JP2015188665A - System, method, and apparatus for measuring optical characteristics of coating material, and laminate structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system, method, and apparatus for measuring optical characteristics of coating material capable of measuring a coating material such as a cosmetic which is on a base layer such as a skin and the optical characteristics of the base layer in a separated manner, and also to provide a laminate structure.SOLUTION: The measuring system comprises: a transparent substrate one face of which is provided with an adhesive layer for forming a coating layer coated with a coating material and the other face of which is closely in contact with base layer; a light irradiation unit for projecting irradiation light toward a first laminate structure formed of three layers, i.e., the coating layer, the transparent substrate, and the base layer; an optical system for projecting light with the irradiation light reduced to a part of the first laminate structure; and an imaging unit which is arranged inclinedly with respect to the incident direction in which the light enters, and which captures, from the direction inclined with respect to the incident direction, an image of a distribution of the light reflected off the coating layer of the first laminate structure and a distribution of the light passing through the coating layer and the transparent substrate and reflected off the base layer of the first laminate layer, in a separated basis.

Description

  The present invention relates to a measurement system, a measurement method, a measurement apparatus, and a laminated structure of an optical property of a coating material, and more specifically, the optical property of a multilayer structure including scattering materials such as human skin (skin) and cosmetics, that is, Measuring system, measuring method, measuring device for optical properties of coating material for measuring optical properties of coating material such as cosmetics on base layer such as skin and base layer and measuring them, and lamination used for measuring optical properties of coating material Concerning the structure.

Conventionally, in order to obtain a desired skin by applying makeup such as foundation to human skin, it has been performed to measure the transparency of human skin or observe the surface condition of the skin using a predetermined imaging optical system. (See Patent Documents 1 and 2).
In addition, the human skin to which cosmetics such as foundation are applied is measured using a predetermined imaging optical system, and the light transmittance, reflected light distribution, intensity, etc. of the application material such as cosmetics applied to the human skin are measured. Therefore, cosmetics and the like are evaluated (see Patent Document 3 and Non-Patent Document 1).

In Patent Document 1, slit light is obliquely irradiated to the surface of the skin to be measured through the slit, and the reflected light from the skin surface is shielded by the shielding plate adjacent to the slit, while adjacent to the shielding plate. The diffused light is diffused inside the skin through the opening, and the diffused light emitted from a position different from the irradiation position of the slit light is received by an image sensor such as a CCD or a line sensor. A transparency measuring device for calculating a transparency index is disclosed.
Patent Document 2 discloses that the S-polarized light and the P-polarized light are incident on the surface of the skin to be observed, and the S-polarized light component and the P-polarized light component of the reflected light when the S-polarized light is incident. The S-polarized component and the P-polarized component of the reflected light when P-polarized light is incident are received, and the surface reflected light component and the internally reflected light component when natural light is incident on the skin based on the received light intensity. Skin, which is obtained by independently obtaining surface reflected light images and internally reflected light images, analyzing the state of fine lines and pores from the surface reflected light images, and analyzing uneven color such as stains and freckles from the internally reflected light images A surface observation method and apparatus are disclosed.

Further, in Patent Document 3, continuous light including a predetermined wavelength band such as an ultraviolet wavelength region is applied to a coating material such as a foundation applied to a substrate such as human skin, and reflection from the coating material is performed. From the reflected light data obtained by collecting and receiving the light, the reflectance change rate (reflectance first-order differential value) in a predetermined wavelength band is calculated, and a predetermined coating material is determined from a predetermined relational expression. A method and an apparatus for measuring the light transmittance of a coating material for calculating the transmittance in a wavelength band are disclosed.
In Non-Patent Document 1, 16-band pinhole light is irradiated at predetermined time intervals through a 16-band pass filter to makeup skin to which cosmetics such as human skin and foundation are applied, and the like. With this imaging element, it is disclosed that a multiband reflected light pattern image is imaged and the obtained reflected light pattern image is analyzed to estimate the optical characteristics of the cosmetic.

JP 2009-240644 A Japanese Patent Application Laid-Open No. 07-075629 JP 2001-242075 A

Study on Ultra Hyper Chromatic Foundation Utilizing The Properties of Photocopy Toners, IFSCC Congress 2006 Osaka, Japan

By the way, since the technique disclosed in Patent Document 1 evaluates the transparency of human skin (skin) as a measurement target, in this technique, an application material such as cosmetics such as a foundation applied to the skin or the like is appropriately used. However, there is a problem that the human skin and the optical characteristics of the coating material cannot be obtained separately.
In addition, since the technique disclosed in Patent Document 2 is intended to analyze and evaluate the state of the skin surface of human skin (skin) as an observation target, in this technique, such as a foundation applied to the skin or the like. There was a problem that coating materials such as cosmetics could not be properly evaluated, and the human skin and the optical properties of the coating material could not be obtained separately. Even if this technology is applied to cosmetics and other coating materials applied to the skin, this technology uses two polarizing plates to observe a combination of P-polarized light and S-polarized light. Therefore, in this technique, when the component of the coating material such as cosmetics contains a component that eliminates polarization, there is a problem that the surface state of the coating material cannot be observed itself.

