JP2020030050A - Optical measuring device - Google Patents

Abstract

To increase the degree of freedom for constituting components that can be adopted, without reducing the measurement accuracy.SOLUTION: An optical measuring device comprises: light receiving units 3R and 3B configured such that the ratio of the spectral sensitivity within a wavelength range to be measured of light receiving sensors 20a and 20b having photoelectric conversion units 23a and 23b is different for each wavelength; emission units 13r and 13b that limit the amount of light L to be measured incident on a converter 23a by forming emission holes 14ra and 14ba and the amount of light L to be measured on a converter 23b by forming emission holes 14rb and 14bb; data generators (I/V converters 4r and 4b, A/D converters 5r and 5b) that generate detection signal data Da and Db that can specify the signal levels of detection signals Sia and Sib; and a processing unit 8 that calculates optical parameters of the light L on the basis of the data Da and Db. The opening areas of the holes 14ra and 14ba and the holes 14rb and 14bb are made different so that the difference in the amount of the light L incident on the converters 23a and 23b falls within a predetermined light amount range.SELECTED DRAWING: Figure 1

Description

  The present invention generates data capable of specifying the signal level of the detection signal based on the detection signals output from the photoelectric conversion units of the pair of light receiving sensors, and pre-defines the measured light based on the generated data. The present invention relates to an optical measurement device configured to be able to measure the obtained optical parameter.

  As a light measuring device of this type, the applicant can measure the amounts of these red light emitted from a red light source, green light emitted from a green light source, and blue light emitted from a blue light source as light to be measured, respectively. The invention of a light amount measuring device (“light measuring device” capable of measuring “light amount” as “optical parameter”) is disclosed in the following patent documents.

  The light quantity measuring device disclosed by the applicant includes three light receiving units, a light receiving unit for red light, a light receiving unit for green light, and a light receiving unit for blue light, and each light receiving unit includes an optical filter and a photoelectric conversion unit. Each of the light receiving sensors has a pair of light receiving sensors. Further, the light quantity measuring device disclosed by the applicant has an I / V conversion unit for performing I / V conversion processing of a detection signal output from a photoelectric conversion unit of each light receiving sensor, and an output signal of the I / V conversion unit. A / D converter for A / D conversion processing, and the amount of light to be measured based on data output from the A / D converter (data that can specify the signal level of a detection signal output from the photoelectric converter) And a processing unit that calculates (measures).

  In this case, in the light amount measuring device disclosed by the applicant, a pair of light receiving sensors of each light receiving unit is configured such that the spectral sensitivity within the wavelength range to be measured by one light receiving sensor and the wavelength range to be measured by the other light receiving sensor. An optical filter for making the ratio with the spectral sensitivity of light different for each light to be measured of each wavelength within the wavelength range to be measured (an optical filter whose transmission amount decreases as the light to be measured having a longer wavelength, and a light to be measured which has a shorter wavelength) (The optical filter whose transmission amount decreases as the amount decreases). Further, in the light amount measuring device disclosed by the applicant, an I / V conversion unit for performing I / V conversion processing on a detection signal output from a photoelectric conversion unit in one of the pair of light receiving sensors, and a pair of light receiving sensors And a separate I / V conversion unit for performing I / V conversion processing on a detection signal output from the photoelectric conversion unit on the other side, and sequentially A / D-converts the output signal to both I / V conversion units. An A / D conversion unit to be processed is connected via a changeover switch.

  Accordingly, in the light amount measuring device disclosed by the applicant, data capable of specifying the signal level of the detection signal of the pair of light receiving sensors (photoelectric conversion units) is output from the A / D conversion unit for each light receiving unit. At the same time, the amounts of red light, green light, and blue light are calculated (measured) based on the data output from each A / D converter.

JP-A-2006-166797 (pages 9-25, FIG. 1-5)

  However, the light quantity measuring device disclosed by the applicant in the above-mentioned patent document has the following problems to be improved. Specifically, in the light amount measuring device disclosed by the applicant, the detection signal output from the light receiving sensor (photoelectric conversion unit) of each light receiving unit is subjected to I / V conversion processing by the I / V conversion unit, and then A / V conversion is performed. A configuration is employed in which the amount of light to be measured is calculated (measured) based on data subjected to A / D conversion processing by the D conversion unit.

  Further, in this light quantity measuring device, the optical characteristics of the optical filters in the pair of light receiving sensors are optimized for each light receiving unit (each wavelength range of the light to be measured) (optical characteristics different for each light receiving unit). By employing a sensor, the spectral sensitivity of both light receiving sensors, that is, the amount of light to be measured incident on the photoelectric conversion units of the pair of light receiving sensors is substantially the same for each light receiving unit. However, for example, an optical filter for making the ratio of the spectral sensitivity within the measurement target wavelength range different for each measurement light of each wavelength within the measurement target wavelength range, a red light receiving unit, a green light receiving unit, And when they are shared by the light receiving units for blue light (when the same optical filter is used in each of the light receiving units), the incident amount of the light to be measured to the photoelectric conversion units of both light receiving sensors in one of the light receiving units Are greatly different from each other.

  On the other hand, in this type of device, a detection signal of a pair of light receiving sensors (photoelectric conversion units) is used as an I / V conversion unit (I / V conversion element) capable of performing I / V conversion processing on a detection signal of the light receiving sensors (photoelectric conversion units). There is a “two-channel I / V conversion unit (two-channel I / V conversion element)” that can process signals in parallel. Some of the “two-channel I / V converters” have a common gain setting value for both channels (the gain cannot be set separately). In this case, when a "two-channel I / V converter" having a common gain setting value is employed and the same optical filter is employed in each light receiving unit, the amount of incident light of the light to be measured to the photoelectric conversion units of both light receiving sensors Are greatly different from each other, the detection signals of different signal levels of the two light receiving sensors (photoelectric conversion units) are similarly subjected to I / V conversion processing, and as a result, the SN of the signal of one light receiving sensor is changed. The ratio is largely different from the SN ratio of the signal for the other light receiving sensor.

  Further, although different from the light quantity measuring device disclosed by the applicant, by connecting both light receiving sensors (photoelectric conversion units) for each light receiving unit and one I / V conversion unit via a changeover switch. Alternatively, a configuration in which detection signals of both light receiving sensors (photoelectric conversion units) are sequentially subjected to I / V conversion processing by one I / V conversion unit may be employed. In this case, even when a configuration is employed in which the detection signals of both light receiving sensors (photoelectric conversion units) are subjected to I / V conversion processing by one I / V conversion unit and the same optical filter is employed in each light receiving unit, both I / V conversion units may be used. In the light-receiving unit in which the amounts of light to be measured incident on the photoelectric conversion unit of the light-receiving sensor are greatly different, detection signals of different signal levels of both light-receiving sensors (photoelectric conversion units) are similarly subjected to I / V conversion processing. As a result, the S / N ratio of the signal for one light receiving sensor and the S / N ratio of the signal for the other light receiving sensor are greatly different.

  As in the above example, when the signal-to-noise ratios of the two light receiving sensors (photoelectric conversion units) are greatly different, it is difficult to calculate the wavelength and the light amount of the light to be measured with high accuracy. For this reason, in the light amount measuring device disclosed by the applicant, an optical filter and an I / V conversion unit (data for obtaining the measurement result) that can be adopted are used in order to obtain a state in which a highly accurate measurement result can be obtained. There is a situation in which the degree of freedom of the element for generating the data (data generation unit) is reduced. Therefore, it is preferable to improve this point.

  The problem to be solved by the present invention in a light measurement device that measures three types of light to be measured, red light, green light, and blue light, has been described. In a light measuring device that measures light, or a light measuring device that measures optical parameters of light to be measured having a wide wavelength range such as a visible light range, the amount of incident light of the light to be measured on a pair of light receiving sensors is greatly different. Therefore, in the configuration in which the detection signals of the different signal levels of the two light receiving sensors are similarly subjected to the I / V conversion processing, the same problems as those described above occur.

  The present invention has been made in view of such problems to be improved, and it is an object of the present invention to provide an optical measurement device capable of sufficiently increasing the degree of freedom of applicable components without lowering measurement accuracy. Main purpose.

  In order to achieve the above object, the light measuring device according to claim 1 has a first light receiving sensor having a first photoelectric conversion unit that outputs a first detection signal according to an amount of incident light to be measured, and A second light receiving sensor having a second photoelectric conversion unit that outputs a second detection signal according to the amount of incident light to be measured is provided, and the first light receiving sensor has a spectral sensitivity within a wavelength range to be measured. A light receiving unit configured such that a ratio of the second light receiving sensor to the spectral sensitivity within the wavelength range to be measured is different for each light to be measured at each wavelength within the wavelength range to be measured; and A first light-passing hole through which light can pass; a first incident-amount limiting unit that limits an incident amount of the measured light to the first photoelectric conversion unit; A possible second light passage hole is formed for the second photoelectric conversion unit. A second incident amount limiting unit that limits an incident amount of the measured light, and first data that can specify a signal level of the first detection signal based on the first detection signal; A data generation unit configured to generate second data capable of specifying a signal level of the second detection signal based on the second detection signal; and the first detection signal specified based on the first data A processing unit that calculates a predetermined optical parameter of the measured light based on the signal level of the measured light based on the signal level of the second detection signal specified based on the second data, The first incident amount limiting unit and the second incident amount limiting unit are configured to determine an incident amount of the measured light of each wavelength within the wavelength range to be measured to the first photoelectric conversion unit and the second photoelectric conversion. Difference with the incident amount to the part A second opening area of the first opening area and the second light passage hole of the first light passage hole such that the light quantity in the constant light amount range is made different.

