Patent Description:
The present disclosure relates to an electronically controlled mechanical watch.

An electronically controlled mechanical watch that accumulates, in a power supply circuit, electrical energy generated by driving a generator using mechanical energy when a mainspring is released, operates a crystal oscillator and a braking control circuit with the electrical energy, and controls rotation of a rotor of the generator based on an oscillation frequency of the crystal oscillator to accurately drive hands fixed to a wheel train and accurately indicate a time is known (<CIT>). Examples of mechanical watches can also be found in <CIT> and <CIT>.

In this electronically controlled mechanical watch, a logical regulation circuit that stores correction data for correcting individual differences in characteristics of the crystal oscillator, and inputs a set or reset signal to each division stage of a frequency divider circuit that divides the oscillation signal of the crystal oscillator, at a predetermined timing, to digitally lengthen or shorten a cycle time of a clock signal is used.

The oscillation frequency of the crystal oscillator fluctuates due to deterioration over time due to manufacturing, and thus, even when a rate of the watch is adjusted with the logical regulation circuit using the correction data stored at the time of product shipment, it is not possible to correct the time to the correct time, and time accuracy is likely to be degraded. Therefore, there is a demand for an electronically controlled mechanical watch that indicates a time using a torque from a mechanical energy source such as a mainspring, and that can maintain time accuracy even when a crystal oscillator deteriorates over time.

An electronically controlled mechanical watch according to the present disclosure is set out in the appended set of claims.

Hereinafter, an electronically controlled mechanical watch <NUM> according to an embodiment of the present disclosure will be described with reference to the drawings. In the description of the embodiment, a "plan view" means a state viewed in a direction orthogonal to a dial <NUM>, that is, a shaft direction of a pointer shaft, and a "side view" means a state viewed in a direction perpendicular to the pointer shaft.

<FIG> is a front view illustrating an electronically controlled mechanical watch <NUM>, <FIG> is a rear view illustrating the electronically controlled mechanical watch <NUM>, and <FIG> is a rear view in a state in which a back cover <NUM> has been removed. The upper side of <FIG> and <FIG> is the <NUM> o'clock side, and the lower side is the <NUM> o'clock side. The electronically controlled mechanical watch <NUM> of the present embodiment is called a skeleton type watch or a seethrough type watch whose power reserve hand <NUM> can be viewed from the back side of the electronically controlled mechanical watch <NUM>.

The electronically controlled mechanical watch <NUM> is a wristwatch worn on a wrist of a user, and includes a cylindrical exterior case <NUM>, and the dial <NUM> is disposed on the inner circumference side of the exterior case <NUM>. An opening on the front side between two openings of the exterior case <NUM> is closed with a cover glass, and the opening on the back side is closed with the back cover <NUM>. The back cover <NUM> is configured of a ring-shaped frame 8A and a back cover glass 8B attached to the frame 8A.

The electronically controlled mechanical watch <NUM> includes a movement <NUM> accommodated in the exterior case <NUM>, an hour hand 4A, a minute hand 4B, and a second hand 4C that indicate time information illustrated in <FIG>, and the power reserve hand <NUM> indicating a remaining amount of winding-up of the mainspring illustrated in <FIG>. A small calendar window 3A is provided in the dial <NUM>, and a date wheel <NUM> can be visually recognized from the small calendar window 3A.

An opening <NUM> is formed in a oscillating weight <NUM> illustrated in <FIG> and <FIG>, and is configured so that the power reserve hand <NUM> is less visible depending on a position of the oscillating weight <NUM>.

A fan-shaped indicator portion 12A is provided on a rear surface of a train wheel bridge <NUM>, which will be described below. The remaining amount of winding-up of the mainspring can be indicated by pointing at the indicator portion 12A with the power reserve hand <NUM>.

A crown <NUM> is provided on the side surface of the exterior case <NUM>. The crown <NUM> can be pulled out and moved from a 0th stage position pushed toward a center of the electronically controlled mechanical watch <NUM> to a first stage position and a second stage position.

When the crown <NUM> is rotated to the 0th position, a mainspring <NUM> that is a mechanical energy source provided in the movement <NUM> can be wound, as will be described below. The power reserve hand <NUM> moves in conjunction with winding-up of the mainspring <NUM>.

When the crown <NUM> is pulled to the first stage step position and rotated, a gear to which the rotation of the crown <NUM> is transmitted is switched by a switching mechanism <NUM>, which will be described below, and the date wheel <NUM> can be moved to set the date. When the crown <NUM> is pulled to the second step position, the second hand 4C stops, and when the crown <NUM> is rotated at the second step position, the gear to which the rotation of the crown <NUM> is transmitted is switched by the switching mechanism <NUM>, and the hour hand 4A and the minute hand 4B are moved, allowing adjustment by movement around. Since a configuration of the switching mechanism <NUM> and a method of correcting the date wheel <NUM>, the hour hand 4A, and the minute hand 4B using the crown <NUM> are the same as those of a mechanical watch of the related art, description thereof is omitted.

Next, the movement <NUM> will be described with reference to <FIG>, in addition to <FIG> and <FIG>. <FIG> is a rear view of essential parts of the movement <NUM> viewed from the back cover <NUM> side, and <FIG> is a rear view of the essential parts of the movement <NUM> from which a train wheel bridge <NUM> has been removed, viewed from the back cover <NUM> side. In <FIG> and <FIG>, a <NUM> o'clock side on which a winding stem <NUM> to which the crown <NUM> is attached is disposed is set as an upper side, a <NUM> o'clock side is set as a lower side, a <NUM> o'clock side is set as a right side, and a <NUM> o'clock side is set as a left side. <FIG> is a cross-sectional view of the essential parts of the movement <NUM>.

The movement <NUM> includes a main plate <NUM>, the train wheel bridge <NUM>, and a second bridge <NUM>, as illustrated in <FIG>. The second bridge <NUM> is disposed between the main plate <NUM> and the train wheel bridge <NUM>.

