JP4982151B2 - Display board - Google Patents

Description

  The present invention relates to a display panel, and more particularly to a display panel that is used with a solar cell, electroluminescence, or the like. The present invention also relates to a timepiece using the display board.

  Conventionally, plastic materials have been used for display panels of watches incorporating solar cells because they require light transmission. Plastics can be decorated in various ways and have the merit that the cost can be reduced. However, a plastic display board does not show a metallic feeling, and it has been very difficult to obtain a watch that gives a precious metallic feeling.

  Therefore, various devices have been conventionally made to obtain a metallic feeling. The technique described in Patent Document 1 below is one of them.

Japanese Patent Laid-Open No. 10-78486

  FIG. 10 shows a ¼ cut plan view of the display plate described in Patent Document 1. In FIG. 10, the display panel 1 is made of a material that gives a metallic feeling. Examples of the material that gives a metallic feeling include a metal plate or a resin plate obtained by metal plating. And it has the shape which provided the exit port 2 which has many thin diameters radially centering on the through-hole 1a for needle | hook attachment.

  According to Patent Document 1, since the exit port 2 has a small diameter and is smaller than the entire area of the display plate 1, the metal feeling of the display plate 1 is not impaired.

  As long as the display plate 1 described in Patent Document 1 is used as a display plate for electroluminescence (hereinafter referred to as EL), the EL can be seen from the emission port 2 because the EL has a white tone. But I don't care much about the appearance. However, when used as a display panel for a solar cell, the solar cell has a unique dark purple color, so that the exit port 2 is conspicuous and a deep purple color tone can be seen from the exit port 2. Does not give good feelings. Moreover, since it is necessary to make the light quantity required for power generation enter, there is a limit in reducing the area of the exit port 2.

  In addition, it is possible to make dark purple not visible by reducing the small-diameter exit port 2 to an invisible extent, but in order to do so, the exit port 2 must be enlarged. Needs to be 50 μm or less, and the manufacturing cost becomes very high due to problems of processing accuracy.

  The present invention has been made in view of the above problems, and an object of the present invention is to obtain a display panel in which the dark purple color of a solar cell is not visually recognized and has a metallic feeling and a high-class appearance. .

As a means to achieve the above object, the display panel according to claim 1 of the present invention includes a transparent substrate and a thin metal plate having at least one transmission hole having at least one reflective polarizer, the The transparent substrate, the metal thin plate, and the reflective polarizing plate are laminated in the order of the metal thin plate, the transparent substrate, and the reflective polarizing plate from the viewing side, and a space is formed between the transparent substrate and the reflective polarizing plate. And a concavo-convex pattern is provided on at least one surface of the reflective polarizing plate .

The display plate according to claim 2 of the present invention is characterized in that the metal thin plate has an uneven pattern.

The display plate according to claim 3 of the present invention is characterized in that the uneven pattern of the metal thin plate and the uneven pattern of the reflective polarizing plate form the same pattern.

  According to the present invention, the following invention effects can be obtained. The display panel of the present invention includes a transmissive substrate, a metal thin plate having at least one transmission hole, and at least one reflective polarizing plate. These are stacked to form a display panel.

  The metal sheet having at least one transmission hole makes a metal color appear, and the required amount of light is incident on the solar cell through the at least one transmission hole. At least one transmission hole is formed in a uniformly balanced state on the entire surface of the display panel in order to improve power generation efficiency. In particular, when it is formed into a pattern such as a circle pattern, a spiral pattern, a stripe pattern, a radial pattern, or a lattice pattern, a uniform amount of light can be supplied over the entire surface of the solar cell, and an external decorative property also appears. The size and total area of the transmission holes are set in consideration of the amount of light incident on the solar cell and the appearance of the decorative pattern. Moreover, if an uneven pattern is provided on the surface of the thin metal plate, the decorativeness is enhanced by the three-dimensional effect of the pattern. In addition, since the unevenness has an effect of diffusing the reflected light, the incident light is diffused and reflected by the thin metal plate, and the display plate is brightened. As the uneven pattern, a pattern such as a circle pattern, a spiral pattern, a stripe pattern, a radial pattern, a satin pattern, a sand pattern, a lattice pattern, a stone pattern, a geometric pattern, and the like can be cited as suitable patterns. Further, if the metal plate is decorated by plating, printing, painting, etc., the decorativeness can be further increased. For example, when finish plating of Ag, Pd, Pt or the like is performed, a white noble metal appearance appears. This thin metal plate is formed of a thin metal plate having a thickness of 0.07 to 0.15 mm. Since the through holes can be easily formed by etching, the manufacturing cost can be reduced.

