JPH03181827A - Apparatus for measuring hue - Google Patents

Abstract

PURPOSE:To inform the hue of a painting color by comparing the reference color data read from a reference color memory corresponding to the change-over of the painting color to a running body with the hue data calculated from the spectral data from a spectroscope by a hue operation means. CONSTITUTION:A strip 1 is painted with a desired color in a coater 2 and heated in an oven 3 to be supplied to the lower part of a luminous spectroscope 5 through a pridle roll 4. Next, the spectral distribution data calculated by the spectroscope 5 is sent to a hue operation apparatus 20 which in turn compares the reference color data read from a reference color memory 35 with the color difference calculated from the spectral data from the spectroscope 5 to display the hue of the painting color of the strip 1. Therefore, even when the painting color of the strip 1 is changed over, color difference can be calculated continuously and automatically. At this time, an unpainted part can be also certainly discriminated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a color tone measuring device that measures the color tone of a steel sheet that is flowing, for example, in a continuous coating steel sheet line.

(Prior art) As such a color; 11i1Fj determination device, for example,
There is a technique described in Japanese Patent No. 9-57123.

This technology is equipped with a spectrometer that compares and processes the spectral data of the paint color of the steel plate measured by the spectrometer with reference color data to measure the tone of the paint color of the steel plate flowing on the line. .

(Problem to be Solved by the Invention) By the way, in a continuous coating steel plate line, the coating color of the steel plate is changed. If this paint color change is made,
The setting of the reference color data for the switched paint color must be changed, and this setting change is performed each time by the operator. Therefore, the yield of painted steel sheets decreases.

Also, when the paint color is changed, for example from red to blue, an unpainted area will appear between the red and blue colors on the steel plate, and this unpainted area will be measured as a color tone deviation. False alarms may occur.

Furthermore, this type of apparatus requires calibration within several hours, but this calibration work is performed by an operator, which is complicated and leads to a decrease in the yield of coated steel plates.

Furthermore, there are cases where a test coat is applied to a steel plate, but in this case, it is necessary to immediately measure the color tone of the test coat and check the concentration. It is necessary to shorten the interval between flashes. However, in reality, it is not possible to shorten the light emission interval of the light source in order to ensure the life of the light source of the light emitter. For this reason, it takes time to measure the color tone of the trial coating, which is one of the causes of a decrease in yield.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a color tone measurement device that can continuously measure the tone of a paint color even when the paint color is changed.

Another object of the present invention is to provide a color tone measurement device that can continuously measure the color tone of a painted color even when the paint color is changed, and can also determine unpainted areas.

Another object of the present invention is to provide a color tone measurement device that can continuously measure the color tone of a paint color even when the paint color is changed and can automatically calibrate the color tone.

A further object of the present invention is to provide a color tone measuring device that can continue to measure the tone of a paint color even when the paint color is changed, and can also handle trial coating.

(Means for Solving the Problems) The present invention provides a color tone measuring device for measuring the color tone of a moving object whose paint color is changed, which includes a spectrometer that receives reflected light from the moving object and outputs spectral data; a reference color memory that stores multiple reference color data for colors to be painted;
The color tone of the paint color of the moving object is reported by comparing the reference color data read from the reference color memory with the data regarding the color tone obtained from the spectral data from the spectrometer in response to switching of the paint color of the moving object. The present invention is a color tone measurement device that is equipped with a color tone calculation means to achieve the above object.

In addition to the above-mentioned means, the present invention also includes unpainted determination means for determining an unpainted part by comparing the color tone obtained by the color tone calculating means with preset data regarding the color tone of an unpainted traveling object. This is a color tone measurement device that attempts to achieve the above objectives.

In addition to the above means, the present invention also provides a calibration plate coated with a predetermined color, a calibration means for arranging a spectrometer above the calibration plate when the calibration time comes, and a method for applying the coating color to the moving object and the calibration plate. color tone calculation means for reporting the color tone of the paint color of the traveling object by comparing the reference color data read from the reference color memory in response to switching of the reference color data with the data regarding the color tone obtained from the spectral data from the spectrometer. This is a color tone measurement device that attempts to achieve the above objectives.

