JP2006084242A - Dial for timepiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dial for timepieces capable of acquiring metallic luster and a satisfactory light transmittance without requiring a large number of expensive metal molds. <P>SOLUTION: A large number of protrusion parts 6 having circular, elliptical, and polygonal flat surface shapes are formed in at least one surface of a light transmitting dial plate 4 by a printing method to form the dial for timepieces. By forming the protrusion parts 6 by a printing method, especially by a pad printing method, it is possible to finely set the diameter of circles of the flat shape and the diameter and pitch of circumscribed circles of the ellipses and the polygons in the protrusion parts 6 and also possible to form the protrusion parts 6 by mixing particles which reflect light in ink. It is thereby possible to variously set the light transmittance of the dial plate 4 and its luster. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technique for improving the light transmittance of a timepiece dial and obtaining a metallic color appearance in a timepiece equipped with a solar cell.

  Since a timepiece dial in a wristwatch equipped with a solar cell is required to have light transmittance, a ceramic plate or a resin having light transmittance is often used as a material. A timepiece dial using a ceramic material has a high appearance and a high-quality white background, but there is a problem that a processing process into a thin plate is difficult and expensive. In addition, a dial made of transparent or translucent resin (plastic) on which letters and indicators are formed has good light transmission, low material costs, and easy substrate production. There was a problem that the appearance was lacking in luxury. Further, if the permeability is too good, a deep purple color peculiar to the solar cell is visually recognized from the dial, and there is a problem that it is not preferable in appearance. Examples of conventional techniques for solving such problems in the conventional timepiece dial are as follows.

  In the first prior art, a plurality of convex hemispherical surfaces and a plurality of light transmission holes for solar cells are formed on the lower surface of a plastic dial substrate by hot press molding, and a vapor deposition film such as silver is formed on the convex hemispherical surfaces. The light transmission hole is made inconspicuous by utilizing the recursive nature of the light of the concave hemispherical surface, and a glittering metallic appearance with a glittering appearance appears (see Patent Document 1). ). However, this method has a problem of requiring an expensive hot press mold and vapor deposition equipment.

  In the second prior art, a large number of fine hemispherical or polygonal concavities and convexities are formed on the lower surface of the dial, and when viewed from the upper surface of the dial, these fine irregularities are irregularly reflected to exhibit a glittering metallic appearance. At the same time, the aim was to make the dark purple color of the solar cell less visible (see Patent Document 2). However, this conventional technique mainly assumes injection molding of plastic material using a mold, and the mold becomes expensive, and a large number of molds are used for a timepiece dial belonging to a variety of small-quantity products in shape and size. There was a problem that a mold was necessary and it was not economical.

In the third prior art, a plurality of concavo-convex patterns in a lattice shape, stripe shape, and circle shape are formed on the lower surface of a transparent dial plate substrate by transfer from a mold, and silver metal or the like is deposited on the front surface of the rugged surface. After the film is formed, the lower surface of the dial is polished to remove the convex deposition film, and a transmittance adjusting film made of a white pigment or the like is formed thereon to have light transmittance and a metal color tone. The dial for timepieces was obtained (refer patent document 3). However, this prior art also has a problem that an expensive mold is required.
JP 2002-267770 A JP 2002-286867 A JP 2004-108949 A

In recent years, watches are required to be fashionable, especially for dials, and a wide range of design variations are required. There is a need to provide a more inexpensive watch dial. In addition, with the widespread use of timepieces that generate power using solar cells, there is a need for timepiece dials that satisfy both the desired appearance and light transmission quality. However, the above prior art cannot meet such a demand.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a timepiece dial that does not require a large number of expensive molds and that can provide a metallic sparkle and can provide a good light transmittance.

