JP7167672B2 - movements and watches - Google Patents

Description

The present invention relates to movements and timepieces.

For example, there is known a timepiece that has a built-in battery and reports the time by rotating a pointer such as a second hand with the electric power of the battery. The movement of this timepiece has a train wheel unit that drives hands and a drive motor. The train wheel unit has, for example, a first gear that meshes with the gear of the drive motor and a second gear to which a pointer is fixed. Rotational force of the drive motor is transmitted to the second gear via the first gear. This causes the pointer to rotate.

The first gear is made of resin material, which is a relatively lightweight material, in order to suppress its moment of inertia. On the other hand, the second gear is made of metal material, which is a material with sufficient strength, since the needle is fixed. Further, the train wheel unit is configured to hold the positions of the gears by a main plate and a train wheel bridge that hold the shafts of the first gear and the second gear from both sides, respectively.

Furthermore, the first gear and the second gear are thin, and the distance between the main plate and the train wheel bridge is also short. The main plate and train wheel bridge are made of a resin material, which is a relatively lightweight material.

In such a train wheel unit, when the first gear made of a resin material and the second gear made of a metal material are meshed and rotated together, friction between the teeth of both gears may occur. Static electricity is generated in the first gear and the second gear when the teeth are separated from each other. When such a phenomenon occurs, the electric charge accumulated in the gears tends to polarize the main plate and train wheel bridge near the side of the gear. sticks to the train wheel bridge and the frictional resistance increases significantly. Then, depending on the degree, there is a problem that the motor stops.

It is important for the resin material to have a low electric resistance in order to discharge the electric charges of the train wheel unit. Therefore, conventionally, for example, a technique described in Patent Document 1 has been proposed in order to reduce the electrical resistance of a resin material. In the device described in Patent Document 1, carbon fiber is mixed in the resin material of the gear. Further, Patent Document 2 proposes a technique using a substrate made of a resin material and a gear in which carbon fiber and boron are mixed in the resin material.

JP-A-3-081370 WO2003/54636

However, the carbon fibers described in Patent Literature 1 and Patent Literature 2 do not penetrate to the tooth tip of the gear, so there is a problem that sufficient conductivity cannot be obtained.

SUMMARY OF THE INVENTION An object of the present invention is to provide a movement and a timepiece that can ensure sufficient electrical conductivity up to the tips of teeth.

A movement according to the present invention includes a motor driven by electric power of a battery, a first gear that transmits the driving force of the motor and is made of a material containing a conductive polymer and carbon powder, and the driving force of the motor. and a second gear made of a metal material.

According to such a configuration, even if the first gear is thin and small, the powdered carbon and the conductive polymer are filled up to all tooth tips, and the conductivity of the first gear can be effectively secured. can. In addition, static electricity due to friction generated when the first gear and the second gear mesh and rotate together can be effectively suppressed. Then, the first gear and the second gear, for example, the drive motor power supply electrode (positive or negative electrode), the exterior case, etc., having a sufficiently large electrostatic capacity against the static electricity generated in the first gear and the second gear By electrically connecting with the structure, static electricity generated by separation of the first gear and the second gear can be discharged.

The movement of the present invention preferably has an electrically conductive train wheel bridge that supports the first gear and the second gear.

As a result, the train wheel bridge, the first gear, and the second gear can be brought to the same potential. Therefore, it is possible to prevent not only the Coulomb force but also the Johnson-Rahbek force and the gradient force from being generated between the first gear, the second gear and the train wheel bridge. As a result, it is possible to more effectively prevent problems such as stopping of the motor that drives the first gear and the second gear.

The movement of the present invention preferably has a conductive main plate supporting the first gear and the second gear.

As a result, the train wheel bridge, the first gear, and the second gear can be brought to the same potential. Therefore, it is possible to prevent not only the Coulomb force but also the Johnson-Rahbek force and the gradient force from being generated between the first gear, the second gear and the train wheel bridge. As a result, it is possible to more effectively prevent problems such as stopping of the motor that drives the first gear and the second gear.

In the movement of the present invention, the conductive polymer is preferably at least one selected from the group consisting of polythiophene, polyacetylene, polyaniline, polyparaphenylene and polyparaphenylenevinylene, doped with impurities.

Thereby, the first gear is excellent in wear resistance and impact resistance while sufficiently ensuring electrical conductivity.

In the movement of the present invention, the content of the conductive polymer in the first gear is preferably 90 wt % or more and 99.9 wt % or less.

As a result, sufficient strength of the first gear can be ensured while sufficiently ensuring electrical conductivity.

In the movement of the present invention, the carbon powder preferably has an average particle size of 1 μm or more and 50 μm or less.

As a result, sufficient strength of the first gear can be ensured while sufficient conductivity is ensured, and moldability can be further improved.

