Method for manufacturing a dial plate, dial plate, and clock

Abstract

To allow expression of various different designs using gloss in the dial face of a timepiece.SOLUTION: A method for manufacturing a dial face of a timepiece includes: attaching a first uncured resin coating of an ultraviolet cured type on one surface of a substrate; applying an ultraviolet ray to the first resin coating before the surface of the first resin coating attached becomes flat and curing the first resin coating; forming a rough surface print layer; attaching a second uncured resin coating of the ultraviolet cured type with translucency to cover the rough surface print layer; applying the ultraviolet ray to the second resin coating after the surface of the second resin coating attached becomes flat and curing the second resin coating; and forming a shiny surface print layer.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a dial, a dial, and a clock.

Background Art

[0002] Conventionally, in the printing of a clock dial, the decorativeness of the dial has been enhanced by laminating a plurality of printing layers made of paint. For example, Patent Document 1 describes a method of realizing a glossy print by placing a transparent ink having the same shape as the printing ink on the printing ink.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the printing of a clock dial, it is required to express more diverse designs using gloss.

[0005] The present invention has been made to solve the above problems, and an object thereof is to provide a method for manufacturing a dial, a dial, and a clock that enable the expression of diverse designs using gloss.

Means for Solving the Problems

[0006] The manufacturing method of the dial of the clock according to the present invention is to attach an uncured ultraviolet-curable first resin paint to one surface of a substrate, irradiate ultraviolet rays before the surface of the attached first resin paint is flattened to cure the first resin paint, form a matte printing layer, and attach a translucent uncured ultraviolet-curable second resin paint so as to cover the matte printing layer, and irradiate ultraviolet rays after the surface of the attached second resin paint is flattened to cure the second resin paint, thereby forming a glossy printing layer.

[0007] Further, in the manufacturing method according to the present invention, when attaching the second resin paint, it is preferable to attach the second resin paint so as to cover part or all of the matte printing layer.

[0008] Further, in the manufacturing method according to the present invention, when attaching the second resin paint, it is preferable to attach the second resin paint so as to cover 10% or more of the area of the matte printing layer.

[0009] Further, in the manufacturing method according to the present invention, when attaching the second resin paint, it is preferable to attach the second resin paint to a thickness such that the second resin paint is flattened, approximately 20 μm or more.

[0010] Further, in the manufacturing method according to the present invention, it is preferable to irradiate ultraviolet rays within 0.5 seconds after the first resin paint is attached to cure the first resin paint, and irradiate ultraviolet rays 0.5 seconds after the second resin paint is attached to cure the second resin paint.

[0011] Further, in the manufacturing method according to the present invention, it is preferable that the first resin paint is colored and transparent, and the second resin paint is colorless and transparent.

[0012] The dial according to the present invention is a dial of a clock, and includes a substrate formed in a flat plate shape, a first printing layer formed on one surface of the substrate with a first surface roughness by an ultraviolet curable resin, and a second printing layer formed with a second surface roughness smaller than the first surface roughness by an ultraviolet curable resin having translucency so as to cover the first printing layer.

[0013] The clock according to the present invention is characterized by including the dial according to the present invention and a solar cell member that generates electricity by incident light transmitted through the dial.

[0014] In the clock according to the present invention, it is preferable that the dial is provided such that the substrate faces the solar cell member.

[0015] In the clock according to the present invention, it is preferable that the dial is provided such that the matte printing layer faces the solar cell member.

Advantages of the Invention

[0016] The method for manufacturing a dial, the dial, and the clock according to the present invention enable the expression of various designs using gloss.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0018] Hereinafter, various embodiments of the present invention will be described with reference to the drawings. It should be noted that the technical scope of the present invention is not limited to these embodiments, but extends to the invention described in the claims and its equivalents.

