JP2001318000A - Method of judging toning end point - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repairing painting method which eliminates personal errors in repairing painting of a paint film having a brightness feeling, preventing a toning person who is less experienced in toning, from hesitating in judging the toning end point. SOLUTION: The toning end point judging method comprises presetting the toning end point allowable range in each angle condition from angle reference color values, obtained by measuring a reference color having a bright feeling for adjusting paint colors in two or more angle conditions, using a multi-angle color meter, judging whether each color measured value of a toning passed paint board is within the color end point allowable range, using a computer, presetting the brightness feeling end point allowable range from micro brightness feeling reference values obtained by measuring the reference color, using a micro brightness feeling meter, judging whether the micro brightness feeling reference measured values of the toning passed paint board are within the brightness feeling end point allowable range, using the computer, and determining that the toning end point is reached, if it is judged that each color measured value and the micro brightness feeling measured values of the toning passed paint board are within the end point allowable ranges.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-angle colorimeter and a method for determining the end point of toning using a micro-brightness measuring instrument in the toning of a paint having a glitter for repair painting.

[0002]

2. Description of the Related Art Conventionally, in the field of repair painting such as automobile repair painting, the paint color of a progress paint plate coated with a toning candidate paint is compared with a reference color near a repair paint portion of an actual vehicle. Then, the toning person judges whether the paint color is acceptable or unacceptable, and if it is judged to be unacceptable, further corrects the paint color, and again makes a passing painted board until it judges that it is acceptable The toning of the repair paint was repeatedly performed. At the time of this toning, toning of the repair paint using a colorimeter was also performed.

However, in this method, the toner judges the end point of the toning of the repair paint, and there is an individual difference.
Further, in recent years, the color of the paint has also become more complicated, and there has been a problem that a toner who has little toning experience is confused in determining the toning end point.

[0004] An object of the present invention is to provide a computer with which a toning person who has little toning experience in repair painting can avoid losing judgment on the toning end point and eliminate individual differences in determining the toning end point. An object of the present invention is to provide a method for determining a toning end point.

[0005]

Means for Solving the Problems The present inventors previously set a color end point allowable range from a color measurement value of a reference color having glitter under two or more angle conditions using a multi-angle colorimeter. The color measurement value of the coated plate of the toning paint is within the color end point allowable range, and the glitter end point allowable range from the micro glitter reference measurement value obtained by measuring the reference color with a micro glitter meter is set in advance. The inventors have found that the above object can be achieved by setting the toning end point when the measured value of the micro glitter of the coated plate of the toning paint falls within the allowable range of the glitter end point, and completed the present invention.

That is, according to the present invention, each color measurement value (angle reference) obtained by measuring a reference color having a brilliant sensation to be matched with the paint color by toning under two or more angle conditions using a multi-angle colorimeter. The color end point allowable range for each angle condition from (color measurement value) is set in advance, and it is determined whether or not each color measured value of the toned coating plate is within the color end point allowable range for all of the angle conditions. Judgment is made by a computer, and the reference end color is set in advance to an allowable range of the glitter end point from the micro glitter reference measurement value measured by the micro glitter meter. Is determined by the computer whether or not is within the glitter end point allowable range,
It is the toning end point when it is determined that each measured value of the color of the toned coated plate is within the color end point allowable range and the measured value of the micro glitter of the toned coated plate is within the glitter end point allowable range. It is intended to provide a toning end point determination method characterized by determining

Further, the present invention further provides an angle reference color measurement value and a micro glitter measurement value at each angle condition of the reference color,
Correct the paint composition by using the color measurement values and micro-brightness measurement values at each angle of the toning progress coated plate, and color matching calculation logic using the color characteristic data and micro-brightness characteristic data of multiple primary color paints. To obtain a corrected paint composition that is even closer to the reference color.

Further, the present invention provides the above-mentioned method for judging the toning end point, wherein the corrected paint composition is transmitted to an electronic balance.

Hereinafter, the toning end point determining method of the present invention will be described in detail.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a multi-angle colorimeter and a micro-brightness measuring instrument are used to adjust a paint color to be applied to a paint having luster to be used for repair painting. Measured by In the repair coating, when the toned paint is applied to form a coating film, it is necessary that the difference between the coating film in the repair coating part and the color of the coating film in the vicinity of the repair coating part is difficult to be visually recognized. , As the reference colors,
Normally, it is preferable that the color be the color of the coating film surface near the repair coating portion.