In the movement of the present invention, the content of the carbon powder in the first gear is preferably 0.1 wt % or more and 10 wt % or less.

As a result, sufficient strength of the first gear can be ensured while sufficiently ensuring electrical conductivity.

In the movement of the present invention, the first gear preferably meshes with the second gear.

When the first gear and the second gear mesh, static electricity is likely to occur in the first gear, but even in this case, the effects of the present invention are exhibited more effectively.

In the movement of the present invention, the first gear preferably meshes with a gear fixed to the rotating shaft of the motor.

As a result, the weight of the first gear can be reduced, and the moment of inertia of the first gear can be suppressed.

The movement of the present invention may have a plurality of said first gears that mesh with each other.

If the movement has a plurality of conductive first gears, the plurality of first gears can be discharged by connecting one of the plurality of first gears with a ground electrode. .

In the movement of the present invention, it is preferable that the second gear is located on the driven side of the first gear.

In such a configuration, the second gear is more susceptible to torque than the first gear, but since it is made of a metal material, it has high strength and excellent durability.

In the movement of the present invention, it is preferable that a second hand is fixed to the second gear.

In the train wheel unit that drives the second hand, the rotational speed of each gear is relatively high, and static electricity is likely to accumulate, so the effects of the present invention are more effectively exhibited.

The train wheel unit is a train wheel unit in which a first gear made of a resin material and a second gear made of a metal material mesh and rotate together, and the first gear is made of a conductive polymer. It is made of a material containing carbon powder, and is characterized by transmitting the driving force of a motor driven by a battery as a power source.
As a result, a wheel train unit that exhibits the effects described above can be obtained.

A timepiece of the present invention is characterized by comprising the movement of the present invention and a casing housing the movement.
As a result, a timepiece exhibiting the above effects can be obtained.

1 is a front view of the timepiece of the first embodiment; FIG. 2 is a sectional view of the timepiece shown in FIG. 1; FIG. FIG. 2 is a plan view of a movement included in the timepiece shown in FIG. 1; 2 is an enlarged cross-sectional view of a movement included in the timepiece shown in FIG. 1; FIG. FIG. 4 is a schematic diagram (plan view) showing a gear train unit in FIG. 3 ; It is an enlarged sectional view of the movement of 2nd Embodiment. FIG. 11 is a schematic diagram (cross-sectional view) showing a train wheel unit of a third embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION The movement and timepiece of the present invention will be described in detail below based on preferred embodiments shown in the accompanying drawings.

<First embodiment>
FIG. 1 is a front view of an electronic timepiece that is the timepiece of the first embodiment. FIG. 2 is a cross-sectional view of the timepiece shown in FIG. 3 is a plan view of a movement included in the timepiece shown in FIG. 1. FIG. FIG. 4 is an enlarged cross-sectional view of the movement included in the timepiece shown in FIG. 5 is a schematic diagram (plan view) showing the train wheel unit in FIG. 3. FIG.

Embodiments of the movement and timepiece of the present invention will be described below with reference to FIGS. 1 to 5. FIG. The dial side is also called "upper" or "front side", and the back cover side is also called "lower" or "back side".

As shown in FIGS. 1 and 2, the electronic timepiece 10 includes a housing 1, a movement 2, a dial 3, and power generating means 4. A pair of belts are provided on the outer edge of the housing 1 and can be worn on the arm.

The housing 1 includes an exterior case 11 , a cover glass 12 and a back cover 13 . The exterior case 11 includes a cylindrical case 111 made of metal and a bezel 112 made of, for example, ceramic. A dial plate 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 , and a circuit board 23 .

The base plate 21 has a function of supporting the drive mechanism 22 and the like. This base plate 21 is attached to a support member 6 which will be described later.

The drive mechanism 22 is mainly attached to the lower side (back cover side) of the main plate 21 . The drive mechanism 22 will be detailed later.

The circuit board 23 covers the back side of the driving mechanism 22 . The circuit board 23 also includes a receiver (GPS module) 231 , a controller 232 and a battery 233 . The battery 233 is composed of a secondary battery such as a lithium ion battery, a silver oxide battery, or the like. In this embodiment, the battery 233 is charged with power generated by the solar battery 5, which will be described later. The circuit board 23 is also connected to an antenna (not shown) and the like via connection pins.
The circuit board 23 is covered from the back side with a conductive circuit holder 25 .

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

A pointer shaft 41 is inserted through the time display portion 31 . The pointer shaft 41 has, for example, a concentric triple tube structure, and each shaft has a second hand 411, a minute hand 412, and an hour hand 413, which are independent of each other. fixed to rotate.

The calendar display section 32 has a function of notifying the date by displaying a part of the calendar wheel 42 printed with numbers from 1 to 31 through the window section 321 provided on the dial plate 3 .

The day-of-the-week display unit 33 has a pointer shaft 43 inserted therein, and has a function of notifying the day of the week by a position pointed by a needle 431 fixed to the pointer shaft 43 .