  The transmissive substrate is provided in order to ensure the required strength of the display panel and give it rigidity, and at the same time to enhance the decorativeness of the display panel. When decoration is formed on a transparent substrate with a metal film, a paint film, an ink film, shells, stones such as precious stones, papers such as Japanese paper, holograms, etc., the decorativeness of the display board is enhanced. In particular, the decorativeness of the metal thin plate overlaps the decoration of the transparent substrate, so that a three-dimensional effect is created between the decoration of the thin metal plate and the decoration of the transparent substrate, and the depth of the metal thin plate decoration also appears. , You will feel a sense of luxury. And the variation of decoration can be increased. In addition, when a concavo-convex pattern is provided on the transmissive substrate, decorativeness is enhanced and light is refracted and dispersed by the concavo-convex structure, so that the solar cell is softened. Further, colored decoration can be obtained by coloring the transparent substrate.

  A reflective polarizing plate has a light reflection axis and an easy light transmission axis, and linearly polarized light having a vibration surface parallel to the light transmission axis is reflected and reflects linearly polarized light having a vibration surface parallel to the light reflection axis. The component light is transmitted. This reflective polarizing plate has a transmittance of about 50% and a reflectance of about 50%. This reflective polarizing plate is provided to control the amount of light transmitted through the display plate for reflected light from the solar cell and to increase the reflectance of incident light. Since it has a reflectivity of about 50%, the reflectivity of incident light from the outside also increases, producing an effect of brightening the display panel, and since it has a transmittance of about 50%, it exhibits a deep purple color from the solar cell. Reduces the transmittance of the reflected light and produces the effect of softening the deep purple. Even if an uneven pattern is provided on the reflective polarizing plate, the transmittance and reflectivity change little, and if a streak-like pattern or a satin-like pattern is provided, a light diffusing action occurs and the dark purple color of the solar cell is almost It becomes a state which is not visually recognized, and a white color tone comes to be visually recognized. When the metal thin plate is plated with Ag, Pd, Pt, etc. and finished in a white color tone, the color tone of the metal thin plate and the color tone of the reflective polarizing plate become the same color tone, and the white metal color tone appears as a whole A board will be obtained.

  Moreover, the display board of this invention consists of what laminated | stacked in order of the metal thin plate which has at least 1 permeation | transmission hole from the visual recognition side, a permeable board | substrate, and a reflective polarizing plate. The metal thin plate will be directly touched, and a metallic feeling will appear strongly, and decorativeness will be enhanced by surface treatments such as uneven patterns and plating, and a high-class feeling will appear. Further, when the transparent substrate is colored so as to have the same color tone as that of the metal thin plate, the entire display plate can be gathered with the color tone of the metal thin plate. Not only white-based silver colors but also gold-based colors can appear.

  When a display panel that exhibits the above effects is used in a watch for a solar cell, a metallic feeling appears, and the dark purple color of the solar cell is hardly seen, and a high-quality watch that is rich in decoration is obtained. It is done. In addition, a watch that does not hinder the power generation function can be obtained.

  Further, even when used in an electroluminescent watch, a metallic appearance appears and a high-quality watch with a rich decoration can be obtained.

  Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described with reference to FIGS. Here, FIG. 1 is a plan view and a principal part sectional view of a display panel according to the present embodiment, FIG. 1A is a plan view, and FIG. 1B is a principal part sectional view. FIG. 2 is a plan view of the thin metal plate in FIG. FIG. 3 is an explanatory view for explaining the operation of the reflective polarizing plate in FIG.

  In describing the display panel of the present invention, the present embodiment will be described by taking a display panel for a watch as an example, but this can be applied to display panels other than the display panel for a clock as well. As shown in FIG. 1A, the display board 10 of the present embodiment has a round outer shape and has a central hole 10a at the center. The center hole 10a is a mounting hole for a watch hand. Although not shown, the display board 10 is provided with an indicator such as a time letter on the surface of the transmissive substrate 11 and used as a display board for a watch. As shown in FIG. 1B, the display board 10 is provided on an upper part of the solar cell 9 indicated by a one-dot chain line, and is used as a display board for the solar cell.

  As shown in FIG. 1B, the display panel 10 has a configuration in which a transmissive substrate 11, a thin metal plate 14, and a reflective polarizing plate 17 are laminated from the upper viewing side. The transmissive substrate 11 and the metal thin plate 14 are pasted on the entire surface via an adhesive 13, and the metal thin plate 14 and the reflective polarizing plate 17 are pasted on the outer peripheral portion via an adhesive 16. A slight gap is provided between the thin metal plate 14 and the reflective polarizing plate 17 so that the light transmitted through the reflective polarizing plate 17 is diffused by the reflected light from the solar cell 9.

