JP5720265B2 - Solar clock dial and clock - Google Patents

Description

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

  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. 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.

  In particular, in the method as described above, when the metal film is stuck on the substrate, the metal film is likely to be wrinkled, and it is necessary to perform the sticking work carefully in order to prevent the occurrence of such wrinkles. And the productivity of the dial is extremely low. Moreover, even when the sticking operation is carried out with sufficient care, it is difficult to sufficiently prevent the generation of relatively small wrinkles, etc., and even if the opening ratio of the metal film is low, the obtained characters It was extremely difficult to make the aesthetic appearance of the board sufficiently excellent. In addition, the above-described method generates defective products at a relatively high rate, which is not preferable from the viewpoint of production yield and resource saving. The above problems are particularly noticeable when the metal film is relatively thin (for example, 10 μm or less). In addition, when the metal film is relatively thin (for example, 10 μm or less), the metal film is easily broken when performing the sticking operation, which is disadvantageous from the viewpoints of dial productivity, production cost, and resource saving. At the same time, a part of the torn metal film may be scattered as fine particles in the atmosphere, and there is a concern about human health.

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 dial for a solar timepiece that is excellent in light transmission and excellent in aesthetic appearance, and to provide a timepiece having the dial for solar timepiece.

ADVANTAGE OF THE INVENTION According to this invention, while being excellent in the light transmittance, the dial for solar timepieces which was excellent in the aesthetic appearance can be provided, and the timepiece provided with the said dial for solar timepieces can be provided.

Such an object is achieved by the present invention described below.
The dial for a solar timepiece of the present invention is a dial for a solar timepiece used for a timepiece equipped with a solar cell,
A ridge member provided with a ridge having a function of reflecting and scattering incident light on one surface;
A plurality of metal powders having an average particle diameter of 5 μm or more and 20 μm or less and an average thickness of 30 nm or more and 50 nm or less are provided, which is provided on the surface of the protrusion member where the protrusions are provided. A dispersion film,
The ridge member has a flat portion between adjacent ridges in a cross section in the thickness direction of the ridge member in a direction perpendicular to a tangent to the ridge.
The average thickness of the dispersion film is 0.5 μm or more and 3.0 μm or less,
A plurality of the metal powders are arranged at intervals in the thickness direction of the dispersion film ,
The average value of the distance between the metal powders in the thickness direction in the dispersion film is 0.05 μm or more and 1.2 μm or less .
Thereby, while being excellent in the light transmittance (light transmittance), the dial for solar timepieces excellent in the aesthetic appearance can be provided.

In the dial for solar timepiece of the present invention, it is preferable that the ridges in the cross section are regularly arranged and the average pitch is 25 μm or more and 100 μm or less.
Thereby, the aesthetic appearance of the dial for solar timepiece can be made particularly excellent.
In the dial for solar timepiece of the present invention, the average height of the ridges of the ridge member is preferably 12.5 μm or more and 50 μm or less.
Thereby, the aesthetic appearance of the dial for solar timepiece can be made particularly excellent.

In the dial for solar timepiece of the present invention, it is preferable that the average width of the flat portion in the cross section is 1 μm or more and 5 μm or less.
Thereby, the light transmittance (light transmittance) and the aesthetic appearance as the whole dial for solar timepiece can be made particularly excellent.
In the dial for solar timepiece according to the present invention, it is preferable that the ridge member has a plurality of ridges provided concentrically when the dial for solar timepiece is viewed in plan.
Thereby, the aesthetic appearance of the dial for solar timepiece can be made particularly excellent.

In the dial for solar timepiece of the present invention, it is preferable that the ratio of the area occupied by the portion where the metal powder is not disposed when the solar timepiece dial is viewed in plan is 5% or more and 42% or less.
Thereby, the aesthetic appearance can be made especially excellent as the whole dial for solar timepieces, while making the light transmittance sufficiently excellent.

In the dial for solar timepiece of the present invention, the light transmittance of the dial for solar timepiece is preferably 10% or more and 40% or less.
Thereby, the aesthetic appearance of the dial for solar timepiece can be made sufficiently excellent while suitably using the transmitted light for power generation by the solar cell. That is, the dial for solar timepiece can be suitably applied to a solar timepiece equipped with a solar cell.
The timepiece of the present invention includes a dial for a solar timepiece of the present invention ,
A solar cell is provided.
Thereby, the timepiece having an excellent aesthetic appearance can be provided. In addition, since the light from the outside can efficiently pass through the dial for the solar timepiece, it is possible to provide a timepiece (for example, a solar timepiece) that can effectively use the light from the outside. .

