JP2010107322A - Timepiece dial and timepiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a timepiece dial showing an appearance having an excellent feeling of the gloss, and a timepiece including the timepiece dial. <P>SOLUTION: In the timepiece dial 1, a plurality of scale-like powders 31 having a light-reflecting function are arranged on a substrate 2, and different-direction arrangement members 4 for directing each main surface of the plurality of powders 31 to each different direction are provided on the substrate 2. Preferably, each different-direction arrangement member 4 has an approximately spherical shape or an approximately cylindrical shape. The height of each different-direction arrangement member 4 is preferably in the range of 50-220 μm. Assuming that the height of the different-direction arrangement member 4 is X [μm], and a mean particle size of the powders 31 is Y [μm], the relation: 0.3≤X/Y≤1.7 is preferably satisfied. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a timepiece dial and a timepiece.

A timepiece dial is required to be practical, such as visibility, and to have decorativeness (aesthetic appearance). Conventionally, as a timepiece dial, a metal plate processed or a plastic substrate coated or coated with metal has been used.
In general, a timepiece dial uses letters and numbers (so-called time letters, etc.), scales, symbols, and various marks having functions such as indicating time. As a method for forming such an index, a printing method or a method of attaching and fixing a planting material called “typesetting” is widely used.
On the other hand, there is a great demand for a timepiece dial having a more excellent aesthetic appearance and a timepiece dial having a novel appearance.

In addition, solar watches (watches equipped with solar cells) have been highly evaluated from the viewpoint of ease of maintenance, resource saving, and resource saving.
A dial for a solar timepiece (a timepiece provided with a solar cell) is required to have a function (light transmittance) that transmits a sufficient amount of light so that the solar cell generates a sufficient electromotive force. For this reason, conventionally, a highly transparent plastic member has been used as a dial for a solar timepiece. However, plastics generally lack a sense of quality and are inferior in aesthetic appearance compared to metal materials such as Au and Ag. For this reason, a dial plate obtained by sticking a metal film made of a metal material and provided with an opening portion on a plastic substrate via an adhesive has been proposed (for example, see Patent Document 1). ).

  However, with such a dial, it has been difficult to achieve both excellent light transmission and aesthetic appearance. That is, in order to ensure light transmittance, when the aperture ratio of the metal film (the ratio of the area occupied by the opening to the entire metal film when the metal film is viewed in plan) is relatively high, Even though the presence is conspicuous and a metal material (metal film) is used, a sufficiently excellent aesthetic appearance cannot be obtained. In solar timepieces, generally solar cells exhibiting a dark color such as black or dark purple are used, but when solar timepieces are provided with such solar cells, openings and openings in the metal film Differences in color tone and brightness from other parts (parts covered with a metal film) become conspicuous, and as a result, the presence of the opening becomes very conspicuous, and the timepiece dial when applied to a watch The aesthetic appearance is particularly inferior. On the other hand, when the aperture ratio of the metal film is lowered for the purpose of improving the aesthetic appearance, the light transmittance is lowered, and the power generation efficiency of the solar cell is significantly lowered. Moreover, the manufacturing method of the above dial plates is also inferior in productivity.

JP 11-326549 A (see page 3, right column, line 35 to page 4, left column, line 11)

  An object of the present invention is to provide a timepiece dial having a glossy and excellent appearance, and to provide a timepiece having the timepiece dial.

Such an object is achieved by the present invention described below.
In the timepiece dial of the present invention, a plurality of scale-like powders having a function of reflecting light is disposed on a substrate,
The substrate is provided with different direction arrangement means on the substrate so that the principal surfaces of the plurality of powders face different directions.
Thereby, it is possible to provide a timepiece dial having a glossy and excellent appearance.

In the timepiece dial of the present invention, it is preferable that the powder has a dispersion layer in which the powder is dispersed in a dispersion medium.
Thereby, the aesthetic appearance of the timepiece dial can be made particularly excellent. Further, the durability of the timepiece dial can be improved.
In the timepiece dial of the present invention, when the refractive index of the dispersion medium constituting the layer is n _M and the refractive index of the constituent material of the substrate is n _B , | n _M −n _B | ≦ 0.18 It is preferable to satisfy this relationship.
Thereby, the aesthetic appearance of the timepiece dial can be made particularly excellent.

In the timepiece dial according to the aspect of the invention, it is preferable that the different direction arrangement means is an uneven surface of the substrate.
Thereby, the aesthetic appearance of the timepiece dial can be made easier and more reliable.
In the timepiece dial according to the aspect of the invention, it is preferable that the uneven surface has regularly provided unevenness.
Thereby, the aesthetic appearance of the timepiece dial can be made particularly excellent.

In the timepiece dial according to the aspect of the invention, it is preferable that the different direction arrangement means has a substantially conical shape.
Thereby, the aesthetic appearance of the timepiece dial can be made particularly excellent.
In the timepiece dial of the present invention, it is preferable that the height difference of the uneven surface is 50 to 220 μm.
Thereby, the aesthetic appearance of the timepiece dial can be made particularly excellent.

In the timepiece dial of the present invention, when the height difference of the uneven surface is X [μm] and the average particle diameter of the powder is Y [μm], the relationship of 0.3 ≦ X / Y ≦ 1.7 is satisfied. It is preferable to satisfy.
Thereby, the aesthetic appearance of the timepiece dial can be made particularly excellent.
In the timepiece dial according to the aspect of the invention, it is preferable that the different direction arrangement means is a different direction arrangement member provided separately on the substrate.
As a result, by selecting the amount of the different-direction arrangement member supplied on the substrate, the size of the different-direction arrangement member, etc., the variety of aesthetic appearances of the timepiece dial can be easily expanded. It is possible to cope with item production suitably.

In the timepiece dial according to the aspect of the invention, it is preferable that the different-direction arrangement member has a substantially spherical shape or a substantially cylindrical shape.
Thereby, the aesthetic appearance of the timepiece dial can be made particularly excellent.
In the timepiece dial according to the aspect of the invention, it is preferable that a height of the different direction arrangement member is 50 to 220 μm.
Thereby, the aesthetic appearance of the timepiece dial can be made particularly excellent.

In the timepiece dial of the present invention, 0.3 ≦ X / Y ≦ 1.7, where X is the height of the different-direction arrangement member and Y is the average particle size of the powder. It is preferable to satisfy the relationship.
Thereby, the aesthetic appearance of the timepiece dial can be made particularly excellent.
In the timepiece dial of the present invention, when the refractive index of the constituent material of the different-direction-arranged member is n _O and the refractive index of the constituent material of the substrate is n _B , | n _O −n _B | ≦ 0.18 It is preferable to satisfy this relationship.
Thereby, the aesthetic appearance of the timepiece dial can be made particularly excellent.

In the timepiece dial of the present invention, the light transmittance of the timepiece dial is preferably 20% or more.
Thereby, the timepiece dial can be suitably applied to a solar timepiece.
The timepiece of the present invention includes the timepiece dial of the present invention.
Thereby, it is possible to provide a timepiece including a timepiece dial having a glossy and excellent appearance. In addition, since the timepiece dial has a great influence on the appearance of the entire timepiece, the timepiece having the timepiece dial as described above has an excellent aesthetic appearance as a whole.

  ADVANTAGE OF THE INVENTION According to this invention, the timepiece dial which exhibits the glossy and outstanding external appearance can be provided, and the timepiece provided with the said timepiece dial can be provided.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. Note that the drawings referred to in this specification show part of the configuration in an emphasized manner, and do not accurately reflect actual dimensions and the like.
<Watch dial>
(First embodiment)
FIG. 1 is a sectional view showing a first embodiment of a timepiece dial according to the present invention.