  The transmissive substrate 11 is provided for the purpose of ensuring the strength as a display board and for improving the decorativeness of the display board. The transparent substrate 11 is made of a material such as plastic, glass, or ceramic. Plastic materials are resin materials that are excellent in heat resistance, moisture resistance, light resistance, impact resistance, and chemical resistance. Polycarbonate resin, polyimide resin, polyethylene resin, polypropylene resin, polyacetal resin, polystyrene are used as such materials. Examples thereof include resins such as resins, polyethylene terephthalate resins, and acrylic resins. It is formed to a thickness in the range of 0.3 to 0.5 mm by a method such as an injection molding method.

  In this embodiment, the transmissive substrate 11 is not decorated with any decoration, but the upper surface is decorated with a metal film, a paint film, an ink film, shells, stones such as precious stones, papers such as Japanese paper, holograms, or the like. And can enhance the decoration. In addition, a three-dimensional effect or the like can appear in these decorations and the metal decoration of the metal thin plate 14.

  The thin metal plate 14 is provided for the purpose of causing the display panel 10 to display a metallic color tone. In order to make the solar cell 9 have a power generation function, a plurality of transmission holes 14b each having a narrow elongated hole are provided as shown in FIG. Provided. The transmission holes 14b shown in FIG. 2 are provided in a radial pattern, but this is only an example, and is arranged in a circle pattern, a spiral pattern, a stripe pattern, a lattice pattern, a geometric pattern, or a dot matrix. A pattern such as a small hole pattern can be cited as a suitable pattern. When the thin metal plate 14 is divided into four at 90 ° intervals, it is preferable to select a pattern in which the transmission holes 14b are uniformly distributed in each divided portion. If it does in this way, a uniform light quantity will be entered in the whole solar cell, and efficient electric power generation will be performed. The central hole 14 a of the thin metal plate 14 is a hole corresponding to the central hole 10 a of the display plate 10.

  The metal thin plate 14 is made of a thin plate having a thickness of 0.07 to 0.15 mm using a material such as a brass plate, a phosphor bronze plate, a white plate, a stainless plate, or an aluminum plate. The thickness is such that the transmission holes 14b can be easily formed by etching, and the thickness is such that various uneven patterns are provided on the upper surface 14c of the metal thin plate 14. The etching solution used for the etching process varies depending on the material of the thin metal plate 14, but, for example, a ferric chloride solution is used in the case of a brass plate, phosphor bronze plate, or white plate. The portions other than the through holes 14b are masked with a resin or the like and immersed in an etching solution for several minutes to form the through holes 14b.

  The total area of the transmission holes 14b is set in a range that does not affect the amount of light required by the solar cell. In the present embodiment, the total area of the transmission holes 14b is set in a range of 40% to 50% of the entire area. Further, the size of the transmission hole 14b (width of the elongated hole) is not particularly limited, and if it is 50 μm or less, a state where it is not visually recognized is obtained, and if it is more than that, the pattern of the transmission hole 14b is visible. Is obtained.

  An uneven pattern is provided on the upper surface 14c of the thin metal plate 14 in order to enhance the decoration. As the pattern, a circle pattern, a spiral pattern, a stripe pattern, a radial pattern, a satin pattern, a grain pattern, a stone pattern, a geometric pattern, etc. can be selected. When a streak is provided in a circle pattern, swirl pattern, stripe pattern, or radial pattern, or when a satin pattern is provided, glossiness is lost and a feeling of calmness appears. In the present embodiment, a satin pattern is provided on the upper surface 14c facing the viewing side by performing a satin treatment. The satin pattern can be formed by a sandblasting method in which sand is blown or a honing method in which glass beads are blown. Since the size of the unevenness is determined by the size of the particle size of sand or glass beads, an appropriate particle size is selected according to the surface appearance specifications.

  The thin metal plate 14 is subjected to a surface treatment such as plating in order to reveal a metallic feeling. As the white metal color, metal plating such as Ni, Cr, Pd, Rh, Pt, and Ag can be selected, and as the gold metal color, metal plating such as Cu and Au can be selected. In this way, when a noble metal color tone such as silver or gold is revealed, a high-class feeling appears. In the present embodiment, the base plating of Ni plating is performed, and the finish plating such as Pd plating is performed thereon, so that a noble metal feeling that feels softness that is white is displayed. The thin metal plate 14 may not only exhibit a metallic feeling, but may also be decorated by printing, painting, or the like in order to enhance the decorativeness.