[0019] (First Embodiment) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 7. FIG. 1 is a front view of the clock 1 according to the first embodiment, and FIG. 2 is a cross-sectional view of the clock 1. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1. In FIG. 2, the illustration of the structure that is visible from the back in the cross-section is omitted. The clock 1 includes an outer case 11, a windproof glass 12, a dial 13, a movement 14, an hour hand 141, a minute hand 142, a second hand 143, a crown 15, a solar cell 16, etc. Although not shown, the clock 1 has a secondary battery that supplies power to the movement 14 and a charging circuit for charging the secondary battery, etc.

[0020] The outer case 11 is a flat member that houses the dial 13, the movement 14, etc. The outer case 11 is formed from an annular bezel 111 provided on the front surface of the clock 1, a back cover 113 provided on the back surface, and a body 112 that joins the bezel 111 and the back cover 113.

[0021] The bezel 111 is adhered to the front part of the body 112 by an adhesive member 114. The body 112 is adhered to the back cover 113 by an adhesive member 115 at its rear part. In addition, an attachment part 118 for attaching a band is formed on the outer peripheral part of the body 112. Also, a crown hole through which the crown 15 is inserted is formed on the outer peripheral part of the body 112.

[0022] The bezel 111, the body 112, and the back cover 113 are formed of stainless steel. The bezel 111, the body 112, and the back cover 113 may be formed of other metals such as titanium or gold, or resin, etc.

[0023] The windshield glass 12 is attached to the front surface of the outer case 11 so as to be surrounded by the bezel 111. The windshield glass 12 is a transparent glass plate formed in a disc shape, and is formed of sapphire glass, mineral glass, or the like. The windshield glass 12 is adhered to the front portion of the body 112 by the adhesive member 124, and covers the dial 13, the hour hand 141, the minute hand 142, and the second hand 143, thereby protecting them while allowing them to be visible from the front.

[0024] The dial 13 is a flat member on which the time characters 131 indicated by the hour hand 141, the minute hand 142, and the second hand 143 are displayed on the front surface. The dial 13 is built into the outer case 11 so as to be parallel to the windshield glass 12. The dial 13 has a through hole 137 penetrating the front and back of the dial 13 at the center, and the rotation shafts of the hour hand 141, the minute hand 142, and the second hand 143 are inserted into the through hole 137. Also, an annular first bezel 116 is arranged so as to cover the outer peripheral portion of the front surface of the dial 13. A second bezel 117 is arranged so as to cover the outer peripheral portion of the first bezel 116 and the inner periphery of the body 112 of the outer case 11.

[0025] The dial 13 has a first printing area 132 and a second printing area 133. The first printing area 132 is an area printed with gloss, and the second printing area 133 is an area printed with suppressed gloss. The first printing area 132 and the second printing area 133 are provided so as to form a predetermined design. In the example shown in FIG. 1, the predetermined design is an annular design, but it is not limited to such an example and may be any design. Since the structure of the printing applied to the first printing area 132 and the second printing area 133 will be described later with reference to FIG. 3, the cross-sectional structure of the dial 13 is simplified in FIG. 2.

[0026] The hour hand 141, the minute hand 142, and the second hand 143 are provided on the front surface of the dial 13, and are driven by a movement 14 provided on the back side of the dial 13 to indicate the hour characters 131 displayed on the dial 13. The rotation axes of the hour hand 141, the minute hand 142, and the second hand 143 are respectively inserted into coaxial hour hand pipes 144, minute hand pipes 145, and second hand pipes 146 and connected to the movement 14. The hour hand 141, the minute hand 142, and the second hand 143 are driven by transmitting a rotational force from the movement 14 through the rotation axes. The movement 14 is a quartz movement that is driven by being powered from a secondary battery (not shown). In addition, in FIG. 2, illustration of each member constituting the movement 14 is omitted.

[0027] The faucet 15 is a rotatable shaft-like member that is inserted into a faucet hole provided in the body 112 of the outer case 11 and connected to the movement 14. The rotational force of the faucet 15 is transmitted to the hour hand 141, the minute hand 142, and the second hand 143 through the movement 14 for time adjustment, and rotates the hour hand 141, the minute hand 142, and the second hand 143.