As shown in FIG. 1, the timepiece dial 1 of this embodiment includes a substrate 2 and a dispersion layer 3 in which a plurality of scale-like powders (glossy powders) 31 having a function of reflecting light are dispersed. is doing.
Usually, the timepiece dial 1 is used so that the upper side in FIG. 1 faces the observer side (outer surface side) and the lower side in FIG. It is. In the following description, the upper side in FIG. 1 is referred to as “upper side”, and the lower side in FIG. 1 is referred to as “lower side” (the same applies to FIG. 2).

[substrate]
The substrate 2 has a function of holding the dispersion layer 3 containing the powder 31 as will be described in detail later, and forms the main part of the timepiece dial 1.
The substrate 2 may be made of any material, but is preferably made of a light transmissive material. Thereby, with the outstanding aesthetic appearance of the timepiece dial 1, it can be suitably applied to a solar timepiece dial (a dial provided in a timepiece equipped with a solar cell) that effectively uses excellent light transmittance. . In the present invention, “having light transmittance” means having a property of transmitting at least part of light in the visible light region (wavelength region of 380 to 780 nm), and preferably transmitting light in the visible light region. The rate is 50% or more, and more preferably the light transmittance in the visible light region is 60% or more. The light transmittance as described above is, for example, a white fluorescent lamp (manufactured by Toshiba Corporation, inspection fluorescent lamp FL20S-D65) as a light source, and a solar cell having the same shape as the measurement target substrate under 1000 lux ( Current value (B) when power is generated in the same state as described above, except that a substrate to be measured is placed on the light source side surface of the solar cell, relative to the current value (A) when power is generated by the solar cell) Ratio ((B / A) × 100 [%]) can be adopted. Further, the light transmittance of a timepiece dial described later can be obtained in the same manner as described above. Hereinafter, unless otherwise specified, in this specification, “light transmittance” refers to a value obtained under such conditions.

  Examples of the constituent material of the substrate 2 include various plastic materials and various glass materials, but the substrate 2 is preferably mainly composed of a plastic material. The plastic material is generally excellent in moldability (freedom of molding), and can be suitably applied to manufacture the timepiece dial 1 having various shapes. Further, if the substrate 2 is made of a plastic material, it is advantageous for reducing the manufacturing cost of the timepiece dial 1. In addition, since plastic materials are generally excellent in light (visible light) transmission and also in radio wave transmission, the timepiece dial 1 is assumed that the substrate 2 is made of a plastic material. Can be suitably applied to a radio timepiece as described later. In the following description, an example in which the substrate 2 is mainly composed of a plastic material will be mainly described. In the present invention, “mainly” means a component having the highest content among materials constituting the target portion (member), and the content is not particularly limited, but the target portion (member) It is preferable that it is 60 wt% or more of the material which comprises, More preferably, it is 80 wt% or more, It is further more preferable that it is 90 wt% or more.

  Examples of the plastic material constituting the substrate 2 include various thermoplastic resins, various thermosetting resins, and the like. For example, polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS resin), polymethyl methacrylate (PMMA). ), Etc., polyolefin resins such as polyethylene (PE) and polypropylene (PP), polyester resins such as polyethylene terephthalate (PET), etc., or copolymers, blends, polymer alloys, etc. mainly comprising these. These can be used, and one or more of these can be used in combination (for example, as a blend resin, a polymer alloy, a laminate, etc.). In particular, the substrate 2 is preferably composed mainly of polycarbonate and / or acrylonitrile-butadiene-styrene copolymer. Thereby, especially the intensity | strength as the timepiece dial 1 whole can be made excellent. Further, since the degree of freedom of molding of the substrate 2 is increased (easiness of molding is improved), even the timepiece dial 1 having a more complicated shape can be easily and reliably manufactured. Further, when the substrate 2 is made of a material containing at least one selected from polycarbonate (PC) and acrylonitrile-butadiene-styrene copolymer (ABS resin), the substrate 2 and the dispersion layer 3 are in close contact with each other. The property can be made particularly excellent. 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 the durability of the timepiece dial 1 as a whole can be further improved.

  In addition, the board | substrate 2 may contain components other than the above. Examples of such components include plasticizers, antioxidants, colorants (including various color formers, fluorescent substances, phosphorescent substances, etc.), brighteners, fillers, and the like. For example, when the substrate 2 is made of a material containing a colorant, variations in the color of the timepiece dial 1 can be widened.

The substrate 2 may have a substantially uniform composition at each site, or may have a different composition depending on the site.
In the timepiece dial 1 of the present embodiment, the surface (upper surface) of the substrate 2 is provided with a concavo-convex surface 21 as a different direction arrangement means for making a main surface of a powder 31 described later face a different direction. ing.

  As described above, in the present invention, the timepiece dial is provided with the different direction arrangement means for making the main surfaces of the plurality of powders having the function of reflecting light face in different directions. Thereby, the aesthetic appearance of the timepiece dial can be made excellent. More specifically, a plurality of powders arranged to face different directions (powder having a function of reflecting light) can reflect light irradiated on the timepiece dial in various directions, It will have a high-grade appearance with a glossy (shiny) like diamond or cut glass. In addition, when a material that reflects light is simply arranged in a plane, the appearance differs significantly depending on the viewing direction (the visual angle dependency of the aesthetic appearance is large). In addition, by arranging the plurality of powders having the function of reflecting light to face in different directions by the different direction arrangement means, the viewing angle dependency of the timepiece dial can be reduced, and various directions, Even when observed from various angles, a stable and excellent aesthetic appearance can be exhibited.

Further, by providing the different direction arrangement means, the aesthetic appearance of the entire timepiece dial can be made sufficiently excellent, and the light transmittance of the entire timepiece dial can be made excellent. For this reason, the timepiece dial of the present invention can be suitably applied to a solar timepiece.
The different direction arrangement means may be any means as long as it has a function of causing the main surfaces of the plurality of powders 31 to face different directions, but in the present embodiment, the uneven surface 21 of the substrate 2 is used. is there. Thereby, the aesthetic appearance of the timepiece dial can be made easier and more reliable. Further, the adhesion between the substrate 2 and the dispersion layer 3 described later can be made particularly excellent, and the durability of the timepiece dial 1 can be made particularly excellent.

It is preferable that the uneven surface 21 serving as the different direction arrangement means has regularly provided unevenness. Thereby, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent.
Further, the different direction arrangement means may have any shape such as a substantially pyramid shape or a substantially conical shape, but preferably has a substantially conical shape. Thereby, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent.

The height difference of the uneven surface 21 is preferably 50 to 220 μm, and more preferably 70 to 180 μm. Thereby, the powder 31 can be efficiently directed in various directions, and the aesthetic appearance of the timepiece dial 1 can be made particularly excellent.
When the height difference of the uneven surface 21 is X [μm] and the average particle diameter of the powder 31 is Y [μm], it is preferable to satisfy the relationship of 0.3 ≦ X / Y ≦ 1.7, 0.5 It is more preferable that the relationship of ≦ X / Y ≦ 1.5 is satisfied. By satisfying such a relationship, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent.

