JP2008164552A - Timepiece dial, manufacturing method for the timepiece dial, and timepiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a timepiece dial superior in Japanese lacquer (Urushi) texture, a color tone and decorativeness (appearance beauty), and superior in light transmissivity, and to provide a timepiece capable of supplying ample light quantity of outdoor daylight to a solar cell, and is superior in Japanese lacquer texture, color tone and decorativeness. <P>SOLUTION: This timepiece dial 1 has a base material 12, constituted of a light transmissive material, a high refractive index material film 13 having a refractive index higher than that of a material constituting the base material 12, and having light transmissive properties, and a Japanese lacquer film 14 provided in a face side opposite to a face opposed to the base material 12 in the high refractive index material film 13, and constituted mainly of Japanese lacquer. An opening part 142 is provided in the Japanese lacquer film 14, and relation 0.1≤n<SB>3</SB>-n<SB>2</SB>≤1.34 is satisfied, where n<SB>3</SB>is the absolute refractive index of a material, constituting the high refractive index material film 13, and n<SB>2</SB>is the absolute refractive index of a material constituting the base material 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a timepiece dial, a method for manufacturing a timepiece dial, and a timepiece.

The timepiece dial is required to have a function as a practical product and a decorative property (aesthetic appearance) as a decorative product. In particular, in solar timepieces equipped with solar cells, when solar cells (solar cells) are placed under the dial (solar watch dial), the dial has excellent light transmissivity and other decorative items. Decorative properties (aesthetic appearance) are required.
Specifically, the dial for a solar timepiece provides a sufficient amount of light for driving the timepiece through a solar cell disposed below the solar dial, while providing a decorative item. Decorative properties are also required.

  Lacquer is a paint collected from natural trees and is used for decoration such as high-quality tableware and furniture. Lacquer has a unique texture and color, and an article obtained by applying lacquer is superior in luxury and aesthetic appearance. When this lacquer is applied to a watch dial, the watch dial has a disadvantage that it cannot be suitably applied to a solar watch or the like because the watch dial has low light transmittance, although a high-quality feeling can be obtained. . Moreover, in order to solve this, when lacquer was applied thinly, there was a problem that it was difficult to obtain the unique texture and color tone of lacquer.

  Moreover, as a dial plate for a solar watch with a metallic tone, a dial plate for a watch in which a metal film having an opening is attached on a light-transmitting base material is disclosed (for example, Patent Document 1). However, such a timepiece dial has a problem in that the gloss inherent in the metal cannot be exhibited sufficiently. In addition, when using lacquer as a watch dial, even if a lacquer coating with openings is provided on a light-transmitting substrate, the original luster, texture and color tone of lacquer are obtained. There was a problem that could not be.

JP 11-326549 A

  The object of the present invention is excellent in lacquer texture, color tone and decorativeness (aesthetic appearance), and is excellent in light transmission and watch dial, and lacquer texture, color tone and decorativeness (aesthetic appearance), In addition, a method for producing a timepiece dial that can efficiently produce a timepiece dial having excellent light transmittance by a simple method, and supplying a sufficient amount of external light to a solar cell is provided. The object of the present invention is to provide a watch that is excellent in decorativeness and lacquer texture and color.

Such an object is achieved by the present invention described below.
The timepiece dial of the present invention includes a base material made of a light-transmitting material,
A high-refractive-index material film made of a material having a refractive index higher than that of the material constituting the base material and having light transmittance;
Provided on the surface side opposite to the surface facing the base material of the high refractive index material film, and having a lacquer film mainly composed of lacquer,
The lacquer film is provided with an opening,
When the absolute refractive index of the material constituting the high refractive index material film is n ₃ and the absolute refractive index of the material constituting the base material is n ₂ , 0.1 ≦ n ₃ −n ₂ ≦ 1.34 It is characterized by satisfying the relationship.
Thereby, it is possible to provide a timepiece dial having excellent lacquer texture, color tone, decorativeness (aesthetic appearance), and light transmittance.

In the timepiece dial of the present invention, it is preferable that the lacquer contains urushiol.
As a result, it is possible to provide a timepiece dial having a particularly excellent lacquer texture and color tone and a particularly aesthetic appearance.
In the timepiece dial of the present invention, it is preferable that the lacquer film contains Fe.
As a result, the lacquer can exhibit a particularly dark black color, and the unique color tone and texture appear more prominently. For this reason, it is possible to provide a timepiece dial having a particularly excellent lacquer texture and color tone and an especially aesthetic appearance.

In the timepiece dial of the present invention, the area ratio occupied by the opening when the lacquer film is viewed in plan is preferably 10 to 40%.
As a result, it is possible to provide a timepiece dial having a particularly excellent aesthetic appearance (aesthetics), while making the light transmittance sufficiently high.
In the timepiece dial of the present invention, the high refractive index material film is preferably a material selected from TiO ₂ , ZnS, Nb ₂ O ₅ , Ti ₃ O ₅ , ZrO ₂ , and WO ₃ .
Thereby, it is possible to provide a timepiece dial having particularly excellent aesthetic appearance (aesthetics) while making the light transmittance particularly high.

In the timepiece dial of the present invention, the _{n 3} is preferably 1.7 to 2.9.
Thereby, it is possible to provide a timepiece dial having particularly excellent aesthetic appearance.
In the timepiece dial of the present invention, it is preferable that an average thickness of the high refractive index material film is 0.005 to 0.3 μm.
As a result, it is possible to provide a timepiece dial having a particularly excellent aesthetic appearance (aesthetics), while making the light transmittance sufficiently high.

In the timepiece dial of the present invention, the n ₂ is preferably 1.2 to 1.6.
Thereby, it is possible to provide a timepiece dial having particularly excellent aesthetic appearance.
In the timepiece dial of the present invention, the base material is composed of a material containing at least one selected from polycarbonate, acrylonitrile-butadiene-styrene copolymer, soda glass, and quartz glass. preferable.
As a result, it is possible to provide a timepiece dial having a particularly excellent aesthetic appearance (aesthetics), while making the light transmittance sufficiently high.

A method for manufacturing a timepiece dial of the present invention includes a high refractive index material film forming step of forming a high refractive index material film on a base material made of a light transmissive material,
Lacquer that lacquer paint containing lacquer is intermittently ejected as droplets from the head by vibration of the piezoelectric element, and the droplets land on the high refractive index material film in a predetermined pattern to form a lacquer film A film forming step,
When the absolute refractive index of the material constituting the high refractive index material film is n ₃ and the absolute refractive index of the material constituting the base material is n ₂ , 0.1 ≦ n ₃ −n ₂ ≦ 1.34 It is characterized by satisfying the relationship.
Thus, a timepiece dial manufacturing method capable of efficiently and efficiently manufacturing a timepiece dial having excellent lacquer texture, color tone, decorativeness (aesthetic appearance) and excellent light transmittance. Can be provided.
The timepiece of the present invention has the timepiece dial of the present invention and a solar cell,
The timepiece dial is arranged on the light receiving surface side of the solar cell.
Thereby, a sufficient amount of external light can be supplied to the solar cell, and a watch having excellent lacquer texture and color tone and excellent decorativeness can be provided.

