阅读说明：本技术 面状部的变色方法 (Method for changing color of planar part ) 是由 鲤渕道生 于 2020-02-19 设计创作，主要内容包括：使用光致变色物质可逆地改变对象物的表面的颜色。在对象物的面状部(1)层叠光致变色物质(3),接着向层叠的光致变色物质(3)的表面照射紫外区域的光(5)而使所述光致变色物质(3)以光色性进行变色时,用遮断包含自然光、照明光的紫外区域的波长的波长截取剂(4)覆盖所述层叠的光致变色物质(3)。(The color of the surface of the object is reversibly changed using a photochromic substance. When a photochromic substance (3) is laminated on a planar portion (1) of an object and then the surface of the laminated photochromic substance (3) is irradiated with light (5) in an ultraviolet region to cause the photochromic substance (3) to change color with photochromic properties, the laminated photochromic substance (3) is covered with a wavelength cut-off agent (4) for cutting off the wavelength of the ultraviolet region including natural light and illumination light.)

1. A method of changing color of a planar portion, characterized in that,

when a photochromic substance is laminated on a planar portion of an object and the surface of the laminated photochromic substance is irradiated with light in an ultraviolet region so that the color of the photochromic substance changes in a photochromic manner, a wavelength cut-off agent which cuts off the wavelength of the ultraviolet region included in natural light or illumination light is applied to the surface of the laminated photochromic substance.

2. The method of changing color of a planar portion according to claim 1,

the wavelength cut-off agent is applied to the surface of the laminated photochromic substance before the irradiation of the light in the ultraviolet region, or the wavelength cut-off agent is applied to the surface of the laminated photochromic substance after the irradiation of the light in the ultraviolet region and the discoloration of the photochromic substance.

3. The method of changing color of a planar portion according to claim 2,

the wavelength cut agent is coated on the photochromic substance so as to keep the quantity of light of the wavelength cut by the wavelength cut agent for a certain time.

4. The method of changing color of a planar portion according to any one of claims 1 to 3,

the wavelength of the ultraviolet region intercepted by the wavelength intercepting agent is 400nm to 280nm, preferably 400nm to 315 nm.

5. The method of changing color of a planar portion according to any one of claims 1 to 4,

the planar portion discolored by photochromism is irradiated with light in a visible region to restore the original color.

6. The method of changing color of a planar portion according to any one of claims 1 to 5,

the photochromic substance laminated on the planar portion is an organic photochromic compound which changes to a color in a visible region corresponding to a specific wavelength of irradiation when the photochromic substance is irradiated with light of the specific wavelength in an ultraviolet region.

7. The method of changing color of a planar portion according to claim 6,

the organic photochromic compound is single-crystal diarylethene with 3 organic molecules with different structures.

8. The method of changing color of a planar portion according to any one of claims 1 to 7,

the planar portion of the object is any planar portion of a nail, an artificial nail, a lip, body hair including hair, glasses, a timepiece, jewelry such as a ring, a bracelet, and a necklace, bags, shoes, fiber products including a tie, a scarf, and a handkerchief, natural fibers or chemical fibers, a body of a vehicle including a motorcycle or an automobile, a wall material, an indoor device including furniture or a placement, an outdoor device including a signboard, a ceiling of a building, a floor, and a wall surface including a side wall.

9. A system for changing color of a planar portion, comprising:

a planar part in which a photochromic substance is laminated on a planar part of an object; a light irradiation unit formed to be capable of irradiating light in an ultraviolet region; and a coating means for a wavelength cut-off agent for cutting off a specific wavelength in an ultraviolet region of a planar portion on which the photochromic substance is laminated,

the light irradiation means irradiates the planar portion with light in the ultraviolet region to cause the photochromic substance to generate photochromic properties, thereby changing the color of the planar portion.

