JP2021025932A - Timepiece component, movement, and timepiece - Google Patents

Abstract

To provide timepiece components which are made of a resin material to neutralize generated electrical charge and thus prevent themselves from being electrically charged, and to provide a movement and a timepiece.SOLUTION: Timepiece components (a resin gear 91, train wheel bearing 94, and base plate 21) constituting a timepiece 10 are provided, each being made of a resin material and comprising an α-ray source of 1.0 kBq or greater and less than 3.7 kBq.SELECTED DRAWING: Figure 5

Description

The present invention relates to watch parts, movements, and watches.

Conventionally, for example, a clock having a built-in battery and notifying the time by rotating a pointer such as a second hand by the electric power of the battery is known (see, for example, Patent Document 1). The movement of this watch has a drive mechanism for driving a pointer and a drive motor. The drive mechanism has, for example, a first gear that meshes with the gear of the drive motor and a second gear to which the pointer is fixed. The rotational force of the drive motor is transmitted to the second gear via the first gear. As a result, the pointer rotates.

The first gear is made of a resin material, which is a relatively lightweight material, in order to suppress the moment of inertia. On the other hand, since the needle is fixed, the second gear is made of a metal material having sufficient strength. Further, the drive mechanism is configured to hold the positions of the gears by the main plate and the train wheel receiver that hold the shafts of the first gear and the second gear from both sides, respectively. Further, the first gear and the second gear are thin, and the distance between the main plate and the train wheel receiver is also narrow. The main plate and the train wheel receiver are made of a resin material, which is a relatively lightweight material.

In such a drive mechanism, when the first gear made of a resin material and the second gear made of a metal material mesh with each other and rotate together, the teeth of both gears are rubbed against each other or meshed with each other. When the teeth are separated from each other, static electricity is generated in the first gear and the second gear. When such a phenomenon occurs, the main plate and train wheel receiver near the side surface of the gear are likely to be polarized due to the electric charge accumulated in the gear, and in particular, each gear is caused by the Coulomb force generated between the train wheel receiver and the close distance. Sticks to the train wheel holder and the frictional resistance increases significantly. In such a state, the motor may stop.

Therefore, in order to suppress such a problem, for example, a timepiece component described in Patent Document 2 has been proposed. This watch component mixes carbon fiber in the resin material, reduces the electric resistance, discharges the electric charge accumulated in the drive mechanism to prevent the electric charge, and tries to suppress the stop of the motor due to the rotational operation.

By the way, in order to discharge the electric charge of the drive mechanism, it is important that the electric resistance of the resin material is low. Therefore, conventionally, in order to reduce the electrical resistance of the resin material, for example, the technique described in Patent Document 2 is disclosed. In the apparatus described in Patent Document 2, carbon fibers are mixed in the resin material of the gear, and needle-shaped fibers of calcium silicate or potassium titanate are mixed in order to maintain the strength of the gear tooth tips where the carbon fibers do not easily enter. ing.

Japanese Unexamined Patent Publication No. 2006-337127 Japanese Unexamined Patent Publication No. 3-081370

However, in Patent Document 2, in order to reduce the electric resistance in the resin material with carbon fibers, carbon nanotubes, etc., which are general carbon fillers, specifically, a relatively long carbon filler having a length of 70 to 200 μm or more is used. Need to be used. The carbon filler of this length does not penetrate into small tooth tips of 0.3 mm or less. Further, with a thin gear, there is a problem that the filler is easily clogged at the root of the tooth and the tooth tip cannot be formed. Further, the substance mainly filled in the tooth tip has a high volume resistivity, and when it is dispersed in the resin material, sufficient conductivity may not be obtained and the antistatic effect of the gear may not be sufficiently exhibited. is there. Therefore, it is an issue to prevent electrification when a resin material is used for a timepiece component.

The timepiece part is a timepiece part constituting the timepiece, and the timepiece part is characterized by including a resin material and an α radiation source of 1.0 kBq or more and less than 3.7 kBq. And.

In the above-mentioned timepiece parts, the resin material is preferably a polymer material, and the α-radioactive source is preferably any one of Am241 and Ra226.

The watch component is preferably any of a gear that transmits a driving force, a train wheel receiver that supports the gear, and a main plate.

The movement is characterized by including the above-mentioned timepiece parts and a motor driven by the electric power of a power source.

The timepiece is characterized by including the above-mentioned movement, the power source, a pointer indicating a current situation including a time, and a casing for accommodating the movement.