A time indication wheel train <NUM>, a winding-up mechanism <NUM>, the switching mechanism <NUM>, a power reserve mechanism <NUM>, a generator <NUM>, and a circuit unit <NUM> are included between the main plate <NUM> and the train wheel bridge <NUM> as illustrated in <FIG>.

The time indication wheel train <NUM> includes a barrel complete <NUM>, a second wheel <NUM>, a third wheel <NUM>, a fourth wheel <NUM>, a fifth wheel <NUM>, and a sixth wheel <NUM>, as illustrated in <FIG> and <FIG>. The mainspring <NUM> is accommodated in the barrel complete <NUM>, and a central edge of the mainspring <NUM> is attached to a barrel arbor. A ratchet wheel <NUM> that rotates integrally with the barrel arbor is attached to the barrel arbor.

Therefore, when the ratchet wheel <NUM> is rotated, the mainspring <NUM>, which is a mechanical energy source, can be wound, and when the barrel complete <NUM> is rotated by the mechanical energy accumulated by winding of this mainspring <NUM>, the second wheel <NUM>, the third wheel <NUM>, the fourth wheel <NUM>, the fifth wheel <NUM>, and the sixth wheel <NUM> sequentially rotate. The sixth wheel <NUM> meshes with a rotor pinion of the generator <NUM>, and when the sixth wheel <NUM> rotates, a rotor <NUM> of the generator <NUM> rotates. A rotor inertia disk <NUM> for stably rotating the rotor <NUM> is attached to the rotor <NUM>.

As illustrated in <FIG>, a pinion <NUM> is attached to the second wheel <NUM>, and a second hand shaft <NUM> is attached to the fourth wheel <NUM>. Further, an hour wheel <NUM> to which rotation of the pinion <NUM> is transmitted via a minute wheel(not illustrated) is disposed in an outer circumference of the pinion <NUM>. The hour hand 4A, the minute hand 4B, and the second hand 4C are attached to the hour wheel <NUM>, the pinion <NUM>, and the second hand shaft <NUM>, respectively.

The winding-up mechanism <NUM> includes an automatic winding-up mechanism and a manual winding-up mechanism.

The automatic winding-up mechanism includes the oscillating weight <NUM> and a bearing <NUM> illustrated in <FIG> and <FIG>, and an eccentric wheel <NUM>, a pawl lever <NUM>, and a transmission wheel <NUM> illustrated in <FIG>.

The oscillating weight <NUM> includes a weight body portion <NUM> and a weight portion <NUM>. The weight body portion <NUM> is formed in a thin plate shape and includes a central shaft portion <NUM> fixed to the bearing <NUM>, and an opening <NUM>. The weight portion <NUM> is formed continuously on an outer circumference of the weight body portion <NUM> and is formed to be thicker than the weight body portion <NUM>. That is, in the oscillating weight <NUM>, the weight body portion <NUM> and the weight portion <NUM> are integrally formed. Although the weight body portion <NUM> overlaps the train wheel bridge <NUM> in plan view, the weight portion <NUM> is configured not to overlap the train wheel bridge <NUM>.

The bearing <NUM> is a bearing for rotatably supporting the oscillating weight <NUM>, and includes an inner ring <NUM> fixed to the train wheel bridge <NUM>, an outer ring <NUM> integrally rotating with the oscillating weight <NUM>, and a ball disposed between the inner ring <NUM> and the outer ring <NUM>. A gear 322A is formed on an outer circumference surface of the outer ring <NUM>.

The eccentric wheel <NUM> meshes with the gear 322A of the bearing <NUM>, and rotates forward and backward in conjunction with the rotation of the oscillating weight <NUM>. Further, the eccentric wheel <NUM> includes an eccentric shaft provided to be eccentric from a rotation shaft of the eccentric wheel <NUM>.

The pawl lever <NUM> is rotatably attached to an eccentric shaft of the eccentric wheel <NUM>. When the eccentric wheel <NUM> rotates in conjunction with the oscillating weight <NUM>, the pawl lever <NUM> attached to the eccentric wheel <NUM> advances and retreats toward and away from the transmission wheel <NUM>, thereby rotating the transmission wheel <NUM> in one direction.

A pinion of the transmission wheel <NUM> meshes with the ratchet wheel <NUM>, and the ratchet wheel <NUM> rotates in one direction in conjunction with the rotation of the transmission wheel <NUM>. When the ratchet wheel <NUM> rotates, the barrel arbor rotates and the mainspring <NUM> is wound up.

The manual winding-up mechanism includes the winding stem <NUM> to which the crown <NUM> is attached, a clutch wheel(not illustrated), a winding pinion <NUM>, a crown wheel <NUM>, a first intermediate rachet wheel <NUM>, a second intermediate rachet wheel <NUM>, and a third intermediate rachet wheel <NUM>, as illustrated in <FIG>. The second intermediate rachet wheel <NUM> rotates integrally with a pinion of a separate body with a gear disposed coaxially with the opinion, and the third intermediate rachet wheel <NUM> meshes with the pinion of the transmission wheel <NUM>. Therefore, when the crown <NUM> is rotated, the ratchet wheel <NUM> and the barrel arbor rotate via the transmission wheel <NUM>, and the mainspring <NUM> is wound up.

Therefore, in the electronically controlled mechanical watch <NUM> of the present embodiment, it is possible to wind up the mainspring <NUM> by any one of the automatic winding-up mechanism and the manual winding-up mechanism. Therefore, a winding wheel train of the mainspring <NUM> includes the gear 322A of the outer ring <NUM> included in the automatic winding-up mechanism and the manual winding-up mechanism, the eccentric wheel <NUM>, the pawl lever <NUM>, the transmission wheel <NUM>, the ratchet wheel <NUM>, the clutch wheel, the winding pinion <NUM>, the crown wheel <NUM>, the first intermediate rachet wheel <NUM>, the second intermediate rachet wheel <NUM>, and the third intermediate rachet wheel <NUM>.

