JP2002250784A - Wave correction watch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wave correction watch capable of automatically selecting the receiving frequency of a standard time wave signal and correcting time based on the received standard time wave signal. SOLUTION: A control circuit 14 makes a switch SW1 connect to a solid contact (a) to a contact (b) and a receiving antenna 111 receive an AM broadcasting. In the control circuit 14, an AM radio broadcast frequency list at every area is read out of an AM broadcast frequency memory 114. In an AM broadcast receiver circuit 113, the receiving intensity of the AM broadcast is measured. In the control circuit 14, a receiving area is specified based on the measured results and the list. According to the receiving area the frequency of the standard wave signal is selected and is output to a long wave receiving frequency memory 115. In the control circuit 14, the switch SW1 is made to connect the solid contact (a) to a contact (c) or (d) so as to set the resonance frequency at the selected frequency, in order to correct time based on the time data included in the standard time wave signal received with a long wave receiving circuit 112 by way of the receiving antenna 111.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio-controlled timepiece that corrects time by receiving a standard time radio signal.

[0002]

2. Description of the Related Art A radio-controlled timepiece receives, for example, a long-wave (40 kHz) standard-time radio wave that conveys Japan Standard Time with high accuracy, corrects the time based on the received radio wave, and displays an accurate time.

This type of radio-controlled timepiece has a built-in receiving system circuit for receiving a standard time radio signal, and a control circuit for driving a pointer driving system based on the received signal to correct the time. In the mode, the pointer position is corrected to a position corresponding to the time code of the received standard time radio signal.

[0004] By the way, in recent years, a frequency of 40 k
For an area where it is difficult to receive a standard time radio signal transmitted in Hz, a transmitting station for transmitting a standard time radio signal at a frequency of 60 kHz will be newly constructed in Kyushu.

Therefore, in order to receive a standard time radio signal, it is necessary to select and receive a standard time radio signal having a frequency of either 40 kHz or 60 kHz. 40k
Hz or 60 kHz to receive the standard time radio wave signal can be selected by manual switching,
There is a method of receiving standard time radio signals of 0 kHz and 60 kHz and selecting a reception frequency based on radio wave intensity.

[0006]

The above-mentioned radio-controlled timepiece is currently being put to practical use as a wristwatch, table clock or wall clock, and in recent years, a radio-controlled timepiece mounted on a car or the like has been commercialized. Is starting to be.

However, when the standard time radio signal is received in full code, the processing time for determining the code output time and the reception state is relatively long, for example, 3 to 4 minutes. In the above-described radio-controlled timepiece for in-vehicle use, especially when the timepiece moves in various directions in a short time while traveling, there is a possibility that stable reception may not be possible due to the directivity of the receiving antenna, the noise of the car engine, and the like. . Therefore, it is not possible to determine which of the standard time radio signals of 40 kHz and 60 kHz has the stronger radio wave intensity. In addition, during traveling, the fluctuation of the radio wave intensity of the standard time radio wave signal is large at 40 kHz or 6 kHz due to the surrounding environment, for example, a building, other vehicles, surrounding terrain, and the like.
There is a problem in that it is not possible to determine which of the standard time radio signal reception frequencies of 0 kHz should be selected.

The present invention has been made in view of the above circumstances, and an object of the present invention is to automatically select a reception frequency of a standard time radio signal, and to adjust the time based on the received standard time radio signal. To provide a radio-controlled timepiece capable of performing the following.

[0009]

In order to solve the above-mentioned problems, a radio-controlled timepiece according to the present invention is a radio-controlled timepiece that corrects the time by receiving a standard time radio signal, wherein a plurality of resonance frequencies can be set. With the set resonance frequency, the antenna unit for receiving the standard time radio wave signal and the broadcast radio wave, the measuring unit for measuring the reception intensity of the broadcast radio wave received by the antenna unit, and the measurement unit Specifying means for specifying a reception area where the broadcast radio wave is received based on the reception intensity of the broadcast radio wave; selecting means for selecting a frequency of a standard time radio signal based on the area specified by the specification means; and A receiving circuit for receiving a standard time radio signal of a frequency selected by the means, and a standard time radio signal received by the receiving circuit, and a time code included in the standard time radio signal And a correction circuit for correcting the response time.

Preferably, the apparatus further comprises storage means for storing a frequency of the broadcast radio wave and an area to which the broadcast radio wave is transmitted, wherein the specifying means includes: a reception intensity of the broadcast radio wave measured by the measurement means; The reception area is specified based on the stored frequency of the broadcast radio wave and the area where the broadcast radio wave is transmitted.

Preferably, the apparatus further includes a control circuit for supplying a control signal to the antenna unit so as to set a resonance frequency to a frequency selected by the selection unit, wherein the antenna unit includes a resonance coil, A plurality of capacitors each of which is connected to the resonance coil and sets a resonance frequency at which the standard time radio signal and the broadcast radio can be received, and a control signal received by the control circuit, is set by the resonance coil and the control signal. And a switch for connecting the capacitor.

According to the present invention, for example, in a radio-controlled timepiece mounted on a car traveling in a certain area, an AM radio broadcast radio wave specifying the area is received by the antenna unit and supplied to the measuring means. And in the measuring means, AM
The reception intensity of the radio broadcast wave is measured. A to be measured
The M radio broadcast radio wave is a mark for specifying the region because the frequency of the AM radio broadcast radio wave having a strong radio wave intensity differs depending on the region. The measured reception intensity and frequency information of the broadcast radio wave serving as landmarks of this area are supplied to the specifying means. In the specifying means, a receiving area is specified from an AM radio broadcast radio wave having a high receiving intensity.

