JP2007132822A - Electronic watch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic watch that maintains high radio wave receiving performance and is reduced in size regarding to the electronic watch having a radio wave receiving antenna for receiving radio information and a plurality of motors. <P>SOLUTION: The electronic watch is provided with a receiving antenna and a plurality of electromagnetic motors for respectively driving a plurality of pointers. The electromagnetic motors include a second hand driving motor 240 for indicating a receiving state during receiving radio waves by the receiving antenna, an hour and minute hand driving motor 230 for stopping a drive during receiving radio waves by the receiving antenna 300, and a CG minute hand driving motor 260. The second hand driving motor 240 is arranged at a farther position than the hour and minute hand driving motor 230 and the CG minute hand driving motor 260 from the receiving antenna 300. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to an electronic timepiece.
In particular, the present invention relates to an electronic timepiece having a reception function for receiving wireless information.

As an electronic timepiece having a function of receiving wireless information, for example, a radio timepiece that receives time information transmitted wirelessly (standard radio waves) and corrects the time is known.
Such a radio-controlled timepiece includes a receiving antenna that receives radio waves and a time display motor that drives a time display unit.
Here, when the time display motor is driven, a magnetic field is generated from the motor.
Since the magnetic field generated from the motor becomes noise with respect to the standard radio wave, there is a possibility of adversely affecting the radio wave receiving operation by the receiving antenna.
Therefore, an arrangement in which the time display motor and the reception antenna are separated as much as possible is known so that the magnetic field generated from the time display motor does not affect the reception operation by the reception antenna (for example, Patent Document 1).

JP 2003-121568 A

Here, a timepiece with a chronograph is known for the purpose of making the timepiece multifunctional. In such a timepiece with a chronograph, a plurality of motors are provided.
Of course, in order to keep the receiving performance of the receiving antenna high, it is easy to arrange all the motors sufficiently away from the receiving antenna.
However, if all the motors are sufficiently separated from the receiving antenna, there arises a problem that the timepiece becomes very large.
In particular, in a small timepiece such as a wristwatch, since many parts must be arranged in a limited space, it is impossible to sufficiently separate all the motors from the receiving antenna.
For this reason, it has been difficult to increase the number of motors in an electronic timepiece having a function of receiving wireless information and to increase the number of motors while maintaining high radio wave reception performance.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic timepiece that has a radio wave receiving antenna for receiving wireless information and a plurality of motors, and maintains a high radio wave reception performance and is downsized.

  An electronic timepiece according to the present invention is an electronic timepiece including a receiving antenna that receives radio waves, a display unit that displays a plurality of information using a plurality of hands, and a plurality of electromagnetic motors that respectively drive the plurality of hands. As the electromagnetic motor, there are provided a multi-drive motor that has a relatively large number of times of driving during radio wave reception and a small drive motor that has a smaller number of times of driving during radio wave reception than the multi-drive motor or whose driving is stopped. The multi-drive motor is arranged at a position farther from the receiving antenna than the small drive motor in a plan view and / or a cross-sectional view.

Here, the “motor with a large number of driving times” refers to a motor with a large number of pointer steps during radio wave reception. As a combination of a multi-drive motor and a small-drive motor, for example, a multi-drive motor is a motor that always drives and displays a normal time, and a low-drive motor is a chronograph, timer, alarm setting, etc. other than the normal time display A motor that performs multi-function display and is relatively infrequently used.
For example, when performing normal time display, the multi-drive motor is a second motor that moves every second, and the small drive motor is, for example, an hour / minute motor that is driven every 5 to 20 seconds.
Information displayed by each pointer driven by a plurality of electromagnetic motors includes, for example, the normal hour, minute, and second of the current time, as well as the chronograph hour, minute, second, and alarm time as a stopwatch function An example is time for setting.

The receiving antenna receives radio waves transmitted from the outside, and acquires information included in the radio waves. An example of the radio wave is a standard radio wave.
Examples of information displayed during reception include, for example, radio wave reception intensity during reception of radio waves by the reception antenna, normal current time, hour, minute, and second.
In accordance with this, the operation of the electromagnetic motor is driven to display the radio wave reception intensity during reception of radio waves by the receiving antenna and to display the hour, minute and second at the normal current time, or Stop driving.

  In the present invention, an electromagnetic motor that is driven while receiving radio waves at the receiving antenna is arranged at a position far from the receiving antenna, so that the magnetic field generated from the electromagnetic motor is linked to the receiving antenna. The number of times noise is mixed with the radio wave information received by the receiving antenna is eliminated, and there is no possibility of receiving radio waves accurately, and the receiving performance of the receiving antenna can be kept high.

  An electronic timepiece according to the present invention is an electronic timepiece including a receiving antenna that receives radio waves, a display unit that displays a plurality of information using a plurality of hands, and a plurality of electromagnetic motors that respectively drive the plurality of hands. In addition, as the electromagnetic motor, a multi-drive motor having a relatively large number of output pulses during driving while receiving radio waves, and a number of output pulses during driving while receiving radio waves being smaller than or equal to the number of output pulses. Is provided, and the multi-drive motor is disposed at a position farther from the receiving antenna than the small drive motor in a plan view and / or a cross-sectional view.

In the present invention, the reason why a plurality of fine pulses having a rectangular wave shape are output as one-step driving pulses during driving is to reduce the power consumption of the electromagnetic motor. When an electromagnetic motor that produces many rectangular-wave-like fine pulses is placed near the receiving antenna, the number of times that the magnetic field generated by the electromagnetic motor is linked to the receiving antenna, or noise is mixed with the radio wave information received by the receiving antenna. Will increase.
The output pulse may be driven with one pulse in one step. In short, during radio wave reception, the number of fine pulses and the total number of one pulse in one step are to be compared.
In this regard, in the present invention, the electromagnetic motor having a large number of output pulses is arranged at a position farther from the receiving antenna than the small drive motor having a small number of output pulses while receiving the radio wave by the receiving antenna. The number of pulses output near the antenna during reception decreases, and the number of times that the magnetic field generated from the electromagnetic motor is linked to the reception antenna or noise is mixed with radio wave information received by the reception antenna is reduced. Therefore, there is no possibility that radio waves cannot be received accurately, and the reception performance of the receiving antenna can be kept high.

  An electronic timepiece according to the present invention is an electronic timepiece including a receiving antenna that receives radio waves, a display unit that displays a plurality of information using a plurality of hands, and a plurality of electromagnetic motors that respectively drive the plurality of hands. As the electromagnetic motor, a multi-drive motor that is driven with a relatively large drive power during the reception of the radio wave, and a drive power that is smaller than the drive power of the multi-drive motor or that is driven during the reception of the radio wave. A small drive motor that is stopped, and the multi-drive motor is arranged at a position farther from the receiving antenna than the small drive motor in a plan view and / or a cross-sectional view.

In the present invention, an electromagnetic motor (multi-drive motor) driven with a large driving power while receiving a radio wave with the receiving antenna is more separated from the receiving antenna than a small drive motor driven with a small driving power. Disposed at a distant position.
Therefore, the electric power at the time of driving the motor driven near the receiving antenna is reduced, and the SN ratio is increased even if noise is applied to the radio wave information received by the receiving antenna. As a result, there is no possibility that radio waves cannot be received accurately, and the reception performance of the receiving antenna can be kept high.

  An electronic timepiece according to the present invention is an electronic timepiece including a receiving antenna that receives radio waves, a display unit that displays a plurality of information using a plurality of hands, and a plurality of electromagnetic motors that respectively drive the plurality of hands. A long electromagnetic motor having a longer drive motor coil or stator and a short electromagnetic motor having a shorter drive motor coil or stator, the long electromagnetic motor in plan view and / or sectional view. Is arranged at a distance farther from the receiving antenna than the short electromagnetic motor.

In such a configuration, an electromagnetic motor having a longer motor coil or stator is disposed at a position farther from the receiving antenna.
An electromagnetic motor having a long motor coil or stator generates a strong magnetic field. If such an electromagnetic motor is located near the receiving antenna, noise is likely to be carried on radio waves received by the receiving antenna.
In this regard, according to the configuration of the present invention, it is difficult for electromagnetic noise to be superimposed on the receiving antenna during reception, and the SN ratio is improved.
Even if the driving of the electromagnetic motor is stopped during reception, radio waves (electromagnetic waves, etc.) sent from the outside that the receiving antenna should receive are drawn into the stator or coil core of the electromagnetic motor made of a high permeability material. The amount of radio waves that can be received by the antenna decreases. Therefore, an output signal for radio wave reception is output from the receiving antenna. However, if a large electromagnetic motor is located near the receiving antenna, the level of the output signal from the receiving antenna is likely to decrease even when the motor is stopped. . Therefore, also from this point, it is desirable that the larger the motor, the farther away from the receiving antenna.

  In the present invention, the long electromagnetic motor is a multi-drive motor that has a higher number of times of driving during radio wave reception, and the short electromagnetic motor has a lower number of times of driving during radio wave reception than the multi-drive motor, or is stopped. It is preferable to be a small drive motor.

