Color conversion system and color conversion method

Abstract

The present invention displays a discretionary color on a prescribed medium such as a watch, jewelry, or nails, for example.　This color conversion system converts the color of a crystal 42 of a timepiece 4, for example, the color conversion system comprising an illumination device 2 for emitting visible light and ultraviolet light, and a portable terminal 1 for controlling the emission of visible light and ultraviolet light by the illumination device 2. The illumination device 2 irradiates the crystal 42, which has a photochromic layer 61, with ultraviolet rays from a UV light source 55 and with visible light of red, green, and blue from respective LED light sources 56a, 56b, 56c of three colors. The portable terminal 1 controls the illumination device 2 so as to irradiate the crystal 42 with the ultraviolet rays from the UV light source 55 to cause the crystal 42 to become colored, and so as to irradiate the crystal 42 with the red, green, and blue visible light from the respective LED light sources 56a, 56b, 56c to cause the crystal 42 to become decolored.

Description

Color conversion system and color conversion method

[0001] The present invention relates to a color conversion system and a color conversion method.

[0002] Photochromic materials are known that change color when irradiated with light, resulting in a structural change. For example, a photochromic material develops color when irradiated with ultraviolet light in a transparent state. When irradiated with visible light in a colored state, the photochromic material returns to its transparent state. Techniques for writing and erasing markings using photochromic compounds have been proposed. Specifically, a writing instrument using a photochromic material and a color conversion system that applies color and fading to a coating film applied by the writing instrument have been proposed (see, for example, Patent Document 1).

[0003] Patent No. 4294349

[0004] However, conventional color conversion systems alone cannot display any color.

[0005] The present invention has been made in view of the above circumstances, and has as its object to make it possible to display any color on a predetermined medium.

[0006] In order to achieve the above object, one embodiment of the color conversion system of the present invention is a color conversion system for converting the color of a predetermined medium, comprising: the predetermined medium having a photochromic layer; an illumination device that irradiates the predetermined medium with ultraviolet light from an ultraviolet light source and red, green, and blue visible light from red, green, and blue visible light source sources, respectively; and an information processing device that controls the irradiation by the illumination device, wherein the photochromic layer has three types of photochromic materials that develop colors of cyan, magenta, and yellow when irradiated with ultraviolet light from the illumination device, and the information processing device has color conversion control means that irradiates the predetermined medium with ultraviolet light from the ultraviolet light source of the illumination device to develop a color, and irradiates the predetermined medium with red, green, and blue visible light from the red, green, and blue visible light source sources of the illumination device, respectively, under conditions necessary for conversion to a predetermined color, thereby fading the predetermined medium, thereby performing control to convert the predetermined medium to the predetermined color. A color conversion method corresponding to the color conversion system according to one aspect of the present invention is also provided as a color conversion method according to one aspect of the present invention.

[0007] According to the present invention, any color can be displayed on a predetermined medium.

[0008] 1 is a diagram showing a schematic configuration of a color conversion system according to a first embodiment of the present invention. FIG. 1 is a block diagram showing the hardware configuration of a mobile terminal in the color conversion system of FIG. 1. FIG. 2 is a block diagram showing the functional configuration of a mobile terminal having the hardware configuration of FIG. 2, the configuration of an illumination device 2, and the structure of a predetermined medium in the color conversion system of FIG. 1. FIG. 3 is a diagram showing the light source and light characteristics (wavelength) of the illumination device of FIG. 3. FIG. 4 is a diagram showing an outline (5) of a color conversion system according to an embodiment of the present invention. FIG. 5 is a diagram showing the absorption spectrum of a photochromic material after UV light irradiation. FIG. 6 is a diagram showing how the irradiation intensities of blue, green, and red light sources are adjusted for each color. FIG. 7 is a diagram showing the absorption spectrum absorbed by a coating layer after irradiating a color conversion layer with visible light with the irradiation intensity adjusted as in FIG. 7. FIG. 8 is a diagram showing the absorption spectrum of a cyan-exhibiting photochromic material after color development and fading, the absorption spectrum of the coating layer, and the terrestrial spectrum of sunlight. FIG. 9 is a diagram showing an example in which diarylethene is used as a photochromic material in a photochromic layer that achieves cyan, magenta, and yellow. FIG. 10 is a diagram showing a yellow-exhibiting photochromic material. FIG. 11 is a diagram showing a magenta-exhibiting photochromic material. FIG. 12 is a diagram showing a cyan-exhibiting photochromic material. 17 is a flowchart showing the operation of a color conversion system having the functional configuration of FIG. 3. FIG. 18 is a diagram showing an example of a color specification screen (UI) of the mobile device of FIG. 3. FIG. 19 is a diagram showing an example of a color setting screen (UI) of the mobile device of FIG. 3. FIG. 20 is a diagram showing a second embodiment of a color conversion system including the lighting device shown in FIG. 3. FIG. 21 is a diagram showing a schematic view of a layered structure of nails to be applied to a fingernail that is a target (predetermined medium) for color conversion by the lighting device of FIG. 17. FIG. 22 is a diagram showing the absorption spectrum of a UV absorber, the spectrum of illumination for coloring a photochromic layer, and the absorption spectrum of a polymerization initiator for a visible light curable resin. FIG. 23 is a flowchart showing the process of nail formation and color conversion in the color conversion system of the second embodiment. FIG. 24 is a diagram showing a third embodiment of a color conversion system including the lighting device shown in FIG. 3. FIG. 25 is a diagram showing a fourth embodiment of a color conversion system including the lighting device shown in FIG. 1. FIG. 26 is a diagram showing a fifth embodiment of a color conversion system including the lighting device shown in FIG. 1. FIG. 27 is a diagram showing a sixth embodiment of a color conversion system including the lighting device shown in FIG. 1.Fig. 10 is a diagram showing a seventh embodiment of a color conversion system including the lighting device shown in Fig. 1. Fig. 11 is a diagram showing an eighth embodiment of a color conversion system including the lighting device shown in Fig. 1. Fig. 12 is a diagram showing a ninth embodiment of a color conversion system including the lighting device shown in Fig. 1.

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, an outline of a color conversion system according to a first embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a diagram showing the general configuration of the color conversion system according to the first embodiment of the present invention.

[0010] As shown in FIG. 1, the color conversion system according to the first embodiment of the present invention is a color conversion system that converts the color of an ornament (predetermined medium) such as a crystal 42 of a watch 4, for example.

[0011] The color conversion system is configured by connecting an illumination device 2 that illuminates the crystal 42 of the watch 4 and a mobile terminal 1 that controls the illumination device 2 via a wireless communication network such as Bluetooth. Bluetooth is a registered trademark.

[0012] The lighting device 2 is operated by, for example, a store operator, etc., to turn the power on and off, etc. The lighting device 2, which is activated by the power-on operation, is controlled by the mobile terminal 1 and irradiates ultraviolet light (UV light) or visible light onto a predetermined medium placed at a predetermined position within the device.

[0013] Generally, ultraviolet rays have shorter wavelengths than visible light and refer to electromagnetic waves in the range of 10 to 380 nm. Wavelengths longer than 380 nm are called visible light. The region (range) of 300 nm to 380 nm can be said to be the boundary area between ultraviolet rays and visible light.

[0014] The predetermined medium may be, for example, a watch, nails, glasses, jewelry, contact lenses, shoes, bags, vehicles, and various other decorative items. The configuration of the lighting device 2 corresponding to each decorative item will be described later.

[0015] The mobile terminal 1 is managed by a store operator or the like. The mobile terminal 1 controls the light emission operation of the lighting device 2 and executes various processes.

[0016] FIG. 2 is a block diagram showing the hardware configuration of the mobile terminal in the color conversion system of FIG.

[0017] The mobile terminal 1 includes a CPU (Central Processing Unit) 11, a ROM (Read Only Memory) 12, a RAM (Random Access Memory) 13, a bus 14, an input / output interface 15, an output unit 16, an input unit 17, a memory unit 18, a communication unit 19, and a drive 20.

[0018] The CPU 11 executes various processes according to programs recorded in the ROM 12 or programs loaded from the storage unit 18 into the RAM 13. The RAM 13 also stores data and the like necessary for the CPU 11 to execute various processes.

[0019] The CPU 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output interface 15 is also connected to this bus 14. An output unit 16, an input unit 17, a storage unit 18, a communication unit 19, and a drive 20 are connected to the input / output interface 15.

[0020] The output unit 16 is made up of a display, a speaker, etc., and outputs various information as images and sounds. The input unit 17 is made up of a keyboard, a mouse, etc., and inputs various information.

[0021] The storage unit 18 is configured with a hard disk, a dynamic random access memory (DRAM), etc., and stores various data. The communication unit 19 communicates with other devices (the lighting device 2 in the example of FIG. 1 ) via a wireless communication network.

[0022] Removable media 21, such as a magnetic disk, optical disk, magneto-optical disk, or semiconductor memory, is appropriately attached to the drive 20. Programs read from the removable media 21 by the drive 20 are installed in the storage unit 18 as needed. The removable media 21 can also store various data stored in the storage unit 18 in the same way as the storage unit 18.

[0023] Figure 3 is a block diagram showing the functional configuration of a mobile terminal having the hardware configuration of Figure 2, the configuration of an illumination device 2, and the structure of a predetermined medium, all of which are part of the color conversion system of Figure 1. As shown in Figure 3, this color conversion system includes an illumination device 2, a color conversion layer 60 disposed on the surface of or within the crystal 42 of a watch 4 as the predetermined medium, and a mobile terminal 1. In this color conversion system, the mobile terminal 1 controls the irradiation of visible light and UV light by the illumination device 2, and the illumination device 2 irradiates the crystal 42 of the watch 4 with visible light and UV light based on control from the mobile terminal 1. The color conversion layer 60 is disposed on the surface of the crystal 42, and by sequentially irradiating it with UV light and visible light, the color of the color conversion layer 60 changes (coloring and then fading), causing the colorless, transparent crystal 42 below the color conversion layer 60 to also change to a colored, transparent state.