[0013] Then, since the receiving area can be specified by the specifying means, the selecting means selects the frequency of the standard time radio station transmitting the standard time radio signal closest to the specified receiving area. Thereby, the standard time radio signal of the selected frequency is received by the receiving circuit.
Then, the correction circuit corrects the time to a time corresponding to the time code included in the standard time radio signal.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, a radio-controlled timepiece mounted on a car will be exemplified. FIG. 1 is a block diagram showing an embodiment of a signal processing circuit of a radio-controlled timepiece according to the present invention. FIG. 2 is a cross-sectional view showing an entire configuration of an embodiment of a hand position detecting device for a radio-controlled timepiece according to the present invention. FIG. 3 is a plan view of a main part of the hand position detecting device for a radio-controlled timepiece according to the present invention. FIG. 4 is a diagram showing an example of a forming pattern of a through hole of an hour wheel of a radio-controlled timepiece according to the present invention.
FIG. 5 is a diagram showing an example of a formation pattern of the light reflecting surface of the rotation detecting plate of the radio-controlled timepiece according to the present invention.

In the figure, 10 is a signal processing circuit of the radio-controlled timepiece, 11 is a radio wave receiving system, 12 is a reset switch, 13 is an oscillating circuit, 14 is a control circuit, 15 is a drive circuit, and 16 is a notifying means. emitting element, 17 denotes a buffer circuit, 18 is a drive circuit, a display device, V _cc is the power supply voltage 19, C ₁ -C ₆ capacitors, R ₁ to R ₈ are resistive elements, 100 watch body, 200 second hand driving System, 300 is the first reflection type optical sensor, 400 is the minute hand drive system, 500 is the hour hand wheel, 600 is the minute wheel as an intermediate wheel, 700 is the manual correction axis, 800 is the rotation detection plate, and 900 is the second Are respectively shown.

The radio wave receiving system 11 includes a receiving antenna unit 111
, A long wave receiving circuit 112, an AM broadcast receiving circuit 113, and A
An M broadcast frequency memory 114 and a long wave reception frequency memory 115 are provided.

The receiving antenna section 111 is adapted to support the frequency of broadcast radio waves and different standard time radio signals.
A plurality of resonance frequencies, for example, can be set AM radio broadcast waves of the frequency, 60 kHz, the resonant frequency of 40 kHz, the receiving antenna 111a, is constituted by the resonance coil L _1, a capacitor _{C 1, C 2, C 3} , and the switch SW1 ing.

The capacitor C ₁ is a capacitor for receiving AM radio broadcasting, the capacitor C ₂ is a capacitor for receiving a 60 kHz standard time radio signal, and the capacitor C ₃ is 40 kHz.
z is a capacitor for receiving a standard time radio signal.

One end of the resonance coil L ₁ is connected to the receiving antenna 1.
11a and is connected to a first electrode of the capacitor _{C 1, C 2, C 3} , the other end is connected to the first fixed contact a and the ground line of the switch SW1. Also, switch SW
1 of the second contact b, c, d are connected to the second electrode of the capacitor _{C 1, C 2, C 3} . Further, in this embodiment, the receiving antenna 111a and the resonance coil L ₁ is formed not using ferrite bar antenna.

Note that the resonance frequency is ｛1 / (2π (L
C) ^1/2 )｝ Then, the inductance L is 1.583MH, capacitance Cb of the capacitor C ₂ is 4.44NF, capacitance Cc of the capacitor C ₃ of the resonant coil L ₁ is 1
Each is set to 0.0 nF. The resonance frequency of the resonance circuit using the capacitors C ₂ and C ₃ is 60
kHz and 40 kHz.

The switch SW1 connects the fixed contact a to the contacts b, c, and c connected to the second electrodes of the capacitors C ₁ , C ₂ , and C ₃ in response to the control signal CTL ₁ output from the control circuit 14. Connect to d.

[0022] For this configuration, the switch SW1 is in the case of setting the resonance frequency for the AM radio broadcast, in accordance with the control signal CTL ₁ output from the control circuit 14, the fixed contact a of the capacitor C ₁ Contact b connected to two electrodes
Connect to In the case of setting the resonance frequency to 60kHz, the switch SW1, the control signal in response to CTL _1, it connects the fixed contact a to the contact c connected to the second electrode of the capacitor C _2. In addition, the resonance frequency is set to 40 kHz.
When the switch SW1 is set to the control signal CT
Depending on the L _1, it connects the fixed contact a to the contact d connected to the second electrode of the capacitor C _3.

Long wave receiving circuit 112 receives a long wave (for example, 40 kHz or 60 kHz) including a time code signal transmitted from, for example, a standard time radio station (not shown), performs predetermined signal processing, and converts the time code signal into a pulse signal S.
Output to the control circuit 14 as 112. Although not shown, the long wave receiving circuit 112 includes an RF amplifier, a detection circuit,
It is composed of a rectifier circuit and an integrating circuit.

The AM broadcast receiving circuit 113 has a variable capacitor (not shown) and has a function of measuring the reception intensity of the AM radio broadcast in the frequency domain where the AM radio broadcast is performed. AM broadcasting reception circuit 113, the control signal CTL ₂ to measure the reception intensity is input as the frequency list of the AM radio broadcast wave from the control circuit 14 measures the received strength of the AM radio broadcast wave in accordance with the frequency list. Then, the measured reception intensity and the frequency of the corresponding AM radio broadcast wave are subjected to predetermined signal processing, and output to the control circuit 14 as a pulse signal S113.

