Timepiece component and method for manufacturing timepiece component

Abstract

The invention provides a timepiece component and a method for manufacturing the timepiece component. Pear-skin-shaped patterns which are not apt to be conspicuous even if the timepiece component is grasped by tweezers or the like are processed. A timepiece component on which a pear-skin-like pattern is formed, the average value of the average length RSm of a roughness curve of the surface of the pear-skin-like pattern being 40 [mu] m or more and 135 [mu] m or less, and the average value of the skewness Rsk of the roughness curve being-3.1 or more and 0 or less.

Description

TECHNICAL FIELD

[0001] The present application relates to a timepiece component and a manufacturing method of a timepiece component. BACKGROUND

[0002] As a method of forming a pear skin pattern on various timepiece components such as a dial, a case, a back cover, a bottom plate, and the like, a sandblasting process described in Patent Literature 1 is known.

[0003] Patent Literature 1: Japanese Patent Application Laid-Open No. 9-38864

[0004] However, when a timepiece component on which a pear skin pattern is processed by the sandblasting process is held by tweezers at the time of assembling a timepiece or the like, the convex portion is sometimes flattened and easily noticeable as a defect. Therefore, a timepiece component on which a pear skin pattern that is not easily noticeable even when held by tweezers or the like is processed and a manufacturing method of a timepiece component are sought. SUMMARY

[0005] The timepiece component of the present application is a timepiece component on which a pear skin pattern is formed, characterized in that an average value of an average length RSm of a roughness curve of a surface of the pear skin pattern is 40 μm or more and 135 μm or less, and an average value of a skewness Rsk of the roughness curve is -3.1 or more and 0 or less.

[0006] The manufacturing method of a timepiece component of the present disclosure is a manufacturing method of a timepiece component on which a pear skin pattern is formed by irradiating a laser to a base material in a processing region of the base material, characterized in that the manufacturing method of a timepiece component is processed in such a manner that an average value of an average length RSm of a roughness curve of a surface of the pear skin pattern is 40 μm or more and 135 μm or less, and an average value of a skewness Rsk of the roughness curve is -3.1 or more and 0 or less. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 is a front view of a timepiece illustrating an embodiment.

[0008] Figure 2 is a schematic cross-sectional view of a laser irradiation apparatus illustrating an embodiment.

[0009] Figure 3 is a schematic plan view of a scanning direction of a pulse laser and a processing trace illustrating an embodiment.

[0010] Figure 4A is a view of a processing region illustrating an example.

[0011] Figure 4B is a view of a processing region illustrating a comparative example.

[0012] Figure 5Ais a graph showing measured values of each parameter of surface roughness of the example.

[0013] Figure 5B is a graph showing measured values of each parameter of surface roughness of the comparative example.

[0014] Figure 6A is a graph showing an example of a roughness curve of the example.

[0015] Figure 6B is a graph showing an example of a roughness curve of the comparative example.

[0016] Explanation of Reference Signs

[0017] 1: timepiece; 10: dial; 10A: base material; 20: laser irradiation device; 24: pulsed laser; 26: control device; 30: processing region; 31: processing mark. DETAILED DESCRIPTION

[0018] Hereinafter, a timepiece 1 of an embodiment of the present disclosure will be described with reference to the drawings.

[0019] Figure 1 is a front view showing the timepiece 1. In the present embodiment, the timepiece 1 is configured as a wristwatch to be worn on a wrist of a user.

[0020] As shown in Figure 1 , the timepiece 1 has a metal outer case 2. Inside the outer case 2, there are provided a circular plate-shaped dial 10, a second hand 3, a minute hand 4, a hour hand 5, a stem 7, an A button 8, and a B button 9. On the dial 10, there is provided an hour marker 6 for indicating a time. Further, on the back surface side of the dial 10, there is a movement or the like, which is not shown.

[0021] On the front surface of the dial 10 of the timepiece 1, a pear skin-like pattern is formed by laser processing, similarly to sandblasting processing.