  According to a second aspect of the present invention, in the light measuring device according to the first aspect, an incident direction of the measured light and an incident direction of the measured light with respect to the first light receiving sensor and the second light receiving sensor. A diffusing optical system for equalizing the amount of light, wherein the first incident amount limiting unit is provided in a first emitting unit that emits the measured light to the first light receiving sensor in the diffusing optical system. The second incident amount limiting unit is provided in a second emission unit that emits the measured light to the second light receiving sensor in the diffusion optical system.

  The light measuring device according to claim 3 is the light measuring device according to claim 1 or 2, wherein the processing unit is configured to determine the first data as the predetermined optical parameter of the measured light. Based on one of the signal level of the first detection signal specified based on the second level and the signal level of the second detection signal specified based on the second data. A wavelength is calculated, and a radiation amount of the measured light is calculated based on the calculated wavelength and one of the wavelengths.

  In the optical measurement device according to the first aspect, the first light passage hole through which the light to be measured can pass is formed to limit the incident amount of the light to be measured to the first photoelectric conversion unit in the first light receiving sensor. A first incident amount limiting section and a second light passage hole through which the measured light can pass are formed to limit the incident amount of the measured light to the second photoelectric conversion section in the second light receiving sensor. A first incident amount limiting unit and a second incident amount limiting unit, wherein the first incident amount limiting unit and the second incident amount limiting unit determine an incident amount of the measured light of each wavelength within the wavelength range to be measured with respect to the first photoelectric conversion unit. The first opening area of the first light passage hole and the second opening area of the second light passage hole such that the difference between the amount of light incident on the second photoelectric conversion unit and the amount of light incident on the second photoelectric conversion unit falls within a predetermined light amount range. Is different.

  Therefore, according to the measuring apparatus of the first aspect, even when the optical filter having the transmittance of the measured light of each wavelength within the wavelength range to be measured is greatly different from that of the optical filter at the time of passing through the first light passage hole and the second filter, Since the amount of light to be measured incident on the first photoelectric conversion unit and the second photoelectric conversion unit when passing through the second light passage hole is appropriately adjusted, an optical filter having an arbitrary optical specification is adopted. A measuring device can be configured. In addition, the first detection signal of the first light receiving sensor (first photoelectric conversion unit) and the second detection signal of the second light receiving sensor (second photoelectric conversion unit) are I / V under the same processing conditions. Even if the data generator is configured with an I / V converter for conversion (such as a two-channel I / V converter having a common gain adjustment value), the signal levels of both detection signals are substantially the same. Thus, the SN ratio of the first detection signal (SN ratio of detection signal data generated by A / D conversion processing) and the SN ratio of the second detection signal (detection generated by A / D conversion processing) (SN ratio of signal data) can be set to the same level. Therefore, a highly accurate wavelength and radiation amount of the light to be measured can be calculated (measured) based on both the detection signals (both detection signal data), and the components that can be employed without reducing the measurement accuracy Since the degree of freedom of (a photoelectric conversion unit, an I / V conversion unit, and the like) can be sufficiently increased, an arbitrary component can be selected and manufactured according to required optical characteristics and component cost.

  The light measuring device according to claim 2, wherein the first light receiving sensor is provided in a diffusion optical system for equalizing the incident direction of the light to be measured and the incident amount of the light to be measured with respect to the first light receiving sensor and the second light receiving sensor. A first incident portion for emitting the measured light to the second light receiving sensor is provided in the first emitting portion for emitting the measured light to the second light receiving sensor in the diffusion optical system. Two incident amount limiting units are provided.

  Therefore, according to the optical measuring device of the second aspect, in the optical measuring device provided with the diffusion optical system, the indispensable light emitting portions are defined as the first light passing hole and the second light passing hole, and the first opening area and the second light passing hole are used. By differentiating the opening areas of the two, the emission unit can function as the first incident amount limiting unit and the second incident amount limiting unit. The number of optical components for adjusting the incident amount of the light to be measured to the first photoelectric conversion unit and the second photoelectric conversion unit is smaller than that of the configuration in which the amount limiting unit and the second incident amount limiting unit are provided. As a result, the manufacturing cost can be reduced, and the optical measurement device can be sufficiently miniaturized.

  4. The optical measurement device according to claim 3, wherein the processing unit sets the signal level of the first detection signal specified based on the first data and the second data as predetermined optical parameters of the measured light. The wavelength of the measured light is calculated based on the ratio of one of the signal levels of the second detection signal to the signal level of the second detected signal based on the calculated wavelength, and the wavelength of the measured light is calculated based on the calculated wavelength and one of the calculated wavelengths. Calculate the radiation amount. Therefore, according to the measuring device of the third aspect, it is difficult to obtain a highly accurate measurement result when the SN ratios of the two detection signals output from the two light receiving sensors (the two photoelectric conversion units) are significantly different. In addition, a sufficiently high-precision measurement result can be calculated (measured) for the radiation amount.

FIG. 2 is a configuration diagram illustrating a configuration of the optical measurement device 1. The output amount of the measured light L from the diffusion optical system 2, the incident amount of the measured light L to the photoelectric conversion units 23a and 23b, the spectral sensitivity characteristics of the light receiving sensors 20a and 20b, and the diffusion optical system 2 (the output hole 14ra , 14rb, 14ga, 14gb, 14ba, 14bb). It is a block diagram which shows the structure of 1 A of optical measuring devices-1C.

  Hereinafter, an embodiment of a light measuring device will be described with reference to the accompanying drawings.

  The light measuring device 1 shown in FIG. 1 is an example of a “light measuring device”, and includes a diffusion optical system 2, light receiving units 3R, 3G, 3B, I / V converting units 4r, 4g, 4b, and an A / D converting unit. “Wavelength (centroid wavelength)” which includes 5r, 5g, 5b, an operation unit 6, a display unit 7, a processing unit 8, and a storage unit 9 and is an example of “predetermined optical parameters” for the measured light L And "radiation dose" and various parameters calculated based on them. In this case, the measured light L is an example of “measured light”, and in this example, red light emitted from a red light source such as audio-visual equipment (projector) or lighting equipment, green light emitted from a green light source, It is assumed that measurement processing is performed on three types of measured light L of blue light emitted from a blue light source.

  On the other hand, the diffusion optical system 2 is an example of a “diffusion optical system”, and in the light measurement device 1 of the present example, the diffusion optical system 2 is configured by an “integrating sphere”. The diffusing optical system 2 diffuses the light L to be measured incident from an incident hole 12 opened in an incident portion 11 to thereby receive light receiving sensors 20a and 20b in the light receiving portion 3R and a light receiving sensor described later in the light receiving portion 3G. The incident direction and the incident amount of the measured light L on the light receiving sensors 20a and 20b, which will be described later, in the light receiving units 20a and 20b and the light receiving unit 3B are configured to be uniform. Further, in the light measuring device 1 of the present example, as shown in FIG. 1, emission holes 14ra and 14rb are formed in an emission portion 13r that emits the measured light L with respect to the light receiving portion 3R, and the light emitting portion 3G is formed with respect to the light receiving portion 3G. Outgoing holes 14ga and 14gb are formed in the outgoing portion 13g that emits the measured light L, and outgoing holes 14ba and 14bb are formed in the outgoing portion 13b that emits the measured light L to the light receiving portion 3B.

  In this case, in the light measuring device 1 (diffusion optical system 2) of the present example, the emission holes 14ra, 14ga, and 14ga in the emission portions 13r, 13g, and 13b (hereinafter, also referred to as “the emission portion 13” when these are not distinguished). 14ba (hereinafter, also referred to as “emission hole 14a” when these are not distinguished) corresponds to a “first emission part” and a “first incident amount limiting part”, and each of these emission holes 14a is a “first emission part”. One light passage hole ". Further, in the light measuring device 1 (diffusion optical system 2) of the present example, the formation site of the emission holes 14rb, 14gb, 14bb (hereinafter, also referred to as “the emission hole 14b” when these are not distinguished) in each emission unit 13. Correspond to a “second light emitting portion” and a “second incident amount limiting portion”, and each of the light emitting holes 14b corresponds to a “second light passing hole”. In the light measuring device 1 (diffusion optical system 2) of the present embodiment, the opening area (opening diameter: hole diameter) of each of the emission holes 14a and 14b is optimized for each of the light receiving units 3R, 3G, and 3B. This will be described later in detail.

  Each of the light receiving units 3R, 3G, and 3B corresponds to a “light receiving unit”, and as described above, can perform a measurement process using three types of light, ie, red light, green light, and blue light, as the light L to be measured. The light measuring device 1 includes three light receiving units 3R for receiving red light, 3G for receiving green light, and 3B for receiving blue light. The light receiving unit 3R includes light receiving sensors 20a and 20b and an optical filter 21r, the light receiving unit 3G includes light receiving sensors 20a and 20b, and an optical filter 21g, and the light receiving unit 3B includes the light receiving sensor 20a. , 20b and an optical filter 21b. Hereinafter, when the light receiving units 3R, 3G, and 3B are not distinguished, they are also referred to as “light receiving units 3”.