  The timepiece dial of the present invention is a timepiece dial disposed and used on a solar cell, in which a large number of convex portions having a planar shape of a circle, an oval, or a polygon are formed on at least one surface of the dial substrate. Is. The convex portions of the timepiece dial are formed by a printing method. The printing method is a pad printing method. Moreover, the diameter of the planar circle of the convex part, or the diameter of an oval or polygonal circumscribed circle is 20 to 80 μm. The pitch of the convex portions is 50 to 180 μm. Moreover, the formation ratio of the said convex part is 15 to 50% of the surface area of a dial substrate. The convex portion is made of transparent ink. Moreover, the convex part is added with particles made of a transparent material having a refractive index higher than that of the main ink material. The ink for forming the convex portion by a printing method includes an additive material made of a light reflective member such as metal powder, metal pieces, calcium carbonate particles, calcium oxide particles, titanium oxide particles, resin pieces, and glass pieces. Yes. Further, the timepiece dial is provided with a convex portion including the additive material made of the light reflecting member and a transparent film covering the gap between the convex portions. Moreover, the said convex part consists of colored dye ink. Moreover, the said convex part is formed by arrange | positioning the convex part which consists of colored dye ink, and the convex part which consists of transparent materials.

  In the present invention, since a plurality of convex portions are formed on the upper or lower surface of the translucent dial substrate, the convex portions reflect the light, and the dial has a glittery metallic appearance. As a result, it is possible to increase the appearance and improve the appearance by making it difficult to visually recognize the deep purple color of the solar cell from the upper surface of the dial while maintaining light transmittance.

  Further, in the present invention, since the plurality of convex portions are arranged in a dot shape at a predetermined interval, the timepiece dial in a timepiece mounted with a solar cell can be obtained by setting the size and interval of the convex portions appropriately. The light transmittance required for the control can be controlled relatively easily.

  In addition, by forming a large number of convex portions provided on the dial substrate formed by injection molding or the like by a printing method while changing the size, pitch, and type of pigment added to the ink, Various design variations can be obtained. This eliminates the need for a large number of expensive dies and can cope with the production of a small lot. In particular, in the case of pad printing, the positive film and the glass original plate are extremely inexpensive as compared with the mold, and the manufacturing cost can be greatly reduced.

  Further, by forming the convex portions by the pad printing method as described above, it is possible to form fine dot-shaped convex portions of 100 μm or less that are difficult to form by the screen printing method or the like. Thereby, fine and delicate gloss and control of transmitted light can be performed. In particular, by combining the convex portion with a diameter of 20 to 80 μm and a pitch of 50 to 180 μm under a predetermined condition, the convex formation ratio is set to a range of 15 to 50% of the surface area of the dial substrate. This makes it possible to freely control both the glitter and light transmittance of the dial.

  In addition, the use of a pigment ink in which 5 to 30% of metal powder, metal pieces, calcium carbonate particles, calcium oxide particles, titanium oxide particles, resin pieces, glass pieces, etc. are added in the ink forming the convex portions is further enhanced. A lustrous and sparkling appearance can be obtained.

  In addition, a timepiece dial having various color variations can be obtained by using a dye ink having a desired color tone.

  The timepiece dial of the present invention is a timepiece dial that is disposed on a solar cell and has a light-transmitting dial plate that has a circular, oval, or polygonal planar shape on at least one surface. Many parts are formed by a printing method. In this way, by forming the convex portion by the printing method, particularly the pad printing method, it is possible to finely set the diameter of the planar circle related to the convex portion, the diameter of the oval or polygon circumscribed circle, and the pitch. Further, the convex portion can be formed by mixing particles that reflect light into the ink. Thereby, it is possible to set various light transmittances and sparkles of the dial plate.

  1 is an enlarged partial sectional view showing a timepiece dial according to Embodiment 1, and FIG. 2 is an enlarged view of the vicinity of a convex portion shown in FIG. The timepiece dial 2 in this embodiment includes a translucent dial substrate 4 and a large number of convex portions 6 formed on the back surface thereof.

  The dial substrate 4 is made of a transparent polycarbonate material having a thickness of 0.5 mm, and is formed by a method of punching the plate material with a press or a method of molding using a molding die. If the dial plate substrate 4 is manufactured by the press method, both the mold and the plate material used for the manufacture are inexpensive, so that it can be manufactured at a low cost. However, the injection molding method has an Asahi pattern or the like on one side of the dial substrate 4. It is possible to form a plurality of convex portions 6 by printing according to the present invention on the opposite surface and to increase the number of design variation options. In this embodiment, a dial substrate 4 formed by injection molding is used.