In addition, the technique disclosed in Patent Document 3 determines the light transmittance of a predetermined wavelength band such as ultraviolet rays of a coating material such as a cosmetic applied to a substrate such as human skin from the reflected light data from the coating material. Therefore, this technology cannot properly evaluate the coating materials such as cosmetics applied to the skin, etc., and separates the human skin and the optical properties of the coating materials. There was a problem that could not be obtained.
The technique disclosed in Non-Patent Document 1 is to estimate the optical characteristics of cosmetics by analyzing a multiband reflected light pattern image. In this technique, a coating material such as cosmetics applied to the skin or the like is used. There is a problem in that it cannot be evaluated properly and the optical properties of human skin and coating material cannot be obtained separately.
For this reason, with the above conventional technology, the reflection of each layer of the cosmetic layer and the skin layer, which is a very important item for finishing, is easily separated from the light reflection of the skin to which cosmetics are applied, and each light reflection is evaluated. There was a problem that it was difficult to do. For this reason, there has been a problem that it is very difficult to quantitatively determine and develop product performance target values for cosmetics and the like.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to measure the optical characteristics of the coating material capable of separately measuring the optical characteristics of the coating material such as cosmetics on the base layer such as skin and the base layer. It is in providing a measuring method, a measuring apparatus, and a laminated structure.
In addition to the above object, another object of the present invention is, for example, a scattering material such as human skin (skin), cosmetics, printed matter printed with ink on paper, and a laminated structure including a scattering layer such as a coating film. The optical properties of the multilayer structure can be measured separately, thereby analyzing and researching cosmetics such as basic cosmetics and makeup cosmetics, skin care products, ink for printed materials, and coating films for laminated structures. An object of the present invention is to provide a measurement system, a measurement method, a measurement apparatus, and a laminated structure used for measurement of optical characteristics of a coating material, which can support development.

  In order to achieve the above object, a measurement system according to a first aspect of the present invention is a system for measuring optical properties of a coating material applied on a base layer, wherein the coating material is applied on one surface. A transparent substrate having an adhesive layer for forming a layer and having a base layer in close contact with the other surface, and a coating layer, a transparent substrate, and a base layer formed with the base layer in close contact with the other surface of the transparent substrate In order to irradiate a part of the first laminated structure with a light irradiating unit that emits irradiation light toward the first laminated structure having a layered structure, and an irradiation light emitted from the light irradiating unit. The optical system and the narrowed light are arranged so as to be inclined with respect to the incident direction in which the light is incident on the first laminated structure, and are reflected by the coating layer of the first laminated structure from the direction inclined with respect to the incident direction. Light distribution, reflected through the coating layer and the transparent substrate and reflected by the base layer of the first laminated structure A photographing unit for distribution and photographed as the first image are separated, and having a.

  In order to achieve the above object, the measuring apparatus according to the second aspect of the present invention is an apparatus for measuring the optical characteristics of a coating material applied on a base layer, and is an adhesive layer on one surface of a transparent substrate. The coating material is applied to the other surface, and the base layer is adhered to the other surface. The coating layer, the transparent substrate, the first laminated structure having the three-layer structure of the base layer, and the coating material on one surface of the transparent substrate. A fixed portion for fixing a second laminated structure having a two-layer structure of a coating layer and a transparent substrate formed by coating, and toward the first laminated structure and the second laminated structure fixed to the fixed portion. A light irradiating unit that emits irradiation light, and an optical system for squeezing the irradiation light emitted from the light irradiating unit and irradiating the narrowed light to a part of the first laminated structure and the second laminated structure, respectively In the incident direction in which the narrowed light is incident on the first laminated structure fixed to the fixing portion In the direction inclined with respect to the incident direction, the distribution of light reflected by the coating layer of the first laminated structure and the base layer of the first laminated structure that passes through the coating layer and the transparent substrate are transmitted. A photographing unit that separates the reflected light distribution and photographs the first image, and photographs the light distribution reflected by the coating layer of the second laminated structure fixed to the fixing unit as the second image, and a photographing unit From the first image and the second image taken in step 1, the distribution of the light transmitted through the coating layer and the transparent substrate and reflected by the base layer of the first laminated structure is obtained, and the optical characteristics of the coating layer and the base layer are separated. And an evaluation unit for evaluation.

In the first and second aspects, the light irradiating unit is further formed by applying a coating material on one surface of the transparent substrate, and a second laminated structure having a two-layer structure of the coating layer and the transparent substrate. The image capturing unit further captures the distribution of light reflected by the coating layer of the second laminated structure as a second image, and further includes an image capturing unit. From the first image and the second image taken in step 1, the distribution of the light transmitted through the coating layer and the transparent substrate and reflected by the base layer of the first laminated structure is obtained, and the optical characteristics of the coating layer and the base layer are separated. It is preferable to have an evaluation unit to be evaluated.
Furthermore, it is preferable to have a fixing portion for fixing the first laminated structure so that the photographing unit and the first laminated structure are arranged to be inclined.

  In order to achieve the above object, a measurement method according to the third aspect of the present invention is a method for measuring optical characteristics of a coating material applied on a base layer, and is an adhesive layer on one surface of a transparent substrate. A coating material is applied on top to form a coating layer, and a base layer is adhered to the other surface to form a first laminated structure having a three-layer structure of the coating layer, the transparent substrate, and the base layer. A part of the one laminated structure is irradiated with the narrowed light, and the narrowed light is reflected by the coating layer of the first laminated structure from a direction inclined with respect to the incident direction in which the narrowed light is incident on the first laminated structure. The distribution of the light and the distribution of the light transmitted through the coating layer and the transparent substrate and reflected by the base layer of the first laminated structure are separated and photographed as a first image.

  In the third aspect, a coating material is further coated on the adhesive layer of the transparent substrate to form a coating layer, and a second laminated structure having a two-layer structure of the coating layer and the transparent substrate is formed and formed. The focused light is irradiated to a part of the second laminated structure, the distribution of the light reflected by the coating layer of the second laminated structure is photographed as a second image, the photographed first image, From the two images, it is preferable to obtain a distribution of light transmitted through the coating layer and the transparent substrate and reflected from the base layer of the first laminated structure, and to evaluate the optical characteristics of the coating layer and the base layer separately.

