JP4668062B2 - Timepiece for watch, timepiece having the same, and method for manufacturing timepiece for timepiece - Google Patents

Description

  The present invention relates to a timepiece hand, a timepiece including the timepiece, and a method for manufacturing a timepiece hand.

  Conventionally, magnesium alloys are known to be lightweight and have good thermal conductivity and corrosion resistance, and are excellent in plastic working and machinability. For this reason, magnesium alloys are used as various parts such as materials for computers, audio products, communication equipment, aircraft and automobiles.

  However, magnesium or a magnesium alloy is oxidized in the air and a thin oxide film is formed on the surface, so that coating is difficult and adhesion of the coating film is also poor. Further, the corrosion resistance is not sufficient. For this reason, conventionally, magnesium or a magnesium alloy has not been used as a display indicator for a watch. However, in recent years, there has been a demand for a reduction in power consumption due to the need for a smaller and thinner watch and a longer life, and attempts have been made to use a magnesium alloy as a watch indicator (see Patent Document 1). .

  Patent Document 1 discloses a timepiece hand using a magnesium alloy containing a specific amount of Mn.

In Patent Document 2, a dry plating process is performed as a substitute for a roughening process or a surface activation process, which is a pre-process for the surface treatment of magnesium or a magnesium alloy, and then a surface treatment such as dry plating or wet plating is performed. Techniques for applying are disclosed.

  Patent Document 3 discloses a lightweight pointer in which a decorative film made of dry plating, wet plating, or a diamond-like carbon film is formed on the surface of a magnesium alloy.

JP 2001-194469 A JP 2000-219977 A JP 2004-279382 A

  However, according to the timepiece pointer disclosed in Patent Document 1, the magnesium alloy having this specific composition is not a general-purpose product, and the corrosion resistance is not sufficient.

The technique disclosed in Patent Document 2 has a problem that the difference in the surface treatment performance such as corrosion resistance and wear resistance is large depending on the type of plating selected. Therefore, depending on the components used applications, there is a constraint that must be selected to adopt plating.

According to the lightweight guideline disclosed in Patent Document 3, even when direct plating is performed on a magnesium material, a local battery is formed due to a potential difference between the material and the plating, and magnesium is selectively corroded. It was difficult to ensure the corrosion resistance in a bad place. In order to solve such a problem, additional rust prevention treatment by clear coating and surface effect treatment by hard coating treatment are required, which is disadvantageous in terms of cost.

In addition, conventional timepieces made of magnesium or magnesium alloys are formed by wet or dry plating , and may contain harmful substances such as chromium in the recycling process and manufacturing process. It was a problem. In addition, regarding the performance after surface treatment such as corrosion resistance and wear resistance, there is a problem that the difference becomes large depending on the type of plating selected.

  In view of the above problems, aluminum has often been used mainly as a watch pointer. FIG. 3 is a front view of a conventional timepiece 100. Aluminum is used for the pointer 90. Since the weight increases due to the use of aluminum, the pointer 90 is formed with a balancer portion 91 for balancing the weight at the rear end portion of the pointer. As described above, when aluminum is used for the pointer, there are many restrictions such as the length, width, and thickness of the pointer. Therefore, there is a problem that the design change is limited and the weight is increased.

  In addition, long pointers are required for table clocks, wall clocks, and outdoor clocks. Watches that use such long pointers are designed to reduce the distance between the pointers and the distance between the pointers and the dial in order to prevent the pointers and the pointers from contacting the dial due to vibration or transportation during use. It was secured greatly. For this reason, since the thickness of the watch is increased, there is a restriction on the change of the design.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a timepiece for a watch with improved design, a timepiece having the design improved, and a method for manufacturing a timepiece for a timepiece, which can solve problems caused when magnesium or a magnesium alloy is used as a base material. It is to be.

The object can be achieved by the watch hands having a substrate made of magnesium or magnesium alloy, and a surface layer made of anodized film, or between the anodized film and the plated layer.

With this configuration, since it has an anodic oxide film or a surface layer composed of the anodic oxide film and a plating layer, it can provide a watch pointer with excellent corrosion resistance, and problems that occur when magnesium or a magnesium alloy is used as a base material Can be eliminated. Further, by using magnesium or a magnesium alloy as a base material, it is possible to provide a timepiece hand that is superior in light weight and high rigidity as compared with the case where aluminum is used as a base material. Since it is excellent in light weight and high rigidity, restrictions on the length, width and thickness of the pointer are reduced. Therefore, it is possible to provide a timepiece hand with improved design.

