JP2009031157A - Radio controlled timepiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio controlled timepiece capable of simultaneously receiving a plurality of standard time radio signals in a simple configuration without using a switching element. <P>SOLUTION: A tuning circuit 1101b includes a first tuning coil (inductor) L111 and a second tuning coil (inductor) L112 for forming a receiving antenna, a first capacitor C111, a second capacitor C112, and a first node ND1 and a second node ND2 connecting both terminals of a tuning coil L111 respectively. The capacitor C111 is connected between the node ND1 and the second node, the serially connected tuning coil L112 and the capacitor C112 are connected between the node ND1 and the node ND2 in parallel to the tuning coil L111, and an output node of the tuning circuit 1101b by the node ND1 is formed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a radio-controlled timepiece that receives a standard time radio signal having a different frequency including the same time code and corrects the time.

  For example, a standard time radio signal transmitted at a frequency of 60 kHz from a standard radio broadcast station installed in Saga Prefecture or a standard time radio signal transmitted at a frequency of 40 kHz from a standard radio broadcast station installed in Fukushima Prefecture is received. A radio-controlled timepiece that corrects the time based on a standard time radio signal including the same time code is known.

  The transmission power of the standard radio wave with a frequency of 60 kHz is 50 kW, which is the same as the transmission power of the standard radio wave with a frequency of 40 kHz. For this reason, the standard radio wave with a frequency of 40 kHz can be received strongly in the region east of the Kanto region, and the standard radio wave with a frequency of 60 kHz tends to be received strongly in the same region in Kinki and in the region west of Kinki.

  Therefore, there is a demand for a function capable of receiving both 40 kHz and 60 kHz radio waves, and radio wave correction watches that respond to such requests have been proposed (see, for example, Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 6-214054 JP 2002-31167 A

  As a radio-controlled timepiece capable of receiving standard radio waves of different frequencies, as disclosed in Patent Document 1, a standard radio wave of a plurality of frequencies is converted into the same intermediate frequency by the heterodyne method, and is detected and incorporated. A radio-controlled clock that corrects the time of the clock body is known.

  However, there are many functions required for the receiving circuit unit, and there is a problem that the circuit scale increases and the power consumption also increases.

  As one of the solutions to the above problem, for example, Patent Document 2 is disclosed, but the selection operation of the reception frequency must be appropriately switched by a switching switch of the tuning circuit. Therefore, a switching element or the like is required for the selection operation of the reception frequency, and the selection operation of the reception frequency must be performed, which disadvantageously places a load on the signal processing circuit or the like.

  An object of the present invention is to provide a radio-controlled timepiece that can simultaneously receive a plurality of standard time radio signals with a simple configuration without using a switching element.

  A radio-controlled timepiece according to the present invention is a radio-controlled timepiece that corrects the time of an internal clock based on standard time radio signals of different frequencies including the same time code transmitted from a plurality of base stations. A tuning antenna that tunes the standard time radio signal of the different frequency received by the reception antenna and outputs the standard time radio signal of a desired frequency, and the tuning circuit includes: A first inductor that forms the receiving antenna; a second inductor; first and second capacitors; and first and second nodes to which both terminals of the first inductor are connected, respectively. The first capacitor is connected between the first node and the second node, and the second inductor connected in series in parallel with the first inductor. Data and the second capacitor is connected between the first node and the second node, the output node of the tuning circuit is formed by the first node.

  Preferably, the tuning circuit includes a third capacitor, and the third capacitor is connected between the first node and a connection point of the second inductor and the second capacitor. .

  Preferably, a first filter unit that passes only the standard time radio signal of the first frequency from the standard time radio signal output from the tuning circuit, and a second frequency from the standard time radio signal output from the tuning circuit. A second filter unit that passes only the standard time radio signal, the standard time radio signal of the first frequency that has passed through the first filter unit, and the second frequency that has passed through the second filter unit. A synthesizing unit that synthesizes a standard time radio signal, a detection unit that detects a synthesized wave of the standard time radio signal output by the synthesizing unit, and outputs a time code included in the synthesized wave of the standard time radio signal; Have

  Preferably, an amplifier circuit that amplifies the standard time radio signal output from the tuning circuit, and a first filter that passes only the standard time radio signal having a first frequency from the standard time radio signal output from the amplifier circuit. A second filter unit that passes only the standard time radio signal of the second frequency from the standard time radio signal output from the amplifier circuit, and the standard time of the first frequency that has passed through the first filter unit. A synthesis unit that synthesizes the radio signal and the standard time radio signal of the second frequency that has passed through the second filter unit; and a synthesized wave of the standard time radio signal output by the synthesis unit, and detects the standard time And a detector that outputs a time code included in the synthesized wave of the radio signal.

  According to the present invention, it is possible to provide a radio-controlled timepiece that can simultaneously receive a plurality of standard time radio signals with a simple configuration without using a switching element.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In this embodiment, for example, the radio-controlled timepiece is a standard time radio signal transmitted at a frequency of 40 kHz from a standard time radio wave transmission station in Fukushima Prefecture, and a standard time radio wave transmitted at a frequency of 60 kHz from a standard time radio wave transmission station in Kyushu. The signal is received, and the time is corrected based on the time code included in the standard time radio signal. Note that the transmission times of the two standard time radio wave transmission stations are the same Japan standard time, and the time code format is also the same.

  FIG. 1 is a block diagram showing an embodiment of a signal processing system circuit for a radio-controlled timepiece according to the present embodiment, and FIG. 2 is a diagram showing an example of the overall configuration of a pointer position detecting device for the radio-controlled timepiece according to the present embodiment. FIG. 3 is a plan view of the main part of the pointer position detecting device for the radio-controlled timepiece according to the present embodiment.

  In FIG. 1, 10 is a signal processing system circuit, 11 is a standard radio signal reception system, 12 is a reset / forced reception switch, 13 is an oscillation circuit, 14 is a control circuit, 15 is a drive circuit, and 16 is a light emitting element as a notification means. , 17 is a buffer circuit, 18 is a drive circuit, 20 is a correction switch group, 30 is a liquid crystal display panel, VCC is a power supply potential, C1 to C3 are capacitors, R1 to R5 are resistors, 100 is a watch body, and 120 is a second hand. A first driving system for driving, a second driving system for driving a minute hand and an hour hand as a pointer, 140 a light-transmitting light detection sensor, and 150 a manual correction system in which a user directly adjusts the time by hand. ing.

  Further, as shown in FIG. 4, the liquid crystal display panel 30 is provided on the lower side (6 o'clock side) from the substantially central pointer shaft of the dial 201. The liquid crystal display panel 30 can digitally display a calendar display under the control of the control circuit 14. In FIG. 4, 202 indicates a second hand, 203 indicates a minute hand, and 204 indicates an hour hand.

  FIG. 5 is a block diagram showing an embodiment of a standard radio signal receiving system of the radio-controlled timepiece according to this embodiment.

  The standard radio wave signal reception system 11 includes a long wave reception antenna unit 1101, an amplifier (amplification circuit) 1102, a first crystal filter 1103, a second crystal filter 1104, a synthesis unit 1105, and a detection circuit 1106.

  The standard radio signal receiving system 11 receives and detects standard time radio waves transmitted at different frequencies and the same time code, and outputs it to the control circuit 14 as a time code signal S11 which is a binarized signal pulse train.

  The long wave reception antenna unit 1101 includes a reception antenna 1101a and a tuning circuit 1101b.

  The tuning circuit 1101b can be set to a plurality of tuning frequencies, for example, 40 kHz and 60 kHz, so as to be compatible with different standard time radio signal frequencies. The tuning circuit 1101b tunes the standard time radio signal received by the receiving antenna to 40 kHz or 60 kHz, and outputs the standard time radio signal S1101b to the amplifier 1102. Details of the tuning circuit 1101b will be described later.

