first embodiment In the example, by making the first amplification factor G1 and the second amplification factor G2 different from each other, the magnitude of the contribution of one electrical signal to the luminance value LV is changed to two electrical signals (first electrical signal). And the second electrical signal) are weighted by the amplification mechanism 1050.

In the first modification of the first embodiment, it is not necessary to perform weighting by the calculation mechanism 1052, so the first coefficient C1 and the second coefficient C2 are the same.

In the first modification of the first embodiment, the first amplification factor G1 is set to the wavelength error Δλ1 of the first color filter 1030 so that the influence ΔS1 (λ) and the influence ΔS2 (λ) cancel each other. A product G2 × Δλ2 obtained by multiplying the multiplied product G1 × Δλ1 and the second gain G2 by the wavelength error Δλ2 of the second color filter 1031 cancels each other. That is, two color filters of product Gi × Δλi, which is obtained by multiplying the amplification factor Gi when the electrical signal output from the light receiving sensor that receives the light bundle transmitted through the i-th color filter is multiplied by the wavelength error Δλi of the color filter. The product G1 × Δλ1 and the product G2 × Δλ2, which are the sets for 1030 and 1031, cancel each other.

The first amplification factor G1 and the second amplification factor G2 are set by circuit constants of elements constituting the amplifier 1 and the amplifier 2, respectively. The element used for setting the circuit constant is typically a resistor.

According to the first modification of the first embodiment, as in the first embodiment, the deviation f ₁ ′ can be reduced without increasing the production cost of the luminance meter 1000.

4 Second Modification of First Embodiment 4.1 Suppression of Relative Spectral Response of Luminometer from Standard Specific Visibility In the second modification of the first embodiment, the wavelength of the first color filter 1030 The error Δλ1 and the wavelength error Δλ2 of the second color filter 1031 cancel each other. That is, the wavelength error Δλ1 and the wavelength error Δλ2 that are a set of the two

color filters

1030 and 1031 having the wavelength error Δλi of the i-th color filter cancel each other.

In the second modification of the first embodiment, since it is not necessary to perform weighting by the calculation mechanism 1052 or the amplification mechanism 1050, the first coefficient C1 and the second coefficient C2 are set to be the same, and the first amplification is performed. The rate G1 and the second gain G2 are the same.

The histogram in Fig. 6 shows the distribution of wavelength errors.

In the second modification of the first embodiment, a color filter having a wavelength error suitable for the first color filter 1030 and a color filter having a wavelength filter suitable for the second color filter 1031 are prepared. Selected. Accordingly, a color filter having a wavelength error suitable for each of the two

color filters

1030 and 1031 included in the luminance meter 1000 is selected from the prepared color filters.

In the second modification of the first embodiment, the prepared color filters are classified into groups A1, A2, B1, B2, C1, and C2 shown in Table 1 when selecting two color filters.

In each of the groups A1, A2, B1, B2, C1, and C2, the wavelength error ranges and representative wavelength errors described in Table 1 are defined. Class ranges 1170, 1171, 1172, 1173, 1174 and 1175 in the histogram of FIG. 6 belong to the ranges of wavelength errors defined in the groups A1, A2, B1, B2, C1 and C2, respectively.

The typical wavelength errors defined for groups A1, A2, B1, B2, C1 and C2 are preferably within the range of wavelength errors defined for groups A1, A2, B1, B2, C1 and C2, respectively. Is in the middle of the range of wavelength errors defined in groups A1, A2, B1, B2, C1 and C2. The wavelength error ranges defined in the groups A2, B2, and C2 are obtained by inverting the signs of the wavelength error ranges defined in the groups A1, B1, and C1, respectively. The representative wavelength errors defined in the groups A2, B2, and C2 are obtained by inverting the signs of the representative wavelength errors defined in the groups A1, B1, and C1, respectively. The number of groups may be increased or decreased. The range of wavelength error and the representative wavelength error defined in each of the groups A1, A2, B1, B2, C1, and C2 may be changed.

The color filters used as the first color filter 1030 and the second color filter 1031 are selected from the color filters belonging to the first group and the color filters belonging to the second group, respectively. The first group and the second group are selected such that the representative wavelength error defined in the first group and the representative wavelength error defined in the second group cancel each other. For example, the color filters used as the first color filter 1030 and the second color filter 1031 may be selected from the color filters belonging to the groups A1 and A2 as shown in the combination a in Table 1. The color filters belonging to the groups B1 and B2 may be selected as shown in the combination b in Table 1, or the color filters belonging to the groups C1 and C2 as shown in the combination c in Table 1 may be selected. Good. When the representative wavelength error defined in the first group and the representative wavelength error defined in the second group completely cancel each other, the representative wavelength error defined in the first group and the second group The simple sum of the representative wavelength errors defined in (1) is zero.

According to this selection, the wavelength error Δλ1 of the first color filter 1030 and the wavelength error Δλ2 of the second color filter 1031 cancel each other. That is, the wavelength error Δλ1 and the wavelength error Δλ2 that are a set of the two

color filters

4.2 Example of suppression of deviation of relative spectral responsivity of luminance meter from standard relative luminous sensitivity The graph of FIG. 7 shows relative spectral responsivity and wavelength realized by a color filter having a wavelength error Δλ of −1.2 nm. The relative spectral responsivity realized by a color filter with an error Δλ of +0.5 nm is shown. The graph of FIG. 8 shows the standard relative luminous sensitivity and the relative spectral response of the luminance meter.

The wavelength error Δλ1 of the first color filter 1030 is −1.2 nm, and the relative spectral response S1 (λ) realized by the first color filter 1030 is the relative spectral response S1 (λ) shown in FIG. In addition, the wavelength error Δλ2 of the second color filter 1031 is +0.5 nm, and the relative spectral response S2 (λ) realized by the second color filter 1031 is the relative spectral response S2 (λ) shown in FIG. In this case, the color filters used as the first color filter 1030 and the second color filter 1031 are respectively selected from the color filters belonging to the groups B1 and B2, and the representative filters defined in the group B1 are selected. The wavelength error and the representative wavelength error defined in group B2 cancel each other. In this case, the relative spectral response S0 (λ) of the luminance meter 1000 becomes the relative spectral response S0 (λ) shown in FIG. 8, and the standard relative luminous sensitivity V of the relative spectral response S0 (λ) of the luminance meter 1000 is obtained. The deviation f ₁ ′ from (λ) becomes 2.0%, and the luminance meter 1000 becomes the L level. That is, the luminance meter 1000 that can achieve the L class can be realized by using the first color filter 1030 and the second color filter 1031 that should not achieve the L class.