  Next, as shown in FIG. 3, the reflective polarizing plate 17 is a polarizing plate having a reflection axis N and an easy transmission axis M orthogonal to the reflection axis N and having a vibration plane parallel to the reflection axis N. The component is reflected, and the linearly polarized light component having the vibration plane parallel to the easy transmission axis M has a characteristic of transmitting. It transmits about 50% light and reflects about 50% light. In the present embodiment, a product name DBEF-E manufactured by Sumitomo 3M Co., Ltd., having a thickness of 160 μm is used. Various reflective polarizing plates 17 having a thickness of about 160 to 400 μm are commercially available, and can be selected as necessary. This reflection type polarizing plate 17 is provided in order to reduce the transmittance of the reflected light exhibiting deep purple from the solar cell 9 to the display panel 10. The amount of reflected light from the solar cell 9 emitted from the display panel 10 is reduced, and the effect of reducing the dark purple color of the solar cell 9 is produced. The product name DBEF manufactured by Sumitomo 3M Co., Ltd. used in this embodiment includes a silver color tone for reflected light and a gold color tone.

  Furthermore, an uneven pattern is provided on the upper surface 17c of the reflective polarizing plate 17 (the surface facing the thin metal plate 14). This uneven pattern is provided for diffusing the light transmitted through the reflective polarizing plate 17 by the reflected light from the solar cell 9 to erase the dark purple color of the solar cell 9. If an uneven pattern is provided, light diffuses and exits, so that a white color tone appears on the reflective polarizing plate 17. If a reflective polarizing plate 17 that can obtain silver reflected light is used, a white color tone with a white metal color can be obtained, and if a gold reflected light can be used, a white color tone mixed with a thin gold metal color can be obtained. can get. In the present embodiment, a reflective polarizing plate is used that can obtain silver reflected light in accordance with the plating color tone of the thin metal plate 14.

  Further, a slight gap is provided between the reflective polarizing plate 17 and the metal thin plate 14. Light is dispersed and diffused by the concavo-convex pattern of the reflective polarizing plate 17 due to the presence of a space layer as a gap. When the uneven pattern of the reflective polarizing plate 17 and the uneven pattern of the metal thin plate 14 are finished in the same pattern, and the metal thin plate 14 is finished in a color of white metal, an integrated pattern can be obtained under an integral color. Become. The uneven pattern provided on the reflective polarizing plate 17 is the same as the pattern provided on the metal thin plate 14, such as a circle pattern, a spiral pattern, a stripe pattern, a radial pattern, a satin pattern, a grain pattern, a stone pattern, a geometric pattern. Patterns can be selected. Note that the uneven pattern of the reflective polarizing plate 17 is not limited to the same pattern as the uneven pattern of the metal thin plate 14, and there is no problem even if it is a different pattern. Further, depending on the case, if the concave / convex pattern is not provided, the transmission hole 14b is hardly noticeable, and if the deep purple color is hardly noticeable, the concave / convex pattern need not be provided. In this embodiment, the same satin pattern as the metal thin plate 14 is provided. In addition, since the formation method of an uneven | corrugated pattern can take various methods, such as a hot press method, a cutting method, a sand blasting method, a weighting method using a weighting apparatus and a wire brush, it is preferable to select an appropriate method according to a pattern. .

  The satin pattern can adjust the whiteness depending on the size of the unevenness. For example, if the roughness of the unevenness is # 180 or more indicating the roughness of the sand paper, a color feeling in which the metallic color feeling and the white feeling are mixed in half is obtained. The metal color appears sparse and a beautiful white feeling is obtained. Further, the effect of whiteness becomes remarkable as the size of the unevenness is reduced. However, if it exceeds # 2000, the pattern is not transferred, and it is visually recognized that the metallic color feeling is cloudy rather than the white feeling. In # 120, the metallic color appears more strongly than the white. Therefore, in order to obtain a white feeling, it is preferable to set the size of the unevenness in a roughness range from # 180 to # 2000.

  The same phenomenon appears not only in the satin pattern, but also in a circle pattern, swirl pattern, radial pattern, stripe pattern, etc. It is affected by the depth of the irregularities that form the lines. As described above, when a reflective polarizing plate capable of obtaining silver reflected light is used, a color sense in which a white metallic color feeling and a white feeling are mixed is obtained, and a reflective polarizing plate capable of obtaining gold reflected light is used. A thin gold metal color sense and a white color sense can be obtained.

  Thus, when the reflective polarizing plate 17 is provided with an uneven pattern, the transmittance of the reflected light from the solar cell 9 is halved to 50% and the transmitted light is diffused even though it is a thin polarizing plate. So it produces the effect of erasing the dark purple of the solar cell. Further, even if various uneven patterns are formed on the reflective polarizing plate 17, the transmittance and the reflectance are hardly changed.

  In the present embodiment, the display panel 10 having the above-described configuration is configured such that the aperture ratio of the transmission holes 14b of the metal thin plate 14 (total area of the transmission holes 14b with respect to the entire area) is 40 to 50%, and the transmittance of the reflective polarizing plate 17. About 50% provides a light transmittance of 20-25%. In recent years, solar cells have improved power generation efficiency, and a cell with a size of 10 mm square and a transmittance of 15% can be obtained. Therefore, it is possible to obtain a transmittance that sufficiently satisfies the power generation function of the solar cell 9.