10. The system of changing color of a planar portion according to claim 9,

the wavelength cut-off agent applying means is driven before the light irradiating means is driven, and applies the wavelength cut-off agent to the planar portion to which the photochromic substance is applied, or applies the wavelength cut-off agent to the planar portion after the light irradiating means is driven and the photochromic substance is changed in color by light.

11. The system for changing color of a planar portion according to claim 9 or 10,

the photochromic substance is an organic photochromic compound which, when irradiated with light of a specific wavelength in the ultraviolet region, changes color to a color in the visible region corresponding to the specific wavelength to be irradiated, and returns to the original color by irradiation with light in the visible region.

12. The system for changing color of a planar portion according to any one of claims 9 to 11,

the planar portion is any planar portion of a nail, an artificial nail, a lip, body hair including hair, glasses, a timepiece, jewelry such as a ring, a bracelet, and a necklace, bags, shoes, fiber products including a tie, a scarf, and a handkerchief, natural fibers or chemical fibers, a vehicle body including a motorcycle or an automobile, a material for a wall surface, an indoor device including furniture or a mounted object, an outdoor device including a signboard, a ceiling of a building, a floor, and a wall surface including a side wall.

13. The system for changing color of a planar portion according to any one of claims 9 to 12,

the light irradiation unit is capable of irradiating light of a specific wavelength from an ultraviolet region to an infrared region.

14. The system for changing color of a planar portion according to any one of claims 9 to 13,

the wavelength interceptor can adjust and intercept the intercepted wavelength in units of 20 nm.

15. A method for changing the color of a three-dimensional object by adding a graphic pattern to the object,

a photochromic compound is applied to the surface of a three-dimensional object such as an automobile body, the object is scanned by a 3D scanner to obtain 3D scanning data, the shape of the object is modeled and analyzed, a preselected pattern is mapped on the modeled and analyzed object, and at the same time as or after the mapping, the mapped object is irradiated with light of a specific wavelength in an ultraviolet region to change the color of the photochromic compound applied to the object.

16. The method of changing the color of an object according to claim 15,

after the photochromic compound coated on the object is photochromic, a wavelength intercepting agent for intercepting ultraviolet wavelength is coated on the object, or before the photochromic compound is photochromic, the wavelength intercepting agent for intercepting ultraviolet wavelength is coated on the object.

17. The method of changing the color of an object according to claim 16,

the three-dimensional object is a nail, an artificial nail, a lip, body hair including hair, glasses, a timepiece, a jewelry item including a ring, a bracelet, a necklace, or the like, a bag, a shoe, a fiber product including a tie, a scarf, a handkerchief, a natural fiber or a chemical fiber, a vehicle body including a motorcycle or an automobile, a material for a wall surface, an indoor device including furniture or a placement, an outdoor device including a signboard, a ceiling of a building, a floor, or a wall surface including a side wall.

Technical Field

The present invention relates to a method for reversibly changing the color of all or a part (hereinafter, referred to as a planar portion) of the surface of an object having a planar surface by using a photochromic compound and light having a wavelength at which the photochromic compound is photochromic.

Background

Conventionally, patent documents 1 and 2 and the like have known a technique of imparting color to the surface of an object having a planar surface, such as a nail (including an artificial nail, the same applies hereinafter), a bag or the like, by means of electrochromism.

The organic electrochromic compound is successfully electrically controlled for a clear color reaction of CMY (cyan, magenta, yellow), but when the electrification is stopped, it returns to the original color in a short time. In addition, although a hybrid (hybrid) electrochromic compound of organic and inorganic materials has been developed, the state of color change continues for a certain period of time when charging is stopped, and the color is restored, as in the known electrochromic material. Therefore, it is not suitable for use in changing the color of a product (object) and maintaining the state for a long time. Further, since the color reaction is electrically controlled by the change in color of the planar portion formed of a known electrochromic compound, an electric system including a power source is indispensable, and there is a disadvantage that the versatility is poor.

