Component for timepiece, timepiece, and manufacturing method for component for timepiece

Abstract

A timepiece component, a timepiece, and a manufacturing method of a timepiece component exhibit a black color with a very low value of luminance L*. The timepiece component has a base material, and a multilayer film covering at least a part of the base material, a plurality of recesses being formed on a surface of the base material opposite to the multilayer film, the plurality of recesses being defined by a first edge and a second edge inclined with respect to the first edge and abutting against the first edge at an end portion when the base material is cut along a thickness direction and observed in a cross section, a ratio of a length of the second edge along the thickness direction of the base material to a length of the second edge along a direction perpendicular to the thickness direction of the base material being greater than 1 / 2 when observed in the cross section, the multilayer film including three or more color absorbing films composed of a material containing Cr, a value of luminance L* in an L*a*b* color space being 10 or less when observed in a plan view from the thickness direction of the base material.

Description

Technical Field

[0001] This invention relates to watch components, watches, and methods for manufacturing watch components. Background Technology

[0002] Patent Document 1 discloses a watch component in which a color-adjusting film for adjusting hue is laminated on a substrate that serves as a metallic luster portion. In the watch component of Patent Document 1, the hue of the appearance is adjusted by utilizing the metallic luster portion and the color-adjusting film, thereby achieving excellent aesthetics even without using precious metals as the main material.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2018-124269 Summary of the Invention

[0004] While patent document 1 can achieve the aesthetic appeal of precious metals, it is difficult to significantly reduce light reflectivity through a color-correcting film, thus making it difficult to achieve a black with a very low brightness L* value like Vantablack.

[0005] The watch component disclosed herein is characterized in that it comprises: a substrate; and a multilayer film covering at least a portion of the substrate, wherein a plurality of recesses are formed on the surface of the substrate opposite to the multilayer film, and when the substrate is cut in the thickness direction for cross-sectional observation, the plurality of recesses are defined by a first side and a second side, the second side being inclined relative to the first side and abutting against the first side at its end; when the cross-sectional observation is performed, the ratio of the length of the second side along the thickness direction of the substrate to the length of the second side along the direction perpendicular to the thickness direction of the substrate is greater than 1 / 2; the multilayer film comprises three or more color absorption films made of a Cr-containing material; and when viewed from above in the thickness direction of the substrate, the value of luminance L* in the L*a*b* color space is 10 or less.

[0006] The watch component disclosed herein is characterized in that it comprises: a substrate; and a multilayer film covering at least a portion of the substrate, wherein a plurality of recesses are formed on the surface of the substrate opposite to the multilayer film, and when the substrate is cut in the thickness direction for cross-sectional observation, the plurality of recesses are defined by a first side and a second side, the second side being inclined relative to the first side and abutting against the first side at its end; when the cross-sectional observation is performed, the ratio of the length of the second side along the thickness direction of the substrate to the length of the second side along the direction perpendicular to the thickness direction of the substrate is greater than 1 / 2; when viewed from above in the thickness direction of the substrate, the value of luminance L* in the L*a*b* color space is 10 or less; and when the multilayer film is configured as a plane, when viewed from above in the thickness direction of the multilayer film, the value of luminance L* of the multilayer film is 18 or less.

[0007] The clock disclosed herein is characterized by having the aforementioned clock components.

[0008] The present invention discloses a method for manufacturing a watch component, characterized in that the watch component comprises a substrate and a multilayer film covering at least a portion of the substrate. The method for manufacturing the watch component comprises the following steps: forming a plurality of recesses on the surface of the substrate; and stacking the multilayer film on at least a portion of the surface of the substrate in which the plurality of recesses are formed. When the substrate is cut in the thickness direction for cross-sectional observation, the plurality of recesses are defined by a first side and a second side, the second side being inclined relative to the first side and abutting against the first side at its end. In the cross-sectional observation, the ratio of the length of the second side along the thickness direction of the substrate to the length of the second side along the direction perpendicular to the thickness direction of the substrate is greater than 1 / 2. The multilayer film comprises three or more color absorption films made of a Cr-containing material. When viewed from above in the thickness direction of the substrate, the value of the luminance L* in the L*a*b* color space is 10 or less.

[0009] The method for manufacturing a watch component disclosed herein is characterized in that the watch component comprises a substrate and a multilayer film covering at least a portion of the substrate. The method for manufacturing the watch component comprises the following steps: forming a plurality of recesses on the surface of the substrate; and stacking the multilayer film on at least a portion of the surface of the substrate in which the plurality of recesses are formed. When the substrate is cut in the thickness direction for cross-sectional observation, the plurality of recesses are defined by a first side and a second side, the second side being inclined relative to the first side and abutting against the first side at its end. In the cross-sectional observation, the ratio of the length of the second side along the thickness direction of the substrate to the length of the second side along the direction perpendicular to the thickness direction of the substrate is greater than 1 / 2. When viewed from above in the thickness direction of the substrate, the value of luminance L* in the L*a*b* color space is 10 or less. When the multilayer film is arranged as a plane, when viewed from above in the thickness direction of the multilayer film, the value of luminance L* of the multilayer film is 18 or less.

