Timepiece component, timepiece, and method of manufacturing timepiece component

Abstract

To provide a method of efficiently manufacturing a high-quality timepiece component with a blade pattern, which is a symbolic element of a Japanese sword blade.SOLUTION: A timepiece component manufacturing method is provided, comprising a preparation step of preparing a base material having a martensite region and an austenite region formed on iron sand-origin steel, a cutting step of reducing the thickness of the base material by cutting a back surface of the base material, and a cutting-out step of cutting the thinned base material into a shape of a timepiece component through laser processing.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a timepiece component, a timepiece, and a method for manufacturing a timepiece component. [Background technology]

[0002] In addition to the practical use of checking the time, clocks are also favorite items for users. For example, Patent Document 1 discloses a table clock that uses the tsuba (guard) of a Japanese sword as the dial, allowing users to appreciate the tsuba while also displaying the time. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3219219 Summary of the Invention [Problem to be solved by the invention]

[0004] However, because the clock in Patent Document 1 uses the tsuba (guard) of a Japanese sword as the dial face of a table clock, it is difficult to use it in a wristwatch, pocket watch, etc. In other words, there has been a demand for clock parts that use elements of the blade of a Japanese sword and that can be used in wristwatches, etc. [Means for solving the problem]

[0005] A manufacturing method for a watch component according to one embodiment of the present application includes a preparation step of preparing a base material in which martensite regions and austenite regions are formed in tamahagane steel, a cutting step of thinning the base material by cutting from the back surface of the base material, and a cutting step of cutting the thinned base material into the shape of the watch component by laser processing.

[0006] A timepiece component according to one aspect of the present application is made of tamahagane steel, and the timepiece component has a martensite region and an austenite region that is lower in hardness than the martensite region.

[0007] A timepiece according to one embodiment of the present application comprises the above-mentioned dial as a timepiece part, a first band, and a second band that engages with the first band, wherein the first band and the second band both have the martensite region and the austenite region, and the boundary line is arranged so as to connect the first band and the second band. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a front view of the timepiece according to the first embodiment. [Diagram 2] FIG. [Diagram 3] FIG. 4 is a flowchart showing the flow of a base material preparation process. [Figure 4] FIG. 3 is a cross-sectional view taken along line bb in FIG. 2 . [Diagram 5] FIG. 4 is a flowchart showing the flow of a manufacturing process for the dial. [Figure 6] FIG. 1 is a schematic diagram of a laser processing device. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 9 is a cross-sectional view taken along line cc in FIG. 8 . [Figure 10] FIG. 6 is a front view of a timepiece according to a second embodiment. [Figure 11] FIG. 11 is a front view of a timepiece according to a third embodiment. [Figure 12] Rear view of the watch. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] EMBODIMENT 1 ***Clock Overview*** FIG. 1 is a front view of the watch. Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0010] The timepiece 100 of this embodiment is a three-hand analog wristwatch. The timepiece 100 is composed of a case 5, a dial 30, an hour hand 1, a minute hand 2, a second hand 3, a crown 9, a first band 11, a second band 12, etc. The body 5 is the case, and is made of a hard metal such as stainless steel or titanium. A movement (not shown) for driving the hands is housed behind the dial 30 of the body 5. A crown 9 is provided on the 3 o'clock side of the body 5.

[0011] A pair of cans 6 are provided on the 1 o'clock side and the 11 o'clock side of the body 5. A first band 11 is attached to the pair of cans 6. The first band 11 is a metal band made up of a number of metal links connected together. Similarly, a pair of cans 7 are provided on the 5 o'clock side and the 7 o'clock side of the body 5. A second band 12 is attached to the pair of cans 7. The second band 12 is a metal band similar to the first band 11. The dial 30 is provided with hour scale 13, date window 14, etc. The dial 30 may also be provided with a logo, minute scale, etc. A through hole 8 through which the axis of the hands passes is formed in the center of the circular dial 30, and an hour hand 1, minute hand 2, and second hand 3 are attached. In FIG. 1, the watch 100 is a three-hand analog watch equipped with the hour hand 1, minute hand 2, and second hand 3, but the present invention is not limited to this and may be any watch equipped with a dial, such as a digital watch or a smart watch.