FIG. 6 is a diagram showing the frequency, the area, and the station name of the AM radio broadcast wave stored in the AM broadcast frequency memory. The AM broadcast frequency memory 114 stores the frequency and the area of the AM radio broadcast referred to when receiving the AM radio broadcast and specifying the area. For example, as shown in FIG. 6, the AM broadcast frequency memory 114 stores an NHK first frequency of 594 kHz in the suburbs of Tokyo.
It stores the frequency and area of the AM radio broadcast radio wave having a large transmission output, which is a key for each area such as the NHK second broadcast of 828 kHz in the case of broadcasting and Osaka. In response to a request from the control circuit 14, the AM broadcast frequency memory 114 outputs a stored frequency list of AM radio broadcast radio waves for each region to the control circuit 14 as a pulse signal S114.

If, for example, the standard time radio signal of the frequency selected by the control circuit 14 cannot be received due to bad radio reception conditions or the like, the long-wave reception frequency memory 115 retransmits the signal after a suitable time has elapsed. In order to receive the standard time radio signal of the frequency, the frequency of the standard time radio signal selected by the control circuit 14 is 40 kHz or 60 kHz.
Store z. When receiving the standard time radio signal again, the long wave reception frequency memory 115 outputs the stored frequency of the standard time radio signal to the control circuit 14 as a pulse signal S115 in response to a request from the reception control circuit 14. .

The reset switch 12 is turned on when returning various states of the control circuit to the initial state. When the reset switch 12 is turned on or at a predetermined time, the radio-controlled timepiece performs a series of operations for receiving a standard-time radio signal.

The oscillation circuit 13 includes a crystal oscillator CRY and capacitors C ₅ and C ₆ , and supplies a basic clock having a predetermined frequency to the control circuit 14.

When receiving the AM radio broadcast, the control circuit 14 connects the fixed contact a to the contact b connected to the second electrode of the capacitor C ₁ when receiving the AM radio broadcast. the control signal CTL ₁ to be output to the switch SW1.

Further, the control circuit 14 receives a pulse signal S 114 indicating a frequency list of AM radio broadcast waves for each area, which is input from the AM broadcast frequency memory 114.
Control signal C for measuring the reception intensity of AM radio broadcast waves
TL ₂ is output to the AM broadcast receiving circuit 11.

The control circuit 14 has a function of specifying a reception area. The control circuit 14 controls the AM broadcast receiving circuit 1
13, a pulse signal S113 indicating the reception intensity and the corresponding frequency of the AM radio broadcast wave input by the
A for each area stored in the broadcast frequency memory 114
The reception area is specified by referring to the frequency list of the M radio broadcast radio wave.

More specifically, when the reception intensity of the AM radio broadcast radio wave and the corresponding frequency are input from the AM broadcast reception circuit 113, the control circuit 14 compares the reception intensity of each frequency and determines that the reception intensity is the highest. The frequency of the AM radio broadcast radio signal is selected, and the frequency and the AM broadcast frequency memory 11 are selected.
The reception area is specified by comparing the frequency and the correspondence list of the reception area stored in 4.

More specifically, when the reception intensity of 666 kHz input from the AM broadcast reception circuit 113 is stronger than the reception intensity of the other signals such as 594, 693, and 873 kHz, the control circuit 14 controls the 666 kHz. And the frequency stored in the AM broadcast frequency memory 114 against the correspondence list of the reception area, and as shown in FIG.
It is a radio wave of the first broadcast K, and specifies that the reception area is near Osaka.

Similarly, the AM radio broadcast signal 59
The reception strength of 4 kHz is equal to the other 666, 828, and 8
If the reception strength is higher than 73 kHz, the AM
The radio broadcast radio wave is the radio wave of the NHK first broadcast transmitted from Tokyo, and specifies that the reception area is near Tokyo.

The control circuit 14 has a function of selecting the frequency of the received standard time radio signal. Control circuit 1
4 selects a frequency (40 kHz or 60 kHz) of a standard time radio signal to be received based on the specified area, and a signal S1 indicating the frequency of the selected standard time radio signal.
15 is output to the long-wave reception frequency memory 115 for reference when receiving again due to poor reception conditions. For example, the control circuit 14 determines the frequency (40 kHz or 60 kHz) of the standard time radio signal transmitted from the standard time radio signal transmitting station closest to the specified reception area as the reception frequency.

More specifically, for example, when the specified reception area is near Osaka, the control circuit 14 converts the received standard time radio signal to the frequency of the standard time radio signal transmitted from Kyushu, which is close to the reception area. It is determined to be 60 kHz. Then, the selected 60 kHz is stored in the longwave reception frequency memory 115.
Is output.

If the receiving area is near Tokyo, the control circuit 14 converts the received standard time radio signal to the frequency 4 of the standard time radio signal transmitted from Fukushima prefecture near the receiving area.
Determine 0 kHz. And a long-wave reception frequency memory 1
A signal S115 indicating the selected 40 kHz is output as the signal S15.

When receiving the standard time radio wave signal of the selected frequency, the control circuit 14 reads the reception frequency from the long-wave reception frequency memory 115 and sets the fixed contact a to the capacitor C ₂ or C ₂ corresponding to the frequency. connected to each _of the _three second electrode and the control signal CTL ₁ for connecting to the contact c or d to output to the switch SW1.