According to the method of the present invention, the toning is suitably performed in the case where the coating film to be coated with the coating color by toning is a coating film having a brilliant feeling (hereinafter sometimes referred to as a "shining coating film"). be able to. Examples of the glitter coating include, for example, a single-layer coating containing a glitter pigment having a glittering or interference effect, such as flake-like aluminum powder, mica-like iron oxide, mica powder, and metal oxide-coated mica powder. (1) a single-layer coating film (2) containing the glitter pigment and the coloring pigment in the same coating film, and a clear coating film on the single-layer coating film (1) or (2) Coating (3)
And the like.

In order to measure the reference color with a multi-angle colorimeter, two or more angle conditions, that is, different angles of incidence of the measuring light or a light receiving angle which is an angle between the specular reflection axis and the light receiving axis are required. It is measured under two or more different conditions. The specular reflection axis is an axis that forms a reflection angle when the incident angle and the reflection angle are the same angle. For example, when the incident angle is 45 degrees, the reflection angle is 45 degrees.

When the light receiving angle is changed, the angle condition is not particularly limited.
In the case of the above, the light receiving angles are 15 to 30 degrees and 75 to 1
When the angle condition is 3, the light receiving angle is 15 to 3
0 degree, 35 degrees to 60 degrees, and 75 degrees to 110 degrees, respectively, and when the angle condition is 4, the light receiving angle is 15 degrees to 30 degrees, and 35 degrees to 60 degrees. ,
It is preferable that each of the angle ranges of 70 to 80 degrees and 90 to 110 degrees is one because it is easy to correspond to the color judgment by visual observation.

Each measurement value (angle reference measurement value) obtained by measuring the above reference color under each angle condition may be any value that can specify a color, such as representing or calculating lightness, saturation, and hue. XYZ color system (X, Y, Z), L ^* a ^* b
^* Color system (L ^* , a ^* , b ^* value), Hunter Lab color system (L, a, b value), L ^* C ^* h color system (L ^* value) defined by CIE (1994) , C ^* value, h value), Munsell color system (H, V, C). Above all, the display using the L ^* a ^* b ^* color system or the L ^* C ^* h color system is common in the display of colors in the industrial field including the automobile repair coating field.

In the present invention, the allowable range of the toning end point in each angle condition from the angle reference measurement value measured under each angle condition of the reference color is set in advance. The toning end point allowable range can be determined by setting an allowable width according to the color of the reference color. The permissible width is, for example, a large number of areas that a veteran toned person visually judges to be acceptable are measured under various angle conditions with a multi-angle colorimeter, and can be determined from the measured values. It may be determined by a method. When the colors of the reference colors are similar, they can be set to the same allowable width.

In the L ^* a ^* b ^* color system, generally, for a high brightness color, the allowable range of the ΔL ^* value is large, but the allowable ranges of the Δa ^* value and the Δb ^* value are small. Tend. Further, for a low brightness coating film, Δa ^*
Values and Δb ^* values tend to be large.

Similarly, looking at the L ^* C ^* h color system, generally, for a high brightness color, the allowable range of the ΔL ^* value is large, but the allowable ranges of the ΔC ^* value and the ΔH ^* value are as follows. Tends to be smaller. In addition, with respect to a low-brightness coating film, the allowable range of the ΔC ^* value and ΔH ^* value tends to be large.

The allowable range of the toning end point is, for example, ΔL ^* , Δ
a ^* , Δb ^* and ΔE ^* values, or ΔL ^* , ΔC ^* , ΔH ^*
And ΔE ^* (hereinafter referred to as “ΔE ^*
₉₄ )), and these values are set for each angle condition, and the ΔL ^* , Δa ^* , Δb ^* and ΔE ^* values set for each angle condition, or ΔL ^{*
*, ΔC *,} it is necessary to toning to be within the scope of the respective values of [Delta] H ^* and Delta] E ^* ₉₄ value. Further, the toning end point allowable range can be expressed only by the ΔE ^* value or the ΔE ^* ₉₄ value.