As the electronically controlled mechanical watch <NUM>, only one of the automatic winding-up mechanism and the manual winding-up mechanism may be provided.

The switching mechanism <NUM> is a mechanism that switches a transmission destination of the rotation force of the crown <NUM> according to an operation for pulling the crown <NUM>, and includes the winding stem <NUM>, the clutch wheel, the winding pinion <NUM>, a setting lever, a yoke, a setting lever jumper, a lever for setting lever, a setting wheel, and the like. Since a configuration of the switching mechanisms <NUM> is the same as that of a general mechanical watch, description thereof will be omitted.

The power reserve mechanism <NUM> is a mechanism that indicates the remaining amount of winding-up of the mainspring <NUM>, which is the drive source. The power reserve mechanism <NUM> includes a planetary gear mechanism <NUM>, a winding indication train wheel <NUM>, a rewinding-up indication train wheel <NUM>, a first intermediate winding marking wheel <NUM>, a second intermediate winding marking wheel <NUM>, and a winding marking wheel <NUM>, the fan-shaped indicator portion 12A disposed on the train wheel bridge <NUM> illustrated in <FIG>, and the power reserve hand <NUM>. A substantially strip-shaped indicator indicated by the power reserve hand <NUM> is indicated on the indicator portion 12A. Since a duration of the electronically controlled mechanical watch <NUM> can be estimated from the remaining amount of winding-up of the mainspring <NUM>, which is the driving source, the duration can be indicated by the power reserve hand <NUM> when a number indicating the duration is printed on the indicator portion 12A.

The winding indication train wheel <NUM> is configured of a plurality of gears including a gear meshing with the barrel arbor, and rotates in conjunction with the rotation of the barrel arbor, that is, a winding-up operation of the mainspring <NUM>. The rotation of the barrel arbor is transmitted to the planetary gear mechanism <NUM> via the winding indication train wheel <NUM>.

The rewinding-up indication train wheel <NUM> is configured of a plurality of gears including a gear meshing with the barrel complete <NUM>, and rotates in conjunction with the rotation of the barrel complete <NUM>, that is, the rewinding of the mainspring <NUM>. The rotation of the barrel complete <NUM> is transmitted to the planetary gear mechanism <NUM> via the rewinding-up indication train wheel <NUM>.

Although details are omitted, the planetary gear mechanism <NUM> is configured to rotate the first intermediate winding marking wheel <NUM> in a first direction in conjunction with the winding of the mainspring <NUM>, and rotate the first intermediate winding marking wheel <NUM> in a second direction opposite the first direction in conjunction with the rewinding of the mainspring <NUM>.

The first intermediate winding marking wheel <NUM> rotates the winding marking wheel <NUM> via the second intermediate winding marking wheel <NUM>. A power reserve hand <NUM> is attached to the shaft of the winding marking wheel <NUM>.

The generator <NUM> includes the rotor <NUM>, a rotor inertia disk <NUM>, and a coil block <NUM>, as illustrated in <FIG>. The coil block <NUM> is constructed by winding a coil around each core.

Therefore, when the rotor <NUM> rotates due to an external torque, the generator <NUM> generates induced power using the coil block <NUM> and outputs electrical energy. Further, it is possible to apply the brake to the rotor <NUM> by short-circuiting the coil, and to regulate a rotation cycle of the rotor <NUM> to be constant by controlling braking force.

The circuit unit <NUM> includes a circuit board <NUM>, an electronic control circuit <NUM> that is an IC, a rotary switch <NUM>, a crystal oscillator <NUM>, and various circuits such as a rectifier circuit and a power supply circuit. In the present embodiment, the electronic control circuit <NUM> and the crystal oscillator <NUM> are sealed in a reception container to form one package <NUM>, as illustrated in <FIG>. The electronic control circuit <NUM> and the crystal oscillator <NUM> are not limited to being enclosed in one package <NUM>, and the electronic control circuit <NUM> and the crystal oscillator <NUM> may be separately attached to the circuit board <NUM>.

The circuit board <NUM> is disposed on a back surface of the main plate <NUM>, that is, on a surface of the back cover side, as illustrated in <FIG>. The package <NUM> or the like is attached to the circuit board <NUM>, and as illustrated in <FIG> and <FIG>, logical regulation setting patterns <NUM>, <NUM>, and <NUM> and a dummy pattern <NUM> used for setting of a logical regulation value are formed at the end of the circuit board <NUM>. The rotary switch <NUM> is provided at end of the circuit board <NUM> at which the patterns <NUM>, <NUM>, <NUM>, and <NUM> are formed, that is, in the outer peripheral portion of the movement <NUM>. Further, the rotary switch <NUM> is provided so as not to overlap the time indication wheel train <NUM>, the winding-up mechanism <NUM>, the switching mechanism <NUM>, the power reserve mechanism <NUM>, and the generator <NUM> in plan view in the movement <NUM>. On the other hand, the rotary switch <NUM> is disposed at a position overlapping a rotation locus of the oscillating weight <NUM> in plan view.

A first logical regulation setting pattern <NUM> includes a pad <NUM>, a wiring portion <NUM>, and a contact portion <NUM>.

The pad <NUM> is formed at a position overlapping the package <NUM> in plan view and is electrically coupled to the electronic control circuit <NUM> through a terminal of the package <NUM>. The wiring portion <NUM> electrically couples the pad <NUM> to the contact portion <NUM>. The contact portion <NUM> is formed in an annular fan shape around a through hole <NUM> formed in the circuit board <NUM>.

The second logical regulation setting pattern <NUM> includes a pad <NUM>, a first wiring portion <NUM>, a second wiring portion <NUM>, a first contact portion <NUM> and a second contact portion <NUM>.

