JP2009085773A - Timepiece dial and timepiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a timepiece dial having excellent optical transparency and an excellent esthetic appearance; to provide a timepiece equipped with the timepiece dial; and to provide a timepiece having an excellent esthetic appearance, capable of transmitting light entering from the cover glass side to the movement side with high transmittance. <P>SOLUTION: This timepiece dial 1 is equipped with a plastic plate 22 mainly composed of a plastic material; and a metal plate 21 provided on the observer side rather than the plastic plate 22, and mainly composed of a metal material. The metal plate 21 is provided with an opening part 213 penetrating in the thickness direction. The opening part 213 has a sectional area increasing part 214 wherein the sectional area is increased from the first surface side 211 which is a main surface on the observer side of the metal plate 213 toward the second surface 212 side which is a main surface on the facing side to the plastic plate 22. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

  A dial for a solar timepiece (a timepiece equipped with a solar cell) is required to have a function (light transmittance) that transmits a sufficient amount of light (electromagnetic wave) for the solar cell to generate 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, there is an attempt to cover a metal layer made of a metal material on a plastic substrate and to provide a small hole for transmitting light in the metal layer (see, for example, Patent Document 1).

  However, in order to take in a sufficient amount of external light, by increasing the size of each small hole or increasing the number of small holes sufficiently, etc. It is necessary to increase the total area (sum of the plurality of small hole areas). In such a case, small holes are conspicuous in the appearance of the timepiece dial, and the timepiece dial is inferior in aesthetics (aesthetic appearance). For the purpose of improving the aesthetic appearance of the timepiece dial, reducing the size of each small hole or reducing the number of small holes can transmit a sufficient amount of external light. It may not be possible. Thus, in the past, it has been difficult to obtain a timepiece dial that has both excellent decorativeness (aesthetic appearance) and excellent light (electromagnetic wave) transparency.

  Also, in recent years, radio timepieces that receive radio waves and adjust the time are rapidly spreading. Even in such a radio timepiece or the like, a dial or the like is required to have excellent permeability of electromagnetic waves (radio waves). Solar radio timepieces incorporating a solar battery and further incorporating a radio wave receiving antenna are becoming widespread. In the dial plate applied to the timepiece as described above, as in the above case, it is required to have both excellent decorativeness (aesthetic appearance) and excellent electromagnetic wave permeability. It was difficult.

JP 11-326549 A

  An object of the present invention is to provide a timepiece dial having excellent light transmission and an aesthetic appearance, and to provide a timepiece having the timepiece dial, having an excellent aesthetic appearance, An object of the present invention is to provide a timepiece capable of transmitting light incident from the cover glass side to the movement side with high transmittance.

Such an object is achieved by the present invention described below.
The timepiece dial of the present invention includes a plastic plate mainly composed of a plastic material,
Provided on the observer side than the plastic plate, comprising a metal plate mainly composed of a metal material,
The metal plate is provided with an opening penetrating in the thickness direction,
The opening increases in cross-sectional area from the first surface, which is the main surface on the observer side, of the metal plate toward the second surface, which is the main surface facing the plastic plate. It has a cross-sectional area increasing portion.
As a result, it is possible to provide a timepiece dial having excellent light transmission and an aesthetic appearance.

In the timepiece dial of the present invention, the metal plate preferably has a thickness of 10 to 300 μm.
As a result, it is possible to more effectively express the texture specific to the metal material, the aesthetic appearance (luxury feeling) of the timepiece dial can be made particularly excellent, and light as a timepiece dial Can be made particularly excellent.

In the timepiece dial according to the aspect of the invention, it is preferable that the width of the opening in the cross-sectional area minimum portion where the cross-sectional area is minimum in the cross-sectional area increasing portion is 10 to 200 μm.
As a result, it is possible to more effectively express the texture specific to the metal material, the aesthetic appearance (luxury feeling) of the timepiece dial can be made particularly excellent, and light as a timepiece dial Can be made particularly excellent.

In the timepiece dial of the present invention, it is preferable that the area ratio occupied by the opening when the metal plate is viewed in plan is 10 to 60%.
As a result, it is possible to more effectively express the texture specific to the metal material, the aesthetic appearance (luxury feeling) of the timepiece dial can be made particularly excellent, and light as a timepiece dial Can be made particularly excellent.

In the timepiece dial of the present invention, the cross-sectional area at the cross-sectional area minimum portion where the cross-sectional area is minimum at the cross-sectional area increasing portion is S ₀ [μm ² ], and the cross-sectional area is maximized at the cross-sectional area increasing portion. It is preferable that the relationship of 0.15 ≦ S ₀ / S ₁ ≦ 0.98 is satisfied, where S ₁ [μm ² ] is the cross-sectional area at the maximum cross-sectional area.
Thereby, it is possible to make the light transmittance particularly excellent while sufficiently improving the aesthetic appearance.

In the timepiece dial according to the aspect of the invention, it is preferable that the cross-sectional area increasing portion has a thickness of 10 to 200 μm.
Thereby, it is possible to make the light transmittance particularly excellent while sufficiently improving the aesthetic appearance.
In the timepiece dial of the present invention, it is preferable that the metal plate is mainly composed of Ti, a Ti alloy, or stainless steel.
Thereby, the aesthetic appearance of the timepiece dial can be made particularly excellent, and the mechanical stability of the timepiece dial can be made particularly excellent.

In the timepiece dial of the present invention, the metal plate is provided with a plurality of openings.
The openings are preferably arranged in a staggered pattern when the metal plate is viewed in plan.
Thereby, the texture peculiar to a metal material can be expressed more effectively, and the aesthetic appearance (high-quality feeling) of the timepiece dial can be made particularly excellent.

In the timepiece dial of the present invention, it is preferable that the plastic plate has a thickness of 50 to 500 μm.
Thereby, while making the aesthetic appearance of the timepiece dial plate sufficiently excellent, the light transmittance can be made particularly excellent.
In the timepiece dial of the present invention, it is preferable that an index is provided on the first surface side of the metal plate.
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 metal plate and the plastic plate are separated by a predetermined distance.
As a result, the aesthetic appearance of the timepiece dial can be made particularly excellent, and when the timepiece dial is applied to a solar timepiece, each of the solar cells disposed on the back side of the timepiece dial It is possible to irradiate light with a uniform intensity depending on the part, and the power generation efficiency in the solar cell can be made particularly excellent.