  In addition, the reflected light having a deep purple color from the solar cell 9 is reduced to half the light amount by the reflective polarizing plate 17, and further, the light amount transmitted through the transmission hole 14b of the metal thin film 14 is 20 to 25%. Reduce to light intensity. Further, the reflected light having a deep purple color is diffused by the textured irregularities of the reflective polarizing plate 17 and passes through the metal thin plate 14 as diffused light. Further, the direct reflected light from the metal thin plate 14 and the direct reflected light from the reflective polarizing plate 17 are emitted from the display plate 10 as diffuse reflected light due to the textured unevenness. As a result, the reflected light from the solar cell is diffused at the same time as the amount of transmitted light is reduced, and is mixed with the diffuse reflected light from the metal thin plate 14 and the reflective polarizing plate 17 and emitted from the display plate 10. The cell's dark purple color is erased and is hardly visible.

  Furthermore, since the amount of diffusely reflected light from the thin metal plate 14 and the reflective polarizing plate 17 is large, the display plate 10 becomes bright, and the metal color tone and pattern of the thin metal plate 14 are clearly visible.

  Further, when the transmission hole 14b of the metal thin plate 14 is of a size that cannot be visually recognized, the transmission hole 14b cannot be seen, and the display panel 10 as a whole has a dull white metallic color feeling and a feeling of calmness. Furthermore, if the transmission hole 14b is of a visible size, the pattern of the transmission hole 14b also appears and the decorativeness is enhanced.

  Then, the noble metal feeling of the Pd-plated metal of the thin metal plate 14 looks bright and well, and is visually recognized as a high-quality display board.

Example 1 is shown as Comparative Example 1. (Hereinafter, Example 1 is Comparative Example 1.)
Hereinafter, more detailed contents of the present invention will be described in the following examples. Although all the embodiments will be described using a display panel for a watch, this can be applied in common to display boards such as display boards and nameplates of other devices regardless of the clock. First, the display panel according to Example 1 will be described with reference to FIGS. Here, FIG. 4 shows a cross-sectional view of a main part of a timepiece using the display panel according to the first embodiment of the present invention. 5A and 5B are a plan view and a main part sectional view of the display panel in FIG. 4, wherein FIG. 5A is a plan view and FIG. 5B is a main part sectional view. FIG. 6 shows a ¼ cut plan view of the metal thin plate in FIG.

  In the timepiece 20 shown in FIG. 4, the display plate 30 and the movement 28 are fixed to the hollow portion of the case 21 through the middle frame 27, and the back cover 26 is fixed to the case 21 to completely fix the middle frame 27. It has a configuration. A solar cell 29 is fixed to the movement 28, and a pointer 24 such as a long hand or a short hand is attached to the pointer shaft protruding from the movement 28 from the viewing side of the display plate 30. The windshield 22 is fixed to the case 21 and the windshield 22 covers the pointer 24 and the display board 30. Although not shown, a band is attached to the case 21. An indicator 39 such as a time letter is attached to the display board 30 and used as a clock display board.

  As shown in FIG. 5, the display board 30 of Example 1 has a configuration in which a transparent substrate 31, a metal thin plate 34, and a reflective polarizing plate 37 are attached and laminated from the viewing side via an adhesive. The transmissive substrate 31 and the metal thin plate 34 are attached via an adhesive 33, and the metal thin plate 34 and the reflective polarizing plate 37 are attached to the outer peripheral region thereof via an adhesive 36. The transparent substrate 31 is provided with a decorative member 32 made of a shell in a recess 31a in the central region.

  In Example 1, the transmissive substrate 31 is formed by an injection molding method using a transparent polycarbonate resin. A concave portion 31a is formed in a required size in the central region, and a decorative member 32, which is a shellfish, is attached to the concave portion 31a. Abalone shellfish and white butterfly shell are used as shellfish. A shining shell pattern peculiar to shellfish appears and a high-quality decoration is obtained.

  The metal thin plate 34 is formed of a phosphor bronze plate having a thickness of 0.1 mm, and a plurality of transmission holes 34b that are radially long holes are provided as shown in FIG. The shape of the transmission hole 34b is substantially the same as that of the above-described embodiment, but the aperture ratio of the transmission hole 34b (total area of the transmission hole 34b with respect to the entire area) is provided in the range of 40 to 50%, and the solar cell The aperture ratio allows sufficient incident light to be obtained. The width of the elongated hole of the transmission hole 34b is 150 to 200 μm. Further, the upper surface 34c is provided with a radial pattern composed of radial streaks, on which Ni base plating and Ag finish plating are applied. Accordingly, the thin metal plate 34 has a radial streak pattern and forms a thin metal plate in which a matte silver metal color appears. In addition, since the finish plating of Ag is easily discolored, it is preferable to form a coating film, a chromate film or the like on the surface thereof.