[0022] Reference will be made to Figure 2 and Figure 3 to describe a laser processing method for the dial 10. In addition, the base material 10A constituting the dial 10 is made of a metal material such as brass, titanium, stainless steel, pure iron, white brass, duralumin, steel, and an alloy containing at least one of these metals. In addition, the material of the base material 10A is not limited thereto, and can be any material that is used for a component of a timepiece and that can be processed by laser.

[0023] As shown in Figure 2 , a laser irradiation device 20 that irradiates pulsed laser light to the base material 10A of the dial 10 has a laser irradiation portion 21, a movement mechanism, which is not shown, and a control device 26.

[0024] The laser irradiation unit 21 includes a laser emission unit 22 and a focusing optical system 23. The laser emission unit 22 irradiates a nanosecond laser with a pulse width on the order of nanoseconds as a pulsed laser 24.

[0025] The focusing optical system 23 focuses the pulsed laser 24 onto the focusing section 24A. At the focusing section 24A, the pulsed laser 24 has high energy, thus removing metal particles from the surface of the substrate 10A. When the substrate 10A is irradiated with a single pulsed laser 24, the same effect occurs. Figure 3 As shown, a recess, namely a processing mark 31, is formed in the processing area 30 on the surface of the substrate 10A, which is controlled by the focusing optical system 23.

[0026] In this embodiment, the laser irradiation unit 21 is configured to irradiate a pulsed laser 24 with a frequency f = 160 kHz and a spot diameter R = 30 μm.

[0027] The moving mechanism is, for example, a mechanism that moves the worktable on which the substrate 10A is to be processed in the X-axis and Y-axis directions; it is acceptable as long as it can move the pulsed laser 24 irradiating the substrate 10A from the laser irradiation unit 21 relative to it in the scanning direction. Figure 3 As shown, the moving mechanism of this embodiment repeatedly performs the following actions: after the laser irradiation unit 21 moves relative to the substrate 10A in the X1 direction, it moves a predetermined distance P in the Y1 direction, and then moves in the X2 direction and moves the distance P in the Y1 direction.

[0028] In this embodiment, the control device 26 controls the moving mechanism to move the laser irradiation unit 21 relative to the substrate 10A in the X1 and X2 directions at a scanning speed V of 1500 mm / s. The interval in the Y1 direction, i.e., the spacing P, is set to be in the range of 0.3 to 1.15 times the spot diameter R. When the spacing P is set to less than 0.3 times the spot diameter R, the overlapping area of ​​adjacent processing marks 31 increases, and the processing efficiency decreases. When the spacing P is greater than 1.15 times the spot diameter R, the unprocessed area increases, and the aesthetics of the watch component decrease. Therefore, the spacing P is preferably set to be in the range of 0.3 to 1.15 times the spot diameter R. Furthermore, the spacing P is more preferably set to be in the range of 0.3 to 1 times the spot diameter R.

[0029] In the case where a machining mark 31 with a spot diameter R is continuously formed using a pulsed laser 24, such as Figure 3 As shown, the length α of the scanning direction of the overlapping portion of each machining mark 31 is α = RV / f. Here, V / f is the distance that the pulsed laser 24 advances in one cycle when continuously irradiated with a pulsed laser 24 of frequency f, that is, the distance moved from the irradiation position of the pulsed laser 24 to the irradiation position of the next pulsed laser 24.

[0030] In the present embodiment, a part of the processing marks 31 that are continuous in the scanning direction is set to overlap, i.e., 0 < α < R. In the present embodiment, R = 30 μm, V = 1500 mm / s = 1500000 μm / s, f = 160 kHz = 160000 Hz, and thus α = 30 - 9.375 = 20.625 μm. In addition, the state in which the processing marks 31 contact each other is also included in the expression in which a part of the processing marks 31 overlap, and 0 = α indicates this state. That is, a part of the processing marks 31 overlapping means that the processing marks 31 are connected without a gap.

