JP6921286B1 - Mask member for color measuring device, color measuring device, and color measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color measuring device capable of measuring a color more accurately because the color difference from the visual tint is small even if the color measuring object is made of a relatively small size, thick and translucent material. Provided are a mask member for a color measuring device capable of capable, a color measuring device provided with the mask member, and a color measuring method using the color measuring device. SOLUTION: The mask member 10 for a color measuring device is arranged between a color measuring object and a light source, and a window portion 5 optically penetrating in the thickness direction thereof is formed in the center, and is transparent or translucent. Is. Further, the mask member is arranged between the color measurement target and the light source at a position where it abuts on the color measurement target, and the color measurement device is used to measure the color of the color measurement target. It is a color measuring method having a step. [Selection diagram] Fig. 1

Description

The present invention relates to a mask member for a color measuring device, a color measuring device, and a color measuring method.

For various industrial products, etc., in order to ensure a certain level of quality, the color of the product surface is kept the same so that there is no variation between the products. Therefore, it is necessary to measure and manage the color of the product surface using a colorimeter at the manufacturing stage or the like. Such a colorimeter includes, for example, a light source that emits irradiation light that irradiates the surface of a color measurement target such as a product, and a receiver such as a sensor that receives reflected light emitted from the surface of the color measurement target. There is.

The size and shape of the surface of the color measurement target and the color measurement target itself are not always uniform. Then, it is not realistic to prepare different colorimeters according to the color measurement target. Therefore, a colorimeter in which a removable mask member such as a nose cone or a target mask is provided between the color measurement target and the main body has been proposed (see Patent Documents 1 and 2). The mask member is formed with a window portion having an opening smaller than that of the color measurement target according to the size of the color measurement target. Then, when measuring the color of the color measurement target, it is attached to the main body of the colorimeter so as to cover the illumination light receiving portion including the light source and the light receiving portion and to come into contact with the color measurement target.

Special Table 2000-505887 Japanese Unexamined Patent Publication No. 2015-206638

However, even when the surface of the color measurement target is color-measured using the colorimeters proposed in Patent Documents 1 and 2, the difference between the visual color and the color-measured color. (So-called color difference) may occur, and it may be difficult to accurately evaluate the actual color of the color measurement target. In particular, when the size of the color measurement target is small, thick and translucent (for example, when the size is 20 mm or less and the thickness is 1 mm or more), the brightness is measured lower than the visual feeling, and the color difference is large. There was a problem that it tended to grow significantly.

The present invention has been made in view of the problems of the prior art, and the subject thereof is a color measurement object made of a relatively small size, thick and translucent material. However, it is an object of the present invention to provide a mask member for a color measuring device, which has a small color difference from the visual tint and can be a color measuring device capable of measuring colors more accurately. Further, an object of the present invention is that even if the color measurement target is made of a relatively small size, thick and translucent material, the color difference from the visual tint is small, and the color can be measured more accurately. It is an object of the present invention to provide a color measuring device capable of coloring and a color measuring method using the color measuring device.

That is, according to the present invention, the mask member for the color measuring device shown below is provided.
[1] A position between the color measurement target and the light source, in which a window portion physically penetrating in the thickness direction is formed, and at a position where the window portion is in contact with the color measurement target to close the window portion. wherein a measurement target disposed to the measurement target and a mask member for Hakairosu Ru colorimetry apparatus, Ri transparent or translucent der maximum opening diameter of the window portion, wherein with at 20mm or less A mask member that is smaller than the size to be measured.
[2] The mask member according to the above [1], wherein the total light transmittance in the wavelength region of 400 to 700 nm measured in accordance with JIS K 7631-1: 1997 is 80% or more .
[3 ] Acrylic resin, polycarbonate resin, polyethylene terephthalate resin, hard polyvinyl chloride resin, polystyrene resin, polypropylene resin, polyethylene resin, methyl methacrylate acrylonitrile butadiene styrene resin, acrylonitrile styrene resin, polyamide resin, fluororesin, epoxy resin, quartz, Alternatively, the mask member according to the above [1] or [2] , which is made of glass.