  According to the present invention, a watch dial having excellent lacquer texture, color tone and decorativeness (aesthetic appearance) and light transmittance, and lacquer texture, color tone and decorativeness (aesthetic appearance), In addition, a method for producing a timepiece dial that can efficiently produce a timepiece dial having excellent light transmittance by a simple method, and supplying a sufficient amount of external light to a solar cell is provided. It is possible to provide a watch that is excellent in lacquer texture, color tone and decorativeness.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.
<Watch dial>
First, a preferred embodiment of the timepiece dial of the present invention will be described.
FIG. 1 is a cross-sectional view showing a preferred embodiment of the timepiece dial of the present invention.
As shown in FIG. 1, the timepiece dial 1 of the present embodiment has a base material 12 made of a light-transmitting material, a higher refractive index than the material constituting the base material 12, and A high-refractive-index material film 13 made of a light-transmitting material, and a lacquer film 14 made of lacquer, which is provided on the side of the high-refractive-index material film 13 opposite to the surface facing the substrate 12. And have. And the lacquer film 14 is provided with the real part 141 mainly comprised with the lacquer, and the opening part 142 so that it may explain in full detail behind. Such a timepiece dial 1 is not particularly limited, but normally, the surface side of the base material 12 covered with the high refractive index material film 13 and the lacquer film 14 is the outer surface side, that is, the observer side. It is used. In the following description, when viewed as the timepiece dial 1 as a whole, the light incident side will be described as a first surface, and the side opposite to the first surface will be described as a second surface. Further, unless otherwise specified, the refractive index in the present invention refers to an absolute refractive index measured using a Na-D lamp (light source wavelength: 589.3 nm) at a measurement temperature of 20 ° C.

[Base material]
The base material 12 is comprised with the material which has a light transmittance. In the present invention, a timepiece dial that can suitably transmit light incident from the outer surface side can be provided by using the light-transmitting substrate 12.
Refractive index _{n 2} of the material of the substrate 12 is preferably 1.2 to 1.6, more preferably from 1.25 to 1.59, is 1.3 to 1.58 Is more preferable. Thereby, incident light can be suitably reflected and transmitted at the interface between the base material 12 and the high refractive index material film 13 described in detail later. Thereby, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent while the light transmittance is sufficiently high.

  Examples of the light transmissive material include polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS resin), polymethyl methacrylate (PMMA), polyethylene (PE), polypropylene (PP), and the like. Main plastic materials such as copolymers, blends and polymer alloys, and various glass materials such as soda glass, crystalline glass, quartz glass, lead glass, potassium glass, borosilicate glass and alkali-free glass It is done. Among these, the substrate 12 is preferably polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS resin), soda glass, or quartz glass. Thereby, while making the aesthetic appearance of the timepiece dial 1 sufficiently excellent, the light transmission property can be made particularly excellent.

  When the base material 12 is made of a material containing at least one selected from polycarbonate (PC) and acrylonitrile-butadiene-styrene copolymer (ABS resin), the strength of the timepiece dial 1 as a whole is increased. It can be made particularly excellent. In addition, when the timepiece dial 1 is manufactured, since the degree of freedom in forming the base material 12 is increased (easiness of forming is improved), even if the timepiece dial 1 has a more complicated shape, It can be manufactured easily and reliably. Polycarbonate is relatively inexpensive among various plastic materials, and can contribute to further reduction in production cost of the timepiece dial 1. The ABS resin also has particularly excellent chemical resistance, and can further improve the durability of the timepiece dial 1 as a whole.

  Soda glass and quartz glass, which are glass materials, are superior in chemical stability to plastic materials. Therefore, if the base material 12 is made of the glass material as described above, even if the timepiece dial 1 is exposed to light for a long period of time, the deformation or alteration of the base material 12 Quality degradation can be suppressed. Further, the thermal expansion coefficient of the glass material is smaller than that of the plastic material. Therefore, it is possible to prevent a peeling failure such that the base material 12 and the high refractive index material film 13 provided on the surface of the base material 12 are peeled off due to fluctuations in the outside air temperature. Therefore, the high aesthetic appearance of the timepiece dial 1 can be maintained over a long period of time when the base material 12 is made of the above glass material.

In addition, the base material 12 may contain components other than the material mentioned above. Examples of such components include plasticizers, antioxidants, colorants (including various color formers, fluorescent substances, phosphorescent substances, etc.), brighteners, fillers, and the like.
Moreover, the base material 12 may contain said plastic material and glass material. For example, the base material 12 may have a configuration in which a sheet made of a glass material and a sheet made of a plastic material are laminated, and the material constituting the base material 12 is a glass material. It may be a composite material in which the filler composed of is mixed with a plastic material.

Moreover, the base material 12 may have a base and a surface layer provided on the base. In the case where the substrate 12 has such a configuration, it is sufficient that at least the vicinity of the surface (a portion adjacent to a high refractive index material film 13 described later) is made of the material described above.
The shape and size of the base material 12 are not particularly limited, and are usually determined based on the shape and size of the timepiece dial 1.
The substrate 12 may be formed by any method. Examples of the method for forming the substrate 12 include compression molding, extrusion molding, injection molding, and stamping (press molding). .

[High refractive index material film]
On the surface of the base material 12, a high refractive index material film 13 made of a material having a refractive index higher than that of the material constituting the base material 12 and having light transmittance is provided. Thus, the high refractive index material film 13 is interposed between the base material 12 and the lacquer film 14 without directly providing the lacquer film 14 having the real part 141 and the opening 142 on the surface of the base material 12. is doing. By providing the above-described configuration, the timepiece dial 1 can efficiently use the light incident on the opening 142, has an excellent lacquer texture and color tone, and can have an excellent aesthetic appearance. At the same time, the light transmittance can be improved.

More detailed description is as follows.
In (2a) in FIG. 2, the base material 12 is provided with a high refractive index material film 13 and a lacquer film 14 on the surface of the high refractive index material film 13 opposite to the surface facing the base material 12. The watch dial 1 of the present embodiment, that is, the present embodiment is shown. On the other hand, (2b) shows the timepiece dial 2 provided with a lacquer film 24 having an opening 242 on the surface of the base material 22. Both (2a) and (2b) are schematic views of a state in which light is incident on the opening from the outer surface side, as viewed from the cross-sectional direction. In addition, in the center of the figure, (2a) shows the perpendicular of the interface between the substrate 12 and the high refractive index material film 13, and (2b) shows the perpendicular of the interface between the substrate 22 and the lacquer film 24, Here, description will be made assuming that incident light is incident from the upper left side in the figure. The material of each component is the same as the material of each component of the timepiece dial 1 shown in FIG.

In the timepiece dial 1 provided with the high refractive index material film 13, the light incident on the timepiece dial 1 from the first surface side is absorbed by the real part 141 of the lacquer film 14 provided on the outer surface side. On the other hand, a part of the incident light enters the high refractive index material film 13 through the opening 142. Light incident on the high refractive index material film 13 from the first surface side has an angle θ (θ _c ≦ θ <90 °) equal to or greater than θ _c with a predetermined angle θ _c (critical angle) as a boundary from the illustrated perpendicular line. ) At the interface between the base material 12 and the high refractive index material film 13, it is totally reflected toward the outer surface side (first surface side). This phenomenon is observed when light that passes through adjacent materials having different refractive indexes and that has a high refractive index tries to enter a material having a low refractive index. Thus, the presence of the light totally reflected in the high refractive index material film 13 allows the lacquer film 14 to be visually recognized as having an excellent gloss (gloss), and emphasizes the texture and color tone of the lacquer. can do. For this reason, the timepiece dial 1 is excellent in aesthetic appearance. On the other hand, light from the first surface incident at an angle θ (0 ° ≦ θ <θ _c ) less than θ _c can be emitted to the second surface. Therefore, it is possible to provide a timepiece dial 1 that sufficiently achieves both excellent light transmittance and excellent decorativeness (aesthetic appearance).

  In general, the solar cell has a property that the power generation efficiency decreases rapidly as the angle formed between the normal line of the main surface of the solar cell and the incident angle increases. That is, it is difficult to effectively use light incident on the solar cell from an oblique direction for power generation. Therefore, in the present invention, it is possible to improve the aesthetic appearance by totally reflecting light from an oblique direction (light incident at an angle greater than the critical angle) that is difficult to effectively use for power generation. it can. Therefore, by using the timepiece dial of the present invention as a solar timepiece dial, the aesthetic appearance can be dramatically improved without substantially reducing the power generation efficiency.