[0012] Here, the dial 30 is made of the same tamahagane steel as Japanese swords, and has a blade-like pattern 23 formed during the base material preparation process, which includes the process of applying clay to the blade and the heating and cooling process described below. Tamahagane is steel that is smelted by the ancient tatara ironmaking method, which is the raw material for Japanese swords, and is made up of more than 90% iron, with the remainder being carbon, etc. The pattern 23 is a wavy line segment, and indicates the boundary between the martensite region 21 and the austenite region 22, which has a lower hardness than the martensite region 21. In reality, the pattern 23 resembles a blade pattern due to the difference in color between the whitish martensite region 21 and the blackened austenite region 22 of the base metal, but for convenience of explanation, the boundary between the two will be described as the pattern 23. The same applies to the following explanation. In addition, the pattern 23 is shown as a wavy solid line, but the actual boundary portion includes a portion that changes in a gradational manner. The pattern 23 is not limited to a wavy shape, and may be, for example, a pattern that imitates a straight blade. Even with this pattern, the pattern resembles a blade pattern due to the difference in color between the whitish martensite region 21 and the blackened austenite region 22 of the base metal.

[0013] 1, the pattern 23, which is the boundary between the martensite region 21 and the austenite region 22, is provided connecting approximately 11:30 and approximately 6:30 on the dial 30. In other words, the dial 30 is a timepiece component made of tamahagane steel, and includes the martensite region 21 and the austenite region 22, which has a lower hardness than the martensite region 21. The pattern 23 is provided along the line connecting the 12 o'clock and 6 o'clock positions on the dial 30. In a preferred embodiment, the area ratio of the austenite region 22 to the martensite region 21 is 6:4. However, this ratio is not limited to this, and it is sufficient that the area of ​​the austenite region 22 is larger than the area of ​​the martensite region 21. Furthermore, portions of the dial 30 that require holes to be drilled, such as the through-hole 8 and the date window 14, are preferably located in the austenite region 22 from the standpoint of ease of processing.

[0014] ***Substrate manufacturing method*** Fig. 2 is a plan view of the substrate, Fig. 3 is a flow chart showing the flow of a substrate preparation process, and Fig. 4 is a cross-sectional view taken along line bb in Fig. 2. Prior to describing the manufacturing method of the dial 30, a manufacturing method of the base material 40 in which the martensite region 21 and the austenite region 22 are formed and on which the multiple dials 30 are imposed will be described.

[0015] As shown in FIG. 2, the base material 40 is a plate-like member having a substantially rectangular shape, and two dials 30 are attached to the base material 40 along the direction in which its long sides extend. The diameter of the dial 30 is, for example, about 33 mm. Note that this is not a limiting value, and may be set appropriately depending on the size and design of the watch. The shape of the dial is not limited to a circle, and may be a quadrangle including a tonneau shape, or a polygonal dial. The number of dials attached is not limited to two, and may be more than one, for example, three or four. In other words, the base material 40 is rectangular, and a plurality of dials 30 as timepiece components are imposed on the base material 40.

[0016] In the base material 40, in the extension direction of the short side, the austenite region 22 is formed on the lower side, and the martensite region 21 is formed on the upper side. The area ratio of the austenite region 22 to the martensite region 21 is set to about 6:4. This is because if the area of ​​the first region that becomes the martensite region 21 is too large, a difference in internal stress occurs between the martensite region 21 and the austenite region 22 during cooling in the heating and cooling process described below, causing cracks. Therefore, in order to minimize the loss of the base material 40 and prevent cracks from occurring, it is desirable that the martensite region 21 is smaller than the austenite region 22. The thickness of the base material 40 is, for example, about 0.4 mm. However, this is not a limiting value. The surface 40a of the base material 40 is polished so that the blade pattern 23 can be seen.

[0017] Next, a method for producing such a base material 40 will be described with reference to FIG. In step S11, the raw material, steel, is produced using an ancient iron-making method called tatara iron-making. In step S12, the steel bar is heated, rolled thin, quenched, and cut into small pieces, a so-called water pressing process. In step S13, the small pieces of material are covered with mud and straw ash, heated to near melting, and hammered in what is known as the forging process. The forging process is repeated multiple times. This allows the adjustment of the carbon content, removal of slag, and adjustment of the structure. In step S14, as a finishing step of the forging process, the shape of the material is adjusted to the shape of the base material 40. For example, it is adjusted to a rectangular shape as shown in FIG.