Further, according to the present invention, the following color measuring device is provided.
[4] the window portion for physically penetrating in the thickness direction is formed, is between the object of color measurement and the light source, and includes a mask member disposed at a position abutting the object of color measurement, the A color measuring device that measures the color of the measurement target by arranging the measurement target at a position that closes the window portion, and the mask member is the mask member according to any one of [1] to [3]. Color measuring device.

Further, according to the present invention, the following color measuring method is provided.
[ 5 ] A color measuring method comprising a step of measuring a color to be measured using the color measuring device according to the above [4].

According to the present invention, even if the color measurement target is made of a relatively small size, thick and translucent material, the color difference from the visual tint is small and the color can be measured more accurately. It is possible to provide a mask member for a color measuring device that can be used as a device. Further, according to the present invention, even if the color measurement target is made of a relatively small size, thick and translucent material, the color difference from the visual tint is small, and the color measurement is performed more accurately. It is possible to provide a color measuring device capable of providing a color measuring device and a color measuring method using the color measuring device.

It is a front view which shows typically one Embodiment of the mask member of this invention. It is a perspective view which shows one Embodiment of the mask member of this invention schematically. It is a schematic diagram which shows one Embodiment of the color measuring apparatus of this invention. It is a schematic diagram explaining the usage mode of the color measuring apparatus of this invention. It is a schematic diagram explaining the usage mode of the color measuring apparatus of this invention.

<Mask member>
Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the following embodiments. FIG. 1 is a front view schematically showing an embodiment of the mask member of the present invention. Further, FIG. 2 is a perspective view schematically showing an embodiment of the mask member of the present invention. As shown in FIGS. 1 and 2, the mask member 10 of the present embodiment is a disk-shaped member in which a window portion 5 penetrating in the thickness direction thereof is formed substantially in the center. The window portion 5 is formed so as to optically penetrate in the thickness direction of the mask member 10. "Optically penetrating" means not only physically penetrating, but also light, especially visible light, as long as it can pass through. Specifically, it may be a window portion provided with a transparent material such as glass, but it is preferable that a physically penetrating window portion is formed.

The overall shape of the mask member is not limited to the disk shape shown in FIGS. 1 and 2, and may be any shape. However, in consideration of practical handleability and the like, the disk shape shown in FIGS. 1 and 2 is preferable. Further, the shape of the window portion is not limited to the circular shape shown in FIGS. 1 and 2, and may be any shape. However, substantially, it is preferably any of a circular shape, an elliptical shape, and an oval shape.

A general mask member used in a conventional colorimeter or the like is made of an opaque material such as a metal plate, a metal coating plate, or a resin plate. On the other hand, the mask member 10 for the color measuring device of the present embodiment is a transparent or translucent member. The present inventor uses a color measuring device in which such a transparent or opaque mask member 10 is arranged between a color measuring target and a light source and at a position where the color measuring target is in contact with the light source, so that the size of the mask member 10 is relatively large. It was found that even if the color measurement target is small, the color difference from the visual tint is small and the color can be measured more accurately.

The visible light transmittance of the mask member 10 is preferably 80% or more, more preferably 85% or more, particularly preferably 90% or more, and most preferably 95 to 100%. By setting the visible light transmittance to 80% or more, even if the size of the color measurement target is small, the color difference from the visual tint can be further reduced, and more accurate color measurement becomes possible. .. The "visible light transmittance" in the present specification is the visible light transmittance in the wavelength region of 380 to 780 nm measured in accordance with JIS R 3106: 2019.

The mask member 10 is usually made of a transparent or translucent material (hereinafter, collectively referred to as "transparent material"). Examples of such transparent materials include acrylic resin, polycarbonate resin, polyethylene terephthalate resin, hard polyvinyl chloride resin, polystyrene resin, polypropylene resin, polyethylene resin, methyl methacrylate acrylonitrile butadiene styrene resin, acrylonitrile styrene resin, polyamide resin, and fluororesin. Examples thereof include epoxy resin, quartz, and glass. Among them, resin materials such as acrylic resin, polycarbonate resin, polyethylene terephthalate resin, hard polyvinyl chloride resin, and polystyrene resin are preferable because they are easy to shape and are inexpensive and easily available.