[0010] The clock of the present invention is characterized in that it is constructed using a clock component manufactured by the aforementioned method for manufacturing clock components. Attached Figure Description

[0011] Figure 1 This is a front view showing the clock according to the first embodiment.

[0012] Figure 2 This is a cross-sectional view showing the main part of the main body of the dial according to the first embodiment.

[0013] Figure 3 This is an enlarged cross-sectional view showing the main part of the main body of the dial according to the first embodiment.

[0014] Figure 4 This is an enlarged perspective view showing the main part of the main body of the dial according to the first embodiment.

[0015] Figure 5 This is a graph showing the relationship between the ratio of the length V of the hypotenuse in the thickness direction of the substrate to the length H of the hypotenuse in the direction perpendicular to the thickness direction of the substrate and the brightness L*.

[0016] Figure 6 This is a cross-sectional view showing the main part of the dial body of the second embodiment.

[0017] Figure 7 This is an enlarged cross-sectional view showing the main part of the dial body of the second embodiment.

[0018] Label Explanation

[0019] 1: Clock; 2: Case; 3: Second hand; 4: Minute hand; 5: Hour hand; 7: Crown; 8: Button A; 9: Button B; 10: Dial (clock component); 11, 11A: Main body of the dial; 12: Hour marker; 30, 30A: Substrate; 31, 31A: Base layer; 32, 32A: Multilayer film; 33, 33A: Protective layer; 301, 301A: Surface; 302, 302A: Recess; 321: Color absorption film; 322: Color adjustment film; 3211: Chromium color absorption film; 3221: Alumina color adjustment film; 3222: Silica color adjustment film; D: Bevel (second side); L: Straight side (first side). Detailed Implementation

[0020] [First Implementation Method]

[0021] Hereinafter, the clock 1 according to the embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0022] Figure 1 This is a front view showing clock 1. In this embodiment, clock 1 is configured as a wristwatch worn on the user's wrist.

[0023] like Figure 1 , Figure 2 As shown, the clock 1 has a metal case 2. Inside the case 2, there is a circular dial 10, a second hand 3, a minute hand 4, an hour hand 5, a crown 7, a button A 8, and a button B 9. The dial 10 has a main body 11 and hour markers 12 on the main body 11. The dial 10 is an example of a clock component disclosed herein.

[0024] Additionally, the main body of the dial 11 is identified as a very low-brightness black, but... Figure 1 The main body of the dial is represented by a plain white color 11.

[0025] [Dial Body]

[0026] Figure 2 This is a cross-sectional view showing the main parts of the dial body 11. Figure 3 This is an enlarged cross-sectional view showing the main parts of the dial body 11. Figure 4 This is an enlarged perspective view showing the main parts of the dial body 11. Additionally, Figure 2 , Figure 3 It is a cross-sectional view of the base material 30 of the main body 11 of the dial being cut along the thickness direction.

[0027] like Figures 2-4As shown, the main body 11 of the dial is configured to include a substrate 30, a base layer 31, a multilayer film 32, and a protective layer 33. In this embodiment, the entire substrate 30 is covered by the base layer 31, the multilayer film 32, and the protective layer 33. That is, the base layer 31, the multilayer film 32, and the protective layer 33 are stacked in such a way that they cover the entire surface 301 of the substrate 30.

[0028] In addition, the main body of the dial 11 is not limited to the above structure. For example, the base layer 31, the multilayer film 32 and the protective layer 33 may be laminated in a way that covers a part of the surface 301 of the substrate 30.

[0029] [Substrate]

[0030] The substrate 30 is made of metals such as iron, brass, and aluminum, or resin. In addition, when the substrate 30 is made of resin, the resin can be a non-transparent resin that does not allow light to pass through, or it can be a transparent resin that allows light to pass through.

[0031] Furthermore, in this embodiment, a plurality of recesses 302 are formed on the surface 301 of the substrate 30 of the main body portion 11 of the dial.

[0032] [concave]

[0033] When the substrate 30 is cut along its thickness direction for cross-sectional observation, the recess 302 is defined by a straight edge L and a beveled edge D, the beveled edge D being inclined relative to the straight edge L and abutting against the straight edge L at its end. Furthermore, the straight edge L is inclined in a manner that is linearly symmetrical with respect to the axis of symmetry A1 extending along the thickness direction of the substrate 30 and the beveled edge D. More specifically, in this embodiment, as... Figure 4 As shown, the recess 302 is formed with a plurality of conical protrusions on the surface 301.