  Furthermore, in order to achieve the above-mentioned object, the laminated structure according to the fourth aspect of the present invention is used for photographing in order to measure the optical characteristics of the coating material applied on the human skin. A laminated structure used, which includes a transparent substrate having an adhesive layer for forming a coating layer coated with a coating material on one surface, a scatterer and an absorber, and is in close contact with the other surface of the transparent substrate The skin replica that simulates human skin, and is inserted between the transparent substrate and the skin replica to reduce the reflection of light at the interface between the transparent substrate and the skin replica, thereby matching the transparent substrate and the skin replica. And an oil.

In each of the above embodiments, the coating material is a foundation for applying to human skin, and the coating layer is preferably a foundation layer coated with a foundation.
Furthermore, it is preferable that the base layer includes a scatterer and an absorber, has a skin replica that simulates human skin, and the transparent substrate and the skin replica constitute a laminated structure that is closely attached via matching oil.
The base layer is preferably human skin.

According to the present invention, the optical properties of a coating material such as cosmetics on a base layer such as skin and the base layer can be measured separately.
Further, according to the present invention, in addition to the above effects, for example, human skin (skin) and cosmetics, printed matter printed with ink on paper, a multilayer structure including a scattering material such as a laminated structure including a scattering layer such as a coating film The optical properties of structures can be measured separately, thereby analyzing, researching and developing cosmetics such as basic cosmetics and makeup cosmetics, skin care products, printed inks, and coatings on laminated structures. Can help.

It is a schematic diagram which shows an example of the measuring system of the optical characteristic of the coating material which concerns on embodiment of this invention. It is sectional drawing of one Example of the laminated structure used for the measurement system shown in FIG. It is sectional drawing of the other Example of the laminated structure used for the measuring system shown in FIG. It is a perspective view which shows typically an example of the measurement state of the laminated structure in the measurement system shown in FIG. It is sectional drawing which shows typically the measurement state of the laminated structure shown to FIG. 4A. It is a graph which shows an example of the measurement result by the measurement system shown in FIG. 1 using the laminated structure shown in FIG. It is a graph which shows an example of the measurement result by the measuring system shown in Drawing 1 using the measuring jig shown in Drawing 3. It is a graph which shows the internal reflection of the laminated structure obtained based on the measurement result shown in FIG.5 and FIG.6. It is a graph equivalent to the measurement result by a prior art obtained based on the measurement result shown in FIG.5 and FIG.6.

An optical property measuring system, a measuring method, a measuring apparatus, and a laminated structure used for measuring optical properties of a coating material according to the present invention will be described in detail below based on preferred embodiments shown in the accompanying drawings. explain.
Hereinafter, the measurement system and the measurement method according to the present invention will be described as a representative example of a measurement system using a laminated structure, but the present invention is not limited to these, and may be any one, for example, Of course, the measuring jig may be placed on the human skin and measured. In the present specification, a numerical range represented by using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.

FIG. 1 is a schematic diagram showing an example of a system for measuring optical characteristics of a coating material according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of an embodiment of the laminated structure used in the measurement system shown in FIG.
As shown in FIG. 1, an optical property measurement system (hereinafter simply referred to as a measurement system) 10 of a coating material according to the present invention includes a light source 12, a condenser lens 14, a slit plate 16, and a condenser lens 18. And a condenser lens 20, a laminated structure 22, a support member 24 for the laminated structure 22, a condenser lens 26, a CCD camera 28, and an evaluation device 30.
The condensing lens 14, the slit plate 16, the condensing lens 18, and the condensing lens 20 are disposed in the optical path of the irradiation light emitted from the light source 12, and the irradiation light is formed in a predetermined shape such as a circle or a slit. The incident optical system for irradiating the laminated structure 22 with an arbitrary shape is configured. Further, the light source 12, the above-described incident optical system, the support member 24 of the laminated structure 22, the condensing lens 26, the CCD camera 28, and the evaluation device 30 constitute an apparatus for measuring the optical characteristics of the coating material according to the present invention. .

The light source 12 is for emitting irradiation light toward the laminated structure 22 and constitutes the light irradiation unit of the present invention. For example, a white light that emits white light as irradiation light, such as a xenon lamp or a mercury lamp. Examples include a light source, a pseudo-white light source composed of a laser light source and a phosphor, a white light source composed of a laser of three primary colors such as RGB, or a narrow-band light source such as an LED, or a narrow-band light source such as a laser or LED of each color. be able to.
As the light source 12, lasers or LEDs of various wavelengths may be used, but a white light source is used, and a band-pass filter (not shown) is inserted in the light path on the emission side to stack light of various wavelengths. You may prepare to irradiate the structure 22.
The condensing lens 14 is a lens that condenses the irradiation light emitted from the light source 12 on the slit 16 a of the slit plate 16.

  The slit plate 16 has a slit 16a, and functions as a diaphragm for restricting, that is, adjusting, the amount of irradiation light emitted from the light source 12. The slit plate 16 reduces the light amount by adjusting the irradiation light emitted from the light source 12 and collected by the condenser lens 14 through the slit 16a, and the light with the reduced light amount, that is, the light amount is adjusted. The slit light is used. The slit plate 16 is preferably arranged at the focal point of the condenser lens 14.

