JP2009236820A - Built-in antenna type electronic clock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a built-in antenna type electronic clock which can enhance antenna characteristics. <P>SOLUTION: A radio wave correcting clock comprises an antenna mounted in an external case, a motor, a drive control circuit which stops the motor when receiving external radio wave information. The axial direction of a motor coil 422 of the motor is mounted nearly in parallel with the axial direction of the antenna. The motor coil 422 is connected to or disconnected from tuning capacitors 47A, 47B which are resonated at an antenna receiving frequency. The drive control circuit stops the motor during receiving the external radio wave information, connects the tuning capacitors 47A, 47B into the motor coil 422, and couples magnetically the antenna with the motor coil 422. The motor coil 422 resonates with the receiving radio wave of the antenna. The magnetic flux density of the external radio wave information near the antenna is enhanced, and then, a magnetic flux quantity passing through the antenna is increased, whereby the antenna characteristics are improved. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an antenna built-in type electronic timepiece represented by a radio-controlled timepiece that receives external wireless information including time information and performs processing such as time correction.

There is known an electronic timepiece with a built-in antenna, such as a radio-controlled timepiece that receives time information from the outside and corrects the time. In such an electronic timepiece with a built-in antenna, it is necessary to arrange an antenna and a motor adjacent to each other in a narrow space like a wristwatch. Various improvements have been proposed so that good antenna characteristics can be obtained even in such a situation.
In Patent Document 1, the motor is stopped at least while valid data of external wireless information (radio waves) is received, so that when the motor coil is arranged in parallel with the antenna, that is, adjacent to the antenna axis orthogonal direction. Even when the motor coil is arranged, it has been proposed to prevent the noise of the motor coil from affecting the effective data of the received signal.

Patent Document 2 describes an auxiliary antenna device that includes an auxiliary antenna that assists an antenna of a radio-controlled timepiece and a resonance circuit that resonates the auxiliary antenna with a built-in antenna of the timepiece. This device has the appearance of a case or a stand for housing the watch. When the watch is placed at night, etc. when the watch is not used, the stand's built-in antenna resonates with the watch's built-in antenna. Reception sensitivity is increased.
Patent Document 3 also describes an auxiliary antenna device that includes an auxiliary antenna that assists the antenna of the radio-controlled timepiece and a resonance circuit. The apparatus of Patent Document 3 further has a plurality of auxiliary antennas so that good reception assisting performance can be obtained regardless of the position of the watch.

JP 2005-99857 A JP 2000-214276 A JP 2007-228026 A

According to Patent Document 1 described above, good antenna characteristics can be obtained while an antenna and a motor are disposed adjacent to each other in a case of an electronic timepiece with a built-in antenna.
However, the antenna that can be installed in a narrow space such as a wristwatch is limited, and there is a problem that it is difficult to further improve the antenna characteristics.

  An object of the present invention is to provide an electronic timepiece with built-in antenna capable of improving antenna characteristics in the electronic timepiece with built-in antenna.

  An electronic timepiece with built-in antenna according to the present invention includes an exterior case, an antenna that is disposed in the exterior case and receives external wireless information, a reception unit that processes external wireless information received by the antenna, and a time display unit. Drive control means for controlling the driving of the receiving means and the time display means, and the antenna comprises a coil wound around a core, and the time display means includes a motor having a motor coil, A display unit driven by a motor, and the motor coil is arranged in parallel with the antenna so that its axial direction is substantially parallel to the axial direction of the antenna. A tuning capacitor that resonates the motor coil at the reception frequency of the antenna is connected to be able to be intermittently connected, and the drive control means receives the external wireless information. With between stops the motor are, and wherein said tuning capacitor thereby magnetically coupling the motor coil and the antenna connected to the motor coil.

In the present invention, the motor is stopped while the external wireless information is received by the drive control means, and the motor coil is connected to the tuning capacitor and is magnetically coupled to the antenna.
Here, the motor coil functions as an element that resonates at the reception frequency of the antenna (frequency of the external wireless information) when connected to the tuning capacitor. That is, when the motor coil is connected to the tuning capacitor, the motor coil resonates with the radio wave of the external wireless information, and forms a sub magnetic path with a magnetic flux of the same reception frequency in the vicinity. Here, the motor coil is installed substantially parallel to the antenna, and the magnetic flux in the secondary magnetic path of the motor coil acts to increase the reception sensitivity of the antenna. As a result, a large amount of magnetic field components (magnetic flux) of radio waves gather near the antenna and the magnetic flux density increases, and the amount of magnetic flux passing through the antenna increases accordingly, so that the antenna characteristics can be improved.

The period during which the motor is stopped and the tuning capacitor is connected is during reception of external wireless information, but at least as long as valid data is received from radio waves of external wireless information. .
Valid data in the external wireless information means a data portion necessary for processing in each clock. For example, in the case of a standard radio wave having time information, for example, JJY, which is a Japanese standard radio wave, will be described. In addition to hour data and minute data, total date data from January 1, calendar data, day of the week data are included. In addition, there are data areas that are included and are not currently used. Therefore, in the case of a clock that displays not only the time but also the date, but does not display the day of the week, the hour, minute, day of the week, and year data are valid data, and the day of the week data is unnecessary. In this way, valid data is set by processing and functions in each clock.
The determination of whether the currently received data is valid data or invalid data is made, for example, when a time code is determined such as a standard radio wave, It may be controlled at the transmission timing, or when the marker indicating the type of each data to be sent next is included in the data, the marker information is referred to and the data to be sent after that is It may be determined whether or not the data is valid in the watch. Furthermore, a part from the head of each data may be received and analyzed, and the type of the data may be determined to determine whether it is valid.

The axial direction of the antenna means a direction orthogonal to the direction having the strongest directivity for radio wave reception in the antenna. For example, in the case of a bar antenna in which the antenna is formed in a straight line, it usually means a direction along the longitudinal direction. In the case of an arc-shaped antenna having a planar curved shape, the axial direction of the antenna usually means the tangential direction of the arc at the center between both ends of the antenna. Further, when the antenna is configured to include a linear intermediate portion and an end portion provided to be inclined with respect to the intermediate portion, a direction along the longitudinal direction of the intermediate portion is usually used. Means.
Therefore, when the motor coil and the antenna are formed in a straight line, for example, the motor coil and the antenna are arranged in parallel so that their axial directions are substantially parallel to each other. It is arranged that the axial directions along the are substantially parallel to each other. Further, when the antenna is curved in a plane arc shape, the antenna is arranged so that the axial direction of the antenna (the tangential direction of the central portion of the antenna) and the axial direction along the longitudinal direction of the motor coil are substantially parallel. Means that

  The antenna axial direction being substantially parallel is not limited to the case where the respective axial directions are parallel, and it is only necessary that the antennas be arranged in a direction that can increase the number of magnetic fluxes interlinking the antennas when the motor coils are arranged in parallel. That is, in order to improve the magnetic flux density in the direction that links the antennas, the direction of the magnetic flux that links the antennas and the direction of the magnetic flux that links the motor coils need to be substantially the same. Therefore, it is most preferable that the crossing angle in the axial direction of the antenna and the motor coil is 0 degree, that is, parallel, but even if the crossing angle in each axial direction is about 30 degrees or less, the magnetic flux density is reduced by the motor coil. The improvement effect is obtained. Therefore, the motor coil only needs to be arranged in a direction that can increase the number of magnetic fluxes interlinking the antenna. For example, the crossing angle in each axial direction is within 30 degrees, preferably within 15 degrees, more preferably within 5 degrees. I just need it. Here, the crossing angle in each axial direction is 0 degrees, for example, in a wristwatch, the axial direction of the antenna and the axial direction of the motor coil are 0 degrees in each of the plane direction and the cross-sectional direction of the timepiece. That is, it means that each axial direction is parallel in three dimensions.

Further, in a normal timepiece, particularly a wristwatch, since the movement is required to be thin, the motor coil and the antenna are arranged so as not to overlap with the cross-sectional direction of the timepiece (the axial direction of the outer case) In the case of a watch with a limited movement thickness, it may be overlapped in the cross-sectional direction.
Furthermore, since the motor coil is only required to be magnetically coupled to the coil of the antenna, the antenna and the motor coil need not be in contact with each other, and may be arranged at a predetermined interval. In short, it suffices if they are arranged adjacent to each other at intervals that can be magnetically coupled during the receiving operation. The interval at which this magnetic coupling is possible varies depending on the antenna length. When the antenna length is increased, the magnetic coupling can be performed even if the interval with the motor coil is increased. Therefore, the distance between the antenna and the motor coil may be set according to the antenna length.
The display unit driven by the motor is not limited to various hands such as an hour hand, minute hand, second hand, chronograph second hand, and includes a date wheel on which a date is printed, and various times ( It may be anything that displays time).

