JP5190136B2 - Clock face with solar cell - Google Patents

Description

  The present invention relates to a timepiece dial, and to a timepiece dial with a solar cell.

  The solar cell timepiece dial transmits the received light and causes a solar cell (solar cell) disposed on the lower surface thereof to generate a power generation function. Since a timepiece dial with a solar cell is required to transmit light, a plastic material has been conventionally used in many cases. In addition to providing light transmission properties, the plastic material has advantages such as low cost and easy decoration such as painting and printing.

  Generally, as shown in the plan view of FIG. 10, a solar cell used for a portable watch is provided on four surfaces (A1, A2, A3, A4) divided into four equal parts and arranged on the lower surface of the dial. Established. Then, the transmitted light that has passed through the dial is incident on each of the four surfaces (A1, A2, A3, A4) in a uniform amount, and the power generation efficiency is most enhanced. Therefore, the dial arranged on the upper surface side of the solar cell is a portion corresponding to the four surfaces (A1, A2, A3, A4) of the solar cell, that is, the 12-6 hour line and the 9-3 hour line. It is necessary to design the four equally divided surfaces so as to transmit a uniform amount of light respectively.

  In recent years, a solar cell having a very high photoelectric conversion efficiency has appeared, and a solar cell capable of sufficiently driving a portable timepiece even with a transmittance of 15% or 20% has appeared. In addition, it has become possible to reduce the size of the solar cell, and a solar cell that can be driven sufficiently even with a size of 10 mm square has appeared.

  However, this solar cell has a unique dark purple color. In addition, the crosshairs that are divided into four equal parts are very conspicuous due to the difference in materials. For this reason, since it does not give an aesthetically pleasing feeling, various methods have been conventionally applied to the dial in order to soften or hide this dark purple color. As one of the techniques, there is a technique disclosed in Patent Document 1 below.

  FIG. 11 shows a partially enlarged cross-sectional view of a display panel structure for a watch with solar cell according to one embodiment shown in Patent Document 1. In FIG. According to this, B is a display plate, and the display plate B is integrally provided on the upper surface of the solar cell 11.

  The display board B here is composed of a display substrate 12, a phosphorescent phosphor layer 13, and a surface protective coating layer 14, and a time character 15 is provided thereon. The display substrate 12 is made of a transparent resin plate such as acrylic resin or polycarbonate resin, and the phosphorescent phosphor layer 13 is a light diffusing agent and a persistence type phosphorescent material that functions as a coloring agent / light diffusing agent to a binder made of a transparent resin. It consists of a coating film mixed with a fluorescent material. As the light diffusing agent, silicic acid powder, calcium carbonate powder, calcium phosphate powder and the like are used, and those having a particle diameter of 5 to 15 μm are kneaded in the range of 3 to 18% by weight with respect to the phosphor phosphor powder. Has been. The phosphorescent phosphor has long persistence, and 100 parts by weight is blended with 35 to 65 parts by weight of the binder. The surface protective coating layer 14 is formed to prevent deterioration of the phosphorescent phosphor, and is formed by a method such as printing using a resin such as a transparent acrylic resin, urethane resin, or epoxy resin. Further, the time character 15 is provided by being attached by an adhesive formed by printing or electroforming.

  As an effect of taking the above configuration, the reflected light from the solar cell is absorbed by the phosphorescent phosphor with the light diffusing agent and the afterglow type phosphorescent phosphor functioning as a coloring imparting / light diffusing agent, Since it diffuses and disperses with a diffusing agent, the dark purple color of the solar cell is erased and the color of the solar cell is not visually recognized. Moreover, it is supposed that the viewer can visually recognize the color tone (white color tone) of the phosphorescent phosphor.

  FIG. 12 is an enlarged partial cross-sectional view of a watch panel with a solar cell according to another embodiment disclosed in Patent Document 1. The display board B here includes a display substrate 22 made of a transparent resin containing a light diffusing agent, a reflective layer 23 formed on the back surface of the display substrate 22, and a minute uneven portion 24 formed on the surface 22 a of the display substrate 22. It is composed of The display substrate 22 is formed by injection molding by blending 0.5 to 10% by weight of a light diffusing agent with a transparent resin such as acrylic resin or polycarbonate. As the light diffusing agent, silicic acid powder, calcium carbonate powder, calcium phosphate powder or the like having a particle diameter of 5 to 15 μm is used. Further, it is said that the minute uneven portion 24 may be formed by transfer, machining, chemical processing, or the like from a mold during molding. The reflective layer 23 is formed by a vapor deposition method using a metal having a high reflectance.

  And by taking such a structure, a part of incident light from an upper surface permeate | transmits the display substrate 22 and the reflection layer 23, and injects into a solar cell. On the other hand, a part of the reflected light from the solar cell is transmitted through the reflective layer 23, but the dark purple color of the solar cell is erased by the light diffusion action of the display substrate 22. Further, since the diffusing agent and the reflective layer 23 function as a color imparting agent, it is supposed that the milky white color tone and the color tone of the reflective layer 23 are mixed and a delicate color is recognized by the viewer.