Front view of the clock according to the embodiment. Schematic cross-sectional view of the watch. Top view showing the movement of the watch. An enlarged cross-sectional view showing the movement of the watch. The plan view which shows the drive mechanism which a clock has.

1. 1. The first embodiment is a front view of the clock 10 according to the present embodiment. FIG. 2 is a schematic cross-sectional view of the clock 10. FIG. 3 is a plan view showing the movement 2 included in the timepiece 10. Note that FIG. 3 is a plan view of the movement 2 as viewed from the back side. Further, in FIG. 3, the illustration of each train wheel receiver is omitted.

FIG. 4 is an enlarged cross-sectional view showing the movement 2 included in the timepiece 10. Note that FIG. 4 is a cross-sectional view taken along the line AA of the drive mechanism 22 shown in FIG. Further, since FIG. 4 is shown upside down, the front side of the clock 10 is the lower side of the drawing, and the back side of the clock 10 is the upper side of the drawing. FIG. 5 is a plan view showing the drive mechanism 22 included in the clock 10. In detail, FIG. 5 is a plan view of the drive mechanism 22A in FIG. 3 as viewed from the back side.

Hereinafter, embodiments of the timepiece parts, movements, and timepieces of the present invention will be described with reference to FIGS. 1 to 5. Further, the dial 3 side is also referred to as "upper side" or "front side", and the back cover 13 side is also referred to as "lower side" or "back side".

As shown in FIGS. 1 and 2, the timepiece 10 is a timepiece including a housing 1, a movement 2, a dial 3, and a power generation means 4. Further, a pair of belts 7 are provided on the outer edge of the housing 1 and can be worn on the arm.

The housing 1 includes an outer case 11, a cover glass 12, and a back cover 13. In the outer case 11, for example, a bezel 112 made of ceramic is fitted to a cylindrical case 111 made of metal. A dial 3 is arranged as a time display portion on the inner peripheral portion of the bezel 112.

The movement 2 includes a main plate 21, a drive mechanism 22 supported by the main plate 21, a circuit board 23, and a train wheel receiving 94 (see FIG. 4).
The main plate 21 has a function of supporting the drive mechanism 22 and the like. Further, the main plate 21 is attached to a support member 6 described later.
The drive mechanism 22 is mainly attached to the lower surface (back cover 13 side) of the main plate 21. The drive mechanism 22 will be described in detail later.

As shown in FIG. 2, the circuit board 23 covers the back side of the drive mechanism 22. Further, the circuit board 23 includes a receiving unit (GPS module) 235, a control unit 236, and a battery 237. The battery 237 is composed of a secondary battery such as a lithium ion battery, a silver oxide battery, or the like. In the present embodiment, the battery 237 is charged with the electric power generated by the solar cell 5 described later. Further, the circuit board 23 is connected to an antenna or the like (not shown) via a connection pin. Further, the circuit board 23 is covered from the back side by a circuit retainer 25 having conductivity.

As shown in FIG. 1, the dial 3 has a time display unit 31, a calendar display unit 32, a day of the week display unit 33, a multi-indicator 34, and a dual time display unit 35.

A pointer shaft 41 is inserted through the time display unit 31. Further, the pointer shaft 41 has, for example, a triple cylinder structure provided concentrically, and the second hand 411, the minute hand 412, and the hour hand 413 are independent of each other on each shaft. It is fixed to rotate.

The calendar display unit 32 has a function of notifying the date by displaying a part of the calendar car 42 on which the numbers from 1 to 31 are printed through the window unit 321 provided on the dial 3.
The day of the week display unit 33 has a function of notifying the day of the week by the position pointed by the needle 431 fixed to the pointer shaft 43 through which the pointer shaft 43 is inserted.

The multi-indicator 34 has a function of notifying, for example, the remaining power of the battery 237 by the position pointed by the needle 441 fixed to the pointer shaft 44 through which the pointer shaft 44 is inserted.
A pointer shaft 45 is inserted through the dual time display unit 35, and has a function of notifying, for example, the time of another country by a position pointed to by a hand 451 fixed to the pointer shaft 45.

As shown in FIGS. 3 to 5, the pointer shaft 41 of the time display unit 31 is driven by the drive mechanism 22A and the drive mechanism 22B, which will be described later. Specifically, the needle 411 is driven by the drive mechanism 22A, and the needle 412 and the needle 413 are driven by the drive mechanism 22B.