[0028] The solar cell 16 is a member that charges a secondary battery by supplying power generated by the photovoltaic effect to the secondary battery (not shown) through a charging circuit (not shown). The solar cell 16 generates electricity by incident light that enters the clock 1 and passes through the dial 13. The solar cell 16 has a substantially flat plate shape and is provided behind the dial 13 so as to face the dial 13. The solar cell 16 is formed of amorphous silicon or polycrystalline silicon. Note that the solar cell 16 is an example of a solar cell member.

[0029] FIG. 3 is a schematic cross-sectional view of the dial 13. The dial 13 has a transparent substrate 134, a matte printing layer 135, and a glossy printing layer 136, and the transparent substrate 134 is provided so as to face the solar cell 16. For ease of viewing, in FIG. 3, each component is illustrated with appropriate scaling.

[0030] The transparent substrate 134 is a flat member having translucency. The transparent substrate 134 is a colorless and transparent member formed of a synthetic resin such as polycarbonate, sapphire glass, glass, or the like. The transparent substrate 134 may be formed to be colored and transparent. The transparent substrate 134 is formed, for example, to have a thickness of 350 μm.

[0031] The matte printing layer 135 is formed on one surface of the transparent substrate 134 with a colored and transparent ultraviolet-curable resin. For example, the matte printing layer 135 is formed with a first resin coating obtained by adding a pigment to a translucent acrylic-based ultraviolet-curable resin. The matte printing layer 135 is formed so as to cover the entire one surface of the transparent substrate 134. The matte printing layer 135 is formed to have a thickness of 5 μm to 50 μm.

[0032] The matte printing layer 135 is formed with irregularities on the surface (referring to the surface opposite to the side of the transparent substrate 134). In FIG. 3, the irregularities on the surface of the matte printing layer 135 are represented by semi-circles, but this is a schematic illustration, and the irregularities on the surface of the matte printing layer 135 may have any shape. Due to the irregularities on the surface, the matte printing layer 135 has a surface roughness of, for example, 30 nm to 50 nm. The surface roughness is the arithmetic mean roughness Sa defined in ISO 25178.

[0033] The glossy printing layer 136 is formed so as to cover a part of the matte printing layer 135. In the example shown in FIG. 3, the glossy printing layer 136 is formed so as to cover only the region of the matte printing layer 135 corresponding to the first printing region 132. The glossy printing layer 136 is formed with a translucent ultraviolet-curable resin, and is formed, for example, with a second resin coating which is a colorless and transparent acrylic-based ultraviolet-curable resin. The refractive index of the second resin coating is preferably a value close to the refractive index of the first resin coating. For example, the second resin coating is a colorless and transparent (that is, no pigment is added) resin coating of the same type as the first resin coating. The glossy printing layer 136 is formed to have a thickness of 20 μm to 50 μm.

[0034] Note that since the glossy printing layer 136 is not formed in the region corresponding to the second printing region 133 on the surface of the matte printing layer 135, voids 138 are formed in such a region.

[0035] The glossy printing layer 136 is formed with a smoother surface than the matte printing layer 135. The glossy printing layer 136 has a surface roughness smaller than that of the matte printing layer 135. For example, the glossy printing layer 136 has a surface roughness of 15 nm or less.

[0036] FIG. 4 is a flowchart showing an example of the flow of the method for manufacturing the dial plate 13.

[0037] First, in step S11, an uncured ultraviolet-curable first resin coating is adhered to one surface of the transparent substrate 134. The first resin coating is adhered to the transparent substrate 134, for example, by an inkjet printer injecting droplets of the first resin coating.

[0038] Subsequently, in step S12, before the surface of the adhered first resin coating is flattened, ultraviolet rays are irradiated to cure the first resin coating. Thereby, a matte printing layer 135 having irregularities on the surface is formed.

