Mechanical watch

Abstract

To efficiently take out electric power in a mechanical timepiece 1 that adjusts rate using electromagnetic means.SOLUTION: The mechanical timepiece 1 has: a balance wheel 31; a balance spring 32; a permanent magnet 41; a soft magnetic core 42; a control circuit 44 for adjusting rate on the basis of counter electromotive voltage generated in a coil 43 by motion of the permanent magnet 41 accompanying forward motion and reverse motion of the balance wheel 31, and a reference vibration-frequency of a reference signal source; a rectification circuit 50 for rectifying a current generated in the coil 43 by the motion of the permanent magnet 41 accompanying the forward motion and the reverse motion of the balance wheel 31; and a power supply circuit 60 for driving the control circuit 44 on the basis of the current rectified by the rectification circuit 50. The permanent magnet 41 is arranged so that a magnetization direction faces a side of a first end portion 421a or a second end portion 422a in a state where the balance spring 32 is at a neutral position of its elastic deformation.SELECTED DRAWING: Figure 13A

Description

Technical Field

[0001] The present invention relates to a mechanical watch.

Background Art

[0002] Patent Document 1 discloses a mechanical watch having a function of performing step adjustment by generating electricity based on the movement of a magnet attached to a spindle (temple) and observing the period of rotation of the temple (for example, paragraphs 0072 and 0073 of Patent Document 1, FIG. 27, etc.). Further, Patent Document 2 discloses a configuration in which power generation is performed by full-wave rectification using a rectifier including four diodes (for example, FIG. 13 of Patent Document 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, since the electric power generated by the movement of the magnet accompanying the movement of the temple is minute, a device for efficiently extracting the electric power is required. However, when full-wave rectification is performed by a rectifier including a plurality of diodes as in Patent Document 2, a voltage drop occurs according to the number of diodes, resulting in power loss.

[0005] The present invention has been made in view of the above problems, and an object thereof is to efficiently extract electric power in a mechanical watch that performs step adjustment using electromagnetic means.

Means for Solving the Problems

[0006] (1) A speed control mechanism including a power source, a tent wheel driven by the power from the power source, and a beard spring that elastically deforms to rotate the tent wheel forward and backward; a two-polarized permanent magnet that rotates forward and backward along with the forward and backward rotational movement of the tent wheel; a coil; a first end portion provided along the outer periphery of the permanent magnet; and a second end portion provided along the outer periphery of the permanent magnet and arranged to face the first end portion through the permanent magnet, a soft magnetic core that forms a magnetic circuit together with the coil, a control circuit that performs step adjustment based on the detection voltage generated in the coil due to the movement of the permanent magnet accompanying the forward and reverse movement of the tent wheel and the reference oscillation frequency of a reference signal source, a rectifying circuit that rectifies the current generated in the coil due to the movement of the permanent magnet accompanying the forward and reverse movement of the tent wheel, and a power supply circuit that drives the control circuit based on the current rectified by the rectifying circuit, wherein the permanent magnet is arranged such that the magnetization direction faces the side of the first end portion or the second end portion in a state where the beard spring is at the neutral position of its elastic deformation, a mechanical clock.

[0007] (2) In (1), the mechanical clock, wherein the permanent magnet is arranged such that the magnetization direction is in the same direction as the opposing direction between the first end portion and the second end portion in a state where the beard spring is at the neutral position of its elastic deformation.

[0008] (3) In (1) or (2), the mechanical clock, wherein the soft magnetic core includes a first separation portion that separates the magnetic coupling between the first end portion and the second end portion, and a second separation portion that separates the magnetic coupling between the first end portion and the second end portion and is arranged to face the first separation portion through the permanent magnet, and the permanent magnet is arranged such that the magnetization direction is orthogonal to the opposing direction between the first separation portion and the second separation portion in a state where the beard spring is at the neutral position.

[0009] (4) In (1) or (2), the soft magnetic core includes a first separation part that separates the magnetic coupling between the first end part and the second end part, and a second separation part that separates the magnetic coupling between the first end part and the second end part and is arranged to face the first separation part via the permanent magnet. The permanent magnet includes an N - pole part and an S - pole part. In a state where the hairspring is in the neutral position, the boundary between the N - pole part and the S - pole part is arranged to overlap a virtual belt - shaped region connecting the first separation part and the second separation part. A mechanical watch.

[0010] (5) In any one of (1) to (4), the ratchet wheel is at a power supply position where power from the power source is supplied in a state where the hairspring is in the neutral position. A mechanical watch.

[0011] (6) In (5), the permanent magnet is arranged such that the detected detection voltage has the same polarity until it rotates 180° in the positive or negative direction from the power supply position. A mechanical watch.

[0012] (7) In any one of (1) to (6), it has a rotation detection circuit that detects a detection signal based on the detection voltage, and a speed - regulating pulse output circuit that outputs a speed - regulating pulse for controlling the movement of the ratchet wheel. The control circuit controls the speed - regulating pulse output circuit based on the detection timing of the detection signal and the output timing of a reference signal based on the reference vibration frequency. A mechanical watch.

[0013] (8) In (7), when the detection timing of the detection signal is earlier than the output timing of the reference signal, the speed - regulating pulse output circuit outputs the speed - regulating pulse to either the first terminal or the second terminal of the coil. When the detection timing of the detection signal is later than the output timing of the reference signal, the speed - regulating pulse output circuit outputs the speed - regulating pulse to the other one of the first terminal or the second terminal. A mechanical watch.

[0014] (9) In (7) or (8), the speed control pulse output circuit is configured to output a plurality of the speed control pulses having different output periods, a mechanical clock.

[0015] (10) In any one of (7) to (9), the speed control pulse output circuit is configured to output a plurality of the speed control pulses having different duty ratios, a mechanical clock.

[0016] (11) In (9) or (10), the speed control pulse output circuit outputs the speed control pulse according to the deviation amount of the detection timing of the detection signal with respect to the output timing of the reference signal, a mechanical clock.

[0017] (12) In (11), it has an accumulation unit that accumulates the deviation amount of the detection timing of the detection signal with respect to the output timing of the reference signal, and the speed control pulse output circuit outputs the speed control pulse according to the deviation amount accumulated in the accumulation unit, a mechanical clock.

[0018] (13) In any one of (1) to (12), it is provided in a predetermined direction with respect to the rotation axis of the ten-wheel, and further has a deceleration means that acts on the ten-wheel during the intermediate periods of the forward and reverse rotational movements of the ten-wheel to decelerate the ten-wheel, and the ten-wheel includes a portion formed in the circumferential direction and a portion to be acted on by the deceleration means, a mechanical clock.

[0019] (14) In (13), the control circuit performs step adjustment based on the detection voltage generated in the coil by the movement of the permanent magnet and the reference frequency before the portion to be acted on reaches the position of the deceleration means during the forward and reverse rotational movements of the ten-wheel, a mechanical clock.

[0020] (15) In (13) or (14), the control circuit performs step adjustment during the period after the portion to be acted on reaches the position of the deceleration means during the forward and reverse rotational movements of the ten-wheel, a mechanical clock.

[0021] (16) In any one of (13) to (15), in the forward and reverse rotational movements of the balance wheel, the control circuit is driven by the back electromotive force generated in the coil by the movement of the permanent magnet before the actuated part reaches the position of the deceleration means. A mechanical clock.

[0022] (17) In any one of (1) to (16), the diode included in the rectifier circuit is one. A mechanical clock.

[0023] (18) In any one of (1) to (17), the hairspring is made of resin. A mechanical clock.

[0024] (19) In any one of (1) to (18), at least a pair of notches facing each other that reduce the holding torque of the permanent magnet are formed at the first end and the second end. A mechanical clock.

[0025] (20) In any one of (1) to (19), the hairspring is provided so as to reciprocate the balance wheel once in 2 seconds. A mechanical clock.

Advantages of the Invention

[0026] According to the aspects (1) to (20) of the present invention described above, in a mechanical clock that performs pace adjustment using electromagnetic means, power can be efficiently extracted.

Brief Description of the Drawings

[0027]

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Embodiments for Carrying Out the Invention

[0028] Hereinafter, embodiments of the present invention (hereinafter referred to as "the present embodiment") will be described in detail with reference to the drawings.

[0029] [Overview of the overall configuration] First, with reference to FIGS. 1 to 8, an overview of the overall configuration of the mechanical watch 1 according to the present embodiment will be described. FIG. 1 is a perspective view showing the base plate of the present embodiment and each member incorporated therein. FIG. 2 is a perspective view showing the mechanism for transmitting power and its periphery in the present embodiment. FIG. 3 is an exploded perspective view showing the speed regulating mechanism and its peripheral members in the present embodiment disassembled from the base plate. Note that FIGS. 1 to 3 show the mechanical watch 1 as seen from the back side. Here, the back side means the side where the back cover of the outer case is arranged in the thickness direction of the mechanical watch 1.

[0030] FIG. 4 is a view showing a cross section of the support member and the soft magnetic core in the present embodiment and its periphery. FIG. 5 is a plan view showing the soft magnetic core and its periphery in the present embodiment, and an enlarged plan view showing a part thereof enlarged. FIG. 6 is a plan view showing the speed regulating mechanism and its periphery in the present embodiment. FIG. 7 is a graph for explaining the holding torque of the permanent magnet in the present embodiment. FIG. 8 is a block diagram showing the overall configuration of the mechanical watch according to the present embodiment. Note that FIG. 5 shows the mechanical watch 1 as seen from the back side, and FIG. 6 shows the mechanical watch 1 as seen from the front side. Here, the front side means the side where the user visually recognizes the hands and the dial in the thickness direction of the mechanical watch 1.

[0031] In the present embodiment, the counterclockwise direction of the tenon ring 31 and the permanent magnet 41 in each figure except FIG. 6 is defined as the positive direction, and the clockwise direction is defined as the negative direction.

[0032] The mechanical clock 1 uses the mainspring 11 as a power source, controls the movement of the mainspring 11 by the escapement mechanism 20 and the speed regulating mechanism 30, and drives the hands. The mechanical clock 1 is formed by housing a floor board 10 in which each mechanism for driving the hands is incorporated in an outer case. In this embodiment, the illustration of the outer case is omitted. Also, the illustration of the crown disposed on the side surface of the outer case is omitted. The crown is attached to the end of the winding stem 2 shown in FIG. 1.

[0033] [Overview of the overall configuration: Configuration of the drive mechanism] The overview of the drive mechanism provided in the mechanical clock 1 will be described. In this embodiment, the mechanism including the mainspring 11 as a power source, the gear train 12, and the hand shaft 13 is referred to as the "drive mechanism". In FIG. 2, only the second hand 131 among the hands is illustrated. The drive mechanism shown in FIG. 2 is an example and is not limited thereto, and may include gears other than the illustrated gears.

[0034] The mainspring 11 is formed of a metal strip and is housed in a barrel 110 in which a plurality of teeth are formed on the outer periphery. The barrel 110 has a disk shape, and a cavity for housing the mainspring 11 is formed inside. The mainspring 11 is fixed to a barrel arbor (not shown) which is a rotating shaft provided at the center of the barrel 110 at its inner end, and its outer end is fixed to the inner side surface of the barrel 110. When the crown is rotated by the user's operation, the winding stem 2 rotates. As the winding stem 2 rotates, the mainspring 11 is wound up. The wound-up mainspring 11 is unwound by its elastic force. As the mainspring 11 operates at this time, the barrel 110 rotates.

[0035] The wheel train 12 includes at least the second wheel 122, the third wheel 123, and the fourth wheel 124. The second wheel 122 includes a kana that meshes with a plurality of teeth formed on the incense box 110 that functions as the first wheel, a rotating shaft, and a plurality of teeth, and transmits the rotation of the incense box 110 to the third wheel 123. The rotating shaft of the second wheel 122 is the pointer shaft of the minute hand (not shown). The third wheel 123 includes a kana that meshes with a plurality of teeth of the second wheel 122, a rotating shaft, and a plurality of teeth, and transmits the rotation of the second wheel 122 to the fourth wheel 124. The fourth wheel 124 includes a kana that meshes with a plurality of teeth of the third wheel 123, a rotating shaft, and a plurality of teeth, and transmits the rotation of the third wheel 123 to the escapement mechanism 20. As shown in FIG. 2, the rotating shaft of the fourth wheel 124 is the pointer shaft 13 of the second hand 131.

[0036] [Overview of the overall configuration: Configuration of the escapement mechanism 20 and the speed regulating mechanism 30, and overview of their operations] Next, the escapement mechanism 20 and the speed regulating mechanism 30 will be described. The power from the power spring 11 is transmitted to the escapement mechanism 20 and the speed regulating mechanism 30 through the wheel train 12. The escapement mechanism 20 is configured to include a pinion 21 and an anchor 22. The speed regulating mechanism 30 is configured to include a tension wheel 31 and a hairspring 32. Note that the speed regulating mechanism 30 may also be called a templet.

[0037] The pinion 21 is a component that receives the rhythm engraved by the escapement mechanism 20 from the anchor 22 by meshing with the anchor 22 and converts it into a regular reciprocating motion. The pinion 21 includes a kana that meshes with a plurality of teeth of the fourth wheel 124, a rotating shaft, and a plurality of teeth. As shown in FIG. 2, the plurality of teeth of the pinion 21 are formed with a wider circumferential interval than the teeth of each gear of the wheel train 12.

[0038] The ankle 22 rotates forward and backward about the true ankle 221 shown in Fig. 5 as the rotation axis. The ankle 22 extends from the true ankle 221 toward the center of the ten-ring 31 (true ten 311), and has a rod portion 222 that collides with the pendulum stone 315 (see Fig. 6) that rotates with the true ten 311. Note that the pendulum stone 315 is fixed to a disk-shaped portion of the true ten 311 that has a predetermined width in the radial direction. Fig. 6 shows the state where the ten-ring 31 has rotated by θ from the position of the rotation angle of 0°, and the position of the pendulum stone 315 in that state.