  The reflective polarizing plate 37 has the same specifications as the reflective polarizing plate used in the above-described embodiment, has a reflection axis and an easy transmission axis, and transmits about 50% of light, and about 50%. It has the property of reflecting light. On the upper surface 37c (the surface facing the thin metal plate 34) of the reflective polarizing plate 37, a radial pattern having the same pattern as the pattern provided on the thin metal plate 34 is provided. When the metal thin plate 34 and the reflective polarizing plate 37 overlap, it appears as an integral radial pattern. Further, when a reflective pattern is provided on the reflective polarizing plate 37, light diffusion occurs and a white color appears.

  When the reflective polarizing plate 37 provided with the radial pattern and the thin metal plate 34 provided with the radial pattern and plated with Ag are overlapped, the same pattern appears under the same color tone of white. Further, the size of the transmission hole 34b is visible, and the shape outline of the transmission hole 34b is emphasized by the reflected light of the reflective polarizing plate 37 so that the pattern of the shape of the transmission hole 34b is visually recognized. It will be.

  From the display panel 30 having the above-described configuration, a noble decoration can be obtained by overlapping a silver metallic color with a radial pattern and a shell pattern having a glitter color unique to the shell. In addition, a three-dimensional appearance appears because the transparent layer of the transmissive substrate 31 is formed on the shell metal pattern and the silver metal having a radial pattern. At the same time, a depth appears in the matt silver metal with the radial pattern of the thin metal plate 34. In addition, the pattern of the outline shape of the transmission hole 34b of the thin metal plate 34 can be seen, and a display plate having a high decorative property can be obtained. Further, due to the unevenness of the radial pattern of the metal thin plate 34 and the unevenness of the radial pattern of the reflective polarizing plate 37, significant diffuse reflected light appears and the display board becomes bright. And a pattern and a color come to be visually recognized clearly. And in a timepiece using such a display board, it becomes a timepiece rich in metal feeling and decorativeness, and a high-class feeling appears.

  Also, the reflected light having a deep purple color from the solar cell is diffused, and the dark purple color is erased and is not visually recognized.

  In addition, in Example 1, although the decoration member 32 which is a shellfish was affixed and decorated, it is not restricted to a shellfish and you may use another decoration member. Examples thereof include precious stones such as sapphire, opal, jade, and ruby, and stones such as marble, decorative members such as Japanese paper, silver foil, gold foil, and hologram. It is also possible to decorate with a plated metal film by dry plating, an ink film by printing, or a paint film by painting. Appropriate decoration may be applied according to the specifications to enhance the decorativeness.

  The timepiece of Example 1 is a timepiece with a solar cell. However, when EL (electroluminescence) is used instead of the solar cell, the timepiece has an EL. When EL is emitted in a dark place, the display board is illuminated brightly. When the display plate of Example 1 is used as an EL display plate, the light emitted from the EL is transmitted through the transmission hole 34b of the thin metal plate 34, and the metal color tone and pattern of the thin metal plate 34 are transmitted to the transparent substrate 31. The provided decorative member 32 is illuminated. Since EL light emitted from the transmission hole 34b of the thin metal plate 34 emits diffused light, the entire surface of the display plate 30 is illuminated, and a watch with a bright display can be obtained. Further, when the EL is not lit in a bright place, the EL has a color tone of yellowish green to white, so that it is close to the white color tone of the reflective polarizing plate 37 and the reflected light from the EL. Diffuses, so the EL color tone is hardly visible.

Example 2 is shown as Comparative Example 2. (Hereinafter, Example 2 is Comparative Example 2.)
Next, the display board of Example 2 is demonstrated using FIG. 7, FIG. FIG. 7 is a cross-sectional view of an essential part of the display plate according to the second embodiment of the present invention, and FIG. 8 is a plan view of a quarter of the thin metal plate in FIG.

  As shown in FIG. 7, the display board 40 of Example 2 is formed by laminating a transparent substrate 41, a metal thin plate 44, and a reflective polarizing plate 47 in this order from the viewing side (upper side in FIG. 7) through an adhesive. Make the pasted configuration. The transparent substrate 41 and the metal thin plate 44 are pasted with an adhesive 43, and the metal thin plate 44 and the reflective polarizing plate 47 are pasted with an adhesive 46 on the outer peripheral region. Although not shown, the display board 40 is used as a display board for a watch by providing indicators such as time letters on the upper surface side of the transmissive substrate 41.

  The transparent substrate 41 is made of a transparent polycarbonate resin, and the upper surface (viewing side) is provided with a lattice-shaped uneven pattern 41b. The pitch of the grid-like concavo-convex pattern is 100 to 150 μm and the height of the concavo-convex is 40 to 60 μm, so that the grid pattern can be clearly recognized.