  The convex portions 6 are substantially hemispherical and are formed in independent dot shapes by a printing method. The convex portion 6 in this embodiment is formed on the back surface of the dial substrate 4 by a pad printing method. In order to form the convex part 6 by this pad printing method, first, the printing original plate 8 shown in FIG. 3 is manufactured. This printing original plate 8 uses a material such as steel or glass as a printing original plate material, and after flattening the surface thereof, a concave portion 8a corresponding to the shape of the convex portion 6 is engraved on the surface by a chemical etching method or the like. It is formed by installing. Next, the printing ink 10 is placed in the concave portion 8a of the printing original plate 8, and the surface of the printing original plate 8 is scratched with a metal blade to remove excess ink. Thereafter, as shown in FIG. 4, the pad 12 made of a soft material and having a spherical surface is pressed against the surface of the printing original plate 8, and the printing ink 10 in the concave portion 8 a is adhered to the surface side of the pad 12, As shown in FIG. 5, the printing ink 10 is pulled away from the printing original plate 8. Next, as shown in FIG. 6, the pad 12 with the printing ink 10 attached is pressed against the back surface of the dial substrate 4 to transfer the printing ink 10 onto the back surface of the dial substrate 4, thereby forming the convex portion 6. Is forming.

  In principle, pad printing is not suitable for printing over a relatively large area such as screen printing or offset printing, but it is suitable for forming a fine design accurately in a small area such as a watch dial. Therefore, the fine convex part 6 can be formed. The pad printing can be freely selected from known inks such as acrylic, epoxy, urethane, and phenol. In this embodiment, a transparent phenolic ink is used. Further, when independent circles are printed on a flat surface, for example, in the form of dots having a diameter of 40 μm, by the pad printing method as described above, the print forming portion is a substantially hemispherical convex portion due to the surface tension or viscosity of the ink. Will be formed. For this reason, it is suitable for forming the convex part 6 in this invention. The planar shape of the convex portion 6 is not limited to a circle, but may be an ellipse, an ellipse, a rectangle, or other polygons. However, due to the effect of the surface tension of the ink, the shape of the upper surface of the convex portion is approximately. It becomes a shape close to a hemisphere.

  When the convex portion 6 is formed on the back surface of the dial substrate 4 having translucency by pad printing as described above, a part of the light irradiated from the front side of the dial substrate 4 is convex as shown in FIG. The light is reflected from the inner surface of the portion 6 and irradiated again through the dial substrate 4 in the surface direction. Further, a part of the light irradiated from the surface side of the dial substrate 4 is transmitted through the convex portion 6 or between them, and reaches the solar cell on the back side of the dial substrate 4.

  Although the convex portions 6 in the present embodiment are formed on the back surface of the dial substrate 4, a hemisphere of a large number of convex portions 6 regardless of whether the fine convex portions 6 are formed on either the front or back surface of the dial substrate 4. A similar effect is obtained in that the shaped surface forms a kind of lens and reflects light, whereby the dial substrate 4 appears to shine brightly. However, it is necessary to form numbers, letters, indicators, etc. on the surface of the timepiece dial 2 by a method such as printing or sticking, and the indicators can be formed more easily if the surface is flat. For this reason, in the present embodiment, the convex portion 6 is printed on the back side of the dial substrate 4.

  Further, when the plurality of convex portions 6 are formed on the dial plate substrate 4 by the printing method, for example, when the convex portions 6 having a circular planar shape are formed on the surface of the dial plate substrate 4, the diameter exceeds about 50 μm. The convex part 6 is visually recognized in a dot shape, which is not preferable. However, when the convex portion 6 is formed on the back surface of the dial substrate 4, as a result of the experiment, it was confirmed that the diameter was not visually recognized up to about 80 μm. In addition, the lower limit of the diameter of the convex portion 6 is 20 μm regardless of whether the dial plate 4 is formed on the front or back surface, and if it is smaller than this, the effect of glittering feeling is greatly retreated. From the above, it was confirmed that it is effective to set the diameter of the convex portion 6 in the planar shape to 20 μm to 80 μm. For this reason, in this embodiment, the planar shape of the convex portion 6 is set to a circle having a diameter of 40 μm. It has been confirmed that the height of the projection 6 at this time is about 20 μm.

  Further, the distribution of the convex portions 6 can be freely selected and set within a range where the mutual pitch is about 50 to 180 μm by using the pad printing method. It has been found from experimental results that it is preferable to set while adjusting the ratio of the formation area of the dot-like convex portions 6 to the total area of the plate. The experiment regarding the formation area ratio of the convex part 6 was performed by setting as follows.

