JP2005091227A - Radio-controlled watch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio-controlled watch capable of reducing current consumption on time correction. <P>SOLUTION: The radio-controlled watch is provided with an oscillation circuit 13 generating clock signals; an internal clock 1401 timing time information, based on a clock signal S13; a second hand driving system 120 and an hour and minute hand driving system 130 that perform time stamp; a standard radio-receiving system 11 receiving a standard time radio signal; and a control circuit 14 that produces a correction information D for correcting time information timed by the internal clock 1401, based on the standard time radio signal and the time information that the internal clock 1401 times, when receiving the standard time radio signal, corrects the time information that the internal clock 1401 times based on the correct message D to determine receipt timing, based on error information between the standard time radio signal that standard radio receiving system 11 receives and the time information that the internal clock 1401 times and is corrected based on the correct message D, and then performs time correction based on the standard time radio signal at the receipt timing. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to, for example, a radio-controlled timepiece that corrects time by correcting information at normal times and receives a standard time radio signal at a timing corresponding to an error caused by the time correction.

Conventionally, for example, an internal clock that measures the time based on an oscillation signal from a crystal oscillator, and periodically receives a standard time radio signal, and corrects the time information that the internal clock measures and the time of the display time. It has been known.
In addition, for example, a radio-controlled watch is known that changes the reception schedule, such as increasing the number of receptions when the reception status is poor and the standard time radio signal cannot be received properly, to prevent an increase in error due to the inability to receive. ing.

In recent years, for example, a correction value is calculated based on an error of a predetermined time interval between a standard time radio signal periodically received and time information measured by the internal clock, and the time measured by the internal clock based on the correction value is calculated. A radio-controlled timepiece that corrects information is known (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2003-4876

However, the above-mentioned radio-controlled timepiece requires a reception time of 1 to 3 minutes, usually about 5 minutes at the shortest, regardless of whether the standard time radio signal is received or not. Is relatively large.
Further, even when the standard time radio signal is properly received and the time error is small, the current consumption related to the time adjustment is not reduced.
Particularly in the case of a watch having a long battery life, a solar power generation type watch, a watch having a severe restriction on the current consumption, such as a watch, a watch with reduced current consumption is desired.

  By the way, the radio-controlled timepiece disclosed in Patent Document 1 periodically corrects the time based on the correction value. However, there is a small error that cannot be corrected only by the correction value due to an external environment such as a temperature change. Due to the accumulation of such minute errors, there is a problem that a large error occurs between the time information measured by the internal clock and the standard time in the long term.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a radio-controlled timepiece that can reduce current consumption related to time correction.

  Another object of the present invention is to provide a radio-controlled timepiece that can reduce an error from the standard time even when the time is corrected using a correction value.

  In order to achieve the above object, according to the radio-controlled timepiece of the present invention, a clock signal generating means for generating a clock signal, and an internal clock for measuring time information based on the clock signal generated by the clock signal generating means, A standard radio wave receiving means for receiving a standard time radio signal; the standard time radio signal received by the standard radio wave receiving means; and the time information measured by the internal clock when the standard time radio signal is received. In accordance with the correction information, the time information timed by the internal clock is corrected, the standard time signal received by the standard time signal receiving means, and the time information timed by the internal clock corrected based on the correction information Control means for correcting the time based on the standard time radio wave signal received by the standard radio wave receiving means at the reception timing based on the error information .

According to the radio-controlled timepiece of the present invention, the clock signal generating means generates a clock signal.
The internal timepiece measures time information based on the clock signal generated by the clock signal generation means.
The standard radio wave receiving means receives a standard time radio signal.
In the control means, the time information measured by the internal clock according to the standard time signal received by the standard time signal reception means and the correction information based on the time information measured by the internal clock when the standard time signal is received. The standard received by the standard radio wave receiving means at the reception timing based on the error information between the standard time radio wave signal corrected and received by the standard radio wave receiving means and the time information timed by the internal clock corrected based on the correction information The time is corrected based on the time signal.

  According to the present invention, it is possible to provide a radio-controlled timepiece that can reduce current consumption for time correction and can reduce an error from the standard time even when the time is corrected using a correction value. Can do.

The radio-controlled timepiece according to the embodiment of the present invention receives, for example, a standard time radio signal a predetermined number of times, calculates an error of time information measured by the internal clock at that time, and calculates correction information based on the error. The time information generated by the internal clock is corrected based on the correction information without generating the standard time radio signal.
The radio-controlled timepiece receives a standard time radio signal after a lapse of a predetermined time, obtains an error between the time information of the internal clock corrected based on the correction information and the standard time, determines the reception timing based on the error, Until the reception timing, the time is corrected based on the correction information. When the reception timing is reached, the standard time radio signal is received and the time is corrected and the correction information is corrected.

  Hereinafter, an embodiment of a radio-controlled timepiece according to the present invention will be described with reference to the drawings.

  FIG. 1 is an electrical functional block diagram of an embodiment of a radio-controlled timepiece according to the present invention. 2 is a configuration diagram of the radio wave correction timepiece shown in FIG. 1, and FIG. 3 is an enlarged view of a cross section of the radio wave correction timepiece shown in FIG.

  As shown in FIGS. 1, 2, and 3, the radio wave correction watch 1 according to the present embodiment includes a standard radio wave reception system 11, a time correction switch 12, an oscillation circuit 13, a control circuit 14, a drive circuit 15, a light emitting element 16, and a buffer. Circuit 17, drive circuit 18, temperature detection circuit 19, display 30, watch body 100, second hand motor 121, hour / minute hand motor 131, light detection sensor unit 140, manual correction system 150, transistors Q1 and Q2, and resistance element R1 ~ R4.

The oscillation circuit 13 corresponds to a clock signal generating unit according to the present invention, the standard radio wave receiving system 11 corresponds to a standard radio wave receiving unit according to the present invention, and the control circuit 14 corresponds to a control unit according to the present invention.
The drive circuit 15, the light emitting element 16, the buffer circuit 17, the drive circuit 18, the second hand motor 121, the hour / minute hand motor 131, the light detection sensor unit 140, and the manual correction system 150 correspond to display means according to the present invention.

  The display means is not limited to this embodiment. For example, the display unit may be a desired time display device such as a liquid crystal display device that performs time display under the control of the control circuit 14.

  The display 30 is a time display device such as a liquid crystal display device, and performs time display by the control circuit 14.

The standard radio wave receiving system 11 receives a standard radio wave (also called a standard time radio signal) including standard time information (also called a time code) transmitted from a standard radio wave transmitting station (not shown), for example, and performs predetermined processing to obtain a signal. It outputs to the control circuit 14 as S11.
The standard radio wave receiving system 11 includes, for example, an antenna ANT and a long wave radio wave receiving circuit (standard radio wave receiving circuit) 111.