In the present invention, it is preferable that there are a plurality of types of reception frequencies of the antenna and the receiving means, and the tuning capacitor can switch a plurality of capacitors in accordance with the reception frequencies.
The standard radio wave that can be used for time correction uses the long wave band, and its reception frequency is JJY in Japan (40 kHz and 60 kHz), WWVB in the United States (60 kHz), DCF77 in Germany (77.5 kHz), MSF in England (60 kHz) China's BPC (68.5 kHz). Therefore, it is necessary to correspond to different reception frequencies between different countries, and since there are two reception frequencies in Japan, it is necessary to correspond to different reception frequencies in order to cope with both. On the other hand, by switching a plurality of capacitors to be a tuning capacitor, the tuning capacitor can be switched to a different capacitance value, and a plurality of reception frequencies can be handled.
Note that when switching capacitors, a capacitor corresponding to each reception frequency is prepared, and either of them may be selected, or a capacitor having a differential capacitance is added to a capacitor having a basic capacitance. A method of switching the capacitance as a tuning capacitor by connecting or separating may be used.

In the present invention, it is preferable that at least a part of the outer case is made of metal, and the antenna is disposed between the motor coil and an inner peripheral surface of the outer case.
According to such a configuration, since the antenna is arranged inside the outer case and the motor coil is arranged inside the antenna, the antenna and the motor coil do not overlap in the cross-sectional direction of the watch, and the movement, that is, the watch is thin. Can be In addition, since the motor drives a train wheel located on the center side of the outer case, the motor and the train wheel can be disposed close to each other as long as the motor and the train wheel are disposed inside the antenna, so that component placement is facilitated.

In addition, if the inner peripheral surface of the outer case is a circular surface, the antenna is formed in an arc shape and arranged along the inner peripheral surface, a large space on the center side of the outer case can be secured, and the inner space of the case is effective. Can be used. For this reason, the exterior case can be further downsized, and for example, an antenna can be incorporated even in a female wristwatch that is smaller than a male wristwatch.
Furthermore, if the antenna is disposed along the inner peripheral surface of the outer case, that is, if the axial direction of the antenna is substantially along the inner peripheral surface of the case, the end surface of the antenna faces the inner peripheral surface of the outer case. Therefore, even when the exterior case is made of metal, the antenna disposed in the case can be disposed close to the exterior case, and the antenna characteristics can be improved.
In other words, when the exterior case is made of metal, if the end face of a member that links the magnetic flux of the radio wave, such as an antenna or motor coil, is placed close to the inner peripheral surface of the outer case, the radio wave is attenuated by the case. However, the reception sensitivity is degraded by several decibels. For this reason, the end face of the antenna or the like must be placed away from the outer case, but in that case, the antenna length is shortened in the case of an antenna placed in a small outer case like a wristwatch, and the antenna characteristics Will fall.

On the other hand, if the antenna or the like is disposed along the inner peripheral surface of the outer case as in the present invention, the end surface of the core can be separated from the outer case to some extent even if the antenna is disposed close to the inner peripheral surface of the outer case. . Therefore, even when the outer case is made of metal, it is possible to suppress the deterioration of the reception sensitivity of the antenna, to secure the antenna length to some extent, to prevent the deterioration of the antenna characteristics, and to reduce the size of the watch. .
In addition, since the exterior case can be made of metal, a metallic appearance can be obtained and a high-class feeling can be enhanced.
In the present invention, the outer case is not limited to being made entirely of metal, but may be made of metal as long as it is at least part of the outer case. For example, when a metal cover is attached to a plastic case, at least partly, especially if metal is used on the exterior case surface, a high-quality external design built-in antenna electronic watch Can do.

Here, it is preferable that the external wireless information is a standard radio wave, and the drive control unit is configured to control display of the time display unit based on time data included in the standard radio wave.
At this time, the drive control means disconnects the tuning capacitor from the motor coil and removes the motor while receiving data unnecessary for radio wave correction processing among the 60 bits constituting one cycle of the time data. It is preferable to drive.
As described above, standard radio waves that can be used for time correction include, for example, JJY in Japan, WWVB in the United States, DCF77 in Germany, MSF in the United Kingdom, BPC in China, and the like. Other data such as date and day of the week are included. Therefore, the display of the time display means can be properly maintained even with only the data necessary for the correction of the time display means.
For example, in a standard radio wave (JJY) that transmits one time information in one minute, data that is not necessarily required for time correction such as a day of the week is transmitted for 50 to 59 seconds. 49 seconds portion) can be determined as valid data, and data for 50 to 59 seconds can be determined as invalid data. Therefore, by stopping the motor when receiving valid data, correct valid data necessary for time correction can be received, so that time correction can be performed with high accuracy and time display stoppage due to motor stop is minimized. be able to.

In the present invention, the motor coil preferably has a two-layer structure of a motor coil portion and an auxiliary antenna coil portion.
In the present invention as described above, it is possible to appropriately set the function corresponding to each function of the original function as the motor coil and the function of resonating and assisting the antenna reception performance. Thereby, the appropriate coil according to each function is securable, sharing the mechanical space as a motor coil.
Specifically, with respect to the wire diameters of the motor coil part and the auxiliary antenna coil part, the motor coil part uses a wire having a smaller winding diameter than the auxiliary antenna coil part, for example, a wire having a diameter of 20 to 30 μm. It is preferable to use a wire having a larger winding diameter than the motor coil portion, for example, a wire having a diameter of 70 to 100 μm.
By thickening the coil winding, the Q value at the time of resonance can be increased, and the magnetic flux in the secondary magnetic path can be increased. For this reason, it is desirable that the coil diameter for assisting the antenna is large. On the other hand, if the coil winding is thick, the resistance value becomes small and the drive current increases. Therefore, it is desirable for the motor coil to have a small winding diameter. With respect to such requirements, by providing the motor coil portion and the auxiliary antenna coil portion as in the present invention, it is possible to set different winding diameters for each function.

The motor coil portion and the auxiliary antenna coil portion are preferably arranged so that the motor coil portion is an inner layer and the auxiliary antenna coil portion is an outer layer. With such an arrangement, the amount of magnetic flux leakage by the outer auxiliary antenna coil portion at the end of the motor coil increases, the amount of coupling of the sub magnetic path to the antenna increases, and effective antenna characteristics can be improved.
In addition, existing winding materials, such as a uremet wire, can be used for a motor coil part and an auxiliary antenna coil part similarly to the existing antenna. A high magnetic permeability material such as SUY (pure iron), silicon steel, and permalloy can be used for the magnetic core, as with the antenna.

In the present invention, while the external wireless information is being received, it is preferable that both ends of the motor coil are connected to each other to be in a short state.
In the present invention as described above, when the motor is stopped, the both ends of the motor coil unit are connected to each other to make a short state, so that no voltage is induced in the motor coil unit, and the auxiliary antenna being received Unnecessary influence on the coil portion can be avoided.

  As described above, according to the electronic timepiece with built-in antenna of the present invention, in the electronic timepiece with built-in antenna, there is an effect that the antenna characteristics can be improved by using an existing component called a motor coil.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted or simplified.
[First Embodiment]
1 to 10 show a first embodiment of the present invention.
FIG. 1 is a block diagram showing a configuration of a radio wave correction timepiece 1 as an analog built-in type electronic timepiece according to the first embodiment of the present invention.
A radio wave correction timepiece 1 of the present invention has a configuration similar to that of a general radio wave correction timepiece, and includes a receiving means 2 as communication means for receiving radio waves (external wireless information) including time information, and a drive control means. Drive control circuit unit 3, drive unit 4 for driving the hands, counter unit 6 for counting time, power supply unit 7 for supplying power, and external input device 8 such as a crown. ing.

The receiving means 2 includes an antenna 21 that receives radio waves, an antenna tuning circuit unit 22 that is configured by a capacitor or the like and tunes to radio waves received by the antenna 21, a receiving circuit 23 that processes information received by the antenna 21, and a receiving circuit And a time data storage circuit unit 24 for storing the time data processed in 23.
As shown in FIG. 2, the antenna 21 is configured by winding a coil 212 around a magnetic core 211, and is insulated by cationic electrodeposition coating having excellent corrosion resistance, if necessary.

The magnetic core 211 is formed by, for example, punching a cobalt-based amorphous foil (for example, amorphous foil of Co 50 wt% or more) with a mold or bonding approximately 10 to 30 formed by etching, and superimposing, annealing, etc. To stabilize the magnetic characteristics. That is, the magnetic core 211 is configured by laminating a plane rectangular amorphous foil in the plane direction of the timepiece and further curving it. The magnetic core is not limited to the laminated amorphous foil, and ferrite may be used. In this case, the magnetic core may be formed by a mold or the like and heat-treated.
Here, since each amorphous foil of the magnetic core 211 has a thickness dimension of about 0.01 mm to 0.05 mm, for example, when 30 sheets are stacked, the thickness dimension of the magnetic core 211 in the stacking direction is 0.00. It is about 3 to 1.5 mm. Since the amorphous material has better magnetic characteristics than ferrite, a smaller and thinner antenna 21 can be realized. Since antenna characteristics are affected by the volume of the core, the antenna area must be increased or the antenna length (core length) must be increased in order to maintain the antenna characteristics by making the antenna thinner. There is. Therefore, in this embodiment, the width dimension of the magnetic core 211 is, for example, about 0.5 to 3.5 mm, and the length is about 15 to 30 mm. If the thickness of the amorphous metal plate is greater than 0.05 mm, it is difficult to quickly cool the central portion of the plate thickness, so that the metal is crystallized without being amorphized. That is, in order to produce an amorphous metal, it is necessary to perform a rapid cooling operation before the metal is crystallized. For this purpose, the thickness of the metal must be reduced. In addition, when the thickness of the amorphous metal plate is less than 0.01 mm, the strength of the amorphous metal plate is weakened and easily deformed during assembly work, etc., so that it is very difficult to position the parts and handle the parts. .