In the timepiece dial according to the aspect of the invention, it is preferable that a distance between a surface of the metal plate facing the plastic plate and a surface of the plastic plate facing the metal plate is 10 to 300 μm.
As a result, the aesthetic appearance of the timepiece dial can be made particularly excellent, and when the timepiece dial is applied to a solar timepiece, each of the solar cells disposed on the back side of the timepiece dial It is possible to irradiate light with a uniform intensity depending on the part, and the power generation efficiency in the solar cell can be made particularly excellent.

The timepiece of the present invention includes the timepiece dial of the present invention.
As a result, it is possible to provide a timepiece having a timepiece dial having excellent light transmission and an aesthetic appearance.
The timepiece of the present invention is a timepiece including a movement and a cover glass disposed on the outer surface side of the movement,
A plastic plate mainly composed of a plastic material is disposed between the movement and the cover glass,
Between the plastic plate and the cover glass, a metal plate mainly composed of a metal material is disposed,
The metal plate is provided with an opening penetrating in the thickness direction,
The opening is cut from the first surface, which is the main surface facing the cover glass, of the metal plate toward the second surface, which is the main surface facing the plastic plate. It has a cross-sectional area increasing portion whose area increases.
Accordingly, it is possible to provide a timepiece that is excellent in aesthetic appearance and can transmit light incident from the cover glass side to the movement side with high transmittance.

  According to the present invention, it is possible to provide a timepiece dial having excellent light transmittance and an aesthetic appearance, providing a timepiece having the timepiece dial, having an excellent aesthetic appearance, It is possible to provide a timepiece capable of transmitting light incident from the cover glass side to the movement side with high transmittance.

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 longitudinal sectional view showing a preferred embodiment of a timepiece dial of the present invention, and FIG. 2 is a schematic plan view for explaining an example of a shape (pattern) of an opening included in a metal plate. is there.

As shown in FIG. 1, the timepiece dial 1 of the present embodiment has a dial main body 2 and an index 3. The dial main body 2 includes a metal plate 21 mainly made of a metal material, a plastic plate 22 mainly made of a plastic material, and a spacer 23 provided between the metal plate 21 and the plastic plate 22. . In the present invention, “mainly” means a component having the largest content among materials constituting the target portion, and the content is not particularly limited, but 60 wt% of the material constituting the target portion. % Or more, preferably 80 wt% or more, more preferably 90 wt% or more.
The timepiece dial 1 is used such that the surface side (upper side in FIG. 1) on which the metal plate 21 of the dial main body 2 is provided faces the observer side (outer surface side). In the following description, the upper side in FIG. 1 is described as “(external light) incident side” and the lower side in FIG. 1 is described as “(external light) exit side” (the same applies to FIG. 3 described later).

[Metal plate]
The metal plate 21 is mainly composed of a metal material. The metal material constituting the metal plate 21 generally has a metallic luster and has a function of reflecting light (visible light). Therefore, the metal plate 21 functions as a reflecting plate that reflects light (visible light).
Various metals (including alloys) can be used as the metal material constituting the metal plate 21, and preferably Fe, Cu, Zn, Ni, Mg, Cr, Mn, Mo, Nb, Al, V, Zr. Sn, Au, Pd, Pt, Ag, Co, In, W, Ti, Rh, and alloys containing at least one of these. The metal plate 21 is made of a material (including an alloy) containing at least one selected from Ag, Cr, Au, Al, Ti, Sn, In, and Fe, among the materials as described above. It is preferable that Ti, Ti alloy, and stainless steel are more preferable. Thereby, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent. Further, if the metal plate 21 is made of the above-described material, even if the size of an opening 213 described later is relatively large or the aperture ratio of the metal plate 21 is relatively large. The appearance of the opening 213 can be made inconspicuous in appearance. In addition, the metal plate 21 may contain components other than a metal material.

The metal plate 21 is arranged so that the first surface 211 which is one main surface thereof faces the viewer side, and the second surface 212 which is the opposite main surface faces the plastic plate 22 side. .
Although the average thickness of the metal plate 21 is not particularly limited, it is preferably 10 to 300 μm, more preferably 20 to 250 μm, and further preferably 50 to 220 μm. When the average thickness of the metal plate 21 is a value within the above range, the texture specific to the metal material can be expressed more effectively, and the aesthetic appearance (luxury feeling) of the timepiece dial 1 is particularly excellent. In addition, the light transmission as the timepiece dial 1 can be made particularly excellent. On the other hand, when the average thickness of the metal plate 21 is less than the lower limit, it becomes difficult to sufficiently exhibit the texture specific to the metal material, and the aesthetic appearance (luxury feeling) of the timepiece dial 1 is sufficient. It becomes difficult to make it excellent. Further, if the average thickness of the metal plate 21 is less than the lower limit value, it becomes difficult to reliably provide the cross-sectional area increasing portion 214 as will be described in detail later, and the aesthetic appearance of the timepiece dial 1 is excellent. It becomes difficult to. On the other hand, if the average thickness of the metal plate 21 exceeds the upper limit value, it may be difficult to make the light transmission as the timepiece dial 1 sufficiently excellent.

  Further, the metal plate 21 may or may not have a uniform composition in each part. For example, the metal plate 21 may be one in which the contained component (composition) sequentially changes in the thickness direction (gradient material). Further, the metal plate 21 may be a laminated body having a plurality of layers. With such a configuration, for example, the aesthetic appearance and mechanical strength of the timepiece dial 1 can be made compatible at a higher level. Moreover, when the metal plate 21 is a laminated body, you may have the layer comprised with the material which does not contain a metal material substantially, for example. More specifically, the metal plate 21 may have a configuration in which a layer made of a metal oxide or the like is interposed between two layers made of a metal material.