  In this case, the optical filters 21r, 21g, and 21b allow the light to be measured L having a wavelength within the “measurement target wavelength range” defined for each light receiving unit 3 to enter the light receiving sensors 20a and 20b. It is configured such that light having a wavelength shorter than the "wavelength range to be measured" or light having a wavelength longer than the "wavelength range to be measured" is incident on the light receiving sensors 20a and 20b. Specifically, as an example, the optical filter 21r outputs the measured light L (red light) having a wavelength within the wavelength range Hr (an example of the “measurement target wavelength range”) from the wavelength λrs to the wavelength λrl shown in FIG. While permitting incidence on the light receiving sensors 20a and 20b, the incidence of light of other wavelengths on the light receiving sensors 20a and 20b is regulated.

  The optical filter 21g is, for example, the light-receiving sensors 20a and 20b of the measured light L (green light) having a wavelength within the wavelength range Hg from the wavelength λgs to the wavelength λgl (another example of the “measurement target wavelength range”). While restricting the incidence of light of other wavelengths on the light receiving sensors 20a and 20b. Further, the optical filter 21b includes, as an example, the light receiving sensor 20a of the measured light L (blue light) having a wavelength within the wavelength range Hb from the wavelength λbs to the wavelength λbl (still another example of the “measurement target wavelength range”). While permitting incidence on the light receiving sensors 20a and 20b, the incidence on the light receiving sensors 20a and 20b is restricted while allowing incidence on the light receiving sensors 20a and 20b. In the following description, when the optical filters 21r, 21g, and 21b are not distinguished, they are also referred to as “optical filters 21”.

  The light receiving sensor 20a is an example of a “first light receiving sensor”, and includes an optical filter 22a and a photoelectric conversion unit 23a. In the light measuring device 1 of the present embodiment, the photoelectric conversion unit 23a of the light receiving sensor 20a corresponds to a “first photoelectric conversion unit”, and the photoelectric conversion unit 23a outputs the light according to the incident amount of the light L to be measured. The detected signal Sia corresponds to the “first detected signal”. Further, the light receiving sensor 20b is an example of a “second light receiving sensor”, and includes an optical filter 22b and a photoelectric conversion unit 23b. In the light measuring device 1 of the present example, the photoelectric conversion unit 23b of the light receiving sensor 20b corresponds to a “second photoelectric conversion unit”, and the photoelectric conversion unit 23b outputs the light according to the amount of incident light L to be measured. The detected signal Sib corresponds to a “second detected signal”.

  In this case, in the light measuring device 1 of the present example, as an example, the optical filter 22a in the light receiving sensor 20a of the light receiving unit 3R, the optical filter 22a in the light receiving sensor 20a of the light receiving unit 3G, and the optical filter 22a in the light receiving sensor 20a of the light receiving unit 3B. Reference numeral 22a denotes the same optical filter (optical filter having the same transmittance of the measured light L for each wavelength). Specifically, as shown by a solid line L2a in FIG. 2, the optical filter 22a constituting the light receiving sensor 20a of each light receiving unit 3 has the above-mentioned wavelength range Hr, Hg, Hb (hereinafter referred to as “wavelength range H ) With respect to light having a wavelength within a wavelength range that includes the wavelength (including the light having a longer wavelength has higher sensitivity to the photoelectric conversion unit 23a). To increase the amount of incident light), and a filter having an optical characteristic that "the longer the wavelength of light, the higher the transmittance".

  Note that, in the figure, the spectral sensitivity characteristics of the light receiving sensors 20a and 20b when the optical filter 21 and the optical filters 22a and 22b are not present (that is, all of the measured light L emitted from the diffusion optical system 2 are photoelectrically converted) The solid line L1 indicates the amount of light to be measured L incident on the photoelectric conversion units 23a and 23b when they are incident on the photoelectric conversion units 23a and 23b. Also, in the figure, the spectral sensitivity characteristic of the light receiving sensor 20a when the optical filter 21 is not present and only the optical filter 22a is present (that is, the measured light L emitted from the diffusion optical system 2 is only the optical filter 22a) Is incident on the photoelectric conversion unit 23a after passing through the light-receiving portion), and is indicated by a solid line L2a.

  In the light measuring device 1 of the present example, as an example, the optical filter 22b in the light receiving sensor 20b of the light receiving unit 3R, the optical filter 22b in the light receiving sensor 20b of the light receiving unit 3G, and the optical filter 22b in the light receiving sensor 20b of the light receiving unit 3B. Are configured with the same optical filters (optical filters having the same transmittance of the measured light L for each wavelength). Specifically, as shown by a solid line L2b in FIG. 2, the optical filter 22b constituting the light receiving sensor 20b of each light receiving unit 3 includes a light receiving sensor 20b for light having a wavelength within the wavelength range including each of the above wavelength ranges H. To satisfy the condition that the spectral sensitivity characteristics of the light-emitting device satisfy “the shorter the wavelength of light, the higher the sensitivity” (that is, the condition that “the shorter the wavelength of the light, the larger the amount of light incident on the photoelectric conversion unit 23b”). The transmittance is higher for light of shorter wavelength. "

  Note that, in the figure, the spectral sensitivity characteristics of the light receiving sensor 20b when the optical filter 21 is not present and only the optical filter 22b is present (that is, the measured light L emitted from the diffusion optical system 2 is only the optical filter 22b) Is incident on the photoelectric conversion unit 23b after passing through the photoelectric conversion unit 23b) is indicated by a solid line L2b.

  In each light receiving section 3 of the optical measuring device 1 of the present example having such optical filters 22a and 22b, the spectral sensitivity within the wavelength range (wavelength range H) to be measured by the light receiving sensor 20a and the measurement target by the light receiving sensor 20b The ratio with the spectral sensitivity within the wavelength range (wavelength range H) is different for each measured light L of each wavelength within the wavelength range to be measured.

  The photoelectric conversion unit 23a is arranged so as to be able to receive the measured light L transmitted through the optical filters 21 and 22a, and outputs a detection signal Sia according to the amount of received light. The photoelectric conversion unit 23b controls the optical filters 21 and 22b. The transmitted measurement light L is disposed so as to be able to receive the light, and outputs a detection signal Sib corresponding to the amount of received light. In this example, as an example, the photoelectric conversion units 23a and 23b made of the same product are employed to configure the light receiving sensors 20a and 20b, respectively. Thereby, when the incident amount of the measured light L on the light receiving sensor 20a is equal to the incident amount of the measured light L on the light receiving sensor 20b, the detection signals Sia and Sib of the same signal level are output from the light receiving sensors 20a and 20b, respectively. Is done.

  The I / V converters 4r, 4g, 4b (hereinafter also referred to as “I / V converter 4” when not distinguished) are A / D converters 5r, 5g, 5b (hereinafter, “A / D converters when not distinguished”). In addition, the I / V conversion unit 4r is configured to detect the data output from the photoelectric conversion units 23a and 23b (light receiving sensors 20a and 20b) of the light receiving unit 3R. The signals Sia and Sib are I / V converted to output detection signals Sva and Svb, and the I / V conversion unit 4g outputs the detection signals output from the photoelectric conversion units 23a and 23b (light receiving sensors 20a and 20b) of the light receiving unit 3G. I / V conversion of Sia and Sib to output detection signals Sva and Svb, and detection signal output from I / V conversion section 4b from photoelectric conversion sections 23a and 23b (light receiving sensors 20a and 20b) of light receiving section 3B. Sia and Sib are I / Converted to detection signals Sva, outputs the Svb.

  In this case, in the optical measurement device 1 of the present example, each of the I / V conversion units 4 can perform “I / V conversion processing” on the detection signals Sia and Sib from the light receiving sensors 20a and 20b in parallel. I / V conversion section (two-channel I / V conversion element) ". The I / V conversion unit 4 is composed of a “two-channel I / V conversion unit (two-channel I / V conversion element)” that operates with a common gain set for both channels. As a result, in the light measuring device 1 of the present embodiment, the detection signals Sia and Sib from the light receiving sensors 20a and 20b are converted under the same conversion conditions, and the detection signals Sva and Svb are output.

  The A / D conversion unit 5r performs A / D conversion processing on the detection signal Sva output from the I / V conversion unit 4r at a predetermined cycle and performs detection signal data Da (“the signal level of the first detection signal can be specified. And an A / D conversion process of the detection signal Svb output from the I / V conversion unit 4r at a predetermined cycle, and generates detection signal data Db (“second detection signal”). An example) is generated, and the generated detection signal data Da and Db are output to the processing unit 8.

  The A / D conversion unit 5g performs A / D conversion processing on the detection signal Sva output from the I / V conversion unit 4g at a predetermined cycle, and performs detection signal data Da (“the signal level of the first detection signal can be specified. Another example of the “first data” is generated, and the detection signal Svb output from the I / V conversion unit 4g is A / D-converted at a predetermined cycle to generate detection signal data Db (“the second signal”). Another example of “second data that can specify the signal level of the detection signal” is generated, and the generated detection signal data Da and Db are output to the processing unit 8.