ΔE of color end point allowable range^* Value is color end point tolerance
ΔL set as range^* , Δa ^* , Δb^* Value of
From the following equation, ｛(ΔL^* )^Two + (Δa^* )^Two + (Δb^* )^Two ｝^1/2 Is set to a value less than or equal to the value represented by

The ΔE ^* ₉₄ value of the color end point allowable range is obtained from the values of ΔL ^* , ΔC ^* , and ΔH ^* set as the toning end point allowable range by the following formula: ｛(ΔL ^* / S _L ) ² + (ΔC ^* ) / S _C ) ² + (ΔH ^* /
S _H ) ² ｝ ^1/2 (where S _L = 1, S _C = 1 + 0.045C ^* , S _H
= 1 + 0.15C ^* . ).

In the method of the present invention, a progress coated plate coated with a paint toned to a color close to the reference color is measured by a multi-angle colorimeter under two or more angle conditions, and the color measurement value is measured. It is determined by the computer whether or not is within the color end point allowable range.

In the method of the present invention, micro glitter is measured together with color measurement by a multi-angle colorimeter. The micro-brightness measuring device is a device for measuring the micro-brightness of a brilliant coating film, and can be used without any particular limitation as long as it can achieve this purpose.

Examples of the micro-brightness measuring device include a light irradiating device for irradiating light to the surface of a brilliant coating film, and a CCD for taking an image of the irradiating coating film at an angle where irradiation light does not enter to form an image. Examples include a camera and a micro-brightness measuring instrument equipped with an image analyzer connected to the CCD camera and analyzing the image.

In order to measure the micro glitter of a glitter coating using the micro glitter meter, first, the surface of the glitter coating is irradiated with light. This light is preferably simulated (artificial) sunlight, and a suitable light source is, for example, a halogen lamp or a metal halide lamp. The light irradiation angle on the bright coating surface is usually 5 to 60 degrees, preferably 1 to 60 degrees, based on the vertical line of the coating surface.
A range of 0 to 20 degrees is suitable, and particularly about 15 degrees with respect to a vertical line. Further, the shape of the light irradiation area is not particularly limited, but is usually a circle, and the irradiation area on the coating film surface is usually 1 to 10 of the coating film surface.
A range of 000 mm ² is suitable, but is not limited to this range. The illuminance of the irradiation light is usually 100 to
Preferably within the range of 2,000 lux.

As described above, the surface of the bright coating is irradiated with light, and among the reflected light based on the light, the surface of the coating which has been irradiated with light at an angle at which specular reflection does not enter the CCD (Charge Cou).
(Ple Device) camera. The photographing angle may be any angle at which specularly reflected light does not enter, but is particularly preferably perpendicular to the coating film surface. Further, the angle between the shooting direction of the CCD camera and the specularly reflected light is preferably in the range of 10 to 60 degrees. The measurement range of the light-irradiated coating film surface with a CCD camera is not particularly limited as long as it is a range where light is uniformly irradiated.
Including the central part of the irradiated part, the measurement area is 1 to 10,000
Suitably it is in the range of mm2, preferably 10-600 mm2.

The image photographed by the CCD camera is 2
Dimensional image, many (usually 10,000 to 1,000
000) sections (pixels, pixels)
Measure the brightness in each section. In the present invention, “brightness” means “a digital gray scale indicating a gradation value of each section of a two-dimensional image obtained by photographing with a CCD camera, and a digital amount corresponding to the brightness of a subject”. . For example, a digital gray scale meaning luminance for each section output from an 8-bit resolution CCD camera is 0 to 25.
5 is shown.

In the two-dimensional image photographed by the CCD camera, the section corresponding to the portion where the glittering pigment has a strong reflected light has a high brightness since the glittering feeling is strong. Lower. Even in a section corresponding to a portion where reflected light from the glittering pigment is strong, the luminance changes depending on the size, shape, angle, material, and the like of the glittering pigment. In other words, the brightness can be displayed for each section, and in the present invention, C is calculated based on the brightness in each section.
It is possible to three-dimensionally display the luminance distribution of a two-dimensional image captured by a CD camera. The three-dimensional distribution map of the luminance is divided into peaks, valleys, and flat areas, and the height and size of the peaks indicate the degree of glitter due to the brilliant pigment. And the valleys and flat areas show no or little glitter, and mainly show the reflection of light by the colored pigment or the substrate.