In the illustrated example, the slit plate 16 having the slit 16a is used as the stop in the incident optical system, and the laminated light 22 is irradiated with the slit light. However, the present invention is not limited to this and has a circular opening. A diaphragm plate may be used to irradiate the laminated structure 22 with circular light, or a diaphragm plate having various shapes of openings may be used to irradiate the laminated structure 22 with various shapes of light.
Note that the sizes of the slit 16a, the circular opening, and the openings of various shapes are not particularly limited, but in the case of the slit 16a, the slit width is preferably 0.2 mm to 2.0 mm, for example. More preferably, it is 0.5 mm to 1.0 mm.
In the measurement system 10 of the present embodiment, the shape and size of the slit 16a of the slit plate 16, the circular opening, and the openings of various shapes are the same as the shape and size of the irradiation light irradiated on the laminated structure 22. It is preferable to match or approximately match.

The condensing lens 18 is a lens that converts light amount adjusting slit light (light with reduced light amount) that has passed through the slit 16 a of the slit plate 16 into parallel light. The condenser lens 18 is preferably arranged so that the arrangement position of the slit plate 16 is the focal position of the condenser lens 18.
The condensing lens 20 constitutes a parallel optical system with the condensing lens 18, condenses the parallel light collimated by the condensing lens 18 into slit light, and irradiates the surface of the laminated structure 22 with the slit light. Is to do. The condensing lens 20 is preferably arranged so that the arrangement position of the surface of the laminated structure 22 is the focal position of the condensing lens 18.

The laminated structure 22 constitutes the first laminated structure of the three-layer structure of the present invention. As shown in an enlarged view in FIG. 2, the transparent substrate 32 and one surface of the transparent substrate 32 (upper surface in the figure). ) Formed on the adhesive layer 34, a coating layer 36 such as a foundation layer on which a coating material such as a foundation is applied, and the other surface (lower surface in the drawing) of the transparent substrate 32, For example, it has a base layer 38 such as human skin or a skin replica that simulates human skin.
The transparent substrate 32 optically reflects the reflected light on the surface of the coating layer 36 such as a foundation layer and the reflected light that passes through the coating layer 36 and the transparent substrate 32 and is reflected from the base layer 38 such as human skin or skin replica. It is for separating. The transparent substrate 32 is not particularly limited as long as it is transparent. For example, a transparent glass plate, a transparent resin plate, or the like can be raised. The transparent substrate 32 constitutes an intermediate layer of the laminated structure 22 having a three-layer structure.

The shape of the transparent substrate 32 is not particularly limited, and may be, for example, a rectangle, a polygon, a circle, an ellipse, or the like, as shown in FIG. 4A, depending on the shape of the coating layer 36 or the base layer to be measured. What is necessary is just to select suitably.
The size of the planar shape of the transparent substrate 32 is not particularly limited, and may be various sizes with respect to the shape of the transparent substrate 32, and may be appropriately selected according to the size of the coating layer 36 or the base layer to be measured. .
The thickness of the transparent substrate 32 is not particularly limited, but is preferably 0.5 mm to 1.5 mm, for example, and more preferably 0.8 mm to 1.2 mm.
In particular, when the thickness of the transparent substrate 32 is 1 mm, the shape of the diaphragm of the incident optical system described above is most preferably the slit shape of the slit 16a of the slit plate 16, and the slit width is 0.5 mm to 1 mm. 0.0 mm is preferred.

In order to obtain the optical characteristics of the coating material to be evaluated in the present invention, the pressure-sensitive adhesive layer 34 applies the coated coating material when the coating material is coated on one surface (upper surface in the drawing) of the transparent substrate 32. It is a layer for ensuring adhesion between the coating layer 36 to which the coating material is applied and the transparent substrate 32. The adhesive layer 34 may be any material as long as it is transparent and adhesive.
Further, the thickness of the adhesive layer 34 is not particularly limited, but is preferably 0.005 mm to 0.05 mm, and more preferably 0.01 mm to 0.03 mm, for example.
The adhesive layer 34 is preferably formed on the entire surface of one surface of the transparent substrate 32, but the portion where the coating layer 36 is formed may be a part of the one surface of the transparent substrate 32. In some cases, it may be formed only on the portion where the coating layer 36 is formed.

The coating layer 36 is a thin film of coating material formed on one surface (upper surface in the drawing) of the transparent substrate 32 via the adhesive layer 34 in order to obtain the optical characteristics of the coating material to be evaluated in the present invention. Layer. The coating layer 36 constitutes the upper layer of the laminated structure 22 having a three-layer structure.
The coating material used in the present invention is not particularly limited as long as it is a coating material containing a scattering medium. For example, cosmetics and skin care products applied to human skin and skin, specifically, makeup bases , Foundation cosmetics such as foundation, sunscreen, makeup cosmetics such as teak, eye shadow, nail polish, skin care products such as lotion, milky lotion, cream, etc. Examples thereof include a paint for forming a coating film of another laminated structure including a scattering layer such as a coating film.
The thickness of the coating layer 36 is not particularly limited, but is preferably a thin film having a thickness of 0.005 mm to 0.05 mm, for example, and more preferably 0.01 mm to 0.02 mm. good.
The coating layer 36 may be formed on the entire surface of one surface of the transparent substrate 32 as long as the optical measurement necessary for the analysis of the optical characteristics of the coating material can be performed.

The base layer 38 is the other surface (lower surface in the figure) of the transparent substrate 32 in order to obtain the human skin to be evaluated in the present invention, the paper for printed matter, and the optical characteristics of the base of other laminated structures. It is closely attached to. The base layer 38 constitutes a lower layer of the laminated structure 22 having a three-layer structure.
The base layer 38 is usually applied with the above-described coating material and is not particularly limited as long as it includes a scattering medium. For example, human skin, skin replicas that simulate human skin, and paper for printed matter A layer such as a base of a laminated structure.
In addition, reflection at the interface can be reduced by inserting matching oil between the base layer 38 and the transparent substrate 32.