[0039] In addition, the ankle 22 has a first arm portion 223 to which an engaging claw 223a that collides with a plurality of teeth of the gang wheel 21 is attached, and a second arm portion 224 that extends in the opposite direction of the first arm portion 223 and to which a projecting claw 224a that collides with a plurality of teeth of the gang wheel 21 is attached. Note that the engaging claw 223a and the projecting claw 224a may be made of a stone such as sapphire, for example.

[0040] The ten-ring 31 rotates forward and backward by the power transmitted by the wheel train 12 with the true ten 311 as the rotation center. In the following description, the forward movement in the forward and backward rotation movement may be referred to as "forward rotation", and the reverse movement may be referred to as "reverse rotation". The details of the configuration of the ten-ring 31 will be described later. The true ten 311 is supported by the support member 33 shown in Figs. 3 and 4.

[0041] The beard spring 32 expands and contracts (elastically deforms) so as to rotate the ten-ring 31 forward and backward. The beard spring 32 is spiral, its inner end is fixed to the true ten 311, and its outer end is fixed to the beard receiver 34. Note that the beard receiver 34 is fixed to the floor board 10 together with the support member 33. Further, as shown in Fig. 3, the beard receiver 34 is provided sandwiched between the support member 33 and the frame member 35.

[0042] The gang gear 21 rotates along with the rotation of the fourth wheel 124. When the gang gear 21 rotates, it collides with the engaging claw 223a of the crank 22, and the crank 22 rotates about the crank center 221. The rod portion 222 of the rotated crank 22 collides with the pendulum weight 315 fixed to the pendulum plate 311, thereby causing the pendulum wheel 31 to rotate. When the pendulum wheel 31 rotates, the disengaging claw 224a of the crank 22 collides with the gang gear 21 to stop the gang gear 21. When the pendulum wheel 31 rotates in the reverse direction due to the restoring force of the hairspring 32, the engaging claw 223a of the crank 22 is released and the gang gear 21 rotates again. As will be described later, since the pendulum wheel 31 is designed to operate in one cycle in 2 seconds, the gang gear 21 will perform one step of operation per second.

[0043] As described above, the speed regulating mechanism 30 repeatedly rotates the pendulum wheel 31 in the forward and reverse directions (reciprocating motion) at a constant period by the telescopic motion of the hairspring 32. The escapement mechanism 20 continuously applies a force for the reciprocating motion to the pendulum wheel 31. With such a configuration and operation, the hands such as the second hand 131 are driven.

[0044] [Overview of the overall configuration: Configuration of the pace adjustment means 40] Next, the configuration of the pace adjustment means 40 will be described. The mechanical clock 1 according to the present embodiment includes a pace adjustment means 40 in addition to a driving mechanism, an escapement mechanism 20, and a speed regulating mechanism 30.

[0045] The pace adjustment means 40 is composed of a permanent magnet 41, a soft magnetic core 42 (sometimes called a stator), a coil 43, and various circuits (see FIG. 8). The pace adjustment means 40 performs pace adjustment based on a detection signal detected based on the forward and reverse rotational motion of the permanent magnet 41 and the reference frequency of the crystal oscillator 70 (see FIG. 8) which is a reference signal source. In the present embodiment, the crystal oscillator 70 is used as the reference signal source to achieve high frequency accuracy, but it is not limited thereto. For example, a CR oscillator composed of a capacitor and a resistor may be used.

[0046] Although illustration is omitted, the coil 43 may be arranged so as to overlap with the middle frame provided inside the outer case in a plan view. Alternatively, a notch may be formed in a part of the circumferential direction of the middle frame, and the coil 43 may be arranged in the notch.

[0047] The permanent magnet 41 is a disk-shaped rotating body magnetized with two poles, and is magnetized with N and S poles in the radial direction. That is, the permanent magnet 41 is a magnet including an N-pole portion 411 and an S-pole portion 412.

[0048] The permanent magnet 41 is attached to the spindle 311 which is the rotation axis of the turntable 31 (see FIG. 10 described later), and is provided so as to perform forward and reverse rotation motions along with the forward and reverse rotation motions of the turntable 31 (spindle 311). That is, the permanent magnet 41 rotates forward and reverse together with the turntable 31 so that its rotation angle is the same as that of the turntable 31. The permanent magnet 41 may be fixed to the spindle 311 by press-fitting, adhesion, or the like.

[0049] The permanent magnet 41 may be an isotropic magnet whose easy magnetization axis faces in a random direction. The permanent magnet 41 may be magnetized by applying a magnetic field with a Helmholtz coil or the like in a state where it is attached to the spindle 311. By adopting such a magnetization method, the magnetization direction of the permanent magnet 41 can be accurately adjusted.

[0050] The soft magnetic core 42 is made of a soft magnetic material, and as shown in FIG. 5, includes a first magnetic portion 421 including a first end portion 421a provided along the outer circumference of the permanent magnet 41, and a second magnetic portion 422 including a second end portion 422a provided along the outer circumference of the permanent magnet 41, and constitutes a magnetic circuit together with the coil 43. The first end portion 421a and the second end portion 422a both have a shape with a semi-circular arc-shaped inner peripheral surface, and are arranged to face each other with the permanent magnet 41 interposed therebetween.

[0051] In this embodiment, when the wiper 32 is in the neutral position of elastic deformation, the permanent magnet 41 has its N-pole portion 411 disposed on the side of the second magnetic portion 422 and its S-pole portion 412 disposed on the side of the first magnetic portion 421 (see the enlarged view in FIG. 5). Note that the arrangement of the N-pole portion 411 and the S-pole portion 412 may be reversed, but in that case, it is necessary to reverse the winding direction of the coil 43 compared to this embodiment.

[0052] Further, as shown in FIGS. 3 and 4, the soft magnetic core 42 is fixed to the support member 33 by a pipe 33a and a screw 33b which are fixtures. With such a configuration, the soft magnetic core 42 is assembled to the floor 10 together with the support member 33. Also, the support member 33 and the soft magnetic core 42 are positioned by a positioning pin 10a provided on the floor 10 and a recessed member 35.

[0053] Also, as shown in FIG. 4, the spacer member 35 has an annular convex portion 35a. The convex portion 35a is fitted to the inner peripheral surfaces of the first end portion 421a and the second end portion 422a of the soft magnetic core 42. Further, the soft magnetic core 42 is positioned at two locations, namely, the spacer member 35 and the positioning pin 10a. With such a configuration, the soft magnetic core 42 can be assembled to the floor 10 with high positional accuracy. As a result, the positional accuracy of the soft magnetic core 42 with respect to the permanent magnet 41 can be improved. Here, the soft magnetic core 42 is made of a magnetic material, and its magnetic properties may deteriorate when a strong stress is applied. For example, if the soft magnetic core 42 is directly fastened to the floor 10 with screws or the like, the magnetic properties may deteriorate. Therefore, in the present embodiment, the fitting of the positioning pin 10a and the spacer member 35 is positioned with a clearance fit, and the soft magnetic core 42 is fixed to the support member 33 by the pipe 33a and the screw 33b, thereby achieving both positioning and fixing of the soft magnetic core 42. By adopting such a configuration, the positional accuracy of the soft magnetic core 42 can be improved without deteriorating the magnetic properties of the soft magnetic core 42. Also, in the present embodiment, the soft magnetic core 42 is arranged to be fixed to the support member 33, but a configuration may be adopted in which the permanent magnet 41 corresponding to the soft magnetic core 42 is arranged between the tension ring 31 and the floor 10, and the soft magnetic core 42 is directly fastened to the floor 10 with screws or the like.

[0054] Among the components assembled to the floor 10, components such as the support member 33, the beard holder 34, the spacer member 35, the beard spring 32, and the tension ring 31, which are close to the permanent magnet 41 excluding the soft magnetic core 42, are desirably made of a non-magnetic material so as not to be affected by the forward and reverse rotational movements of the speed control mechanism 30 and the back electromotive voltage generated by the coil 43 described later.

[0055] Further, as shown in FIG. 5, the soft magnetic core 42 includes a first welding portion 423 which is a first separating portion that separates the magnetic coupling between the first end portion 421a and the second end portion 422a, and a second welding portion 424 which is a second separating portion that separates the magnetic coupling between the first end portion 421a and the second end portion 422a and is disposed opposite to the first welding portion 423 via the permanent magnet 41. Note that the first welding portion 423 and the second welding portion 424 may be formed in a gap that physically separates the first end portion 421a and the second end portion 422a.

[0056] The permanent magnet 41 is in a magnetically balanced position when the magnetization direction is orthogonal to the opposing direction between the first welding portion 423 and the second welding portion 424. In the present embodiment, the magnetically balanced position of the permanent magnet 41 is set as the rotation angle 0°. At this position, the holding torque of the permanent magnet 41 is substantially 0. Note that the opposing direction between the first welding portion 423 and the second welding portion 424 is the direction in which a straight line connecting the first welding portion 423 and the second welding portion 424 extends, as shown in FIG. 5.

[0057] When the rotation angle of the permanent magnet 41 is shifted by 90° in the positive direction from 0°, the magnetization direction becomes the same as the opposing direction between the first welding portion 423 and the second welding portion 424. At this position, the holding torque of the permanent magnet 41 is substantially 0. The thick dashed-line graph in FIG. 7 shows the holding torque of the permanent magnet 41 due to the formation of the first welding portion 423 and the second welding portion 424.

[0058] As shown in FIG. 5, in the present embodiment, notches are formed on the inner peripheral surfaces of the first end portion 421a and the second end portion 422a of the soft magnetic core 42. Specifically, notches n11 and n12 are formed on the first end portion 421a. Further, on the second end portion 422a, a notch n21 is formed opposite to the notch n11 via the permanent magnet 41, and a notch n22 is formed opposite to the notch n12 via the permanent magnet 41. By forming the notches in this way, the magnetic influence received by the permanent magnet 41 from the soft magnetic core 42 is reduced. Therefore, the holding torque of the permanent magnet 41 can be reduced.

[0059] One of the dashed graphs in Fig. 7 shows the holding torque of the permanent magnet 41 formed by the formation of the notches n11 and n21 arranged opposite to each other, and the other dashed graph shows the holding torque of the permanent magnet 41 formed by the formation of the notches n12 and n22 arranged opposite to each other.

[0060] Also, the solid line graph in Fig. 7 shows the combined holding torque formed by combining the above three dashed graphs. That is, the solid line graph in Fig. 7 shows the holding torque of the permanent magnet 41 due to the formation of the first welding part 423, the second welding part 424, the notches n11, n12, n21, and n22 in the soft magnetic core 42. As shown in Fig. 7, in the configuration of the present embodiment, the holding torques shown by the respective dashed graphs cancel each other out at each rotation angle, and the combined holding torque of the permanent magnet 41 is close to 0 at any rotation angle. For this reason, even when the beard-shaped hairspring 32 made of a material with a low Young's modulus is used as described later, the permanent magnet 41 can be rotated smoothly. Note that the number, arrangement, and shape of the notches shown in Fig. 5 are merely examples and are not limited thereto. At least a pair of notches facing each other that reduce the holding torque of the permanent magnet 41 may be formed at the first end portion 421a and the second end portion 422a.

[0061] [Overview of the overall configuration: Overview of the pace adjustment] As shown in Fig. 8, in addition to the power spring 11, the wheel train 12, the escapement mechanism 20, the speed control mechanism 30, and the pace adjustment means 40 described above, the mechanical clock 1 includes a rectifier circuit 50, a power supply circuit 60, and a crystal oscillator 70. Also, as shown in Fig. 8, in addition to the permanent magnet 41, the soft magnetic core 42, and the coil 43 described above, the pace adjustment means 40 includes a control circuit 44, a rotation detection circuit 45, a speed control pulse output circuit 46, a frequency division circuit 47, and an oscillation circuit 48. Note that the configuration of the pace adjustment means 40 shown in Fig. 8 is merely an example. The pace adjustment means 40 does not necessarily need to include each circuit shown in Fig. 8 independently, and any means capable of realizing each function described below may be used.

[0062] The control circuit 44 is a circuit that controls the operations of the respective circuits included in the pace adjustment means 40.

[0063] The oscillation circuit 48 outputs a predetermined oscillation signal based on the oscillation frequency of the crystal oscillator 70. Note that the oscillation frequency of the crystal oscillator 70 is 32768 [Hz]. The frequency division circuit 47 divides the oscillation signal output from the oscillation circuit 48. The frequency division circuit 47 generates a reference signal OS that is output approximately every 1000 [ms] by dividing the oscillation signal based on the crystal oscillator 70. However, it is not limited to this, and the reference signal OS may be output every 2000 [ms] or every 3000 [ms]. That is, the reference signal OS may be output every exact second. Also, it is not limited to this, and the reference signal OS may correspond to the period of the speed governor mechanism 30.

[0064] The rotation detection circuit 45 detects a detection signal based on the voltage waveform generated in the coil 43 due to the movement of the permanent magnet 41. The speed regulation pulse output circuit 46 outputs a speed regulation pulse based on the reference signal generated by the frequency division circuit 47 and the detection signal detected by the rotation detection circuit 45. Specifically, the detection timing of the detection signal detected by the rotation detection circuit 45 is compared with the output timing of the reference signal of approximately 1000 [Hz]. When there is a deviation in their timings, the speed regulation pulse output circuit 46 outputs a speed regulation pulse so as to make the period in which the detection signal is detected approach 1000 [ms] (= 1 second).