  The metal thin plate 44 is formed of a phosphor bronze plate having a thickness of about 100 μm, and as shown in FIG. 8, transmission holes 44b made of elongated holes are provided in a circle shape. The width of the elongated hole of the transmission hole 44b is 150 to 200 μm, and the aperture ratio of the transmission hole 44b (the total area of the transmission hole 44b with respect to the entire area) is formed in the range of 40 to 50%. The transmission hole 44b is formed by etching with a ferric chloride solution.

  In addition, a striped pattern with stripes is provided on the upper surface 44 c of the thin metal plate 44. A stripe pattern is formed using a weighting device and a wire brush. Further, the metal thin plate 44 is subjected to a surface treatment, and a Pd finish plating is performed on the Ni base plating to reveal a white metal color.

  The reflective polarizing plate 47 has the same specifications as the reflective polarizing plate used in the above-described embodiment, and has characteristics of a transmittance of about 50% and a reflectance of about 50%. The upper surface 47c of the reflective polarizing plate 47 is provided with a striped streak pattern which is the same as the pattern of the thin metal plate 44, and the lower surface 47d is provided with a prism having irregularities in a circle pattern. Yes. This circle-shaped prism has a shape with a pitch of about 100 μm and an uneven height of 10 to 20 μm. This circle-shaped prism can be formed by a hot press method.

  In the display board 40 having the above-described configuration, the Pd metal color of the thin metal plate 44 is visually recognized as a stripe pattern while the lattice-shaped uneven pattern 41b of the transparent substrate 41 is visible, and the decoration is rich and noble metal-like. A metallic color tone appears. The reflected light from the solar cell is transmitted through the 50% reflective polarizing plate 47, but the transmitted light is dispersed in all directions by the circle-shaped prism on the lower surface 47d, and is further formed by the stripe pattern irregularities on the upper surface 47c. As it diffuses, significant diffusion occurs and the dark purple color of the solar cell is erased.

  Further, the directly reflected light reflected from the reflective polarizing plate 47 changes to reflected light that is dispersed and diffused by the unevenness of the stripe pattern on the upper surface 47c, so that it exhibits a white color tone, and the Pd plating color tone of the metal thin plate 44 A color tone that does not change much will be visually recognized. Further, the transmission hole 44b of the metal thin plate 44 has a visible size, and is visually recognized by the reflected light of the reflective polarizing plate 47 so that the pattern of the shape outline of the transmission hole 44b is emphasized.

  In the second embodiment, the concave / convex pattern 41b provided on the transparent substrate 41 is provided in a lattice pattern, but the present invention is not limited to the lattice pattern and may be provided in other patterns. For example, various patterns such as a stripe pattern, a circle pattern, a spiral pattern, a piage cut pattern, and a geometric pattern can be selected. It is also possible to provide a transparent protective film on the surface of the uneven pattern 41b. When providing a transparent protective film, it is preferable to select a resin having a refractive index different from the refractive index of the transmissive substrate 41. For example, when a polycarbonate resin (refractive index of 1.58) is used for the transmissive substrate 41, an acrylic resin (refractive index of 1.49) may be selected for the protective film. The uneven pattern 41b can be clearly recognized by the difference in refractive index.

  In Example 2, prisms were provided in a circle pattern on the lower surface 47d of the reflective polarizing plate 47 so that the reflected light of the solar cell was dispersed in all directions. Since this may be an uneven pattern that disperses the reflected light of the solar cell, a spiral pattern, a piage cut pattern prism, or the like can be cited as a suitable pattern in addition to the circle pattern. These patterns can be formed by a hot press method or a cutting method.

  Next, the display board of Example 3 is demonstrated using FIG. FIG. 9 is a cross-sectional view of a main part of the display panel according to the third embodiment. The display board 50 of Example 3 has a configuration in which a thin metal plate 54, a transmissive substrate 51, and a reflective polarizing plate 57 are laminated from the viewing side. The metal thin plate 54 and the transmissive substrate 51 are pasted via an adhesive 53, and the transmissive substrate 51 and the reflective polarizing plate 57 are configured such that their outer peripheral regions are pasted via an adhesive 56.

  The thin metal plate 54 of Example 3 is formed by using a phosphor bronze plate of 0.1 mm, and a radial pattern-shaped transmission hole that is an elongated hole having the same specifications as the transmission hole described with reference to FIG. 6 in Example 1 described above. And the width of the elongated hole is 40 to 70 μm. The upper surface 54c is provided with a concavo-convex pattern such as a satin pattern, and the surface treatment is Ni plating and Au plating to finish the surface with a gold metal color tone.

  The transparent substrate 51 is made of polycarbonate resin, but is colored light orange. This light orange color is a color selected close to gold, and a gold metal color appears from the entire display panel 50. This coloration is formed by mixing a pigment with a resin to form a pellet and then forming it by an injection molding method.