[0024] First, we will explain the functional configuration of the mobile terminal 1. As shown in Fig. 3, color information, light source control information, etc. are stored in one area of ​​the storage unit 18 (see also Fig. 2) of the mobile terminal 1. The color information is information that links the light source control information with a color displayed in a UI (User Interface: for example, the screen of the mobile terminal 1 on which the color selection button area 151 in Fig. 15 is arranged) where the user specifies a color.

[0025] The light source control information includes parameterized information (parameter values ​​in FIG. 16 ) of applied voltages for individually driving the UV light source 55 and LED light sources 56 a, 56 b, and 56 c of the lighting device 2 according to the color specified by the user on the UI, and information including the light irradiation time (number of seconds) of each light source. In FIG. 16 , the preset parameter values ​​are, for example, 255 for UV, 255 for R (red), 0 for G (green), and 0 for B (blue).

[0026] In the CPU 11 of the mobile terminal 1, when controlling the color conversion operation of the lighting device 2, a UI providing unit 31 and a color conversion control unit 32 function.

[0027] The UI providing unit 31 provides the user with a UI (User Interface: for example, the screen of the mobile terminal 1 in FIG. 15 or 16) through which the user can perform a designation operation to designate a predetermined color from among a plurality of colors.

[0028] The screen of the mobile terminal 1 provided by the UI providing unit 31 (see FIGS. 15 and 16 ) includes a specified color specification area (color selection button area 151 in FIG. 15 ) that accepts a specification operation to specify a predetermined color (e.g., red) from among N predefined colors (e.g., eight colors), a customization specification area (customization area 161 in FIG. 16 ) that accepts a specification operation to specify an arbitrary color created by a user as a predetermined color, etc. In addition, the UI providing unit 31 also provides a page for the user to create a color and a screen of a sales site for selling the color created by the user to others.

[0029] The color conversion control unit 32 receives a predetermined color designated by a designation operation performed on the UI (see FIG. 15 ), and notifies the lighting device 2 of control information (light source control information) for converting a predetermined medium into the predetermined color. Specifically, when, for example, the "red" button is designated in the color selection button area 151 on the screen of FIG. 15 , the color conversion control unit 32 expresses a color by transmitting light source control information for controlling the LED light source of each color corresponding to the "red" button to the lighting device 2.

[0030] The color conversion control unit 32 performs control to convert the windshield glass 42 into a predetermined color (predetermined color) by irradiating the windshield glass 42 (more precisely, the color conversion layer 60) (predetermined medium) with ultraviolet light (UV light) from the UV light source 55 of the lighting device 2 to cause the windshield glass 42 to develop a color, and then irradiating the windshield glass 42 with light source control information (conditions such as light irradiation intensity and irradiation time) required to convert the red, green, and blue visible light from each of the red, green, and blue LED light sources 56a, 56b, and 56c of the lighting device 2 into a predetermined color, thereby fading the windshield glass 42.

[0031] Specifically, the color conversion control unit 32 transmits light source control information to the lighting device 2, and in the lighting device 2, the communication unit 51 receives the light source control information transmitted from the mobile terminal 1 and passes it to the light source driving unit 52. Based on the light source control information, the light source driving unit 52 drives the UV light source 55 and the LED light sources 56a, 56b, and 56c to irradiate light from each of them.

[0032] The light source control information includes a parameter value for the applied voltage and irradiation time for each color. The parameter value for the applied voltage is divided into values ​​from 0 (minimum) to 255 (maximum) up to the maximum voltage at which the light source can be driven, and one of these values ​​is sent. The light source driving unit 52 applies a voltage corresponding to the parameter value to the light source to drive the light source and cause it to emit light. The irradiation time is the time for which the light source of each color irradiates light onto the medium, and is, for example, the number of seconds.

[0033] Next, the configuration of the lighting device 2 will be described. The lighting device 2 has a communication unit 51, a light source drive unit 52, a power supply unit 53, a housing for housing the clock 4, an ultraviolet light source (hereinafter referred to as "UV light source 55"), and LED light sources 56a, 56b, and 56c as visible light sources. Note that, hereinafter, when it is not necessary to distinguish between the LED light sources 56a, 56b, and 56c, they will be referred to as LED light source 56. The lighting device 2 has an openable and closable lid and case. The UV light source 55 and the LED light sources 56a, 56b, and 56c are arranged on the back of the lid. The case houses, for example, the clock 4 as a predetermined medium. The lighting device 2 irradiates the windshield 42 inside the case, with UV light from the UV light source 55 and red, green, and blue visible light from the LED light sources 56a, 56b, and 56c, respectively, onto the windshield 42 inside the case, with the lid closed to block external light.

[0034] The communication unit 51 receives light source control information by communicating with the portable terminal 1. The light source driving unit 52 controls the UV light source 55 and the LED light source 56 based on the light source control information received from the portable terminal 1. Specifically, the light source driving unit 52 drives each of the LED light sources 56 a, 56 b, and 56 c individually (by individually changing the applied voltage, irradiation time, etc.) based on the light source control information. The power supply unit 53 supplies power to each unit of the lighting device 2.

[0035] Although not shown in FIG. 3 , the illumination device 2 may have an optical system including, for example, lenses, mirrors, and a mask. In this case, the mask is, for example, an optical mask for forming an image on the photochromic layer 61, and is disposed between the opening of the housing and the UV light source and the LED light source. The optical mask is, for example, an optical glass on which a chrome layer is patterned. Furthermore, in addition to the LED light source, a laser light source may be used as the visible light source. When a laser light source is used, the illumination device 2 may be configured to scan the laser light at high speed without using a mask.

[0036] The crystal 42 is provided on the top surface of the watch body 4. The crystal 42 has a color conversion layer 60 on its surface (top surface). Before processing, the color conversion layer 60 is colorless and transparent, allowing the dial of the watch 4 to be seen through. The color conversion layer 60 comprises a photochromic layer 61 disposed on the crystal 42 and a coating layer 62 disposed on the photochromic layer 61. The coating layer 62 is the top surface exposed to the outside and is therefore exposed to all types of everyday light, including sunlight. The color conversion layer 60 develops and fades (decolorizes) when exposed to the above-mentioned UV and visible light, contributing to color conversion. After achieving a desired color, the color conversion layer 60 can be exposed to natural light, particularly sunlight containing visible and UV light. Fading caused by visible light of a similar intensity to sunlight is suppressed for a predetermined period of time for all photochromic materials. This predetermined period is, for example, one to two days (or approximately one week depending on the medium and the environment in which the medium is used).

[0037] The coating layer 62 has a UV light absorption wavelength range (e.g., 325 nm to 430 nm) and transmits UV light for color development (e.g., wavelength 325 nm). The edge of the absorption band of the coating layer 62 and the wavelength of the UV light for color development coincide with 325 nm. Specifically, the coating layer 62 absorbs UV light in a predetermined ultraviolet wavelength range. For example, it absorbs UV light in a wavelength range from an ultraviolet wavelength range of A nm to an ultraviolet wavelength range of B nm. For example, A nm is 325 nm and B nm is 430 nm. Because the absorption at the absorption edge of the coating layer 62 is not 100%, at least a portion of the UV light for color development passes through the coating layer 62.

[0038] On the other hand, the coating layer 62 absorbs UV light contained in sunlight (wavelengths of 325 nm or longer at the Earth's surface).The display area that has undergone color development and fading is not irradiated with at least most of the UV light (e.g., 325 nm to 430 nm) that promotes color development due to sunlight, and the display color of the color conversion layer 60 is maintained.

[0039] This coating layer 62 absorbs UV light in that wavelength range, preventing the UV light in that wavelength range from reaching the photochromic layer 61 and suppressing color development. As described above, even when the color conversion layer 60 is exposed to sunlight, color development and fading are suppressed, and the color achieved in the color conversion layer 60 is maintained.

[0040] The photochromic layer 61 is transparent before being irradiated with UV light, and contains three types of photochromic materials that, when irradiated with UV light, develop a cyan color by absorbing red light, a magenta color by absorbing green light, and a yellow color by absorbing blue light.

[0041] The photochromic material fades to transparency when irradiated with visible light. A cyan photochromic material fades to transparency when irradiated with red light. A magenta photochromic material fades to transparency when irradiated with green light. A yellow photochromic material fades to transparency when irradiated with blue light. However, for all photochromic materials, fading due to visible light of an intensity similar to that of sunlight is suppressed for a predetermined period of time. The photochromic material can absorb light with a wavelength shorter than the ultraviolet wavelength A nm, and develops color when irradiated with light with a wavelength shorter than the ultraviolet wavelength A nm.

[0042] The photochromic layer 61 contains three types of photochromic materials that develop yellow, magenta, and cyan colors, respectively, when irradiated with UV light and visible light from the lighting device 2. The photochromic layer 61 is transparent before being irradiated with UV light. The photochromic layer 61 contains three types of photochromic materials that develop cyan, which absorbs red light, magenta, which absorbs green light, and yellow, which absorbs blue light, respectively, when irradiated with UV light.

[0043] The photochromic material fades to a transparent state when irradiated with visible light. A cyan photochromic material fades to a transparent state when irradiated with red light. A magenta photochromic material fades to a transparent state when irradiated with green light. A yellow photochromic material fades to a transparent state when irradiated with blue light. However, for all photochromic materials, fading due to visible light of an intensity similar to that of sunlight is suppressed for a certain period of time.

[0044] When UV light containing light with a wavelength shorter than the ultraviolet wavelength A nm is irradiated, the UV light is not absorbed by the coating layer 62. As a result, the UV light reaches the photochromic layer 61. The photochromic layer 61 reacts to the UV light and changes to cyan, magenta, and yellow. The cyan, magenta, and yellow colors are mixed to achieve black or an achromatic color. Although black or an achromatic color is used, it is not necessarily required to be completely black or completely achromatic.

