JP2004184088A - Motor driving circuit, and radio controlled timepiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely rotate a motor from a stopped condition when time-correcting a timepiece. <P>SOLUTION: This circuit/timepiece is provided with a clocking part 141 for clocking a time, the motor 131 for a hand operation, a manual operation correction system 150 and an hour, hour/minute hand driving system 130 driven by the motor 131, a memory 142 for storing a history data d142 including phase information of a driving signal, and a control circuit 14 for inputting a pulse signal in response to the history data d142 into the motor 131, for inputting a pulse signal P2 thereafter for driving, for correcting time information of the clocking part 141 based on a standard time radio signal, and for driving the motor 131 in response to a corrected result to correct the display time by the hour, hour/minute hand driving system 130 and the manual operation correction system 150, when inputting an initial phase signal P1 into the motor 131, storing the history data d142 including the phase information, and driving the motor 131 from the stopped condition to correct the time. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to, for example, a motor drive circuit that drives a hand movement motor of a timepiece, and a radio-controlled timepiece.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a hand moving motor that drives a pointer such as a second hand of a timepiece is known (for example, see Patent Document 1).
The above-described motor for moving a needle is composed of, for example, a coil, a stator, and a rotor, and a rotational torque generated by a magnetic moment generated by the coil and applied from the stator and a magnetic moment by a built-in magnet rotates the rotor, and the train wheel from the rotor The hands such as the second hand, the minute hand, and the hour hand are driven through the.
At this time, the above-described hand movement motor is driven by alternately inputting pulse signals having different phases as drive signals.
[0003]
[Patent Document 1]
JP-A-6-153596 (FIG. 3)
[0004]
[Problems to be solved by the invention]
However, in the timepiece using the above-described hand movement motor, for example, the time display indicated by the pointer is corrected by temporarily stopping the hand movement motor and inputting a driving pulse signal to the motor at a desired timing to rotate the rotor. In doing so, the rotor may not rotate unless the phases of the pulse signals are matched, and there is a problem that the time display by the hands cannot be corrected accurately.
[0005]
The present invention has been made in view of such circumstances, and an object thereof is to provide a motor driving circuit and a radio wave correction timepiece that can reliably rotate a motor from a stopped state when the time of the timepiece is corrected. There is to do.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention is a motor drive circuit that inputs a drive signal to a hand movement motor of a timepiece to drive the hand movement motor, and includes phase information of the drive signal. And a phase storage means for storing the initial phase signal for matching the initial phase of the hand movement motor to the hand movement motor, the phase information of the initial phase signal is stored in the phase storage means, When the motor is driven from a stopped state, the motor has a driving unit that inputs and drives the driving signal corresponding to the phase information stored in the phase storage unit.
[0007]
According to the first aspect of the present invention, the phase storage means stores the phase information of the drive signal.
The drive means inputs an initial phase signal for adjusting the initial phase of the hand movement motor to the hand movement motor, stores the phase information of the initial phase signal in the phase storage means, and drives the hand movement motor from the stopped state. Then, a drive signal corresponding to the phase information stored in the phase storage means is input to the hand movement motor for driving.
[0008]
In order to achieve the above object, a second aspect of the present invention is a radio-controlled timepiece that inputs a drive signal to a hand-operated motor to drive the hand-operated motor, receives a standard time radio signal, and corrects the time. The phase storage means for storing the phase information of the drive signal and the initial phase signal for matching the initial phase of the hand movement motor are input to the hand movement motor, and the phase information of the initial phase signal is input to the phase information. When the time is corrected by storing in the phase storage means and driving the hand movement motor from the stopped state, the first or second pulse signal corresponding to the initial phase is input to drive the hand movement motor. Control means.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a radio-controlled timepiece using a motor including a motor drive circuit according to an embodiment of the present invention will be described with reference to FIGS.
[0010]
FIG. 1 is an electrical functional block diagram of an embodiment of a radio-controlled timepiece including a motor employing a motor driving circuit according to the present invention. FIG. 2 is a configuration diagram of the motor and movement of the radio-controlled timepiece shown in FIG. FIG. 3 is an enlarged view of a cross section taken along line AA of the radio-controlled timepiece shown in FIG.
The radio-controlled timepiece 1 according to the present embodiment has one motor as a hand movement motor and drives a train wheel.