According to the second modification of the first embodiment, as in the first embodiment, the deviation of the relative spectral response of the luminance meter 1000 from the spectral ratio visibility is reduced without increasing the production cost of the luminance meter 1000. it can.

5 Second Embodiment The second embodiment relates to a luminance meter.

5.1 Luminance Meter Hardware The schematic diagram of FIG. 9 shows the luminance meter of the second embodiment.

As shown in FIG. 9, the luminance meter 2000 includes an objective lens 2010, a field stop 2011, a bundle fiber 2012, a color filter group 2013, a light receiving sensor group 2014, a derivation mechanism 2015, a mirror 2016, and a finder system 2017. The color filter group 2013 includes a first color filter 2030 and a second color filter 2031. The light receiving sensor group 2014 includes a first light receiving sensor 2040 and a second light receiving sensor 2041. The derivation mechanism 2015 includes a merging circuit 2050, an amplification mechanism 2051, a conversion mechanism 2052, and an arithmetic mechanism 2053. The amplification mechanism 2051 includes an amplification circuit 2060. The conversion mechanism 2052 includes a conversion circuit 2070.

The objective lens 2010, the field stop 2011, the bundle fiber 2012, the light receiving sensor group 2014, the mirror 2016, and the viewfinder system 2017 according to the second embodiment are respectively the objective lens 1010, the field stop 1011, the bundle fiber 1012, and the light receiving system according to the first embodiment. The sensor group 1014, the mirror 1016, and the finder system 1017 are the same.

The first electric signal and the second electric signal output from the light receiving sensor group 2014 are merged by the merge circuit 2050. The combined electrical signal is amplified by the amplifier circuit 2060. The amplified electrical signal is analog / digital converted into a signal value S by the conversion circuit 2070. The calculation mechanism 2053 is a microcomputer or the like, and calculates the luminance value LV from the signal value S.

The junction circuit 2050 is a circuit that connects the first light receiving sensor 2040 and the second light receiving sensor 2041 in parallel. The energy of the combined electric signal is the sum of the energy of the first electric signal and the energy of the second electric signal. The merging circuit 2050 may be a circuit that connects the first light receiving sensor 2040 and the second light receiving sensor 2041 in series.

5.2 Suppression of Deviation of Relative Spectral Response of Standard Luminance Meter from Standard Specific Visibility In the second embodiment, the wavelength error Δλ1 of the first color filter 2030 is the same as the second modification of the first embodiment. And the wavelength error Δλ2 of the second color filter 2031 cancels out. Therefore, at the stage of the first electric signal and the second electric signal, the influence ΔS1 (λ) of the wavelength error Δλ1 of the first color filter 2030 on the relative spectral response S0 (λ) of the luminance meter 2000 and the first electric signal. The influence ΔS2 (λ) of the wavelength error Δλ2 of the second color filter 2031 on the relative spectral response S0 (λ) of the luminance meter 2000 can already be canceled. As a result, the influence ΔS1 (λ) and the influence ΔS2 (λ) cancel out at the stage of the luminance value LV.

According to the second embodiment, as in the first embodiment, the deviation of the relative spectral response of the luminance meter 2000 from the spectral ratio visibility can be reduced without increasing the production cost of the luminance meter 2000. In addition, according to the second embodiment, the number of amplifier circuits and conversion circuits is reduced, and the production cost of the luminance meter 2000 is further reduced.

6 Third Embodiment The third embodiment relates to a luminance meter.

6.1 Hardware of Luminometer The schematic diagram of FIG. 10 shows the luminance meter of the third embodiment.

As shown in FIG. 10, the luminance meter 3000 includes an objective lens 3010, a field stop 3011, a bundle fiber 3012, a color filter group 3013, a light receiving sensor group 3014, a derivation mechanism 3015, a mirror 3016, and a viewfinder system 3017. The color filter group 3013 includes a first color filter 3030 and a second color filter 3031. The light receiving sensor group 3014 includes a first light receiving sensor 3040 and a second light receiving sensor 3041. The derivation mechanism 3015 includes an amplification mechanism 3050, a junction circuit 3051, a conversion mechanism 3052, and an arithmetic mechanism 3053. The amplification mechanism 3050 includes a first amplification circuit 3060 and a second amplification circuit 3061. The conversion mechanism 3052 includes a conversion circuit 3070.

The objective lens 3010, the field stop 3011, the bundle fiber 3012, the color filter group 3013, and the light receiving sensor group 3014 of the third embodiment are respectively the objective lens 1010, the field stop 1011, the bundle fiber 1012, and the color filter group of the first embodiment. 1013 and the light receiving sensor group 1014 are the same.

The first electric signal and the second electric signal output from the light receiving sensor group 3014 are amplified by the first amplifier circuit 3060 and the second amplifier circuit 3061, respectively. The amplified first electric signal and second electric signal are merged by the merge circuit 3051. The combined electrical signal is analog / digital converted to a signal value S by the conversion circuit 3070. The calculation mechanism 3053 is a microcomputer or the like, and calculates the luminance value LV from the signal value S.

6.2 Inhibition of Relative Spectral Response of Luminance Meter from Standard Specific Visibility In the third embodiment, the wavelength error Δλ1 of the first color filter 3030 is the same as in the first modification of the first embodiment. Of the luminance meter 3000 on the relative spectral response S0 (λ) ΔS1 (λ) and the wavelength error Δλ2 of the second color filter 3031 on the luminance meter 3000 relative spectral response S0 (λ) ΔS2 (λ ) Are weighted by the amplification mechanism 3050 so as to cancel each other. For this reason, the influence ΔS1 (λ) and the influence ΔS2 (λ) can already be canceled at the stage of the amplified first electric signal and second electric signal. As a result, the influence ΔS1 (λ) and the influence ΔS2 (λ) cancel out at the stage of the luminance value LV.