[0039] That is, before the droplets of the ultraviolet-curable resin coating are ejected by an inkjet printer and adhered to the printing target, each has a substantially spherical shape due to the surface tension of the droplets. Therefore, immediately after these droplets adhere to the printing target, a shape with irregularities on the surface is formed by the combination of a plurality of substantially spherical droplets. On the other hand, as time elapses after the droplets adhere, the surface is flattened by the surface tension of the combined droplets. By irradiating ultraviolet rays to cure the droplets before the surface is flattened after the droplets adhere to the transparent substrate 134, the matte printing layer 135 is formed with irregularities on the surface.

[0040] Curing before flattening means curing such that the surface roughness measured after curing is 30 nm or more. For example, in the case of using an acrylic resin paint as the resin paint, when the irradiation intensity of ultraviolet light is 2.0 W / cm, by irradiating ultraviolet light within 0.5 seconds after the resin paint is adhered, it is possible to cure the resin paint before the surface of the resin paint is flattened.

[0041] Subsequently, in step S13, an uncured ultraviolet-curable second resin paint having translucency is adhered so as to cover a part of the rough printing layer 135. The second resin paint is adhered, for example, by an inkjet printer that has previously stored data indicating the first printing area 132 ejecting droplets of the first resin paint onto the area corresponding to the first printing area 132 of the rough printing layer 135.

[0042] Subsequently, in step S14, after the surface of the adhered second resin paint is flattened, ultraviolet light is irradiated to cure the second resin paint. Thereby, a glossy printing layer 136 having a smooth surface is formed.

[0043] Curing after flattening means curing such that the surface roughness measured after curing is 15 nm or less. For example, in the case of using an acrylic resin paint as the resin paint, when the irradiation intensity of ultraviolet light is 2.0 W / cm, by irradiating ultraviolet light 0.5 seconds after the resin paint is adhered, it is possible to cure the resin paint after the surface of the resin paint is flattened.

[0044] The nameplate 13 manufactured in this way has a three-dimensional effect because the printing thickness of the surface of the glossy printing layer 136 is higher than the surface of the rough printing layer 135, and a deep design is expressed.

[0045] As described above, in the nameplate 13, the matte printing layer 135 is formed by irradiating ultraviolet rays to cure the surface of the first resin coating adhered to the transparent substrate 134 before the surface is flattened. Further, the glossy printing layer 136 is formed by irradiating ultraviolet rays to cure the surface of the second resin coating having translucency adhered so as to cover the matte printing layer 135 after the surface is flattened. Thereby, the nameplate 13 enables the expression of various designs using gloss.

[0046] That is, the matte printing layer 135 is formed with irregularities on the surface, and the glossy printing layer 136 is formed with a smooth surface. In the first printing area 132, since the smooth surface of the glossy printing layer 136 becomes the surface of the nameplate 13 (that is, the interface between the nameplate 13 and the air), the first printing area 132 has a glossy appearance as if it has been polished. On the other hand, in the second printing area 133, since the surface of the matte printing layer 135 having irregularities becomes the surface of the nameplate 13, the second printing area 133 has a dull appearance with suppressed gloss as if it has been matte-finished. By having the nameplate 13 with the first printing area 132 having gloss and the second printing area 133 with suppressed gloss, it is possible to express a design like stained glass.

[0047] Also, in the nameplate 13, a void portion 138 is formed when the glossy printing layer 136 covers only a part of the matte printing layer 135. Then, a part of the light incident on the nameplate 13 is reflected at the interface between the glossy printing layer 136 and the void portion 138. Thereby, the nameplate 13 emphasizes the boundary between the first printing area 132 and the second printing area 133 and enables the expression of a three-dimensional design. In particular, when the glossy printing layer 136 has a thickness of 20 μm or more, a three-dimensional design with sufficient depth is expressed.