  The long wave reception circuit 111 decodes a standard time radio signal input via, for example, the antenna ANT, and outputs the standard time signal to the control circuit 14 as a signal S11. Specifically, the long wave receiving circuit 111 includes, for example, an RF amplifier, a detection circuit, and a waveform shaping circuit (not shown), performs amplification processing, detection processing, waveform shaping processing, and the like, and outputs a standard time signal as a processing result as a signal S11. To do. The control circuit 14 corrects the time based on the signal S11.

  For example, the long wave reception circuit 111 receives the standard time radio signal reception on state or reception off based on the control signal CTL11 that is output from the control circuit 14 and controls the reception on state or reception off state of the standard time radio signal. Control the state.

Japanese standard radio waves are operated by the Communications Research Laboratory (CRL), a standard radio transmitter that transmits standard radio waves with a frequency of 40 kHz, and standard radio wave transmitters that transmit standard radio waves with a frequency of 60 kHz. A place is provided.
The standard radio wave received by the radio wave receiving system 11 is sent in a form as shown in FIG.

  Specifically, the time code is composed 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 sec. 1, 0 and P are 500 ms, 800 ms, and 200 ms, respectively. It has become. The modulation method is amplitude modulation with a maximum value of 100% and a minimum value of 10%.

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

  The signal S11 is composed of, for example, a high level corresponding to the first level and a low level corresponding to the second level. The control circuit 14 performs reception state evaluation processing based on the high level and the low level, the falling edge ed1 from the high level to the low level, and the rising edge ed2 from the low level to the high level. When the edges ed1 and ed2 are not distinguished, they are simply referred to as edges ed.

Next, transmission data of the long wave standard radio wave will be described.
FIG. 5 shows an example of the time code of the standard time radio signal. FIG. 5A shows a format other than 15/45 minutes, and FIG. 5B shows a format of 15 minutes and 45 minutes.
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.

  The time adjustment switch 12 is operated, for example, when adjusting the time, and outputs a signal S12 to the control circuit 14 in accordance with the operation. When the signal S12 is input from the time adjustment switch 12, the control circuit 14 corrects the time.

  The oscillation circuit 13 includes a crystal oscillator CRY and capacitors C2 and C3, and supplies a clock signal S13 having a predetermined frequency to the control circuit 14.

FIG. 6 is a diagram for explaining the temperature characteristics of the oscillation circuit 13 shown in FIG.
FIG. 6A is a diagram illustrating frequency characteristics of the oscillation circuit 13 near the standard temperature ZTc (for example, 24 ° C.). The horizontal axis indicates the temperature T (° C), and the vertical axis indicates the oscillation frequency f. FIG. 6B is a diagram showing the temperature characteristics of the crystal AT plate (AT cut) in the oscillation circuit 13.

For example, when a 32 kHz cut crystal resonator is provided inside the oscillation circuit 13, the oscillation circuit 13 generates a signal S 13 having a secondary temperature characteristic frequency centered on the standard temperature ZTc as shown in FIG.
For example, when an AT-cut quartz crystal AT plate is provided inside the oscillation circuit 13, a signal S13 having a third temperature characteristic frequency as shown in FIG. 6B is generated.
For example, in this embodiment, an oscillation circuit 13 having a temperature characteristic shown in FIG.

When the oscillation circuit 13 has the above-described temperature characteristics, for example, the internal clock 1401 measures time information based on the signal S13 generated by the oscillation circuit 13, and thus an error from the standard time occurs due to a temperature change. .
The error includes a factor due to variation unique to each crystal oscillator, a factor due to the temperature change described above, and the like.

The control circuit 14 includes, for example, an internal clock 1401 and a memory 1402.
The internal clock 1401 counts time information based on the clock signal S13.
The internal clock 1401 includes, for example, a year information counter, a month information counter, a day information counter, a day information counter, a time counter that measures time information, a minute counter that measures minute information, a second counter that measures second information, and the like.

The memory 1402 is used as a work space of the control circuit 14, for example. For example, the memory 1402 includes a RAM (Random Access Memory), a ROM (Read Only Memory), and the like.
The memory 1402 stores, for example, a program including a function for performing processing according to the present invention, correction information D, a correction time conversion table DC described later, and the like. For example, the control circuit 14 performs processing according to the present invention by executing a program. The control circuit 14 may execute the processing according to the present invention by hard wiring.

  The control circuit 14 initially includes year information, month information, day information, day information, time information, time information that the internal clock 1401 measures based on the standard time radio signal received by the standard radio signal receiving system 11. The minute information and the second information are corrected, and the display time is corrected based on the time information measured by the internal clock 1401.

  The control circuit 14 corrects the time information measured by the internal clock 1401 based on the standard time radio signal received by the standard radio signal receiving system 11 and the time information measured by the internal clock 1401 when the standard time radio signal is received. Correction information is generated for this purpose.

  More specifically, for example, the control circuit 14 causes the standard time signal reception system 11 to receive a standard time radio signal a plurality of times at the initial time, and calculates an error from time information measured by the internal clock 1401 when received. An average value of errors in unit time is calculated, and the value is generated as correction information D.

The control circuit 14 corrects the time information counted by the internal clock 1401 and the display time based on the generated correction information D for a predetermined period.
Further, the control circuit 14 determines the reception timing based on error information between the standard time radio signal received by the standard radio wave reception system 11 and the time information measured by the internal clock 1401 corrected based on the correction information D. When the determined reception timing is reached, the time correction and the correction information D are corrected based on the standard time radio signal received by the standard radio wave reception system 11.

FIG. 7 is a diagram for explaining a specific example of the operation of the control circuit 14 shown in FIG. The horizontal axis indicates time t, and the vertical axis indicates an error Ter with respect to time information measured by the internal clock 1401 with respect to the standard time TS. An example of the accumulated error H of the internal clock 1401 when the time is not corrected is also shown.
Here, for example, a case where the control circuit 14 performs time correction based on the correction information D every day will be described.

For example, as shown in detail in FIG. 7, the control circuit 14 generates the correction information D based on the standard time radio wave signal received by the standard radio wave receiving system 11 a plurality of times in advance before time T0.
At time T0, based on the standard radio signal, the error between the time information measured by the internal clock 1401 and the standard time is set to zero. The control circuit 14 sets the display time to the standard time as will be described later.

After a predetermined period from time T0, for example, one day later (time T1), for example, based on the correction information D, the time information that the internal clock 1401 measures in accordance with the clock signal S13 is corrected.
For example, when the correction information D indicates that the average time is delayed from the standard time by 1.00 seconds per day, the control circuit 14 uses the time information TN measured by the internal clock 1401 at the time T1 when one day has elapsed from the time T0. The time is adjusted to advance 1.00 seconds.

From time T1 to time T4, the control circuit 14 similarly corrects the time based on the correction information D.
The control circuit 14 corrects the time based on the correction information D after a predetermined period, for example, five days later (time T5), further receives the standard time radio signal, and results of the time correction based on the correction information D thus far And error information TE with respect to the standard time is calculated. Further, after the calculation, the control circuit 14 corrects the time information and display time that the internal clock 1401 measures at the standard time.