  The amplifier 1102 amplifies the standard time radio signal S1101b received by the long wave receiving antenna unit 1101 so that the amplitude is constant, and outputs the standard time radio signal S1102 to the first crystal filter 1103 and the second crystal filter 1104. To do. Details of the amplifier 1102 will be described later.

  The first crystal filter 1103 is a band-pass filter that passes only the standard time radio signal with a frequency of 40 kHz from the standard time radio signal output from the amplifier 1102.

  Similarly, the second crystal filter 1104 is a band-pass filter that passes only a standard time radio signal having a frequency of 60 kHz from the standard time radio signal input from the amplifier 1102.

  The synthesizer 1105 synthesizes the standard time radio signal with a frequency of 40 kHz output by the first crystal filter 1103 and the standard time radio signal with a frequency of 60 kHz output by the second crystal filter 1104, and synthesizes the standard time radio wave. The signal is output to the detection circuit 1106.

  Specifically, for example, the synthesizing unit 1105 is obtained by simply connecting one end of the first crystal filter 1103 and one end of the second crystal filter 1104, and has a frequency of 40 kHz output by the first crystal filter 1103. And the standard time radio signal with a frequency of 60 kHz output by the second crystal filter 1104 are added, and the standard time radio signal as a result of the addition is output to the detection circuit 1106.

  The detection circuit 1106 detects an envelope of the standard time radio signal, demodulates the time code included in the standard time radio signal, and outputs the demodulated time code to the control circuit 14.

(First configuration example of tuning circuit)
Next, a first configuration example of the tuning circuit 1101b will be described with reference to FIG. The tuning circuit 1101b includes both terminals of a first tuning coil (inductor) L111, a second tuning coil (inductor) L112, a first capacitor C111, a second capacitor C112, and a tuning coil L111 that form a receiving antenna. It includes a first node ND1 and a second node ND2 that are connected. Note that the inductances of the tuning coils L111 and L112 are Ln1 and Ln2, respectively. Further, the capacitances of the capacitors C111 and C112 are assumed to be Ca1 and Ca2, respectively.

  The capacitor C111 is connected between the node ND1 and the node ND2, and the tuning coil L112 and the capacitor C112 connected in series are connected between the node ND1 and the node ND2 in parallel with the tuning coil L111. An output node is formed. The node ND2 is connected to a ground potential (ground) GND.

  When a standard time radio signal is input from the receiving antenna 1101a via the tuning coil L111, the tuning circuit 1101b tunes the input signal and outputs a standard time radio signal S1101b having a frequency of 40 kHz or 60 kHz to the amplifier 1102.

  The tuning circuit 1101b has two resonance points. These two resonance points will be described using equations. The two parallel resonance points where the impedance is increased are given by the solution of the equation for the angular frequency ωp shown in the following equation.

  The angular frequency ωp1 that is one of the parallel resonance points satisfies the following expression.

  Further, the angular frequency ωp2 that is another parallel resonance point satisfies the following expression.

  Further, in the tuning circuit 1101b, the angular frequency ωs1 of the series resonance point at which the impedance becomes low is expressed by the following equation.

(Equation 4)
ωs1 = 1 / √ (Ln2 · Ca2) (Formula 4)

  In the present embodiment, a tuning circuit having two resonance points is obtained by using the tuning coils L111 and L112 having the respective inductances and the capacitors C111 and C112 having the respective capacitances satisfying the above-described (Formula 2) and (Formula 3). 1101b can be obtained. As a result, the tuning circuit 1101b can be tuned to a frequency of 60 kHz in a region where the standard time radio signal is a frequency of 60 kHz and to a frequency of 40 kHz in a region where the frequency is 40 kHz without using a switching element.

(Second configuration example of tuning circuit)
In this configuration example, a tuning circuit that can adjust the tuning frequency more easily than the tuning circuit 1101b of the first configuration example even when the inductance values of the tuning coils vary will be described with reference to FIG.

  A tuning circuit 1101ba shown in FIG. 7 is obtained by further adding a third capacitor C113 to the tuning circuit 1101b shown in FIG. Specifically, a capacitor C113 having a capacitance Ca3 is connected between the node ND1 and a connection point (node ND3) between the tuning coil L112 and the capacitor C112.

  Further, the standard radio signal receiving system employing this tuning circuit 1101ba is obtained by replacing the tuning circuit 1101b of the standard radio signal receiving system 11 shown in FIG. 5 with a tuning circuit 1101ba, and therefore the details of the figure are omitted. .

  Also in this embodiment, the tuning circuit 1101ba has two resonance points. These two resonance points will be described using equations. The angular frequencies ωp3 and ωp4 of the two parallel resonance points where the impedance is increased are given by the solution of the equation for the angular frequency ωp shown in the following equation.

  The angular frequency ωp3 that is one of the parallel resonance points satisfies the following expression.

  Further, the angular frequency ωp4 that is another parallel resonance point satisfies the following expression.

  Furthermore, in the tuning circuit 1101ba, the angular frequency ωs2 at the series resonance point where the impedance is lowered is expressed by the following equation.

(Equation 8)
ωs2 = 1 / √ (Ln2 (Ca2 + Ca3)) (Formula 8)

  Also in this configuration example, it is possible to obtain two resonance points by using the tuning coils L111 and L112 of the respective inductances and the capacitors C111 to C113 of the respective capacitances satisfying the above-described (Formula 6) and (Formula 7). Adjust as possible.

  In order to adjust these values, first, the inductance Ln1 of the tuning coil L111 is adjusted in the absence of the capacitors C112 and C113 to match a specific frequency (step STa). The capacitance Ca1 of the capacitor C111 is a fixed value.

  Next, after temporarily setting the capacitance Ca2 of the capacitor C112 to a predetermined value, the capacitance Ca3 of the capacitor C113 is adjusted to match the frequency of 60 kHz (step STb).

  Then, the capacitance Ca2 of the capacitor C112 is adjusted to 40 kHz (step STc).

  By executing step STb and step STc again, two parallel resonance points satisfying (Expression 6) and (Expression 7) can be easily obtained (Step STd).

  Next, FIG. 8 shows an example of impedance frequency characteristics obtained by computer simulation at this time.

  According to the computer simulation result shown in FIG. 8, two parallel resonance frequencies of 40 kHz and 60 kHz are generated. For example, the tuning circuit 1101ba can be tuned to a frequency of 60 kHz in a region where the standard time radio signal is a frequency of 60 kHz, and to a frequency of 40 kHz in a region where the standard time radio signal is 40 kHz.

  Table 1 shows the values of the capacitances Ca2 and Ca3 when the values of the capacitance Ca1 and the inductance Ln2 vary. However, the value of the inductance Ln1 is a value when the frequency is adjusted in advance to an appropriate frequency (for example, 59 kHz) with respect to the variation of the capacitance Ca1.

  For example, the combinations of inductances and capacitances in numbers 1 to 3 in Table 1 will be described as an example. The value of capacitance Ca1 is 2200 pF ± 2%, and the value of inductance Ln2 is 3.3 mH ± 5%. Even in this case, this configuration example shows that the values of the capacitances Ca2 and Ca3 can be easily adjusted.

  According to this configuration example, the tuning circuit 1101ba further includes the capacitor C113, so that the tuning circuit 1101ba is more resistant to variations in capacitance and inductance values than the tuning circuit 1101b according to the first configuration example, and the frequency can be increased simultaneously without using a switching element. Can be tuned.

  Next, a configuration example of the amplifier 1102 will be described. In this description, the above-described tuning circuit 1101ba is used for the tuning circuit.

  As shown in FIG. 9, the amplifier 1102 includes an npn transistor Q11, resistors R111 to R114, capacitors C114 to C116, and nodes ND4 to ND8.

  The capacitor C114 is connected between the nodes ND1 and ND4, the capacitor C115 is connected between the nodes ND5 and ND7, and the capacitor C116 is connected between the nodes ND6 and ND8. In addition, one electrode of each of capacitors C111 and C112 is connected to the ground potential GND.