The coil 212 requires an inductance value of about 10 to 50 mH when receiving a long wave standard radio wave (40 to 77.5 kHz). For this reason, in this embodiment, the coil 212 is formed by winding a uremet wire having a diameter of about 0.1 μm for several hundred turns.
The length of the coil 212 (antenna length as the antenna 21) is set to a length capable of receiving a long-wave standard radio wave (40 to 77.5 KHz), specifically, about 14 to 15 mm or more. Is set.

In the present embodiment, the coil 212 is not wound up to the end surface 211B of the core 211 to facilitate the winding operation of the coil 212 and to prevent the end portion from being unwound. Is wound to a position several millimeters apart. Accordingly, the end portion 211A of the core 211 has a portion where the coil 212 is not wound.
Further, the winding method of the coil 212 is not particularly limited, and random winding may be used, but aligned winding is particularly preferable. If the aligned winding is employed, there is no useless space between the coil wires, and the coil volume for obtaining the same inductance value can be reduced. In this embodiment, since the core 211 has a planar arc shape, the antenna 21 is manufactured as follows. First, after winding a coil 212 of a self-bonding electric wire around a bobbin, the coil 212 is hardened by dipping in heat or a solution. After the coil 212 is hardened, the bobbin is pulled out, and the magnetic core 211 is inserted into a through-hole portion of the coil 212 formed by pulling out the bobbin, thereby completing the antenna 21. The antenna may be configured by inserting a core into a bobbin wound with a coil. In this case, the size is increased by the presence of the bobbin, but the antenna can be easily manufactured.

As shown in FIG. 3, the antenna tuning circuit unit 22 includes two antenna tuning capacitors 22A and 22B connected in parallel to the antenna 21, and one antenna tuning capacitor 22B is connected via a switch 22C. Connected to the antenna 21.
The frequency of the radio wave received by the antenna 21 is switched by turning on or off the switch 22C according to a frequency switching control signal output from the drive control circuit unit 3. As a result, for example, in Japan, two types are output from the standard radio wave output station of Otakado and Mt. (East Japan) with a transmission frequency of 40 kHz and the standard radio wave output station of Mt. Hagane (West Japan) with a transmission frequency of 60 kHz. It is configured to be able to switch and receive a long wave standard radio wave having a frequency of.

As shown in FIG. 3, the receiving circuit 23 amplifies the long wave standard radio signal received by the antenna 21, and a bandpass filter 232 that extracts only a desired frequency component from the amplified long wave standard radio signal. A demodulation circuit 233 for smoothing and demodulating the long wave standard radio signal, an AGC (Automatic Gain Control) circuit 234 for controlling the gain of the amplification circuit 231 and controlling the reception level of the long wave standard radio signal to be constant, and demodulation And a decoding circuit 235 for decoding and outputting the long wave standard radio wave signal.
The time data received and signal processed by the receiving circuit 23 is output to and stored in the time data storage circuit unit 24 as shown in FIG.
The reception circuit 23 starts reception of time information based on a reception control signal output from the drive control circuit unit 3 by a preset schedule, a forced reception operation by the external input device 8, or the like.

As shown in FIG. 1, the drive control circuit unit 3 receives the pulse signal from the pulse synthesis circuit 31. The pulse synthesizing circuit 31 divides a reference pulse from a reference oscillator 311 such as a crystal oscillator to generate a clock pulse, and generates a pulse signal having a different pulse width and timing from the reference pulse.
The drive control circuit unit 3 outputs a second drive pulse signal PS1 that is output once per second to drive the second hand, and an hour / minute drive pulse signal PS2 that is output once per minute to drive the hour / minute hand. 41, output to the hour / minute driving circuit 42 to control the driving of the hands. That is, each drive circuit 41, 42 drives a second motor 411 and an hour / minute motor 421 including a stepping motor driven by a pulse signal from each circuit 41, 42, and is thereby connected to each motor 411, 421. The second hand, the minute hand and the hour hand are driven. Each pointer, motors 411 and 421, and drive circuits 41 and 42 constitute time display means for displaying the time. In addition, as a time display means, you may drive an hour hand, a minute hand, and a second hand with one motor.

The counter unit 6 includes a second counter circuit unit 61 that counts seconds and an hour / minute counter circuit unit 62 that counts hours and minutes.
The second counter circuit unit 61 includes a second position counter 611, a second time counter 612, and a coincidence detection circuit 613. The second position counter 611 and the second time counter 612 are both 60 counts, that is, a counter that loops in 60 seconds when a 1 Hz signal is input. The second position counter 611 counts the drive pulse signal (second drive pulse signal PS1) supplied from the drive control circuit unit 3 to the second drive circuit 41. That is, the position of the second hand indicated by the second hand is counted by counting the drive pulse signal for driving the second hand.
The second time counter 612 normally counts a 1 Hz reference pulse signal (clock pulse) output from the drive control circuit unit 3. When the time data is received by the receiving means 2, the counter value is corrected according to the second data of the time data.

Similarly, the hour / minute counter circuit unit 62 includes an hour / minute position counter 621, an hour / minute time counter 622, and a coincidence detection circuit 623. Both the hour / minute position counter 621 and the hour / minute time counter 622 are counters that loop when signals for 24 hours are input. The hour / minute position counter 621 counts the drive pulse signal (hour / minute drive pulse signal PS2) supplied from the drive control circuit unit 3 to the hour / minute drive circuit 42, and counts the position of the hour / minute hands indicated by the hour hand and minute hand. is doing.
The hour / minute time counter 622 normally counts a 1 Hz pulse (clock pulse) output from the drive control circuit unit 3 (more precisely, 1 count is counted when 1 Hz is counted 60 times). When the time data is received by the receiving means 2, the counter value is corrected according to the hour / minute data of the time data.

The coincidence detection circuits 613 and 623 detect the coincidence of the count values of the position counters 611 and 621 and the time counters 612 and 622 and output a detection signal indicating whether or not they coincide to the drive control circuit unit 3. To do.
When the mismatch signal is input from the match detection circuits 613 and 623, the drive control circuit unit 3 continues to output the drive pulse signals PS1 and PS2 until the match signal is input. For this reason, during normal hand movement, when the counter values of the time counters 612 and 622 are changed by the reference signal of 1 Hz from the drive control circuit unit 3 and do not coincide with the position counters 611 and 621, the drive pulse signals PS1 and PS2 are As each pointer is output and moved, the position counters 611 and 621 coincide with the time counters 612 and 622. By repeating this operation, normal hand movement control is performed.
When the time counters 612 and 622 are corrected with the received time data, the drive pulse signals PS1 and PS2 are continuously output until the counter values of the position counters 611 and 621 coincide with the counter values. Is fast-forwarded and corrected to the correct time.

The power supply means 7 includes a power generator 71 as a power generator configured by a self-winding generator, a solar battery (solar generator), and the like, and a high-capacity secondary power source 72 that stores power generated by the power generator 71. It is configured with. As the high capacity secondary power source 72, a secondary battery such as a lithium ion battery can be used. As the power supply means 7, a primary battery such as a silver battery may be used.
The external input device 8 as an external input means includes a crown and is used for performing a receiving operation, time adjustment, and the like.

Next, a specific structure of the radio-controlled timepiece 1 will be described.
As shown in FIGS. 4 and 5, the radio-controlled timepiece 1 includes a casing (cylinder) 91 formed in an approximately ring shape, a cover glass 92 attached to the front surface side of the casing 91, and a back surface side of the casing 91. And a back cover 93 detachably attached thereto. The casing 91 is made of a metal material such as stainless steel, brass, or titanium. Therefore, the casing 91 constitutes a metal exterior case (watch case) 9 in the present embodiment. Each component including the antenna 21 is incorporated in the outer case 9.
That is, the circuit board on which the receiving IC 81, the CPU 82, the reference vibrator 311 and the like constituting the drive control circuit unit 3 and the counter unit 6 are mounted, and the motors 411 and 421 and the train wheel 40 constituting the driving unit 4 are incorporated. Each component such as a watch body (movement) 98, a high-capacity secondary power source (secondary battery) 72 constituting the power supply means 7, and a dial plate 95 and a base plate 96 provided on the surface side of the watch body are incorporated. ing.
The antenna 21 is fixed to the ground plane 96 using a thermoplastic resin (hot melt), an ultraviolet curable epoxy, or the like. Moreover, in order to give the function as a buffer material of the antenna 21, it may be fixed using an elastic sealing material.