[0031] The control device 26 alternately sets the irradiation on time Ton and the irradiation off time Toff of the pulsed laser 24, and controls each of the irradiation on time Ton and the irradiation off time Toff to be a random time. Thereby, the processing marks 31 based on laser processing are irregularly formed on the surface of the base material 10A, and rough surface processing like sandblasting processing is performed. In the present embodiment, since the frequency f of the pulsed laser 24 is 160 kHz, the period T of the pulsed laser 24 is 6.25 μm. The control device 26 is set to the irradiation on time Ton = T x Ron and the irradiation off time Toff = T x Roff. Here, Ron and Roff are random integers, and Ron is a random integer in the range of 0 to 8 and Roff is a random integer in the range of 0 to 6 in the present embodiment. In addition, random means that there is no regularity, and it is random and irregular.

[0032] During movement of the laser irradiation section 21 in the X1 direction and the X2 direction, the control device 26 randomly sets the irradiation on time Ton and the irradiation off time Toff, and controls the irradiation of the pulsed laser 24. In addition, during movement of the laser irradiation section 21 in the Y1 direction, the control device 26 controls the irradiation of the pulsed laser 24 to be off. Thereby, the processing marks 31 generated by the irradiation of the pulsed laser 24 are continuously formed in various lengths in the X1 direction and the X2 direction that are the scanning directions, and the length of the non-processing portion is also randomly set, and thus it is possible to form random processing marks 31 like sandblasting processing.

[0033] In addition, in Figure 2 and Figure 3 , the laser irradiation section 21 is relatively moved in the X1 direction and the X2 direction with respect to the base material 10A to perform laser processing, but in the present embodiment, laser processing based on movement in the Y1 direction and the Y2 direction and laser processing based on movement in a direction that is 45 degrees with respect to the X direction and the Y direction are also performed. That is, in the present embodiment, the base material 10A is scanned with the pulsed laser 24 from a plurality of directions to process the pear skin pattern.

[0034] The control device 26 controls the pulsed laser 24 and the moving mechanism in accordance with the machining pattern data set in advance, thereby machining the prescribed pear skin pattern in the machining region 30. Thus, the laser machining of the laser irradiation device 20 can always machine the same pear skin pattern by using the same machining pattern data.

[0035] Next, the embodiment in which the pear skin pattern is formed by laser machining will be described in comparison with the comparative example in which the pear skin pattern is formed by sandblasting.

[0036] Figure 4A is a view showing the pear skin pattern of the embodiment formed by laser machining. Figure 4B is a view showing the pear skin pattern based on sandblasting. As Figure 4A and Figure 4B shown, 10 reference lines each having a reference length of 250 μm are set in a region having a prescribed size of, for example, 500 μm x 700 μm, and the surface roughness is measured along each reference line using a surface roughness measuring machine.

[0037] Figure 5A is a view showing the measured values of each parameter of the surface roughness of the embodiment. Figure 5B is a view showing the measured values of each parameter of the surface roughness of the comparative example. In addition, the surface roughness measuring machine has a contact type using a stylus and a non-contact type using laser light or the like, and in the present embodiment, the surface roughness measuring machine of the non-contact type is used for measurement.

[0038] In addition, Figure 6A is a roughness curve of the embodiment measured by the surface roughness measuring machine along one of the 10 reference lines of Figure 4A . Figure 6B is a roughness curve of the comparative example measured by the surface roughness measuring machine along one of the 10 reference lines of Figure 4B .

[0039] As Figure 5A shown, in the embodiment, the average value of the average length RSm of the roughness curve is 94.03 μm, which is included in the range of 40 μm or more and 135 μm or less. On the other hand, as Figure 5B shown, in the comparative example, the average value of the average length RSm of the roughness curve is 34.83 μm, which is outside the range of 40 μm or more and 135 μm or less. Thus, as Figure 6A shown, the interval of the concave-convex portions in the roughness curve of the embodiment is larger than that of the comparative example shown in Figure 6B .

[0040] In addition, the average of the average length RSm being within the prescribed range means that even if the average length RSm of a part of the roughness curves is outside the range, as long as the average of the average lengths RSm of a plurality of roughness curves is within the range. The same applies to other parameters.