[0034] Furthermore, the straight side L is an example of the first side of this disclosure, and the inclined side D is an example of the second side of this disclosure. Additionally, the depth of the recess 302 is not particularly limited; for example, the depth of the recess 302 is approximately tens of μm.

[0035] Furthermore, in this embodiment, the recess 302 is formed such that the ratio of the length V of the inclined side D along the thickness direction of the substrate 30 to the length H of the inclined side D along the direction perpendicular to the thickness direction of the substrate 30 is greater than 1 / 2. That is, the recess 302 is formed in such a way that the ratio of V to H is greater than 1:2.

[0036] In other words, when the length V of the inclined edge D in the thickness direction of the substrate 30 is set to 1, the recess 302 is formed in such a way that the length H of the inclined edge D in the direction perpendicular to the thickness direction of the substrate 30 is less than 2, that is, H is less than twice V.

[0037] [Basal layer]

[0038] A substrate layer 31 is stacked on the surface 301 of the substrate 30. In this embodiment, the substrate layer 31 is formed, for example, by plating Ni. In this embodiment, by stacking the substrate layer 31 on the surface 301 of the substrate 30, a multilayer film 32 can be easily stacked.

[0039] [Multilayer film]

[0040] The multilayer film 32 is composed of a color absorption film 321 and a color adjustment film 322, and is stacked on the base layer 31.

[0041] The color absorption film 321 is formed using a metal. Preferably, the metal constituting the color absorption film 321 is Ag, Pt, Au, Cu, Al, Cr, Sn, Fe, Ti, or alloys thereof.

[0042] There are no particular limitations on the method for forming the color absorption film 321, and examples include ion-assisted evaporation, ion plating, vacuum evaporation, and sputtering. Therefore, the layer structure of the multilayer film 32 can be arbitrarily varied.

[0043] In this embodiment, the color absorption film 321 has three layers of chromium color absorption film 3211 made of a chromium-containing material. This reduces the reflectivity of light incident on the multilayer film 32.

[0044] Color adjustment film 322 is a film that adjusts hue through optical interference. In this embodiment, color adjustment film 322 is composed of a multilayer film including an inorganic film. Specifically, color adjustment film 322 is preferably composed of Ta2O5, SiO2, TiO2, Al2O3, ZrO2, Nb2O5, HfO2, and Na5Al3F. 14 The material is composed of at least one of Na3AlF6, AlF3, MgF2, CaF2, BaF2, YF3, LaF3, CeF3, and NdF3. Therefore, due to the high chemical stability of these inorganic materials, the appearance stability and durability of the watch components can be improved. Furthermore, it can increase the variation range of black colors with lower brightness (L*).

[0045] In this embodiment, the color adjustment film 322 comprises an alumina color adjustment film 3221 made of an Al2O3-containing material and a silicon dioxide color adjustment film 3222 made of a SiO2-containing material. Furthermore, a chromium color absorption film 3211 is stacked on the alumina color adjustment film 3221. That is, in this embodiment, the multilayer film 32 has multiple portions where a chromium color absorption film 3211 made of a Cr-containing material and an alumina color adjustment film 3221 made of an Al2O3-containing material are stacked together. This further reduces the reflectivity of light incident on the multilayer film 32, thus achieving a very low brightness L* value for black.

[0046] In addition, the multilayer film 32 is not limited to the above structure, and the order of the color absorption film 321 and the color adjustment film 322 can be set arbitrarily.

[0047] Furthermore, there are no particular limitations on the method for forming the color adjustment film 322, and examples include ion-assisted evaporation, ion plating, vacuum evaporation, and sputtering. Therefore, the layer structure of the multilayer film 32 can be arbitrarily varied.

[0048] [Protective Layer]

[0049] The protective layer 33 is a transparent layer laminated on the surface of the multilayer film 32. In this embodiment, the protective layer 33 is formed of a transparent resin such as acrylic acid.

[0050] [Dial Manufacturing Method]

[0051] Next, the manufacturing method of dial 10 will be explained.

[0052] First, a plurality of the aforementioned recesses 302 are formed on the surface 301 of the substrate 30 of the dial body portion 11 of the dial 10. For example, the recesses 302 are formed on the surface 301 of the substrate 30 by machining such as cutting, laser machining, chemical removal machining, grinding, forging / casting. At this time, the recesses 302 are formed in such a way that the ratio of the length V of the inclined side D along the thickness direction of the substrate 30 to the length H of the inclined side D along the direction perpendicular to the thickness direction of the substrate 30 is greater than 1 / 2, thereby forming a plurality of conical protrusions on the surface 301.