[0018] In step S15, a clay application step is performed in which a temperature control member 42 is applied to the surface 40a of the base material 40. The temperature control member 42 is a clay made by adding pine charcoal, grindstone powder, and the like to fire-resistant clay and kneading it thoroughly. As shown in FIG. 4, in a preferred embodiment, the temperature control member 42 is applied to the entire surface 40a of the base material 40, but is applied thinly to the first region that will become the martensite region 21, and is applied thicker than the first region to the second region that will become the austenite region 22. In more detail, the temperature control member 42 is applied to the first region that will become the martensite region 21 with a thickness t1, and is applied to the second region that will become the austenite region 22 with a thickness t2 that is thicker than the thickness t1. For example, the thickness t1 is about 0.1 mm to 0.2 mm, and the thickness t2 is about 1.0 mm. However, the thicknesses are not limited to these values. In the case of a Japanese sword, the blade clay is applied to both the front and back of the blade, but in the case of the base material 40 that will become the dial, it is sufficient to form a blade pattern on the front surface 40a, so there is no need to apply the temperature adjustment material 42 to the back surface 40b. Also, the temperature adjustment material 42 is necessary in the second region, but the temperature adjustment material 42 is not necessary in the first region. This is because it is considered possible to create the austenite region 22 and the martensite region 21 separately if there is a difference in cooling time between the two regions in the hardening process described below.

[0019] In addition, in a preferred embodiment, the temperature adjustment member 42 is applied manually by a skilled craftsman. This results in the formation of a unique blade pattern 23. It is not limited to manual work, and any method that can apply the temperature adjustment member 42 with different thicknesses between the first and second regions may be used, for example, screen printing. In this case, the temperature adjustment member 42 is applied to the entire surface 40a of the base material 40 by screen printing to a thickness of t1, and then the temperature adjustment member 42 is applied in layers until it reaches a thickness of t2 using a mask with selective openings in the second region. This results in the formation of a blade pattern 23 with a uniform texture. It is not limited to screen printing, and the temperature adjustment member 42 may be applied using a dispenser or inkjet method. These methods allow the blade clay application process to be carried out efficiently.

[0020] In step S16, the base material 40 coated with the temperature control material 42 is heated in a furnace, and then immersed in water for a heating and cooling process to cool rapidly. The heating temperature is preferably 727°C or higher. As a result, the first region, where the temperature control material 42 is thinner, cools faster than the second region, resulting in a martensite structure in which carbon atoms are mixed with iron atoms, forming the martensite region 21. On the other hand, the second region becomes an austenite structure that is lower in hardness than martensite, forming the austenite region 22. The clay application process and the heating and cooling process correspond to a quenching process.

[0021] In step S17, after removing the temperature adjustment member 42, a polishing process is performed in which the surface 40a of the base material 40 is polished while changing the roughness of the grindstone. Specifically, the surface 40a is polished by gradually changing from a grindstone with a small grain size to a grindstone with a large grain size. Note that the polishing is not limited to manual polishing with a grindstone, and any method capable of polishing the surface 40a of the base material 40 may be used, for example, a polisher or a polishing machine such as a lapping machine may be used. This allows the polishing process to be performed efficiently.

[0022] Through the above steps, as shown in FIG. 2, the martensite region 21 and the austenite region 22 are formed, and the base material 40 onto which a plurality of dials 30 can be imposed is prepared. In other words, in the preparation process of the substrate 40, a first region where the temperature adjusting material 42 is thinly applied and a second region where the temperature adjusting material 42 is applied thicker than in the first region are provided on the surface 40a of the substrate 40, and the substrate 40 is heated and then cooled to form the martensite region 21 and the austenite region 22.

[0023] ***How ​​the dial is manufactured*** Fig. 5 is a flow chart showing the flow of the manufacturing process of the dial. Fig. 6 is a schematic diagram of a laser processing device. Fig. 7 is a diagram showing one aspect of the manufacturing process of the dial. Fig. 8 is a diagram showing one aspect of the manufacturing process of the dial. Fig. 9 is a cross-sectional view of the cc section of Fig. 8. Here, the process of manufacturing the dial 30 from the base material 40 formed in the base material preparation process will be described mainly with reference to FIG.

[0024] Step S21 has the same content as the preparation step of the base material 40 described with reference to FIG. In step S22, a protective film is attached to the base material 40. Specifically, as shown in Fig. 7, a protective film 45 is attached to the surface 40a of the base material 40 so as to cover the portion that will become the dial 30. The protective film 45 may be, for example, a transparent polyester film. The protective film 45 may be attached to the entire surface 40a of the base material 40.