  The resistor R111 is provided between the nodes ND4 and ND5, the resistor R112 is provided between the power supply potential VCC and ND5, and the resistor R113 is provided between the node ND6 and the ground potential GND for removing noise. R114 is connected between the nodes ND7 and ND8.

  The transistor Q11 has a base connected to the node ND4, a collector connected to the node ND5, and an emitter connected to the node ND6.

  Only the AC component of the standard time radio signal S1101b output to the node ND1 by the tuning circuit 1101ba passes through the capacitor C114 and is output to the node ND4. Transistor Q11 is self-biased, amplifies standard time radio signal S1101b at node ND4, and outputs the amplified signal to node ND6.

  Only the AC component of the standard time radio wave signal S1101b amplified by the transistor Q11 and output to the node ND6 passes through the capacitor C116 and is output to the node ND8. Further, only the AC component of the signal at the node ND5 passes through the capacitor C115 and is output to the node ND7.

  The amplifier 1102 outputs a differential signal obtained by inverting the potential between the signal S1102a output to the node ND7 and the signal S1102b output to the node ND8, thereby reducing the impedance at the time of resonance of the tuning circuit 1101ba.

  It will be described that the standard radio signal receiving system 11 having such a configuration can receive standard time radio signals transmitted at different frequencies and the same time code and demodulate the time code.

  A long standard radio wave that is transmitted by the standard radio signal receiving system 11 and accurately transmits the Japanese standard time is sent in a form as shown in FIG.

Specifically, the time transmitted from the standard time radio wave transmission station in Fukushima Prefecture and the standard time radio wave transmission station in Kyushu are both the same Japan standard time, and the time code format is also the same. The modulation method is amplitude modulation with a maximum value of 100% and a minimum value of 10%.
The time code consists of three types of signal patterns of 1, 0, and P, and is distinguished by a 100% amplitude period width in one signal pattern of 1 s (seconds), and 1, 0 and P are 500 ms, 800 ms, and 200 ms, respectively. ing.

Further, as shown in FIGS. 11 (a) and 11 (b), the transmission waveforms from the two standard time radio wave transmission stations are exactly the same in the modulation waveforms except that the carrier wave frequencies are different.
Since the standard time radio wave transmission station in Fukushima Prefecture and the standard time radio wave transmission station in Kyushu are about 1200 km apart, there is a phase difference depending on the point where the standard time radio wave is received.
Since the maximum distance difference between the two standard time radio wave transmission stations is 1200 km, the maximum phase difference is 4 ms when the radio wave propagation speed is 3 × 10 8 m / s.

  For this reason, the phase difference of 4 ms is a value that can be almost ignored in signal discrimination, and it can be considered that the time code patterns of the standard time radio signal overlap.

  FIG. 12 is a diagram showing carrier waveforms having a frequency of 40 kHz and 60 kHz transmitted from a standard time radio wave transmitting station and their combined waveforms.

In the standard radio signal receiving system 11, as shown in FIGS. 12A and 12C, when 40 kHz and 60 kHz of the standard time radio signal are received at the same level, the combined waveform is a sine wave. However, as shown in FIG. 12 (b), the waveform has a maximum amplitude twice as large as 20 kHz.
Therefore, as shown in FIG. 11C, the time code pattern of the composite waveform is also doubled.

  In the detection circuit 1106, as described above, the carrier wave of the standard time radio signal is not a sine wave, but can be detected without problems by envelope detection, which is the most basic detection method. Can be demodulated.

  When the reception state is good, the standard radio signal reception system 11 outputs a time code signal S11 as a pulse signal corresponding to the standard radio signal to the control circuit 14, as shown in FIG. The

Next, transmission data of the long wave standard radio wave will be described.
FIG. 13 shows an example of the time code of the standard time radio signal.

The transmission information is the accumulated date from minutes, hours, and January 1st.
The time data is transmitted at 1 bit / sec. One frame is one frame, and information on the accumulated date from the above-mentioned minute / hour / January 1 is provided as a BCD code in this frame. In addition to the 0 · 1, the transmitted data includes a marker called P code. This P code has several locations in one frame, and the minute (0 seconds), 9 seconds, 19 seconds, 29 seconds, Appears at 39, 49, 59 seconds. This P code appears continuously only once at 59 seconds and 0 seconds in one frame, and the position where this P code appears continuously becomes the minute position. In other words, since time data such as minute / hour data is determined in the frame with reference to this minute position, time data cannot be extracted unless this minute position is detected.

  In addition to the previous transmission data (at the time of the experimental station), the Japanese standard radio wave has been added with the last two digits, day of the week, minute parity, hour parity, spare bits and leap seconds that will be used when daylight saving time is introduced (Fig. 13 (b)). Of these newly established information, the spare bits, leap second information, and stop information will be described below.

  As shown in Table 2, the spare bits use SU1 and SU2. These are prepared for future information expansion. When this bit is used in daylight saving time information, when SU1 = SU2 = 0, “no change to daylight saving time within 6 days”, when SU1 = 1 · SU2 = 0, “change to daylight saving time within 6 days”, When SU1 = 0 and SU2 = 1, the information format is “daylight saving time in progress”, and when SU1 = SU2 = 1, “daylight saving time ends within 6 days”. Daylight saving time has not yet been introduced in Japan, and it is still unclear, but when it comes to European summertime changes, it often happens during the night.

  Next, the leap second uses two bits of LS1 and LS2 shown in Table 3, and when LS1 = LS2 = 0, “the leap second is not corrected within one month”, LS1 = 1 · LS2 = 0 Then, “There is a negative leap second (deletion) within one month”, that is, one minute is 59 seconds, and when LS1 = LS2 = 1, “There is a positive leap second (insertion) within one month”, that is, one minute is 61 seconds. The information form is as follows. The leap second correction timing has already been determined and is to be performed immediately before January 1 or July 1 of UTC time. Therefore, in Japan time (JTC), it will be performed immediately before 9:00 am on January 1 or July 1.

  As shown in (a), (b), and (c) of Table 4, the stop information uses ST1, ST2, ST3, ST4, ST5, and ST6, and the stop start notice is made in ST1, ST2, and ST3. In ST4, the stop time notice is provided, and in ST5 and ST6, stop information for the stop period notice is provided. First, the stoppage start notice will be described. When ST1 = ST2 = ST3 = 0, “No stoppage is planned”, and when ST1 = ST2 = 0 · ST3 = 1, “Stop within 7 days”, ST1 = 0 · ST2 = 1・ When ST3 = 0, “Stop within 3 days from 3”, ST1 = 0 ・ When ST2 = ST3 = 1, “Stop within 2 days”, When ST1 = 1 and ST2 = ST3 = 0, “Stop within 24 hours” In the case of “stop”, ST1 = 1 · ST2 = 0 · ST3 = 1 “stops within 12 hours”, and ST1 = ST2 = 1 · ST3 = 0 indicates “stops within 2 hours”. Next, the stop time notice is “only daytime” in ST4 = 1, and “all day or no stoppage plan” in ST4 = 0. Next, the stop period notice is “no stop plan” at ST5 = ST6 = 0, “stop for 7 days or longer or unknown period” at ST5 = 0 · ST6 = 1, “ “Stop within 2 to 6 days”, and ST5 = ST6 = 1 indicates “stop in less than 2 days”.

  As described above in detail about the transmission information by radio waves including the long time standard time information that is managed by the National Institute of Information and Communications Technology (NICT), in addition to the standard time information, information by spare bits, leap second information, Stop information is also included in the transmission information.

  Next, the signal processing system circuit 10 will be described with reference to FIG.

  The reset / forced reception switch 12 is turned on when various states of the control circuit 14 are returned to the initial state. When the reset / forced reception switch 12 is turned on or when a battery (not shown) is set, the radio-controlled timepiece enters a correction mode (forced correction mode) in which a standard time radio signal is forcibly received and corrected. Become.

