JPH0827215B2 - Spectrometer - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectroscopic measurement device capable of calculating a product sum of a weighting coefficient for each wavelength arbitrarily set by a user and a spectroscopic measurement value. In addition to color measurement, it is particularly suitable for applications such as photographic color density measurement and printing color density measurement.

(Prior Art) Conventionally, a spectroscopic measurement device has been widely used, which is configured to disperse light from a sample into light of each wavelength and measure the light intensity of each dispersed wavelength. In such a spectroscopic measurement device, when evaluating the measured color, the spectroscopic measurement is performed by calculating the sum of products of the color matching functions _{λ 1} , _λ , _λ of the CIE standard color system and the spectroscopic measurement values. The values are converted into tristimulus values.

(Problems to be Solved by the Invention) As described above, when performing color evaluation using spectroscopic measurement values, the spectroscopic measurement values and the color matching function _{λ 1} of the CIE standard color system,
The product sum of _{λ 1} and _{λ 2} is calculated. For example, when measuring the color density of a color photograph, another spectral sensitivity different from the above color matching function is used. In addition, each industry and each user may want to evaluate the color with their own spectral sensitivity. In such a case, if the user can set an arbitrary user spectral sensitivity and can perform color evaluation with the set spectral sensitivity,
Considered convenient.

The present invention has been made on the basis of such knowledge, and an object of the present invention is to provide a spectroscopic measurement device capable of evaluating a color with arbitrary spectral sensitivity set by a user.

(Means for Solving Problems) In the spectroscopic measurement device according to the present invention, in order to solve the above problems, as shown in FIG. 1, an arbitrary coefficient US1 (1 ), US1 (2), ..., US1 (i), .. Coefficient setting means (US), and an addition value of the product of the spectroscopic measurement value R (i) and the coefficient set US1 (i) ΣUS1
(I). R (i) and a product-sum calculation means (ΣM).

Further, in the merged invention, the sample (1) is illuminated by the illumination light source (2), and in the spectroscopic measurement device for measuring either the spectral reflectance or the spectral transmission of the sample (1), it is optional for each wavelength. Coefficients US1 (1), US1 (2), ..., US1 (i), ...
Coefficient setting means (US) for setting and spectroscopic measurement value R (i)
And the addition value ΣP (i) · U of the product for each wavelength of the spectral distribution P (i) of the light source used for the upper color evaluation calculation and the coefficient set US1 (i)
And a product-sum calculation means (ΣM) for calculating S1 (i) · R (i).

If necessary, the coefficient setting means (US)
The third coefficient sets US2 (i) and US3 (i) may be set, and the product-sum calculation means (ΣM) may also be configured to be able to calculate the product sum for these coefficient sets.

(Operation) In the present invention, the coefficient setting means (US) allows the user to set an arbitrary weighting coefficient US1 (i) for each wavelength. User spectral sensitivity can be defined. In the product-sum calculation means (ΣM), the spectroscopic measurement value R (i) and the coefficient set US1
Addition value of product for each wavelength with (i) ΣUS1 (i) · R (i)
Is calculated. The product sum calculated by the product sum calculation means (ΣM) is a value obtained by evaluating the spectroscopic measurement value R (i) with the user spectral sensitivity. The present invention can be used not only for evaluating the object color but also for evaluating the light source color.

Next, the merged invention is used when measuring the object color of the sample (1) under an arbitrary illumination light source (2), and in the product-sum calculation means (ΣM), the spectroscopic measurement value R
When calculating the added value of the product of (i) and the coefficient set US1 (i) for each wavelength, the spectral distribution P of the light source used for the color evaluation calculation
(I) is also multiplied for each wavelength. Therefore, the sum of products calculated by the sum of products calculation means (ΣM) is evaluated by the user spectral sensitivity of the reflection color or the transmission color of the sample (1) in consideration of the spectral distribution of the light source used for the color evaluation calculation. It becomes a value.

(Examples) Hereinafter, preferred examples of the present invention will be described with reference to the drawings. FIG. 2 is a block diagram of an embodiment of the present invention.
In FIG. 2, S1 and S2 are spectroscopic sensors that split incident light into light of each wavelength and output in parallel a photocurrent proportional to the light intensity of each wavelength. Silicon photodiode array PDA1, PD
It is composed of A2. Each of PDA1 and PDA2 is a silicon photodiode array in which 40 silicon photodiodes are linearly arranged. Bandpass filter arrays F1 and F2 are arranged in the optical path of the silicon photodiode arrays PDA1 and PDA2, respectively. The bandpass filter arrays F1 and F2 are arranged by arranging a large number of optical bandpass filters having different transmission wavelengths so that the transmission wavelength thereof continuously changes from the short wavelength side to the long wavelength side. By inputting light to the silicon photodiode arrays PDA1 and PDA2 through the bandpass filter arrays F1 and F2, the wavelength of light detected by each photodiode in the photodiode array continuously changes from short wavelength to long wavelength. It is supposed to do.

Pulse xenon lamp (2) by lighting circuit (3)
Part of the light emitted from the device is incident on the light source measuring spectral sensor S2 in order to measure the variation in the spectral energy distribution of the light source, and the remaining part illuminates the measurement sample (1). The reflected light from the measurement sample (1) is incident on the sample measurement spectroscopic sensor S1. The photocurrent proportional to the energy of each wavelength of light incident on the sensors S1 and S2 is
Output from each silicon photodiode of the sensors S1 and S2. The photocurrent from each silicon photodiode of PDA1 and PDA2 is input to the photometric circuit section (4), integrated and A / D converted for each silicon photodiode, and the value is input / output port (5). , Is input to the control / arithmetic unit (6). The lighting circuit (3) is controlled by the control / arithmetic unit (6) via the input / output port (5). Detailed configurations and operations of the photometric circuit section (4) and the illumination circuit (3) will be described later.

The control / calculation unit (6) is a central processing unit (CPU) that controls and calculates the entire system. The control / arithmetic unit (6) stores a program storage unit (7), which is a read-only memory (ROM) storing a program executed by the control / arithmetic unit (6), and arithmetic data, system status, and the like. A data storage unit (8) that is a random access memory (RAM) and a spectroscopic sensor data storage unit that is an electrically erasable programmable read-only memory (EEPROM) that stores the detection wavelengths of the spectroscopic sensors S1 and S2 and various correction constants. Controls an external input / output port (10) for inputting / outputting data between the external device such as a personal computer (9) and a magnetic storage device (12) such as a floppy disk device or a hard disk device. A magnetic storage device control unit (11), a display control unit (13) that controls a display unit (14) made of liquid crystal or CRT, and a keyboard (1
5), the printer (16) and the real time clock (17) that keeps track of the current time are connected.
It is controlled by the arithmetic unit (6).

FIGS. 3, 4, and 5 are circuit diagrams of the photometric circuit unit (4), and FIGS. 6 and 8 are photometric timing charts.
FIG. 9 is a flowchart of the photometric control program.
First, Fig. 3 shows the silicon photodiode array PDA1, P
The current-voltage conversion circuit and the integration circuit connected to any one silicon photodiode PDi in DA2 are shown. The circuit of FIG. 3 is connected to all the silicon photodiodes of the silicon photodiode arrays PDA1 and PDA2. In FIG. 3, OP1i is an operational amplifier, and a feedback resistor Rfi is connected between the inverting input terminal and the output terminal. The non-inverting input of the operational amplifier OP1i is connected to the ground. The anode of the silicon photodiode PDi is connected to the inverting input terminal of the operational amplifier OP1i, and the cathode of PDi is connected to the ground. The output terminal of the operational amplifier OP1i is the integrating resistor Rc.
i is connected once, and the other end of the integrating resistor Pci is connected to the input terminal of the analog switch SW1i. The output terminal of the analog switch SW1i is connected to the inverting input terminal of the operational amplifier OP2i. The control terminal of the analog switch SW1i is connected to an integration control signal CHG described later. An integration capacitor Cci and an integration reset analog switch SW2i are connected in parallel between the inverting input terminal and the output terminal of the operational amplifier OP2i. The control signal of the analog switch SW2i is the signal RES described later.
It is connected to the. The calculation inverting input terminal of the amplifier OP2i is connected to an input of the discharge analog switches SW4i, the output of the analog switch SW4i is connected to one end of the discharge resistor R _D i, the other end of the resistor R _D i is, -5V It is connected to the. For convenience, the control signal of analog switch SW4i is set to ADi
I will name it. The non-inverting input of the operational amplifier OP2i is connected to ground, and the output terminal is the analog switch SW.
It is connected to the input terminal of 3i. Analog switch SW3i
The output terminal of is named Oi for convenience. Control signal of analog switch SW3i is analog switch
It is connected to the ADi signal which is the control signal of SW4i. For convenience, the above circuits are collectively referred to as AN (i).

FIG. 6 is a timing chart explaining the operation of the circuit of FIG. The operation of the circuit of FIG. 3 will be described below with reference to the timing chart of FIG. At time t1
The RES signal goes low, the CHG signal goes high, and analog switch SW2i turns off and analog switch SW1i turns on. At the same time, or after a short delay, the lighting circuit (3) causes the pulse xenon lamp (2) to emit light.
The light passes through the bandpass filter array F1 or F2 and enters the silicon photodiode PDi. When light is incident on the silicon photodiode PDi, a photocurrent I1i proportional to the intensity of the incident light flows from the anode of PDi to the inverting input terminal of the operational amplifier OP1i, and almost all of it flows to the feedback resistor Rfi. The output voltage V1i of the operational amplifier OP1i is expressed by the following equation.

V1i = −I1i · Rfi ... Currently, since the analog switch SW1i is ON and SW2i is OFF, the current I2i of the following formula flows from the output terminal of the operational amplifier OP1i to the integration capacitor Cci through the integration resistor Rci.

The output voltage V2i of the integrating operational amplifier OP2i is obtained by time-integrating I2i as shown in the following expression.

Therefore, V2i becomes a voltage proportional to the time integral value of the intensity of light incident on the silicon photodiode PDi. CH at time t2 after the pulse xenon lamp (2) has finished emitting light
The G signal goes low and the analog switch SW1i turns off. At this point, the output voltage V2i of the integrating operational amplifier OP2i is held. After that, at time t3, the ADi signal becomes High, and the analog switches SW4i and SW3i are turned ON. The charge stored in the integrating capacitor Cci is the analog switch S
It is discharged to −5V through W4i and discharge resistor R _D i with constant current I3i expressed by the following formula.

Therefore, the output voltage V2i of the integrating operational amplifier OP2i decreases linearly. The operation of the signal Oi and the operation at the time thereafter will be described later.