Further, the shape and size of the substrate 2 are not particularly limited, and are usually determined based on the shape and size of the timepiece dial 1 to be manufactured. In the illustrated configuration, the substrate (base material) 2 has a flat plate shape, but may have a curved plate shape, for example.
Although the average thickness of the board | substrate 2 is not specifically limited, It is preferable that it is 150-700 micrometers, It is more preferable that it is 200-600 micrometers, It is further more preferable that it is 250-500 micrometers. When the average thickness of the substrate 2 is a value within the above range, when the timepiece dial 1 is applied to a solar timepiece, the light transmission of the timepiece dial 1 is sufficiently high, It is possible to more effectively prevent the self color from being seen through, and to make the aesthetic appearance (luxury feeling) particularly excellent. Further, when the thickness of the substrate 2 is within the above range, the timepiece to which the timepiece dial 1 is applied is effectively prevented from being thickened while the timepiece dial 1 is mechanically mechanical. Strength, shape stability, etc. can be made sufficiently excellent.
The substrate 2 may be formed by any method. Examples of the method for forming the substrate 2 include compression molding, extrusion molding, injection molding, and stereolithography.

[Dispersion layer]
On the uneven surface 21 of the substrate 2, a dispersion layer 3 is provided in which a plurality of scaly powders 31 having a function of reflecting light are dispersed in a dispersion medium 32.
In the present invention, the timepiece dial may be provided with different-direction arrangement means and a plurality of scale-like powders having a function of reflecting light. It is preferably dispersed in the dispersion layer 3. Thereby, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent. Moreover, the durability of the timepiece dial 1 can be improved.

The powder 31 is not particularly limited as long as it has a scaly shape, but it is particularly preferable that the powder 31 has a substantially rectangular parallelepiped shape. In other words, the powder 31 preferably has a substantially rectangular shape when viewed in plan. Thereby, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent.
The average particle size of the powder 31 is preferably 30 to 200 μm, more preferably 40 to 180 μm, and even more preferably 50 to 160 μm. When the average particle diameter of the powder 31 is a value within the above range, the aesthetic appearance of the timepiece dial can be made particularly excellent while the light transmittance is sufficiently excellent. Further, the durability of the timepiece dial 1 can be made particularly excellent. In the present invention, the particle size of the powder refers to the value of the diameter of a perfect circle having the same perimeter as the perimeter when the powder is viewed in plan. More specifically, when the shape of the powder in plan view is a square having a side of a [μm], the particle diameter of the powder is 4a / π [μm].

The average thickness of the powder 31 is preferably 10 to 30 μm, more preferably 12 to 28 μm, and still more preferably 14 to 26 μm. When the average thickness of the powder 31 is within the above range, the incident light can be reliably reflected in the powder 31 and the aesthetic appearance of the timepiece dial 1 can be made particularly excellent. .
In the present embodiment, the powder 31 is obtained by providing a metal thin film 312 on a plastic base 311. When the powder 31 has such a configuration, the powder 31 is preferably elastically deformed when the composition containing the powder 31 passes through the mesh of the screen plate in the manufacturing method described in detail later. It is possible to reliably prevent clogging of the screen plate mesh. And the powder 31 can be easily and reliably passed through the mesh of the screen plate, and the variation in the content of the powder 31 at each part of the composition applied onto the substrate 2 can be suppressed. Therefore, it is possible to improve the aesthetic appearance of the timepiece dial 1 obtained while improving the productivity of the timepiece dial 1. In particular, in the present embodiment, the powder 31 is obtained by providing the metal thin film 312 on both surfaces of the plastic base 311. Thereby, in the manufacturing method described in detail later, when the composition passes through the mesh of the screen plate, the powder 31 can be more preferably elastically deformed, and the screen plate mesh may be clogged. More reliably prevented. Further, since the powder 31 has the above-described configuration, the powder 31 is reliably prevented from being deformed even when the temperature of the timepiece dial 1 is changed. As a result, in the timepiece dial 1, it is possible to reliably prevent the adhesion between the powder 31 and the dispersion medium 32 and the adhesion between the substrate 2 and the dispersion layer 3 from being lowered due to a temperature change. The durability and reliability of the dial 1 can be made particularly excellent.

  Examples of the plastic material constituting the base 311 include various thermoplastic resins and various thermosetting resins. Examples thereof include polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS resin), and polymethyl methacrylate. Acrylic resins such as (PMMA), polyolefin resins such as polyethylene (PE) and polypropylene (PP), polyester resins such as polyethylene terephthalate (PET), and copolymers, blends, and polymers mainly containing these resins Alloys and the like can be mentioned, and one or more of these can be used in combination (for example, as a blend resin, polymer alloy, laminate, etc.), but the base 311 is made of a polyester resin. Is preferred. Thereby, the aesthetic appearance of the timepiece dial 1 obtained can be made particularly excellent while the productivity of the timepiece dial 1 is particularly excellent.

The average thickness of the base 311 is preferably 7 to 29.9 μm, and more preferably 10 to 27.8 μm. Thereby, the aesthetic appearance and light transmittance of the timepiece dial 1 can be made particularly excellent while the productivity of the timepiece dial 1 is made particularly excellent.
Examples of the metal material constituting the metal thin film 312 include Fe, Cu, Zn, Ni, Mg, Cr, Mn, Mo, Nb, Al, V, Zr, Sn, Au, Pd, Pt, Ag, and the like. Among them, an alloy containing at least one kind (for example, bronze, brass, white or the like) can be mentioned, among which Cu, Al, Au, Pt, and Ag are preferable. Thereby, the aesthetic appearance of the timepiece dial 1 to be manufactured can be made particularly excellent.

  The average thickness of the metal thin film 312 is preferably 0.01 to 3.0 μm, and more preferably 0.02 to 2.0 μm. When the average thickness of the metal thin film 312 is a value within the above range, the metal material constituting the metal thin film 312 in the powder 31 while effectively preventing the thickness of the base 311 from becoming relatively thin. The texture of can be fully demonstrated. Thereby, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent while the productivity of the timepiece dial 1 is made particularly excellent. Further, the light transmission of the timepiece dial 1 can be made particularly excellent.

The powder 31 as described above is preferably produced as follows. That is, the powder 31 is formed on a plastic layer (sheet having a thickness corresponding to the thickness of the base 311) by a vapor phase film formation method such as vacuum deposition, sputtering, or ion plating. A metal layer corresponding to the thickness of the thin film 312 is formed, and then cut into a predetermined size (a size corresponding to the average particle diameter of the powder 31). Thereby, the powder 31 which is excellent in the adhesiveness between the base 311 and the metal thin film 312 and excellent in aesthetic appearance can be obtained easily and reliably.
In the configuration shown in the drawing, the metal thin film 312 is provided on both surfaces (main surfaces) of the base 311, but the metal thin film 312 may be provided only on one surface of the base 311.

The content of the powder 31 in the dispersion layer 3 is preferably 5 to 40 vol%, more preferably 7 to 35 vol%, and further preferably 10 to 33 vol%. When the content of the powder 31 in the dispersion layer 3 is a value within the above range, the aesthetic appearance of the timepiece dial 1 is particularly excellent while the light transmittance is sufficiently excellent. it can. Further, the adhesion of the dispersion layer 3 to the substrate 2 can be made particularly excellent.
The dispersion medium 32 constituting the dispersion layer 3 is solid and has a function of preventing the plurality of powders 31 from aggregating.

The dispersion medium 32 may be made of any material, but is preferably made of a light transmissive material. Thereby, with the outstanding aesthetic appearance of the timepiece dial 1, it can be suitably applied to a solar timepiece dial (a dial provided in a timepiece equipped with a solar cell) that effectively uses excellent light transmittance. .
The dispersion medium 32 is preferably made of a resin material, and more preferably made of a cured product of a curable resin. Thereby, the adhesiveness of the dispersion layer 3 to the substrate 2 can be made particularly excellent, and the durability of the timepiece dial 1 can be made particularly excellent.