However, it is known that a single compound reversibly generates two isomers (A, B) having different colors without changing the molecular weight when irradiated with light. Photochromic materials that generate photochromic properties are compounds that reversibly change color when irradiated with light of a particular wavelength. Among them, the "solid pleochroic property" to which the silver compound is applied is a reversible phenomenon in which, when a solid is irradiated with light of a specific wavelength, the solid changes its color to a color corresponding to the wavelength of the irradiated light, and returns to the original color when irradiated with light other than ultraviolet light.

Incidentally, when three kinds of compounds having extremely similar chemical structures and different molecular states are irradiated with light of specific wavelengths, there are single-crystal (mixed-crystal) photochromic compounds in which compounds that develop color from colorless to blue (1a), red (2a) and yellow (3a) are mixed. When light of a specific wavelength was irradiated to the photochromic compound, the compound developed blue, red and yellow colors, and further, it was confirmed by polarized light absorption spectrum analysis that the three-component photochromic reaction (photochromic property) proceeded while the crystalline state was maintained. The photochromic compound is a single-crystalline diarylethene, and can exhibit pleochroic properties reversibly changing to various colors even in a single crystal. The photochromic reaction of diarylethene is affected by the wavelength of a narrow wavelength band of an ultraviolet region to change color, and the color after the color change has a characteristic of easily returning to the original color by the color of a wavelength of a visible region.

On the other hand, in the field of photosensitive materials for photography such as silver salt color photographs (silver salt photograph photosensitive materials and the like), since improvement of light fastness of the materials is an issue, a phenomenon in which a decrease in density (photochromic property, photochromic reaction) due to light irradiation with natural light or the like is suppressed is considered as a negative phenomenon, and various studies and developments are being made to suppress the phenomenon. For example, a wavelength cut-off agent capable of cutting off a specific wavelength produced from a fuji film is sold under the trade name "COMFOGUARD" as a wavelength cut-off agent capable of selectively cutting off a specific wavelength which is a specific unnecessary wavelength for the purpose of preventing fading of a silver salt photograph and color reproducibility. The wavelength cut agent can adjust the wavelength of light to be cut in units of 20nm, and the region of the cut wavelength can be freely selected from the ultraviolet region to the infrared region as needed.

The inventors of the present invention paid attention to the characteristics of a photochromic material in which a photochromic compound containing a diarylethene is reversibly discolored by receiving light of a specific frequency band and the function of a wavelength cut-off agent capable of cutting off an arbitrary wavelength from an ultraviolet region to an infrared region, and found that the color of the photochromic material discolored to a target color can be maintained under natural light for a required time when a wavelength cut-off agent cutting off a wavelength of a desired frequency band is used.

For example, when light of an ultraviolet region having a specific wavelength that generates photochromism is irradiated on an object whose surface is covered with a specific photochromic compound, the color of the surface of the object can be changed to a target color. When the surface of the object is covered with a wavelength cut agent that cuts off a wavelength of an ultraviolet region included in natural light in order to maintain the color after the color change, the color after the color change can be maintained for a desired time and the color after the color change can be prevented from fading.

The present inventors have further paid attention to the property that diarylethene is easily affected by the wavelength of the ultraviolet region, but is hardly affected by the wavelength of the visible region, and have obtained an finding that the surface of an object (planar portion of a product) is covered with diarylethene, the surface of the diarylethene is irradiated with light of the ultraviolet region to change the color of the diarylethene to a target color, and then the planar portion is coated with a wavelength cut agent which cuts the wavelength of the ultraviolet region included in natural light to cut the wavelength of the ultraviolet region included in the natural light, and the color after the color change is maintained for a certain period of time.

Prior art documents

Patent document

Patent document 1: japanese patent laid-open publication No. 2017-153784

Patent document 2: japanese patent laid-open publication No. 2018-187106

Disclosure of Invention

(problems to be solved by the invention)

A first object of the present invention is to provide a color changing method for covering all or a part (hereinafter, referred to as a planar portion) of a surface of an object with a photochromic substance (hereinafter, also referred to as a photochromic compound or a photochromic material), irradiating the planar portion with light of a specific wavelength to change the color of the planar portion, and irradiating the planar portion after color change with light (wavelength) other than the specific wavelength to restore the original color.