  The oscillation circuit 13 includes a crystal oscillator CRY and capacitors C2 and C3, and supplies a basic clock having a predetermined frequency to the control circuit 14.

The control circuit 14 has a minute hand counter, a second hand counter, a standard minute / second counter, etc., not shown.
The control circuit 14 receives the time code signal S11 from the standard radio signal receiving system 11, compares the received state of the received standard radio signal with a predetermined reference range, and if the reception state is within the reference range. The control signals CTL1 and CTL2 are output to the second hand stepping motor 121 and the hour / minute hand stepping motor 131 via the buffer circuit 17 to detect the pointer position (initial setting), and the reception state is not within the reference range. Then, without outputting the control signals CTL1 and CTL2, the drive signal DR1 is output to the drive circuit 15 to cause the light emitting element 16 as the notification means to emit light and to inform the user that radio wave reception is almost impossible.

  The control circuit 14 performs initialization when the reception state is within the reference range, and then decodes the received radio wave signal. When the decoding can be timed, the oscillation circuit 13 The control signals CTL1 and CTL2 are sent to the stepping motor 121 for the second hand and the stepping motor 131 for the hour / minute hands via the buffer circuit 17 in accordance with the count control of the various counters based on the basic clock by and the input level of the detection signal DT1 by the light detection sensor. The fast-forwarding time control is performed by performing rotation control by outputting to. In addition, the control circuit 14 causes the liquid crystal display panel 30 to display the correction time.

  On the other hand, when the time cannot be set as a result of decoding, the drive signal DR1 is output to the drive circuit 15 without outputting the control signals CTL1 and CTL2, and the light emitting element 16 as the notification means is caused to emit light. To inform the user that the radio wave reception is not good. Thereby, the operation in the initial correction mode is completed.

  The control circuit 14 controls the normal correction mode after completing the operation of the initial correction mode. In the normal correction mode, the same operation as after the initial setting operation in the initial correction mode is performed.

Specifically, when the received radio wave signal is decoded and the time can be set as a result of the decoding, the count control of various counters based on the basic clock by the oscillation circuit 13 and the detection signal DT1 by the light detection sensor 140 are performed. In accordance with the input level, the control signals CTL1 and CTL2 are output to the second hand stepping motor 121 and the hour / minute hand stepping motor 131 via the buffer circuit 17 to perform the rotation control, thereby performing the fast-forward time correction control.
Then, the control circuit 14 causes the liquid crystal display panel 30 to display the correction time.

  On the other hand, when the time cannot be set as a result of decoding, the drive signal DR1 is output to the drive circuit 15 without outputting the control signals CTL1 and CTL2, and the light emitting element 16 as the notification means is caused to emit light. To inform the user that the radio wave reception is not good.

  In the above description, when it is determined that the reception state is outside the reference range, the radio wave is weak or there is a lot of noise. When the radio wave is very weak, as shown in FIG. 10C, the signal remains at the low level (L) or the high level (H) for several signals. When there is a lot of noise, the level changes regardless of the time radio wave. When the time code signal S11 in these states is received, for example, twice or more in 10 seconds, it is determined that the reception state is out of the reference range.

  Specifically, for example, when the detection time is about 10 seconds and the level change is not detected within 1 second and the detected pulse width is around 0.8, 0.5, 0.2 seconds. It is determined that the reception is impossible when the failure does not occur and the failure occurs more than once.

  The drive circuit 15 is composed of a pnp junction type transistor Q1 and resistors R1 and R2. The base of the transistor Q1 is connected to the output line of the drive signal DR1 of the control circuit 14 via the resistor R1, the collector is connected to the anode of the light emitting element 16 made of a light emitting diode via the resistor R2, and the emitter is of the power supply potential VCC. Connected to the supply line. The cathode of the light emitting element 16 is grounded.

  That is, the light emitting element 16 is connected to the drive circuit 15 so as to emit light when the low level drive signal DR1 is output from the control circuit 14.

  The drive circuit 18 comprises a pnp junction type transistor Q2 and resistors R3 and R4.

  The correction switch group 20 includes four correction mode switches 21, a display changeover switch 22, an up switch (UP) 23, and a down switch (DN) 24 for correcting the digital display of the liquid crystal display panel 30. Connected in parallel to the input terminal.

  For example, when the correction mode switch 21 is turned on, the control circuit 14 goes into the button correction mode. The control circuit 14 accepts the correction mode switch 21 during reception of the standard radio signal or during normal operation, and shifts to the button correction mode.

  The up switch 23 or the down switch 24 is, for example, a push button switch. When the digital display time is corrected, the control circuit 14 stops the output of the control signals CTL1 and CTL2 at the moment when these switches are pressed. The time is displayed on the liquid crystal display panel 30.

  The timepiece main body 100 will be described with reference to FIGS. 1 to 3 and FIGS. 14 to 22.

  The watch body 100 includes a lower case 111 as a second case and an upper case 112 as a first case that are connected to face each other to form an outline, and a space formed by the lower case 111 and the upper case 112. A middle plate 113 arranged in a state of being connected to the lower case 111 at a substantially central portion, and a first drive system with respect to predetermined positions of the lower case 111, the middle plate 113, and the upper case 112 in the space. 120, the second drive system 130, the light detection sensor 140, the manual correction system 150, and the like are fixed or pivotally supported.

  As shown in FIGS. 2, 3 and 14, the first drive system 120 includes a substantially U-shaped stator 121a, a drive coil 121b wound around a leg piece on one side of the stator 121a, and the stator 121a. A second hand stepping motor 121 constituted by a rotor 121c that is rotatably arranged between the other magnetic poles, and a first transmission gear (first detection gear) in which a large-diameter gear 122a meshes with a pinion 121C ′ of the rotor 121c. And a second hand wheel 123 as a second detection gear (first pointer wheel) meshed with the small-diameter gear 122b of the first fifth wheel 122.

  Here, in the second hand stepping motor 121, the stator 121a is mounted and fixed on the intermediate plate 113, the rotor 121c is pivotally supported by the intermediate plate 113 and the upper case 112, and the output control signal CTL1 of the control circuit 14 is supported. The rotation direction, rotation angle, and rotation speed are controlled based on the above.

  The first fifth wheel & pinion 122 is formed such that the number of teeth of the large-diameter gear 122a is 60 and the number of teeth of the small-diameter gear 122b is 15, and is pivotally supported by the lower case 111 and the upper case 112. The large-diameter gear 122a meshes with the rotor 121c (pinion 121c ′) of the second hand stepping motor 121 to reduce the rotational speed of the rotor 121c to a predetermined speed. As shown in FIGS. 14 and 16, the first fifth wheel & pinion 122 has three circular shapes arranged at equal intervals in the circumferential direction in the region overlapping the second hand wheel 123 (center angle α1 is 120 °). A through hole 122c is formed. The through-hole 122c not only allows the detection light of the light detection sensor 140 to pass, but at least one of them is used as a positioning hole (determining hole) when assembling the first fifth wheel & pinion 122. is there.

  In the second hand wheel 123, the large-diameter gear 123a has 60 teeth, one end of the shaft portion is pivotally supported by the upper case 112, and the second hand passes through the middle plate 113 to the lower case 111 side. A shaft 123b is press-fitted, and the second hand shaft 123b is inserted into a minute hand pipe 134p described later, and a second hand 202 is attached to the tip thereof. As shown in FIG. 17, the second hand wheel 123 has eleven circular shapes arranged at equal intervals in the circumferential direction (center angle α2 is 30 °) in a region overlapping the first fifth wheel & pinion 122 by rotation. A through-hole 123c is formed, and a positioning light-shielding portion 123d having a different pitch only at one place (the central angle between the through-hole 123c and the through-hole 122d is 60 °). The second hand is configured to indicate the hour when the through hole 122c of the first fifth wheel & pinion 122 first faces the through hole 123c after facing the positioning light-shielding portion 123d.