  Based on the error information TE, the control circuit 14 estimates a time (reception timing) at which the accumulated value of the error information TE when the time correction is continuously performed using the correction information D is a set value. Until the time, the time is continuously corrected by the correction information D.

  When the estimated reception timing is reached, the control circuit 14 causes the standard time radio wave reception system 11 to receive the standard time radio signal, and based on the standard time radio signal, corrects the time based on the correction information D thus far. Error information TE between the result and the standard time is calculated, and reception timing is similarly estimated.

  The control circuit 14 estimates, for example, the time when the error information TE is smaller than the error for one day, and the accumulated error reaches a predetermined value, for example, an error for one day. The time is corrected by the correction information D for 9 days, and the error information TE is calculated based on the standard time radio signal on the 10th day to correct the time and correct the correction information.

  If the error TE is equal to or greater than a preset value, the control circuit 14 determines that there has been some environmental change, for example, receives a standard radio signal at a predetermined time interval a plurality of times, and corrects the correction value D. Make corrections.

FIG. 8 is a diagram showing a specific example of the correction time conversion table stored in the memory 1402 of the radio-controlled timepiece shown in FIG.
For example, when the time correction is performed based on the correction information D, the control circuit 14 is preferably corrected in a plurality of times, for example, not at a time. By doing so, it is possible to reduce an unnatural operation of the hands at the time adjustment.
For example, the control circuit 14 uses the error per 24 hours calculated based on the error between the time information measured by the internal clock 1401 and the standard radio wave signal included in the standard radio wave as the correction amount. For example, the correction amount is calculated by the following formula (1).

[Equation 1]
Correction amount = error [(1/64) second is one unit] × 24 [H] / (elapsed time from the time when the previous standard radio wave was normally received to the current normal reception) [H] (1)

The correction time conversion table DC is a table that correlates the correction time and the number of corrections to be corrected by the internal clock 1401 within a predetermined time according to the correction amount. For example, the correction time is approximately average within 24 hours. Assigned and set.
In the correction time conversion table DC, the number of corrections is set to increase as the absolute value of the correction amount increases. That is, the larger the absolute value of the correction amount, the greater the number of correction times.

In the correction time conversion table DC, it is desirable that the correction time is set to be a predetermined interval. This is because the correction of the internal clock 1401 is not performed at a time, but is performed in small amounts by the number corresponding to the correction amount so as to be as average as possible within a predetermined time.
The control circuit 14 can determine whether it is the correction time based on the current time and the correction amount of the internal clock 1401 using the correction time conversion table DC.

  In the correction time conversion table DC, for example, as shown in FIG. 8, the horizontal row indicates the minute digits of the time to be corrected, and the vertical column indicates the hour digits of the time to be corrected. Specifically, in the correction time conversion table DC, when the correction amount is ± 1 with (1/64) second as a unit, the correction time is set at 14:00. When the correction amount 14a is ± 2, correction times are set at 14:00 and 2:00. Further, for example, when the correction amount 14a is ± 5, the correction time is 14:00, 2:00, 20:00, 8:00, 17:00, with predetermined intervals. Is set.

The conversion value is obtained from the time indicated by the control circuit 14 and the internal clock 1401 and the correction time conversion table DC.
The control circuit 14 compares the conversion numerical value obtained from the correction time conversion table DC and the current time of the internal clock 1401 with the absolute value of the correction amount when the following formula (2) is satisfied, that is, the correction amount. When the absolute value of the internal clock 1401 is equal to or greater than the converted numerical value, the correction time operation of the internal clock 1401 is performed.

[Equation 2]
Conversion value ≤ | Correction amount | (2)

  Specifically, for example, when the correction amount is +1, the control circuit 14 derives the converted numerical value 1 from the correction time conversion table DC when the time is 14:00, and is the same as the absolute value of the correction amount +1. Therefore, it is determined as the correction time. At 15:00, the converted numerical value 11 is derived from the correction time conversion table 14b, and since it is larger than the absolute value of the correction amount + 1, it is determined that it is not the correction time.

  Similarly, for example, when the correction amount is −2, when the time is 2:00, the control circuit 14 derives the conversion numerical value 2 from the correction time conversion table DC and calculates the absolute value of the correction amount −2. Therefore, the correction time is determined. Further, when the time comes to 14:00, the conversion numerical value 1 is derived from the correction time conversion table DC, and since it is smaller than the absolute value of the correction amount −2, it is determined that it is the correction time.

  When performing error correction, the control circuit 14 performs temperature detection based on oscillation signals generated by a plurality of oscillation circuits, for example, and corrects correction information D, correction of reception timing based on the temperature detection result, Temperature compensation of the clock signal S13 generated by the oscillation circuit 13 is performed.

  Specifically, the temperature detection circuit 19 performs temperature detection and outputs a signal S19 indicating the temperature detection result to the control circuit 14.

  FIG. 9 is a diagram for explaining a specific example of the temperature detection circuit of the radio-controlled timepiece shown in FIG. FIG. 9A is a functional block diagram of a CR oscillation circuit as a temperature detection circuit of the radio-controlled timepiece shown in FIG. FIG. 9B is a diagram showing an oscillation signal S19 of the CR oscillation circuit shown in FIG.

In the present embodiment, the temperature detection circuit 19 includes a thermistor R19, a capacitor C19, an inverter 191, and an inverter 192, for example, as shown in FIG.
The output terminals of the inverter 191 and the inverter 192 connected in series are connected to the control circuit 14. One end of the thermistor R 19 is connected between the inverter 191 and the inverter 192, and the other end of the thermistor R 19 is connected to the input terminal of the inverter 191. The capacitor C19 is connected between the other end of the thermistor R19 and the output terminal of the inverter 192.

  In the radio-controlled timepiece 1 according to the present embodiment, as described above, the clock signal S13 by the crystal oscillator CRY in the oscillation circuit 13 and the CR (Capacitance Resistance) oscillation for high-speed oscillation that is used, for example, at the time of a fast-forward operation of the pointer, etc. This CR oscillation circuit is used as a temperature detection circuit.

FIG. 10 is a diagram for explaining the temperature characteristic of the resistance value (resistance) of the thermistor shown in FIG.
For example, the thermistor R19 changes its resistance value (resistance) according to temperature. For example, as shown in FIG. 10, the thermistor R19 has a resistance value of 300Ω (ohms) at a temperature of 25 ° C., and a resistance value of 289.7Ω at a temperature of 26 ° C.
For example, the capacitor C19 has a capacitance that does not depend on temperature.

For example, as shown in FIG. 9B, the CR oscillation circuit 19 shown in FIG. 9A has an oscillation signal S19 having a predetermined period T determined by the resistance value (resistance) R of the thermistor R19 and the capacitance C of the capacitor C19. Is generated.
For example, the period T of the oscillation signal S19 of the CR oscillation circuit 19 shown in FIG. 9A is 2πRC, and the frequency f is 1 / (2πRC).
For example, the control circuit 14 measures the frequency f of the signal S19 input from the CR oscillation circuit 19, and calculates the resistance value (resistance) R of the thermistor R19 from the measurement result and the capacitance C of the capacitor C19 set in advance. Then, the temperature is detected based on the temperature characteristic correspondence table of the thermistor R19 shown in FIG.