In addition to the above-mentioned means, the present invention also provides a trial coating processing means for shortening the detection interval of a spectrometer when wiping a moving object, and a test coating processing means for shortening the detection interval of a spectrometer when wiping a moving object, and a test coating processing means for applying a trial coating to a moving object and switching the paint color. The above object is achieved by comprising a color tone calculation means that compares the reference color data read from the reference color memory with the data regarding the color tone obtained from the spectral data from the spectroscope to report the tone of the paint color of the moving object. This is a color tone measuring device.

Furthermore, the present invention provides a color tone measurement device for measuring the color tone of a moving object whose paint color is changed, including a spectrometer that receives reflected light from the moving object and outputs spectral data, and a reference color for the color to be painted on the moving object. A reference color memory that stores multiple data, a calibration plate coated with a predetermined color, a calibration means that places a spectrometer above the calibration plate when the calibration time comes, and a spectrometer that is used when trial painting a moving object. test coating processing means for shortening the detection interval, and test coating on a moving object, and determination from the reference color data read from the reference color memory and spectral data from the spectrometer in response to switching of the paint color and calibration plate. A color tone calculation means for reporting the color tone of the painted color of the moving object by comparing data regarding the color tone, and comparing the color tone obtained by the color tone calculation means with preset data regarding the color tone of the unpainted traveling object. This is a color tone measurement device that attempts to achieve the above object by including a non-painting determination means for determining an unpainted portion.

(Function) By providing such a means, the reference color data read out from the reference color memory and the data regarding the color tone determined from the spectral data from the spectrometer in response to switching of the paint color on the moving object can be The color tone calculation means compares the colors and reports the color tone of the paint color of the moving object.

Furthermore, by providing the above means, the unpainted portion is determined by comparing the color tone obtained by the color tone calculation means with preset data regarding the color tone of the unpainted traveling object by the unpainted determination means.

Further, in the present invention, when the calibration time comes, the spectrometer is placed above the calibration plate by the calibration means. Then, during the switching time of the calibration plate, the reference color data read from the reference color memory and the data regarding the color tone obtained from the spectral data from the spectrometer are compared by the color tone calculation means, and the color tone of the coating color of the moving object is determined. be notified.

Further, in the present invention, the detection interval of the spectrometer is shortened by the trial coating processing means when trial coating the moving object. Then, during this trial coating, the reference color data read from the reference color memory and the data regarding the color tone obtained from the spectral data from the spectrometer are compared by the color tone calculation means, and the color tone of the paint color of the moving object is notified. be done.

Further, in the present invention, the reference color data read out from the reference color memory in response to switching of the coating color to the moving object is compared by the color tone calculation means with the data regarding the color tone obtained from the spectral data from the spectrometer. The color tone of the paint color of the object is notified, and this color tone is compared with preset data regarding the color tone of an unpainted moving object by the unpainted determination means to determine the unpainted part, and when the calibration time comes, the calibration means The spectrometer is placed above the calibration plate, and the detection interval of the spectrometer is shortened by the trial coating processing means during trial coating, and the calibration time and the standard read from the reference color memory during trial coating are The color data and the data regarding the color tone determined from the spectral data from the spectrometer are compared by the color tone calculation means, and the color tone of the paint color of the moving object is reported.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram of a color tone measuring device applied to a continuous coating steel plate line. A strip 1 is flowing through a continuous coating steel sheet line at a line speed of, for example, 0 to 80 mp-. In this line, a coater 2 is placed after the pretreatment process, and then an oven 3 is placed. The coater 2 is equipped with two sets of coating rolls for coating the strip 1 with different colors, and one of the coating rolls is in contact with the strip 1. Oven 3 is for heating strip 1;
It consists of a prime oven and a finish oven. A priddle roll 4 is placed next to the oven 3, and an emission spectrometer 5 is placed next to the looper 4. Note that 6 to 9 are rolls.