  The through-hole 123c not only allows the detection light of the light detection sensor 140 to pass through, but at least one of them is used as a positioning hole (determining hole) when the second hand wheel 123 is assembled.

  Further, inside these through-holes 123c, arc-shaped biasing springs 123e that are long in the circumferential direction and project in the direction of the rotation axis are defined by the cutout holes 123f. The arcuate urging spring 123e urges the second hand wheel 123 in the rotation axis direction.

  Here, the positioning light-shielding portion 123d is formed at a position away from the notch hole 123f in the circumferential direction, that is, at a region where the two notch holes 123f are separated from each other. Therefore, a sufficient distance between the cutout hole 123f and the positioning light-shielding portion 123e can be secured, so that the detection light does not go around the cutout hole 123f in the region of the positioning light-shielding portion 123d, and the positioning light-shielding portion 123d can reliably Detection light can be blocked. That is, since the positioning light-shielding portion 123d is formed at a position away from the area where the notch hole 123f is prone to erroneous detection due to detection light wraparound, the positioning light-shielding portion 123d is moved to the rotational angle position of the second hand wheel 123. By using this for positioning, reliable positioning can be performed.

  In the second hand wheel 123, as shown in FIG. 17, instead of providing a plurality (11) of through holes 123c, as shown in FIG. 18, a through hole 123c at a position facing the positioning light-shielding portion 123d in the radial direction. Other through-holes 123c may be formed integrally with the cut-out holes 123g, respectively. According to this, it is possible to further ensure the passage of the detection light in the portion where the detection light is allowed to pass, and to reduce the waste of the material forming the second hand wheel 123.

  As shown in FIGS. 2, 3, and 15, the second drive system 130 includes a substantially U-shaped stator 131a, a drive coil 131b wound around a leg piece on one side of the stator 131a, and the stator 131a. The second fifth wheel as an intermediate gear in which the large-diameter gear 132a meshes with the pinion 131c 'of the rotor 131c and the hour and minute hand stepping motor 131 constituted by the rotor 131c rotatably arranged between the other magnetic poles 132, the third transmission wheel 133 as a second transmission gear (third detection gear) in which the large diameter gear 133a is engaged with the small diameter gear 132b of the second fifth wheel 132, and the small diameter gear of the third wheel 133 A minute hand wheel 134 as a fourth detection gear (second pointer wheel) in which a large diameter gear 134a meshes with 133b, and a large diameter gear 135a on a small diameter gear 134b of the minute hand wheel 134. A minute wheel 135 of the day as meshed with the intermediate gear is constituted by the hour wheel 136 of the fifth detection gear in mesh with the small diameter gear 135b of the minute wheel 135 of the day (second hand wheel).

  Here, in the hour / minute hand stepping motor 131, the stator 131 a is mounted and fixed on the intermediate plate 113, and the rotor 131 c is pivotally supported by the intermediate plate 113 and the upper case 112. Based on this, the rotation direction, rotation angle, and rotation speed are controlled.

  The second fifth wheel & pinion 132 is formed such that the number of teeth of the large diameter gear 132a is 60 and the number of teeth of the small diameter gear 132b is 15, and is pivotally supported by the intermediate plate 113 and the upper case 112, and the large diameter gear 132a. Meshes with the rotor 131c (pinion 131c ′) of the hour / minute hand stepping motor 131 to reduce the rotational speed of the rotor 131c to a predetermined speed. As the second fifth wheel & pinion 132, the above-mentioned first fifth wheel & pinion 122 may be used, that is, the one provided with the through hole 122c may be used. Thereby, parts can be shared and the cost of the product can be reduced.

  In the third wheel 133, the large-diameter gear 132a has 60 teeth and the small-diameter gear 133b has ten teeth, and one end of the shaft portion is pivotally supported by the upper case 112, and the other end side has the intermediate plate 113. It is rotatably arranged in a penetrating state, and the rotation of the second fifth wheel & pinion 132 is decelerated and transmitted to the minute hand wheel 134. Further, as shown in FIG. 19, the third wheel & pinion 133 is arranged at equal intervals (center angle α3 is 36 °) in the circumferential direction in a region overlapping with the second hand wheel 123 and the first fifth wheel & pinion 122 by rotation. Ten circular through holes 133c are formed. The through-hole 133c not only allows the detection light of the light detection sensor 140 to pass through, but at least one of them is used as a positioning hole (determining hole) when the third wheel 133 is assembled.

  In the minute hand wheel 134, the large-diameter gear 134a has 60 teeth and the small-diameter gear 134b has 14 teeth, and the minute hand pipe 134p, in which the small-diameter gear 134b is integrally formed, is formed at the side surface. It is formed so as to have a substantially T-shape when viewed. One end portion of the minute hand pipe 134p is pivotally supported by the intermediate plate 113, and the other end side shaft portion is rotatably inserted into an hour hand pipe 136p of an hour hand wheel 136 described later. Further, the minute hand pipe 134p penetrates the lower case 111 and protrudes toward the dial 201 of the timepiece, and the minute hand 203 is attached to the tip thereof.

  Further, as shown in FIG. 20, the minute hand wheel 134 has three arc-shaped through holes that are long in the circumferential direction in a region overlapping with the second hand wheel 123, the first fifth wheel 122, and the third wheel 133 by rotation. 134c, 134d, and 134e are formed. The arc-shaped through-hole 134d and the arc-shaped through-hole 134d are formed with a central angle α5 that is separated by 30 °, and the arc-shaped through-hole 134d and the arc-shaped through-hole 134e are formed with a central angle α6 that is separated by 30 °. Further, the arc-shaped through hole 134e and the arc-shaped through hole 134c are formed at a central angle α7 and separated by 60 °. That is, the light-shielding portion A having the widest width is formed between the arc-shaped through hole 134e and the arc-shaped through hole 134c, and between the arc-shaped through hole 134c and the arc-shaped through hole 134d and between the arc-shaped through hole 134d and A light shielding part B narrower than the light shielding part A is formed between the arcuate through hole 134e.

  The arc-shaped through hole 134c is formed by a circular portion 134c 'on one end side, a wide arc portion 134c "extending from the other end side, and a narrow arc portion 134c"' connecting the two. The circular portion 134 c ′ defined by the narrow arc portion 134 c ″ ″ is used not only for passing detection light but also as a positioning hole (determining hole) when the minute hand wheel 134 is assembled.

  In the hour hand wheel 136, the number of teeth of the large-diameter gear 136a is 40, and a cylindrical hour hand pipe 136p is integrally attached at the center thereof, and the minute hand pipe 134p described above is provided inside the hour hand pipe 136p. Is inserted. The hour hand pipe 136p is inserted into a bearing hole 111a formed in the lower case 111 so as to be pivotally supported. Further, the tip end of the hour hand pipe 136p penetrates the lower case 111 and is connected to the timepiece dial 201 side. The hour hand 204 is attached to the tip.

  Further, as shown in FIG. 21, the hour hand wheel 136 includes three pieces that are long in the circumferential direction in a region overlapping with the second hand wheel 123, the first fifth wheel 122, the third wheel 133, and the minute hand wheel 134 by rotation. Arc-shaped through holes 136c, 136d, and 136e are formed. The arc-shaped through-hole 136c and the arc-shaped through-hole 136d are formed with a central angle α8 of 45 ° apart, and the arc-shaped through-hole 136d and the arc-shaped through-hole 136e are formed with a central angle α9 of 60 ° apart. In addition, the arc-shaped through hole 136e and the arc-shaped through hole 136c are formed with a central angle α10 and separated by 30 °, and the lengths of the arc-shaped through holes 136c, 136d, and 136e are the center angles β1 + β2, β3 and β4 are set to be 75 °, 60 °, and 90 °, respectively. That is, the narrowest light-shielding portion C is formed between the arc-shaped through-hole 136e and the arc-shaped through-hole 136c, and the light-shielding portion C is located between the arc-shaped through-hole 136c and the arc-shaped through-hole 136d. A wide light-shielding portion D is formed, and a light-shielding portion E wider than the light-shielding portion D is formed between the arc-shaped through hole 136d and the arc-shaped through-hole 136e.