The calendar car 42 of the calendar display unit 32 is driven by a drive mechanism 22C described later. The pointer shaft 43 of the day of the week display unit 33 is driven by the drive mechanism 22D described later. The pointer shaft 44 of the multi-indicator 34 is driven by a drive mechanism 22E described later. The pointer shaft 45 of the dual time display unit 35 is driven by a drive mechanism 22F described later (see FIG. 3).

The dial 3 has good light transmission in a wavelength range effective for the spectral sensitivity of the solar cell 5, and is transparent, for example. The constituent material is not particularly limited, and examples thereof include various glass materials and various plastic materials. In particular, a plastic material is preferable from the viewpoint of light weight and ease of processing, and polycarbonate is particularly preferable. The clock 10 of the present embodiment is an electronic clock, and when the light transmitted through the dial 3 reaches the solar cell 5, electric power is generated as described above.

As shown in FIG. 2, the power generation means 4 includes a solar cell 5 and a support member 6. The solar cell 5 has a function of converting light energy into electric energy. The electric energy converted by the solar cell 5 is used for driving the movement 2 and the like. An electrode (not shown) is formed in the solar cell 5, and the electric power generated by the solar cell 5 is supplied to the battery 237 via the wiring connected to the electrode.

As shown in FIG. 2, the support member 6 is arranged on the outer peripheral side of the main plate 21 and on the back surface side of the dial 3. Further, the support member 6 is composed of a frame-shaped member, and is fixed to the solar cell 5 and the dial 3 by a fixing means (not shown). The support member 6 is fixed to the main plate 21 while supporting the dial 3 and the solar cell 5.

As shown in FIG. 3, the drive mechanism 22 includes a drive mechanism 22A and a drive mechanism 22B for driving the pointer shaft 41, a drive mechanism 22C for driving the calendar wheel 42, a drive mechanism 22D for driving the pointer shaft 43, and a pointer. It has a drive mechanism 22E for driving the shaft 44 and a drive mechanism 22F for driving the pointer shaft 45.

Since these have substantially the same configurations, the drive mechanism 22A (the portion surrounded by the broken line in FIG. 3) will be described in detail below.

In detail, FIG. 4 is a cross-sectional view showing the vicinity of the drive mechanism 22A including the drive mechanism 22A. As shown in FIGS. 4 and 5, the drive mechanism 22A includes a motor 8 driven by the electric power of the battery 237 as a power source, and a train wheel unit 9 driven by the motor 8.

As shown in FIG. 5, the motor 8 is a stepping motor, and is joined to a stator 84 having a rotor accommodating hole 85, a rotor 82 rotatably arranged in the rotor accommodating hole 85, and a stator 84. It includes a magnetic core and a coil 83 wound around the magnetic core. Further, the rotor 82 includes a rotor gear 81.

The rotor gear 81 is made of, for example, a metal material and has teeth 811 on its outer peripheral portion. As shown in FIG. 5, the teeth 811 mesh with the teeth 911 of the resin gear 91 as a gear. As a result, the rotational force of the motor 8 is transmitted to the resin gear 91 via the rotor gear 81 of the rotor 82.

Further, the coil 83 in the motor 8 has terminals at both ends. Each terminal is electrically connected to the control unit 236. The rotor 82 is magnetized in two poles (S pole and N pole). The stator 84 is made of a magnetic material. When a drive pulse is supplied from the control unit 236 between the terminals at both ends of the coil 83 and a current flows, magnetic flux is generated in the stator 84. As a result, the rotor 82 rotates by one step (180 degrees) due to the interaction between the magnetic poles generated in the stator 84 and the magnetic poles of the rotor 82.

The train wheel unit 9 has a resin gear 91 (reduction gear) that meshes with the rotor gear 81, a metal gear 93 to which the needle 411 is fixed and meshes with the resin gear 91, and a train wheel receiver 94 that supports them. The resin gear 91 and the metal gear 93 are arranged side by side in this order from the driving side. The reduction ratio of the train wheel unit 9 varies depending on the drive mechanisms 22A to 22F, but is about 5 or more and 100 or less.

As shown in FIGS. 4 and 5, the resin gear 91 as a gear has a large gear 910 and a small gear 912 (kana) fixed to the center of one surface of the large gear 910 and rotating coaxially. In this embodiment, the large gear 910 and the small gear 912 are integrally formed.

The large gear 910 has a gear body 910A and a coating layer 900. The gear body 910A has a disk shape and has teeth 911 on the outer peripheral portion thereof. The teeth 911 mesh with the teeth 811 of the rotor gear 81. As a result, the rotational force of the rotor gear 81 is transmitted to the resin gear 91.