  The control circuit 14 performs correction of the correction information D, correction of the reception timing, temperature compensation of the clock signal S13 generated by the oscillation circuit 13 and the like according to the temperature detection result.

  For example, the control circuit 14 performs error correction on the variation factors of the crystal oscillator by using the correction information D. The control circuit 14 corrects the error due to the temperature change based on the signal S19 indicating the temperature detection result of the temperature detection circuit 19.

Specifically, as processing for temperature compensation of the clock signal S13, the control circuit 14 determines that the temperature coefficient of the crystal oscillator, for example, a 32 kHz crystal, if the previous temperature detection result by the temperature detection circuit 19 is 24 ° C. Assuming that the secondary temperature coefficient is -0.04 ppm / ° C / ° C and the temperature is increased from 24 ° C to 31 ° C by 7 ° C, the temperature deviation obtained by multiplying the temperature coefficient by the square of the temperature difference is- 0.04 × 7 × 7 = −1.96 ppm. Using this result, the control circuit 14 calculates an error per day due to a temperature change.
For example, −1.96 × 86400/1000000 = −0.1693 seconds / day, which is a delay due to a temperature change.

  Based on the error per day, the control circuit 14 corrects the time error due to the temperature change by additionally correcting the correction information D based on the temperature difference from the corrected time point and the measurement interval.

  For example, it is preferable that the control circuit 14 uses an average value of the results of temperature detection multiple times at a set time interval, rather than using a single temperature detection result by the temperature detection circuit 19. For example, the control circuit 14 causes the temperature detection circuit 19 to perform temperature detection four times in 24 hours, and performs correction using the average value.

  The control circuit 14 performs a time correction operation at a preset time (set time) based on standard time information (also referred to as time information) timed by the internal clock 1401.

  When the control circuit 14 determines that the reception state of the standard time radio signal is good, the time measured by the internal clock 1401 based on the standard time radio signal received by the long wave reception circuit 111 via the antenna ANT. The information is corrected, and based on the time information timed by the internal clock 1401, the second hand drive system 120 and the hour / minute hand drive system 130 are driven to correct the display time by the hands.

Hereinafter, the function of the control circuit 14 will be described in more detail. For example, when the time adjustment switch 12 is operated in the initial state, the control circuit 14 performs the origin detection processing of the pointer wheel and outputs the drive signals CTL1 and CTL2 corresponding to the time information measured by the internal clock 1401. Then, the time is displayed using the hands.
The control circuit 14 performs the phase detection process of the hour / minute hand wheel and the second hand wheel, the origin search process of the second hand, the origin search process of the hour / minute hand, and detects the position of each hand wheel after a predetermined time. Set a guideline.

For example, the phase adjustment processing is performed by setting the hour / minute hands to a position where the light output from the light emitting element 142 passes through the light transmitting portion provided in the hour / minute hand wheel and the light transmitting portion provided in the second hand wheel. Drive the car and the second hand wheel.
In the second hand origin search process, the light output from the light emitting element 142 is received by the light receiving element 144 by the light shielding portion and the light transmitting portion provided in the second hand wheel, and the origin is searched based on the light on / off pattern. The
As will be described later, the hour / minute hand origin search process is a light on / off pattern in which the light output from the light emitting element 142 is received by the light receiving element 144 by the light shielding portion and the light transmitting portion provided in the hour / minute hand wheel. The position is searched based on.

  The control circuit 14 samples a standard time radio signal (for example, 32 Hz) for a predetermined time, for example, 8 seconds in this embodiment, and determines the reception state based on the sampling result.

  Specifically, the control circuit 14 performs sampling (eg, 32 Hz) of the signal S1130 input from the radio wave reception system 11, for example, detects the edge ed, and determines the reception state based on the presence / absence and number of the edge ed. .

  The control circuit 14 counts various counters of the internal clock 1401 based on the basic clock by the oscillation circuit 13 when the time can be set based on the standard radio time signal received at the set reception frequency. Take control.

  When the reception state is not within the reference range, the control circuit 14 outputs the drive signal DR1 to the drive circuit 15 without outputting the control signal CTL1, and causes the light emitting element 16 as the notification means to emit light to the user. Notify that the standard radio wave signal is hardly received.

  The control circuit 14 compares the time measured by the various time counters of the internal clock 1401 with the standard time information based on the standard time radio signal received by the radio wave reception system 11, and if an error has occurred. Corrects the time counter according to the error, inputs the pulse signal P for correction to the motor 131 as the control signal CTL2 according to the correction, performs fast-forward driving, etc., and corrects the time display by the pointer. Do.

Next, a specific configuration of the movement of the radio-controlled timepiece and the pointer position detection system will be described with reference to FIGS. 2 and 3 and FIGS.
As shown in FIGS. 3 and 4, the watch body 100 has a lower case 111, an upper case 112 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. An intermediate plate 113 is provided in a state of being connected to the case 111.

  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. A (second hand drive system) 120, a second drive system (hour / minute hand drive system) 130, a light detection sensor 140, a manual correction system 150, and the like are fixed or pivotally supported.

As shown in FIG. 2, the first drive system 120 includes a substantially U-shaped stator 121a, a drive coil 121b wound around one leg piece of the stator 121a, and a rotation between the other magnetic pole of the stator 121a. First stepping motor 121 configured by a freely arranged rotor 121c and a first fifth transmission gear (first detection gear) in which a large-diameter gear 122a meshes with a pinion 121d of the rotor 121c. A wheel 122 and a second hand wheel 123 as a second detection gear (first pointer wheel) meshed with the small gear 122b of the first fifth wheel 122 are configured.
Here, in the second hand stepping motor 121, the stator 121a is mounted and fixed on the intermediate plate 113, and the rotor 121c is pivotally supported by the intermediate plate 113 and the upper case 112. The output control signal CTL1 of the control circuit 14 is provided. The rotation direction, rotation angle, and rotation speed are controlled based on the above.

  The first fifth wheel 122 has 60 teeth on the large gear 122a and 15 teeth on the small gear 122b, and is rotatably supported by the intermediate plate 113 and the upper case 112. The large-diameter gear 122a meshes with the rotor 121c (pinion 121d) of the second hand stepping motor 121 to reduce the rotational speed of the rotor 121c to a predetermined speed. As shown in FIG. 11, the first fifth wheel & pinion 122 has three circular transparent holes arranged at equal intervals in the circumferential direction (center angle α1 is 120 °) in a region overlapping with the second hand wheel 123. A 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 this second hand shaft 123b is inserted inside a minute hand pipe 134p described later, and a second hand is attached to the tip thereof. As shown in FIG. 14, 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 123c 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. Accordingly, a sufficient distance between the cutout hole 123f and the positioning light-shielding portion 123d can be secured, so that the detection light does not circulate into the cutout hole 123f in the region of the positioning light-shielding portion 123d, and the positioning light-shielding portion 123d reliably Detection light can be blocked. That is, since the positioning light-shielding portion 123d is formed at a position away from the region 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 122. By using this for positioning, reliable positioning can be performed.