[0065] The output of the speed regulation pulse is performed by energizing the coil 43. Therefore, when the period in which the detection signal is detected is earlier than the reference signal, the speed regulation pulse output circuit 46 energizes the coil 43 so that torque acts in the direction of slowing down the movement of the permanent magnet 41. When the period in which the detection signal is detected is later than the reference signal, the speed regulation pulse output circuit 46 may energize the coil 43 so that torque acts in the direction of accelerating the movement of the permanent magnet 41. Details of the step adjustment control including the output timing of the speed regulation pulse will be described later.

[0066] [Overview of the overall configuration: Speed governor mechanism 30 as a generator] In addition, the mechanical clock 1 has a power generation function using the principle of electromagnetic induction. In this embodiment, the speed regulating mechanism 30 functions as part of the generator. Specifically, as the ten-ring 31 rotates forward and backward, the permanent magnet 41 rotates forward and backward, and power generation is performed by the current generated in the coil 43 based on the change in the magnetic field due to the movement of the permanent magnet 41. The power supply circuit 60 is activated using the electric power extracted by such an operating principle. When the power supply circuit 60 is activated, the control circuit 44 included in the pace adjustment means 40 can be driven. By adopting such a configuration, in this embodiment, the control circuit 44 can be driven without separately providing a power source such as a battery.

[0067] The rectifier circuit 50 rectifies the current generated in the coil 43 due to the movement of the permanent magnet 41 accompanying the forward and reverse rotational movements of the ten-ring of the speed regulating mechanism 30. The power supply circuit 60 is a circuit including, for example, a capacitor, and stores the electric power for driving the control circuit 44 based on the current rectified by the rectifier circuit 50.

[0068] [Regarding the slowdown of the ten-ring 31] Here, in the mechanical clock 1, the faster the movement of the ten-ring 31, that is, the faster the operating cycle of the ten-ring 31, the more easily each mechanism (for example, the escape wheel 21 and the anchor 22) that transmits power wears out, and the durability decreases. On the other hand, since the amount of current generated in the coil 43 is proportional to the angular velocity of the permanent magnet 41, when the movement of the ten-ring 31 is slow, the amount of power generation required to drive the control circuit 44 cannot be obtained.

[0069] Therefore, in this embodiment, a configuration is adopted that can slow down the movement of the ten-ring 31 and ensure the amount of power generation.

[0070] FIG. 10 is a perspective view showing the operation of the tent ring of the present embodiment. In FIG. 10, the tent ring 31, the ankle 22, the permanent magnet 41, and the air resistance member 15 described later are shown. In FIG. 10, reference numerals are omitted except for the figure showing the state of the rotation angle of 0°. FIG. 12 is a diagram for explaining the relationship between the operation of the tent ring in the present embodiment and the back electromotive voltage generated in the coil. In the upper graph of FIG. 12, the vertical axis represents the angular velocity [rad / s] of the tent ring 31, and the horizontal axis represents the measurement time [s]. In the middle graph of FIG. 12, the vertical axis represents the rotation angle [deg] of the tent ring 31, and the horizontal axis represents the measurement time [s]. In the lower graph of FIG. 12, the vertical axis represents the back electromotive voltage [V] generated in the coil 43, and the horizontal axis represents the measurement time [s]. In each graph shown in FIG. 12, an example in which the movement of the tent ring 31 (permanent magnet 41) is measured for 4 seconds is shown.

[0071] In the present embodiment, the tent ring 31 is designed to perform one reciprocating operation in 2 seconds. For this purpose, a resin material with a low Young's modulus is adopted as the material of the whisker 32. As a result, it is possible to realize the low-speed vibration of the tent ring 31 as compared with the case where it is made of a metal material. If it is attempted to realize the low-speed vibration with a metal whisker, the cross-sectional area of the whisker 32 has to be reduced to a level where processing is difficult, or the length of the whisker has to be increased to a level where handling is difficult.

[0072] In this embodiment, a resin with a Young's modulus of about 5 [GPa] was used as the material for the mustache spring 32. Specifically, polyester was used as the material for the mustache spring 32. Note that the mustache spring 32 made of a resin material may be manufactured by, for example, laser processing. The Young's modulus of a general metal mustache spring is about 200 [GPa]. The Young's modulus shown here is an example, and the Young's modulus of the mustache spring 32 is preferably 20 [GPa] or less. That is, the Young's modulus of the mustache spring 32 is preferably 1 / 10 or less of the Young's modulus of a metal mustache spring. More preferably, the Young's modulus of the mustache spring 32 is 10 [GPa] or less. That is, the Young's modulus of the mustache spring 32 is preferably 1 / 20 or less of the Young's modulus of a metal mustache spring. Also, the Young's modulus may be 20 [GPa] or less, and the mustache spring 3 may be made of a material such as paper or wood. Details of the shape of the mustache spring 32 will be described later with reference to FIGS. 11M to 11O.

[0073] In this embodiment, the rotation angle [deg] of the tension ring 31 and the permanent magnet 41 in the state where the mustache spring 32 is at the neutral position of elastic deformation was set to 0°. In other words, the neutral position of the elastic deformation of the mustache spring 32 is the position where the mustache spring 32 is at its natural length. Also, in the state where the mustache spring 32 is at the neutral position of elastic deformation, power from the power spring 11 is supplied to the tension ring 31. That is, the tension ring 31 and the permanent magnet 41 are at the power supply position where power from the power spring 11 is supplied at the position where the rotation angle is 0°. Also, as described above, in this embodiment, the permanent magnet 41 is at the magnetic balance position at the position of the rotation angle 0°.

[0074] In addition, in the present embodiment, the tenon ring 31 is designed to be driven in the range of a rotation angle of 340° to -340°. Therefore, the permanent magnet 41 is also driven in the range of a rotation angle of 340° to -340°. However, this is just an example, and the movement range of the tenon ring 31 may be in the range of a rotation angle of 270° to -270° or more. By increasing the movement range of the tenon ring 31 to a certain extent in this way, low-speed vibration of the tenon ring 31 can be realized.

[0075] In addition, in FIG. 10, the state of the tenon ring 31 rotating in the positive direction from the position of the rotation angle of 0° is shown every 45° or 90°. In FIG. 10, only the state of the tenon ring 31 at a positive angle (0° to 340°) is shown, and the illustration of the state at a negative angle is omitted.

[0076] [Regarding the low speed of the tenon ring 31: Air resistance member 15] Furthermore, in the present embodiment, an air resistance member 15, which is a deceleration means, is assembled to the floor 10, and a configuration is adopted in which a portion to be acted on 313 that receives air resistance from the air resistance member 15 is formed in a part of the circumferential direction of the tenon ring 31. FIG. 9 is an exploded perspective view showing the state of the air resistance member disassembled from the floor.

[0077] The tenon ring 31 includes a circular portion 312 that rotates forward and backward around the tenon center 311, and a portion to be acted on 313 that protrudes in the radial direction in a part of the circumferential direction of the circular portion 312. In the present embodiment, the portion to be acted on 313 is the portion with the longest length in the radial direction of the tenon ring 31. Also, in the present embodiment, as shown in FIG. 10, the shape of the portion to be acted on 313 is fan-shaped.

[0078] The air resistance member 15 has a resistance wall that forms an air resistance region AR that generates air resistance. Specifically, the air resistance member 15 includes a first wall portion 151 facing one surface of the actuated portion 313 of the tension ring 31, a second wall portion 152 facing the other surface of the actuated portion 313 of the tension ring 31, and a third wall portion 153 connecting the first wall portion 151 and the second wall portion 152. The air resistance region AR is formed by these wall portions. Further, the air resistance member 15 has a base portion 154 that is integral with the first wall portion 151, the second wall portion 152, and the third wall portion 153 and is fixed to the floor 10.

[0079] The air resistance member 15 is fixed to the floor 10. In the present embodiment, as shown in FIG. 9, an opening 10b is formed in a part of the floor 10, the air resistance member 15 is fitted into the opening 10b, and the base portion 154 is fixed to the floor 10 by a fixture such as a bolt. The air resistance member 15 may be fitted into the opening 10b from the side opposite to the side where the drive mechanism, the forward / reverse mechanism 20, the speed control mechanism 30, etc. are incorporated in the floor 10. That is, the base portion 154 may be fixed to the surface of the floor 10 on the side opposite to the side where the drive mechanism, the forward / reverse mechanism 20, the speed control mechanism 30, etc. are incorporated. In FIG. 9, an example in which an opening 10b is formed in a part of the floor 10 is shown, but the present invention is not limited to this, and any structure having a hole penetrating from one side to the other side of the floor 10 may be used. For example, instead of the opening 10b, a notch into which the air resistance member 15 is fitted may be formed in the floor 10.

[0080] In this embodiment, the air resistance member 15 is provided in a predetermined direction with respect to the tent cord 311, and when the rotation angle of the tent wheel 31 is between 135° and 225° (the intermediate period in the forward and reverse movements), the actuated portion 313 is arranged to be located within the air resistance region AR. That is, the actuated portion 313 of the tent wheel 31 receives air resistance when the rotation angle of the tent wheel 31 is between 135° and 225°, and the angular velocity does not decrease. Although not shown in the figure, similarly, the actuated portion 313 of the tent wheel 31 receives air resistance when the rotation angle of the tent wheel 31 is between -135° and -225° (the intermediate period in the forward and reverse movements), and the angular velocity decreases.

[0081] The rotational speed of the tent wheel 31 passing through the air resistance region AR decreases because the escape path of the air is blocked by the first wall portion 151, the second wall portion 152, and the third wall portion 153, air stays in the air resistance region AR, and the staying air hinders the movement of the tent wheel 31.

[0082] As shown at the timing before the measurement time reaches 2.0 seconds in the upper and middle graphs of FIG. 12, the angular velocity of the tent wheel 31 rapidly increases from the position where the rotation angle of the tent wheel 31 is 0°, and reaches a peak at the timing of the measurement time of 2.0 seconds. This is because the tent wheel 31 receives power from the power spring 11 when the rotation angle of the tent wheel 31 is 0°.

[0083] The tent wheel 31 rotates in the positive direction from the rotation angle of 0°, and its angular velocity gradually decreases. The angular velocity becomes 0 at the position where the rotation angle is 340°, which is the turning point of the forward and reverse rotational movements. After that, the tent wheel 31 rotates in the reverse direction along with the elastic deformation of the whisker spring 32 from the position where the rotation angle is 340°.

[0084] Since the tent wheel 31 receives air resistance from the air resistance member 15 when the rotation angle is between 135° and 225° as described above, the angular velocity during that period decreases. Therefore, as shown in the middle graph of FIG. 12, the displacement of the rotation angle of the tent wheel 31 becomes gentle while rotating from the rotation angle of 340° to the rotation angle of 0° in the reverse direction.

[0085] Then, the cam wheel 31 returns to the position of the rotation angle 0° again, receives the power from the power spring 11, and the angular velocity in the reverse direction rapidly increases and reaches a peak. The angular velocity in the reverse rotation of the cam wheel 31 gradually decreases, and the angular velocity becomes 0 at the position of the rotation angle -340° (measurement time 3.0 seconds). After that, the cam wheel 31 rotates in the forward direction along with the elastic deformation of the beard spring 32 from the position of the rotation angle -340°.

[0086] Here, since the cam wheel 31 includes the actuated portion 313 protruding in the radial direction, the center of gravity position of the cam wheel 31 will shift toward the actuated portion 313 side from the camshaft 311 (rotation center). In a configuration where the center of gravity position is deviated from the camshaft 311 at the center position of the cam wheel 31, the rotational movement of the cam wheel 31 becomes unstable. Therefore, in the present embodiment, an opening 312h is formed in a part of the circular portion 312 so that the center of gravity position of the cam wheel 31 coincides with or approaches the camshaft 311 (center position). As shown in FIG. 10, the opening 312h is formed so as to be adjacent to the actuated portion 313 in the circumferential direction. By adopting such a configuration, the rotational movement of the cam wheel 31 is less likely to become unstable. In particular, even when the posture of the mechanical watch 1 is displaced, the cam wheel 31 can be stably rotated.

[0087] In the present embodiment, the air resistance member 15 is arranged such that when the rotation angle of the cam wheel 31 is between 135° and 225°, the actuated portion 313 is located within the air resistance region AR. Further, the air resistance region AR is arranged such that the center position 15C thereof in the circumferential direction (see FIG. 6) overlaps with the positions of 180° and -180° of the cam wheel 31 in the rotation direction of the cam wheel 31. Thereby, the air resistance received by the actuated portion 313 is symmetric when the cam wheel 31 rotates in the forward direction and when it rotates in the reverse direction. Therefore, as shown in the middle graph of FIG. 12 described later, the angular velocity of the cam wheel 31 is symmetric when it rotates in the forward direction and when it rotates in the reverse direction.

[0088] [Modification Example of the Structure for Reducing the Angular Velocity of the Cam Wheel 31] Here, with reference to FIGS. 11A to 11J, a modification of the structure for reducing the angular velocity of the tension ring 31 will be described. FIGS. 11A to 11I are perspective views showing the tension ring and the air resistance member in a modification of the present embodiment. FIG. 11J is a perspective view showing the tension ring and the elastic member in a modification of the present embodiment.

[0089] The tension ring 31 shown in FIG. 11A is provided with three notches 313A in the actuated portion 313 of the tension ring 31 shown in FIG. 10 so that a resistance wall intersecting the circumferential direction is formed. The notches 313A are formed so as to pass through the air resistance region AR as the tension ring 31 rotates.

[0090] The tension ring 31 shown in FIG. 11B is provided with three grooves 313B extending in the radial direction in the actuated portion 313 of the tension ring 31 shown in FIG. 10 so that a resistance wall intersecting the circumferential direction is formed. The grooves 313B are formed so as to pass through the air resistance region AR as the tension ring 31 rotates.

[0091] The tension ring 31 shown in FIG. 11C is provided with three through holes 313C in the actuated portion 313 of the tension ring 31 shown in FIG. 10 so that a resistance wall intersecting the circumferential direction is formed. The through holes 313C are formed so as to pass through the air resistance region AR as the tension ring 31 rotates.