[0041] As shown in FIG. 6, in the example, the average of the skewness Rsk was -0.43, which was within the range of -3.1 or more and 0 or less. As shown in FIG. 7, in the comparative example, the average of the skewness Rsk was -0.02, which was within the range of -3.1 or more and 0 or less. In addition, the average of the skewness Rsk of the comparative example was closer to 0 than that of the example. Thus, the concavities and convexities of the surface of the comparative example were approximately equal with respect to the average line, whereas the example had a tendency for the concavities and convexities of the surface to be biased toward the upper side with respect to the average line as compared with the comparative example. Figure 5A Figure 5B As shown in FIG. 6, in the example, the average of the skewness Rsk was -0.43, which was within the range of -3.1 or more and 0 or less. As shown in FIG. 7, in the comparative example, the average of the skewness Rsk was -0.02, which was within the range of -3.1 or more and 0 or less. In addition, the average of the skewness Rsk of the comparative example was closer to 0 than that of the example. Thus, the concavities and convexities of the surface of the comparative example were approximately equal with respect to the average line, whereas the example had a tendency for the concavities and convexities of the surface to be biased toward the upper side with respect to the average line as compared with the comparative example.

[0042] As shown in FIG. 6, in the example, the average of the skewness Rsk was -0.43, which was within the range of -3.1 or more and 0 or less. As shown in FIG. 7, in the comparative example, the average of the skewness Rsk was -0.02, which was within the range of -3.1 or more and 0 or less. In addition, the average of the skewness Rsk of the comparative example was closer to 0 than that of the example. Thus, the concavities and convexities of the surface of the comparative example were approximately equal with respect to the average line, whereas the example had a tendency for the concavities and convexities of the surface to be biased toward the upper side with respect to the average line as compared with the comparative example. Figure 5A Figure 5B As shown in FIG. 6, in the example, the average of the skewness Rsk was -0.43, which was within the range of -3.1 or more and 0 or less. As shown in FIG. 7, in the comparative example, the average of the skewness Rsk was -0.02, which was within the range of -3.1 or more and 0 or less. In addition, the average of the skewness Rsk of the comparative example was closer to 0 than that of the example. Thus, the concavities and convexities of the surface of the comparative example were approximately equal with respect to the average line, whereas the example had a tendency for the concavities and convexities of the surface to be biased toward the upper side with respect to the average line as compared with the comparative example.

[0043] As shown in FIG. 6, in the example, the average of the skewness Rsk was -0.43, which was within the range of -3.1 or more and 0 or less. As shown in FIG. 7, in the comparative example, the average of the skewness Rsk was -0.02, which was within the range of -3.1 or more and 0 or less. In addition, the average of the skewness Rsk of the comparative example was closer to 0 than that of the example. Thus, the concavities and convexities of the surface of the comparative example were approximately equal with respect to the average line, whereas the example had a tendency for the concavities and convexities of the surface to be biased toward the upper side with respect to the average line as compared with the comparative example. Figure 5A Figure 5B As shown in FIG. 6, in the example, the average of the skewness Rsk was -0.43, which was within the range of -3.1 or more and 0 or less. As shown in FIG. 7, in the comparative example, the average of the skewness Rsk was -0.02, which was within the range of -3.1 or more and 0 or less. In addition, the average of the skewness Rsk of the comparative example was closer to 0 than that of the example. Thus, the concavities and convexities of the surface of the comparative example were approximately equal with respect to the average line, whereas the example had a tendency for the concavities and convexities of the surface to be biased toward the upper side with respect to the average line as compared with the comparative example.

[0044] Thus, as shown in FIG. 6 and FIG. 7, the example had a tendency for the concavities and convexities of the surface to be biased toward the upper side with respect to the average line as compared with the comparative example. Figure 6A Figure 6B Thus, as shown in FIG. 6 and FIG. 7, the example had a tendency for the concavities and convexities of the surface to be biased toward the upper side with respect to the average line as compared with the comparative example.

[0045] According to such the present embodiment, by forming the pear skin pattern by laser processing, the average of the average length RSm of the roughness curve of the surface is 40 μm or more and 135 μm or less, and the average of the skewness Rsk is -3.1 or more and 0 or less, and thus, it is possible to make the damage when the timepiece component on which the pear skin pattern is formed is held by tweezers or the like less conspicuous.