[0045] The red, green, and blue visible light emitted from the lighting device 2 is irradiated onto the color conversion layer 60 that has developed a black color based on a predetermined irradiation intensity, an irradiation intensity ratio for each color, and an irradiation time. Specifically, the cyan, magenta, and yellow colors can be faded by adjusting the irradiation intensity of the red, green, and blue visible light, the irradiation intensity ratio for each color, and the irradiation time. Any color can be realized by varying the degree of fading of each color of cyan, magenta, and yellow.

[0046] The coating layer 62 transmits visible light, so that red, green, and blue light reach the photochromic layer 61. To output visible light in a narrow band for each color, an LED with a narrow half-width of, for example, 5 to 10 nm is used as the visible light source.

[0047] For example, red light selectively bleaches cyan-colored photochromic materials but to a lesser extent magenta and yellow, green light selectively bleaches magenta-colored photochromic materials but to a lesser extent cyan and yellow, and blue light selectively bleaches yellow-colored photochromic materials but to a lesser extent cyan and magenta, compared to yellow.

[0048] In the example of the timepiece 4 shown here, the photochromic layer 61 is disposed on the crystal 42 , but the photochromic layer 61 may also be included inside the crystal 42 .

[0049] The operating principle of this color conversion system will be described below with reference to FIGS. 4 to 13. First, the light source and light characteristics (wavelength) will be described with reference to FIG. 4. FIG. 4 is a diagram showing the light source and light characteristics (wavelength) of the lighting device of FIG. 3. The UV light source 55 shown in FIG. 3 is a light source that irradiates ultraviolet light, and may be, for example, a high-pressure mercury lamp, a low-pressure mercury lamp, an ultraviolet LED, or an ultraviolet laser. The UV light emitted by the UV light source 55 includes, for example, UV light 71 with a wavelength of 325 nm. When, for example, an ultraviolet LED is used as the UV light source 55, the ultraviolet LED emits UV light 71 (see FIG. 4) having a center wavelength of 325 nm ±5 nm to ±10 nm. This UV light 71 has a half-width of ±5 nm to ±10 nm.

[0050] The visible light source shown in FIG. 3 includes an LED light source 56a that emits green light, an LED light source 56b that emits blue light, and an LED light source 56c that emits red light. The LED light source 56a emits blue visible light 74 (see FIG. 4) with a half-width of 5 to 10 nm and a center wavelength of 430 nm ±5 to ±10 nm, for example. The LED light source 56b emits green visible light 73 (see FIG. 4) with a half-width of 5 to 10 nm and a center wavelength of 525 nm ±5 to ±10 nm, for example. The LED light source 56c that emits red light emits visible light 72 (see FIG. 4) with a half-width of 5 to 10 nm and a center wavelength of 650 nm ±5 to ±10 nm, for example. The wavelengths and half-widths are not limited to those mentioned above and can be appropriately changed in design.

[0051] FIG. 5 shows the absorption spectrum of the photochromic material before UV light irradiation and the spectrum of the irradiated UV light. FIG. 6 shows the absorption spectrum of the photochromic material after UV light irradiation. FIG. 7 shows how the irradiation intensities of the blue, green, and red light sources are adjusted for each color. FIG. 8 shows the absorption spectrum absorbed by the coating layer after irradiating the color conversion layer with visible light with the irradiation intensity adjusted as in FIG. 7. Before UV light irradiation, diarylethene, for example, is used as the photochromic material in the photochromic layer 61. As shown in FIG. 5, the photochromic material has an absorption spectrum 76 only in the UV light region and is transparent. In contrast, the UV light irradiated onto the photochromic layer 61 from the UV light source 55 has spectrum 71 in FIG. 5.

[0052] For example, when three types of photochromic materials that develop yellow, magenta, and cyan colors are used, the photochromic material that develops yellow has an absorption band in the blue wavelength range, the photochromic material that develops magenta has an absorption band in the green wavelength range, and the photochromic material that develops cyan has an absorption band in the red wavelength range.

[0053] Therefore, when three types of photochromic materials that develop colors of yellow, magenta, and cyan are used, the photochromic materials will develop colors of yellow, magenta, and cyan after irradiation with UV light, turning black overall, as shown in Figure 6. Note that the graph in Figure 6 shows a simplified absorption spectrum of the three colors of yellow, magenta, and cyan, but it is also possible to select materials that are more complex and have narrower or wider half-value widths.

[0054] When visible light for fading is emitted from, for example, an LED light source 56 in accordance with the absorption band of each photochromic material, blue light with a center wavelength of 430 nm and a half-width of 10 nm is emitted from the blue LED, as shown in FIG. 7 . The blue light is absorbed by the yellow photochromic material, causing the yellow photochromic material to fade. The green light is absorbed by the magenta photochromic material, causing the magenta photochromic material to fade. The red light is absorbed by the cyan photochromic material, causing the cyan photochromic material to fade. By adjusting the irradiation intensity and irradiation time, the degree of fading of each color changes, as shown in FIG. 7 . In the example of FIG. 7 , the intensity of the blue LED is greater than the intensity of the red LED and greater than the intensity of the green LED. In this case, the order of yellow fading is greater than cyan fading and greater than magenta fading.

[0055] The absorption spectrum of the color conversion layer 60 after being irradiated with visible light at the irradiation intensity shown in Fig. 7 is as shown in Fig. 8. The order of absorption of the green, red, and blue colors by the color conversion layer 60 is green absorption > red absorption > blue absorption. As a result, the displayed color is blue, followed by red, and least green, and as a result of absorbing each of the three colors, a blue-purple display is realized.

[0056] FIG. 9 shows the absorption spectrum of a cyan photochromic material after color development and fading, the absorption spectrum of a coating layer, and the spectrum of sunlight on the ground.

[0057] The absorption spectrum of the cyan photochromic material after color development and fading is absorption spectrum 78 shown in Figure 9. The absorption spectrum of the coating layer 62 is absorption spectrum 75. The spectrum of sunlight at the Earth's surface is spectrum 79.

[0058] The absorption spectrum of the cyan-exhibiting photochromic material after coloring and fading has an absorber in the ultraviolet region because irradiation with visible light (red light) causes a portion of the cyan-exhibiting photochromic material to return to the state it was in before UV light irradiation.

[0059] Sunlight at the earth's surface contains UV light, which overlaps with the absorption band (325 nm to 430 nm) of the cyan photochromic material due to its structure before exposure to UV light. In other words, exposure to the UV rays contained in sunlight can cause the photochromic material to develop color.

[0060] The coating layer 62 eliminates this possibility because it absorbs light in the 325 nm to 430 nm wavelength range, which is ultraviolet light in sunlight and can have adverse effects. Due to absorption by the coating layer 62, the ultraviolet light in sunlight does not reach the photochromic layer 61, and the state of the photochromic layer 61 is maintained. As a result, the photochromic layer 61, which has been colored and faded, maintains its state, and the displayed color achieved by coloring and fading is maintained.

[0061] 4, the color-developing UV light will be further explained. Since the color-developing UV light is irradiated onto the coating film on which the coating layer 62 is formed, it is preferable that the UV light is not absorbed by the coating layer 62.

[0062] However, simply shortening the wavelength of UV light results in a high energy value, which can have adverse effects on, for example, the skin. For this reason, it is preferable that the wavelength of the UV light for color development be as long as possible. Furthermore, it is preferable that the wavelength of the UV light for color development be set close to or partially overlapping the short wavelength side of the absorption band of the coating layer 62.

[0063] 4, the coating layer 62 absorbs UV light in the range of 325 nm to 430 nm, and the UV light for color development has a wavelength of 325 nm, which is the same wavelength as the wavelength at the absorption edge of the coating layer 62. Although a portion of the UV light for color development is absorbed by the coating layer 62, by providing sufficient intensity for color development, the UV light for color development can cause the photochromic layer 61 to develop color without any problems.

[0064] 10 is a diagram showing an example in which diarylethene, for example, is used as the photochromic material for the photochromic layer that realizes cyan, magenta, and yellow. As the photochromic material for the photochromic layer that realizes cyan, magenta, and yellow, for example, diarylethene shown in FIG. 10 may be used.

[0065] 11 is a diagram showing a photochromic material that exhibits yellow. As the photochromic material that exhibits yellow, the material shown in FIG. 11 can be used.

[0066] 12 is a diagram showing a photochromic material that exhibits magenta. As the photochromic material that exhibits magenta, the material shown in FIG. 12 can be used.

[0067] FIG. 13 is a diagram showing a photochromic material that exhibits cyan. As the photochromic material that exhibits cyan, the one shown in FIG. 13 can be used. Note that the example of the photochromic material shown here is just an example, and the photochromic material is not limited to the above, and the color that is exhibited can be appropriately designed by adding various functional groups to diarylethene. Furthermore, the photochromic material is not limited to diarylethene, and any known photochromic material can be used.

[0068] Here, the operation of the color conversion system having the functional configuration of Fig. 3 will be described with reference to Figs. 14 to 16. Fig. 14 is a flowchart showing the operation of the color conversion system having the functional configuration of Fig. 3. Fig. 15 is a diagram showing an example of a color designation screen (UI) of the mobile terminal of Fig. 3. Fig. 16 is a diagram showing an example of a color setting screen (UI) of the mobile terminal of Fig. 3.

[0069] When causing lighting device 2 housing clock 4 to perform a color conversion operation, the user can display the color designation screen shown in Fig. 15 by performing a display operation on the color designation screen on mobile terminal 1. The color designation screen, color setting screen, etc. displayed on mobile terminal 1 are called UI (User Interface).

[0070] As a method for displaying a color specification screen on the mobile terminal 1, there is a first method in which, for example, an application program for color conversion processing (hereinafter referred to as "app") is installed on the mobile terminal 1 in advance, and the app is started by clicking on the icon of the color conversion app displayed on the top screen of the mobile terminal 1, thereby displaying the color specification screen.

[0071] Alternatively, a second method may be used in which the browser of the mobile terminal 1 accesses a website of a color conversion service provided by a service provider and a color specification screen provided by the website is displayed.