[0053] Next, a base layer 31, a multilayer film 32, and a protective layer 33 are stacked on the surface 301 of the substrate 30 of the dial body 11. Specifically, a color absorption film 321 is formed on the surface 301 of the substrate 30 by ion-assisted evaporation, ion plating, vacuum evaporation, sputtering, or the like. Then, the base layer 31, the color absorption film 321, the color adjustment film 322, and the protective layer 33 are stacked by ion-assisted evaporation, ion plating, vacuum evaporation, sputtering, or the like. This allows the manufacture of the dial 10.

[0054] Furthermore, by using the dial 10 manufactured using such a manufacturing method in the clock 1, the clock 1 can be manufactured.

[0055] Furthermore, in this embodiment, by using machining, laser machining, chemical removal machining, grinding machining, forging / casting machining, etc., to form the recess 302, the inclination of the inclined edge D in the recess 302 can be arbitrarily varied.

[0056] Figure 5 This is a graph showing the relationship between the ratio of the length V of the inclined side D in the thickness direction of the substrate 30 and the length H of the inclined side D in the direction perpendicular to the thickness direction of the substrate 30, and the brightness L*. Figure 5 In this process, for a substrate 30 made of brass, a recess 302 is formed with the ratio of the length V of the inclined edge in the thickness direction of the substrate 30 to the length H of the inclined edge in the direction perpendicular to the thickness direction of the substrate 30 being 1:1 to 1:10. A base layer 31, a multilayer film 32, and a protective layer 33 are stacked on the surface 301 of the substrate 30, and the luminance L* is measured. The luminance L* is measured using a spectrophotometer, with the measurement conditions set as positive reflected light measurement, light source D65, and viewing angle 10°.

[0057] Here, in Figure 5 In the middle, in the multilayer film 32, it is with Figure 3 The color absorption film 321 and color adjustment film 322 shown have the same structure, and when the multilayer film 32 is arranged as a plane, the brightness L* value is 18 when viewed from above in the thickness direction of the multilayer film 32. Furthermore, the substrate 30 with the recess 302 is formed such that, in the state where the multilayer film 32 is not stacked, the brightness L* value is 32 when viewed from above in the thickness direction of the substrate 30.

[0058] Furthermore, in this disclosure, luminance L* refers to the value of luminance in the L*a*b* color space as defined by the CIE (Commission Internationale d'Eclairage; International Commission on Illumination). A value of L* of "0" represents the luminance of an object that does not reflect light at all (absorbs light completely), and a value of L* of "100" represents the luminance of white light that reflects light completely.

[0059] like Figure 5 As shown, it is evident that as the ratio of the length V of the inclined edge in the thickness direction of the substrate 30 to the length H of the inclined edge in the direction perpendicular to the thickness direction of the substrate 30 increases, the value of luminance L* decreases. In particular, it is evident that when the ratio of the length V of the inclined edge in the thickness direction of the substrate 30 to the length H of the inclined edge in the direction perpendicular to the thickness direction of the substrate 30 is greater than 1:2 (…), Figure 5The region to the left of the V:H ratio (represented by the horizontal axis) indicates that when the ratio of the length V of the inclined side D along the thickness direction of the substrate 30 to the length H of the inclined side D in the direction perpendicular to the thickness direction of the substrate 30 is greater than 1 / 2, the value of luminance L* can be made less than 10. This is presumably because by increasing the ratio of the length V of the inclined side in the thickness direction of the substrate 30 to the length H of the inclined side in the direction perpendicular to the thickness direction of the substrate 30, the inclination of the inclined side D relative to the straight side L increases, thus reducing the reflectivity of light incident on the recess 302.

[0060] Furthermore, the multilayer film 32 includes three chromium color absorbing films 3211 made of Cr-containing materials, and has multiple portions where the chromium color absorbing films 3211 and the alumina color adjustment film 3221 are stacked together. Therefore, it is deduced that the reflectivity of light incident on the multilayer film 32 can be reduced, and the brightness L* of the multilayer film 32 itself can be reduced to a value as low as 18.

[0061] Therefore, in this embodiment, when viewed from above in the thickness direction of the substrate 30, the value of brightness L* can be set to 10 or less, thereby achieving a black with a very low value of brightness L*, such as Vantaa Black.

[0062] [Effects of the Implementation Method]

[0063] According to this embodiment, the following effects can be obtained.