The multi-indicator 34 has a pointer shaft 44 inserted through it, and has a function of notifying, for example, the remaining power level of the battery 233 according to the position pointed by the needle 441 fixed to the pointer shaft 44 .

A pointer shaft 45 is inserted into the dual time display unit 35, and has a function of notifying the time in another country, for example, according to the position pointed by a hand 451 fixed to the pointer shaft 45.

Further, the pointer shaft 41 is driven by drive mechanisms 22A and 22B, which will be described later. Specifically, the needle 411 is driven by the driving mechanism 22A, and the needles 412 and 413 are driven by the driving mechanism 22B. The calendar wheel 42 is driven by a drive mechanism 22C described later, the pointer shaft 43 is driven by a drive mechanism 22D described later, the pointer shaft 44 is driven by a drive mechanism 22E described later, and the pointer shaft 45 is driven by a drive mechanism 22E described later. Driven by mechanism 22F (see FIG. 3).

In addition, the dial 3 has good light transmittance 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, plastic materials are preferable from the viewpoint of light weight, ease of processing, etc. Among them, polycarbonate is more preferable. In the electronic timepiece 10, light transmitted through the dial 3 reaches the solar cell 5, thereby generating electric power as described above.

The dial 3 preferably has a function of diffusing light. This can prevent or suppress the solar cell 5 on the back side of the dial 3 from being viewed through the dial 3 . Generally, in a wristwatch, it is preferable to make the solar cell 5 as invisible as possible from the outside. When the visibility of the solar cell 5 is suppressed as in the electronic timepiece 10, the aesthetics of the electronic timepiece 10 is improved.

The method for imparting the light diffusion function to the dial 3 is not particularly limited. For example, a diffusion layer containing a diffusing agent is formed on at least one of the front and back surfaces of the dial 3. method, a method of installing a polarizing film, a method of forming a large number of minute unevenness that functions as a prism, and the like.

Such a dial plate 3 has a substantially circular shape in plan view. The base plate 21, the cover glass 12 and the solar cells 5 are similarly circular in plan view.

As shown in FIG. 2 , the power generating means 4 has a solar cell 5 and a support member 6 .
The solar cell 5 has a function of converting light energy into electrical energy. The electric energy converted by the solar cell 5 is used for driving the movement 2 and the like.

The solar cell 5 has a substrate 51 and a solar cell film 52 laminated on the substrate 51 .
The substrate 51 has the function of supporting the solar cell membrane 52 . This substrate 51 is made of a resin material. Examples of the resin material include various thermoplastic resins, various curable resins such as thermosetting resins and photocurable resins.

The solar cell film 52 is formed by, for example, selectively introducing p-type impurities and n-type impurities into a non-single-crystal silicon thin film, and further combining the p-type non-single-crystal silicon thin film and the n-type non-single-crystal silicon thin film. It has a pin structure with an i-type non-single-crystal silicon thin film having a low impurity concentration between them.

Although not shown, an electrode is formed on the solar cell 5, and power generated by the solar cell 5 is supplied to the battery 233 through 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 side of the dial 3 . The support member 6 is made of a frame-shaped member, and is fixed to the solar cell and the dial 3 by fixing means (not shown). Support member 6 is fixed to main plate 21 while supporting dial 3 and solar cell 5 .

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

Since these have substantially the same configuration, the drive mechanism 22A will be described in detail below. The driving mechanism 22A is a portion surrounded by a broken line in FIG.

FIG. 4 is an enlarged cross-sectional view of the vicinity of the drive mechanism 22A. FIG. 5 is a schematic diagram (plan view) of the drive mechanism 22A. As shown in FIGS. 4 and 5, the drive mechanism 22A has a motor 8 and a train wheel unit 9 driven by the motor 8. As shown in FIGS.

The motor 8 is a stepping motor, and includes a stator 84 having a rotor housing hole, a rotor 82 rotatably disposed in the rotor housing hole, a magnetic core joined to the stator 84, and a magnetic core wound around the magnetic core. A coil 83 is provided. The rotor 82 also includes a rotor gear 81 .

The rotor gear 81 is made of, for example, a metal material and has teeth 811 on its outer periphery. This tooth 811 meshes with the tooth 911 of the resin gear 91 . Thereby, the rotational force of the motor 8 is transmitted to the resin gear 91 via the rotor gear 81 of the rotor 82 .

Also, the coil 83 in the motor 8 has terminals at both ends. Each terminal is electrically connected to the control unit 232 . The rotor 82 is magnetized with two poles (S pole and N pole). The stator 84 is made of magnetic material. When a drive pulse is supplied between the terminals of the coil 83 from the control unit 232 and current flows, magnetic flux is generated in the stator 84 . As a result, the interaction between the magnetic poles generated in the stator 84 and the magnetic poles of the rotor 82 causes the rotor 82 to rotate by one step (180 degrees).