It is sectional drawing which shows suitable embodiment of the timepiece dial of this invention. It is a top view which shows typically the example of the arrangement pattern of the protrusion which a protrusion has. It is a top view which shows typically the example of the arrangement pattern of the protrusion which a protrusion has. It is a top view which shows typically the example of the arrangement pattern of the protrusion which a protrusion has. It is a top view which shows typically the example of the arrangement pattern of the protrusion which a protrusion has. It is a top view which shows typically the example of the arrangement pattern of the protrusion which a protrusion has. It is a fragmentary sectional view which shows suitable embodiment of the timepiece (portable timepiece) of this invention.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.
First, a preferred embodiment of the timepiece dial of the present invention will be described.
<Watch dial>
FIG. 1 is a cross-sectional view showing a preferred embodiment of the timepiece dial of the present invention, and FIGS. 2 to 6 are plan views schematically showing an example of an arrangement pattern of ridges of the ridge member.

  As shown in FIG. 1, the timepiece dial 1 has an average thickness of 0.5 μm or more, in which a light-transmitting ridge member 11 and a plurality of metal powders 121 are dispersed in a dispersion medium 122. And a dispersion film 12 of 0 μm or less. The surface (second surface) 112 facing the dispersion film 12 of the ridge member 11 has a function of reflecting and scattering light incident from the opposite surface (first surface) 111 side. In the cross section in the direction perpendicular to the tangent to the ridge 113 and in the thickness direction of the ridge member 11, there is a flat portion 114 between adjacent projections. The metal powder 121 constituting the dispersion film 12 has an average particle size of 5 μm or more and 20 μm or less and an average thickness of 30 nm or more and 50 nm or less. The dispersion film 12 is arranged in the thickness direction with a predetermined interval.

The present inventor has earnestly studied that the light dial and the aesthetic appearance of the timepiece dial as a whole can be made excellent by making the structure of the timepiece dial like this. I found the result. On the other hand, if even one of the above conditions is not satisfied, the excellent effect as described above cannot be obtained.
The timepiece dial 1 is used such that the first surface 111 side of the ridge member 11 faces the observer side (outer surface side).

[Rectangular member]
The ridge member 11 is made of a light transmissive material. 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. Such light transmittance is, for example, using a white fluorescent lamp (manufactured by Toshiba Corporation, inspection fluorescent lamp FL20S-D65) as a light source, and a member to be measured (or timepiece dial) under 1000 lux. For the current value (X) when power is generated only with a solar cell (solar cell) of the same shape, except that the measurement target member (or timepiece dial) is placed on the light source side surface of the solar cell. The ratio ((Y / X) × 100 [%]) of the current value (Y) when power is generated in the same state as can be adopted. Hereinafter, unless otherwise specified, in this specification, “light transmittance” refers to a value obtained under such conditions.

  Examples of the material constituting the ridge member 11 include various plastic materials and various glass materials, but the ridge member 11 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. Moreover, it is advantageous for the manufacturing cost reduction of the timepiece dial 1 that the protruding item | line member 11 is comprised with the plastic material. In addition, since plastic materials are generally excellent in light (visible light) transmission and also in radio wave transmission, if the ridge member 11 is made of a plastic material, The plate 1 can be suitably applied to a radio timepiece as described later. In the following description, an example in which the ridge member 11 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 ridge member 11 include various thermoplastic resins and various thermosetting resins. For example, polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS resin), polymethyl methacrylate, and the like. Acrylic resins such as (PMMA), polyolefin resins such as polyethylene (PE) and polypropylene (PP), polyester resins such as polyethylene terephthalate (PET), etc., or copolymers, blends, and polymers mainly containing these resins An alloy etc. are mentioned, Among these, it can use combining 1 type (s) or 2 or more types (for example, as a blend resin, a polymer alloy, a laminated body, etc.). In particular, it is preferable that the ridge member 11 is mainly composed 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 protruding item | line member 11 increases (easiness of shaping | molding improves), even if it is the timepiece dial 1 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.

In addition, the protruding item | line member 11 may contain components other than a plastic material. 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 ridge member 11 is made of a material containing a colorant, variations in the color of the timepiece dial 1 can be expanded.
The ridge member 11 may have a substantially uniform composition at each site, or may have a different composition depending on the site.

The refractive index (absolute refractive index) of the ridge member 11 is preferably 1.500 or more and 1.650 or less, and more preferably 1.550 or more and 1.600 or less. Thereby, the reflection and scattering of light as will be described in detail later can be suitably caused, and both the aesthetic appearance and light transmission of the timepiece dial 1 can be made excellent.
The ridge member 11 has a ridge 113 having a function of reflecting and scattering light incident from the first surface 111 side on the second surface 112 which is the main surface opposite to the first surface 111. A flat portion 114 is provided between adjacent convex portions in a cross section (see FIG. 1) in the direction perpendicular to the tangent line of the convex strip 113 and in the thickness direction of the convex strip member 11.

  By the way, since the ridge member 11 has light transmittance, a part of the light from the outside of the timepiece dial 1 (light from the upper side in FIG. 1) enters the ridge member 11. Will be. The light that has entered the ridge member 11 travels from the first surface 111 side to the second surface 112 side, and part of the light exits from the second surface 112 side (that is, the ridge member). The other part is reflected / scattered by the ridge 113 provided on the second surface 112. Thereby, the light that has once entered the ridge member 11 from the first surface 111 side can be emitted again from the first surface 111 side.