  The A / D converter 5b subjects the detection signal Sva output from the I / V converter 4b to A / D conversion processing at a predetermined cycle and performs detection signal data Da (“The signal level of the first detection signal can be specified. Another example of the “first data” is generated, and the detection signal Svb output from the I / V conversion unit 4b is A / D-converted at a predetermined cycle to generate detection signal data Db (“second data”). Of the second data that can specify the signal level of the detection signal of the above (2), and outputs the generated detection signal data Da and Db to the processing unit 8.

  The operation unit 6 includes various operation switches for setting a measurement process condition to be described later and instructing start / stop of the measurement process, and outputs an operation signal corresponding to the switch operation to the processing unit 8. The display unit 7 displays a measurement condition setting screen, a measurement result display screen, and the like (both not shown) under the control of the processing unit 8.

  The processing unit 8 controls the light measuring device 1 as a whole. Specifically, the processing unit 8 corresponds to a “processing unit”, and when the start of the measurement process is instructed by the operation of the operation unit 6, the detection signal data Da output from each A / D conversion unit 5 , Db are stored in the storage unit 9. Further, the processing unit 8 measures the wavelength and the radiation amount of the measured light L (red light) incident on the light receiving unit 3R based on the detection signal data Da and Db output from the A / D conversion unit 5r. . Further, the processing unit 8 measures the wavelength and the radiation amount of the light to be measured L (green light) incident on the light receiving unit 3G based on the detection signal data Da and Db output from the A / D conversion unit 5g. . Further, the processing unit 8 measures the wavelength and the radiation amount of the light L to be measured (blue light) incident on the light receiving unit 3B based on the detection signal data Da and Db output from the A / D conversion unit 5b. .

  In this case, in the optical measurement device 1 of the present example, the processing unit 8 outputs, for example, from the photoelectric conversion units 23a and 23b of each light receiving unit 3 based on the detection signal data Da and Db stored in the storage unit 9. The signal levels of the detected detection signals Sia and Sib are specified, respectively, and the light receiving unit is determined based on the specified signal level of the detection signal Sia and the ratio of the signal levels of the detection signal Sib (the ratio of one of the two signal levels to the other). The wavelengths of the measured light L (red light, green light, and blue light) incident on 3 are calculated (measured). Further, the processing unit 8 calculates (measures) the radiation amount of the measured light L based on the calculated wavelength and one of the two specified signal levels, which is defined in advance.

  The storage unit 9 stores an operation program of the processing unit 8, detection signal data Da and Db output from each A / D conversion unit 5, and the like.

  Next, a process of measuring the wavelength and the amount of radiation of the measured light L by the light measuring device 1 will be described with reference to the attached drawings.

  In the measurement processing by the light measuring device 1, first, the light measurement is performed such that the measured light L (red light, green light, blue light, etc.) is incident on the entrance hole 12 in the entrance section 11 of the diffusion optical system 2. The device 1 is installed. At this time, the light L to be measured incident from the entrance hole 12 is diffused in the diffusion optical system 2, and the light L to be measured is directed from each of the emission holes 14 a and 14 b of each of the emission units 13 to each of the light receiving units 3. Is emitted.

  In this case, in the light measuring device 1 of the present embodiment, as described above, the light receiving sensor 20a of each light receiving unit 3 is configured by the same optical filter (an optical filter having the same transmittance of the measured light L for each wavelength). And an optical filter 22b composed of the same optical filter (an optical filter having the same transmittance of the measured light L for each wavelength) is provided for the light receiving sensor 20b of each light receiving unit 3. Has been established. In the light measuring device 1 of the present embodiment, when the same amount of light to be measured L is emitted from the diffusion optical system 2 to the light receiving sensors 20a and 20b, as an example, the light receiving unit of each light receiving unit 3 The spectral sensitivity characteristics of the light receiving sensors 20a and 20b within the wavelength range Hg, which is the 3G measurement target wavelength range, are substantially the same (that is, the photoelectric conversion unit of the measured light L of each wavelength within the wavelength range Hg). The optical characteristics of the two optical filters 22a and 22b are defined so that the amounts of incidence on the optical filters 23a and 23b are substantially the same. That is, in the optical filters 22a and 22b employed in the optical measurement device 1 of the present example, the transmission amounts of the measured light L of each wavelength within the wavelength range Hg are substantially the same.

  Therefore, the opening area (first opening area) of the emission hole 14a provided in the emission part 13 of the diffusion optical system 2 (integrating sphere) and the opening area (second opening area) of the emission hole 14b are made equal. At this time (that is, when the amount of light to be measured L from the diffusion optical system 2 with respect to the light receiving sensors 20a and 20b is the same), the wavelength range Hg is measured as shown by the solid lines L2a and L2b in FIG. In the light receiving section 3G within the target wavelength range, the spectral sensitivity characteristics of the two light receiving sensors 20a and 20b are almost the same, and the incident amount of the light L to be measured to the photoelectric conversion sections 23a and 23b (that is, from the photoelectric conversion sections 23a and 23b). The output detection signals Sia and Sib have the same signal level.

  For this reason, in the light receiving unit 3G, the S / N ratio of the light receiving sensor 20a (an original signal component corresponding to the incident amount of the measured light L transmitted through the optical filters 21 and 22a and incident on the photoelectric conversion unit 23a; The ratio of the noise component mixed into the detection signal Sia due to the influence of disturbance or the like, and the S / N ratio of the light receiving sensor 20b (the incident amount of the measured light L transmitted through the optical filters 21 and 22b and incident on the photoelectric conversion unit 23b) And the ratio of the original signal component corresponding to the noise component to the noise component mixed into the detection signal Sib due to the influence of disturbance or the like.

  However, in the optical measurement device 1 of the present example, as described above, the optical filter 22a having optical characteristics satisfying the condition that “the longer the wavelength of the light, the greater the amount of light incident on the photoelectric conversion unit 23a”, and The light receiving sensors 20a and 20b are configured using an optical filter 22b having optical characteristics that satisfy the condition that "the shorter the wavelength of light, the greater the amount of light incident on the photoelectric conversion unit 23b".

  As a result, in the optical filters 22a and 22b employed in the optical measurement device 1 of the present example, the transmission amount of the measured light L of each wavelength within the wavelength range Hr through the optical filter 22a is reduced by each wavelength within the wavelength range Hr. (The transmission amount of the measured light L of each wavelength within the wavelength range Hr is greater than the transmission amount of the measured light L of each wavelength within the wavelength range Hr. (Less than the transmission amount of the optical filter 22a). Further, in the optical filters 22a and 22b employed in the optical measurement device 1 of the present example, the transmission amount of the measured light L of each wavelength within the wavelength range Hb through the optical filter 22a is reduced. The transmission amount of the measured light L in the wavelength range Hb is smaller than the transmission amount of the measured light L in the wavelength range Hb. Larger than the transmission amount of the filter 22a).

  Therefore, when the opening areas (the first opening area and the second opening area) of the emission holes 14a and 14b are equal to each other (when the emission amount of the measured light L from the diffusion optical system 2 is equal). In the light receiving unit 3R having the wavelength range Hr as the wavelength range to be measured, the incident amount of the measured light L on the photoelectric conversion unit 23a is larger than the incident amount of the measured light L on the photoelectric conversion unit 23b (photoelectric conversion The incident amount of the measured light L to the unit 23b is smaller than the incident amount of the measured light L to the photoelectric conversion unit 23a), and the spectral sensitivity characteristics of both light receiving sensors 20a are higher than the spectral sensitivity characteristics of the light receiving sensor 20b ( As a result, the spectral sensitivity characteristics of both light receiving sensors 20b are lower than the spectral sensitivity characteristics of light receiving sensor 20a. As a result, the signal level of detection signal Sia becomes higher than the signal level of detection signal Sib (detection). The signal level of the signal Sib is lower than the signal level of the detection signal Sia). For this reason, in the light receiving unit 3R, the SN ratio of the light receiving sensor 20a is different from the SN ratio of the light receiving sensor 20a.

  Further, when the opening areas (the first opening area and the second opening area) of the emission holes 14a and 14b are equal to each other (when the emission amount of the measured light L from the diffusion optical system 2 is equal). In the light receiving section 3B having the wavelength range Hb as the measurement target wavelength range, the incident amount of the measured light L on the photoelectric conversion section 23a becomes smaller than the incident amount of the measured light L on the photoelectric conversion section 23b (photoelectric conversion). The incident amount of the measured light L to the unit 23b is larger than the incident amount of the measured light L to the photoelectric conversion unit 23a), and the spectral sensitivity characteristics of both light receiving sensors 20a are lower than the spectral sensitivity characteristics of the light receiving sensor 20b ( As a result, the spectral sensitivity characteristics of both light receiving sensors 20b become higher than the spectral sensitivity characteristics of light receiving sensor 20a. As a result, the signal level of detection signal Sia becomes lower than the signal level of detection signal Sib (detection signal ib signal level is higher than the signal level of the detection signal Sia). Therefore, also in the light receiving unit 3B, the SN ratio of the light receiving sensor 20a is different from the SN ratio of the light receiving sensor 20a.