  In the present invention, the long electromagnetic motor is a multi-drive motor having a large number of output pulses during driving during radio wave reception, and the short electromagnetic motor has a number of output pulses during driving during radio wave reception in the multi-drive motor. It is preferable that the number of motors is small or the number of output pulses is zero.

  In the present invention, the long electromagnetic motor is a multi-drive motor driven with a relatively large drive power during the radio wave reception, and the short electromagnetic motor is more than the drive power of the multi-drive motor during the radio wave reception. A small drive motor that is driven with a small drive power or is stopped is preferable.

  In the present invention, it is preferable that the multi-drive motor drives a pointer that displays a reception state while the radio wave is being received by the reception antenna.

In such a configuration, the multi-drive motor is driven at a predetermined timing even while radio waves are being received by the receiving antenna.
The multi-drive motor drives a pointer (multi-drive pointer) for displaying the radio wave reception state at the receiving antenna, and indicates the reception state on the display unit.
Here, examples of the reception state include reception sensitivity, reception success / failure, and direction of the receiving station.
In this way, by displaying the reception status by driving the pointer during radio wave reception by the multi-drive motor, it is possible to inform the user of the radio wave reception status, for example, a watch to improve the radio wave reception status. The user can be prompted to change the orientation or location of the user.

  In the present invention, the small drive motor is driven with a longer drive cycle than the multi-drive motor during normal driving when the reception antenna does not receive the radio wave, and the radio wave is received by the reception antenna. It is preferable to continue driving during normal driving.

In such a configuration, for example, the small drive motor is a motor for driving the minute hand and the hour hand and has a long drive cycle.
Such a small drive motor has a small number of times of generating a magnetic field even if it is driven while receiving radio waves at the receiving antenna, so if the small drive motor is placed near the receiving antenna Even if the normal driving is continued, the influence on the radio wave reception of the receiving antenna is small.
Therefore, by driving the small drive motor during radio wave reception by the receiving antenna, it is possible to display necessary information on the display unit without completely stopping display of information during radio wave reception.

  In the present invention, a first small drive motor and a second small drive motor having a longer drive cycle than the small drive motor are provided as the small drive motor, and the first small drive motor is provided by the second drive motor. Is also preferably arranged at a position far from the receiving antenna.

  In such a configuration, an electromagnetic motor having a bad influence on reception is arranged at a position far from the receiving antenna, while an electromagnetic motor having a low influence on reception is arranged at a position near the receiving antenna so that a plurality of electromagnetic motors are arranged. Even if it is equipped, it is possible to reduce the overall size while maintaining high reception performance of the receiving antenna.

In the present invention,
Preferably, the multi-drive motor is a second hand drive motor, the first small drive motor is a minute hand drive motor, and the second small drive motor is an hour hand drive motor.

In such a configuration, the second hand is normally driven by a multi-drive motor (second hand drive motor), and the second hand driven by the multi-drive motor displays the radio wave reception intensity during radio wave reception.
The minute hand is driven by the first small drive motor (minute hand drive motor), the hour hand is driven by the second small drive motor (hour hand drive motor), and the first small drive motor (minute hand drive motor) and the second Driving of the hour hand and the minute hand by the small driving motor (hour hand driving motor) is continued even during reception of radio waves.
Multi-drive motors (second hand drive motors) continue to drive a predetermined number of times or more during radio wave reception, but are located far from the receiving antenna, so the magnetic field generated by the multi-drive motor has an effect on the receiving antenna. There are few.
Although the first small drive motor (minute hand drive motor) and the second small drive motor (hour hand drive motor) continue to be driven during radio wave reception, the drive cycle required to drive the hour hand and minute hand is long. Even if it is arranged closer to the receiving antenna than the multi-drive motor, the influence on the receiving antenna is small.

  In the present invention, it is preferable that the first small driving motor is driven with a driving cycle longer than a normal driving cycle while the radio wave is received by the receiving antenna.

  For example, when the time from the start of driving of the electromagnetic motor to the start of the next drive is 5 seconds when no radio wave is received, the electromagnetic motor is driven 12 times during 1 minute. If the driving is continued as it is, the information received by the receiving antenna may be mixed with noise 12 times per minute. On the other hand, noise is mixed in the information received by the receiving antenna by making the time from the start of driving of the electromagnetic motor when receiving radio waves longer than the time when not receiving radio waves. The possibility is reduced, and more reliable radio wave information can be acquired.

  Also, when there are multiple electromagnetic motors and they are driven while receiving radio waves, they are received by the receiving antenna by driving the time from the start of driving of the plurality of electromagnetic motors to the next drive in one time. The possibility that noise is mixed with information is reduced, and more reliable radio wave information can be acquired.

  In the present invention, the small drive motor is disposed in the vicinity of the end of the reception antenna, and the motor coil of the small drive motor is disposed between the stator of the small drive motor and the reception antenna. preferable.

Reception of radio waves transmitted from the outside is performed by interlinkage magnetic flux that converges the magnetic flux from the outside to the end of the receiving antenna, but if a highly permeable member such as a stator is close to the receiving antenna, A lot of the magnetic flux from is converged on the stator, and the interlinkage magnetic flux of the receiving antenna is reduced.
In this respect, in the present invention, the linkage magnetic flux of the receiving antenna can be increased by separating the stator from the end of the receiving antenna, and the receiving performance of the receiving antenna can be maintained high.
When driving an electromagnetic motor while receiving radio waves at the receiving antenna, the magnetic field generated by the electromagnetic motor is linked to the receiving antenna, and noise is mixed with the information of the radio waves received by the receiving antenna, so that the radio waves are accurately However, if a stator that is a high magnetic permeability member is disposed near the end of the antenna, such a situation is likely to occur. That is, the magnetic flux generated from the electromagnetic motor coil flows through the stator, which is a highly permeable member located on the opposite side of the motor coil from the receiving antenna, and returns to the other end of the electromagnetic motor coil again. A magnetic circuit in which the magnetic flux flows into the end of the receiving antenna is formed, so that the magnetic flux generated from the electromagnetic motor is not converged on the electromagnetic motor coil. This tends to cause a reduction in motor output.
Furthermore, since the motor coil is disposed between the stator and the receiving antenna, it is possible to prevent the magnetic flux generated from the electromagnetic motor flowing from the stator that is a high permeability member from flowing into the receiving antenna.
Therefore, it is possible to drive the pointer during radio wave reception while maintaining the reception performance of the reception antenna high. For example, the reception intensity can be displayed to notify the user of the radio wave reception state.

  In the present invention, the small drive motor includes a motor coil that generates an induced magnetic field, a stator that transmits the induced magnetic field from the motor coil, and a rotor that is rotatably disposed in a hole portion of the stator and rotated by the induced magnetic field. The small drive motor is preferably arranged in a direction in which the axis of the motor coil of the small drive motor intersects at an angle of 60 degrees to 120 degrees with respect to the axial direction of the coil of the receiving antenna.

A magnetic field is generated from the receiving antenna while the receiving antenna is receiving radio waves.
When the metal part is disposed near the receiving antenna, the magnetic flux generated from the receiving antenna flows in the metal part, and an eddy current is generated in the metal part due to the change of the magnetic flux, resulting in loss. Furthermore, in the case of a coil in which a copper wire is wound around a metal part (for example, a motor coil), an induced current is generated in the coil by the magnetic flux of the receiving antenna, and the magnetic flux generated by this induced current is the interlinkage magnetic flux of the receiving antenna. Therefore, the loss is more than that of metal parts.
In this regard, in the present invention, by arranging the coil (for example, motor coil) at an angle of 60 degrees or more and 120 degrees or less with respect to the magnetic flux generated from the receiving antenna, the magnetic flux linked to the coil (for example, the motor coil) is As much as possible, the reception performance of the receiving antenna can be kept high.
Furthermore, because of the arrangement of the receiving antenna and the motor coil, the magnetic field generated by driving the motor coil intersects the coil axis of the receiving antenna in the range of 60 degrees to 120 degrees. Does not pass through the coil.
Therefore, the induction current is hardly generated in the coil of the reception antenna due to the magnetic field from the motor coil, and the reception performance of the reception antenna can be kept high. The angle is more preferably in the range of 75 degrees to 105 degrees, and still more preferably in the range of 85 degrees to 95 degrees.

  In the present invention, the small drive motor includes a motor coil that generates an induced magnetic field, a stator that transmits the induced magnetic field from the motor coil, and a rotor that is disposed in a hole portion of the stator and is rotated by the induced magnetic field. The rotor is magnetized in two poles, and the magnetic pole direction when the rotor is stopped at a stable position when not rotating is substantially orthogonal to the direction of the magnetic flux lines flowing into the coil core of the receiving antenna. Or it is preferable that it is substantially parallel.