[0064] In this embodiment, a plurality of recesses 302 are formed on the surface 301 of the substrate 30 opposite to the multilayer film 32. Furthermore, when the substrate 30 is cut along its thickness direction for cross-sectional viewing, the plurality of recesses 302 are defined by a straight edge L and an inclined edge D that is inclined relative to the straight edge L and abuts against the straight edge L at its end. The ratio of the length V of the inclined edge D along the thickness direction of the substrate 30 to the length H of the inclined edge D along the direction perpendicular to the thickness direction of the substrate 30 is greater than 1 / 2. This reduces the reflectivity of light incident on the recesses 302. In addition, the multilayer film 32 includes three layers of chromium color-absorbing film 3211 made of a chromium-containing material, thus reducing the reflectivity of light incident on the multilayer film 32. Therefore, when viewed from above in the thickness direction of the substrate 30, since the value of brightness L* can be set to 10 or less, a black with a very low brightness L* value, such as Vantaa Black, can be achieved.

[0065] In this embodiment, when the multilayer film 32 is configured as a plane, the brightness L* value of the multilayer film 32 is as low as 18 or less when viewed from above in the thickness direction, thus enabling the achievement of a very low brightness L* value for black.

[0066] The multilayer film 32 comprises Ta2O5, SiO2, TiO2, Al2O3, ZrO2, Nb2O5, HfO2, and Na5Al3F. 14 The color adjustment film 322, composed of at least one of the materials selected from Na3AlF6, AlF3, MgF2, CaF2, BaF2, YF3, LaF3, CeF3, and NdF3, can improve the stability and durability of the appearance of the dial 10. Furthermore, it can increase the variation range of black with a low brightness L* value.

[0067] In this embodiment, the multilayer film 32 has multiple portions where the chromium color absorption film 3211 and the aluminum oxide color adjustment film 3221 are stacked together, thus further reducing the reflectivity of light incident on the multilayer film 32 and achieving a black with a very low brightness L* value.

[0068] In this embodiment, the recess 302 is formed using any one of machining, laser machining, chemical removal machining, grinding machining, and forging / casting. This allows the inclination of the inclined edge D in the recess 302 to be varied arbitrarily.

[0069] In this embodiment, the multilayer film 32 is formed using any one of ion-assisted evaporation, ion plating, vacuum evaporation, and sputtering. Therefore, the layer structure of the multilayer film 32 can be arbitrarily varied.

[0070] [Second Implementation]

[0071] Next, based on Figure 6 , Figure 7 The second embodiment of this disclosure will be described. In the second embodiment, the recess 302A of the dial body portion 11A is defined by a curved first side L1 and a curved second side D1, which differs from the first embodiment described above.

[0072] In addition, in the second embodiment, the same reference numerals are used for structures that are the same as or identical to those in the first embodiment, and descriptions are omitted or simplified.

[0073] [Dial Body]

[0074] Figure 6 This is a cross-sectional view showing the main part of the dial body 11A. Figure 7 This is an enlarged cross-sectional view showing the main part of the dial body 11A. Additionally, Figure 6 , Figure 7 It is a cross-sectional view of the base material 30A of the main body 11A of the dial, cut along the thickness direction.

[0075] like Figure 6 , Figure 7As shown, the main body portion 11A of the dial is similarly configured to have a substrate 30A, a base layer 31A, a multilayer film 32A, and a protective layer 33A, as described in the first embodiment.

[0076] [concave]

[0077] When the substrate 30A is cut along its thickness direction for cross-sectional observation, the recess 302A is defined by a first side L1 and a second side D1 that is inclined relative to the first side L1 and abuts against the first side L1 at its end. Moreover, in this embodiment, the first side L1 and the second side D1 are curved.

[0078] In addition, similar to the first embodiment described above, the recess 302A is formed with a plurality of conical protrusions on the surface 301A.

[0079] Furthermore, similar to the first embodiment described above, the recess 302A is formed such that the ratio of the length V of the second side D1 along the thickness direction of the substrate 30A to the length H of the second side D1 along the direction perpendicular to the thickness direction of the substrate 30A is greater than 1 / 2. That is, the recess 302A is formed such that the ratio of V to H is greater than 1:2.

[0080] [Effects of the Second Embodiment]

[0081] According to this embodiment, the following effects can be obtained.

[0082] In this embodiment, the first side L1 and the second side D1 of the recess 302A are bent. Therefore, the sides of the recess 302A are not limited to straight lines, thus increasing the degree of freedom in the processing used to form the recess 302A.

[0083] [Variation Example]

[0084] Furthermore, the present invention is not limited to the embodiments described above, and modifications and improvements made within the scope of achieving the purpose of the present invention are also included in the present invention.