According to the third embodiment, similarly to the first embodiment, the deviation of the relative spectral response of the luminance meter 3000 from the spectral relative luminous sensitivity can be reduced without increasing the production cost of the luminance meter 3000. In addition, according to the third embodiment, the number of conversion circuits is reduced, and the production cost of the luminance meter 3000 is further reduced.

7 Fourth Embodiment The fourth embodiment relates to a luminance meter.

7.1 Luminance Meter Hardware The schematic diagram of FIG. 11 shows the luminance meter of the fourth embodiment.

11, the luminance meter 4000 includes an objective lens 4010, a field stop 4011, a bundle fiber 4012, a color filter group 4013, a light receiving sensor group 4014, a lead-out mechanism 4015, a mirror 4016, and a finder system 4017. The color filter group 4013 includes a first color filter 4030, a second color filter 4031, and a third color filter 4032. The light receiving sensor group 4014 includes a first light receiving sensor 4040, a second light receiving sensor 4041, and a third light receiving sensor 4042. The derivation mechanism 4015 includes an amplification mechanism 4050, a conversion mechanism 4051, and an arithmetic mechanism 4052. The amplification mechanism 4050 includes a first amplification circuit 4060, a second amplification circuit 4061, and a third amplification circuit 4062. The conversion mechanism 4051 includes a first conversion circuit 4070, a second conversion circuit 4071, and a third conversion circuit 4072.

The objective lens 4010, the field stop 4011, the mirror 4016, and the finder system 4017 of the fourth embodiment are the same as the objective lens 1010, the field stop 1011, the mirror 1016, and the finder system 1017 of the first embodiment, respectively.

The light beam 4100 limited by the field stop 4011 is incident on the incident end 4110 of the bundle fiber 4012. The incident light bundle 4100 is branched by the bundle fiber 4012. The first beam bundle 4120, the second beam bundle 4121, and the third beam bundle 4122 obtained by the branching are respectively the first emission end 4130, the second emission end 4131, and the third emission ray of the bundle fiber 4012. The light is emitted from the end 4132.

The emitted first light bundle 4120, second light bundle 4121, and third light bundle 4122 are transmitted through the first color filter 4030, the second color filter 4031, and the third color filter 4032, respectively. The transmitted first light bundle 4120, second light bundle 4121, and third light bundle 4122 are received by the first light receiving sensor 4040, the second light receiving sensor 4041, and the third light receiving sensor 4042, respectively. . The first light receiving sensor 4040, the second light receiving sensor 4041, and the third light receiving sensor 4042 respectively correspond to the first light bundle 4120, the second light bundle 4121, and the third light bundle 4122 that are received. 1 electrical signal, 2nd electrical signal, and 3rd electrical signal are output.

The deriving mechanism 4015 derives the luminance value LV corresponding to the spectral distribution of the light beam 4080 to be measured from the first electric signal, the second electric signal, and the third electric signal. The first electric signal, the second electric signal, and the third electric signal are amplified by the first amplifier circuit 4060, the second amplifier circuit 4061, and the third amplifier circuit 4062, respectively. Hereinafter, the amplification factor when the first amplifier circuit 4060, the second amplifier circuit 4061, and the third amplifier circuit 4062 amplify the first electric signal, the second electric signal, and the third electric signal is expressed as The first amplification factor G1, the second amplification factor G2, and the third amplification factor G3, respectively. The amplified first electric signal, second electric signal, and third electric signal are converted into a first signal value by the first conversion circuit 4070, the second conversion circuit 4071, and the third conversion circuit 4072, respectively. Analog / digital conversion is performed into S1, the second signal value S2, and the third signal value S3. The calculation mechanism 4052 is a microcomputer or the like, and calculates the luminance value LV from the first signal value S1, the second signal value S2, and the third signal value S3. The calculation mechanism 4052 stores the first coefficient C1, the second coefficient C2, and the third coefficient C3, and calculates the luminance value LV based on the sum S0 = S1 × C1 + S2 × C2 + S3 × C3.

Relative spectral response S1 (λ) realized by the first color filter 4030, relative spectral response S2 (λ) realized by the second color filter 4031, and relative spectral response realized by the third color filter 4032 Each of the responsiveness S3 (λ) is approximated to the standard relative luminous sensitivity V (λ). The relative spectral response S1 (λ) indicates the relationship between the spectral distribution of the light bundle 4080 to be measured and the first signal value S1. The relative spectral response S2 (λ) indicates the relationship between the spectral distribution of the light bundle 4080 to be measured and the second signal value S2. The relative spectral response S3 (λ) indicates the relationship between the measured spectral distribution of the light beam 4080 and the third signal value S3.

7.2 Suppression of deviation of relative spectral response of luminance meter from standard relative luminous sensitivity In the fourth embodiment, in the color filter group 4013, the wavelength error Δλ1 of the first color filter 4030, the second color filter 4031, and so on. Of the third color filter 4032 and the wavelength error Δλ3 of the third color filter 4032 cancel each other. That is, the wavelength error Δλ1, the wavelength error Δλ2, and the wavelength error Δλ3, which are a set of the three

color filters

4030, 4031, and 4032 with the wavelength error Δλi of the i-th color filter cancel each other.

In the fourth embodiment, since it is not necessary to perform weighting by the calculation mechanism 4052 or the amplification mechanism 4050, the first coefficient C1, the second coefficient C2, and the third coefficient C3 are set to be the same as each other. The amplification factor G1, the second amplification factor G2, and the third amplification factor G3 are the same.

In the fourth embodiment, a color filter having a wavelength error suitable for the first color filter 4030, a color filter having a wavelength error suitable for the second color filter 4031, and a wavelength error suitable for the third color filter 4032 Is selected from the prepared color filters. Accordingly, a color filter having a wavelength error suitable for each of the three color filters included in the luminance meter 4000 is selected from the prepared color filters.

In the fourth embodiment, when selecting three color filters, the prepared color filters are classified into groups X, A1, A2, B1, B2, C1, C2, D1 and D2 shown in Table 2.