When the refractive index of the dispersion medium 32 constituting the dispersion layer 3 is n _M and the refractive index of the constituent material of the substrate is n _B , it is preferable that the relationship | n _M −n _B | ≦ 0.18 is satisfied. , | N _M −n _B | ≦ 0.07 is more preferable. By satisfying such a relationship, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent.
The average thickness of the dispersion layer 3 is preferably 25 to 500 μm, more preferably 30 to 400 μm, and still more preferably 40 to 350 μm.
The light transmittance of the timepiece dial 1 is preferably 20% or more, more preferably 30% or more, and even more preferably 35% or more. Thereby, the timepiece dial can be suitably applied to a solar timepiece.

(Second Embodiment)
FIG. 2 is a cross-sectional view showing a second embodiment of the timepiece dial of the present invention.
Hereinafter, the timepiece dial of the second embodiment will be described with a focus on differences from the above-described embodiment, and description of similar matters will be omitted.
As shown in FIG. 2, the timepiece dial 1 according to the present embodiment includes a substrate 2, a different-direction arrangement member (different-direction arrangement means) 4 provided on the substrate 2, and a plurality of functions that reflect light. And a dispersion layer 3 in which a scaly powder (glossy powder) 31 is dispersed. That is, in the above-described embodiment, the different direction arrangement means forms a part of the substrate, whereas in this embodiment, the different direction arrangement means is provided separately from the substrate (different Direction arrangement member). Thus, by providing the different direction arrangement member as the different direction arrangement means as a separate body from the substrate, the amount of the different direction arrangement member supplied on the substrate, the size of the different direction arrangement member, and the like can be selected. Thus, it is possible to easily widen the variety of aesthetic appearances of the timepiece dial, and it is possible to suitably cope with multi-item production.

[Different orientation member]
The different-direction arrangement member 4 may have any shape, and for example, a substantially spherical shape, a substantially cylindrical shape, a substantially prismatic shape, a sheet-like shape made of a fiber, and the like can be used. It preferably has a substantially spherical shape or a substantially cylindrical shape. Thereby, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent.

The height of the different-direction arrangement member 4 (when the different-direction arrangement member 4 has a substantially spherical shape or a substantially cylindrical shape, the diameter) is preferably 50 to 220 μm, and preferably 70 to 180 μm. Is more preferred. When the height of the different direction arrangement member 4 is a value within the above range, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent.
It is preferable that the relationship of 0.3 ≦ X / Y ≦ 1.7 is satisfied, where X is the height of the differently arranged member 4 and X is the average particle size of the powder 31, and 0 It is more preferable that the relationship of 5 ≦ X / Y ≦ 1.5 is satisfied. By satisfying such a relationship, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent.

Although the different direction arrangement | positioning member 4 may be comprised with what kind of material, it is preferable that it is comprised with the material which has a light transmittance. Thereby, with the outstanding aesthetic appearance of the timepiece dial 1, it can be suitably applied to a solar timepiece dial (a dial provided in a timepiece equipped with a solar cell) that effectively uses excellent light transmittance. .
For example, various plastic materials, various glass materials, and the like can be used as the constituent material of the different-direction disposing member 4. The substrate 2 is preferably mainly composed of a plastic material. The plastic material is generally excellent in moldability (molding freedom), and can be suitably applied to the manufacture of the differently arranged members 4 having various shapes. Moreover, it is advantageous for the manufacturing cost reduction of the timepiece dial 1 that the different direction arrangement | positioning member 4 is comprised by the plastic material. In addition, since plastic materials are generally excellent in light (visible light) transmission and also in radio wave transmission, the timepiece dial 1 is assumed that the substrate 2 is made of a plastic material. Can be suitably applied to a radio timepiece as described later.

Examples of the plastic material constituting the different-direction arrangement member 4 include various thermoplastic resins, various thermosetting resins, and the like, for example, polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS resin), polymethyl, and the like. Acrylic resins such as methacrylate (PMMA), polyolefin resins such as polyethylene (PE) and polypropylene (PP), polyester resins such as polyethylene terephthalate (PET), etc., or copolymers and blends mainly containing these resins, A polymer alloy etc. are mentioned, It can be used combining 1 type (s) or 2 or more types of these (for example, as a blend resin, a polymer alloy, a laminated body, etc.). In particular, the substrate 2 is preferably composed mainly of polycarbonate and / or acrylonitrile-butadiene-styrene copolymer. Thereby, especially the intensity | strength as the timepiece dial 1 whole can be made excellent. Moreover, since the freedom degree of shaping | molding of the board | substrate 2 increases (easiness of shaping | molding improves), even if it is the different direction arrangement | positioning member 4 of a more complicated shape, it can manufacture 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 the durability of the timepiece dial 1 as a whole can be further improved.
Further, when the refractive index of the constituent material of the different direction arrangement member 4 is n _O and the refractive index of the constituent material of the substrate 2 is n _B , the relationship of | n _O −n _B | ≦ 0.18 is satisfied. Preferably, it is more preferable to satisfy the relationship of | n _O −n _B | ≦ 0.07. By satisfying such a relationship, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent.

<Manufacturing method of timepiece dial>
(First embodiment)
Next, a method for manufacturing the timepiece dial 1 of the first embodiment described above will be described.
FIG. 3 is a cross-sectional view showing a first embodiment of a timepiece dial manufacturing method according to the present invention.
The manufacturing method according to the present embodiment includes a substrate preparation step (1a) for preparing the substrate 2 having the uneven surface 21, and a composition that provides a composition containing the powder 31 and the curable resin on the uneven surface 21 of the substrate 2. A product applying step (1b) and a dispersion layer forming step (1c) in which the curable resin is cured to form a solid dispersion medium 32 and the dispersion layer 3 is formed.

[Board preparation process]
First, a substrate 2 having an uneven surface 21 is prepared (1a).
As the substrate 2, those described above can be used.
In addition, various cleaning processes may be performed on the surface of the substrate 2 prior to a process described later. Thereby, for example, the adhesion between the substrate 2 and the dispersion layer 3 can be made particularly excellent.

[Composition applying step]
Next, the composition containing the powder 31 and the curable resin is applied to the uneven surface 21 side of the substrate 2 (1b).
The powder 31 in the composition applied in this step is oriented so as to correspond to the uneven surface (different direction arrangement means) 21 of the substrate 2. Thereby, the timepiece dial plate 1 finally obtained is arranged such that the main surfaces of the numerous powders 31 contained in the dispersion layer 3 face different directions.

  The method for applying the composition is not particularly limited, and examples thereof include a screen printing method, an octopus printing method, an ink jet method, a spin coating method, and a brush coating method. In particular, by using the screen printing method, the main surface of the plurality of powders 31 arranged on the substrate 2 is directed in different directions more reliably while improving the productivity of the timepiece dial 1. Can be. In addition, when the dispersion layer 3 is formed in a predetermined pattern on the substrate 2, the dispersion layer 3 having a desired shape and pattern can be easily and reliably formed. In addition, when manufacturing a plurality of timepiece dials 1, the composition can be repeatedly applied in a predetermined pattern while preventing variation among individuals, so that the watch has excellent quality stability. The dial 1 can be suitably applied to mass production.

In the present embodiment, a case where the composition applying step is performed using a screen printing method will be described as a representative example.
Screen printing is performed by pressing the upper surface of the screen plate with a squeegee in a state where the composition is arranged on the screen plate having a mesh made of wires.
In this step, the composition applied onto the substrate 2 includes the powder 31 and a curable resin.