The metal plate 21 is provided with an opening 213 penetrating in the thickness direction. Since the metal plate 21 has the opening 213, the light incident on the timepiece dial 1 can be transmitted from the observer side. Thereby, the dial 1 for timepieces can be applied suitably to the solar timepiece provided with the solar cell.
The shape of the opening 213 is not particularly limited. For example, the shape when viewed in plan may be any shape such as a substantially circular shape, a substantially elliptical shape, a substantially polygonal shape, a slit shape, or a lattice shape. In the configuration shown in FIG. 2, the opening 213 has a substantially circular shape when viewed in plan. When the opening 213 has a substantially circular shape, the presence of the opening 213 can be made particularly inconspicuous, and the aesthetic appearance of the timepiece dial 1 is more reliably and particularly excellent. be able to. Further, the opening 213 having such a shape can be easily formed, and the size thereof can be controlled more reliably.

In the configuration shown in FIG. 2, a large number of openings 213 are provided in the metal plate 21, and when the metal plate 21 is viewed in plan, these openings 213 are arranged in a staggered manner. . With such a configuration, the texture specific to the metal material can be expressed more effectively, and the aesthetic appearance (luxury feeling) of the timepiece dial 1 can be made particularly excellent.
The opening 213 may be formed by any method, but is preferably formed by etching. As a result, when the opening 213 is formed, it is possible to reliably prevent the surface of the metal plate 21 from being unintentionally roughened, and the aesthetic appearance of the timepiece dial 1 is excellent and easy. Can be.

  The opening 213 has a cross-sectional area increasing portion 214 whose cross-sectional area increases from the first surface 211 side to the second surface 212 side of the metal plate 21. By having such a cross-sectional area increasing portion 214, it is possible to make the light transmitting property particularly excellent while improving the aesthetic appearance of the timepiece dial 1 as a whole. This is considered to be due to the following reasons.

  That is, since the metal plate 21 has the cross-sectional area increasing portion 214, compared to the case where the metal plate 21 does not have the cross-sectional area increasing portion 214, an oblique direction on the first surface 211 side (predetermined from the normal direction of the metal plate 21. Light incident from a direction inclined by an angle can be efficiently transmitted to the second surface 212 side. As a result, the light transmission as the timepiece dial 1 can be made superior to the case where the cross-sectional area increasing portion 214 is not provided. Further, compared with the case where the cross-sectional area increasing portion 214 is not provided, the light transmission as the timepiece dial 1 can be improved, so the size (width) of the opening 213, Even when the aperture ratio of the metal plate 21 is relatively small, it is possible to ensure sufficiently excellent light transmittance. In other words, since the cross-sectional area increasing portion 214 is provided, when the size of the opening 213 and the opening ratio of the metal plate 21 are reduced, sufficient light transmission can be ensured, and the timepiece character The aesthetic appearance of the plate 1 can be further improved.

  In addition, since the metal plate 21 has the cross-sectional area increasing portion 214, when the timepiece dial 1 is applied to a solar timepiece, the timepiece dial 1 is compared with the case where the cross-sectional area increasing portion 214 is not provided. It is possible to irradiate each part of the solar cell disposed on the back side (the side opposite to the observer side) with uniform intensity light. In this way, by irradiating each part of the solar cell with light having a uniform intensity, the variation in the irradiation intensity of the light at each part of the solar cell (when it is assumed that the total amount of light is equal) As compared with the case where the value is large, the power generation efficiency in the solar cell can be made excellent.

  Further, as will be described in detail later, the plastic plate 22 is disposed on the second surface 212 side of the metal plate 21. As described above, when the metal plate 21 has the cross-sectional area increasing portion 214 and the timepiece dial 1 includes the plastic plate 22, the following effects can be obtained. That is, a part of the light incident from the first surface 211 side, transmitted through the metal plate 21, and emitted from the second surface 212 side is part of the surface of the plastic plate 22 and the cross-sectional area of the metal plate 21. By repeating the reflection with the inclined surface forming the increasing portion 214, a part of the light is emitted to the observer side (the first surface 211 side of the metal plate 21). Thereby, as the whole timepiece dial 1, the presence of the opening 213 becomes inconspicuous, and the aesthetic appearance is very excellent. At the same time, another part of the light repeatedly reflected between the surface of the plastic plate 22 and the inclined surface is transmitted through the plastic plate 22. As described above, the light that has been repeatedly reflected between the surface of the plastic plate 22 and the inclined surface is transmitted through the plastic plate 22, so that the timepiece dial is compared with the case where the above reflection does not occur. When 1 is applied to a solar timepiece, each part of the solar cell disposed on the back side (the side opposite to the observer side) of the timepiece dial 1 is irradiated with light with a more uniform intensity. Can do. In this way, by irradiating each part of the solar cell with light having a uniform intensity, the variation in the irradiation intensity of the light at each part of the solar cell (when it is assumed that the total amount of light is equal) As compared with the case where the value is large, the power generation efficiency in the solar cell can be made excellent.

  As described above, in the timepiece dial of the present invention, the metal plate has a cross-sectional area increasing portion, and the timepiece dial has a plastic plate. The light transmission property can be made excellent, and the aesthetic appearance can be made excellent. Further, the light transmitted through the timepiece dial can be more effectively used for power generation in the solar cell. These effects synergistically act to provide a timepiece dial that can be suitably applied to a solar timepiece while having a very excellent aesthetic appearance.

In the opening 213 (the cross-sectional area increasing portion 214), the cross-sectional area of the cross-sectional area smallest unit 2141 sectional area is minimized, it is preferably from 70～32000Myuemu ^2, more preferably from 300～26000Myuemu ^2, More preferably, it is 1000-22000 μm ² . As a result, the light transmission of the timepiece dial 1 can be made particularly excellent while the aesthetic appearance of the timepiece dial 1 is sufficiently excellent. On the other hand, when the cross-sectional area at the cross-sectional area minimum portion 2141 is less than the lower limit value, the light transmittance tends to decrease. On the other hand, when the cross-sectional area at the cross-sectional area minimum portion 2141 exceeds the upper limit, the appearance of the timepiece dial 1 is sufficiently excellent depending on the shape of the cross-sectional area increasing portion 214, the constituent material of the metal plate 21, and the like. Can be difficult.