[0025] In step S23, the back surface 40b of the substrate 40 is cut to reduce the thickness of the substrate 40. In a preferred embodiment, the back surface 40b of the substrate 40 is cut with a milling machine to make the thickness of the substrate 40 uniform. The thickness of the substrate 40 is set to the same dimension as the design thickness of the dial 30, for example, about 0.4 mm. At this time, the processing is performed with the front surface 40a of the substrate 40 facing down, but the protective film 45 prevents the front surface 40a from being scratched. In other words, the thickness of the dial 30 is constant.

[0026] In step S24, a pair of reference holes 43 are drilled at both ends of the base material 40. As shown in FIG. 7, the pair of reference holes 43 are positioning holes when processing the dial 30, and are provided beside each short side of the base material 40. In a preferred embodiment, the reference holes 43 are drilled at predetermined positions using a drill press. As shown in FIG. 7, the pair of reference holes 43 are located in the austenite region 22, so drilling is easy. After drilling the reference holes 43, the drill press is used to form two mounting holes 34 (FIG. 9) for positioning pins on the back surface 40b of the base material 40. The mounting holes 34 are not through holes, but blind holes dug to about half the thickness of the dial 30.

[0027] Steps S25 to S26 are performed by a laser processing device 90 shown in Fig. 6. First, the configuration of the laser processing device 90 will be described. The laser processing device 90 comprises a laser oscillator 81, a transmission optical system 82, an irradiation unit 83, a processing table 85, a control device 87, and the like. An infrared laser oscillator is used as the laser oscillator 81. In a preferred embodiment, a solid-state laser oscillator compatible with a femtosecond laser is used. However, the present invention is not limited to this, and any infrared laser oscillator may be used, and oscillators such as a gas laser, a semiconductor laser, or a liquid laser may also be used. The transmission optical system 82 is an optical path that transmits the laser light generated by the laser oscillator 81 to the irradiation unit 83, and is configured to include a plurality of reflecting mirrors.

[0028] The irradiation unit 83 is an irradiation nozzle that focuses laser light and irradiates the workpiece, and includes a focusing lens. The processing table 85 is an XY table, and in accordance with instructions from a control device 87, moves a placed object to be processed in a plane in accordance with the scanning path pattern of laser irradiation. The control device 87 is a controller for the laser processing device 90, and is configured to include one or more processors, and controls the operation of each part. The control device 87 is equipped with a storage unit 88 including a non-volatile memory. The storage unit 88 stores a control program for controlling the operation of the laser processing device 90, various data, and the like. The various data stores irradiation conditions for each processing portion and scanning path pattern data. The irradiation conditions include parameters such as output frequency, scanning speed, laser output, and scanning path pitch.

[0029] In step S25, as shown in FIG. 7, a through hole 8 through which a hand shaft is inserted is formed at the center position of the dial 30. Specifically, as shown in FIG. 6, the base material 40 is set on the processing table 85 of the laser processing device 90, and the through hole 8 is formed by femtosecond laser irradiation. The processing table 85 is provided with a pair of positioning pins (not shown) corresponding to the pair of reference holes 43 of the base material 40, and the base material 40 is fixed in a positional state by the pair of positioning pins. Since the femtosecond laser has a small pulse width and can complete the laser irradiation faster than the heat is transmitted to the base material 40, it is possible to prevent cracks on the surface 40a of the base material 40 due to the influence of heat, and to form a clean through hole 8. After the through hole 8 is formed, the date window 14 is also formed by femtosecond laser irradiation. FIG. 7 shows this state. As shown in FIG. 7, both the through hole 8 and the date window 14 are located in the austenite region 22, so that perforation is easy.

[0030] In step S26, the dial 30 is cut out from the base material 40. The cutting out is performed by irradiating the femtosecond laser multiple times along the circular shape of the dial 30 shown by the dotted line in FIG. 7. At this time, the irradiation conditions of the laser irradiation are changed between the martensite region 21 and the austenite region 22. In detail, the irradiation conditions when processing the martensite region 21 are set to a higher amount of irradiation energy than when processing the austenite region 22. In other words, the output when processing the martensite region 21, which has a high hardness, is set to a higher output than when processing the austenite region 22. FIG. 8 is a plan view of the cut out single dial 30, and the area ratio of the austenite region 22 to the martensite region 21 is 6:4. In other words, in the cutout process, the cutout is performed so that the area of ​​the martensite region 21 is smaller than the area of ​​the austenite region 22.