[0011]
As shown in FIG. 1, the radio-controlled timepiece 1 according to the present embodiment includes a standard radio wave receiving system 11, a switch group 12, an oscillation circuit 13, a control circuit 14, a timer unit 141, a memory 142, a drive circuit 15, and a notification unit. Light emitting element 16, buffer circuit 17, hour / minute hand motor (also referred to as a motor) 131, capacitors C1 to C3, transistors Q1 and Q2, and resistance elements R1 to R2.
The control circuit 14 corresponds to a motor drive circuit according to the present invention. The motor 131 corresponds to the hand movement motor according to the present invention. The memory 142 corresponds to the phase storage means according to the present invention.
[0012]
The standard radio wave reception system 11 receives, for example, a standard radio wave including standard time information (also referred to as a time code) transmitted from the reception antenna 11a and a standard radio wave transmission station (not shown), performs a predetermined process, and performs a pulse signal. A long wave receiving circuit 11b that outputs to the control circuit 14 as S11 is provided.
The long wave reception circuit 11b includes, for example, an RF amplifier, a detection circuit, a rectification circuit, and an integration circuit (not shown).
The standard radio wave including the standard time information corresponds to the standard time radio signal according to the present invention.
[0013]
In addition, the long wave standard radio wave which is received by the standard radio wave receiving system 11 and accurately conveys the Japanese standard time is transmitted in the following form.
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 standard radio wave receiving system 11 outputs a signal S11 to the control circuit 14 as a pulse signal corresponding to the standard radio wave signal.
[0014]
Japanese standard radio waves are operated by the Communications Research Laboratory (CRL), a standard radio wave transmission station that transmits standard radio waves with a frequency of 40 kHz, and a standard radio wave transmission station that transmits standard radio waves with a frequency of 60 kHz. Is provided.
[0015]
The time code is divided into 60 periods of 1 minute 1 period (1 frame), and 1-bit information is assigned every 1 second. A detailed description of the time code is omitted since it is described in publications such as CRL.
[0016]
The switch group 12 includes a reception and start switch 121, a reception confirmation switch 122, and a reset switch 123.
For example, the reception and start switch 121 starts a hand movement after a battery as a power source is turned on by the user and the time display by the hands is adjusted to the standard time via the manual correction system 150, and receives the standard radio wave to measure the time. It is operated when the counter of the unit 141 is corrected to the standard time, and the signal S121 is output to the control circuit 14.
[0017]
When the reception and start switch 121 is operated and the signal S121 is input, the control circuit 14 drives the motor 131 to drive the train wheel, starts moving the hand, and simultaneously causes the standard radio wave receiving system 11 to receive the standard radio wave to A code is output, and various counters of the timer unit 141 are controlled based on the time code to correct the standard time.
[0018]
The reception confirmation switch 122 is operated, for example, when confirming the reception state of the standard radio wave, and outputs a signal S122 to the control circuit 14. When the reception confirmation switch 122 is operated and the signal S122 is received, the control circuit 14 confirms the reception state of the standard radio wave received by the standard radio wave reception system 11. Specifically, for example, when the standard radio wave signal can hardly be received, the control circuit 14 outputs the drive signal DR1 to the drive circuit 15, causes the light emitting element 16 to emit light, and notifies the user to that effect.
[0019]
The reset switch 123 is operated when resetting and outputs a signal S123 to the control circuit 14. When the reset switch 123 is operated and the signal S123 is received, the control circuit 14 performs predetermined reset processing such as various counters and internal parameters.
[0020]
The oscillation circuit 13 includes a crystal oscillator CRY and capacitors C2 and C3, and supplies a basic clock having a predetermined frequency to the control circuit 14.
[0021]
The control circuit 14 includes a timer unit 141 and a memory 142.
The timer unit 141 includes, for example, an hour counter, a minute counter, a second counter, and the like.
[0022]
The memory 142 is used as a work space of the control circuit 14, for example. The memory 142 stores history data d142. For example, the memory 142 includes a RAM (Random access memory) or the like.
The history data d142 is phase information related to the phase (also referred to as polarity) of the initial phase signal input to the motor 131, for example.