[0072] The color specification screen of Fig. 15 has a color selection button area 151. Color selection buttons such as UV, red, yellow, purple, magenta, orange, blue, green, and gray are arranged in the color selection button area 151. The user can specify the color of the crystal 42 (see Fig. 1) of the watch 4 by selecting a desired color from the buttons in the color selection button area 151 and clicking that button.

[0073] If the desired color is not available on the color specification screen of FIG. 15, or if a different color is to be created from the default color, the color specification screen of FIG. 16 is displayed by clicking the "Color Settings" button on the color specification screen of FIG. 15.

[0074] The color setting screen of FIG. 16 includes a customization area 161. The customization area 161 is a customization instruction area in which the user can customize and generate any color and specify the generated color as a predetermined color. Specifically, the customization area 161 includes an input window 162 for changing the parameter values ​​of UV, R (red), G (green), and B (blue), and an input window 163 for specifying the irradiation time. There is also an input field for specifying the ratio of the three colors. The input window 162 allows the user to set a parameter value for irradiation intensity (the voltage value applied to each of the red, green, and blue light sources) between 0 and 255. 0 is the minimum value, and 255 is the maximum value.

[0075] As shown in FIG. 14, in step S101, when an operation is performed on the user's mobile terminal 1 to specify a desired color (e.g., red) from among N predefined colors (e.g., eight colors) on the color specification screen, the color specification is accepted by the UI providing unit 31.

[0076] When a color is specified, the lighting device 2 starts lighting operation under control of the mobile terminal 1. In this case, in step S102, first, UV light is emitted from the UV light source 55, causing the color conversion layer 60 on the surface of the crystal 42 of the watch 4 to develop color.

[0077] Specifically, when a color is specified on the color specification screen of the mobile terminal 1, the UI providing unit 31 accepts the color specification and passes the color information to the color conversion control unit 32. Based on the color information, the color conversion control unit 32 reads corresponding light source control information from the storage unit 18 and transmits the light source control information to the lighting device 2. The light source control information includes parameter values ​​for the irradiation intensity and irradiation time of UV light and visible light of each color. In addition, the light source control information may also include the irradiation ratio of each color, etc., as necessary.

[0078] In the lighting device 2, the communication unit 51 receives the light source control information transmitted from the mobile terminal 1 and passes it to the light source driving unit 52. Based on the light source control information, the light source driving unit 52 drives the UV light source 55 to irradiate UV light onto the clock 4. At this time, the UV light is irradiated for an irradiation intensity and irradiation time corresponding to the parameter values ​​included in the light source control information.

[0079] Next, in step S103, the light source driving unit 52 irradiates the red, green, and blue visible light from each of the red, green, and blue LED light sources 56a, 56b, and 56c of the lighting device 2 under the conditions required to convert the red, green, and blue visible light into a predetermined color (irradiation intensity and irradiation time corresponding to the parameter values ​​of each of the three LED light sources 56 included in the light source control information), thereby fading the color conversion layer 60 of the crystal 42 of the watch 4, thereby performing control to convert the color conversion layer 60 of the crystal 42 of the watch 4 into the color specified by the user.

[0080] Here, we will explain a business model using the color conversion system of the first embodiment. In the above embodiment, we have described an example in which a three-layer color conversion layer 60 is formed on the surface of the crystal 42 of the watch 4, but it is also possible to change the color of the dial of the watch 4 by using a UV-reactive transparent dye. The watch 4 has a three-layer structure, with the top layer being a glass layer with UV-blocking properties, the second layer being a dial layer containing a UV-reactive dye, and the third layer being a substrate layer for the watch 4.

[0081] Specifically, the present invention provides a watch 4 with a three-layer color conversion layer. The top layer is the crystal glass of the watch 4, which has UV protection and is either kneaded into or coated with a liquid that blocks specific UV light. The second layer is the dial, which is coated with a colorless, transparent UV-reactive pigment. The third layer, the bottom layer, is the watch substrate, which supports the dial. The user selects a color via an app on the mobile device 1 and changes the color of the dial and second hand by irradiating them with UV light using the lighting device 2 (a dedicated UV irradiation device).

[0082] The business model involves providing a service that uses a special UV-reactive transparent pigment to change the color of the dial of a watch 4. In this case, the service provider sells colors to users through a mobile application, and the users select and purchase a color through the mobile application. The service provider then temporarily changes the color of the dial and second hand to match the color purchased by the user using a color conversion system including a lighting device 2 (UV irradiation device). The discolored state of the dial and second hand is maintained for 24 hours to one week, after which they return to transparency.

[0083] The service will sell the watch 4 online and / or at retail stores, and will also introduce a subscription model. By providing regular updates with new designs and colors, users can enjoy a constantly changing experience. In particular, the sale of limited edition and collaboration models will help diversify revenue streams. The service will provide a new experience to consumers who value fashion and individuality.

[0084] Marketing strategies include partnering with influencers and promoting the service at events to increase market penetration, and user-participation design contests and limited-time campaigns to strengthen brand engagement.

[0085] As described above, according to the first embodiment, the user can freely change the color of the crystal 42, dial, second hand, etc. of the watch. In other words, the user can change the decoration of the watch 4 to suit their taste. This makes it possible to customize the watch to suit, for example, a specific event or everyday fashion. In addition, the UV protection function prevents deterioration of the watch's internal components, enabling it to be used for a long period of time.

[0086] This color conversion system also applies a colorless, transparent, UV-sensitive dye to the watch's dial and second hand, temporarily changing the user's selected color when exposed to UV light. The color conversion layer of the watch 4 has a three-layer structure, with the top glass layer equipped with UV protection to prevent the harmful effects of UV light. The second layer contains a UV-sensitive dye, which allows the dial and second hand to display the color selected by the user through an app on the mobile device 1 when exposed to UV and LED light from the lighting device 2 (a dedicated UV irradiation device). The color is retained for 24 hours to one week, after which the watch returns to its transparent state, enabling use in a variety of situations.

[0087] The business will have a product line and a target market. It is possible to develop a product line that covers a wide range of categories, such as fashion watches, business watches, and sports watches. The target market is diverse, ranging from fashion-conscious young people to business people.

[0088] The sales channels and pricing strategy are expected to be sold through the company's own online store and major online marketplaces. Retail sales will be primarily at select shops and watch specialty stores. Furthermore, profits can be maximized by setting premium prices and selling limited edition models.

[0089] A subscription service could offer new watch face designs and colors on a regular basis for a monthly fee, allowing for special designs to be tailored to specific seasons or events, increasing customer loyalty.

[0090] The service described above provides a new experience for users to customize the color of the watch face 4, offering a wide range of options to suit fashion and lifestyles. This provides users with a new way to express their individuality and is expected to increase their competitiveness in the market.

[0091] Next, a second embodiment (nail example) of a color conversion system including the lighting device shown in FIG. 3 will be described with reference to FIGS. 17 to 19 . First, a color conversion system including the lighting device of the second embodiment will be described with reference to FIG. 17 . FIG. 17 is a diagram showing a second embodiment of a color conversion system including the lighting device shown in FIG. 3 . The lighting device 2 of the second embodiment performs color conversion processing on nail polish to be painted on or attached to the fingernails of a person's hand. Note that in the following embodiments, the color conversion layer applied to the medium will be either the two-layer color conversion layer 60 shown in FIG. 3 or the three-layer nail polish type 401 shown in FIG. 18 , depending on whether the object to be colored is transparent or not. Furthermore, the mobile terminal 1 is the same as that shown in FIGS. 1 to 3 above, and its description will be omitted.

[0092] As shown in Fig. 17 , the lighting device 2 of the second embodiment has a hand rest 172 disposed on the side of the device body. Furthermore, a plurality of pins 173 are arranged in a comb-like pattern at predetermined intervals in an opening provided on the side of the device body where the hand rest 172 is disposed. The plurality of pins 173 are used to insert fingers 181 into the gaps between the pins 173, i.e., to fix the depth of the fingers 181 within the case (their positions). This fixes the positions of the nails 182 even when the fingers are spread apart.

[0093] In this lighting device 2, a light source (UV light source 55 or LED light source 56) is placed inside the case above the position of each nail 182, and the position of the nail 182 is automatically fixed by simply inserting a person's finger into the gap between the pins 173 (without having to move the hand to align it), so that light from the light source is evenly irradiated onto each nail 182, and the nail 401 placed on the surface of the nail 182 can be colored.

[0094] Here, the nail 401 will be described with reference to FIG. 18 . FIG. 18 is a diagram schematically illustrating the layered structure of a nail applied to the nail of a finger that is the target (predetermined medium) for color conversion by the lighting device of FIG. 17 . FIG. 19 is a diagram illustrating the absorption spectrum of a UV absorber, the spectrum of illumination for coloring a photochromic layer, and the absorption spectrum of a polymerization initiator for a visible light curable resin. As shown in FIG. 18 , when the predetermined medium is, for example, a nail 401 applied to the nail 182 of a human finger 181, the nail 401 has a three-layer structure in which a base layer 63, a photochromic layer 61, and a coating layer 64 are layered in this order from the side closest to the nail 182, as shown in FIG. 18 . That is, in this second embodiment, the base layer 63 is disposed between the photochromic layer 61 and the nail 182, and the nail 401 itself functions as a color conversion layer.

[0095] The base layer 63 is a white coating film made primarily of, for example, ultraviolet curing resin. The base layer 63 shields the color of the nail 182 (the object to be coated) and prevents the color of the photochromic layer 61 from mixing with the color of the surface of the nail 182. Since the nail 182 is almost pink, by disposing the base layer 63 between the color (pink) of the nail 182 and the photochromic layer 61, it is possible to prevent the pink color of the nail 182 from mixing with the color of the photochromic layer 61.

[0096] The ultraviolet curable resin may be, for example, an acrylic resin. The acrylic resin contains a polymerization initiator that absorbs UV light having a wavelength of at least one of 365 nm and 405 nm. A commercially available polymerization initiator may be used as the polymerization initiator.