FIG. 4 shows one block (k-th block) in the photometric circuit.
It is a circuit diagram showing. Silicon photodiode array
The total of 80 silicon photodiodes in PDA1 and PDA2 are divided into 8 blocks by 10 blocks. In this embodiment, 1
Divide the silicon photodiodes contained in one block into 10 consecutive silicon photodiodes. As shown in FIG. 4, the anodes of the 10 silicon photodiodes PDj to PDj ₊₉ (j = k × 10) in the k-th block (k = 0, 1, ..., 7) are the same as the above currents. Voltage conversion / integration circuit AN (j) ~
Connected to AN (j + 9). The cathodes of silicon photodiodes are all connected to ground. Analog switch SW3j in circuits AN (j) to AN (j + 9)
The outputs Oj to Oj ₊₉ of SW3j ₊₉ are all connected to the non-inverting input of the comparator CMPk. The non-inverting input of comparator CMPk is connected to + 5V through resistor R1k. Inverting input of the comparator CMPk is connected to the negative reference voltage -V _B. The output of the comparator CMPk is Ck. ADj ~ ADj
₊₉ is a control signal of the analog switches SW4j to SW4j ₊₉ and SW3j to SW3j _{+9 in} the circuits AN (j) to AN (j + 9), respectively. For convenience, block the circuit block of Fig. 4
(K) Name it as (k = 0,1,2, ..., 7).

FIG. 5 is a circuit diagram of the entire photometric circuit of this embodiment. F
1 and F2 are the bandpass filter array, PDA1, P2
DA2 is the silicon photodiode array. PDA
The silicon photodiodes in 1 and PDA2 are 4 blocks of 10 each, that is, PDA1 and PDA2 are 8 in total.
It is divided into blocks and each is connected to the circuit blocks BLOCK (0) to BLOCK (7) described in FIG. The cathodes of all silicon photodiodes are connected to ground.

IC1 is a 4-input, 16-output decoder. IC1's When high, all outputs from Q _{0 to} Q ₁₅ are low.

Is low, one of the outputs Q _{0 to} Q ₁₅ becomes high and the other becomes low in response to the 4-bit signal input to the A, B, C, D input terminals. In this embodiment, Q _{10 to} Q ₁₅ are not used, so they are not shown in the circuit diagram.

Table 1 shows the relationship between Q _{0 and} Q ₉ and.

To realize this function, for example, CMOS-IC
There is 4514.

Output Q ₀ of IC1 is AD ₀ , AD ₁₀ , AD ₂₀ , AD ₃₀ , AD ₄₀ , AD ₅₀ , A
Connected to D ₆₀ , AD ₇₀ , output Q ₁ is AD ₁ , AD ₁₁ , AD ₂₁ , AD ₃₁ , A
Connected to D ₄₁ , AD ₅₁ , AD ₆₁ , AD ₇₁ and output Q ₂ is AD ₂ , AD ₁₂ , A
D ₂₂ , AD ₃₂ , AD ₄₂ , AD ₅₂ , AD ₆₂ , AD ₇₂ are connected, and output Q ₃ is
Connected with AD ₃ ,, AD ₁₃ ,, AD ₂₃ , AD ₃₃ , AD ₄₃ , AD ₅₃ , AD ₆₃ , AD ₇₃ ,
Output Q ₄ is connected to AD ₄ , AD ₁₄ , AD ₂₄ , AD ₃₄ , AD ₄₄ , AD ₅₄ , AD ₆₄ , AD _74, and output Q ₅ is AD ₅ , AD ₁₅ , AD ₂₅ , AD ₃₅ , AD ₄₅ , AD ₅₅ , A
Connected to D ₆₅ , AD ₇₅ , output Q ₆ is AD ₆ ,, AD ₁₆ ,, AD ₂₆ , AD ₃₆ , A
Connected to D ₄₆ , AD ₅₆ , AD ₆₆ , AD ₇₆ , output Q ₇ is AD ₇ ,, AD ₁₇ ,, A
Is connected to the _{D 27, AD 37, AD 47} , AD 57, AD 67, AD 77, the output Q ₈ is
Connected with AD ₈ , AD ₁₈ , AD ₂₈ , AD ₃₈ , AD ₄₈ , AD ₅₈ , AD ₆₈ , AD ₇₈
The output Q ₉ is connected to AD ₉ , AD ₁₉ , AD ₂₉ , AD ₃₉ , AD ₄₉ , AD ₅₉ , AD ₆₉ , AD ₇₉ .

In addition, all circuit blocks BLOCK (0) to BLOCK
The comparator outputs C0 to C7 in (7) are input to IC2 which is an 8-input NOR. In addition, each comparator output C0,
C1, C2, C3, C4, C5, C6, C7 are connected to one input of IC4, IC5, IC6, IC7, IC8, IC9, IC10, IC11 which are 2-input AND gates respectively, and IC4, IC5, IC6 The other inputs of IC7, IC8, IC9, IC10, and IC11 are all connected to the output of the 2-input NOR gate IC3. IC12, IC13, IC14, IC15, IC16, IC17, IC18, I
C19 is a 16-bit counter, and the count value is cleared to 0 at the rising edge of the CLR input, and the count value is incremented by 1 at the rising edge of the CK input. OSC
Is an oscillator for outputting a reference clock for A / D conversion. The output of the OSC is connected to one input of the 2-input NOR gate IC3. The input / output port (5) was described in the description of FIG. 2, and the signals RES and CHG described later in the description of FIG. 3 are the outputs of the input / output port (5). Decoder IC1 The input is the output of the input / output port (5). The output of the 8-input NOR gate IC2 is input to the ADE input of the input / output port (5). CLR output of I / O port (5) is counter IC1
It is connected to the CLR input of 2, IC13, IC14, IC15, IC16, IC17, IC18, IC19. I / O port (5) The output is connected to one input of a 2-input NOR gate IC3. The other input of the 2-input NOR gate IC3 has an oscillator
OSC output is input, so 2-input NOR gate IC3
The output of When the signal is Low, the inverted signal of the output of the oscillator OSC is output, It is always Low when the signal is High. Counter IC12, IC1
3, IC14, IC15, IC16, IC17, IC18, IC19 output CT0, CT1, CT2, C
T3, CT4, CT5, CT6, CT7 are input to the input / output port (5).

FIG. 7 is a block diagram for explaining the illumination circuit (3). The numbers (2), (3) and (5) in FIG. 7 correspond to those in FIG. (35) is a power supply for the lighting circuit, which is a low voltage DC power supply of about 9V. Reference numeral (31) is a booster circuit utilizing blocking oscillation, which supplies power for charging a main capacitor (37) for accumulating electric charge for pulse xenon lamp light emission. Reference numeral (32) is a voltage control circuit that detects the charging voltage of the main capacitor (37) and when the charging voltage becomes higher than a predetermined maximum voltage, sets the FCHG1 output to the low level to turn on the main capacitor (3
When the charging voltage of 7) becomes lower than a predetermined minimum voltage lower than the maximum voltage, the FCHG1 output is set to a high level, and when the charging voltage is between the maximum voltage and the minimum voltage, the FCHG1 output is not It is a voltage detection circuit with hysteresis that keeps the state up to that point.

The booster circuit (31) is connected to the voltage control circuit (32).
FCHG1 signal and boost control signal F from I / O port (5)
Enter CHG2. The FCHG2 signal is an output from the input / output port (5) and is a signal for the CPU (6) to control the power supply from the booster circuit (31) via the input / output port (5). The booster circuit (31) receives the FCHG1 signal and FCH.
Input the G2 signal and supply power only when both signals are at high level. (36) is a diode for preventing current from flowing backward from the main capacitor (37) to the booster circuit (31). Therefore, FC from the I / O port (5)
While the HG2 output is High level, the output FCHG1 from the voltage control circuit (32) controls the booster circuit (31) so that the charging voltage of the main capacitor (37) is between the highest level and the lowest level. Controlled by. (33) compares the charging voltage of the main capacitor (37) with a predetermined charging completion voltage equal to or lower than the minimum voltage,
When the charging voltage is higher, the VCHK output signal is set to High, and when the charging voltage is lower, the VCHK output signal is set to Low.
To However, the maximum voltage, the minimum voltage, and the charging completion voltage are set higher than the voltage at which the pulse xenon lamp (2) can emit light. From the voltage detection circuit (33)
The VCHK signal is input to the I / O port (5) and the CPU
By inputting the VCHK signal through the input / output port (5), (6) determines whether the lighting circuit (3) is ready to emit light. (34) is a light emission trigger circuit for causing the pulse xenon lamp (2) to emit light,
The pulse xenon lamp (2) is caused to emit light at the rising edge of the FLASH signal from the input / output port (5). CPU
(6) controls the FLASH signal via the input / output port (5) to control the light emission timing of the illumination circuit (3).

FIG. 8 is a timing chart showing the photometric timing of this embodiment, and FIGS. 9 (a), (b), (c), and (d) show CP.
It is a flow chart which shows control of photometry circuit part (4) by U (6), and the procedure of calculation for calculating a measurement value. The photometric operation will be described below with reference to the timing chart of FIG. 8 and the flowchart of FIG. # 1 in FIG. 9 (a)
, The CPU (6) inputs the charging completion signal VCHK from the lighting circuit (3) through the input / output port (5), and VCHK
It is determined whether or not the lighting circuit (3) can emit light by determining whether or not it is at the high level. If VCHK is Low, light emission preparation is not completed, so proceed to # 2, set error flag ERRF to 1, and return. If VCHK is High, light emission is possible, so proceed to # 3 and set boost control signal FCHG2 to Low. When FCHG2 becomes Low, the booster circuit (31) stops the power supply, but it takes about 100 microseconds to completely stop the power supply. The reason why the power supply to the step-up circuit (31) is stopped before the photometry is that the step-up circuit (31) oscillates at a high voltage while the power is supplied, which is harmful to the photometry circuit section (4). This is because it becomes a noise source. Next, the CPU (6) proceeds to # 5 and R
The ES signal goes low and the CHG signal goes high to start the integration operation. Immediately after that, in step # 6, the FLASH signal goes high.
Then, the pulse xenon lamp (2) is caused to emit light. As described above, part of the light emitted from the pulse xenon lamp (2) is incident on the light source measurement spectroscopic sensor S2, and the remaining part is irradiated to the measurement sample (1), and the light is emitted from the measurement sample (1). Is reflected by the sample measurement spectroscopic sensor S1.
The light incident on the spectroscopic sensors S1 and S2 is dispersed by the bandpass filter arrays F1 and F2, respectively, and is incident on the silicon photodiode arrays PDA1 and PDA2.
Each of the silicon photodiodes in the section outputs a photocurrent proportional to the dispersed light intensity. The photocurrent from each silicon photodiode is current-voltage converted according to the formula and integrated according to the formula, as described in the description of the timing chart of FIG. Therefore, the output voltages V2 _{0 to} V2 ₇₉ of the integrating circuit increase in the positive direction as shown in FIG. The CPU (6) waits until the light emission ends in step # 7 (3 msec in this embodiment),
In step # 8, the CHG signal is set to Low to end the integration operation. In this state, the integrated output voltages V2 _{0 to} V2 ₇₉ hold a voltage proportional to the time integral value of the intensity of light incident on each silicon photodiode. At this time, the FLASH signal is also low
Return to level and prepare for the next flash.