In each of the groups X, A1, A2, B1, B2, C1, C2, D1 and D2, the wavelength error ranges and representative wavelength errors described in Table 2 are defined.

The typical wavelength errors defined in groups X, A1, A2, B1, B2, C1, C2, D1, and D2 are defined in groups X, A1, A2, B1, B2, C1, C2, D1, and D2, respectively. Within the range of wavelength errors, preferably in the middle of the range of wavelength errors defined in groups X, A1, A2, B1, B2, C1, C2, D1 and D2. The wavelength error ranges defined in the groups A2, B2, C2, and D2 are obtained by inverting the signs of the wavelength error ranges defined in the groups A1, B1, C1, and D1, respectively. The representative wavelength errors defined in the groups A2, B2, C2, and D2 are obtained by inverting the signs of the representative wavelength errors defined in the groups A1, B1, C1, and D1, respectively. The number of groups may be increased or decreased. The wavelength error range and the representative wavelength error defined in each of the groups X, A1, A2, B1, B2, C1, C2, D1, and D2 may be changed.

Color filters used as the first color filter 4030, the second color filter 4031, and the third color filter 4032 are selected from the color filters belonging to the first group, the second group, and the third group, respectively. Is done. The first group, the second group, and the third group are defined in the representative wavelength error defined in the first group, the representative wavelength error defined in the second group, and the third group. The representative wavelength error is selected to cancel. For example, the color filters used as the first color filter 4030, the second color filter 4031, and the third color filter 4032 belong to the groups X, A1, and A2, respectively, as shown in the combination a in Table 1. It may be selected from color filters, may be selected from color filters belonging to groups X, B1, and B2 as shown in combination b of Table 1, or group X as shown in combination c of Table 1. , C1 and C2 may be selected from the color filters belonging to groups X, D1 and D2, as shown in the combination d of Table 1. It is also permissible that no selection is made from color filters belonging to group X in which a representative wavelength error of zero is defined. Groups A2, B2, and C2 in which the number of color filters selected from the color filters belonging to the groups A1, B1, C1, or D1 in which the representative wavelength errors that are negative are defined are positive are defined. Alternatively, it may be different from the number of color filters selected from the color filters belonging to D2. Two or more color filters may be selected from the color filters belonging to one group. For example, the color filters used as the first color filter 4030, the second color filter 4031, and the third color filter 4032 are grouped into groups D1, A2, and C2, respectively, as shown in the combination e of Table 2. You may select from the color filter which belongs, and as shown in the combination f of Table 2, you may select from the color filter which belongs to the groups D1, B2, and B2. When the representative wavelength error defined in the first group, the representative wavelength error defined in the second group, and the representative wavelength error defined in the third group completely cancel each other, the first group The sum of the representative wavelength error defined in 1), the representative wavelength error defined in the second group, and the representative wavelength error defined in the third group becomes zero.

According to this selection, the wavelength error Δλ1 of the first color filter 4030, the wavelength error Δλ2 of the second color filter 4031, and the wavelength error Δλ3 of the third color filter 4032 cancel each other. That is, the wavelength error Δλ1, the wavelength error Δλ2, and the wavelength error Δλ3, which are a set of the three

color filters

4030, 4031, and 4032 of the wavelength error of the i-th color filter cancel each other.

As in the second embodiment, the first electric signal, the second electric signal, and the third electric signal output from the light receiving sensor group 4014 are merged by the merge circuit, and the merged electric signal is amplified by the amplifier circuit. Then, the amplified electric signal may be converted into a signal value by the conversion circuit, and the calculation mechanism may calculate the luminance value LV from the signal value. Further, as in the fourth embodiment, the amplified first electric signal, second electric signal, and third electric signal output from the amplification mechanism 4050 are merged by the merge circuit, and the merged electric signal is converted. It may be converted into a signal value by a circuit, and the calculation mechanism may calculate the luminance value LV from the signal value.

As in the first embodiment, the influence ΔS1 (λ) of the wavelength error Δλ1 of the first color filter 4030 on the relative spectral response S0 (λ) of the luminance meter 4000 and the wavelength error Δλ2 of the second color filter 4031 Effect ΔS2 (λ) of Relometer 4000 on Relative Spectral Response S0 (λ) and Effect of Wavelength Error Δλ3 of Third Color Filter 4032 on Relative Spectral Response S0 (λ) of Luminometer 4000 ΔS3 (λ) Weighting may be performed by the calculation mechanism 4052 so as to cancel each other. As in the second modification of the first embodiment, weighting may be performed by the amplification mechanism 4050 so that the influence ΔS1 (λ), the influence ΔS2 (λ), and the influence ΔS3 (λ) cancel each other.

According to the fourth embodiment, similarly to the first embodiment, the deviation of the relative spectral response of the luminance meter 4000 from the spectral ratio visibility can be reduced without increasing the production cost of the luminance meter 4000.

8 Fifth Embodiment The fifth embodiment relates to a color luminance meter. A color luminance meter is a measuring instrument that measures the color and luminance of a light source.

8.1 Color Luminometer Hardware The schematic diagram of FIG. 12 shows a color luminance meter of the fifth embodiment.

As shown in FIG. 12, the color luminance meter 5000 includes an objective lens 5010, a field stop 5011, a bundle fiber 5012, a color filter group 5013X, a light receiving sensor group 5014X, a derivation mechanism 5015X, a color filter group 5013Y, a light receiving sensor group 5014Y, A derivation mechanism 5015Y, a color filter group 5013Z, a light receiving sensor group 5014Z, a derivation mechanism 5015Z, a mirror 5016, and a finder system 5017 are provided. Each of the color filter group 5013X, the color filter group 5013Y, and the color filter group 5013Z includes a first color filter 5030 and a second color filter 5031. Each of the light receiving sensor group 5014X, the light receiving sensor group 5014Y, and the light receiving sensor group 5014Z includes a first light receiving sensor 5040 and a second light receiving sensor 5041. Each of the derivation mechanism 5015X, the derivation mechanism 5015Y, and the derivation mechanism 5015Z includes an amplification mechanism 5050, a conversion mechanism 5051, and an arithmetic mechanism 5052. The amplification mechanism 5050 includes a first amplification circuit 5060 and a second amplification circuit 5061. The conversion mechanism 5051 includes a first conversion circuit 5070 and a second conversion circuit 5071.