[0092] By adopting the actuated portion 313 shown in FIGS. 11A to 11C, when the actuated portion 313 passes through the air resistance region AR, the rectification of the air in the air resistance region AR is disturbed, and the air resistance received by the actuated portion 313 increases. Thereby, the speed of the actuated portion 313 passing through the air resistance region AR can be made lower.

[0093] Note that the configuration of the tension ring 31 shown in FIGS. 11A to 11C is an example, and it is not limited to these as long as it has a shape having a recess in which a resistance wall for increasing air resistance is formed. That is, the position and number where notches or the like are formed are not limited to those shown in the drawings.

[0094] In FIG. 11D, an example is shown in which, excluding the third wall portion 153 of the air resistance member 15 shown in FIG. 10, the first wall portion 151 and the second wall portion 152 are provided inside the track of the acted-upon portion 313 in the radial direction. That is, the air resistance member 15 forms the air resistance region AR only with the first wall portion 151 and the second wall portion 152 facing each other. Note that the first wall portion 151 and the second wall portion 152 may be independently assembled to the floor 10 or the like, respectively.

[0095] Also, in FIG. 11D, the acted-upon portion 313 protrudes inward in the radial direction. For this reason, the acted-upon portion 313 passes through the air resistance region AR as the tension ring 31 rotates. According to the configuration shown in FIG. 11D, an increase in the size of the tension ring 31 and the air resistance member 15 in the radial direction can be suppressed.

[0096] FIG. 11E shows an example in which the acted-upon portion 313 is provided at a position different from that of the circular portion 312 in the axial direction of the tension cord 311. Also, the air resistance member 15 is provided at a position where the acted-upon portion 313 can pass through the air resistance region AR in the axial direction of the tension cord 311.

[0097] Also in FIG. 11F, similar to the modification shown in FIG. 11E, the acted-upon portion 313 is provided at a position different from that of the circular portion 312 in the axial direction of the tension cord 311. Also, the air resistance member 15 is provided at a position where the acted-upon portion 313 can pass through the air resistance region AR in the axial direction of the tension cord 311. Furthermore, the circular portion 312 of the tension ring 31 has a semi-circular shape. For this reason, the tension ring 31 is lightweight.

[0098] In the examples shown in FIGS. 11E and 11F, by providing the acted-upon portion 313 at a position different from that of the circular portion 312 in the axial direction, the center-of-gravity position of the tension ring 31 can be adjusted.

[0099] In FIG. 11G, an example is shown in which the diameter of the circular portion 312 is made smaller than that of the tension ring 31 shown in FIG. 10, and the thickness at the position facing the actuated portion 313 through the tension string 311 is increased. That is, the weight of the circular portion 312 at the position facing the actuated portion 313 through the tension string 311 is increased. With such a configuration, the center of gravity position of the tension ring 31 can be aligned with the tension string 311 (the center position of the tension ring 31). Further, in the configuration of FIG. 11G in which the diameter of the tension ring 31 is reduced, an advantage is obtained in that the degree of freedom in the layout of the beard holder 34 that fixes the outer end of the beard saw 32 is improved.

[0100] In FIG. 11H, an example is shown in which the air resistance member 15 does not have the first wall portion 151 and the second wall portion 152 and includes only a configuration corresponding to the third wall portion 153. That is, the air resistance member 15 in FIG. 11H includes a base portion 154 and a third wall portion 153 that stands up from the base portion 154 and has a shape along the rotation locus of the tension ring 31.

[0101] In FIG. 11I, an example is shown in which a groove 153I, which is a recess forming a resistance wall intersecting the circumferential direction of the tension ring 31, is formed in the air resistance member 15 shown in FIG. 11H. A plurality of grooves 153I are formed along the axial direction of the tension string 311. With such a configuration, compared with FIG. 11H, the air resistance acting on the actuated portion 313 passing through the air resistance region AR can be increased.

[0102] FIG. 11J is an example in which a configuration is adopted to reduce the speed of the tension ring 31 by contact resistance (frictional resistance) instead of air resistance. Specifically, the tension ring 31 has protrusions 316 formed on the circular portion 312 as an actuated portion. Further, an elastic member is adopted as the frictional resistance portion.

[0103] Specifically, a first elastic member 151J that the protrusion 316 contacts when the tension ring 31 is located at a rotation angle of 135° and a second elastic member 152J that the protrusion 316 contacts when the tension ring 31 is located at a rotation angle of 225° are provided. The ends of the first elastic member 151J and the second elastic member 152J are preferably fixed to the floor 10.

[0104] The first elastic member 151J and the second elastic member 152J are elastically deformed while generating frictional resistance with the protrusion 316 when the protrusion 316 of the tension ring 31 comes into contact therewith. While the tension ring 31 is in contact with the protrusion 316, the speed is decelerated due to the frictional resistance. In the example shown in FIG. 11J, the region through which the protrusion 316 passes while contacting the first elastic member 151J and the second elastic member 151J becomes the resistance region R1.

[0105] Note that the configurations shown in FIGS. 10 and 11A to 11J are merely examples, and any configuration that acts on the tension ring 31 during the intermediate period of forward and reverse movements to decelerate the tension ring 31 is acceptable, and the present invention is not limited to the illustrated examples.

[0106] Furthermore, with reference to FIGS. 11K and 11L, another example of the tension ring 31 will be described. FIG. 11K is a perspective view showing the tension ring of another example as viewed from the side where the beard trimmer is provided. FIG. 11L is a perspective view showing the tension ring shown in FIG. 11K as viewed from the side opposite to the side where the beard trimmer is provided.

[0107] The tension ring 31 shown in FIGS. 11K and 11L has a circular portion 312 and an acted-on portion 313, similar to those shown in FIG. 10 and the like. An opening 312h is formed in the circular portion 312 at a position overlapping the acted-on portion 313 in the circumferential direction.

[0108] Furthermore, in the tension ring 31 shown in FIGS. 11K and 11L, the edge portion 312a of the circular portion 312 protrudes in the axial direction of the tension tape 311. That is, the edge portion 312a is thicker than the inner portion of the circular portion 312 inside the edge portion 312a. The acted-on portion 313 is formed flush with the edge portion 312a. That is, the thickness of the acted-on portion 313 is the same as that of the edge portion 312a and is thicker than the inner portion of the circular portion 312 inside the edge portion 312a.

[0109] In the tent ring 31 shown in FIGS. 11K and 11L, since the thickness of the actuated portion 313 is relatively thick, the surface of the actuated portion 313 that receives air resistance is relatively wide. Therefore, the amount of air pushed away by the actuated portion 313 within the air resistance region AR shown in FIG. 10 can be increased, making it easier to prevent the movement of the tent ring 31 and making it easier to reduce the speed. Note that since the beard spring 32 is disposed on a portion of the tent ring 31 other than the edge portion 312a and the actuated portion 313 that has a relatively thin thickness, it is possible to reduce the total thickness of the beard spring 32 and the tent ring 31 in the axial direction of the tent film 311.

[0110] Furthermore, as shown in FIG. 11L, the thickness of a part of the surface of the circular portion 312 of the tent ring 31 on the side opposite to the side where the beard spring 32 is provided is made thicker. When the thickness of the actuated portion 313 is increased, the weight of the actuated portion 313 becomes heavier, so that the center of gravity of the tent ring 31 shifts toward the actuated portion 313 side. However, by making a part of the thickness of the circular portion 312 thicker, the position of the center of gravity of the tent ring 31 can be adjusted to match the tent film 311 (the center position of the tent ring 31).

[0111] Furthermore, referring to FIGS. 11M to 11O, the details of the beard spring 32 will be described. FIG. 11M is a plan view showing a state where the beard spring is in its neutral position of elastic deformation. FIG. 11N is a plan view showing a state where the beard spring is elastically deformed in the expanding direction from the neutral position. FIG. 11O is a plan view showing a state where the beard spring is elastically deformed in the contracting direction from the neutral position.

[0112] The beard spring 32 has an outer end portion 321 connected to the beard holder 34 and an inner end portion 322 connected to the tent film 311. The inner end portion 322 is annular along the circumferential surface of the tent film 311. The outer end portion 321 and the inner end portion 322 are thicker than other portions (portions that elastically deform) of the beard spring 32. For this reason, the connection strength to the beard holder 34 and the tent film 311 is maintained.

[0113] By increasing the overall length of the mustache spring 32 and reducing the spring force of the mustache spring 32, it is possible to achieve reduced vibration. When the overall length of the mustache spring 32 is increased, the diameter of the mustache spring 32 will become larger. In order to increase the overall length while miniaturizing the mustache spring 32, it is advisable to shorten the distance between the inner part and the outer part of the mustache spring 32. That is, it is advisable to narrow the pitch of the mustache spring 32.

[0114] In the case of the mustache spring 32, a shape using a logarithmic spiral is adopted. As described above, by performing laser processing, it is possible to easily fabricate a mustache spring with a logarithmic spiral. By adopting a shape using a logarithmic spiral, compared with the Archimedes spiral with an equal pitch, which is a commonly used shape for mustache springs, the distance between the pitches of the mustache spring 32 on the inner end portion 322 side can be reduced, the overall length of the mustache spring can be increased, and the diameter can be reduced. As a result, while reducing the diameter of the mustache spring 32, the spring force can be decreased, and reduced vibration can also be achieved. However, when the mustache spring 32 is fabricated by laser processing as described above, it is difficult to narrow the pitch. This is because the shape of the mustache spring 32 may be deformed by the heat of the laser light.

[0115] Therefore, in order to narrow the pitch while maintaining the dimensional accuracy of the mustache spring 32, as shown in FIGS. 11M to 11O, a configuration is adopted in which the inner end portion 322 includes a fixed portion 322a and a pitch-expanded portion 322b. The fixed portion 322a is a portion fixed to the film 311. The pitch-expanded portion 322b is a portion narrower in width than the fixed portion 322a, and is a portion that expands the pitch between the inner end portion 322 of the mustache spring 32 and the adjacent portion 323 in the radial direction. The portion 323 adjacent to the inner end portion 322 of the mustache spring 32 in the radial direction is a portion other than the inner end portion 322 and is the innermost arranged portion. W shown in FIGS. 11M to 11O indicates the distance between the inner end portion 322 and the portion 323 adjacent to the inner end portion 322 in the radial direction.

[0116] In FIGS. 11M to 11O, an example where the inner end portion 322 is annular, that is, an example where the fixing portion 322a and the pitch expanding portion 322b are connected, is shown. However, the present invention is not limited to this. For example, a part of the inner end portion 322 may be separated in the circumferential direction, and the separated portion may function as the pitch expanding portion 322b. However, it is easier to ensure the fixing strength with respect to the film 311 when the inner end portion 322 is annular. In FIGS. 11M to 11O, an example where the beard saw 32 has a shape using a logarithmic spiral is shown. However, the present invention is not limited to this, and the configuration for forming the pitch expanding portion 322b is particularly effective in a beard saw having a shape in which the pitch is narrower on the inner side of the diameter than on the outer side of the diameter.

[0117] [Regarding the timing of power generation] The amount of current generated in the coil 43 due to the movement of the permanent magnet 41 increases in proportion to the angular velocity of the permanent magnet 41. Therefore, in order to efficiently generate power, it is preferable to use the current generated in the coil 43 when the angular velocity of the permanent magnet 41 is high.

[0118] Therefore, in the present embodiment, power generation is performed based on the current corresponding to the back electromotive force (detection voltage) detected by the coil 43 due to the movement of the permanent magnet 41 at the timing when the permanent magnet 41 (ten-ring 31) is at the position of 0° or immediately after that. That is, as shown in the lower graph of FIG. 12, power generation is performed at the timing when the back electromotive force detected by the coil 43 reaches a peak.

[0119] Note that the timing for power generation is not limited to the timing when the ten-ring 31 is at the position of the rotation angle 0° or immediately after that. As long as it is before the acting portion 313 (ten-ring 31) reaches the position of the air resistance member 15 in either the forward or reverse rotational movement of the ten-ring 31. That is, power generation may be performed based on the current corresponding to the back electromotive force detected by the coil 43 during the period before the angular velocity of the ten-ring 31 decreases due to the air resistance received by the acting portion 313 from the air resistance member 15.

[0120] As shown in the graph at the lower part of FIG. 12, in this embodiment, the voltage waveforms detected during the forward and reverse movements of the ten-ring 31 are the same. Therefore, in the mechanical watch 1, it is not necessary to grasp in which direction, forward or reverse, the ten-ring 31 is moving in order to align the power generation timing.

[0121] [Relationship between the magnetization direction of the permanent magnet 41 and the power generation efficiency] Here, with reference to FIGS. 5, 12, 13A to 13C, the relationship between the magnetization direction of the permanent magnet 41 and the power generation efficiency will be described.

[0122] In the mechanical watch 1 according to this embodiment, power generation is performed based on the power obtained by rectifying the current corresponding to the back electromotive voltage generated in the coil 43 by the rectifier circuit 50. Here, as the rectification by the rectifier circuit 50, full-wave rectification using a bridge circuit including a plurality of diodes or half-wave rectification using a circuit including one diode can be considered. When a plurality of diodes are used, a voltage drop occurs according to the number of diodes, resulting in a loss in the obtained power. Therefore, in this embodiment, a configuration in which the rectifier circuit 50 performs half-wave rectification is adopted. Also, in half-wave rectification, a difference is provided in the shapes of the positive and negative back electromotive voltages, and by performing power generation based on the back electromotive voltage with the larger absolute value, efficient power generation can be achieved. Therefore, in this embodiment, the permanent magnet 41 is arranged so that a back electromotive voltage suitable for half-wave rectification is detected.