  The light reflectance of the surface layer can also be achieved by a timepiece hand that is 65% or more when the reflectance is measured at a measurement angle of 85 °.

  With this configuration, since the light reflectance is 65% or more, it is possible to improve the visibility and provide a timepiece hand with improved design.

  The anodic oxide film is formed by an anodic oxidation method without spark discharge (hereinafter, non-spark discharge type anodic oxidation method), and mainly has a structure of a hole, a wall, and a non-porous layer. It can also be achieved by a watch hand having -99.9%, magnesium oxide 0.1-40% and fine pores with an average pore size of 50-1000 nm.

  The anodic oxide film can also be achieved by a timepiece pointer formed so as to be colored by dye, pigment or electrolytic coloring.

  With this configuration, even when magnesium or a magnesium alloy is used as a base material, it is possible to improve visibility and provide a timepiece hand with improved design.

  The anodized film can also be achieved by a timepiece having electrical insulation.

With this configuration, it is possible to provide a watch hand having excellent corrosion resistance. In particular, when a plating layer is further formed on the anodized film, electrical insulation can be ensured between the anodized film and the plated layer, so that the occurrence of potential difference corrosion can be prevented.

  The timepiece hand can also be achieved by a timepiece hand composed of a hook part and a tip part extending from the hook part and indicating the time.

  This watch pointer is excellent in lightness because it uses magnesium or magnesium alloy as a base material, and even if it does not have a shape to balance the weight, it can keep the balance of the pointer. it can. As a result, it is possible to provide a timepiece hand with improved design and visibility. Moreover, since it does not have the shape for balancing, the weight can be further improved. Further, by applying this pointer to a timepiece in which a solar battery is disposed in the dial, the area of the shadow of the pointer can be reduced, and power efficiency can be improved.

  It can also be achieved by a timepiece having the timepiece hand described above. By providing the timepiece pointer, a timepiece with improved design and visibility can be provided.

  In addition, the above-described clock can be achieved by being a table clock, a wall clock, or an outdoor clock.

  A table clock, wall clock, or outdoor installation timepiece in which hands larger than a predetermined size are used is likely to be restricted by design. Therefore, the use of such timepiece hands can improve design and visibility.

In addition, 0.1 to 7 mol / L of at least one salt of alkali or alkaline earth metal hydroxide, silicate, silicofluoride, and borofluoride is contained, and the film-forming stabilizer is 0.8. A watch pointer base material made of magnesium or a magnesium alloy is immersed in an aqueous electrolytic solution to which 01 to 0.5 mol / L is added, and this is immersed in a bath temperature of 30 to 80 ° C. and a current density of 0.5 to 5 A / dm ^2. Further, it can also be achieved by a method for manufacturing a timepiece pointer for forming an anodic oxide film having fine pores with an average pore diameter of 50 nm to 1000 nm on the surface by electrolysis without spark discharge at a voltage of 1 to 30 V.

  With this configuration, it is possible to eliminate a problem that occurs when magnesium or a magnesium alloy is used as a base material, and it is possible to manufacture a timepiece hand with improved design.

Further, the film-forming stabilizer, acid fluoride, neutral fluoride, silicon oxide, at least one of silicofluoride, phosphates, organic and organometallic compounds, the organic material is hydro key sill group It can also be achieved by a method for producing a timepiece pointer having a chain or cyclic hydrocarbon having at least one of a carboxyl group, a sulfone group, an aldehyde group and an amino group.

  With this configuration, a timepiece having an anodic oxide film having excellent film stability can be manufactured.

  It is possible to solve the problems caused when magnesium or a magnesium alloy is used as a base material, and to provide a timepiece hand with improved design and a manufacturing method thereof.

  Hereinafter, the best mode for carrying out the present invention will be described.