Further, in the opening 213 (cross-sectional area increasing portion 214), the cross-sectional area at the cross-sectional area minimum portion 2141 where the cross-sectional area is the minimum is S ₀ [μm ² ], and the cross-sectional area is the maximum at the cross-sectional area maximum portion 2142. When the cross-sectional area (the cross-sectional area of the opening 213 in the second surface 212 in the illustrated configuration) is S ₁ [μm ² ], the relationship of 0.15 ≦ S ₀ / S ₁ ≦ 0.98 is satisfied. More preferably, the relationship of 0.20 ≦ S ₀ / S ₁ ≦ 0.93 is satisfied, and the relationship of 0.30 ≦ S ₀ / S ₁ ≦ 0.90 is more preferably satisfied. By satisfying such a relationship, the light transmission of the timepiece dial 1 can be made particularly excellent while the aesthetic appearance of the timepiece dial 1 is sufficiently excellent. On the other hand, when the value of S ₀ / S ₁ is less than the lower limit value, the light transmission as the entire timepiece dial 1 is sufficiently excellent depending on the constituent material and thickness of the metal plate 21. It cannot be assumed. On the other hand, when the value of S ₀ / S ₁ exceeds the upper limit value, the appearance of the timepiece dial 1 is sufficiently excellent depending on the shape of the cross-sectional area increasing portion 214, the constituent material of the metal plate 21, and the like. Can be difficult.

The thickness of the cross-sectional area increasing portion 214 is not particularly limited, but is preferably 10 to 200 μm, more preferably 15 to 180 μm, and further preferably 20 to 150 μm. When the thickness of the cross-sectional area increasing portion 214 is a value within the above range, the light transmission property can be made particularly excellent while sufficiently improving the aesthetic appearance. On the other hand, if the thickness of the cross-sectional area increasing portion 214 is less than the lower limit value, it is difficult to make the appearance of the timepiece dial 1 sufficiently excellent depending on the constituent material of the metal plate 21 and the like. There is a possibility. On the other hand, when the thickness of the cross-sectional area increasing portion 214 exceeds the upper limit, depending on the constituent material of the metal plate 21 and the area of the opening 213 (the sum of the areas of the cross-sectional area minimum portion 2141 is Σ (S ₀ )) Therefore, it becomes difficult to make the light transmission of the timepiece dial 1 as a whole sufficiently excellent.

Further, the cross-sectional area increasing portion 214 is formed as an inclined surface that draws a parabola in a cross section in a direction perpendicular to the main surface of the metal plate 21. If the cross-sectional area increasing portion 214 has such a shape, the effect of having the cross-sectional area increasing portion 214 as described above is exhibited more significantly.
The width (W in the figure) of the cross-sectional area minimum portion 2141 is not particularly limited, but is preferably 10 to 200 μm, and more preferably 20 to 180 μm. When the width of the cross-sectional area minimum portion 2141 is a value within the above range, the texture specific to the metal material can be expressed more effectively, and the aesthetic appearance (luxury feeling) of the timepiece dial 1 is particularly excellent. In addition, the light transmission as the timepiece dial 1 can be made particularly excellent. On the other hand, when the width of the cross-sectional area minimum portion 2141 is less than the lower limit value, it is difficult to ensure sufficient light transmission. In addition, if the pitch of the cross-sectional area minimum portion 2141 is reduced in order to ensure light transmission, the presence of the opening 213 becomes conspicuous depending on the constituent material of the metal plate 21, the pitch of the cross-sectional area minimum portion 2141, and the like. It may be difficult to make the aesthetic appearance of the timepiece dial 1 sufficiently excellent. On the other hand, when the width of the cross-sectional area minimum portion 2141 exceeds the upper limit, the presence of the opening 213 becomes conspicuous depending on the constituent material of the metal plate 21, the opening ratio of the metal plate 21, and the like. It becomes difficult to make the aesthetic appearance sufficiently excellent. In addition, when the cross-sectional area minimum portion 2141 has a substantially circular shape when viewed in plan, the diameter is the width W of the cross-sectional area minimum portion 2141 and when the cross-sectional area minimum portion 2141 is viewed in plan In the case of showing an elliptical shape, the length in the minor axis direction can be set as the width W of the cross-sectional area minimum portion 2141.

  Moreover, it is preferable that it is 15-350 micrometers, and, as for the pitch (P in a figure) of the opening part 213, it is more preferable that it is 30-250 micrometers. When the pitch of the openings 213 is a value within the above range, the texture specific to the metal material can be expressed more effectively, and the aesthetic appearance (luxury feeling) of the timepiece dial 1 is particularly excellent. In addition, the light transmission as the timepiece dial 1 can be made particularly excellent. On the other hand, if the pitch of the openings 213 is less than the lower limit value, the presence of the openings 213 becomes conspicuous depending on the constituent material of the metal plate 21 and the width of the minimum cross-sectional area 2141, and the timepiece dial. It becomes difficult to make the aesthetic appearance of 1 sufficiently excellent. On the other hand, when the pitch of the openings 213 exceeds the upper limit, it is difficult to ensure sufficient light transmission. In addition, if the width of the opening 213 is increased in order to ensure light transmission, the presence of the opening 213 is conspicuous depending on the constituent material of the metal plate 21, the width of the opening 213, and the like. It may be difficult to make the aesthetic appearance of the plate 1 sufficiently excellent. The pitch of the openings 213 refers to the center-to-center distance between the adjacent openings 213-213. When there are a plurality of adjacent openings 213, the pitch between the adjacent openings 213 is the same. Refers to the distance between centers.

The area ratio (opening ratio of the metal plate 21) occupied by the opening 213 when the metal plate 21 is viewed in plan, that is, the area of the metal plate 21 when the metal plate 21 is viewed in plan is S [μm ² ], and each opening When the sum of the areas of the cross-sectional area minimum part 2141 for the part 213 is Σ (S ₀ ) [μm ² ], the value represented by (Σ (S ₀ ) / S) × 100 is 10 to 60%. It is preferably 20 to 40%, more preferably 27 to 38%. When the aperture ratio of the metal plate 21 is a value within the above range, the texture unique to the metal material can be expressed more effectively, and the aesthetic appearance (luxury feeling) of the timepiece dial 1 is particularly excellent. In addition, the light transmission as the timepiece dial 1 can be made particularly excellent. On the other hand, when the aperture ratio of the metal plate 21 is less than the lower limit, it becomes difficult to make the light transmission of the timepiece dial 1 sufficiently excellent. On the other hand, when the aperture ratio of the metal plate 21 exceeds the upper limit, the presence of the opening 213 is noticeable depending on the width of the opening 213 and the like, and the aesthetic appearance of the timepiece dial 1 is sufficiently excellent. It becomes difficult to do.

