TW202206860A - Surface color change method including laminating a photochromic substance on the surface - Google Patents

Abstract

An object of the present invention is to reversibly change a color on a surface of an object using a photochromic substance. A photochromic substance (3) is laminated on a surface portion (1) of an object. The surface of the laminated photochromic substance (3) is irradiated with lights (5) in the ultraviolet wavelengths to cause the photochromic substance (3) changes its color based on a photochromic mechanism. In addition, a wavelength cut-off agent (4) that can block wavelengths of the ultraviolet contained in natural light and illumination light is coated on the laminated photochromic substance (3).

Description

How to discolor the surface

In the present invention, a photochromic compound is used for the color of all or a part of the surface (hereinafter referred to as a surface portion) of an object having a planar surface, and light of a wavelength that produces photochromic is used for the photochromic compound. A method of reversibly discoloring it.

In the past, techniques for coloring the surface of an object having a planar surface such as nails (including nail patches, the same applies hereinafter) and handbags by photochromism are known from Patent Documents 1, 2 and the like.

Regarding organic electrochromic compounds, the electrical control of vivid color-developing reactions such as CMY (cyan, magenta, yellow) has been successful, but if the power supply is stopped, the original color will return to the original color in a short time. In addition, the development of organic and inorganic hybrid (mixed) electrochromic compounds is also underway, but if the power supply is stopped, the discoloration state can only be maintained for a period of time, and the original color cannot be restored continuously. The electrochromic materials are the same. Therefore, it is not suitable for a utilization method in which the color of a product (object) is changed and kept in this state for a long time. In addition, according to the color change of the planar portion of the conventional electrochromic compound, an electrical system such as a power source is indispensable in order to electrically control the color-developing reaction, which unfortunately lacks universality.

However, a phenomenon in which a single compound reversibly produces two isoforms (A, B) with different colors without changing the molecular weight when exposed to light is a known photochromic mechanism. A photochromic material with a photochromic mechanism is a compound whose color changes reversibly when irradiated with light of a specific wavelength. Among them, "solid polychromatic photochromism" using a silver compound is a process in which the solid changes color to the color corresponding to the wavelength of the irradiated light when the solid is irradiated with light of a specific wavelength, and the light outside the ultraviolet region returns to the original color. reversible phenomenon. By the way, there is a single compound in which three compounds with very similar chemical structures and different molecular states are mixed from colorless to blue (1a), red (2a), and yellow (3a) when irradiated with light of a specific wavelength. Crystalline (mixed crystal) photochromic compounds. This photochromic compound emits blue/red/yellow when irradiated with light of a specific wavelength, and further analysis of the polarized light absorption spectrum confirms that the three-component photochromic reaction (photochromic mechanism) is maintained in a crystalline state. . This photochromic compound is a single crystal of diarylene, and even a single crystal can exhibit a polychromatic photochromic mechanism of reversibly changing into various colors. In addition, the photochromic reaction of vinylidene is affected by the wavelength of a narrow band in the ultraviolet region and changes color, and the discolored color has the characteristic that it is easy to return to the original color by the light of the wavelength of the visible light region.

On the other hand, in the field of photosensitive materials for photographs such as silver halide color photographs (silver halide photographic photographic materials, etc.), it is an issue to improve the light fastness of the material, so the density caused by exposure to light such as natural light is reduced (photosensitive materials, etc.). Discoloration mechanism = photochromic reaction) is regarded as a negative phenomenon, and various research and development are carried out in order to suppress this phenomenon. For example, a wavelength cutoff agent that can block specific wavelengths manufactured by Fuji Film Co., Ltd. can selectively block (block) specific wavelengths of specific unwanted wavelengths for the purpose of preventing fading/color reproducibility of silver salt photographs. The wavelength cut-off agent is sold in the market under the trade name of "COMFOGUARD". This wavelength cut-off agent can adjust the wavelength of light to be cut off in units of 20 nm, and can freely select the wavelength range to be cut off between the ultraviolet region and the infrared region according to needs.