[0097] The polymerization initiator is excited by the absorbed light, undergoes intramolecular cleavage to generate radicals, which react with the double bonds of the acrylic resin to initiate polymerization. The base layer 63 also has the effect of improving adhesion between the nail 401 and the nail 182.

[0098] The photochromic layer 61 is mainly made of an ultraviolet curable resin and contains a photochromic material. The curable resin is, for example, an acrylic resin, similar to the base layer 63. The acrylic resin contains a polymerization initiator that absorbs UV light having at least one of the wavelengths of 365 nm and 405 nm.

[0099] As the polymerization initiator, a commercially available polymerization initiator can be used. As the photochromic material, for example, diarylethene shown in FIG.

[0100] The photochromic layer 61 is mainly made of an ultraviolet curable resin, which has a solubility parameter similar to that of the photochromic material, for example, within 20% of the solubility parameter before UV light irradiation.

[0101] This allows the UV-curable resin and the photochromic material to have good compatibility and not separate from each other. The photochromic layer 61 is formed by applying a UV-curable resin containing a photochromic material onto the base layer 63 and then irradiating it with UV light having a wavelength of 365 nm.

[0102] The coating layer 64 is a UV light absorbing layer that absorbs UV light in a predetermined wavelength range, for example, as shown in FIG.

[0103] The coating layer 64 contains, for example, a pigment that absorbs UV light, an organic substance such as a stilbene derivative, and various types of ultraviolet absorbers. From the various ultraviolet absorbers, it is possible to appropriately select a material suitable as an ultraviolet absorber (to be contained in the coating layer 64) that is suitable for the medium.

[0104] The photochromic material has an absorption spectrum 76 before irradiation with UV light, as described in FIG. 4, and therefore develops color when irradiated with UV light that matches the absorption spectrum among the light that has passed through the coating layer 64.

[0105] A portion of the UV light emitted from the lighting device 2 (for example, ultraviolet light having a wavelength of 325 nm to 430 nm) is absorbed by the coating layer 64. Light with a wavelength shorter than 325 nm passes through the coating layer 64 and is absorbed by the photochromic material of the underlying photochromic layer 61, so that when irradiated with light with a wavelength shorter than 325 nm, the photochromic layer 61 develops color. As the photochromic material, for example, diarylethene is used.

[0106] The coating layer 64 shown here contains a photocurable resin, a UV absorbent, and a polymerization initiator. The photocurable resin used in the coating layer 64 is, for example, an acrylic resin. The UV absorbent is, for example, a stilbene derivative.

[0107] The UV absorber absorbs light with wavelengths of, for example, 325 nm to 430 nm, as shown by line 191 in the graph of Fig. 19. A UV absorber having such properties can be obtained by appropriately selecting a material commercially available from a film manufacturer or chemical manufacturer as a specific ultraviolet wavelength absorber.

[0108] The polymerization initiator contained in the coating layer 64 not only absorbs UV light having at least one of the wavelengths of 365 nm and 405 nm, but also has an absorption edge in the visible light region (longer wavelengths) of, for example, 430 nm or longer, outside the light absorption region of the UV absorber, as shown by line 192 in the graph in FIG. 19 . Therefore, the photocurable resin cures with visible light and is one of the photocurable resins commonly referred to as visible light curable resins. Line 193 in the graph in FIG. 19 represents the spectrum of sunlight at the Earth's surface. Line 194 in the same graph represents the illumination spectrum for coloring the photochromic layer 61, and has an absorption edge on the shorter wavelength side of the wavelength band absorbed by the UV absorber (line 191 in FIG. 19 ).

[0109] The coating layer 64 is cured by irradiating a mixture of a photocurable resin, a UV absorber, and a polymerization initiator with light that cleaves the polymerization initiator. The absorption edge of the polymerization initiator is, for example, 450 nm, in the blue region, and its light absorption is also lower than in other wavelength regions.

[0110] The coating layer 64 has the ability to absorb ultraviolet light, and is therefore cured with light having a wavelength of, for example, 430 nm to 450 nm. For example, curing with LED light having a wavelength of 440 to 450 nm is preferred. To prevent inhibition of polymerization initiation by oxygen and to promote curing, it is preferable to perform polymerization by irradiating the layer with light in a nitrogen atmosphere.

[0111] Here, it is preferable to also irradiate UV light having a wavelength of at least one of 365 nm and 405 nm, which may seem contradictory since the coating layer 64 contains an ultraviolet absorber that absorbs light of this wavelength.

[0112] However, it is effective in curing the surface and the portion close to the surface of the coating layer 64. In the vicinity of the surface of the coating layer 64, UV light having at least one of the wavelengths of 365 nm and 405 nm that is not completely absorbed by the ultraviolet absorber is irradiated onto the polymerization initiator. Therefore, the polymerization initiator is cleaved by UV light having at least one of the wavelengths of 365 nm and 405 nm.

[0113] Furthermore, compared to visible light, UV light has a higher energy level and is more efficient at cleaving the polymerization initiator, so UV light having at least one of the wavelengths of 365 nm and 405 nm is effective for the portion of the coating layer 64 close to the surface.

[0114] Polymerization does not proceed easily on the surface of the coating layer 64 because oxygen in the air inhibits cleavage. Curing of the surface of the coating layer 64 can be promoted by irradiating it with UV light having at least one of the wavelengths of 365 nm and 405 nm.

[0115] The relationship between the optical properties of each of the above materials will now be summarized. It is important for the UV absorber to absorb ultraviolet rays from sunlight, for example, light of 325 nm to 430 nm. The photochromic material becomes colored by irradiation with light in a wavelength range shorter than the absorption wavelength band of the above UV absorber, for example, UV light with a wavelength of 325 nm.

[0116] On the other hand, as described above, the absorption edge of the polymerization initiator in the coating layer 64 includes light in a wavelength range longer than the absorption wavelength band of the UV absorber, for example, wavelengths from 440 nm to 450 nm. That is, with respect to the absorption wavelength band of the UV absorber, the photochromic material has an absorption range on the short wavelength side, and the polymerization initiator in the coating layer has an absorption range on the long wavelength side.

[0117] 19, line 193 indicates the spectrum of sunlight on the ground, and line 194 indicates the spectrum of the illumination for coloring the photochromic layer 61.

[0118] Next, the nail formation and color conversion process in the second embodiment will be described with reference to Fig. 20. Fig. 20 is a flowchart showing the nail formation and color conversion process in the color conversion system of the second embodiment. <Nail Formation Process>

[0119] In this case, first, in step S201, an ultraviolet curable resin that will be the foundation of the base layer 63 is applied to the surface of the nail 182.

[0120] Next, in step S202, the ultraviolet curable resin is cured by irradiating it with UV light having at least one of wavelengths of 365 nm and 405 nm, thereby forming the base layer 63.

[0121] Next, in step S203, an ultraviolet curable resin to which a photochromic material has been added is applied onto the base layer 63 (ultraviolet curable resin) to form the photochromic layer 61.

[0122] Then, in step S204, the ultraviolet curable resin is cured by irradiating it with UV light having at least one of wavelengths of 365 nm and 405 nm, thereby forming the photochromic layer 61.

[0123] At this time, the photochromic material contained in the photochromic layer 61 reacts to the UV light and develops color. This color development is a secondary effect, but the amount of ultraviolet light irradiation (irradiation intensity, irradiation time, etc. of UV light) is controlled so that the color development is sufficient.

[0124] Next, in step S205, a visible light curable resin containing an ultraviolet absorber is applied to form a coating layer. The UV absorber absorbs light in the wavelength range of 325 nm to 430 nm, for example. The visible light curable resin contains a polymerization initiator that is cleaved by light in the long wavelength range that is not completely absorbed by the ultraviolet absorber, for example, light with a wavelength of 440 to 450 nm.

[0125] Next, in step S206, the visible light curable resin is cured by irradiating it with visible light having a wavelength longer than the absorption wavelength of the UV absorbent, for example, light of 440 to 450 nm, from an LED light source.

[0126] In step S206, at least one of wavelengths of 365 nm and 405 nm may be irradiated, because this can promote hardening of the surface of the coating layer 64.

[0127] The nail 401 is formed by the processes of steps S201 to S206. In step S204, the photochromic layer 61 is colored. However, as described above, this coloring is secondary, and the nail is colored in any color (e.g., black) that is unrelated to the intention.

[0128] <Color Change Process> In step S207, the photochromic material colored in step S204 is faded and reset by irradiating it with red (R), green (G), or blue (B) visible light in accordance with the absorption wavelengths of the photochromic material whose molecular structure changes when irradiated with light.

[0129] Next, in step S208, the photochromic material is colored by irradiating it with UV light that colors the photochromic material, that is, UV light with a short wavelength that is not absorbed by the coating layer 64, for example, a wavelength of 325 nm.

[0130] Furthermore, in step S209, a predetermined color is realized by selectively irradiating each of red (R), green (G), and blue (B) visible light with controlled intensity and duration in accordance with the absorption wavelength of the colored photochromic material, and the process ends.

[0131] As described above, according to the second embodiment, once the nail 401 is formed on the nail 182 of a person's finger 181, the color can be changed to a desired color by the lighting device 2 from then on. In particular, it becomes possible to change the color of the nail 401 to match the clothing or the environment in which the person is going (playing sports, being invited to a party, working at an office, etc.).

[0132] <Other Examples> The base layer 63 is intended to improve the adhesion of the nail 401 as a whole, and also to serve as a base to prevent the color of the nail 182 from mixing with the photochromic layer 61. As shown in Figures 1 and 3, when the object to be colored needs to be transparent to show the dial underneath, such as the crystal 42 of a watch 4, the base layer 63 does not need to be formed.