  In the second hand wheel 123, as shown in FIG. 14, instead of providing a plurality of (11) through holes 123c, as shown in FIG. 15, 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.

2, 3 and 12, 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. A second minute wheel 132 as an intermediate gear in which a large-diameter gear 132a is meshed with a pinion 131d of the rotor 131c and an hour / minute hand stepping motor 131 configured by a rotor 131c rotatably disposed between the other magnetic poles. A third transmission wheel 133 as a second transmission gear (a third detection gear) in which the large diameter gear 133a meshes with the small diameter gear 132b of the second fifth wheel 132, and the small diameter gear 133b of the third wheel 133. The minute hand wheel 134 as a fourth detection gear (second pointer wheel) meshed with the large diameter gear 134 a and the small diameter gear 134 b of the minute hand wheel 134 are engaged with the large diameter gear 135 a. It was a minute wheel 135 of the day as 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. The rotation direction, rotation angle, and rotation speed are controlled based on the above.

  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 131d) 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 133a has 60 teeth and the small-diameter gear 133b has ten teeth. One end of the shaft portion is pivotally supported by the upper case 112, and the other end side is the middle 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. 16, 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. This through-hole 133c 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 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 face of the timepiece, and a minute hand is attached to the tip thereof.

  In addition, as shown in FIG. 17, 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 134c and the arc-shaped through-hole 134d are formed with a center angle α5 separated by 30 °, and the arc-shaped through-hole 134d and the arc-shaped through-hole 134e are formed with a center angle α6 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 134c1 on one end side, a wide arc portion 134c2 extending from the other end side, and a narrow arc portion 134c3 connecting the two. The circular portion 134c1 defined by the narrow circular arc portion 134c3 is used not only for passing the detection light but also as a positioning hole (determining hole) when the minute hand wheel 134 is assembled.

  The hour hand wheel 136 has a large gear 136a having 40 teeth, and a cylindrical hour hand pipe 136p is integrally attached to the center of the hour hand wheel 136a. The minute hand pipe 134p is disposed inside the hour hand pipe 136p. It is inserted. The hour hand pipe 136p is inserted into a bearing hole 111a formed in the lower case 111 and pivotally supported. The tip of the hour hand pipe 136p penetrates the lower case 111 to the dial face of the watch. It protrudes and has an hour hand attached to its tip.

  In addition, as shown in FIG. 18, 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. Further, the arc-shaped through hole 136e and the arc-shaped through hole 136c are formed at a central angle α10 and separated by 30 °, and the arc-shaped through holes 136c, 136d, and 136e have a length of the central angle 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.

  In addition, the arc-shaped through hole 136c connects the circular portion 136c1 located at a center angle β1 of 7.5 ° from one end side and the wide arc portion 136c2 extending from the other end side, and connects the both. It is formed by a narrow arc portion 136c3 located on both sides. The circular portion 136c1 defined by the narrow arc portion 136c3 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 135b meshes with the hour hand wheel 136 (136a) to decelerate the rotation of the minute hand wheel 134 and to set the hour hand It is transmitted to the car 136.

As shown in FIG. 3, 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 resistance element R4 in the drive circuit 18 having one end connected to the collector of the pnp transistor Q2, and the cathode is grounded and connected to the emitter of the light receiving element 144. Yes.
The collector of the light receiving element 144 is connected to the control circuit 14. The connection line with the control circuit 14 is an output line to the control circuit 14 for the detection signal DT1.
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 resistance element R3.
That is, the light emitting element 142 is connected to the drive circuit 18 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 an attachment recess 112c as a first arrangement 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 attachment 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, compared to the case where these holes 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. When the second drive system 130 is not operated, the pointer position can be manually corrected by rotating the head 151b with a finger.

  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. 19, 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.

FIG. 20 is a flowchart showing the operation of the hand position detection process of the radio-controlled timepiece shown in FIG.
The control circuit 14 drives the pointer driving system to detect the reference position of the pointer wheel based on the detection processing of the reference position detecting means, and then receives the standard received by the ferrite bar antenna 1101 and the long wave receiving circuit 1130 of the radio wave receiving system 11. The time measured by the internal clock 1401 is corrected based on the time signal, and the position of the pointer wheel is set based on the time measured by the internal clock 1401.
The pointer position detection process will be described with reference to FIG.

  An hour / minute pulse signal output pattern is set from the control circuit 14 (ST101), and the drive signal DR2 is output to the drive circuit 18 at a low level. Accordingly, the transistor Q2 is turned on, and detection light is emitted from the light emitting element 142, that is, the light emitting diode.

  Subsequently, the control signal CTL1 is output from the control circuit 14, 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 changed from the high level (power supply voltage Vcc level). It is determined whether or not the low level has been switched (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 is added to perform step driving. 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 is driven by one step (pulse). Then, the second hand stepping motor 121 is step-driven again (ST102), and the second hand wheel 123 is rotationally driven.

On the other hand, when it is determined in step ST103 that the detection signal DT1 from the phototransistor has switched from the high level to the low level, the second hand wheel 123 is fast-forwarded (ST108), and the comparison with the output pattern stored in advance in the control circuit 14 is performed. 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 output of the phototransistor is then output 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 of switching to low level), the output of the control signal CTL1 is stopped, and the circuit driving 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, the hour (0 second), and the second hand origin searching process ends.

  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. Then, the driving of the minute hand wheel 134 and the hour hand wheel 136 is stopped (ST113).

  Here, the position detection processing of the hour / minute hand wheel by comparing the output pattern with the output pattern stored in advance is performed by matching with any of the three types of patterns.

FIG. 21 is a diagram for explaining an output pattern of detection light of the radio-controlled timepiece shown in FIG.
In other words, as shown in FIG. 21A, 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. In addition, the output pattern of the phototransistor by the hour hand 136 is, as shown in FIG. 21 (b), there are three types of off-widths for which the light-shielding portion acts: D portion, E portion, and C portion. Is a pattern that appears alternately at a predetermined interval. As shown in FIG. 21C, the output pattern obtained by combining the two is a pattern in which the D portion, the B portion, and the A portion are combined, and the E portion, 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. 21, the portion of the pattern that is turned on is actually a portion that is turned off by the light blocking portion of the third wheel & pinion 133, and is a tooth-missing pattern.

  Further, for example, the reference positions of the minute hand wheel 134 and the hour hand wheel 136 are set at positions of 0:00, 4:00, and 8:00 as shown in FIG.

  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 part C, part B and part A is confirmed, for example, it is set in advance as 12:00, for example, when one of these patterns is detected, an hour / minute hand stepping motor By stopping 131, the minute hand wheel 134 and hour hand wheel 136, that is, the minute hand and hour hand can be adjusted to a predetermined time.

Then, 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 diode is stopped (ST114), and the time adjustment operation is ended.