[0031] In other words, the manufacturing method of the dial 30 as a watch component includes a preparation step of preparing the base material 40 in which the martensite region 21 and the austenite region 22 are formed in tamahagane steel, a cutting step of thinning the thickness of the base material 40 by cutting from the back surface 40b of the base material 40, and a cutout step of cutting the thinned base material 40 into the shape of the dial 30 as a watch component by laser processing. In the cutout step, the output of the laser processing is changed between the martensite region 21 and the austenite region 22, and the output when processing the martensite region 21 is made higher than the output when processing the austenite region 22. In the perforation step and the cutout step, each step is performed by fixing a pair of reference holes 43 provided in the peripheral portion of the base material 40 excluding the portion that will become the dial 30 as a watch component.

[0032] In step S27, as shown in Fig. 9, positioning pins 35 are fitted into a pair of mounting holes 34 on the back surface 30b of the dial 30 formed in step S24. As shown in Fig. 8, the positioning pins 35 are attached to the 1 o'clock side and the 5 o'clock side of the dial 30 in the austenite region 22. After attachment, the fitting portions of the positioning pins 35 may be reinforced with adhesive or brazing. The positioning pins 35 are positioning pins for the dial 30, and the movement (not shown) on which the dial 30 is mounted has a pair of alignment holes at positions corresponding to the pair of positioning pins 35.

[0033] In step S28, the surface 30a of the dial 30 is coated with a protective film 36. For example, the protective film 36 is a polysilazane coating to prevent rust on the surface 30a. However, this is not limited to this, and for example, a DLC (Diamond-Like Carbon) coating or an ALD (Atomic Layer Deposition) coating may also be applied. By applying these coatings, it is possible to obtain an anti-rust effect without damaging the pattern 23 on the surface 30a. In step S29, the hour scale 13 is attached to the surface 30a of the dial 30. In a preferred embodiment, the hour scale 13 is attached to the surface 30a with double-sided tape or adhesive. When using a typeset type hour scale, attachment holes are formed in the surface 30a of the dial 30 by irradiating it with a femtosecond laser, and then the hour scale is attached.

[0034] As described above, the manufacturing method for the dial 30 as a timepiece component, the dial 30, and the timepiece 100 of this embodiment provide the following advantages. The manufacturing method for dial 30 as a watch component includes a preparation step of preparing substrate 40 in which martensite region 21 and austenite region 22 are formed in tamahagane steel, a cutting step of thinning substrate 40 by cutting from rear surface 40b of substrate 40, and a cutting step of cutting thin substrate 40 into the shape of dial 30 as a watch component by laser processing.

[0035] Because Tamahagane is very hard, there were issues with using a milling machine for the cutting process, such as scratches on the surface and jagged edges. By using a laser for the cutting process, no scratches are generated and the edges can be finished neatly. On the other hand, the cutting process of the back surface 40b of the base material 40, which is not an exterior portion, can be performed by cutting and thinning using a milling machine, for example, which allows a wider area to be processed more efficiently in a shorter time than by laser processing. The martensite region 21 in the completed dial 30 exhibits a pattern 23 that corresponds to the blade pattern of a Japanese sword. Therefore, it is possible to provide a method for efficiently producing a high-quality timepiece dial 30 that can be used for wristwatches and has the blade pattern, which is a symbolic element of the blade of a Japanese sword.

[0036] In addition, in the preparation process of the substrate 40, a first region where the temperature adjustment material 42 is thinly applied and a second region where the temperature adjustment material 42 is applied thicker than in the first region are provided on the surface 40a of the substrate 40, and the substrate 40 is heated and then cooled to form the martensite region 21 and the austenite region 22. According to this, a martensite region 21 and an austenite region 22 are formed on the surface 40a of the base material 40, so that it is possible to cut out a dial 30 as a timepiece part having a pattern 23 resembling the blade pattern of a Japanese sword.