The inventors of the present application have paid attention to the characteristics of the photochromic material that the aforementioned photochromic compound containing diarylidene reversibly changes color when it receives light in a specific band, and that it can cut off any arbitrary color between the ultraviolet region and the infrared region. The function of the wavelength cut-off agent to obtain the color of the photochromic material that makes the color change the target color, and the idea that when a wavelength cut-off agent that cuts the wavelength of the desired band is used, it can be maintained under natural light for a desired time. . For example, when an object whose surface is covered with a specific photochromic compound is irradiated with light in the ultraviolet region of a specific wavelength that can generate a photochromic mechanism, the color of the surface of the object can be changed to a desired color. In order to maintain the color after discoloration, if the surface of the object is covered with a wavelength-cutting agent that blocks wavelengths included in the ultraviolet region of natural light, the changed color can be maintained for a desired time and fading of the color can be suppressed.

The inventors of the present application have further focused on vinylidene, although it is easily affected by the wavelength of the ultraviolet region, on the other hand, it is not easily affected by the wavelength of the visible light region, and the surface of the object (surface part of the product) Covering with vinylene, irradiating the surface of the vinylaryne with light in the ultraviolet region to discolor the vinylidene to the desired color, and then applying a wavelength cutoff agent that cuts the wavelength of the ultraviolet region included in the natural light on the surface. By coating, it is possible to cut off the wavelength of the ultraviolet region contained in natural light and maintain the color after the aforementioned discoloration for a certain period of time. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2017-153784 [Patent Document 2] Japanese Patent Laid-Open No. 2018-187106

[The problem to be solved by the invention]

A first object of the present invention is to provide a surface that covers all or a part (hereinafter, referred to as a surface portion) of an object with a photochromic substance (hereinafter, also referred to as a photochromic compound or a photochromic material), A discoloration method in which the surface portion is irradiated with light of a specific wavelength to change the color of the surface portion, and the discolored surface portion is irradiated with light (wavelength) other than the specific wavelength to return to the original color.

The second object of the present invention is to provide a method for maintaining the discolored color for a certain period of time after deliberately discoloring the surface portion to a desired color (target color) by utilizing the photochromic properties of vinylidene. [Means for solving problems]

The structure of the first invention, which aims to solve the above-mentioned first problem, is that a photochromic substance is laminated on the surface of an object by a method such as coating, and then the surface of the laminated photochromic substance is irradiated with light in the ultraviolet region. The aforementioned photochromic substances are made to change color by a photochromic mechanism. When irradiating the light in the above-mentioned ultraviolet region, it is coated with a wavelength cut-off agent that can block the wavelengths of natural light and illumination light including ultraviolet rays.

The structure of the second invention which can solve the second problem is characterized in that a diarylidene is laminated on the surface of the object as a photochromic substance by a method such as coating, and a specific wavelength is irradiated on the surface of the laminated diarylene. After the color of the above-mentioned diarylidene is changed to the target color by the light of the above-mentioned light, the discolored surface is covered with a wavelength cut-off agent that can block the wavelength of the ultraviolet region contained in natural light or illumination light, so as to make the above-mentioned discolored state. keep for a certain period of time. Hereinafter, the "present invention" in this specification includes the concepts of the first invention and the second invention described above.

As the photochromic substance laminated on the surface portion, there is an organic photochromic compound that changes into a color corresponding to the visible light region of the specific wavelength when irradiated with light of a specific wavelength. The organic photochromic compound is exemplified by single-crystal diarylene having organic molecules with three structures. The aforementioned diarylidene emits red with light of 370 nm in the ultraviolet region, yellow with light of 380 nm, and blue with light of 405 nm, and light with wavelengths above 450 nm in the visible light region causes discoloration to return to its original color. In addition, the wavelengths in the ultraviolet region of the optical system of 370 nm, 380 nm, and 380 nm mentioned above are in the vicinity of the visible light region.

In addition, in the present invention, as the photochromic compound, an inorganic photochromic compound such as titanium oxide supporting silver (Ag) nanoparticles can be used. The inorganic photochromic compound is laminated on the surface of the object, and then the surface of the laminated photochromic material is irradiated with light of an arbitrary color (target color) wavelength in the visible light region to change the surface color of the surface to irradiate The color of light (target color) can be used to change the color of the surface of an object in a state where the discolored surface is coated with a wavelength-cutting agent that blocks the wavelength of natural light including ultraviolet rays.