The small gear 912 (kana) has a gear body 912A and a coating layer 900. The gear body 912A has a disc shape and has teeth 913 on the outer peripheral portion thereof. The small gear 912 meshes with the metal gear 93.

A polymer material is used as the resin material constituting the gear body 910A and the gear body 912A. Specifically, polyacetal, polycarbonate, polyamide, polyarylate, polyetherimide, acrylonitrile, butadiene, styrene copolymer, etc. Can be mentioned.

The metal gear 93 has a disc shape and has teeth 931 on the outer peripheral portion thereof. The tooth 931 meshes with the tooth 913 of the small gear 912. As a result, the rotational force of the resin gear 91 is transmitted to the metal gear 93. A needle 411 is fixed to the center of the top surface of the metal gear 93. As a result, the needle 411 rotates with the rotation of the metal gear 93. As shown in FIG. 4, such a resin gear 91 and a metal gear 93 are sandwiched between the main plate 21 and the train wheel receiver 94.

Further, as shown in FIG. 4, a connecting means 96 is provided between the train wheel receiving 94 and the circuit board 23. In this embodiment, the connecting means 96 is made of a long leaf spring having conductivity. One end of the connecting means 96 (the left end in FIG. 4) is in contact with the shaft end on the back surface side of the dial 3 of the pointer shaft 41, and the pointer shaft 41 is urged in the axial direction. There is. Further, in the connecting means 96, the other end portion (the end portion on the right side in FIG. 4) is in contact with the circuit board 23. Further, the circuit board 23 is electrically connected to the positive electrode or the negative electrode of the battery 237. Therefore, the metal gear 93 is electrically connected to the positive electrode or the negative electrode of the battery 237 via the connecting means 96 and the circuit board 23. The battery 237 has a sufficiently large capacitance against static electricity generated in the resin gear 91 and the metal gear 93.

According to the train wheel unit 9 as described above, the rotational force of the motor 8 is transmitted to the needle 411 via the train wheel unit 9. Since the resin gear 91 is made of a resin material, the weight of the resin gear 91 can be reduced and the moment of inertia of the resin gear 91 can be suppressed. On the other hand, since the metal gear 93 is made of a metal material, the strength of the metal gear 93 can be increased. Therefore, it is possible to prevent damage even if the torque generated by the rotation of the needle 411 is received.

By the way, as in the conventional case, in a configuration in which a gear made of only a resin material and a gear made of a metal material mesh with each other and rotate together, static electricity is generated in both gears due to friction and peeling, and electric charges are accumulated. To. As is known from the charging train, the gear made of resin material is charged to the negative electrode, and the gear made of metal material is charged to the positive electrode.

Further, when the train wheel receiver facing both gears is composed of only a resin material as in the conventional case, dielectric polarization is caused by an electric field from the electric charge of both gears, and Coulomb is provided between both gears and the train wheel receiver 94. Power is generated. Further, since the potentials of the adjacent gears are different, a gradient force is also generated, and the gears move along the axial direction, so that the gears and the train wheel receiver 94 stick to each other. As a result, frictional resistance is generated in both gears, which causes a problem that the rotation of both gears is hindered.

Further, when the train wheel receiver is made of a conductive material and the train wheel receiver is not grounded, the Johnson Rabeck force is generated by adjacent gears having different potentials. Further, even if the train wheel receiver is made of a conductive material and the train wheel receiver is grounded, a mirror image charge of the electric charge on the side surface of both gears is generated in the train wheel receiver, which corresponds to the Coulomb force. Force is generated. That is, in either case, a force acts in the direction in which the gears move along the axial direction, the gears and the train wheel receiver stick to each other, causing frictional resistance, which causes a problem that the rotation of each gear is hindered.

Therefore, in the present embodiment, the above-mentioned problems are solved by adopting the following configuration. This will be described below.

In the present embodiment, the resin gear 91 is formed of a material obtained by kneading a source material with a resin material. In other words, the resin gear 91, which is a component for a timepiece, is composed of a resin material and a radiation source material. Specifically, a polyacetal resin, which is a polymer material, is used as the resin material. The polymer material such as polyacetal resin has excellent mechanical strength, good wear resistance and slidability, and good dimensional stability.