Further, a case where the shipping position TS is set such that the origin search process of the hour / minute hand wheel is shortened in the sword attachment mode, that is, 10:30 in this embodiment, will be described with reference to FIG.
For example, when the user turns on the external power supply 201, the control circuit 14 performs phase alignment processing, second hand origin search processing, minute hand origin search processing, and time adjustment processing. When the shipping position TS is set to 10:30, as shown in FIG. 21, the second hand wheel and the hour / minute hand wheel are driven from the shipping position TS to penetrate the detection light, and then the hour / minute hand is stopped and the second hand origin point is set. Perform a search. After that, by rotating the hour and minute hands wheel, by detecting the C part with the optical sensor part 140, it is detected that the position is approximately 12 o'clock, and by stopping when the B part and the A part are detected, The minute hand is set at a predetermined reference position 12:00.

  For example, the 10:30 position is a position where a necessary and necessary on / off pattern to be referred to is detected when the origin search process is performed when the hour / minute hand wheel is set to the reference position. By setting a shipping guideline at this position, the origin search time is the shortest.

  FIG. 22 is a flowchart for explaining a specific example of the overall operation of the radio-controlled timepiece shown in FIG. With reference to FIG. 22 and the like, the overall operation of the radio-controlled timepiece 1 will be described focusing on the operation of the control circuit 14.

In step ST1, the control circuit 14 performs initial setting of parameters and the like.
In step ST2, the control circuit 14 outputs a control signal CTL11 for controlling the reception on state. When the standard radio wave receiving system 11 receives the control signal CTL11, the standard radio wave receiving system 11 receives the standard time radio wave signal via the antenna ANT and outputs it to the control circuit 14 as the signal S11.
The control circuit 14 corrects the time information measured by the internal clock 1401 based on the signal S11, drives the second hand drive system 120 and the hour / minute hand drive system 130 as time display means, and corrects the display time by the hands. .

  In step ST3, the control circuit 14 drives the time information by the internal clock 1401 and the second hand drive system 120 and the hour / minute hand drive system 130 based on the clock signal S13 generated by the oscillation circuit 13, and displays the time indicated by the hands. Update.

In step ST4, the control circuit 14 causes the standard radio wave receiving system 11 to receive the standard time radio signal as described above after a predetermined time has elapsed, for example, after several hours.
In step ST5, the control circuit 14 calculates error information between the standard time and the time information based on the standard time based on the standard time radio signal and the time information measured by the internal clock 1401 when the standard time radio signal is received. .
For example, the control circuit 14 calculates a correction amount per unit time from the calculated error information, and generates the correction information D.

In order to increase the accuracy of the correction information D, it is preferable to generate the correction information D based on a long-time average error by receiving the standard time radio signal multiple times.
In step ST6, the control circuit 14 determines whether or not the standard time radio signal has been normally received a set number of times, for example, a plurality of times, specifically three or four times. The process returns to ST3.
On the other hand, if it is determined in step ST6 that the set number of times and the standard radio signal have been normally received, the control circuit 14 uses the clock signal S13 generated by the oscillation circuit 13 to generate time information by the internal clock 1401. Then, the second hand drive system 120 and the hour / minute hand drive system 130 are driven to update the display time by the hands (ST7).

  In step ST <b> 8, the control circuit 14 determines whether it is time to correct time information measured by the internal clock 1401 based on the correction information D, for example. For example, specifically, the correction timing is calculated based on the correction information D and the correction time conversion table DC shown in FIG. 8, and it is determined whether or not the calculated correction timing is reached. If it is determined that it is not the correction timing, the process proceeds to step ST10.

  On the other hand, if it is determined in step ST8 that the correction timing is reached, the control circuit 14 corrects (corrects) the time information measured by the internal clock 1401 based on the correction information D (ST9). The process proceeds to ST10.

In step ST10, the control circuit 14 determines whether or not it is a reception timing for receiving the standard time radio signal. In the initial case, the reception timing is set after a preset period, for example, a few days after the last reception of the standard time radio signal. Further, as will be described later, the control circuit 14 estimates the time when the accumulated value of the error information becomes the set value, and determines the reception timing based on the estimated time.
When it is determined that it is not the reception timing, the control circuit 14 returns to the process of step ST7.

  On the other hand, if it is determined at step ST10 that the reception timing is reached, the control circuit 14 outputs a control signal CTL11 for controlling the tree reception on state to the standard radio wave reception system 11 to receive the standard radio signal. . When receiving the control signal CTL11, the standard radio wave receiving system 11 outputs the standard time radio signal received via the antenna ANT to the control circuit 14 as a signal S11 (ST11).

  In step ST12, the control circuit 14 generates error information between the standard time radio signal received by the standard radio wave receiving means and the time information measured by the internal clock 1401 modified based on the correction information D.

In step ST13, when the error information is smaller than a preset threshold value, for example, 0.5 seconds, the control circuit 14 estimates the time when the accumulated value of the error information becomes the set value, and the estimated time The reception timing is determined based on (ST14), the time is corrected based on the received standard time radio signal (ST15), and the process returns to step ST7.
Further, the control circuit 14 corrects the time information measured by the internal clock 1401 based on the correction information D until the determined reception timing.

  Specifically, as described above, in the control circuit 14, for example, the error information TE is a smaller value than the error for one day, and the accumulation of the error information reaches a predetermined value, for example, an error for one day. The time is estimated, for example, if it is 10 days, the time is corrected with the correction information D for 9 days, error information is calculated based on the standard time radio signal on the 10th day, time correction, correction information correction, etc. Do.

On the other hand, if it is determined in step ST13 that the error information is greater than or equal to the threshold value, the control circuit 14 determines that the correction information D is not functioning normally due to a change in the environment, and determines the correction information D. Correct (ST16).
For example, as described above, the correction information D is corrected based on error information with respect to the time information received by the internal clock 1401 by receiving the standard time radio signal multiple times at predetermined intervals.
The control circuit 14 corrects the time information of the internal clock 1401 based on the received standard time radio signal, and corrects the display time. The process returns to step ST17.

  As described above, the oscillation circuit 13 that generates the clock signal S13, the internal clock 1401 that measures time information based on the clock signal S13 generated by the oscillation circuit 13, the second hand drive system 120 that displays the time, and the hour The minute hand drive system 130, the standard radio wave reception system 11 that receives the standard time radio signal, the standard time radio signal received by the standard radio wave reception system 11, and the time measured by the internal clock 1401 when the standard time radio signal is received The correction information D for correcting the time information timed by the internal clock 1401 is generated based on the information, the time information timed by the internal clock 1401 is corrected based on the generated correction information D, and the standard radio wave receiving system 11 Received based on error information between the received standard time radio signal and time information timed by the internal clock 1401 modified based on the correction information D Since the control circuit 14 for correcting the time based on the standard time radio signal received by the standard radio wave reception system 11 when the determined reception timing is reached is provided, the number of times of reception of the standard time radio signal is provided. Can be reduced, and current consumption related to time correction can be reduced.