Here, the antenna 21 and the receiving IC 81 are connected by two wires. That is, the antenna 21 and the receiving IC 81 are electrically connected by taking out the coil 212 from the end of the antenna and soldering it to the circuit board 80. The electrical connection may be performed by attaching a flexible substrate made of polyimide or the like to the antenna 21 and screwing the substrate to the circuit board.
Further, the dial plate 95 can be made of a metal such as brass (brass, Bs), white (white silver, NS), etc., but a non-conductive member (electrical insulator) such as plastic or ceramic. In other words, it is preferably made of a material that allows easy transmission of standard radio waves.
The back cover 93 may be made of a metal material similar to that of the casing 91, but is preferably made of a non-conductive member (electrical insulator) such as plastic or glass, that is, a material that can easily transmit radio waves.
At two opposing portions of the casing 91, usually at the 12 o'clock direction and 6 o'clock direction on the dial plate 95, connecting protrusions (cans) 94 for connecting the watch band are respectively provided. The watch band 97 attached to the casing 91 is configured by connecting a plurality of piece members so as to be rotatable with pins (spring bars or the like). The piece member at the end is also rotatably connected to the casing 91 with a pin.

The antenna 21 is disposed along the circumferential inner surface 91 </ b> A of the casing 91, that is, the outer case 9. That is, as shown in FIG. 4, the planar shape of the magnetic core 211 of the antenna 21 is formed in an arc shape that is substantially concentric with the inner peripheral surface 91 </ b> A, and the coil 212 is wound around the magnetic core 211 to form a substantially circular plane. It is configured in an arc.
The antenna 21 is arranged in the 9 o'clock direction with respect to the center point O of the outer case 9. On the other hand, the high-capacity secondary power source (secondary battery) 72 is arranged at about 4 o'clock with respect to the center point O. Therefore, the antenna 21 and the secondary battery 72 are disposed relatively far apart. The reference vibrator 311 is also arranged in the direction of approximately 3 o'clock, and is arranged farther from the antenna 21 than the receiving IC 81 or the like. As described above, the secondary battery 72 and the reference vibrator 311 are disposed away from the antenna 21 so that the secondary battery 72 and the reference vibrator 311 do not affect the interlinkage magnetic field. That is, since the secondary battery 72 includes a metal case such as stainless steel, the interlinkage magnetic field is affected if the secondary battery 72 is disposed in the vicinity of the antenna 21. On the other hand, as the reference vibrator 311, a 32.768 kHz crystal vibrator is used, and since this vibration frequency is close to the long wave reception frequency (40 kHz), the reference vibrator 311 is disposed close to the antenna 21. There is a possibility that a signal is mixed in the antenna 21 as noise. Therefore, the secondary battery 72 and the reference vibrator 311 are disposed relatively far from the antenna 21.

  When the antenna 21 receives a radio wave such as a long wave standard radio wave, the magnetic field component (see the magnetic flux B1 in FIG. 8), which is a part of the radio wave, causes the core 211 of the antenna 21 to move from one end 211A to the other end. It passes to the part 211A (see FIG. 2). Then, an alternating current is induced in the coil 212 wound around the core 211, and accordingly, an alternating voltage is generated at both ends of the coil 212. Then, the AC voltage flows as an analog reception signal to the reception circuit 23 (see FIG. 3). The analog reception signal is subjected to processing such as amplification, demodulation, and decoding by the reception circuit 23 to obtain digital time data, which is stored in the time data storage circuit unit 24 (see FIG. 1).

Next, specific configurations of the motors 411 and 421 and the drive circuits 41 and 42 will be described. Since the configuration of each of the drive circuits 41 and 42 is basically the same, the drive circuit 41 of the second motor 411 will be described as an example.
The second motor 411 and the hour / minute motor 421 are composed of stepping motors driven by pulse signals. Specifically, as shown in FIG. 4, motor coils 412 and 422 that generate magnetic force by drive pulses supplied from the drive circuits 41 and 42, and stators 413 and 423 excited by the motor coils 412 and 422, , Rotors 414 and 424 that are rotated by a magnetic field excited inside the stators 413 and 423, and cores 415 and 425 that are inserted into the motor coils 412 and 422 and connected to the stators 413 and 423, respectively.
The rotation of the rotor 414 of the second motor 411 is transmitted to the second hand by a wheel train 40A composed of a fifth wheel, a fourth wheel and the like meshed with the rotor 414 through a kana. On the other hand, the rotation of the rotor 424 of the hour / minute motor 421 is transmitted to the minute hand and hour hand by a train wheel 40B including a third wheel, second wheel, date wheel, hour wheel and the like.

As shown in FIG. 6, each of the drive circuits 41 and 42 includes a bridge circuit composed of a p-channel MOS 43A and an n-channel MOS 44A connected in series, and a p-channel MOS 43B and an n-channel MOS 44B connected in series. ing.
The drive circuits 41 and 42 include rotation detection resistors 45A and 45B connected in parallel to the p-channel MOSs 43A and 43B, respectively, and sampling p-channel MOSs 46A for supplying chopper pulses to these resistors 45A and 45B. , 46B. Therefore, by applying a control pulse having a predetermined polarity and pulse width from the drive control circuit unit 3 to each gate electrode of the MOSs 43A, 43B, 44A, 44B, 46A, and 46B at each timing, the polarity is applied to the motor coil 412. Drive pulses different from each other, or a detection pulse for exciting an induced voltage for rotation detection or magnetic field detection of the rotor 414 can be supplied.

The motor coils 422 of the hour / minute motor 421 are arranged inside the antenna 21 so that the axial directions thereof are substantially parallel to each other.
As shown in FIG. 4, the motor coil 422 is adjacent to the direction orthogonal to the axis of the antenna 21, and the axial direction of the motor coil 422 and the axial direction of the antenna 21 are arranged substantially in parallel. Here, the axial direction of the motor coil 422 is the longitudinal direction of the linear core 425. The axial direction of the antenna 21 means a direction orthogonal to the direction in which the antenna 21 has the strongest directivity for radio wave reception. That is, in the case of the arc-shaped antenna 21 having a planar curved shape according to this embodiment, the axial direction of the antenna is a tangential direction of the arc (antenna side surface) at the center (middle point) between both ends of the antenna 21. is there.
Further, as shown in FIG. 5, the height positions of the motors 411 and 421 are arranged at substantially the same position as the height position of the antenna 21. In addition, since the thickness dimension of the motor coils 412 and 422 of the motors 411 and 421 is smaller than the thickness dimension of the antenna coil 212, in the present embodiment, the motors 411 and 421 are arranged so as to fit within the height dimension of the antenna 21. Has been.
Such an arrangement strengthens the magnetic coupling between the antenna 21 and the motor coil 422, which will be described later, and increases the magnetic flux of the sub magnetic path, thereby contributing to the improvement of the reception sensitivity of the antenna 21.

Tuning capacitors 47A and 47B (see FIG. 7) that resonate the motor coil 422 at the reception frequency of the antenna 21 are connected to the motor coil 422 of the hour / minute motor 421 in an intermittent manner.
As shown in FIG. 7, the drive circuit 42 of the motor coil 422 includes a bridge circuit composed of p-channel MOSs 43A and 43B (P1, P2) and n-channel MOSs 44A and 44B (N1, N2). P1 can connect one terminal O1 of the motor coil 422 and the high potential power source Vdd, and P2 can connect the other terminal O2 of the motor coil 422 and the power source Vdd. N1 can connect one terminal O1 of the motor coil 422 and the low potential power source Vss, and N2 can connect the other terminal O2 of the motor coil 422 and the power source Vss. Accordingly, a current flows from the terminal O1 to the terminal O2 in the motor coil 422 when P1 and N2 are conductive, and a current flows from the terminal O2 to the terminal O1 when P2 and N1 are conductive.

A plurality of capacitors 47A and 47B (C1, C2) used as tuning capacitors are connected in parallel between the terminal O2 and the power supply Vdd. P-channel MOSs 48A and 48B (RP1 and RP2) are connected in series to the capacitors 47A and 47B, respectively. The capacitors 47A and 47B are individually connected to the motor coil 422 according to the conduction state of the MOSs 48A and 48B to constitute a resonance circuit.
For example, when the MOS 48A (RP1) is in a conductive state and the MOS 48B (RP2) is in a cut-off state, and the MOS 43A (P1) is in a conductive state and the MOS 43B (P2) is in a cut-off state, the capacitor 47A is connected from the terminal O2 of the motor coil 422. A loop returning to the terminal O1 through (C1), the MOS 48A (RP1), the power source Vdd, and the MOS 43A (P1) is formed.

Further, when the MOS 48A (RP1) is cut off and the MOS 48B (RP2) is turned on, if the MOS 42A (P1) is turned on and the MOS 43B (P2) is cut off, the capacitor 47B is connected from the terminal O2 of the motor coil 422. A loop is formed that returns to the terminal O1 via (C2), the MOS 48B (RP2), the power source Vdd, and the MOS 43A (P1). In these states, the LC resonance circuit corresponding to the capacity and the inductance of the motor coil 422 is configured using the capacitor 47A (C1) or the capacitor 47A (C2) as a tuning capacitor. Further, when both of the MOSs 48A and 48B (RP1 and RP2) are in a conductive state, a resonance circuit is obtained in which the capacitance C1 + C2 of the capacitors 47A and 47B connected in parallel is the capacitance of the tuning capacitor.
Here, the resonance frequency of the resonance circuit including the motor coil 422 is set in accordance with the reception frequency of any of the standard radio waves described above. For example, the resonance circuit in which the capacitor 47A (C1) is effective alone is set so that the resonance frequency is 60 kHz, and the resonance circuit in which both the capacitors 47A and 47B (C1 + C2) are effective is set to 40 kHz. ing. These resonance frequencies are set by the capacitors C1 and C2 of the capacitors 47A and 47B.