A second object of the present invention is to provide a method for maintaining a color after discoloration for a certain period of time after the planar portion is discolored to a desired color (target color) by utilizing the photochromic property of diarylethene.

(means for solving the problems)

A first invention made to solve the first problem is configured such that a photochromic substance is laminated on a planar portion of an object by coating or the like, and then the surface of the laminated photochromic substance is irradiated with light in an ultraviolet region to change the color of the photochromic substance in photochromic properties. When the light in the ultraviolet region is irradiated, the light is covered with a wavelength cut agent for cutting off the wavelength of natural light or illumination light including ultraviolet rays.

A second aspect of the present invention for solving the second problem is characterized in that a diarylethene is laminated as a photochromic substance on a planar portion of an object by coating or the like, a surface of the laminated diarylethene is irradiated with light of a specific wavelength to change the color of the diarylethene to a target color, and then the surface after the color change is covered with a wavelength cut-off agent for cutting off a wavelength of an ultraviolet region included in natural light or illumination light, thereby maintaining the color change state for a certain period of time.

Hereinafter, "the present invention" in the present specification is used as a concept including the first invention and the second invention.

The photochromic substance laminated on the planar portion includes an organic photochromic compound which changes color to a color in a visible region corresponding to a specific wavelength when light of the specific wavelength is irradiated. The organic photochromic compound includes, for example, a single-crystal diarylethene containing organic molecules having 3 structures. The diarylethene is represented as red by 370nm light of ultraviolet region, as yellow by 380nm light irradiation, as blue by 405nm light, and as color is restored by light change of wavelength of 450nm or more visible region. The light of 370nm, 380nm, and 380nm has a wavelength in the ultraviolet region, but the frequency band is near the visible region.

In the present invention, an inorganic photochromic compound can be used as the photochromic substance, and Ag nanoparticle-supported titanium oxide can be used as an example.

The inorganic photochromic compound can be laminated on a planar portion of an object, and then the surface of the laminated photochromic material is irradiated with light of a wavelength of an arbitrary color (target color) in a visible region to change the color (target color) of the light irradiated with the color of the surface of the planar portion, and the inorganic photochromic compound is used when the color of the planar portion of the object is changed so that the surface of the object after the color change is covered with a wavelength cut-off agent which cuts off the wavelength of natural light including ultraviolet rays.

The inorganic photochromic compound changes to the color when a light of a specific wavelength in the visible region is irradiated. Therefore, the wavelength cut agent used when the surface of the inorganic photochromic compound is coated with the wavelength cut agent in advance is a wavelength cut agent for cutting the wavelength of natural light including ultraviolet rays other than light of a specific wavelength in a visible region irradiated for color change.

The planar portion to which the present invention can be applied is all or a part of any planar portion including nails having a colored surface, artificial nails, lips, hair including hair, glasses, clocks, jewelry items including rings, bracelets, necklaces, and the like (hereinafter referred to as jewelry items), bags, shoes, fiber products including ties, scarves, handkerchiefs, natural fibers or chemical fibers, bodies of vehicles including motorcycles and automobiles, materials for wall surfaces, indoor devices including furniture, outdoor devices including signboards, ceilings, floors of buildings, wall surfaces including side walls, and the like.

In the first aspect of the present invention, a planar portion is prepared by laminating a photochromic substance on a planar portion of an object, and the planar portion is irradiated with light having a wavelength in a region that can be arbitrarily determined. Then, the light irradiation means irradiates the planar portion with light of a specific wavelength, for example, in an ultraviolet region, thereby causing the photochromic substance to generate photochromic properties and changing the color of the planar portion to a target color.