Next, the CPU (6) proceeds to # 9 where the variable N is set to 0. The variable N is A, B, C, D of the decoder IC1 in FIG.
It is a value that is output to the input through the input / output port (5), and when the variable N is represented by a binary number, the 0th bit is A, 1
The second bit corresponds to B, the second bit corresponds to C, and the third bit corresponds to D. Next, at # 10, set the CLR output of the input / output port (5) to H
igh, counter IC12, IC13, IC14, IC15, IC16, IC17, IC1
8, Clear the count value of IC19 to 0. Next, at # 11, the value 0 of the variable N is output from the input / output port (6) to the A, B, C, D terminals of IC1. Next, return the CLR signal to Low in step # 12, Set the signal to Low. Now, since the A, B, C, D inputs are all Low, as shown in Table 1, the Q ₀ signal becomes High and ADi (i
= 0,10,20,30,40,50,60,70) becomes High and analog switches SW3i, SW4i (i = 0,10,20, ..., 60,70) become conductive . Therefore, as described above, the integrated output voltage V2
i (i = 0,10,20, ..., 60,70) decreases linearly. At this time, comparator CMP0, CMP1, CMP2, CMP3, CMP
The non-inverting inputs of 4, CMP5, CMP6, CMP7 are analog switches SW3 ₀ , SW3 ₁₀ , SW3 ₂₀ , SW3 ₃₀ , SW3 ₄₀ , SW3 ₅₀ , SW3 ₆₀ , SW3
Through ₇₀ , V2 ₀ , V2 ₁₀ , V2 ₂₀ , V2 ₃₀ , V2 ₄₀ , V2 ₅₀ , V2 ₆₀ , V2 ₇₀
It is connected to the. Now, it will be described with attention to the voltage of V2 _0, V2 ₀ comparator C via the analog switch SW3 ₀
Connected to the non-inverting input of MP0. As mentioned above, V2 ₀
The output of is going to decrease linearly, when towards V2 ₀ than the reference voltage -V _B of the inverting input terminal of the comparator CMP ₀ is high, the output C0 of the comparator CMP0 is High. The C0 signal is connected to one input of the 2-input AND gate IC4, and the output of the oscillator OSC is connected to the other input of IC4. Since the NOR with the signal is input, the signal represented by the logical expression is input to the clock input terminal CK0 of the counter IC12.

Therefore, the comparator output C0 is High at the clock input CK0 of the counter IC12. The clock pulse signal is input only when the signal is low. # 12 in Since the signal has become Low and the comparator output C0 is currently High, the counter IC12 is counting clock pulses. V2 ₀ voltage with time went linearly decreases becomes lower than the reference voltage -V _B, the comparator output C0 is switched to Low from High. When C0 becomes Low, the clock pulse signal is not input to the clock input CK0 according to the formula, and the counter IC12 stops counting.

Therefore, the count value CT0 of the counter IC12 is It becomes a value proportional to the time from when the signal becomes Low until C0 becomes Low, that is, a value proportional to the voltage value of (V2 ₀ + V _B ). In this way, the integrated value of the photocurrent of the silicon photodiode PD0 is A / D converted. The voltages of V2 ₁₀ , V2 ₂₀ , V2 ₃₀ , V2 ₄₀ , V2 ₅₀ , V2 ₆₀ , V2 ₇₀ are also A / D converted in the same manner as above, and the counter IC13, IC14, IC15,
The count value CTk of IC16, IC17, IC18, IC19 is a value represented by the following formula.

CTk = C ₁ (V2j + V _B ) (where C ₁ is a proportional constant) k = 0,1,2, ..., 7 j = k × 10 As described above, the outputs C0 to CMP0 to CMP7 of all comparators CMP0 to CMP7 C7 is connected to one input of each 8-input NOR gate IC2, and the output ADE of IC2 is the comparator output.
High only when C0 to C7 are all Low, otherwise Low. Comparator outputs C0 to C7 are all Low
Means that V2 ₀ , V2 ₁₀ , V2 ₂₀ , V2 ₃₀ , V2 ₄₀ , V2 ₅₀ , V
This means that all the A / D conversion for 2 ₆₀ and V2 ₇₀ has been completed.

The CPU (6) inputs the ADE signal from the input / output port (5) in step # 13 and checks whether it is High or not. if
If the ADE signal is not High, repeat the input and check of the ADE signal until it becomes High. If the ADE signal goes high, # 14
Proceed to Set the signal to High.

When the signal becomes High, all the outputs Q _{0 to} Q ₉ of the decoder IC1 become Low, and the analog switches SW4i, SW3i (i = 0,10,2
0,30,40,50,60,70) is turned off and the integrated output V2i (i = 0,
The voltage of 10,20,30,40,50,60,70) stops decreasing linearly and is kept at the current voltage. Also the comparator
The non-inverting input of CMPk (k = 0,1,2, ..., 7) becomes High by the pull-up resistor R1k, and the comparator output Ck becomes H
igh, but Since the signal is High, the counts by the counters IC12 to IC19 are not performed according to the formula, and the count value at that time is held.

Next, the CPU (6) at # 15 passes the input / output port (5) through the count values CT0, CT1, CT2, ..., C of the counters IC12 to IC19.
Input T7 and array variables CM1 (N) and CM1 (N + 1) respectively.
0), CM1 (N + 20), ..., CM1 (N + 70). Currently N is 0, so CM1 (0), CM1 (10), CM1 (2
0), ..., CM1 (70), that is, the A / D converted value of V2i is stored in CM1 (i) (i = 0, 10, 20, ..., 70). Next, in # 16, N is incremented by 1, and whether N is 10 or not is determined. If it is not 10, the process returns to # 10. If you execute from # 10 to # 15, this time N
= 1, so the integrated output V2 ₁ , V2 ₁₁ ,, V2 ₂₁ ,, V2 ₃₁ ,, V2 ₄₁ , V
2 ₅₁ , V2 ₆₁ , V2 ₇₁ are A / D converted and array variables CM1 (1), CM1
(11), CM1 (21), CM1 (31), CM1 (41), CM1 (51), CM1
(61), CM1 (71). If N16 is incremented by 1 in # 16 and then # 10 to # 17 are repeated until N becomes 10, all integrated outputs V2i are A / D converted and stored in CM1 (i). V2i and CM1 The relationship of (i) can be expressed by an equation.

CM1 (i) = C ₁ (V2i + V _B ) ... If it is determined that N has become 10 in # 17, it means that A / D conversion of all integrated outputs is completed.
ES is set to High and the integration capacitor Cci (i = 0,1,2, ...
., 79) Analog switch SW2i connected in parallel
Is turned on, and the charge of the integration capacitor Cci is set to 0. Furthermore, 0 is output to A, B, C, and D here, and it returns to the initial state.

Next, proceeding to # 19 in FIG. 9B, the measurement of dark offset is started. The measurement of the dark offset is the measurement with the above-mentioned pulse xenon lamp (2) emitted.
It is almost the same as 5 to # 18, but the pulse xenon lamp (2) is not made to emit light, and the boost control signal FCHG2 is set to High at the step of # 31 after the measurement is completed, and the boost circuit (3
The only difference is that the power supply from 1) is restarted, so the timing chart is omitted. # 19 ~ #
At 21, the integrated output V2i (i = 0,1,2, ..., 79) is obtained when the pulse xenon lamp (2) is not lit.
The integrated outputs are all A / D converted in steps # 31 to # 31 and stored in the array variable OF (i). This value of OF (i) is a value including all the effects of the offset of the operational amplifier and the external light, the dark current of the silicon photodiode, the leakage current of the analog switch, and the like, and the pulse xenon lamp (2 ) Is subtracted from CM1 (i), which is the measured value after illuminating), the error due to the offset, dark current of silicon photodiode, leakage current of analog switch, influence of external light, etc. is canceled. can do. Further, since the pulse xenon lamp (2) is used as the light source in this embodiment, it is possible to measure the dark offset without chopping the light as in the case where the constant light is used as the light source. It has the advantage of not requiring a drive part. Fig. 9 (c)
In # 32 to # 35, the dark offset is corrected. That is, the value obtained by subtracting the dark offset measurement value OF (i) from the measurement value CM1 (i) obtained by illuminating the pulse xenon lamp (2) is CM1 (i).
Store in (i).

Calculation of spectral sensitivity correction is performed from # 36. Here, the meaning and principle of the spectral sensitivity correction will be described. FIG. 10 (a) shows the photocurrent I1i of each silicon photodiode in the spectroscopic sensor S1 used in this embodiment and the current-voltage conversion / integration circuit AN (i) (i = 0, 1, 2, ... , 39) Spectral sensitivity Si as a photometric circuit system multiplied by the amplification factor
(Λ) (i = 0, 1, 2, ..., 39). Where λ
Is the wavelength of light. The band-pass filter arrays F1 and F2 of the spectroscopic sensors S1 and S2 have been subjected to infrared cut and ultraviolet cut processing. The value of is almost zero. S0 (λ) to S39 (λ) are arranged at a pitch of approximately 10 nm, and the half-width of the bandpass is wider than 10 nm. In addition, due to the influence of internal reflection between the bandpass filter array and the photodiode array, it has sensitivity in a wavelength region that is considerably away from the peak wavelength, and this will be referred to as the tail of the spectral sensitivity. Due to the tail of the spectral sensitivity and the wide half width, an error occurs in the measured value. The calculation of the spectral sensitivity correction is to obtain a correct measured value from the output of the sensor having the spectral sensitivity having a wide half width as described above.

Now, let the peak wavelength of the spectral sensitivity Si (λ) (i = 0,1,2, ..., 39) be PKi (i = 0,1,2, ..., 39). Then, the measurement wavelength range (370 to 720 nm in this embodiment) 40 areas Δλi (i = 0,1,2, ...
・, 39). Now, the spectral distribution of the light incident on the spectral sensor S1 is approximated to be flat within one wavelength region divided into 40 as shown in FIG. 10 (b), and the light intensity in the wavelength region Δλi is calculated. Let's call it Pi. At this time, Si (λ)
The output of one sensor with spectral sensitivity of Oi ((i = 0,
1,2, ..., 39), Oi is expressed by the following equation.

now, Is defined as follows.