1A and 1B are configuration diagrams of a timepiece using a timepiece pointer according to the present invention, in which FIG. 1A is a front view and FIG. 1B is a cross-sectional view. As shown in FIG. 1, the timepiece 1 includes a pointer 2, a hakama 10, a glass 20, a dial 21, a front frame 31, a rear frame 32, and a movement 50.
The movement 50 is a main part of the timepiece 1 that includes a quartz crystal unit that engraves an accurate frequency, a gear for transmitting power, and the like. The power in the movement 50 is transmitted to the pointer 2 through the drive shaft. Further, the hook 10 has a shaft of the pointer 2 that is rotatably inserted. The glass 20 is attached to the front frame 31 in order to protect the pointer 2 and the dial 21. The inside is sealed by the glass 20 and the dial 21. The rear frame 32 is attached to the front frame 31, and the movement 50 is accommodated in the rear frame 32. On the dial 21, symbols indicating time are arranged at equal intervals along the circumference of the dial 21, and the current time is displayed by numbers or symbols indicated by the hands 2.

The pointer 2 has a base material made of a magnesium alloy and a surface layer made of an anodized film and a plating layer. Since it has the surface layer which consists of an anodic oxide film and a plating layer, while the pointer | guide 2 is excellent in corrosion resistance, it can eliminate the problem which arises when using a magnesium alloy as a base material.

  In addition, since the guide 2 uses a magnesium alloy as a base material, it is excellent in light weight and high rigidity as compared with the case where aluminum is used as a base material. Since it is excellent in light weight and high rigidity, restrictions on the length, width and thickness of the pointer are reduced. Thus, the freedom degree of design can be improved by using a magnesium alloy as a base material.

  FIG. 2 is a comparison diagram between the pointer 2 according to the present invention and the conventional pointer 90. FIG. 2A shows a pointer 2 according to the present invention, and FIG. 2B shows a conventional pointer 90. The conventional pointer 90 uses aluminum as a base material, and as described above, the balancer portion 91 for balancing the weight is formed at the rear end portion of the pointer. The pointer 2 is composed of a hook 10 and a tip portion extending from the hook 10 and indicating the time, and unlike the conventional pointer 90, there is no need to provide a balancer portion for balancing the weight of the pointer. The length from the tip of the pointer 2 and the conventional pointer 90 to the center of the rotation axis of the pointer is 90 mm. While the thickness of the conventional pointer 90 is 0.3 mm, the thickness of the pointer 2 is 0.1 mm.

  Magnesium alloys have a lower specific gravity than aluminum. Therefore, the pointer 2 is excellent in light weight because a magnesium alloy is used for the base material. For this reason, even if the pointer 2 does not have a balance portion for balancing the weight, the pointer can be balanced. Thereby, the freedom degree of design can be improved.

Further, since the magnesium alloy has high rigidity, the thickness of the pointer 2 can be made thinner than the thickness of the conventional pointer 90. As described above, the pointer 2 can be significantly lighter than the conventional pointer 90. Here, the weight of the conventional pointer 90 is 0.12 g, while the weight of the pointer 2 is 0.03 g.
Along with the reduction in the weight of the pointer, it is possible to reduce the power consumption required to drive the pointer and reduce the noise.

  Moreover, the timepiece provided with the hands 2 according to the present invention can improve the design. Specifically, as described above, since the magnesium alloy has high rigidity and excellent wear resistance, the gap between the dial or cover (glass, etc.) and the pointer, or the gap between the pointers can be reduced. It becomes possible. For this reason, the thickness of the timepiece can be reduced, and the design of the timepiece can be improved.

  Further, in the case of a table clock, a wall clock, a timepiece for outdoor installation, and the like, the pointer itself is also long. Therefore, in the case of a conventional aluminum pointer, there is a case where the pointers are in contact with each other and the pointer and the dial are in contact with each other. As a measure for preventing the occurrence of scratches due to this contact, a long distance between the pointers was secured, and the design was restricted. Other preventive measures include attaching a cushioning material such as sponge to the back of the tip of the pointer.

  On the other hand, magnesium or a magnesium alloy has the characteristics of good dent and good damping ability in addition to the characteristics of high rigidity and low specific gravity. As a result, when a magnesium pointer having the same shape and thickness as the aluminum pointer is manufactured, in addition to improving the strength, there are also effects such as less scratching due to contact and reduction of deflection due to vibration. For this reason, the table clock, wall clock, outdoor installation timepiece and the like provided with the hands according to the present invention can reduce the distance between the hands, so that the design can be improved. In addition, workability can be improved and costs can be reduced, such as eliminating the need for a cushioning material on the back surface of the pointer.