In the practice of the second invention, a diarylethene is prepared as a photochromic substance, and is laminated on a planar portion of an object by painting or the like, and the surface of the laminated diarylethene is irradiated with light of a specific wavelength in an ultraviolet region to change the diarylethene to a target color. When the surface discolored to a target color is covered with a wavelength cut-off agent for cutting off a specific wavelength in an ultraviolet region, the color of the discolored surface can be maintained for a certain period of time.

The photochromic substance is an organic photochromic compound, is diarylethene as an example, and has the following properties: when light of a specific wavelength in the ultraviolet region is irradiated, the color changes to a color in the visible light region corresponding to the specific wavelength to be irradiated, and when light of a wavelength in the visible light region of 450nm or more is irradiated, the original color is restored.

Here, the diarylethene has the characteristics of photochromism (forward discoloration) caused by light with the wavelength of the ultraviolet region and photochromism (reverse discoloration) of the original color of the discolored surface after receiving light with the wavelength of the visible region, and therefore, by using the wavelength cut agent of the ultraviolet region, the discoloration vector in the direction opposite to the forward discoloration vector is antagonized, and the discoloration of the target color after discoloration can be prevented.

The light irradiation means may have a function of irradiating light having a specific wavelength that can be arbitrarily selected between wavelength regions from the ultraviolet region to the infrared region. In addition, as the wavelength cut-off agent for cutting off a specific wavelength, a wavelength cut-off agent capable of adjusting and cutting off the cut-off wavelength in units of 20nm is used.

The method of changing the color of a planar portion of the present invention can be applied to a three-dimensional object such as an automobile body as a new exterior method of a planar portion in place of a conventional exterior method such as painting or polishing. An example of a specific method is as follows.

That is, according to the first invention, a photochromic compound is applied to the outer surface of a three-dimensional object such as an automobile body, the surface of the coating layer is scanned by a 3D scanner to obtain 3D scan data, and the shape of the object is modeled and analyzed. And mapping the object analyzed by modeling with a preselected graphic pattern. At the same time as or subsequent to the mapping, the object to be mapped is irradiated with light of a specific wavelength in the ultraviolet region, and the color of the photochromic compound applied to the object is changed, whereby a graphic pattern can be added to the three-dimensional object, and the color of the object can be changed to a target color. In order to restore the changed color, the original color is restored by irradiation with light in a visible region of 450nm or more.

In the second invention, a photochromic compound is applied to the outer surface of a three-dimensional object, the three-dimensional object having the surface of the coating layer is scanned by a 3D scanner to obtain 3D scan data, and the shape of the three-dimensional object is modeled and analyzed. And mapping the three-dimensional object analyzed by modeling with a preselected graphic pattern. Simultaneously with or subsequent to the 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 three-dimensional object to a target color, and a wavelength cut agent capable of cutting ultraviolet rays included in natural light is applied thereto. This makes it possible to maintain the photochromic state for a predetermined period of time.

As described above, according to the present invention, a graphic pattern can be added to a three-dimensional object to change the color of the object. In order to restore the changed color, the original color is restored by irradiation with visible light of 450nm or more. When the restoration is not desired, a wavelength cut agent in a visible region of 450nm or more is applied to the discolored object. Examples of the three-dimensional object include, in addition to the automobile body, nails, artificial nails, lips, hair, eyebrows, whiskers, glasses, clocks, jewelry items including rings, bracelets, necklaces, and the like (hereinafter referred to as "jewelry items"), bags, shoes, fiber products including ties, scarves, handkerchiefs, natural fibers or chemical fibers, bodies of motorcycles, wall surface materials, indoor devices including furniture and objects to be placed, outdoor devices including signboards, ceilings, floors of buildings, and wall surfaces including side walls.