While the receiving antenna is receiving radio waves, a magnetic field is formed on the receiving antenna.
Here, when this magnetic field reaches the rotor, it becomes a force such as swinging the rotor, and the rotor is shifted from the stable position, such as swinging the rotor that is stationary in a static stable state.
In this respect, in the present invention, since the magnetic pole direction (NS direction) of the rotor is orthogonal or parallel to the magnetic flux flowing into the coil core of the receiving antenna, an extra force is applied to the rotor in a statically stable state. Therefore, the position of the rotor can be maintained.
As a result, the next time the drive motor is driven, the operation of the rotor can be accurately controlled, and stable pointer display can be performed.

  The present invention includes an exterior case made of metal, a back cover made of metal, and a dial plate made of a non-conductive material, and the receiving antenna is arranged on the dial side in a sectional view. In addition, it is preferable that the multi-drive motor is disposed on the back cover side.

  In this case, the dial may be a light transmissive member, and a photoelectric conversion panel (solar power generation panel) may be disposed on the back of the dial.

  On the contrary, in the present invention, a main body case that houses a receiving antenna and a plurality of electromagnetic motors is provided, a dial plate made of a metallic member is disposed on the front side of the main body case, and a non-back side of the main body case is not provided. It is preferable that a back cover made of a metallic member is disposed, the receiving antenna is disposed on the back cover side, and the electromagnetic motor is disposed on the dial side.

According to such a configuration, the distance between the receiving antenna and the electromagnetic motor can be increased by separating the receiving antenna and the electromagnetic motor even in the cross-sectional direction.
And the receiving performance of an electromagnetic wave can be maintained high by arrange | positioning a receiving antenna in the position far from a metallic member.

  In the present invention, a ground plate on which the receiving antenna and the plurality of electromagnetic motors are mounted is provided, and the receiving antenna and the multi-drive motor are opposite to each other with the center of the ground plate or the movement in plan view. It is preferable to arrange | position along the outer periphery of the said ground plate or a movement.

In such a configuration, the receiving antenna and the multi-drive motor are arranged on the opposite side with the center of the ground plate or the movement in between. For example, when the receiving antenna is arranged in the 12 o'clock direction, the multi-drive motor is 6 As it is arranged in the time direction, it means that the receiving antenna and the multi-drive motor are arranged on a diameter line passing through the center of the main plate or the movement.
And arrange | positioning a receiving antenna and a multi-drive motor along the outer periphery of a ground plane or a movement means arrange | positioning a receiving antenna and a multi-drive motor in the outermost periphery of a ground plane or a movement.
That is, when the receiving antenna and the multi-drive motor are arranged on the opposite side of the base plate or the movement and along the outer periphery of the base plate or the movement, the receiving antenna and the multi-drive motor are arranged farthest from each other. Become.
As a result, the magnetic field generated from the multi-drive motor is less likely to be linked to the reception antenna, and the reception performance of the reception antenna can be kept high without being greatly affected by the presence of the multi-drive motor.

  In the present invention, when there are a plurality of motors, it is preferable to reduce the number of motors close to the receiving antenna. For example, when the receiving antenna and the plurality of motors are arranged on a circular ground plate or a movement, It is preferable that M <N, where M is the number of motors arranged in the semicircle on the antenna side and N is the number of motors arranged in the semicircle on the side opposite to the receiving antenna.

In such a configuration, by reducing the number of motors arranged near the receiving antenna as much as possible, the influence of the magnetic field generated from the motor on the receiving antenna can be reduced, and the receiving performance of the receiving antenna can be maintained high. .
And since the motor arrange | positioned at the semicircle by the side of a receiving antenna is smaller than the motor arrange | positioned by the semicircle on the opposite side to a receiving antenna, the receiving performance of a receiving antenna can be maintained more highly.
Also, by disposing many motors at a distance far from the receiving antenna, the number of motors that can be driven during radio wave reception can be increased and the types of information that can be displayed during reception can be increased.

  In the present invention, it is preferable that the small driving motor stops driving while the radio wave is received by the receiving antenna.

In such a configuration, it is preferable that the small drive motor disposed closer to the receiving antenna than the multi-drive motor stops driving while receiving radio waves.
Then, since the small drive motor does not generate a magnetic field during reception of radio waves, the reception performance of the reception antenna can be kept high.

  In the present invention, the length of the small drive motor coil or the multiple drive motor coil is preferably shorter than the length of the receiving antenna.

  According to such a configuration, the magnetic field generated from the small drive motor or the multiple drive motor can be reduced, and the influence of the magnetic field on the receiving antenna can be reduced.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be illustrated and described with reference to reference numerals attached to respective elements in the drawings.
(First embodiment)
A radio timepiece (electronic timepiece) 100 as a first embodiment of the present invention will be described.
FIG. 1 is a front view of the radio timepiece 100.
FIG. 2 is a view in which the back cover of the radio timepiece 100 is removed.
This radio-controlled timepiece 100 is a wristwatch and has a function of automatically adjusting the time by receiving a standard radio wave, and includes three small display units in addition to a normal time display unit that displays a normal hour and minute. Has a chronograph function for displaying various information.

  A radio-controlled timepiece 100 includes a main body case 110 as a base frame, a timepiece movement 200 disposed inside the main body case 110, and a receiving antenna 300 that receives standard radio waves including time information as radio information (radio waves). .

The main body case 110 has a substantially ring shape and is made of a non-conductive material such as a synthetic resin or ceramic, or a diamagnetic material such as brass or a gold alloy. The display unit 120 shown in FIG.
A mounting portion 111 for attaching a wristwatch band is formed at positions opposite to each other on the outer periphery of the main body case 110.
A switching operation member 170 and two button members 181 and 182 sandwiching the switching operation member 170 are provided on the outer surface of the main body case 110.
The switching operation member 170 is provided at the 3 o'clock position and operates in accordance with the crown winding stem 171 provided through the main body case 110 and the push-pull operation of the winding stem 171 provided inside the main body case 110. A switching unit 172.
As the button member, an A button 181 arranged at 2 o'clock with a crown in between and a B button 182 arranged at 4 o'clock are provided.
The switching operation member 170 is used for time adjustment, and the A button 181 and the B button 182 are used for forced reception of standard radio waves, stopwatch operation of a chronograph function, and the like.

  The display unit 120 includes an hour / minute display unit 130 that displays the hour / minute of the normal time centered on the center point of the main body case 110, a second display unit 140 that is arranged at the 9 o'clock position and displays the second of the normal time, A CG second display unit 150 arranged at the hour position for displaying chronograph seconds and a CG minute display unit 160 arranged at the 12 o'clock position for displaying chronograph minutes are provided.

The hour / minute display unit 130 includes a scale 131 provided around the great circle of the display unit 120, an hour hand 132, and a minute hand 133.
The second display unit 140 includes a scale 141 provided around a small circle and a second hand 142.
The CG second display unit 150 includes a scale 151 provided around the small circle and a CG second hand 152.
The CG minute display unit 160 includes a scale 161 provided around a small circle and a CG minute hand 162.

Here, during the reception of the standard radio wave, the second display unit 140 functions as an indicator that stops the display of the second time and displays the reception state.
When functioning as a reception status indicator in the second display unit 140, the 30 second position 143 means the reception impossible state, the 60 second position (00 second position) 144 means the best reception state, and depends on the reception level. The indication position of the second hand 142 is changed every moment.

With reference to FIG. 2, the internal configuration of the radio timepiece will be described.
The watch movement 200 includes a battery 210 as a power source, a drive unit 220 driven by the power of the battery, a circuit block 280 on which crystal oscillators 281, 282, and 283 and a control IC 284 are mounted. And a plastic base plate 285 and a plastic train wheel bridge (not shown).

The battery 210 has a conventionally known configuration, and the case (outer can) of the battery 210 is formed of a button-type metal ferromagnetic material.
For example, SUS304 (stainless steel) or the like can be used as the ferromagnetic material forming the case of the battery 210.
The battery 210 may be a solid electrolyte battery that can be bent or bent.

  The drive unit 220 includes a plurality of motors 230 to 260 and a train wheel 270 that transmits the power of each motor.

  As motors, an hour / minute hand drive motor 230 for driving the hour hand 132 and the minute hand 133 of the hour / minute display unit 130, a second hand drive motor 240 for driving the second hand 142 of the second display unit 140, and a CG second hand 152 of the CG second display unit 150. A CG second hand driving motor 250 for driving the CG and a CG minute hand driving motor 260 for driving the CG minute hand 162 of the CG minute display unit 160 are disposed.

Here, the hour / minute hand driving motor 230 normally drives the minute hand 133 and the hour hand 132 by driving one pulse every 10 seconds, but stops the driving while the standard radio wave is being received by the receiving antenna 300. It is a small drive motor. The second hand 142 is stopped when it reaches a position indicating the reception state.
The second hand drive motor 240 normally drives the second hand 142 by driving one pulse per second, and drives the second hand 142 by driving one pulse per second even while the standard radio wave is received by the receiving antenna 300. This is a multi-drive motor that displays the reception state.
The CG second hand drive motor 250 and the CG minute hand drive motor 260 are motors that are driven only when the switching operation member 170 is set to a predetermined operation mode (CG mode). During the operation, the drive motor is stopped.