The gear train unit 9 includes a resin gear 91 that is a reduction gear that is a first gear that meshes with the rotor gear 81, a metal gear 93 that is a second gear that meshes with the resin gear 91 and to which the needle 411 is fixed. and a train wheel bridge 94 for supporting. These resin gear 91 and metal gear 93 are arranged side by side in this order from the driving side.

The speed reduction ratio of the gear train unit 9 differs for each of the drive mechanisms 22A to 22F, but is approximately 5 or more and 100 or less.

The resin gear 91 has a disk shape, a large gear 910 having teeth 911 on its outer periphery, and a small gear 912 (kana) fixed to the center of one surface of the large gear 910 and rotating coaxially. .

The teeth 911 of the gear wheel 910 mesh with the teeth 811 of the rotor gear 81 . Thereby, the rotational force of the rotor gear 81 is transmitted to the resin gear 91 . The small gear 912 (kana) has a disc shape and has teeth 913 on its outer periphery. This small gear 912 meshes with the metal gear 93 .

The metal gear 93 is disc-shaped and has teeth 931 on its outer periphery. This tooth 931 meshes with the tooth 913 of the small gear 912 . Thereby, the rotational force of the intermediate gear 92 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 together with the rotation of the metal gear 93 .

Such a resin gear 91 and metal gear 93 are supported by a train wheel bridge 94 from the opposite side of the main plate 21 .

Further, as shown in FIG. 4 , connecting means 96 is provided between the train wheel bridge 94 and the circuit board 23 . In this embodiment, the connection means 96 is composed of a long leaf spring having conductivity. One end (the left end in FIG. 4) of the connecting means 96 is in contact with the shaft end of the pointer shaft 41 on the opposite side of the dial 3, and biases the pointer shaft 41 in its axial direction. there is The connecting means 96 is in contact with the circuit board 23 at the other end (right end in FIG. 4). Also, the circuit board 23 is electrically connected to the positive electrode or the negative electrode of the battery 233 . Therefore, the metal gear 93 is electrically connected to the positive or negative pole of the battery 233 via the connection means 96 and the circuit board 23 . Note that the battery 233 has a sufficiently large electrostatic capacity with respect to 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 containing a conductive polymer and a carbon filler, the weight of the resin gear 91 and the intermediate gear 92 is reduced, and the moment of inertia of the resin gear 91 and the intermediate gear 92 is reduced. 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 the needle 411 from being damaged even if torque generated by the rotation of the needle 411 is received.

By the way, in a configuration in which a gear made of a resin material and a gear made of a metal material are meshed and rotated together, static electricity is generated in both gears due to friction and separation, and charges are accumulated. As is known in the electrification series, gears made of resin material are charged negatively and gears made of metal material are charged positively.

Also, since the train wheel bridge 94 facing both gears is made of a resin material, dielectric polarization is caused by the electric field from the electric charges of both gears, and a Coulomb force is generated between both gears and the train wheel bridge 94 .
In addition, since the potentials of 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 bridge 94 stick to each other. As a result, frictional resistance is generated in both gears, causing a problem that the rotation of both gears is hindered.

Further, when the train wheel bridge 94 is made of a conductive material and the train wheel bridge 94 is not grounded, a Johnson-Rahbek force is generated by adjacent gears having different potentials.
In addition, even if the train wheel bridge 94 is made of a conductive material and is grounded, a mirror image charge of the charge on the side surface of both gears is generated in the train wheel bridge 94, so that the Coulomb force is generated. A force equivalent to That is, in either case, a force acts in the direction in which the gears move along the axial direction, and the gears and the train wheel bridge 94 stick to each other to generate frictional resistance, which hinders the rotation of each gear.

In the case of using carbon fibers, carbon nanotubes, or the like, which are general carbon fillers for making gears conductive, the longer the length of the carbon filler, the more advantageous. Specifically, a length of 70 to 200 μm or more is required. A carbon filler of this length does not penetrate to the tooth tip of a small gear of, for example, 0.3 mm or less, so there is a problem that sufficient conductivity cannot be obtained in gears used in timepieces. In addition, thin gears have the problem that the roots of the teeth are easily clogged with filler, making it impossible to form the tips of the teeth. In addition, when boron is doped into the carbon filler to make the gear conductive and the boron is dispersed in the resin material, boron has a high volume resistivity, so sufficient conductivity cannot be obtained and the antistatic effect is not sufficiently exhibited. I have a problem that I can't. In this case, boron is mainly filled in the tip of the tooth, so sufficient conductivity cannot be obtained especially at the tip of the tooth.

Therefore, in this embodiment, such a problem can be eliminated by adopting the following configuration. This will be explained below.