The light in the ultraviolet region used in the present invention is classified into near ultraviolet (near UV) having a wavelength of 380-200nm, far ultraviolet or vacuum ultraviolet (far UV (FUV) or vacuum UV (vuv)) having a wavelength of 200-10nm, extreme ultraviolet or extreme ultraviolet (extreme UV) having a wavelength of 121-10nm, as classified based on wavelength. From the viewpoint of the influence on human health and the environment, near ultraviolet rays are further classified into UVA (400- & ltSUB & gt 315nm), UVB (315-280 nm), and UVC (less than 280 nm). In the lithography and laser techniques, Deep UV (DUV) is different from FUV and represents ultraviolet rays having a wavelength of 300nm or less. The sunlight contains ultraviolet rays with the wavelength of UVA, UVB and UVC, wherein the UVA and the UVB reach the ground surface through an ozone layer. However, UVC is significantly absorbed by the substance and generally cannot pass through the atmosphere. 99% of the ultraviolet rays reaching the ground surface are UVA (note that UVC is also generated by the reaction of the ozone layer in some cases).

In the present invention, even in the wavelength of the ultraviolet region in which diarylethene develops color, by applying a wavelength cut-off material for selectively cutting off a specific wavelength of UVA which is contained in a large amount of natural light such as sunlight to the surface to be discolored, only the wavelength band of the ultraviolet region in which the concentration of color after discoloration changes with time is selectively cut off from the natural light, irregular discoloration reaction is suppressed, and the fastness of discoloration is improved. That is, in the present invention, it is preferable that the wavelength of the ultraviolet region irradiated by the light irradiation apparatus is a specific wavelength at which UVB, UVC, or the like is hardly included in natural light, and the color rendering property of the maximum density is exhibited by increasing the irradiation output. The color fading caused by receiving light in a visible region including natural light is controlled by irradiating the light in a wavelength band having a minimum width as much as possible in the wavelength of an ultraviolet region to be irradiated, thereby producing a dense selected color (target color) and minimizing the influence of external light, and the fastness of the selected target color can be improved and color fixing can be performed for a certain period of time or longer.

Drawings

Fig. 1 is an explanatory view schematically showing a state where the color changing method of the present invention is applied to nail art (nail, artificial nail).

Fig. 2 is an explanatory view schematically showing a state where the color changing method of the present invention is applied to an automobile.

Fig. 3 is a schematic process diagram for explaining a process of combining the color changing method of the present invention with a mapping of a graphic pattern to an automobile body.

Detailed Description

Next, an embodiment for carrying out the method of the present invention will be described with reference to the drawings.

Fig. 1 is a diagram illustrating an example of applying the present invention to a nail color changing device, where 1 is a human finger, and 2 is a nail of a nail worn on the finger. The nail 2 may be one obtained by coating an organic photochromic compound as a photochromic material on a nail made of plastic or the like, or one obtained by forming an organic photochromic compound into a nail shape.

The nail 2 in the step (a) of fig. 1 is formed by coating a photochromic material 3 with a wavelength cut agent 4 for cutting a specific wavelength in an ultraviolet region. The nail 2 put on the nail of the finger 1 is irradiated with light 5a of an ultraviolet region having a wavelength different from the specific wavelength from the light irradiation means 5 in the next step (b). In fig. 1, reference numeral 6 denotes a light source control unit which selects specific wavelengths of a plurality of ultraviolet regions irradiated from the light irradiation unit 5 in accordance with a color to be changed, and wirelessly supplies a control signal for instructing irradiation of the selected specific wavelengths to the light irradiation unit. For example, the color of nail 2 can be developed (changed) to the respective target colors by irradiating light of 370nm in the case where the target color is red, light of 380nm in the case where the target color is yellow, and light of 405nm in the case where the target color is blue.

The wavelength cut agent 4 for cutting a wavelength of an ultraviolet region other than the irradiated wavelength may be applied by irradiating the photochromic material 3 with light having a wavelength which is changed to a target color from the light irradiation means 5, and applying the wavelength cut agent 4 after changing the color of the photochromic material 3 to the target color. The timing of the application of the wavelength cut agent 4 can be performed after the discoloration of the photochromic material 3 in the following examples, and is the same as in the above examples. The wavelength cut-off agent 4 cuts off a wavelength included in natural light, that is, a wavelength of 400nm to 280nm, preferably at least 400nm to 315 nm. In the present specification, the term of ultraviolet light or ultraviolet wavelength is used as a term having the same meaning as the wavelength of the ultraviolet region.