  Basically, the configuration of each of the motors 230 to 260 is the same, and the motor coils 231, 241, 251, 261 that generate the induced magnetic field, and the stators 232, 242 that transmit the induced magnetic field from the motor coils 231, 241, 251, 261. 252 and 262, and rotors 233, 243, 253, and 263 that are rotatably disposed in the hole portions of the stators 232, 242, 252, and 262 and are rotated by the induced magnetic field.

  The arrangement of the motors 230 to 260 will be described later together with the relative position with respect to the receiving antenna 300.

The train wheel 270 includes a train wheel 271 that transmits power from the hour / minute hand drive motor 230 to the hour / minute hands 132 and 133, a train wheel 272 that transmits power from the second hand drive motor 240 to the second hand 142, and a CG second hand drive motor 250. A train wheel 273 that transmits power to the CG second hand 152 and a train wheel 274 that transmits power from the CG minute hand drive motor 260 to the CG minute hand 162 are provided.
The gear train of the train wheel 270 is mainly formed of a steel material such as carbon steel or stainless steel.

The circuit block 280 includes crystal resonators 281 to 283 that oscillate at a constant period, a control IC 284, and the like.
As the quartz oscillator, a timing quartz oscillator 281 that oscillates a reference clock, and tuning quartz oscillators 282 and 283 for generating tuning signals that are tuned to the frequency of the standard radio wave are provided.
For example, in Japan, two quartz crystal resonators 282 for tuning to a standard radio wave of 60 kHz and a crystal resonator 283 for tuning to a standard radio wave of 40 kHz are provided in Japan.
For example, in Europe and the United States, a 60 kHz crystal resonator and a 77.5 kHz crystal resonator are used.
The control IC 284 divides the frequency from the crystal oscillator 281 to generate a reference clock, the time counting circuit that counts the reference clock to measure the time, and is driven based on the signal from the time measuring circuit. A control circuit for controlling the motor of the unit 220 and a receiving circuit for processing (amplifying, demodulating, etc.) time information received by the receiving antenna 300 are provided.
The control IC 284 may share a possible circuit portion, or may be configured by a software or the like instead of an analog circuit.
Here, the quartz oscillator 281, the frequency dividing circuit, and the timing circuit constitute a timing mechanism.

The receiving antenna 300 includes an antenna core 310 made of ferrite and a receiving coil 320 in which a coil is wound around the antenna core 310.
The antenna core 310 of the receiving antenna 300 may be formed of ferrite, amorphous metal, SUY (electromagnetic soft iron), or the like.
For example, when the antenna core 310 of the receiving antenna 300 is made of electromagnetic soft iron, there is an advantage in making it curved along the shape of the main body case 110.
The time information (wireless information) received by the receiving antenna 300 is output to the receiving circuit of the control IC 284 for signal processing.
Therefore, the receiving mechanism is constituted by the receiving antenna 300 and the receiving circuit of the control IC 284.
As the time information received by the receiving antenna 300, for example, a long wave standard radio wave (JJY) can be used.

Next, the layout of each component such as the motors 230 to 260 and the receiving antenna 300 will be described.
First, the arrangement of each component will be described.
The receiving antenna 300 is arranged close to the outer periphery of the ground plane 285 at the 12:00 side. The direction of the receiving antenna 300 is parallel to the direction from 3 o'clock to 9 o'clock.
The hour / minute hand drive motor 230 is disposed between 10:00 and 11:00.
The CG minute hand drive motor 260 is disposed between 1 o'clock and 2 o'clock.
The second hand drive motor 240 is disposed between 8 o'clock and 7 o'clock.
The CG second hand drive motor 250 is disposed between 6 o'clock and 5 o'clock.

  That is, the second hand drive motor 240 that is a multi-drive motor is disposed at a position far from the receiving antenna 300, and the second hand drive motor 240 is received compared to the hour / minute hand drive motor 230 and the CG minute hand drive motor 260 that are small drive motors. It is arranged at a position far from the antenna 300.

The battery 210 is disposed on the 4 o'clock side.
The winding stem 171 of the switching operation member 170 is provided at the 3 o'clock position, and the switching unit 172 is disposed between 2 o'clock and 3 o'clock.
The timing crystal resonator 281 is disposed close to the outer periphery of the main plate 285 between 6 o'clock and 7 o'clock.
The control IC 284 is disposed adjacent to the outer periphery of the main plate 285 in the 7 o'clock direction, and is disposed adjacent to the timing crystal resonator 281.
Further, the tuning crystal resonators 282 and 283 of 40 kHz and 60 kHz are disposed on the opposite side of the timing crystal resonator 281 with the control IC 284 therebetween.

Next, the direction of the motors 230 to 260 will be described.
The hour / minute hand driving motor 230 and the CG minute hand driving motor 260 disposed near the receiving antenna 300 include motor coils 231 and 261, stators 232 and 262, and rotors 233 and 263. Are arranged in a direction substantially perpendicular to the magnetic field generated from the receiving antenna 300.
When viewed along the magnetic field generated from the receiving antenna 300, the motor coils 231 and 261 are disposed between the receiving antenna 300 and the stators 232 and 262, that is, the stators 232 and 262 are connected to the end of the receiving antenna 300. It is separated from the part.
Further, the hour / minute hand driving motor 230 and the CG minute hand driving motor 260 are arranged so that the axis of the motor coil of the small driving motor intersects at an angle of 60 degrees to 120 degrees with respect to the axial direction of the coil of the receiving antenna 300. .
The crossing angle between the axial direction of the coil of the receiving antenna 300 and the axis of the motor coil of the small drive motor may be in the range of 75 to 105 degrees, or may be in the range of 85 to 95 degrees.

Further, the rotors 233 and 263 are magnetized in two poles, and in a static stable state where no induced magnetic field is generated from the motor coils 231 and 261, the rotors 233 and 263 are stopped without rotating in the hole portions of the stators 232 and 262.
The magnetic pole directions of the rotors 233 and 263 in the static stable state are substantially parallel to the magnetic field generated from the receiving antenna 300.
The magnetic pole direction of the rotors 233 and 263 in the static stable state can be adjusted by changing the position or angle of the notches formed in the stators 232 and 262.
In the present embodiment, in order to make the magnetic pole direction of the rotors 233 and 263 in the static stable state substantially parallel to the magnetic field from the receiving antenna 300, the shape of the stators 232 and 262 is devised. Curved portions 232A and 262A are formed before and after the portion provided with the rotor hole of H.263 so that a line connecting outer notches forms a predetermined angle with respect to the magnetic field from the receiving antenna 300.
Note that the magnetic pole direction of the rotor may be orthogonal to the magnetic field from the receiving antenna 300.

The second hand drive motor 240 includes a motor coil 241, a stator 242, and a rotor 243. The motor coil 241 is arranged in a direction substantially parallel to a direction connecting 9:00 and 5:00.
The parts around the second hand drive motor 240 are arranged at positions that assist the formation of a magnetic circuit in which the magnetic field generated from one end of the motor coil 241 does not reach the receiving antenna 300 and returns to the other end of the motor coil 241 again. Has been.
Specifically, the magnetic field emitted from one end of the motor coil 241 is transmitted through the trains 272 and 271, the stator 262 of the CG minute hand drive motor 260, the switching operation member 170, the battery 210, and the train wheel 273 in this order. Return to the other end.
Here, the train wheel 272 and 271, the stator 262 of the CG minute hand drive motor 260, the switching operation member 170, the battery 210 and the train wheel 273 constitute magnetic circuit formation assisting means.

Next, the operation of the radio timepiece 100 will be described.
The operation mode of the radio timepiece 100 mainly includes three modes: a normal time display mode, a chronograph mode, and a radio wave reception mode.
The selection of each mode is selected by operating the switching operation member 170 and the A button 181 and B button 182, and the radio wave reception mode is automatically started at a set time, for example, twice a day. It may be set as follows.

First, the operation in the normal time display mode will be described.
An oscillation signal output when a voltage is applied to the time measuring crystal resonator 281 is divided by the frequency dividing circuit of the control IC 284 to generate a reference signal.
Based on this reference signal, the current time is measured by a time measuring circuit on the control IC 284, and a drive pulse is applied from the control IC 284 to the hour / minute hand drive motor 230 and the second hand drive motor 240 in accordance with the current time measurement. .
Then, the hour / minute hand drive motor 230 and the second hand drive motor 240 are driven, and the rotors 233 and 243 are rotated.
The rotations of the rotors 233 and 243 are transmitted by the gear trains 271 and 272, and the hour hand 132, the minute hand 133, and the second hand 142 are driven to rotate to display the current time.
At this time, the reception antenna 300 does not receive radio waves, and the CG minute hand drive motor 260 and the CG second hand drive motor 250 are also stopped.