In this embodiment, the resin gear 91 is made of a thermoplastic resin such as polyacetal (POM), polycarbonate, polyamide, polyarylate, polyetherimide, ABS, etc., which is excellent in abrasion resistance and impact resistance, as well as a conductive polymer. , and carbon powder. Specifically, the large gear 910 and the small gear 912 are made of a material containing a conductive polymer and carbon powder. Therefore, even if the resin gear 91 is thin and small, the powdered carbon and the conductive polymer are filled up to all tooth tips, and the entire gear including the tooth tips has conductivity.

Here, as described above, the metal gear 93 is electrically connected to the positive electrode or negative electrode of the battery 233 via the connection means 96 and the circuit board 23 . Therefore, the resin gear 91 meshing with the metal gear 93 can be electrically connected to the battery 233 via the metal gear 93 , the connection means 96 and the circuit board 23 . The battery 233 has a sufficiently large electrostatic capacity against static electricity generated in the resin gear 91 and the metal gear 93 . Therefore, static electricity generated in the metal gear 93 can be discharged.

Also, since the resin gear 91 meshing with the metal gear 93 has conductivity, it is electrically connected to the battery 233 via the metal gear 93 , the connection means 96 and the circuit board 23 .

As described above, in the gear train unit 9, the resin gear 91 and the metal gear 93 can be discharged, thereby preventing the above-described problems caused by the accumulation of static electricity in the resin gear 91 and the metal gear 93. can be done.

The conductive polymer is preferably at least one selected from the group consisting of polythiophene, polyacetylene, polyaniline, polyparaphenylene and polyparaphenylenevinylene, doped with impurities such as sulfonic acid or iodine. As a result, the resin gear 91 is excellent in light weight, abrasion resistance, and impact resistance while sufficiently ensuring electrical conductivity.

Among these, the conductive polymer is preferably polythiophene doped with impurities. Thereby, the resin gear 91 is further excellent in conductivity.

The surface resistivity (surface electrical resistivity) of such a resin gear 91 is preferably 10 ⁷ Ω/□ or more and 10 ¹¹ Ω/□ or less, and is 10 ⁸ Ω/□ or more and 10 ¹⁰ Ω/□ or less. is more preferred. Thereby, the effect of this embodiment can be obtained more remarkably.

The volume resistivity (volume electrical resistivity) of the resin gear 91 is preferably 10 ⁷ Ω·cm or more and 10 ¹¹ Ω·cm or less, and is 10 ⁸ Ω·cm or more and 10 ¹⁰ Ω·cm or less. is more preferred. Thereby, the effect of this embodiment can be obtained more remarkably.

Also, the content of the conductive polymer in the resin gear 91 is preferably 90 wt % or more and 99.9 wt % or less, and more preferably 93 wt % or more and 97 wt % or less. As a result, the effects of the present embodiment can be sufficiently obtained, and sufficient strength of the resin gear 91 can be ensured.

Examples of the carbon powder include carbon blacks such as acetylene black and ketjen black, and conductive materials such as graphite and hard carbons. As a result, the resin gear 91 can be reinforced, the conductivity can be improved, and the effects of the present embodiment can be obtained more reliably.

Particles constituting the carbon powder are not particularly limited, and examples thereof include scaly and spherical particles.

Further, the average aspect ratio of each particle of the carbon powder is preferably 1 or more and 3 or less, more preferably 1.3 or more and 2.7 or less. By including the carbon powder in this way, the strength of the resin gear 91 can be increased. Furthermore, moldability can be improved compared to the case where carbon fiber or the like is contained in the conductive polymer. In particular, at fine portions such as the teeth 921, the fibers tend to pop out and the residual stress tends to increase, so the roundness as a whole decreases. can be done. Furthermore, since it is in powder form, the resin containing carbon powder and conductive polymer can be filled up to the tip of the tooth without causing clogging at the root of the tooth, ensuring sufficient conductivity to the tip of the tooth. can. Further, during molding, the conductive polymer can be filled up to the tips of the teeth of the mold, resulting in excellent moldability.

The average particle size of the carbon powder is preferably 1 μm or more and 50 μm or less, more preferably 2 μm or more and 30 μm or less. As a result, it is possible to ensure sufficient strength of the resin gear 91 while sufficiently ensuring the electrical conductivity of the resin gear 91, and further improve moldability.

Also, the content of the carbon powder in the resin gear 91 is preferably 0.1 wt % or more and 10 wt % or less, and more preferably 0.5 wt % or more and 5 wt % or less. Thereby, sufficient strength of the resin gear 91 can be ensured while sufficiently ensuring the electrical conductivity of the resin gear 91 .

Thus, the gear train unit 9 has a resin gear 91 that meshes with the metal gear 93, and the resin gear 91 is made of a material containing a conductive polymer and carbon filler. When the resin gear 91 and the metal gear 93 mesh with each other, static electricity tends to be generated in the resin gear 91, but even in this case, the effects of the present embodiment are exhibited more effectively. The resin gear 91 is an example of a first gear, and the metal gear 93 is an example of a second gear.