[0085] In the embodiments described above, the multilayer films 32 and 32A have three layers of chromium color absorbing film 3211 made of a chromium-containing material, but are not limited to this. For example, the chromium absorbing film of the multilayer film may be two layers or less. Even in this case, by making the value of the luminance L* of the multilayer film 18 or less, the reflectivity of light incident on the multilayer film can be reduced. Therefore, when viewed from above in the thickness direction of the substrate, the value of the luminance L* in the L*a*b* color space can be made 10 or less, and a black with a very low luminance L* value, such as Vantaa Black, can be achieved.

[0086] In addition, the multilayer films 32 and 32A may also have three or more layers of chromium absorption films made of Cr-containing materials.

[0087] In the above embodiments, the recesses 302 and 302A are formed using any one of cutting, laser processing, chemical removal, grinding, and forging / casting processes, but are not limited to these. For example, the recesses can also be formed using femtosecond laser processing or picosecond laser processing. This allows for more precise variation of the inclination of the second side of the recess.

[0088] In the above embodiments, recesses 302 and 302A are formed on the substrates 30 and 30A of the main body portions 11 and 11A of the dial, and multilayer films 32 and 32A are laminated on the surfaces 301 and 301A of the substrates 30 and 30A, but this is not a limitation. For example, recesses may be formed on the substrate of the hour markers on the dial, and multilayer films may be laminated. Furthermore, the inclination of the inclined edges of the main body portions of the dial and the hour markers relative to the straight edges may be different. As a result, a slightly different shade of black can be distinguished in the main body portions of the dial and the hour markers, which improves the design.

[0089] In the above embodiments, the watch component of this disclosure is configured as a dial 10, but is not limited thereto. For example, the watch component of this disclosure may also be configured as any one of a case, a dial ring, a glass edge, a movement, a hand, and a pendulum.

[0090] [Summary of this disclosure]

[0091] The watch component disclosed herein is characterized in that it comprises: a substrate; and a multilayer film covering at least a portion of the substrate, wherein a plurality of recesses are formed on the surface of the substrate opposite to the multilayer film.

[0092] When the substrate is cut along its thickness direction for cross-sectional observation, the plurality of recesses are defined by a first side and a second side, the second side being inclined relative to the first side and abutting against the first side at its end. In the cross-sectional observation, the ratio of the length of the second side along the thickness direction of the substrate to the length of the second side along the direction perpendicular to the thickness direction of the substrate is greater than 1 / 2. The multilayer film comprises three or more color absorption films made of a Cr-containing material. When viewed from above in the thickness direction of the substrate, the value of luminance L* in the L*a*b* color space is less than 10.

[0093] In this disclosure, a plurality of recesses are formed on the surface of the substrate opposite to the multilayer film. Furthermore, when the substrate is cut along its thickness direction for cross-sectional viewing, the plurality of recesses are defined by a first side and a second side inclined relative to the first side and abutting against the first side at its end. The ratio of the length of the second side along the thickness direction of the substrate to the length of the second side along a direction perpendicular to the thickness direction of the substrate is greater than 1 / 2. This reduces the reflectivity of light incident on the recesses. Moreover, in this disclosure, the multilayer film comprises three or more color-absorbing films made of a Cr-containing material, thus reducing the reflectivity of light incident on the multilayer film. Therefore, when viewed from above in the thickness direction of the substrate, since the luminance L* value in the L*a*b* color space can be made 10 or less, a black with a very low luminance L* value, such as Vantaa Black, can be achieved.

[0094] In the watch components disclosed herein, when the multilayer film is configured as a plane, the value of the brightness L* of the multilayer film is 18 or less when viewed from above in the thickness direction of the multilayer film.

[0095] This reduces the brightness of the multilayer film itself, thus enabling the achievement of a very low brightness L* value for black.

[0096] In the watch component of the present invention, the multilayer film may also include a color adjustment film, which is composed of Ta2O5, SiO2, TiO2, Al2O3, ZrO2, Nb2O5, HfO2, and Na5Al3F. 14 It consists of at least one of the following materials: Na3AlF6, AlF3, MgF2, CaF2, BaF2, YF3, LaF3, CeF3, and NdF3.

[0097] Therefore, due to the high chemical stability of these inorganic materials, the appearance stability and durability of watch components can be improved. Furthermore, the variation range of black with a low brightness (L*) value can be increased.

[0098] In the watch components disclosed herein, the color absorption film may be a film made of a material containing Cr, or a film made of a material containing at least one of Ag, Pt, Au, Cu, Al, Cr, Sn, Fe, and Ti.

[0099] Therefore, as a component for watches, it can achieve a high-end appearance.

[0100] In the watch components disclosed herein, the multilayer film may also have multiple portions where the color absorption film made of a Cr-containing material and the color adjustment film made of an Al2O3-containing material are stacked together.

[0101] This allows for a further reduction in the reflectivity of light incident on the multilayer film, thus enabling the achievement of black with a very low brightness L* value.