[0048] In addition, the front panel 13 enables an increase in the power generation amount of the solar cell 16 by forming the surface of the glossy printing layer 136 smoothly. That is, when the front panel 13 does not have the glossy printing layer 136, the light incident on the front panel 13 is diffusely reflected and attenuated due to the unevenness of the surface of the matte printing layer 135. On the other hand, when the front panel 13 has the glossy printing layer 136, since the unevenness of the surface of the glossy printing layer 136 is small, the attenuation of light due to diffuse reflection is suppressed. Therefore, by the front panel 13 having the glossy printing layer 136, the intensity of the light reaching the solar cell 16 increases, and the power generation amount of the solar cell 16 increases.

[0049] FIG. 5 is a diagram showing the measurement results of the surface roughness of the matte printing layer 135 and the glossy printing layer 136 by a white light interference microscope. FIG. 5(a) shows the surface height of the matte printing layer 135 along two measurement directions parallel to and perpendicular to each other on the surface of the matte printing layer 135. FIG. 5(b) shows the surface height of the glossy printing layer 136 along two measurement directions parallel to and perpendicular to each other on the surface of the glossy printing layer 136. The vertical axis in FIGS. 5(a) and 5(b) is the surface height (μm), and the horizontal axis is the displacement (mm) along the measurement direction. As shown in FIG. 5, when comparing the matte printing layer 135 and the glossy printing layer 136, the matte printing layer 135 has unevenness on the surface, and the glossy printing layer 136 has a smooth surface. In the measurement results of FIG. 5, the surface roughness of the matte printing layer 135 was approximately 30 nm to 50 nm, and the surface roughness of the glossy printing layer 136 was approximately 4 nm to 15 nm.

[0050] Since the amount of transmittance attenuation due to light scattering increases with an increase in surface roughness, it is necessary to create a state with a low surface roughness in order to obtain a high transmittance. In addition, the amount of transmittance attenuation depends on the wavelength, and the attenuation amount increases as the wavelength becomes shorter. In particular, when the solar cell 16 is amorphous silicon, since the wavelength that most contributes to power generation is a short wavelength of 400 nm to 550 nm, an increase in surface roughness is greatly involved in a decrease in the power generation amount.

[0051] FIG. 6 is a diagram showing the transmittance characteristics of the dial 13 measured for each of the cases where the dial 13 has and does not have the glossy printed layer 136. Note that the transmittance in FIG. 6 indicates the intensity ratio of the light transmitted through the dial 13 to the incident light incident on the clock 1. FIGS. 6(a) to 6(c) each show the light transmittance characteristics when the matte printed layer 135 is formed using cyan, magenta, and yellow colored transparent first resin paints. The horizontal axis in each figure is the wavelength (nm), and the vertical axis is the transmittance (%). Also, the dashed line in each figure indicates the transmittance characteristics when the glossy printed layer 136 is present, and the solid line indicates the transmittance characteristics when the glossy printed layer 136 is absent. In the measurement shown in FIG. 5, the thickness of the glossy printed layer 136 was 20 μm to 30 μm, and the glossy printed layer 136 was formed so as to cover the entire matte printed layer 135.

[0052] As shown in FIGS. 6(a) to 6(c), regardless of the color of the first resin paint, a higher transmittance was measured in the wavelength band of 400 nm to 700 nm when the glossy printed layer 136 was present than when it was absent. Also, the difference in transmittance between the case where the glossy printed layer 136 was present and the case where it was absent was about 25% at most.

[0053] Also, the applicant measured the power generation amount of the solar cell 16 for each of the cases where the dial 13 had and did not have the glossy printed layer 136. As a result, an increase in the power generation amount of 0.49 to 0.6% was confirmed when the glossy printed layer 136 was printed compared to the case where only the matte printed layer 135 was printed. Also, the applicant created a plurality of dials 13 with different printed areas of the glossy printed layer 136 after forming the blue matte printed layer 135 and measured the power generation amount of each. As a result, it was confirmed that the power generation amount increased as the area ratio of the glossy printed layer 136 to the matte printed layer 135 increased, and the power generation amount increased by 0.1% or more when the area ratio was 10% or more. Therefore, when it is desired to increase the power generation amount, it is preferable that the second resin paint is adhered so as to cover 10% or more of the area of the matte printed layer 135 in step S13 of the method for manufacturing the dial 13.