[0046] ​​​​That is, in a case where the dial 10 is held by tweezers or the like, a prescribed load is applied to the skin surface formed with the pear skin pattern, and the convex portions are flattened. Therefore, in a case where the interval of the concave-convex of the pear skin pattern, that is, the average length RSm is small, and the skewness Rsk is positive in which the concave-convex is skewed to the lower side with respect to the average line, and the convex portions become sharp, when the timepiece component is held by the tweezers, the plurality of convex portions are easily flattened, the flattened convex portions are connected and appear in a linear shape, and thus the damage is easily noticeable. In addition, if the average value of the average length RSm is greater than 135 μm, the interval of the concave-convex of the pear skin pattern becomes too large, and the similarity to the pear skin pattern decreases, and if the skewness Rsk is less than -3.1, the convex portions of the pear skin pattern become flat, and the area thereof also greatly increases compared to the concave portions, and thus the similarity to the pear skin pattern decreases.

[0047] Therefore, by forming the concave-convex in the processing region 30 of the base material 10A by laser irradiation, the average length RSm of the roughness curve of the surface of the processing region 30 is made to be 40 μm or more and 135 μm or less, and the skewness Rsk is made to be -3.1 or more and 0 or less, and thus the pear skin pattern can be expressed, and when held by tweezers, the convex portions are not easily flattened, and thus the damage is not easily noticeable, and the appearance of the dial 10 as a timepiece component can be inhibited from decreasing.

[0048] The laser irradiation device 20 can reproduce the same pear skin pattern by using the registered processing pattern, and thus can produce the dial 10 with stable quality. Therefore, the watch 1 with the dial 10 having a pear skin appearance with controlled glossiness can be manufactured, and the product value of the watch 1 can be improved.

[0049] [Modified Example]

[0050] The scanning direction of the pulsed laser 24 is not limited to the above-described embodiment. That is, the scanning direction of the pulsed laser 24 can be one direction, or two directions, or three or more directions. For example, if it is a dial, the pulsed laser 24 can be scanned along a first direction connecting 12 o'clock and 6 o'clock, a second direction connecting 2 o'clock and 8 o'clock, and a third direction connecting 4 o'clock and 10 o'clock to process the pear skin pattern.

[0051] The processing conditions of the laser irradiation device 20, the output level of the pulsed laser 24, the scanning speed V, the frequency f, the irradiation on time Ton, the irradiation off time Toff, and the like can be appropriately set according to the type, material, and the like of the timepiece component as a processing target.

[0052] The watch component processed by the laser is not limited to the dial 10, but can also be a case, a back cover, a bottom plate, a balance, a second bridge, a train bridge, a balance spring mechanism bridge, a backside object presser, and the like. In addition, the processing area can be the entire surface of the watch component, or a part thereof, and the scanning path is set according to the processing area, design, and the like.

[0053] [Summary of the Disclosure]

[0054] The watch component of the present application is characterized in that it is a watch component formed with a pear skin pattern, an average value of an average length RSm of a roughness curve of a surface of the pear skin pattern is 40 μm or more and 135 μm or less, and an average value of a skewness Rsk of the roughness curve is -3.1 or more and 0 or less.

[0055] According to the present disclosure, since the average value of the average length RSm of the roughness curve of the surface of the pear skin pattern is 40 μm or more and 135 μm or less, and the average value of the skewness Rsk of the roughness curve is -3.1 or more and 0 or less, damage when the watch component formed with the pear skin pattern is grabbed with tweezers or the like is less likely to be noticeable. Therefore, in the case of assembling a watch, and the like, the watch component can be easily handled, and since damage to the pear skin pattern portion is not noticeable, a decrease in the appearance of the watch component can be suppressed.

[0056] That is, when the average value of the average length RSm is less than 40 μm, the interval of the concave-convex of the pear skin pattern becomes narrow, and therefore, when the watch component is grabbed with tweezers, the plurality of convex portions are flattened and appear to be connected, and thus damage is easily noticeable. In addition, when the average value of the average length RSm is more than 135 μm, the interval of the concave-convex of the pear skin pattern becomes too wide, and the similarity to the pear skin pattern decreases.