[0102] The watch component disclosed herein is characterized in that it comprises: a substrate; and a multilayer film covering at least a portion of the substrate, wherein a plurality of recesses are formed on the surface of the substrate opposite to the multilayer film, and when the substrate is cut in the thickness direction for cross-sectional viewing, the plurality of recesses are defined by a first side and a second side inclined relative to the first side and abutting against the first side at its end; in the cross-section, the ratio of the length of the second side along the thickness direction of the substrate to the length of the second side along the direction perpendicular to the thickness direction of the substrate is greater than 1 / 2; when viewed from above in the thickness direction of the substrate, the value of luminance L* in the L*a*b* color space is 10 or less; and when the multilayer film is configured as a plane, when viewed from above in the thickness direction of the multilayer film, the value of luminance L* of the multilayer film is 18 or less.

[0103] In this disclosure, a plurality of recesses are formed on the surface of the substrate opposite to the multilayer film. Furthermore, when the substrate is cut along its thickness direction for cross-sectional viewing, the plurality of recesses are defined by a first side and a second side inclined relative to the first side and abutting against the first side at its end. The ratio of the length of the second side along the thickness direction of the substrate to the length of the second side along a direction perpendicular to the thickness direction of the substrate is greater than 1 / 2. This reduces the reflectivity of light incident on the recesses. Furthermore, in this disclosure, when the multilayer film is configured as a plane, when viewed from above in the thickness direction of the multilayer film, the value of the luminance L* of the multilayer film is 18 or less, thus reducing the reflectivity of light incident on the multilayer film. Therefore, when viewed from above in the thickness direction of the substrate, since the value of the luminance L* in the L*a*b* color space can be made 10 or less, a black with a very low luminance L* value, such as Vantaa Black, can be achieved.

[0104] The clock disclosed herein is characterized by having the aforementioned clock components.

[0105] The present invention discloses a method for manufacturing a watch component, characterized in that the watch component comprises a substrate and a multilayer film covering at least a portion of the substrate. The method for manufacturing the watch component comprises the following steps: forming a plurality of recesses on the surface of the substrate; and stacking the multilayer film on at least a portion of the surface of the substrate in which the plurality of recesses are formed. When the substrate is cut in the thickness direction for cross-sectional observation, the plurality of recesses are defined by a first side and a second side, the second side being inclined relative to the first side and abutting against the first side at its end. In the cross-sectional observation, the ratio of the length of the second side along the thickness direction of the substrate to the length of the second side along the direction perpendicular to the thickness direction of the substrate is greater than 1 / 2. The multilayer film comprises three or more color absorption films made of a Cr-containing material. When viewed from above in the thickness direction of the substrate, the value of the luminance L* in the L*a*b* color space is 10 or less.

[0106] In this disclosure, a plurality of recesses are formed on the surface of the substrate opposite to the multilayer film. Furthermore, when the substrate is cut along its thickness direction for cross-sectional viewing, the plurality of recesses are defined by a first side and a second side inclined relative to the first side and abutting against the first side at its end. The ratio of the length of the second side along the thickness direction of the substrate to the length of the second side along a direction perpendicular to the thickness direction of the substrate is greater than 1 / 2. This reduces the reflectivity of light incident on the recesses. Moreover, in this disclosure, the multilayer film comprises three or more color-absorbing films made of a Cr-containing material, thus reducing the reflectivity of light incident on the multilayer film. Therefore, when viewed from above in the thickness direction of the substrate, since the value of luminance L* in the L*a*b* color space can be set to 10 or less, a black with a very low luminance L* value, such as Vantaa Black, can be achieved.

[0107] The method for manufacturing a watch component disclosed herein is characterized in that the watch component comprises a substrate and a multilayer film covering at least a portion of the substrate. The method for manufacturing the watch component comprises the following steps: forming a plurality of recesses on the surface of the substrate; and stacking the multilayer film on at least a portion of the surface of the substrate in which the plurality of recesses are formed. When the substrate is cut in the thickness direction for cross-sectional observation, the plurality of recesses are defined by a first side and a second side, the second side being inclined relative to the first side and abutting against the first side at its end. In the cross-sectional observation, the ratio of the length of the second side along the thickness direction of the substrate to the length of the second side along the direction perpendicular to the thickness direction of the substrate is greater than 1 / 2. When viewed from above in the thickness direction of the substrate, the value of luminance L* in the L*a*b* color space is 10 or less. When the multilayer film is arranged as a plane, when viewed from above in the thickness direction of the multilayer film, the value of luminance L* of the multilayer film is 18 or less.