As shown in FIG. 8, the long wave standard radio wave to be received by the antenna 21 generates a magnetic flux B2 that passes through the motor coil 422 together with the magnetic flux B1 that passes through the antenna 21.
Here, if the tuning capacitor (C1, C2) is connected to the motor coil 422 to form a resonance circuit, and the resonance frequency of the resonance circuit is tuned to the long wave standard radio wave to be received, the motor coil 422 is provided. Resonant current is generated in the resonance circuit by the magnetic flux B2 passing through the magnetic flux B2, and the magnetic flux B2 increases and the magnetic flux B3 of the sub magnetic path also increases. The magnetic flux B3 in the sub magnetic path of the motor coil 422 acts on the antenna 21, and increases the electromotive force of the antenna 21 together with the original magnetic flux B1 of the received radio wave, thereby increasing the reception sensitivity. Further, the magnetic flux B4 in the sub magnetic path of the antenna 21 is strengthened by arranging the motor coil 422 tuned to the reception frequency on the path, and acts to increase the reception sensitivity of the antenna 21.

Thus, by connecting the tuning capacitors (C1, C2) to the motor coil 422, the motor coil 422 and the antenna 21 are magnetically coupled, thereby enhancing the reception sensitivity of the antenna 21. The receiving frequency to be tuned can be switched by switching the tuning capacitor.
When both RP1 and RP2 are cut off, the tuning capacitor is disconnected from the motor coil 422, and the resonance circuit is released.
These switching operations are performed by a reception control signal (power-on control signal) and a frequency switching control signal (see FIGS. 1 and 3) from the drive control circuit unit 3 used for controlling the reception circuit 23 and the antenna tuning circuit unit 22 of the antenna 21. ) Can be performed by introducing it into the hour / minute driving circuit 42.

  The drive control circuit unit 3 (see FIG. 1), which is a drive control means, controls the hour / minute drive circuit 42, stops the second motor 411 and the hour / minute motor 421 while receiving external wireless information, and performs tuning. A capacitor is connected to the motor coil 422, and the antenna 21 and the motor coil 422 are magnetically coupled.

FIG. 9 shows specific switching control for each state performed from the drive control circuit unit 3 to the hour / minute drive circuit 42.
The hour / minute drive circuit 42 is in a state in which a clock is displayed (motor hand movement state), and during non-hand movement driving, the MOS 43A, 43B (P1, P2) are in a conductive state, and the MOSs 44A, 44B (N1, N2) are in a cutoff state When the coil 422 is fixed at the potential of the power supply Vdd, the state where the N2 is turned on and the P2 is cut off during driving operation (current flows from the terminal O1 to the terminal O2 of the motor coil 422), and the MOS 44A (N1) is turned on. By alternately switching between P1 and a state where P1 is cut off (current flows from the terminal O2 of the motor coil 422 to the terminal O1), it is possible to execute the movement of the motor 421.
In this state (motor operating state), the hour / minute driving circuit 42 is in the cut-off state of both the MOSs 48A and 48B (RP1 and RP2), and the tuning capacitors 47A and 47B (C1 and C2) are both connected to the motor coil 422. It is maintained in a state that has not been done.

The hour / minute drive circuit 42 is in the first reception mode (receiving 1) when receiving the reception control signal from the drive control circuit unit 3, and only the MOS 43A (P1) is turned on to connect the other MOSs 43B, 44A, 44B (P2). , N1, N2) are kept in the cut-off state to stop the movement of the motor 421 and the MOS 48A (RP1) is turned on to connect the capacitor 47A (C1) to the motor coil 422. Magnetic coupling is performed in common with the reception frequency of the antenna 21.
The hour / minute drive circuit 42 receives the frequency switching control signal from the drive control circuit unit 3 to enter the second reception mode (during reception 2), and conducts both the MOS 48A (RP1) and the MOS 48B (RP2) to conduct the capacitor 47A. , 47B (C1, C2) are connected in parallel to the motor coil 422, and the resonance frequency of the motor coil 422 is changed to be shared with the other reception frequencies of the antenna 21 and magnetically coupled.

Next, the operation when receiving time information will be described.
When the set reception start time is reached, the drive control circuit unit 3 switches the reception control signal on (H level signal) and operates the reception circuit 23 as shown in FIG. At the same time, the drive control circuit unit 3 stops outputting the motor driving pulses that were output every second, while outputting a predetermined pulse signal to the second driving circuit 41 and the hour / minute driving circuit 42. While the information is being received, the second motor 411 and the hour / minute motor 421 are stopped.

At this time, in the second motor 411, the MOSs 43A and 43B are turned on, and both ends of the motor coil 412 are connected to the potential Vdd so as to be in a short state. In the present embodiment, the power supply Vdd (high voltage side) is set to the reference potential (GND), and the power supply Vss (low voltage side) is generated as the power supply voltage.
On the other hand, in the hour / minute motor 421, each MOS 43A is turned on, the MOS 43B is turned off, and at least one of the MOSs 48A and 48B is turned on to connect one or both of the tuning capacitors 47A and 47B (C1, C2) to the motor coil 422. To configure a resonant circuit. As a result, the antenna 21 and the motor coil 422 are magnetically coupled, and the magnetic flux passing through the antenna 21 is enhanced using the resonance of the motor coil 422, and the reception sensitivity of the antenna 21 is improved.

The drive control circuit unit 3 short-circuits the motor coil 412 of the second motor 411 as described above, and then magnetically couples the motor coil 422 of the hour / minute motor 421 to the antenna 21, and in this state the receiver circuit 23 is Drive to start receiving time information.
When the receiving circuit 23 is activated, radio waves (time information) received via the antenna 21 are processed by the receiving circuit 23 and then stored in the storage circuit unit 24.
It is also possible to forcibly start (forced reception) by an operation of starting the reception operation by the external input device 8, but in this case also, when the reception operation is instructed by the external input device 8, the drive control circuit unit 3 First, after short-circuiting the motor coil 412 and fixing the voltage to a predetermined potential (for example, Vdd), the receiving circuit 23 is driven to start receiving time information.

The receiving circuit 23 also verifies whether the received time data is correct. Specifically, since the time information of the long wave standard radio wave is data for every minute, it is determined based on whether or not the received time data are data with different one minute intervals.
When the received time information is determined to be correct data, the time data is output to the second time counter 612 and the hour / minute time counter 622 according to the instruction of the drive control circuit unit 3, and the second time counter 612 and the hour / minute time counter 622 are output. The count value is corrected. At this time, the short state of the motor coil 412 is released, and the motor coil 422 is disconnected from the tuning capacitor.
When the count values of the time counters 612 and 622 are corrected and become different from the position counters 611 and 621, the mismatch detection circuits 613 and 623 receive the mismatch signal until the count values match. The drive control circuit unit 3 outputs the drive pulse signals PS1 and PS2 to drive the hands. Since the driving of the pointer is continued by fast-forwarding until each counter value matches, the pointer position is automatically corrected according to the reception time, and the time is adjusted.

According to the above-described embodiment, the following effects can be obtained.
(1) By connecting the tuning capacitors 47A and 47B to the motor coil 422, a resonance circuit that resonates with the frequency of the long-wave standard radio wave received by the antenna 21 can be configured, and the antenna 21 assists the reception performance of the antenna 21 and supports the antenna. The characteristics can be improved. That is, the motor coil 422 connected to the tuning capacitors 47A and 47B resonates with the long wave standard radio wave and forms a sub magnetic path by the magnetic flux B3 having the same reception frequency in the vicinity. The antenna 21 is arranged substantially in parallel with the motor coil 422, and the magnetic flux density is increased by the magnetic flux of the sub magnetic path of the motor coil 422, and the amount of magnetic flux passing through the antenna 21 is increased. Therefore, the antenna characteristics can be improved.

(2) A plurality of tuning capacitors 47A and 47B to be connected to the motor coil 422, and switching to connect either or both of them, so that the resonance frequency of the resonance circuit constituted by the motor coil 422 and the tuning capacitors 47A and 47B Can be selected. Thereby, even when the antenna 21 receives radio waves having a plurality of reception frequencies, it is possible to cope with improvement of antenna characteristics at each frequency.
(3) The tuning capacitors 47A and 47B and the switching MOS transistors 48A and 48B only need to be added to configure the resonance circuit. Since the motor coil 422 can use the coil of the existing motor 421 as it is, it can be implemented. Very easy.