The gear train unit 9 also has a resin gear 91 that meshes with a rotor gear 81 fixed to the rotating shaft of the motor 8 . As a result, the weight of the resin gear 91 can be reduced, and the moment of inertia of the resin gear 91 can be suppressed. Further, the rotor gear 81 is made of a metal material, and static electricity is likely to accumulate in the resin gear 91. It has become. Therefore, the effect of this embodiment is exhibited more effectively.

Further, as described above, the gear train unit 9 drives the second hand (hand 411 ) of the timepiece, and the second hand is fixed to the metal gear 93 . In the gear train unit 9 of the drive mechanism 22A that drives the second hand, the rotation speed of the resin gear 91 and the metal gear 93 is relatively high, and static electricity is easily accumulated. Therefore, the effect of this embodiment is exhibited more effectively.

Also, the metal gear 93 is located on the driven side, that is, on the distal side of the motor 8, relative to the resin gear 91 . In such a configuration, the metal gear 93 is easily affected by the torque from the needle 411, but since it is made of a metal material, it has high strength and excellent durability.

In the present embodiment, the resin gears 91 are conductive in all the train wheel units 9 of the drive mechanisms 22A to 22F, so that the above effects are obtained in all of the drive mechanisms 22A to 22F. be able to.

Further, the gear train unit 9 may have an intermediate gear between the resin gear 91 and the metal gear 93 . If this intermediate gear is not made of a metal material, like the resin gear 91, it may be made of polyacetal (POM), polycarbonate, polyamide, polyarylate, polyetherimide, ABS, or the like, which is resistant to wear and impact. In addition to excellent thermoplastic resin, it is composed of materials including conductive polymer and carbon powder. In this case, since the resin gear 91 is in contact with the metal gear 93 via the intermediate gear, it is electrically connected to a structure having a sufficiently large capacitance such as the battery 233, thereby discharging both the resin gear 91 and the intermediate gear. It can be carried out.

Further, the resin gear 91 may contain powder other than carbon powder. As the powder, conductive powder such as metal particles or non-conductive powder such as glass particles can be used.

Further, in the present embodiment, the connection means 96 is connected to the end surface of the pointer shaft 41, but is not limited to this. may have been

In the present embodiment, the reference electrode connected by the connection means 96 is the positive electrode or the negative electrode of the battery 233, but it is limited to this if the electrostatic capacity is sufficiently large against the static electricity generated in each gear. It may be connected to the exterior case 11 instead of being connected to the exterior case 11, for example. In this case, the circuit board 23 may be included in the conductive path.

As described above, according to the present embodiment, the train wheel unit 9 (gear train) is composed of the resin gear 91, which is the first gear made of a material containing a conductive polymer and carbon powder, and a metal material. and a metal gear 93, which is a second gear and transmits the driving force of the motor 8 driven by a battery as a power source.

According to such a configuration, the resin gear 91 and the intermediate gear 92 can be electrically conductive to all tooth tips, and even if the gears are made thinner, the tooth tips can be formed stably. The intermediate gear 92 is an example of a first gear. In addition, the resin gear 91 is always at the same potential as the metal gear 93, which not only prevents electrification due to friction and peeling, but also allows the resin gear 91, the metal gear 93, and the train wheel support 94 to react with any of the Johnson-Rahbek force and the gradient force. occurrence can also be prevented. Further, since the pointer shaft 41 and the connecting means 96 are connected to the positive electrode or the negative electrode of the battery 233 to stabilize the electric potential, the generation of Coulomb force in the resin gear 91, the metal gear 93 and the train wheel support 94 can be prevented. , it is possible to prevent problems caused by sticking of the resin gear 91 and the metal gear 93 .

The movement 2 also includes a wheel train unit 9 . Thereby, the movement 2 exhibiting the above effects can be obtained.

The electronic timepiece 10 also includes a movement 2 and a housing 1 (casing) that houses the movement 2 . As a result, the electronic timepiece 10 that exhibits the above effects is obtained.

In this embodiment, the large gear 910 and the small gear 912 are integrally formed in the resin gear 91, but the present invention is not limited to this. It may be formed by joining (for example, bonding, fusing, or press-fitting) separate bodies. In this case, part of the large gear 910 and the small gear 912 may be made of a metal material.

Moreover, in the present embodiment, the configuration using the solar cell as the power generation function of the power generation means 4 has been described, but the power generation function is not limited to this, and may be the power generation function using an oscillating weight. Alternatively, it may be composed only of the battery 233 that does not have a power generation function.

<Second embodiment>
FIG. 6 is an enlarged sectional view of the movement of the second embodiment.