The ridges 113 may be arranged in any way, but are preferably arranged regularly when the ridge members 11 are viewed in plan. Thereby, it is possible to effectively prevent unintentional color unevenness and the like from occurring in each part (each part in a plan view) of the timepiece dial 1.
As an arrangement pattern of the ridges 113 (an arrangement pattern when viewed in plan), for example, a pattern in which a plurality of ridges 113 are arranged concentrically (see FIG. 2), a pattern in which the ridges 113 are arranged in a spiral shape. (See FIG. 3), a pattern in which a large number of linear ridges 113 are arranged in a one-dimensional direction (see FIG. 4), and a pattern in which a large number of linear ridges 113 are arranged in a two-dimensional direction (FIG. 5, For example).

Among them, the arrangement pattern of the ridges 113 is particularly preferably a plurality of ridges 113 arranged concentrically. Thereby, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent.
The average value of the pitch _{P 1} of the ridges 113 in the cross section (the average pitch) is not particularly limited, but is preferably 25μm or more 100μm or less, more preferably 30μm or more 70μm or less. If the average value of the pitch P ₁ of the ridge 113 (average pitch) is within this range, it can be a particularly outstanding appearance of the timepiece dial 1.

The height average value of an _{H 1} of ridges 113 (average height) is not particularly limited, but is preferably 50μm or less than 12.5 .mu.m, and more preferably 15μm or more 35μm or less. When the average value (average height) of the heights H ₁ of the ridges 113 is within the above range, the timepiece dial 1 is made sufficiently high in light transmittance as the timepiece dial 1. The aesthetic appearance can be made particularly excellent.

In the illustrated configuration, the cross-sectional shape of the ridge 113 in the cross-section is an isosceles triangle. If the cross-sectional shape of the ridge 113 is such, light incident from the first surface 111 side can be appropriately reflected and scattered, and the light transmission and aesthetic appearance of the timepiece dial 1 can be obtained. Can be achieved at a particularly high level.
The angle of the top of the ridge 113 (θ ₁ in the figure) is not particularly limited, but is preferably 70 ° or more and 100 ° or less, and more preferably 90 °. Thereby, the light incident from the first surface 111 side can be appropriately reflected and scattered, and the light transmission and the aesthetic appearance of the timepiece dial 1 can be achieved at a very high level. .

  Further, as described above, the ridge member 11 is provided between adjacent ridges in a cross section (see FIG. 1) perpendicular to the tangent line of the ridge 113 and in the thickness direction of the ridge member 11. A flat portion 114 is provided. Thus, the timepiece dial 1 is characterized in that the ridge member 11 has the flat portion 114 together with the ridge 113. By having the flat portion 114 together with the ridge 113, the light transmission of the timepiece dial 1 as a whole can be made particularly excellent while the appearance of the timepiece dial 1 is made excellent.

The average value (average width) of the width W ₁ of the flat portion 114 in the cross section is not particularly limited, but is preferably 1 μm or more and 5 μm or less, and more preferably 2 μm or more and 4 μm or less. Thereby, the light transmission (light transmission) and the aesthetic appearance of the timepiece dial 1 as a whole can be made particularly excellent.
Moreover, it is preferable that the 1st surface 111 of the protruding item | line member 11 is comparatively flat (smooth). Thereby, the aesthetic appearance of the timepiece dial 1 is particularly excellent. Further, the first surface 111 of the ridge member 11 may be provided with a pattern such as a radial shape or a vortex. Thereby, the variation of the design of the timepiece dial 1 can be expanded, and the aesthetic appearance of the timepiece dial 1 can be made particularly excellent. The surface roughness Ra of the first surface 111 is preferably 0.001 μm or more and 5.0 μm or less, and more preferably 0.001 μm or more and 2.5 μm or less. As a result, the above-described effects are exhibited more significantly.

The shape and size of the ridge member 11 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 ridge member 11 has a flat plate shape, but may have, for example, a curved plate shape.
The average thickness of the ridge member 11 is not particularly limited, but is preferably 50 μm or more and 500 μm or less, more preferably 100 μm or more and 450 μm or less, and further preferably 150 μm or more and 400 μm or less. When the average thickness of the ridge member 11 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 of the battery from being seen through, and to make the aesthetic appearance (luxury feeling) particularly excellent. Moreover, when the average thickness of the ridge member 11 is a value within the above range, the timepiece dial 1 is effectively prevented from being thickened by the timepiece to which the timepiece dial 1 is applied. The mechanical strength, shape stability, etc. can be made sufficiently excellent.

  Moreover, although the protruding item | line member 11 may be shape | molded by what kind of method, as a forming method of the protruding item | line member 11, compression molding, extrusion molding, injection molding, stereolithography, etc. are mentioned, for example. Alternatively, a plate-like member having no projections and depressions may be prepared, and a process such as cutting may be performed on the plate-like member to manufacture the projection member 11 provided with the projections 113. Further, since the ridge and the groove are relative to each other, as a result of providing the groove on the ridge member 11, other portions may be the ridge 113.