With this definition, the equation can be expressed as

Since the above equation holds for i = 0 to 39, the following equation holds using a matrix.

The above equation is expressed as follows.

However, From the formula, here, Is the inverse matrix of. Therefore, , The output of the spectroscopic sensor S1 From the value of, the spectral energy distribution of the incident light You can know.

To obtain, first measure the spectral sensitivities S0 (λ) to S39 (λ) of the spectroscopic sensor using a spectroscope, and according to the formula, Should be calculated.

The sample measurement spectroscopic sensor S1 has been described above for convenience, but the same applies to the light source measurement spectroscopic sensor S2. Here, the spectral energy distribution of the incident light is set to the wavelength region Δ
It was approximated as being flat in λi,
This embodiment is for measuring the spectral reflectance of a reflective object, and the spectral reflectance of a reflective object such as paint or printed matter generally draws a gentle curve, and there are many things without sharp absorption. Can be approximated as follows.

Here, description will be given again according to the flowchart of FIG. In the formula for the spectroscopic sensor for sample measurement (sensor for sample) S1 To And in the formula for the light source measurement spectroscopic sensor (reference sensor) S2 And In # 36 to # 39, the spectral sensitivity correction calculation shown in the equation is performed for the sample measuring spectral sensor S1. From # 40 to # 43, spectroscopic sensor S2 for light source measurement
The spectral sensitivity correction calculation shown in the equation is performed.
The formula is as follows for the spectroscopic sensor S1.

Now, the output Oi of the spectroscopic sensor S1 (i = 0,1,2, ..., 3
9) is stored in CM1 (i), and if Pi calculated by the formula is stored in CM2 (i), Becomes The formula is as follows for the spectroscopic sensor S2.

Now, the output of the spectroscopic sensor S2 is CM1 (i + 40) (i = 0,
1,2, ..., 39), and if Pi calculated by the formula is stored in CM2 (i + 40), Becomes The values of Bij and B'ij are stored in advance in the spectroscopic sensor data storage section (9).

Next, in # 44 of FIG. 9 (d), the light source correction is calculated. The illumination light source of this embodiment is a pulse xenon lamp (2), and its spectral energy distribution slightly fluctuates with each emission. Since the light source measurement spectroscopic sensor S2 measures the spectral energy distribution of the pulse xenon lamp (2) at almost the same wavelength as the sample measurement spectroscopic sensor S1, the spectral energy distribution of the sample light measured by the spectroscopic sensor S1 is measured. By dividing each corresponding wavelength by the spectral energy distribution of the light source measured by the spectral sensor S2 and using that value as the measured value, it is possible to eliminate the error due to the variation in the spectral energy distribution of the light source. # 44 to # 47
The calculation is done in. In # 45, CM2 (I) is the measured value corresponding to the I-th silicon photodiode of the spectroscopic sensor S1, and CM2 (I + 40) is the I value of the spectroscopic sensor S2.
The measured values correspond to the second silicon photodiode. The value obtained by dividing CM2 (I) by CM2 (I + 40) is CM3 (I).
To be stored. This is repeated from I = 0 to 39, all measurement values are light source corrected, and stored in CM3 (I). The correction of the fluctuation of the spectral energy distribution of the illumination light source is completed as described above, and the corrected value is stored in CM3 (i) (i = 0 to 39).

Next, in # 48, the wavelength correction is calculated. Here, the meaning of the wavelength correction calculation will be described. The spectral sensors S1 and S2 of this embodiment use a bandpass filter array, and the peak wavelengths are approximately 10 nm intervals, but there is some variation in the wavelength pitch due to an error in manufacturing the filter. The wavelength correction calculation described here corrects this wavelength pitch variation to a value of 10 nm pitch by linear interpolation calculation.

In # 48 of FIG. 9 (d), the wavelength number J is first set to zero. Wavelength number J is 10 in the wavelength range from 400 nm to 700 nm.
It is a number given to wavelengths with nm intervals, and when the wavelength is 400 nm, J = 0
Then, it is a numerical value that increases by 1 for every 10 nm increase. I is the sensor number, which is initialized to zero at # 49. However, I =
0 is the number of the sensor with the shortest peak wavelength,
I increases by 1 toward the long wavelength side. At # 50, the wavelength W corresponding to the wavelength number J is calculated. In # 51,
The peak wavelength PK (I) of the I-th sensor is compared with the J-th wavelength W. If PK (I) <W, the I is incremented by 1 in # 52 and the process returns to # 51. If PK (I) ≧ W, the process proceeds to # 53. That is, in # 51 and # 52, the number of the sensor having the peak wavelength that is equal to or larger than the J-th wavelength W and is closest to W is searched. In # 53 to # 55, W1 and W shown in FIG. 11 are used.
Calculate the value of 2, M. W1 is the peak wavelength PK of the sensor with the peak wavelength closest to W that is greater than or equal to the W determined in # 51 and # 52.
(I) and one of them, the peak wavelength PK of the sensor on the short wavelength side
(I-1) and W2 is the difference between W and PK (I-1). M is the measured value of the I-th sensor CM3 (I)
And the measured value CM3 (I-1) of the (I-1) th sensor
Is the difference. At # 56, the measurement value at the wavelength W is obtained from the measurement values of the I-th sensor and the (I-1) -th sensor by linear interpolation calculation, and the value is defined as MEAS (J). #
At 57, increase the wavelength number J by 1, and at # 58, 400nm ~ 7
To determine if the 00nm range is all over,
It is determined whether or not J is 31, and if it is not 31, the process returns to # 50, and the measured value at the next wavelength is obtained by the above-described interpolation calculation.
If J becomes 31, it means that all the measured values at 10 nm intervals in the range of 400 nm to 700 nm have been obtained by the interpolation calculation. Therefore, proceed to # 59 to end the photometric subroutine and return. In this embodiment, # 49 is used for the sake of clarity.
Although the process from # 54 to # 54 is provided, the sensor number corresponding to the wavelength W, W1, W2, etc. can be calculated in advance and stored in the spectral sensor data storage unit (9). In that case, # 49, # 51, # 52, # 53, # 54 can be omitted.

The photometering circuit operation and the correction calculation process of the present embodiment have been described above. Next, the function and operation of the entire system will be described with reference to the flowcharts of FIG. First, when the system power is turned on, Fig. 12 (a)
Go to step # 100, and set the I / O port (5), external I / O port (10), magnetic storage control unit (11), display control unit (13), keyboard (15), printer (16) to initial settings. Do. Next, in step # 101, the memory and setting data in the data storage unit (8) are initialized. Next, in the step of # 102, the display subroutine is executed, and # 103
It is determined whether or not the key is pressed with. The display subroutine will be described in detail later. If the key is pressed, proceed to # 105 in FIG. 12 (b). If the key is not pressed, the current time is set to the real time clock (1
Input from 7), display the value and return to # 103. FIG. 26 shows an arrangement example of the keyboard (15) used in this embodiment.

In # 105 of FIG. 12 (b), the pressed key is "MEN
If it is the U "key, and if so, execute the setting subroutine that performs the setting-related processing in step # 125 and return to # 102. If the key is not" MENU ", proceed to # 106 and press the key It is determined whether or not it is "CAL", and if so, a calibration subroutine for performing the calibration-related process by the standard reflector is executed in step # 126, and the process returns to step # 102.
If the key is not "CAL", proceed to # 107, determine whether the key is "MEAS", and if so, execute the measurement subroutine for performing the measurement-related process in step # 127.
Return to. However, the measurement subroutine is different from the photometry subroutine described above, and will be described in detail later. The key is "ME
If it is not "AS", proceed to # 108, determine whether the key is "STAT", and if so, proceed to # 128 to execute a statistical subroutine for processing for statistical calculation of measured values.
Return to 2. If the key is not "STAT", proceed to # 109, determine whether the key is "DATA", and if so, proceed to # 129 to set the data number of the measured data to be displayed. Execute the setting subroutine and return to # 103. If the key is not "DATA", proceed to # 110 and determine whether the key is "FEED". If so, # 1
In step 30, a printer paper feed subroutine for feeding paper to the printer (16) is executed, and the flow returns to step # 103. The key is "F
If it is not "EED", proceed to # 111, determine whether the key is "HCOPY", and if so, proceed to # 131, execute the screen copy subroutine for copying the display screen to the printer (16), and proceed to # 103. If the key is not "HCOPY", proceed to # 112, determine if the key is "LIST", and if so, proceed to # 132 to display the numerical data list of measured values on the display (14). Execute the data list subroutine that displays, prints to the printer (16), or outputs to the external input / output port (10), and returns to # 102. If the key is not "LIST", press # 113. Go to, determine if the key is "DEL" and if so go to # 133
A data erasing subroutine for erasing the measurement data currently displayed is executed, and the process returns to step # 102. The key is "DE
If it is not "L", proceed to # 114, determine whether the key is "HELP", and if so, proceed to # 134 to execute a usage instruction subroutine for displaying a description of how to use the system. Return to 102. If the key is not "HELP", # 115
Proceed to to determine whether the key is "CUR", and if so, proceed to # 135 to perform processing to set whether or not to display the cursor in the graph of the spectroscopic measurement value. Cursor ON / O
Execute the FF subroutine and return to # 103. The key is "CUR"
If not, the process proceeds to # 116 to determine whether or not the key is "→", and if so, the process proceeds to # 136 to execute a cursor right move subroutine for performing a process of right moving the cursor of the spectroscopic measurement value graph display. Execute and return to # 103. If the key is not "→", proceed to # 117, determine whether the key is "←", and if so, proceed to 137, and move the cursor in the spectral reflectance graph display to the left. Execute the move subroutine and return to # 103. If the key is not "←", proceed to # 118, determine whether the key is "DOUT", and if so, proceed to # 138 to perform processing of outputting measurement data to the external input / output port (10). Execute the data output subroutine and return to # 103. The key is "DOUT"
If not, proceed to # 119, determine whether or not the key is "PRINT", and if so, proceed to # 139 to execute the data print subroutine for printing the measured data on the printer (16). Return to # 103. If the key is not "PRINT", proceed to # 120 in FIG. 12 (c), determine whether the key is "f1", and if so, proceed to # 140 to measure the spectroscopic measurement graph and chromaticity. Execute the range setting subroutine that performs the process of setting the display scale and display range of the value graph,
Return to # 103. If the key is not "f1", proceed to # 121, determine whether the key is "f2", and if so, proceed to # 141.
A grid ON / OFF subroutine for setting whether or not to display a grid for the scale on the display of the spectral measurement graph and the chromaticity measurement graph is executed, and the process returns to # 103. If the key is not "f2", proceed to # 122, determine whether the key is "f3", and if so, proceed to # 142 to set the color system to be used in the color value calculation. Execute the color system setting subroutine to be performed, and return to # 102. The key is "f3"
If not, proceed to # 123, determine whether the key is "f4",
If so, proceed to # 143, execute the reference value ON / OFF subroutine that performs processing for setting whether or not to display the reference value at the same time as the measurement value in the spectroscopic measurement value graph display, and then return to # 103. . If the key is not "f4", proceed to # 124 to determine whether the key is "f6", and if so, proceed to # 144 to set the format of the graph to be displayed and the unit of the measured value. Execute the display mode setting subroutine and
Return to 102. If the key is not "f6", return to # 103.