The analysis of the image captured by the CCD camera can be performed by an image analyzer connected to the CCD camera. As image analysis software used in this image analysis apparatus, for example, “Mac” of Mitani Shoji Co., Ltd.
SCOPE ”(product name) and the like are preferable.

In the analysis of images, "glittering"
(Perception of irregular and fine shine caused by light specularly reflected from the brilliant pigment in the coating film) and "granularity" (brightness is observed when the sample is observed under lighting conditions where glitter is difficult to develop as much as possible). Quantitative evaluation of the glittering pigments in the coating material-containing coating and the perception generated from random / non-directional patterns (random patterns) caused by the orientation / overlapping of the pigments separately requires little variation due to individual differences. Is preferred.

As a preferable method for quantitatively measuring the glitter, the following measurement method can be exemplified. A two-dimensional image obtained by photographing the illuminated coated film surface with a CCD camera is divided into a number of sections, and the brightness of each section is summed over all of the sections to obtain a total value. The value is divided by the total number of sections to obtain an average luminance x, and a threshold α is set to a value equal to or higher than the average luminance x. The threshold α is usually the average luminance x and y (y is a number of 24 to 40,
Preferably, the sum is 28 to 36, more preferably 32).

Next, the value of the threshold value α is subtracted from the luminance of each of the sections, and the subtracted values whose subtracted values are positive values are totaled to obtain a total volume V which is the sum of the subtracted values. In addition, the total number of sections having a luminance equal to or more than the threshold α (the total number of sections having the threshold α or more obtained by performing binarization with the threshold α)
Is obtained. Average height PHav of luminance peak
Since it is considered that the luminance peak can be approximated to a cone or a pyramid, α is set to a value obtained by dividing the value obtained by dividing the total volume V by the total area S, ie, a value obtained by the following equation: PHavα = 3V / S.

Further, a threshold value β which is not less than the average luminance x and not more than the threshold value α is set. The threshold value β is equal to or less than the threshold value α, and is generally equal to the average luminance x and z (z is a number of 16 to 32,
Preferably, the sum is 20 to 28, more preferably 24).

Next, the value of the threshold value β is subtracted from each of the luminance values of the sections, and the subtracted values whose subtracted values are positive values are totaled to obtain a total volume W which is the sum of the subtracted values. Also, the total number of sections having a luminance equal to or greater than the threshold β (total number of sections equal to or greater than the threshold β obtained by performing binarization with the threshold β)
Is obtained. The average height PHavβ of the luminance peak at the threshold β is considered to be three times the value obtained by dividing the total volume W by the total area A, since the luminance peak can be approximated to a cone or a pyramid, that is, the following expression PHavβ = It can be a value obtained by 3W / A.

Further, the average particle area of the optical particles can be determined from the total area A at the threshold value β and the number C of the optical particles exhibiting a luminance equal to or higher than the threshold value β. In the present invention, “optical particles” means “independent continuum whose luminance is equal to or higher than a threshold on a two-dimensional image”. Assuming that the shape of the optical particles is a circle, the diameter D of a circle having the same area as the average particle area is represented by the following equation.

[0035]

(Equation 1)

From the above-mentioned PHavβ and L, the average skirt spread rate PSav of the luminance peak is obtained by the following equation: PSav = D / PHavβ.

The brightness value BV is calculated from the brightness peak average height PHavα obtained as described above and the brightness skirt spread rate PSav obtained as described above as follows: BV = PHavα + a · PSav (where , A is 300 if PHavα is less than 25
When PHavα exceeds 45, it is 1050, and when PHavα is a number of 25 to 45, it is a value represented by the following equation: a = 300 + 37.5 × (PHavα−25) Can be calculated.

In the preferred method of the present invention, the “glitter” of the glittering coating film can be quantitatively measured by the glitter value BV determined as described above, and the glitter value BV and the “glitter” by visual observation can be measured. The correlation between the “feel” and the sensory evaluation result is high even when the difference in the concentration of the glittering material and the difference in brightness in the coating film are large.