[0023]
The control circuit 14 receives the pulse signal S11 from the standard radio wave reception system 11, compares the received state of the received standard radio signal with a predetermined reference range, and if the reception state is within the reference range, receives the received signal. When the time signal can be timed as a result of the decoding, the count control of various counters is performed based on the basic clock by the oscillation circuit 13.
[0024]
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.
[0025]
Based on the received standard time information, the control circuit 14 compares the time information measured by the various time counters of the time measuring unit 141 with the standard time information. Accordingly, the time counter is corrected, and in response to the correction, a pulse signal P for correction is input to the motor 131 as the control signal CTL1 to perform fast-forward driving or the like, and the time display is corrected by the hands.
[0026]
Specifically, for example, when the time display by the hands is behind the standard time information, the control circuit 14 sends more pulse signals P to the motor 131 than the normal drive signal according to the degree of the delay. Input as control signal CTL1.
For example, when the time display by the hand is advanced from the standard time information, the control circuit 14 inputs a pulse signal P smaller than the normal drive signal to the motor 131 as the control signal CTL1 according to the advancement degree. To do.
[0027]
FIG. 4 is a diagram schematically showing a motor and a control circuit of the radio-controlled timepiece shown in FIG.
The hour / minute hand motor 131 includes a terminal TO1 and a terminal TO2, as shown in FIG. The terminal TO1 and the terminal TO2 are connected to the control circuit 14.
[0028]
The rotor 131c has a magnetic moment 131m by a built-in magnet generated by magnetization, for example.
The intervals between the magnetic poles of the stator 131a and the circular rotor 131c are non-uniformly provided as shown in FIG. Due to the distance between the stator 131a and the rotor 131c, for example, in a state in which no driving pulse is applied, specifically, in a state in which no magnetic field is generated by the coil 131b and the stator 131a does not apply a magnetic field to the rotor 131c, the rotor 131c has a predetermined angle θ. At rest. This state is called a non-excitation stable state. Here, the rotor 131c has an angle of 0 degrees in FIG.
[0029]
For example, in a state where the magnetic field H is generated by the coil 131b through the stator 131a for a sufficient time, the rotor 131c has a rotational moment (also referred to as torque) due to the magnetic moment 131m and the magnetic field H from the coil 121b via the stator 131a. T is generated, and the rotor 131c rotates according to the rotational moment T.
[0030]
At this time, the rotational moment T generated in the rotor 131c is generated by the coil 131b and is generated by the stator 131a to the rotor 131c, the magnetic moment M of the rotor magnet, and the angle θ between the direction of the magnetic field H and the magnetic moment M, There is a relationship as shown in Formula (1).
[0031]
[Expression 1]
T = H × M × sin (θ) (1)
[0032]
When the motor 131 is driven and rotated, the control circuit 14 alternately inputs pulse signals P having different phases as drive signals to rotate the rotor 131c.
Specifically, the control circuit 14 alternately inputs the pulse signal P2 to the terminal TO1 and the terminal TO2, inputs the pulse signal P2 to the coil 131b, generates the magnetic field H in the coil 131b, and applies the magnetic field H to the rotor c131 through the stator 131a. This is applied to rotate the rotor 131c.
[0033]
At this time, if the phase of the pulse signal P21 first input to the motor 131 from the stopped state is not matched, the rotor 131c may not rotate with the first pulse signal P21. Specifically, when the direction of the magnetic field H first applied to the rotor 131c and the direction of the magnetic moment 131m of the rotor 131c are opposite to the angle at which rotation can be started by 180 degrees, sufficient torque T cannot be obtained. May not rotate.
[0034]
Therefore, the control circuit 14 according to the present embodiment inputs an initial phase signal P1 for adjusting the initial phase of the motor 131 to the motor 131, and drives the hand movement motor from the stopped state based on the input result. At this time, after inputting the pulse signal P21 corresponding to the initial phase, pulse signals P2 having different phases are alternately input to the motor 131 to drive them.
[0035]
FIG. 5 is a diagram for explaining a specific example of the operation of the control circuit shown in FIG. FIG. 5A is a diagram for explaining a pulse signal output from the control circuit to the motor in the initial state. FIG. 5B is a diagram for explaining a pulse signal output from the control circuit to the motor when the motor is driven from the stopped state.