[0054] In the above description, it is assumed that the matte printing layer 135 and the glossy printing layer 136 are each formed once in the manufacturing method of FIG. 4, but it is not limited to such an example. For example, in the manufacturing method of FIG. 4, steps S11 and S12 may be further executed after step S12, and a plurality of matte printing layers 135 may be formed by overlapping. Thereby, the matte printing layer 135 becomes thicker, and the depth of the color of the first resin paint is more strongly expressed. Also, in the manufacturing method of FIG. 4, steps S13 and S14 may be further executed after step S14, and a plurality of glossy printing layers 136 may be formed by overlapping. Thereby, the glossy printing layer 136 becomes thicker, and the three-dimensional effect is more strongly expressed.

[0055] Further, the nameplate 13a may have a plurality of matte printing layers 135 and glossy printing layers 136 laminated alternately. FIG. 7 is a schematic cross-sectional view of the nameplate 13 having a plurality of matte printing layers 135 and glossy printing layers 136.

[0056] In the example shown in FIG. 7, a first matte printing layer 135-1 is formed on one surface of the transparent substrate 134, and a first glossy printing layer 136-1 is formed so as to cover a part of the first matte printing layer 135-1. Also, a second matte printing layer 135-2 is formed so as to cover the first glossy printing layer 136-1, and a second glossy printing layer 136-2 is formed so as to cover a part of the second matte printing layer 135-2. By having a plurality of matte printing layers 135 or glossy printing layers 136 in this way, the nameplate 13 can more strongly express the depth of color and the three-dimensional effect.

[0057] In addition, as long as the matte printing layer 136 is formed so as to cover at least one rough printing layer 135, the number and order of the printing layers are not limited to the example shown in FIG. 7. For example, in the example shown in FIG. 7, either the first matte printing layer 136-1 or the second matte printing layer 136-2 may not be formed. Further, in the example shown in FIG. 7, three or more rough printing layers 135 or matte printing layers 136 may be formed. Further, when the dial 13 has a plurality of rough printing layers 135, the plurality of rough printing layers 135 may be formed of resin paints of different colors or may be formed of resin paints of the same color.

[0058] In the above description, the dial 13 is provided such that the transparent substrate 134 faces the solar cell 16, but the present invention is not limited to such an example. The dial 13 may be provided such that the matte printing layer 136 faces the solar cell 16 (that is, upside down from the state shown in FIG. 3). Thereby, since the boundary between the first printing area 132 and the second printing area 133 is visually recognized behind the transparent substrate 134, a design with depth is expressed.

[0059] In the above description, in the dial 13, the matte printing layer 136 covers a part of the rough printing layer 135, but the matte printing layer 136 may cover the entire rough printing layer 135. That is, the dial 13 may not have the second printing area 133. Thereby, the dial 13 can increase the power generation amount of the solar cell 16 while expressing gloss on the entire surface.

[0060] In the above description, the movement 14 of the clock 1 is a quartz movement powered by a secondary battery, but the present invention is not limited to such an example. The movement 14 may be a mechanical movement or a quartz movement powered by a dry battery or the like other than a secondary battery. In this case, the clock 1 does not have the solar cell 16, and the rough printing layer 135 may be an opaque member. Further, an opaque substrate may be used instead of the transparent substrate 134.

[0061] (Second Embodiment) Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. 8 to 10. Since the second embodiment is different from the first embodiment in the structure of the dial plate, only the structure of the dial plate will be described below. In addition, the same components as those in the already described embodiments are denoted by the same reference numerals, and the description thereof will be omitted.