The skin replica is a translucent material that simulates human skin, and is preferably a silicon sample in which a scatterer and an absorber are mixed.
Here, examples of the scatterer include titanium oxide.
Examples of the absorber include color ink, color paint, and colorant.
Examples of silicon include silicon and a silicone resin solution mixed at a ratio of 10: 1 and solidified.
The mixing ratio of the scatterer, the absorber and the silicone is 1 mg to 50 mg of the scatterer with respect to 10 g of silicone, and preferably 0 cc to 0.1 cc of the absorber.

  The laminated structure 22 is a three-layer laminated structure in which the above-described coating layer 36, transparent substrate 32, and base layer 38 are laminated in this order. For example, the upper coating layer 36 is a foundation layer or the like. If the transparent substrate 32 of the intermediate layer is a transparent glass slide (for example, 1 mm thick) and the base layer 38 of the lower layer is the above-mentioned skin replica, the optical characteristics of cosmetics such as foundation and the like are simulated. It can be used as a laminated structure sample for separating and evaluating human skin optical characteristics, and it is evaluated by separating the optical characteristics of cosmetics such as foundations and human skin optical characteristics in a pseudo manner. be able to.

In this case, when human skin itself is used as the lower base layer 38 instead of the skin replica, the optical characteristics of cosmetics such as foundation and the optical characteristics of human skin should be evaluated separately. Can do. In this case, a laminated structure 40 having a two-layer structure shown in FIG. 3 is used, and the other surface of the transparent substrate 32 of the laminated structure 40 is brought into close contact with the human skin so that the human skin is the base layer 38. The structure 22 can be configured.
3 constitutes a second laminated structure having a two-layer structure according to the present invention, and includes a base layer 38 of the laminated structure 22 having a three-layer structure shown in FIG. Since no coating layer 36 and the transparent substrate 32 are in close contact with each other through the adhesive layer 34, description thereof is omitted.

As shown in FIGS. 4A and 4B, the surface of the layered structure 22 having the three-layer structure configured as described above, that is, the coating layer 36 is slit by the condenser lens 20 in a predetermined shape, for example, a slit width of 1 mm. The slit light 42 condensed (converged) into the shape, that is, the narrowed light 42 is irradiated.
Here, the incident angle of the slit light 42 to the coating layer 36 of the laminated structure 22 may be 0 ° as shown in FIGS. 4A and 4B, or may exceed 0 ° as shown in FIG. However, it is preferable to set the angle within the range of 0 ° to 60 °, more preferably, since the reflectance increases when the incident angle is too large. Is preferably 30 ° to 45 °.

  In the example shown in FIGS. 4A and 4B, the slit-shaped irradiation light 42 is incident on the coating layer 36 of the laminated structure 22 at an incident angle of 0 °, and a part thereof is reflected by the surface of the coating layer 36 and the rest. Part of the light passes through the coating layer 36 and the transparent substrate 32 and enters the base layer 38 as slit-like transmitted light 44 at an incident angle of 0 °. A part of the slit-like transmitted light 44 is reflected on the surface of the base layer 38 and the other part is incident on the inside of the base layer 38, but is scattered by a scattering medium such as an internal scatterer and diffusely reflected. And is emitted from the surface of the base layer 38 as internally scattered reflected light 46. A part of the slit-like transmitted light 44 and the internally scattered reflected light 46 reflected by the surface of the base layer 38 passes through the transparent substrate 32 and the coating layer 36 and is emitted from the coating layer 36 to the outside. A part of the reflected slit-like transmitted light 44 and a part of the internally scattered reflected light 46 are reflected by the back surface (surface on the transparent substrate 32 side) of the coating layer 36 toward the base layer 38. By the surface reflection or the internal reflection, it is repeated toward the coating layer 36 again, a part is transmitted and radiated to the outside, and the remaining part is reflected back.

The support member 24 constitutes a fixing portion for fixing the first and second laminated structures of the present invention. As shown in FIG. 1, the three-layered laminated structure 22 and the two-layered laminated structure 40 are provided. Each of them is supported and fixed so as to be inclined so that the irradiation light is incident at a predetermined incident angle. The support member 24 may be any member as long as it can support and fix the laminated structure 22 having a three-layer structure and the laminated structure 40 having a two-layer structure at a predetermined angle, and a known support member or fixing member may be used. it can. The support member 24 may support and fix the laminated structure 22 having a three-layer structure and the laminated structure 40 having a two-layer structure at the same time, or alternately support and fix one by one. Also good.
The condensing lens 26 constitutes an imaging optical system, and condenses the light reflected and radiated from the coating layer 36 of the laminated structure 22 having a three-layer structure, and converges the light to be incident on the CCD camera 28. Is. The condenser lens 26 is preferably disposed in the optical path of light from the coating layer 36 toward the CCD camera 28, and the CCD camera 28 is preferably disposed at the focal position of the condenser lens 26.

The CCD (Charge Coupled Device) camera 28 constitutes the photographing unit of the present invention. The incident light emitted from the light source 12 and focused by the slit 16 a of the slit plate 16 enters the laminated structure 22. Receiving light reflected and emitted from the coating layer 36 of the laminated structure 22 from the direction inclined at a predetermined angle with respect to the incident direction (hereinafter simply referred to as reflected light). This is for capturing an image, capturing the first image, and acquiring the image data. When the CCD camera 28 receives light reflected and emitted from the coating layer 36, the CCD camera 28 transmits the light reflected by the coating layer 36 (hereinafter referred to as surface reflected light), the coating layer 36 and the transparent substrate 32. A light distribution including the surface of the base layer 38 of the laminated structure 22 and the distribution of light reflected inside (hereinafter referred to as internal reflection light) in a spatially separated state is photographed as a first image.
In the illustrated example, a CCD camera 28 using a CCD image sensor is used. However, the present invention is not limited to this, and it is sufficient that the light reflected and emitted from the coating layer 36 can be received. Instead of the sensor, a known camera such as a camera using an image sensor made of a solid-state imaging device such as a complementary metal oxide semiconductor (CMOS) image sensor can be used.