Next, the operation in the chronograph mode will be described.
In the chronograph mode, the current time display in the normal time display mode is continued, that is, the driving of the hour / minute hand drive motor 230 and the second hand drive motor 240 is continued.
In the chronograph mode, an elapsed time from an arbitrary time is further displayed as a stopwatch by the CG second display unit 150 and the CG minute display unit 160.
When, for example, the A button 181 is depressed while the chronograph mode is selected by the operation of the switching operation member 170, the elapsed time is measured by the timing unit of the control IC 284.
A drive pulse corresponding to the measurement of the elapsed time is applied from the control IC 284 to the CG second hand drive motor 250 and the CG minute hand drive motor 260, and the CG second hand drive motor 250 and the CG minute hand drive motor 260 are driven.
The rotations of the rotors of the CG second hand drive motor 250 and the CG minute hand drive motor 260 are transmitted to the CG second hand 152 and the CG minute hand 162 via the train wheel, and the elapsed time is displayed by the hands.
At this time, the reception antenna 300 does not receive radio waves.

Next, the operation in the radio wave reception mode will be described.
The radio wave reception mode may be automatically started when a preset radio wave reception time is reached, or may be forcibly executed by the operation of the switching operation member 170, the A button 181 and the B button 182. Good.
In the radio wave reception mode, first, the display of the normal time that has been executed in the normal time display mode is stopped.
That is, the driving of the hour / minute hand drive motor 230 and the second hand drive motor 240 is stopped.
Then, again, a driving pulse for driving the second hand 142 is applied to the second hand drive motor 240 as an indicator of the reception state.

When the standard radio wave is received by the receiving antenna 300, the current time measured on the control IC 284 is corrected based on the time information of the standard radio wave.
When the reception of the standard radio wave is completed, a fast-forward pulse is applied to the hour / minute hand drive motor 230 and the second hand drive motor 240 until the corrected current time is displayed.
The radio wave reception mode is terminated when the current time is displayed by the hour hand 132, the minute hand 133, and the second hand 142.
Thereafter, the normal time display mode is continued.

Here, an operation during reception of the standard radio wave by the receiving antenna 300 will be described.
When the standard radio wave is received by the reception antenna 300, the standard radio wave is linked to the reception coil 320 of the reception antenna 300.
Then, an induction magnetic field is generated from the receiving antenna 300.
This magnetic field exits from one end of the antenna core 310 and returns to the other end of the antenna core 310.
This magnetic field passes through the hour / minute hand drive motor 230 and the CG minute hand drive motor 260 in which driving is stopped.
Since the motor coils 231 and 261 of the hour / minute hand driving motor 230 and the CG minute hand driving motor 260 are arranged orthogonal to the magnetic field, when the magnetic field passes through the hour / minute hand driving motor 230 and the CG minute hand driving motor 260, the magnetic field is The motor coils 231 and 261 are not linked.
Therefore, an induction current and an induction magnetic field are not generated or reduced in the motor coils 231 and 261 of the hour / minute hand driving motor 230 and the CG minute hand driving motor 260.
Therefore, a magnetic field is generated from each motor coil 231, 261 and does not affect the receiving antenna 300, so that the receiving performance of the receiving antenna 300 is kept high.
Further, since no induction magnetic field is generated from the motor coils 231 and 261, the induction magnetic field from the motor coils 231 and 261 does not act on the rotors 233 and 263, and the static stability of the rotors 233 and 263 is maintained.

  Further, since the magnetic pole directions of the rotors 233 and 263 of the hour / minute hand driving motor 230 and the CG minute hand driving motor 260 are parallel to the magnetic field generated from the receiving coil 320 that is receiving the standard radio wave, the rotors 233 and 263 include The force for rotating the rotor does not act, and the rotors 233 and 263 remain stationary while maintaining static stability.

While the standard radio wave is being received by the receiving antenna 300, the control IC 284 detects the reception intensity in units of one second, and displays this reception intensity with the second hand.
At this time, a drive pulse for displaying the received intensity is output from the control IC 284 to the second hand drive motor 240.
An induction magnetic field is induced in the motor coil 241 by the drive pulse, and the rotor 243 is rotationally driven by the induction magnetic field.
The rotation of the rotor 243 is transmitted to the second hand 142 by the train wheel 272 and the received intensity is displayed.

  Here, when a drive pulse is applied to the second hand drive motor 240, an induction magnetic field is generated from the motor coil 241. This induction magnetic field is generated by the trains 272 and 271, the stator 262 of the CG minute hand drive motor 260, and the switching operation member 170. The battery 210 and the train wheel 273 are sequentially returned to the other end of the motor coil 241 and do not reach the receiving antenna 300.

According to such 1st Embodiment, there exists the following effect.
(1) Since the second hand drive motor 240 is arranged at a position far from the receiving antenna 300, it is assumed that a magnetic field is generated by driving the second hand drive motor 240 while the receiving antenna 300 is receiving radio waves. However, this magnetic field can be hardly interlinked with the receiving antenna 300.
Therefore, the receiving performance of the receiving antenna 300 can be kept high without being greatly affected by the presence of the second hand drive motor 240.

(2) While the second hand drive motor 240 that has an adverse effect on reception is separated from the receiving antenna, the motor that stops driving during reception and does not exert the influence of the magnetic field on the receiving antenna 300 (hour / minute hand driving motor 230, CG minute hand driving motor 260 ) Can be arranged at a position close to the receiving antenna 300.
As a result, for example, the hour / minute hand driving motor 230 and the CG minute hand driving motor 260 can be disposed between the second hand driving motor 240 and the receiving antenna 300, and the receiving performance of the receiving antenna 300 can be provided even with a plurality of electromagnetic motors. The overall size can be reduced while maintaining high performance.

(3) When viewed along the magnetic field generated from the receiving antenna 300, the stators 232 and 262 of the hour / minute hand driving motor 230 and the CG minute hand driving motor 260 are end portions of the receiving antenna 300 with the motor coils 231 and 261 therebetween. The stators 232 and 262 are arranged at positions far from the end of the receiving antenna 300 with the motor coils 231 and 261 therebetween.
If the stators 232 and 262, which are highly permeable members, are close to the end of the receiving antenna 300, the standard radio wave is attracted to the stators 232 and 262 rather than the receiving antenna 300, and the interlinkage magnetic flux of the receiving antenna 300 is increased. However, by separating the stators 232 and 262 from the end of the receiving antenna 300, the interlinkage magnetic flux of the receiving antenna 300 can be increased and the receiving performance of the receiving antenna 300 can be maintained high.

(4) Since the hour / minute hand driving motor 230 and the CG minute hand driving motor 260 disposed closer to the receiving antenna 300 than the second hand driving motor 240 are stopped during radio wave reception, the hour / minute hand driving motor 230 and the CG minute hand driving are stopped. The motor 260 does not generate a magnetic field during reception of radio waves.
Therefore, the reception performance of the reception antenna 300 can be kept high.

(5) While the receiving antenna 300 is receiving radio waves, a magnetic field is generated from the receiving antenna 300. The magnetic fields generated from the receiving antenna 300 are motor coils 231 and 261 of the hour / minute hand driving motor 230 and the CG minute hand driving motor 260. For example, the magnetic fluxes linked to the motor coils 231 and 261 are reduced as much as possible.
Since the magnetic field generated from the receiving antenna 300 is difficult to interlink with the motor coils 231 and 261, no extra force acts on the rotors 233 and 263 in the static stable state, and the positions of the rotors 233 and 263 are changed. Can keep.

(6) Since the magnetic pole directions of the rotors 233 and 263 are parallel to the magnetic field from the receiving antenna 300, the direction of the rotors 233 and 263 does not change even when the magnetic field is affected. When the drive motor 230 and the CG minute hand drive motor 260 are driven, the operations of the rotors 233 and 263 can be accurately controlled.

(7) Since the time-measurement crystal resonator 281 is always driven, there is a possibility that noise may be generated while the reception antenna 300 is receiving radio waves. Therefore, it is possible to reduce the influence of noise from the time-measurement crystal resonator 281 on the receiving antenna, and to keep the receiving performance of the receiving antenna 300 high.

(8) The second hand drive motor 240 is driven even during reception of radio waves by the receiving antenna 300 and generates a magnetic field from the motor coil 241, but the formation of the magnetic circuit is assisted by the components around the second hand drive motor 240, The magnetic field emitted from one end of the motor coil 241 returns to the other end of the motor coil 241 before reaching the receiving antenna 300.
Therefore, the receiving antenna 300 is not significantly affected by the magnetic field from the second hand drive motor 240, and the receiving performance of the receiving antenna 300 is maintained high.