The emission spectrometer 5 has a function of causing a light source to emit light at a predetermined period, receiving reflected light from the strip 1, and outputting spectral distribution data of the received reflected light. Further, the emission spectrometer 5 is moved above the calibration plate 11 by the retract mechanism 10 when the calibration time comes. The spectral distribution data output from the emission spectrometer 5 is sent to the color tone calculation device 20.

This color tone calculation device 20 has the function of measuring the color tone of the color coated on the strip 1 in response to spectral distribution data, and has the following configuration. A main control section 21 is provided, and the main control section 21 operates a transmitting/receiving section 22, a tristimulus value calculation section 23, a chromaticity calculation section 24, a color difference calculation section 25, and an unpainted determination section 26. Further, a memory 27 and a display device 28 are connected to the main control section 21. The transmitting/receiving section 22 has a function of controlling the emission interval of the light source of the emission spectrometer 5 and receiving spectral distribution data. The tristimulus i calculation unit 23 calculates the red (X), green (Y) and *<
It has a function of calculating and finding the tristimulus values of 2>. Tristimulus value X.

According to one example, Y and Z are expressed by the following formula.

X-Kf'sCλ)・ρ(λ)・x(λ)dλY-KJ
'''S(λ)・p(λ)・y(λ)dλZ−KJ”s
(λ)・ρ(λ)・z(λ)dλ Here, S(λ) is the branching distribution of the light source, p(λ) is the spectral reflectance of strip 1,
S(λ)・p(λ) is the distribution of reflected light, X(λ), y(λ
), 2(λ) are color matching functions. Integral range is 380n
m to 780 nm. Moreover, the coefficient is expressed by the following formula.

K -100/, f' s (λ)・y(λ)dλ8
0 Next, the chromaticity calculation unit 24 has a function of converting color into numerical values using the tristimulus values x, y, and z obtained by the tristimulus value calculation unit 23. Specifically, the brightness and chromaticity a and b are calculated. - According to the example, these brightness values are one chromaticity a, b
is determined by the following formula.

L= 118(Y/Yn)''-16a=
500 [(X/X n )"'(Y/Yn) "'
] b -200[(Y/Yn)''(Z/Zn)
”3] However, X / X n, Y / Y n, Z
/ Z n are all greater than 0.008856, and Xn, Yn, and Zn are the same as the object surface with tristimulus values x, y, and z - tristimulus values of a completely diffused surface under illumination, usually Yn-1
It is standardized to 00. By the way, the chromaticities a and b are the fifth
As shown in the positional relationship between brightness and chromaticity in the figure, each is divided into + and -. On the + side, the larger the value, the greater the degree of red, and on the - side, the larger the value, the greater the degree of green. . Moreover, when b is on the + side, the degree of yellow becomes large, and when b is on the - side, the degree of blue becomes large.

On the other hand, when the value of L is close to 100, the color is white, and when the value of L is close to 0, the color is black.

The color difference calculation unit 25 has a function of determining the color difference between the strip 1 and the reference color data from the brightness and chromaticity a and b. Here, tanθ-b/a corresponds to the hue, and (a'' + b') corresponds to the saturation.The color difference is the distance between strip 1 and the reference color data (Δa2+Δb2), and the distance between strip 1 and the reference color data. Since there is a brightness difference ΔL, (Δa2+Δb2+Δ1,2) is obtained, and this is used as ΔE to express the color difference between the strip 1 and the reference color data.

The unpainted determination unit 26 has a function of comparing the color difference obtained by the color difference calculation unit 25 with the color difference of a preset unpainted strip l to determine an unpainted portion.

On the other hand, a retract control and control circuit 30 is provided, and a calibration time and a tracking signal are input to this retract control circuit 30, and a calibration control signal R is sent to the retract mechanism 10. It is designed to send and receive signals.