  On the other hand, in the timepiece dial 2 having no high refractive index material film, most of the light incident from the first surface side is refracted at the interface between the base material 22 and the lacquer film 24, Since the light is emitted to the surface side of 2, the light is hardly reflected to the outer surface side. For this reason, when the aperture ratio of the lacquer film 24 is large, the lacquer film 24 cannot be visually recognized as having an excellent gloss (gloss), and it is difficult to make the lacquer texture and color tone excellent. Become. On the other hand, when the area ratio of the opening 242 is made low and the area ratio of the real part is made high, the texture and color tone of the lacquer can be made excellent, but light transmission as a whole of the timepiece dial 2 is achieved. The rate cannot be high enough. In other words, the timepiece dial 2 having such a configuration cannot simultaneously achieve excellent light transmission and aesthetic appearance.

The refractive index n ₃ of the material constituting the high refractive index material film 13 is preferably 1.7 to 2.9, more preferably 1.8 to 2.85, and 1.9 to 2. More preferably, it is 8. Thereby, incident light can be suitably reflected and transmitted at the interface between the high refractive index material film 13 and the substrate 12 described above. Thereby, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent while the light transmittance is sufficiently high.
Further, the value of n ₃ −n ₂ , which is the difference in refractive index between the material constituting the high refractive index material film 13 and the material constituting the substrate 12, is 0.1 ≦ n ₃ −n ₂ ≦ 1.34. Satisfied with the relationship. Note that the critical angle (theta _c) is, _{n 3,} and determined from the value of _{n 2,} generally, the difference in refractive index between the high refractive index material film 13 and the substrate 12 _(n 3 _-n 2) Increases, the critical angle (θ _c ) decreases (increased the range of incident angles at which incident light is totally reflected). Conversely, when the difference in refractive index between the high refractive index material film 13 and the substrate 12 decreases. , The critical angle (θ _c ) increases (the range of incident angles through which incident light passes through the interface is expanded). The timepiece dial 1 including the high refractive index material film 13 and the base material 12 in which the value of n ₃ -n ₂ satisfies the above relationship is the interface between the high refractive index material film 13 and the base material 12. Reflection and transmission of light occur suitably, and it is possible to achieve both excellent decorativeness (aesthetic appearance) and excellent light transmittance. On the other hand, when the value of n ₃ −n ₂ is less than the lower limit of the above range, the critical angle (θ _c ) becomes too large, and most of the light incident on the timepiece dial 1 is second. The reflection at the interface between the high refractive index material film and the substrate is difficult to occur. For this reason, the texture and color tone of the lacquer in the lacquer film 14 cannot be made sufficiently excellent, and the aesthetic appearance of the timepiece dial cannot be made excellent. On the other hand, when the value of n ₃ -n ₂ is larger than the upper limit of the above range, the critical angle (θ _c ) becomes too small, and among the light incident on the timepiece dial 1, the high refractive index material film and At the interface with the base material, the component of the light reflected toward the outer surface increases, and the opening 142 and the real part 141 of the lacquer film 14 can be visually recognized. As a result, the texture and color tone of the lacquer are excellent. Can not. Further, the light transmittance cannot be made sufficiently high. That is, when the value of n ₃ −n ₂ is out of the above range, it is impossible to achieve both excellent aesthetic appearance and excellent light transmittance.

In such a timepiece dial plate 1, as described above, the relationship 0.1 ≦ n ₃ −n ₂ ≦ 1.34 is satisfied, but the relationship 0.2 ≦ n ₃ −n ₂ ≦ 1.30 is satisfied. Is more preferable, and it is further preferable that the relationship of 0.3 ≦ n ₃ −n ₂ ≦ 1.25 is satisfied. Thereby, since reflection and transmission at the interface between the high refractive index material film 13 and the base material 12 are particularly suitable, a timepiece dial having a particularly excellent aesthetic appearance while making the light transmission sufficiently high. 1 can be provided.

The material constituting the high-refractive index material film 13 may be any material as long as the value of n ₃ −n ₂ satisfies the above-described relationship. For example, various metal oxides and sulfides, plastic materials, and the like are used. Preferably Fe, Cu, Zn, Ni, Mg, Cr, Mn, Mo, Nb, Al, V, Zr, Sn, Au, Hf, Pd, Pt, Ag, Co, In, W, Examples thereof include oxides of Ti and Rh (including composite oxides), zinc sulfides such as ZnS, and the like. Among these materials, the high refractive index material film 13 is made of a material containing at least one selected from TiO ₂ , ZnS, Nb ₂ O ₅ , Ti ₃ O ₅ , ZrO ₂ , and WO _3. It is preferable that These materials have particularly excellent light transmittance, and the incident light that has passed through the opening 142 of the lacquer film 14 is suitable at the interface between the base material 12 and the high refractive index material film 13. Reflects and transmits. Therefore, the timepiece dial 1 provided with the high refractive index material film 13 made of these materials is excellent in aesthetic appearance while making the light transmittance particularly high.

  The average thickness of the high refractive index material film 13 is not particularly limited, but is preferably 0.005 to 0.3 μm, more preferably 0.007 to 0.1 μm, and 0.01 to More preferably, it is 0.05 micrometer. When the average thickness of the high refractive index material film 13 is a value within the above range, the light transmitting property of the timepiece dial 1 as a whole is sufficiently high and the aesthetic appearance is particularly excellent. In addition, the adhesion between the base material 12 and the lacquer film 14 can be made particularly excellent while sufficiently preventing the internal stress of the high refractive index material film 13 from increasing and causing cracks and the like. .

  The high refractive index material film 13 may be a laminate having a plurality of layers. Thereby, the adhesiveness with the base material 12 and the lacquer film | membrane 14 can further be improved, for example. More specifically, the layer on the side of the laminate that contacts the substrate 12 is made of a material that is excellent in adhesion to the substrate 12, and the layer on the side of the laminate that contacts the lacquer film 14 is a lacquer film. By configuring with a material that is excellent in adhesiveness with 14, the adhesiveness with the substrate 12 and the lacquer film 14 can be further improved.

[Lacquer film]
The lacquer film 14 includes a real part 141 arranged in a predetermined pattern, and the other part is an opening 142. And the real part 141 is mainly comprised with the material formed when the lacquer solidifies (oxidation polymerization). By providing such a lacquer film 14, the timepiece dial 1 can have a lacquer texture and color tone. Further, the lacquer film 14 has an excellent gloss (gloss) and an excellent lacquer texture and color tone by the reflected light from the high refractive index material film 13 described above, despite having the opening 142. Can be visually recognized.

  Hereinafter, lacquer will be described. Lacquer is generally obtained by purifying a sap obtained from a tree of Ursiaceae. In addition, lacquer generally contains urushiol, thiol, laccol, and components similar to them (eg, curdall). Lacquer oxidizes and polymerizes these components while taking in oxygen in the air by an enzyme, heat, or the like contained in the lacquer, thereby forming a film. The formed lacquer film has a unique texture and color tone, is excellent in aesthetic appearance, and is excellent in water resistance, heat resistance and chemical resistance. For this reason, the dial 1 for timepieces using lacquer as a material can obtain the unique texture and color tone of lacquer and has an excellent aesthetic appearance. In addition, the timepiece dial 1 is excellent in durability.

Moreover, it is preferable that lacquer contains urushiol as a main component. As a result, the timepiece dial 1 to be obtained has a particularly excellent texture and color tone of the lacquer film 14 and a particularly excellent aesthetic appearance.
Moreover, it is preferable that lacquer contains Fe. As a result, the lacquer can exhibit a particularly dark black color, and the unique color tone and texture appear more prominently. For this reason, the timepiece dial 1 obtained using such lacquer is particularly excellent in the texture and color tone of the lacquer, and the aesthetic appearance is particularly excellent.