In the example shown in FIGS. 4A and 4B, the irradiation light from the light source 12 is incident on the coating layer 36 of the multilayer structure 22 at an incident angle of 0 °, and the reflected light from the coating layer 36 of the multilayer structure 22 is The CCD camera 28 receives the light at an angle of 45 ° and receives the light distribution including the distribution of the surface reflection light and the distribution of the internal reflection light spatially separated by the CCD camera 28, and the first image is captured. Obtained as data. In the example shown in FIG. 1, the incident angle is 30 ° and the light receiving angle is 0 °.
In the present invention, the sum of the incident angle of the irradiation light to the coating layer 36 of the laminated structure 22 and the light receiving angle of the CCD camera 28 of the reflected light from the coating layer 36 of the laminated structure 22 is 30 °. If it is less than that, it becomes difficult to spatially separate the reflected light, specifically, the distribution of the surface reflected light and the distribution of the internal reflected light, so the sum of the incident angle and the light receiving angle is 30 ° or more. It is preferable that

  In the measurement system 10 shown in FIG. 1, as described above, the laminated structure 22 having the three-layer structure shown in FIG. 2 is supported and fixed to the support member 24 and irradiated with the slit light emitted from the light source 12 and squeezed. Then, after capturing the image of the light distribution including the distribution of the surface reflection light and the distribution of the internal reflection light of the laminated structure 22 in a spatially separated state as the first image and acquiring the image data, the support member 24, the laminated structure 22 is removed, and instead, the laminated structure 40 having the two-layer structure shown in FIG. The light reflected on the surface of the coating layer 36 of the laminated structure 40, that is, the distribution of the surface reflected light is photographed as a second image by the CCD camera 28, and the image data is acquired. The light transmitted through the coating layer 36 of the laminated structure 40 is not received by the CCD camera 28 because it passes through the transparent substrate 32 and is emitted to the outside.

The evaluation device 30 constitutes the evaluation unit of the present invention, is constituted by a PC (Personal Computer) or the like, and the image data of the first image and the image of the second image acquired by the CCD camera 28 as described above. Data is received, image analysis of these image data is performed, and the optical characteristics of the coating material of the coating layer 36 and the optical characteristics of the base layer 38 are separated and evaluated.
The evaluation device 30 can obtain a light distribution image reflected and scattered from each of the coating layer 36 and the base layer 38 by calculating using the acquired image data of the first image and the second image. it can. Furthermore, the evaluation apparatus 30 converts the light distribution image of each layer of the coating layer 36 and the base layer 38 into a characteristic value that can represent the optical characteristic of each layer, for example, a luminance value, and generates a profile of the optical characteristic value such as a luminance profile. Can be sought.
That is, the evaluation device 30 calculates the respective optical profiles of the coating layer 36 and the base layer 38 by calculating the luminance profiles obtained by image analysis of the acquired image data of the first image and the second image. Can be evaluated separately.

Specifically, the evaluation device 30 determines the brightness of the image data of the first image representing the light distribution including the distribution of the surface reflection light of the coating layer 36 and the distribution of the internal reflection light of the base layer 38 in a spatially separated state. A luminance profile can be obtained by converting to a value. The brightness profile YA thus obtained is shown in FIG.
The brightness profile YA shown in FIG. 5 is different from the measurement system shown in FIG. 1 by changing the types of foundations (six types of FD1 to FD6) that are the coating materials of the coating layer 36 of the three-layer structure 22. This was obtained from the measurement result of the laminated structure 22 of FIG.
The brightness profile YA shown in FIG. 5 shows the brightness peak (1) of the internally reflected light of the base layer 38 (skin replica) obtained by measuring the six types of the laminated structure 22 having a three-layer structure, and the surface of the coating layer 36. It shows that the luminance peak (2) of the reflected light is spatially separated.

Further, the evaluation device 30 can obtain a luminance profile by converting the image data of the second image representing only the distribution of the surface reflected light of the coating layer 36 into a luminance value. The brightness profile YB thus obtained is shown in FIG.
The brightness profile YB shown in FIG. 6 is the same as the measurement system shown in FIG. 1 except that the types of foundations (six types FD1 to FD6) that are the coating materials of the coating layer 36 of the laminated structure 40 having the two-layer structure are changed. It is obtained from the result of measuring each laminated structure 40.
The luminance profile YA shown in FIG. 6 shows the luminance peak (2) of the surface reflected light of the coating layer 36 obtained by measuring the six types of laminated structures 40 in the same manner. It can be determined as one of the optical characteristics.

The evaluation apparatus 30 obtains the brightness profile YA (the brightness peak (1) of the internal reflection light of the base layer 38 and the brightness peak (2) of the surface reflection light of the coating layer 36 obtained in this manner as shown in FIG. And the difference (YA−YB) between the brightness profile YB shown in FIG. 6 (including only the brightness peak (2) of the surface reflected light of the coating layer 36) and six types of foundations (FD1 to FD6). Thus, the luminance profile shown in FIG. 7 including only the luminance peak (1) of the internally reflected light of the base layer 38 can be obtained as one of the optical characteristics of the base layer 38 for each foundation.
In the case of the prior art in which the coating layer 36 is formed directly on the base layer 38 without using the transparent substrate 32 in the laminated structure 22, as shown in FIG. 8, the brightness of the internally reflected light of the base layer 38. Since the peak (1) and the luminance peak (2) of the surface reflected light of the coating layer 36 are overlapped, the luminance profile of the coating layer 36 and the luminance profile of the base layer 38 cannot be separated. The optical characteristics of the coating layer 36 and the optical characteristics of the base layer 38 cannot be evaluated separately.