Next, a preferred method for quantitatively measuring the “particle feeling” will be described. As described above, the method for quantitatively measuring the particle feeling is as follows.
A two-dimensional power spectrum obtained by photographing with a D camera to obtain a two-dimensional image, integrating the power of low spatial frequency components from the spatial frequency spectrum obtained by performing two-dimensional Fourier transform on the two-dimensional image, and normalizing the power with a DC component. Integral value (hereinafter,
This is a method of quantitatively evaluating the graininess of the coating film from the integrated value of the two-dimensional power spectrum.

When the low spatial frequency component is extracted from the spatial frequency spectrum image after the two-dimensional Fourier transform, and the integral value and the normalization with the DC component are measured, the integral value of the two-dimensional power spectrum is measured. The extraction region of the low spatial frequency component to be extracted from the spectrum image is a region in which the linear density representing the resolution is a numerical value in a range of a lower limit of 0 lines / mm to an upper limit of 2 to 13.4 lines / mm. It is preferable to set the area to preferably 0 / 4.4 to 4.4 / mm from the viewpoint of increasing the correlation with the sensory evaluation result of “particle feeling” by visual observation.

The IPSL can be obtained by the following equation.

[0042]

(Equation 2)

(Where ν is the spatial frequency, θ is the angle, P is the power spectrum, 0-L is the extracted low spatial frequency region, and L is the upper limit of the extracted frequency.) The “glitter” can also be evaluated based on the value of MBV calculated by the following linear equation based on the value BV.

MBV = (BV−50) / 2 The value of MBV is a value that is 0 when there is no glitter and almost 100 when the glitter is the most.
The larger the “glitter”, the larger the value.

An MGR calculated by the following linear equation based on the two-dimensional power spectrum integrated value (IPSL):
The "particle feeling" can also be evaluated by the value of. IPS
When the value of L is 0.32 or more, MGR = [(IPSL
× 1000) −285] / 2, and when the value of the IPSL is in the range of 0.15 <IPSL <0.32, MGR = [IPSL × (35 / 0.17) − (525 /
17)] / 2, and when the IPSL value is 0.15 or less, MG
Let R = 0.

The value of the above MGR is set to 0 when there is no graininess of the glittering material, and is set to about 100 when the glittering material currently used in the paint field has the most graininess. Those with a “grain feeling” show larger values.

Further, the micro-brightness is evaluated by a numerical value (micro-brightness index) obtained by indexing the micro-brightness calculated by the following equation, which expresses the micro-brightness comprehensively based on the values of MBV and MGR. I can do it. Micro glitter index = (MGR + α · MBV) / (1+
α) After examining painted boards with many glitters,
When the value of α was 1.63, it was found that a result that was in good agreement with the visual micro-brightness was obtained. The value is 0 when there is no micro glitter (no glitter or grain), and almost 100 when the glitter is the most (the most glitter or grain).

In the method of the present invention, a reference color having a glitter is measured by a micro glitter measuring instrument to obtain a micro glitter reference measurement value. A glitter end point allowable range from the micro glitter reference measurement value is set in advance. The allowable range of the glitter end point can be set according to the micro glitter of the reference color. The permissible width can be determined based on a difference from a micro-brightness reference measurement value, for example, by measuring a large number of regions visually determined by a veteran toner as a pass with a micro-brightness measurement device. May be determined by other methods. When the reference colors have similar micro-brightness, they can have the same allowable width. It is preferable that the micro glitter reference measurement value is divided into the “glitter feeling” and the “particle feeling” and an allowable range from the reference measurement value is set for each of them.

In the method of the present invention, the measured value of the micro-brightness reference value measured by a micro-brightness measurement device is set within the permissible range of the glitter end point. It is determined by the computer whether there is any.

Further, when it is determined that the measured values of each color in the toned coated plate are within the allowable range of the color end point, and the measured values of the micro-brightness of the toned coated plate are within the allowable range of the glitter end point, the toning is performed. Judge as the end point. If it is determined that the toning end point has been reached, the
May be displayed.

As an example of the allowable range of the toning end point, the following values can be given as examples of the case where the measurement is performed at three light receiving angles and the measured values of the micro glitter.

[0052]

[Table 1]

Since the allowable range of the toning end point also varies depending on the repair painting position and the like, the allowable range of the toning end point determined according to the color of the reference color is set as the allowable range of the toning end point. May be performed.