[0123] FIG. 13A shows the back electromotive voltage detected by the coil 43 in the arrangement of the permanent magnet 41 of this embodiment. FIG. 13B shows the back electromotive voltage detected by the coil 43 in the arrangement of the permanent magnet 41 of Comparative Example 1. FIG. 13C shows the back electromotive voltage detected by the coil 43 in the arrangement of the permanent magnet 41 of Comparative Example 2.

[0124] [Relationship between the magnetization direction of the permanent magnet 41 and the power generation efficiency: This embodiment] In this embodiment, the permanent magnet 41 is arranged such that the magnetization direction is orthogonal to the facing direction between the first welding portion 423 and the second welding portion 424 in a state where the bristle spring 32 is at the neutral position of its elastic deformation.

[0125] Here, the rotation angle of the permanent magnet 41 performs a rotational movement in the positive direction from the position of 0°, performs a rotational movement in the reverse direction by the elastic force of the bristle spring 32, and further performs a rotational movement in the positive direction by the elastic force of the bristle spring 32. The back electromotive voltage detected by the coil 43 will be described.

[0126] Also, the back electromotive voltage generated in the coil 43 due to the change in the magnetic field when the N - pole portion 411 of the permanent magnet 41 moves in the direction approaching the first end portion 421a of the soft magnetic core 42 is defined as the "positive" back electromotive voltage. On the other hand, the back electromotive voltage generated in the coil 43 due to the change in the magnetic field when the N - pole portion 411 of the permanent magnet 41 moves in the direction away from the first end portion 421a of the soft magnetic core 42 is defined as the "negative" back electromotive voltage.

[0127] In this embodiment, the permanent magnet 41 is at the position of magnetic balance when the rotation angle is 0°. Therefore, at the rotation angle of 0°, the back electromotive voltage generated in the coil 43 becomes 0. The permanent magnet 41 is supplied with power from the power spring 11 at the rotation angle of 0°. That is, the angular velocity of the permanent magnet 41 is maximum at the timing immediately after the rotation angle of 0°. Also, while the permanent magnet 41 rotates in the positive direction from the rotation angle of 0° to 180°, the N - pole portion 411 moves in the direction approaching the first end portion 421a. Thus, in this embodiment, the permanent magnet 41 is arranged such that the back electromotive voltage detected by the coil 43 has the same polarity while rotating 180° in the positive direction from the power supply position.

[0128] Therefore, while the permanent magnet 41 rotates from the rotation angle of 0° to 180°, the angular velocity of the permanent magnet 41 is maximum, and the positive back electromotive voltage generated in the coil 43 becomes the peak.

[0129] At the rotation angle of 180° where the permanent magnet 41 is at the position of magnetic balance, the back electromotive voltage generated in the coil 43 becomes 0.

[0130] When the permanent magnet 41 rotates in the positive direction from the rotation angle of 180°, the N - pole portion 411 moves in a direction away from the first end portion 421a. Therefore, while the permanent magnet 41 rotates from the rotation angle of 180° to 340°, a negative back - electromotive voltage is generated in the coil 43. At this time, the angular velocity of the permanent magnet 41 is smaller than the angular velocity from the rotation angle of 0° to 180°. Therefore, the absolute value of the peak of the negative back - electromotive voltage is smaller than the absolute value of the peak of the positive back - electromotive voltage.

[0131] Also, the angular velocity of the permanent magnet 41 becomes 0 at the rotation angle of 340°, which is the turning position of the reciprocating motion. Therefore, at the rotation angle of 340°, the back - electromotive voltage generated in the coil 43 becomes 0.

[0132] The permanent magnet 41 that has reached the rotation angle of 340° starts to rotate in the reverse direction due to the elastic force of the wiper 32. When the permanent magnet 41 rotates from the rotation angle of 340° to 180°, the N - pole portion 411 moves in a direction approaching the first end portion 421a. Therefore, while the permanent magnet 41 rotates from the rotation angle of 340° to 180°, a positive back - electromotive voltage is generated in the coil 43.

[0133] Also, at the rotation angle of 180° where the permanent magnet 41 is at the magnetic balance position, the back - electromotive voltage generated in the coil 43 becomes 0.

[0134] Furthermore, the permanent magnet 41 rotates from the rotation angle of 180° to 0°. When the permanent magnet 41 rotates from the rotation angle of 180° to 0°, the N - pole portion 411 moves in a direction away from the first end portion 421a. Therefore, when the permanent magnet 41 rotates from the rotation angle of 180° to 0°, a negative back - electromotive voltage is generated in the coil 43.

[0135] Also, at the rotation angle of 0° where the permanent magnet 41 is at the magnetic balance position, the back - electromotive voltage generated in the coil 43 becomes 0.

[0136] When the permanent magnet 41 reaches the rotation angle of 0°, power is supplied from the power generator 11. That is, immediately after the rotation angle reaches 0°, the angular velocity of the permanent magnet 41 becomes maximum. Also, while the permanent magnet 41 rotates from the rotation angle of 0° to -180°, the N - pole portion 411 moves in a direction approaching the first end portion 421a. Thus, in this embodiment, the permanent magnet 41 is arranged such that the back electromotive voltage detected in the coil 43 has the same polarity during the rotation from the power supply position in the reverse direction until -180° rotation.

[0137] Therefore, while the permanent magnet 41 rotates from the rotation angle of 0° to -180°, the angular velocity of the permanent magnet 41 becomes maximum, and the positive back electromotive voltage generated in the coil 43 reaches its peak.

[0138] At the rotation angle of -180° where the permanent magnet 41 is in the magnetically balanced position, the back electromotive voltage generated in the coil 43 becomes 0.

[0139] When the permanent magnet 41 rotates in the reverse direction from the rotation angle of -180°, the N - pole portion 411 moves in a direction moving away from the first end portion 421a. Therefore, while the permanent magnet 41 rotates from the rotation angle of -180° to -340°, a negative back electromotive voltage is generated in the coil 43. At this time, the angular velocity of the permanent magnet 41 is lower than the angular velocity from the rotation angle of 0° to -180°. Therefore, the absolute value of the peak of the negative back electromotive voltage is smaller than the absolute value of the peak of the positive back electromotive voltage.

[0140] Also, the angular velocity of the permanent magnet becomes 0 at the rotation angle of -340° which is the turning position of the reciprocating motion. Therefore, at the rotation angle of -340°, the back electromotive voltage generated in the coil 43 becomes 0.

[0141] The permanent magnet 41 that has reached the rotation angle of -340° starts to rotate in the positive direction due to the elastic force of the hairspring 32. When the permanent magnet 41 rotates from the rotation angle of -340° to -180°, the N - pole portion 411 moves in a direction approaching the first end portion 421a. Therefore, while the permanent magnet 41 rotates from the rotation angle of -340° to -180°, a positive back electromotive voltage is generated in the coil 43.

[0142] Also, at the rotation angle -180° where the permanent magnet 41 is in the magnetically balanced position, the back electromotive voltage generated in the coil 43 becomes 0.

[0143] Furthermore, the permanent magnet 41 rotates from the rotation angle -180° to 0°. When the permanent magnet 41 rotates from the rotation angle -180° to 0°, the N-pole portion 411 moves in a direction away from the first end portion 421a. Therefore, when the permanent magnet 41 rotates from the rotation angle -180° to 0°, a negative back electromotive voltage is generated in the coil 43.

[0144] Repeating the above operations, in the arrangement of the permanent magnet 41 of the present embodiment, the back electromotive voltage of the waveform shown in FIG. 13A is generated in the coil 43. As shown in FIG. 13A, the peaks of the back electromotive voltage are different between the positive back electromotive voltage and the negative back electromotive voltage. That is, the maximum value of the absolute value of the positive back electromotive voltage is larger than the maximum value of the absolute value of the negative back electromotive voltage. Also, the waveforms of the detected back electromotive voltage are the same for the forward movement and the reverse movement of the permanent magnet 41.

[0145] [Relationship between the magnetization direction of the permanent magnet 41 and the power generation efficiency: Comparative Example 1] Next, referring to FIG. 13B, Comparative Example 1 will be described. In Comparative Example 1, the permanent magnet 41 is arranged such that the magnetization direction is inclined by 45° in the facing direction between the first welded portion 423 and the second welded portion 424 in a state where the hairspring 32 is at its neutral position of elastic deformation. That is, in Comparative Example 1, the position of the rotation angle 0° is inclined by -45° compared to the present embodiment.

[0146] In Comparative Example 1, when the permanent magnet 41 rotates in the positive direction from a rotation angle of 0°, first, the N - pole portion 411 moves in a direction away from the first end portion 421a. Then, when the permanent magnet 41 passes through a rotation angle of 45°, the N - pole portion 411 moves in a direction approaching the first end portion 421a. Therefore, while the permanent magnet 41 rotates in the positive direction from a rotation angle of 0° to 225°, a negative back - electromotive voltage is generated in the coil 43 immediately after rotation, and then, after passing through a rotation angle of 45°, a positive back - electromotive voltage is generated in the coil 43.

[0147] In Comparative Example 1, the permanent magnet 41 rotates in the positive direction from a rotation angle of 0° to 340°, rotates in the reverse direction due to the elastic force of the wiper 32, and returns to a rotation angle of 0° again. When rotating in the reverse direction from a rotation angle of 0°, the N - pole portion 411 moves in a direction approaching the first end portion 421a. That is, when the permanent magnet 41 rotates in the reverse direction from a rotation angle of 0°, a positive back - electromotive voltage is generated in the coil 43.

[0148] Thus, in Comparative Example 1, in both the forward and reverse rotations, at least the waveforms of the positive and negative back - electromotive voltages are different around a rotation angle of 0°. Therefore, the magnitudes of the back - electromotive voltage peaks are different in the forward and reverse rotations. Also, since the peak positions of the back - electromotive voltage are different between the forward and reverse rotations, it is determined that the period of the forward - reverse rotational motion of the sprocket 31 is disrupted, and there is a possibility that the step adjustment is erroneously performed. Therefore, in the configuration of Comparative Example 1, the step adjustment means 40 needs to have a means for previously grasping in which direction the sprocket 31 is moving, either in the forward or reverse direction.

[0149] [Relationship between the magnetization direction of the permanent magnet 41 and the power generation efficiency: Comparative Example 2] Next, referring to FIG. 13C, Comparative Example 2 will be described. In Comparative Example 2, the permanent magnet 41 is arranged such that the magnetization direction is the same as the facing direction between the first welded portion 423 and the second welded portion 424 in a state where the hairspring 32 is at its neutral position of elastic deformation. That is, in Comparative Example 2, the position of the rotation angle 0° is inclined by -90° compared to the present embodiment.

[0150] In Comparative Example 2, when the permanent magnet 41 rotates in the positive direction from the rotation angle 0°, first, the N - pole portion 411 moves in a direction away from the first end portion 421a. Then, when the permanent magnet 41 passes through the rotation angle 90°, the N - pole portion 411 moves in a direction approaching the first end portion 421a. Therefore, while the permanent magnet 41 rotates in the positive direction from the rotation angle 0° to 180°, a negative back - electromotive voltage is generated in the coil 43 immediately after rotation, and then, after passing through the rotation angle 90°, a positive back - electromotive voltage is generated in the coil 43.

[0151] In Comparative Example 2, the permanent magnet 41 rotates in the positive direction from the rotation angle 0° to 340°, rotates in the reverse direction due to the elastic force of the hairspring 32, and returns to the rotation angle 0° again. When rotating in the reverse direction from the rotation angle 0°, the N - pole portion 411 moves in a direction approaching the first end portion 421a. That is, when the permanent magnet 41 rotates in the reverse direction from the rotation angle 0°, a positive back - electromotive voltage is generated in the coil 43.

[0152] Thus, in Comparative Example 2, in the forward rotation and the reverse rotation, at least around the rotation angle of 0°, the waveforms of the positive back electromotive voltage and the negative back electromotive voltage are different. Therefore, the magnitudes of the peaks of the back electromotive voltage are different in the forward rotation and the reverse rotation. In the configuration of Comparative Example 2, compared with Comparative Example 1, the peak of the back electromotive voltage is smaller in the forward rotation or the reverse rotation, and it cannot be said that it is a back electromotive voltage suitable for half-wave rectification. Also, since the peaks of the back electromotive voltage are different between the forward rotation and the reverse rotation, it is necessary to vary the threshold value Vth depending on the case. As a result, similar to Comparative Example 1, the step adjustment means 40 needs to have a means for grasping in advance in which direction the tension wheel 31 is moving, whether in the forward direction or the reverse direction.

[0153] [Relationship between the magnetization direction of the permanent magnet 41 and the power generation efficiency: Summary] As described above, in the present embodiment, regardless of whether the rotation direction of the permanent magnet 41 is the forward direction or the reverse direction, a back electromotive voltage with the same waveform shape is detected. Therefore, in the present embodiment, the peaks of the positive back electromotive voltage are detected with the same magnitude and at a constant period. Also, in the present embodiment, the shapes of the positive back electromotive voltage and the negative back electromotive voltage are asymmetric. Specifically, the peak of the positive back electromotive voltage appears larger than the peak of the negative back electromotive voltage. For this reason, in the arrangement of the permanent magnet 41 in the present embodiment, it can be said that it is a back electromotive voltage with a waveform suitable for step adjustment and half-wave rectification as compared with Comparative Examples 1 and 2.

[0154] Note that the arrangement of the permanent magnet 41 shown in FIG. 5 is an example, and the permanent magnet 41 may be arranged such that its magnetization direction is the same as the facing direction between the first end portion 421a and the second end portion 422a in a state where the beard saw 32 is at its neutral position of elastic deformation. The facing direction between the first end portion 421a and the second end portion 422a is a direction orthogonal to the facing direction between the first welding portion 423 and the second welding portion 424 shown in FIG. 5. However, it is not limited to this, and the permanent magnet 41 may be arranged such that its magnetization direction faces the side of the first end portion 421a or the second end portion 422a at least in a state where the beard saw 32 is at its neutral position of elastic deformation.