The evaluation device 30 uses the luminance profile (YA-YB) shown in FIG. 7 and the luminance profile YB shown in FIG. 6 obtained in this way, with the change rate of each luminance profile curve, the skirt width of the luminance peak, and the luminance profile curve. Optical characteristics can also be evaluated using the enclosed area, peak luminance value, and the like as indices.
When a white light source is used as the light source 12, the optical characteristics for each RGB color can be evaluated by performing RGB decomposition on the obtained image by image processing.

The measurement system, the measurement apparatus, and the measurement laminated structure according to the present invention are basically configured as described above, but the present invention is a method for measuring optical characteristics of a coating material applied on a base layer. Can also be done.
In the measurement method of the present invention, first, in the measurement system 10 shown in FIG. 1, a coating material such as a foundation is applied on the adhesive layer 34 on one surface of the transparent substrate 32 to form the coating layer 36, and the other The base layer 38 is brought into close contact with the surface to form the laminated structure 22 having a three-layer structure shown in FIG. 2, which includes the coating layer 36, the transparent substrate 32, and the base layer 38.

Next, a part of the laminated structure 22 thus formed is irradiated with slit light emitted from the light source 12 and narrowed down by the slit plate 16.
Next, the distribution of light reflected by the coating layer 36 of the multilayer structure 22 from the direction inclined by a predetermined angle with respect to the incident direction in which the narrowed slit light is incident on the multilayer structure 22, the coating layer 36, and the transparent The distribution of light transmitted through the substrate 32 and reflected by the base layer 38 of the laminated structure 22 is separated and photographed as a first image.

Further, a coating material is applied on the adhesive layer 34 of the transparent substrate 32 to form a coating layer 36, thereby forming the two-layered laminated structure 40 shown in FIG. 3 that includes the coating layer 36 and the transparent substrate 32. .
A part of the formed laminated structure 40 is irradiated with slit light emitted from the light source 12 and narrowed down by the slit plate 16.
Subsequently, the distribution of light reflected by the coating layer 36 of the laminated structure 40 is photographed as a second image.
The distribution of light transmitted through the coating layer 36 and the transparent substrate 32 and reflected by the base layer 38 of the laminated structure 22 is obtained from the photographed first image and second image, and the optical characteristics of the coating layer 36 and the base layer 38 are obtained. Are evaluated separately.
Thus, the measurement method of the present invention can be performed.

In addition, in the prior art, the reflection in each layer of the cosmetic layer (coating layer) and the skin layer (base layer), which is a very important item for the finish, is easily separated from the light reflection of the skin coated with cosmetics. Since it was difficult to evaluate light reflection, it was very difficult to quantitatively set and develop a performance target value for cosmetics.
On the other hand, in the present invention, it is possible to separate the surface reflected light of the applied product such as cosmetics and the scattered / reflected light on the skin, and the optical characteristics of each layer can be individually evaluated. Therefore, research and development of cosmetics and skin care products can be supported by using the method of the present invention.

Moreover, in this invention, in order to apply | coat to the transparent glass plate used as a transparent substrate, the measurement by other measuring apparatuses, such as the transmittance | permeability of a foundation thin film, can be performed with the same sample by removing a glass plate from skin. Moreover, since it can be removed, it is possible to make a comparison (comparison between people with different skins) when the underlying human skin or skin replica is changed.
Furthermore, in this invention, since foundation | substrate is apply | coated to the transparent flat plate which is a transparent substrate, it becomes easy to confirm a coating nonuniformity during application | coating. Further, in the present invention, the coating operation can be controlled so as not to cause coating unevenness, and it is possible to produce a laminated structure sample coated uniformly so that quantitative comparison can be made.

  As mentioned above, although the measuring system, measuring method, measuring apparatus, and laminated structure of the optical property of the coating material of the present invention have been described in detail, the present invention is not limited to the above-described embodiment, and the gist of the present invention. Various modifications and changes may be made without departing from.

The present invention predicts the effects of basic cosmetics, makeup cosmetics, and the like, and supports research and development by separating and analyzing the optical characteristics of a multilayer structure including scattering media such as skin and cosmetics.
In addition to the skin, the present invention can also be applied to analysis of printed matter printed with ink on paper, a laminated structure including a scattering layer such as a coating film, and the like.

DESCRIPTION OF SYMBOLS 10 Measuring system of optical characteristic of coating material 12 Light source 14, 18, 20, 26 Condensing lens 16 Slit plate 22, 40 Laminated structure 24 Support member 24
28 CCD camera 30 Evaluation device 32 Transparent substrate 34 Adhesive layer 36 Coating layer 38 Base layer 42 Slit-shaped irradiation light 44 Slit-shaped transmitted light 46 Internal scattered reflected light

Claims (13)