The tracking signal indicates that the coating color has been switched in the coater 2, the welded portion of the strip 1, and the timing of trial coating. Therefore, the retract control circuit 30 sends a calibration control signal R to the retract mechanism 10 according to the calibration time, and sends an operation control signal to the coater machine switching circuit 32 and the trial coating processing circuit 33 through the external manual processing circuit 31 based on the tracking signal. It becomes.

The coater machine switching circuit 32 has a function of notifying the reference color selection circuit 34 when the coating color is switched in the coater 2 in response to an operation control signal.

A reference color memory 35 and a paint color order memory 36 are connected to this reference color selection circuit 34. The reference color memory 35 stores the brightness and chromaticity a and b, which serve as standards for various colors, and the paint color order memory 36 stores the order of the paint colors of the strip 1. Therefore, the reference color selection circuit 3
4 receives the switching signal from the coater machine switching circuit 32, recognizes the next color to be painted from the painting color order memory 36, reads out the reference color data of this color from the reference color memory 35, and sends it to the color difference calculation section 25. Become something.

Further, the trial coating processing circuit 33 has a function of receiving an operation control signal from the external input processing circuit 31 and controlling the emission interval of the emission spectrometer 5 to be shortened through the measurement interval control circuit 37 and the transmitting/receiving section 22 during trial coating. It is something. Note that the operation of the emission spectrometer 5 is controlled by a detector control circuit 38.

Next, the operation of the apparatus configured as described above will be explained.

After pretreatment, the strip 1 is coated with a desired color in a coater 2. This coated strip 1 is heated in an opening 3 and then flows through a priddle roll 4 to an emission spectrometer 5.

In this state, the light emission spectrometer 5 emits light from a light source at predetermined intervals, irradiates the strip 1 with the light, receives reflected light from the strip 1, and calculates and outputs spectral distribution data. This spectral distribution data is then sent to the color tone calculation device 20.
sent to.

In this color tone calculation device 20, spectral distribution data is inputted by the transmitting/receiving section 22 and stored in the memory 27.

When the spectral distribution data is thus stored in the memory 27, the main control section 21 operates the tristimulus value expansion section 23.

This tristimulus value calculation unit 23 calculates the above formula from the spectral distribution data to calculate the red (X), &1 (
Y) and blue (Z) tristimulus values are calculated and determined. Next, the chromaticity calculation unit 24 uses the tristimulus values x, y, and z obtained by the tristimulus value calculation unit 23 to calculate brightness and chromaticity a and b. Next, the color difference calculation unit 25 calculates the color difference between the strip 1 and the reference color data from the brightness and chromaticity a and b. Thus,
This color difference is sent to the display device 28 and displayed under the control of the main control section 21.

When the coating color is switched in the coater 2 in this state, this switching is notified to the retract control circuit 30 by a tracking signal. At this time, the cut tract control circuit 30 sends a message to the reference color selection circuit 3 through the coater machine switching circuit 32 to change the paint color through the external manual processing circuit 31.
Send to 4.

When this reference color selection circuit 34 receives the switching signal, it recognizes the next color to be painted from the painting color order memory 36 and transfers the reference color data (brightness and chromaticity a, b) of this color to the reference color memory 36.
5 and sends it to the color difference calculation section 25. This results in
The color difference calculation unit 25 calculates the brightness and chromaticity a obtained from the reflected light of the strip 1.

b and the changed reference color data, brightness and chromaticity a,
Find the color difference from b. In this way, even if the paint color is changed, the paint color can be continuously measured.

Also, when the paint color is changed, the strip 1 loses its unpainted portion. Therefore, the color difference calculation unit 25 calculates the brightness and chromaticity a from the spectral distribution data when the unpainted part passes under the emission spectrometer 5.

b is determined, and then the color difference from the reference color data is determined.

The obtained color difference is sent to the unpainted determining section 26, and the unpainted determining section 26 compares it with a preset color difference of the unpainted strip 1 to determine the unpainted portion. This prevents false alarms from being issued due to unpainted parts when switching paint colors.