[Dispersion film]
On the second surface 112 side of the ridge member 11, a dispersion film 12 having a plurality of metal powders 121 dispersed in a dispersion medium 122 and having an average thickness of 0.5 μm to 3.0 μm is provided. . The metal powder 121 constituting the dispersion film 12 has an average particle diameter of 5 μm or more and 20 μm or less and an average thickness of 30 nm or more and 50 nm or less. In the dispersion film 12, a plurality of metal powders are included. 121 are arranged at predetermined intervals in the thickness direction of the dispersion film 12. With such a configuration, the timepiece dial 1 as a whole is made of a metal material while allowing light incident from the ridge member 11 side to be transmitted with sufficient transmittance by using the interval in the thickness direction. A distinctive high-grade color tone can be obtained, and the appearance of the timepiece dial 1 can be made extremely excellent.

In addition, by providing a dispersion film as described above, it is not necessary to perform plating, so that the waste of plating solution does not occur and the environmental burden associated with the production of timepiece dials is reduced. Can do.
Such an excellent effect cannot be obtained when a simple metal plating layer is provided or when an opening is formed in a metal film by a mechanical method or a chemical method.

As described above, the average particle size of the metal powder 121 is 5 μm or more and 20 μm or less, preferably 6 μm or more and 18 μm or less, and more preferably 7 μm or more and 15 μm or less. Thereby, the effects as described above are more remarkably exhibited. In addition, an average particle diameter refers to the diameter of the perfect circle which has the same area as the average area at the time of planar view about several metal powder.
As described above, the average thickness of the metal powder 121 is not less than 30 nm and not more than 50 nm, but is preferably not less than 35 nm and not more than 45 nm. Thereby, the effects as described above are more remarkably exhibited.
In addition, as described above, the average thickness of the dispersion film 12 is 0.5 μm or more and 3.0 μm or less, preferably 0.6 μm or more and 2.2 μm or less, and 0.7 μm or more and 1.0 μm or less. It is more preferable that Thereby, the effects as described above are more remarkably exhibited.

  The dispersion film 12 may be provided so as not to come into contact with other members constituting the timepiece dial 1 itself, or on the surface (second surface 112) of the ridge member 11. Although it may be provided so as to be in close contact, in the configuration shown in the figure, it is provided on the surface of the substrate (support substrate) 13. Thereby, in the timepiece dial 1, the dispersion film 12 can be more reliably arranged in parallel with the ridge member 11, and the stability of the shape of the dispersion film 12 is improved. The aesthetic appearance of No. 1 can be stably improved, and the reliability of the timepiece dial 1 can be particularly improved.

  Moreover, in the timepiece dial 1, as described above, the plurality of metal powders 121 are arranged at predetermined intervals in the thickness direction of the dispersion film 12. The average value of the distance X of the metal powder 121 in the vertical direction is preferably 0.05 μm or more and 1.2 μm or less, and more preferably 0.1 μm or more and 1.1 μm or less. Thereby, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent while sufficiently improving the light transmittance of the timepiece dial 1 as a whole.

  When the timepiece dial 1 is viewed in plan, the proportion of the area occupied by the portion where the metal powder 121 is not disposed is preferably 5% or more and 42% or less, and more preferably 5% or more and 26% or less. . Thereby, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent while sufficiently improving the light transmittance of the timepiece dial 1 as a whole. Such a condition can be easily and reliably realized by using a metal powder satisfying the above conditions to form a dispersion film having a predetermined thickness.

The shape of the metal powder 121 in plan view may be any shape, but is preferably a rectangular shape, and more preferably a square shape. Thereby, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent.
Examples of the metal material constituting the metal powder 121 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. When the metal powder 121 is made of such a material, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent.

  The content of the metal powder 121 in the dispersion film 12 is preferably 5 vol% or more and 40 vol% or less, more preferably 7 vol% or more and 35 vol% or less, and further preferably 10 vol% or more and 33 vol% or less. . When the content of the metal powder 121 in the dispersion film 12 is a value within the above range, the adhesion of the dispersion film 12 to the substrate 13 is sufficiently excellent, and the durability of the timepiece dial 1 is sufficiently excellent. In addition, the aesthetic appearance and light transmittance of the timepiece dial 1 can be made particularly excellent.

The dispersion medium 122 constituting the dispersion film 12 is solid and has a function of dispersing a plurality of metal powders 121.
The dispersion medium 122 is composed of a light-transmitting material, but is preferably composed of a resin material, and more preferably composed of a cured product of a curable resin. . Thereby, the adhesiveness of the dispersion film 12 with the substrate 13 can be made particularly excellent, and the durability of the timepiece dial 1 can be made particularly excellent.