[0057] In addition, when the skewness Rsk is less than -3.1, the convex portions of the pear skin pattern become flat, and the area thereof also greatly increases compared to the concave portions, and thus the similarity to the pear skin pattern decreases. In addition, when the skewness Rsk is more than 0, the convex portions become sharp, and when tweezers or the like are contacted, the convex portions are easily flattened, and damage is easily noticeable.

[0058] Therefore, by making the average length RSm of the roughness curve of the surface processed by the concave-convex processing 40 μm or more and 135 μm or less, and making the skewness Rsk -3.1 or more and 0 or less, the pear skin pattern can be expressed, and since the convex portions are less likely to be flattened when grabbed with tweezers, damage is less likely to be noticeable, and thus a decrease in the design of the watch component can be suppressed.

[0059] In the watch component of the present disclosure, it is preferable that an average value of a root mean square height Rq of the roughness curve be 0.7 μm or more and 1.8 μm or less.

[0060] Since the average value of the root mean square height Rq of the roughness curve of the surface of the pear skin pattern is 0.7 μm or more and 1.8 μm or less, the design property of the pear skin pattern can be improved. That is, the root mean square height Rq corresponds to the standard deviation of the height, and thus in a case where the average value of the root mean square height Rq is as small as less than 0.7 μm, the deviation of the height of the concave-convex becomes small, and becomes a regular concave-convex, and thus the similarity to the pear skin pattern is reduced. Also, in a case where the average value of the root mean square height Rq is greater than 1.8 μm, the deviation of the height of the concave-convex becomes too large, and thus the similarity to the pear skin pattern is reduced. In contrast to this, by making the average value of the root mean square height Rq 0.7 μm or more and 1.8 μm or less, the design property of the pear skin pattern can be improved.

[0061] In the timepiece component of the present disclosure, it is preferable that the average value of the arithmetic mean height Ra of the roughness curve be 0.6 μm or more and 1.5 μm or less.

[0062] Since the average value of the arithmetic mean height Ra of the roughness curve of the surface of the pear skin pattern is 0.6 μm or more and 1.5 μm or less, the design property of the pear skin pattern can be improved. That is, in a case where the average value of the arithmetic mean height Ra is as small as less than 0.6 μm, the height of the concave-convex becomes small, and the similarity to the pear skin pattern is reduced. Also, in a case where the average value of the arithmetic mean height Ra is greater than 1.5 μm, the height of the concave-convex becomes too large, and thus the similarity to the pear skin pattern is reduced. In contrast to this, by making the average value of the arithmetic mean height Ra 0.6 μm or more and 1.5 μm or less, the design property of the pear skin pattern can be improved.

[0063] In the timepiece component of the present disclosure, it is preferable that the pear skin pattern be formed by irradiating laser light to the timepiece component.

[0064] In a case where the pear skin pattern is formed by irradiation of laser light, by using the registered processing pattern, the same pear skin pattern can be reproduced, and thus a timepiece component of which the product quality is stable can be obtained.

[0065] In the timepiece component of the present disclosure, it is preferable that the pear skin pattern be formed by scanning laser light to the timepiece component from a plurality of directions.

[0066] By scanning laser light in a plurality of directions, a pear skin pattern in which the pear skin feeling is further improved can be formed.

[0067] In the timepiece component of the present disclosure, it is preferable that the timepiece component be any of a dial, a case, a back cover, a bottom plate, a balance, a second bridge, a train bridge, a balance spring mechanism bridge, and a backside object presser.

[0068] According to the present disclosure, since a pear skin pattern can be expressed on the watch component and damage when grasped with tweezers is not easily noticeable, the assembly workability of the watch component can be improved, and thus the designability of the watch component can be inhibited from decreasing.

[0069] In the watch component of the present disclosure, preferably, the base material of the watch component is any of brass, titanium, stainless steel, pure iron, white brass, hard aluminum, steel, and alloys thereof.

[0070] By using various metal materials as the base material and performing rough surface processing using laser processing, a watch component with a high-class feel can be provided. In addition, in laser processing, processing can be easily performed by adjusting the output and the like according to the type of the base material, and the setting of the processing area is also easy, so the productivity can be improved compared to sandblasting processing.