  Moreover, although the real part 141 is mainly comprised of lacquer, it may contain a colorant. As the colorant, for example, a dye or a pigment can be used. By using these colorants, the color tone of the lacquer can be freely changed, and the design of the dial 1 for timepiece to be obtained can have variations. In addition, the pigment has excellent light resistance, and is particularly advantageous for stably maintaining an excellent appearance over a long period of time. Examples of the pigment include inorganic pigments and organic pigments, and known pigments can be used alone or in combination of two or more. Specific examples include, for example, mercury sulfide, ferric oxide, sulfide. Examples include arsenic and titanium oxide.

Further, as described above, the lacquer film 14 has the opening 142. Thereby, the light (external light) incident from the outer surface side of the base material 12 (from the upper side in FIG. 1) can be emitted to the main surface opposite to the outer surface side of the base material 12.
In the lacquer film 14, since the part where the real part 141 is not provided is the opening 142, the part not covered with the real part 141 of the base 12 functions as a transmission part that transmits light from the outside. The timepiece dial 1 can sufficiently transmit light from the outside. Thereby, the timepiece dial 1 can be suitably applied to, for example, a solar timepiece (a timepiece incorporating a solar cell), a solar radio timepiece, or the like.
And since the lacquer film 14 has the opening part 142 with the real part 141, while exhibiting the effect on the outstanding external appearance, the transmittance | permeability of the light as the timepiece dial 1 whole was fully excellent can do.

  The plurality of real parts 141 constituting the lacquer film 14 may be all made of the same material, or may be made of different materials. Further, the arbitrary real part 141 may have a uniform composition as a whole, or may have a different composition at each part. In particular, the lacquer film 14 has a plurality of areas composed of a plurality of real parts 141 on the base material 12, and the constituent material of the real part 141 may be different in each area. . By setting it as the above structures, the decorativeness of the timepiece dial 1 can further be improved.

Moreover, the real part 141 which comprises the lacquer film | membrane 14 may be formed by what kind of method, but in this embodiment, as it mentions later, from the head part, a lacquer film | membrane is caused by the vibration of a piezoelectric element. It is formed by discharging droplets 143 of a lacquer paint containing the constituent material 141 onto the high refractive index material film 13 of the substrate 12 in a predetermined pattern.
The shape (planar shape) of the real part 141 when viewed in plan is not particularly limited, but is formed by a method as will be described later, and is generally substantially circular so as to correspond to a droplet of lacquer paint. (See FIGS. 3 and 4). The real part 141 may have a shape in which a plurality of droplets are integrated. The real part 31 may be a stacked body formed by landing a plurality of droplets at the same point.

The arrangement pattern of the real part 141 (the arrangement pattern when viewed in plan) is not particularly limited, and may be anything. As an example, if the decorative pattern is a geometric pattern, for example, it may be arranged in a square lattice shape as shown in FIG. 3, or in a staggered lattice shape as shown in FIG. Also good. Further, as shown in FIGS. 5 and 6, a pattern in which a plurality of droplets 143 are overlapped to form and arrange a real part 141 may be used. Moreover, the pattern in which a part of the repetitive pattern having a regular shape as described above is missing may be used. Moreover, other arbitrary patterns may be sufficient, for example, a radial pattern, a spiral pattern, etc. may be sufficient.
Moreover, the some real part 141 which comprises the lacquer film 14 may have the same magnitude | size and shape, and a mutually different magnitude | size and shape may be sufficient as it.

  The average height (average thickness) of the real part 141 is not particularly limited, but is preferably 5 to 80 μm, and more preferably 10 to 60 μm. When the average height of the real part 141 is a value within the above range, the esthetic property of the timepiece dial 1 is particularly excellent while sufficiently preventing the internal stress of the lacquer film 14 (real part 141) from increasing. Can be. Further, the adhesion between the high refractive index material film 13 and the lacquer film 14 can be made particularly excellent. Further, the light transmittance of the timepiece dial 1 as a whole can be made sufficiently large. On the other hand, when the average height of the real part 141 is less than the lower limit value, depending on the constituent material of the lacquer film 14, it is difficult to sufficiently exhibit the features such as the texture and color tone of the lacquer film 14, It may be difficult to sufficiently enhance the aesthetics of the timepiece dial 1 as a whole. Moreover, depending on the constituent material of the lacquer film 14 and the base material 12, it may be difficult to sufficiently improve the adhesion between the base material 12 and the lacquer film 14. Moreover, when the real part 141 average height exceeds the said upper limit, the dispersion | variation in the film thickness in each site | part of the lacquer film 14 tends to become large. Further, when the average height of the real part 141 is particularly large, the internal stress becomes high, and the real part 141 may be easily peeled off. Further, when the average height of the real part 141 exceeds the upper limit value, the light transmittance of the timepiece dial 1 as a whole tends to decrease.

  Further, the width of the real part 141 represented by d in FIGS. 3 and 4 (particularly, the diameter when the real part 141 is substantially circular) is not particularly limited, but is preferably 5 to 100 μm. More preferably, it is ˜50 μm. When the width of the real part 141 is a value within the above range, the light transmission as the timepiece dial 1 is sufficiently high, and the aesthetic appearance (aesthetics) of the timepiece dial 1 is particularly excellent. Can be. On the other hand, when the width of the real part 141 is less than the lower limit value, it is difficult to make the appearance of the timepiece dial 1 sufficiently excellent depending on the constituent material and thickness of the lacquer film 14. There is a possibility. On the other hand, if the width of the real part 141 exceeds the upper limit, depending on the ratio of the area occupied by the real part 141, it may be difficult to sufficiently increase the light transmittance of the timepiece dial 1 as a whole. is there.

  Moreover, the pitch between the real parts 141 represented by p in FIGS. 3 and 4 is not particularly limited, but is preferably 5 to 120 μm, and more preferably 10 to 60 μm. When the pitch between the real parts 141 is a value within the above range, the light transmission as the timepiece dial 1 is sufficiently high, and the aesthetic appearance (aesthetics) of the timepiece dial 1 is particularly excellent. Can be. On the other hand, if the pitch between the real parts 141 is less than the lower limit value, it is difficult to sufficiently increase the light transmittance of the timepiece dial 1 as a whole, depending on the proportion of the area occupied by the real parts 141. There is a possibility. On the other hand, if the pitch between the real parts 141 exceeds the upper limit, depending on the constituent material, thickness, etc. of the lacquer film 14, it may be difficult to make the appearance of the timepiece dial 1 sufficiently excellent. There is sex.

  In addition, pd as described above preferably satisfies the relationship of 0.5 ≦ pd ≦ 15, and more preferably satisfies the relationship of 1.0 ≦ pd ≦ 10. By satisfying such a relationship, the light transmission of the timepiece dial 1 can be made particularly excellent, and the reflection of light by the high refractive index material film 13 can be made moderate. The color tone can be visually recognized as being particularly excellent.

  When the base material 12 (timepiece dial 1) is viewed in plan, the aperture ratio (the aperture ratio in the effective region) that is the ratio of the area of the opening 142 that is not covered with the real part 141 is not particularly limited. It is preferably 10 to 40%, and more preferably 20 to 30%. When the aperture ratio is a value within the above range, the light transmission as the timepiece dial 1 is sufficiently high, and the aesthetic appearance (aesthetics) of the timepiece dial 1 is particularly excellent. be able to. On the other hand, if the aperture ratio is less than the lower limit, it may be difficult to sufficiently increase the light transmittance of the timepiece dial 1 as a whole. On the other hand, when the aperture ratio exceeds the upper limit, depending on the constituent material, thickness, and the like of the lacquer film 14, it may be difficult to make the appearance of the timepiece dial 1 sufficiently excellent.