[0133] In the above example, the nail 401 is formed by sequentially applying layers to the nail 182. However, the photochromic layer 61 and the coating layer 64 may be integrated. In this case, a visible light-curable resin is used as the main material, and the visible light-curable resin contains an ultraviolet absorber and a photochromic material. After applying the visible light-curable resin to the nail 182, the visible light-curable resin is irradiated with visible light that is not completely absorbed by the ultraviolet absorber. This hardens the visible light-curable resin, forming the nail 401. However, in this case, the photochromic material is present on the surface of the nail 401. In this state, when exposed to sunlight, UV light may reach the photochromic material without being absorbed by the ultraviolet absorber, potentially causing the photochromic material to unintentionally color. For this reason, it is advisable to take measures (such as a coating) to block UV light.

[0134] Next, a third embodiment (an example of a general-purpose machine) of a color conversion system including the lighting device shown in FIGS. 1 and 3 will be described with reference to FIG. 21 . FIG. 21 is a diagram showing a third embodiment of a color conversion system including the lighting device shown in FIG. 3 . As shown in FIG. 21 , in the case of a color conversion system including the lighting device 2 of the third embodiment, the predetermined medium 402 may be any object as long as it is small enough to fit into the internal space of the lighting device 2, and the coloring (color conversion) process is performed on, for example, a pot, a cup, a container, a toy, etc. The mobile terminal 1 is the same as that shown in FIGS. 1 to 3 above, and its description will be omitted.

[0135] The illumination device 2 of the third embodiment has a case that is configured with a left side surface, a right side surface, a top surface, and a back surface. A light source unit including a UV light source 55 and an LED light source 56 is disposed on each of the top surface 211, left side surface 212, and right side surface 213. A heat sink 57 and a fan 58 are provided on the exterior of the light source unit. Handles 214 are fixed to the light source unit, protruding perpendicularly from each surface. Guide mechanisms 215 are provided on each surface to engage with the handles 214 and enable the light source unit to slide. In the case of this illumination device 2, a user can adjust the illumination distance between the light source and a predetermined medium 402 by holding each handle 214 and moving the light source unit up and down (in the direction of the arrow Y) and left and right (in the direction of the arrow X).

[0136] In the case of the lighting device 2 of this third embodiment, functional elements other than the light source are arranged in an external control device (not shown). The functional elements are the communication unit 51, light source driving unit 52, power supply unit 53, etc. shown in FIG. 3. Therefore, the lighting device 2 and the control device are connected by a communication line and a power cord. Note that control information from the mobile terminal 1 is transmitted to the lighting device 2 via the control device. The operation is the same as in the first embodiment.

[0137] The color conversion system including the lighting device 2 of the third embodiment can accommodate a coloring object (predetermined medium 402) of a certain size, and can achieve high output by using heat dissipation measures such as the heat sink 57 and fan 58. This makes it possible to color objects larger than the watch 4, nails 401, etc., and can be used for general-purpose purposes.

[0138] Next, a fourth embodiment of a color conversion system (in which the object to be colored is eyeglasses) including the illumination device shown in FIGS. 1 and 3 will be described with reference to FIG. 22 . FIG. 22 is a diagram illustrating a fourth embodiment of a color conversion system including the illumination device shown in FIG. 1 . As shown in FIG. 22 , in the illumination device 2 of the fourth embodiment, the predetermined medium is eyeglasses 411, and the two-layer color conversion layer 60 shown in FIG. 3 is applied as the color conversion layer formed on the eyeglasses 411. The illumination device 2 is composed of a case 221 and a lid 222 that can be removed from the case 221. The interior of the case 221 is divided into multiple compartments by partitions, and storage spaces 223 are provided for each part 412 of the eyeglasses 411. The lid 222 is equipped with a UV light source 55 and an LED light source 56 shown in FIG. 3 . The color specification screen of the portable terminal 1 also allows color specification for each part 412 in addition to the entire eyeglasses 411. The functional configuration of the portable terminal 1 is otherwise similar to that of the first embodiment (see FIG. 3 ), and therefore a description thereof will be omitted.

[0139] According to the color conversion system including the illumination device 2 of the fourth embodiment, coloring (color conversion) can be performed on the glasses 411 alone as well as on each of the separated parts.

[0140] Next, a fifth embodiment of a color conversion system including the lighting device shown in FIGS. 1 and 3 (using jewelry as an example of the object to be colored) will be described with reference to FIG. 23 . FIG. 23 is a diagram illustrating a fifth embodiment of a color conversion system including the lighting device shown in FIG. 1 . As shown in FIG. 23 , in the fifth embodiment, the predetermined medium is jewelry 421, and the lighting device 2 is composed of a case 231 with an opening at the top and a lid 232 that can open and close the opening of the case 231. The case 231 has a seat 233 inside to support the ring portion of the jewelry 421. The lid 232 is equipped with the UV light source 55 and LED light source 56 shown in FIG. 3 . The functional configuration of the mobile terminal 1 is the same as that of the first embodiment (see FIG. 3 ), and therefore a description thereof will be omitted.

[0141] The color conversion system including the lighting device 2 of the fifth embodiment can color (convert) the jewelry 421. Furthermore, by installing (introducing) the color conversion system in a store that sells the jewelry 421, it is possible to increase the frequency of customers visiting the store, and an increase in sales of other products can also be expected.

[0142] Next, a sixth embodiment of a color conversion system including the lighting device shown in FIGS. 1 and 3 (in which the object to be colored is a contact lens) will be described with reference to FIG. 24 . FIG. 24 is a diagram showing the sixth embodiment of a color conversion system including the lighting device shown in FIG. 1 . As shown in FIG. 24 , in the sixth embodiment, the predetermined medium is a contact lens 431, and the lighting device 2 is composed of a case 241 having an opening at the top and a lid 242 that can open and close the opening of the case 241. The case 241 has a storage section 243 inside for placing the contact lens 431. The lid 242 is equipped with the UV light source 55 and LED light source 56 shown in FIG. 3 . The functional configuration of the mobile terminal 1 is the same as that of the first embodiment (see FIG. 3 ), and therefore a description thereof will be omitted.

[0143] The contact lens 431 is provided with a three-layer color conversion layer formed on the surface or inside the lens. The color conversion layers are arranged in order of proximity to the eyeball as Layer 1 (bottom layer), Layer 2 (middle layer), and Layer 3 (top layer). Layer 2 (middle layer) contains a UV-reactive transparent pigment layer. Layer 3 (top layer) is a layer that blocks UV light, preventing color change due to UV light and protecting eye health.

[0144] In the case of this contact lens 431, the color specified by the user through the application on the mobile terminal 1 appears on the contact lens 431, and returns to transparency after a certain period of time.

[0145] This contact lens 431 is a contact lens that uses a transparent pigment that reacts to specific UV light, and the user selects the color through an app on the mobile terminal 1, and the color is produced by the dedicated lighting device 2 (UV irradiation device) described above.

[0146] The color developed by the contact lens 431 is maintained for 24 hours to one week, after which it returns to its transparent state, reducing the hassle of disposable lenses. This allows users to enjoy a wide variety of colors.

[0147] By providing a color conversion service including the contact lens 431 and the lighting device 2 described above, a new experience can be provided to users, and there is broad market potential in the fields of fashion, medicine, and sports.

[0148] As a marketing strategy, the company will promote the service in the market through partnerships with influencers and promotions at events. It will also hold trial sessions for the service at venues such as fashion shows and sporting events, offering users special experiences that will attract their interest.

[0149] The color conversion system including the lighting device 2 of the sixth embodiment can color (convert) contact lenses 431 according to various situations. Specifically, users can change the color of their contact lenses to match their daily fashion or events. In medical applications, the UV-cut function can protect eye health while providing visual changes. In sports applications, the system can adjust vision according to specific situations, which is expected to improve visibility and performance. Furthermore, installing (introducing) the color conversion system in a store that sells contact lenses 431 can increase the frequency of customers and potentially increase sales of other products.

[0150] Here, a business model using the color conversion system of the sixth embodiment will be described. This business model provides a service for selling contact lenses using a special transparent pigment. A service provider sells colors to users via a mobile application, and the users select and purchase colors via the mobile application. The service provider then changes the color of the contact lenses to match the color purchased by the users using a color conversion system including a lighting device 2 (UV irradiation device) and provides the lenses to the users. The color of the contact lenses is maintained for 24 hours to one week, after which they return to transparency. This contact lens color-changing service can be applied to a wide range of applications, including fashion, medical, and sports.

[0151] Next, a seventh embodiment of a color conversion system including the lighting device shown in FIGS. 1 and 3 (in which the object to be colored is a shoe) will be described with reference to FIG. 25 . FIG. 25 is a diagram showing the seventh embodiment of a color conversion system including the lighting device shown in FIG. 1 . As shown in FIG. 25 , in the seventh embodiment, the predetermined medium is a shoe 441, and the lighting device 2 is composed of a case 251 with an opening at the top and a lid 252 that fits into the opening of the case 251. The case 251 has a deep storage section 253 inside to store the shoe 441. The case 251 and the lid 252 are equipped with the UV light source 55 and the LED light source 56 shown in FIG. 3 . The functional configuration of the mobile terminal 1 is the same as that of the first embodiment (see FIG. 3 ), and therefore a description thereof will be omitted.

[0152] The color conversion system including the lighting device 2 of the seventh embodiment can color (convert) the shoes 441. Furthermore, by installing (introducing) the color conversion system in a store that sells the shoes 441, it is possible to increase the frequency of customers visiting the store, and it is also possible to expect an increase in sales of other products.

[0153] Next, an eighth embodiment of a color conversion system including the lighting device shown in FIGS. 1 and 3 (in which the object to be colored is a bag) will be described with reference to FIG. 26 . FIG. 26 is a diagram illustrating the eighth embodiment of a color conversion system including the lighting device shown in FIG. 1 . As shown in FIG. 26 , in the eighth embodiment, the predetermined medium is a bag 451, and the lighting device 2 is composed of a case 261 having an opening at the top and a lid 262 that can open and close the opening of the case 261. The case 261 has a deep storage compartment 263 inside to store the bag 451. The case 261 and the lid 262 are equipped with the UV light source 55 and the LED light source 56 shown in FIG. 3 . The functional configuration of the portable terminal 1 is the same as that of the first embodiment (see FIG. 3 ), and therefore a description thereof will be omitted.