  In the case where at least the portion of the substrate 13 in contact with the dispersion film 12 is made of polycarbonate and / or acrylic resin, the dispersion film 12 uses acrylic resin and / or urethane resin as the dispersion medium 122. It is preferable to include. As a result, the adhesion between the substrate 13 and the dispersion film 12 can be made particularly excellent, and the durability of the timepiece dial 1 can be made particularly excellent.

Moreover, it is preferable that the surface of the dispersion film 12 is relatively flat (smooth). Thereby, the aesthetic appearance of the timepiece dial 1 is particularly excellent. Further, the surface of the dispersion film 12 may be provided with a pattern such as a radial pattern or a vortex pattern. Thereby, the variation of the design of the timepiece dial 1 can be expanded, and the aesthetic appearance of the timepiece dial 1 can be made particularly excellent. The surface roughness Ra of the surface of the dispersion film 12 is preferably 0.001 μm or more and 5.0 μm or less, and more preferably 0.001 μm or more and 2.5 μm or less. As a result, the above-described effects are exhibited more significantly.
Further, the shape and size of the dispersion film 12 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 dispersion film 12 has a flat plate shape, but may have, for example, a curved plate shape.

[substrate]
The substrate 13 is light transmissive and has a function of supporting the dispersion film 12 described above.
Examples of the constituent material of the substrate 13 include various plastic materials and various glass materials. Moreover, the board | substrate 13 may contain other components, such as a coloring agent.

When the substrate 13 is made of plastic, it can be formed into a desired shape relatively easily. Moreover, the weight of the timepiece dial 1 as a whole can be reduced, and the impact resistance can be made particularly excellent as compared with glass.
Moreover, when the board | substrate 13 is comprised with glass, the light transmittance as the timepiece dial 1 whole can be made especially excellent.

  The substrate 13 is preferably made of polycarbonate and / or acrylic resin. Thereby, the durability of the timepiece dial 1 can be made particularly excellent. Further, the timepiece dial 1 as a whole can have a particularly excellent aesthetic appearance while sufficiently improving the light transmittance. As a result, the timepiece dial 1 can be suitably applied to a solar timepiece or a radio timepiece. Further, in the case where the dispersion film 12 described in detail later contains an acrylic resin and / or a urethane resin, at least a portion of the substrate 13 that is in contact with the dispersion film 12 is made of polycarbonate and / or an acrylic resin. As a result, the adhesion between the substrate 13 and the dispersion film 12 can be made particularly excellent, and the durability of the timepiece dial can be made even more excellent.

  The substrate 13 may have a substantially uniform composition at each site, or may have a different composition depending on the site. For example, the substrate 13 may have a base and a coat layer provided on the base. In this case, for example, the coat layer may include a colorant. Thereby, for example, by using a common member as the base and changing the colorant contained in the coat layer, it is possible to suitably cope with the production of a plurality of types of timepiece dials having different colors. The coat layer may be provided on the side in contact with the dispersion film 12, or may be provided on the opposite side.

  In particular, when the substrate 13 has a coating layer made of a material containing a colorant on the surface in contact with the dispersion film 12, the aesthetic appearance of the timepiece dial 1 can be further improved. More specifically, when the coating layer is provided on the surface in contact with the dispersion film 12, the color tone of the timepiece dial 1 can be changed without impairing the function of the dispersion film 12 as described in detail later. can do.

The shape and size of the substrate 13 are not particularly limited, and are usually determined based on the shape and size of the timepiece dial 1. In the illustrated configuration, the substrate 13 (dial plate main body) 2 has a flat plate shape, but may have a curved plate shape, for example.
The average thickness of the substrate 13 is not particularly limited, but is preferably 100 μm or more and 600 μm or less, more preferably 150 μm or more and 450 μm or less, and further preferably 200 μm or more and 400 μm or less. When the average thickness of the substrate 13 is within the above range, the mechanical strength of the timepiece dial 1 can be effectively prevented while the timepiece to which the timepiece dial 1 is applied is effectively prevented from being thickened. The shape stability and the like can be made sufficiently excellent.

The substrate 13 may be formed by any method such as compression molding or injection molding. The surface of the substrate 13 may be subjected to surface processing such as mirror surface processing, streak processing, and satin processing.
The light transmittance (visible light) of the timepiece dial 1 is preferably 10% or more and 40% or less, more preferably 12% or more and 35% or less, and more preferably 15% or more and 30% or less. Is more preferable. Thereby, the aesthetic appearance of the timepiece dial 1 can be made sufficiently excellent while suitably utilizing the transmitted light for power generation by the solar cell. That is, the timepiece dial 1 can be suitably applied to a solar timepiece having a solar battery.

  The average thickness of the timepiece dial 1 is not particularly limited, but is preferably 200 μm or more and 700 μm or less, and more preferably 350 μm or more and 600 μm or less. When the average thickness of the timepiece dial 1 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 Mechanical strength, shape stability, etc. can be made sufficiently excellent.