_{The maximum opening diameter D 1} (FIG. 1) of the window portion 5 of the mask member 10 is usually smaller than the measurable size of the color measurement target (sample). That is, the maximum opening diameter D ₁ of the window portion 5 can be appropriately set according to the size or the like of the object of color measurement. _{Specifically, the maximum opening diameter D 1} of the window portion 5 of the mask member 10 is preferably 20 mm or less, more preferably 15 mm or less, and particularly preferably 13 mm or less. Incidentally, there is no particular limitation on the lower limit of the maximum opening diameter D ₁ of the window portion 5, it may be any in effect on the measuring diameter or a spectrophotometer (for example, more than 4 mm).

The outer diameter (maximum diameter) D ₂ (FIG. 1) of the mask member 10 is not particularly limited, and may be appropriately determined according to the size and the like of the color measuring device main body to be attached. Specifically, the outer diameter D ₂ of the mask member 10 may be about 30 to 100 mm. Further, the thickness T (FIG. 2) of the mask member 10 is not particularly limited, and may be appropriately determined within a practical range. Specifically, the thickness T of the mask member 10 may be about 0.1 to 5.0 mm.

The mask member according to the embodiment of the present invention may be composed of only disk-shaped members as shown in FIGS. 1 and 2, and is mounted for mounting on the main body of the color measuring device described later. Other configurations such as a unit and a detection unit for recognizing that the mask member is attached to the main body of the color measuring device may be further provided.

<Color measuring device and color measuring method>
Next, an embodiment of the color measuring device and the color measuring method of the present invention will be described. In one embodiment of the color measuring device of the present invention, a window portion optically penetrating in the thickness direction thereof is formed between the color measuring object and the light source, and is arranged at a position where the color measuring object is in contact with the color measuring object. It is a color measuring device including a mask member to be used. And this mask member is the mask member of one Embodiment of this invention mentioned above. Further, one embodiment of the color measuring method of the present invention includes a step of measuring a color to be measured by using this color measuring device. Hereinafter, the details of the color measuring device and the color measuring method will be described with reference to the drawings.

FIG. 3 is a schematic view showing an embodiment of the color measuring device of the present invention. As shown in FIG. 3, the color measuring device 50 of the present embodiment measures the color through the integrating sphere 8 on which the incident window 2, the irradiation window 4, and the light receiving window 6 are formed, and the incident window 2 and the irradiation window 4. A light source 14 that generates irradiation light to irradiate the surface of the target 12, a light receiving unit 16 that receives the reflected light reflected from the surface of the color measurement target 12 through the light receiving window 6, and the color measurement target 12 and the light source 14. It is a so-called spectroscopic type color measuring device including a mask member 20 arranged between the two, and at a position where it abuts on the color measuring target 12, and an arithmetic control unit 18. The mask member 20 is provided so that the window portion 15 is located at a position corresponding to the irradiation window 4 of the integrating sphere 8.

The inner wall surface of the integrating sphere 8 is coated with a white diffuse-reflecting paint such as magnesium oxide (MgO) or barium sulfate (BaSO _4). The light emitted from the light source 14 and incident on the integrating sphere 8 from the incident window 2 is diffusely reflected on the inner wall surface of the integrating sphere 8, and a part (irradiation light) of the light is diffusely reflected on the irradiation window 4 and the window portion 15 of the mask member 20. The surface of the color measurement target 12 is irradiated through. Then, the light (reflected light) reflected on the surface of the color measurement target 12 is received by the light receiving unit 16 through the light receiving window 6.

It is preferable that the light source 14 can generate light in the visible light region (wavelength region 380 to 780 nm). As the light source 14, for example, a xenon lamp or the like can be used. When light having a specific wavelength component is used, a spectroscope may be provided between the light source 14 and the incident window 2. The light receiving unit 16 includes, for example, a spectroscopic lens, a spectroscope, and an array sensor in which a plurality of light receiving elements are arranged. The light receiving unit 16 disperses the reflected light received through the light receiving window 6 with a spectroscopic lens and introduces it into the spectroscope, and outputs the value of the emitted light amount for each wavelength component of the array sensor to the arithmetic control unit 18. Then, the information processed by the arithmetic control unit 18 can be output to the outside through the input / output interface 35.