(9) The motor coils 231 and 261 are disposed between the reception antenna 300 and the stators 232 and 262, that is, the stators 232 and 262 are separated from the end of the reception antenna 300. Reception of radio waves transmitted from the outside is performed by interlinkage magnetic flux that converges magnetic flux from the outside to the end of the receiving antenna. However, high permeability members such as the stators 232 and 262 are close to the receiving antenna. If this is the case, the magnetic flux from the outside is converged not only on the receiving antenna but also on the stator, and the interlinkage magnetic flux of the receiving antenna is reduced. By separating the stator from the end of the receiving antenna, the interlinkage magnetic flux of the receiving antenna can be increased, and the receiving performance of the receiving antenna can be maintained high.
Therefore, it is possible to drive the pointer during radio wave reception while maintaining the reception performance of the reception antenna high. For example, the reception intensity can be displayed to notify the user of the radio wave reception state.
(Second Embodiment)

Next, a second embodiment of the present invention will be described.
FIG. 3 is a front view of the second embodiment.
FIG. 4 is a diagram with the back cover of the second embodiment removed.
FIG. 5 is a cross-sectional view of the second embodiment.

  This radio-controlled timepiece 400 is arranged so that the receiving antenna 300 and the plurality of electromagnetic motors 610 to 640 are housed in a short cylindrical main body case 110 and the cylindrical hole of the main body case 110 is closed slightly on the front side of the main body case 110. The dial plate 191, the photoelectric conversion panel 192 disposed on the back surface of the dial plate 191, the back cover 193 disposed on the back surface side of the main body case 110 and closing the cylindrical hole of the main body case 110, the receiving antenna 300, And a plurality of motors 610 to 640 (see FIGS. 4 and 5).

The main body case 110 is formed of a metallic member, for example, SUS (stainless steel), brass, titanium, or the like. The dial 191 is a light transmissive member and is formed of a non-magnetic and non-conductive member, for example, glass.
The substrate of the photoelectric conversion panel (solar power generation panel) 192 is nonmagnetic and nonconductive, and is made of, for example, polyimide.
The back cover 193 is a metallic member and is formed of SUS, brass, titanium, or the like.

  In FIG. 3, a display unit 500 includes an hour / minute / second display unit 510 that displays the hour / minute / second of the normal time, a CG hour / minute display unit 520 that is arranged at the 3 o'clock position and displays the chronograph hour / minute, and a 9 o'clock position. And a CG minimum digit display unit 530 for displaying chronograph 1/10 second.

The hour / minute / second display unit 510 includes a scale 511 provided around the great circle, an hour hand 512, a minute hand and 513, and a second hand 514.
The CG hour / minute display unit 520 includes a scale 521 provided around the small circle, a CG hour hand 522, and a CG minute hand 523.
The CG minimum digit display unit 530 includes a scale 531 provided around the small circle and a CG second hand 532.

  The second hand 514 stops displaying the normal second time during reception of the standard radio wave, and functions as a reception status indicator.

In FIG. 4, the battery 210, four motors 610 to 640 as a drive unit, a train wheel 270, and a receiving antenna 300 are basically the same as those in the first embodiment.
The circuit block is omitted.
Here, the motor includes an hour / minute hand driving motor 610 for driving the hour / minute hands 512 and 513 of the hour / minute / second display unit 510, a second hand driving motor 620 for driving the second hand 514 of the hour / minute / second display unit 510, and CG hour / minute. A CG hour / minute hand drive motor 630 for driving the CG hour hand 522 and CG minute hand 523 of the display unit 520 and a CG second hand drive motor 640 for driving the CG second hand 532 of the CG minimum digit display unit 530 are provided.

Here, the CG hour / minute hand driving motor 630 and the CG second hand driving motor 640 are motors that are driven only when the switching operation member 170 is set to a predetermined operation mode (CG mode). This is a small drive motor whose drive is stopped while radio waves are being received.
The hour / minute hand drive motor 610 normally drives the minute hand 513 and the hour hand 512 by driving one pulse every 10 seconds, while the standard radio wave is being received by the receiving antenna 300, the driving cycle is lengthened. This is a small drive motor that drives once every 60 seconds.
The second hand drive motor 620 normally drives the second hand 514 by driving one pulse per second, and drives the second hand 514 by driving one pulse per second even while the standard radio wave is received by the receiving antenna 300. This is a multi-drive motor that displays the reception state.

The layout of each component in the second embodiment will be described.
The receiving antenna 300 is arranged close to the outer periphery of the ground plane at 12:00.
The direction of the receiving antenna 300 is parallel to the direction from 3 o'clock to 9 o'clock.
The CG hour / minute hand drive motor 630 is arranged between 10 o'clock and 11 o'clock, and the CG second hand drive motor 640 is arranged between 1 o'clock and 2 o'clock.
Note that the CG hour / minute hand drive motor 630 and the CG second hand drive motor 640 are arranged on the inner side (center side) of the receiving antenna 300.
The motor coil 631 of the CG hour / minute hand drive motor 630 and the motor coil 641 of the CG second hand drive motor 640 are arranged in a direction that intersects the magnetic field generated from the receiving antenna 300 in the range of 60 degrees to 120 degrees.
The hour / minute hand drive motor 610 is disposed close to the outer periphery of the main plate in the 8 o'clock direction.
The second hand drive motor 620 is disposed close to the outer periphery of the main plate in the 6 o'clock direction.
The direction of the motor coil 641 of the second hand drive motor 620 is parallel to the direction from 3 o'clock to 9 o'clock.

That is, the second hand drive motor 620 that is a multi-drive motor is disposed at a position far from the receiving antenna 300, and the second hand drive motor 620 is smaller than the CG hour / minute hand drive motor 630 and the CG second hand drive motor 640 that are small drive motors. It is arranged at a position far from the receiving antenna 300.
Furthermore, although the hour / minute hand drive motor 610 is also a small drive motor, it is a motor that continues to drive while the reception antenna 300 is receiving the standard radio wave, and therefore stops driving during reception of the standard radio wave. The CG hour / minute hand drive motor 630 and the CG second hand drive motor 640 are arranged farther from the receiving antenna 300.

Next, the receiving antenna 300 and the coils of the motors 610 to 640 will be described.
Since it is better for the receiving antenna 300 to increase the flux linkage in order to receive the standard radio wave, it is preferable that the number of turns of the coil is large.
In addition, since the second hand drive motor 620 is a motor that is always driven during normal time and reception of radio waves, it is preferable that the number of windings is large in order to increase energy efficiency.
However, if the number of turns of the coil is simply increased, the winding becomes thicker and the thickness of the radio timepiece is increased.
Therefore, the coil having a larger number of turns is made larger in length and width, and the thickness is reduced while increasing the number of turns.

  Here, it is assumed that the length of the receiving coil 320 is A, the length of the motor coil 621 of the second hand drive motor 620 is a1, the length of the motor coil 611 of the hour / minute hand drive motor 610 is a2, and the CG hour / minute hand drive motor 630. The length of the motor coil 631 is a3, and the length of the motor coil 641 of the CG second hand drive motor 640 is a4. At this time, the following equation is satisfied.

  A> a1> a2> a3 ≧ a4

  Similarly, regarding the coil width, the width of the receiving coil 320 is B, the width of the motor coil 621 of the second hand drive motor 620 is b1, the width of the motor coil 611 of the hour / minute hand drive motor 610 is b2, and CG The width of the motor coil 631 of the minute hand drive motor 630 is b3, and the width of the motor coil 641 of the CG second hand drive motor 640 is b4. At this time, the following equation is satisfied.

  B> b1> b2> b3 ≧ b4

In addition, the relational expression is naturally established from the length of the coil with respect to the entire length of the receiving antenna 300 and the motors 610 to 640 (that is, the length of the stator).
That is, the length of the antenna core 310 of the receiving antenna 300 is D, the length of the stator 622 of the second hand drive motor 620 is d1, the length of the stator 612 of the hour / minute hand drive motor 610 is d2, and the CG hour / minute hand drive motor. The length of the stator 632 of 630 is d3, and the length of the stator 642 of the CG second hand drive motor 640 is d4. At this time, the following equation holds.

  D> d1> d2> d3 ≧ d4

Next, a cross-sectional (height direction) layout of the receiving antenna 300 and the motors 610 to 640 will be described with reference to FIG.
In FIG. 5, the receiving antenna 300 is disposed on the dial 191 side.
On the other hand, the motors 610 to 640 are disposed on the back cover 193 side, and in particular, the second hand drive motor 620 is disposed closest to the back cover 193.
That is, the receiving antenna 300 is disposed at a position far from the metallic back cover 193 in order to receive standard radio waves. The hour / minute hand driving motor 610 is disposed at a position closer to the receiving antenna 300 than the second hand driving motor 620, and the CG hour / minute driving motor 630 and the CG second hand driving motor 640 are further closer to the receiving antenna 300, but from the receiving antenna 300. Is disposed on the back cover 192 side.
The receiving antenna 300 is close to the non-magnetic, non-conductive dial plate and the photoelectric conversion panel 192. However, the standard radio wave is not shielded by the dial plate 191 and the photoelectric conversion panel 192. Received.
In addition, the second hand drive motor 620 is disposed at a position far from the receiving antenna 300 in plan view (see FIG. 4), but is further disposed at a position farthest from the receiving antenna 300 in a sectional view.