For example, when receiving the standard time radio signal of 60 kHz, the control circuit 14 sets the fixed contact a to the _{second terminal} of the capacitor C ₂ in order to set the resonance frequency of the resonance circuit of the receiving antenna unit 111 to 60 kHz. the control signal CTL ₁ for connecting to a connected contact c to the second electrode to output to the switch SW1. In addition, the control circuit 14
When receiving a standard time radio wave signal z likewise outputs a control signal CTL ₁ for connecting the fixed contact a to the contact d connected to the second electrode of the capacitor C ₃ to the switch SW1.

The control circuit 14 has a minute hand counter, a second hand counter, and a standard minute / second hand counter (not shown). The control circuit 14 receives the pulse signal S112 from the radio wave reception system 11 and receives, for example, the received standard time radio signal. Is compared with a predetermined reference range, and if the reception state is within the reference range, the control signals CTL ₃ , CTL ₄
Is output to the stepping motor for the second hand and the stepping motor for the hour, minute, and second via the buffer 17 to perform the initial setting of the pointer position, that is, to perform the zero-return operation. When the reception state is not within the reference range, Is the control signal CT
Without outputting the L _3, CTL _4, and outputs a drive signal DR ₁ to the drive circuit 15, the light emitting element 1 as a notification means
6 is emitted to notify the user that radio wave reception is almost impossible.

Further, when the receiving state is within the reference range, after performing the zero-return operation, the received radio signal is decoded, and as a result of the decoding, the time can be set (time data can be reproduced. In the case, the count control of various counters and the first and second reflection-type optical sensors 300 and 90 are performed based on the basic clock by the oscillation circuit 13.
0 according to the input levels of the detection signals DT ₁ and DT ₂ .
The time correction control is performed by outputting the control signals CTL ₃ and CTL ₄ to the second hand stepping motor 210 and the hour / minute / second stepping motor 410 via the buffer 17 to perform rotation control. On the other hand, as a result of decoding, if time cannot be set, control signals CTL ₃ and CT
Drive signal DR ₁ is output to drive circuit 1 without outputting L _4.
5 to make the light emitting element 16 emit light to notify the user that radio wave reception is not good.
Thus, the operation in the initial correction mode is completed.

Here, the criterion for determining the received radio wave state in the control circuit 14 will be described with reference to FIG.

The standard time radio wave of a long wave (for example, 40 kHz or 60 kHz) that transmits the present standard time with high precision is shown in FIG.
It is sent in the form shown in FIG. In particular,
500 ms for one second (s) for "1" signal
(0.5 s) A signal of 40 kHz or 60 kHz is transmitted. In the case of a “0” signal, 800 m is transmitted in one second (s).
s (0.8 s), a signal of 40 kHz or 60 kHz is sent, and in the case of a “P” signal, 2
40 kHz or 60 kHz for only 00 ms (0.2 s)
Is sent.

Here, the time code of the standard time radio signal will be briefly described with reference to FIG. Sent information includes minutes, hours,
It has been an accumulation date since January 1. Time data is transmitted at 1 bit / sec, and one minute is defined as one frame. In this frame, information of the above-described minutes, hours, and January 1 is added in the form of a BCD code. In addition, the transmitted data includes a marker called a P-code in addition to 0 and 1, and this P-code is present at several places in one frame, such as the minute (0 second), 9 seconds, 19 seconds, 29 seconds, 39 seconds, 49 seconds, 5
Appears at 9 seconds. The position where the P code appears continuously is the minute position. In other words, time data such as minute / hour data and the like in the frame are determined based on the minute minute position, so that the time data cannot be extracted unless the minute minute position is detected.

As shown in FIG. 7B, when the reception state is good, the control circuit 14 sends the long wave reception circuit 112
The signal S112 is input as a pulse signal according to the presence or absence of 40 kHz or 60 kHz. In this case, it is determined that the reception state of the received standard time radio signal is within a predetermined reference range.

On the other hand, the control circuit 14 determines that the reception state is out of the reference range when the radio wave is weak or the noise is large. If the radio wave is very weak,
As shown in (c), low signal (L) for several signals
Or high level (H). When there is much noise, the level changes irrespective of the standard time radio wave. The signal S112 in these states is, for example, 2
If it has been received twice or more times, it is determined that the reception state is outside the reference range. Specifically, for example, when the detection time is about 10 seconds, the level change is 1 in the time.
NG when not detected within seconds and when the detected pulse width is not around 0.8, 0.5, 0.2 seconds
When NG occurs twice or more, it is determined that reception is impossible.

The control circuit 14 decodes the pulse signal S112 by the long wave receiving circuit 112, and as a result of the decoding,
When the time can be set, the count control of various counters and the input levels of the detection signals DT ₁ and DT ₂ by the first and second reflective optical sensors 300 and 900 are performed based on the basic clock by the oscillation circuit 13. Accordingly, the time correction control is performed by outputting the control signals CTL ₃ and CTL ₄ to the second hand stepping motor 210 and the hour / minute hand stepping motor 410 via the buffer 17 to perform rotation control. On the other hand, as a result of decoding, if time data cannot be converted, the control signals CTL ₃ and CTL ₄
Without outputting the display signal DSP, for example,
To display to the user that the radio wave reception is almost impossible.

The drive circuit 15 includes an npn transistor Q ₁ and resistance elements R ₁ and R ₂ . The collector of the transistor Q ₁ is connected to the cathode of the light emitting element 16 composed of a light emitting diode, the emitter is grounded, and a base connected to the output line of the drive signal DR ₁ of the control circuit 14 via a resistor R _2. Also,
Resistive element R ₁ is the supply line of _the power supply voltage V _cc emitting element 1
6 is connected to the anode. That is, the light emitting element 1
6 is a high-level drive signal DR from the control circuit 14.
Drive circuit 15 emits light when ₁ is output
Is connected.