  In the present embodiment, the powder 31 is obtained by providing a metal thin film 312 on a plastic base 311. When the powder 31 has such a structure, when the composition passes through the screen plate mesh, the powder 31 can be suitably elastically deformed, and the screen plate mesh may be clogged. It is surely prevented. And the powder 31 can be easily and reliably passed through the mesh of the screen plate, and the variation in the content of the powder 31 in each part of the composition applied onto the substrate 2 can be suppressed. Therefore, it is possible to improve the aesthetic appearance of the timepiece dial 1 obtained while improving the productivity of the timepiece dial 1. In particular, in this embodiment, the powder 31 is obtained by providing a metal thin film 312 on both surfaces of a plastic base 311. Thereby, when the composition passes through the mesh of the screen plate, the powder 31 can be more suitably elastically deformed, and the screen plate mesh is more reliably prevented from being clogged. Further, since the powder 31 has the above-described configuration, the thermal expansion coefficient of the constituent material of the base 311 and the thermal expansion coefficient of the constituent material of the metal thin film 312 are obtained in the manufacturing process of the timepiece dial 1. Due to the difference, it is possible to reliably prevent the powder 31 from warping. As a result, the aesthetic appearance of the manufactured timepiece dial 1 can be reliably improved. Further, even when the temperature of the timepiece dial 1 is changed, the powder 31 is reliably prevented from being deformed. As a result, in the timepiece dial 1, due to temperature change, the adhesion between the powder 31 and the dispersion medium 32 formed of the curable resin is reduced, or the adhesion between the substrate 2 and the dispersion layer 3 is reduced. Is reliably prevented, and the durability and reliability of the timepiece dial 1 can be made particularly excellent.

The curable resin is in an uncured or semi-cured state.
As the curable resin, a resin material that is cured by energy rays (for example, heat (heat rays), light (including light other than visible light such as ultraviolet rays), electron beams) can be used. , A photo-curable resin, an electron beam curable resin, or the like can be used. When a photocurable resin is used as the curable resin, the productivity of the timepiece dial 1 can be made particularly excellent. Further, deterioration of the constituent material of the timepiece dial 1 at the time of manufacture can be prevented more reliably, and the reliability of the manufactured timepiece dial 1 can be made particularly excellent.

The composition may contain components other than the powder 31 and the curable resin described above. Examples of such components include various solvents (dispersing medium that disperses (solid / liquid dispersion) the powder 31 and functions as a solvent that dissolves the curable resin), a dispersant, a thermoplastic resin, and the like.
And it is preferable that the viscosity in 25 degreeC of the composition containing the powder 31 and curable resin is 8000-20000 cps. When the viscosity of the composition is within the above range, the composition containing the relatively large powder 31 (relatively large powder 31 with respect to the mesh roughness of the screen plate) as described above is applied to the screen mesh. When passing through, the powder 31 can be suitably elastically deformed to prevent clogging or deterioration of the dispersion state of the powder 31 in the composition. On the other hand, when the viscosity of the composition is too small, it is difficult to elastically deform the powder 31, and clogging of the powder 31 into the mesh is likely to occur. Moreover, when the viscosity of a composition is too large, the efficiency (workability) of screen printing will fall remarkably, and it will become difficult to produce the elastic deformation of the above powders 31. FIG. As a result, the productivity of the timepiece dial 1 may be lowered and the aesthetic appearance of the manufactured timepiece dial 1 may be caused. As described above, the viscosity at 25 ° C. of the composition containing the powder 31 and the curable resin is preferably 8000 to 20000 cps, more preferably 12000 to 19000 cps, and further preferably 15000 to 18000 cps. preferable. Thereby, the effects as described above are more remarkably exhibited.

In this step, a screen plate having a mesh made of wire is used. Thereby, it is comprised so that a composition may be supplied on the board | substrate 2 from the clearance gap between wires.
The screen plate used in this step is provided with a wire at least near the surface made of polytetrafluoroethylene, the mesh roughness is 20 to 120, and the wire diameter is 50 to 120 μm. Is preferred. Thereby, while making the printing speed of screen printing excellent, when the powder 31 passes through the mesh of the screen plate, the powder 31 can be suitably elastically deformed, and after passing through the mesh, the shape is changed. It can be restored quickly. As a result, in the timepiece dial 1 to be manufactured, light can be effectively reflected by the powder 31, and the aesthetic appearance of the timepiece dial 1 can be made excellent.

As described above, the screen plate used in this step is preferably provided with a wire at least near the surface made of polytetrafluoroethylene, but the entire wire is made of polytetrafluoroethylene. More preferably. Thereby, the effects as described above are more remarkably exhibited.
As described above, the mesh roughness of the screen plate used in this step is preferably 20 to 120, more preferably 30 to 100, and even more preferably 50 to 70. preferable. Thereby, the effects as described above are more remarkably exhibited.
Further, as described above, the diameter of the wire constituting the screen plate used in this step is preferably 50 to 120 μm, more preferably 50 to 90 μm, and further preferably 60 to 70 μm. . Thereby, the effects as described above are more remarkably exhibited.

As a constituent material of the squeegee, for example, urethane rubber, silicone rubber, various synthetic rubbers, various metals and the like can be used, and among them, urethane rubber is preferable.
As described above, by performing screen printing under a predetermined condition using a composition that satisfies the predetermined condition, screen printing can be efficiently performed, and the composition passes through the mesh of the screen plate. At this time, the powder 31 can be suitably elastically deformed, and its shape can be quickly restored after passing through the mesh, and the powder 31 can be preferably oriented in the formed dispersion layer 3. As a result, it is possible to obtain the timepiece dial 1 having a particularly excellent aesthetic appearance while improving the productivity of the timepiece dial 1.

[Dispersed layer forming step]
Next, the curable resin constituting the composition is cured to form a dispersion layer 3 in which a large number of powders 31 are dispersed (solid / solid dispersion) in a solid dispersion medium 32 (1c). Thereby, the timepiece dial 1 is obtained. Since the dispersion layer 3 formed in this way is such that the main surfaces of the plurality of powders 31 face different directions, the resulting timepiece dial 1 is excellent in aesthetic appearance. Further, since the dispersion layer 3 is manufactured using a composition in which the powder 31 is dispersed, the powder 31 is securely fixed to the dispersion medium (curing portion) 32, and the use of the timepiece dial 1 is used. Sometimes the powder 31 is effectively prevented from falling off. Therefore, the timepiece dial 1 is excellent in durability and reliability.
Curing of the curable resin is performed by a method according to the type of the curable resin. For example, when the curable resin is a thermosetting resin, it is performed by heating, and when the curable resin is a photocurable resin, it is performed by irradiation with light (energy rays).

(Second Embodiment)
Next, a method for manufacturing the timepiece dial 1 of the second embodiment described above will be described.
FIG. 4 is a sectional view showing a second embodiment of the method for manufacturing a timepiece dial according to the invention.
Hereinafter, the manufacturing method of the timepiece dial according to the second embodiment will be described with a focus on differences from the above-described embodiment, and description of similar matters will be omitted.

  The manufacturing method of this embodiment includes a substrate preparation step (2a) for preparing the substrate 2, a different direction arrangement member arrangement step (2b) for arranging the different direction arrangement member 4 on the substrate 2, and a different direction of the substrate 2. The composition applying step (2c) for applying a composition containing the powder 31 and the curable resin on the surface side to which the arrangement member 4 is applied, the curable resin is cured to form a solid dispersion medium 32, and the dispersion layer 3 And a dispersion layer forming step (2d).