The toning end point allowable candidate range can be, for example, an allowable width when the color of the coating film is viewed under the condition of a vertical plane with respect to the reference color.

The factor of the above-mentioned repair painting portion includes whether the repair painting portion is a vertical portion or a horizontal portion. When the repair coating portion is the vertical portion, the allowable range of the toning end point can be expanded as compared with the horizontal portion.

In the present invention, at least one of the measured value of each color and the measured value of the micro-brightness of the toned progress coated plate coated with the paint toned to be a color close to the reference color is within the allowable range of the end point. If not, the toning is repeated until the toning end point is within the allowable range. In this toning, the color of the paint and the amount of each primary color paint required to correct the glitter are calculated by a computer from the difference between the measured values of the reference color and the elapsed paint plate, and the color of the paint is calculated based on that. It is preferable to correct the glitter. Instead of using a computer, the color can be adjusted based on human experience and intuition.

In the toning by the computer for the above correction, the measured value of the angle reference color and the measured value of the micro-brightness at each angle condition of the reference color, the measured value of the color at each angle of the toned coating plate and the measured value of the micro-brightness Using the measured values and the color matching calculation logic using the color characteristic data of the plurality of primary color paints and the micro-brightness characteristic data, the paint composition can be modified to obtain a modified paint composition that is closer to the reference color.

In the present invention, the primary color paint is not only a primary color paint containing a color pigment, a glitter material primary color containing aluminum powder or pearl mica powder, but also a paint material that affects the appearance of a coating film, for example, An aluminum orientation fine-tuning agent which may contain an extender such as silica fine powder is also included.

The modified paint formulation obtained by the computer toning can be transmitted to an electronic balance via, for example, a telephone line, an optical cable, an electric cord, or the like. The modified paint can be blended using an electronic balance based on the modified paint composition to obtain a modified paint.

Using the obtained modified paint, a toned coating plate is obtained again, and it is determined again whether or not the toned end point is reached. If it is not at the toning end point, the process of making corrections again, creating a corrected paint, obtaining a toning progress coated plate, and determining whether or not it is at the toning end point, until it is determined that the toning end point By doing so, a toning paint for repair can be obtained.

[0061]

The present invention will now be described more specifically with reference to examples. The present invention is not limited to the embodiments.

Apparatus Used and Measuring Method In each of the following examples, the measurement of the reference color for matching the paint color by toning was performed using a multi-angle colorimeter "Van-VanFA sensor" manufactured by Kansai Paint Co., Ltd. The computer in which the color characteristic data and the micro brilliant characteristic data of a plurality of primary color paints are registered, and the color matching calculation logic using the respective paint formulations and the respective data is operated is Kansai Paint Co., Ltd. The computer color matching apparatus "Van-VanFA station" manufactured by the company was carried out. The "Van-VanFA sensor" can obtain a color measurement value by measuring the angle between the specular reflection axis and the light receiving axis under three angle conditions of 25, 45, and 75 degrees. The micro glitter data of the reference color to be adjusted to the coating color of the paint by toning is described in "RD-175" manufactured by Minolta.
CCD with F-macro 100mm F2.8 lens
The illumination was performed with a camera, and the illumination was performed with an optical fiber type halogen light with a condenser lens attached to the tip. The original image data is 512 x 5
After being cut out into digital image data of 12 pixels of monochrome 256 gradations, digital processing was performed by image analysis software.

Example 1 The reference colors of the coating surface of an automobile body are three colors of high brightness silver metallic (silver M1), medium brightness green metallic pearl (green MP), and low brightness blue pearl (blue P). The repair coating was on the vertical surface of the car body.

The measured color values and the measured values of the micro glitter under the three angles of the three reference colors were as shown in Table 2 below.

[0065]

[Table 2]

In the above-mentioned repair coating, the allowable range of the toning end point of the color measurement value and the allowable range of the micro glitter measurement value at each angle condition which are set in advance for these coating colors are as shown in Table 3 below. did.

[0067]

[Table 3]

From the measured values of the three reference colors under the three-angle conditions, the amounts of each primary color paint (paint mix) calculated by the computer color matching apparatus were as follows.