[0155] Further, the permanent magnet 41 may be arranged such that the boundary B between the N - pole portion 411 and the S - pole portion 412 overlaps a virtual strip - shaped region (S shown in FIG. 5) connecting the first welding portion 423 and the second welding portion 424 in a state where the hairspring 32 is at its neutral position of elastic deformation. Note that the strip - shaped region S is a virtual region defined for convenience of showing the arrangement of the permanent magnet 41 and does not physically exist as a component of the mechanical watch 1.

[0156] [Circuit diagram] Here, with reference to FIG. 14A, an outline of the rectifier circuit in the present embodiment will be described. FIG. 14A is a circuit diagram showing an example of the circuit in the present embodiment.

[0157] In the present embodiment, a configuration is adopted in which a rectifier circuit 50 including one diode D is used to half - wave rectify the current corresponding to the back electromotive voltage generated in the coil 43 due to the movement of the permanent magnet 41. The rectifier circuit 50 is a circuit that eliminates the negative voltage portion of the back electromotive voltage generated in the coil 43 and converts it into direct current.

[0158] Transistors TP1 and TP2 are respectively connected to the first terminal O1 and the second terminal O2 of the coil 43. The back electromotive voltage generated in the coil 43 is input to the transistors TP1 and TP2, and based on this, the rotation detection circuit 45 detects a detection signal. That is, by turning on the transistors TP1 and TP2 at a predetermined timing, the induced voltages generated at the first terminal O1 and the second terminal O1 corresponding to these transistors can be taken out as a detection signal, which is a voltage signal.

[0159] Also, transistors P11 and P12 are connected to the first terminal O1 of coil 43, and transistors P21 and P22 are connected to the second terminal O2 of coil 43. Transistors P11, P12, P21, and P22 are controlled to be turned ON / OFF by the speed control pulses from the speed control pulse output circuit 46. During power generation, the gate terminals of transistors P11, P12, P21, and P22 are turned OFF. In that state, the rectifier circuit 50 is constituted by transistors TP1 and TP2 and diode D. As the permanent magnet 41 performs forward and reverse rotational movements, a current flows through coil 43, and capacitor C is charged. When capacitor C is charged to a certain extent, the power supply circuit 60 is activated. Then, when the power supply circuit 60 is activated, the control circuit 44 is activated, and the control circuit 44 controls each circuit included in the step adjustment means 40.

[0160] In the present embodiment, as shown in FIG. 14A, a configuration is adopted in which half-wave rectification is performed using the rectifier circuit 50 including one diode D. Thus, the circuit configuration can be simplified, and voltage drop can be made less likely to occur. Note that the circuit shown in FIG. 14A is an example, and as shown in FIG. 14B, a voltage doubler rectifier circuit that can also rectify the reverse electromotive force in the reverse direction may be adopted as the rectifier circuit 50. FIG. 14B shows an example of a voltage doubler rectifier circuit including two diodes D1 and D2 and two capacitors C1 and C2. In the voltage doubler rectifier circuit, the number of diodes can be made smaller compared to a full-wave rectifier circuit. That is, voltage drop can be made less likely to occur.

[0161] [Details of Step Adjustment Control] Hereinafter, with reference to FIGS. 12 and 15A to 19, the details of the step adjustment control in the present embodiment will be described. FIGS. 15A and 15B are diagrams for explaining the control of the movement of the permanent magnet by the speed control pulses in the present embodiment.

[0162] In the present embodiment, the speed control pulse output circuit 46 outputs speed control pulses to control the movement of the permanent magnet 41, thereby controlling the movement of the idler wheel 31 to perform step adjustment.

[0163] In this embodiment, as shown in FIG. 15A, when a speed adjustment pulse is output to the first terminal O1 of the coil 43, it is defined that the first end portion 421a has an S pole and the second end portion 422a has an N pole. On the other hand, as shown in FIG. 15B, when a speed adjustment pulse is output to the terminal O2 of the coil 43, it is defined that the first end portion 421a has an N pole and the second end portion 422a has an S pole. Note that when the winding direction of the coil 43 is opposite, the polarities of the first end portion 421a and the second end portion 422a are reversed.

[0164] [Details of Pace Adjustment Control: Output Timing of Speed Adjustment Pulse] Here, when the angular velocity of the permanent magnet 41 is high, it is difficult to perform pace adjustment at a desired timing. This is because when the angular velocity of the permanent magnet 41 is high, the output timing of the speed adjustment pulse is likely to deviate.

[0165] Therefore, in this embodiment, during the forward and reverse rotational movements of the permanent magnet 41, during the period when the permanent magnet 41 rotates in the reverse direction from the rotation angle of 180° to 0°, and during the period when it rotates in the forward direction from the rotation angle of -180° to 0°, a speed adjustment pulse is output. That is, a speed adjustment pulse is output during the period before the ten-ring 31 is supplied with power from the power generator 11. Thereby, a speed adjustment pulse can be output when the angular velocity of the permanent magnet 41 is relatively low. Also, in this embodiment, since the ten-ring 31 receives air resistance from the air resistance member 15 between the rotation angles of 225° and 135°, the angular velocity of the permanent magnet 41 is particularly low during the period from the rotation angle of 180° to 0°. The same applies during the period from the rotation angle of -225° to -135°. Thus, in the forward and reverse rotational movements of the ten-ring 31, pace adjustment may be performed during the period after the acted-upon portion 313 reaches the position of the air resistance member 15.

[0166] By adopting such a configuration, it is possible to suppress the deviation of the output timing of the speed control pulse. As a result, the step accuracy can be maintained. In FIG. 12, the timing for performing the step adjustment is shown in a strip-shaped region. As shown in the upper graph of FIG. 12, the step adjustment is performed during the period when the angular velocity of the permanent magnet 41 is slow.

[0167] [Details of the step adjustment control: Coil terminal where the speed control pulse is output] FIG. 15A shows an example in which a speed control pulse is output to the coil 43 at the timing when the permanent magnet 41 rotating in the forward direction is at the position of the rotation angle -90°, and at the timing when the permanent magnet 41 rotating in the reverse direction is at the position of the rotation angle 90°.

[0168] As shown in FIG. 15A, when the permanent magnet 41 rotates in the forward direction from the rotation angle -90° and a speed control pulse is output to the first terminal O1 of the coil 43, the permanent magnet 41 will receive a repulsive force from the soft magnetic core 42. That is, a brake is applied to the forward rotation of the permanent magnet 41. On the other hand, when the permanent magnet 41 rotates in the reverse direction from the rotation angle 90° and a speed control pulse is output to the first terminal O1 of the coil 43, the permanent magnet 41 will receive a repulsive force from the soft magnetic core 42. That is, a brake will be applied to the reverse rotation of the permanent magnet 41.

[0169] Also, as shown in FIG. 15B, when the permanent magnet 41 rotates in the forward direction from the rotation angle -90° and a speed control pulse is output to the second terminal O2 of the coil 43, the permanent magnet 41 will receive an attractive force from the soft magnetic core 42. That is, an accelerator is applied to the forward rotation of the permanent magnet 41. On the other hand, when the permanent magnet 41 rotates in the reverse direction from the rotation angle 90° and a speed control pulse is output to the second terminal O2 of the coil 43, the permanent magnet 41 will receive an attractive force from the soft magnetic core 42. That is, an accelerator will be applied to the reverse rotation of the permanent magnet 41.

[0170] Thus, in this embodiment, regardless of whether the permanent magnet 41 rotates in the forward or reverse direction, the rotation of the permanent magnet 41 can be weakened by outputting a speed adjustment pulse to the first terminal O1, while the rotation of the permanent magnet 41 can be strengthened by outputting a speed adjustment pulse to the second terminal O2.

[0171] That is, regardless of whether the permanent magnet 41 rotates in the forward or reverse direction, when adjusting in the direction of slowing down the step, the first terminal O1 may be energized, and when adjusting in the direction of advancing the step, the second terminal O2 may be energized.

[0172] [Details of step adjustment control: Operation flow of step adjustment control] FIG. 16 is a flowchart showing an example of the step adjustment control of this embodiment. In the following description, a signal detected by the rotation detection circuit 45 when a back electromotive voltage equal to or higher than a predetermined threshold value Vth is generated is defined as a detection signal DE. The control circuit 44 controls the speed adjustment pulse output circuit 46 based on the detection signal DE detected by the rotation detection circuit 45 and the reference signal OS generated by the frequency division circuit 47.

[0173] The timing when the detection signal DE is detected is when a large back electromotive voltage is generated in the coil 43. That is, it is when the angular velocity of the permanent magnet 41 is high. Therefore, the control circuit 44 may perform step adjustment based on the detection voltage generated in the coil 43 by the movement of the permanent magnet 41 and the reference signal OS before the actuated portion 313 reaches the position of the air resistance member 15 in both the forward and reverse movements of the ten-ring 31.

[0174] In this embodiment, after the power supply circuit 60 is activated by power generation due to the movement of the permanent magnet 41 (Y in ST1), the step adjustment control by the step adjustment means 40 is performed.

[0175] When the detection signal DE is detected within the output period of the reference signal OS (Y in ST2), that is, when there is no gait deviation, the gait adjustment control is terminated. Note that FIG. 17 is a timing chart showing an example when the detection signal is detected within the output period of the reference signal. As shown in FIG. 17, in the present embodiment, the output period of the reference signal OS is set as an output period ts having a predetermined width.

[0176] When the detection signal DE is not detected within the output period of the reference signal OS (N in ST2), that is, when a gait deviation has occurred, the control circuit 44 determines whether the detection timing of the detection signal DE is earlier than the output period of the reference signal OS (ST3).

[0177] When the detection timing of the detection signal DE is earlier than the output period of the reference signal OS (Y in ST3), the control circuit 44 controls the speed adjustment pulse output circuit 46 to output a speed adjustment pulse to the terminal O1 (ST4).

[0178] FIG. 18 is a timing chart showing an example when the detection timing of the detection signal is earlier than the output period of the reference signal. In FIG. 18, an example is shown in which the speed adjustment pulse p1 is output to the first terminal O1 of the coil 43 at the timing when the time tp1 has elapsed from the detection timing of the detection signal DE. As shown in FIG. 18, the period in which the detection signal DE is detected is different before and after the output of the speed adjustment pulse p1. That is, the period of detection of the detection signal DE detected after the speed adjustment pulse p1 is output is longer than the period of detection of the detection signal DE detected before the speed adjustment pulse p1 is output. Thereby, after the speed adjustment pulse p1 is output, the detection signal DE is to be detected within the output period ts of the reference signal OS.

[0179] When the detection timing of the detection signal DE is later than the reference signal OS (N in ST3), the control circuit 44 controls the speed adjustment pulse output circuit 46 to output a speed adjustment pulse to the terminal O2 (ST5).

[0180] FIG. 19 is a timing chart showing an example where the timing at which the detection signal is detected is later than the output period of the reference signal. In FIG. 19, an example is shown in which the speed adjustment pulse p2 is output to the second terminal O2 of the coil 43 at the timing when the time tp2 has elapsed from the detection timing of the detection signal DE. As shown in FIG. 19, the period during which the detection signal DE is detected is different before and after the output of the speed adjustment pulse p2. That is, the period of detection of the detection signal DE detected after the speed adjustment pulse p2 is output is shorter than the period of detection of the detection signal DE detected before the speed adjustment pulse p2 is output. As a result, after the speed adjustment pulse p2 is output, the detection signal DE is to be detected within the output period ts of the reference signal OS.

[0181] Note that the speed adjustment pulse p1 output to the first terminal O1 and the speed adjustment pulse p2 output to the second terminal O2 may have different output timings and output periods. This is because the correction amounts due to the output of the speed adjustment pulse may be different in the direction of advancing the permanent magnet 41 and the direction of delaying it.

[0182] [Regarding the details of the step adjustment control: Operation flow of the first modified example of the step adjustment control] Next, with reference to FIGS. 20 and 21, a first modified example of the step adjustment control will be described. FIG. 20 is a flowchart showing the first modified example of the step adjustment control.

[0183] In this example, the step adjustment means 40 preferably has a first counter that counts the number of detections of the detection signal DE and a second counter that is an accumulation unit that accumulates the period difference between the detection signal DE and the reference signal OS (the deviation amount of the detection timing of the detection signal DE with respect to the output timing of the reference signal OS).

[0184] In the first modified example of the step adjustment control, after the power supply circuit 60 is activated by the power generation performed by the movement of the permanent magnet 41 (Y in ST1), the step adjustment control by the step adjustment means 40 is performed.

[0185] The control circuit 44 determines whether the forward and reverse rotational movement of the ten-ring 31 (permanent magnet 41) is the eighth time. Specifically, the control circuit 44 determines whether the count number of the first counter is 8 (ST21).

[0186] When the count number of the first counter is not 8 (N in ST21), the control circuit calculates the period difference between the detection signal DE and the reference signal OS, and accumulates the period difference (ST22). Then, the control circuit adds 1 to the count number of the first counter (ST23).

[0187] On the other hand, when the count number of the first counter is 8 (Y in ST21), the control circuit resets the first counter to make the count number 0 (ST24).

[0188] Then, the control circuit 44 determines whether the accumulated amount of the period difference between the detection signal DE and the reference signal OS is 0 or within a predetermined range (ST25). When the accumulated amount of the period difference between the detection signal DE and the reference signal OS is 0 or within a predetermined range, the control circuit adds 1 to the count number of the first counter without performing pace adjustment (ST23).

[0189] When the accumulated amount of the period difference between the detection signal DE and the reference signal OS is positive (N in ST25, Y in ST26), the control circuit 44 controls the speed adjustment pulse output circuit 46 to output a speed adjustment pulse to the first terminal O1 (ST4).