The drive circuit 18 includes npn transistors Q ₂ and Q ₃ and resistance elements R _{5 to} R ₈ .

As shown in FIG. 2, the timepiece main body 100 has a middle plate 120 disposed at a substantially central portion of a space formed by the lower plate 100 and the upper plate 130 while being connected to the lower plate 110. The second hand drive system 200, the first reflection type optical sensor 300, the second drive system 400, the hour hand wheel 500, the minute wheel, with respect to predetermined positions of the inner lower plate 110, the middle plate 120, and the upper plate 130. 600, a manual correction axis 700, and a second reflection type optical sensor 900 are fixed or supported.

The second hand drive system 200 includes a first stepping motor 210, a first fifth wheel & pinion 220, and a second hand wheel 2
30. The first stepping motor 210 has a configuration in which the stator 210 a is mounted on the lower plate 110, and the rotor 210 b is supported by the lower plate 110 and the upper plate 130. second hand wheel based on the output control signal CTL ₃ 23
The rotation direction, rotation angle, and rotation speed of 0 are controlled.

The first fifth wheel & pinion 220 is rotatably supported by the lower plate 110 and the upper plate 130, and its wheel teeth are meshed with the rotor 210b of the first stepping motor 210 so that the rotation speed of the rotor 210b is reduced to a predetermined speed. Slow down. This first
The fifth wheel & pinion 220 is constituted so as to make one rotation every 15 seconds, for example, and a slit-shaped through hole 220a is formed in a part of the overlapping region with the second hand wheel 230.

The second hand wheel 230 has one end of its shaft
The second hand shaft 230a is press-fitted at the other end through the middle plate 120 toward the lower plate 110 at the other end. The second hand shaft 230a is inserted through a through hole 440b of a minute hand pipe 440a that penetrates a lower plate 110 to be described later and protrudes to a surface side on which a clock face and the like are formed. Can be Second hand wheel 230
The second hand pinion is engaged with the pinion of the first fifth wheel & pinion 220 such that the pinion rotates once every 60 seconds. In addition, the second hand wheel 23
In the part of the overlapping area of the first and fifth fifth wheels 220 with the first
The light reflecting surface 230b is formed to face the through hole 220a formed in the fifth wheel & pinion 220. The second hand drive system 200 is configured such that the second hand points to the hour when the light reflecting surface 230b is overlapped with the through hole 220a, that is, when the light reflecting surface 230b faces the hole 220a.

In the first reflection type optical sensor 300, a light emitting element 310 composed of a light emitting diode and a light receiving element 320 composed of an npn type transistor are provided side by side.
10 and the light receiving surface of the light receiving element 320 is the upper plate 1
30 through a through hole 130a formed in the first 5.
The second hand wheel 230 is disposed on the upper plate 130 so as to face the surface on which the light reflecting surface 230b of the second hand wheel 230 is formed through the through hole 220a of the second wheel 220.

Light emitting element 3 of first reflection type optical sensor 300
The anode 10 is connected to the other end of the resistance element R ₅ in the drive circuit 18 one end of which is connected to the supply voltage V _cc, the cathode is also connected to the collector of the arranged drivers transistors Q ₂ to the drive circuit 18 ing.
Emitter of the driver transistor Q ₂ is grounded,
The base is connected to the output line of the drive signal DR ₂ of the control circuit 14 via a resistor R _6. That is,
Emitting element 310 is connected to the drive circuit 18 so as to emit light when the drive signal DR ₂ of a high level is outputted from the control circuit 14.

Light receiving element 3 of first reflection type optical sensor 300
The collector of 20 with is connected to the power supply voltage V _cc through a resistor R _3, connected to the control circuit 14, the emitter is grounded. That is, the light receiving element 320
Indicates that the light emitted from the light emitting element 310
The light reaching the second hand wheel 230 via the light-reflecting surface 230b through the light-transmitting holes 130a and 220a.
only when received by the light receiving element 320 through the a, is inputted to the control circuit 14 a detection signal DT ₂ in the low level.

The minute hand drive system 400 includes a second stepping motor 410, a second fifth wheel & pinion 420, a third wheel & pinion 430, and a minute hand wheel 440. The second stepping motor 410 is configured such that the stator 410 a
0, and the rotor 410 b is connected to the lower plate 110 and the upper plate 13.
The rotation direction, the rotation angle, and the rotation speed are controlled based on an output control signal CTL ₃ of the control circuit 14 which is input via the buffer circuit 17.

The second fifth wheel & pinion 420 is rotatably supported by the lower plate 110 and the upper plate 130, and its wheel teeth are engaged with the rotor 410b of the second stepping motor 410, so that the rotation speed of the rotor 410b is reduced to a predetermined speed. Slow down.

The third wheel & pinion 430 is configured such that one end of a shaft portion has an upper plate 130.
, And the other end side is disposed so as to penetrate the middle plate 120, and the wheel tooth portion is engaged with the pinion portion of the second fifth wheel & pinion 420.

The minute hand wheel 440 has a through hole 440b at the center.
Is formed, and one end of the minute hand pipe 440a is pivotally supported by the middle plate 120, and the shaft portion on the other end side is formed by the lower plate 11
0, a through-hole 500 of an hour hand pipe 500a of an hour wheel 500 protruding toward the surface on which a timepiece dial or the like is formed
b, and a minute hand (not shown) is attached to the tip of the cartridge. The minute hand wheel 440 is configured to make one rotation every 60 minutes.
The second hand shaft 230a is inserted through 0b, and its ring tooth portion is meshed with the pinion portion of the third wheel & pinion 430. Such a minute hand wheel 44 has a so-called slip mechanism.