  Further, by applying the pointer according to the present invention to a timepiece having a solar battery in the dial, the shadow area of the pointer can be reduced and the power generation efficiency can be improved.

Moreover, the anodic oxide film of the present invention is excellent in corrosion resistance, for protection purposes after plating, rust is not required. For this reason, it is also suitable for a watch using a material which is sealed in a case and may generate a gas that promotes corrosion.

The pointer according to the present invention is particularly suitable for a pointer used in a table clock, a wall clock, or a timepiece for outdoor installation whose length is 80 mm or more.
Of course, the length may be shorter than 80 mm. Moreover, although the thickness of the pointer 2 was 0.1 mm in the examples, it is not limited to this.

Next, the light reflectance of the pointer 2 will be described.
The light reflectance of the surface layer of the pointer 2 is 65% or more when the reflectance is measured at a measurement angle of 85 °. Therefore, even when a magnesium alloy is used as a base material, a good metallic luster can be expressed, visibility can be improved, and a timepiece pointer with improved design can be provided. In order to achieve this level of gloss, the surface of magnesium or a magnesium alloy is subjected to machining polishing, electropolishing, or chemical polishing, or a combination of two or more, and then anodized as described below. It is preferable to apply. Examples of the machining include a method of polishing with a natural or artificial diamond tool at a peripheral speed of 500 to 5000 m / min. As the electrolytic polishing method, there is a method in which alcohol is used as hydrogen peroxide at 15 to 30 ° C., voltage 6 to 20 V, and electrolysis time 2 to 10 minutes. As a chemical polishing method, there is a method of adding a reducing agent with a mineral acid and performing a treatment at 10 to 60 ° C. for 3 to 300 seconds. By performing these pretreatments, the light reflectance is improved to 70% or more.

  Further, the anodic oxide film of the pointer 2 is formed by an anodic oxidation method without spark discharge, and mainly has a structure of a hole, a wall, and a non-porous layer, magnesium hydroxide is 60 to 99.9%, magnesium oxide is It has 0.1 to 40% and has fine pores with an average pore diameter of 50 to 1000 nm.

The anodized film has electrical insulation. Thereby, the timepiece hand having excellent corrosion resistance can be provided. In particular, when a plating layer is further formed on the anodized film, electrical insulation can be ensured between the anodized film and the plated layer, so that the occurrence of potential difference corrosion can be prevented.

Guideline 2 includes 0.1 to 7 mol / L of at least one salt of alkali or alkaline earth metal hydroxide, silicate, silicofluoride and borofluoride, The base material of the pointer 2 made of magnesium or a magnesium alloy is immersed in an electrolytic aqueous solution added with 0.01 to 0.5 mol / L, and this is bath temperature 30 to 80 ° C., current density 0.5 to 5 A / dm. ^2. It is manufactured by forming an anodic oxide film having fine pores with an average pore diameter of 50 nm to 1000 nm on the surface by electrolysis without spark discharge at a voltage of 1 to 30 V.

  With this configuration, it is possible to solve a problem that occurs when magnesium or a magnesium alloy is used as a base material, and it is possible to manufacture a timepiece hand that is excellent in design flexibility.

Specific examples of alkali or alkaline earth metal hydroxides, silicates, silicofluorides, borofluorides, and bifluorides include hydroxides such as NaOH, KOH, Ba (OH) ₂ , Na ₂ SiO ₃ , silicic acid compounds such as Na ₄ SiO ₄ and K ₂ SiO ₂ , silicofluorides such as H ₂ SiF ₆ , Na ₂ SiF ₆ , K ₂ SiF ₆ , CaSiF ₆ , MgSiF ₆ , (NH ₄ ) ₂ SiF ₆ , Examples thereof include borofluorides such as NaBF ₄ , KBF ₄ , and NH ₄ BF ₄ , and bifluorides such as NaF · HF, MgF · HF, and NH ₄ F · HF, and one or more of these are used.

The film-forming stabilizer is added for the purpose of improving the life of the electrolytic solution. Film-forming stabilizer bifluoride, neutral fluoride, silicon oxide, at least one of silicofluoride, phosphoric acid, phosphate, organic and organometallic compounds, the organic material is hydro key sill group A chain or cyclic hydrocarbon having at least one of a carboxyl group, a sulfone group, an aldehyde group and an amino group. Thereby, the manufacturing method of the pointer for timepieces which has an anodic oxide film excellent in film stability can be provided.