That is, in the manufacturing method of the present embodiment, after the substrate 2 is once prepared, the different-direction arrangement member 4 separate from the substrate 2 is applied, and the powder is applied to the surface side of the substrate 2 to which the different-direction arrangement member 4 is applied. It is the same as that of embodiment mentioned above except providing the composition containing 31. As described above, by using the different-direction arrangement member 4 separate from the substrate 2 as the different-direction arrangement means, the amount of the different-direction arrangement member 4 supplied on the substrate 2, the type and size of the different-direction arrangement member 4 are large. By selecting the size and the like, it is possible to easily widen the variety of aesthetic appearances of the timepiece dial 1, and it is possible to suitably cope with multi-item production. Further, in the case of manufacturing a plurality of timepiece dials 1, by adjusting and changing the amount, type, etc. of the different-direction arrangement member 4 while confirming the appearance of the previously manufactured timepiece dial 1. Further, the timepiece dial 1 of higher quality can be manufactured while the productivity of the timepiece dial 1 is sufficiently high.
In the different direction arrangement member arrangement step, for example, the different direction arrangement member 4 may be provided alone on the substrate 2 or a dispersion liquid in which the different direction arrangement member 4 is dispersed may be provided on the substrate 2. .

<Clock>
Next, an example of the timepiece of the present invention provided with the timepiece dial 1 of the present invention as described above, particularly an example of a solar timepiece will be described.
The timepiece of the present invention has the timepiece dial of the present invention as described above. As described above, the timepiece dial of the present invention is excellent in decorativeness (aesthetic appearance). The timepiece dial is a member that has a particularly great influence on the appearance of the entire timepiece among various members constituting the timepiece. For this reason, the timepiece provided with the timepiece dial as described above has an excellent aesthetic appearance as a whole. Further, as described above, the timepiece dial of the present invention is excellent in light transmittance. For this reason, the timepiece of the present invention provided with the timepiece dial as described above can sufficiently satisfy the required requirements as a solar timepiece. As a part other than the timepiece dial (the timepiece dial of the present invention) that constitutes the timepiece of the present invention, known parts can be used, but an example of the configuration of the timepiece of the present invention is described below. explain.

FIG. 5 is a cross-sectional view showing a preferred embodiment of the timepiece (watch) of the present invention.
As shown in FIG. 5, a wristwatch (portable watch) 100 as a solar watch of this embodiment includes a trunk (case) 82, a back cover 83, a bezel (edge) 84, a glass plate (cover glass) 85, and the like. It has. Further, in the case 82, the timepiece dial 1 of the present invention as described above, the solar cell 94, and the movement 81 are accommodated, and further, hands (pointers) not shown are accommodated. . The timepiece dial 1 is provided between a solar cell 94 and a glass plate (cover glass) 85.

The glass plate 85 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 94.
The movement 81 uses the electromotive force of the solar cell 94 to drive the pointer.
Although omitted in FIG. 5, in the movement 81, for example, an electric double layer capacitor for storing the electromotive force of the solar cell 94, a lithium ion secondary battery, a crystal oscillator as a time reference source, and a crystal vibration A semiconductor integrated circuit that generates a driving pulse for driving a clock based on the oscillation frequency of the child, a step motor that drives the pointer every second in response to this driving pulse, and a wheel that transmits the movement of the step motor to the pointer A row mechanism is provided.
The movement 81 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 94 has a function of converting light energy into electric energy. The electric energy converted by the solar cell 94 is used for driving the movement.
In the solar cell 94, 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 86 is fitted into and fixed to the barrel 82, and a shaft 871 of a crown 87 is rotatably inserted into the winding stem pipe 86.
The body 82 and the bezel 84 are fixed by a plastic packing 88, and the bezel 84 and the glass plate 85 are fixed by a plastic packing 89.
Further, a back cover 83 is fitted (or screwed) to the body 82, and a ring-shaped rubber packing (back cover packing) 92 is inserted in a compressed state in these joint portions (seal portions) 93. Has been. With this configuration, the seal portion 93 is sealed in a liquid-tight manner, and a waterproof function is obtained.

  A groove 872 is formed on the outer periphery of the middle portion of the shaft portion 871 of the crown 87, and a ring-shaped rubber packing (crown packing) 91 is fitted in the groove 872. The rubber packing 91 is in close contact with the inner peripheral surface of the winding stem pipe 86 and is compressed between the inner peripheral surface and the inner surface of the groove 872. With this configuration, the space between the crown 87 and the winding stem pipe 86 is liquid-tightly sealed, and a waterproof function is obtained. When the crown 87 is rotated, the rubber packing 91 rotates together with the shaft portion 871 and slides in the circumferential direction while being in close contact with the inner peripheral surface of the winding stem pipe 86.

The portable watch (watch) as described above is required to have particularly excellent durability (for example, impact resistance) among various watches. For this reason, the timepiece dial 1 capable of obtaining excellent durability as well as excellent aesthetic appearance can be more suitably applied.
In the above description, a wristwatch (portable clock) as a solar radio timepiece has been described as an example of a clock. However, the present invention is applicable to other types of clocks such as a portable clock, a table clock, and a wall clock other than a wristwatch. Can be applied similarly. The present invention can also be applied to solar timepieces other than solar radio timepieces.

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 not limited to those manufactured using the method described above.
Moreover, when manufacturing the timepiece dial of the present invention, steps other than those described above may be provided. For example, a step of forming a coat layer may be provided. As a result, for example, the color tone, etc., can be adjusted to further improve the aesthetic appearance of the timepiece dial, or the weather face, water resistance, oil resistance, scratch resistance, abrasion resistance of the timepiece dial as a whole Various properties such as discoloration resistance can be improved. Such a coat layer may be removed, for example, when a timepiece dial is used.

In the embodiment of the manufacturing method described above, the case where a substrate 2 having a shape and size corresponding to the timepiece dial 1 is used as the substrate 2 on which the dispersion layer 3 is formed has been mainly described. After forming the dispersion layer on the shaped member, the sheet-like member may be processed into a timepiece dial by stamping or the like.
In the embodiment of the manufacturing method described above, the case where the dispersion layer 3 has a configuration in which the powder 31 is dispersed in the cured product of the curable resin has been representatively described. Instead of the curable resin, for example, a thermoplastic resin or a glass material may be included.

In the above-described embodiment, the configuration in which the different direction arrangement means and the powder are provided on one surface side of the substrate is representatively described. However, the timepiece dial of the present invention is, for example, on both surfaces of the substrate. Different direction arrangement means and powder may be provided.
In the above-described embodiment, the case where the dispersion layer 3 is provided on the entire surface of the substrate 2 has been mainly described. However, the dispersion layer 3 is a part of the substrate 2 (for example, a part corresponding to an index such as a time character). ) May be provided only in this case. When the timepiece dial is composed of the different-direction arrangement means and powder as described above, it is more stable against impacts and the like than the case where a planting material called a typesetting is attached and fixed. (Fixing force) is excellent.

Next, specific examples of the present invention will be described.
1. Manufacture of timepiece dial (Example 1)
A watch dial (solar watch dial) was manufactured by the following method.
First, a base material having the shape of a watch dial (solar watch dial) is produced by injection molding using polycarbonate, and then a necessary portion is cut out and unnecessary burrs are cut and polished. As a result, a substrate was obtained. The obtained substrate was substantially disc-shaped and had a diameter: 27 mm × thickness: 300 μm. In addition, the obtained substrate has, on one main surface, a large number of conical convex portions (different direction arrangement means) having a height: 150 [μm] and a bottom area: 150 × 150 × π [μm ² ], When the substrate was viewed in plan, it was arranged in a honeycomb shape (in a pattern in which a large number of equilateral triangles were arranged in succession, the center of the bottom of the cone was located at the apex of each equilateral triangle). . The pitch of adjacent convex portions was 300 μm.