[0062] FIG. 8 is a front view of the dial plate 13a according to the second embodiment. Similar to the dial plate 13 according to the first embodiment, the hour character 131 is displayed on the front surface of the dial plate 13a, and a through hole 137 that penetrates the front and back of the dial plate 13 is provided at the center. The dial plate 13a has a first printing area 132a and a second printing area 133a on the surface. The first printing area 132a and the second printing area 133a are areas where printing of different colors is performed. For example, the first printing area 132a is colorless and transparent, and the second printing area 133a is colored and transparent. The second printing area 133a is formed so as to represent a predetermined design. In the example shown in FIG. 8, the predetermined design is an annular design, but it is not limited to such an example and may be any design.

[0063] FIG. 9 is a schematic cross-sectional view of the dial plate 13a. The dial plate 13a has a transparent substrate 134, a matte printing layer 135a, and a glossy printing layer 136a, and the glossy printing layer 136a is provided so as to face the solar cell 16.

[0064] The matte printing layer 135a is formed on one surface of the transparent substrate 134 with a colored transparent ultraviolet curable resin. In the example shown in FIG. 9, the matte printing layer 135a is formed so as to cover only the area of the transparent substrate 134 corresponding to the second printing area 133a. The matte printing layer 135a is formed to have a thickness of 10 μm to 50 μm. The matte printing layer 135a is formed with irregularities on the surface. The irregularities on the surface have a surface roughness of, for example, 20 nm to 50 nm.

[0065] The glossy printed layer 136a is formed of a light-transmitting ultraviolet-curing resin so as to cover the matte printed layer 135a. In the example shown in FIG. 9, the glossy printed layer 136a is formed across both the first printing area 132a and the second printing area 133a so as to cover the transparent substrate 134 and the matte printed layer 135a. The glossy printed layer 136a is formed to have a thickness of 20 μm to 50 μm. The glossy printed layer 136a is formed, for example, to be colorless and transparent. The refractive index of the resin forming the glossy printed layer 136a is preferably a value close to the refractive index of the resin forming the matte printed layer 135a. The surface of the glossy printed layer 136a is formed smoother than the matte printed layer 135a. For example, the glossy printed layer 136a has a surface roughness of 15 nm or less.

[0066] FIG. 10 is a flowchart showing an example of the flow of the method for manufacturing the dial plate 13a.

[0067] First, in step S21, a colored transparent uncured ultraviolet-curing first resin coating material is attached to a part of one surface of the transparent substrate 134. The first resin coating material is attached to the area corresponding to the second printing area 133a of the transparent substrate 134. The first resin coating material is attached, for example, by an inkjet printer that has previously stored data indicating the second printing area 133a ejecting droplets of the first resin coating material onto the area corresponding to the second printing area 133a of the transparent substrate 134.

[0068] Subsequently, in step S22, before the surface of the attached first resin coating material is flattened, ultraviolet rays are irradiated to cure the first resin coating material. Thereby, a matte printed layer 135a having irregularities on the surface is formed.

[0069] Subsequently, in step S23, a light-transmitting uncured ultraviolet-curing second resin coating material is attached so as to cover the matte printed layer 135a. The second resin coating material is attached, for example, by an inkjet printer ejecting droplets of the second resin coating material onto the transparent substrate 134 and the matte printed layer 135a.

[0070] Subsequently, in step S24, after the surface of the applied second resin coating is flattened, ultraviolet rays are irradiated to cure the second resin coating. As a result, a glossy printed layer 136a with a smooth surface is formed.

[0071] The nameplate 13a manufactured in this way is provided in the clock 1 such that the glossy printed layer 136a faces the solar cell 16.

[0072] As described above, in the nameplate 13a, the matte printed layer 135a is formed by irradiating ultraviolet rays to cure the surface of the first resin coating adhered to the region corresponding to the second printing region 133a of the transparent substrate 134 before the surface is flattened. The glossy printed layer 136a is formed by irradiating ultraviolet rays to cure the surface of the second resin coating having translucency, which is adhered so as to cover the matte printed layer 135a, after the surface is flattened. Thereby, the nameplate 13a can express a delicate design while having gloss.