Silver M1 primary color paint type Weight ratio Silver A (metallic primary color A) 41.1 Silver B (metallic primary color B) 35.3 Black A (black primary color A) 0.9 Blue A (blue primary color A) 0.4 Auxiliary A (Aluminum alignment modifier A) 18.8 Auxiliary B (Aluminum alignment modifier B) 3.5 Green MP primary color paint type Weight ratio Blue A (Blue primary color A) 42.0 Green A (Green primary color A) 24.0 Silver C (Metallic primary C) 15.5 Blue B (Blue primary B) 5.0 Pearl A (Pearl primary A) 2.1 Maroon A (Red brown primary A) 1.3 Auxiliary A (Aluminum orientation) Adjusting agent A) 8.4 Auxiliary B (Aluminum alignment adjusting agent B) 1.7 Blue P primary color paint type Weight ratio Black B (Black primary color B) 39.2 Blue C (Blue primary color C) 22.3 Blue D ( Blue primary color D) 19 Created a toning elapsed coated plate at 1 Pearl B (pearl primary color B) 10.5 Pearl C (Pearl primaries C) 8.9 The above coating formulation. L ^* a ^* when measured with the above multi-angle colorimeter under three-angle conditions
b ^{* In the} color system, the measured color values and the measured values of the micro-brightness of the coating film of the toned coated plate from the reference color were as shown in Table 4 below.

[0070]

[Table 4]

The computer color matching apparatus was used to determine whether or not the measured value of each coating color of the toned coated plate was within the preset allowable range of the toning end point. As a result, the measured value of micro glitter was within the allowable range in any of the toned coated plates, but the values of the color measurement values ΔL ^* , Δa ^* , Δb ^* or ΔE ^* were not acceptable for the toning end point. Each primary color required to correct the color of the paint to be toned based on the color measurement value at each angle on the toned coating plate because it was not within the range and was not determined as the toning end point The paint quantity (additional indication quantity) was calculated by a computer color matching device. The additional instruction amount at that time was as follows with respect to 100 parts by weight of the toning paint.

[0072]Silver M1 Primary color paint type parts by weight Black A (black primary color A) 3.9 Auxiliary A (aluminum alignment adjuster A) 0.9 Auxiliary B (aluminum alignment adjuster B) 0.2Green MP Green A (green primary color A) 7.5 Auxiliary A (aluminum alignment modifier A) 0.5 Auxiliary B (aluminum alignment modifier B) 0.9 Yellow A (yellow primary color A) 3Blue P Primary color paint type Weight part Black B (Black primary color B) 17.2 Blue C (Blue primary color C) 7.5 Each toning obtained using the paint corrected for the additional indicated amount
Measure the progress coating plate at each angle condition using a multi-angle colorimeter.
ΔL from the reference color when^* , Δa ^* , Δb
^* And ΔE^* Table 5 below shows the values of
It was as follows.

[0073]

[Table 5]

The measured value of each paint color of each of these toned coated plates
Is within the preset toning end point tolerance range
Is determined by a computer color matching device.
It was decided. As a result, each coating color of the toned coating plate is ΔL
^* , Δa^* , Δb^* And ΔE ^* Value and micro glitter measurement
If any of the values fall within the allowable range of the toning end point
Computer color matching device
Table that is determined to be the toning end point
An indication was made. Therefore, using the final toning paint
Car repair painting was carried out on the car body,
The color of the paint film in the vicinity was judged visually.
Good color consistency was confirmed.

Example 2 The reference color of the coating film surface of the vehicle body was set to low brightness red pearl (red P), and the repair coating portion was set to the horizontal surface of the vehicle body. The measured values of L ^* , a ^* , and b ^{* and} the measured values of micro glitter of the reference colors were as shown in Table 6 below.

[0076]

[Table 6]

In the above-mentioned repair coating, the permissible range of the toning end point of the color measurement value and the permissible range of the micro glitter measurement value at each preset angle condition are as shown in Table 7 below. did.

[0078]

[Table 7]

The amount of each primary color paint (paint composition) calculated by the computer color matching apparatus from the measured values of the reference colors under the three-angle condition was as follows.