As a radiation source material to be kneaded into a resin material, an α radiation source having a high ratio of α rays is used. As a substance that can be mainly used as an α-ray source, Am241 (americium), Ra226 (radium), Th232 (thorium), Pm147 (promethium) and the like can be mentioned.

Among the above-mentioned radiation source substances, in this embodiment, two α radiation sources of Am241 (americium) and Ra226 (radium) can be adopted. The reason for adoption is that Am241 (americium) and Ra226 (radium) need only a small amount of weight, 7.8 ng and 27 ng, respectively, to achieve 1.0 kHz specified as the lower limit of α rays. .. Further, Am241 (americium) and Ra226 (radium) have a long half-life of 433 years and 1600 years, which is a period for emitting α rays.

Since the weight of the resin gear 91 of Th232 (thorium), which is the source material, is 0.1 g, the weight required to satisfy the lower limit of α rays of 1.0 kBq is 0.22 g. The resin gear 91 of the form cannot be kneaded and used. In addition, Pm147 (promethium) has a so-called half-life, which is the period during which α rays are continuously generated, which is as short as 2.6 years, compared to about 5 to 10 years for general watches, making it a watch part. Do not use because it is not suitable for.

In this embodiment, Ra226 (radium), which has a relatively low radioactivity and a larger required weight, is adopted from two types, Am241 (americium) and Ra226 (radium).

The Law Concerning Prevention of Radiation Hazards prohibits radiation doses of 3.7 kBq or more generated by those that are not sealed. Therefore, in the present embodiment, the radioactivity of α rays to be kneaded into the resin material is defined as a range of 1.0 kBq or more and less than 3.7 kBq. In Ra226 (radium), when the above regulation is taken into consideration, it is used so as to be 27 ng or more and less than 100 ng.

The resin gear 91 is manufactured by using injection molding. The material for molding is a thermoplastic polymer resin obtained by heating Ra226 (radium) powdered as an insoluble inorganic salt so that the radioactivity of α rays is 1.0 kBq or more and less than 3.7 kBq. In the embodiment, a product kneaded with polyacetal and pelletized is used. In addition, a radium salt or radium oxide may be mixed with silicate glass to form fine beads, kneaded with a thermoplastic polymer resin, and pelletized.

Then, the polymer resin obtained by kneading the above-mentioned Ra226 (radium) is injection-molded by the mold of the resin gear 91 to form the resin. The resin gear 91 to which the above-mentioned Ra226 (radium) is applied is similarly applied not only to the resin gear 91 but also to the resin gears used in the drive mechanism 22B to the drive mechanism 22F.

In this embodiment, not only the resin gear 91 but also the train wheel receiver 94 and the main plate 21 are provided with Ra226 (radium) of 27 ng or more so that the radioactivity of α rays is 1.0 kBq or more and less than 3.7 kBq. , Molded using a resin kneaded with less than 100 ng. In that case, poniphenylene sulfide is used as the polymer resin material used for the train wheel receiver 94 and the main plate 21. Since poniphenylene sulfide contains glass fiber, it is possible to secure the strength required for the train wheel receiver 94 and the main plate 21.

Conventionally, when a gear made of a resin material and a gear made of a metal material inside the drive mechanism of a movement mesh with each other and rotate together, the teeth of both gears are rubbed against each other or meshed with each other. When the teeth are separated from each other, static electricity is generated between the gears and an electric charge is generated. However, according to the present embodiment, the resin gear 91, the train wheel receiver 94 supporting the resin gear 91, and the main plate 21 include the resin material and the α-ray source, so that the resin gear 91 and the metal gear 93 are generated. The charged charge can be neutralized, and the charge inside the drive mechanism 22 can be prevented.

Further, conventionally, there has been a problem that the resin gear is attracted to the train wheel receiver due to the electric charge generated inside the drive mechanism, the frictional resistance increases, and the operation is stopped. However, according to the present embodiment, it is possible to prevent the inside of the drive mechanism 22 of the movement 2 from being charged, thereby preventing a problem that the operation of the drive mechanism 22 is stopped.

Regarding the standard for using radiation, the α ray used in this embodiment has a stronger ionizing action than the β ray and the γ ray, and has a low transmittance. Alpha rays can be blocked by a piece of paper with a thickness of 100 μm or a layer of air with a thickness of several cm. Therefore, in the present embodiment, the α ray is sealed inside the watch 10 by casing the movement 2 in which the resin gear 91 using the α ray, the train wheel receiver 94, and the main plate 21 are incorporated in the housing 1. Because it can be done, it does not affect the human body.