The objective lens 5010, the field stop 5011, the mirror 5016, and the finder system 5017 of the fifth embodiment are the same as the objective lens 1010, the field stop 1011, the mirror 1016, and the finder system 1017 of the first embodiment, respectively.

The light beam 5100 limited by the field stop 5011 is incident on the incident end 5110 of the bundle fiber 5012. The incident light bundle 5100 is branched by the bundle fiber 5012. The bundle of rays 5120X, the bundle of rays 5121X, the bundle of rays 5120Y, the bundle of rays 5121Y, the bundle of rays 5120Z, and the bundle of rays 5121Z obtained by the branching are respectively the exit end 5130X, exit end 5131X, exit end 5130Y, exit end 5131Y of the bundle fiber 5012. The light is emitted from the emission end 5130Z and the emission end 5131Z.

Hereinafter, a configuration for obtaining the stimulus value X will be described. The description of the configuration for obtaining the stimulus value X is the description of the configuration for obtaining the stimulus value Y by replacing “X” and “x” in the description with “Y” and “y”, respectively. In this description, “X” and “x” in the description are read as “Z” and “z”, respectively, to explain the configuration for obtaining the stimulus value Z.

The emitted first beam bundle 5120X and second beam bundle 5121X are transmitted through the first color filter 5030 and the second color filter 5031 belonging to the color filter group 5013X, respectively. The transmitted first light bundle 5120X and second light bundle 5121X are received by the first light receiving sensor 5040 and the second light receiving sensor 5041 belonging to the light receiving sensor group 5014X, respectively. The first light receiving sensor 5040 and the second light receiving sensor 5041 belonging to the light receiving sensor group 5014X respectively include a first electric signal and a second light signal corresponding to the received first light bundle 5120X and second light bundle 5121X. Outputs electrical signals.

The deriving mechanism 5015X derives the stimulus value X corresponding to the spectral distribution of the light beam 5080 to be measured from the first electric signal and the second electric signal. The first electric signal and the second electric signal are amplified by the first amplifier circuit 5060 and the second amplifier circuit 5061 belonging to the derivation mechanism 5015X, respectively. The amplified first electric signal and second electric signal are respectively converted into the first signal value SX1 and the second signal value SX2 by the first conversion circuit 5070 and the second conversion circuit 5071 belonging to the derivation mechanism 5015X. Analog / digital conversion. An arithmetic mechanism 5052 belonging to the derivation mechanism 5015X is a microcomputer or the like, and calculates a luminance value LV from the first signal value SX1 and the second signal value SX2.

The relative spectral response S1X (λ) realized by the first color filter 5030 belonging to the color filter group 5013X and the relative spectral response S2X (λ) realized by the second color filter 5031 belonging to the color filter group 5013X. Each is approximated to the x component of the color matching function.

8.2 Suppression of Relative Spectral Response of Color Luminance Meter from Standard Specific Visibility In the fifth embodiment, the color luminance meter 5000 having the wavelength error Δλ1X of the first color filter 5030 belonging to the color filter group 5013X Influence on relative spectral response S0X (λ) ΔS1X (λ) and influence of wavelength error Δλ2X of second color filter 5031 belonging to color filter group 5013X on relative spectral response S0X (λ) of color luminance meter 5000 Weighting is performed by the calculation mechanism 5052 or the amplification mechanism 5050 so that (λ) cancels each other. In the color filter group 5013X, the wavelength error Δλ1X and the wavelength error Δλ2X may be canceled out.

According to the fifth embodiment, as in the first embodiment, the deviation of the relative spectral response of the color luminance meter 5000 from the color matching function can be reduced without increasing the production cost of the color luminance meter 5000.

9 Sixth Embodiment The sixth embodiment relates to an illuminometer. An illuminometer is a measuring instrument that measures the illuminance of a light source.

9.1 Illuminometer Hardware The schematic diagram of FIG. 13 shows an illuminometer of the sixth embodiment.

As shown in FIG. 13, the illuminometer 6000 includes a diffusing sphere 6010, a diffusing plate group 6011, a color filter group 6012, a light receiving sensor group 6013, and a derivation mechanism 6014. The diffusion plate group 6011 includes a first diffusion plate 6020, a second diffusion plate 6021, and a third diffusion plate 6022. The color filter group 6012 includes a first color filter 6030, a second color filter 6031, and a third color filter 6032. The light receiving sensor group 6013 includes a first light receiving sensor 6040, a second light receiving sensor 6041, and a third light receiving sensor 6042. The derivation mechanism 6014 includes an amplification mechanism 6050, a conversion mechanism 6051, and an arithmetic mechanism 6052. The amplification mechanism 6050 includes a first amplification circuit 6060, a second amplification circuit 6061, and a third amplification circuit 6062. The conversion mechanism 6051 includes a first conversion circuit 6070, a second conversion circuit 6071, and a third conversion circuit 6072.

Since the diffusion sphere 6010 functions as a transmission type diffusion member, the light beam 6080 to be measured is diffused by the diffusion sphere 6010 when passing through the diffusion sphere 6010. As a result, the light beam 6080 to be measured is branched by the diffusing sphere 6010. The first beam bundle 6090, the second beam bundle 6091, and the third beam bundle 6092 obtained by the branching are directed to the first diffusion plate 6020, the second diffusion plate 6021, and the third diffusion plate 6022, respectively. . The diffusing sphere 6010 that is a hemispherical diffusing member may be replaced with a non-hemispheric diffusing member. For example, the diffusion sphere 6010 may be replaced with a flat diffusion plate.

The first light beam 6090, the second light beam 6091, and the third light beam 6092 are diffused by the first diffusion plate 6020, the second diffusion plate 6021, and the third diffusion plate 6022, respectively.