  Therefore, in the light measuring device 1 of the present embodiment, in order to avoid a situation where the SN ratios of the light receiving sensors 20a and 20b in the light receiving units 3R and 3B are different, a “light emitting unit” provided in the diffusion optical system 2 is provided. The “first opening area” of the “first light passage hole (outgoing hole 14a)” in the “first incident amount limiting section” and the “second light passing hole ( The "second opening area" of the "outgoing hole 14b)" is optimized, and the incident amount of the measured light L to the light receiving sensors 20a and 20b is adjusted.

  Specifically, as described above, the optical measurement device 1 of the present example including the optical filters 22a and 22b having the same optical characteristics as the transmission amount of the measured light L of each wavelength within the wavelength range Hg. In the light receiving section 3G having the wavelength range Hg as the wavelength range to be measured, the amount of the measured light L emitted from the diffusion optical system 2 to the light receiving sensor 20a and the measured light from the diffusion optical system 2 to the light receiving sensor 20b are measured. In the state where the emission amounts of L are the same, the amounts of incidence of the measured light L on the photoelectric conversion units 23a and 23b (that is, the signal levels of the detection signals Sia and Sib output from the photoelectric conversion units 23a and 23b) are approximately the same. Becomes Therefore, the emission holes 14ga and 14gb are opened in the emission unit 13g that emits the measured light L to the light receiving unit 3G so that the aperture areas are equal. In this case, as an example, when the emission holes 14ga and 14gb are formed as round holes, the emission diameter of the light L to be measured with respect to the photoelectric conversion units 23a and 23b is set by making the opening diameters of both the emission holes 14ga and 14gb the same. The amount of incidence can be about the same.

  Further, as described above, the amount of transmission of the measured light L of each wavelength within the wavelength range Hr by the light receiving sensor 20a is greater than the amount of transmission of the measured light L of each wavelength within the wavelength range Hr by the light receiving sensor 20b. In the optical measuring device 1 of the present example provided with the optical filters 22a and 22b having the following optical characteristics, the light receiving unit 3R whose wavelength range is the wavelength range Hr to be measured is measured from the diffusion optical system 2 to the light receiving sensor 20a. A state in which the emission amount of the light L is smaller than the emission amount of the measured light L from the diffusion optical system 2 to the light receiving sensor 20b (the emission amount of the measured light L from the diffusion optical system 2 to the light receiving sensor 20b is In a state where the amount of the measured light L emitted from the system 2 to the light receiving sensor 20a is larger than the amount of the measured light L incident on the photoelectric conversion units 23a and 23b (that is, detection output from the photoelectric conversion units 23a and 23b). Faith Sia, the signal level of Sib) is comparable.

  Therefore, in the emission part 13r that emits the measured light L to the light receiving part 3R, the opening area of the emission hole 14ra is smaller than the opening area of the emission hole 14rb so that the opening area of the emission hole 14rb is smaller. The emission holes 14ra and 14rb are opened (to be larger than the opening area of 14ra) (“the amount of light to be measured of each wavelength within the wavelength range to be measured with respect to the first photoelectric conversion unit and the second photoelectric conversion amount”). The first opening area of the first light passage hole and the opening area of the second light passage hole are made different so that the difference between the amount of light incident on the converter and the amount of light within a light amount range that is defined in advance. Configuration). In this case, as an example, when the emission holes 14ra and 14rb are formed as round holes, the opening diameter of the emission hole 14ra is set to be smaller than the opening diameter of the emission hole 14rb (the opening diameter of the emission hole 14rb is set to the emission hole 14ra). Of the light to be measured L to the photoelectric conversion units 23a and 23b can be made substantially equal.

  In the optical measurement device 1 of the present embodiment, as an example, the emission amount of the measured light L from the emission hole 14ra (dashed line) is smaller than the emission amount of the measured light L from the emission hole 14rb (the amount indicated by the solid line L1). The opening area (opening diameter) of the exit hole 14ra is smaller than the opening area (opening diameter) of the exit hole 14rb so that the amount indicated by L3a) is small. Thereby, in the light measuring device 1 of this example, the light is emitted from the emission hole 14ra of the diffusion optical system 2, passes through the optical filter 21r and the optical filter 22a of the light receiving sensor 20a of the light receiving unit 3R, and enters the photoelectric conversion unit 23a. The incident amount of the measured light L (the incident amount of the wavelength within the wavelength range Hr to the photoelectric conversion unit 23a: the amount indicated by the one-dot chain line L4a) and the light emitted from the emission hole 14rb of the diffusion optical system 2 and the optical filter 21r and received light Amount of light to be measured L transmitted through the optical filter 22b in the light receiving sensor 20b of the light receiving sensor 20b of the unit 3R and incident on the photoelectric conversion unit 23b (incident amount of a wavelength within the wavelength range Hr to the photoelectric conversion unit 23b: amount indicated by a solid line L2b) ) Is about the same.

  Furthermore, as described above, the transmission amount of the measured light L of each wavelength within the wavelength range Hb through the light receiving sensor 20a is smaller than the transmission amount of the measured light L of each wavelength within the wavelength range Hb. In the optical measuring device 1 of the present example provided with the optical filters 22a and 22b having the following optical characteristics, the light receiving unit 3B having the wavelength range Hb as the wavelength range to be measured is measured from the diffusion optical system 2 to the light receiving sensor 20a. A state in which the emission amount of the light L is larger than the emission amount of the measured light L from the diffusion optical system 2 to the light receiving sensor 20b (the emission amount of the measurement light L from the diffusion optical system 2 to the light receiving sensor 20b is In a state where the amount of the measured light L emitted from the system 2 to the light receiving sensor 20a is smaller than the amount of the measured light L incident on the photoelectric conversion units 23a and 23b (that is, the detection amount output from the photoelectric conversion units 23a and 23b). Signal Sia, the signal level of Sib) is comparable.

  Therefore, in the emission section 13b that emits the measured light L to the light receiving section 3B, the opening area of the emission hole 14ba is larger than the opening area of the emission hole 14bb (the opening area of the emission hole 14bb is The emission holes 14ba and 14bb are opened (to be smaller than the opening area of the 14ba) (“the incident amount of the measured light of each wavelength within the wavelength range to be measured to the first photoelectric conversion unit and the second photoelectric conversion amount”). The first opening area of the first light passage hole and the opening area of the second light passage hole are made different so that the difference between the amount of light incident on the converter and the amount of light within a light amount range that is defined in advance. Another example of the configuration "is"). In this case, as an example, when the emission holes 14ba, 14bb are formed as round holes, the opening diameter of the emission hole 14ba is set to be larger than the opening diameter of the emission hole 14bb (the opening diameter of the emission hole 14bb is set to the emission hole). By making the diameter smaller than the opening diameter of 14ba), the incident amount of the measured light L to the photoelectric conversion units 23a and 23b can be made substantially equal.

  In the optical measurement device 1 of the present embodiment, as an example, the emission amount of the measured light L from the emission hole 14bb (two points) is smaller than the emission amount of the measured light L from the emission hole 14ba (the amount indicated by the solid line L1). The opening area (opening diameter) of the emission hole 14bb is smaller than the opening area (opening diameter) of the emission hole 14ba so that the amount indicated by the chain line L3b) is small. Thereby, in the light measuring device 1 of the present example, the light is emitted from the emission hole 14ba of the diffusion optical system 2, passes through the optical filter 21b and the optical filter 22a of the light receiving sensor 20a of the light receiving unit 3B, and enters the photoelectric conversion unit 23a. The incident amount of the measured light L (the incident amount of the wavelength within the wavelength range Hb to the photoelectric conversion unit 23a: the amount indicated by the solid line L2a), the optical filter 21b emitted from the emission hole 14bb of the diffusion optical system 2, and the light receiving unit The incident amount of the light L to be measured that passes through the optical filter 22b in the 3B light receiving sensor 20b and enters the photoelectric conversion unit 23b (the incident amount of the wavelength within the wavelength range Hb to the photoelectric conversion unit 23b: indicated by a two-dot chain line L4b) Amount) is about the same.

  In this case, the opening area (opening diameter) of the emission hole 14a and the opening area (opening diameter) of the emission hole 14b are determined based on the optical characteristics of the optical filters 22a and 22b. The difference between the amount of incident light and the amount of incident light to be measured L incident on the photoelectric conversion unit 23b is defined to be “a light amount within a predetermined light amount range”. More specifically, as an example, one-half of the larger one of the incident amount of the measured light L to the photoelectric conversion unit 23a and the incident amount of the measured light L to the photoelectric conversion unit 23b (the photoelectric conversion unit 23a Of the measured light L incident on the photoelectric conversion unit 23b and the smaller one of the incident amounts of the measured light L incident on the photoelectric conversion unit 23b) are defined as a “predetermined light amount range”, The opening areas (opening diameters) of the two emission holes 14a and 14b are made different so that the difference between the amount of incidence of the measurement light L and the amount of incidence of the measured light L on the photoelectric conversion unit 23b is within this light amount range. .

  Further, in the light measuring device 1 of the present embodiment, not only the above conditions are satisfied, but also the emission holes 14a for each light receiving unit 3 such that the spectral sensitivity of the light receiving sensors 20a and 20b is inverted within the measurement wavelength range. The opening area (opening diameter) and the opening area (opening diameter) of the exit hole 14b are defined so that the output amounts of the measured light L from the diffusion optical system 2 to the light receiving sensors 20a and 20b are different.