The hour wheel 500 has a through hole 500b at the center.
Is formed in a substantially T-shape with a ring-tooth portion formed in a watch body 1
The hour hand pipe 500a is disposed in the clock dial 00 and projects through the lower plate 110 toward the clock face of the watch. The hour wheel 500 is 1
It is configured to rotate by 30 ° in time and make one rotation in 12 hours, and the minute hand pipe 440a is inserted through the through-hole 500b as described above. A through hole 500d as a first light transmission portion is formed on a surface 500c of the hour wheel 500 facing the minute wheel 440. This hour wheel 5
00, as shown in FIG.
One of the positions equally divided into 12 at 30 ° in the circumferential direction of 0
It is formed at 11 places except the place. That is, the position detection is not performed for one hour of the twelve hours.

The minute wheel 600 is rotatably supported by a projection 110 a formed on the lower plate 110, and its wheel teeth are engaged with the minute hand pipe 440 a of the minute hand wheel 440, and the minute hand is set to the hour wheel 500. Of the minute hand wheel 44
The rotation speed of 0 is reduced to a predetermined speed and transmitted to the hour wheel 500. In addition, the minute wheel 600 is configured to make one revolution at N (N is a positive integer) time, and its wheel teeth mesh with the correction pinion 700a of the manual correction shaft 700 and partially. Are provided so as to face a part of the rotation detection plate 800.

The manual correction shaft 700 has a substantially T-shape.
A correction pinion 700a at the tip is pivotally supported by a projection 110b formed on the lower plate 110 in a state of penetrating an opening 130b formed on the upper plate 130, and a head 700b is moved from the upper plate 130 to a clock. It is arranged so as to protrude out of the main body 100. The manual correction shaft 700 is configured to rotate once every 60 minutes in the same phase as the minute hand wheel 440. As described above, the wheel teeth of the minute wheel 600 are engaged with the correction pinion 700a, and the minute hand is driven. When the minute hand wheel 440 is driven by the system 400, it rotates in the same phase as the minute hand wheel 440 via the minute wheel 600, and when the minute hand drive 400 is not operated, the head position is rotated by rotating the head 700b. It is configured to allow manual correction. Rotation detection plate 8
Reference numeral 00 denotes a disk, and the center portion of the center wheel 440 and the hour wheel 50 are rotated in accordance with the rotation of the center wheel 440.
It is fixed with its axis substantially aligned with the axis of the minute hand wheel 440 between zero. In addition, the hour wheel 50 of the rotation detecting plate 800
A light reflection surface 800a as a second light transmission portion is formed in a part of the region facing the surface 500c of the zero vehicle so as to face the through hole 500d as shown in FIG.

In the second reflection type optical sensor 900, a light emitting element 910 composed of a light emitting diode and a light receiving element 920 composed of an npn transistor are arranged in parallel, and the light emitting portion of the light emitting element 910 and the light receiving surface of the light receiving element 920 are arranged. , Through the through-hole 110c formed in the lower plate 110 and further through the through-hole 500d formed in the hour wheel 500, the rotation detecting plate 8
The light reflecting surface 800a is disposed on the lower plate 110 so as to face the surface 800b on which the light reflecting surface 800a is formed.

Light emitting element 9 of second reflection type optical sensor 900
One end of the anode of the power supply voltage V _ccDora connected to
Resistance element R in Eve circuit 18₇Is connected to the other end of
The cathode is a dry circuit which is also provided in the drive circuit 18.
Transistor Q_ThreeConnected to the collector. this
Driver transistor Q_ThreeEmitter is grounded and
Is the resistance element R₈Drive signal of the control circuit 14 via
DR_ThreeConnected to the output line. That is, light emission
The element 910 is driven from a high level by the control circuit 14.
Signal DR_ThreeDrive to emit light when output
It is connected to a circuit 18.

Light receiving element 92 of second reflection type sensor 900
The collector of 0 with is connected to the power supply voltage V _cc via a resistor R _4, is connected to the control circuit 14, the emitter is grounded. That is, the light receiving element 920
The light emitted from the light emitting element 910 reaches the surface 800b of the rotation detecting plate 800 via the through hole 500d, and the light reflected by the light reflecting surface 800a is received by the light receiving element 920 via the through hole 500d. Only when the detection signal DT ₁
Is input to the control circuit 14 at a low level.

The light reflecting surface 800 of the rotation detecting plate 800
The relationship between “a” and the through-hole 500d of the hour wheel 500 is set so that the minute hand and the hour hand (not shown) indicate the hour when the light reflecting surface 800a faces the through-hole 500d.

Next, the time adjustment control operation according to the above configuration will be described with reference to FIG. Here, it is assumed that the time at which the standard time radio signal is received is set to a predetermined time, for example, several minutes before and after the hour so that the signal can be received at every hour. It is also assumed that a series of operations for receiving a standard time radio signal are performed even when the reset switch 12 is turned on.

When the above-mentioned reception time or the reset switch 12 is turned on (ST1), the control circuit 14 of the radio-controlled timepiece sets the fixed contact a to a capacitor in order to switch the reception antenna unit 111 for AM broadcast reception. A control signal CT for connecting to a contact b connected to the second electrode of C ₁
L ₁ is output to the switch SW1. In the switch SW1, in accordance with the input control signal CTL _1, fixed contact a
Is connected to a contact b connected to the second electrode of the capacitor C ₁ for AM radio broadcast reception, and the receiving antenna unit 111
The resonance frequency is switched to AM radio broadcast reception (ST2).