The pad <NUM> is formed at a position overlapping the package <NUM> in plan view, and is electrically coupled to electronic control circuit <NUM> via the terminal of the package <NUM>. The first wiring portion <NUM> electrically couples the pad <NUM> to the first contact portion <NUM>, and the second wiring portion <NUM> electrically couples the first contact portion <NUM> to the second contact portion <NUM>. The first wiring portion <NUM> is formed substantially along the wiring portion <NUM>. The second wiring portion <NUM> is formed in an arc shape along the outer circumferences of the first contact portion <NUM> and the second contact portion <NUM>.

The third logical regulation setting pattern <NUM> includes a pad <NUM>, a first wiring portion <NUM>, a second wiring portion <NUM>, a first contact portion <NUM>, and a second contact portion <NUM>.

The pad <NUM> is formed at a position overlapping the package <NUM> in plan view and is electrically coupled to the electronic control circuit <NUM> through the terminal of the package <NUM>. The first wiring portion <NUM> electrically couples the pad <NUM> to the first contact portion <NUM>, and the second wiring portion <NUM> electrically couples the first contact portion <NUM> to the second contact portion <NUM>. The second wiring portion <NUM> is formed in an arc shape along outer circumferences of the first contact portion <NUM> and the second contact portion <NUM>.

The dummy pattern <NUM> includes a wiring portion <NUM>, a first contact portion <NUM>, a second contact portion <NUM>, and a third contact portion <NUM>. The first contact portion <NUM> is formed at the inner circumference side of the second wiring portion <NUM>, that is, between the first contact portion <NUM> and the second contact portion <NUM>. The second contact portion <NUM> is formed at the inner circumference side of the second wiring portion <NUM>, that is, between the first contact portion <NUM> and the second contact portion <NUM>. The third contact portion <NUM> is formed between the contact portion <NUM> and the first contact portion <NUM>.

The wiring portion <NUM> is formed in an arc shape along an outer circumference of the through hole <NUM> and is electrically coupled to the first contact portion <NUM>, the second contact portion <NUM> and the third contact portion <NUM>. The wiring portion <NUM> extends to a position of a through hole <NUM> formed in the circuit board <NUM>.

Each of the patterns <NUM>, <NUM>, <NUM>, and <NUM> formed at the circuit board <NUM> is formed by laminating a copper foil and a gold plating on a surface of the circuit board <NUM>. Further, when the pattern is formed at the circuit board <NUM> using the copper foil, the dummy pattern <NUM> is conducted to the logical regulation setting pattern <NUM>. In this state, the gold plating is formed at the copper foil. Thereafter, the through hole <NUM> is processed to separate the dummy pattern <NUM> from the logical regulation setting pattern <NUM>. This makes it possible to form the gold plating in the patterns <NUM>, <NUM>, <NUM>, and <NUM> at the same time, and improve the manufacturing efficiency of the patterns <NUM>, <NUM>, <NUM>, and <NUM>.

The rotary switch <NUM> includes a shaft member <NUM> attached to the main plate <NUM>, a holding component <NUM> rotatably inserted into the shaft member <NUM>, a coil spring <NUM> that biases the holding component <NUM> toward the circuit board <NUM>, and a switch lever <NUM> held in the holding component <NUM>, as illustrated in <FIG>.

The holding component <NUM> includes a rotation shaft portion <NUM> formed in a cylindrical shape and rotatably attached to the shaft member <NUM>, and a flange portion <NUM> formed in an outer peripheral portion of the rotation shaft portion <NUM>, as illustrated in <FIG>.

The coil spring <NUM> is disposed between the flange portion <NUM> of the holding component <NUM> and a receiving component <NUM>. The receiving component <NUM> is a part that is spaced apart from the main plate <NUM> and disposed to face a tip of the shaft member <NUM>, and is disposed on the outer side of the train wheel bridge <NUM> and along the outer circumference of the movement <NUM>, as illustrated in <FIG>. The receiving component <NUM> is formed in an arc from a <NUM> o'clock position at which the winding stem <NUM> is disposed to a <NUM> o'clock position at which the coil block <NUM> of the generator <NUM> is disposed via a <NUM> o'clock position, and is disposed at a position at which, for example, a part of the circuit board <NUM> not covered with the train wheel bridge <NUM> is covered. The receiving component <NUM> is made of a metal plate and also functions as an anti-magnetic component. Further, the circuit board <NUM> can be pressed through a component such as a circuit receiver, and in this case, this also functions as a circuit pressing plate.

The switch lever <NUM> includes a base portion <NUM> in which a fitting hole that is fitted to the outer circumference of the rotation shaft portion <NUM> is formed, a pair of switch arms <NUM> that extend in opposite directions from the base portion <NUM>, and an operation arm <NUM> extending in an opposite direction from the base portion <NUM>, as illustrated in <FIG> and <FIG>. Although the switch arm <NUM> and the operation arm <NUM> are disposed in directions perpendicular to each other in plan view as illustrated in <FIG>, the switch arms <NUM> and the operation arm <NUM>, which are disposed to be orthogonal to each other, are shown at opposite positions for convenience in <FIG>.

Each switch arm <NUM> is disposed along the surface of the circuit board <NUM>, and a conduction portion <NUM> that protrudes toward the circuit board <NUM> is formed at a tip of the switch arm <NUM>. A surface of the conduction portion <NUM> is formed in a spherical shape.

The operation arm <NUM> extends from the base portion <NUM> to the back cover and further extends to the outer peripheral side. A groove <NUM> is formed in an outer circumference end portion of the operation arm <NUM>. In the train wheel bridge <NUM>, an indicator portion <NUM> disposed on the back cover side of the operation arm <NUM> and formed in an arc shape along a locus of movement of the operation arm <NUM> is formed, as illustrated in <FIG> and <FIG>. Indicators 952A to 952F are formed at six locations at intervals of <NUM> degrees in the indicator portion <NUM>. Further, the train wheel bridge <NUM> is marked with a plus sign and a minus sign. Therefore, a tip of the operation arm <NUM> is provided so as to overlap the indicator portion <NUM> of the train wheel bridge <NUM> in plan view, and parts other than the tip of the operation arm <NUM> are disposed on the outer peripheral side of the train wheel bridge <NUM> in plan view.