In the illustrated configuration, the metal plate 21 has a cross-sectional area increasing portion 214 on the second surface 212 side, and an area closer to the first surface 211 side than the cross-sectional area increasing portion 214 (an area including the first surface 211). ) Has a cross-sectional area decreasing portion 215 in which the cross-sectional area decreases from the first surface 211 side to the second surface 212 side of the metal plate 21.
Thus, by having the cross-sectional area decreasing part 215 on the first surface 211 side with respect to the cross-sectional area increasing part 214, the first surface 211 side is inclined by a predetermined angle from the normal direction of the metal plate 21. Light incident from the direction of the second surface 212 can be efficiently transmitted to the second surface 212 side. As a result, the light transmission as the timepiece dial 1 can be made particularly excellent. Further, since the light transmission as the timepiece dial 1 can be made excellent, even when the size (width) of the opening 213 and the aperture ratio of the metal plate 21 are relatively small. Therefore, it is possible to ensure a sufficiently excellent light transmittance. In other words, by having the cross-sectional area decreasing portion 215, when the size of the opening 213 and the opening ratio of the metal plate 21 are reduced, sufficient light transmission can be ensured, and for a watch The aesthetic appearance of the dial 1 can be further improved. In addition, light from the observer side can be diffusely reflected on the inclined surface forming the cross-sectional area reducing portion 215, whereby the aesthetic appearance of the timepiece dial 1 can be further improved.

[Plastic plate]
On the second surface 212 side of the metal plate 21, a plastic plate 22 mainly composed of a plastic material is disposed.
As described above, the timepiece dial 1 is made to transmit light by the synergistic effect of the plastic plate 22 being disposed on the second surface 212 side of the metal plate 21 and the cross-sectional area increasing portion 214. It can be made excellent in aesthetic appearance. Moreover, the light which permeate | transmitted the timepiece dial 1 can be utilized more effectively for the electric power generation in a solar cell. And, by these effects acting synergistically, the timepiece dial 1 can have a very excellent aesthetic appearance and can be suitably applied to a solar timepiece.

  The plastic plate 22 is not particularly limited as long as it has optical transparency, but the transmittance of light in the visible light region (wavelength region of 380 to 780 nm) is preferably 50% or more, and 80% or more. More preferably. Thus, when the light transmission of the plastic plate 22 is high, the light transmission of the timepiece dial 1 as a whole can be made particularly excellent, and the aesthetic appearance of the timepiece dial 1 can be improved. It can be made particularly excellent. As the light transmittance, for example, a value measured using a white fluorescent lamp (manufactured by Hitachi Lighting Co., Ltd., FL15N-B (high white)) can be adopted as the light source.

  Examples of the plastic material constituting the plastic plate 22 include various thermoplastic resins and various thermosetting resins. For example, polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS resin), 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 polymer alloys mainly containing these resins These can be used, and one or more of these can be used in combination (for example, as a blend resin, polymer alloy, laminate, etc.). In particular, it is preferable that the plastic plate 22 is mainly composed of polycarbonate. 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 plastic plate 22 is increased (easiness of molding is improved), even the timepiece dial 1 having a more complicated shape can be easily and reliably manufactured. Further, if the plastic plate 22 is made of polycarbonate, it is possible to reliably prevent the metal material constituting the metal plate 21 from being deteriorated in texture, and the aesthetic appearance of the timepiece dial 1 is particularly excellent. Can be. Polycarbonate is relatively inexpensive among various plastic materials, and can contribute to further reduction in production cost of the timepiece dial 1.

  The plastic plate 22 may include components other than the 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 plastic plate 22 is made of a material containing a colorant, variations in the color of the timepiece dial 1 can be expanded.

The plastic plate 22 may have a substantially uniform composition at each site, or may have a different composition depending on the site.
Although the thickness of the plastic board 22 is not specifically limited, It is preferable that it is 50-500 micrometers, It is more preferable that it is 100-450 micrometers, It is further more preferable that it is 180-430 micrometers. When the thickness of the plastic plate 22 is within the above range, the aesthetic appearance of the timepiece dial 1 can be made sufficiently excellent, and the light transmittance can be made particularly excellent. On the other hand, when the thickness of the plastic plate 22 is less than the lower limit, it is difficult to efficiently reflect light between the surface of the plastic plate 22 and the inclined surface, and the aesthetic appearance of the timepiece dial 1 is obtained. Appearance tends to decrease. Further, depending on the thickness of the metal plate 21, the thickness of the timepiece dial 1 as a whole may be too thin, and it may be difficult to apply the timepiece dial 1 to an existing movement. On the other hand, when the thickness of the plastic plate 22 exceeds the upper limit, it may be difficult to make the light transmission of the timepiece dial 1 as a whole sufficiently excellent.

  In the present embodiment, the plastic plate 22 is installed so as to be separated from the metal plate 21 by a predetermined distance. With such a configuration, light can be more efficiently reflected between the surface of the plastic plate 22 and the inclined surface, and the aesthetic appearance of the timepiece dial 1 is particularly excellent. In addition, it is possible to irradiate light of uniform intensity by each part of the solar cell arranged on the back side of the timepiece dial 1, and to make the power generation efficiency in the solar cell particularly excellent. it can. In particular, in the present embodiment, the spacer 23 is interposed between the metal plate 21 and the plastic plate 22 so that the separation distance between the metal plate 21 and the plastic plate 22 is maintained.

[spacer]
The spacer 23 may be any one provided between the metal plate 21 and the plastic plate 22, but in this embodiment, the second surface 212 of the metal plate 21 and the main surface of the plastic plate (on the metal plate 21). It is selectively provided in the vicinity of the outer peripheral portion of the facing surface. As a result, when the timepiece dial 1 is applied to a timepiece by a bezel or dial ring (parting ring, turnout ring) or the like that the timepiece normally has, the spacer 23 is visually recognized by the user or the like. Can be reliably prevented. As a result, the aesthetic appearance of the timepiece to which the timepiece dial 1 is applied can be reliably improved.