In such a configuration, the basic operation of the second embodiment is the same as that of the first embodiment, and is therefore omitted.

  According to such 2nd Embodiment, in addition to the effect of the said embodiment, there exist the following effects.

(10) Since the receiving antenna 300 and the second hand drive motor 620 are arranged along the outer periphery of the ground plate 285 on the opposite side with the center of the ground plate 285 in plan view, the receiving antenna 300 and the second hand drive motor 620 are disposed. Can be arranged at the farthest position.
As a result, the magnetic field generated from the second hand drive motor 620 is hardly interlinked with the reception antenna 300, and the reception performance of the reception antenna 300 can be kept high without being greatly affected by the presence of the second hand drive motor 620.

(11) Since the length of the motor coil 621 of the second hand drive motor 620 is increased to increase the number of turns, the resistance value of the coil increases.
Then, the second hand drive motor 620 can be driven by a minute drive pulse.
Since the second hand drive motor 620 is constantly driven even during reception of radio waves, it always consumes energy. However, the second hand drive motor 620 can be driven by minute pulses by increasing the length of the motor coil and increasing the number of turns. This can reduce energy consumption as much as possible.

(12) Since the lengths of the motor coils 631 and 641 of the CG hour / minute hand drive motor 630 and CG second hand drive motor 640 are shortened, the magnetic field generated from the CG hour / minute hand drive motor 630 and CG second hand drive motor 640 is reduced, The influence of the magnetic field on the receiving antenna 300 can be reduced.

(13) Since the receiving antenna 300 is arranged on the dial 191 side and the motors 610 to 640 are arranged on the back cover 193 side, the receiving antenna 300 and the motors 610 to 640 are separated from each other also in the cross-sectional direction. The distance between the motor 300 and the motors 610 to 640 can be increased.
The receiving antenna 300 can be kept at a high radio wave receiving performance by being separated from the metallic member.

(14) Since the hour / minute hand driving motor 610 is driven with a driving cycle longer than the normal driving cycle while receiving the radio wave by the receiving antenna 300, the magnetic field generated by the hour / minute hand driving motor 610 is used. The possibility of occurrence of reception errors can be reduced accordingly. Further, the time can be notified to the user by driving the hour hand 512 and the minute hand 513 by the hour / minute hand driving motor 610 without completely stopping the driving of the hour / minute hand driving motor 610 even during reception of radio waves.
(Third embodiment)

Next, a third embodiment of the present invention will be described.
FIG. 6 is a front view of the third embodiment.
FIG. 7 is a view showing a state in which the back cover of the third embodiment is removed.

In FIG. 6, a time display unit 700 and a mode display unit 750 are provided.
The time display unit 700 includes a dial 710, an hour hand 720, a minute hand 730, and a second hand 740.
Here, the hour hand 720, the minute hand 730, and the second hand 740 display CG for displaying the elapsed time from an arbitrary time as a stopwatch in the chronograph mode, in addition to displaying the hour, minute, and second at the normal time. It also functions as an hour hand, CG minute hand, and CG second hand.

The mode display unit 750 displays the currently set mode.
The display method is not particularly limited. For example, digital display may be used, or a part of the rotating mode display plate may be visible from a predetermined window.
Examples of modes that can be set include current time display mode, chronograph mode, zero alignment, timer mode, radio wave reception mode, and the like.
These modes can be selected by the user by rotating the mode switching wheel 751 by operating the switching operation member 170.
Also, as an example of operation, in the state of zero alignment, the second hand can be corrected independently by depressing the A button 181, the minute hand can be independently corrected by depressing the B button 182, and the hour hand is independently decompressed by depressing the C button 183. As an example, it is possible to make corrections in the above.

In FIG. 7, the battery 210, the receiving antenna 300, and a plurality of electromagnetic motors are provided as in the first embodiment.
As the motor, an hour hand driving motor 810 for driving the hour hand 720, a minute hand driving motor 820 for driving the minute hand 730, and a second hand driving motor 830 for driving the second hand 740 are provided.
The hour hand drive motor 810, the minute hand drive motor 820, and the second hand drive motor 830 are driven to display the normal current time by the hands 720 to 740 in the current time display mode, and as a stopwatch in the chronograph mode. It is driven to display the elapsed time with each of the hands 720-740.
Further, the motors 810 to 830 continue to drive while receiving the standard radio wave at the receiving antenna 300 in the radio wave reception mode, and drive to display the normal time with the hands 720 to 740. continue.
However, the minute hand drive motor 820 normally drives the minute hand 513 and the hour hand 512 by driving one pulse every 10 seconds. However, while the standard radio wave is being received by the receiving antenna 300, the driving cycle is increased. Drive once per second.

Here, the hour hand driving motor 810 continues to be driven even during reception of the standard radio wave, but the driving of the hour hand 720 is a small driving motor because the driving cycle is long.
The minute hand drive motor 820 is a small drive motor that continues to be driven during reception of the standard radio wave, but extends the drive cycle during reception of the radio wave.
Since the hour hand drive motor 810 has a longer drive cycle than the minute hand drive motor, the minute hand drive motor 820 is the first small drive motor and the hour hand drive motor 810 is the second small drive motor.
The second hand drive motor 830 is a motor with a short drive cycle and a multi-drive motor.

The layout of each component in the third embodiment will be described.
The receiving antenna 300 is arranged close to the outer periphery of the main plate 285 at 12:00.
The direction of the receiving antenna 300 is parallel to the direction from 3 o'clock to 9 o'clock.
The hour hand drive motor 810 is disposed inside the receiving antenna 300 in the 1 o'clock direction.
The minute hand drive motor 820 is disposed close to the outer periphery of the main plate 285 in the 8:00 direction.
A second hand drive motor 830 is disposed close to the outer periphery of the main plate 285 in the 6 o'clock direction.

  That is, the hour hand drive motor 810 having the long drive cycle is disposed closest to the receiving antenna 300, the second hand drive motor 830 having the shortest drive cycle is disposed at the farthest position from the reception antenna 300, and the minute hand drive motor 820 is It is disposed between the receiving antenna 300 and the second hand drive motor 830.

  The time-measurement crystal resonator 281 is arranged closer to the outer periphery of the main plate than the second hand drive motor 830 in the 6 o'clock direction. The quartz vibrator 281 is shorter than the second hand drive motor 830 for convenience of being disposed in the gap between the second hand drive motor 830 and the main plate 285.

According to such 3rd Embodiment, in addition to the effect of the said embodiment, there exist the following effects.
(15) The hour hand drive motor 810 continues to be driven during normal driving even while the reception antenna 300 is receiving radio waves, so that it is necessary without completely stopping display of information during radio wave reception. Information can be displayed on the display unit.
The hour hand drive motor 810 is a motor for driving the hour hand 720, and since the drive cycle is long, the number of times that the magnetic field is generated is small. Even if the hour hand drive motor 810 is disposed near the reception antenna 300, the reception antenna 300 is provided. The impact on the reception of radio waves in the Internet is small.

(16) The minute hand drive motor 820 is disposed farther from the receiving antenna 300 than the hour hand drive motor 810.
A motor having a short drive cycle and a high frequency of magnetic field generation (minute hand drive motor 820) is arranged at a position far from the receiving antenna 300. That is, among a small number of drive motors, a motor with a high frequency of drive and a high frequency of magnetic field generation ( The minute hand drive motor 820) is arranged at a position far from the receiving antenna 300.
As a result, the reception performance of the reception antenna 300 can be maintained high by reducing the influence of the magnetic field on the reception antenna 300.

The present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, the radio wave received by the receiving antenna is not limited to the standard radio wave, and may be various wireless information.
Of course, the drive pattern of the plurality of electromagnetic motors is not limited to the above-described embodiment. The drive patterns of a plurality of electromagnetic motors for displaying chronograph hours, chronograph minutes, and chronograph seconds in addition to the normal hour, minute, and second display may be set as appropriate.
In the above embodiment, the positional relationship between the watch band and the receiving antenna has not been described, but the watch band is formed to include a conductive material such as SUS (stainless steel), titanium alloy, gold alloy, or brass. In this case, it is desirable that the receiving antenna 300 and the watch band are arranged in a positional relationship that does not overlap in the time viewing direction. That is, when viewed from the time viewing direction, the watch band passes through the approximate center of the watch body and the longitudinal direction is provided substantially parallel to the axis of the antenna coil, and the width of the watch band does not overlap the antenna 300. It is preferable to be formed. In such a configuration, if the wristwatch band is made of a conductive material, the standard radio wave is attracted to the watchband, but the watchband and the antenna 300 do not overlap with each other. The influence on the magnetic flux can be reduced.