The above is a brief description of the processing when various keys are pressed.
A detailed explanation will be given. FIG. 13 is a flowchart of a setting subroutine for performing the above-mentioned setting-related processing.
In step # 200, the user is prompted to select one of 19 types of setting items. Next, proceeding to # 201, it is determined whether or not the selected item is "light source", and if so, proceeding to # 202, the user is given five color values of D65, A, B, C and USER. Select one of the calculation light source types and return to # 200. If the item is not "light source", proceed to # 203, determine whether the item is "field of view", and if so, in # 204, let the user select either a 2 ° field of view or a 10 ° field of view. Return to. If the item is not "field of view", proceed to # 205, determine whether the item is in "trigger mode", and if so, proceed to # 206 to determine how to start measurement. However, the trigger mode is manual, external trigger single shot,
The user is made to select one of four continuous external triggers and a timer, and the process returns to step # 200. If the item is not "trigger mode", proceed to # 207 to determine whether the item is "trace wavelength", and if so, proceed to # 208 to display the temporal change of the spectral reflectance at the selected wavelength. of,
The user sets the selected wavelength, and the process returns to # 200. If the item is not "trace wavelength", proceed to # 209 to determine whether or not the item is "limit warning". If so, in # 210,
When the difference between the reference value and the measured value is equal to or more than the limit value, the user is restrained whether or not to perform the warning process, and the process returns to # 200. If the item is not "limit warning", proceed to # 211 to determine whether the item is "average number of times", and if so, proceed to # 212 and determine how many times the average value of the measurements is used. Let the user set the average count and return to # 200. If the item is not "average count", proceed to # 213 to determine whether the item is "print mode". If so, whether to print the measurement data automatically every measurement (AUTO), Whether measurement data is printed only when the "PRINT" key is pressed (MANUA
Let the user set L) and return to # 200. If the item is not "print mode", proceed to # 215 to determine whether the item is "print item", and if so, proceed to # 216, and when printing the measurement data, spectral data and color calculation value The user is allowed to select which item of one or more items in various data to be printed, and the process returns to step # 200. If the item is not "print item", proceed to # 217, determine whether the item is in "data output mode", and if so, proceed to # 218 and output the measurement data to the external input / output port (10). Have the user set whether to automatically perform each measurement (AUTO) or output measurement data only when the "DOUT" key is pressed (MANUAL), and return to # 200. If the item is not "data output mode", proceed to # 219, determine whether the item is "data output item", and if so, proceed to # 220 and output the measurement data to the external input / output port (10). In doing so, the user is allowed to select which item of one or more types among various data is to be output, and the process returns to step # 200. If the item is not a "data output item", proceed to # 221 to determine whether the item is in "RS232C mode", and if so, proceed to # 222 to inform the user of the baud rate of the RS232C port which is an external input / output port. Set various modes such as or stop bit length and return to # 200. If the item is not "RS232C mode", proceed to # 223, determine whether the item is "timer", and if so, proceed to # 224, start time, interval time, end time or end of the measurement interval timer. The user is made to set the number of times and whether the end is performed at the time or the number of times, and the process returns to step # 200. If the item is not "timer", proceed to # 225, determine whether the item is "clock", and if so, proceed to # 226 to let the user set the current time of the real-time clock (17). Return to 200. # 2 if the item is not "clock"
Proceed to 27, determine whether the item is “user spectral sensitivity”, and if so, proceed to # 228 to input the user spectral sensitivity.

Here, the meaning of the user spectral sensitivity will be described. In general, CIE spectral tristimulus values _{λ 1} , _λ , and _λ are used for color calculation. For example, when measuring the color density of a photograph, the spectral sensitivities shown in FIG. It has been disassembled, and other industries and users may use dedicated spectral sensitivities, and it would be extremely difficult if any spectral sensitivities other than _λ , _λ , and _λ could be used in color measurement. It is convenient. In this embodiment, the data is stored in the data ROM (7) of _{λ 1} , _{λ 2} , and _λ as standard, and is used for color calculation. In addition to this, the user has arbitrary spectral sensitivity (hereinafter referred to as user spectral sensitivity). You can enter the
It is possible to store in M (8), calculate the product sum of the spectral sensitivity, the spectral reflectance of the sample, and the spectral energy distribution of the light source, and display it. Three types of spectral sensitivity can be input, which is convenient for three-color separation.
In # 228 to # 230, input the three types of user spectral sensitivities, and US1 (i), US2 (i), US3 (i) (i = 0
Stored in a memory called ~ 30) and returned to # 200. If the item is not "user spectral sensitivity", proceed to # 231 to determine whether the item is "user light source". If so, # 23
Proceed to 2 and input the data of the spectral energy distribution of the user light source. Here, the meaning of the user light source will be described. In the color calculation of the object color, D65 light source, A light source, B light source, C light source, etc. are used as standard light sources,
In the present embodiment, the data of the spectral energy distribution of those light sources is stored in the ROM (7) and is used for color calculation. In addition to these standard light sources, the user can obtain the spectral energy distribution of arbitrary spectral energy distribution. If the light source can be defined and the color calculation by the light source can be performed, it is convenient for evaluating the color rendering property which is the effect of the light source on the appearance of the object color.
In this embodiment, the user can input an arbitrary spectral energy distribution of the light source (hereinafter referred to as user light source), the data is stored in the RAM (8), and the color is calculated using the light source data. Is possible. #twenty three
In 2, input the spectral energy distribution of the user light source and UP
(I) (i = 0 to 30) stored in the memory, # 200
Return to

If the item is not "user light source", proceed to # 233, determine whether the item is "user standard plate", and if so, proceed to # 234, enter the spectral reflectance data of the user standard plate, and enter R2 ( i) (i = 0 to 30), and return to # 200. The user standard plate will be described in detail in the explanation of the calibration subroutine to be described later, but in short, the user uses the standard plate whose reflectance data is measured by himself / herself using a spectroscope or the like. It is the standard plate when the reflectance is calibrated. If the item is not the "user standard plate", the process proceeds to # 235, determines whether the item is the "limit value", and if so, the process proceeds to # 236. In this embodiment, the upper limit value and the lower limit value of the spectral reflectance can be set for each wavelength, and when the spectral reflectance measurement value is out of the range of the limit value, a warning display is issued. There is. In addition, the upper limit value and lower limit value data can be displayed overlaid on the spectral graph display that displays the spectral reflectance measurement value, so that the relationship between the measured value and the limit value can be seen at a glance. Has become. In # 236, the upper limit value data is input and stored in LIMH (i) (i = 0 to 30), and in # 237, the lower limit value data is input and LIML
(I) Store in (i = 0 to 30) and return to # 200. If the item is not the "limit value", proceed to # 238 and the item is the "reference value".
If yes, proceed to # 239 to perform measurement and select whether to use the measured value as the reference value or enter the spectral reflectance data from the keyboard and use that value as the reference value. Do. # 239 displays the selected items,
Wait for key input at # 240. If there is a key input, proceed to # 241 to determine whether or not the key is 1, and if it is 1, it is a mode in which the measured value is used as a reference value, so proceed to # 242 and execute the photometry subroutine described above. Spectral reflectance R (i) at 243
(I = 0 to 30) is calculated, R (i) is stored in the reference value memory STD (i) (i = 0 to 30) in # 244, and the process returns to # 200. In # 241, if the key is not 1, proceed to # 245,
Whether the number of keys is 2 is determined, and if not, the process returns to # 240 and waits for key input. In # 245, if the key is 2, it is the mode in which the input data from the numeric keypad is used as the reference value data. Therefore, the process proceeds to # 246, and the spectral reflectance data of the reference value is input from the numeric keypad, and the STD (i) ( i = 0-3
Store it in 0) and return to # 200. If the item is not the "reference value", the process proceeds to # 247 to determine whether the item is "end", and if so, the setting subroutine is ended and the process returns.
If the item is not "end", return to # 200.

The description of the setting subroutine is completed above, and then, the calibration subroutine for performing the process of calibrating the reflectance measurement value using the sample whose spectral reflectance is known in advance will be described. FIG. 14 shows a flowchart of the calibration subroutine. In # 300, the user is made to select one of the five items. Explaining five items, "1. High-precision standard white plate" is a calibration that uses an expensive high-precision standard white plate whose spectral reflectance has very little change over time. Is a calibration that uses an inexpensive standard white plate whose spectral reflectance changes over time is higher than that of a high-precision standard white plate, and "3. This is an item to measure the spectral reflectance of a sample other than the attached white plate with a spectroscope and calibrate it using that sample. "4. Calibration mode"
Is an item for selecting the calibration mode, and “5. end” is an item for ending the calibration subroutine.

In # 301, it is determined whether or not the item is “end”. If so, the process proceeds to # 302, the calibration subroutine is terminated, and the process returns. If not, proceed to # 303, determine whether the item is a calibration with a high-precision standard white plate, and if so, # 304
Proceed to and display a message to set a high-precision standard white plate as a sample, and in # 305, select "Measure" and "Stop".
The user is allowed to select one of the two items, and in # 306 it is determined whether or not the item is "stop". If "stop", the process proceeds to # 307 to end the calibration subroutine and return. If the item is not "Cancel", proceed to # 308 to determine whether or not the item is "Measurement", and if not, return to # 305, and if so, execute the photometric subroutine in # 309, # At 310, the measured value MEAS (i) is stored in C0 (i) (i = 0 to 30). Next, in # 311, a message to the effect that the standard white plate is set as a sample is displayed, and in # 312 the user is allowed to select one of two items, “measurement” and “stop”.
Determines whether the item is "Cancel", and if "Cancel",
The calibration subroutine is terminated and the process returns. "Cancel"
If not, the process proceeds to # 314 to determine whether or not the item is “measurement”. If not, the process returns to # 312, and if so, the process proceeds to # 315 to execute the photometric subroutine. Measurement value MEA at # 316
S (i) is stored in C1 (i) (i = 0 to 30). Then # 3
Calculate the spectral reflectance of the regular standard white plate by the formula in 17,
Store in R1 (i) (i = 0 to 30), proceed to # 318, end the calibration subroutine, and return.