  The thickness of the spacer 23 (that is, the distance between the metal plate 21 and the plastic plate 22) is not particularly limited, but is preferably 10 to 300 μm, and more preferably 20 to 200 μm. When the thickness of the spacer 23 (the distance between the metal plate 21 and the plastic plate 22) is a value within the above range, the light is more efficiently reflected between the surface of the plastic plate 22 and the inclined surface. The timepiece dial 1 can be made to have a particularly excellent aesthetic appearance, and light of uniform intensity is irradiated by each part of the solar cell disposed on the back side of the timepiece dial 1. The power generation efficiency of the solar cell can be made particularly excellent.

  The spacer 23 may be any material as long as it has a function of maintaining a separation distance between the metal plate 21 and the plastic plate 22, but is composed of an adhesive material (adhesive). Is preferred. When the spacer 23 is made of an adhesive material, the metal plate 21 and the plastic plate 22 can be easily and reliably fixed by sticking. In addition, since the adhesive is generally an elastic material, it is effective that the metal plate 21 and the plastic plate 22 are separated even when an impact force is applied to the timepiece dial 1 by dropping or the like. Can be prevented. Examples of the adhesive material constituting the spacer include various adhesives such as an acrylic adhesive.

[index]
An index 3 is provided on the first surface 211 side of the metal plate 21. Examples of such an index 3 include letters and numbers (so-called time letters and the like), scales, symbols, various marks, and the like having a function of indicating time and the like. By providing such an index 3, the aesthetic appearance of the timepiece dial can be made particularly excellent.

  In the illustrated configuration, the index 3 is provided on the first surface of the metal plate 21. For example, the index 3 has a foot, and the foot is inserted into the metal plate 21. A hole or a recess to be fixed may be provided. With such a configuration, the adhesion between the index 3 and the metal plate 21 can be made particularly excellent, and the durability of the timepiece dial 1 can be made particularly excellent. Further, the height of the index 3 can be easily made relatively high, and the stereoscopic effect of the index 3 can be made excellent.

<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 parts other than the timepiece dial (the timepiece dial of the present invention) constituting the timepiece of the present invention, known parts can be used. An example of the configuration of the timepiece of the present invention will be described below. .

FIG. 3 is a cross-sectional view showing a preferred embodiment of the timepiece (watch) of the present invention.
As shown in FIG. 3, a wristwatch (portable watch) 100 according to the present embodiment includes a case (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 surface side on which the index 3 of the plastic plate 22 is provided is the glass plate (cover glass) 85 side ( It is arranged to face the outer surface side).
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. 3, 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, a crystal oscillation 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.

  As described above, in the timepiece dial 1, the metal plate 21 has the cross-sectional area increasing portion 214 and the timepiece dial 1 has the plastic plate 22, thereby transmitting light. In addition to being able to have excellent properties, the aesthetic appearance can also be improved. Further, the light transmitted through the timepiece dial 1 can be used more effectively for power generation in the solar cell 94.

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 sealed in a liquid-tight manner to obtain a waterproof function. 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) is described as an example of a clock, but the present invention is similarly applied to other types of clocks such as a portable clock, a table clock, and a wall clock other than the wristwatch. be able to.

As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to these.
For example, 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.
In the above-described embodiment, the spacer is interposed between the metal plate and the plastic plate. However, the metal plate and the plastic plate may be in direct contact with each other.

In the above-described embodiment, the metal plate has been described as having a cross-sectional area decreasing portion in addition to the cross-sectional area increasing portion. However, in the present invention, the metal plate has a reduced cross-sectional area as shown in FIG. It is not necessary to have a part.
In the above-described embodiment, the timepiece of the present invention has been described as including a timepiece dial having a metal plate provided with an opening and a plastic plate. However, the timepiece of the present invention is as described above. The metal plate provided with the opening and the plastic plate as described above may be provided as separate members.

Next, specific examples of the present invention will be described.
1. Manufacture of a timepiece dial A timepiece dial (watch dial) was manufactured for each example and each comparative example by the following method.
Example 1
First, a metal plate (600 mm × 300 mm × thickness 100 μm) made of stainless steel (SUS304) was prepared.

Next, a mask forming film was coated on the surface of the metal plate (main surfaces on both sides).
The mask forming film was formed by coating the surface of the metal plate using a spin coater under the condition of a rotational speed of 3000 rpm and then drying at 70 to 100 ° C. for 20 minutes. The average thickness of the formed mask forming film was about 10 μm.
Next, an opening having a predetermined pattern was formed in the mask forming film to obtain a mask having an opening. The opening was formed in the mask forming film by exposure. An ultra-high pressure mercury lamp was used as the light source. At this time, laser light was intermittently irradiated while relatively moving the light source and the base material. Irradiation from the light source was performed under the condition of a light amount of 100 mJ / cm ² . At this time, when the metal plate is viewed in plan, the opening of the mask provided on one main surface of the metal plate overlaps with the opening of the mask provided on the other main surface of the metal plate. Then, an opening was formed in each mask forming film.

  Next, an opening was formed in the metal plate by etching using an etching solution. Etching was performed by immersing a metal plate covered with a mask in an etching solution. The temperature of the etching solution and the etching time in this step were about 20 ° C. and about 5 minutes, respectively. Thereby, a large number of circular openings penetrating the metal plate were formed in a staggered pattern (see FIG. 2). In addition, the opening formed in this manner has a cross-sectional area increasing portion provided as an inclined surface that draws a parabola on the second surface side, and draws a parabola on the first surface side. It had a cross-sectional area reduction | decrease part provided as an inclined surface (refer FIG. 1).