Further, when a tracking signal indicating trial painting is manually input to the retract control circuit 30, the retract control circuit 30 sends an operation control signal to the trial painting processing circuit 33 through the external manual processing circuit 31.

When this trial coating processing circuit 33 receives an operation control signal, it controls the emission interval of the emission spectrometer 5 to be shortened through the measurement interval control circuit 37 and the transmitting/receiving section 22 during trial coating. As a result, the emission spectrometer 5 outputs spectral distribution data at relatively short intervals. Therefore, the color difference calculation unit 25 calculates the color difference in a short time.

Next, when the calibration time manually input to the retract control circuit 30 comes, the retract control circuit 30 sends a calibration control signal R to the retract mechanism 10. Thereby, the retracting mechanism 10 moves the emission spectrometer 5 and places it above the calibration plate 11. In this state, the emission spectrometer 5 receives reflected light from the calibration plate 11 due to light emission from the light source, obtains and outputs spectral distribution data. The color tone calculation device 20 inputs the spectral distribution data and calculates tristimulus values.

Brightness and chromaticity a and b are determined using Y and Z.

Then, the color tone calculation device 20 calculates brightness and chromaticity a.

The color difference from the reference color data of the calibration plate 11 is determined from b, and this color difference is sent to the display device 28 and displayed.

Further, when a tracking signal indicating the welded portion of the strip 1 is inputted to the retract control circuit 30, the retract control circuit 30 sends a retraction control signal to the retract mechanism 10. As a result, the retract mechanism 10 moves the emission spectrometer 5 away from the strip 1 when the welded portion passes toward the side of the emission spectrometer 5.

By the way, the color difference calculating section 25 stores the color difference when the measurement of the coating color of the strip 1 is started, calculates the difference from the color difference that will be submerged thereafter, and displays it on the display device 28. This results in
Changes in color from the start of painting are monitored.

In this way, in the above embodiment, by switching the paint color to the strip 1, the reference color memory 3 is stored in accordance with the paint color order.
The color difference obtained from the spectral data from the emission spectrometer 5 is compared with the reference color data read from the light emission spectrometer 5, and the color tone of the coating color of the strip 1 is displayed, so that the coating color of the strip 1 is switched. The color difference can also be continuously and automatically determined, and unpainted areas can be reliably determined at this time. Also, calibration can be performed automatically.

As a result, the burden on the operator during paint color switching and calibration can be reduced, resulting in labor savings.

Furthermore, since the light emitting interval of the light source of the luminescence spectrometer 5 is shortened during trial coating, the result of the trial coating can be known immediately.Furthermore, since the luminous interval is shortened only during the trial coating,
Trial coating can be minimized and the life of the emission spectrometer 5 can be extended to the maximum. From the above, the yield of the continuous coating steel plate line can be improved.

Note that the present invention is not limited to the above-mentioned embodiment, and may be modified without departing from the spirit thereof.

(Effects of the Invention) As detailed above, according to the present invention, even when the paint color is changed, the color tone JP1 of the paint color can be continuously measured.
We can provide fixed equipment.

Further, according to the present invention, it is possible to provide a color tone measuring device that can continue to measure the tone of a painted color even when the painted color is switched, and can also determine an unpainted portion.

Further, according to the present invention, it is possible to provide a color tone #1 fixing device that can continuously measure the color tone of a paint color even when the paint color is changed, and can automatically calibrate the color tone.

Further, according to the present invention, it is possible to provide a color tone measuring device that can continue to measure the tone of a paint color even when the paint color is changed, and can also handle trial coating.