The diffused first light bundle 6090, second light bundle 6091, and third light bundle 6092 are transmitted through the first color filter 6030, the second color filter 6031, and the third color filter 6032, respectively. To do. The transmitted first light bundle 6090, second light bundle 6091, and third light bundle 6092 are received by the first light receiving sensor 6040, the second light receiving sensor 6041, and the third light receiving sensor 6042, respectively. . The first light receiving sensor 6040, the second light receiving sensor 6041, and the third light receiving sensor 6042 respectively correspond to the received first light bundle 6090, second light bundle 6091, and third light bundle 6092, respectively. 1 electrical signal, 2nd electrical signal, and 3rd electrical signal are output.

The derivation mechanism 6014 calculates the illuminance value IV from the first electric signal, the second electric signal, and the third electric signal. The first electric signal, the second electric signal, and the third electric signal are amplified by the first amplifier circuit 6060, the second amplifier circuit 6061, and the third amplifier circuit 6062, respectively. The amplified first electric signal, second electric signal, and third electric signal are converted into first signal values by the first conversion circuit 6070, the second conversion circuit 6071, and the third conversion circuit 6072, respectively. Analog / digital conversion is performed into S1, the second signal value S2, and the third signal value S3. The calculation mechanism 6052 is a microcomputer or the like, and calculates the illuminance value IV from the first signal value S1, the second signal value S2, and the third signal value S3. The calculation mechanism 6052 stores the first coefficient C1, the second coefficient C2, and the third third coefficient C3, and calculates the illuminance value IV based on the sum S0 = S1 × C1 + S2 × C2 + S3 × C3. .

Relative spectral response S1 (λ) realized by the first color filter 6030, relative spectral response S2 (λ) realized by the second color filter 6031, and relative spectral response realized by the third color filter 6032 Each of the responsiveness S3 (λ) is approximated to the standard relative luminous sensitivity V (λ).

9.2 Suppression of deviation of relative spectral response of illuminometer from standard relative luminous sensitivity In the sixth embodiment, the relative spectral response S0 (λ) of the illuminometer 6000 with the wavelength error Δλ1 of the first color filter 6030. Of the second color filter 6031, the wavelength error Δλ2 of the second color filter 6031 on the relative spectral response S0 (λ) of the illuminometer 6000, and the third color filter 6032 of the wavelength error Δλ3. Weighting is performed by the calculation mechanism 6052 or the amplification mechanism 6050 so that the influence ΔS3 (λ) of the illuminometer 6000 on the relative spectral response S0 (λ) cancels out. In the color filter group 6012, the wavelength error Δλ1, the wavelength error Δλ2, and the wavelength error Δλ3 may be canceled out.

According to the sixth embodiment, as in the first embodiment, the deviation of the relative spectral response of the illuminometer 6000 from the spectral ratio visibility can be reduced without increasing the production cost of the illuminometer 6000.

10 Seventh Embodiment A seventh embodiment relates to a colorimeter. A color meter is a measuring instrument that measures the color of an object.

10.1 Colorimeter Hardware The schematic diagram of FIG. 14 shows a colorimeter of the seventh embodiment. The schematic diagram of FIG. 15 shows the measurement mechanism with which the colorimeter of 7th Embodiment is provided. The schematic diagram of FIG. 16 shows the light receiving mechanism and controller for reflected light included in the colorimeter of the seventh embodiment.

As shown in FIG. 14, the color meter 7000 includes a measurement mechanism 7010 and a controller 7011. As shown in FIGS. 14 and 15, the measurement mechanism 7010 includes a radiation mechanism 7020, a light beam separation mechanism 7021, an imaging mechanism 7022, an integrating sphere 7023, a light receiving mechanism 7024 for reflected light, and a light receiving mechanism 7025 for reference light. Is provided. The light receiving mechanism 7024 for reflected light includes a color filter group 7030X, a light receiving sensor group 7031X, a color filter group 7030Y, a light receiving sensor group 7031Y, a color filter group 7030Z, and a light receiving sensor group 7031Z, as shown in FIG. As shown in FIG. 16, the controller 7011 includes a derivation mechanism 7040X, a derivation mechanism 7040Y, and a derivation mechanism 7040Z. Each of the color filter group 7030X, the color filter group 7030Y, and the color filter group 7030Z includes a first color filter 7050 and a second color filter 7051. Each of the light receiving sensor group 7031X, the light receiving sensor group 7031Y, and the light receiving sensor group 7031Z includes a first light receiving sensor 7060 and a second light receiving sensor 7061. Each of the derivation mechanism 7040X, the derivation mechanism 7040Y, and the derivation mechanism 7040Z includes an amplification mechanism 7070, a conversion mechanism 7071, and an arithmetic mechanism 7072. The amplification mechanism 7070 includes a first amplification circuit 7080 and a second amplification circuit 7081. The conversion mechanism 7071 includes a first conversion circuit 7090 and a second conversion circuit 7091.

The radiation mechanism 7020 is a lamp + reflector + diffusion plate or the like, and emits a light beam.

The light beam separation mechanism 7021 is a half mirror or the like. The imaging mechanism 7022 is a lens or the like. The emitted light bundle is separated into a light bundle 7100 for illumination light and a light bundle 7101 for reference light by a light bundle separation mechanism 7021. The beam bundle 7100 of illumination light is imaged by the imaging mechanism 7022. The imaged light bundle 7100 of illumination light illuminates the sample.

Since the integrating sphere 7023 functions as a reflection type diffusing member, the measured light bundle 7102 obtained by the sample reflecting the light bundle 7100 of the illumination light is reflected by the integrating sphere 7023 when reflected by the integrating sphere 7023. Diffuse reflected. As a result, the beam bundle 7102 to be measured is branched by the integrating sphere 7023, and

beam bundles

7110X, 7111X, 7110Y, 7111Y, 7110Z, and 7111Z are obtained. The integrating sphere 7023 which is a spherical diffusing member may be replaced with a non-spherical reflective diffusing member.

The first light bundle 7110X and the second light bundle 7111X are transmitted through the first color filter 7050 and the second color filter 7051 belonging to the color filter group 7030X, respectively. The transmitted first light beam 7110X and second light beam 7111X are received by the first light receiving sensor 7060 and the second light receiving sensor 7061 belonging to the light receiving sensor group 7031X, respectively. The first light receiving sensor 7060 and the second light receiving sensor 7061 belonging to the light receiving sensor group 7031X respectively receive the first electric signal and the second light signal according to the received first light bundle 7110X and second light bundle 7111X. Outputs electrical signals.