(4) Since the antenna 21 is disposed along the inner peripheral surface 91A of the outer case 9, the distance between the end surface where radio waves are linked in the antenna 21 and the inner peripheral surface 91A at a position facing this end surface Can be made relatively large. For this reason, the magnetic field of the standard radio wave interlinking the coil 212 is less likely to be hindered by the outer case 9, and even when the metal outer case 9 is used, it is possible to suppress the deterioration of the antenna characteristics.
Therefore, since external wireless information can be received even when the metal case 9 is used, a high-quality appearance design can be obtained compared to the case where the case is made of plastic or the like. Fewer radio wave correction watches 1 can be provided. In addition, since it is not necessary to form a notch in the outer case 9 or to make the outer case a double case of plastic and metal, the manufacturing cost can be reduced. Furthermore, since the antenna 21 can be disposed close to the inner peripheral surface 91A, the length of the antenna 21 can be secured to some extent, the deterioration of the antenna characteristics can be prevented, and the timepiece 1 can be miniaturized.

(5) Since the motor coil 422 is disposed adjacent to the central portion of the antenna 21 in the axial direction where the current value generated by the linkage flux is the largest in the antenna 21, the motor coil 422 is arranged in parallel at the central portion of the antenna 21. Thus, more magnetic flux can be collected. Therefore, even if the length of the motor coil 422 is short, the sensitivity of the antenna 21 can be effectively improved by placing the motor coil 422 at the most appropriate position.
(6) The motor coil 422 is disposed on the center side of the outer case 9 with respect to the antenna 21, and the antenna 21 and the motor coil 422 are arranged side by side in a plane (as viewed from the surface of the outer case 9). Since they are not stacked in the cross-sectional direction, the movement, that is, the timepiece 1 can be thinned.
(7) Since the antenna 21 is arranged away from the high-capacity secondary power source (secondary battery) 72, it is possible to reduce the influence of the battery 72 having a metal case on the antenna characteristics, thereby further reducing the antenna characteristics. It can be further suppressed.
In addition, since the antenna 21 is arranged away from the reference vibrator 311, it is possible to prevent the signal of the reference vibrator 311 from being mixed in the received signal as noise, and the deterioration of the antenna characteristics can be further suppressed.

(8) Since the antenna 21 is formed in a planar arc shape, the antenna 21 can be disposed along the case inner peripheral surface 91A over the entire length thereof. For this reason, the clearance gap between 91 A of internal peripheral surfaces and the antenna 21 can be made very small, the dead space inside case 9 can be eliminated, and the internal space of case 9 can be utilized effectively. For this reason, the exterior case 9 can be miniaturized, and for example, the antenna 21 can be incorporated even in a female wristwatch that is smaller than a male wristwatch.
In addition, since the motor 421 can be disposed along the arc-shaped inner surface of the antenna 21 and the motor coil 422 can be disposed on the antenna 21 side of the string connecting both ends of the core 211 of the antenna 21, the antenna 21 and the motor coil 422 The arrangement space can be reduced. Therefore, it is possible to secure a sufficient arrangement space for the train wheel 40, the battery 72, the ICs 81 and 82, etc. arranged in the case 9, and to increase the degree of freedom of layout.
(9) When the exterior case 9 is made of a material other than a metal material such as plastic, in order to ensure the required strength, the case 9 needs to be devised to make it thicker or provided with reinforcing ribs. Since the case 9 made of metal is used, when the thickness is the same as that made of plastic, the case 9 can be made stronger, or the thickness of the case 9 necessary to ensure the same strength. The dimensions can be reduced.

[Second Embodiment]
11 to 13 show a second embodiment of the present invention.
The first embodiment described above uses a coil of an existing motor 421 as the motor coil 422, and has a configuration in which a single coil 422 is wound around a core 425 as shown in FIG. On the other hand, in this embodiment, it is set as the structure provided with each of the coil which performs the function which assists the antenna 21, and the coil which becomes the original function of a motor coil.
In this embodiment, the motor coil 422 and the related drive circuit 42 are different from those in the first embodiment, but the other configurations are the same. For this reason, only a different part is demonstrated below, the same code | symbol is attached | subjected to the same or similar component as 1st Embodiment mentioned above, and description is abbreviate | omitted or simplified.

As shown in FIGS. 11 and 12, the motor coil 422 of this embodiment includes a two-layer coil around a core 425.
Of the motor coil 422, the inner layer is a motor coil portion 422A, and the outer layer is an auxiliary antenna coil portion 422B. These motor coil part 422A and auxiliary antenna coil part 422B are each formed by winding a uremet wire. Here, the wire of the motor coil portion 422A has a diameter of 20 to 30 μm, and the wire of the auxiliary antenna coil portion 422B has a diameter of 70 to 100 μm. That is, the wire rod of the auxiliary antenna coil portion 422B is slightly thinner than the winding diameter of the antenna 21, and the wire rod of the motor coil portion 422A is significantly thinner than about a fraction of the auxiliary antenna coil portion 422B. .

As shown in FIG. 13, in the drive circuit 42, the motor coil portion 422A has the same connection as the entire motor coil 422 of the first embodiment, and one terminal O1 is between the MOS 43A, 44A (P1, N1) and the other The terminal O2 is connected to the MOSs 43B and 44B (P2, N2). In the auxiliary antenna coil section 422B, one terminal O3 is connected to a pole on the opposite side of the MOS capacitors 48A and 48B (RP1 and RP2) of the tuning capacitors 47A and 47B (C1 and C2), and the other terminal O4 is connected to the power supply Vdd. Has been.
Accordingly, a bridge circuit is configured by the motor coil section 422A, the MOSs 43A and 44A (P1, N1), and the MOSs 43B and 44B (P2, N2), and the drive control of the motor 421 is performed as usual.
On the other hand, the auxiliary antenna coil section 422B is connected to tuning capacitors 47A and 47B (C1 and C2) by switching between the MOSs 48A and 48B (RP1 and RP2) to form a resonance circuit.
In this embodiment, since the auxiliary antenna coil section 422B and the resonance circuit such as a capacitor are separated from the motor coil section 422A, unlike the first embodiment, the MOS 43A (P1) is made conductive and the MOS 44A (P2 ) Is not mandatory. For this reason, in the present embodiment, the MOSs 43A, 44A (P1, P2) are both in a conductive state while the movement of the motor 421 is stopped, and both ends of the motor coil unit 422A are fixed to the power supply Vdd side and short-circuited with each other. Then, the energization for driving is stopped.

According to this embodiment, among the effects of the first embodiment described above, effects other than the effect (3) can be obtained, and the following effects can be further obtained.
(10) In the auxiliary antenna coil section 422B, by increasing the coil winding, the Q value at the time of resonance can be increased, and the magnetic flux B3 (see FIG. 8) of the secondary magnetic path can be increased. Thereby, the effect of improving the reception characteristics of the antenna 21 can be further enhanced.
(11) In the motor coil part 422A, it is not a thick winding diameter like the auxiliary antenna coil part 422B, but a sufficiently thin winding can be made like a normal motor coil, and the resistance value of the winding is ensured. Thus, an increase in drive current can be avoided.

(12) Since the motor coil unit 422A and the auxiliary antenna coil unit 422B have two layers, the original function as the motor coil as described above and the function of resonating and assisting the antenna reception performance depend on each function. Therefore, appropriate coil performance corresponding to each function can be ensured while sharing a mechanical space as the motor coil 422.
(13) Since the motor coil portion 422A and the auxiliary antenna coil portion 422B are arranged so that the motor coil portion 422A is on the inner side and the auxiliary antenna coil portion 422B is on the outer side, the outer auxiliary antenna coil portion 422B is disposed at the end of the motor coil 422. As a result, the leakage amount of the magnetic fluxes B2 and B3 is increased, the coupling amount of the secondary magnetic path to the antenna by the magnetic flux B3 is increased, and the antenna characteristics can be effectively improved.
(14) While the movement of the motor 421 is stopped, the both ends of the motor coil portion 422A are made conductive to each other to make a short state, so that no voltage is induced in the motor coil portion 422A and the auxiliary antenna coil being received is received. Unnecessary influence on the part 422B can be avoided.

The present invention is not limited to the above embodiments.
That is, the present invention has been illustrated and described primarily with respect to particular embodiments, but without departing from the spirit and scope of the present invention relative to the embodiments described above. Various modifications may be made by those skilled in the art in terms of shape, material, quantity, and other detailed configurations.

For example, in the embodiment, the configuration has two motors 411 and 421. However, as shown in FIG. 14, a single motor type timepiece having only one motor coil 431 may be used. The function of the auxiliary antenna may be obtained by connecting a tuning capacitor to such a motor coil 431, and the same operational effects as those of the above embodiments can be obtained. In addition, since there is only one motor, the space for arranging the motor can be reduced, and accordingly, the antenna 21 can be made longer, and the antenna 21 and the battery 72 can be arranged further apart. .
The present invention may be applied to a timepiece having three or more motors.
For example, in addition to an hour / minute motor and a second motor, a multi-motor configuration including a calendar motor and a chronograph motor may be used. In such a case, it is preferable for the effect of improving the reception performance of the antenna 21 to arrange a motor having the largest motor coil among a plurality of motors in the vicinity of the antenna and to function as an auxiliary antenna. Generally, the hour / minute motor that requires the greatest torque is the largest motor coil. Therefore, it is preferable that the motor coil of the hour / minute motor is magnetically coupled to the antenna as in the embodiment.