JP-A-9-243759

  However, a structure in which a phosphorescent phosphor layer in which a diffusing agent and a phosphorescent phosphor are dispersed on a transparent display substrate has a white color tone due to the phosphor, but the surface of the display board becomes white and bright. However, it was not satisfactory enough for whiteness and clarity. In addition, in the case of a structure in which a diffusing agent is dispersed on a display substrate, a minute unevenness is provided on the surface, and a reflective layer is provided on the lower surface of the substrate, a film of the reflective layer to be formed is necessary because of the necessity of securing a required transmittance The thickness was limited and the display panel was only slightly colored, and the brightness and clearness of the display panel surface were not satisfactory.

  The present invention has been made in view of the above problems, and the object of the present invention is to make the surface of the dial bright and clear, or to increase the whiteness and to make the color more clear. It is to enhance the appearance beauty and values.

As a means for achieving the above object, the timepiece dial with a solar cell of the present invention is characterized in that in the timepiece dial with solar cell having a solar cell on the lower surface side, the timepiece dial has a prism reflecting surface on the lower surface. a transparent dial provided, possess a semi-transmissive reflective plate provided on the lower surface side of the transparent dial, constructed with a metal plate having a plurality of permeable openings semi-transmissive reflective plate It is a feature.

The characteristic of the solar cell with the timepiece dial of the present invention are those wherein the kite is provided a pattern pattern layer of irregularities on the upper surface of the transparent dial.

  As an effect of the present invention, a timepiece dial with a solar cell has a configuration in which a translucent dial plate provided with a prism on the lower surface and a transflective plate provided on the lower surface of the translucent dial plate, The amount of light reflected from the prism surface becomes very large. Further, the light passes through the prism surface, passes through the semi-transmissive reflector, and the light reaches the solar cell. Some of the light that arrives is reflected. The amount of light reflected from the solar cell passes through the transflective plate and is transmitted, refracted, and dispersed by the prism surface. Also, the reflected light reflected by the transflective plate with light from the outside is transmitted, refracted, and dispersed by the prism surface. As a result, light that is significantly dispersed and scattered is emitted from the transparent dial, so that the dark purple color tone of the solar cell disappears, and a white color appears on the transparent dial. And the display of the timepiece dial is brightly and clearly visible. Note that the transflective plate transmits the amount of light necessary for power generation of the solar cell, so that it does not hinder the power generation of the solar cell.

  In addition, when a concavo-convex pattern layer is provided on the upper surface of the transparent dial, the concavo-convex pattern is bright and clearly visible, and a timepiece dial having a high decorative property can be obtained. Moreover, the variation of a decoration can be increased by providing various uneven | corrugated pattern pattern layers. Furthermore, the uneven pattern causes light reflection, dispersion, and scattering, which further erases the color of the solar cell and increases whiteness, thereby producing an effect of making the uneven pattern clear.

  Further, when the transflective plate is formed of a reflective polarizing plate, a glossy gold color tone or silver color tone reflected light can be obtained, so that a noble metal color appears on the dial. Moreover, when it is formed with a sheet provided with a metal thin film, a dial plate with a slightly metallic color is obtained, and when it is formed with a metal plate provided with a plurality of transparent openings, various metal colors are obtained, and the pattern is also obtained. Can be provided.

  Further, when the first permeable decorative film and the second permeable decorative film are white films, the whiteness of the dial increases and brightness and clearness increase.

  Further, when a fine powder such as pearl, shellfish, mica, titanium metal, or silicon oxide is dispersed in the transparent film or the first transparent decorative film provided on the transparent dial, the fine powder becomes a glittering material and glitters. Shining, the decorativeness increases and a sense of luxury appears.

  In addition, when the first permeable decorative film is formed of shellfish, resin, glass, ceramic, or a metal having a plurality of permeable openings, decoration unique to each member can be applied. For example, if it is made of shells, it is possible to obtain a decoration in which a shine pattern unique to the shells appears, and if it is made of metal, it provides a metallic feeling and provides various effects to enhance the decorativeness. In addition, when sapphire glass or ceramic is used, a high-class feeling also appears.