[0037] In the cut-out process, the irradiation conditions for laser processing are changed between the martensite region 21 and the austenite region 22, and the irradiation condition for processing the martensite region 21 is set to a larger amount of irradiation energy than that for processing the austenite region 22. In order to increase the amount of irradiation energy, for example, condition changes such as increasing the laser output or lengthening the pulse width can be selected. According to this, the laser irradiation conditions are changed according to the hardness, so that the cutting process can be carried out efficiently.

[0038] The base material 40 is rectangular, and a plurality of dials 30 as timepiece components are attached to the base material 40. This allows the dial 30 to be cut out efficiently from the base material 40, so that the base material 40 made of valuable steel can be used without waste.

[0039] Moreover, after the step of preparing the substrate 40, the method further includes a step of forming a protective film 45 as a protective film on the surface 40a of the substrate 40. This can prevent the surface 40a of the base material 40 from being scratched in the next cutting step and in subsequent steps.

[0040] In the cut-out process, the cut-out is performed so that the area of ​​the martensite region 21 is smaller than the area of ​​the austenite region 22. According to this, cracks are not generated in the base material 40, and loss of the base material 40 can be minimized.

[0041] Moreover, the timepiece component is a dial 30, and after the cutting step, the method further includes a drilling step of forming a through hole 8 through which a hand stem is inserted in the austenitic region 22 of the dial 30 by laser processing. According to this, since the through holes 8 are located in the austenite region 22, the through holes 8 can be easily drilled in the drilling step.

[0042] In the punching and cutting steps, a pair of reference holes 43 provided in the peripheral portion of the base material 40 excluding the portion that will become the dial 30 as a timepiece component is fixed, and each step is performed. According to this, since a pair of reference holes 43 is provided in the peripheral portion of the base material 40 for positioning and fixing, the base material 40 made of valuable steel can be used without waste.

[0043] The dial 30 is a timepiece part made of tamahagane steel, and includes a martensite region 21 and an austenite region 22 that is lower in hardness than the martensite region 21. According to this, the dial 30 has a martensite region 21 exhibiting a pattern 23 that corresponds to the blade pattern of a Japanese sword. Therefore, it is possible to provide a watch part that can be used for a wristwatch and has the blade pattern that is a symbolic element of the blade of a Japanese sword.

[0044] Moreover, the timepiece part is the dial 30, and the thickness of the dial 30 is constant. Because a Japanese sword is a blade, its thickness decreases from the edge of the blade to the tip, but the thickness of a watch part can be constant, and with this structure, the blade pattern 23 can be used as a design.

[0045] The dial 30 also has a through hole 8 through which the stem is inserted, and the through hole 8 is provided in the austenite region 22. According to this, the through holes 8 are located in the austenite region 22, so that the drilling is easy.

[0046] Moreover, the area ratio of the austenite region 22 to the martensite region 21 is 6: 4. This prevents cracks from occurring in the base material 40, and allows loss of the base material 40 to be minimized.

[0047] The boundary between the martensite region 21 and the austenite region 22 is provided along a line connecting 12 o'clock and 6 o'clock on the dial 30. In a preferred embodiment, the boundary is provided by connecting approximately 11:30 and approximately 6:30 on the dial 30. This allows a half-moon pattern 23 to be obtained on the left side of the dial 30.

[0048] The timepiece 100 also includes a dial 30 . It is therefore possible to provide a timepiece 100 equipped with a dial 30 as a timepiece component that has the blade pattern, which is a symbolic element of the blade of a Japanese sword. In other words, it is possible to provide a dial 30 and a timepiece 100 that have elements of an authentic Japanese sword.

[0049] EMBODIMENT 2 ***Different Forms-1*** FIG. 10 is a front view of a timepiece according to embodiment 2 and corresponds to FIG. In the above embodiment, the blade pattern 23 is provided on the dial 30 of the timepiece 100, but this is not limited to this, and for example, the band may also have a blade pattern. In the following, the same parts as in the above embodiment are given the same numbers, and duplicate explanations will be omitted.

[0050] As shown in FIG. 10, the timepiece 110 of this embodiment is equipped with the dial 30 described above, as well as a first band 51 and a second band 52 having a blade pattern 24. The first band 51 is composed of multiple links 17 made of tamahagane steel. Like the dial 30, the links 17 are timepiece components cut out from a base material made of tamahagane steel, and as shown in FIG. 10, they have a martensite region 21 and an austenite region 22, with a blade-like pattern 24 along the boundary between them. The size of the base material is a long and narrow rectangle that matches the width of the links 17, but the preparation process, including the hardening process, is the same as that explained in FIG. 3. The process of cutting the links 17 out of the base material is substantially the same as that explained in FIG. 5, except for the cut shape.