Specific examples of the film forming stabilizer include mineral salts such as NaNO ₃ , CaNO ₃ and Na ₂ SO ₄ , fluorides such as KF and NH ₄ F, silicates such as Na ₂ SiO ₃ , and organic compounds. Are polyhydric alcohols such as (CH ₂ OH) ₂ , (CH ₂ CH ₂ OH) O, (CH ₂ OH) ₂ CHOH, and carboxylic acids such as (COOH) ₂ and (CH ₂ CH ₂ COOH) ₂ , Compounds having a sulfone group such as C ₆ H ₄ (SO ₃ H · COOH).

  The formed anodic oxide film has fine pores having an average pore diameter of 50 to 1000 nm, and is mainly composed of a pore, a wall, and a nonporous layer. The thickness of the anodized film is suitably 3 to 20 μm. When the film thickness is 3 μm or less, sufficient corrosion resistance is difficult to obtain, and when it exceeds 20 μm, it is difficult to obtain a sufficient metallic luster.

  The anodic oxide film is formed mainly of magnesium hydroxide, and its composition is 60 to 99.9% magnesium hydroxide, 0.1 to 40% magnesium oxide, and other electrolytes added. It consists of the components of the compound. The non-porous layer is also called a barrier layer and is mainly formed of magnesium hydroxide.

It is preferable to apply dry or wet plating on the anodized film. Examples of dry plating include gold, silver, aluminum, copper, titanium, and chromium. Examples of wet plating include gold, silver, copper, nickel, zinc, and chromium. Examples of dry plating include gold, silver, aluminum, copper, titanium, and chromium plating by vacuum deposition, ion plating, sputtering, and the like, and a method of forming an interference film using silicon dioxide or the like.

In the wet plating , for example, copper strike, copper, nickel, gold, and silver plating are performed after the anodized film, using zinc, palladium, or tin by chemical or substitution reaction as a base. At this time, since there is an anodized film between the magnesium and the base plating , insulation is provided between them. As a result, electrolytic corrosion can be prevented and the original corrosion resistance of plating can be obtained.

  The anodized film is formed so as to be capable of being colored by dyes, pigments or electrolytic coloring. Thereby, even when magnesium or a magnesium alloy is used as a base material, it is possible to improve visibility and provide a timepiece hand with improved design.

  By adopting the anodic oxide film treatment of the present invention as the decorative film, the pointer 2 can obtain the target color by changing the color of the dye used and the treatment time. For this reason, the design can be freely changed without greatly affecting the corrosion resistance and wear resistance. Further, by adopting the anodizing treatment of the present invention, the problems peculiar to magnesium-based materials having poor corrosion resistance can be solved at the same time.

  In addition, the anodic oxide film does not require harmful substances such as chromium in the treatment process. Furthermore, it is suitable for a magnesium material that can be easily removed and easily recycled. For this reason, the anodized film is also suitable for environmentally friendly products.

  Hereinafter, a method for manufacturing a watch hand according to the present invention will be described.

Example 1
First, a magnesium alloy rolled plate (AZ31B) having a thickness of 0.6 mm is pressed into a pointer shape having a width of 1 mm and a length of 10 mm, and the same material is used for measurement. A surface treatment of 30 mm and a length of 50 mm (hereinafter referred to as TP) was carried out with an acid, and then an anodized film treatment was carried out in the next electrolytic solution by an anodizing method without spark discharge. To potassium hydroxide 2 ± 0.5 mol / L, 0.1 ± 0.05 mol / L of diethylene glycol was added as a film formation stabilizer, and 0.01 mol / L of ammonium nitrate was added as a liquid conditioner to obtain an electrolyte. Electrolytic immersion treatment was performed for 20 minutes using a liquid temperature of 65 ± 2 ° C., a current density of 2.0 ± 0.5 A / dm ² , a voltage of 4 V, and a direct current power source, and sealing was performed after pulling up. As a result, an anodized film having a thickness of 6 μm was formed. As a result, a timepiece having a base material made of magnesium and a surface layer made of an anodized film was obtained. Since the anodic oxide film was formed, a watch hand having excellent corrosion resistance was obtained. Moreover, since magnesium is used as a base material, a timepiece pointer having excellent lightness was obtained.