It is a top view of the portable timepiece using the dial for timepieces with a solar cell concerning the embodiment of the present invention. It is principal part sectional drawing of the portable timepiece in FIG. It is principal part sectional drawing of the dial for timepieces with a solar cell in FIG. It is explanatory drawing of the reflective polarizing plate used for the transflective board in FIG. It is explanatory drawing explaining the effect | action of the dial for timepieces with a solar cell in FIG. The top view and principal part sectional drawing of the dial for timepieces with a solar cell which concern on Example 1 of this invention are shown, (a) of FIG. 6 is a top view, (b) of FIG. 6 is principal part sectional drawing. . It is principal part sectional drawing of the timepiece dial which concerns on Example 2 of this invention. It is principal part sectional drawing of the timepiece dial which concerns on Example 3 of this invention. It is principal part sectional drawing of the timepiece dial which concerns on Example 4 of this invention. It is a top view of the solar cell generally used for a portable timepiece. It is the elements on larger scale of the display board structure for timepieces with a solar cell of one Example shown by patent document 1. FIG. It is the partial cross-section enlarged view of the display plate for timepieces with a solar cell in the other Example shown by patent document 1. FIG.

  The best mode for carrying out the present invention will be described below with reference to FIGS. Here, FIG. 1 is a plan view of a portable timepiece using the timepiece dial with solar cell according to the embodiment of the present invention, and FIG. 2 is a cross-sectional view of the main part in FIG. FIG. 3 shows a cross-sectional view of the main part of the dial for timepiece with solar cell in FIG. 4 is an explanatory view of a reflective polarizing plate used for the transflective plate in FIG. 3, and FIG. 5 is an explanatory view for explaining the operation of the timepiece dial with solar cell in FIG.

  1 and 2, the portable timepiece 30 of the present invention is integrally provided in a case 31 on a transmissive dial 41, a transflective plate 47, a movement 38, and a movement 38 through an inner frame 37. A solar cell 39 is provided. The movement 38 has a pointer shaft projecting to the upper surface side of the transparent dial 41, and a long needle and a short hand pointer 34 are attached to the tip of the movement shaft. A cover glass 32 is fixed to the case 31 so as to cover them. Further, a back cover 36 is fixed to the back side, and a band 33 is attached to a fitting portion of the case 31. A crown 35 is attached to the side surface of the case 31. In addition, the transparent dial 41 is provided with an indicator 49 having a time character at a predetermined position. A transflective plate 47 is disposed on the lower surface side of the transparent dial 41, and this transflective plate is further provided. The solar cell 39 is arranged under the 47. The indicator 49, the transmissive dial plate 41, and the transflective plate 47 constitute a solar cell timepiece dial 40 (hereinafter referred to as a timepiece dial).

  FIG. 3 shows a cross-sectional view of the main part of the timepiece dial according to the embodiment of the present invention. The timepiece dial 40 has a structure in which an index 49 such as a time letter is provided on the upper surface of the transparent dial 41 and a transflective plate 47 is provided on the lower surface side. The transparent dial 41 is provided with a prism 43 on the lower surface. The prism 43 in the present embodiment has a triangular shape having slopes (reflecting surfaces) 43a and 43b having two reflecting functions, and the ridge lines of the prism are arranged in parallel at equal intervals. It has a prism. The angle of the convex portion (ridge line angle) and the angle of the concave portion (valley) formed by the two inclined surfaces 43a and 43b of the stripe-shaped prism 43 are both in the range of 75 ° to 100 °. The height is 15 to 100 μm, and the pitch is about 50 to 150 μm. These heights and pitches are preferably formed to dimensions that are easy to mold and are not visible. The slopes 43a and 43b are glossy surfaces and serve as reflecting surfaces. The glossy surface is formed by transferring from a mirror-finished mold.

  This prism 43 is provided to disperse and scatter the reflected light of the solar cell. In the present embodiment, a stripe-shaped prism is used, but the present invention is not limited to a stripe-shaped prism, and a geometrically shaped prism such as a Piaget-cut prism can be applied.

  The transparent dial 41 is formed by an injection molding method using a transparent polycarbonate resin, an acrylic resin, or the like. The prism 43 is formed by transferring from a mold, but the glossy surfaces of the two inclined surfaces 43a and 43b are formed by transferring from a mirror-finished mold.

  The transflective plate 47 has both functions of light transmission and light reflection. The purpose is to transmit a required amount of light to cause the solar cell to generate power and to light the dial by reflecting light. Provided. In the present embodiment, the transflective plate 47 is composed of a reflective polarizing plate. As shown in FIG. 4, the reflective polarizing plate has a reflection axis N and an easy transmission axis M, and a linearly polarized light component having a vibration plane parallel to the reflection axis N is reflected and parallel to the easy transmission axis M. A linearly polarized light component having a simple vibration surface has a transmission characteristic. Further, it has a characteristic of transmitting about 50% of light and reflecting about 50% of light. Examples of the reflective polarizing plate include the product name DBEF manufactured by Sumitomo 3M. There are two types of DBEF, one having a glossy silver color (silver color) in reflected light and one having a gold color. When a silver color is used, a white metal color appears and appears. The selection of these two types of colors may be appropriately selected according to the design or the like. The transflective layer 47 is not limited to a reflective polarizing plate, and a transparent resin sheet or a resin plate provided with a metal thin film or a paint thin film provided with transparency may be used. Moreover, you may comprise with the metal plate etc. which provided the some small hole.