  Even when the time is corrected by the correction value, the standard time radio signal is received and the time is corrected at the reception timing determined as described above, so that an error from the standard time can be reduced.

  Further, the control circuit estimates the time when the accumulated value of the error information becomes the set value, determines the reception timing based on the estimated time, and the internal clock 1401 based on the correction information D until the determined reception timing. Since the time information timed by is corrected, the number of receptions can be reduced and the current consumption can be reduced as compared with the case of periodically receiving the standard time radio signal.

  The control circuit 14 also determines that the time information measured by the internal clock 1401 corrected based on the correction information D and the error information based on the standard time radio signal received at the reception timing are greater than a preset threshold value. Since the correction information D is corrected based on the standard time radio signal, even when the external environment or the like changes, the correction information D can be corrected to correct the time with high accuracy.

  FIG. 23 is a flowchart for explaining a specific example of the operation of the radio-controlled timepiece shown in FIG. With reference to FIG. 23, only the differences from the process shown in FIG.

  The processing from step ST1 to step ST12, step ST14, and step ST15 is the same as the processing shown in FIG.

  In step ST13, when it is determined that the error information is a preset threshold value, for example, 0.5 seconds or more, the control circuit 14 determines, for example, a predetermined value based on the temperature detection result of the temperature detection circuit 19. It is determined whether or not there has been a temperature change equal to or greater than a threshold value (ST20).

  When it is determined that the temperature change is smaller than the threshold value, the control circuit 14 corrects the correction information D as described above (ST16), corrects the time based on the standard time radio signal (ST17), and step The process returns to ST7.

On the other hand, in the determination of step ST20, when it is determined that there has been a temperature change equal to or greater than the threshold value based on the temperature detection result of the temperature detection circuit 19, the control circuit 14 based on the temperature detection result. Compensates the temperature of the clock signal S13 generated by (ST21).
Further, since the frequency of the clock signal S13 has changed due to temperature compensation, the control circuit 14 corrects the correction information D (ST23). The correction information D is corrected based on, for example, a standard time radio signal received a plurality of times at predetermined time intervals as described above.
The control circuit 14 also corrects the reception timing (ST24), and returns to the process of step ST7. As the reception timing, for example, correction such as setting to the initial reception timing is performed.

  As described above, in this specific example, since any one of the reception timing, the correction information D, and the clock signal S13 generated by the oscillation circuit 13 is corrected based on the temperature detection result by the temperature detection circuit 19, the temperature change High-accuracy time correction according to the time can be performed.

Further, for example, as the temperature detection circuit 19, a CR oscillation circuit that generates an oscillation signal having a frequency corresponding to the temperature is provided, and the control circuit 14 performs temperature detection based on the frequency of the oscillation signal generated by the CR oscillation circuit. Can detect temperature changes easily.
Further, since the CR oscillation circuit normally used for high-speed oscillation is used as the temperature detection circuit 19, it is not necessary to provide a new oscillation circuit, and the apparatus can be miniaturized.

FIG. 24 is a functional block diagram showing a specific example of the temperature detection circuit of the radio-controlled timepiece shown in FIG. FIG. 25 is a more detailed functional block diagram of the temperature detection circuit shown in FIG.
The temperature detection circuit 19a according to this specific example includes a CR time constant circuit 195 and a constant voltage power supply circuit 196.
The CR time constant circuit 195 performs charge / discharge with a time constant corresponding to the temperature, for example, and outputs the detection result to the control circuit 14.
The constant voltage power supply circuit 196 is a power supply circuit that supplies a constant voltage to the CR time constant circuit 195.

For example, as specifically shown in FIG. 25, the CR time constant circuit 195 includes a resistor R1951, a capacitor C1951, a switch SW1951, and a comparator 1952.
The switch SW1951, the register R1951, and the comparator 1952 are connected in series, and the output terminal of the comparator is connected to the control circuit 14. One end of a capacitor C1951 is connected between the resistor R1951 and the comparator 1952, and the other end of the capacitor C1951 is connected to the switch SW1951 through the constant voltage power supply circuit 196.

The switch SW1951 can control a conduction state or a non-conduction state between the constant voltage power supply circuit 196 and the register 1951 under the control of the control circuit 14, for example.
The resistor R1951 is a thermistor having a resistance value (resistance) R corresponding to temperature, for example.
The capacitor C1951 has a capacitance C having a predetermined value, for example.
For example, the comparator 1952 compares a preset value with the voltage of the CR circuit formed by the resistor R1951 and the capacitor C1951, and outputs a signal corresponding to the comparison result to the control circuit 14.
The time constant related to charging / discharging of the CR circuit is determined according to the temperature.

When performing temperature detection, the control circuit 14 sets the switch SW1951 to a conductive state, for example, causes the capacitor C1951 to start charging, and the voltage of the node N1951 between the register 1951 and the capacitor C1951 is set by the charging. When the value is reached, a signal S1952 is output. The control circuit 14 measures the time when the voltage of the node N1951 becomes the set value from the time when the switch SW1951 is set to the conductive state, and calculates the time constant of the CR circuit from the measurement result.
Since the capacitance C of the capacitor C1951 is substantially constant, the control circuit 14 calculates the resistance R of the register R1951 based on the calculated time constant and the capacitance C.
The control circuit 14 detects the temperature based on the calculated resistance R and the temperature characteristic of the resistance as shown in FIG. 10, for example. The control circuit 14 performs this temperature detection a plurality of times to detect a temperature change, and corrects any of reception timing, correction information, and the clock signal S13 generated by the oscillation circuit 13 based on the detection result.

In addition, the control circuit 14 may detect the temperature by detecting a time constant when the CR circuit is discharged.
For example, specifically, the control circuit 14 discharges the charge of the capacitor C1951 by controlling the switch SW to the non-conducting state from the state where the capacitor C1951 is sufficiently charged, and the comparator 1952 causes the node N1951 to A time constant is calculated based on the time until a predetermined value is detected as the voltage, and the temperature is detected as described above based on the calculated time constant.

  As described above, in this specific example, the temperature detection circuit includes the resistor R1951 and the capacitor C1951, and the CR time constant circuit 19a that charges or discharges with a time constant corresponding to the temperature, and the CR time constant circuit 19a. The temperature is detected based on the time constant of the voltage change during charging or discharging, and the control circuit 14 corrects any of the reception timing, the correction information, and the signal S13 generated by the oscillation circuit 13 based on the temperature detection result. Therefore, the temperature can be detected with simple components, and the reception timing of the standard radio signal, the correction information, the signal S13 generated by the oscillation circuit 13 and the like can be corrected.

Note that the present invention is not limited to the present embodiment, and various suitable modifications can be made.
In the present embodiment, the temperature detection is performed by using a resistor having temperature characteristics and a CR oscillation circuit or a CR time constant circuit including a capacitor as the temperature detection circuit, but the present invention is not limited to this form.
For example, the temperature may be detected by a CR oscillation circuit or a CR time constant circuit constituted by a capacitor and a resistor having temperature characteristics.
Alternatively, a voltage measurement circuit that measures the voltage of the resistance value (resistance) of the resistor may be provided, the resistance may be detected based on the measurement result, and the temperature detection may be detected from the value.