  Further, the arc-shaped through hole 136c connects the circular portion 136c ′ positioned at 7.5 ° with the central angle β1 from one end side and the wide arc portion 136c ″ extending from the other end side, and connects the both. The narrow arc portion 136c ′ ″ located on both sides of the portion 136c ′ is formed. The circular portion 134 c ′ defined by the narrow arc portion 136 c ″ ″ is used not only for passing detection light but also as a positioning hole (determining hole) when the hour hand wheel 136 is assembled.

  The minute wheel 135 has 42 teeth for the large-diameter gear 135a and 10 teeth for the small-diameter gear 135b, and is pivotally supported with respect to the protrusion 111b formed on the lower case 111. The large-diameter gear 135a meshes with the small-diameter gear 134b formed on the minute hand pipe 134p, and the small-diameter gear 134b meshes with the hour hand wheel 136 (136a), and the rotation of the minute hand wheel 134 is decelerated and the hour hand It is transmitted to the car 136.

  As shown in FIG. 2, the light detection sensor 140 includes a light emitting element 142 made of a light emitting diode attached to a circuit board 141 fixed to the wall surface of the upper case 112, and a lower case so as to face the light emitting element 142. And a light receiving element 144 made of a phototransistor attached to a circuit board 143 fixed to the wall surface of 111.

  The anode of the light emitting element 142 is connected to the other end of the resistor R4 in the drive circuit 18 having one end connected to the collector of the transistor Q2, and the cathode is grounded and connected to the emitter of the light receiving element 144.

  The collector of the light receiving element 144 is connected to the control circuit 14. The connection line to this control circuit is an output line for the detection signal DT1 to the control circuit 14, and this output line is connected to the supply line of the power supply voltage VCC via the resistor R5.

  The emitter of the transistor Q2 of the drive circuit 18 is connected to the supply line of the power supply voltage VCC, and the base is connected to the output line of the drive signal DR2 via the resistor R3. That is, the light emitting element 142 is connected to the drive circuit 19 so as to emit light when the low level drive signal DR2 is output from the control circuit 14.

  As shown in FIG. 3, the first fifth wheel 122, second hand wheel 123, third wheel 133, minute hand wheel 134, and hour hand wheel 136 are all disposed at the same time in plan view. And the through-hole 122c of the 1st fifth wheel 122, the through-hole 133c of the third wheel 133, the through-hole 123c of the second hand wheel 123, the through-hole 134c (134d, 134e) of the minute hand wheel 134, and the through-hole of the hour hand wheel 136 When 136c (136d, 136e) overlaps, the detection light emitted from the light emitting element 142 is received by the light receiving element 144, and it is output that the second hand, the minute hand, and the hour hand indicate the position such as the hour. It has become.

  Further, the light emitting element 142 is disposed in a mounting recess 112c as a first layout portion formed so as to open to the outside of the upper case 112, and a circular through hole having a predetermined diameter is formed on the bottom surface of the mounting recess 112c. A hole 112d is formed. The circular through-hole 112d has a property that the detection light emitted from the light emitting element 142 spreads in a divergent shape, and therefore, it is possible to prevent erroneous detection by blocking only the light that has converged by blocking the light of the spread. It is to make.

  Similarly, the light receiving element 144 is disposed in an attachment recess 111c as a second arrangement portion formed so as to open to the outside of the lower case 111, and a circular shape having a predetermined diameter is formed on the bottom surface of the attachment recess 111c. A through hole 111d is opened. The circular through-hole 111d emits from the light-emitting element 142 and allows only light that has passed through the through-hole to pass as much as possible to prevent erroneous detection.

  When attaching the first fifth wheel 122, the third wheel 133, the second hand wheel 123, the minute hand wheel 134, and the hour hand wheel 136, a predetermined positioning pin is used as the circular through hole 111d of the lower case 111 and the positioning. The assembly is sequentially performed so as to penetrate the through hole and the circular through hole 112d of the upper case 112. After the upper case 112 and the lower case 111 are joined and integrated, the positioning pin is pulled out, the light emitting element 142 is attached to the attachment recess 112c where the through hole 112d is located, and the attachment recess where the through hole 111d is located The light receiving element 144 is attached to 112c.

  As a result, the through holes 112d and 111d are completely closed, and external light can be prevented from entering the internal space defined by the upper case 112 and the lower case 111. Therefore, it is possible to prevent erroneous detection due to the intrusion of external light, and since both the positioning hole at the time of assembly and the light detection through hole are combined, these holes are provided in comparison with the case where they are provided separately. Centralization and downsizing of the device can be performed.

  As shown in FIGS. 2 and 3, the manual correction system 150 includes a date wheel 135 that meshes with the small-diameter gear 134 b of the minute hand wheel 134 and the large-diameter gear 136 a of the hour hand wheel 136, and the reverse wheel 135 of this day. And a manual correction shaft 151 having a gear 151a meshing with the large-diameter gear 135a. The manual correction shaft 151 is positioned outside the upper case 112 and penetrates a head 151b that can be directly touched by a user and an opening 112e that extends from the head 151b and is formed in the upper case 112. It consists of a columnar portion 151c that is pivotally supported with respect to a protrusion 111e formed on the lower case 111, and a gear 151a is formed in a lower region of the columnar portion 151c.

  The manual correction shaft 151 is configured to rotate in the same phase as the minute hand wheel 134, and when the minute hand wheel 134 is driven by the above-described second drive system 130, the minute hand wheel 134 via the minute wheel 135. The pointer position can be manually corrected by rotating the head 151b with a finger when the second drive system 130 is not operated.

  As described above, since the second hand shaft 123b of the second hand wheel 123 is inserted into the minute hand pipe 134p of the minute hand wheel 134 and the minute hand pipe 134p of the minute hand wheel 134 is inserted into the hour hand pipe 136p of the hour hand wheel 136, the second hand wheel 123. The minute hand wheel 134 and the hour hand wheel 136 have the same rotation center axis, and when the time is displayed, the second hand rotates once every 60 seconds, the minute hand rotates once every 60 minutes, and the hour hand moves. Driven to rotate once every 12 hours.

  As shown in FIG. 22, a groove serving as a first index for positioning extending at a predetermined width in the radial direction is formed at the tip of the minute hand pipe 134p of the minute hand wheel 134 and the tip of the hour hand pipe 136p of the hour hand wheel 136. 134 g and a groove 136 g as a second index are formed. The groove 134g and the groove 136g are set so as to indicate a predetermined time, for example, 12:00 when aligned.

  By providing such a positioning index, even if the minute hand wheel 134 and the hour hand wheel 136 are surrounded by the lower case 111 and the upper case 112 and covered, the grooves 134g and 136g can be preliminarily aligned. Since it can be seen that it indicates the approximate time that has been set, the minute hand and hour hand can be easily attached based on that state, eliminating the need for other alignment and position confirmation processes. Manufacturing time and inspection time can be shortened. Note that the positioning index is not limited to the above groove, but may be a mark such as a potch.

  Next, the operation according to the above configuration will be described with reference to FIGS. 23, 24 and 25, focusing on the operations in the standard time radio signal and the standard radio signal reception system 11 and the control circuit 14 during forced reception.

  For example, when the reset / forced reception switch 12 is turned on by the user, the control circuit 14 returns the various states to the initial state and enters the forced correction mode (ST1).

  At this time, when the reset / forced reception switch 12 is turned on, for example, driving power is supplied from the control circuit 14 to the standard radio signal reception system 11 and a standard time radio signal reception operation is performed (ST2).