[0154] The color conversion system including the lighting device 2 of the eighth embodiment can color (convert) the bag 451. Furthermore, by installing (introducing) the color conversion system in a store that sells the bag 451, it is possible to increase the frequency of customers visiting the store, and it is also possible to expect an increase in sales of other products.

[0155] Next, a ninth embodiment of a color conversion system including the lighting device shown in FIGS. 1 and 3 (in which the object to be colored is a vehicle) will be described with reference to FIG. 27 . FIG. 27 is a diagram illustrating a ninth embodiment of a color conversion system including the lighting device shown in FIG. 1 . As shown in FIG. 27 , in the ninth embodiment, the predetermined medium is a color conversion layer (having a three-layer structure similar to the example of the nail 401 in FIG. 18 ) formed on the exterior surface of the vehicle 461, and the lighting device 2 has a housing 271 with an entrance on the side. The interior of the housing 271 is a garage 272 for storing the vehicle 461. The UV light source 55 and LED light source 56 shown in FIG. 3 are arranged within the garage 272. The functional configuration of the mobile terminal 1 is the same as that of the first embodiment (see FIG. 3 ), and therefore a description thereof will be omitted.

[0156] According to the color conversion system including the lighting device 2 of the ninth embodiment, it is possible to color (color convert) the vehicle 461. Furthermore, by installing (introducing) the color conversion system in a store that handles the vehicle 461, it is possible to increase the frequency of customers visiting the store, and an increase in sales of other products can also be expected.

[0157] Here, a business model using the color conversion system of the ninth embodiment will be described. The business model provides a service for changing the exterior color of a vehicle, and in particular allows for customization of the exterior color of a vehicle at the time of purchase and after purchase. One possible business model is an instant customization service for individuals. This service allows a prospective buyer to visit a dealership, select a color from a color sample, and then provide a test drive vehicle that can be customized to that color within a few minutes. This allows the buyer to have a concrete image of the color before purchasing and to instantly experience that color.

[0158] Another possible business model is a post-purchase subscription service for vehicles. In this service, users purchase a white car painted with a transparent pigment and can change the color whenever they want by visiting a dealership based on the subscription agreement. This service allows users to freely change the color of their car to suit their mood, the season, or a special event. Another possible business model is a rapid response service for businesses. In this service, corporate customers can set custom colors for a large number of vehicles for a specific event or campaign, and the colors are quickly applied to the large number of vehicles.

[0159] According to the business model described above, consumers can not only experience the car's color in real time during the purchasing decision process, but also enjoy the flexibility of changing the color at will after purchase, while dealers can increase customer satisfaction, increase sales opportunities, and strengthen their marketing activities.

[0160] Another possible business model would be to provide a service that converts offline color information into light information and allows users to buy and sell colors through an application installed on a smartphone or a web app accessible via a web browser. This service allows users who purchase a color to change the color of any product containing pigment, such as cars, clothes, bags, jewelry, eyeglass frames, lenses, home appliances, nails, foundation, eyeliner, or hair color, to their liking by connecting the purchased color to a light-emitting device via short-range data communication or a wireless local network and sending and receiving signals.

[0161] In addition, because it is a substitute for pigments, it will be possible to change the color of the paint on trains, airplanes, ships, etc. This will create a new platform market for purchasing digital colors.

[0162] Color information is converted into light information, and the light information is incorporated as data on the blockchain, enabling traceability of who has acquired the light information for that color, as well as market development for color monopoly, etc. The content of the light information is specified by a combination of the irradiation time, irradiation intensity (output), irradiation range, ratio, etc. for each of R, G, and B.

[0163] <Business model> In terms of business model, for example, by managing colors as digital data, there is no need to keep actual colors in stock in stores. The cost per color purchased through an application is only the application distribution platform usage fee (e.g., an online application market) and payment processing fee (e.g., X%), which increases the profit margin for the company.

[0164] Colors can be traded in the form of a certain amount of yen per color, and points can also be charged (charged) and used to purchase colors. The points system allows points to be exchanged with affiliated companies, broadening the scope for users. A function will be provided that allows users to personally transfer or gift the colors they have purchased. Points are consumed to transfer colors, which also generates profits.

[0165] <How to sell colors> - Users will be able to purchase colors using the device itself (UV irradiation device) and a smartphone app. Users have a digital palette. They load colors as they go. - Charges are based on gauges (amount, points). They can create their own colors. - For example, 24 colors are assumed as basic colors, but additional colors within the range that humans can recognize can be distributed. - Users will basically purchase colors through the app. - It has the ability to synthesize (edit) colors as digital data. - Colors exclusive to that company will be provided. Colors will be linked to location information and set to be available for purchase only there. - New colors will be available digitally whenever they are released. Users can download new colors at any time. - It is possible to purchase individual colors. It is also possible to purchase all 24 colors at once. It is also possible to select and purchase multiple colors. - It is also possible for companies to have exclusive control of color information as a strategy (contract).

[0166] <Charging Method> - The service can be provided as a subscription contract (fixed monthly fee) bundled with the device. - It is also possible to charge a fee (fee) when changing the color. - In-app purchases plus additional features (e.g., gradients) can be sold as an option. - It is also preferable to split the revenue (profit) of the app. Billing section, color setting section, color reception section, color fee setting section (as a margin for development in collaboration with other companies, rather than as an in-house product). - As each user's living environment is different, a product guarantee is provided for the guaranteed time if the color disappears within the guaranteed time. For example, for nails 182 (see Figure 18), a guarantee of approximately 12 hours is provided, and for hair, a guarantee of approximately one week is provided.

[0167] <Usage> - Applications include paint for vehicles such as cars and airplanes, clothing, bags, jewelry, eyeglass frames, lenses, and home appliances. It can also be used in any pigmented product, such as nail polish, foundation, eyeliner, and hair color. By holding a product made with this technology, you can change its color at any time. - It can be used as a product tester to check the color yourself and attract customers to the store to purchase the actual product. - When a company distributes exclusive colors, a 2D code is distributed and the color is added to a digital palette by scanning the 2D code. - Each time the app is used, secondary information (gender, location, time, product, color, and irradiation location) is acquired by the service provider's server. The server then uses the acquired data to provide trend information to the app on the user's mobile device. Information such as the type of person who purchased or used a certain color is included.

[0168] <Features> The color conversion system is characterized by converting specified color information into light information (light source control information). This is specified by a combination of the irradiation time, output, irradiation range, and ratio of each of R, G, and B. This is what differentiates it from inkjet printers, etc. The color conversion system can change the structure and irradiation conditions of the lighting device 2 (irradiation device) depending on the time the color is to be retained.

[0169] Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within the scope of achieving the object of the present invention are included in the present invention.

[0170] In the above-described embodiment, an example was described in which the specified medium was a watch, but it could also be, for example, nails, glasses, jewelry, a bag, a vehicle, etc., and a housing corresponding to the size and shape of each medium can be prepared, and light can be irradiated from the surrounding area while each medium is housed in the housing.

[0171] Furthermore, for example, the above-described series of processes can be executed by hardware or software. In other words, the functional configuration of FIG. 3 is merely illustrative and is not particularly limited. That is, it is sufficient for the color conversion system to have the functionality to execute the above-described series of processes as a whole, and the functional blocks used to realize these functions are not particularly limited to the example of FIG. 3. Furthermore, the locations of the functional blocks and the information in the storage unit are not particularly limited to those shown in FIG. 3 and may be arbitrary. For example, at least a portion of the functional blocks and the information in the storage unit required to execute various processes may be transferred to a lighting device, a cloud on a network, or the like. Conversely, the functional blocks and information of the lighting device may be transferred to a mobile terminal, a cloud on a network, or the like. Furthermore, one functional block may be configured as a single piece of hardware, a single piece of software, or a combination thereof.

[0172] When a series of processes is executed by software, the programs constituting the software are installed onto a computer or the like from a network or a recording medium. The computer may be a computer incorporated into dedicated hardware. The computer may also be a computer capable of executing various functions by installing various programs, such as a server, a general-purpose smartphone, or a personal computer.

[0173] The recording medium containing such a program may be composed of not only a removable medium (not shown) that is distributed separately from the device main body in order to provide the program to users, etc., but also a recording medium that is provided to users, etc. in a state where it is pre-installed in the device main body.

[0174] In this specification, the steps describing the program recorded on the recording medium include not only processes performed in chronological order, but also control processes that are not necessarily performed in chronological order but are executed in parallel or individually. Also, in this specification, the term "system" means an overall device composed of multiple devices or multiple means, etc.

[0175] In summary, the color conversion system to which the present invention is applied is sufficient if it has the following configuration, and can take on a variety of different embodiments. That is, a color conversion system to which the present invention is applicable is: (1) a color conversion system for converting the color of a predetermined medium (e.g., the crystal 42 of the watch 4 in Figures 1 and 3), comprising: the predetermined medium (e.g., the crystal 42 of the watch 4 in Figure 1) having a photochromic layer (e.g., the photochromic layer 61 in Figure 3); an illumination device (e.g., the illumination device 2 in Figure 3) that irradiates the predetermined medium (e.g., the crystal 42 of the watch 4 in Figures 1 and 3) with ultraviolet light (UV light) from an ultraviolet light source (e.g., the UV light source 55 in Figure 3) and blue, green, and red visible light from blue, green, and red visible light sources (e.g., the LED light sources 56a, 56b, 56c in Figure 3); and an information processing device (e.g., the mobile terminal 1 in Figure 3) that controls the irradiation of the visible light and ultraviolet light by the illumination device (e.g., the illumination device 2 in Figure 3). The photochromic layer (e.g., photochromic layer 61 in FIG. 4 ) has three types of photochromic materials that develop colors of yellow, magenta, and cyan, respectively, when irradiated with ultraviolet light from the lighting device (e.g., lighting device 2 in FIG. 3 ), and the information processing device (e.g., mobile terminal 1 in FIG. 3 ) causes the predetermined medium to develop colors by irradiating ultraviolet light from the ultraviolet light source (e.g., UV light source 55 in FIG. 3 ) of the lighting device (e.g., lighting device 2 in FIG. 3 ), and a color conversion control means (e.g., color conversion control unit 32 in FIG. 3 ) that performs control to convert a predetermined medium (e.g., the crystal 42 of the watch 4 in FIGS. 1 and 3 ) into the predetermined color (a color that has been set in advance) by irradiating the predetermined medium (e.g., the crystal 42 of the watch 4 in FIGS. 1 and 3 ) with blue, green, and red visible light from each of the blue, green, and red visible light sources (e.g., LED light sources 56 a, 56 b, and 56 c in FIG. 3 ) under conditions (irradiation intensity and irradiation time of each of the three visible light sources) required to convert the predetermined color. This allows the predetermined medium (e.g., the crystal 42 of the watch 4 in FIGS. 1 and 3 ) to be converted into the predetermined color (a color designated by the user).