Further, in the receiving component <NUM>, an arc-shaped groove is formed with a portion overlapping the shaft member <NUM> in plan view interposed, as illustrated in <FIG>. An outer circumference of this groove continues to the indicator portion <NUM> of the train wheel bridge <NUM>, and an arc-shaped groove is formed between the receiving component <NUM> and the indicator portion <NUM> to expose the operation arm <NUM>. Therefore, it is possible to move and operate the operation arm <NUM> by inserting a jig such as tweezers into the groove.

Next, a circuit configuration of the electronically controlled mechanical watch <NUM> will be described with reference to a block diagram of <FIG>.

The electronically controlled mechanical watch <NUM> includes the mainspring <NUM> as a mechanical energy source, and the time indication wheel train <NUM> as an energy transmission device that transmits a torque of the mainspring <NUM>, and includes a time indication device <NUM> that indicates a time, the generator <NUM> driven by a torque transmitted through the time indication wheel train <NUM>, a rectifier circuit <NUM>, a power supply circuit <NUM>, the crystal oscillator <NUM>, and the electronic control circuit <NUM>.

The electronic control circuit <NUM> is configured of an IC manufactured by a silicon on insulator (SOI) process, and includes an oscillation circuit <NUM>, a frequency divider circuit <NUM>, a rotation detection circuit <NUM>, a braking control circuit <NUM>, a constant voltage circuit <NUM>, and a temperature compensation function unit <NUM>.

The time indication device <NUM> includes the time indication wheel train <NUM>, respective hands including the hour hand 4A, the minute hand 4B, and the second hand 4C, the date wheel <NUM>, and the dial <NUM> including an indicator of each hand and a date window.

In the generator <NUM>, a magnetic flux changes as the rotor <NUM> rotates, so that induced power is generated in the coil and power generation is performed. Further, the generator <NUM> is also provided with a braking circuit that is controlled by the braking control circuit <NUM>. The brake circuit short-circuits an output terminal of the generator <NUM> to apply a short brake, thereby causing the generator <NUM> to function as a speed governor.

The rectifier circuit <NUM> is coupled to the generator <NUM>, and the electrical energy supplied from the generator <NUM> is accumulated in a power supply capacitor of the power supply circuit <NUM> via the rectifier circuit <NUM>, and the electronic control circuit <NUM> is driven with a voltage generated across the power supply capacitor (power generation voltage).

The rectifier circuit <NUM> includes a step-up rectifier, full-wave rectifier, half-wave rectifier, transistor rectifier, or the like, and boosts and rectifies an AC output from the generator <NUM> to supply the output to the power supply circuit <NUM>.

The oscillation circuit <NUM> oscillates the crystal oscillator <NUM>, which is an oscillation signal generation source. The oscillation signal of the crystal oscillator <NUM> is output to the frequency divider circuit <NUM> including flip-flops.

The frequency divider circuit <NUM> divides a frequency of the oscillation signal to generate a clock signal at a plurality of frequencies (for example, <NUM> to <NUM>), and outputs the necessary clock signal to the braking control circuit <NUM> or the temperature compensation function unit <NUM>. Here, the clock signal output from the frequency divider circuit <NUM> to the braking control circuit <NUM> is a reference signal fs1 that serves as a reference for rotation control of the rotor <NUM>, as will be described below.

The rotation detection circuit <NUM> includes a waveform shaping circuit (not illustrated) coupled to the generator <NUM>, and a mono-multivibrator, and outputs a rotation detection signal FG1 indicating a rotation frequency of the rotor <NUM> of the generator <NUM>.

The braking control circuit <NUM> compares the rotation detection signal FG1 output from the rotation detection circuit <NUM> with the reference signal fs1 output from the frequency divider circuit <NUM>, and outputs a braking control signal for regulating the speed of the generator <NUM> to the brake circuit of the generator <NUM>. The reference signal fs1 is a signal that matches a reference rotational speed (for example, <NUM>) of the rotor <NUM> at the time of normal hand movement. Therefore, the braking control circuit <NUM> changes a duty ratio of the braking control signal depending on a difference between a rotational speed of the rotor <NUM> (the rotation detection signal FG1) and the reference signal fs1, adjusts the braking force using the braking circuit, and controls the movement of the rotor <NUM>.

The constant voltage circuit <NUM> is a circuit that converts the external voltage supplied from the power supply circuit <NUM> into a constant voltage and supplies the constant voltage.

The temperature compensation function unit <NUM> compensates for temperature characteristics of the crystal oscillator <NUM> and the like to suppress variation in the oscillation frequency, and includes a temperature compensation function control circuit <NUM>, and a temperature compensation circuit <NUM>.

The temperature compensation function control circuit <NUM> operates the temperature compensation circuit <NUM> at a predetermined timing.

The temperature compensation circuit <NUM> includes a temperature sensor <NUM> that is a temperature measurement unit, a temperature correction table storage unit <NUM>, an individual difference correction data storage unit <NUM>, a calculation circuit <NUM>, a logical regulation circuit <NUM>, and a frequency adjustment control circuit <NUM>.

The temperature sensor <NUM> inputs to the calculation circuit <NUM> an output according to a temperature of an environment in which the electronically controlled mechanical watch <NUM> is used.

The temperature correction table storage unit <NUM> stores a temperature correction table in which how much the rate should be corrected at a certain temperature is set in the case of the ideal crystal oscillator <NUM> and the ideal temperature sensor <NUM>.