Red P primary color paint type Weight ratio Red A (red primary color A) 46.4 Maroon B (red brown primary color B) 29.8 Pearl B (pearl primary color B) 9.9 Red B (red primary color B) 6 Pearl C (Primary primary color C) 6.6 Black D (Black primary color D) 0.7 A toning progress coated plate was prepared using the paint containing the above paint. In the L ^* a ^* b ^* color system, when the measurement was performed with the above-described multi-angle colorimeter under three-angle conditions, ΔL ^* of the color measurement value of the coating film of the toned progress coated plate from the reference color, Δa ^* , Δb
^* And Delta] E ^* is the value and the value of the micro-brilliance measurements Table 8
Was as shown in FIG.

[0081]

[Table 8]

The computer color matching device determines whether the measured color value and the measured value of the micro-brightness of each coating color of each toned coating plate fall within the preset allowable range of the toning end point. Was. As a result, each coating color of the toned coating plate is ΔL ^* , Δa ^* , Δb ^* and ΔE ^*.
And the value of the measured micro-brightness value were within the allowable range of the toning end point, the computer color matching apparatus determined that the toning end point was reached, and displayed that the toning end point was displayed. Was. Therefore, repair painting was carried out on the car body using the final toning paint, and color matching was determined visually for the repair painting part of the car body and the coating film surface in the vicinity, and good color matching was confirmed. did.

[0083]

According to the method of the present invention, in the repair coating of a coating film having a brilliant feeling, a color adjuster with little experience of color matching can perform color matching without hesitating to judge the color matching end point.
In addition, it is possible to eliminate individual differences in the determination of the toning end point.

Claims (8)

[Claims] 1. Each color measurement value (angle reference color measurement value) obtained by measuring a reference color having a brilliant sensation to be matched with a paint color by toning under two or more angle conditions using a multi-angle colorimeter. The color end point allowable range in each angle condition from is set in advance, and it is determined by a computer whether or not each color measurement value of the toned coating plate is within the color end point allowable range in all of the angle conditions. In addition, a glitter end point allowable range from the micro glitter reference measurement value obtained by measuring the reference color with a micro glitter measurement device is set in advance, and the micro glitter measurement value of the toned progress coated plate is determined by the glitter end point. The computer determines whether or not it is within the allowable range, and the measured values of the respective colors of the toned coated plate are within the color end point allowable range, and the measured values of the micro glitter of the toned coated plate are the glitter end point allowable range. Determined to be within A toning end point judging method characterized in that it is sometimes judged that the toning end point is reached. 2. The method according to claim 1, wherein the reference color is a color of a paint film in the vicinity of a repair coating portion of an automobile body. 3. The light receiving angle measured by a multi-angle colorimeter is as follows:
The angle between the specular reflection axis and the light receiving axis is 15 to 30 degrees, 35
1 in each of the angle ranges of -60 degrees and 75-110 degrees
The toning end point determining method according to claim 1 or 2, wherein the total number of received light angles is three. 4. An allowable color end point range for each angle condition is as follows:
ΔL ^* , Δ from angle reference color measurement value at each angle condition
The toning end point determination method according to any one of claims 1 to 3, wherein the method is determined by the values of a ^* , Δb ^*, and ΔE ^* . 5. The color end point allowable range under each angle condition is as follows:
CIE19 from angle reference color measurement value at each angle condition
The toning end point judging method according to any one of claims 1 to 3, wherein the method is determined by values of ΔL ^* , ΔC ^* , ΔH ^*, and ΔE ^* specified in the 94 color difference equation. 6. A light irradiating device for irradiating light to a coating film surface, a CCD camera for forming an image by photographing the light-irradiated coating film surface at an angle at which irradiation light is not incident, and
The toning end point judging method according to any one of claims 1 to 5, further comprising an image analyzer connected to the CCD camera and analyzing the image. 7. An angle reference color measurement value and a micro glitter measurement value at each angle condition of a reference color, a color measurement value and a micro glitter measurement value at each angle of a toned coating plate, and a plurality of primary color paints. 7. A modified paint composition, which is modified by using a color matching calculation logic using the color characteristic data and the micro brilliant characteristic data to obtain a modified paint composition that is closer to the reference color. The toning end point determination method according to any one of the first to third aspects. 8. The method according to claim 7, wherein the correction paint composition is transmitted to an electronic balance.