  Specifically, standard time radio signals having different frequencies (frequency 40 kHz or 60 kHz) are received by the receiving antenna 1101a of the standard radio signal receiving system 11. The tuning circuit 1101ba tunes the signal received by the receiving antenna unit to, for example, a frequency of 60 kHz when the standard time radio signal is a frequency of 60 kHz and a frequency of 40 kHz when the standard time radio signal is a frequency of 40 kHz.

  In the amplifier 1102, the standard time radio signal is amplified so as to have a constant amplitude and is input to the first crystal filter 1103 and the second crystal filter 1104.

  In the first crystal filter 1103, only the standard time radio signal with a frequency of 40 kHz is output from the standard time radio signal S 1102 input by the amplifier 1102. The second crystal filter 1104 outputs only the standard time radio signal with a frequency of 60 kHz from the standard time radio signal S1102 input by the amplifier 1102.

  The synthesizing unit 1105 synthesizes the standard time radio wave signals output from the first crystal filter 1103 and the second crystal filter 1104 and outputs the synthesized signal to the detection circuit 1106. In the detection circuit 1106, the synthesized standard time radio signal is detected by envelope detection, and the time code signal is demodulated. The time code is input from the detection circuit 1106 to the control circuit 14.

  If the reception state is within the reference range after the reception operation in step ST2 and the button correction mode is not set (ST3, ST4), the needle position is detected (ST5), and the hour hand is fast-forwarded for analog display. Correction is performed (ST6). In this fast-forward correction of the hands, the second hand stepping motor 121 and the hour / minute hand stepping motor 131 are rotationally driven in accordance with the value of the internal counter, and the hand position is corrected to the time position.

  As shown in FIG. 23, when the above-mentioned fast-forward correction of the pointer is completed and 1 second has elapsed (ST7), the control circuit 14 counts up the time counter (ST8), and the normal correction mode for normal hand movement is performed. (ST9).

  In the normal correction mode, if it is not the button correction mode (ST10), it is determined whether or not it is a preset reception time (ST11), and if it is the set time, a standard radio signal is received. (ST12). Since the reception operation of step 14 is performed in the same manner as the process of step ST2, detailed description thereof is omitted here.

  If reception is not possible in the reception operation of step ST12 (ST13), the process proceeds to step ST6. On the other hand, if reception is possible, the process proceeds to step ST7.

  In step ST3, when the correction mode switch 21 is turned on to shift to the button correction mode, a predetermined button correction operation is performed (ST14). Thereafter, the process proceeds to step ST7.

  The position detection of the pointer in step ST5 is performed as shown in FIG. 24, for example. That is, the drive signal DR2 is output from the control circuit 14 to the drive circuit 18 at a low level. As a result, the transistor Q2 is turned on, and detection light is emitted from the light emitting element 142, that is, the light emitting element (ST101).

  Subsequently, the control signal CTL1 is output, the second hand stepping motor 121 is pulse-driven (ST102), the light receiving element 144, that is, the phototransistor is turned on, and the detection signal DT1 is switched from the high level (power supply voltage VCC level) to the low level. A determination is made as to whether or not a change has been made (ST103).

  Here, when the detection signal DT1 from the phototransistor is held at a high level, the detection signal DT1 from the phototransistor is at a high level (power supply every time the number of pulses for performing step driving is added. It is determined whether or not the voltage Vcc level has been switched to a low level (ST104 to ST106).

  If the output of the detection signal DT1 from the phototransistor does not switch from the high level (power supply voltage VCC level) to the low level even when the number of pulses reaches 9, the hour / minute hand stepping motor 131 performs one step (pulse). When driven (ST102), the second hand wheel 123 is rotated.

  On the other hand, when it is determined in step ST103 that the detection signal DT1 from the phototransistor has been switched from the high level to the low level, the second hand wheel 123 is fast-forwarded (ST108), and the output pattern stored in advance in the control circuit 14 is detected. Comparison is performed (ST109).

  As a result of the comparison, if the obtained output pattern does not match the stored output pattern, the process returns to step ST108, and the second hand wheel 123 is fast-forwarded again.

  On the other hand, if the obtained output pattern matches the stored output pattern, the phototransistor is then transferred at that time (when the level of the detection signal DT1 is not switched to the low level by the phototransistor even at the fifth step). At the time when the output of the second hand wheel is switched to the low level), the output of the control signal CTL1 is stopped and the circuit drive of the second hand wheel 123 is stopped. Then, the second hand wheel 123 stops at the zero return position (ST110). At this time, the second hand is corrected to a position at a predetermined time, for example, on the hour (0 second).

  Subsequently, the control signal CTL2 is output from the control circuit 14, only the hour / minute hand stepping motor 131 is pulse-driven at a predetermined output frequency, and the minute hand wheel 134 is fast-forwarded (ST111).

  Then, the output pattern from the phototransistor is compared with the output pattern stored in advance in the control circuit 14 (ST112). As a result of the comparison, if the obtained output pattern does not match the stored output pattern, the process returns to step ST111 and the minute hand wheel 134 is fast-forwarded again.

  On the other hand, if the obtained output pattern matches the stored output pattern as a result of the comparison in step ST112, the output of the control signal CTL2 is stopped at that time, and the hour / minute hand stepping motor 131 is stopped. Thus, the driving of the minute hand wheel 134 and the hour hand wheel 136 is stopped (ST113).

  Here, the time correction by comparing the output pattern with a previously stored pattern is performed by matching with any of the three types of patterns.

  That is, as shown in FIG. 25A, the output pattern of the phototransistor by the minute hand wheel 134 has two narrow B portions and one wide A portion alternately as the off width where the light shielding portion acts. As shown in FIG. 25 (b), the output pattern of the phototransistor by the hour hand wheel 136 has three types of off-widths where the light-shielding portion acts, that is, D portion, E portion, and C portion. Is a pattern that appears alternately at a predetermined interval. As shown in FIG. 25C, the output pattern obtained by combining the two is a pattern in which the D part, the B part, and the A part are combined, and the E part, Three types of patterns, which are a combination of the B part and the A part and a pattern of the C part, the B part, and the A part, appear at predetermined intervals.

  In the pattern shown in FIG. 25, the portion of the pattern that is turned on is actually a portion that is turned off by the light-shielding portion of the third wheel & pinion 133, and is a tooth-missing pattern.

  Therefore, when a pattern consisting of a combination of D part, B part and A part is confirmed, for example, 4:00, for example, when a pattern consisting of a combination of E part, B part and A part is confirmed, for example, 8:00 If a pattern consisting of a combination of C part, B part, and A part is confirmed at 00 minutes, for example, it is set in advance as 12:00, for example, when one of these patterns is detected, By stopping the stepping motor 131, the minute hand wheel 134 and the hour hand wheel 136, that is, the minute hand 203 and the hour hand 204 can be adjusted to a predetermined time.

After the hour / minute hand stepping motor 131 is stopped, the drive signal DR2 by the control circuit 14 is switched to a high level.
Thereby, the transistor Q2 of the drive circuit 18 is turned off, the light emission of the light emitting element 142 is stopped (ST114), and the time adjustment operation is ended.

  Thus, in the correction operation of the pointer, since the arc-shaped through hole, that is, the long hole is used as the through hole for allowing the detection light to pass through the minute hand wheel 134 and the hour hand wheel 136, the light detection sensor 140 is turned on. As a result, the position detection time can be shortened, and as a result, the time for correcting the time of the second hand can be shortened. In addition, since the hour hand wheel 136 is provided with three kinds of light-shielding portions C, D, and E, the time can be adjusted by detecting any one of the three locations, and the hour hand wheel 136 having the slowest rotation speed is provided. The position can be detected only by rotating about 1/3 as compared with the prior art, and the time for correcting the time of the minute hand 203 and the hour hand 204 can be shortened.