However, since there is an individual differences according to manufacturing in the crystal oscillator <NUM> or the temperature sensor <NUM>, individual difference correction data in which how much an individual difference should be corrected has been set based on characteristics of the crystal oscillator <NUM> or the temperature sensor <NUM> measured in a manufacturing or inspection process in advance is written to the individual difference correction data storage unit <NUM>.

The calculation circuit <NUM> uses an output (temperature) of the temperature sensor <NUM>, the temperature correction table stored in the temperature correction table storage unit <NUM>, and the individual difference correction data stored in the individual difference correction data storage unit <NUM> to calculate the rate correction amount, and outputs a result of the calculation to the logical regulation circuit <NUM> and the frequency adjustment control circuit <NUM>.

In the present embodiment, rate adjustment is performed using two methods of the logical regulation circuit <NUM> and the frequency adjustment control circuit <NUM>.

The logical regulation circuit <NUM> is a circuit that digitally lengthens or shortens a cycle of the clock signal by inputting a set or reset signal to each frequency division stage of the frequency divider circuit <NUM> at a predetermined timing.

The frequency adjustment control circuit <NUM> is a circuit that adjusts the oscillation frequency itself of the oscillation circuit <NUM> by adjusting an additional capacitance of the oscillation circuit <NUM>.

The first logical regulation setting pattern <NUM>, the second logical regulation setting pattern <NUM>, and the third logical regulation setting pattern <NUM> formed at the circuit board <NUM> are coupled to the logical regulation circuit <NUM>, and the rotary switch <NUM> that can be conducted to the logical regulation setting patterns <NUM> to <NUM> are provided.

The rotary switch <NUM> can be operated by moving the operation arm <NUM> with a jig such as tweezers, as described above. By aligning the groove <NUM> of the operation arm <NUM> with positions of the respective indicators 952A to 952F, the conduction portion <NUM> of the switch arm <NUM> can be moved to six positions and selectively come into contact with each of the patterns <NUM> to <NUM>. That is, the conduction portion <NUM> slides on a circumference with a rotation axis of the switch lever <NUM>, that is, a central axis of the rotation shaft portion <NUM> or the shaft member <NUM>, as a center by rotating the switch lever <NUM> of the rotary switch <NUM>, and the respective patterns <NUM> to <NUM> are formed at the same circumference in a sliding area of the conduction portion <NUM> that slides on the circumference. Therefore, the conduction portion <NUM> selectively comes into contact with each of the patterns <NUM> to <NUM> due to the rotation of the switch lever <NUM> of the rotary switch <NUM>.

The logical regulation circuit <NUM> of the electronic control circuit <NUM> detects which of the patterns <NUM> to <NUM> the conduction portion <NUM> is in contact with or that the conduction portion <NUM> comes into contact only with the dummy pattern <NUM> but does not come into contact with the patterns <NUM> to <NUM>, that is, detects a conduction state between the conduction portion <NUM> and the logical regulation setting patterns <NUM> to <NUM>, to adjust the logical regulation step in six stages as shown in Table <NUM>.

In Table <NUM>, the pattern AS1 indicates the first logical regulation setting pattern <NUM>, the pattern AS2 indicates the second logical regulation setting pattern <NUM>, and the pattern AS3 indicates the third logical regulation setting pattern <NUM>. The step indicates a step that is a set value of the logical regulation and, for example, when the step is changed from -<NUM> to ±<NUM> in a positive direction, the logical regulation is corrected in a forward direction, and when the step is changed in a negative direction, the logical regulation is corrected in a lagging direction. In Table <NUM>, "<NUM>" indicates that each of the patterns <NUM> to <NUM> is "coupled to VDD" or "open", and "<NUM>" indicates that each of the patterns <NUM> to <NUM> is "coupled to VSS". In the present embodiment, since a potential of the switch arm <NUM> is set to VSS, the patterns <NUM> to <NUM> with which the conduction portion <NUM> is in contact are "coupled to VSS", that is, are set to "<NUM>", and the patterns <NUM> to <NUM> with which the conduction portion <NUM> is not in contact are set to "<NUM>".

Therefore, in an after-sales service, when the back cover <NUM> is removed and the oscillating weight <NUM> is moved from a position overlapping the rotary switch <NUM>, the rotary switch <NUM> is exposed from the groove between the indicator portion <NUM> of the train wheel bridge <NUM> and the receiving component <NUM>, as illustrated in <FIG>. The switch lever <NUM> can be rotated by operating the operation arm <NUM> exposed to this groove portion using a jig such as tweezers.

When the groove <NUM> of the operation arm <NUM> is aligned with each of the indicators 952A to 952F, the conduction portion <NUM> of each switch arm <NUM> extending in a direction orthogonal to the operation arm <NUM> is moved to any one of the positions 721A to 721F in <FIG>. When the conduction portion <NUM> is moved to each of the positions 721A to 712F, each conduction portion <NUM> selectively comes into contact with each of the patterns <NUM>, <NUM>, <NUM>, and <NUM>, making it possible to set a logical regulation value. Therefore, when time accuracy is degraded due to deterioration of the crystal oscillator <NUM> over time, the switch lever <NUM> of the rotary switch <NUM> is operated to adjust the logical regulation value in the after-sales service, so that the time accuracy of the electronically controlled mechanical watch <NUM> can be maintained.

According to the present embodiment, in the electronically controlled mechanical watch <NUM> that indicates a time according to the torque from the mainspring <NUM>, which is the mechanical energy source, it is possible to change the set value of the logical regulation by operating the rotary switch <NUM>. Therefore, even when the rate changes year by year due to the aging of the crystal oscillator <NUM>, it is possible to correct an amount of rate aging change and to easily perform rate adjustment work in the after-sales service by removing the back cover <NUM> and rotating the switch lever <NUM> in the after-sales service. Therefore, by electronically regulating the speed of the time indication wheel train <NUM> while using the mainspring <NUM> as a driving source, it is possible to maintain the precision of the electronically controlled mechanical watch <NUM>, which is more accurate than that of a mechanical watch, for a long period of time by adjusting the rate in the after-sales service.