[0190] On the other hand, when the accumulated amount of the period difference between the detection signal DE and the reference signal OS is negative (N in ST25, N in ST26), the control circuit 44 controls the speed adjustment pulse output circuit 46 to output a speed adjustment pulse to the second terminal O2 (ST5).

[0191] In the upper part of FIG. 21, when the first counter is 2, the detection timing of the detection signal DE is earlier than the output period of the reference signal OS by t; when the first counter is 3, the detection timing of the detection signal DE is earlier than the output period of the reference signal OS by 2t; when the first counter is 6, the detection timing of the detection signal DE is delayed by t from the output period of the reference signal OS. An example is shown. In this example, the accumulated amount of the period difference becomes +2t before the first counter reaches 8. That is, the timing at which the detection signal DE is detected is 2t earlier than the reference signal OS in total. Therefore, the control circuit 44 outputs a speed adjustment pulse to the first terminal O1 so that the pace is delayed.

[0192] In the lower part of FIG. 21, when the first counter is 2, the detection timing of the detection signal DE is earlier than the output period of the reference signal OS by 3t; when the first counter is 3, the detection timing of the detection signal DE is earlier than the output period of the reference signal OS by 2t; when the first counter is 6, the detection timing of the detection signal DE is delayed by t from the output period of the reference signal OS. An example is shown. In this example, the accumulated amount of the period difference becomes +4t before the first counter reaches 8. That is, the timing at which the detection signal DE is detected is 4t earlier than the reference signal OS in total. Therefore, a speed adjustment pulse is output to the first terminal O1 so that the pace is delayed.

[0193] Also, in the example in the lower part of FIG. 21, since the accumulated amount of the period difference is larger than that in the example in the upper part of FIG. 21, the output period of the speed adjustment pulse is lengthened. Specifically, the output period p112 of the speed adjustment pulse shown in the lower part of FIG. 22 is made longer than the output period p111 of the speed adjustment pulse shown in the upper part of FIG. 22. In any of the examples in the upper and lower parts of FIG. 22, the speed adjustment pulse is output at the timing when tp111 has elapsed after the reference signal OS output when the first counter is 8 is output. That is, regardless of the output period of the speed adjustment pulse, the output timing of the speed adjustment pulse is made the same.

[0194] In the first modification example of the step speed adjustment control described above, since the step speed adjustment is not performed every second, the number of times of outputting the speed adjustment pulse can be reduced. As a result, the power consumption can be reduced.

[0195] [Regarding the details of the step speed adjustment control: Operation flow of the second modification example of the step speed adjustment control] Next, with reference to FIGS. 22 and 23, a second modification example of the step speed adjustment control will be described. FIG. 22 is a flowchart showing the second modification example of the step speed adjustment control.

[0196] In this example, the step speed adjustment means 40 preferably includes a first counter that counts the number of detections of the detection signal DE, and a second counter that is an accumulation unit that accumulates the period difference between the detection signal DE and the reference signal OS (the deviation amount of the detection timing of the detection signal DE with respect to the output timing of the reference signal OS). In the second modification example of the step speed adjustment control, it is assumed that the count number of the second counter becomes 7 when it is reset.

[0197] In the second modification example of the step speed adjustment control, after the power supply circuit 60 is activated by the power generation caused by the movement of the permanent magnet 41 (Y in ST1), the step speed adjustment control by the step speed adjustment means 40 is performed.

[0198] The control circuit 44 determines whether the forward and reverse rotational movement of the idler wheel 31 (permanent magnet 41) is the eighth time. Specifically, the control circuit 44 determines whether the count number of the first counter is 8 (ST21).

[0199] When the count number of the first counter is not 8 (N in ST21), the control circuit 44 calculates the period difference between the detection signal DE and the reference signal OS (ST31).

[0200] And when the detection timing of the detection signal DE is within the output period of the reference signal OS (Y in ST32), the control circuit 44 adds 1 to the count number of the first counter without performing step speed adjustment (ST23).

[0201] When the detection timing of the detection signal DE is not within the output period of the reference signal OS (N in ST32), the control circuit 44 determines whether the detection timing of the detection signal DE is earlier than the output period of the reference signal OS (ST33).

[0202] When the detection timing of the detection signal DE is earlier than the output period of the reference signal OS (Y in ST33), the second count is subtracted according to the period difference (ST34). When the detection timing of the detection signal DE is later than the output period of the reference signal OS (N in ST33), the second count is added according to the period difference (ST35). Then, the count number of the first counter is incremented by 1 (ST23).

[0203] When the count number of the first counter is 8 (Y in ST21), the first counter is reset to a count number of 0 (ST24).

[0204] Then, the control circuit 44 determines whether the count number of the second counter is 7 (ST36). When the count number of the second counter is 7 (Y in ST36), the count number of the first counter is incremented by 1 (ST23) without performing the step adjustment.

[0205] When the count number of the second counter is not 7 (N in ST36), the control circuit 44 determines whether the count number of the second counter is less than 7 (ST37). When the count number of the second counter is less than 7 (Y in ST37), the control circuit 44 controls the speed adjustment pulse output circuit 46 to output a speed adjustment pulse to the first terminal O1 (ST4). When the count number of the second counter is greater than 7 (N in ST37), the control circuit 44 controls the speed adjustment pulse output circuit 46 to output a speed adjustment pulse to the second terminal O2 (ST5). Then, the count number of the second counter is reset to 7 (ST38).

[0206] In the second modification of the step adjustment control described above, since the step adjustment is not performed every second, the number of times the speed adjustment pulse is output can be reduced. As a result, the power consumption can be reduced.

[0207] In FIG. 23, when the first counter is 2, the detection timing of the detection signal DE is earlier than the output period of the reference signal OS by t. When the first counter is 3, the detection timing of the detection signal DE is earlier than the output period of the reference signal OS by 2t. When the first counter is 6, an example is shown where the detection timing of the detection signal DE is delayed by t from the output period of the reference signal OS. In this example, the second counter becomes 5 before the first counter reaches 8. That is, the timing at which the detection signal DE is detected is earlier than the reference signal OS by a total of 2t. Therefore, the control circuit 44 outputs a speed adjustment pulse to the first terminal O1 so that the pace is delayed.

[0208] Note that the speed adjustment pulse is not limited to a single pulse and may be composed of a pulse group including a plurality of single pulses as shown in FIG. 24. By making the speed adjustment pulse composed of a pulse group, manufacturing variations and driving variations of the speed adjustment mechanism 30 can be absorbed. In this case, instead of changing the output period of the speed adjustment pulse as shown in FIG. 21, the duty ratio of the speed adjustment pulse may be changed to control the attractive force or repulsive force acting on the permanent magnet 41. Note that the duty ratio indicates the ratio at which a pulse is output within a predetermined period. FIG. 24 shows an example of a speed adjustment pulse with a duty ratio of 3 / 5.

[0209] [Details of Pace Adjustment Control: Pace Adjustment Control When the Power Circuit Starts from the Stopped State] FIG. 25 is a timing chart showing an example of pace adjustment control when the power circuit starts from the stopped state.

[0210] As described above, after the power supply circuit 60 is activated by power generation due to the movement of the permanent magnet 41, the step adjustment control by the step adjustment means 40 is performed. Therefore, the output of the reference signal OS used for the step adjustment control may be started after the power supply circuit 60 is activated. For example, as shown in FIG. 25, the output of the reference signal OS may be started starting from the timing when the detection signal DE is first detected. In FIG. 25, the peak of the back electromotive voltage is gradually increasing, and it shows a state where the output of the reference signal OS is started starting from the timing when the threshold value Vth is first exceeded. That is, it shows a state where the output of the reference signal OS is started from the next timing (1 second later) after the timing when the threshold value Vth is first exceeded. However, it is not limited to this, and considering the unstable rotation state immediately after the activation of the power supply circuit 60, the output of the reference signal OS may be started starting from the point in time when the detection signal DE is detected a plurality of times (predetermined number of times).

[0211] [Details of Step Adjustment Control: Step Adjustment Control Considering the Influence of Disturbance] FIG. 26 is a timing chart showing an example of step adjustment control considering the influence of disturbance. FIG. 27 is a flowchart showing an example of step adjustment control considering the influence of disturbance. FIG. 28 is a flowchart showing step adjustment control considering the influence of disturbance in the first modification of the step adjustment control shown in FIG. 20.

[0212] When an external magnet approaches or an impact is applied to the mechanical watch 1, a disturbance instantaneously acts, causing the back electromotive voltage to be disturbed and the detection signal DE may not be detected. In this case, the control circuit 44 will make a false determination that the step has significantly slowed down.

[0213] Therefore, as shown in FIG. 26, when the detection signal DE is not detected in a predetermined period including before and after the output period of the reference signal OS, it may be determined not to perform the pace adjustment. In the upper part of FIG. 26, it shows a state where the detection signal DE is not detected near the measurement time of 2.0 [s] due to the action of disturbance. Specifically, it shows a state where the detection signal is not detected in the output period ts of the reference signal OS, the period dt1 immediately before the output period ts, and the period dt2 immediately after the output period ts. In FIG. 26, an example where the period dt1 and the period dt2 have the same length is shown, but they may have different lengths. Also, the speed adjustment pulse may be output avoiding the periods dt1 and dt2. This is because when the speed adjustment pulse is output, the coil waveform (the waveform of the back electromotive force) may be disturbed, and the detection accuracy of the detection signal DE may decrease.

[0214] In the flowchart shown in FIG. 27, after the power supply circuit 60 is activated by the power generation due to the movement of the permanent magnet 41 (Y in ST1), when the detection signal DE is output (detected) during a predetermined detection period (dt1~ts~dt2) (Y in step ST11), an example of performing the pace adjustment is shown. On the other hand, when the detection signal DE is not output (detected) during a predetermined detection period (dt1~ts~dt2) (N in step ST11), an example of not performing the pace adjustment is shown. Note that each step shown in FIG. 27 is the same as that shown in FIG. 16 except for ST11, so the detailed description thereof is omitted.

[0215] In the flowchart shown in FIG. 28, after the power supply circuit 60 is activated by power generation due to the movement of the permanent magnet 41 (Y in ST1), when the detection signal DE is output (detected) during a predetermined detection period (dt1 to ts to dt2) (Y in step ST11), an example of performing step adjustment is shown. On the other hand, when the detection signal DE is not output (detected) during the predetermined detection period (dt1 to ts to dt2) (N in step ST11), an example of not performing step adjustment and resetting the first counter is shown (ST12). In this way, when affected by disturbances or the like, by resetting the first counter, the counting of the number of detections of the detection signal DE is restarted.

[0216] Note that each step shown in FIG. 28 is the same as that shown in FIG. 20 except for ST11 and ST12, and the function of the first counter is also the same, so the details of the description are omitted.

[0217] By adopting the configurations shown in FIGS. 26 to 28, it is possible to perform highly accurate step adjustment even when a disturbance is applied. In addition, since it is possible to suppress the unnecessary output of speed adjustment pulses, power consumption can be reduced.

[0218] [Regarding the details of step adjustment control: step adjustment control when consecutive detection failures of the detection signal] FIGS. 29 and 30 are timing charts showing an example of step adjustment control when consecutive detection failures of the detection signal occur. FIG. 31 is a flowchart showing an example of step adjustment control assuming consecutive detection failures of the detection signal.

[0219] When the winding of the power spring 11 is released, the rotational force of the rotor 41 weakens, and the back electromotive voltage may not exceed the threshold value Vth. In this case, the power generation amount decreases, and the stored charge in the capacitor C also decreases. That is, the mechanical clock 1 is in a state where it is likely to stop, and the power supply circuit 60 is in a state where it is likely to stop. In such a case, for power saving, it is preferable not to output the speed adjustment pulse. That is, it is preferable not to perform step adjustment.

[0220] Therefore, in the example shown in FIGS. 29 and 30, a configuration is adopted in which a "governor pulse output setting" for outputting a governor pulse and a "governor pulse stop setting" for stopping the output of the governor pulse are switched using a third counter that counts the number of consecutive failures in detecting the detection signal DE and a fourth counter that counts the number of consecutive successes in detecting the detection signal DE.

[0221] Specifically, when the third counter reaches 10, that is, when the detection of the detection signal DE fails 10 times in a row, a configuration is adopted in which the setting is switched to the governor pulse stop setting. Also, when the fourth counter reaches 20, that is, when the detection of the detection signal DE succeeds 20 times in a row, a configuration is adopted in which the setting is switched to the governor pulse output setting. Note that the count numbers that trigger the setting switch are just examples and are not limited to those shown here.

[0222] FIG. 29 shows an example in which the peak of the back electromotive voltage is small and the setting is switched to the governor pulse stop setting due to 10 consecutive failures in detecting the detection signal DE.

[0223] In FIG. 30, an example is shown in which the setting is switched to the governor pulse stop setting due to 10 consecutive failures in detecting the detection signal DE, and then the setting is switched to the governor pulse output setting due to 20 consecutive successes in detecting the detection signal DE, and thus the governor pulse p1 is being output. Whether the detection signal DE is detected successfully or not is determined based on whether the detection signal DE is output (detected) during a predetermined detection period (dt1~ts~dt2), similar to the examples shown in FIGS. 26 to 28.

[0224] In the flowchart shown in FIG. 31, after the power supply circuit 60 is activated by power generation due to the movement of the permanent magnet 41 (Y in ST1), it is determined whether the governor pulse stop setting is in effect (ST41). Note that whether the governor pulse stop setting is in effect may be determined based on, for example, whether the governor pulse stop flag is set.

[0225] When not in the speed control pulse stop setting (N in ST41), the control circuit 44 determines whether the third counter is 10 (ST42). That is, the control circuit 44 determines whether the detection of the detection signal DE has failed continuously 10 times. When the third counter is not 10 (N in ST42), the control circuit 44 determines whether the first counter is 8 (ST21). That is, the control circuit 44 determines whether the number of detections of the detection signal DE is 8.