  The light reflectivity of the timepiece hand was 82% when the reflectivity was measured at a measurement angle of 85 °, and a timepiece hand with a glossy and thin beige tone decoration was obtained.

(Example 2)
Next, Example 2 will be described. In the same manner as in Example 1, the magnesium alloy was subjected to an anodic oxidation film treatment by an anodic oxidation method without spark discharge, and after washing with water, a brown dye (SANDOZ: Yellow Brown 2G: 7 g / L, 60 ° C., 15 minutes) After dyeing, sealing treatment was performed in the same manner as in Example 1. As a result, it was 75% when the reflectance was measured at a measurement angle of 85 °, and a watch hand with a glossy brown tone and excellent decorativeness was obtained.

(Example 3)
Next, Example 3 will be described. In the same manner as in Example 1, the magnesium alloy is anodized, palladium as wet plating is used as a base plating by chemical plating, and strike copper plating is performed thereon.
<Composition of plating solution>
Copper cyanide: 25 g / L
Sodium cyanide: 35 g / L
Sodium carbonate: 15 g / L
< Plating conditions>
Liquid temperature: 38 ± 3 ° C
PH: 12-12.6
Current density: 1.2 A / dm ²
3 minutes

Next, a copper plating film having a thickness of 5 μm was formed under the following plating conditions.
<Composition of plating solution>
Copper pyrophosphate: 80 g / L
Metallic copper: 30 g / L
Potassium pyrophosphate: 300 g / L
Ammonia water: 3 ml / L
Potassium nitrate 20g / L
P ratio (P ₂ O _{7 /} Cu): 6.5 to 6.8,
< Plating conditions>
Liquid temperature: 55 ± 2 ° C.
PH: 8.7 ± 0.2
Current density: 2 A / dm ²

Next, a bright nickel plating film having a thickness of 20 μm was formed under the following conditions.
<Composition of plating solution>
Nickel sulfate: 250 g / L
Nickel chloride: 45g / L
Boric acid: 40 g / L
1.5 Sodium naphthalene disulfonate: 10 g / L
1.4 Butynediol: 0.1 g / L
Formalin: 1ml / L
< Plating conditions>
Liquid temperature: 50 ± 2 ° C
PH: 4 ± 0.3
Current density: 4 A / dm ²

Next, a gold plating film having a thickness of 1 ± 0.2 μm was formed under the following conditions.
<Composition of plating solution>
Gold cyanide: 6g / L
EDTA-Copper trisodium: 17 g / L
Sodium dihydrogen phosphate: 60 g / L
Potassium cyanide: 10 g / L
< Plating conditions>
Liquid temperature: 65 ± 2 ° C
PH: 8 ± 0.3
Current density: 0.8 A / dm ²

  As a result, it was 96% when the reflectivity was measured at a measurement angle of 85 °, and a watch hand with a glossy golden decorative property was obtained.

Example 4
Next, Example 4 will be described. In the same manner as in Example 1, there is also a method in which a magnesium alloy is subjected to anodization treatment, and as a dry plating , gold, silver, aluminum, copper, titanium, chromium plating is performed by vacuum deposition, ion plating , sputtering, or the like. . There is also a method of forming an interference film with silicon dioxide or the like.

(Comparative Example 1)
After anodizing with spark discharge using the same electrolyte and electrolysis conditions as in Example 1 (liquid temperature 25 ± 2 ° C., current density 2.0 ± 0.5 A / dm ² , spark discharge) A starting voltage of 48 V and a DC power source was used for 20 minutes), and after sealing, sealing was performed. As a result, a white anodic oxide film having a thickness of 10 μm was obtained. As a result, a timepiece pointer such as a non-glossy white ceramic having a gloss of 38% was obtained when the reflectance was measured at a measurement angle of 85 °.

(Comparative Example 2)
When the non-spark discharge type anodizing treatment with the bath composition of Example 1 was performed at a bath temperature of 25 ° C. ± 1.5 ° C. for 20 minutes by 4 V constant voltage electrolysis, the current was 0.3 to 0.4 A / dm 2, It was a light gray color tone with a film thickness of 3 μm and a glossiness of 53%, making it unsuitable for use as a watch pointer.