Since the rotary switch <NUM> is provided in the outer peripheral portion of the movement <NUM>, there is little interference with other components in terms of layout, and thus, a sufficient space in which the rotary switch <NUM> is disposed can be secured without increasing a diameter of the movement <NUM>.

Since the rotary switch <NUM> is provided so as not to overlap the time indication wheel train <NUM>, the winding wheel train, the switching mechanism <NUM>, the power reserve mechanism <NUM>, and the generator <NUM> in plan view, the movement <NUM>, that is, the electronically controlled mechanical watch <NUM> can be made thinner.

The shaft member <NUM>, the holding component <NUM>, and the coil spring <NUM> of the rotary switch <NUM> are disposed on the outer side of the train wheel bridge <NUM> in plan view, and a tip at which the groove <NUM> of the operation arm <NUM> of the switch lever <NUM> has been formed overlaps the indicator portion <NUM> of the train wheel bridge <NUM> in plan view, but at least a part of the operation arm <NUM>, specifically, a portion extending from the base portion <NUM> of the switch lever <NUM> to the back cover and further extending to the outer peripheral side is disposed on the outer peripheral side of the indicator portion <NUM> of the train wheel bridge <NUM> except for the tip, the operation arm <NUM> can be easily operated from a position of the receiving component <NUM>. That is, a distance from a surface on the back cover side of the receiving component <NUM> to the operation arm <NUM> is smaller than a distance from a surface on the back cover side of the train wheel bridge <NUM> to the operation arm <NUM>. Therefore, since the operation arm <NUM> can be operated from the receiving component <NUM> portion when at least a part of the operation arm <NUM> of the rotary switch <NUM> is disposed on the outer peripheral side of the train wheel bridge <NUM>, it is possible to easily operate the operation arm <NUM>, as compared with a case in which the rotary switch <NUM> is covered with the train wheel bridge <NUM>, an opening is formed in the train wheel bridge <NUM>, and the operation arm <NUM> is operated through the opening.

Since the train wheel bridge <NUM> is configured to overlap the weight body portion <NUM> of the oscillating weight <NUM> in plan view, but not to overlap the thick weight portion <NUM>, the electronically controlled mechanical watch <NUM> can be made thinner.

Further, since the rotary switch <NUM> is disposed at a position overlapping the rotation locus of the oscillating weight <NUM> in plan view, it is possible to miniature the electronically controlled mechanical watch <NUM> as compared with a case in which the rotary switch is disposed on the outer peripheral side of the rotation locus of the oscillating weight <NUM>. Further, since the oscillating weight <NUM> is movable in a rotational direction, the oscillating weight <NUM> can be manually moved to a position not overlapping the rotary switch <NUM> when the rotary switch <NUM> is operated, and thus, it is possible to operate the rotary switch <NUM> without disturbance from the oscillating weight <NUM>.

Since the train wheel bridge <NUM> is provided with an opening at a position overlapping a rotation area of the rotary switch <NUM>, and the indicator portion <NUM> is provided along this opening, and the respective indicators 952A to 952F are marked, a set position of the rotary switch <NUM> can be indicated appropriately.

Further, since the operation arm <NUM> of the rotary switch <NUM> is exposed in the arc-shaped opening between the indicator portion <NUM> of the train wheel bridge <NUM> and the receiving component <NUM>, it is possible to operate the rotary switch <NUM> in a completed state of the movement <NUM>. Therefore, in the after-sales service, it is also possible to operate the rotary switch <NUM> by removing only the back cover <NUM>, and to easily perform logical regulation value adjustment work.

The present disclosure is not limited to each the embodiments, and various modifications can be made within the scope of the gist of the present disclosure.

Although the rotary switch <NUM> is provided in the outer peripheral portion of the movement <NUM>, the rotary switch <NUM> may be provided at a place other than the outer peripheral portion of the movement <NUM>, such as a position on the center side of the movement <NUM> relative to the electronic control circuit <NUM> in the circuit board <NUM>, as long as this does not interfere with other components.

Although the rotary switch <NUM> is provided at the position not overlapping the time indication wheel train <NUM>, the generator <NUM>, a winding wheel train of the winding-up mechanism <NUM>, and the switching mechanism <NUM> in plan view, a layout in which the time indication wheel train <NUM>, the generator <NUM>, the winding wheel train of the winding-up mechanism <NUM>, a part of the switching mechanism <NUM>, and a part of the rotary switch <NUM> overlap in plan view may be adopted as long as a layout and an operation are possible.

The rotary switch <NUM> is not limited to being disposed on the outer peripheral side of the train wheel bridge <NUM>, and may be disposed at a position overlapping the train wheel bridge <NUM> in plan view. In this case, an opening for operating the rotary switch <NUM> may be formed in the train wheel bridge <NUM>.

The rotary switch <NUM> is not limited to being disposed so as to overlap the oscillating weight <NUM> in plan view, and may be disposed on the outer side of the rotation locus of the oscillating weight <NUM>. However, when the rotary switch <NUM> is disposed so as to overlap the oscillating weight <NUM> in plan view, there is an effect that it is possible to miniaturize the electronically controlled mechanical watch <NUM>.

A configuration of the rotary switch is not limited to the above embodiment, and for example, a switch lever that is rotatable by a jig such as a screwdriver may be used without the operation arm.