Conventionally, even if a conductive resin material is used, carbon fibers do not reach the tooth tips of gears and the surface of the train wheel receiving, and sufficient conductivity cannot be obtained, so that the antistatic effect may not be exhibited. .. However, by using alpha rays, even if there is no electrical connection, if the alpha ray source is contained in the resin gear, train wheel receiver, and main plate, it is necessary to pay attention to whether the carbon fiber has reached the required place. By neutralizing the electric charge with α rays, it is possible to prevent the electric charge and solve the problem of the motor stopping due to the rotational movement.

Since the clock 10 of the present embodiment uses the movement 2 for preventing static electricity, it is possible to prevent the pointer indicating the time and radio wave reception status using the drive mechanism 22 from stopping, which is caused by static electricity. It is possible to realize a clock that does not cause problems such as operation stoppage. In this embodiment, the needles 411,421,413,431,441,451 correspond to the pointers.

The contents derived from the embodiment are described below.

The timepiece part is a timepiece part constituting the timepiece, and the timepiece part is characterized by including a resin material and an α radiation source of 1.0 kBq or more and less than 3.7 kBq. And.

According to this configuration, the timepiece component includes a resin material and an α-ray source of 1.0 kBq or more and less than 3.7 kBq, so that α-rays can be generated from the timepiece part. Therefore, due to the ionizing action of α rays, it is possible to neutralize the electric charge including static electricity generated by friction between watch parts. Therefore, it is possible to prevent electrification when a resin material is used for the timepiece component.

In the above-mentioned timepiece parts, the resin material is preferably a polymer material, and the α-radioactive source is preferably any one of Am241 and Ra226.

Am241 (Americium) and Ra226 (Radium) need only a small amount of weight to achieve 1.0 kHz specified as the lower limit of alpha rays, and Am241 (Americium) and Ra226 (Radium) are The so-called half-life, which is the period during which α rays are emitted, is 10 years or more, which is necessary for the period of use of the watch, and is suitable as an α ray source used for watch parts. Further, by using a polymer material as the resin material, it is possible to have mechanical strength, abrasion resistance, good slidability and the like required for watch parts.

The watch component is preferably any of a gear that transmits a driving force, a train wheel receiver that supports the gear, and a main plate.

According to this configuration, by using the above-mentioned resin material and α-ray source for any of the gear, train wheel receiver, and main plate as the timepiece parts, it is possible to prevent charging when the resin material is used for the timepiece parts. can do. As a result, it is possible to prevent the conventional problem that the rotation of the gear is hindered.

The movement is characterized by including the above-mentioned timepiece parts and a motor driven by the electric power of a power source.

According to this configuration, in the movement including the above-mentioned timepiece parts and the motor, it is possible to prevent the timepiece parts from being charged, so that the movement that prevents the charge can be realized.

The timepiece is characterized by including the above-mentioned movement, the power source, a pointer indicating a current situation including a time, and a casing for accommodating the movement.

According to this configuration, since the movement is provided to prevent the parts of the timepiece from being charged, the timepiece can accurately indicate the current situation including the time by the pointer. In addition, by storing the movement in a casing, α rays can be sealed inside the watch. Therefore, an accurate clock can be realized.

1 ... Housing as a casing, 2 ... Movement, 5 ... Solar cell that supplies power to the battery, 8 ... Motor, 9 ... Wheel train unit, 10 ... Clock, 21 ... Main plate, 22 ... Drive mechanism, 91 ... Resin gear , 93 ... Metal gear, 94 ... Wheel train receiver, 237 ... Battery as power supply, 411, 421, 413, 431, 441, 451 ... Needle as pointer, 910 ... Large gear constituting resin gear, 910A ... Gear body , 912 ... Small gears constituting the resin gear, 912A ... Gear body.

Claims (5)

It is a watch component that makes up a watch.
The watch parts
A timepiece component characterized by including a resin material and an α radiation source of 1.0 kBq or more and less than 3.7 kBq. The watch component according to claim 1.
The resin material is a polymer material and
A timepiece component characterized in that the α-ray source is any one of Am241 and Ra226. The watch component according to claim 1 or 2.
The timepiece part is any one of a gear that transmits a driving force, a train wheel receiver that supports the gear, and a main plate. The watch parts according to claim 3 and
A movement characterized by having a motor driven by the power of a power source. The movement according to claim 4 and
With the power supply
A guideline that points to the current situation, including the time,
A timepiece including a casing for accommodating the movement.

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