Next, the mask was removed by immersing in a mask remover composed of a sodium hydroxide solution to obtain a metal plate provided with openings. Moreover, the temperature of the mask removing agent and the immersion time in the mask removing agent in this step were 30 to 40 ° C. and 5 to 10 minutes, respectively. The pitch P of the openings of the metal plate was 255 μm, and the width (diameter) W of the minimum cross-sectional area was 160 μm. Moreover, the aperture ratio of the metal plate was 35.7%. For each opening, the cross-sectional area S ₀ at the minimum cross-sectional area was 2.0 × 10 ⁴ μm ² . In the cross-sectional area increasing portion, the cross-sectional area at the minimum cross-sectional area where the cross-sectional area is minimum is S ₀ [μm ² ], and the cross-sectional area at the maximum cross-sectional area where the cross-sectional area is maximum is S ₁ [μm ² ], The value represented by S ₀ / S ₁ was 0.44. Moreover, the thickness of the cross-sectional area increasing portion was 50 μm, and the thickness of the cross-sectional area decreasing portion was 50 μm.

Thereafter, a metal plate having an opening was formed by punching, and a necessary portion was cut and polished to obtain a large number of metal plates having a diameter of 27 mm × thickness: 100 μm.
On the other hand, a substantially disk-shaped plate material was produced by compression molding using polycarbonate, and then necessary portions were cut and polished. As a result, a plastic plate having a substantially disk shape with a diameter of 27 mm and a thickness of 400 μm was obtained.

Next, an index was formed on one main surface of the metal plate in which the opening was formed by an inkjet method.
Next, the metal plate provided with the opening as described above and provided with the index was joined to the plastic plate using a spacer composed of an acrylic adhesive. At this time, the plastic plate was arranged so that the surface opposite to the surface on which the index was provided was opposed to the metal plate. As the spacer, a ring-shaped adhesive sheet (outer diameter: 27 mm × inner diameter: 26 mm × thickness: 50 μm) was used. As a result, a timepiece dial as shown in FIGS. 1 and 2 was obtained.

(Examples 2-9)
The thickness of the metal plate constituent material, plastic plate constituent material, metal plate, plastic plate and spacer is shown in Table 1, and the formation conditions of the opening (size of the opening formed in the mask forming film) The timepiece dial was manufactured in the same manner as in Example 1 except that the opening conditions of the metal plate were changed as shown in Table 1 by changing the etching conditions such as the arrangement pattern. In Examples 4, 5, 7, and 8, the openings were formed by laser processing.
(Example 10)
A watch dial was manufactured in the same manner as in Example 1 except that a metal plate provided with an opening and provided with an index and a plastic plate were directly joined without using a spacer.

(Comparative Example 1)
A timepiece dial was manufactured in the same manner as in Example 1 except that a metal plate that was not provided with an opening was used as a metal plate to be joined to the plastic plate using a spacer.
(Comparative Example 2)
Except that the indicator was formed on the surface of the metal plate by the ink jet method under the same conditions as those performed on the plastic plate in Example 1, and the metal plate was not joined to the spacer and the plastic plate. A watch dial was manufactured in the same manner as in Comparative Example 1. That is, the timepiece dial of this comparative example is not provided with a spacer and a plastic plate, and is provided with an index directly on the surface of the metal plate having no opening as described above.

(Comparative Example 3)
Similar to Example 1 except that an index was formed on the surface of the metal plate by an ink jet method under the same conditions as in Example 1 and this metal plate was not joined to a spacer or a plastic plate. A dial for a watch was manufactured. That is, the timepiece dial of this comparative example is not provided with a spacer and a plastic plate, but is provided with an index directly on the surface of a metal plate having an opening.

(Comparative Example 4)
A timepiece dial was manufactured in the same manner as in Example 1 except that the opening was formed on the metal plate by lathe processing instead of etching. The opening formed by lathe processing did not have a cross-sectional area increasing portion and a cross-sectional area decreasing portion.
Table 1 summarizes the configuration of the timepiece dial of each example and each comparative example. In the table, polycarbonate was indicated by PC, and acrylonitrile-butadiene-styrene copolymer (ABS resin) was indicated by ABS. In addition, the plastic plate which comprises the dial for timepieces of each Example and each comparative example is calculated | required by the measurement using a white fluorescent lamp (Hitachi Lighting Co., Ltd. product, FL15N-B (high white)) as a light source. The transmittance of light in the visible light region was 95% or more. In Table 1, the width W column of Comparative Example 4 shows the value of the width of the opening having a certain width.

2. Appearance evaluation Each watch dial plate manufactured in each of the above examples and comparative examples was visually observed from the surface side where the index portion is arranged, and these appearances were evaluated according to the following six-stage criteria. did.
A: It has an extremely excellent appearance.
B: It has an excellent appearance.
C: It has a good appearance.
D: Appearance is slightly poor.
E: Appearance is poor.
F: The appearance is extremely poor.

3. Evaluation of Light (Visible Light) Transmittance (Light Utilization Efficiency) of Timepiece Dials For each timepiece dial manufactured in each of the examples and comparative examples, light transmittance (light Usage efficiency) was evaluated.
First, the solar cell and each clock dial were placed in a dark room. Thereafter, light from a fluorescent lamp (light source) separated by a predetermined distance was made incident on the light receiving surface of the solar cell alone. At this time, the power generation current of the solar cell was A [mA]. Next, light from a fluorescent lamp (light source) separated by a predetermined distance as described above was made incident on the upper surface of the light receiving surface of the solar cell in a state where the timepiece dial was overlapped. In this state, the generated current of the solar cell was B [mA]. Then, a value represented by (B / A) × 100 was calculated, and evaluated according to the following seven criteria. It can be said that the larger the value of (B / A) × 100, the better the light transmittance (light utilization efficiency) of the timepiece dial. Note that the timepiece dial was overlapped so that the surface side on which the indicator portion is arranged faces the fluorescent lamp (light source) side. Further, as a white fluorescent lamp, FL15N-B (High White) manufactured by Hitachi Lighting Co., Ltd. was used.

A: 34% or more.
B: 30% or more and less than 34%.
C: 26% or more and less than 30%.
D: 23% or more and less than 26%.
E: 20% or more and less than 23%.
F: 12% or more and less than 20%.
G: Less than 12%.