  Next, the operation of the timepiece dial 40 with a solar cell composed of the transmissive dial 41 provided with the prism 43 and the transflective plate 47 will be described with reference to FIG. As shown in FIG. 5, when the external light P <b> 1 enters the transparent dial 41, it is refracted and enters the inclined surfaces 43 a and 43 b of the prism 43. Part of the incident light is transmitted and refracted at the boundary surface between the inclined surfaces 43 a and 43 b, travels toward the semi-transmissive reflector 47, and enters the semi-transmissive reflector 47. On the other hand, although not shown, a part of the incident light is reflected by the boundary surface between the inclined surfaces 43a and 43b, and returns to the transmissive dial 41 again to be emitted outside. The light incident on the transparent dial 41 hits the boundary surface of the inclined surfaces 43a and 43b that moves from the resin layer to the air layer. However, the incident angle becomes a large angle because the inclined surface is a prism inclined surface, and the angle exceeds the critical angle. Since it is easy, the amount of light reflected increases. Next, the linearly polarized light component n1 having a vibration plane parallel to the reflection axis of the reflective polarizing plate used as the semi-transmissive reflective plate 47 is reflected from the reflective polarizing plate, and again the prism 43 of the transmissive dial 41. Are incident on the slopes 43a and 43b. At this time, the inclined surface is a boundary surface that moves from the air layer to the resin layer, and is incident obliquely on the inclined surface because of the prism, so that the transmittance is improved. The incident light is transmitted, refracted, and dispersed, passes through the transparent dial 41, and is radiated to the outside as reflected light P2. Next, the linearly polarized light component m1 having a vibration plane parallel to the transmission easy axis of the reflective polarizing plate passes through the reflective polarizing plate and enters the solar cell 39. The light incident on the solar cell 39 is divided into light absorbed therein and light reflected therefrom. The light absorbed by the solar cell 39 causes the solar cell 39 to generate power. The light reflected from the solar cell 39 is linearly polarized light component m2 having a vibration plane parallel to the transmission easy axis of the reflective polarizing plate, passes through the reflective polarizing plate, and enters the inclined surfaces 43a and 43b of the prism 43. The incident light is transmitted, refracted, and dispersed, passes through the transparent dial 41, and is radiated to the outside as reflected light P3. Of the light reflected from the solar cell 39, the linearly polarized light component n2 having a vibration plane parallel to the reflection axis of the reflective polarizing plate is reflected from the reflective polarizing plate and becomes P4 light, which is on the solar cell 39 side. Returning to Fig. 4, the solar cell 39 absorbs it and uses it for the power generation function.

  As described above, the light incident on the transmissive dial 41 increases the amount of light reflected by the prism 43 and the light reflected by the semi-transmissive reflector 47 and diffuses. Further, the amount of light that is reflected from the solar cell 39 that is not used in the solar cell 39 and returns to the transparent dial 41 is very small and diffuses. As a result, the light is dispersed and diffused. The ratio of the reflected light from the solar cell 39 with respect to the amount of light reflected from the transmissive dial 41 is reduced, the reflected light from the solar cell 39 is dispersed and diffused, and the reflected light from the transflective plate 47 is also Light that is transmitted through the transparent dial 41 and radiated to the outside by being dispersed and diffused or the like is radiated. For this reason, the dark purple color tone of the solar cell 39 is erased, and a white tone appears on the transparent dial 41 due to the dispersed / scattered light. Brightness appears on the transparent dial 41. In particular, when a reflective polarizing plate in which the reflected light has a silver color is used, the effect of whiteness appears remarkably.

In this embodiment, the transparent dial 41 is formed with a transparent resin. This is not particularly limited to the transparent resin, but may be formed from a colored resin having a required permeability.

  Further, an uneven pattern pattern layer or the like can be provided on the upper surface of the transparent dial 41. Decoration is enhanced when there is an uneven pattern layer. In addition, the unevenness of the light causes refraction and reflection of light, which further increases the dispersion and diffusion of light. Then, the elimination of the color of the solar cell is promoted, and the whiteness of the dial is promoted.

  In this embodiment, the transflective plate 47 is composed of a reflective polarizing plate. However, a sheet provided with a metal thin film, a metal plate provided with a plurality of transmissive openings, and the like can be used. If it has, it is good.

  Hereinafter, the dial for timepieces with solar cell of the present invention will be described in more detail with reference to examples. First, a dial for timepiece with solar cell according to Embodiment 1 of the present invention will be described with reference to FIG. 6A and 6B are a plan view and a main part sectional view of the timepiece dial with solar cell according to the first embodiment of the present invention. FIG. 6A is a plan view, and FIG. 6B is a main part sectional view. FIG. In the following description of the embodiment, the timepiece dial with solar cell will be referred to as a timepiece dial.