(Comparative Example 3)
When the bath temperature was 85 ° C. ± 1.5 ° C. and the 4V constant voltage electrolysis treatment was performed for 20 minutes with the bath composition of Example 1, the current was 0.3 to 2.6 A / dm 2 and the film thickness was 10 μm. It was gray and had a glossiness of 32%, which was unsuitable for use as a watch hand.

(analysis)
Table 1 shows the reflectance of the timepiece hands of Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3.

  As shown in Table 1, the timepiece hands of Examples 1, 2 and 3 have a significantly increased reflectance compared to the timepiece hands of Comparative Example 1, Comparative Example 2 and Comparative Example 3. is doing. As described above, even when magnesium or a magnesium alloy is used as a base material, a good metallic luster can be exhibited, and a timepiece pointer having excellent visibility and improved design is obtained.

The preferred embodiment of the present invention has been described in detail above, but the present invention is not limited to the specific embodiment, and various modifications can be made within the scope of the gist of the present invention described in the claims.・ Change is possible.
The best mode for carrying out the invention has been described by taking as an example a timepiece hand having a base material made of a magnesium alloy and a surface layer made of an anodized film and a plating layer, but is limited to such a configuration. Instead, it may be a timepiece pointer having a base material made of magnesium and an anodized film, or a surface layer made of an anodized film and a plating layer.

It is a block diagram of the timepiece using the timepiece pointer according to the present invention. It is a comparison figure with the guideline which concerns on this invention, and the conventional guideline. It is a front view of the conventional timepiece.

Explanation of symbols

1 Clock 2 Pointer 10 Hakama 20 Glass 21 Dial 31 Front Frame 32 Rear Frame 50 Movement

Claims (10)

A substrate made of magnesium or a magnesium alloy;
Anodic oxide film, or a watch guidelines possess a surface layer consisting of the anodized film and the plated layer,
The overall length is 80 mm or more,
Guidance for a timepiece, characterized in that no balancer unit provided for balancing the weight of the pointer for the clock extending in opposite directions relative to body portion indicating the current time extending in a predetermined direction. 2. The timepiece handpiece according to claim 1, wherein the light reflectance of the surface layer is 65% or more when the reflectance is measured at a measurement angle of 85 °. The anodic oxide film is formed by an anodic oxidation method without spark discharge, and contains 60-99.9% magnesium hydroxide, 0.1-40% magnesium oxide, and fine pores having an average pore diameter of 50-1000 nm. The timepiece handpiece according to claim 1 or 2, characterized by comprising: The timepiece pointer according to any one of claims 1 to 3, wherein the anodized film is formed so as to be colored by a dye, a pigment, or electrolytic coloring. The timepiece hand according to claim 1, wherein the anodized film has an electrical insulating property. 6. The timepiece hand according to claim 1, wherein the timepiece hand is composed of a hook part and a tip part extending from the hook part and indicating a time. A timepiece comprising the timepiece handpiece according to any one of claims 1 to 6. The timepiece according to claim 7, wherein the timepiece is a table clock, a wall clock, or an outdoor timepiece. While containing 0.1-7 mol / L of at least one salt among alkali or alkaline earth metal hydroxide, silicate, silicofluoride and borofluoride, the film-forming stabilizer is 0.01- A watch pointer base material made of magnesium or a magnesium alloy is immersed in an aqueous electrolytic solution to which 0.5 mol / L is added, and this is bath temperature 30 to 80 ° C., current density 0.5 to 5 A / dm ² , voltage by electrolysis without spark discharge at 1～30V, a manufacturing method of the pointer for a timepiece of forming an anodic oxide film having micropores with an average pore diameter of 50nm~1000nm the surface,
The overall length of the watch hands is 80 mm or more,
Production of a watch hand, characterized in that no balancer portion is provided for balancing the weight of the watch hand extending in the opposite direction with respect to the main body portion extending in a predetermined direction for indicating the current time. Way . The film-forming stabilizer, acid fluoride, neutral fluoride, silicon oxide, at least one of silicofluoride, phosphates, organic and organometallic compounds, the organic material is hydro key sill group, carboxyl The method for producing a timepiece handpiece according to claim 9, wherein a chain-like or cyclic hydrocarbon having at least one of a group, a sulfone group, an aldehyde group and an amino group is retained.

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