A system for measuring the optical properties of a coating material applied on a base layer,
A transparent substrate having an adhesive layer for forming a coating layer coated with the coating material on one surface, and the base layer in close contact with the other surface;
A light irradiation unit that emits irradiation light toward a first laminated structure having a three-layer structure of the coating layer, the transparent substrate, and the base layer, the base layer being formed in close contact with the other surface of the transparent substrate. When,
An optical system for squeezing the irradiation light emitted from the light irradiation unit and irradiating a part of the first laminated structure with the narrowed light;
The narrowed light is arranged to be inclined with respect to the incident direction in which it enters the first laminated structure, and is reflected by the coating layer of the first laminated structure from the direction inclined with respect to the incident direction. And a photographing unit that separates the distribution of the light and the distribution of the light that is transmitted through the coating layer and the transparent substrate and reflected by the base layer of the first laminated structure, and captures a first image. Characteristic measurement system. The light irradiation unit is further formed on a part of the second laminated structure of the two-layer structure of the coating layer and the transparent substrate formed by applying the coating material on one surface of the transparent substrate. It irradiates a narrowed light,
The photographing unit further photographs a light distribution reflected by the coating layer of the second laminated structure as a second image.
Further, from the first image and the second image photographed by the photographing unit, the distribution of light transmitted through the coating layer and the transparent substrate and reflected by the base layer of the first laminated structure is obtained. The measurement system according to claim 1, further comprising: an evaluation unit that separates and evaluates optical characteristics of the coating layer and the base layer.   The measurement system according to claim 1, further comprising: a fixing unit that fixes the first stacked structure so that the imaging unit and the first stacked structure are arranged to be inclined. The coating material is a foundation for applying to human skin, and the coating layer is a foundation layer coated with a foundation,
Furthermore, the base layer includes a scatterer and an absorber, and has a skin replica that simulates human skin,
The measurement system according to any one of claims 1 to 3, wherein the transparent substrate and the skin replica constitute a laminated structure in close contact with each other through matching oil.   The said application | coating material is a foundation for apply | coating to human skin, The said application layer is a foundation layer by which the foundation was apply | coated, The said base layer is human skin, The any one of Claims 1-4 The described measuring system. A method for measuring optical properties of a coating material applied on a base layer,
A coating layer is formed by coating the coating material on the adhesive layer on one side of the transparent substrate, and the base layer is adhered to the other side to form a three-layer structure of the coating layer, the transparent substrate, and the base layer. Forming a first laminated structure of
Irradiating light focused on a part of the formed first laminated structure;
The distribution of light reflected by the coating layer of the first multilayer structure from the direction inclined with respect to the incident direction in which the narrowed light is incident on the first multilayer structure, and the coating layer and the transparent A measurement method, wherein a first image is captured by separating a distribution of light transmitted through a substrate and reflected by the base layer of the first laminated structure. Furthermore, the coating material is applied on the adhesive layer of the transparent substrate to form the coating layer, thereby forming the coating layer and a second laminated structure having a two-layer structure of the transparent substrate,
Irradiating light focused on a part of the formed second laminated structure;
Taking a distribution of light reflected by the coating layer of the second laminated structure as a second image,
From the photographed first image and the second image, the distribution of light transmitted through the coating layer and the transparent substrate and reflected by the base layer of the first laminated structure is obtained, and the coating layer, and the The measurement method according to claim 6, wherein the optical properties of the base layer are separated and evaluated. The coating material is a foundation for applying to human skin, and the coating layer is a foundation layer coated with a foundation,
Furthermore, the base layer includes a scatterer and an absorber, and has a skin replica that simulates human skin,
The measurement method according to claim 6 or 7, wherein the transparent substrate and the skin replica constitute a laminated structure in close contact with each other through matching oil.   The said application | coating material is a foundation for apply | coating to human skin, The said application layer is a foundation layer by which the foundation was apply | coated, The said base layer is human skin, The any one of Claims 6-8 The measuring method described. An apparatus for measuring the optical properties of a coating material applied on a base layer,
A first layer of a three-layer structure of the coating layer, the transparent substrate, and the base layer formed by coating the coating material on the adhesive layer on one side of the transparent substrate and closely contacting the base layer on the other side A fixing portion for fixing the structure and the second laminated structure of the two-layer structure of the transparent substrate formed by applying the coating material on one surface of the transparent substrate; and
A light irradiation unit that emits irradiation light toward the first stacked structure and the second stacked structure fixed to the fixing unit;
An optical system for squeezing the irradiation light emitted from the light irradiation unit and irradiating the narrowed light to a part of the first stacked structure and the second stacked structure;
The narrowed light is arranged so as to be inclined with respect to the incident direction in which the light is incident on the first laminated structure fixed to the fixing portion, and the first laminated structure is inclined from the inclined direction with respect to the incident direction. The light distribution reflected by the coating layer of the body and the light distribution transmitted through the coating layer and the transparent substrate and reflected by the base layer of the first laminated structure are separated and photographed as a first image, A photographing unit for photographing a distribution of light reflected by the coating layer of the second laminated structure fixed to the fixing unit as a second image;
A distribution of light transmitted through the coating layer and the transparent substrate and reflected by the base layer of the first laminated structure is obtained from the first image and the second image photographed by the photographing unit, and the coating is performed. And an evaluation unit that separates and evaluates optical characteristics of the base layer. The coating material is a foundation for applying to human skin, and the coating layer is a foundation layer coated with a foundation,
Furthermore, the base layer includes a scatterer and an absorber, and is a skin replica that simulates human skin,
The measuring apparatus according to claim 10, wherein the transparent substrate and the skin replica constitute a laminated structure in close contact with each other through matching oil.   The measuring apparatus according to claim 10 or 11, wherein the application material is a foundation for applying to human skin, the application layer is a foundation layer to which a foundation is applied, and the base layer is human skin. In order to measure the optical characteristics of the coating material applied on the human skin, the coating material is applied to the laminated structure used for photographing,
A transparent substrate comprising an adhesive layer for forming a coating layer coated with the coating material on one surface;
A skin replica that simulates human skin, including a scatterer and an absorber, and is in close contact with the other surface of the transparent substrate;
Matching oil inserted between the transparent substrate and the skin replica, reducing reflection of light at the interface between the transparent substrate and the skin replica, and bringing the transparent substrate and the skin replica into close contact with each other. A laminated structure characterized by the above.

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