(Experiment 1)
In Experiment 1, the planar shape of the convex portion 6 is fixed to a circle of 40 μm, and the mutual pitch of the convex portions 6 is 40 μm (78.6%), 50 μm (50%), 60 μm (35%), and 80 μm (20%). , 100 μm (12.5%) was set to change the formation area ratio of the convex portion 6 to the dial area to 78.6 to 12.5%, and the visual quality was confirmed. As a result, when the mutual pitch was 40 μm, it became close to a flat glossy feeling and the glittering feeling retreated. It was also found that when the mutual pitch was 100 μm, the glittering feeling was insufficient and the solar cell behind the dial was slightly visible. Therefore, in Experiment 1, it was confirmed that it is preferable to set the mutual pitch of the convex portions 6 to 50 to 80 μm so that the formation area ratio of the convex portions 6 is 50 to 20%.

(Experiment 2)
In Experiment 2, the planar shape of the convex portion 6 is a circle of 80 μm, and the mutual pitch of the convex portions 6 is 80 μm (78.5%), 100 μm (50%), 150 μm (22.3%), 180 μm (15.5). %) And 200 μm (12.5%), respectively, and the visual quality was confirmed in the same manner as in Experiment 1. As a result, when the mutual pitch was 80 μm, almost no glittering feeling was observed, and when 100 μm and 180 μm, the effect of glittering feeling was recognized, but each of the convex portions 6 was visually recognized in a circular shape, but at 200 μm It turned out that the feeling of glitter also receded. Therefore, in Experiment 2, it was confirmed that it is preferable to set the mutual pitch of the convex portions 6 to 100 to 180 μm so that the formation area ratio of the convex portions 6 is 50 to 15.5%.

(Experiment 3)
In Experiment 3, the planar shape of the convex portion 6 was a 20 μm circle, and the mutual pitch of the convex portions 6 was 100 μm (3%), 50 μm (12.6%), 40 μm (19.6%), and 30 μm (34.9). %) And 20 μm (78.5%), and the visual quality was confirmed. As a result, it was found that the best results were obtained when the mutual pitch was set to 40 μm and 30 μm, and the other advantageous effects could not be obtained. Therefore, in Experiment 3, it was confirmed that it is preferable to set the mutual pitch of the protrusions 6 to 30 to 40 μm so that the formation area ratio of the protrusions 6 is 34.9 to 19.6%. .

  Based on the results confirmed by the above experiments, in this embodiment, the diameter of the planar shape of the convex portion 6 is set in a range of 20 to 80 μm, and the mutual pitch of the convex portions 6 is set in a range of 50 to 180 μm. And the convex part 6 was formed in the dial board 4 which consists of transparent plastics by pad printing. Thereby, it was possible to give the dial substrate 4 a metallic tone and a satin texture. In addition, in the relationship between the planar shape diameter of the convex portion 6 and the mutual pitch, by setting the area of the convex portion with respect to the area of the dial substrate 4 to be 15 to 50%, an extremely good glitter feeling can be obtained. I was able to.

  Further, in this example, when the plurality of convex portions 6 are formed using epoxy-based ink having a refractive index of about 1.4 instead of phenol-based ink, the characters with further enhanced appearance glitter even under the same conditions. The board could be obtained. This is understood to be an effect obtained by increasing the difference between the polycarbonate (refractive index 1.58) used as the material of the dial substrate 4 and the refractive index of the ink.

  In this embodiment, the transparent polycarbonate dial substrate 4 is used, but other plastic materials such as acrylic can be used without any particular limitation.

  FIG. 8 is an enlarged partial sectional view of a timepiece dial according to Embodiment 2 of the present invention. In the said Example 1, since the convex part 6 was formed by pad-printing transparent or semi-transparent phenol resin ink on the surface or back surface of the dial substrate 4 in the shape of a dot, the color tone of a dial is colorless and semi-transparent. A satin appearance will be exhibited, and the solar cell disposed behind the dial will be less visible. On the other hand, in Example 2, the convex portion 6 is formed using the pigment ink in which the additive material is mixed in the pad printing ink, so that the dial has a unique color tone depending on the type of the pigment, and the convex portion 6 The additive material 14 in the portion 6 further increases the metallic sparkle, making the dark purple solar cell less visible from the upper surface of the dial.