Inorganic photochromic compounds that change to this color when illuminated by light of a specific wavelength in the visible region. Therefore, the wavelength cutoff agent used in the case where the wavelength cutoff agent is pre-coated on the surface of the inorganic photochromic compound is to cut off the wavelength of the natural light including ultraviolet rays in the visible light region for discoloration except for the light of the specific wavelength to be irradiated. cut-off agent.

The surface parts to which the present invention can be applied include nails with colored surfaces, artificial nails, lips, body hair containing hair, glasses, watches, jewelry products including rings, bracelets, necklaces, etc. (hereinafter referred to as jewelry products), bags Classes, boots, fibrous products including ties, scarves, handkerchiefs, natural or chemical fibers, vehicle bodies including locomotives or automobiles, wall coverings, interior fittings including furniture, exterior fittings including billboards, construction All or part of any surface portion of the roof, floor, and wall including side walls.

In the implementation of the first invention, a surface portion on which a photochromic substance is laminated is prepared on the surface portion of an object, and a light irradiation means is prepared to irradiate the surface portion with light having a wavelength of an arbitrary specific region. Next, light of a specific wavelength in the ultraviolet region is irradiated to the surface portion by the light irradiation means to cause photochromism to the photochromic substance, and the color of the surface portion is changed to a desired color. In the implementation of the second invention, diarylidene is prepared as a photochromic substance, and this is laminated on the surface of the object by a method such as coating, and the surface of the laminated diarylidene is irradiated with light of a specific wavelength in the ultraviolet region. Discoloration of the color of the aforementioned vinyl arylate is the target color. If the surface of the discolored surface is covered with a wavelength cut-off agent capable of blocking specific wavelengths in the ultraviolet region, the color of the discolored surface can be maintained for a certain period of time.

The aforementioned photochromic substance is an organic photochromic compound, such as diarylidene, when irradiated with light of a specific wavelength in the ultraviolet region, it will change color to a color corresponding to the visible light region of the specific wavelength irradiated, and the visible light region above 450nm is irradiated. When the wavelength of light returns, it returns to its original color properties. Here, the aforementioned vinylidene has photochromism (forward discoloration) caused by light of wavelengths in the ultraviolet region, and photochromism in which the discolored surface receives light of wavelengths in the visible light region and returns to its original color (reverse discoloration) characteristics, so by using a wavelength cut-off agent in the ultraviolet region, the forward discoloration vector and the reverse discoloration vector are antagonistic, and the fading of the discoloration target color can be prevented.

The above-mentioned light irradiation means may be provided with means capable of irradiating light of a specific wavelength which can be arbitrarily selected from a wavelength region ranging from an ultraviolet region to an infrared region. In addition, as a wavelength cut-off agent that cuts off a specific wavelength, a wavelength cut-off agent capable of adjusting the cut-off wavelength in units of 20 nm is used.

The discoloration method of the surface part according to the present invention can be applied as a new exterior decoration method for the surface part of a three-dimensional object such as an automobile body, which replaces the conventional exterior decoration methods such as painting and polishing. A specific example of the method is as follows.

That is, according to the first invention, a photochromic compound can be coated on the surface of a three-dimensional object such as a car body, and the surface of the coating layer can be scanned with a three-dimensional space scanner to obtain three-dimensional space scan data and model. The shape of the object is analyzed. A pre-selected graphic pattern is mapped to the aforementioned object after modeling analysis. Simultaneous with or after the above-mentioned mapping, the object to be mapped is irradiated with light of a specific wavelength in the ultraviolet region to change the color of the photochromic compound applied to the object, so that a 3-dimensional object can be imparted. A graphic pattern is used to change the color of the object to the target color. To restore the changed color, the original color is restored by irradiating light in the visible light region above 450 nm.

