Timepiece component and timepiece

Abstract

To provide a timepiece component and a timepiece with a desired color.SOLUTION: A timepiece component 3 is a timepiece dial that includes: a multilayer film 50 formed by PVD; and a translucent resin layer 60 formed on the multilayer film 50, the thickness T of the translucent resin layer 60 being a predetermined thickness T.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a timepiece component and a timepiece. [Background technology]

[0002] In addition to being functional as a practical item, watches are also required to have excellent aesthetic appeal as decorative items. It is known that precious metals are used for watch parts such as the dial and case to enhance the appearance, but precious metals are generally expensive and, due to factors such as limited reserves, excessive use of precious metals must be restricted.

[0003] For example, Patent Document 1 discloses a method for laminating a color-tuning layer made of multiple oxide films on a base material with metallic luster, thereby achieving a watch component with an appearance and texture equivalent to that of a component made of precious metal material. By laminating multiple oxide films and adjusting the light reflectance and color tone, a color tone with the desired brightness, saturation, and hue can be obtained while taking advantage of the metallic luster of the base material. Furthermore, a clear layer is disposed on the top surface of the oxide film to protect the laminated oxide film. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2023-4622 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the watch component described in Patent Document 1 had a problem in that the clear layer for protecting the oxide film discolors depending on the thickness of the clear layer, making it impossible to obtain the desired color with the color-tuning layer. [Means for solving the problem]

[0006] The timepiece component is a timepiece dial in which a multilayer film is formed by PVD and a translucent resin layer is formed thereon, the translucent resin layer having a predetermined thickness.

[0007] The timepiece has a timepiece dial in which a multilayer film is formed by PVD and a translucent resin layer is formed thereon, and the translucent resin layer has a predetermined thickness. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a front view showing the general structure of a timepiece equipped with timepiece components according to a first embodiment. [Figure 2] 1 is a cross-sectional view showing the general structure of a timepiece equipped with timepiece components according to a first embodiment. [Figure 3] Enlarged view of part A in Figure 2. [Figure 4] FIG. 10 is a graph showing the relationship between the amount of color change in a multilayer film and the thickness of a light-transmitting resin layer. [Figure 5] 1 is a table showing the thicknesses and refractive indices of the light-transmitting resin layer and the multilayer film. DETAILED DESCRIPTION OF THE INVENTION

[0009] First, a wristwatch will be taken as an example of a timepiece 1 equipped with timepiece components 3 according to this embodiment, and an explanation will be given with reference to FIGS. 1 and 2. FIG. For ease of explanation, the following figures illustrate three mutually perpendicular axes: the X-axis, the Y-axis, and the Z-axis. The direction along the X-axis is referred to as the "X-direction," the direction along the Y-axis as the "Y-direction," and the direction along the Z-axis as the "Z-direction." The tip of the arrow in each axial direction is referred to as the "plus side," the base end as the "minus side," the plus side of the Z direction as the "front," and the minus side of the Z direction as the "back."

[0010] As shown in Figures 1 and 2, a timepiece 1 according to this embodiment comprises an outer case 2, a case back 9, a crystal 5, and timepiece components 3. The outer case 2 is constructed by fitting a bezel 22 made of ceramic or metal to a cylindrical case body 21 made of metal. The disc-shaped timepiece component 3 is positioned on the inner periphery of this bezel 22 via an annular dial ring 6 made of plastic. A crown 7 is provided on the side of the outer case 2 at the 3 o'clock position on the timepiece.

[0011] Of the two openings in the metal case body 21 of the watch 1, the opening on the front side, which is on the positive side in the Z direction, is covered by the crystal 5 via the bezel 22, and the opening on the back side, which is on the negative side in the Z direction, is covered by a back cover 9 made of metal. Metallic materials such as brass, stainless steel, and titanium are used for the case body 21 and back cover 9. Note that the case body 21 may also be made of materials other than metal, such as resin.

[0012] Next, the internal structure housed in the exterior case 2 of the timepiece 1 will be described. As shown in FIG. 2, the space surrounded by the outer case 2, back cover 9, and crystal 5 contains a dial ring 6, a time display unit 10 including timepiece components 3, and a movement 13.

[0013] The outer peripheral edge of the dial ring 6 contacts the inner peripheral surface of the bezel 22, and the dial ring 6 has a flat portion with one surface parallel to the crystal 5 and an inclined portion inclined toward the timepiece component 3. The dial ring 6 is annular in plan view and cone-shaped in cross section.

[0014] The time display unit 10 is powered by power such as a battery and displays the time. It has hour hand 4A, minute hand 4B, and second hand 4C, which are hands, between the watch parts 3 and the crystal 5, and is located inside the dial ring 6.

[0015] A movement 13 is disposed between the timepiece component 3 and the back cover 9. A movement conventionally used in wristwatches can be used for the movement 13. In this embodiment, the movement 13 is provided on the main plate 12 with a battery (not shown), a step motor (not shown) driven by the battery's power, and a wheel train (not shown) driven by the step motor. The movement 13 drives the hour hand 4A, minute hand 4B, and second hand 4C shown in Fig. 1 via a step motor and a wheel train. The hour hand 4A, minute hand 4B, and second hand 4C are attached to a pointer shaft 11 provided at the center of the plane of the timepiece component 3. A winding stem 8 is attached to the movement 13, and a crown 7 is attached to the end of the winding stem 8.