The color measuring device 50 of the present embodiment includes the above-mentioned transparent or translucent mask member 20 in which a window portion 15 penetrating in the thickness direction thereof is formed. Therefore, if the color measuring device 50 of the present embodiment is used, even if the color measuring target 12 is relatively small in size, the color difference from the visual tint is small, and the color can be measured more accurately. .. The color measuring device of the present invention is irradiated from a single direction in addition to the so-called diffuse lighting type color measuring device 50 that measures the surface of the color measurement target 12 using diffused illumination light as shown in FIG. It may be a so-called unidirectional illumination type color measuring device that measures colors using light.

4A and 4B are schematic views illustrating a usage mode of the color measuring device of the present invention. In order to measure the color of the surface of the color measurement target 22, first, as shown in FIG. 4A, the color measurement target 22 is arranged in front of the window portion 25 of the mask member 30 provided in the color measurement device 60 (FIG. 4A). ). Then, the holder 32 abuts and holds the color measurement target 22 against the mask member 30 (FIG. 4B). In this state, the color measuring device 60 is operated, and the surface of the color measuring target 22 is irradiated with irradiation light through the window portion 25. Next, the surface of the color measurement target 22 can be measured by receiving and analyzing the generated reflected light in the color measuring device 60. As described above, since the color measuring device 60 includes the above-mentioned transparent or translucent mask member 30 in which the window portion 25 penetrating in the thickness direction thereof is formed, the color measuring device 60 can be used. Even for the color measurement target 22 having a relatively small size, the color difference from the visual tint is small, and the color can be measured more accurately. Further, the mask members 30 having different maximum opening diameters of the window portion 25 can be appropriately selected and attached according to the size of the color measurement target 22 and the like, and the color can be measured. Therefore, according to the color measuring device and the color measuring method of the present embodiment, it is possible to flexibly measure the color accurately corresponding to the size and shape of the surface of the color measuring target and the color measuring target itself.

The color measuring device is not limited to the horizontal stationary type color measuring device as shown in FIGS. 4A and 4B, and may be any device provided with the above-mentioned mask member. For example, it may be a stationary type color measuring device in which a color measuring object is placed on the upper surface thereof to measure the color. Further, it may be a portable (handy type) color measuring device.

Hereinafter, the present invention will be specifically described based on examples, but the present invention is not limited to these examples. In addition, "part" and "%" in Examples and Comparative Examples are based on mass unless otherwise specified.

<Preparation of test piece>
(Test piece 1)
100 parts of soft transparent polyvinyl chloride (PVC), 0.222 parts of white pigment 1 (trade name "Discol EP-4050", manufactured by Dainichiseika Kogyo Co., Ltd.), black pigment 1 (trade name "Discol P-4710") , Dainichiseika Kogyo Co., Ltd.) 0.00046 parts, green pigment 1 (trade name "Discol EP-4514", manufactured by Dainichiseika Kogyo Co., Ltd.) 0.0014 parts, and yellow pigment 1 (trade name "Discol") EP-4440 ”, manufactured by Dainichiseika Kogyo Co., Ltd.) 0.0218 parts were added and mixed, and then press-molded to obtain a press sheet having a thickness of about 2 mm. The obtained press sheet was cut to an appropriate size to obtain a translucent test piece 1 colored in yellowish green.

(Test pieces 2 to 10)
Translucent test pieces 2 to 10 colored in the hues shown in Table 1 were obtained in the same manner as in the above-mentioned test piece 1 except that the colorant (pigment) was used in the composition shown in Table 1. Details of the colorants (pigments) in Table 1 are shown below.
・ White pigment 1: Product name “Discol EP-4050”, manufactured by Dainichi Seika Kogyo Co., Ltd. ・ Black pigment 1: Product name “Discol P-4710”, manufactured by Dainichi Seika Kogyo Co., Ltd. ・ Green pigment 1: Product name “ Discol EP-4514 ", manufactured by Dainichi Seika Kogyo Co., Ltd.-Yellow pigment 1: trade name" Discol EP-4440 ", manufactured by Dainichi Seika Kogyo Co., Ltd.-Red pigment 1: trade name" Discol P-4120 ", large Made by Nisseika Kogyo Co., Ltd. ・ Yellow pigment 2: Product name "Discor P-4443", manufactured by Dainichi Seika Kogyo Co., Ltd. ・ Brown pigment 1: Product name "Discol P-4820", manufactured by Dainichi Seika Kogyo Co., Ltd. ・ Yellow pigment 3: Product name "Discol P-4490", manufactured by Dainichi Seika Kogyo Co., Ltd.-Red pigment 2: Product name "Discol EP-4170", manufactured by Dainichi Seika Kogyo Co., Ltd.-Purple pigment 1: Product name "Discol P" -4928 ”, manufactured by Dainichi Seika Kogyo Co., Ltd. ・ Red pigment 3: trade name“ Discol P-4191 ”, manufactured by Dainichi Seika Kogyo Co., Ltd. ・ Blue pigment 1: trade name“ Discol P-4620 ”, manufactured by Dainichi Seika Kogyo Made by the company