In the second invention, a photochromic compound can be coated on the surface of a 3-dimensional object, and the surface of the 3-dimensional object with the coating layer can be scanned with a three-dimensional space scanner to obtain three-dimensional space scanning data, and the 3-dimensional space can be modeled and analyzed. The shape of a dimensional object. A pre-selected graphic pattern is mapped to the 3-dimensional object after modeling analysis. At the same time as the above-mentioned mapping, or after the above-mentioned mapping, the object to be mapped is irradiated with light of a specific wavelength in the ultraviolet region, so that the color of the photochromic compound applied to the third-dimensional object is changed to the target color, and It is coated with a wavelength cut-off agent that can cut off ultraviolet rays contained in natural light. Thereby, the photochromic state can be maintained for a predetermined period of time.

As described above, according to the present invention, a graphic pattern can be given to a 3-dimensional object to change the color of the object. To restore the changed color, the original color is restored by irradiating visible light above 450 nm. In order not to return to the original color, a wavelength cut-off agent with a wavelength of 450 nm or more in the visible light region can be applied to the discolored object. As 3-dimensional objects, in addition to the aforementioned car body, there are also, for example, nails, false nails, lips, hair, eyebrows, beards, glasses, watches, jewelry products including rings, bracelets, necklaces, etc. (hereinafter referred to as jewelry products). , handbags, boots, fiber products including ties, scarves, handkerchiefs, natural fibers or chemical fibers, locomotive bodies, wall materials, indoor installations including furniture or furnishings, outdoor installations including advertising billboards, buildings roofs, floors, walls including side walls, etc.

The light in the ultraviolet region used in the present invention can be classified according to wavelength, and can be divided into near ultraviolet (near UV) with wavelength of 380-200 nm, far ultraviolet or vacuum ultraviolet (farUV (FUV) or vacuumUV (VUV)) with wavelength of 200-10 nm, Extreme ultraviolet or extreme ultraviolet (extremeUV, EUVorXUV) with a wavelength of 121-10nm. In addition, from the viewpoint of human health or environmental impact, near-ultraviolet rays can be further classified into UVA (400-315 nm), UVB (315-280 nm), and UVC (less than 280 nm). In addition, in photolithography or laser technology, deep UV (DUV) refers to ultraviolet rays with a wavelength of 300 nm or less, which is different from the aforementioned FUV. Sunlight includes ultraviolet rays with wavelengths of the aforementioned UVA, UVB, and UVC, among which UVA and UVB pass through the ozone layer to reach the surface. However, UVC is heavily absorbed by substances and generally cannot pass through the atmosphere. 99% of the ultraviolet rays reaching the surface are UVA (also, some UVC is generated by the reaction of the ozone layer).

In the present invention, the vinylidene coated on the surface of the product will simultaneously emit three primary colors of blue-green, magenta and yellow when it receives wavelengths in the ultraviolet region by means of light irradiation, so the surface of the product is black. Then, by controlling the light irradiation output and time of a specific wavelength of light in the visible light region for fading each of the emitted three primary colors, the intended emission color tone is made. On the other hand, in the present invention, a wavelength cut-off agent capable of cutting off a large amount of UVA (400-315 nm) contained in natural light is applied to the aforementioned diarylidene. Therefore, the wavelength of the ultraviolet region irradiated to the vinylidene by the light irradiation means hardly includes specific wavelengths such as UVB (315 to 280 nm) and UVC (less than 280 nm) in natural light. Here, increasing the output of the light irradiation means can supplement the color development of the maximum density. The present invention uses a wavelength cut-off agent that can block a lot of UVA contained in natural light for the color development of vinylidene, so the color development is not affected by ultraviolet rays contained in natural light, but only affected by fading changes caused by visible light. Fading caused by visible light takes minutes to hours. In the present invention, the black color generated by the instantaneous three primary colors caused by the irradiation of the ultraviolet region wavelength of vinylidene and the light in the visible region of a specific wavelength are utilized to irradiate the black color tones, and the UVA-cutting wavelength cut-off agent Use only visible light that is not affected by ultraviolet light to cause gentle fading, and any color of the color can be maintained for a certain period of time under natural light or illumination light.

Next, referring to the drawings, a pattern example for implementing the method of the present invention will be described. FIG. 1 illustrates an example of applying the present invention to changing the color of nails, 1 is a human finger, and 2 is a nail fitted on the finger. The nail 2 may be formed by applying an organic photochromic compound as a photochromic material to a nail (false nail) made of plastic or the like, or by forming an organic photochromic compound into a nail shape.