  Thereafter, a watch as shown in FIG. 3 was manufactured by using the timepiece dial manufactured in each of the above Examples and Comparative Examples. Then, each manufactured wristwatch was put in a dark room. Thereafter, light from a fluorescent lamp (light source) spaced a predetermined distance was made incident from a surface on the dial side (surface on the glass plate) of the watch. At this time, the irradiation intensity was changed at a constant speed so that the irradiation intensity of light gradually increased. As a result, in the timepiece of the present invention, the movement was driven even when the irradiation intensity was relatively small. On the other hand, in the watches of Comparative Examples 1 and 2, the movement was not confirmed even when the irradiation intensity was relatively high. Further, although the movement of the movement was confirmed in the timepiece of Comparative Example 3, the intensity of light required for driving the movement was higher than that of the timepieces of the respective embodiments (the present invention).

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 watch internal module (movement) and a watch dial were assembled in the watch case, and the radio wave reception sensitivity in this state was measured.
Using the reception sensitivity in a state where the timepiece dial is not incorporated as a reference, the reduction amount (dB) of the reception sensitivity when the timepiece 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 timepiece dial is. Note that the timepiece dial was overlapped so that the surface side on which the indicator portion is arranged faces the outer surface side.
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.
These results are shown in Table 2.

As is clear from Table 2, all of the timepiece dials of the present invention were excellent in aesthetic appearance and light transmittance (light utilization efficiency). In addition, all of the timepiece dials of the present invention were excellent in radio wave transmission. From this, it can be seen that the timepiece dial of the present invention can be suitably applied to a solar timepiece and a radio timepiece.
On the other hand, in the comparative example, a satisfactory result was not obtained. That is, the timepiece dials of Comparative Examples 1 and 2 using a metal plate having no opening are very inferior in light transmittance and do not substantially transmit light (visible light). . Moreover, in the timepiece dial of Comparative Example 3 that does not have a plastic plate, although the metal plate has an opening, the presence of the opening is conspicuous, and a sufficiently excellent aesthetic appearance cannot be obtained. . In addition, the timepiece dial of Comparative Example 3 was not provided with a plastic plate, so that the light transmittance was inferior to that of the timepiece dial of the present invention. This is considered to be because in the timepiece dial of Comparative Example 3, no reflection occurs between the plastic plate and the metal plate. Moreover, in the comparative example 4 which formed the opening part which does not have a cross-sectional area increase part by lathe processing, the light transmittance was inferior compared with the dial for timepieces of this invention. Further, in the timepiece dial of Comparative Example 4, the presence of the opening portion was conspicuous, and a sufficiently excellent aesthetic appearance could not be obtained.
Further, a timepiece as shown in FIG. 3 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.

It is a longitudinal cross-sectional view which shows suitable embodiment of the dial for timepieces of this invention. It is a typical top view for demonstrating an example of the shape (pattern) of the opening which a metal plate has. It is sectional drawing which shows suitable embodiment of the timepiece (watch) of this invention. It is a longitudinal cross-sectional view which shows other suitable embodiment of the timepiece dial of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Timepiece dial 2 ... Dial plate main body 21 ... Metal plate 211 ... 1st surface 212 ... 2nd surface 213 ... Opening part 214 ... Cross-sectional area increase part 2141 ... Cross-sectional area minimum part 2142 ... Cross-sectional area maximum part 215 ... Cross-sectional area reduction part 22 ... Plastic plate 23 ... Spacer 3 ... Indicator 81 ... Movement 82 ... Body (case) 83 ... Back cover 84 ... Bezel (edge) 85 ... Glass plate (cover glass) 86 ... Makishin pipe 87 ... Ryu Numeral 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) 94 ... Solar cell 100 ... Watch ( Mobile watch)

Claims (14)

A plastic plate mainly composed of plastic material;
Provided on the observer side than the plastic plate, comprising a metal plate mainly composed of a metal material,
The metal plate is provided with an opening penetrating in the thickness direction,
The opening increases in cross-sectional area from the first surface, which is the main surface on the observer side, of the metal plate toward the second surface, which is the main surface facing the plastic plate. A timepiece dial having a cross-sectional area increasing portion.   The timepiece dial according to claim 1, wherein the metal plate has a thickness of 10 to 300 μm.   3. The timepiece dial according to claim 1, wherein a width of the opening at a minimum cross-sectional area where the cross-sectional area is minimum in the cross-sectional area increasing portion is 10 to 200 μm.   The timepiece dial according to any one of claims 1 to 3, wherein an area ratio occupied by the opening when the metal plate is viewed in plan is 10 to 60%. The cross-sectional area at the cross-sectional area minimum portion where the cross-sectional area is the smallest in the cross-sectional area increasing portion is S ₀ [μm ² ], and the cross-sectional area is maximized at the cross-sectional area where the cross-sectional area is maximum. 5. The timepiece dial according to claim 1, wherein when the area is S ₁ [μm ² ], a relationship of 0.15 ≦ S ₀ / S ₁ ≦ 0.98 is satisfied.   The timepiece dial according to claim 1, wherein the cross-sectional area increasing portion has a thickness of 10 to 200 μm.   The timepiece dial according to claim 1, wherein the metal plate is mainly made of Ti, a Ti alloy, or stainless steel. The metal plate is provided with a plurality of openings.
The timepiece dial according to any one of claims 1 to 7, wherein the openings are arranged in a staggered pattern when the metal plate is viewed in plan.   The timepiece dial according to claim 1, wherein the plastic plate has a thickness of 50 to 500 μm.   The timepiece dial according to claim 1, wherein an indicator is provided on the first surface side of the metal plate.   The timepiece dial according to any one of claims 1 to 10, wherein the metal plate and the plastic plate are separated by a predetermined distance.   The timepiece dial according to claim 11, wherein a distance between a surface of the metal plate facing the plastic plate and a surface of the plastic plate facing the metal plate is 10 to 300 μm.   A timepiece comprising the timepiece dial according to claim 1. A watch comprising a movement and a cover glass disposed on the outer surface side of the movement,
A plastic plate mainly composed of a plastic material is disposed between the movement and the cover glass,
Between the plastic plate and the cover glass, a metal plate mainly composed of a metal material is disposed,
The metal plate is provided with an opening penetrating in the thickness direction,
The opening is cut from the first surface, which is the main surface facing the cover glass, of the metal plate toward the second surface, which is the main surface facing the plastic plate. A timepiece having a cross-sectional area increasing portion having an increased area.

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