Moreover, the timepiece dial 1 may have a coating layer (not shown).
As described above, the timepiece dial 1 is excellent in aesthetic appearance and light transmittance. For this reason, the timepiece dial 1 can be suitably applied to a solar timepiece (a timepiece incorporating a solar cell) or the like.
Moreover, since the timepiece dial 1 is excellent in durability, it can be suitably applied to a portable timepiece (for example, a wristwatch).

<Clock>
Next, the timepiece of the present invention provided with the timepiece dial of the present invention as described above 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 light transmittance and decorativeness (aesthetic appearance). For this reason, the timepiece of the present invention provided with such a timepiece dial can sufficiently satisfy the requirements for 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. Hereinafter, an example of the configuration of the timepiece of the present invention will be described. explain.

FIG. 7 is a cross-sectional view showing a preferred embodiment of the timepiece (watch) of the present invention.
As shown in FIG. 7, the wristwatch (portable timepiece) 100 of the present embodiment includes a trunk (case) 82, a back cover 83, a bezel (edge) 84, and a glass plate (cover glass) 85. . 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 the solar cell 94 and a glass plate (cover glass) 85, and the first surface 111 of the ridge member 11 faces the glass plate (cover glass) 85 side. Are arranged as follows.

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. 7, 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.

Since the above portable watch (watch) is required to have particularly excellent durability (for example, impact resistance, etc.) among various types of watches, a book with excellent aesthetic appearance and excellent durability can be obtained. The invention can be applied more suitably.
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. Further, the present invention can be applied to any timepiece such as a solar timepiece excluding a solar radio timepiece and a radio timepiece excluding a solar radio timepiece.
The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above.

For example, in the timepiece dial and timepiece of the present invention, the configuration of each part can be replaced with any configuration that exhibits the same function, and any configuration can be added. For example, you may have a printing part formed by various printing methods. In addition, at least one layer may be provided on the surface of the ridge member and / or the dispersion film. Such a layer may be removed, for example, when the timepiece dial is used.
In the above-described embodiment, the ridge of the ridge member has been described as being provided on the entire second surface, but the ridge is selectively provided only on a part of the second surface. It may be what was made.

Next, specific examples of the present invention will be described.
1. Manufacture of timepiece dials Timepiece dials (wristwatch dials) of Examples and Comparative Examples were manufactured by the following method.
Example 1
First, a base material having the shape of a watch dial is manufactured by injection molding using polycarbonate, and then a protruding portion is obtained by punching out necessary portions, cutting unnecessary burrs, etc., and polishing them. It was. The obtained ridge member was substantially disk-shaped and had a diameter: 27 mm × average thickness: 250 μm. In addition, the obtained ridge member has a first surface which is one main surface is flat, the surface roughness Ra of the first surface is 0.07 μm, and the main surface on the opposite side to the first surface. A plurality of ridges regularly and concentrically provided over the entire second surface, which is a surface, in a direction perpendicular to a tangent to the ridge and in the thickness direction of the ridge member In the cross section, a flat portion was provided between adjacent convex portions (see FIG. 2). The pitch of the ridges in the cross section in the direction perpendicular to the tangent to the ridges and in the thickness direction of the ridge members was 50 μm. Further, the height of the ridge was 24.5 μm. In addition, the cross-sectional shape of the ridge was an isosceles triangle, and the angle of the vertex of the ridge (θ _{1 in} FIG. ₁ ) was 90 °. The width of the flat portion in the cross section was 1 μm.

Next, a substrate having the shape of a timepiece dial was produced by compression molding using polycarbonate, and then necessary portions were cut and polished. The obtained substrate was substantially disc-shaped and had a diameter of about 27 mm × thickness: 250 μm. Further, the surface of the substrate was flat, and the surface roughness Rz was 20 μm or less.
Next, this substrate was cleaned. As the cleaning of the substrate, first, alkaline immersion degreasing was performed for 30 seconds, then neutralization was performed for 10 seconds, washing with water for 10 seconds, and cleaning with pure water for 10 seconds.

  On one surface of the substrate thus cleaned, a dispersion in which Al powder (metal powder) having a square shape when flattened was dispersed was applied by spray coating three times. The spray coating was performed by applying the dispersion from a direction inclined by 45 ° from the normal direction of the substrate. As the dispersion, Al powder (average thickness: 40 nm, average particle size: 10 μm): 1 wt%, acrylic resin: 1 wt%, isopropyl alcohol: 1 wt%, ethyl acetate: 40 wt%, n-butyl acetate: 20 wt%, acetic acid A composition having a composition of isopropyl: 2 wt%, propylene glycol monomethyl ether acetate: 5 wt%, and butyl cellosolve: 30 wt% was used.