  The light transmittance of the entire timepiece dial 1 is not particularly limited, but is preferably 10 to 50%, and more preferably 20 to 40%. When the transmittance is a value within the above range, the texture and color tone of the lacquer film on the substrate 12 can be made particularly excellent, and the aesthetic appearance (aesthetics) of the timepiece dial 1 is particularly excellent. Can be. On the other hand, when the transmittance is less than the lower limit, there is a possibility that a sufficient amount of light for power generation in the solar cell 88 may not be obtained when applied to a timepiece as described later. On the other hand, if the transmittance exceeds the upper limit, it may be difficult to make the appearance of the timepiece dial 1 sufficiently excellent depending on the configuration and thickness of the timepiece dial 1. .

<Manufacturing method of timepiece dial>
Next, a method for manufacturing the timepiece dial described above will be described.
FIG. 7 is a cross-sectional view showing a preferred embodiment of the timepiece dial manufacturing method of the present invention.
The timepiece dial of the present invention may be manufactured by any method, but as shown in FIG. 7, the timepiece dial manufacturing method of the present embodiment is made of a light-transmitting material. The lacquer coating material containing lacquer is liquidated from the head portion by the high refractive index material film forming step (7b) for forming the high refractive index material film 13 on the configured base material (7a) and the vibration of the piezoelectric element. And a lacquer film forming step (7d) in which the liquid droplets are intermittently ejected as droplets (7c) and landed on the high refractive index material film in a predetermined pattern to form a lacquer film.

[Base material]
First, the base material 12 is prepared (7a).
As the base material 12, those described above can be used.
Further, the surface of the substrate 12 may be subjected to surface processing such as mirror surface processing, streak processing, and satin processing. Thereby, it becomes possible to give a variation in the glossiness of the surface of the timepiece dial 1 to be obtained, and the decorativeness of the timepiece dial 1 to be obtained can be further improved.
Moreover, the dial 1 for timepieces manufactured using the base material 12 which gave such surface processing is obtained by performing the said surface processing with respect to the high refractive index material film | membrane 13 and the lacquer film | membrane 14. Compared to the above, glare of the lacquer film 14 is suppressed, and the aesthetic appearance is particularly excellent.

[High refractive index material film formation process]
A high refractive index material film 13 made of a material having a higher refractive index than that of the material constituting the substrate 12 and having light transmittance is formed on the substrate 12 (7b).
The formation method of the high refractive index material film 13 is not particularly limited. For example, spin coating, dipping, brush coating, spray coating, electrostatic coating, electrodeposition coating, etc., electrolytic plating, immersion plating, electroless plating, etc. Examples include wet plating methods, chemical vapor deposition methods (CVD) such as thermal CVD, plasma CVD, and laser CVD, dry plating methods (vapor deposition methods) such as vacuum deposition, sputtering, and ion plating, and thermal spraying. The dry plating method (vapor phase film forming method) is preferable. By applying a dry plating method (vapor phase film forming method) as a method for forming the high refractive index material film 13, it has a uniform film thickness, is homogeneous, and has particularly excellent adhesion to the substrate 12. The high refractive index material film 13 can be reliably formed. As a result, the aesthetic appearance and durability of the timepiece dial 1 finally obtained can be made particularly excellent. Further, by applying a dry plating method (vapor phase film formation method) as a method for forming the high refractive index material film 13, even if the high refractive index material film 13 to be formed is relatively thin, the film thickness can be reduced. The variation can be made sufficiently small. Therefore, for example, the light transmission of the timepiece dial 1 can be improved while the durability of the obtained timepiece dial 1 is sufficiently high. Therefore, the obtained timepiece dial 1 can be more suitably applied to timepiece parts such as a solar timepiece and a solar radio timepiece.

  Among the dry plating methods (vapor phase film forming methods) as described above, sputtering is particularly preferable. By applying sputtering as a method for forming the high refractive index material film 13, the above effects become more prominent. That is, by applying sputtering as a method for forming the high refractive index material film 13, the high refractive index material film 13 having a uniform film thickness, uniform, and particularly excellent adhesion to the substrate 12 is obtained. It can form more reliably. As a result, the aesthetic appearance and durability of the finally obtained timepiece dial 1 can be further improved. Further, by applying sputtering as a method of forming the high refractive index material film 13, even if the high refractive index material film 13 to be formed is relatively thin, the variation in film thickness is particularly small. it can. For this reason, for example, the light transmission of the timepiece dial 1 can be further improved while improving the durability of the timepiece dial 1 to be obtained. Therefore, the obtained timepiece dial 1 can be more suitably applied as a timepiece dial such as a solar timepiece or a solar radio timepiece.

When the dry plating method as described above is applied, for example, if the material constituting the high refractive index material film 13 is an oxide of various metal materials as described above, it corresponds to these metal oxides. By using a metal as a target and performing the treatment in an atmosphere containing oxygen gas, the high refractive index material film 13 can be easily and reliably formed.
The formation of the high refractive index material film 13 may be performed by combining a plurality of different methods and conditions. Thereby, the high-refractive-index material film 13 comprised with the laminated body as mentioned above can be formed suitably.

[Lacquer film forming process]
Next, a lacquer coating liquid droplet 143 is ejected onto the high refractive index material film of the base material 12 (7c), a lacquer film 14 is formed (lacquer film forming step) (7d), and the timepiece dial 1 is obtain.
The discharge of the lacquer coating liquid droplet 143 is performed by discharging the lacquer coating liquid droplet 143 containing the constituent material of the lacquer film 14 in a predetermined pattern from the head unit 5 by the vibration of the piezoelectric element. By discharging the droplets 143 in this manner, the lacquer film 14 (real part 141) having a desired fine pattern can be reliably formed, and can be formed efficiently and in a short time. In addition, various timepiece dials can be easily manufactured by changing the droplet discharge program. That is, it can respond suitably also to multi-item production.

  In addition, lacquer is brought into contact with air, so that oxygen in the air is taken in, and main components such as urushiol are oxidized and solidified. As described above, by discharging the lacquer coating material as the fine droplets 143, the discharged droplets 143 can come into contact with a large amount of air, and the polymerization reaction starts quickly. For this reason, the droplet 143 of the lacquer coating landed on the base material 12 has a higher viscosity than the lacquer paint before discharge, and can reliably prevent the substrate 12 from spreading wet. For this reason, the lacquer film | membrane 14 which has the real part 141 and the opening part 142 of a desired pattern can be formed easily and reliably. Moreover, since the droplet 143 landed on the base material 12 has a high viscosity, a further droplet 143 can be landed on the droplet 143 to form the laminated lacquer film 14. For this reason, the real part 141 having a desired size and a relatively large thickness can be suitably formed. Further, when the droplets 143 are stacked, the stacked body can be suitably formed without being mixed. For this reason, the lacquer film 14 with various textures and colors can be formed by stacking.

<< lacquer paint >>
The lacquer paint contains at least lacquer as described above.
Moreover, the lacquer coating material may contain liquid media, such as a coloring agent, a solvent, and a dispersion medium, as needed.
It does not specifically limit as a coloring agent, For example, what is used as a constituent material of the lacquer film | membrane 14 as mentioned above can be used.

  The liquid medium is not particularly limited, and a known solvent or dispersion medium can be used. For example, inorganic compounds such as water, camphor (camphor oil), α-pinene, β-pinene and the like can be used. Terpene compounds, ketone compounds such as acetone, alcohol compounds such as ethanol and methanol, ether compounds, cellosolve compounds, aliphatic hydrocarbon compounds, aromatic hydrocarbon compounds, aromatic heterocyclic compounds, amides Examples thereof include organic compounds such as compounds, halogen compounds, ester compounds, amine compounds, nitrile compounds, nitro compounds, aldehyde compounds, etc., and use a mixture of one or more selected from these compounds be able to. When the lacquer paint contains a liquid medium, the droplets 143 can be discharged smoothly, and the fruit 141 having a desired shape can be easily and reliably formed in a desired pattern. In particular, when a terpene-based compound is used as a liquid medium, the lacquer film 14 has particularly excellent gloss in the obtained timepiece dial 1, and the lacquer texture and color tone of the timepiece dial 1 are particularly excellent. It will be a thing.