The nail 2 in the step of FIG. 1( a ) is coated on the photochromic material 3 with a wavelength cut-off agent 4 that blocks a specific wavelength in the ultraviolet region. The nail 2 attached to the finger of the finger 1 is irradiated with light 5a in the ultraviolet region different from the specific wavelength by the light irradiating means 5 in the next step (b). In FIG. 1, reference numeral 6 is a light source control unit that selects a plurality of specific wavelengths in the ultraviolet region to be irradiated by the light irradiation means 5 in accordance with the color to be changed, and wirelessly supplies the light irradiation means with a command for irradiating the selected specific wavelengths. control signal. For example, the color of the nail 2 can be developed by irradiating light of 370 nm in the case of the target color red, light of 380 nm in the case of the target color yellow, and light of 405 nm in the case of the target color blue. ) for various purposes. The coating of the wavelength cut-off agent 4 for cutting off wavelengths in the ultraviolet region other than the wavelengths irradiated in the above can be performed by irradiating the photochromic material 3 with light of the wavelength of the desired color by the light irradiation means 5 to change the color. After the discoloration of the material 3 becomes the target color, the aforementioned wavelength cut-off agent 4 is applied. The coating time of the wavelength cut-off agent 4 may be after the photochromic material 3 is discolored in the following examples, which is the same as the previous example. The wavelength to be cut by the aforementioned wavelength cut-off agent 4 is a wavelength of 400 nm to 280 nm contained in natural light, preferably at least a wavelength of 400 nm to 315 nm. In addition, the term ultraviolet or ultraviolet wavelength in this specification is used as a synonym with the wavelength in the ultraviolet region.

The light irradiation means 5 shown in FIG. 1 is a built-in battery for the power source, a luminous body for the light source, and a control board. In addition, when the photochromic material 3 is changed to an inorganic type of the color of the irradiated light, a color filter is placed in front of the light source. In the case where a pattern such as a pattern is reproduced on the nail 2, a drawing board made of liquid crystal or the like is placed in front of the light source.

The photochromic material 3 of the nail 2 irradiated with the light 5a of the specific wavelength changes to a color corresponding to the wavelength of the visible light region of the specific wavelength irradiated. For the changed color, since the surface of the photochromic material 3 is coated with a wavelength cut-off agent 4 that can cut off ultraviolet rays contained in natural light, the ultraviolet rays are cut off and the changed color does not fade within a certain period of time (refer to step (c)).

Next, referring to FIGS. 2 and 3 , an application example of the combination of the color changing method of the present invention and the mapping of the graphic pattern to the vehicle body will be described.

FIG. 2 is a conceptual diagram of a case where the discoloration method of the present invention is applied to an automobile body. In FIG. 2 , the photochromic material 11 is applied to the vehicle body 10 . For this purpose, a portable dedicated device (hereinafter, referred to as rewritable) is used that has a three-dimensional space scanning function and a projection mapping function, and irradiates light of a specific wavelength that changes the color or pattern of the object (vehicle body 10 ). Amplifier (rewritable･booster) 13). Thereby, the color or graphic design of the automobile body 10 can be changed instantaneously according to the scenery, season, or the mood of the day, etc., which can save a lot of time and cost compared with the previous painting or polishing, etc. Huge user benefit. The foregoing example will be explained in step order according to FIG. 3 . In addition, the coating of the ultraviolet wavelength cut-off agent 12 is performed after discoloring the photochromic material 11 by the light irradiation of the rewritable amplifier 13 .

Step 1, scan the vehicle body 10 in three-dimensional space. That is, the scanning laser beam 13 a is irradiated on the automobile body 10 by the rewritable amplifier 13 and surrounds the automobile to scan the entire automobile body 10 .

In step 2, based on the scan data obtained in step 1, a dedicated application program is used to instantaneously model and analyze 10a the body shape of the vehicle body 10 to create mapping data 13b of preselected graphic patterns 14.