The light irradiation unit 5 in fig. 1 incorporates a battery as a power source, a lamp as a light source, and a control board. In addition, in the case where the photochromic material 4 is an inorganic type that changes to the color of the irradiated light, a color filter is disposed in front of the light source. In the case of drawing a pattern or the like on the nail 2, a pattern plate formed of liquid crystal or the like is placed in front of the light source.

The photochromic material 3 of the nail art 2 irradiated with the light 5a of the specific wavelength is changed into a color of the wavelength of the visible region corresponding to the irradiated specific wavelength. Since the surface of the photochromic material 3 is coated with the wavelength cut agent 4 capable of cutting ultraviolet rays included in natural light, the color of the photochromic material that is cut by the ultraviolet rays does not fade for a certain period of time (see step (c)).

Next, an example in which the color changing method of the present invention is applied in combination to a map of a graphic pattern on an automobile body will be described with reference to fig. 2 and 3.

Fig. 2 is a conceptual view of the case where the color changing method of the present invention is applied to an automobile body. In fig. 2, a photochromic material 11 is coated on a body 10 of an automobile. Therefore, a handheld dedicated device (hereinafter, referred to as a rewritable booster 13) having a 3D scanning function and a projection mapping function and irradiating light of a specific wavelength that changes the color and pattern of the object (vehicle body 10) is used. This allows the color and graphic design of the body 10 of the automobile to be changed instantaneously according to the scene, the season, the mood of the day, or the like, and thus, it is possible to reduce the overwhelming time and cost compared to conventional painting, polishing, or the like, and it is possible to obtain a great advantage for the user. The above example will be described in order of steps with reference to fig. 3. The application of the ultraviolet wavelength cut-off agent 12 is performed after the photochromic material 11 is discolored by the light irradiation of the rewritable booster 13.

In step 1, the automobile body 10 is 3D scanned. That is, the entire automobile body 10 is scanned around the periphery of the automobile while the scanning laser beam 13a is irradiated to the automobile body 10 by the rewritable booster 13.

In step 2, the body shape of the automobile body 10 is instantaneously modeled and analyzed 10a by a dedicated application software based on the scan data obtained in step 1, and mapping data 13b of a preselected graphic pattern 14 is generated.

In step 3, while the vehicle body 10 is irradiated with light of a specific wavelength in the ultraviolet region by the rewritable booster 13, the map data 13b created in step 2 is projected onto the vehicle body 10 while circling the periphery of the vehicle. Thereby, the photochromic material 11 on the surface of the automobile body 10 changes 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, since the desired graphic pattern can be mapped while changing the color of the automobile body 10 to the target color, the time and labor required for the conventional method of coating the body and mapping the graphic can be significantly reduced.

The advantages are that not only can the user of the automobile enjoy, but also the automobile dealer can enjoy. That is, by applying the method of the present invention to a shop-displayed automobile, one automobile can be displayed with a plurality of colors or graphics.

The present invention described above can be applied to objects such as nails, artificial nails, lips, hair including hair, glasses, clocks, jewelry products including rings, bracelets, necklaces, and the like, bags, shoes, fiber products including ties, scarves, and handkerchiefs, natural fibers, chemical fibers, bodies of vehicles including motorcycles and automobiles, wall materials, indoor devices including furniture and articles to be placed, outdoor devices including signboards, ceilings, floors, and walls including side walls of buildings.

(description of reference numerals)

1 finger

2 nail beauty (Artificial nail)

3 photochromic materials

4 wavelength intercepting agent

5 light irradiation unit

6 light source control part.