  Specifically, in the optical measurement device 1 of this example, when the incident amount of the measured light L having the shortest wavelength in the wavelength range to be measured to the photoelectric conversion unit 23a is smaller than the incident amount to the photoelectric conversion unit 23b. The opening area (opening diameter) of the emission hole 14a and the amount of light to be measured having the longest wavelength in the measurement target wavelength range to the photoelectric conversion unit 23a are larger than the amount of incidence to the photoelectric conversion unit 23b. The opening area (opening diameter) of the emission hole 14b is defined. Thereby, as shown by the dashed-dotted line L4a and the solid line L2b in FIG. 2, in the light receiving section 3R having the wavelength range Hr as the measurement target wavelength range, when the measured light L having the wavelength λrs enters the light receiving sensors 20a and 20b, And when the wavelength λrl is incident on the light receiving sensors 20a and 20b, the incident amounts of the measured light L to the photoelectric conversion units 23a and 23b are substantially the same, and the signal levels of the detection signals Sia and Sib are substantially the same. Becomes

  In the optical measurement device 1 of the present example, when the amount of light to be measured L having the shortest wavelength in the wavelength range to be measured is incident on the photoelectric conversion unit 23a more than the amount of light incident on the photoelectric conversion unit 23b, The opening area (opening diameter) and the exit hole 14b of the exit hole 14a are set such that the incident amount of the measured light L having the longest wavelength in the wavelength range on the photoelectric conversion unit 23a is smaller than the incident amount on the photoelectric conversion unit 23b. The opening area (opening diameter) is defined. As a result, as shown by the solid line L2a and the two-dot chain line L4b in FIG. 2, in the light receiving unit 3B having the wavelength range Hb as the measurement target wavelength range, when the measured light L having the wavelength λbs enters the light receiving sensors 20a and 20b. , And the wavelength λbl are incident on the light receiving sensors 20a and 20b, the incident amounts of the measured light L on the photoelectric conversion units 23a and 23b are substantially the same, and the signal levels of the detection signals Sia and Sib are the same. About.

  Therefore, in the optical measurement device 1 of this example, when the measured light L having the shortest wavelength in the wavelength range to be measured (wavelength range Hr, Hg, Hb) is incident on all of the light receiving sections 3R, 3G, 3B, and In any state when the measured light L having the longest wavelength in the wavelength range to be measured (wavelength range Hr, Hg, Hb) is incident, the SN ratios of the detection signals Sia and Sib are substantially the same.

  On the other hand, as described above, in the light receiving sensor 20a of each light receiving unit 3 on which the measured light L emitted from each emitting unit 13 of the diffusion optical system 2 is incident, the measured light L transmitted through the optical filters 21 and 22a Is received by the photoelectric conversion unit 23a, and a detection signal Sia of a current value corresponding to the amount of received light is output from the photoelectric conversion unit 23a. In the light receiving sensor 20b of each light receiving unit 3, the measured light L transmitted through the optical filter 21 is received by the photoelectric conversion unit 23b, and a detection signal Sib of a current value corresponding to the amount of received light is output from the photoelectric conversion unit 23b. Is done. Further, each I / V conversion unit 4 performs I / V conversion processing on the detection signals Sia and Sib output from the light receiving sensors 20a and 20b (photoelectric conversion units 23a and 23b) and outputs detection signals Sva and Svb. Each A / D converter 5 performs A / D conversion processing on the detection signals Sva and Svb at a predetermined cycle, and outputs detection signal data Da and Db for each light receiving unit 3 respectively. Further, the processing unit 8 causes the storage unit 9 to store the detection signal data Da and Db output from each A / D conversion unit 5.

  In this case, in the light measuring device 1 of the present embodiment, as described above, in each of the emission units 13 of the diffusion optical system 2 according to the optical characteristics of the optical filters 22a and 22b in the light receiving sensors 20a and 20b of each light receiving unit 3. The opening areas (opening diameters) of the emission holes 14a and 14b are optimized, and the amount of the measured light L incident on the photoelectric conversion units 23a and 23b of each light receiving unit 3 is substantially the same (both the light receiving sensors 20a and 20b). The spectral sensitivity characteristics in the wavelength range H of 20b are the same.) Thus, the SN ratios of the detection signals Sia and Sib output from the light receiving sensors 20a and 20b (photoelectric conversion units 23a and 23b) of each light receiving unit 3 are substantially the same.

  Further, in the optical measurement device 1 of this example, as described above, each of the I / V converters 4 operates in a state where a common gain is set, as described in “2 channel I / V converter (2 channel I / V converter)”. Conversion element). " Accordingly, the detection signals Sva and Svb obtained by subjecting the detection signals Sia and Sibv having the same SN ratio to the I / V conversion processing under the same conversion conditions have the same SN ratio. Accordingly, the S / N ratios of the detection signal data Da and Db obtained by subjecting the detection signals Sva and Svb to A / D conversion are substantially the same.

  In this state, when the start of the measurement process is instructed by operating the operation unit 6, the processing unit 8 determines the value of the detection signal data Da for each light receiving unit 3 (the sampling value by the A / D conversion unit 5: “ An example of a value corresponding to the "signal level of the first detection signal") and a value of the detection signal data Db (a sampling value by the A / D converter 5: a value corresponding to the "signal level of the second detection signal") The ratio of the value of the detection signal data Db to the value of the detection signal data Da: the value of the detection signal data Db / the value of the detection signal data Da is calculated. Then, based on the calculated ratios, the wavelengths of the measured light L (the respective wavelengths of red light, green light and blue light) incident on the light receiving sensors 20a and 20b of each light receiving unit 3 are specified (calculated).

  In this case, in the light measuring device 1, the optical filters 22a and 22b of the two light receiving sensors 20a and 20b in each light receiving unit 3 have the above-described optical characteristics and the amount of light incident on the photoelectric conversion units 23a and 23b. Is adopted. Therefore, as the wavelength of the light L to be measured incident on the light receiving unit 3 becomes longer, the sensitivity of the light receiving sensor 20a increases, the signal level of the detection signal Sia increases, and the sensitivity of the light receiving sensor 20b decreases. As the signal level of the detection signal Sib decreases, the shorter the wavelength of the measured light L, the lower the sensitivity of the light receiving sensor 20a, the lower the signal level of the detection signal Sia, and the higher the sensitivity of the light receiving sensor 20b. As a result, the signal level of the detection signal Sib increases.

  Therefore, the processing unit 8 determines the ratio between the signal level of the detection signal Sia specified based on the detection signal data Da and the signal level of the detection signal Sib specified based on the detection signal data Db (that is, the value of the detection signal data Da). The wavelength of the measured light L is specified (calculated) on the basis of the magnitude of the ratio of the measured signal L to the value of the detection signal data Db). Next, the processing unit 8 measures the radiation amount of the measured light L. Specifically, the processing unit 8 calculates the wavelength of the measured light L calculated immediately before, the signal level of the detection signal Sia (the value of the detection signal data Da), and the signal level of the detection signal Sib (the value of the detection signal data Db). ), And the radiation amount of the measured light L (red light) is calculated based on a radiation amount calculation coefficient (or table) that is predetermined so that the radiation amount can be calculated from the value. Thereafter, the processing unit 8 stores the calculated (measured) wavelength and radiation amount in the storage unit 9 as a measurement result, and displays the display unit 7 for each light receiving unit 3 (for each red light, green light, and blue light). , And a series of measurement processing on the measured light L is completed.

  As described above, in the optical measurement device 1, the emission hole 14a through which the measured light L can pass is formed, and the incident amount of the measured light L to the photoelectric conversion unit 23a in the light receiving sensor 20a is limited. An “incident-amount limiting unit” and a “second incident-amount limiting unit that has an emission hole 14b through which the measured light L can pass, and limits the amount of the measured light L incident on the photoelectric conversion unit 23b in the light receiving sensor 20b. And the “first incident amount limiting unit” and the “second incident amount limiting unit” are provided for the photoelectric conversion unit 23a of the measured light L of each wavelength within the “measurement wavelength range (wavelength range H)”. The "first opening area" of the emission hole 14a and the "second opening area" of the emission hole 14b such that the difference between the amount of incidence and the amount of incidence on the photoelectric conversion unit 23b is within the "predetermined light amount range". Area ".

  Therefore, according to this measuring device, even when the optical filters 22a and 22b having greatly different transmittances of the measured light L of each wavelength within the wavelength range to be measured (wavelength range H) are employed, even when the optical filters 22a and 22b pass through the emission hole 14a, Since the amount of light L to be measured incident on the photoelectric conversion units 23a and 23b when passing through the emission hole 14b is appropriately adjusted, the optical measurement device 1 is configured using an “optical filter” having an arbitrary optical specification. can do. Further, an I / V converter 4 (two-channel I / V converter having a common gain adjustment value) that performs I / V conversion of the detection signals Sia and Sib of the light receiving sensors 20a and 20b (both photoelectric converters 23a and 23b) under the same processing conditions. Even if the "data generation unit" is configured with a V conversion unit (two-channel I / V conversion element), the detection signals Sva, Sva, The Svb S / N ratio (and the S / N ratio of the detection signal data Da and Db subsequently generated by the A / D converter 5) can be set to the same level. Therefore, since a highly accurate wavelength and radiation amount of the measured light L can be calculated (measured) based on the detection signal data Da and Db, the components (photoelectrics) that can be employed without lowering the measurement accuracy. Since the degrees of freedom of the conversion units 23a and 23b and the I / V conversion unit 4) can be sufficiently increased, any part can be selected and manufactured according to the required optical characteristics and part cost.