In step 3, the rewritable amplifier 13 is used to irradiate the car body 10 with light of a specific wavelength in the ultraviolet region while surrounding the car. Thereby, the photochromic material 11 on the surface of the automobile body 10 is changed to a specific color, and the graphic pattern 14 based on the mapping data 13b is drawn (mapped) on the automobile body 10 .

As described above, according to the present invention, the desired graphic pattern can be mapped while the color of the automobile body 10 is changed to the intended color, so that the time required for the vehicle body painting or graphic mapping according to the conventional method can be greatly reduced with energy

The aforementioned benefits can be enjoyed not only by car users but also by car dealers. That is, this is because by applying the method of the present invention to a car displayed in a store, one car can be displayed in a variety of colors or graphics.

The present invention described above can be applied to nails, artificial nails, lips, body hair including hair, glasses, watches, jewelry products including rings, bracelets, necklaces, etc., bags, boots, ties, scarves, etc., as objects. Fiber products of handkerchiefs, natural or chemical fibers, vehicle bodies including locomotives or automobiles, wall covering materials, interior fittings including furniture or furnishings, exterior fittings including advertising billboards, building roofs, floors, including side walls, etc.

1: finger 2: Nails (false nails) 3: Photochromic material 4: wavelength cut-off agent 5: Light irradiation means 6: Light source control section

Fig. 1 is an explanatory diagram schematically showing a state in which the discoloration method of the present invention is applied to nails (nails, artificial nails). FIG. 2 is an explanatory diagram schematically showing a state in which the discoloration method of the present invention is applied to an automobile. Fig. 3 is a step diagram illustrating a pattern of the steps of the combination of the color changing method of the present invention and the mapping of the graphic pattern to the vehicle body.

1: finger

2: Nails (false nails)

3: Photochromic material

4: wavelength cut-off agent

5: Light irradiation means

5a: Light

6: Light source control section

Claims (17)