  From FIG. 6, the timepiece dial plate 50 according to Example 1 of the present invention is provided on the upper surface of the transparent dial plate 51, the transflective reflection plate 57 provided on the lower surface of the transparent dial plate 51, and the upper surface of the transparent dial plate 51. It is configured with an index 59 which is a time character. Here, a stripe-shaped prism 53 is provided on the lower surface of the transparent dial 51, and a pattern pattern layer 52 having a partially uneven surface is provided on the upper surface of the transparent dial 51. The transflective plate 57 is formed by providing a transparent white coating film 57b on a transparent resin sheet 57a. The timepiece dial 50 is used by being disposed on the upper surface side of the solar cell.

  The transparent dial 51 is formed by an injection molding method using a resin such as a transparent polycarbonate resin or an acrylic resin. The transparent dial 51 is formed by providing a prism 53 on the lower surface and a concave portion 51a on the upper surface side during injection molding. The prism 53 has a striped prism shape that is the same shape as the prism used in the above-described embodiment. That is, a plurality of prisms having a triangular shape having two glossy slopes are arranged in parallel at equal intervals to form a striped prism, and both the angle of the convex portion and the concave portion of the prism are 75. The prism 43 has an angle of 15 ° to 100 °, the height of the prism 43 is 15 to 100 μm, and the pitch is about 50 to 150 μm. In addition, the concave pattern 51 a provided in the transparent dial 51 is provided with a pattern pattern layer 52 having a grid pattern. The concave / convex pattern pattern layer 52 is formed from a shell, and the convex portion 52a and the concave portion 52b are formed by partially etching the shell. The pattern pattern layer 52 is provided by sticking the shell provided with the convex portion 52a and the concave portion 52b to the concave portion 51a of the transmissive dial 51 through an adhesive. As the shellfish, white butterfly shellfish, abalone shellfish and the like can be used. White butterfly shells, abalone shells, etc. have a transmittance of about 50% with a thickness of 0.1 mm, and therefore can be provided with unevenness that can be sufficiently visually recognized.

  The transflective plate 57 is formed by providing a transparent white coating film 57b on a transparent resin sheet 57a, and has both light transmission and light reflection functions. As the resin sheet 57a to be used, a sheet having a thickness of 0.15 to 0.3 mm made of a resin such as polycarbonate resin, polyimide resin, polyethylene resin, or polyethylene terephthalate resin, which has high heat resistance, moisture resistance, chemical resistance, and impact resistance is used. It is done. The white coating film 57b uses an ink formed by mixing 5 to 10% by weight of a white pigment with a resin such as a transparent urethane resin, epoxy resin, or acrylic resin, and is a printing method such as screen printing to a thickness of about 5 to 10 μm. Form. A light white tone appears and a transmittance of around 50% is obtained. The purpose of providing the white coating film 57b is to increase the whiteness and eliminate the yellowishness since the shellfish is yellowish. In this way, when the whiteness is increased, the yellowish hue of the shell disappears and the brilliancy appears vividly.

  In the timepiece dial plate 50 having the above configuration, the reflected light from the solar cell and the reflected light from the semi-transmissive reflective plate 57 are significantly dispersed and scattered by the prism 53 provided on the lower surface of the transmissive dial 51. The function of the white coating film 57b of the transflective plate 57 also acts and a strong white taste appears. And the pattern layer 52 of the lattice pattern of a shell appears in it clearly, and the yellowish color disappears in the pattern layer 52, and the radiance peculiar to a shell appears vividly. Thus, a timepiece dial having high decorativeness and high-class appearance can be obtained. The color of the solar cell disappears and is not visible.

  In addition, the portable watch using the timepiece dial 50 having the above-mentioned structure is bright and vivid with the unique shine of the shellfish. A display is obtained.

  In the first embodiment, the uneven pattern pattern layer 52 is partially provided, but may be provided over the entire surface of the transparent dial 51. Recent solar cell timepieces also have very good photoelectric conversion efficiency, and there are some watches that can generate sufficiently satisfactory power generation when the light transmittance is 15 to 20%. If the uneven pattern pattern layer is provided on the entire surface, the transmittance slightly decreases, but there is no problem if the required transmittance can be obtained. Incidentally, in the first embodiment, a transmittance of nearly 35% is obtained, and the influence on the power generation function of the solar cell has no problem.

  Even if the pattern layer 52 is formed of sapphire glass or ceramic instead of shells, the color tone and uneven shape of the pattern layer appear clearly. Further, the pattern pattern layer 52 may be formed of a metal plate provided with a plurality of openings. The opening is provided to transmit light, but when formed with a metal plate, the uneven shape can be easily formed, and various color tones can be obtained by surface treatment. In addition, a metallic feeling can be given to the dial.