[0108] In this disclosure, a plurality of recesses are formed on the surface of the substrate opposite to the multilayer film. Furthermore, when the substrate is cut along its thickness direction for cross-sectional viewing, the plurality of recesses are defined by a first side and a second side inclined relative to the first side and abutting against the first side at its end. The ratio of the length of the second side along the thickness direction of the substrate to the length of the second side along a direction perpendicular to the thickness direction of the substrate is greater than 1 / 2. This reduces the reflectivity of light incident on the recesses. Furthermore, in this disclosure, when the multilayer film is configured as a plane, when viewed from above in the thickness direction of the multilayer film, the value of the luminance L* of the multilayer film is 18 or less, thus reducing the reflectivity of light incident on the multilayer film. Therefore, when viewed from above in the thickness direction of the substrate, since the value of the luminance L* in the L*a*b* color space can be made 10 or less, a black with a very low luminance L* value, such as Vantaa Black, can be achieved.

[0109] In the manufacturing method of the watch component disclosed herein, the recess may also be formed by any one of cutting, laser processing, patterning, chemical removal, grinding, and forging / casting.

[0110] Therefore, the inclination of the second side in the concave portion can be varied arbitrarily.

[0111] In the method for manufacturing watch components disclosed herein, the recess may also be formed using femtosecond laser processing or picosecond laser processing.

[0112] This allows for more precise variation of the inclination of the second side of the concave portion.

[0113] In the method for manufacturing watch components disclosed herein, the multilayer film may be formed using any one of ion-assisted evaporation, ion plating, vacuum evaporation, and sputtering.

[0114] This allows for arbitrary changes in the layer structure of multilayer films.

[0115] The clock of the present invention is characterized in that it is constructed using a clock component manufactured by the aforementioned method for manufacturing clock components.

Claims

1. A component for clocks and watches, characterized in that, The watch component includes: Substrate; and A multilayer film covering at least a portion of the substrate, configured to have three or more color absorption films and multiple color adjustment films. Multiple recesses are formed on the surface of the substrate opposite to the multilayer film. When the substrate is cut along its thickness direction for cross-sectional observation, the plurality of recesses are defined by a first side and a second side, the second side being inclined relative to the first side and abutting against the first side at its end. In the cross-sectional view, the ratio of the length of the second side along the thickness direction of the substrate to the length of the second side along the direction perpendicular to the thickness direction of the substrate is greater than 1 / 2. When viewed from above in the thickness direction of the substrate, L a b Brightness L in color space The value is below 10. The multilayer film has multiple locations where the three or more color absorption films and the multiple color adjustment films, which are composed of a material containing Al2O3, are stacked together. The three or more layers of color absorption film are each composed of a Cr-containing material. The plurality of color adjustment films are respectively composed of Ta2O5, SiO2, TiO2, Al2O3, ZrO2, Nb2O5, HfO2, and Na5Al3F. 14 It is composed of at least one of Na3AlF6, AlF3, MgF2, CaF2, BaF2, YF3, LaF3, CeF3 and NdF3.

2. The watch component according to claim 1, characterized in that, When the multilayer film is configured as a planar surface, the brightness L of the multilayer film when viewed from above in the thickness direction is... The value is below 18.

3. The watch component according to claim 1, characterized in that, In addition to having three or more color absorption films made of a Cr-containing material, the multilayer film also has a color absorption film made of a material containing at least one of Ag, Pt, Au, Cu, Al, Cr, Sn, Fe, and Ti.

4. A component for a clock, characterized in that, The watch component includes: Substrate; and A multilayer film covering at least a portion of the substrate, configured to include multiple color absorption films and multiple color adjustment films. Multiple recesses are formed on the surface of the substrate opposite to the multilayer film. When the substrate is cut along its thickness direction for cross-sectional observation, the plurality of recesses are defined by a first side and a second side, the second side being inclined relative to the first side and abutting against the first side at its end. In the cross-sectional view, the ratio of the length of the second side along the thickness direction of the substrate to the length of the second side along the direction perpendicular to the thickness direction of the substrate is greater than 1 / 2. When viewed from above in the thickness direction of the substrate, L a b Brightness L in color space The value is below 10. When the multilayer film is configured as a planar surface, the brightness L of the multilayer film when viewed from above in the thickness direction is... The value is below 18. The multilayer film has multiple portions where the multiple color absorption films and the multiple color adjustment films are stacked together. At least one layer of the plurality of color absorption films is composed of a Cr-containing material. The plurality of color adjustment films are respectively composed of Ta2O5, SiO2, TiO2, Al2O3, ZrO2, Nb2O5, HfO2, and Na5Al3F. 14 It is composed of at least one of Na3AlF6, AlF3, MgF2, CaF2, BaF2, YF3, LaF3, CeF3 and NdF3.

5. A clock, characterized in that, The clock has the clock components as described in claim 1 or 4.

Images