  In Example 2, the pigment ink additive material 14 is a powder of fine metal color balls, metal foil, calcium carbonate powder, calcium oxide particles, titanium oxide particles, resin particles, glass spheres, and shells. Etc. are used. In addition, when the additive material 14 is used in a ball shape or in a particle state, it is preferably set to a size of 5 to 40 μm in order to mix and print with pigment ink.

  Here, in order to verify the effect of mixing the additive material 14, a circular plane having a diameter of 50 μm was printed by using pigment ink to which 10 to 20% by weight of a glass (silica) ball having a diameter of 10 μm was added. A plurality of convex portions 6 having a shape were formed on the surface of the dial substrate 4 with an area ratio of 25%. As a result, it was possible to obtain a timepiece dial having a more sparkling feeling as compared with the case where the convex portions 6 were formed only with ink under the same conditions.

  When the additive material 14 is mixed into the pigment ink, if the convex portion 6 is formed on the surface side of the dial substrate 4, the planar shape of the convex portion 6 may be visually recognized in a circular shape. In order to improve the appearance quality, it is more effective to form the convex portion 6 on the back surface of the dial substrate 4 because the shape of the convex portion 6 is less visible. This is because, in the case of the dial plate substrate 4 made of polycarbonate having a light transmittance of about 85%, when the plurality of convex portions 6 are formed on the back surface, the convex portions 6 are seen through the dial substrate 4. This is because the outline of the part 6 becomes unclear, and the state of regular arrangement in the form of dots becomes inconspicuous.

  Next, instead of the glass balls as the additive material 14, a plurality of convex portions 6 are formed on the dial substrate by printing using a pigment ink in which titanium oxide spheres, which are typical white pigments, are added in the same ratio as described above. 4 was formed on the back surface. As a result, compared with the case where a glass ball was added, a beautiful appearance that was white and increased in glitter was obtained. This is because the refractive index of titanium oxide is approximately twice that of glass or transparent resin (about 1.5), so the action of titanium oxide causes more complex refraction and reflection, and a unique and beautiful appearance. Because it brought

  In addition, it is effective to set the mixing ratio of the additive material 14 to the ink of various pigments to 5 to 30% by weight, and the range of 10 to 20% by weight is most preferable. A larger mixing ratio of the additive material 14 can obtain a desired appearance and is more effective. However, since the mixing ratio exceeds 20% by weight, the fluidity of the ink is lowered, the working efficiency is lowered, and a microscope is used. As a result of observation, the hemispherical protruding shape of the convex part 6 formed by printing is not formed, and the appearance quality may be impaired. On the other hand, when the mixing ratio is less than 10% by weight, the effect of adding the additive material gradually diminishes. For this reason, if the mixing ratio of the additive material 14 is 5 to 30% by weight, the effect of mixing the additive material can be obtained, and if it is in the range of 10 to 20% by weight, excellent appearance quality can be obtained. It becomes.

  In order to further increase the metallic appearance, gold or silver particles can be added directly to the pigment ink as the additive material 14. However, when the convex part 6 was formed with the ink which added 15 weight% of 3-5 micrometers silver microparticles | fine-particles, what was called a silver color tone was not obtained but it became a blackish color tone as a whole.

  Therefore, when a pigment ink in which 15% by weight of an additive material 14 having a silver film formed on the surface of a resin sphere having a diameter of 20 μm was used was used, a better silver tone was obtained. The same was true when gold was used. Further, when a silver coating was formed on a 30 μm resin sphere, a better silver tone and appearance were obtained. From the above results, it was confirmed that if the particles added to the pigment ink are too fine, the reflection area is small and the desired appearance is not exhibited, so that it is effective to use particles of about 20 μm as the additive material. Although the same effect can be obtained if gold or silver particles of about 20 μm are used as it is, it goes without saying that the cost of the additive becomes expensive. Similar results were obtained even when a glass sphere with a gold or silver film formed thereon was used instead of the resin sphere.

  Moreover, when the fine powder of shellfish was used as the additive material 14, an appearance having a white and pearly luster was obtained.

  Furthermore, when calcium carbonate particles were used as an additive material, the best result was obtained for whiteness because calcium carbonate is a component similar to shellfish. The appearance color tone of the timepiece dial has a pearl tone similar to the shellfish powder.