  In addition, even when the internal clock measures the time information based on the clock signal from the crystal oscillator with a relatively large temperature error, the temperature compensation of the clock signal is based on the temperature detection result by the temperature detection circuit. In addition, by performing time correction using the correction information D, current consumption is small, and the time can be adjusted with high accuracy.

FIG. 26 is a diagram illustrating a specific example of temperature history information of a temperature detection result by the temperature detection circuit. The horizontal axis represents time t (sec), and the vertical axis represents temperature T (° C).
Further, for example, as shown in FIG. 26, the control circuit 14 stores the temperature detection result by the temperature detection circuit 19 as temperature history information in association with the time information at the time of measurement, and based on the tendency of the temperature change. Any one of the reception timing, the correction information, and the clock signal S13 generated by the oscillation circuit 13 may be corrected.
By doing this, for example, at the turn of the season such as spring, summer, autumn and winter, the tendency of the temperature change is predicted and any one of the reception timing, the correction information, and the clock signal S13 generated by the oscillation circuit 13 is corrected. Thus, the time can be corrected with higher accuracy.

It is an electrical functional block diagram of one embodiment of a radio wave correction timepiece according to the present invention. It is a block diagram of the radio wave correction timepiece shown in FIG. FIG. 3 is an enlarged view of a cross section of the radio-controlled timepiece shown in FIG. 2. It is a figure for demonstrating the electromagnetic wave reception state in the control circuit which concerns on this invention. An example of a time code of a standard time radio signal is shown. (A) shows formats other than 15 and 45 minutes per hour, and (b) shows formats for 15 minutes and 45 minutes per hour. It is a figure for demonstrating the temperature characteristic of the oscillation circuit 13 shown in FIG. (A) is a figure which shows the frequency characteristic near standard temperature ZTc (for example, 24 degreeC) of the oscillation circuit 13. FIG. FIG. 6B is a diagram showing temperature characteristics of a crystal AT plate (AT cut) in the oscillation circuit 13. It is a figure for demonstrating one specific example of operation | movement of the control circuit 14 shown in FIG. It is a figure which shows one specific example of the correction | amendment time conversion table memorize | stored in the memory 1402 of the electromagnetic wave correction clock shown in FIG. It is a figure for demonstrating one specific example of the temperature detection circuit of the radio correction timepiece shown in FIG. (A) is a functional block diagram of a CR oscillation circuit as a temperature detection circuit of the radio-controlled timepiece shown in FIG. (B) is a diagram showing an oscillation signal S19 of the CR oscillation circuit shown in (a). It is a figure for demonstrating the temperature characteristic of the resistance value (resistance) of the thermistor shown in FIG. It is a top view which shows the 1st drive system which drives the minute hand and second hand which are a part of radio wave correction timepiece. It is a top view which shows the 2nd drive system which drives the minute hand and hour hand which are a part of radio wave 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 which shows the operation | movement of the pointer position detection process of the radio wave correction watch shown in FIG. It is a figure for demonstrating the output pattern of the detection light of the radio-controlled timepiece shown in FIG. 2 is a flowchart for explaining the overall operation of the radio-controlled timepiece shown in FIG. 3 is a flowchart for explaining a specific example of the operation of the radio-controlled timepiece shown in FIG. FIG. 2 is a functional block diagram illustrating a specific example of a temperature detection circuit of the radio correction timepiece illustrated in FIG. 1. FIG. 25 is a more detailed functional block diagram of the temperature detection circuit shown in FIG. 24. It is a figure which shows one specific example of the temperature history information of the temperature detection result by a temperature detection circuit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Radio wave correction clock, 11 ... Standard radio wave reception system, 12 ... Time correction switch, 13 ... Oscillation circuit, 14 ... Control circuit, 15 ... Drive circuit, 16 ... Light emitting element, 17 ... Buffer circuit, 18 ... Drive circuit, 19 ... Temperature detection circuit (CR circuit), 30 ... Display, 100 ... Timepiece body (mechanical mechanism: movement), 111 ... Lower case, 112 ... Upper case, 113 ... Medium plate, 120 ... First drive system (second hand drive system) , 121 ... Second hand motor (first drive source), 122 ... First fifth wheel (first transmission gear, first detection gear), 123 ... Second hand wheel (second detection gear, first pointer wheel) , 126 ... 6th car, 127 ... 7th car, 130 ... Second drive system (hour / minute hand drive system), 131 ... Hour / minute hand motor (second drive source), 132 ... 2nd fifth car, 133 ... No. 3 car, 134 ... Minute hand wheel (second pointer wheel), 1 5 ... minute wheel, 136 ... hour hand wheel (second pointer wheel), 140 ... light detection sensor, 142 ... light emitting element, 143 ... circuit board, 144 ... light receiving element, 150 ... manual correction system, 151 ... manual correction shaft 1401 ... Internal clock, 1402 ... Memory.

Claims (7)

Clock signal generating means for generating a clock signal;
An internal clock that measures time information based on the clock signal generated by the clock signal generating means;
A standard radio wave receiving means for receiving a standard time radio signal;
The time measured by the internal clock according to the standard time radio signal received by the standard radio wave receiving means and the correction information based on the time information measured by the internal clock when the standard time radio signal is received. The standard radio wave is received at a reception timing based on error information between the standard time radio signal received by the standard radio wave receiving means and the time information timed by the internal clock corrected based on the correction information. A radio-controlled timepiece having control means for correcting the time based on a standard time radio signal received by the receiving means. The control means determines the reception timing based on a time estimated from the accumulated value of the error information, and corrects time information measured by the internal clock based on the correction information until the reception timing. 1. An electric wave correction watch according to 1. When the time information measured by the internal clock modified based on the correction information and the error information by the standard time radio signal received at the reception timing are larger than a preset threshold value, the control means The radio wave correction timepiece according to claim 1, wherein the correction information is corrected based on the standard time radio wave signal. Having temperature detecting means for detecting temperature;
The control unit corrects any one of the reception timing, the correction information, and the clock signal generated by the clock signal generation unit based on a temperature detection result by the temperature detection unit. The radio-controlled clock described in 1. 5. The radio-controlled timepiece according to claim 4, wherein the temperature detection unit includes an oscillation circuit that generates an oscillation signal at a frequency corresponding to a temperature, and performs the temperature detection based on a frequency of the oscillation signal generated by the oscillation circuit. The temperature detection means includes a charge / discharge circuit that charges or discharges with a time constant corresponding to a temperature, and performs the temperature detection based on a time constant of a voltage change during charging or discharging of the charge / discharge circuit. 4. The radio wave correction watch according to 4. The radio-controlled timepiece according to any one of claims 4 to 6, wherein the control unit determines the reception timing based on history information of a temperature detection result by the temperature detection unit.

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