[0071] The manufacturing method of the watch component of the present disclosure forms a pear skin pattern in a processing area of a base material by irradiating laser light on the base material, characterized in that the manufacturing method of the watch component processes so that the average value of the average length RSm of the roughness curve of the surface of the pear skin pattern is 40 μm or more and 135 μm or less, and the average value of the skewness Rsk of the roughness curve is -3.1 or more and 0 or less.

[0072] According to the present disclosure, since a pear skin pattern is processed in which the average value of the average length RSm of the roughness curve of the surface is 40 μm or more and 135 μm or less, and the average value of the skewness Rsk of the roughness curve is -3.1 or more and 0 or less, damage when the watch component on which the pear skin pattern is formed is grasped with tweezers or the like is not easily noticeable. Therefore, in the case of assembling a watch or the like, the watch component can be easily handled, and since damage to the pear skin pattern portion is not noticeable, the designability of the watch component can be inhibited from decreasing.

[0073] In the manufacturing method of the watch component of the present disclosure, preferably, processing is performed so that the average value of the root mean square height Rq of the roughness curve is 0.7 μm or more and 1.8 μm or less.

[0074] According to the present disclosure, since a pear skin pattern is processed in which the average value of the root mean square height Rq of the roughness curve of the surface is 0.7 μm or more and 1.8 μm or less, when a concave-convex is formed in a processing area by laser irradiation, the designability of the pear skin pattern can be improved.

[0075] In the manufacturing method of the watch component of the present disclosure, preferably, processing is performed so that the average value of the arithmetic mean height Ra of the roughness curve is 0.6 μm or more and 1.5 μm or less.

[0076] According to the present disclosure, since the average value of the arithmetic average height Ra of the roughness curve of the machined surface is 0.6 μm or more and 1.5 μm or less, the designability of the pear skin pattern can be improved when forming the concave-convex by laser irradiation in the machined region.

Claims

1. A component for clocks and watches, characterized in that, The watch components are formed with a pear-skin pattern. The average length RSm of the roughness curve of the pear-skin patterned surface is greater than 40 μm and less than 135 μm. The average value of the skewness Rsk of the roughness curve is above -3.1 and below 0.

2. The watch component according to claim 1, characterized in that, The average value of the root mean square height Rq of the roughness curve is above 0.7 μm and below 1.8 μm.

3. The watch component according to claim 1 or 2, characterized in that, The average value of the arithmetic mean height Ra of the roughness curve is greater than 0.6 μm and less than 1.5 μm.

4. The watch component according to claim 1 or 2, characterized in that, The pear-skin pattern is formed by irradiating the watch components with a laser.

5. The watch component according to claim 4, characterized in that, The pear-skin pattern is formed by scanning the watch components with a laser from multiple directions.

6. The watch component according to claim 1 or 2, characterized in that, The watch components are any one of the following: dial, case, back cover, base plate, pendulum, second plate, gear train plate, balance wheel and hairspring mechanism plate, and back side pressing component.

7. The watch component according to claim 1 or 2, characterized in that, The base material of the watch component is any one of brass, titanium, stainless steel, pure iron, zinc-copper alloy, duralumin, steel, and alloys containing at least one of these metals.

8. A method for manufacturing a watch component, characterized in that, The method for manufacturing the watch component involves irradiating a substrate with a laser to form a pear-skin-like pattern in the processing area of ​​the substrate. The manufacturing method of the watch component is to process the surface such that the average length RSm of the roughness curve of the pear-skin pattern is 40 μm or more and 135 μm or less, and the average skewness Rsk of the roughness curve is -3.1 or more and 0 or less.

9. The method for manufacturing a watch component according to claim 8, characterized in that, The manufacturing method of the watch component is to process the material such that the average value of the root mean square height Rq of the roughness curve is 0.7 μm or more and 1.8 μm or less.

10. The method for manufacturing a watch component according to claim 8 or 9, characterized in that, The manufacturing method of the watch component is carried out in such a way that the average value of the arithmetic mean height Ra of the roughness curve is 0.6 μm or more and 1.5 μm or less.

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