[0051] As shown in FIG. 10 , the blade pattern 24 on the first band 51 is disposed so as to be connected to the upper side of the pattern 23 on the dial 30 . Similarly, the second band 52 is also composed of a plurality of pieces 17 made of tamahagane steel. The pieces 17 are the same as the pieces 17 of the first band 51, and are provided with a blade pattern 24. As shown in FIG. 10 , the blade pattern 24 on the second band 52 is disposed so as to be connected to the underside of the pattern 23 on the dial 30 . In other words, the watch 110 comprises a dial 30, a first band 51, and a second band 52 that engages with the first band 51, the first band 51 and the second band 52 both having martensite regions 21 and austenite regions 22, and the boundary pattern 24 is arranged so as to connect to the first band 51 and the second band 52 via the pattern 23 on the dial 30.

[0052] As described above, the timepiece 110 of this embodiment has the following advantages in addition to those of the above embodiment. The watch 110 comprises a dial 30, a first band 51, and a second band 52 that engages with the first band 51, the first band 51 and the second band 52 both having martensite regions 21 and austenite regions 22, and a boundary pattern 24 is arranged so as to connect to the first band 51 and the second band 52 via a pattern 23 on the dial 30.

[0053] According to this, along the line segment connecting 11:30 to 6:30 on the timepiece 110, a single blade pattern 24, 23, 24 is formed connecting the first band 51, the dial 30, and the second band 52. It is therefore possible to provide a watch 110 having the blade pattern, which is a symbolic element of the blade of a Japanese sword.

[0054] EMBODIMENT 3 ***Different Forms-2*** Fig. 11 is a front view of a timepiece according to embodiment 3 and corresponds to Fig. 1. Fig. 12 is a front view of the timepiece. In the above embodiment, the blade pattern 23 is described as a wave pattern along a straight line, but it is not limited to this and may be, for example, a pattern along an arc or a curve. In the following, the same parts as in the above embodiment are given the same numbers and duplicated explanations will be omitted.

[0055] The timepiece 120 of this embodiment shown in FIG. 11 has a dial 38 on the front side and an oscillating weight 80 (FIG. 12) on the back side, and is an analog mechanical timepiece that displays the time by winding the mainspring with the rotation of the oscillating weight 80. The dial 38 is provided with a power reserve display 49, a mark 47, a logo 48, a pattern 25, etc. The power reserve display 49 is an indicator that shows the remaining operating time until the timekeeping stops when the watch 120 is left alone. In Fig. 11, a fan-shaped power reserve display is provided on the dial 38 from 11 o'clock to 1 o'clock. Mark 47 is, for example, a mark designed in the shape of the alphabet S, and is provided on the 3 o'clock side. Logo 48 is a product logo that pairs with mark 47, and is provided below mark 47. Note that the positions of mark 47 and logo 48 are not limited to these positions.

[0056] Dial 38 has a crescent-shaped blade pattern 25 on the 9 o'clock side. Dial 38 is manufactured using the same process as dial 30, and has a martensite region 21 and an austenite region 22, with pattern 25 formed at the boundary between them. The difference in the patterns can be adjusted by the way in which temperature adjustment material 42 is applied in the blade clay application process. The pattern 25 is provided in a crescent shape along a circular arc on the outer periphery of the dial 38 in the range from 6 o'clock to 12 o'clock. Note that the pattern is not limited to a circular arc, and may be provided along a curved line.

[0057] 12, the back of the watch 120 has a skeleton structure, and a transparent back cover 56 is attached to the case 5. Through the back cover 56, the oscillating weight 80 can be observed. Rotating weight 80 is composed of a semicircular main body 75 and weight portion 76 attached along the outer periphery of main body 75. Weight portion 76 is a strip-shaped member that follows the arc, and is fixed to main body 75 with three fixing pins 77 and is integrated with main body 75. Weight portion 76 has a crescent-shaped blade pattern 26 on the 3 o'clock side. Weight portion 76 is manufactured by the same process as dial 30, and has martensite region 21 and austenite region 22, with pattern 26 formed at the boundary between them. Pattern 26 is provided between the circular arc on the inner periphery side of weight portion 76 and the circular arc on the outer periphery side.