In the first embodiment, the antenna 21 is formed in a planar arc shape, but a linear core may be used as shown in FIG. In FIG. 15, the magnetic core 511 of the antenna 51 includes end portions 511A and intermediate portions 511B that connect the end portions 511A. Here, each of the end portions 511A and the intermediate portion 511B is formed in a straight line, and the antenna coil 512 is wound around the intermediate portion 511B.
A motor coil 431 is set in parallel with the intermediate portion 511 </ b> B of the antenna 51. At this time, the axial direction of the antenna 51 is the longitudinal direction of the intermediate portion 511B around which the coil 512 is wound, and the antenna 51 and the motor coil are arranged so that the axial direction of the antenna 51 and the axial direction of the motor coil 431 are parallel. 431 are arranged side by side.
The function of the auxiliary antenna may be obtained by connecting a tuning capacitor to such a motor coil 431, and the same operational effects as those of the above embodiments can be obtained. Furthermore, since the antenna 51 is configured in a polygonal shape instead of a planar arc shape, the work of cutting the core 511 from the amorphous plate and the winding work of the coil 512 are more effective than the case of using the arc-shaped core. This can be easily performed, and the manufacturing workability of the antenna 51 can be improved.

The configuration of the antenna is not limited to that of each of the embodiments described above. For example, a planar polygonal antenna in which the intermediate portion 511B of the core 511 in FIG. 15 is configured by a plurality of linear portions and the coil 512 is wound around the core 511. May be used. This antenna, like the antenna 51 in FIG. 15, can easily cut out the core and wind the coil, and is closer to an arc shape than the antenna 51. The dead space can be made smaller than that of the antenna 51, and the space efficiency can be improved.
Furthermore, an antenna in which an intermediate part of the core is formed in an arc shape and both end parts are configured in a straight line may be used.
Moreover, as an antenna, the antenna which has a planar linear (bar shape) core may be sufficient. However, as in each of the above-described embodiments, it is advantageous to use a planar arc shape or the like in that it can be arranged along the inner peripheral surface 91A of the case and a space for arranging the movement 98 can be secured.

Moreover, the core of the antenna is not limited to the one having the same width dimension over the entire length, and the width dimension at both ends where the coil is not wound may be formed larger than the width where the coil is wound. If the width dimension of both ends of the core is increased in this way, the core volume can be increased without changing the thickness dimension of the coiled portion, and the antenna characteristics can be improved without increasing the antenna. can do.
In this case, it is preferable to wind an insulating tape having a thickness of about 20 to 30 μm around the portion where the coil of the core is wound. If the insulating tape is wound, the coil and the core can be reliably insulated, and when the core is formed in a rectangular cross section, the winding can be prevented from being cut at the corner edge of the core. In addition, if a substantially U-shaped winding frame made of polyester or the like is set at the end of the core step, that is, the portion where the coil is wound, the coil can be easily wound and the coil end can be wound. Breakage can be prevented.

  Further, the antenna arrangement position is not limited to the 9 o'clock direction of the timepiece in the case 9 as in the first embodiment, but may be other positions such as the 12 o'clock direction, 6 o'clock direction, and 3 o'clock direction of the timepiece. . However, the crown stem and button shaft are usually provided in the 3 o'clock direction, and the antenna must be arranged so as not to interfere with them. It is preferable. In particular, when the buttons are arranged at 2 o'clock and 4 o'clock, if the antenna is arranged in the 12 o'clock direction or 6 o'clock direction, the length of the antenna is limited so that the antenna and the motor coil do not interfere with the axis of the button. Therefore, it is most preferable to arrange the antenna in the 9 o'clock direction.

In addition, the relative position of the motor coil in the axial direction with respect to the antenna is preferably such that the motor coil 422 is arranged in parallel in the axial center of the antenna 21 as in the above embodiment. A motor coil may be provided side by side.
Further, in the above embodiment, only one motor coil is provided in parallel with the antenna 21, but two motor coils may be provided in parallel with the antenna 21. For example, a linear antenna may be disposed, and motor coils may be disposed on both left and right sides of the antenna, or two motor coils may be disposed on one side of the antenna so as to be separated in the axial direction of the motor coil. Further, one motor coil may be arranged in parallel with the antenna, and another motor coil may be arranged in parallel with this motor coil. A tuning capacitor may be connected to only one of these motor coils, or a tuning capacitor may be connected to all the motor coils.
That is, the motor coils used as elements that resonate with the antenna need only be arranged so that the axial direction thereof is substantially parallel to the axial direction of the antenna, and the number and location of the motor coils are appropriately determined in consideration of the layout of the watch. You only have to set it.

Further, the antenna and the motor coil may be arranged in parallel in the thickness direction (cross-sectional direction) of the watch. That is, you may arrange | position a motor coil in the dial plate side or back cover side of an antenna. Furthermore, when there are two motor coils, one motor coil is juxtaposed in the plane direction with respect to the antenna as in the above embodiment, and the other motor coils are juxtaposed in the thickness direction of the watch with respect to the antenna. May be.
However, when the antenna and the motor coil are juxtaposed in the thickness direction of the timepiece, the thickness dimension of the timepiece increases. Therefore, especially when a thin shape is required as in a wristwatch, the plane of the timepiece as in the above embodiment is used. It is preferable to arrange in parallel.

Further, the exterior case 9 in the timepiece 1 of the present invention is not limited to a metal case, and for example, as shown in FIG. 16, a metal cover 111 such as stainless steel or titanium is attached to the surface of a plastic case 110. May be good. Further, the outer case 9 may be made of a non-conductive material such as a synthetic resin or ceramic, or may be made of a metal layer formed by subjecting these plastics or the like to a surface treatment such as metallic coating. Good. However, if at least a part of the outer case is made of metal, there is an advantage that a high-quality appearance can be obtained.
Further, the back cover 93 is not limited to a metal one, and for example, as shown in FIG. 16, a glass plate 93B fitted into a metal outer ring 93A may be used. If a part of the back cover 93 is made of glass, radio waves can easily enter the exterior case 9 from the glass plate 93B, so that the receiving sensitivity can be improved. Similarly, if the dial 95 is also made of plastic, radio waves can easily enter the case 9 and reception sensitivity can be improved.

In the above embodiment, the core 211 is manufactured by forming an amorphous foil in a plane rectangular shape and laminating it in the plane direction of the timepiece 1, but the amorphous foil is formed in a plane curved shape and the thickness direction of the timepiece 1 ( The core may be manufactured by laminating in the direction connecting the back cover 93 and the surface glass 92 of the timepiece 1.
Furthermore, the core of the antenna is not limited to the one constituted by the laminated amorphous foil, and a magnetic material such as a ferrite core may be used.

Further, the length of the antenna core can be set as appropriate. For example, if the antenna core is formed in an arc shape, the central angle can be increased to about 180 degrees, and further can be 180 degrees or more. The antenna characteristics are improved when the antenna is longer. Therefore, when the antenna length is at least about 15 mm, the central angle may be about 50 to 60 degrees, but it is preferable to increase the central angle in order to further improve the antenna characteristics. On the other hand, when the central angle is 180 degrees or more, the axial direction of both ends of the antenna 21, that is, the direction in which the interlinkage magnetic field (magnetic flux) enters and exits, and the direction of the magnetic flux in the intermediate part of the antenna 21 are 90 degrees or more. Since the flow of the magnetic field component is not smooth, it is not preferable to increase it greatly exceeding 180 degrees. Therefore, when the length of the antenna core is formed in a circular arc shape or a polygonal shape approximate to the circular arc, it is preferable that the central angle is within a range of about 50 degrees to 240 degrees. In consideration of the above, it is preferable that the central angle is in the range of about 60 to 180 degrees. In practice, it may be set in consideration of an arrangement space of other parts such as a motor coil and a battery.
Even when the core is not formed in an arc shape, the positional relationship between the end faces may be the same as in the arc shape.

Furthermore, in the present invention, a step motor or the like generally used in a timepiece can be used as a motor in which a tuning capacitor is connected to a motor coil. Accordingly, a core used for a step motor of a general timepiece such as Permalloy can be used as the motor core.
Further, the drive control circuit unit 3 of the above embodiment stops the motor that drives the pointer while driving the receiving circuit 23, but is unnecessary even while the receiving circuit 23 is driving. It may be controlled to drive the motor while receiving various data.
That is, among the hands, the hour hand and the minute hand are normally driven by one step motor, but if the drive pulse for this motor is applied once per minute, the hour and minute hands can be driven correctly.

As shown in FIG. 17, the standard radio wave JJY, which is Japanese time information, transmits 60-bit time information per cycle for one minute (60 seconds). Information (unnecessary data) such as “day information” that is not necessary for direct time correction is transmitted. Therefore, in the standard radio time code, while the data valid for the radio wave correction process for 0 to 49 seconds is being received, the motor is stopped and the data unnecessary for the radio wave correction process for 50 to 59 seconds is received. If the motor is driven during this time, correct time correction processing can be performed. In addition, since the motor drive pulse can be output while unnecessary data is being received, the hour / minute hands that can be driven with one motor drive pulse per minute can be activated while external wireless information is being received, and the correct time display is maintained. it can.
Therefore, the motor can be driven during the operation of the receiving circuit, and stable data reception can be performed while giving the correct time indication.