  Further, when a metal foil was added to the ink as the additive material 14, even better appearance quality was obtained. In the experiment, a trade name “ELG” (registered trademark) manufactured by Oike Industry Co., Ltd. was used as an additive material. This material is obtained by further adding aluminum vapor deposition to both sides of a substantially circular aluminum foil piece having a thickness of about 10 μm and an outer diameter of about 40 μm, and this material was added as an additive material 14 by 20% by weight. Phenol-based ink was formed by pad printing on the back surface of the dial substrate 4 with a convex portion 6 having a planar shape of a diameter of 50 μm and a mutual pitch of 80 μm (area ratio 30%). As a result, a timepiece dial having a high appearance quality with an appropriate silver tone and a sparkling feeling was obtained. Here, when the size of the convex portion 6 was set to a diameter of 100 μm, the glitter feeling was greatly retreated.

  From the above results, in this example in which the metal foil was added to the pigment, as shown in FIG. 8, the additive material 14 made of a substantially circular metal foil was added to the ink having a relatively high viscosity, which is slightly higher than the metal foil. When printed on a larger area, the metal foil contained in the convex portion 6 is not aligned in parallel (in a plane) with the dial substrate 4 but inclined in a diagonal direction so as to follow the hemispherical shape of the convex portion 6 Arranged. For this reason, metal foils arranged in a substantially hemispherical shape will reflect light, and will create a configuration similar to the example shown in Patent Document 1 in which convex portions are formed with a metal film, It will have a more sparkling satin and metallic appearance.

  In the present embodiment, the convex portion 6 is formed on the dial plate substrate 4 using a ready-made ink used for exhibiting a metallic color tone. Commercially available ink, for example, trade name “Mirror Ink” (registered trademark) manufactured by Teikoku Ink Manufacturing Co., Ltd. is described in JP-A-9-268269. It is an ink that consists of powder and gives the appearance that the printed surface has been subjected to metal deposition. The original use of this mirror ink is to finish the metallic color appearance by printing and forming the mirror ink with a desired thickness on the entire surface to be printed. In the present embodiment, by performing pad printing using this mirror ink, a convex portion is printed in a dot shape at a predetermined pitch on the surface of a dial plate substrate and the like, and an attempt is made to give a satin-like glitter feeling. .

  In this example, a mirror ink having a silver metallic color tone was used, and a convex portion having a 30 μm-diameter planar shape and a mutual pitch of 50 μm (area ratio of 28%) was formed on the back surface of the dial substrate by pad printing. A letter-shaped metal-tone dial was obtained. Since the mirror ink is an ink containing metallic powder, when it is printed on the entire surface, it has an appearance having a glossy surface like a mirror literally. However, as in this embodiment, the transparent resin substrate is formed in dots at a predetermined pitch. When printed at an area ratio of ˜40%, a satin-like gloss and appearance can be obtained, and light is transmitted according to the area ratio of printing, so it is also suitable for a watch dial equipped with solar cells. It becomes.

  In addition to Examples 1 to 3, it is also possible to produce a watch dial having a desired color tone and light transmittance by forming a number of similar dot-shaped convex portions using colored dye ink. It is.

  Also, in the embodiments of the present invention, the printing of the dot-shaped convex portions by the pad printing method has been exemplified, but it can also be formed by other offset printing or screen printing. However, in screen printing, an emulsifier film is formed so as to sandwich a mesh knitted with fine wires such as nylon, tetron, stainless steel, etc., and photoetching is performed on the positive film on which the printing pattern is formed to remove the emulsifier at the printing site. A printing plate is produced by the removal method. The lower limit of the wire used for the printing plate is a stainless wire with a diameter of 30 μm, and the mesh of the mesh at this time is about □ 50 μm. Thus, when forming a fine dot-shaped convex part by screen printing, it is the range which is not influenced by a mesh, and the outer diameter of a convex part becomes a lower limit about 100 micrometers. For this reason, screen printing is possible for the formation of protrusions exceeding 100 μm, but pad printing is suitable for forming protrusions smaller than this, as described in the respective embodiments.