Next, the control circuit 14 receives the pulse signal S114 indicating the frequency list of the AM radio broadcast radio waves for each area stored in the AM broadcast frequency memory 114 shown in FIG. AM
Control signal CLT for measuring the reception strength of radio broadcast waves
₂ is output to the AM broadcast receiving circuit 113. In the AM broadcast receiving circuit 113, according to the input frequency list,
The reception intensity of the AM radio broadcast wave is measured, and the reception intensity and the corresponding frequency of the measurement result are output to the control circuit 14 as a pulse signal S113 (ST3). For example,
In the AM broadcast receiving circuit 113, 594, 693, 66
The reception intensity of the AM radio broadcast wave for each region of 6, 828,... KHz is measured, and the reception intensity and the corresponding frequency are output to the control circuit 14 as a pulse signal S113.

In the control circuit 14, the AM broadcast receiving circuit 11
3, when the pulse signal S113 indicating the reception intensity of the AM radio broadcast radio wave and the corresponding frequency is input, the reception intensity of each frequency is compared, and the frequency of the AM radio broadcast radio signal having the highest reception intensity is selected. The frequency and the AM stored in the AM broadcast frequency memory 114 shown in FIG.
The reception area is specified by comparing the frequency of the radio broadcast and the corresponding list of the area (ST4).

For example, in the control circuit 14, the reception intensity of the AM radio broadcast wave at 666 kHz is changed to the other 594, 6
If the reception intensity is higher than 93, 873 kHz or the like, the AM radio broadcast wave is transmitted by N
This is a radio wave of the first broadcast of HK, and the reception area is specified as being near Osaka.

In the control circuit 14, for example, the reception intensity of the AM radio broadcast wave at 594 kHz is changed to 66
When the reception intensity is higher than 6, 828, and 873 kHz, the AM radio broadcast radio wave is the NHK first broadcast radio wave transmitted from Tokyo, and the reception area is specified as being near Tokyo.

Then, in the control circuit 14, step ST
4, the frequency (40) of the standard time radio signal transmitted by the nearest standard time radio signal transmitting station to the reception area.
kHz or 60 kHz) is selected (ST5). For example, when it is specified in step ST4 that the reception area is near Osaka, the control circuit 14 selects the frequency of the standard time radio signal to be 60 kHz transmitted from Kyushu. When the receiving area is specified to be near Tokyo, the frequency of the standard time radio signal is selected to be 40 kHz transmitted from Fukushima Prefecture.

Then, the control circuit 14 generates a pulse signal S115 indicating the frequency of the selected standard time radio signal in order to refer to the time when the standard time radio signal is not received properly and to receive the standard time radio signal again after an appropriate time. It is output to the long wave reception frequency memory 115. The long-wave reception frequency memory 115 stores the frequency of the standard time radio signal input from the control circuit 14 (ST6).

Next, in order to receive the standard time radio signal, the control circuit 14 sets the fixed contact a to the second electrode of the capacitor C ₂ when the frequency stored in the long frequency memory 115 is 60 kHz. control signal CTL ₁ for connecting to a connected contact c is outputted to the switch SW1.
Further, if the frequency stored in the long-wave frequency memory 115 frequency you are 40kHz is, the control circuit 14, a control signal CTL for connecting the fixed contact a to the contact d connected to the second electrode of the capacitor C _{3 1} is output to the switch SW1.

[0077] switch SW1 based on a control signal CTL _1, the fixed contact a connected to the contact c connected to the second electrode of the capacitor C _2, or the fixed contact a to the second electrode of the capacitor C ₃ It connects to the connected contact d, and switches the resonance circuit of the receiving antenna unit 111 to receive a standard time radio signal of a frequency of 60 or 40 kHz (ST7).

Then, the reception antenna section 111 receives the standard time radio wave signal, and the long wave reception circuit 112 generates a pulse signal S112 according to the reception state and outputs it to the control circuit 14 (ST8).

The control circuit 14 decodes the pulse signal S112 from the long wave receiving circuit 112, and as a result of the decoding, determines whether or not time data can be converted (time data can be reproduced) (ST9). ).

If it is determined in step ST8 that time data conversion is possible, reception of the standard time radio wave signal is stopped (ST10), and the time counter is set to the reception time. Then, the control signal CT is controlled in accordance with the count control of various counters based on the basic clock by the oscillation circuit 13 and the input levels of the detection signals DT1 and DT2 from the first and second reflective optical sensors 300 and 900.
L ₃ and CTL ₄ are output to the second hand stepping motor 210 and the hour / minute hand stepping motor 410 via the buffer 17 to perform rotation control, thereby correcting the hour, minute, and second time (ST11). Further, after or in parallel with the time correction, the display signal DSP is output to the display device 19 to correct the display time, and when the display time matches the time indicated by the time count, the process proceeds to the operation of step ST1 ( ST12, ST13).

On the other hand, if it is determined in step ST9 that the time data cannot be converted as a result of decoding, the control signals CTL ₃ and CTL ₄ are not output, and for example, the display signal DSP Is displayed to inform the user that radio wave reception is almost impossible. At this time, the display device 19 displays the time based on the previous data. Then, after an appropriate time has elapsed, the frequency stored in the long-wave reception frequency memory 115 is read, and the process proceeds to the operation of step ST8.