[0226] When the first counter is 8 (Y in ST21), the processes after ST24 shown in FIG. 20 are performed. On the other hand, when the first counter is not 8 (N in ST21), the control circuit 44 determines whether the detection signal DE has been output (detected) during a predetermined detection period (dt1~ts~dt2) (ST43). When the detection signal DE has not been output (detected) during the predetermined detection period (dt1~ts~dt2) (N in ST43), the count number of the third counter is incremented by 1 (ST44), and the count number of the first counter is incremented by 1 (ST23). On the other hand, when the detection signal DE has been output (detected) during the predetermined detection period (dt1~ts~dt2) (Y in ST43), the third counter is reset (ST45), the period difference between the detection signal DE and the reference signal OS is calculated, and the period difference is accumulated (ST22).

[0227] Also, when in the speed control pulse stop setting in ST41 (Y in ST41), the control circuit 44 determines whether the count number of the fourth counter is 20 (ST51). That is, the control circuit 44 determines whether the detection of the detection signal DE has been successful continuously 20 times. When the fourth counter is not 20 (N in ST51), the control circuit 44 determines whether the detection signal DE has been output (detected) during a predetermined detection period (dt1~ts~dt2) (ST52). When the detection signal DE has not been output (detected) during the predetermined detection period (dt1~ts~dt2) (N in ST52), the fourth counter is reset (ST53). When the detection signal DE has been output (detected) during the predetermined detection period (dt1~ts~dt2) (Y in ST52), the count number of the fourth counter is incremented by 1 (ST54).

[0228] When the count number of the fourth counter in ST51 is 20 (Y in ST51), reset the fourth counter (ST55) and switch to the speed control pulse output setting (ST56).

[0229] Also, when the count number of the third counter in ST42 is 10 (Y in ST42), reset the third counter (ST61) and switch to the speed control pulse stop setting (ST62). When the operation of the power supply circuit 60 starts after it has stopped, since the stored charge of the capacitor C is small, it can be said that the power supply circuit 60 is likely to stop again. Therefore, when the operation of the power supply circuit 60 starts after it has stopped, it is advisable to increase the number of consecutive successful detections of the detection signal DE required until the pace adjustment starts. For example, in ST51 of FIG. 31, when the count number of the fourth counter is 60, that is, when the detection of the detection signal DE has been successful 60 times in a row, it is advisable to switch to the speed control pulse output setting.

[0230] In the examples of FIGS. 29 to 31 described above, by restricting the pace adjustment from being performed, the power consumption can be reduced, and when the power spring 11 is wound up, it is easier to immediately shift to the pace adjustment.

[0231] In the examples of FIGS. 29 to 31, it may have a function of notifying the user that the mechanical clock 1 is in a state where it is likely to stop when a back electromotive voltage exceeding the threshold value Vth is not detected continuously for a predetermined number of seconds. As a means of notification, for example, the position indicated by the pointer etc. may be used. Thereby, it is possible to prompt the user to perform an operation of winding up the power spring 11.

[0232] Also, in the examples of FIGS. 29 to 31, when a reverse electromotive force exceeding the threshold voltage Vth is not continuously detected for a predetermined number of seconds, the threshold voltage may be decreased. Specifically, for example, when the threshold voltage Vth is 0.5 V and the detection of the detection signal DE fails 10 consecutive times, the threshold voltage may be set to 0.25 V. Thereby, although the power supply circuit 60 is more likely to stop, the accuracy of the step rate can be maintained. Then, after decreasing the threshold voltage Vth, when a reverse electromotive force exceeding the decreased threshold voltage is continuously detected for a predetermined number of seconds, it may be returned to the original threshold voltage Vth. Also, when a reverse electromotive force exceeding the threshold voltage Vth is not continuously detected for a predetermined number of seconds, the threshold voltage may be decreased step by step.

[0233] [Details of Step Adjustment Control: Step Adjustment Control Considering the Rotation Direction of the Tens Wheel] FIG. 32 is a timing chart showing an example of the output timing of the reference signal. Due to manufacturing variations during the assembly of the mechanical watch 1 or the position adjustment of the tens wheel 31 by the support member 33 during the shipping inspection, etc., the rotation angle of the tens wheel 31 may differ between the forward and reverse directions. If the rotation angles are different, the timing at which the detection signal DE is detected will be different between the forward and reverse directions. As a result, although there is no step deviation as a whole, there is a possibility that unnecessary speed adjustment pulses may be output.

[0234] Therefore, in the example shown in FIG. 32, a configuration is adopted in which the reference signal OS is set based on a 2-step (2-second) basis. The upper part of FIG. 32 shows an example of the waveform of the back electromotive voltage when the detection signals DE detected in the forward and reverse directions are different. The lower part of FIG. 32 shows an example of a timing chart when the reference signal OS is set based on a 2-step (2-second) basis. As shown in the lower part of FIG. 32, the output interval of the odd-numbered reference signals OS from the left is set as tr1, and the output interval of the even-numbered reference signals OS from the left is set as tr2 (= tr1). This example may be realized by the control circuit 44 performing two-system control in units of 2 steps (2 seconds). And when a gait abnormality is detected in any of the control systems, gait adjustment may be performed. Note that, for simplification of the circuit configuration, it may be a control system with only one system whose output interval is either tr1 or tr2.

[0235] According to the example shown in FIG. 32, by providing the reference signal OS based on a 2-step basis (tr1 and tr2) and performing gait adjustment according to each, even if there is a difference in the rotational angle of the tens wheel 31 for the forward and backward rotations, the circuit is less likely to stop due to external disturbances and highly accurate gait adjustment is possible.

[0236] Note that the middle part of FIG. 32 shows a timing chart when the reference signal OS is set based on a 1-step (1-second) basis, that is, in the example shown in FIG. 17 and the like described above. In the example shown in the middle part of FIG. 32, since the peak positions of the back electromotive voltage are different in the forward and reverse directions, although there is no overall gait deviation, the output timing of the even-numbered detection signals DE from the left is always deviated. In such a case, unnecessary speed adjustment pulses will be output.

[0237] [Summary] In this embodiment, since a configuration is adopted in which the angular velocity of the balance wheel 31 is reduced, wear of each mechanism (for example, the escape wheel 21 and the lever 22) that transmits power can be suppressed. As a result, the durability of the mechanical watch 1 is improved. Further, by using the air resistance member 15, a configuration is adopted in which the angular velocity of the balance wheel 31 is reduced during the intermediate period in the forward and reverse movements of the balance wheel 31. Thereby, while slowing down the rotation period of the balance wheel 31, sufficient power generation can be ensured by generating power during the period when the balance wheel 31 is not receiving air resistance from the air resistance member 15. Further, the accuracy of the step adjustment can be maintained by performing the step adjustment during the period when the balance wheel 31 is receiving air resistance from the air resistance member 15 or after receiving it. Further, since a configuration is adopted in which the permanent magnet 41 is arranged so as to obtain a back electromotive voltage suitable for half-wave rectification, power can be efficiently extracted using half-wave rectification.

[0238] [Others] The step adjustment means 40 obtains a detection signal based on the operation of the permanently magnet 41 magnetized with two poles. If there is a member that magnetically affects the periphery of the permanent magnet 41, the detection accuracy may decrease. Therefore, it is preferable to adopt a material for the member around the permanent magnet 41 that has little magnetic influence.

[0239] For example, it is preferable to use a resin material for the materials of the support member 33 and the beard holder 34. Further, it is preferable to use phosphor bronze as the material of the fixture 33a for fixing the support member 33 to the base plate 10. Further, as the material of the balance wheel 31, it is preferable to use a resin material or aluminum. Further, as the air resistance member 15, it is preferable to use an acrylic resin. Note that the materials listed here are examples and are not necessarily limited to these.

[0240] Also, as described above, since the mustache spring 32 is made of resin in order to reduce the Young's modulus, the magnetic influence on the permanent magnet 41 can be reduced as compared with the case of being made of metal. Further, when the mustache spring 32 is made of a magnetic metal, it may be magnetically affected by the permanent magnet 41, and the shape and posture of the mustache spring 32 may be displaced. In the present embodiment, since the mustache spring 32 is made of resin, the shape and posture of the mustache spring 32 itself can be stabilized. Further, a magnetic shield plate made of a magnetic material may be separately provided in the mechanical watch 1. Thereby, even when an external magnet approaches the mechanical watch 1, the forward and reverse rotational movements of the permanent magnet 41 (the balance wheel 31) are suppressed from being disturbed, and stable pace adjustment can be performed.

[0241] Also, in the present embodiment, as shown in FIG. 5, an example in which the first end portion 421a and the second end portion 422a of the soft magnetic core 42 are integrated via the first welding portion 423 and the second welding portion 424 is shown, but the present invention is not limited to this. For example, the first welding portion 423 and the second welding portion 424 may not be provided, and the first end portion 421a and the second end portion 422a may be magnetically coupled via a gap and separated. Further, the present invention is not limited to completely separating the magnetic coupling. For example, the first end portion 421a and the second end portion 422a may be physically connected via a constricted portion that is a separating portion.

[0242] Also, although not shown, the mechanical watch 1 may have an opening or a transparent portion through which the balance wheel 31 can be visually recognized from the outside on the dial or the back cover.

[0243] Also, in the present embodiment, an example in which the air resistance member 15 is provided has been described, but the present invention is not limited to this, and the air resistance member 15 may not be provided. Further, when the air resistance member 15 is not provided, the balance wheel 31 may not have the acted portion 313.

[0244] When adopting a configuration in which air resistance is applied to the balance wheel 31 using the air resistance member 15 as in the present embodiment, the duration of the mainspring 11 will be shortened by the amount of energy consumption due to air resistance. On the other hand, in the present embodiment, the operation of the balance wheel 31 is slowed down by adopting a resin material with a low Young's modulus as the material of the hairspring 32, and the duration is longer compared to conventional mechanical watches with 6 to 8 vibrations. That is, by slowing down the operation of the balance wheel 31, it is possible to compensate for the decrease in duration due to air resistance. Therefore, a sufficient duration can be realized as a mechanical watch.

Explanation of Signs

[0245] 1 Mechanical watch, 2 Winding stem, 10 Base plate, 10a Positioning pin, 10b Opening, 11 Mainspring, 12 Wheel train, 122 Second wheel, 123 Third wheel, 124 Fourth wheel, 13 Pointer shaft, 131 Second hand, 15 Air resistance member, 151 First wall portion, 152 Second wall portion, 153 Third wall portion, 154 Base portion, 20 Escapement mechanism, 21 Gang wheel, 22 Anchor, 221 Anchor wheel, 222 Rod portion, 223 First arm portion, 224 Second arm portion, 30 Regulating mechanism, 31 Balance wheel, 311 Balance wheel, 312 Circular portion, 313 Portion to be acted on, 315 Oscillating weight, 32 Hairspring, 321 Outer end portion, 322 Inner end portion, 322a Fixed portion, 322b Pitch enlarged portion, 33 Support member, 33a Pipe, 33b Screw, 34 Hairspring holder, 35 Vacant member, 35a Protrusion, 40 Pace adjustment means, 41 Permanent magnet, 42 Soft magnetic core, 421 First magnetic portion, 421a First end portion, 422 Second magnetic portion, 422a Second end portion, 43 Coil, 44 Control circuit, 45 Rotation detection circuit, 46 Regulating pulse output circuit, 47 Divider circuit, 48 Oscillator circuit, 50 Rectifier circuit, 60 Power supply circuit, 70 Crystal oscillator, n11,n12,n21,n22 Notch.

Claims

1. A beard spring that elastically deforms to cause the mainspring to rotate forward and backward, A polarized permanent magnet that rotates forward and backward as the mainspring rotates forward and backward, A coil in which a counter electromotive voltage is generated by the forward and backward rotation of the permanent magnet, A first end portion provided along the outer periphery of the permanent magnet, and a second end portion provided along the outer periphery of the permanent magnet and disposed opposite to the first end portion with the permanent magnet interposed therebetween, and a soft magnetic core that forms a magnetic circuit together with the coil, A control circuit that is driven by the electric power generated based on the counter electromotive voltage and performs step adjustment based on the counter electromotive voltage and the reference oscillation frequency of a reference signal source, A base plate, A fixed member having a fixed portion fixed to the base plate and a positioning portion in which a through hole that at least partially overlaps the permanent magnet in a plan view is formed, A positioning frame fitted into the through hole to position the fixed member, the first end portion, and the second end portion, A mechanical watch having the same.

2. The positioning frame is in contact with the inner peripheral surface of the through hole and the inner peripheral surfaces of the first end portion and the second end portion. The mechanical watch according to claim 1.

3. The positioning frame has a first convex portion in contact with the inner peripheral surface of the through hole and a second convex portion protruding from the first convex portion and in contact with the inner peripheral surfaces of the first end portion and the second end portion. The mechanical watch according to claim 1 or 2.

4. The soft magnetic core is fixed to the fixed member by a fixture. The mechanical watch according to any one of claims 1 to 3.

5. Positioning holes are respectively formed in the fixed member and the soft magnetic core. The fixed member and the soft magnetic core are positioned with respect to the base plate by fitting a positioning pin fixed to the base plate into the positioning holes. The mechanical watch according to any one of claims 1 to 4.

6. The soft magnetic core and the permanent magnet are provided between the fixed member and the base plate. The mechanical watch according to any one of claims 1 to 5.

7. The fixed member is made of a non-magnetic material. The mechanical watch according to any one of claims 1 to 6.

8. A holding member having a holding portion for fixing the outer end portion of the beard spring, and a held portion sandwiched between the positioning portion and the positioning frame. The mechanical watch according to any one of claims 1 to 7.

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