[0073] That is, as described above, as time passes after the droplets of the resin coating adhere to the printing target, the surface of the droplets is flattened, and a glossy print can be obtained. On the other hand, as time passes after the droplets adhere, the droplets spread on the printing target, and the boundary of the printing region may become unclear or a delicate design may not be able to be expressed. Therefore, conventionally, it has been difficult to express a delicate design while having gloss using ultraviolet-curable resin droplets. The nameplate 13a can express a delicate design with the matte printed layer 135a and give gloss to the print with the glossy printed layer 136a, thereby making it possible to express a delicate design while having gloss.

[0074] Similar to the first embodiment, the clock 1 may not have the solar cell 16.

[0075] In the above description, the nameplate 13a is provided such that the glossy printed layer 136a faces the solar cell 16. However, similar to the first embodiment, the transparent substrate 134 may be provided so as to face the solar cell 16.

[0076] It should be understood by those skilled in the art that various changes, substitutions, and modifications can be made to this without departing from the spirit and scope of the present invention. For example, the processing of each part described above may be executed in a different order as appropriate within the scope of the present invention. Also, the above-described embodiments and variations may be implemented in combination as appropriate within the scope of the present invention.

Explanation of Reference Numerals

[0077] 1 Clock 11 Outer case 12 Windshield 13 Dial 134 Transparent substrate 135 Matte printing layer 136 Glossy printing layer

Claims

1. an inkjet printer ejects droplets of an uncured ultraviolet-curable first resin coating material onto one side of a substrate; Before the unevenness on the surface of the first resin paint formed by the combination of droplets of the first resin paint is flattened, the first resin paint is cured by irradiating with ultraviolet light to form a rough surface printing layer; A second resin coating material of an uncured ultraviolet-curable type having light-transmitting properties is applied so as to cover the rough-surface printing layer; After the surface of the applied second resin coating material is flattened, the second resin coating material is cured by irradiating it with ultraviolet light to form a glossy printed layer; In the step of applying the second resin coating material, a portion of the rough-surface printing layer is coated to form a gap portion, which is an area where the glossy printing layer does not coat the rough-surface printing layer. A method for manufacturing a timepiece dial.

2. In the step of applying the second resin coating material, the second resin coating material is applied so as to cover 10% or more of the area of ​​the rough surface printing layer. The method of claim 1 .

3. within 0.5 seconds after the first resin coating is applied, ultraviolet light is irradiated to harden the first resin coating; 0.5 seconds after the second resin coating material is applied, the second resin coating material is cured by irradiating the material with ultraviolet light. The method according to claim 1 or 2.

4. The first resin paint is colored and transparent, The second resin paint is colorless and transparent. The method of any one of claims 1 to 3.

5. A clock face, A substrate formed in a flat plate shape; a rough surface printing layer formed on one surface of the substrate by ultraviolet curing resin and having a first surface roughness; a glossy surface printed layer formed of a light-transmitting ultraviolet-curable resin so as to cover the rough surface printed layer and having a second surface roughness smaller than the first surface roughness; having The glossy surface printing layer includes a gap portion which is an area where the rough surface printing layer is not coated. A dial characterized by

6. The dial according to claim 5 ; a solar cell member that generates electricity using incident light that has passed through the dial; A watch comprising:

7. The dial is provided such that the substrate faces the solar cell member.

7. The watch according to claim 6.

8. The dial is provided so that the glossy surface print layer faces the solar cell member.

7. The watch according to claim 6.

9. The glossy surface printing layer is A first glossy surface printed layer formed so as to cover a portion of the rough surface printed layer; A second glossy surface printed layer is formed so as to be spaced apart from the first glossy surface printed layer and cover a portion of the rough surface printed layer, The gap is formed between the first glossy surface printed layer and the second glossy surface printed layer.

6. The dial according to claim 5.

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