[0058] The watch parts on which the blade pattern can be formed are not limited to the dial, band, or oscillating weight, but can be any watch part on which a pattern can be formed, such as the case, back cover, receiving plate, or bezel.

[0059] As described above, the timepiece 120 of this embodiment has the following advantages in addition to those of the above embodiment. The watch 120 has a dial 38 with a crescent-shaped pattern 25, and an oscillating weight 80 with a crescent-shaped pattern 26. In other words, crescent-shaped blade-like patterns 25, 26 are provided on the front and back surfaces of the watch 120. Furthermore, blade-like patterns can also be applied to multi-axis, multi-function watches such as the watch 120. It is therefore possible to provide a watch 120 having the blade pattern, which is a symbolic element of the blade of a Japanese sword. [Explanation of symbols]

[0060] 1...hour hand, 2...minute hand, 3...second hand, 5...body, 8...through hole, 9...crown, 11...first band, 12...second band, 13...hour scale, 14...date window, 17...link, 21...martensite area, 22...austenite area, 23...pattern, 24...pattern, 25...pattern, 26...pattern, 30...dial, 30a...surface, 30b...back, 34...mounting hole, 35...positioning pin, 36...protective film, 38...dial, 40...base material, 40a...surface, 4 0b...back side, 42...temperature adjustment member, 43...reference hole, 45...protective film, 47...mark, 48...logo, 49...power reserve indicator, 51...first band, 52...second band, 75...main body, 76...weight portion, 77...fixing pin, 80...oscillating weight, 81...laser oscillator, 82...transmission optical system, 83...irradiation unit, 85...processing table, 87...control device, 88...memory unit, 90...laser processing device, 100,110,120...clock.

Claims

1. a preparation step of preparing a base material in which a martensite region and an austenite region are formed in tamahagane; a cutting step of thinning the thickness of the base material by cutting from the back surface of the base material; a cutting process in which the thinned substrate is cut into the shape of a watch part by laser processing; A method for manufacturing a watch part, comprising:

2. In the preparation step, a first region in which a temperature regulating member is thinly applied on a surface of the base material, and a second region in which the temperature regulating member is applied thicker than the first region; The base material is heated and then cooled to form the martensite region and the austenite region. The method for manufacturing a watch component according to claim 1.

3. In the cutting step, The irradiation conditions of the laser processing are changed between the martensite region and the austenite region, The irradiation condition when processing the martensite region is that the amount of irradiation energy is greater than that when processing the austenite region. The method for manufacturing a watch component according to claim 1 or 2.

4. the substrate is rectangular; A plurality of the watch components are surface-mounted on the base material. The method for manufacturing a watch component according to claim 1 or 2.

5. After the preparation step, Further comprising a step of forming a protective film on the surface of the substrate. The method for manufacturing a watch component according to claim 4.

6. In the cutting step, The cutout is performed so that the area of ​​the martensite region is smaller than the area of ​​the austenite region. The method for manufacturing a watch component according to claim 4.

7. the timepiece component is a dial, The method further includes, after the cutting step, a drilling step of forming a through hole, through which a stem is inserted, in the austenite region of the dial by the laser processing. The method for manufacturing a watch component according to claim 1 or 2.

8. In the punching step and the cutting step, The peripheral portion of the base material excluding the portion that will become the watch component is fixed, and each step is carried out. The method for manufacturing a watch component according to claim 7.

9. A watch part made of tamahagane steel, The timepiece component comprises a martensite region and an austenite region having a lower hardness than the martensite region. Watch parts.

10. the timepiece component is a dial, The thickness of the dial is constant.

10. The watch component according to claim 9.

11. the dial has a through hole through which a pointer stem is inserted, The through-hole is provided in the austenite region. The timepiece component according to claim 10.

12. The area of ​​the austenite region is larger than the area of ​​the martensite region. A watch component according to claim 11.

13. The area ratio of the austenite region to the martensite region is 6:

4.

13. A watch component according to claim 12.

14. The boundary between the martensite region and the austenite region is It is provided along the line connecting 12 o'clock and 6 o'clock on the dial. A watch component according to claim 11.

15. A dial according to claim 10 or 11. clock.

16. a first band and a second band that engages with the first band, the first band and the second band both have the martensite region and the austenite region; a boundary line between the martensite region and the austenite region is arranged so as to connect to the first band and the second band; 16. The watch of claim 15.

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