Moreover, components other than the material mentioned above may be contained in the lacquer paint. Examples of such components include a dispersant, a resin material, a pH adjuster, a surface tension adjuster, a viscosity adjuster, an ultraviolet absorber, an antioxidant, an anti-drying agent, an evaporation accelerator, an antifoaming agent, and an antifungal agent. An agent, a preservative, a rust preventive agent, etc. are mentioned, and these can use a well-known thing.
Although the viscosity of such a lacquer coating is not particularly limited, it is usually preferably 1 to 100 mPa · s, and more preferably 2 to 80 mPa · s. When the viscosity of the lacquer paint is a value within the above range, the lacquer film 14 having a precise shape and a predetermined thickness can be discharged more stably from the head unit 5. It can be formed more easily and reliably. In the present specification, unless otherwise specified, “viscosity” refers to a viscosity measured at 25 ° C. according to JIS Z8809.

Further, the volume of one droplet of the droplet 143 is not particularly limited, but is usually preferably 0.1 to 40 pL, and more preferably 0.5 to 30 pL. When the average volume of one droplet of the droplet 143 is a value within the above range, the lacquer film 14 having a more precise shape and a predetermined thickness can be easily and reliably formed.
In this step, the temperature of the atmosphere when discharging is preferably 10 to 45 ° C, and more preferably 15 to 40 ° C. Thereby, the enzyme contained in the lacquer coating can be activated more and the polymerization reaction of the lacquer in the discharged droplet can be started reliably. For this reason, it is possible to reliably prevent the droplet 143 of the lacquer paint that has landed on the base material 12 from spreading on the base material 12, and to easily and reliably form the real part 141 and the opening part 142 of a desired pattern. The lacquer film 14 can be formed. For this reason, the timepiece dial 1 to be obtained has a particularly excellent lacquer texture and color tone, and is particularly excellent in aesthetic appearance and light transmittance.

  Moreover, in this process, it is preferable that the humidity of the atmosphere at the time of discharge is 55 to 95%, and it is more preferable that it is 60 to 90%. Thereby, the enzyme contained in the lacquer coating can be activated more and the polymerization reaction of the lacquer in the discharged droplet can be started reliably. For this reason, it is possible to reliably prevent the droplet 143 of the lacquer paint that has landed on the base material 12 from spreading on the base material 12, and to easily and reliably form the real part 141 and the opening part 142 of a desired pattern. The lacquer film 14 can be formed. For this reason, the timepiece dial 1 to be obtained has a particularly excellent lacquer texture and color tone, and is particularly excellent in aesthetic appearance and light transmittance.

  Moreover, in this process, it is preferable that the temperature of the base material 12 shall be 100-200 degreeC, and it is more preferable to set it as 120-180 degreeC. Thereby, when the droplet 143 of a lacquer paint lands on the base material 12, the lacquer contained in the lacquer paint can be rapidly oxidized and polymerized by heat. For this reason, it is possible to reliably prevent the droplet 143 of the lacquer paint that has landed on the base material 12 from spreading on the base material 12, and to easily and reliably form the real part 141 and the opening part 142 of a desired pattern. The lacquer film 14 can be formed. Moreover, the unintentional quality change and deformation | transformation of the base material 12 and the lacquer film 14 can be prevented as it is such a temperature range.

In this step, one real part 141 may be formed with a plurality of droplets 143. Thereby, the lyophilicity and liquid repellency of the landing surface can be controlled, and the size and shape of the real part 141 can be reliably controlled.
In this step, the lacquer film 14 may be completely solidified by performing a heat treatment such as heating or cooling, a decompression process, or the like as necessary after the discharge of the droplets as described above.

<Clock>
Next, the timepiece of the present invention provided with the timepiece dial 1 of the present invention as described above will be described.
The timepiece of the present invention has the timepiece dial 1 of the present invention as described above. As described above, the timepiece dial 1 of the present invention is excellent in electromagnetic wave permeability (light permeability) and decorativeness (aesthetic appearance). For this reason, the timepiece of the present invention provided with such a timepiece dial 1 can sufficiently satisfy the required requirements as a solar timepiece or a radio timepiece. As the parts other than the timepiece dial 1 (the timepiece dial 1 of the present invention) constituting the timepiece of the present invention, known parts can be used. An example will be described.

FIG. 8 is a cross-sectional view showing a preferred embodiment of the timepiece (watch) of the present invention.
As shown in FIG. 8, a wristwatch (portable watch) 100 according to this embodiment includes a case (case) 72, a back cover 73, a bezel (edge) 74, and a glass plate (cover glass) 75. . Further, in the case 72, the timepiece dial 1 of the present invention as described above, the solar cell 88, and the movement 71 are accommodated, and a hand (pointer) (not shown) is accommodated. .

The glass plate 75 is usually made of transparent glass or sapphire having high transparency. Thereby, while being able to fully exhibit the aesthetics of the timepiece dial 1 of the present invention, a sufficient amount of light can be incident on the solar cell 88.
The movement 71 uses the electromotive force of the solar cell 88 to drive the pointer.
Although omitted in FIG. 8, in the movement 71, for example, an electric double layer capacitor for storing the electromotive force of the solar battery 88, a lithium ion secondary battery, a crystal oscillator as a time reference source, a crystal vibration A semiconductor integrated circuit that generates a driving pulse that drives the clock based on the oscillation frequency of the child, a step motor that drives the wheel train mechanism every second in response to this driving pulse, and a movement of the step motor A train wheel mechanism for transmitting to the vehicle is provided.
The movement 71 includes a radio wave receiving antenna (not shown). And it has the function to perform time adjustment etc. using the received electromagnetic wave.

The solar cell 88 has a function of converting light energy into electric energy. The electric energy converted by the solar battery 88 is used for driving the movement.
In the solar cell 88, for example, a p-type impurity and an n-type impurity are selectively introduced into a non-single-crystal silicon thin film, and a p-type non-single-crystal silicon thin film and an n-type non-single-crystal silicon thin film are used. It has a pin structure provided with an i-type non-single-crystal silicon thin film with a low impurity concentration in between.

A winding stem pipe 76 is fitted and fixed to the barrel 72, and a shaft 771 of a crown 77 is rotatably inserted into the winding stem pipe 76.
The body 72 and the bezel 74 are fixed by a plastic packing 78, and the bezel 74 and the glass plate 75 are fixed by a plastic packing 79.
Further, a back cover 73 is fitted (or screwed) to the barrel 72, and a ring-shaped rubber packing (back cover packing) 84 is inserted into the joint portion (seal portion) 85 in a compressed state. Has been. With this configuration, the seal portion 85 is sealed in a liquid-tight manner, and a waterproof function is obtained.

  A groove 772 is formed in the outer periphery of the shaft 771 of the crown 77, and a ring-shaped rubber packing (crown packing) 83 is fitted in the groove 772. The rubber packing 83 is in close contact with the inner peripheral surface of the winding stem pipe 76 and is compressed between the inner peripheral surface and the inner surface of the groove 772. With this configuration, the space between the crown 77 and the winding stem pipe 76 is liquid-tightly sealed, and a waterproof function is obtained. When the crown 77 is rotated, the rubber packing 83 rotates together with the shaft portion 771 and slides in the circumferential direction while being in close contact with the inner peripheral surface of the winding stem pipe 76.

In the above description, a wristwatch (portable clock) is described as an example of a clock, but the present invention is similarly applied to other types of clocks such as a portable clock, a table clock, and a wall clock other than the wristwatch. be able to.
As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to these.