R1 (i) = C1 (i) × R0 (i) / C0 (i) (i = 0 to 30) In the above formula, R0 (i) is the spectral reflectance data of the high-accuracy standard white plate. The value is stored in the ROM (7) in advance. That is, in # 304 to # 310, the measurement values were calibrated by the high-precision standard white plate, and in # 311 to # 317, the spectral reflectance of the regular standard white plate was measured and stored. If the item is not "high precision standard white plate" in # 303, proceed to # 319 to determine whether or not the calibration is performed by the common standard white plate. If yes, proceed to # 320 and use the common standard white plate as a sample. Display the message to set, # 321
Then, let the user select one of the two items of "measurement" and "stop", and determine whether or not the item is "stop" in # 322,
If it is “Cancel”, the process proceeds to # 323 to end the calibration subroutine and return. If it is not "Cancel", proceed to # 324 to determine whether the item is "Measurement". If it is not "Measurement", return to # 321. If it is "Measurement", proceed to # 325 and execute the photometric subroutine. . In # 326, the measured value MEAS (i) is changed to C
Store it in 1 (i), proceed to # 327, end the calibration subroutine, and return.

As described above, in the apparatus of this embodiment, the absolute value of the spectral reflectance is calibrated by using a standard white plate,
There is a calibration with a high-precision standard white plate, and an inexpensive regular standard white plate is used for daily calibration. Once a few months, in order to correct the temporal change of the spectral reflectance of the regular standard white plate, , A standard white plate with high precision is used to measure and store the spectral reflectance of a standard white plate.
The high-precision standard white plate is rarely used, and by storing it in an appropriate place, it is possible to prevent changes over time due to dirt and ultraviolet rays, and the standard white plate for regular use is stored once every few months. Since the change is corrected, maintenance is relatively easy. Therefore, this method can configure an inexpensive, workable, and highly accurate measurement system.

By the way, if the item is not the "normal standard white plate" in # 319, the process proceeds to # 328 in FIG. 14 (b) to determine whether the item is the "user standard plate". Proceed to step 1 to let the user select one item from the two items of "measurement" and "stop", and determine whether the item is "stop" in # 330,
If it is "Cancel", the process proceeds to # 331, the calibration subroutine is terminated, and the process returns. If it is not "Cancel", proceed to # 332 to determine whether the item is "Measurement". If it is not "Measurement", return to # 329. If it is "Measurement", execute the photometry subroutine in # 333. Measured value MEAS (i) is C2 (i) at 334
Store in (i = 0 to 30) and return. In # 328, if the item is not "user standard plate", proceed to # 336, determine whether the item is in "calibration mode", otherwise return to # 300, and if so, proceed to # 337. Then, one of the two calibration modes of the standard white plate and the user standard plate is selected and the process returns. If the standard white plate calibration mode is selected, # 320 to # 3 will be used when calculating the spectral reflectance of the sample.
Value obtained by calibration using a standard white plate performed in Step 26
C1 (i) and the spectral reflectance data R1 (i) of the standard white plate for common use measured in # 311 to # 317 are used. When the calibration mode of the user standard plate is selected, when calculating the spectral reflectance of the sample, the value C2 (i) obtained by the calibration with the user standard plate of # 329 to # 334 and # 234 of the setting subroutine The input spectral reflectance data R2 (i) of the user standard plate is used.

This is the end of the description of the calibration subroutine, and then the measurement subroutine will be described. FIG. 15 is a flowchart of the measurement subroutine. In # 400, first, the trigger mode is determined, and if it is the manual mode, the process proceeds to # 406, and if it is the timer mode, the process proceeds to # 401. In # 401,
Input the data of the real time clock (17) and determine whether the current time has passed the measurement start time set in # 224 of the above-mentioned setting subroutine. If "NO", proceed to # 402. It is determined whether or not the stop key is pressed, and if it is pressed, the process proceeds to step # 403 to end the measurement subroutine and return. If the stop key is not pressed, the process returns to # 401. If the current time has passed the measurement start time in # 401, the process proceeds to # 404 and the number of measurements J is cleared to zero. Next, at # 405, the current time is stored in the register T, and the routine proceeds to # 406. In # 406, a photometric subroutine is executed, and in # 407, a reflectance calculation subroutine is executed. The calculation result is stored in R (i). Details of the reflectance calculation subroutine will be described later. In # 408, execute a calculation subroutine that performs calculations such as color calculation and limit determination,
In # 409, a calculated value display subroutine for displaying the measured value and the calculated value is executed. In # 410, it is determined whether or not there is a free area in the measurement value memory. If there is no free area, the procedure proceeds to # 411, in which there is no free area in the measurement value memory and the current measurement value is not stored. Give a warning and proceed to # 412. If there is a free area in the measured value memory, proceed to # 413 and indicate the last measured data number N
1 is added to 1, and in # 414, N1 is substituted for N2 indicating the number of the displayed data. In # 415, the value of N2, which is the number of the data being displayed, is displayed. Then, in # 416, the spectral reflectance calculation value R (i) (I = 0 to 30) is stored in the N1th measurement value memory. Store in and proceed to # 412. In # 412, it is determined whether the print mode is AUTO. If it is AUTO, the process proceeds to # 417, the print item selected in # 216 of the setting subroutine is printed by the printer (16), and the process proceeds to # 418. . If the print mode is not AUTO in # 412, the process proceeds to # 418. #Four
In 18, it is determined whether or not the data output mode is AUTO, and if it is AUTO, the process proceeds to # 419, and the data output item selected in # 220 of the setting subroutine is output to the external input / output port (10). Go to. In # 418, the data output mode is
If not AUTO, go to # 420. In # 420, the trigger mode is determined, and if it is the manual mode, the process proceeds to # 421 to end the measurement subroutine and return. If it is the timer mode, proceed to # 422 and increase the number of times of measurement J by 1 and determine the timer end mode at # 423.
Is equal to the number of end times set in # 224 of the setting subroutine, and if they are equal, proceed to # 425, terminate the measurement subroutine and return, and if not equal, # 42.
Go to 6. In # 423, if the timer end mode is the time end mode, the process proceeds to # 426. # In 426, determine whether or not the cancel key is pressed, and if it is pressed #
Proceed to 425 to end the measurement subroutine and return. If the stop key is not pressed, the process proceeds to # 427, and it is determined whether or not the current time has passed the time T, which is the last measurement, plus the interval time set in # 224 of the setting subroutine, If the time has elapsed, return to # 405 and repeat the measurement. If it has not elapsed, the process proceeds to # 428 to determine the timer end mode, and if it is the end mode by the number of times, the process returns to # 426 to repeat the stop key and the interval time check. If it is the time end mode, proceed to # 429 to determine whether or not the current time has passed the end time, and if it is, proceed to # 425 to end the measurement subroutine and return. If # 426
Return to and repeat the check of the stop key, interval time, and end time.

This is the end of the description of the measurement subroutine, and then the reflectance calculation subroutine used in # 407 of the measurement subroutine and # 243 of the setting subroutine will be described. FIG. 16 is a flowchart of reflectance calculation. The reflectance calculation is
The spectral reflectance of the sample is calculated from the spectral reflectance data of the standard plate used for the calibration, the measured value, and the measured value of the sample. In # 500, the wavelength counter I is first cleared to 0. In # 501, the current calibration mode is standard white plate or user standard plate. This calibration mode is set in # 337 of the calibration subroutine. If the calibration mode is the standard white plate, the spectral reflectance R (I) of the sample at the I-th wavelength is calculated by the formula in # 502, and the process proceeds to # 504.

In the above equation, MEAS (I) is the measured value of the sample, C1 (I) is the measured value of the standard white plate used in the calibration, and R1 (I)
Is the spectral reflectance of the standard white plate used in the calibration process. If the calibration mode is the user standard plate in # 501, the spectral reflectance R (I) of the sample at the I-th wavelength is calculated by the equation in # 503, and the process proceeds to # 504.

In # 504, the wavelength counter I is incremented by 1, and in # 505, I
Is determined to be 31 or not. In this embodiment, the reflectance of 10 nm pitch in the wavelength range from 400 nm to 700 nm is calculated.
Is 0 to 30, and the reflectances of all wavelengths are calculated when I becomes 31, so if I is 31, # 50
Proceed to 6 to end the reflectance calculation subroutine and return. If I is not 31, the process returns to # 501 and is repeated until the reflectance calculation for all wavelengths is completed. This is the end of the description of the reflectance calculation subroutine.

Next, the calculation subroutine used in # 408 of the measurement subroutine will be described. This subroutine is the spectral reflectance R of the sample calculated by the reflectance calculation subroutine.
This is a subroutine for performing various color calculations and limit determination processing based on (i). FIG. 17 is a flowchart of the calculation subroutine. The display system mode is determined in # 600, and if the color system mode is the user spectral sensitivity mode, the process proceeds to # 601. The type of the light source selected in # 202 of the setting subroutine is determined in # 601 to # 609, and the spectral energy distribution data of the selected light source is stored in P (i). If the selected light source is any one of D65, A, B and C light sources, the spectral energy distribution data D65 (i), A (i), B stored in the ROM (7) in advance.
Store (i), C (i) (i = 0 to 30) in P (i).
If the selected light source is the user light source, the spectral energy distribution data UP (i) of the user light source set in # 232 of the setting subroutine is stored in P (i). # 61
At 0, color calculation is performed for the first user spectral sensitivity US1 (i). As shown in the flow chart, the spectral energy distribution P (i) of the light source and the first user spectral sensitivity
A value obtained by dividing the product sum of the spectral reflectance R (i) of US1 (i) and the sample in the measurement wavelength region by the product sum of P (i) and US1 (i) in the measurement wavelength region is 1 Th user color data UC
Substitute in (1). In # 611 and # 612, the second,
The third user spectral sensitivities US2 (i) and US3 (i) are calculated in the same manner as in # 610, and are substituted into the second and third user color data UC (2) and UC (3), respectively.
Next, regarding the spectral reflectance data STD (i) of the reference value set after # 239 of the setting subroutine in # 613, # 614, # 615, the user spectral sensitivity US1 (i), US2 (i), US3
Color calculation for (i) is performed and the values are respectively
Store in (1), USTD (2), USTD (3). Then # 616
Then, set the user spectral sensitivity number I to 1, and in # 617, the color system determines whether the logarithmic mode of the user spectral sensitivity is the percent mode.
Recalculate (I) and USTD (I) from the percent value to the absorbance value. When the spectral sensitivity for color density measurement of color photographs is set as the user spectral sensitivity and color measurement of color photographs is performed, color evaluation is generally performed with a logarithmic value, so the absorbance value that is a logarithmic value is used. The calculation function is very effective. In # 620, the difference between the measured value and the reference value is calculated, and ΔUC
Store in (I). If the color system is percentage mode instead of logarithmic mode, proceed to # 622, and use UC (I) and USTD.
Calculate the ratio with (I) and store in ΔUC (I),
Go to 1. By adding 1 to I in # 621 and discriminating the value of I in # 623, # 617 to # 621 are obtained for I = 1, 2, and 3.
And proceed to # 624.