  Moreover, in the present Example 1, the transflective board 57 was formed in the specification of the white color tone by providing the white coating film 57b on the transparent resin sheet 57a. This is selected according to the pattern pattern layer 52 formed of shells, and is not particularly limited to the white color tone. It is preferable to select a color tone that matches the specifications of the pattern layer. Further, the transflective plate 57 can also be constituted by a reflective polarizing plate or the like. And you may provide and use the coating film which has permeability | transmittance as needed.

  Next, a timepiece dial according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 7 shows a cross-sectional view of an essential part of a timepiece dial according to Embodiment 2 of the present invention.

  As shown in FIG. 7, the timepiece dial 60 according to the second embodiment of the present invention has a transparent dial 61, a transflective plate 67 provided on the lower surface side of the transparent dial 61, and an upper surface of the transparent dial 61. The transparent film 64 is provided and an index 69 which is a time character provided on the upper surface of the transparent film 64 is provided. The timepiece dial 60 is disposed on the upper surface side of the solar cell. Further, a Piaget-cut prism 63 is provided on the lower surface of the transparent dial 61 here, and a pattern pattern layer 62 having unevenness on the entire surface is provided on the upper surface. The transflective plate 67 is made of a metal plate provided with a plurality of small holes 67a.

  Here, the transparent dial 61 is formed by an injection molding method using a slightly colored resin such as polycarbonate resin or acrylic resin. The prism 63 provided on the lower surface is a Piaget-cut prism formed by aligning a plurality of prismatic prisms. The angle of the convex portion and the concave portion of the prism are both 75 ° to 100 °, the height of the prism 43 is 15 to 100 μm, and the pitch is about 50 to 150 μm. Since this Piaget-cut prism has four reflecting slopes, it causes significant light dispersion and light diffusion. The four slopes are glossy. The uneven pattern pattern layer 62 provided on the upper surface of the transparent dial 61 has a circular pattern in which the unevenness is arranged at regular intervals, and the uneven surface is finished to be a glossy surface. The glossy slope of the prism 63 and the glossy uneven surface of the pattern layer 62 are formed by transfer from a mold having a mirror finish.

  The transparent film 64 provided on the upper surface of the uneven pattern layer 62 has an upper surface 64a that is finished with a glossy smooth surface. A transparent epoxy resin, urethane resin, acrylic resin, or other resin is used for printing, and the surface is lapped to give it a glossy surface. As the resin used for the transparent film 64, it is preferable to select a resin having a refractive index different from that of the resin used for the transparent dial 61. For example, when a polycarbonate resin having a refractive index of 1.58 is used for the transparent dial 61, an acrylic resin having a refractive index of 1.49 can be selected for the transparent film 64. Acrylic resin has excellent properties such as light resistance, heat resistance, moisture resistance, impact resistance, and the like, and therefore can be suitably selected as a resin used for the coating film on the surface. In this way, by coating with a resin having a different refractive index, reflection / refraction occurs at the uneven surface between the transparent dial 61 and the pattern pattern layer 62. Since the light dispersed and diffused in the transparent dial 61 is further dispersed and diffused at the boundary surface with the pattern pattern layer 62, the light dispersion and diffusion appears remarkably.

  The uneven pattern layer 62 not only enhances decorativeness but also contributes to light dispersion / diffusion, so it helps to eliminate the color tone of the solar cell, and further contributes to an increase in brightness as well as an increase in whiteness.

  The transflective plate 67 is made of a metal plate provided with a plurality of small holes 67a. The small holes 67a are provided for supplying light to the solar cell, and are provided with a size of about 150 μm or less at regular intervals. If the size of the small hole 67a is 150 μm or less, the small hole 67a is hardly visible from the upper surface side of the dial. The number of small holes 67a is set in consideration of the required transmittance. The small holes 67a can be formed by a pressing method, a laser processing method, or the like.

  The transflective plate 67 is formed of an aluminum plate in the second embodiment, but the material is not particularly limited to the aluminum plate, and other materials such as a stainless plate and a brass plate may be used. Used with surface treatment such as plating or painting. Further, the surface may be used with an uneven pattern or the like. In the second embodiment, an Asahi pattern is applied, and when viewed from the upper surface side of the dial, the Asahi pattern is visually recognized with a metallic feeling.

  In the timepiece dial plate 60 having the above-described configuration, the color of the solar cell disappears due to the action of the prism 63 provided on the lower surface of the transparent dial 61 and the action of the uneven pattern pattern layer 62 provided on the upper surface. Since the sexual dial 61 is slightly colored, the uneven pattern pattern layer 62 becomes bright and clear and is clearly visible. Furthermore, the Asahi light pattern provided on the transflective plate 67 in the pattern pattern layer 62 is also visually recognized, so that a watch dial plate rich in decoration can be obtained.