A method for discoloration of the surface part, which comprises layering a photochromic substance on the surface part of an object, and irradiating the surface of the layered photochromic substance with light in the ultraviolet region to change the color of the photochromic substance by a photochromic mechanism. In the case of discoloration, a wavelength-cutting agent capable of blocking wavelengths in the ultraviolet region contained in natural light or illuminating light is applied to the surface of the laminated photochromic material before irradiating the light in the ultraviolet region. A method for discoloration of the surface part, which comprises layering a photochromic substance on the surface part of an object, and irradiating the surface of the layered photochromic substance with light in the ultraviolet region to change the color of the photochromic substance by a photochromic mechanism. When it is discolored, a wavelength cut-off agent that can block the wavelength of the ultraviolet region contained in natural light or illumination light is applied to the laminated light after the photochromic substance is discolored by irradiating the light in the ultraviolet region. surface of the color-changing substance. The discoloration method of the surface part of claim 1 or 2, wherein a wavelength cut-off agent is applied on the photochromic substance in such a manner that the light quantity of the wavelength blocked by the wavelength cut-off agent is maintained for a certain period of time. The discoloration method of the surface part according to any one of Claims 1 to 3, wherein the wavelength of the ultraviolet region cut off by the wavelength cut-off agent is 400 nm to 280 nm, preferably 400 nm to 315 nm. The discoloration method of the surface part according to any one of claims 1 to 4, wherein the surface part discolored by the photochromic mechanism returns to the original color with the light irradiated in the visible light region. A method for discoloring a surface part, wherein a photochromic substance laminated on the surface part of any one of claims 1 to 5 changes to visible light corresponding to the specific wavelength of the irradiation when it is irradiated with light of a specific wavelength in the ultraviolet region Area-colored organic photochromic compounds. The method for discoloring the surface part according to claim 6, wherein the organic photochromic compound is a single crystal diarylene having three organic molecules with different structures. The method for discoloring the surface of any one of Claims 1 to 7, wherein the surface of the object includes: fingernails, false nails, lips, body hair containing hair, glasses, clocks, rings, bracelets, necklaces, etc. Jewelry products, handbags, boots, fiber products including ties, scarves, handkerchiefs, natural fibers or chemical fibers, vehicle bodies including motorcycles or automobiles, wall materials, interior fittings including furniture or furnishings, including advertisements An exterior installation of a signboard, a roof of a building, a floor, any surface portion of a wall including a side wall. A discoloration system for a surface part, comprising: a surface part on which a photochromic substance is laminated on a surface part of an object, an illuminating means formed so as to irradiate light in an ultraviolet region, and a surface part laminated with a photochromic substance on the opposite side. The wavelength cut-off agent that blocks the specific wavelength of the ultraviolet region by the surface portion of the radiator is driven before the illumination means is driven, and the wavelength cut-off agent is applied to the coating means of the surface portion coated with the photochromic substance; Light in the ultraviolet region is irradiated on the surface portion to cause the photochromic substance to photochromize, thereby changing the color of the surface portion. A discoloration system for a surface part, comprising: a surface part on which a photochromic substance is laminated on a surface part of an object, an illuminating means formed so as to irradiate light in an ultraviolet region, and a surface part laminated with a photochromic substance on the opposite side. The wavelength cut-off agent that blocks the specific wavelength of the ultraviolet region on the surface part is applied to the surface part after the aforementioned illumination means is driven and the aforementioned photochromic substance changes color by the photochromic mechanism; When light is irradiated on the surface portion, the photochromic substance is photochromic, and the color of the surface portion is changed. The discoloration system for the surface part of claim 9 or 10, wherein the photochromic substance changes color to a color corresponding to the visible light region of the irradiated specific wavelength when it is irradiated with light of a specific wavelength in the ultraviolet region, and irradiates the visible light region. Organic photochromic compounds that return the light to its original color. The discoloration system for the surface part of any one of claims 9 to 11, wherein the surface part of the object includes: fingernails, false nails, lips, body hair containing hair, glasses, clocks, rings, bracelets, necklaces, etc. Jewelry products, handbags, boots, fiber products including ties, scarves, handkerchiefs, natural fibers or chemical fibers, vehicle bodies including motorcycles or automobiles, wall materials, interior fittings including furniture or furnishings, including advertisements An exterior installation of a signboard, a roof of a building, a floor, any surface portion of a wall including a side wall. The discoloration system for the surface part according to any one of claims 9 to 12, wherein the illuminating means can irradiate light of a specific wavelength between the ultraviolet region and the infrared region. The discoloration system of the surface part according to any one of Claims 9 to 13, wherein the wavelength cut-off agent can adjust the cut-off wavelength in units of 20 nm. A method for changing the color of an object is to give a graphic pattern to a 3-dimensional object to change the color of the object, to coat the surface of the 3-dimensional object such as a car body with a photochromic compound, and to apply the above-mentioned object. Scanning the three-dimensional space scanning data with a three-dimensional space scanner, modeling and analyzing the shape of the object, mapping the pre-selected graphic pattern to the object of modeling analysis, at the same time as or after the aforementioned mapping, The object to be mapped is irradiated with light of a specific wavelength in the ultraviolet region to change the color of the photochromic compound applied to the object, and then a wavelength cut-off agent that cuts the ultraviolet wavelength is applied to the object. A method for changing the color of an object is to give a graphic pattern to a 3-dimensional object to change the color of the object, to coat the surface of the 3-dimensional object such as a car body with a photochromic compound, and to apply the above-mentioned object. Scanning the three-dimensional space scanning data with a three-dimensional space scanner, modeling and analyzing the shape of the object, mapping the pre-selected graphic pattern to the object of modeling analysis, at the same time as or after the aforementioned mapping, When the object to be mapped is irradiated with light of a specific wavelength in the ultraviolet region to change the color of the photochromic compound applied to the object, a wavelength cut-off agent that cuts the ultraviolet wavelength is applied before the photochromic compound changes color. on the aforementioned objects. According to the method of changing the color of the object of claim 15 or 16, the three-dimensional objects are: nails, false nails, lips, body hair with hair, glasses, watches, jewelry products including rings, bracelets, necklaces, etc., Bags, boots, fiber products including ties, scarves, handkerchiefs, natural fibers or chemical fibers, vehicle bodies including motorcycles or automobiles, wall materials, interior fittings including furniture or furnishings, and exterior installations including advertising billboards objects, roofs of buildings, floors, walls including side walls.

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