  Further, in the light measuring device 1, the light L to be measured to the light receiving sensor 20a in the diffusion optical system 2 for making the incident direction of the light to be measured L incident on the light receiving sensors 20a and 20b and the incident amount of the light to be measured L uniform. A "first incident amount limiting portion" is provided in a "first emitting portion (emitting portion 13)" that emits light, an emission hole 14a is formed, and the light to be measured by the light receiving sensor 20b in the diffusion optical system 2 is measured. A “second incident amount limiting section” is provided in a “second emitting section (emitting section 13)” that emits the light L, and an emitting hole 14b is formed.

  Therefore, according to the light measuring device 1, in the “emission unit” (in the present example, each emission unit 13 of the diffusion optical system 2) that is essential in the “light measurement device” including the “diffusion optical system”, The exit holes (in this example, the exit holes 14a and 14b) are defined as “first light passage holes” and “second light passage holes” and have opening areas (“first opening areas” and “second opening areas”). )), The “emission unit” can function as the “first incident amount limiting unit” and the “second incident amount limiting unit”. Is used to adjust the incident amount of the measured light L to the photoelectric conversion units 23a and 23b, as compared with the configuration in which the “first incident amount limiting unit” and the “second incident amount limiting unit” are separately provided. As a result of reducing the number of optical components, manufacturing costs can be reduced. Both can be sufficiently miniaturized optical measuring apparatus 1.

  Further, in the light measuring device 1, the processing unit 8 sets the signal level and the detection signal data of the detection signal Sia specified based on the detection signal data Da as “predetermined optical parameters” for the measured light L. The wavelength of the measured light L is calculated based on the ratio of one of the signal levels of the detection signal Sib to the other determined based on Db, and the measured light L is calculated based on the calculated wavelength and one of the calculated wavelengths. Calculate the radiation amount of Therefore, according to the optical measurement device 1, when the SN ratios of the detection signals Sia and Sib output from the light receiving sensors 20a and 20b (both photoelectric conversion units 23a and 23b) are significantly different, a highly accurate measurement result can be obtained. Sufficiently accurate measurement results can be calculated (measured) for wavelengths and radiation doses that are difficult to obtain.

  Note that the configuration of the “light measuring device” is not limited to the example of the configuration of the light measuring device 1 described above. For example, the emission holes 14a and 14b provided in the emission portions 13 (the "first incident amount limiting portion" and the "second incident amount limiting portion") of the diffusion optical system 2 which is an example of the "diffusion optical system" are provided. The “first light passage hole” and the “second light passage hole” are configured such that the opening areas (opening diameters) thereof are different from each other to adjust the incident amount of the measured light L to the photoelectric conversion units 23a and 23b. Although the optical measurement device 1 has been described as an example, instead of such a configuration (or in addition to such a configuration), as in the optical measurement device 1A shown in the left diagram of FIG. Separately from each “emission unit” (not shown) of the “system”, between the “diffusion optical system” and the light receiving unit 3 a (another example of the “light receiving unit”), the incident amount limiting unit 30 (“first unit”). Another example of the “incident amount limiting unit” and the “second incident amount limiting unit” is provided, and light passing through the incident amount limiting unit 30 is provided. By changing the opening areas (opening diameters) of 31a and 31b (another example of the “first light passage hole” and the “second light passage hole”), the light L to be measured with respect to the photoelectric conversion units 23a and 23b is changed. A configuration for adjusting the amount of incident light may be employed. In the light measuring device 1A and the light measuring devices 1B and 1C to be described later, components having the same functions as those of the light measuring device 1 are denoted by the same reference numerals, and redundant description is omitted. I do.

  In addition, an “emission unit” of the “diffusion optical system” and / or a “first incident amount restriction unit” or a “second incident amount restriction unit” are arranged between the “diffusion optical system” and the light receiving unit 3. Instead of (or in addition to) such a configuration, the “first incident-amount limiting unit” or the “second incident” is included in the “first light-receiving sensor” and the “second light-receiving sensor”. It is also possible to adopt a configuration in which a “quantity limiter” is provided (not shown).

  Specifically, for example, to limit the wavelength range to be measured, like the light receiving sensors 20a and 20b in the light receiving unit 3b (still another example of the “light receiving unit”) of the light measuring device 1B shown in the center view of FIG. Of the optical filter 21 and the signal level of the detection signal of the first photoelectric conversion unit and the signal level of the detection signal of the second photoelectric conversion unit for the measured light of each wavelength within the wavelength range to be measured. In the case where both optical filters 22a and 22b for generating the other ratio are provided, an incident amount limiting unit 30 is provided between the optical filter 21 and the optical filters 22a and 22b. A configuration is adopted in which the amount of light to be measured L incident on the photoelectric conversion units 23a and 23b is adjusted by making the opening areas (opening diameters) of the light passing holes 31a and 31b provided in the limiting unit 30 different. It can also be.

  Further, for example, like the light receiving sensors 20a and 20b in the light receiving unit 3c (still another example of the “light receiving unit”) of the optical measurement device 1C shown in the right diagram of FIG. 3, the optical filter 21 and the optical filters 22a and 22b In the case where at least one of them is provided (both in the light receiving unit 3c), the photoelectric conversion units 23a and 23b are closer to the photoelectric conversion units 23a and 23b than the optical filters 21, 22a and 22b (the exit side of the optical filters (the photoelectric conversion unit side)). : By providing an incident amount limiting portion 30 on the incident surface side of the photoelectric conversion portions 23a and 23b) and making the opening areas (opening diameters) of the light passing holes 31a and 31b provided in the incident amount limiting portion 30 different. A configuration for adjusting the amount of incident light L to be measured on the photoelectric conversion units 23a and 23b may be employed.

  Furthermore, the light measuring device 1 including the diffusion optical system 2 configured by the “integrating sphere” as the “diffusion optical system” has been described as an example. The present invention is not limited to the “reflection type diffusion optical system”, and may be configured to include a “transmission type diffusion optical system” such as a diffusion plate (an optical component that diffuses light when transmitted) as the “diffusion optical system” (FIG. Not shown).

  Further, instead of (or in addition to) the diffusion optical system, a “dispersion optical system” such as an optical fiber, a prism, and a diffraction grating is provided to provide a “first light receiving sensor” and a “second light receiving sensor”. It is also possible to adopt a configuration for equalizing the incident direction and the incident amount of the measured light L to the sensor (not shown).

  In this case, as an example, when a “branch-type optical fiber (for example, a two-branch optical fiber)” is used as the “dispersion optical system”, a fiber that guides light toward the “first light receiving sensor” is changed to “ The fiber that guides the light toward the “second light receiving sensor” functions as the “second light passing hole” and the diameter of both fibers is made different by functioning as the “first light passing hole”. It is also possible to adopt a configuration for adjusting the incident amount of the “measured light” to the “first photoelectric conversion unit” and the “second photoelectric conversion unit” (not shown). In addition, a “branch-type optical fiber” having the same diameter of the fiber that guides light toward the “first light receiving sensor” and the diameter of the fiber that guides light toward the “second light receiving sensor” is adopted. Between the two fibers and the “first light receiving sensor” and the “second light receiving sensor”, the “first incident amount limiting unit” and the “second incident amount limiting unit” such as the aforementioned incident amount limiting unit 30. It is also possible to adopt a configuration in which the “unit” is arranged to adjust the amount of “measured light” incident on the “first photoelectric conversion unit” and the “second photoelectric conversion unit” (not shown).

  Further, if the light source of the “measurement light” and the measurement optical axis of the “light measurement device” can be positioned in a state where suitable measurement is possible, the “diffusion optical system” or “dispersion optical system” is not provided. An “optical measurement device” can also be configured.

  Further, the light to be measured L with respect to the photoelectric conversion unit 23a as the “first photoelectric conversion unit” is set such that the light having a longer spectral sensitivity characteristic of the light receiving sensor 20a as the “first light receiving sensor” has higher sensitivity. The optical filter 22a for limiting the amount of incident light and the photoelectric conversion as the "second photoelectric conversion unit" such that the light having a shorter spectral sensitivity characteristic of the light receiving sensor 20b as the "second light receiving sensor" has higher sensitivity. Although the configuration including the optical filter 22b for limiting the incident amount of the light L to be measured to the portion 23b has been described as an example, the light having a shorter spectral sensitivity characteristic of the “first light receiving sensor” has higher sensitivity. As described above, the optical filter for limiting the incident amount of the “measured light” to the “first photoelectric conversion unit” and the light having a longer spectral sensitivity characteristic of the “second light receiving sensor” have higher sensitivity. Second It can be configured with an optical filter for limiting the amount of incident "measured light" for the photoelectric conversion unit "(not shown).