[0016] Next, the timepiece component 3 according to this embodiment will be explained with reference to FIGS.

[0017] The timepiece component 3 is a dial, which, as shown in Figure 3, is a timepiece dial in which a multilayer film 50 is formed on a disk-shaped substrate 30 by PVD (Physical Vapor Deposition), and a translucent resin layer 60 is formed on top of that. The substrate 30 is made of metal, glass, ceramic, or the like, and has a front surface 31 facing the crystal 5 and a back surface 32 facing the back cover 9. A Ni plating layer 40 is formed on the front surface 31 of the substrate 30, and the multilayer film 50 is formed on the Ni plating layer 40, and the translucent resin layer 60 is formed on the multilayer film 50.

[0018] The multilayer film 50 is a color-tuning layer, and is formed by laminating a plurality of oxide films, etc., by PVD in order to achieve the desired color for the timepiece component 3, which is the dial. Note that the order and thickness of the oxide films, etc., of the multilayer film 50 vary depending on the desired color tone, and details of this will be described later.

[0019] The translucent resin layer 60 is a clear layer, and is formed to protect the multilayer film 50 by using a coating device to coat the entire surface of the multilayer film 50 with an acrylic resin or the like, then rotating the substrate 30 and using centrifugal force to diffuse and coat the entire surface of the multilayer film 50. Furthermore, by providing the translucent resin layer 60 on the outermost surface of the timepiece component 3, the three-dimensional effect and transparency are enhanced, resulting in a dial with a more luxurious feel.

[0020] As shown in FIG. 4, when the thickness T of the light-transmitting resin layer 60 is small, discoloration due to a change in the refractive index of the light-transmitting resin layer 60 is significant, making it difficult to obtain the desired color from the multilayer film 50, which is a toning layer. However, when the thickness exceeds a certain thickness, discoloration of the light-transmitting resin layer 60 disappears, making it possible to obtain the desired color. Therefore, as shown in FIG. 4, the thickness T of the light-transmitting resin layer 60 that can stably obtain the desired color from the multilayer film 50 is a predetermined thickness T. Specifically, the predetermined thickness T is 10 μm or more and 100 μm or less, and more preferably 30 μm or more and 70 μm or less. Note that when the thickness T of the light-transmitting resin layer 60 is thicker than 100 μm, the amount of coating required to form the light-transmitting resin layer 60 increases, resulting in reduced productivity.

[0021] Next, a red multilayer film 50 will be described as an example of a multilayer film 50 that can give the timepiece component 3, which is the dial, a desired color. 3 and 5, the red multilayer film 50 is formed by laminating 0.1 μm of SiO2, 0.07 μm of Cr, 0.21 μm of Al2O3, 0.01 μm of Cr, 0.11 μm of Al2O3, 0.08 μm of Nb2O5, and 0.12 μm of SiO2 in this order on the Ni plating layer 40. Note that reference numerals 51 to 57 in FIG. 5 correspond to the reference numerals 51 to 57 of the multilayer film 50 in FIG. 3.

[0022] As described above, the timepiece component 3 according to this embodiment is a timepiece dial in which a multilayer film 50 is formed by PVD and a translucent resin layer 60 is formed thereon, and the translucent resin layer 60 has a predetermined thickness T, which is 10 μm or more and 100 μm or less, and more preferably 30 μm or more and 70 μm or less. Therefore, the desired color of the multilayer film 50 can be stably obtained. Furthermore, the timepiece 1 according to this embodiment is equipped with timepiece components 3 that have the desired color, making it highly aesthetically pleasing.

[0023] In this embodiment, the dial has been used as an example of the timepiece part 3, but this is not limited to this, and the timepiece part 3 includes, in addition to the dial, a dial ring 6, a moon phase disc, and a calendar. [Explanation of symbols]

[0024] 1...watch, 2...exterior case, 3...watch parts, 4A...hour hand, 4B...minute hand, 4C...second hand, 5...crystal, 6...dial ring, 7...crown, 8...winding stem, 9...back cover, 10...time display section, 11...hand axis, 12...main plate, 13...movement, 21...case body, 22...bezel, 30...base material, 31...surface, 32...back, 40...nickel plating layer, 50...multilayer film, 60...translucent resin layer, T...thickness.

Claims

1. A timepiece dial in which a multilayer film is formed by PVD and a light-transmitting resin layer is formed on top of the multilayer film, The thickness of the light-transmitting resin layer is a predetermined thickness. Watch parts.

2. The predetermined thickness is 10 μm or more and 100 μm or less.

2. The timepiece component according to claim 1.

3. The predetermined thickness is 30 μm or more and 70 μm or less.

3. The timepiece component according to claim 2.

4. The timepiece component is a dial.

3. The timepiece component according to claim 1 or 2.

5. A timepiece having a timepiece dial on which a multilayer film is formed by PVD and a light-transmitting resin layer is formed thereon, The thickness of the light-transmitting resin layer is a predetermined thickness. clock.

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