In # 600, if the color system is not the user spectral sensitivity mode but the XYZ mode, the tristimulus value data (previously stored in ROM (7) in the field of view (2 ° or 10 °) selected in the setting subroutine in # 625. Stored), the data of the spectral energy distribution of the selected light source, and the spectral reflectance data of the sample, the color calculation in the normal XYZ color system or X ₁₀ Y ₁₀ Z ₁₀ color system is performed. Go to # 624. In # 624, the limit warning mode selected in # 210 of the setting subroutine is discriminated, and if the limit discrimination warning is given (ON), the process proceeds to # 625. In # 625, the wavelength number I is cleared to zero. In # 626, the spectral reflectance R of the sample at the I-th wavelength
(I) is greater than or equal to the upper limit value LIMH (I) of the spectral reflectance at the I-th wavelength set in # 236 of the setting subroutine, and if so, the process proceeds to # 627 and the sample A limit warning display indicating that the spectral reflectance is outside the allowable range is displayed, the arithmetic subroutine is terminated, and the process returns. # 626
If R (I) is smaller than LIMH (I), the process proceeds to step # 628, and the spectral reflectance R (I) of the sample at the I-th wavelength is measured at the I-th wavelength set in # 237 of the setting subroutine. It is determined whether the spectral reflectance is below the lower limit value LIML (I),
If so, proceed to # 627, display a limit warning indicating that the spectral reflectance of the sample is outside the allowable range, and return. In # 628, if R (I) is larger than LIML (I), proceed to # 629, add 1 to the wavelength number I,
Continue to # 630. In # 630, in order to determine whether or not all wavelengths have ended, it is determined whether or not I is 31, and if "NO", the limit determination after # 626 is repeated for the next wavelength. If "YES", the spectral reflectance of the sample at all wavelengths is within the allowable range.
In # 631, the limit warning display is erased, the calculation subroutine is terminated, and the process returns. In # 624, if the limit warning mode is a mode (OFF) in which the limit determination warning is not issued, the limit determination is not performed, the process immediately proceeds to # 631, the limit warning display is erased, and the process returns. This is the end of the description of the calculation subroutine.

Next, the calculation value display subroutine used in # 409 of the measurement subroutine will be described. FIG. 18 is a flowchart of the calculation value display subroutine. Fig. 19 (a)
An example of the display is shown in (b). In # 700, it is determined whether or not the display mode set in the display mode setting subroutine of # 144 in FIG. 12 (c) is the spectral reflectance display mode. If “YES”, the process proceeds to # 701. If the previous measured value is currently displayed on the spectral reflectance graph, it is deleted and the spectral reflectance measured value currently stored in R (i) is displayed on the spectral reflectance graph. Here, it is determined whether or not the cursor display mode is ON, and when it is ON, the cursor currently displayed on the spectral reflectance graph and the numerical display of the data at the cursor point are corrected to correspond to the new measurement value. Processing is also performed. Next, after # 702, a time change graph of the spectral reflectance at the selected wavelength is displayed. First, in # 702, the selected wavelength number I is set to zero. In this embodiment, three types of wavelengths, WL (0), WL (1), and WL (2), are selected as 400 nm to 7 nm.
It can be set in 1nm pitch in the range of 00nm, and it is set in # 208 of the setting subroutine. Since the measured spectral reflectance values are at 10 nm intervals, the spectral reflectance at the selected wavelength is calculated by interpolation. In # 703, a value obtained by cutting off the ones digit of the I-th selected wavelength WL (1) is substituted for WL. In # 704, the wavelength number k corresponding to the wavelength WL is calculated. # 705
Then, the spectral reflectance R (k) at the wavelength WLnm and the wavelength (WL-
Using the value of the spectral reflectance R (k-1) at 10) nm,
The spectral reflectance at the wavelength WL (I) is obtained by interpolation calculation and substituted into y. In # 706, the value of I is determined and I = 0
If it is # 707, the X mark is drawn, if I = 1, the # mark is drawn in # 708, and if I = 2, the O mark is drawn in # 709 at the coordinate (N2, y) of the time change graph. That is, the data at the 0th selected wavelength WL (0) is marked with an X so that the data of the three selected wavelengths can be identified.
The data at is the ● mark and the second selected wavelength is WL.
The data in (2) is indicated by a circle. Where N2
Is the data number of the data to be displayed, as described in the measurement subroutine. In # 710, add 1 to I, and in # 711, I
The value of is determined, and for all of I = 0,1,2, # 703- #
Perform the process of 710 and proceed to # 712. In the time change display,
The graph displayed immediately before is not overwritten and new data is overwritten.Since the oldest to the latest data of the spectral reflectance of the selected wavelength is displayed from left to right side at the same time, The user can see the change over time. Also, in the spectral reflectance graph, a straight line is drawn vertically at the position of the selected wavelength with a broken line, and the marks ×, ●, and ○ corresponding to each selected wavelength are drawn above it (see FIG. 19 ( (See a)), the relationship between the selected wavelength and the mark can be seen at a glance. Next, in # 712, it is determined whether or not the cursor is currently displayed. If it is displayed, the process advances to # 713 to move the cursor displayed on the reflectance time change graph to the position N2 on the horizontal axis. This cursor indicates which data on the time change graph the data being displayed on the spectral reflectance graph corresponds to. If the cursor is not being displayed at # 712, the process immediately proceeds to # 714. # 714
In, the color calculation value calculated in the calculation subroutine is displayed numerically, the process proceeds to step # 715 to end the calculation value display subroutine and return. If the display mode is not the spectral reflectance display mode in # 700, it is the color graph display mode, so the process proceeds to # 716, and thereafter, the color graph display is performed (see FIG. 19 (b)). In # 716, it is determined whether the current color system is the XYZ color system or the user spectral sensitivity color system. If it is the XYZ color system, proceed to # 717 and plot the Yxy calculated value on the Yxy chromaticity coordinate graph. And proceed to # 714. If the color system is the user spectral sensitivity color system, proceed to # 718 to # 720, and mark x on the coordinates (N2, UC (1)) of the time change graph of the user color and the coordinates (N2, UC (2)). ) And a circle mark on the coordinates (N2, UC (3)), and proceed to # 712. UC (1), UC (2), U
C (3) is a color calculation value corresponding to each of the user spectral sensitivities US1 (i), US2 (i), and US3 (i) as described in the calculation subroutine. In # 712 to # 713, similar to the time change graph of spectral reflectance, a cursor is displayed to indicate the position on the time change graph of the user color where the data corresponding to the data number being displayed is displayed. The color calculation value is displayed numerically at # 714 and the process returns. In this embodiment, UC (1), UC (2), UC are displayed on the time display graph of the user color.
The value of (3) is plotted in a graph, and Δ representing the deviation from the standard
It is also easy to provide a function to graph UC (1), ΔUC (2), and ΔUC (3). In addition, in order to identify the plot points in the time change graph of the spectral reflectance and the time change graph of the user color, the marks of the plot points are marked with ×, ●,
It is identified by changing it to ◯, but when the display device is in color, it may be distinguished by the color to be displayed. This is the end of the description of the calculated value display subroutine.

Next, the data number setting subroutine will be described. FIG. 20 shows a flowchart of the data number setting subroutine. In this subroutine, data of an arbitrary number is called out from the N1 measurement value memories for display, and is processed as reflectance data. The user inputs the data number, and the memory contents of that data number is called, but the input of that data number can also be set with numeric data using the numeric keypad, and also "↑", "↓" It is also possible to continuously increase or decrease the data number by using the "," → "," ← "keys. By continuously increasing or decreasing the data number and displaying the stored contents of the data number on the graph every time the data number changes, the temporal change of the spectral reflectance data is recognized as a moving image of the spectral reflectance graph. can do. Less than,
Description will be given along the flowchart of FIG. # 800,
First, it is determined whether or not N1 (data number of the final measurement value) is zero. If N1 is zero, it means that there is no measured value, so proceed to # 801 without doing anything and return. If N1 is not zero, proceed to # 802 and wait until there is a key input. If there is a key input, proceed to # 803 to determine whether or not the key is a numeric key. , In variable N. In # 805, it is determined whether or not the value of the variable N is an appropriate value, and if "YES", N is assigned to N2, and the process proceeds to # 807. As described above, N2 is a variable that represents the data number of the data being displayed. If N is not an appropriate value in # 805, the value of N2 is not changed and the process proceeds to # 807. # 807
Then, the value of N2 is displayed as the data number display. In # 808, the N2 measurement value memory is stored in the spectral reflectance data R (i).
MEM (N2, i) is stored, the calculation subroutine is executed using the R (i) in # 809, the calculation value display subroutine is executed in # 810, and the process returns to # 802. If the key is not a numeric key in # 803, proceed to # 811. # 811
Then, 5 is set to the variable k for adjusting the data number changing speed. The larger the value of k, the slower the speed of changing the data number. In # 812, the contents of the key input are KM
Is stored in the variable. # In 813, determine whether the contents of the key input and the contents of KM are equal, and if they are equal, #
Continue to 814. # 814 determines if the key is a cancel key,
If it is the cancel key, the process proceeds to step # 815 to end the data number setting subroutine and return. If it is not the abort key #
Proceed to 816, and then determine the contents of the key input with # 816 to # 824. If the key input is the "↑" key, use 10; if it is the "↓" key, use -10; If it is the "←" key, -1 is set to the data number change value d, and if it is the other key, 0 is set to the data number change value d, and the flow proceeds to # 825. In # 825, the value obtained by adding d to N2 is substituted, and the appropriateness of the value of N is determined in # 826 to # 830. If N is less than or equal to zero, set N2 = 1, and if N is greater than the data number N1 of the final measurement value, set N2 = N1. # 831
Go to. If N is an appropriate value, substitute the value of N for N2 # 831
Go to. The value of N2 is displayed as the data number display in # 831, the contents of the N2th measurement value memory MEM (N2, i) is stored in the spectral reflectance data R (i) in # 832, and the calculation subroutine is executed in # 833. Then, in # 834, a calculation value display subroutine is executed. After # 835, it waits for the time for determining whether the key is continuously pressed and adjusting the data change speed. In # 835, it is determined whether or not a key is pressed, and if not pressed, the flow returns to # 802 to wait for a new key input. If it is pressed, # 836 waits for 100 msec. In # 837, 1 is subtracted from k, and in # 838, it is determined whether or not k is zero, and # 835 to # 837 are repeated until it becomes zero. k
If becomes 0, # 1 is set to k in # 839 and the process returns to # 813.
In # 813, the memory KM of the key input contents is compared with the current key input contents. If they do not match, the process returns to # 802 and waits for a new key input, but if they match, the data number increase / decrease is repeated. That is, if you press and hold one of the keys "↑", "↓", "→", "←", the data number will be increased or decreased continuously, but from the first data number increase or decrease to the second data number increase or decrease. It is a time interval of 500 msec, and 100 after that.
The time interval is msec. If the "↑" and "↓" keys are used, a fast increase / decrease of 10 units is performed, and if the "→" and "←" are used, a slow increase / decrease of 1 unit is performed. That is, a total of 4
There is a speed for changing the data number in stages, and when viewing the temporal change of the spectral reflectance as a moving image of the spectral reflectance graph, it is convenient because the speed can be selected. This is the end of the description of the data number setting subroutine.