The deriving mechanism 7040X derives the stimulus value X corresponding to the spectral distribution of the light beam 7102 to be measured from the first electric signal and the second electric signal. The first electric signal and the second electric signal are amplified by a first amplifier circuit 7080 and a second amplifier circuit 7081 belonging to the derivation mechanism 7040X, respectively. The amplified first electric signal and second electric signal are respectively converted into the first signal value SX1 and the second signal value SX2 by the first conversion circuit 7090 and the second conversion circuit 7091 belonging to the derivation mechanism 7040X. Is converted to The calculation mechanism 7072 belonging to the derivation mechanism 7040X is a microcomputer or the like, and calculates the stimulation value X from the first signal value SX1 and the second signal value SX2.

The relative spectral response S1X (λ) realized by the first color filter 7050 belonging to the color filter group 7030X and the relative spectral response S2X (λ) realized by the second color filter 7051 belonging to the color filter group 7030X. Each is approximated to the x component of the color matching function.

10.2 Suppression of Relative Spectral Response of Colorimeter from Color Matching Function In the seventh embodiment, the relative spectral response of the colorimeter 6000 with the wavelength error Δλ1 of the first color filter 7050 belonging to the color filter group 7030X. The weighting is performed by the calculation mechanism 7072 or the amplification mechanism 7070 so that the influence on the relative spectral response of the x component of the colorimeter of the wavelength error Δλ2 of the second color filter 7051 belonging to the color filter group 7030X is canceled out. Is done. In the color filter group 7030X, the wavelength error Δλ1 and the wavelength error Δλ2 may be canceled out.

According to the seventh embodiment, as in the first embodiment, the deviation from the color matching function of the relative spectral response of the color meter 7000 can be reduced without increasing the production cost of the color meter 7000.

1000 Luminometer 1010 Objective lens 1011 Field stop 1012 Bundle fiber 1013 Color filter group 1014 Light sensor group 1015 Derivation mechanism 1050 Amplification mechanism 1051 Conversion mechanism 1052 Calculation mechanism 2000 Luminance meter 2010 Objective lens 2011 Field stop 2012 Bundle fiber 2013 Color filter group 2014 Light reception Sensor group 2015 Deriving mechanism 2050 Junction circuit 2051 Amplifying mechanism 2052 Conversion mechanism 2053 Arithmetic mechanism 3000 Luminance meter 3010 Objective lens 3011 Field stop 3012 Bundle fiber 3013 Color filter group 3014 Light receiving sensor group 3015 Deriving mechanism 3050 Amplifying mechanism 3051 Converging circuit 3053 Conversion mechanism 3053 Arithmetic mechanism 4000 Luminance meter 4010 Objective lens 4011 Aperture 4012 Bundle fiber 4013 Color filter group 4014 Light receiving sensor group 4015 Deriving mechanism 4050 Amplifying mechanism 4051 Conversion mechanism 4052 Arithmetic mechanism 5000 Color luminance meter 5010 Objective lens 5011 Field stop 5012 Bundle fiber 5013X Color filter group 5014X Light receiving sensor group 5015Y Coloring mechanism 5013Y Filter group 5014Y Light receiving sensor group 5015Y Deriving mechanism 5013Z Color filter group 5014Z Light receiving sensor group 5015Z Deriving mechanism 5050 Amplifying mechanism 5051 Conversion mechanism 5052 Arithmetic mechanism 6000 Illuminometer 6010 Diffusion sphere 6011 Diffusion plate group 6012 Color filter group 6013 Light receiving sensor group 6014 Deriving mechanism 6050 Amplification mechanism 6051 Conversion mechanism 6052 Calculation mechanism 7000 Colorimeter 7010 Measurement mechanism 7011 Controller 7020 Radiation mechanism 7021 Ray bundle separation mechanism 7022 Imaging mechanism 7023 Integrating sphere 7024 Light reception mechanism for reflected light 7025 Light reception mechanism for reference light 7030X Color filter group 7031X Light reception sensor group 7030Y Color filter group 7031Y Light reception Sensor group 7030Z Color filter group 7031Z Light receiving sensor group 7040X Deriving mechanism 7040Y Deriving mechanism 7040Z Deriving mechanism 7070 Amplifying mechanism 7071 Conversion mechanism 7072 Computing mechanism