An electronically controlled mechanical watch according to the present includes: a mechanical energy source; a time indication device including a time indication wheel train configured to indicate a time using a transmitted torque of the mechanical energy source; a circuit board on which a crystal oscillator, an electronic control circuit configured to adjust a rotation speed of the time indication wheel train based on an oscillation frequency of the crystal oscillator, and a plurality of logical regulation setting patterns are disposed; and a rotary switch including a conduction portion allowing conduction with respect to the logical regulation setting pattern, the rotary switch being capable of selecting the logical regulation setting pattern conducting to the conduction portion by rotating with respect to the circuit board, wherein the electronic control circuit includes: an oscillation circuit configured to oscillate the crystal oscillator; a frequency divider circuit configured to divide an oscillation signal output from the oscillation circuit and output a reference signal; and a logical regulation circuit configured to control the frequency divider circuit based on a conduction state of the conduction portion and the logical regulation setting pattern.

In the electronically controlled mechanical watch, it is possible to change the set value of the logical regulation by operating the rotary switch. Therefore, even when the rate changes year by year due to the aging of the crystal oscillator, it is possible to correct the amount of rate aging change and to easily perform the rate adjustment work in the after-sales service by removing the back cover and rotating the switch lever in the after-sales service. Therefore, by electronically regulating the speed of the time indication wheel train driven by a mechanical energy source, it is possible to maintain the precision of the electronically controlled mechanical watch, which is more accurate than that of a mechanical watch, for a long period of time by adjusting the rate in the after-sales service.

In the electronically controlled mechanical watch of the present disclosure, it is preferable for the rotary switch to be provided in the outer peripheral portion of the movement accommodated in the clock case.

Since the rotary switch is provided in the outer peripheral portion of the movement, there is little interference with other components in terms of layout, and thus, a sufficient space in which the rotary switch is disposed can be secured without increasing the diameter of the movement.

It is preferable that the electronically controlled mechanical watch of the present disclosure includes a winding wheel train configured to wind up the mechanical energy source; a generator including a rotor configured to be driven by the mechanical energy source; and a switching mechanism configured to switch a transmission destination of a rotation force of a crown according to an operation for pulling the crown, wherein the rotary switch is provided so as not to overlap the time indication wheel train, the generator, the winding wheel train, and the switching mechanism in plan view.

Since the rotary switch is provided so as not to overlap the time indication wheel train, the winding wheel train, the switching mechanism, the power reserve mechanism, and the generator in plan view, the movement, that is, the electronically controlled mechanical watch, can be made thinner.

It is preferable that the electronically controlled mechanical watch of the present disclosure includes a train wheel bridge configured to hold the time indication wheel train, wherein the rotary switch includes a shaft member, and a switch lever rotatably provided with respect to the shaft member and having an operation arm, and at least part of the operation arm is disposed on the outer peripheral side of the train wheel bridge in plan view.

Since the rotary switch includes the shaft member and the switch lever, and at least a part of the operation arm of the switch lever is disposed on the outer peripheral side of the train wheel bridge in plan view, the operation arm can be easily operated.

It is preferable that the electronically controlled mechanical watch of the present disclosure includes a train wheel bridge configured to hold the time indication wheel train; a winding wheel train configured to wind up the mechanical energy source; and a oscillating weight configured to drive the winding wheel train, wherein the oscillating weight includes a weight body portion and a weight portion that is provided on the outer peripheral side of the weight body portion and thicker than the weight body portion, and the train wheel bridge overlaps the weight body portion and does not overlap with the weight portion in plan view.

Since the train wheel bridge overlaps the weight body portion of the oscillating weight in plan view, but is configured not to overlap the thick weight portion, the electronically controlled mechanical watch can be made thinner.

It is preferable that the electronically controlled mechanical watch of the present disclosure includes a train wheel bridge configured to hold the time indication wheel train; a winding wheel train configured to wind up the mechanical energy source; and a oscillating weight configured to drive the winding wheel train, wherein the electronically controlled mechanical watch, and the rotary switch is disposed so as to overlap the oscillating weight in plan view.

Since the rotary switch is disposed at the position overlapping the rotation locus of the oscillating weight in plan view, it is possible to miniaturize the electronically controlled mechanical watch as compared with a case in which the rotary switch is disposed on the outer peripheral side of the rotation locus of the oscillating weight. Further, since the oscillating weight is movable in the rotational direction, the oscillating weight can be manually moved to a position not overlapping the rotary switch when the rotary switch is operated, and thus, it is possible to operate the rotary switch without disturbance from the oscillating weight.

It is preferable that the electronically controlled mechanical watch of the present disclosure includes a train wheel bridge configured to hold the time indication wheel train, wherein the train wheel bridge is provided with an opening at a position overlapping a rotation area of the rotary switch, and an indicator indicating a set position of the rotary switch is marked along the opening.

Claim 1:
An electronically controlled mechanical watch (<NUM>), comprising:
A mechanical energy source (<NUM>);
a time indication device including a time indication wheel train (<NUM>) configured to indicate a time using a transmitted torque of the mechanical energy source;
a circuit board (<NUM>) on which a crystal oscillator (<NUM>), an electronic control circuit (<NUM>) configured to adjust a rotation speed of the time indication wheel train (<NUM>) based on an oscillation frequency of the crystal oscillator (<NUM>), and a plurality of logical regulation setting patterns (<NUM>, <NUM>, <NUM>, <NUM>) are disposed; and
wherein the electronic control circuit (<NUM>) includes:
an oscillation circuit (<NUM>) configured to oscillate the crystal oscillator (<NUM>);
a frequency divider circuit (<NUM>) configured to divide an oscillation signal output from the oscillation circuit and output a reference signal (fs1);
characterized in that the electrically controlled mechanical timepiece (<NUM>) further comprises a rotary switch (<NUM>) including a conduction portion configured to conduct to the plurality of logical regulation setting patterns (<NUM>, <NUM>, <NUM>, <NUM>), the rotary switch being configured to rotate with respect to the circuit board to select a logical regulation setting pattern, of the plurality of logical regulation setting patterns, conducting to the conduction portion,
and in that the electronic control circuit (<NUM>) includes a logical regulation circuit (<NUM>) configured to control the frequency divider circuit (<NUM>) based on a conduction state of the conduction portion and the logical regulation setting pattern.