[Brief explanation of drawings]

1 to 5 are diagrams for explaining one embodiment of the color tone measuring device according to the present invention, in which FIG. 1 is a configuration diagram, and FIGS. 2 to 4 are diagrams showing tristimulus values. , Fig. 5 is a schematic % formula showing the positional relationship of brightness and chromaticity. 4...Pridle roll, 5...Emission spectrometer, 10
... Retract mechanism, 11... Calibration plate, 20...
Color tone calculation device, 21... Main control unit 21. 22... Transmission/reception unit, 23... Tristimulus value calculation unit, 24... Chromaticity calculation unit, 25... Color difference calculation unit, 26...・Unpainted determination unit, 27...Memory 27.28...Display device, 30.
... Retract control circuit, 31... External manual processing circuit, 32... Coater machine switching circuit, 33... Trial coating processing circuit, 34... Reference color selection circuit, 35... Reference color memory, 36... Paint color order memory, 37... Measurement interval control circuit, 38... Detector control circuit.

Claims (5)

[Claims] (1) A color tone measurement device that measures the color tone of a moving object whose paint color is changed, including a spectrometer that receives reflected light from the moving object and outputs spectral data, and a reference color for the color to be painted on the moving object. A reference color memory that stores a plurality of data, and data related to a color tone obtained from the reference color data read from the reference color memory and spectral data from the spectrometer in response to switching of the paint color for the traveling object. A color tone measuring device comprising: color tone calculation means for comparing and reporting the tone of the paint color of the traveling object. (2) A color tone measurement device that measures the color tone of a moving object whose paint color is changed, including a spectrometer that receives reflected light from the moving object and outputs spectral data, and a reference color for the color to be painted on the moving object. A reference color memory that stores a plurality of data, and data related to a color tone obtained from the reference color data read from the reference color memory and spectral data from the spectrometer in response to switching of the paint color for the traveling object. a color tone calculation means for comparing and informing the color tone of the painted color of the traveling object; and a color tone calculation means for comparing the color tone obtained by the color tone calculation means with preset data regarding the color tone of the unpainted traveling object to determine the color of the unpainted portion. 1. A color tone measurement device characterized by comprising: unpainted determination means for determining. (3) A color tone measurement device that measures the color tone of a moving object whose paint color is changed, including a spectrometer that receives reflected light from the moving object and outputs spectral data, and a reference color for the color to be painted on the moving object. a reference color memory storing a plurality of data, a calibration plate coated with a predetermined color, and a calibration means for placing the spectrometer above the calibration plate when calibration time comes;
The reference color data read out from the reference color memory in accordance with the paint color applied to the moving object and the switching of the calibration plate is compared with the data regarding the color tone obtained from the spectral data from the spectrometer, and the color tone of the moving object is determined. 1. A color tone measuring device comprising: a color tone calculation means for reporting the tone of a paint color. (4) A color tone measurement device that measures the color tone of a moving object whose paint color is switched, including a spectrometer that receives reflected light from the moving object and outputs spectral data, and a reference color for the color to be painted on the moving object. a reference color memory storing a plurality of data; a trial coating processing means for shortening the detection interval of the spectrometer when trial coating the moving object; and color tone calculation means that compares the reference color data read from the reference color memory with data regarding the color tone obtained from the spectral data from the spectrometer to report the tone of the paint color of the traveling object. A color tone measurement device featuring: (5) A color tone measurement device that measures the color tone of a moving object whose paint color is changed, including a spectrometer that receives reflected light from the moving object and outputs spectral data, and a reference color for the color to be painted on the moving object. a reference color memory storing a plurality of data, a calibration plate coated with a predetermined color, and a calibration means for placing the spectrometer above the calibration plate when calibration time comes;
trial coating processing means for shortening the detection interval of the spectrometer when trial coating the moving object; and reading from the reference color memory in response to the trial coating on the moving object, switching of the paint color and the calibration plate. a color tone calculation means for notifying the color tone of the paint color of the traveling object by comparing the output reference color data with data regarding the color tone determined from the spectral data from the spectroscope; and a color tone determined by the color tone calculation means. and unpainted determination means for determining an unpainted portion by comparing the color tone of the unpainted traveling object with preset data regarding the color tone of the unpainted traveling object.