Claims

A branching mechanism that obtains a plurality of light bundles by branching the light bundle to be measured;
A plurality of color filters that transmit each of the plurality of light bundles, and a color filter group in which a relative spectral response realized by each of the plurality of color filters is approximated to a spectral response function;
Provided with a plurality of light receiving sensors for receiving a light bundle transmitted through each of the plurality of color filters, each of the plurality of light receiving sensors outputs a plurality of electrical signals according to the received light bundle. A group of light receiving sensors to
A derivation mechanism for deriving a measurement value corresponding to the spectral distribution of the measured light bundle from the plurality of electrical signals;
Measuring instrument.
Each of the plurality of color filters is an interference type,
The derivation mechanism determines the wavelength shift of one color filter when the wavelength shift from the relative spectral response that is a reference of the relative spectral response realized by the one color filter is the wavelength shift of the one color filter. Weighting is performed so that the magnitude of the contribution of one electrical signal to the measurement value differs among the plurality of electrical signals so that the set of the plurality of color filters with respect to the influence on relative spectral response cancels each other. The measuring instrument according to claim 1.
The derivation mechanism is
A conversion mechanism for obtaining a plurality of signal values by converting each of the plurality of electrical signals into a signal value;
An arithmetic mechanism that calculates the measurement value from the plurality of signal values and performs weighting by making a weighting coefficient to be multiplied by one signal value different between the plurality of signal values;
The measuring device according to claim 2.
When the difference between the characteristic wavelength of the relative spectral response realized by one color filter and the characteristic wavelength of the reference relative spectral response is the wavelength error of the one color filter, it passes through the one color filter. The set of the plurality of color filters cancels a product obtained by multiplying the wavelength error of one color filter by a weighting coefficient multiplied by a signal value obtained by converting an electric signal output from a light receiving sensor that receives the light beam. The measuring device according to claim 3.
The derivation mechanism is
Each of the plurality of electrical signals is amplified to obtain a plurality of amplified electrical signals, and weighting is performed by differentiating the amplification factor between the plurality of electrical signals when a single electrical signal is amplified. An amplification mechanism;
A conversion mechanism for obtaining a plurality of signal values by converting each of the plurality of amplified electrical signals into a signal value;
A calculation mechanism for calculating the measurement value from the plurality of signal values;
The measuring device according to claim 2.
The derivation mechanism is
Each of the plurality of electrical signals is amplified to obtain a plurality of amplified electrical signals, and weighting is performed by differentiating the amplification factor between the plurality of electrical signals when a single electrical signal is amplified. An amplification mechanism;
A merging circuit that obtains an electric signal after merging by merging the plurality of amplified electric signals;
A conversion mechanism for converting the combined electrical signal into a signal value;
A calculation mechanism for calculating the measured value from the signal value;
The measuring device according to claim 2.
When the difference between the characteristic wavelength of the relative spectral response realized by one color filter and the characteristic wavelength of the reference relative spectral response is the wavelength error of the one color filter, it passes through the one color filter. 7. The set of the plurality of color filters of products obtained by multiplying an amplification factor in the case of amplifying an electric signal output from a light receiving sensor that receives the light bundle, multiplied by a wavelength error of one color filter, cancels each other. Measuring instrument.
Each of the plurality of color filters is an interference type,
The measuring device according to claim 1, wherein a set of the plurality of color filters having a wavelength shift from a relative spectral response serving as a reference of the relative spectral response realized by one color filter cancels each other.
Wavelength of one color filter when the difference between the characteristic wavelength of relative spectral response realized by one color filter and the characteristic wavelength of relative spectral response serving as the reference is the wavelength error of one color filter. 9. The measuring device of claim 8, wherein the set of errors for the plurality of color filters cancels each other.
The derivation mechanism is
A conversion mechanism for obtaining a plurality of signal values by converting each of the plurality of electrical signals into a signal value;
A calculation mechanism for calculating the measurement value from the plurality of signal values;
A measuring instrument according to claim 8 or 9.
The derivation mechanism is
A merging circuit for obtaining an electric signal after merging by merging the plurality of electric signals;
A conversion mechanism for converting the combined electrical signal into a signal value;
A calculation mechanism for calculating the measured value from the signal value;
A measuring instrument according to claim 8 or 9.
The measuring device according to claim 4, 7 or 9, wherein the characteristic wavelength is a center of gravity wavelength, a peak wavelength, or a half-value wavelength.
An objective optical system for forming an image of the light beam to be measured at the imaging position;
The branching mechanism is a bundle fiber;
The bundle fiber has an incident end on which a light bundle to be measured is incident, and has a plurality of exit ends from which each of the plurality of light bundles is emitted,
The incident end is disposed away from the imaging position;
The measuring instrument according to any one of claims 1 to 12, wherein each of the plurality of light bundles is transmitted through the color filter, and the entire light bundle transmitted through the color filter is received by the light receiving sensor.
The measuring device according to any one of claims 1 to 12, wherein the branching mechanism is a transmission type diffusing member that transmits the light bundle to be measured and diffuses the transmitted light bundle to obtain the plurality of light bundles.
The measuring device according to any one of claims 1 to 12, wherein the branching mechanism is a reflection type diffusing member that reflects the light beam to be measured and diffuses the reflected light beam to obtain the plurality of light beams.
The measuring instrument according to any one of claims 1 to 15, wherein the spectral response function is a standard relative luminous sensitivity.
The plurality of light bundles is a first plurality of light bundles;
The branching mechanism further obtains a second plurality of light bundles and a third plurality of light bundles;
The color filter is a first color filter;
The plurality of color filters is a first plurality of color filters;
The spectral response function is an x component of a color matching function;
The color filter group is a first color filter group;
The light receiving sensor is a first light receiving sensor;
The plurality of light receiving sensors is a first plurality of light receiving sensors;
The light receiving sensor group is a first light receiving sensor group;
The electrical signal is a first electrical signal;
The plurality of electrical signals is a first plurality of electrical signals;
The measured value is the stimulus value X;
The derivation mechanism is a first derivation mechanism;
A second plurality of color filters that transmit each of the second plurality of light bundles, and a relative spectral response realized by each of the second plurality of color filters approximates a y component of a color matching function A second color filter group,
A second plurality of light receiving sensors for receiving a light bundle transmitted through each of the second plurality of color filters; and a second electric signal corresponding to the received light bundle is transmitted to the second plurality of light receiving sensors. A second light receiving sensor group that outputs a second plurality of electrical signals by each outputting;
A second derivation mechanism for deriving a stimulus value Y corresponding to the spectral distribution of the light bundle to be measured from the second plurality of electrical signals;
A third plurality of color filters that transmit each of the third plurality of light bundles, and a relative spectral response realized by each of the third plurality of color filters approximates a z component of a color matching function A third color filter group,
A third plurality of light receiving sensors for receiving the light bundle transmitted through each of the third plurality of color filters, and a third electrical signal corresponding to the received light bundle is sent to the third plurality of light receiving sensors; A third light receiving sensor group that outputs a third plurality of electrical signals by each output;
A third derivation mechanism for deriving a stimulus value Z corresponding to the spectral distribution of the light bundle to be measured from the third plurality of electrical signals;
The measuring instrument according to any one of claims 1 to 16, further comprising:
Preparing a color filter that is a candidate for a plurality of color filters provided in the measuring device of claim 1;
Measuring a wavelength shift from a relative spectral response serving as a reference for the relative spectral response of each of the prepared color filters;
The color filter having a wavelength shift suitable for each of the plurality of color filters provided in the measuring device of claim 1 is selected from the prepared color filters, and used as the plurality of color filters provided in the measuring device of claim 1. Selecting a plurality of color filters;
Assembling the measuring device of claim 1 using the selected plurality of color filters as a plurality of color filters included in the measuring device of claim 1;
A method for producing a measuring instrument comprising: