Method for manufacturing dial, and dial

Abstract

To provide a manufacturing method allowing efficient manufacture of a dial that includes a semi-transmissive substrate applied with decorative patterns on both front and rear surfaces.SOLUTION: A method for manufacturing a dial includes the steps of: preparing a semi-transmissive substrate having a first surface and a second surface in the front-and-rear relationship and a base material; forming a second decorative pattern including a gradation portion on the second surface of the semi-transmissive substrate; forming a backing decorative pattern on the second surface including the second decorative pattern; joining the semi-transmissive substrate and the base material to each other with the backing decorative pattern therebetween; and forming a first decorative pattern including a gradation portion on the first surface of the semi-transmissive substrate.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing a dial, and to a dial manufactured by said method. [Background technology]

[0002] Conventionally, watches using mother-of-pearl sheets (MOP sheets), which are plate-shaped components sliced ​​from mother-of-pearl shells, as dials have been known. For example, Patent Document 1 discloses a dial equipped with an MOP sheet. According to this document, a decorative pattern representing the veins and structure of a leaf is applied only to the rear surface of the MOP sheet, so that the decorative pattern can be observed through the sheet from the front of the MOP sheet. In addition, to ensure transparency, the thickness of the MOP sheet is thin, ranging from 50 μm to 300 μm.

[0003] In addition, as a means for enhancing the aesthetics of the dial, it is possible to apply a decorative pattern to the front surface of the MOP sheet in addition to the rear surface of the MOP sheet. In other words, it is possible to form a decorative pattern on both the front and back surfaces of the MOP sheet. The decorative pattern can be formed by painting, inkjet printing, or the like. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2021-510820 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when forming a decorative pattern on both sides of the MOP sheet, for example, by a painting method, there was a problem that the decorative pattern on the front side may be damaged when painting the back side after painting the front side. In detail, since the MOP sheet is thin and the decorative pattern is applied to the front side, there are few parts to hold, making it difficult to handle. The MOP sheet is also called a semi-transparent substrate. In other words, there has been a demand for a method for efficiently producing a dial having a semi-transparent substrate with decorative patterns on both sides. [Means for solving the problem]

[0006] A manufacturing method for a dial of one embodiment of the present application includes the steps of preparing a semi-transparent substrate having a first surface and a second surface that are in a reverse relationship, and a base material, forming a second decorative pattern including a gradation portion on the second surface of the semi-transparent substrate, forming a backing decorative pattern on the second surface that includes the second decorative pattern, joining the semi-transparent substrate and the base material via the backing decorative pattern, and forming a first decorative pattern including a gradation portion on the first surface of the semi-transparent substrate.

[0007] A dial according to one embodiment of the present application is a dial comprising a semi-transparent substrate having a first surface and a second surface which are in a front-back relationship, and a base material, wherein the first surface of the semi-transparent substrate is provided with a first decorative pattern including gradation coloring, and the second surface is provided with a second decorative pattern including gradation coloring, and the second surface including the second decorative pattern is provided with a backing decorative pattern, and the base material is bonded to the semi-transparent substrate via the backing decorative pattern, and the first decorative pattern is formed on the first surface of the semi-transparent substrate with the semi-transparent substrate, on which the second decorative pattern and the backing decorative pattern are formed, being bonded to the base material. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a front view of the timepiece according to the first embodiment. [Diagram 2] Cross-section of the dial. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 4 is a flowchart showing the flow of a method for manufacturing the dial. [Figure 6] 4A to 4C are diagrams showing an embodiment of a method for forming a decorative pattern. [Figure 7] 4A to 4C are diagrams showing an embodiment of a method for forming a decorative pattern. [Figure 8] FIG. 7 is a cross-sectional view of a dial according to a second embodiment. [Figure 9] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] EMBODIMENT 1 ***Clock Overview*** FIG. 1 is a front view of the timepiece according to this embodiment. The timepiece 100 of this embodiment is a three-hand analog wristwatch, and FIG. 1 is a front view thereof.

[0010] As shown in FIG. 1, a timepiece 100 is made up of an outer case 2, a dial 3, an hour hand 4A, a minute hand 4B, a second hand 4C, a crown 7, and the like. The exterior case 2 is a cylindrical body made of hard metal such as titanium or stainless steel. A movement (not shown), a dial 3, etc. are housed inside the exterior case 2. Of the two openings in the exterior case 2, the opening on the front side is closed with a transparent glass member such as sapphire glass, and the opening on the back side is closed with a back cover. The crown 7 is provided on the 3 o'clock side of the exterior case 2 and is used for adjusting the time, etc.

[0011] An hour hand 4A, a minute hand 4B, and a second hand 4C, which indicate time information, are attached to the center of the dial 3. The axis of each of the hour hand 4A, the minute hand 4B, and the second hand 4C is inserted into a through hole 23 (FIG. 2) of the dial 3. On the periphery of the dial 3, hour markers 5 are arranged corresponding to the 1 o'clock to 12 o'clock positions. Note that in Fig. 1, the hour markers 5 are Roman numerals, but are not limited to Roman numerals and may be, for example, Arabic numerals or bar indexes. In the following description, a plan view means that the dial 3 is viewed in a direction perpendicular to the surface of the dial 3, that is, from the axial direction of the pivot on which the hands are attached. The surface of each part means the surface facing the glass member, and the back surface of each part means the surface facing the back cover.

[0012] As shown in Fig. 1, the dial 3 is colored with a gradation that is lighter in the center and darker toward the periphery. In a preferred embodiment, the dial 3 has a semi-transparent substrate 20 (Fig. 2) made of a MOP sheet made of mother-of-pearl, and a decorative pattern including gradation coloring is formed on the front and back sides of the semi-transparent substrate 20. As a result, the dial 3 achieves a highly aesthetic design with delicate changes in color shade, in which the pattern of the MOP sheet and the decorative patterns on the front and back that include gradation coloring overlap each other.

[0013] ***Dial Composition*** Fig. 2 is a cross-sectional view of the dial, Fig. 3 is an exploded cross-sectional view showing the layered structure of the dial, and Fig. 4 is an exploded perspective view showing the layered structure of the dial. As shown in FIG. 2, the dial 3 has a configuration in which a semi-transparent substrate 20 is laminated on a base material 50. The base material 50 is a support for ensuring the strength of the dial 3, and is, for example, a brass plate material with a thickness of about 0.3 mm. However, the material is not limited to this, and any hard material may be used, such as nickel silver, copper, stainless steel, or an alloy of these, or a hard resin. The base material 50 is formed into a disk shape in plan view, and a through hole 53 through which the pointer shaft is inserted is formed in the center.

[0014] In a preferred embodiment, the semi-transparent substrate 20 is a mother-of-pearl sheet, which is a plate-shaped member formed by slicing the shell of a mother-of-pearl shell used in pearl farming, such as a white-lipped pearl oyster. The mother-of-pearl sheet is also called an MOP sheet. The semi-transparent substrate 20 has a thickness of 50 μm or more and 200 μm or less in order to ensure light transmission. In a preferred embodiment, the thickness is about 100 μm in consideration of ease of handling. In other words, the semi-transparent substrate 20 is made of mother-of-pearl. The material of the semi-transparent substrate 20 is not limited to the MOP sheet, and may be any plate-shaped member having light transmission, such as a resin having light transmission, such as polycarbonate. In other words, the semi-transparent substrate 20 may be made of polycarbonate. The semi-transparent substrate 20 is formed in a flat disk shape, and has a through hole 23 formed in the center thereof through which the pointer shaft is inserted.

[0015] A first decorative pattern 10 is formed on a first surface 20a of the semi-transparent substrate 20. A second decorative pattern 30 is formed on a second surface 20b of the semi-transparent substrate 20. Details of the first decorative pattern 10 and the second decorative pattern 30 will be described later. A backing decorative pattern 40 is formed on the second surface 20b of the semi-transparent substrate 20 so as to cover the second decorative pattern 30. The base material 50 and the semi-transparent substrate 20 are bonded together by an adhesive layer 45. In a preferred embodiment, the adhesive layer 45 is a double-sided tape, and bonds the semi-transparent substrate 20 and the base material 50 together via the decorative backing pattern 40. The adhesive layer 45 is directly bonded to the second surface 20b of the semi-transparent substrate 20 near the center where the decorative backing pattern 40 is not present. The adhesive layer 45 is a ring-shaped double-sided tape that is slightly smaller than the base material 50, and has a hole 43 that is slightly larger than the through-hole 53 at its center.

[0016] ***Details of the decoration pattern*** As shown in FIG. 3, the outer peripheral edge 11 of the first decorative pattern 10 is located at the same position as the outer peripheral edge 24 of the semi-transparent substrate 20 in a plan view, and the inner peripheral edge 12 is located outside the middle position in the radial direction from the through hole 23 of the semi-transparent substrate 20 to the outer periphery, that is, the position of 1 / 2 the radius. The first decorative pattern 10 has a gradation portion from the inner peripheral edge 12 to the outer peripheral edge 11. The gradation portion means a portion colored by continuously or stepwise changing the concentration by painting or printing a surface coloring material. Specifically, the coloring density of the coloring material can be changed by increasing or decreasing the amount of application or printing of the surface coloring material per unit area, thereby changing the concentration of the color to be colored continuously or stepwise. In addition, in FIG. 2 and FIG. 3, the gradation is represented diagrammatically by increasing the film thickness on the outer peripheral side of the semi-transparent substrate 20, which is the part where the color of the first decorative pattern 10 is dark, and gradually decreasing the film thickness toward the inner peripheral side.

[0017] The outer peripheral edge 31 of the second decorative pattern 30 is located at the same position as the outer peripheral edge 24 of the semi-transparent substrate 20 in a plan view, and the inner peripheral edge 32 is located inside the intermediate position in the radial direction from the through hole 23 of the semi-transparent substrate 20 to the outer periphery, that is, the position of 1 / 2 the radius. Specifically, the second decorative pattern 30 is formed between the outer peripheral edge 24 of the second surface 20b of the semi-transparent substrate 20 and a position of approximately 3 / 4 of the radius from the outer peripheral edge 24 in the radial direction. The second decorative pattern 30 is concentric with the through hole 23 as the center, and the area from the inner peripheral edge 32 to the outer peripheral edge 31 is a gradation portion. In FIG. 3, the gradation is expressed by increasing the film thickness on the outer peripheral side of the semi-transparent substrate 20, which is the part where the color of the second decorative pattern 30 is dark, and gradually decreasing the film thickness toward the inner peripheral side. The thickness of the first decorative pattern 10 is 10 μm or less, i.e., several μm, in the dark colored portion, and gradually decreases from several μm to 0 μm from the dark colored portion to the light colored portion. The thickness of the second decorative pattern 30 is similar.

[0018] The backing decorative pattern 40 is colored with a single color with a substantially constant color density, and differs from the first decorative pattern 10 and the second decorative pattern 30 in that the color density does not change. The backing decorative pattern 40 is formed thicker than the first decorative pattern 10 and the second decorative pattern 30, and prevents the base material 50 from being observed through the glass.

[0019] 4, the first decorative pattern 10 is an annular pattern whose color gradually darkens from the inner peripheral edge 12 to the outer peripheral edge 11. The second decorative pattern 30 is an annular pattern whose color gradually darkens from the inner peripheral edge 32 to the outer peripheral edge 31. Here, the diameter of the inner peripheral edge 12 of the first decorative pattern 10 is larger than the diameter of the inner peripheral edge 32 of the second decorative pattern 30. The diameter of the inner peripheral edge 32 of the second decorative pattern 30 is larger than the diameter of the through hole 23 of the semi-transparent substrate 20. As a result, multiple regions with different overlapping degrees of the first decorative pattern 10, the semi-transparent substrate 20, the second decorative pattern 30, and the backing decorative pattern 40 are formed, so that a variety of delicate patterns are formed. In other words, in a plan view, the first decorative pattern 10 overlaps the second decorative pattern 30 as a whole, and the second decorative pattern 30 has an area overlapping with the first decorative pattern 10 and an area not overlapping with the first decorative pattern 10.

[0020] 3, in a plan view of the dial 3, a ring-shaped first region 61 in which the semi-transparent substrate 20 and the backing decorative pattern 40 are laminated is visible around the through-hole 23. In addition, a ring-shaped second region 62 in which the semi-transparent substrate 20, the second decorative pattern 30, and the backing decorative pattern 40 are laminated is visible around the first region 61. A ring-shaped third region 63 is visible around the second region 62, in which the first decorative pattern 10, the semi-transparent substrate 20, the second decorative pattern 30, and the backing decorative pattern 40 are laminated. In the peripheral portion of the third region 63, the dark colored parts of the first decorative pattern 10 and the second decorative pattern 30 overlap, so that the backing decorative pattern 40 is hardly observed.

[0021] As an example of the color tone, the first decorative pattern 10 is black, the second decorative pattern 30 is light blue, and the backing decorative pattern 40 is blue. The color tones are not limited to these, and may be set appropriately according to the concept and design of the watch 100. For example, the first decorative pattern 10 may be dark navy blue, the second decorative pattern 30 may be pink, and the backing decorative pattern 40 may be purple. Alternatively, the first decorative pattern 10 may be dark green, the second decorative pattern 30 may be yellow-green, and the backing decorative pattern 40 may be green.

[0022] ***How ​​the dial is manufactured*** Fig. 5 is a flow chart showing the flow of a method for manufacturing the dial. Fig. 6 and Fig. 7 are diagrams showing one embodiment of a method for forming a decorative pattern. Here, the manufacturing method of the dial 3 will be explained mainly with reference to FIG. 5, and with other drawings as appropriate.

[0023] In step S10, the semi-transparent substrate 20 and the base material 50 are prepared. In other words, in this step, the semi-transparent substrate 20 having a first surface 20a and a second surface 20b, which are in a back-to-back relationship, and the base material 50 are prepared. In step S11, the second decorative pattern 30 is formed on the second surface 20b of the semi-transparent substrate 20. In a preferred embodiment, the second decorative pattern 30 is formed by a painting method. In other words, in this step, the second decorative pattern 30 including a gradation portion is formed on the second surface 20b of the semi-transparent substrate 20.

[0024] 6 shows one embodiment of forming the second decorative pattern 30 by painting, in which the semi-transparent substrate 20 is set on the rotating table 70. The rotating table 70 is a cylindrical rotating jig that rotates in the direction of the arrow around a rotation axis 90. A mounting portion 72, which is a circular convex portion with a diameter slightly smaller than that of the semi-transparent substrate 20, is provided on the upper surface of the rotating table 70. Three positioning pins 71 are provided on the periphery of the rotating table 70. The three positioning pins 71 are arranged at intervals of an angle of 120° around the rotation axis 90. 6, the semi-transparent substrate 20 is set on a mounting portion 72 of a turntable 70 with the second surface 20b facing up. The outer periphery of the semi-transparent substrate 20 is fixed by three positioning pins 71. As a result, the semi-transparent substrate 20 rotates about the through-hole 23 as the turntable 70 rotates.

[0025] 6, a spray gun 80 is disposed above the rotating table 70. The nozzle of the spray gun 80 is directed toward the outer periphery of the semi-transparent substrate 20 that rotates about the through-hole 23. The nozzle direction of the spray gun 80 and the color tone of the paint set in the spray gun 80 are adjusted in advance to match the second decoration pattern 30. By discharging paint onto the second surface 20b of the semi-transparent substrate 20 with the spray gun 80 while rotating the turntable 70, it is possible to apply a gradation coloring in which the color becomes lighter from the outer periphery of the semi-transparent substrate 20 toward the inside in a concentric pattern centered on the through-hole 23. The range in which the second decorative pattern 30 is formed can be changed by adjusting the aperture of the nozzle of the spray gun 80. By narrowing the nozzle of the spray gun 80 to narrow the range in which the paint is discharged, the range in which the second decorative pattern 30 is formed becomes narrower, and by widening the nozzle of the spray gun to widen the range in which the paint is discharged, the range in which the second decorative pattern 30 is formed can be widened.

[0026] After the second decorative pattern 30 is formed, in a preferred embodiment, the paint is dried while the semi-transparent substrate 20 is set on the turntable 70. The semi-transparent substrate 20 may be removed from the turntable 70 before drying. Since the turntable 70 is provided with a mounting portion 72, the semi-transparent substrate 20 can be removed without touching the second decorative pattern 30 by gripping the lower part of the peripheral portion of the semi-transparent substrate 20 (the first surface 20a side).

[0027] In step S12, the backing decoration pattern 40 is formed. In a preferred embodiment, the backing decoration pattern 40 is solid-printed by screen printing on the entire surface of the second surface 20b of the semi-transparent substrate 20 except for the through-holes 23. As a result, the backing decoration pattern 40 is formed with a substantially constant thickness on the entire surface of the second surface 20b of the semi-transparent substrate 20 including the second decoration pattern 30. The backing decoration pattern 40 has a substantially constant thickness and is typically a pattern of the same color over the entire surface. In other words, in this step, the backing decoration pattern 40 is formed on the second surface 20b including the second decoration pattern 30. The method of forming the backing decoration pattern 40 is not limited to the screen printing method, and a coating method or an inkjet printing method may also be used.

[0028] In step S13, the semi-transparent substrate 20 and the base material 50 are bonded together by an adhesive layer 45. In a preferred embodiment, as shown in FIG. 4, an adhesive layer 45 made of a double-sided tape is attached to the surface of the base material 50 in advance, and the second surface 20b of the semi-transparent substrate 20 is bonded onto the adhesive layer 45. In other words, in this step, the semi-transparent substrate 20 and the base material 50 are bonded together via the backing decorative pattern 40. The adhesive layer 45 is not limited to a double-sided tape, and an adhesive may be used.

[0029] In step S14, the first decorative pattern 10 is formed on the first surface 20a of the semi-transparent substrate 20. In a preferred embodiment, the first decorative pattern 10 is formed by a painting method, similar to the second decorative pattern 30. In other words, in this step, the first decorative pattern 10 including a gradation portion is formed on the first surface 20a of the semi-transparent substrate 20.

[0030] As shown in FIG. 7, a turntable 75 different from the turntable 70 in FIG. 6 is used to form the first decorative pattern 10. The turntable 75 is different from the turntable 70 in that the upper surface of the turntable 75 is flat and does not have a mounting portion 72. The other configurations of the turntable 75 are the same as those of the turntable 70. As shown in FIG. 7, the composite of the semi-transparent substrate 20 and the base material 50 is placed on the upper surface of the turntable 75 with the base material 50 facing down. Since the composite is based on the base material 50 having sufficient thickness and strength, the side of the base material 50 can be easily gripped even without the mounting portion 72. A spray gun 80 is disposed above the turntable 75.

[0031] The nozzle of the spray gun 80 is directed toward the outer periphery of the first surface 20a of the semi-transparent substrate 20, which rotates around the through-hole 23. The nozzle direction of the spray gun 80 and the color tone of the paint set in the spray gun 80 are adjusted in advance to match the first decorative pattern 10. By discharging paint with the spray gun 80 onto the first surface 20a of the semi-transparent substrate 20 while rotating the turntable 75 about the rotation axis 90, it is possible to apply a gradation coloring in which the color becomes lighter from the outer periphery of the semi-transparent substrate 20 toward the inside in a concentric pattern centered on the through-hole 23. The range in which the first decorative pattern 10 is formed can be changed by adjusting the aperture of the nozzle of the spray gun 80. By narrowing the nozzle of the spray gun 80 to narrow the range in which the paint is discharged, the range in which the first decorative pattern 10 is formed becomes narrower, and by widening the nozzle of the spray gun to widen the range in which the paint is discharged, the range in which the first decorative pattern 10 is formed can be widened.

[0032] After the first decorative pattern 10 is formed, in a preferred embodiment, the paint is dried with the dial 3 set on the turntable 75. Note that the dial 3 may be removed from the turntable 75 before drying, and the paint may then be dried. This completes the dial 3 shown in FIG.

[0033] In the above description, the first decorative pattern 10 and the second decorative pattern 30 are formed by a painting method, but the present invention is not limited to this, and any method capable of forming a decorative pattern including a gradation portion may be used, for example, an inkjet printing method may be used. In other words, the first decorative pattern 10 and the second decorative pattern 30 are formed by painting or inkjet printing.

[0034] As described above, the manufacturing method for the dial 3 and the dial 3 of this embodiment provide the following advantages. A manufacturing method for the dial 3 includes the steps of preparing a semi-transparent substrate 20 having a first surface 20a and a second surface 20b, which are opposite surfaces, and a base material 50; forming a second decorative pattern 30 including a gradation portion on the second surface 20b of the semi-transparent substrate 20; forming a backing decorative pattern 40 on the second surface 20b including the second decorative pattern 30; bonding the semi-transparent substrate 20 and the base material 50 via the backing decorative pattern 40; and forming a first decorative pattern 10 including a gradation portion on the first surface 20a of the semi-transparent substrate 20.

[0035] According to this manufacturing method, the second decorative pattern 30 and the backing decorative pattern 40 are formed on the second surface 20b of the semi-transparent substrate 20, and then the semi-transparent substrate 20 and the base material 50 are joined to form a composite, and then the first decorative pattern 10 is formed on the first surface 20a. Therefore, unlike conventional methods in which the decorative pattern on the front surface may be damaged when painting the back surface after painting the front surface, the first decorative pattern 10 on the front surface is finally formed in the easy-to-handle composite state backed by the base material 50, and therefore damage to the decorative pattern can be suppressed. Therefore, it is possible to provide a method for efficiently producing a dial 3 having a semi-transparent substrate 20 with decorative patterns on both the front and back sides.

[0036] The first decorative pattern 10 and the second decorative pattern 30 are formed by painting or inkjet printing. This makes it possible to form the first decorative pattern 10 and the second decorative pattern 30 that include a gradation portion.

[0037] In addition, in a plan view, the first decorative pattern 10 entirely overlaps with the second decorative pattern 30, and the second decorative pattern 30 has an area overlapping with the first decorative pattern 10 and an area not overlapping with the first decorative pattern 10. This allows the first decorative pattern 10, the semi-transparent substrate 20, the second decorative pattern 30 and the backing decorative pattern 40 to overlap in different areas, resulting in the formation of diverse and intricate patterns.

[0038] Moreover, the semi-transparent substrate 20 is made of mother-of-pearl. This makes it possible to provide a dial 3 having a diverse and intricate pattern by taking advantage of the inherent pattern of the MOP sheet.

[0039] Moreover, the semi-transparent substrate 20 is made of polycarbonate. This makes it possible to provide a dial 3 that is less expensive than a MOP sheet and has a diverse and intricate pattern.

[0040] The dial 3 comprises a semi-transparent substrate 20 having a first surface 20a and a second surface 20b which are in a front-back relationship, and a base material 50. The first surface 20a of the semi-transparent substrate 20 is provided with a first decorative pattern 10 including gradation coloring, and the second surface 20b is provided with a second decorative pattern 30 including gradation coloring. The second surface 20b including the second decorative pattern 30 is provided with a backing decorative pattern 40. The base material 50 is bonded to the semi-transparent substrate 20 via the backing decorative pattern 40. The first decorative pattern 10 is formed on the first surface 20a of the semi-transparent substrate 20 with the semi-transparent substrate 20, on which the second decorative pattern 30 and the backing decorative pattern 40 are formed, bonded to the base material 50. This makes it possible to provide a dial 3 having a variety of intricate designs, comprising a semi-transparent substrate 20 with decorative patterns on both the front and back sides.

[0041] EMBODIMENT 2 ***Different dial styles*** Fig. 8 is a cross-sectional view of the dial according to embodiment 2, and corresponds to Fig. 2. Fig. 9 is an exploded perspective view showing the layered structure of the dial, and corresponds to Fig. 4. In the above embodiment, the dial 3 is described as being circular in plan view, but this is not limited thereto, and it may be elliptical or polygonal, for example, rectangular. In the following, the same parts as those in the above embodiment are given the same numbers, and duplicated explanations will be omitted.

[0042] As shown in FIG. 9, the dial 33 of this embodiment is a quadrangular dial in a plan view. The dial 33 is configured by laminating a semi-transparent substrate 21 on a rectangular base material 51. The semi-transparent substrate 21 is configured from a flat rectangular plate of a synthetic resin having light-transmitting properties, such as polycarbonate. As shown in Fig. 8, a first decorative pattern 15 is formed on a first surface 21a of the semi-transparent substrate 21, and a second decorative pattern 35 is formed on a second surface 21b. A backing decorative pattern 41 is formed on the second surface 21b of the semi-transparent substrate 21, covering the second decorative pattern 35. The base material 51 and the semi-transparent substrate 21 are joined by an adhesive layer 46 made of double-sided tape. In Fig. 8, the base material 51 and the semi-transparent substrate 21 are shown separated from each other to make the configuration easier to understand. The manufacturing method of the dial 33 is the same as that of the dial 3. More specifically, the second decorative pattern 35 and the backing decorative pattern 41 are formed on the second surface 21b of the semi-transparent substrate 21, and then the semi-transparent substrate 21 and the base material 51 are joined to form a composite, and then the first decorative pattern 15 is formed on the first surface 21a.

[0043] The first decorative pattern 15 is formed by applying gradation coloring to the first surface 21a of the semi-transparent substrate 21 with a surface coloring material by inkjet printing. As shown in Fig. 9, the first decorative pattern 15 is formed in a straight line extending in a direction connecting the 12 o'clock and 6 o'clock indexes (not shown) of the dial 33. The width dimension of the first decorative pattern 15, i.e., the dimension of the dial 33 in the 3 o'clock and 9 o'clock directions, is constant, and in this embodiment, the dimension is approximately half the dimension from the central through hole 23 of the semi-transparent substrate 21 to the outer periphery in the 3 o'clock and 9 o'clock directions.

[0044] The second decorative pattern 35 is formed by gradationally coloring the second surface 21b of the semi-transparent substrate 21 with a rear surface coloring material by inkjet printing. In this embodiment, the second decorative pattern 35, like the first decorative pattern 15, is formed in a straight line extending in a direction connecting the 12 o'clock and 6 o'clock indexes (not shown) of the dial 33. The width dimension of the second decorative pattern 35, i.e., the dimensions of the dial 33 in the 3 o'clock and 9 o'clock directions, is constant and is approximately 3 / 4 of the dimension from the through-hole 23 in the center of the semi-transparent substrate 21 to the outer periphery in the 3 o'clock and 9 o'clock directions. For this reason, the width dimension of the second decorative pattern 35 is larger than the width dimension of the first decorative pattern 15.

[0045] The first decorative pattern 15 and the second decorative pattern 35 are colored in a gradation in which the color is dark at the center position connecting the 12 o'clock and 6 o'clock directions and becomes lighter toward the 3 o'clock and 9 o'clock directions. For this reason, Fig. 8 shows that the first decorative pattern 15 and the second decorative pattern 35 have a large film thickness in the center portion near the through hole 23 and gradually become thinner toward the periphery in the 3 o'clock and 9 o'clock directions, which diagrammatically shows that the color of the first decorative pattern 15 and the second decorative pattern 35 gradually becomes lighter from the center toward the periphery.

[0046] As shown in FIG. 8, dial 33 has three regions, namely, a first region 81, a second region 82, and a third region 83, extending from the center connecting the 12 o'clock and 6 o'clock indexes toward the 3 o'clock and 9 o'clock sides in a plan view. These regions each have a different layer structure, which improves the design of dial 33. The first region 81 on the center side of the dial 33 has a layered structure in which the first decorative pattern 15 is laminated on the first surface 21a of the semi-transparent substrate 21 and the second decorative pattern 35 is laminated on the second surface 21b, thereby realizing a delicate design in which changes in color shade due to the gradation coloring of the first decorative pattern 15 and the second decorative pattern 35 are overlapped.

[0047] Since the second region 82 has a layered structure in which the second decorative pattern 35 is laminated on the second surface 21b of the semi-transparent substrate 21, a design in which the color shades are changed by gradation coloring of the second decorative pattern 35 can be realized. The third region 83 can realize a design that makes use of the semi-transparent substrate 21. Furthermore, since the first decorative pattern 15 and the second decorative pattern 35 are not laminated in the third region 83, the light transmittance can be improved. Therefore, particularly when realizing a watch in which a solar panel is arranged on the back surface of the dial 33, the power generation efficiency can be improved.

[0048] As described above, the manufacturing method for the dial 33 and the dial 33 of this embodiment provide the following advantages. The manufacturing method of the dial 33 is the same as that of the dial 3, and involves forming a second decorative pattern 35 and a backing decorative pattern 41 on the second surface 21b of the semi-transparent substrate 21, and then bonding the semi-transparent substrate 21 and the base material 51 to form a composite, and then forming a first decorative pattern 15 on the first surface 21a. Therefore, it is possible to provide a manufacturing method capable of efficiently manufacturing a dial 33 having a semi-transparent substrate 21 with a decorative pattern on both sides. Note that, although a rectangular dial has been used as an example in the above, the shape is not limited to this and may be an ellipse or polygon. For example, the above manufacturing method can also be applied to a tonneau-shaped or triangular dial. [Explanation of symbols]

[0049] 2...outer case, 3...dial, 4A...hour hand, 4B...minute hand, 4C...second hand, 5...index, 10...first decorative pattern, 11...outer edge, 15...first decorative pattern, 12...inner edge, 20...semi-transparent substrate, 20a...first surface, 20b...second surface, 21...semi-transparent substrate, 21a...first surface, 21b...second surface, 23...through hole, 24...outer edge, 30...second decorative pattern, 31...outer edge, 32...inner edge, 33...dial, 35...second decorative pattern, 40...backing decorative pattern, 41...backing decorative pattern, 43...hole, 45...adhesive layer, 46...adhesive layer, 50...substrate, 51...substrate, 53...through hole, 61...first region, 62...second region, 63...third region, 70...rotating table, 71...positioning pin, 72...mounting portion, 75...rotating table, 80...spray gun, 81...first region, 82...second region, 83...third region, 90...rotating shaft, 100...clock.

Claims

1. providing a semi-transparent substrate having a first surface and a second surface in a reverse relationship, and a base material; forming a second decorative pattern including a gradation portion on the second surface of the semi-transparent substrate; forming a backing decorative pattern on the second surface including the second decorative pattern; bonding the semi-transparent substrate and the base material via the backing decorative pattern; forming a first decorative pattern including a gradation portion on the first surface of the semi-transparent substrate; How the dial is manufactured.

2. The first decorative pattern and the second decorative pattern are formed by painting or inkjet printing. A method for manufacturing the dial according to claim 1.

3. In plan view, the first decorative pattern entirely overlaps the second decorative pattern, The second decorative pattern has an area overlapping with the first decorative pattern and an area not overlapping with the first decorative pattern. A method for manufacturing the dial according to claim 2.

4. The semi-transparent substrate is made of mother-of-pearl. A method for manufacturing the dial according to claim 2.

5. The semi-transparent substrate is made of polycarbonate. A method for manufacturing the dial according to claim 2.

6. A dial comprising a semi-transparent substrate having a first surface and a second surface that are reversed, and a base material, a first decorative pattern including a gradation coloring is provided on the first surface of the semi-transparent substrate, and a second decorative pattern including a gradation coloring is provided on the second surface of the semi-transparent substrate; The second surface including the second decorative pattern is provided with a backing decorative pattern, the base material is bonded to the semi-transparent substrate via the backing decoration pattern; the first decorative pattern is formed on the first surface of the semi-transparent substrate in a state in which the semi-transparent substrate, on which the second decorative pattern and the backing decorative pattern are formed, is bonded to the base material. Dial.

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