Next, the display subroutine used in # 102 of the flowchart of the main program of FIG. 12 (a) will be described. The "calculated value display subroutine" described above was to display the measured value or calculated value on the already displayed graph scale, but the "display subroutine" explained below is the display mode, color system and selected wavelength. When the graph is redrawn from the beginning with a new display mode, color system, selected wavelength, etc., after the change etc. This is a subroutine used when performing. 21st
The figure is a flowchart of the display subroutine. An example of the display is shown in FIG. In # 900, erase all display. The display mode is determined in # 901. If the spectral reflectance display mode is selected, the flow advances to # 902 to draw the frame and unit of the spectral reflectance graph and the frame and unit of the spectral reflectance temporal change graph. In # 903, it is determined whether the grid display mode is ON or OFF. If the grid display mode is ON, a grid is drawn in the spectral reflectance graph and the spectral reflectance temporal change graph in # 904 (see FIG. 19C). If the grid display mode is OFF in # 903, the process proceeds to # 905 without passing through # 904. At # 905, a vertical broken line for indicating the position of the selected wavelength for the time change display and marks x, ●, and ○ are drawn on the spectral reflectance graph. In # 906, it is determined whether the limit warning mode is ON or OFF. If it is ON, # 907
Spectral reflectance upper limit data LIMH (i) and lower limit data
LIML (i) and graph are displayed on the spectral reflectance graph and the process proceeds to step # 908. If OFF, go to # 908. # 908
Then, it is determined whether or not the cursor display mode is ON, and if it is ON, the cursor is drawn at # 909, the numerical data of the cursor point is displayed, and the process proceeds to # 910 (see FIG. 19 (d)). If it is OFF, proceed directly to # 910. In # 910, it is determined whether or not the reference value display mode is ON. If it is ON, the reference value data S is sent in # 911.
Display TD (i) on the spectrum graph and proceed to # 912. If it is OFF, proceed directly to # 912. If the display mode is color graph display mode in # 901, proceed to # 926 to determine whether the color system is the XYZ color system or the user spectral sensitivity color system. If the color system is the XYZ color system, the Yxy graph frame is displayed. The unit is drawn, and in the case of the user spectral sensitivity color system, the frame and unit of the time change graph of the user color are drawn. In # 929, it is determined whether the grid display mode is ON or OFF. If it is ON, the grid is drawn on the Yxy graph or the user color time change graph in # 930, and the process proceeds to # 912. If it is OFF, proceed to # 912 without doing anything. # 912 to # 917
Then, in order to plot all the memory contents of the 1st to N1th measured values on the spectral reflectance time display graph, Yxy graph, or user color time change graph, from the 1st measured value memory MEM (1, i) Spectral reflectance R in order toward the N1th measurement value memory MEM (N1, i)
Substitution to (i), calculation subroutine, and calculation value display subroutine are executed. # 918 to # 922 are processes for displaying the spectral reflectance graph of the N2th measurement value memory MEM (N2, i), color calculation values, etc., and # 918 is a frame for displaying numerical values of color values. Draw a unit and MEM (N2, i) with # 919
Is substituted for R (i), the calculation subroutine is executed in # 920, the value of N2 is displayed as the data number in # 921, the calculation value display subroutine is executed in # 922, and the process returns. This is the end of the description of the display subroutine.

Next, the grid ON / OF used in # 141 of Fig. 12 (c)
The F subroutine will be described. This subroutine erases the grid display if the grid is being displayed, draws the grid display if the grid is not being displayed, and if the cursor is being displayed, deletes the cursor display and then draws the grid. To do. The flowchart is shown in FIG.

Next, turn ON / OF the cursor used in # 135 of Fig. 12 (b).
The F subroutine will be described. This sub-routine erases the numeric display of the cursor display and the data of the cursor point when the cursor is being displayed when the display mode is the spectral reflectance display mode, displays the cursor when the cursor is not being displayed, and displays the data of the cursor point as a numerical value. If it is to be displayed and the grid is being displayed, the grid and the data at the cursor point are drawn after the grid is erased. The flowchart is shown in FIG. As can be seen from the explanation of the grid ON / OFF subroutine and the cursor ON / OFF subroutine, consideration is given not to mix the grid display and the cursor display, and it is possible to prevent the graph from becoming difficult to see due to the mixture of the grid and the cursor.

Finally, the reference value ON / OF used in # 143 of Fig. 12 (c)
The F subroutine will be described. This subroutine is for the reference value STD when the display mode is the spectral reflectance display mode.
It is to switch whether or not (i) is displayed on the spectral reflectance graph at the same time as the measured value. When the reference value STD (i) is displayed on the graph, the display is erased and STD (i) is displayed.
When is not displayed on the graph, the reference value STD (i) is displayed on the spectral reflectance graph. The flowchart is shown in FIG.

(Effects of the Invention) Since the present invention is configured as described above, an arbitrary coefficient is set for each wavelength by the coefficient setting means, and the product of the coefficient set and the spectroscopic measurement value for each wavelength is set by the product sum calculation means. By calculating the added value of, there is an effect that it is possible to know the light of the light source and the output when the color of the object is measured by a light receiver having an arbitrary spectral sensitivity. For example, it can be used in various fields such as photographic color density measurement and printing color density measurement.

Further, in the merged invention, in the spectroscopic measurement device that illuminates the sample with the illumination light source and measures either the spectral reflectance or the spectral transmittance of the sample, the combination of the coefficient set and the spectroscopic measurement value as described above is used. When calculating the added value of the product for each wavelength, the spectral distribution of the light source used for color evaluation calculation is also multiplied, so that the appearance of the color of an object under an illumination light source with an arbitrary spectral distribution can be known. The effect is that you can.

If the coefficient setting unit can set a plurality of coefficient sets and the product-sum calculation unit can calculate a product sum for each coefficient set, a plurality of spectral sensitivities can be set. This is advantageous for measuring the decomposition value.

If the product-sum calculation means is configured to calculate the logarithmic value of the product-sum calculated value, the photographic color density and the like will be evaluated logarithmically. It is advantageous.

Further, if the coefficient setting means is configured to display the set coefficient value in the form of a graph, the set coefficient value can be easily confirmed in the form of a graph, so that an error in setting the coefficient can be prevented.

[Brief description of drawings]

FIG. 1 is a claim correspondence diagram showing the basic configuration of the present invention, and FIG.
FIG. 4 is a block diagram showing the overall configuration of a spectroscopic measurement device according to an embodiment of the present invention, FIG. 3 is a circuit diagram of a current-voltage conversion integration circuit used in the same as above, and FIG. 4 is a photometric circuit in the same as above. FIG. 5 is a circuit diagram showing one block, FIG. 5 is a circuit diagram of a photometry circuit used in the same as above, FIG. 6 is a timing chart for explaining the operation of the circuit in FIG. 3, and FIG. 7 is an illumination circuit used in the same as above. FIG. 8, FIG. 8 is a timing chart showing the photometric timing in the same as above, FIGS. 9A to 9D are flowcharts showing the photometric operation in the above, and FIG. 10A is the spectral sensitivity of the photometric circuit in the above. FIG. 10 (b) is an explanatory view for explaining the division of the wavelength region in the same as above, FIG. 11 is an explanatory view for explaining the wavelength correction in the same as above, and FIGS. 12 (a) to (c) ) Is the entire system in the same as above. Flow chart for explaining the operation of the flow chart of setting subroutine in Fig. 13 (a) to (c) are same as above, the flow chart of the calibration subroutine in FIG. 14 (a) (b) is same as above, 15
Figures (a) to (c) are the flowchart of the measurement subroutine in the same as above, Figure 16 is the flowchart of the reflectance calculation in the above, Figure 17 (a) to (c) is the flowchart of the calculation subroutine in the above, and Figure 18 is Flow chart of the calculation value display subroutine in the same as above, FIGS. 19 (a) to (d) are explanatory views showing a display example of the display section in the same as above, and FIGS. 20 (a) and 20 (b) are flow charts of the data number setting subroutine in above , FIG. 21 is a flowchart of a display subroutine in the same as above, FIG. 22 is a flowchart of a subroutine for displaying grid in the same as above, FIG. 23 is a flowchart of a subroutine for displaying cursor in above, and FIG. 24 is a reference value in above. Flowchart of Subroutine for Display, No. 25
FIG. 26 is a diagram showing a spectral sensitivity for color density measurement of photographs that can be used in the same as above, and FIG. 26 is a diagram showing an arrangement example of a keyboard used in the above. (US) is a coefficient setting means, US1 (i), US2 (i), US3
(I), ... Coefficients, R (i) is a spectroscopic measurement value, (ΣM) is a product-sum calculation means, (1) is a sample, (2) is an illumination light source, and P is
(I) is the spectral distribution of the illumination light source.

Claims (5)

[Claims] 1. The spectroscopic measurement apparatus has a coefficient setting means for setting an arbitrary coefficient for each wavelength and a sum of products calculation means for calculating an added value of products of the spectroscopic measurement value and the coefficient set for each wavelength. A spectroscopic measurement device comprising: 2. The apparatus according to claim 1, wherein the coefficient setting means can set a plurality of coefficient groups, and the sum of products calculating means calculates the sum of products for each coefficient group. A spectroscopic measurement device characterized by being a calculation means. 3. The apparatus according to claim 1, wherein the product-sum calculation means is a calculation means capable of calculating a logarithmic value of the product-sum calculation value. 4. The spectroscopic measurement apparatus according to claim 1, wherein the coefficient setting means includes a display means for displaying the set coefficient values in a graph. 5. In a spectroscopic measurement device for measuring either spectral reflectance or spectral transmittance of a sample, a coefficient setting means for setting an arbitrary coefficient for each wavelength and a light source used for spectroscopic measurement values and color evaluation calculation. A spectroscopic measurement device comprising: a product-sum calculation means for calculating an added value of a product of the spectral distribution and the coefficient set for each wavelength.