A second embodiment of the movement and timepiece of the present invention will be described below with reference to this drawing, but the description will focus on the differences from the above-described embodiment, and the description of the same items will be omitted.

This embodiment is basically the same as the first embodiment except that the train wheel bridge has conductivity and the configuration of the connecting means is different.

Since the resin gear 91 is axially movable, it comes into contact with the train wheel bridge 94 or separates from it. As a result, the surface of the train wheel bridge 94 facing the resin gear 91 and the metal gear 93 is charged and a Coulomb force is generated, causing the resin gear 91 and the metal gear 93 to stick to the train wheel bridge 94 . As a result, a frictional resistance is generated between the resin gear 91 and the train wheel support 94 , causing a problem that the rotation of the resin gear 91 and the metal gear 93 is hindered. The resin gear 91 is an example of a first gear, and the metal gear 93 is an example of a second gear.

The resin gear 91 is made of a material containing a conductive polymer and carbon powder, as described in the first embodiment. That is, the large gear 910 and the small gear 912 are made of a material containing a conductive polymer and carbon powder.

In this embodiment, the train wheel bridge 94 is also conductive. The gear train bridge 94 is made of a material containing a resin material and a carbon filler or fine fibrous metal. As a result, it is excellent in lightness, abrasion resistance, and impact resistance while sufficiently ensuring conductivity.

Examples of the resin material include polyacetal, polycarbonate, polyamide, polyarylate, polyetherimide, acrylonitrile-butadiene-styrene copolymer, and the like. Examples of carbon fillers include carbon powder, carbon fibers, carbon nanotubes, and the like. Examples of fibrous metals include metallized fibers obtained by coating copper, stainless steel, glass fibers, and acicular ceramics with aluminum or copper.

Further, as shown in FIG. 6, in this embodiment, the train wheel bridge 94 is connected to the positive or negative pole of a battery 233 (not shown) by a connection means 96 . In this embodiment, the connection means 96 is configured by, for example, a conducting wire or the like.

According to such a configuration, the resin gear 91, the metal gear 93, and the train wheel bridge 94 are at the same potential, which not only prevents electrification due to friction and peeling, but also prevents the resin gear 91, the metal gear 93, and the train wheel bridge 94 from Generation of Coulomb force, Johnson-Rahbek force, and gradient force can be prevented. Furthermore, the resin gear 91 and the metal gear 93 in contact with the train wheel bridge 94 can be connected to the train wheel bridge 94 without being connected to the pointer shaft 41 by using a complicated shape such as an elongated plate spring structure for the connecting means 96 . 96 can be connected to the positive or negative terminal of battery 233 . As a result, the potential is stabilized, and problems due to gear sticking can be prevented. Furthermore, the structure in which the connecting means 96 is in contact with the end face of the shaft of each gear can be omitted, so that each gear can rotate smoothly.

Further, the main plate 21 may also be made of the same conductive material as the gear train bridge 94 and may have conductivity. In this case, only the main plate 21 may be conductive, and the train wheel bridge 94 may be made of a non-conductive material as in the first embodiment, or both the main plate 21 and the train wheel bridge 94 may be It may have conductivity. Thereby, the effects as described above can be obtained.

<Third Embodiment>
FIG. 7 is a schematic diagram (cross-sectional view) showing the train wheel unit of the third embodiment.

Hereinafter, a third embodiment of the movement and timepiece of the present invention will be described with reference to this figure, but the description will focus on the differences from the above-described embodiments, and the description of the same items will be omitted.

This embodiment is basically the same as the first embodiment except that the configuration of the train wheel unit is different.

As shown in FIG. 7 , in this embodiment, the train wheel unit 9 has a detection gear 95 (second detection gear) that meshes with the small gear 912 of the resin gear 91 . The detection gear 95 has the same number of teeth as the metal gear 93 and rotates at the same rotation period as the metal gear 93 .

A through-hole is formed in each of the resin gear 91 and the detection gear 95, and the through-hole of the detection gear 95 and the through-hole of the resin gear 91 overlap in plan view at one point during one rotation of the detection gear 95. is formed as An optical sensor circuit board (not shown) is arranged between the detection gear 95 and the resin gear 91 and the base plate 21, and the optical sensor circuit board is provided with a light emitting device at the same position in plan view as the position where the through holes overlap. A light-emitting element such as a diode (LED), a light-emitting polymer (OLED), or an inorganic EL is provided. Further, the circuit board 23 is provided with a light receiving element such as a photodiode, a phototransistor, or a cadmium sulfide cell (Cds) at the same position in plan view as the position where the through holes overlap. The position of the needle 411 at the reference position can be detected by the light from the light-emitting element passing through the overlapping through-holes and being detected by the light-receiving element.