  For example, the timepiece dial of the present invention is provided with a coat layer (protective film) made of a light-transmitting material provided on the surface opposite to the surface facing the high refractive index material film of the lacquer film. You may have. By having such a coat layer (protective film), for example, it is possible to adjust glossiness, color tone, etc. while making the light transmittance sufficiently high, and to further improve the aesthetic appearance of the timepiece dial. Can be. Further, by having such a coat layer (protective film), for example, the watch dial as a whole, such as corrosion resistance, weather resistance, water resistance, oil resistance, scratch resistance, abrasion resistance, discoloration resistance, etc. Various characteristics can be improved, and deterioration or modification of the lacquer film or the like due to the influence of the external environment can be more reliably prevented. As a result, the durability as a timepiece dial can be made particularly excellent.

In the above-described embodiment, the base material and the high refractive index material film are adjacent to each other, and the high refractive index material film and the lacquer film are adjacent to each other. There may be an intermediate layer.
Moreover, in embodiment mentioned above, although the lacquer was demonstrated as what is extract | collected from a tree and refine | purified, it is not limited to such a thing. For example, the lacquer may be produced by synthesis. As such a thing, artificial lacquer (cashew paint) etc. which processed cashew oil contained in the shell of cashew nut etc. are mentioned, for example.

  Moreover, the manufacturing method of the timepiece dial of the present invention is not limited to the method described above. For example, a lacquer coating is performed on a high refractive index material film with a mask of a predetermined pattern arranged to form a lacquer film having a real part and an opening of a predetermined size. Also good. For example, the lacquer film may be formed by a coating method such as a spin coating method. In this case, the opening can be formed by laser irradiation, etching, or the like.

Next, specific examples of the present invention will be described.
1. Manufacture of timepiece dial (Example 1)
A timepiece dial (watch dial) was manufactured by the following method.
First, the base material which has the shape of the timepiece dial was produced by compression molding using polycarbonate, and then necessary portions were cut and polished. The obtained base material was substantially disk-shaped and had a diameter of about 27 mm and a thickness of about 0.5 mm.

Next, this base material was washed. As the cleaning of the substrate, first, alkali immersion degreasing was performed for 30 seconds, and then neutralization was performed for 10 seconds, water washing for 10 seconds, and pure water cleaning for 10 seconds.
A high refractive index material film composed of TiO ₂ was formed on the surface of the substrate thus cleaned by sputtering as described below (high refractive index material film forming step).
First, the cleaned substrate was mounted in a sputtering apparatus, and then the inside of the sputtering apparatus was evacuated (depressurized) to 3 × 10 ⁻³ Pa while preheating the apparatus.

Next, while introducing argon gas at an argon gas flow rate of 40 ml / min, oxygen was introduced at an oxygen flow rate of 10 ml / min. In this state, titanium Ti is used as a target, and discharge is performed under the conditions of input power: 1400 W and processing time: 3.0 minutes, whereby a high refractive index composed of TiO ₂ (refractive index 2.51). A material film was formed.
The average thickness of the high refractive index material film thus formed was 0.01 μm.

Next, a lacquer coating mainly containing lacquer was prepared.
First, crude lacquer (Arami lacquer) was purified to obtain purified lacquer. As the rough lacquer (Arami lacquer), one containing 66 wt% urushiol was used. First, impurities were removed by filtering the crude lacquer. The crude lacquer was slowly stirred in a container, and then iron hydroxide was added while maintaining stirring. At the stage where the crude lacquer was sufficiently black, the crude lacquer was slowly heated and kept at 40 ° C. to continue stirring. When the content of crude urushiol was 86 wt%, heating and stirring were stopped, and filtration was performed again to obtain purified lacquer.

Next, a lacquer paint was prepared. The lacquer paint was obtained by diluting lacquer with turpentine oil (mainly containing α-pinene and β-pinene mixture). At this time, the viscosity of the lacquer coating was 50 mPa · s.
Next, droplets of lacquer paint are ejected from the head portion on the high refractive index material film of the base material in a houndstooth check pattern as shown in FIG. A film was formed (lacquer film forming process). The average volume of one droplet of the discharged lacquer paint droplet was 10 pL.
The atmosphere at the time of discharge was 80% humidity and a temperature of 25 ° C., and the substrate was heated to 150 ° C.

The lacquer film formation process was repeated in the same manner (3 times in total) to obtain a lacquer film. The average thickness of the formed real part was 18 μm. Moreover, the width | variety (average diameter) of the real part was 25 micrometers, and the pitch between real parts was 28 micrometers. The difference between the width of the real part and the pitch was 3 μm. Moreover, the ratio (opening ratio) of the part (opening part) in which the real part was not formed in the lacquer film when the base material was viewed in plan was 28%.
Next, the temperature of the base material was set to 150 ° C., and the lacquer film was completely solidified by heating.
As a result, a timepiece dial was obtained.
In addition, the thickness of the base material and the lacquer film was measured according to the microscope cross-sectional test method prescribed | regulated by JISH5821.

(Examples 2 to 12)
A timepiece dial was manufactured in the same manner as in Example 1 except that the base material, high refractive index material film, lacquer film, lacquer, lacquer coating material, and composition were changed as shown in Table 1.
(Examples 14 and 15)
The coloring process by iron hydroxide was not performed at the time of the preparation of lacquer, and what was shown in Table 1 was added to the lacquer paint as a pigment. Moreover, the dial for timepieces was manufactured like the said Example 1 except having made the base material, the high refractive index material film | membrane, the material of a lacquer film, the lacquer | lacquer, and the lacquer coating material into the structure of Table 1.

(Example 16)
A timepiece dial was manufactured in the same manner as in Example 1 except that the lacquer film was formed by applying a lacquer paint in a state where a mask having a predetermined pattern was arranged.
In addition, the lacquer film is formed by painting in a state where a mask having a pattern as shown in FIG. 4 is reversed (a mesh mask in which circular openings are regularly arranged in a staggered pattern). did. The mask was made of stainless steel (SUS444), and its thickness was 150 μm. Further, as shown in FIG. 4, this mask had a constant cross-sectional area in the thickness direction. Also, in this step, a magnet is disposed on the surface of the substrate opposite to the surface facing the mask, and the substrate on which the high refractive index material film is provided and the mask are in close contact with the magnet. I went there.

(Comparative Example 1)
A timepiece dial was manufactured in the same manner as in Example 1 except that a lacquer film was formed directly on the surface of the cleaned substrate without forming a high refractive index material film. In addition, the composition of the lacquer paint and the lacquer film was changed as shown in Table 1.
(Comparative Example 2)
In the high refractive index material film forming step, the high refractive index material film is formed using Al ₂ O ₃ (refractive index 1.60), and the processing time is changed to change the average thickness of the high refractive index material film. A timepiece dial was manufactured in the same manner as in Example 1 except that Table 1 was changed as shown in Table 1. In addition, the composition of the lacquer paint and the lacquer film was changed as shown in Table 1.

(Comparative Example 3)
A timepiece dial was manufactured in the same manner as in Example 1 except that the base material, high refractive index material film, lacquer film, lacquer, lacquer coating material, and composition were changed as shown in Table 1.
(Comparative Example 4)
Lacquer and a base material were prepared in the same manner as in Example 1, and a high refractive index material film was formed on the base material.
Next, lacquer was diluted with turpentine oil to obtain a lacquer paint having a predetermined viscosity as shown in Table 1. Using this lacquer paint, spin coating was applied twice to form a lacquer film to produce a timepiece dial.

(Comparative Example 5)
Lacquer and a base material were prepared in the same manner as in Example 1, and a high refractive index material film was formed on the base material.
Next, lacquer was diluted with turpentine oil to obtain a lacquer paint having a predetermined viscosity as shown in Table 1. This lacquer paint was applied by a spin coat method to form a lacquer film to produce a timepiece dial.
About each Example and each comparative example, the structure of the lacquer used for manufacture of the dial for timepieces, a lacquer coating material, a lacquer film, and a high refractive index material film is put together in Table 1, and is shown.