  The reflective polarizing plate 57 is a polarizing plate that has a transmittance of about 50% and a reflectance of about 50% and can obtain a gold-colored reflection color, as used in the first embodiment. A radial uneven pattern having the same pattern as that provided on the metal thin plate 54 is provided on the upper surface 57c. From the reflected light from the reflective polarizing plate 57, a white color tone with a slight gold metal color appearance appears.

  The display board 50 having the above-described configuration has a strong gold metal color tone and a high-grade appearance on the display board. On the other hand, the transmission holes provided in the thin metal plate 54 are sized to be slightly visible, but the transparent substrate 51 is colored in the same color system, and the reflective polarizing plate 57 has the same pattern. As a result, the transmission hole is almost indistinguishable at first glance, and it can be visually recognized as an integrated pattern and an integrated color tone.

  Further, the deep purple color from the solar cell is dispersed and diffused by the textured pattern of the reflective polarizing plate 57, and further mixed with the color tone of the transmissive substrate 51 to be erased and disappear.

  It is also possible to provide a transparent protective film on the surface of the thin metal plate 54 of the display plate 50 configured as described above. Damage to the metal thin plate 54 can be prevented by the transparent protective film.

  As mentioned above, although it demonstrated in detail with Examples 1-3, this Example has shown what used one reflection type polarizing plate. For example, two reflective polarizing plates can be used in an overlapping manner. In the case where two are overlapped, the transmittance decreases if both the easy transmission axes (or may be reflection axes) are shifted a little while being overlapped. On the other hand, the reflectance increases. When it is desired to further reduce the transmittance, it is also effective to use two overlapping ones. The reflective polarizing plate is described as being disposed on the lower surface of the transmissive substrate and the thin metal plate. However, the reflective polarizing plate is provided with an uneven pattern on the surface of the reflective polarizing plate, and the upper side of the transmissive substrate and the thin metal plate. The design variation can be expanded. Further, although the transmissive substrate, the metal thin plate, and the reflective polarizing plate are laminated and fixed with an adhesive or the like, it goes without saying that it can be achieved by simply laminating without using the adhesive or the like.

  Moreover, although Example 1-3 demonstrated using the display board for timepieces, this is applicable also to another display board irrespective of the display board for timepieces. For example, a display board such as an in-vehicle meter having a backlight, a panel display board having a backlight, and the like can be given. Further, the present invention can be applied to an electronic device driven by a solar cell.

FIG. 1A is a plan view and FIG. 1B is a cross-sectional view of a main part of a display panel according to the present embodiment. FIG. 2 is a ¼ cut plan view of the metal thin plate in FIG. 1. It is explanatory drawing explaining the effect | action of the reflective polarizing plate in FIG. It is principal part sectional drawing of the timepiece using the display board which concerns on Example 1 of this invention. 4A and 4B are a plan view and a main part sectional view of the display panel in FIG. 4, in which FIG. 5A is a plan view and FIG. 5B is a main part sectional view. FIG. 6 is a ¼ cut plan view of the thin metal plate in FIG. 5. It is principal part sectional drawing of the display board which concerns on Example 2 of this invention. It is a 1/4 cut top view of the metal thin plate in FIG. 6 is a cross-sectional view of a main part of a display panel according to Example 3. FIG. 6 is a ¼ cut plan view of a display plate described in Patent Document 1.

Explanation of symbols

9, 29 Solar cell 10, 30, 40, 50 Display board 10a Center hole 11, 31, 41, 51 Transparent substrate 31a Recess 13, 16, 33, 36, 43, 46, 53, 56 Adhesives 14, 34, 44, 54 Metal thin plates 14b, 34b, 44b Transmission holes 14c, 17c, 34c, 37c, 44c, 47c, 54c, 57c Upper surface 17, 37, 47, 57 Reflective polarizing plate 20 Clock 21 Case 22 Windshield 24 Pointer 26 Back cover 27 Middle frame 28 Movement 32 Decoration member 39 Index 41b Uneven pattern

Claims (3)

A transparent substrate, a thin metal plate having at least one transmission hole, and at least one reflective polarizing plate, wherein the transparent substrate, the thin metal plate, and the reflective polarizing plate are a thin metal plate, a transparent substrate, It is laminated in the order of the reflective polarizing plate, a space layer is provided between the transparent substrate and the reflective polarizing plate, and an uneven pattern is provided on at least one surface of the reflective polarizing plate. The display board characterized by having. The display plate according to claim 1, wherein the metal thin plate has an uneven pattern. 3. The display panel according to claim 1, wherein the uneven pattern of the metal thin plate and the uneven pattern of the reflective polarizing plate are the same pattern.

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