  In the above embodiment, the multi-drive motor and the small drive motor are classified according to the number of times of driving. However, a motor driven with a large drive power is replaced with a multi-drive motor, and the motor is driven with a small drive power or receiving radio waves. Even if the motor to be stopped is replaced with a small drive motor, the same effect as that of the above embodiment can be obtained.

  INDUSTRIAL APPLICABILITY The present invention can be used for a radio timepiece (a radio wave correction timepiece) that receives standard radio waves and an electronic timepiece that receives various radio waves.

1 is a front view of a radio timepiece in the first embodiment. The figure which removed the back cover of the radio timepiece in 1st Embodiment. The front view of 2nd Embodiment. The figure which removed the back cover of 2nd Embodiment. Sectional drawing of 2nd Embodiment. The front view of 3rd Embodiment. The figure which removed the back cover of 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Radio wave clock, 110 ... Main body case, 120 ... Display part, 130 ... Hour and minute display part, 131 ... Scale, 132 ... Hour hand, 133 ... Minute hand, 140 ... Second display part, 141 ... Scale, 142 ... Second hand, 143 ... 30 second position, 144 ... 60 second position, 150 ... CG second display portion, 151 ... scale, 152 ... CG second hand, 160 ... CG minute display portion, 161 ... scale, 162 ... CG minute hand, 170 ... switching operation member, 171 ... Winding stem, 172 ... switching unit, 181 ... A button, 182 ... B button, 183 ... C button, 191 ... dial, 192 ... photoelectric conversion panel, 193 ... back cover, 200 ... movement for watch, 210 ... battery, 220 ... driving unit, 230 ... hour / minute hand drive motor, 231 ... motor coil, 232 ... stator, 232A ... bending part, 233 ... rotor, 240 ... second hand drive motor, 241 Motor coil, 242 ... Stator, 243 ... Rotor, 250 ... CG second hand drive motor, 260 ... CG minute hand drive motor, 270 ... Wheel train, 271 ... Train train, 272 ... Train train, 273 ... Train train, 274 ... Train train, 280 ... Circuit block, 281 ... Crystal oscillator for timing, 282 ... Crystal oscillator, 283 ... Crystal oscillator, 284 ... Control IC, 285 ... Ground plate, 300 ... Receiving antenna, 310 ... Antenna core, 320 ... Receiving coil, 400 Reference numeral 500, display section, 510, hour / minute / second display section, 511 ... scale, 512 ... hour hand, 513 ... minute hand, 514 ... second hand, 520 ... CG hour / minute display section, 521 ... scale, 522 ... CG hour hand, 523 ... CG minute hand, 530 ... minimum digit display section, 531 ... scale, 532 ... CG second hand, 610 ... hour / minute hand drive motor, 611 ... motor coil, 620 ... second hand Motor 621 ... Motor coil, 630 ... Hour and minute hand drive motor, 631 ... Motor coil, 640 ... Second hand drive motor, 641 ... Motor coil, 700 ... Time display section, 710 ... Dial, 720 ... Hour hand, 730 ... Minute hand, 740 ... second hand, 750 ... mode display, 751 ... mode switching wheel, 810 ... hour hand drive motor, 820 ... minute hand drive motor, 830 ... second hand drive motor.

Claims (16)

A receiving antenna for receiving radio waves,
A display unit for displaying a plurality of information by a plurality of pointers;
An electronic timepiece having a plurality of electromagnetic motors for driving the plurality of hands,
As the electromagnetic motor,
A multi-drive motor with a relatively large number of driving times during radio wave reception;
A small number of drive motors in which the number of times of driving during radio wave reception is less than that of the multi-drive motor or the drive is stopped, and
The electronic timepiece is characterized in that the multi-drive motor is disposed farther from the receiving antenna than the small drive motor in a plan view and / or a cross-sectional view. A receiving antenna for receiving radio waves,
A display unit for displaying a plurality of information by a plurality of pointers;
An electronic timepiece having a plurality of electromagnetic motors for driving the plurality of hands,
As the electromagnetic motor,
A multi-drive motor with a relatively large number of output pulses during driving during radio wave reception;
A small drive motor in which the number of output pulses at the time of driving during radio wave reception is smaller than that of the multi-drive motor or the number of output pulses is zero, and
The electronic timepiece is characterized in that the multi-drive motor is disposed farther from the receiving antenna than the small drive motor in a plan view and / or a cross-sectional view. A receiving antenna for receiving radio waves,
A display unit for displaying a plurality of information by a plurality of pointers;
An electronic timepiece having a plurality of electromagnetic motors for driving the plurality of hands,
As the electromagnetic motor,
A multi-drive motor driven with relatively large drive power during the radio wave reception;
A small drive motor that is driven with a drive power smaller than the drive power of the multi-drive motor during the radio wave reception or is stopped.
The electronic timepiece is characterized in that the multi-drive motor is disposed farther from the receiving antenna than the small drive motor in a plan view and / or a cross-sectional view. A receiving antenna for receiving radio waves,
A display unit for displaying a plurality of information by a plurality of pointers;
An electronic timepiece having a plurality of electromagnetic motors for driving the plurality of hands,
A long electromagnetic motor having a longer drive motor coil or stator and a short electromagnetic motor having a shorter drive motor coil or stator,
The electronic timepiece characterized in that the long electromagnetic motor is disposed farther from the receiving antenna than the short electromagnetic motor in a plan view and / or a cross-sectional view. The electronic timepiece according to claim 4,
The long electromagnetic motor is a multi-drive motor having a greater number of driving times during radio wave reception,
The electronic timepiece is characterized in that the short electromagnetic motor is a small driving motor in which the number of times of driving during radio wave reception is smaller than that of the multi-driving motor or the driving is stopped. The electronic timepiece according to claim 4,
The long electromagnetic motor is
A multi-drive motor with a large number of output pulses during driving while receiving radio waves,
The short electromagnetic motor is an electronic timepiece characterized in that the number of output pulses during driving during radio wave reception is smaller than that of the multi-drive motor or the number of output pulses is zero. The electronic timepiece according to claim 4,
The long electromagnetic motor is a multi-drive motor driven with a relatively large drive power during the radio wave reception,
The electronic timepiece according to claim 1, wherein the short electromagnetic motor is a small drive motor that is driven or stopped by driving power smaller than that of the multi-drive motor during reception of the radio wave. In the electronic timepiece in any one of Claims 1-3 and 5-7,
The electronic timepiece characterized in that the multi-drive motor drives a pointer that displays a reception state while the reception antenna is receiving the radio wave. In the electronic timepiece according to any one of claims 1 to 3 and 5 to 8,
The small drive motor is driven with a longer driving cycle than the multi-drive motor during normal driving when the radio wave is not received by the receiving antenna,
An electronic timepiece that continues driving during normal driving while receiving the radio wave by the receiving antenna. The electronic timepiece according to claim 9,
A first small drive motor as the small drive motor;
A second small driving motor having a driving cycle longer than that of the small driving motor,
The electronic timepiece characterized in that the first small drive motor is disposed farther from the receiving antenna than the second drive motor. The electronic timepiece according to claim 10,
The multi-drive motor is a second hand drive motor,
The first small drive motor is a minute hand drive motor;
The electronic timepiece characterized in that the second small driving motor is an hour hand driving motor. The electronic timepiece according to claim 10 or 11,
The electronic timepiece is characterized in that the first small driving motor is driven with a driving cycle longer than a normal driving cycle while the radio wave is received by the receiving antenna. The electronic timepiece according to any one of claims 1 to 3, 5 to 8, and 12,
The small drive motor is disposed near the end of the receiving antenna,
The electronic timepiece characterized in that a motor coil of the small drive motor is disposed between a stator of the small drive motor and the receiving antenna. In the electronic timepiece according to any one of claims 1 to 3 and 5 to 13,
The small drive motor is
A motor coil that generates an induced magnetic field;
A stator for transmitting an induced magnetic field from the motor coil;
A rotor that is rotatably arranged in a hole portion of the stator and rotated by an induced magnetic field,
The electronic timepiece is characterized in that the small drive motor is arranged such that the axis of the motor coil of the small drive motor intersects at an angle of 60 degrees to 120 degrees with respect to the axial direction of the coil of the receiving antenna. In the electronic timepiece according to any one of claims 1 to 3 and 5 to 14,
The small drive motor is
A motor coil that generates an induced magnetic field;
A stator for transmitting an induced magnetic field from the motor coil;
A rotor disposed in a hole portion of the stator and rotated by an induced magnetic field,
The rotor is magnetized in two poles;
The electronic timepiece is characterized in that the magnetic pole direction when the rotor is stably stopped is substantially orthogonal or substantially parallel to the direction of the magnetic flux lines flowing into the coil core of the receiving antenna. In the electronic timepiece in any one of Claims 1-3 and 5-15,
An outer case made of metal,
A back cover made of metal,
Comprising a dial made of a non-conductive material,
In the cross-sectional view, the receiving antenna is disposed on the dial side, and the multi-drive motor is disposed on the back cover side.

Images