  In the second embodiment, the transflective plate 67 is formed of a metal plate. However, instead of the metal plate, a sheet plate in which a metal film having a plurality of small holes is formed on a transparent resin sheet is used. Produces the same effect. The metal film is formed on the sheet by an electroforming method or the like. Moreover, if the metal film thickness is 20 to 30 μm, a fine uneven pattern can be sufficiently provided. In the present invention, a sheet-like member provided with a metal film is also applied as a transflective plate. In addition, the transflective plate 67 can be formed of a reflective polarizing plate.

  In the second embodiment, the Piaget-cut geometric pattern is selected as the prism shape. However, the geometric pattern of other shapes is not limited to the Piaget-cut shape. For example, there are many geometric patterns in which star shapes are arranged, geometric patterns in which snow crystal structures are arranged, and geometric patterns in the shape of flowers. Among these, it is preferable to select appropriately in consideration of the ease of mold manufacture and the dispersibility in the direction of light refraction.

  Next, a timepiece dial according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 8 shows a cross-sectional view of the main part of a timepiece dial according to Embodiment 3 of the present invention.

  As shown in FIG. 8, the timepiece dial 70 according to the third embodiment of the present invention is formed on the upper surface of the transparent dial 71 and the transflective plate 77 provided on the lower surface side of the transparent dial 71 and the upper surface of the transparent dial 71. A transparent film 74 in which the provided pearl fine powder 74a is dispersed, and an index 79 which is a time character provided on the upper surface of the transparent film 74. The timepiece dial 70 is disposed on the upper surface side of the solar cell. Here, a Piaget-cut prism 73 is provided on the lower surface of the transparent dial 71, and a transparent film 74 in which pearl fine powder 74a is dispersed is provided on the upper surface. The transflective plate 77 is formed by providing a metal thin film 77b on a transparent resin sheet 77a.

  Here, the transparent dial 71 is formed by an injection molding method using a resin such as a transparent polycarbonate resin or an acrylic resin. The prism 73 provided on the lower surface is a Piaget-cut prism formed by aligning a plurality of square pyramid prisms as in the second embodiment.

  On the upper surface of the transparent dial 71, a transparent film 74 in which pearl fine powder 74a is dispersed is provided. This is formed by a printing method or the like using an ink in which 2 to 5% by weight of pearl powder is mixed with a transparent resin such as urethane resin or epoxy resin. When mixed with pearl powder, a glittering radiance appears and gives a high-class feel. When the amount of the pearl powder to be mixed is small, a glittering feeling appears sparsely and is not preferable in appearance. When the amount is large, the transmittance is lowered and affects the power generation of the solar cell. 2 to 5% by weight is a suitable range.

The transflective plate 77 is formed by providing a transparent metal thin film 77b on a transparent resin sheet 77a, and has both functions of light transmission and light reflection. As the resin sheet 77a to be used, a sheet having a thickness of 0.15 to 0.3 mm made of a resin such as polycarbonate resin, polyimide resin, polyethylene resin, polyethylene terephthalate resin having high heat resistance, moisture resistance, chemical resistance, and impact resistance is used. It is done. Although the material of the metal thin film 77b is not particularly limited, in the third embodiment, a metal thin film using gold metal is provided. A gold metal film having a thickness of about 180 mm is formed by a vacuum deposition method, a sputtering method, an ion plating method, or the like. With a gold metal film having a thickness of 180 mm, a transmittance of about 50% is obtained, and a clear golden color tone is also obtained. In the case of forming by vacuum vapor deposition, the pressure at the time of vapor deposition in the chamber is 1 × 10 ^{−6 to} 5 × 10 ⁻⁵ torr (1.33 × 10 ^{−4 to} 6.65 × 10 ⁻³ Pa), The film thickness is freely controlled by the deposition time. Since the transmittance varies depending on the metal to be used, the film thickness is appropriately controlled in the required transmittance. Moreover, it is preferable that the metal to be used is appropriately selected according to specifications such as design.

  By configuring the timepiece dial plate 70 as described above, the gold color tone of the transflective plate 77 is changed to the matte color tone by the light dispersion / diffusion action of the prism 73. Then, a glittering shine of pearl powder appears in the matte gold color, and a luxury feeling rich in decoration appears on the dial.

  In Example 3, pearl was used as the glittering material, but the same effect can be obtained by using other powders such as shells, mica, titanium metal, and silicon oxide. In Example 3, the pearl powder is dispersed in the transparent resin, but the glittering material may be dispersed in the colored resin. It is preferable to select the color of the resin according to the specifications.

  Next, a timepiece dial according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 9 shows a cross-sectional view of a main part of a timepiece dial according to Embodiment 4 of the present invention.