<Manufacturing of mask members>
(Example 1)
A transparent plate-shaped member (thickness: 1 mm) made of acrylic resin (polymethylmethacrylate) was shape-processed to obtain a mask member (mask 1) having a shape as shown in FIGS. 1 and 2. Maximum opening diameter _{D 1} of the window portion of the mask 1 is set to 15 mm, an outer diameter _{D 2} was 60 mm. The total light transmittance of the mask 1 in the wavelength region of 400 to 700 nm measured in accordance with JIS K 7361-1: 1997 was 90% or more.

(Examples 2 to 3)
11mm maximum opening diameter D ₁ of the window section, except that a 7 mm, to obtain a mask member (mask 2 and 3) in the same manner as in Example 1 above.

(Comparative Examples 1 to 4)
_{Three types of opaque target masks (D 1} : 30 mm, 11 mm, 7 mm), which are accessories of a commercially available spectrophotometer (trade name "CM-3600A", manufactured by Konica Minolta Co., Ltd.), were used as masks 4 to 6. _{Further, a mask (D 1} : 15 mm) obtained by shaping an opaque plate-shaped material (thickness: 1 mm) was used as the mask 7. The total light transmittance of these masks 4 to 7 was 0%.

<Evaluation>
(Measurement and calculation of color difference (ΔE *))
Masks 1 to 7 were attached to color measurement points (irradiation windows) of commercially available spectrophotometers (trade name "CM-3600A", manufactured by Konica Minolta Co., Ltd.). Then, using the SCI and CIE standard light sources D65, the test pieces 1 to 10 are measured under the conditions of a field of view: 10 ° and a white background, and a mask 4 (D ₁ : 30 mm) having a small visual tint and color difference is applied. The "standard" color difference ΔE * was calculated. The results are shown in Table 2.

By using a color measuring device including a mask member according to an embodiment of the present invention, even a relatively small color measuring object has a small color difference from the visual tint and can measure colors more accurately. Can be done.

2: Incident window 4: Irradiation window 5, 15, 25: Window part 6: Light receiving window 8: Integrating sphere 10, 20, 30: Mask member 12, 22: Color measurement target 14: Light source 16: Light receiving part 18: Arithmetic control Part 32: Holder 35: Input / output interface 50, 60: Color measuring device

Claims (5)

The measurement is performed at a position between the color measurement target and the light source, where a window portion physically penetrating in the thickness direction is formed, and at a position where the color measurement target is in contact with the color measurement target, and at a position where the window portion is closed. a mask member for Hakairosu Ru colorimetry apparatus the measuring object by placing the object,
Ri transparent or semi-transparent der,
A mask member having a maximum opening diameter of the window portion of 20 mm or less and smaller than the dimension to be measured. The mask member according to claim 1, wherein the total light transmittance in the wavelength region of 400 to 700 nm measured in accordance with JIS K 7631-1: 1997 is 80% or more. Acrylic resin, polycarbonate resin, polyethylene terephthalate resin, hard polyvinyl chloride resin, polystyrene resin, polypropylene resin, polyethylene resin, methyl methacrylate acrylonitrile butadiene styrene resin, acrylonitrile styrene resin, polyamide resin, fluororesin, epoxy resin, quartz, or glass The mask member according to claim 1 or 2 , which is formed. Window to physically penetrate in the thickness direction is formed, it is between the object of color measurement and the light source, and includes a mask member disposed at a position abutting the object of color measurement, the window A color measuring device that measures the color of the measurement target by arranging the measurement target at a closed position.
A color measuring device in which the mask member is the mask member according to any one of claims 1 to 3. A color measuring method comprising a step of measuring a color to be measured using the color measuring device according to claim 4.

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