  Further, under the condition that the rates of change in sensitivity within the measurement wavelength range are different from each other, light having a longer wavelength has both the spectral sensitivity characteristic of the “first light receiving sensor” and the spectral sensitivity characteristic of the “second light receiving sensor”. An optical filter for limiting the amount of the “measured light” incident on the “first photoelectric conversion unit” and the “second photoelectric conversion unit” so as to increase the sensitivity (not shown), or The “first photoelectric conversion unit” and the “second photoelectric conversion unit” are configured such that both the spectral sensitivity characteristics of the “first light receiving sensor” and the spectral sensitivity characteristics of the “second light receiving sensor” have higher sensitivity as the light has a shorter wavelength. It is also possible to provide an optical filter (not shown) for limiting the amount of the “light to be measured” incident on the “photoelectric conversion unit”.

  Further, an optical filter such as the optical filters 22a and 22b described above (a light receiving sensor (photoelectric conversion for each wavelength within the wavelength range to be measured) is provided in one of the "first light receiving sensor" and the "second light receiving sensor". It is also possible to adopt a configuration in which an optical filter for changing the sensitivity of the unit is provided and the other is not provided with such an optical filter. Even when only one of the two “light receiving sensors” is provided with the optical filter as described above, the “first light” of the “light to be measured” is determined by the presence of the optical filter provided on one of the “light receiving sensors”. The amount of light incident on the “photoelectric conversion unit” and the amount of light incident on the “second photoelectric conversion unit” are different for each wavelength within the wavelength range to be measured. In the same manner as the configuration provided with, the wavelength (center-of-gravity wavelength) and the radiation amount of the “measured light” can be suitably calculated (measured).

  In this case, in the configuration in which the optical filter as described above is provided only in one of the two “light receiving sensors”, the “first opening area (first opening area)” of the “first light passage hole” in the “first incident amount limiting unit” is used. "A second opening area (an opening diameter in the case of a round hole)" of the "second light passage hole" in the "second incident light amount limiting portion". When the optical filter is not used, the amount of the “measured light” incident on the “photoelectric conversion unit” of the “light receiving sensor” without the optical filter is reduced by the amount that the “measured light” is not attenuated due to the presence of the optical filter. Is greater than the amount of “measured light” incident on the “photoelectric conversion unit” of the “light receiving sensor” provided with As a result, a state in which the SN ratios of the two “light receiving sensors (photoelectric conversion units)” are greatly different is obtained.

  Therefore, in the configuration in which the optical filter is provided only on one of the two “light receiving sensors”, the amount of “measured light” incident on the “photoelectric conversion unit” of the “light receiving sensor” without the optical filter is limited. The “light passage hole (either the first light passage hole or the second light passage hole)” in the “incident amount limiting portion (one of the first incident amount limiting portion and the second incident amount limiting portion)” The opening area (opening diameter in the case of a round hole) of the “light-receiving sensor” provided with an optical filter limits the amount of incident “light to be measured” to the “photoelectric conversion unit”. (The other of the first incident amount restricting portion and the second incident amount restricting portion) "has the opening area of the" light passage hole (the other of the first light passage hole and the second light passage hole) "(of the round hole). In both cases, the “incident amount limiting part” is configured to be smaller than the aperture diameter. It is preferable to that.

  Further, an example will be described in which an I / V conversion unit 4 including a “two-channel I / V conversion unit (two-channel I / V conversion element)” that operates with a common gain set for both channels is provided. However, although the two channels can be operated with different gains set, but the adjustment values cannot be made significantly different, a “two-channel I / V conversion unit (two-channel I / V conversion element)”, , It is difficult to reduce the influence of the difference in the amount of incident light of “measurement light” on the “photoelectric conversion unit” by adjusting the gain during the I / V conversion processing. / V conversion element), the “first opening area (the opening diameter in the case of a round hole)” of the “first light passage hole” in the “first incident amount limiting section”, And "Second incident amount limiting unit" In the case where the “second opening area (opening diameter in the case of a round hole)” of the “second light passage hole” is the same, the above-described problem occurs. Also in the configuration employing the “I / V conversion unit (two-channel I / V conversion element)”, the “first photoelectric conversion unit” is different from the “first opening area” and the “second opening area”. It is preferable that the incident amount of the “measured light” into the “second photoelectric conversion unit” and the incident amount of the “measured light” into the “second photoelectric conversion unit” be approximately equal.

  Further, in a configuration in which a separate “I / V conversion unit” is provided for each of the “first light receiving sensor” and the “second light receiving sensor”, if the gain adjustment values of the two “I / V conversion units” are greatly different from each other. If it is not possible, the above-described problem occurs, so that the “light to be measured” to the “first photoelectric conversion unit” is changed by changing the “first opening area” and the “second opening area”. It is preferable that the amount of incident light and the amount of incident light to be measured into the “second photoelectric conversion unit” be approximately the same.

  Also, if the opening area of the “first light passage hole” provided in the “first incident amount limiting portion” and the opening area of the “second light passage hole” provided in the “second incident amount limiting portion” are different. Although the configuration in which the amounts of light to be measured L incident on the photoelectric conversion units 23a and 23b are substantially the same has been described above as an example, instead of such a configuration (or in addition to such a configuration), By adding a “light reduction filter” to at least one of the “first light receiving sensor” and the “second light receiving sensor”, the incident amount of the “measured light” to the “first photoelectric conversion unit” and the “ It is also possible to adopt a configuration in which the incident amounts of the “measured light” to the “two photoelectric conversion units” are substantially the same (not shown).

  In addition, a configuration in which three types of measured light L of red light, green light, and blue light are used as “measured light” to measure “optical parameters” such as a wavelength and a radiation amount has been described as an example. The number of types of “lights to be measured” (“the number of wavelength ranges to be measured”) that can be measured in parallel by one “light measuring device” is not limited to “3” and two types of “lights to be measured” (Two “wavelength ranges to be measured”) can be measured in parallel, or four or more types of “light to be measured” (four or more “wavelength ranges to be measured”) can be measured in parallel. Can also be adopted. Further, a configuration in which one kind of “measurement light” (one “measurement target wavelength range”) that can be measured in parallel by one “light measurement device” can be adopted. Furthermore, it is also possible to configure so that “light measurement amount” can be measured as “optical parameter” instead of “radiation amount”.

1, 1A to 1C Light measuring device 2 Diffusion optical system 3R, 3G, 3B, 3a to 3c Light receiving unit 4, 4r, 4g, 4b I / V conversion unit 5, 5r, 5g, 5b A / D conversion unit 8 Processing unit Reference Signs List 9 storage unit 11 entrance unit 12 entrance holes 13r, 13g, 13b exit units 14ra, 14rb, 14ga, 14gb, 14ba, 14bb exit holes 20a, 20b light receiving sensors 21r, 21g, 21b, 22a, 22b optical filters 23a, 23b photoelectric conversion Unit 30 Incident amount limiting unit 31a, 31b Light passage hole Da, Db Detection signal data Hr, Hg, Hb Wavelength range L Measurement light Sia, Sib, Sva, Svb Detection signal

Claims (3)

A first light receiving sensor having a first photoelectric conversion unit for outputting a first detection signal according to an incident amount of the measured light, and a second detecting signal according to an incident amount of the measured light; A second light receiving sensor having a second photoelectric conversion unit is provided, and the spectral sensitivity of the first light receiving sensor in the wavelength range to be measured and the spectral sensitivity of the second light receiving sensor in the wavelength range to be measured are determined. A light receiving unit configured so that the ratio of the measured light of each wavelength within the wavelength range to be measured is different,
A first incident-amount limiting unit that has a first light-passing hole through which the measured light can pass and that limits an incident amount of the measured light to the first photoelectric conversion unit; and the measured light A second light-passing hole capable of passing through, a second incident-amount limiting unit that limits an incident amount of the measured light to the second photoelectric conversion unit;
Based on the first detection signal, first data capable of specifying the signal level of the first detection signal is generated, and the signal level of the second detection signal is determined based on the second detection signal. A data generation unit for generating identifiable second data;
Based on the signal level of the first detection signal specified based on the first data, and the signal level of the second detection signal specified based on the second data, the measurement of the light to be measured is performed in advance. A processing unit for calculating the specified optical parameter,
The first incident amount limiting unit and the second incident amount limiting unit are configured to determine an incident amount of the measured light of each wavelength within the wavelength range to be measured with respect to the first photoelectric conversion unit and the second photoelectric conversion unit. The first opening area of the first light passage hole and the second opening area of the second light passage hole are set such that the difference between the amount of light incident on the converter and the light amount falls within a predetermined light amount range. A light measuring device that is different. A diffusion optical system for equalizing the incident direction of the measured light and the incident amount of the measured light with respect to the first light receiving sensor and the second light receiving sensor;
The first incident amount limiting unit is provided in a first emission unit that emits the measured light to the first light receiving sensor in the diffusion optical system,
The optical measurement device according to claim 1, wherein the second incident amount limiting unit is provided in a second emission unit that emits the measured light to the second light receiving sensor in the diffusion optical system.   The processing unit specifies the predetermined optical parameter of the measured light based on the signal level of the first detection signal specified based on the first data and the second data. Calculating the wavelength of the measured light based on the ratio of one of the signal levels of the second detection signal to the other, and calculating the wavelength of the measured light based on the calculated wavelength and the one of the calculated wavelengths. The optical measurement device according to claim 1, wherein the radiation amount is calculated.

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