The standard of the coating thickness per one time was set to about 0.3 μm, and after the above three times of spray coating, the substrate to which the dispersion was applied was subjected to heat treatment at 60 ° C. for 30 minutes. Thereby, the dispersion film was formed on the substrate (support substrate). The average thickness of the dispersion film was 0.9 μm. Moreover, the average value of the interval of the Al powder in the thickness direction in the dispersion film was 0.3 μm.
Then, the timepiece dial was obtained by superimposing the second surface of the ridge member and the dispersion film provided on the substrate in contact with each other.
(Examples 2 to 14)
A watch dial was manufactured in the same manner as in Example 1 except that the conditions of the ridge member, dispersion film, and substrate (support substrate) were as shown in Table 1.

(Comparative Example 1)
A timepiece dial was manufactured in the same manner as in Example 1 except that the dispersion film was not manufactured and only the ridge member was used.
(Comparative Example 2)
A timepiece dial was manufactured in the same manner as in Example 1 except that the protrusion member was not manufactured and only the substrate (support substrate) on which the dispersion film was formed was used.
(Comparative Example 3)
A timepiece dial was manufactured in the same manner as in Comparative Example 1 except that the average thickness of the ridge members was changed as shown in Table 2.

(Comparative Example 4)
A timepiece dial was manufactured in the same manner as in Comparative Example 2 except that the average thickness of the substrate (support substrate) was changed as shown in Table 2.
(Comparative Example 5)
A watch dial is manufactured in the same manner as in Example 1 except that the condition of the ridges of the ridge member is changed and no flat part is provided between the adjacent protrusions in the cross section. did.

(Comparative Examples 6-11)
A timepiece dial was manufactured in the same manner as in Example 1 except that the configuration and application amount of the dispersion used for forming the dispersion film were changed.
(Comparative Example 12)
Instead of forming a dispersion film on the surface of the substrate, a timepiece dial was prepared in the same manner as in Example 1 except that a 50 nm thick Al metal film (metal thin film) was formed by vacuum deposition. Manufactured.

(Comparative Example 13)
A timepiece dial was manufactured in the same manner as in Comparative Example 12 except that the average thickness of the metal coating (metal thin film) was changed to 100 nm by changing the film formation time by the vacuum deposition method.
(Comparative Example 14)
First, a flat plate made of stainless steel having a smooth surface was prepared.

Next, a resist film having an average thickness of 20 μm was printed on the surface of the flat plate.
Next, this resist film was exposed using an exposure apparatus, and further developed, whereby a part of the resist film was removed, and a large number of circular resist films (diameter: 300 μm) remained.
Thereafter, a metal film was formed on the flat plate by sputtering. The metal film was formed as follows.

First, the inside of the apparatus was evacuated (depressurized) to 3 × 10 ⁻³ Pa, and then argon gas was introduced at an argon gas flow rate of 35 ml / min. In this state, Ag was used as a target, and discharge was performed under the conditions of input power: 1400 W and treatment time: 2.0 minutes, thereby forming a metal film composed of Ag. The average thickness of the metal film thus formed was 0.20 μm.

Next, the remaining resist film was removed from the stainless steel flat plate. The resist film was removed by immersing a flat plate coated with the resist film and the metal coating in an aqueous solution of sodium hydroxide at 30 to 40 ° C. for 5 to 10 minutes. As a result, a metal film having a large number of circular openings was obtained. The diameter of the opening part which a metal film has was 300 micrometers.
On the other hand, a polycarbonate substrate having the shape of a timepiece dial to be manufactured was prepared in the same manner as in Example 1, and this substrate was washed in the same manner as in Example 1.

Next, an adhesive was applied to the washed polycarbonate substrate, and the metal film having the opening was peeled off from the stainless steel flat plate and bonded to the substrate via the adhesive. At this time, sufficient care was taken not to tear the metal film and to prevent wrinkles from forming on the metal film to be bonded to the substrate. However, when peeling from the flat plate, a part of the metal film was torn. There were some things.
Then, the dial for timepieces was obtained by superimposing so that the 2nd surface of a plate-shaped member (projection strip member) and the metal film provided on the board | substrate may contact. Wrinkles were observed on the metal coatings produced during joining on the many timepiece dials manufactured.

(Comparative Example 15)
A timepiece dial was manufactured in the same manner as in Comparative Example 14 except that the diameter of the opening formed in the metal film was changed to 5 μm by changing the exposure conditions for the resist film.
Tables 1 and 2 collectively show the configuration of the timepiece dial of each example and each comparative example. In the table, polycarbonate is represented by PC, acrylonitrile-butadiene-styrene copolymer (ABS resin) is represented by ABS, and acrylic resin is represented by Ac. In the table, in the column “arrangement pattern of ridges”, as shown in FIG. 2, a pattern in which a plurality of ridges are arranged concentrically is indicated by “a”, and as shown in FIG. A pattern in which the ridges are spirally arranged is indicated by “b”. In the table, the interval between the metal powders in the thickness direction in the dispersion film is “X”, and the proportion of the area occupied by the portion where the metal powder is not arranged when the timepiece dial is viewed in plan is “Y”. Indicated. Each part of the timepiece dial plate was composed mainly of the components shown in Tables 1 and 2, and the content of other components was less than 0.1 wt%.