  As described above, according to the present embodiment, a receiving antenna that receives a standard time radio signal and a standard time radio signal of a different frequency received by the receiving antenna are tuned to output a standard time radio signal of a desired frequency. And a tuning circuit. The tuning circuit includes a first inductor, a second inductor, first and second capacitors, and first and second nodes to which both terminals of the first inductor are connected, respectively. A first capacitor is connected between the first node and the second node, and a second inductor and a second capacitor connected in series are connected in parallel with the first inductor. The first node is connected between the first node and the second node, and the output node of the tuning circuit is formed by the first node.

  For this reason, this radio-controlled timepiece has an advantage that a reception frequency selection operation is not required with a simple circuit configuration without using a switching element. In addition, since the radio-controlled timepiece does not require a reception frequency selection operation even during reception of a standard time radio signal, the received signal can be processed immediately, and the load on the signal processing circuit can be reduced. Further, the radio-controlled timepiece can receive the standard time radio signal more accurately in an area where two different frequencies are mixed.

  As another embodiment, the standard radio wave signal receiving system 11 may not include the amplifier 1102. In this case, the tuning circuit 1101ba outputs the tuned standard time radio signal S1101b to the first crystal filter 1103 and the second crystal filter 1104.

  Further, in the present embodiment, the synthesis unit 1105 has a form in which the first crystal filter 1103 and the second crystal filter 1104 are simply connected and the standard time radio wave signal is added. However, the present invention is not limited to this form. is not. For example, you may subtract.

  Further, the tuning frequency according to the present embodiment is an example, and is not limited to 40 kHz or 60 kHz.

  Furthermore, the radio-controlled timepiece is not limited to the present embodiment, and any other appropriate and various modifications employing the tuning circuit according to the present invention are possible.

1 is a block configuration diagram showing a first embodiment of a signal processing system circuit of a radio-controlled timepiece according to the present embodiment. It is sectional drawing which shows the whole structure of 1st Embodiment of the pointer position detection apparatus of the radio wave correction timepiece concerning this embodiment. It is a top view of the principal part of the pointer position detection apparatus concerning this embodiment. It is a front view which shows the external appearance of the electromagnetic wave correction timepiece of FIG. It is a figure which shows the structure of the long wave receiving antenna system of 1st Embodiment of the electromagnetic wave correction timepiece of FIG. FIG. 2 is a circuit diagram illustrating a first configuration example of a tuning circuit according to the present embodiment. It is a circuit diagram which shows the 2nd structural example of the tuning circuit which concerns on this embodiment. It is a figure which shows an example of the frequency characteristic of the impedance in other embodiment of the tuning circuit which concerns on this embodiment. It is a circuit diagram which shows one structural example of the amplifier which concerns on this embodiment. It is a figure for demonstrating the discrimination | determination reference | standard of the receiving radio wave state before the zero return operation | movement of embodiment of initial correction mode embodiment in the control circuit which concerns on this embodiment. It is a figure which shows the signal pattern of a standard time electromagnetic wave. It is a figure which shows the carrier waveform and synthetic | combination waveform of a standard time electromagnetic wave. It is a figure which shows an example of the time code of a standard time radio signal. It is a top view which shows the 1st drive system which drives the second hand which is a part of automatic correction timepiece. It is a top view which shows the 2nd drive system which drives the minute hand and hour hand which are some automatic correction timepieces. It is a top view which shows the 1st 5th wheel which makes a part of 1st drive system which drives a second hand. It is a top view which shows the second hand wheel which makes a part of 1st drive system which drives a second hand. It is a top view which shows the other example of the second hand wheel which makes a part of 1st drive system which drives a second hand. It is a top view which shows the 3rd wheel which forms a part of 2nd drive system which drives a minute hand and an hour hand. It is a top view which shows the minute hand wheel which makes a part of 2nd drive system which drives a minute hand and an hour hand. It is a top view which shows the hour hand wheel which makes a part of 2nd drive system which drives a minute hand and an hour hand. It is an end view which shows the front-end | tip part of a minute hand pipe and an hour hand pipe. It is a flowchart for demonstrating operation | movement of the electromagnetic wave correction timepiece which concerns on this embodiment. It is a flowchart for demonstrating the pointer position correction operation | movement in the control circuit of the radio wave correction timepiece which concerns on this embodiment. It is a figure which shows the output pattern of the detection means by a minute hand wheel, an hour hand wheel, and the synthesis | combination of both in correction operation.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Signal processing system circuit, 11 ... Standard radio wave signal reception system, 12 ... Reset / forced reception switch, 13 ... Oscillation circuit, 14 ... Control circuit, 15, 18-19 ... Drive circuit, 16 ... Light emitting element, 17 ... Buffer Circuit: 20 ... Correction switch group, 21 ... Correction mode switch, 22 ... Display changeover switch, 23 ... Up switch, 24 ... Down switch, 30 ... Liquid crystal display panel, 100 ... Clock body, 201 ... Dial, 202 ... Second hand , 203 ... minute hand, 204 ... hour hand, 1101 ... long wave receiving antenna unit, 1101a ... receiving antenna, 1101b, 1101ba ... tuning circuit, 1102 ... amplifier, 1103 ... first crystal filter, 1104 ... second crystal filter, 1105 ... Combining unit, 1106 ... detection circuit, A to E ... light shielding unit, C1 to C3, C111 to C116 ... capacitor, a1 to Ca3 ... capacitance, CRY ... crystal oscillator, GND ... ground potential, L111 to L112 ... tuning coil, Ln1 to Ln2 ... inductance, ND1 to ND8 ... node, Q1 to Q2, Q11 ... transistor, R1 to R5, R111 to R114 ... resistance, VCC ... power supply potential, ωp1-ωp4 ... angular frequency, ωs1-ωs2 ... angular frequency.

Claims (4)

A radio-controlled timepiece that corrects the time of an internal clock based on standard time radio signals of different frequencies including the same time code transmitted from a plurality of base stations,
A receiving antenna for receiving the standard time radio signal;
A tuning circuit that tunes the standard time radio signal of the different frequency received by the receiving antenna and outputs the standard time radio signal of a desired frequency;
The tuning circuit is
A first inductor forming the receiving antenna;
A second inductor;
First and second capacitors;
A first node and a second node to which both terminals of the first inductor are respectively connected;
The first capacitor is connected between the first node and the second node;
In parallel with the first inductor, the second inductor and the second capacitor connected in series are connected between the first node and the second node,
The radio-controlled timepiece in which the output node of the tuning circuit is formed by the first node. The tuning circuit has a third capacitor,
The third capacitor is
The radio-controlled timepiece according to claim 1, wherein the radio-controlled timepiece is connected between the first node and a connection point of the second inductor and the second capacitor. A first filter unit that passes only the standard time radio signal of the first frequency from the standard time radio signal output by the tuning circuit;
A second filter unit that passes only the standard time radio signal of the second frequency from the standard time radio signal output by the tuning circuit;
A combining unit that combines the standard time radio signal of the first frequency that has passed through the first filter unit and the standard time radio signal of the second frequency that has passed through the second filter unit;
The radio wave according to claim 1, further comprising: a detection unit that detects a synthesized wave of the standard time radio signal output from the synthesis unit and outputs a time code included in the synthesized wave of the standard time radio signal. Correction clock. An amplifier circuit for amplifying the standard time radio signal output by the tuning circuit;
A first filter unit that passes only the standard time radio signal of the first frequency from the standard time radio signal output by the amplifier circuit;
A second filter unit that passes only the standard time radio signal of the second frequency from the standard time radio signal output by the amplifier circuit;
A combining unit that combines the standard time radio signal of the first frequency that has passed through the first filter unit and the standard time radio signal of the second frequency that has passed through the second filter unit;
The radio wave according to claim 1, further comprising: a detection unit that detects a synthesized wave of the standard time radio signal output from the synthesis unit and outputs a time code included in the synthesized wave of the standard time radio signal. Correction clock.

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