2. Appearance evaluation of timepiece dials Each timepiece dial produced in each of the above examples and comparative examples was visually observed, and the appearance was evaluated according to the following five-stage criteria.
A: Appearance is very good.
A: Appearance is excellent.
○: Good appearance.
Δ: Appearance is slightly poor.
X: Appearance defect.

Further, the gloss of the timepiece dial was visually observed, and the gloss was evaluated according to the following four criteria.
A: Excellent gloss.
○: Good gloss.
Δ: Somewhat glossy.
X: Poor gloss.

3. Evaluation of light transmittance of timepiece dial The light transmittance of each timepiece dial manufactured in each of the above Examples and Comparative Examples was evaluated by the following method.
First, the solar cell and each dial were placed in a dark room. Thereafter, light from a fluorescent lamp (light source) separated by a predetermined distance was made incident on the light receiving surface of the solar cell alone. At this time, the power generation current of the solar cell was A [mA]. Next, light from a fluorescent lamp (light source) spaced a predetermined distance was made incident in the same manner as described above in a state where the dial plate was superimposed on the upper surface of the light receiving surface of the solar cell. In this state, the generated current of the solar cell was B [mA]. Then, the light transmittance of the dial represented by (B / A) × 100 was calculated and evaluated according to the following five-stage criteria. It can be said that the greater the light transmittance of the dial, the better the light transmittance of the dial.

A: 32% or more.
A: 29% or more and less than 32%.
○: 25% or more and less than 29%.
Δ: 17% or more and less than 25%.
X: Less than 17%.

Thereafter, a wristwatch as shown in FIG. 8 was manufactured using the dial plates manufactured in the respective Examples and Comparative Examples. Then, each manufactured wristwatch was put in a dark room. Thereafter, light from a fluorescent lamp (light source) spaced a predetermined distance was made incident from a surface on the dial side (surface on the glass plate) of the watch. At this time, the irradiation intensity was changed at a constant speed so that the irradiation intensity of light gradually increased. As a result, in the timepiece of the present invention, the movement was driven even when the irradiation intensity was relatively small. On the other hand, in the timepieces of Comparative Examples 3 and 4, the movement was not confirmed even when the irradiation intensity was relatively high.
These results are shown in Table 2.

  As is clear from Table 2, the timepiece dial according to the present invention had an excellent aesthetic appearance and was excellent in light transmittance. On the other hand, in the comparative example, a satisfactory result was not obtained. That is, the timepiece dial of Comparative Example 1 did not have a high refractive index material film in the opening, and therefore, the color tone and texture of lacquer could not be improved, and the aesthetic appearance was inferior. Moreover, the timepiece dial of Comparative Example 2 was not able to obtain gloss appropriately, and the color tone and texture of lacquer were not excellent, and the aesthetic appearance was inferior. Further, the timepiece dial of Comparative Example 3 was too poor in light transmittance due to excessive reflection on the high refractive index material film. Moreover, since reflection occurred too much, the lacquer film was visually recognized as having a glare, and could not have an excellent lacquer texture and color tone. Moreover, although the timepiece dial of Comparative Example 4 has an excellent aesthetic appearance, it does not have an opening and therefore has poor light transmission. Moreover, although the timepiece dial of Comparative Example 5 has light permeability, the lacquer film was thin and the aesthetic appearance was inferior.

Further, a timepiece as shown in FIG. 8 was assembled using the timepiece dials obtained in each Example and each Comparative Example. Each timepiece thus obtained was tested and evaluated in the same manner as described above, and the same results as described above were obtained.
Furthermore, the timepiece dial plate manufactured in each of the examples and the comparative examples is arranged on the outer surface side (side on which light is incident) of the wristwatch internal module (movement) provided with the antenna for receiving radio waves, and in this state The radio wave reception sensitivity of the watch internal module (movement) was evaluated. As a result, those using the timepiece dial obtained in each example were also excellent in electromagnetic wave permeability.

It is sectional drawing which shows suitable embodiment of the timepiece dial of this invention. It is the model which showed a mode that the light injects into the opening part with which the timepiece dial was equipped. It is a top view which shows an example of the arrangement pattern of a real part in the timepiece dial shown in FIG. It is a top view which shows an example of the arrangement pattern of a real part in the timepiece dial shown in FIG. It is a top view which shows an example of the arrangement pattern of a real part in the timepiece dial shown in FIG. It is a top view which shows an example of the arrangement pattern of a real part in the timepiece dial shown in FIG. It is sectional drawing which shows suitable embodiment of the manufacturing method of the timepiece dial of this invention. It is a fragmentary sectional view which shows suitable embodiment of the timepiece (portable timepiece) of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Timepiece dial 12 ... Base material 13 ... High refractive index material film 14 ... Lacquer film 141 ... Real part 142 ... Opening part (transmission part) 143 ... Droplet 2 ... Timepiece dial 22 ... Base material 24 ... Lacquer Membrane 242 ... Opening part (transmission part) 5 ... Head part 71 ... Movement 72 ... Body (case) 73 ... Back cover 74 ... Bezel (edge) 75 ... Glass plate (cover glass) 76 ... Winding pipe 77 ... Crown 771 ... Shaft part 772 ... Groove 78 ... Plastic packing 79 ... Plastic packing 83 ... Rubber packing (Crown packing) 84 ... Rubber packing (back cover packing) 85 ... Joint part (seal part) 88 ... Solar cell 100 ... Watch (portable watch) )

Claims (11)

A base material made of a material having optical transparency;
A high-refractive-index material film made of a material having a refractive index higher than that of the material constituting the base material and having light transmittance;
Provided on the surface side opposite to the surface facing the base material of the high refractive index material film, and having a lacquer film mainly composed of lacquer,
The lacquer film is provided with an opening,
When the absolute refractive index of the material constituting the high refractive index material film is n ₃ and the absolute refractive index of the material constituting the base material is n ₂ , 0.1 ≦ n ₃ −n ₂ ≦ 1.34 A timepiece dial characterized by satisfying the relationship.   The timepiece dial according to claim 1, wherein the lacquer includes urushiol.   The timepiece dial according to claim 1, wherein the lacquer film includes Fe.   The timepiece dial according to any one of claims 1 to 3, wherein an area ratio occupied by the opening when the lacquer film is viewed in plan is 10 to 40%. 5. The timepiece dial according to claim 1, wherein the high refractive index material film is a material selected from TiO ₂ , ZnS, Nb ₂ O ₅ , Ti ₃ O ₅ , ZrO ₂ , and WO _3. . The timepiece dial according to claim 1, wherein the n ₃ is 1.7 to 2.9.   The timepiece dial according to claim 1, wherein an average thickness of the high refractive index material film is 0.005 to 0.3 μm. The timepiece dial according to claim 1, wherein the n ₂ is 1.2 to 1.6.   The said base material is comprised with the material containing at least 1 sort (s) selected from a polycarbonate, an acrylonitrile butadiene styrene copolymer, or soda glass, and quartz glass. Clock dial. A high refractive index material film forming step of forming a high refractive index material film on a substrate composed of a material having light permeability;
Lacquer that lacquer paint containing lacquer is intermittently ejected as droplets from the head by vibration of the piezoelectric element, and the droplets land on the high refractive index material film in a predetermined pattern to form a lacquer film A film forming step,
When the absolute refractive index of the material constituting the high refractive index material film is n ₃ and the absolute refractive index of the material constituting the base material is n ₂ , 0.1 ≦ n ₃ −n ₂ ≦ 1.34 A timepiece dial manufacturing method characterized by satisfying the relationship. A timepiece dial according to claim 9 and a solar battery,
A timepiece having the timepiece dial arranged on a light receiving surface side of the solar cell.

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