[0176] (2) The predetermined medium (e.g., crystal 42 of watch 4 in Figures 1 and 3) further has a coating layer (e.g., coating layer 62 in Figure 3) that absorbs ultraviolet light of wavelengths (325 nm to 430 nm) contained in sunlight at the Earth's surface and transmits ultraviolet light of a predetermined wavelength (325 nm) or less, and the ultraviolet light irradiated from the lighting device (e.g., lighting device 2 in Figure 3) contains at least components of wavelengths (e.g., blue: 430 nm, green: 525 nm, red: 650 nm) set to cause the predetermined medium (e.g., crystal 42 of watch 4 in Figure 3) to color within a range of wavelengths not greater than the predetermined wavelength that is transmitted through the coating layer (e.g., coating layer 62 in Figure 3). In this way, by providing a coating layer (for example, coating layer 62 in FIG. 3) that absorbs ultraviolet light of wavelengths (325 nm to 430 nm) contained in sunlight on the ground and transmits ultraviolet light of a predetermined wavelength (325 nm) or less, it is possible to prevent fading due to light from sunlight on the ground, and therefore the color after conversion processing can be maintained in a normal usage environment.

[0177] (3) The coating layer (e.g., coating layer 64 in FIG. 18) includes a photocurable resin, an ultraviolet absorber, and a polymerization initiator, wherein the ultraviolet absorber absorbs ultraviolet rays in a light absorption range (range: 325 nm to 430 nm) that includes the wavelengths contained in sunlight from the Earth's surface, and the polymerization initiator absorbs the ultraviolet rays of the color-producing wavelength (ultraviolet rays with at least one of a wavelength of 365 nm and a wavelength of 405 nm) and has an absorption edge in a predetermined visible light range (wavelength range: a wavelength range of 430 nm or more) outside the light absorption range (range). Thus, irradiation with visible light with a wavelength of 440 nm to 450 nm causes cleavage of the polymerization initiator, thereby helping to cure the photocurable resin and accelerating the curing of the coating layer.

[0178] (4) The photochromic layer (e.g., photochromic layer 61 in FIG. 3) contains an ultraviolet curing resin mixed with a photochromic material, and the ultraviolet curing resin has a solubility parameter difference (e.g., a difference of 20% or less) such that the ultraviolet curing resin and the photochromic material do not separate from each other before being irradiated with ultraviolet light from the ultraviolet light source of the lighting device. This allows for good compatibility between the ultraviolet curing resin and the photochromic material so that they do not separate from each other.

[0179] (5) The predetermined medium is an accessory worn by a person (for example, a watch 4 worn on the wrist (see FIG. 1), a nail 401 placed on the nail 182 of a person's finger 181 (see FIG. 18), eyeglasses 411 worn on the face (ears) (see FIG. 22), jewelry 421 worn on a finger (see FIG. 23), contact lenses 431 worn on a person's eyes (see FIG. 24), shoes 441 worn by a person (see FIG. 25), a bag 451 carried by a person (see FIG. 26), a vehicle 461 (see FIG. 27), etc.). In this way, by changing the color of an accessory worn by a person, a person can wear an accessory of a color that matches the mood or outfit of the day, or the environment of the destination, or can act (go out, etc.) with the accessory. Furthermore, a service for changing the color of an accessory can be provided.

[0180] (6) A color conversion method to which the present invention is applicable is a color conversion system for converting the color of a predetermined medium (e.g., the crystal 42 of the watch 4 in Figures 1 and 3), the predetermined medium (e.g., the crystal 42 of the watch 4 in Figures 1 and 3) having a photochromic layer (e.g., the photochromic layer 61 in Figure 4), an illumination device (e.g., the illumination device 2 in Figure 3) that irradiates the predetermined medium with ultraviolet light from an ultraviolet light source (e.g., the UV light source 55 in Figure 3) and red, green, and blue visible light from red, green, and blue visible light sources (e.g., the LED light sources 56a to 56c in Figure 3), respectively, and an information processing device (e.g., the portable terminal 1 in Figure 3) that controls the irradiation of the illumination device (e.g., the illumination device 2 in Figure 3), the color conversion method being executed by the information processing device (e.g., the portable terminal 1 in Figure 3) of the color conversion system, In a case where the photochromic layer (e.g., the photochromic layer 61 in FIG. 4) contains three types of photochromic materials that develop colors of cyan, magenta, and yellow, respectively, when irradiated with ultraviolet light from the lighting device (e.g., the lighting device 2 in FIG. 3), the information processing device (e.g., the mobile terminal 1 in FIG. 1) executes the following steps: and a color conversion control step of performing control to convert the predetermined medium (e.g., the crystal 42 of the watch 4 in FIGS. 1 and 3 ) into the predetermined color by irradiating the predetermined medium (e.g., the crystal 42 of the watch 4 in FIGS. 1 and 3 ) with ultraviolet light from the ultraviolet light source (e.g., the UV light source 55 in FIG. 3 ) of the lighting device (e.g., the lighting device 2 in FIG. 3 ) to cause it to develop a color, and then irradiating the predetermined medium (e.g., the crystal 42 of the watch 4 in FIGS. 1 and 3 ) with the red, green, and blue visible light from the red, green, and blue visible light sources (e.g., the LED light sources 56 a, 56 b, 56 c in FIG. 3 ) under conditions (irradiation intensity and irradiation time of each of the three visible light sources) required for converting the predetermined color.

[0181] DESCRIPTION OF SYMBOLS 1: Mobile terminal, 2: Lighting device, 11: CPU, 12: ROM, 13: RAM, 14: Bus, 15: Input / output interface, 16: Output unit, 17: Input unit, 18: Storage unit, 19: Communication unit, 20: Drive, 21: Removable media, 31: UI providing unit, 32: Color conversion control unit, 55: UV light source, 56a, 56b, 56c: LED light source

Claims

1. A color conversion system for converting the color of a predetermined medium, comprising: the predetermined medium having a photochromic layer; an illumination device for irradiating the predetermined medium with ultraviolet light from an ultraviolet light source and red, green, and blue visible light from red, green, and blue visible light sources, respectively; and an information processing device for controlling the irradiation by the illumination device, wherein the photochromic layer has three types of photochromic materials that develop colors of cyan, magenta, and yellow when irradiated with ultraviolet light from the illumination device, and the information processing device has color conversion control means for controlling the conversion of the predetermined medium to the predetermined color by irradiating the predetermined medium with ultraviolet light from the ultraviolet light source of the illumination device to develop a color, and irradiating the predetermined medium with the red, green, and blue visible light from the red, green, and blue visible light sources of the illumination device, respectively, under conditions required for conversion to the predetermined color, thereby fading the predetermined medium.

2. The color conversion system of claim 1, wherein the specified medium further has a coating layer that absorbs ultraviolet rays of wavelengths contained in sunlight at the earth's surface and transmits ultraviolet rays of a specified wavelength or less, and the ultraviolet rays irradiated from the irradiation device include at least a component of a coloring wavelength set to cause the specified medium to color within a range of the specified wavelength or less that is transmitted through the coating layer.

3. The color conversion system described in claim 2, wherein the coating layer includes a photocurable resin, an ultraviolet absorbing material, and a polymerization initiator, the ultraviolet absorbing material absorbs ultraviolet rays in a light absorption region that includes the wavelengths contained in sunlight on the Earth's surface, and the polymerization initiator absorbs the ultraviolet rays of the color-developing wavelength and has an absorption edge in a specified visible light region outside the light absorption region.

4. The color conversion system according to claim 1, wherein the photochromic layer includes an ultraviolet curing resin mixed with a photochromic material, and the ultraviolet curing resin has a difference in solubility parameter such that the ultraviolet curing resin and the photochromic material do not separate from each other before being irradiated with ultraviolet light from the ultraviolet light source of the lighting device.

5. The color conversion system according to claim 1, wherein the predetermined medium is a nail placed on a person's fingernail.

6. The color conversion system according to claim 1, wherein the predetermined medium is disposed in at least a portion of a watch.

7. A color conversion system for converting the color of a predetermined medium, comprising: the predetermined medium having a photochromic layer; an illumination device for irradiating the predetermined medium with ultraviolet light from an ultraviolet light source and the red, green, and blue visible light from red, green, and blue visible light sources, respectively; and an information processing device for controlling the irradiation of the illumination device, wherein the color conversion method is executed by the information processing device of the color conversion system, wherein, when the photochromic layer has three types of photochromic materials that develop colors of cyan, magenta, and yellow when irradiated with ultraviolet light from the illumination device, the information processing device executes steps including: a color conversion control step of irradiating the predetermined medium with ultraviolet light from the ultraviolet light source of the illumination device to cause the predetermined medium to develop a color, and irradiating the predetermined medium with the red, green, and blue visible light from the red, green, and blue visible light sources of the illumination device, respectively, under conditions necessary for converting the predetermined color, thereby fading the predetermined medium.

Images