In addition, when the receiving circuit 23 starts operating with the power of the receiving circuit 23 turned on, it takes time until the circuit is stabilized. Therefore, if the receiving circuit 23 is frequently turned on and off, it is difficult to operate stably. If the operation is continued during data reception, the stability of the receiving circuit 23 can be improved.
Whether the currently received data is valid data corresponding to 0 to 49 seconds of the time code or invalid data corresponding to 50 to 59 seconds is determined by, for example, the counter of the second time counter 612 of the clock. Can be done by value. That is, since the pulse necessary for driving the motor can be output in one second or less, for example, it may be set to drive the motor by outputting the motor driving pulse when the time code is 55 seconds. On the other hand, since the time indication error at the time of radio wave reception in the radio-controlled timepiece is usually 1 second or less, if the motor is driven when the counter value is 55 seconds, the standard radio wave JJY received at that time is also , 54 to 56 seconds of information that is not necessary for time correction is transmitted, motor driving is stopped during reception of valid data, and motor control is easily performed during reception of invalid data. Can do.

On the other hand, in the case of a timepiece having a second hand, it is necessary to output a motor drive pulse every second for a time indication to a motor that drives the second hand. For this reason, the second hand is driven when radio waves are received. In the motor, it is necessary to stop driving for indicating the time. However, if the counter value of the counter 612 is within the range of 50 to 59 seconds, driving the second hand with the motor drive pulse output for about 1 to 2 seconds affects reception of radio waves in the same way as with the minute hand. Therefore, for example, a control for driving the second hand to display the electric field intensity level at the time of radio wave reception may be performed at the time of radio wave reception.
In addition, the arrangement relationship between the antenna 21 and the battery 72 or the reference vibrator 311 is not limited to the above-described embodiment, and the battery 72 and the reference vibrator 311 may be arranged with an interval that does not affect the reception of the antenna 21. .
Furthermore, in each said embodiment, although the coil was wound to the both-ends vicinity of a core, you may wind a coil only in the intermediate part of a core. However, in terms of antenna characteristics and space efficiency, it is preferable to wind the coil to the vicinity of both ends of the core as in the above embodiment.

Further, the radio information received by the antenna 21 is not limited to the long wave standard radio wave including time information. For example, even when receiving time information, a weak radio wave of 300 MHz band, a specific low power radio of 400 MHz band, Bluetooth (Bluetooth) of 2.4 GHz band, or the like may be used as the radio signal. When receiving these radio waves, since the frequency is high, the number of turns of the coil 212 may be small, and the antenna 21 can be made small.
In addition to the wireless communication using radio waves, other wireless communication methods such as an electromagnetic coupling method and an electromagnetic induction method may be used. Note that the electromagnetic coupling and electromagnetic induction methods require communication devices to be close to each other. However, if a non-magnetic material such as stainless steel is used, it is possible to communicate through a metal part. There exists an advantage which can be comprised with metal, such as.

Furthermore, radio information communicated using the antenna 21 is not limited to time information. For example, an IC card function may be built in the watch 1 and used to transmit and receive information such as train commuter passes and various prepaid IC cards. For example, an IC chip and an antenna may be incorporated in the case 9 so that information can be exchanged by placing a wristwatch close to a ticket gate using a smart card, an entrance / exit management machine, various billing machines, or the like. In this case, it is not necessary to insert and remove the IC card separately, and it is only necessary to bring the hand with the watch close to it, so that the operability can be greatly improved. Whether the data included in the external wireless information is valid data or invalid data may be set in accordance with a function incorporated in each clock.
Therefore, the antenna 21 incorporated in the outer case 9 of the present invention may be used exclusively for reception as in the case of receiving a standard radio wave, or transmits and receives information like a tag using a non-contact IC. May be used exclusively for transmission, or may be used exclusively for transmission, and these may be appropriately selected according to the type of electronic timepiece to which the present invention is applied, that is, the electronic device with a built-in antenna.

The electronic apparatus with a built-in antenna according to the present invention is not limited to the above-described radio-controlled timepiece, and can be applied to various electronic apparatuses such as an electronic apparatus provided with only the IC card function. For example, electronic devices include measuring devices such as pulse and body temperature, communication, communication devices having a call function, calendars and schedules, portable information terminal devices having an address book function, portable computers having an electronic calculation function, The present invention can be applied to electronic devices having various wireless information communication functions, such as music and image, AV equipment having a video playback function, and personal information management equipment having a non-contact communication function.
Also in these electronic devices, for example, a liquid crystal display unit or the like is provided in the main body so that information received by an antenna incorporated in the outer case 9 or transmitted to the outside, for example, information such as balance information and usage history is displayed. It may be. Furthermore, the user ID information may be communicated from the electronic device, and the information may be provided to the user from the system side communicating with the electronic device. For example, when getting in and out of transportation, entering or leaving an event venue or store, or going to or going to a company, a message is sent to all users, or a special message (specified by ID) ( Benefit point guidance, event information) may be sent.

  The antenna 21 is not limited to the loop antenna, and other antennas such as a derivative antenna may be used, and these may be set as appropriate according to the type of wireless information to be transmitted or received. In addition, when using a loop antenna, you may use the thing in which the magnetic body core is not inserted.

It is a block diagram which shows the structure of 1st Embodiment of this invention. It is a perspective view which shows the structure of the antenna of the said 1st Embodiment. 2 is a block diagram illustrating a configuration of a receiving circuit according to the first embodiment. FIG. It is a schematic plan view of the timepiece of the first embodiment. It is a schematic sectional drawing of the timepiece of the first embodiment. It is a circuit diagram which shows the drive circuit of the motor of the said 1st Embodiment. It is a circuit diagram which shows the motor coil and tuning capacitor of the said 1st Embodiment. It is the schematic which shows the magnetic coupling of the antenna and motor coil of the said 1st Embodiment. It is a signal waveform diagram which shows connection switching of the motor coil and tuning capacitor of the said 1st Embodiment. It is a signal waveform diagram which shows the motor pulse and reception control signal in the said 1st Embodiment. It is a side view of the motor coil of 2nd Embodiment of this invention. It is sectional drawing of the motor coil of the said 2nd Embodiment. It is a circuit diagram which shows the motor coil and tuning capacitor of the said 2nd Embodiment. It is a schematic plan view which shows the modification of this invention. It is a schematic plan view which shows the other modification of this invention. It is a schematic sectional drawing which shows the other modification of this invention. It is a figure for demonstrating the time code format of a standard radio wave.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Radio wave correction clock, 2 ... Receiving means, 3 ... Drive control circuit part, 4 ... Drive means, 9 ... Outer case, 21, 51 ... Antenna, 71 ... Power generator, 72 ... High capacity secondary power supply, 80 ... Circuit Substrate, 91 ... casing, 91A ... inner peripheral surface, 92 ... cover glass, 93 ... back cover, 95 ... dial, 96 ... ground plate, 211, 511 ... magnetic core, 212, 512 ... antenna coil, 311 ... standard vibration 411 ... second motor, 421 ... hour / minute motor, 412, 422, 431 ... motor coil, 422A ... motor coil part, 422B ... auxiliary antenna coil part, 47A, 47B ... tuning capacitor, 415,425 ... core.

Claims (7)

An exterior case, an antenna arranged in the exterior case for receiving external wireless information, a receiving means for processing external wireless information received by the antenna, a time display means, and driving of the receiving means and the time display means Drive control means for controlling
The antenna comprises a coil wound around a core,
The time display means includes a motor having a motor coil and a display unit driven by the motor,
The motor coil is juxtaposed in the vicinity of the antenna such that its axial direction is substantially parallel to the axial direction of the antenna,
A tuning capacitor that resonates the motor coil at the reception frequency of the antenna is connected to the motor coil in an intermittent manner,
The drive control means stops the motor while receiving the external wireless information, and connects the tuning capacitor to the motor coil to magnetically couple the antenna and the motor coil. An electronic watch with a built-in antenna. The electronic watch with a built-in antenna according to claim 1,
There are multiple types of reception frequencies of the antenna and the receiving means,
An electronic timepiece with a built-in antenna, wherein the tuning capacitor can switch a plurality of capacitors in accordance with each reception frequency. In the electronic timepiece with a built-in antenna according to claim 1 or 2,
At least a part of the outer case is made of metal,
The antenna-equipped electronic timepiece, wherein the antenna is disposed between the motor coil and an inner peripheral surface of the outer case. In the electronic timepiece with a built-in antenna according to any one of claims 1 to 3,
The external wireless information is a standard radio wave,
The electronic timepiece with a built-in antenna, wherein the drive control means is capable of controlling display of the time display means based on time data included in the standard radio wave. In the electronic timepiece with a built-in antenna according to claim 4,
The drive control means disconnects the tuning capacitor from the motor coil and drives the motor while receiving data unnecessary for radio wave correction processing out of 60 bits constituting one cycle of the time data. An electronic watch with a built-in antenna. In the electronic timepiece with a built-in antenna according to any one of claims 1 to 5,
The electronic coil with built-in antenna, wherein the motor coil has a two-layer structure of a motor coil part and an auxiliary antenna coil part. The electronic timepiece with built-in antenna according to claim 6, wherein both ends of the motor coil are connected to each other while the external wireless information is being received to make a short state.

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