Next, this substrate was cleaned. The substrate was first washed with a neutral plastic detergent for 30 seconds, then neutralized for 10 seconds, washed with water for 30 seconds, and washed with pure water for 60 seconds. Then, it dried for 20 minutes in oven (80 degreeC).
A composition containing glossy powder and an uncured curable resin (ultraviolet curable resin) is applied by screen printing to the uneven surface (surface having different direction arrangement means) of the substrate thus cleaned. (Composition applying step). As a glossy powder constituting the composition, a metal layer composed of Al is formed on both surfaces of a sheet material (average thickness: 20 μm) composed of a polyester resin (PET) by vacuum deposition, and then A sheet material cut into a square shape was used. The average particle size of the glossy powder was 127 μm. In addition, the average thickness of the metal layers (metal thin films) provided on both surfaces of the sheet material made of the polyester resin was 0.5 μm. Moreover, all the Al content rates in the metal layer (metal thin film) provided on both surfaces of the sheet | seat material comprised with the polyester resin were 99.9 wt% or more. The viscosity of the composition used in this step at 25 ° C. was 17000 cps. As the screen plate, a screen plate having a mesh made of polytetrafluoroethylene wire, having a mesh roughness of No. 70 and a wire diameter of 60 μm was used. Moreover, as a squeegee, what was comprised with the urethane type rubber was used.

Next, the curable resin is cured by irradiating ultraviolet rays from the surface (uneven surface) side to which the composition of the substrate is applied, and a dispersed layer in which the glossy powder is dispersed in the cured product of the curable resin Formed (dispersion layer forming step). As a result, a watch dial (solar watch dial) as shown in FIG. 1 was obtained. The average thickness of the formed dispersion layer was 200 μm. In the timepiece dial manufactured as described above, the plurality of powders contained in the dispersion layer faced different directions.
In addition, the thickness of the substrate, the dispersion layer, the glossy powder, and the like were measured according to a microscope cross-sectional test method defined in JIS H 5821.

(Examples 2 to 6)
A watch dial (solar watch dial) was manufactured in the same manner as in Example 1 except that the configuration shown in Table 1 was adopted.
(Example 7)
A watch dial (solar watch dial) was manufactured by the following method.
First, a base material having the shape of a watch dial (solar watch dial) is produced by injection molding using polycarbonate, and then a necessary portion is cut out and unnecessary burrs are cut and polished. As a result, a substrate was obtained. The obtained substrate was substantially disc-shaped and had a diameter: 27 mm × thickness: 300 μm. Further, the obtained substrate had sufficiently smooth main surfaces on both sides (surface roughness Ra was 0.1 μm or less).

Next, this substrate was cleaned. The substrate was first washed with a neutral plastic detergent for 30 seconds, then neutralized for 10 seconds, washed with water for 30 seconds, and washed with pure water for 60 seconds. Then, it dried for 20 minutes in oven (80 degreeC).
In this way, the unidirectionally arranged member made of polycarbonate having a spherical shape with a diameter of 100 μm is arranged on the entire main surface of one of the substrates cleaned (the unidirectionally arranged member arranging step). ).

  Next, a composition containing a glossy powder and an uncured curable resin (ultraviolet curable resin) was applied by screen printing to the surface of the substrate on which the different direction arrangement member was applied (composition application) Process). As a glossy powder constituting the composition, a metal layer composed of Al is formed on both surfaces of a sheet material (average thickness: 20 μm) composed of a polyester resin (PET) by vacuum deposition, and then A sheet material cut into a square shape was used. The average particle size of the glossy powder was 127 μm. In addition, the average thickness of the metal layers (metal thin films) provided on both surfaces of the sheet material made of the polyester resin was 0.5 μm. Moreover, all the Al content rates in the metal layer (metal thin film) provided on both surfaces of the sheet | seat material comprised with the polyester resin were 99.9 wt% or more. The viscosity of the composition used in this step at 25 ° C. was 17000 cps. As the screen plate, a screen plate having a mesh made of polytetrafluoroethylene wire, having a mesh roughness of No. 70 and a wire diameter of 60 μm was used. Moreover, as a squeegee, what was comprised with the urethane type rubber was used.

  Next, the curable resin is cured by irradiating ultraviolet rays from the surface (uneven surface) side to which the composition of the substrate is applied, and a dispersed layer in which the glossy powder is dispersed in the cured product of the curable resin Formed (dispersion layer forming step). As a result, a watch dial (solar watch dial) as shown in FIG. 1 was obtained. The average thickness of the formed dispersion layer was 200 μm. In the timepiece dial manufactured as described above, the plurality of powders contained in the dispersion layer faced different directions.

(Examples 8 to 12)
A watch dial (solar watch dial) was manufactured in the same manner as in Example 7 except that the configuration shown in Table 1 was adopted.

(Comparative Example 1)
A watch dial (solar watch dial) was manufactured in the same manner as in Example 7 except that the different direction placement member placement step was omitted.
The substrates used in the above examples and comparative examples each have a visible light transmittance of 80 when a white fluorescent lamp (manufactured by Toshiba, fluorescent lamp FL20S-D65) is used as the light source. % Or more.

Table 1 summarizes the configuration and the like of the watch dial (solar watch dial) of each example and comparative example. In the table, polycarbonate is PC, acrylonitrile-butadiene-styrene copolymer (ABS resin) is ABS, polyethylene terephthalate is PET, and acrylic resin is PMMA. In addition, the refractive index of the dispersion medium of the dispersion layer is represented by n _M , the refractive index of the constituent material of the substrate is represented by n _B , and the refractive index of the constituent material of the different direction arrangement member is represented by n _O. In addition, as for the means having the uneven surface of the substrate as the different direction arranging means, the height difference of the uneven surface is indicated by X [μm], and the means having the different direction arranging member (separate from the substrate) as the different direction arranging means Indicates the height of the differently arranged member by X [μm], and the average particle size of the powder (glossy powder) by Y [μm]. Moreover, the content rate of the material shown in Table 1 in each site | part of the timepiece dial was all 99 wt% or more.

2. Appearance evaluation of watch dial (solar watch dial) For each watch dial produced in each of the examples and comparative examples, the surface on the side where the dispersion layer of the substrate was provided on the black solar cell was In this state, visual observation was performed from the side of the substrate on which the dispersion layer was provided, and the appearance was evaluated according to the following seven criteria. The visual observation was performed from the normal direction of the substrate (direction of viewing angle 0 °) and the direction inclined by 70 ° from the normal line of the substrate (direction of viewing angle 70 °), and each direction was evaluated.

A: It has an extremely excellent appearance.
B: It has a very excellent appearance.
C: It has an excellent appearance.
D: It has a good appearance.
E: Appearance is slightly poor.
F: Appearance is poor.
G: The appearance is extremely poor.

3. Viewing angle dependency of appearance of watch dial plate (solar watch dial plate) First, for each watch dial plate manufactured in each of the examples and comparative examples, a dispersion layer of a substrate is provided on a black solar cell. It was arranged so that the surfaces on the opposite side face each other. In such a state, the brightness L ₀ [cd / m ² ] in the normal direction (direction of viewing angle 0 °) of the substrate on the surface side where the dispersion layer of the substrate is provided is inclined by 70 ° from the normal of the substrate. The luminance L ₇₀ [cd / m ² ] in the measured direction (direction of viewing angle 70 °) was measured, and the viewing angle dependency of the appearance of the timepiece dial was evaluated according to the following five-stage criteria.