Also, the detection gear 95 is made of a material containing a conductive polymer and carbon powder as described in the above embodiment. As a result, for example, the detection gear 95 can be electrically connected to the metal gear 93 via the resin gear 91 without connecting wiring to the rotation axis (central axis) of the detection gear 95 . can be electrically connected to the positive or negative terminal of battery 233 . As a result, it is possible to discharge the detection gear 95 and prevent the above-described troubles caused by accumulation of static electricity in the detection gear 95 . The detection gear 95 is an example of a first gear.

Although the movement and timepiece of the present invention have been described above using the illustrated embodiments, the present invention is not limited to this, and each part constituting the train wheel unit, the movement, and the timepiece has the same function. It can be replaced with any practicable configuration. Moreover, arbitrary components may be added.

In addition, in the above-described embodiments, a wristwatch type electronic timepiece has been described as an example, but the present invention is not limited to this, and can be applied to, for example, table clocks, pendant type timepieces, pocket watches, and the like.

In addition, the train wheel unit is not limited to the electronic watch as described above, and examples include smart glasses, smartphones, tablet terminals, wearable terminals such as HMDs (head mounted displays), car navigation devices, electronic diaries (also with communication functions). ), electronic dictionaries, calculators, electronic game devices, word processors, videophones, security TV monitors, electronic binoculars, POS terminals, medical equipment (e.g., electronic thermometers, sphygmomanometers, blood glucose meters, electrocardiogram measuring devices, ultrasonic diagnostic devices, electronic endoscopes), fish finders, various measuring instruments, instruments (for example, instruments of vehicles, aircraft, and ships), flight simulators, and the like.

REFERENCE SIGNS LIST 1 housing 2 movement 3 dial 4 power generating means 5 solar cell 6 support member 8 motor 9 wheel train unit 10 electronic timepiece 11 exterior case 12 ... cover glass 13 ... back cover 21 ... main plate 22 ... drive mechanism 22A ... drive mechanism 22B ... drive mechanism 22C ... drive mechanism 22D ... drive mechanism 22E ... drive mechanism 22F ... drive mechanism 23 ... drive mechanism Circuit board 25 Circuit holder 31 Time display unit 32 Calendar display unit 33 Day of the week display unit 34 am/pm display unit 34 Multi-indicator 35 Dual time display unit 41 Pointer shaft , 42 ... pointer shaft 43 ... pointer shaft 44 ... pointer shaft 45 ... pointer shaft 46 ... pointer shaft 51 ... substrate 52 ... solar cell film 81 ... rotor gear 82 ... rotor 83 ... coil 84 ... Stator, 91 ... Resin gear, 92 ... Intermediate gear, 93 ... Metal gear, 94 ... Train wheel support, 95 ... Detection gear, 96 ... Connection means, 111 ... Case, 112 ... Bezel, 232 ... Control unit, 233 ... Battery , 411... Needle, 421... Needle, 431... Needle, 441... Needle, 451... Needle, 461... Needle, 811... Tooth, 910... Large gear, 911... Tooth, 912... Small gear, 913... Tooth, 920... Large gear, 921...tooth, 922...small gear, 923...tooth, 931...tooth

Claims (13)

a battery-powered motor,
a first gear that transmits the driving force of the motor and is made of a material containing a conductive polymer and carbon powder;
a second gear that transmits the driving force of the motor and is made of a metal material;
A movement characterized by comprising a Movement according to claim 1, comprising a conductive train wheel support supporting said first gear and said second gear. Movement according to claim 1 or 2, comprising an electrically conductive main plate supporting said first gear and said second gear. 4. The conductive polymer according to any one of claims 1 to 3, wherein at least one of the group consisting of polythiophene, polyacetylene, polyaniline, polyparaphenylene and polyparaphenylene vinylene is doped with an impurity. movement. The movement according to any one of claims 1 to 4, wherein the content of the conductive polymer in the first gear is 90 wt% or more and 99.9 wt% or less. The movement according to any one of claims 1 to 5, wherein the carbon powder has an average particle size of 1 µm or more and 50 µm or less. The movement according to any one of claims 1 to 6, wherein a content of said carbon powder in said first gear is 0.1 wt% or more and 10 wt% or less. Movement according to any one of the preceding claims, wherein said first gear meshes with said second gear. 9. A movement according to any one of claims 1 to 8, wherein the first gear meshes with a gear fixed to the rotating shaft of the motor. 10. Movement according to any one of claims 1 to 9, comprising a plurality of said first gears meshing with each other. 11. The movement according to any one of claims 1 to 10, wherein said second gear is located on the driven side of said first gear. Movement according to any one of claims 1 to 11, wherein a second hand is fixed to said second gear. a battery;
a motor driven by the electric power of the battery;
a first gear that transmits the driving force of the motor and is made of a material containing a conductive polymer and carbon powder;
a second gear that transmits the driving force of the motor and is made of a metal material;
A timepiece comprising: a casing that houses the battery, the motor, the first gear, and the second gear.

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