2. Appearance Evaluation of Watch Dials Each watch dial plate manufactured in each of the above Examples and Comparative Examples was visually observed and evaluated in accordance with the following seven criteria. In addition, about the timepiece dial of each Example and Comparative Examples 1, 3, and 5-15, it observes from the 1st surface side of a protruding member, About the timepiece dial of Comparative Examples 2 and 4, Observation was performed from the side of the dispersion film.

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. Evaluation of Light Transmittance of Wristwatch Dial The light transmission 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 six criteria. It can be said that the larger the light transmittance, the better the light transmittance of the timepiece dial. In addition, about the dial for timepiece of each Example and Comparative Examples 1, 3, and 5-15, it superimposes on a solar cell so that the 1st surface of a ridge member may face the white fluorescent lamp (light source) side, The timepiece dials of Comparative Examples 2 and 4 were superimposed on the solar cell so that the dispersion film faced the white fluorescent lamp (light source) side.

A: 45% or more.
B: 43% or more and less than 45%.
C: 41% or more and less than 43%.
D: 36% or more and less than 41%.
E: 22% or more and less than 36%.
F: Less than 22%.

4). 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, for the timepiece dials of the examples and comparative examples 1, 3, and 5 to 15, the first surface of the ridge member is directed to the outer surface side, and the timepiece characters of comparative examples 2 and 4 are used. About the board, the dispersion film was made to face the outer surface side.

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.

5). Stability evaluation of color tone Each watch dial plate produced in each of the above Examples and Comparative Examples was allowed to stand for 72 hours in an environment of temperature: 75 ° C. and humidity: 90% RH, and immediately observed by visual observation. And evaluated according to the following five-step criteria. In addition, about the timepiece dial of each Example and Comparative Examples 1, 3, and 5-15, it observes from the 1st surface side of a protruding member, About the timepiece dial of Comparative Examples 2 and 4, Observation was performed from the side of the dispersion film.

A: No decrease in aesthetics is observed.
B: Almost no deterioration in aesthetics is observed.
C: A slight decrease in aesthetics is observed.
D: A decrease in aesthetics is clearly observed.
E: A significant decrease in aesthetics is observed.
These results are shown in Table 3.

As is apparent from Table 3, the timepiece dial of the present invention had an excellent aesthetic appearance and was excellent in light transmission. In addition, the timepiece dial of the present invention was excellent in radio wave permeability. On the other hand, in the comparative example, a satisfactory result was not obtained.
Further, a timepiece as shown in FIG. 7 was assembled using the timepiece dials obtained in the respective 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.

DESCRIPTION OF SYMBOLS 1 ... Timepiece dial 11 ... Projection member 111 ... 1st surface 112 ... 2nd surface 113 ... Projection 114 ... Flat part 12 ... Dispersion film 121 ... Metal powder 122 ... Dispersion medium 13 ... Substrate (support substrate) 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 gasket (crown gasket) 92 ... rubber gasket (back cover gasket) 93 ... joint (sealing portion) 100 ... Watch (portable timepiece) H 1 _... height P 1 _... pitch W ₁ ... width

Claims (8)

A dial for a solar clock used in a watch equipped with a solar cell,
A ridge member provided with a ridge having a function of reflecting and scattering incident light on one surface;
A plurality of metal powders having an average particle diameter of 5 μm or more and 20 μm or less and an average thickness of 30 nm or more and 50 nm or less are provided, which is provided on the surface of the protrusion member where the protrusions are provided. A dispersion film,
The ridge member has a flat portion between adjacent ridges in a cross section in the thickness direction of the ridge member in a direction perpendicular to a tangent to the ridge.
The average thickness of the dispersion film is 0.5 μm or more and 3.0 μm or less,
A plurality of the metal powders are arranged at intervals in the thickness direction of the dispersion film ,
A solar timepiece dial , wherein an average value of a distance between the metal powders in the thickness direction in the dispersion film is 0.05 μm or more and 1.2 μm or less . 2. The dial for a solar timepiece according to claim 1, wherein the protrusions in the cross section are regularly arranged, and an average pitch thereof is 25 μm or more and 100 μm or less. The dial for a solar timepiece according to claim 1 or 2, wherein an average height of the ridges of the ridge member is 12.5 µm or more and 50 µm or less. 4. The solar timepiece dial according to claim 1, wherein an average width of the flat portion in the cross section is not less than 1 μm and not more than 5 μm. The ridge member, in a plan view of a solar timepiece dial, solar timepiece dial according to any of claims 1 to 4 and has a plurality of said ridges formed concentrically . It the ratio of the area occupied by the portion where the metal powder is not allocated claims 1 to 5% or less than 42% in a plan view a solar timepiece dial solar timepiece dial according to any one of 5 . Light transmittance of the solar timepiece dial, claims 1 to 40% than 10% or less to solar timepiece dial according to any of 6. A dial for a solar timepiece according to any one of claims 1 to 7 ,
A watch comprising a solar cell .

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