_{A: L} 70 / L ₀ is 0.90 or more.
_{B: L} 70 / L ₀ is less than 0.85 to 0.90.
C: L ₇₀ / L ₀ is 0.80 or more and less than 0.85.
D: L ₇₀ / L ₀ is 0.70 or more and less than 0.80.
_{E: L} 70 / L ₀ is less than 0.70.

4). Evaluation of Light Transmittance of Watch Dial (Solar Watch Dial) The light transmittance of each watch dial manufactured in each of the above Examples and Comparative Examples was evaluated by the following method.
First, the solar cell and each watch dial were placed in a darkroom. Thereafter, light from a white 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 white fluorescent lamp (light source) separated by a predetermined distance as described above was made incident on the upper surface of the light receiving surface of the solar cell with a wristwatch dial overlapped. In this state, the generated current of the solar cell was B [mA]. Then, the light transmittance of the timepiece dial represented by (B / A) × 100 was calculated and evaluated according to the following five criteria. It can be said that the larger the light transmittance, the better the light transmittance of the timepiece dial. The timepiece dial was superimposed on the solar cell so that the surface of the substrate on which the dispersion layer was provided faced the white fluorescent lamp (light source). Further, as the white fluorescent lamp, a white fluorescent lamp (manufactured by Toshiba, fluorescent lamp for inspection FL20S-D65) was used.

A: 32% or more.
B: 26% or more and less than 32%.
C: 20% or more and less than 26%.
D: 15% or more and less than 20%.
E: Less than 15%.

5). Evaluation of radio wave permeability The radio wave permeability of each timepiece dial manufactured in each of the above Examples and Comparative Examples was evaluated by the following method.
First, a watch case and a wristwatch internal module (movement) equipped with an antenna for receiving radio waves were prepared.
Next, a wristwatch internal module (movement) and a wristwatch dial were assembled in the watch case, and the radio wave reception sensitivity in this state was measured. At this time, the timepiece dial was such that the surface of the substrate on which the dispersion layer was provided faced the outer surface.

Based on the reception sensitivity in a state where the wristwatch dial is not incorporated, the reduction amount (dB) of the reception sensitivity when the wristwatch dial is incorporated was evaluated according to the following four criteria. It can be said that the lower the radio wave reception sensitivity is, the better the radio wave transmission of the wristwatch dial is.
A: No decrease in sensitivity is observed (below the detection limit).
B: A decrease in sensitivity is observed at less than 0.7 dB.
C: The decrease in sensitivity is 0.7 dB or more and less than 1.0 dB.
D: The decrease in sensitivity is 1.0 dB or more.

6). Durability Evaluation Each watch dial plate manufactured in each of the above Examples and Comparative Examples was subjected to a thermal cycle test as shown below to evaluate durability.
First, the wristwatch dial is placed in a 15 ° C. environment for 1 hour, then in a 70 ° C. environment for 2 hours, then in a 15 ° C. environment for 1 hour, and then in a −25 ° C. environment for 2 hours. Left to stand. Thereafter, the environmental temperature was returned again to 15 ° C., which was set as one cycle (6 hours), and this cycle was repeated a total of 4 times (total 24 hours).
Thereafter, the appearance of the watch dial was visually observed, and the appearance was evaluated according to the following four criteria.

A: Dispersion layer, powder floating, peeling, etc. are not recognized at all.
B: The dispersion layer and powder floating are hardly observed.
C: Dispersion layer, powder floating is clearly recognized.
D: Dispersion layer, powder cracking and peeling are clearly recognized.
These results are shown in Table 2.

As is clear from Table 2, all of the timepiece dials of the present invention have an excellent aesthetic appearance, small visual angle dependency, and an excellent aesthetic appearance even when observed from various directions and angles. It was presented. Moreover, the timepiece dial of the present invention was excellent in light transmittance. Further, the timepiece dial of the present invention was excellent in durability. In addition, the timepiece dial of the present invention was excellent in radio wave permeability. In the present invention, a timepiece dial can be manufactured with excellent productivity.
On the other hand, in the comparative example, a satisfactory result was not obtained.
Further, a timepiece (solar timepiece) as shown in FIG. 5 was assembled using the timepiece dials obtained in the examples and comparative examples. Each timepiece thus obtained was tested and evaluated in the same manner as described above, and the same results as described above were obtained.

It is sectional drawing which shows 1st Embodiment of the dial for timepieces of this invention. It is sectional drawing which shows 2nd Embodiment of the dial for timepieces of this invention. It is sectional drawing which shows 1st Embodiment of the manufacturing method of the timepiece dial of this invention. It is sectional drawing which shows 2nd Embodiment of the manufacturing method of the dial for timepieces of this invention. It is sectional drawing which shows suitable embodiment of the timepiece (watch) of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Timepiece dial 2 ... Board | substrate 21 ... Uneven surface 3 ... Dispersion layer 31 ... Powder (glossy powder) 311 ... Base part 312 ... Metal thin film 32 ... Dispersion medium (hardening part) 4 ... Different direction arrangement member 94 ... Solar cell 81 ... Movement 82 ... Body (case) 83 ... Back cover 84 ... Bezel (edge) 85 ... Glass plate (cover glass) 86 ... Winding pipe 87 ... Crown 871 ... Shaft part 872 ... Groove 88 ... Plastic packing 89 ... Plastic Packing 91 ... Rubber packing (Crown packing) 92 ... Rubber packing (back cover packing) 93 ... Junction (seal part) 100 ... Wristwatch (portable watch)

Claims (15)

A plurality of scaly powders having a function of reflecting light is disposed on the substrate,
A timepiece dial comprising a plurality of different-direction disposing means on the substrate such that main surfaces of the plurality of powders face different directions.   The timepiece dial according to claim 1, further comprising a dispersion layer in which the powder is dispersed in a dispersion medium. The relationship of | n _M −n _B | ≦ 0.18 is satisfied, where n _{M is} a refractive index of the dispersion medium constituting the layer and n _B is a refractive index of a constituent material of the substrate. The clock face described.   The timepiece dial according to any one of claims 1 to 3, wherein the different direction arrangement means is an uneven surface of the substrate.   The timepiece dial according to claim 4, wherein the irregular surface has irregularities provided regularly.   The timepiece dial according to claim 4 or 5, wherein the different direction arrangement means has a substantially conical shape.   The timepiece dial according to any one of claims 4 to 6, wherein the uneven surface has a height difference of 50 to 220 µm.   Any of Claims 1 thru | or 7 which satisfy | fill the relationship of 0.3 <= X / Y <= 1.7 when the height difference of the said uneven | corrugated surface is set to X [micrometer] and the average particle diameter of the said powder is set to Y [micrometer]. A clock dial as described in Crab.   The timepiece dial according to any one of claims 1 to 8, wherein the different direction arrangement means is a different direction arrangement member provided separately on the substrate.   The timepiece dial according to claim 9, wherein the different-direction arrangement member has a substantially spherical shape or a substantially cylindrical shape.   The timepiece dial according to claim 9 or 10, wherein a height of the different direction arrangement member is 50 to 220 µm.   12. The relationship of 0.3 ≦ X / Y ≦ 1.7 is satisfied, where X is the height of the differently arranged member and X is the average particle diameter of the powder. A dial for a clock according to any one of the above. The relationship of | n _O −n _B | ≦ 0.18 is satisfied, where n _{O is} the refractive index of the constituent material of the different direction arrangement member and n _B is the refractive index of the constituent material of the substrate. The timepiece dial according to any one of 12 above.   The timepiece dial according to any one of claims 1 to 13, wherein the timepiece dial has a light transmittance of 20% or more.   A timepiece comprising the timepiece dial according to claim 1.

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