  9, a timepiece dial 80 according to Example 4 of the present invention includes a transparent dial 81, a first transparent decorative film 84 provided on the upper surface of the transparent dial 81, and a transparent dial 81. A semi-transparent reflecting plate 87 provided on the lower surface side, a second transmissive decorative film 88 provided on the upper surface of the semi-transmissive reflective plate 87, and an index 89 comprising time characters provided on the first transmissive decorative film 84. And consists of The timepiece dial 80 is disposed on the upper surface side of the solar cell. Further, a Piaget-cut prism 83 is provided on the lower surface of the transparent dial 81 here. The transflective plate 87 has the same specifications as the transflective plate used in Example 3 described above, and comprises a transparent thin metal sheet 87b on a transparent resin sheet 87a. ing.

  Here, the transparent dial 81 is formed by an injection molding method using a resin such as a transparent polycarbonate resin or an acrylic resin. The prism 83 provided on the lower surface is a prism having the same specifications as the prism used in the second embodiment, and is a Piaget-cut prism formed by aligning a plurality of square pyramid prisms. The convex part angle and the concave part angle of the prism 83 are both 75 ° to 100 °, the height of the prism 83 is 15 to 100 μm, and the pitch is about 50 to 150 μm. The size of the prism 83 is not visible from the top surface. Since this Piaget-cut prism has four reflecting slopes, it causes significant light dispersion and light diffusion. The four slopes are glossy.

In the fourth embodiment, the first transparent decorative film 84 provided on the upper surface of the transparent dial 81 is formed by transferring a color image into a transparent resin film by a transfer method using a sublimation dye. It is a decorative film. A receiving layer is formed with a transparent polyurethane resin on the upper surface of the transparent dial 81, and the surface of the receiving layer is made smooth. Then, a transfer paper on which a color image is printed with a sublimation dye is formed on the receiving layer. Placed, heating temperature of about 180 degrees, 10-20 g / cm ²
The color image can be transferred into the receiving layer by applying pressure for 60 to 90 seconds with the above pressure. Further, an ultraviolet absorber is dispersed in the first transparent decorative film 84 in order to improve the light resistance of the color image.

  The transflective plate 87 has the same specifications as the transflective plate used in Example 3 described above, and is formed by providing a transparent metal thin film 87b on a transparent resin sheet 87a. . In the fourth embodiment, a metal vapor-deposited film of aluminum metal is provided as the metal thin film 87b.

  In the fourth embodiment, the second transmissive decorative film 88 provided on the transflective plate 87 is formed with a transmissive white coating film. In order to make the color image of the first transmissive decorative film 84 formed of a sublimable dye brighter and clearer, a second transmissive decorative film 88 made of a white coating film is provided on the transflective plate 87. It is.

  In the timepiece dial plate 80 having the above-described configuration, white taste appears darkly due to the action of the second transmissive decorative film 88 made of a white coating film provided on the semi-transmissive reflecting plate 87 and the action of the prism 83. . And since the whiteness is deep, the color image formed with the sublimable dye is brightly and clearly visible. Then, a bright, bright and beautiful color image rich in decorativeness can be obtained on the timepiece dial.

  In Example 4, a color image using a sublimation dye was provided as the first transmissive decorative film 84, but a beautiful image can be obtained even when a color image is formed using colored ink. . In the fourth embodiment, the second transparent decorative film 88 made of a white coating film is provided on the semi-transmissive reflector 87 in which the aluminum thin film 87b is formed on the resin sheet 87a. It is also possible to directly use the color tone of the metal thin film 87b. In this case, the white taste changes slightly.

  The first permeable decorative film and the second permeable decorative film work very effectively when color decoration is applied to the dial. Various color colors can be obtained by combining the coloring color of the first permeable decorative film and the colored color of the second permeable decorative film. For example, a golden color can be obtained by combining a red color and a yellow color. And design variations can be increased abundantly.

30 Cellular watch 39 Solar cell 40, 50, 60, 70, 80 Solar cell watch dial 41, 51, 61, 71, 81 Transparent dial 43, 53, 63, 73, 83 Prism 43a, 43b Slope 47, 57 , 67, 77, 87 Transflective plates 49, 59, 69, 79, 89 Index 52, 62 Pattern pattern layer 52a Convex part 52b Concave part 57a, 77a, 87a Resin sheet 57b White coating film 77b, 87b Metal thin films 64, 74 Transparent film 64a Upper surface 67a Small hole 74a Fine powder 84 First permeable decorative film 88 Second permeable decorative film

Claims (2)

In the timepiece dial with a solar cell having a solar cell on the lower surface side, the timepiece dial has a transmissive dial plate provided with a prism reflecting surface on the lower surface, and a transflective reflector provided on the lower surface side of the transmissive dial plate, have a, semi-transmissive reflective plate a plurality of transparent solar cells with the timepiece dial characterized in that the opening is constituted by a metal plate provided with. Timepiece dial with solar cell according to claim 1, wherein the kite is provided a pattern pattern layer of irregularities on the upper surface of the transparent dial.

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