  Further, FIG. 9 shows an enlarged partial sectional view of a timepiece dial according to Embodiment 4 of the present invention. In this example, the same convex part 26 as the convex part shown in Examples 2 and 3 described above is formed, dried, and then transparent acrylic ink is flattened with a thickness of 30 μm by screen printing so as to cover the convex part 6. Printed on. As a result, the color unevenness became inconspicuous compared with the case where the flat printed film 16 was not provided. Further, the printing film 16 formed here is not limited to acrylic as long as it is a transparent printing film. Further, if a highly viscous ink is used, it is possible to form a transparent printed film 16 up to a thickness of about 50 μm, and this has a higher effect.

  Further, FIG. 10 shows an enlarged partial sectional view of a timepiece dial according to Embodiment 5 of the present invention. In this embodiment, like the protrusions 6 shown in Example 2 or 3 described above, the rows of the protrusions 26 made of a material containing a pigment, and the same transparent as the protrusions 6 shown in Example 1 described above, are transparent. The rows of convex portions 36 made of material are alternately arranged. If comprised in this way, a soft feeling will be added to the brilliant metallic color tone and a high-class feeling will come out. In the present embodiment, the convex portions 26 made of the material added with the pigment and the convex portions 36 made of the transparent material are alternately arranged for each column. The islands may be arranged alternately. Moreover, the convex part 26 by the material which added the pigment in a present Example may be a convex part which consists of dye ink.

  The timepiece dial of the present invention is suitable for use as a timepiece in a timepiece equipped with a solar cell because it can set a brilliant metallic luster and light transmittance in a well-balanced manner. Further, when viewed from the front side, it is in a glittering state and the inside of the watch is not seen through, so that it can be used as a dial for a normal watch.

1 is a partial cross-sectional view showing a timepiece dial according to Embodiment 1 of the present invention. It is the elements on larger scale of the timepiece dial shown in FIG. It is a cross-sectional enlarged view which shows the original plate for printing in pad printing. FIG. 4 is an enlarged cross-sectional view showing a state where ink is attached to a pad from the printing original plate shown in FIG. 3. FIG. 5 is an enlarged cross-sectional view illustrating a state where the pad illustrated in FIG. 4 is separated from the printing original plate together with ink. It is a cross-sectional enlarged view which shows the state which pressed the pad shown in FIG. 5 on the dial board. FIG. 7 is an enlarged cross-sectional view showing a state where only ink is transferred from the pad shown in FIG. 6 to the dial plate substrate. It is a cross-sectional enlarged view which shows the timepiece dial which concerns on Example 2 of this invention. It is a cross-sectional enlarged view which shows the timepiece dial which concerns on Example 4 of this invention. It is a cross-sectional enlarged view which shows the timepiece dial which concerns on Example 5 of this invention.

Explanation of symbols

2 Dial for watch 4 Dial substrate 6, 26, 36 Convex 8 Printing master 8 a Concave 10 Ink 12 Pad 14 Additive material 16 Print coating

Claims (12)

A timepiece dial used by being arranged on a solar cell, wherein a plurality of convex portions having a circular shape, an oval shape, or a polygonal shape are formed on at least one surface of the dial substrate. . The timepiece dial according to claim 1, wherein the convex portion is formed by a printing method. 3. The timepiece dial according to claim 2, wherein the printing method is a pad printing method. 4. The timepiece character according to claim 1, wherein a diameter of a planar circle of the convex portion or a diameter of an oval or polygonal circumscribed circle is 20 to 80 μm. 5. Board. The timepiece dial according to claim 1, wherein the pitch of the convex portions is 50 to 180 μm. The timepiece dial according to claim 1, wherein a ratio of the convex portions is set to 15 to 50% of a surface area of the dial substrate. The timepiece dial according to claim 1, wherein the convex portion is made of a transparent material ink. The timepiece dial according to claim 7, wherein the convex portion is added with particles made of a transparent material having a refractive index higher than that of the main ink material. The ink for forming the convex portion by a printing method contains an additive material made of a light reflecting member such as metal powder, metal pieces, calcium carbonate particles, calcium oxide particles, titanium oxide particles, resin pieces, glass pieces, etc. The timepiece dial according to claim 7. The timepiece dial according to claim 9, wherein a convex portion including the additive material made of the light reflecting member and a transparent film covering the gap between the convex portions are provided. The timepiece dial according to claim 1, wherein the convex portion is made of colored dye ink. 7. The timepiece dial according to claim 1, wherein the convex portion includes a convex portion made of a colored dye ink and a convex portion made of a transparent material.

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