As described above, according to the present embodiment, the AM antenna broadcast wave having a high reception strength and having a different frequency for each region is received by reception antenna section 111, and the reception strength received by control circuit 14 is reduced. The reception area is specified based on the reception area, and the frequency of the standard time radio signal to be received is determined according to the specified reception area. Therefore, the frequency of the standard time radio signal that can be received well can be determined, and as a result, the time can be reliably corrected even when moving.

Further, in the present embodiment, since a ferrite bar antenna is used as the receiving antenna, it can be used for receiving a long wave and for receiving an AM radio broadcast. Therefore, there is an advantage that it is not necessary to newly provide a receiving antenna for AM radio broadcasting in addition to the conventional long wave receiving antenna.

The present invention is not limited to the above-described embodiment, and various suitable modifications are possible. For example, in the present embodiment, the radio-controlled timepiece is used as an in-vehicle radio-controlled timepiece. However, the present invention is not limited to this mode. For example, it may be used as a radio-controlled timepiece for a wristwatch.

Further, in this embodiment, the area is specified using the AM radio broadcast wave, but the present invention is not limited to this. For example, an area may be specified using a radio wave such as an FM radio broadcast wave and a TV broadcast.

In the present embodiment, the radio-controlled timepiece has been described as a timepiece having a second hand, but is not limited to this form. For example, it may be used for a radio-controlled timepiece having an hour and minute hand without a second hand. Moreover, you may use for a digital display type timepiece.

[0087]

As described above, according to the present invention,
It is possible to provide a radio-controlled timepiece that can automatically select the reception frequency of the standard time radio signal and can correct the time based on the received standard time radio signal.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a signal processing circuit of a radio-controlled timepiece according to the present invention.

FIG. 2 is a diagram showing an overall configuration of an embodiment of a hand position detecting device for a radio-controlled timepiece according to the present invention.

FIG. 3 is a plan view of a main part of a hand position detecting device of the radio-controlled timepiece according to the present invention.

FIG. 4 is a diagram showing an example of a forming pattern of a through hole of an hour wheel of a radio-controlled timepiece according to the present invention.

FIG. 5 is a view showing an example of a formation pattern of a light reflecting surface of a rotation detecting plate of the radio-controlled timepiece according to the present invention.

FIG. 6 is an AM stored in a radio-controlled timepiece according to the present invention.
It is a figure which shows the frequency of a radio broadcast radio wave, an area | region, and a station name.

FIG. 7 is a diagram for explaining a criterion for determining a received radio wave state in the control circuit according to the present invention.

FIG. 8 is a diagram showing an example of a time code of a standard time radio signal.

FIG. 9 is a flowchart for explaining the operation of the radio-controlled timepiece according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Signal processing system circuit 11 ... Radio wave receiving system 111 ... Reception antenna part 111a ... Reception antenna 112 ... Long wave reception circuit 113 ... AM broadcast reception circuit 114 ... AM broadcast frequency memory 115 ... Long wave reception frequency memory 12 ... Reset switch 13 ... Oscillation Circuit 14 Control circuit 15 Drive circuit 16 Light emitting element 17 as notification means 17 Buffer circuit 18 Drive circuit 19 Display device 100 Clock body 110 Lower plate 120 Middle plate 130 Upper plate 200 Second hand drive system 210: first stepping motor 220: second fifth wheel 220a: through hole 230: second hand wheel 230b: light reflecting surface 300: first reflection type optical sensor 400: minute hand drive system 410: second stepping motor 420 … Second 5th wheel 430… 3rd wheel 440… minute hand wheel 440a… minute hand pie 500 ... hour wheel 500d ... hole 600 ... date back wheel (Middle car) 700 ... manual correction shaft 800 ... rotation detection plate 800a ... light reflecting surface 900: second reflective optical sensor V _cc ... supply voltage C ₁ ~ C ₆ ... capacitor R ₁ to R ₈ ... resistance element

Claims (3)

[Claims] 1. A radio-controlled timepiece for receiving a standard time radio signal and correcting the time, wherein a plurality of resonance frequencies can be set, and the standard time radio signal and the broadcast radio are transmitted with a set resonance frequency. An antenna unit for receiving, a measuring unit for measuring the reception intensity of the broadcast radio wave received by the antenna unit, and a reception area where the broadcast radio wave is received is specified based on the reception intensity of the broadcast radio wave measured by the measurement unit. Specifying means; selecting means for selecting a frequency of the standard time radio signal based on the area specified by the specifying means; a receiving circuit for receiving the standard time radio signal of the frequency selected by the selecting means; and the receiving circuit The standard time radio signal received at
A radio-controlled timepiece having a correction circuit that corrects the time according to a time code included in the standard time radio signal. 2. A storage means for storing a frequency of a broadcast radio wave and an area for transmitting the broadcast radio wave, wherein the identification means stores the reception intensity of the broadcast radio wave measured by the measurement means and the storage means. The radio-controlled timepiece according to claim 1, wherein the reception area is specified based on a frequency of the broadcast radio wave and an area where the broadcast radio wave is transmitted. 3. A control circuit for supplying a control signal to the antenna unit so as to set a resonance frequency to a frequency selected by the selection unit, wherein the antenna unit includes a resonance coil and the resonance coil, respectively. A plurality of capacitors that are connected to and set a resonance frequency at which the standard time radio signal and the broadcast radio can be received, and a control signal received by the control circuit, the resonance coil and a capacitor set by the control signal. 3. The radio-controlled timepiece according to claim 1, further comprising a switch to be connected.