[0036]
As shown in FIG. 5A, the control circuit 14 inputs an initial phase signal P1 having a predetermined phase to the motor 131 in order to adjust the phase of the motor 131 in an initial state, for example, when a battery as a power source is turned on. .
In the present embodiment, the pulse signal is a pulse signal having a predetermined voltage and a predetermined time width, for example, 24 ms.
[0037]
For example, as shown in FIG. 5A, the control circuit 14 inputs a predetermined number, for example, three pulse signals P11, P12, and P13 to the terminal TO1 and the terminal TO2 as the initial phase signal P1 to the motor 131, The phase of the motor 131 is adjusted.
The control circuit 14 stores the initial phase information of the initial phase signal P1 in the memory 142 as history data d142. At this time, the control circuit 14 does not clear the area in which the history data d142 is written in the initial setting step.
Specifically, the control circuit 14 stores, for example, the phase information of the last pulse signal P13 of the initial phase signal P1 in the memory 142 as history data d142.
[0038]
At the time of initial power-on or reset, the control circuit 14 keeps the motor 131 stopped, and the user manually operates the manual correction system 150 to drive the train wheel and set the hands to the standard time.
[0039]
Thereafter, for example, when the reception and start switch 121 is operated at time t1, the control circuit 14 determines the initial phase of the initial phase signal P1, for example, the phase of the pulse signal P13, based on the history data d142 stored in the memory 142. The pulse signal P21 having the opposite phase to the motor 131 is input to the motor 131, and then the pulse signal P having a different phase as the drive signal P2 is input to the motor 131 to rotate and drive the motor 131.
[0040]
At this time, the control circuit 14 assumes that the time information of the time measuring unit 141 corresponding to the received standard time information matches the pointer position, and then the standard radio wave information received at a predetermined reception time, In accordance with the error in the time information of the unit 141, a pulse signal for time correction such as a fast rotation of the motor 131 is input, and the time display is corrected by the hands.
[0041]
As shown in FIG. 5B, when the reset switch 123 is operated and the motor 131 is stopped while the power is on, the control circuit 14 sets the pulse signal P22 of the drive signal immediately before the stop. The phase information is stored in the memory 142 as the history data d142, and when the reception and start switch 141 is operated at the time t2, the immediately preceding pulse stopped based on the history data d142 stored in the memory 142. A pulse signal P21 having a phase opposite to that of the signal P22 is input to the motor 131, and thereafter, a pulse signal P2 having a different phase as a drive signal is alternately input to the motor 131 to rotate and drive the motor 131.
[0042]
As shown in FIG. 1, the drive circuit 15 includes a pnp transistor Q1 and resistors R1 and R2.
The base of the transistor Q1 is connected to the output line of the drive signal DR1 of the control circuit 14 via the resistor element R1, the collector is connected to the anode of the light emitting element 16 made of, for example, a light emitting diode, and the emitter is connected via the resistor element R2. Power supply voltage V _CC Connected to the supply line. The cathode of the light emitting element 16 is grounded.
The light emitting element 16 blinks in response to the drive signal DR1 output from the control circuit 14 at regular intervals.
[0043]
As shown in FIGS. 2 and 3, the timepiece main body 100 has a lower case 111, an upper case 112 that are connected to face each other to form an outline, and a lower space in 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.
A drive system for driving the hour / minute hands with respect to predetermined positions of the lower case 111, the middle plate 113, and the upper case 112 in the space, that is, an hour / minute hand drive system 130, and a manual correction system for manually correcting the time. 150 and the like are fixed or pivotally supported.
In the present embodiment, as a minimum unit when considering the movement of the drive system, it is referred to as one step that the control circuit 14 oscillates a pulse signal once to drive the motor 131 in pulses.
[0044]
As shown in FIGS. 2 and 3, the hour / minute hand driving system 130 which is a pointer driving system includes a substantially U-shaped stator 131a, a driving coil 131b wound around one leg piece of the stator 131a, An hour and minute hand motor 131 constituted by a rotor 131c rotatably supported between the other magnetic poles of 131a, a second fifth wheel 132 as an intermediate wheel meshing with a pinion 131d of the rotor 131c, A third wheel 133 as a second transmission gear meshed with the second fifth wheel 132, a minute hand wheel 134 meshed with the third wheel 133, and a minute wheel 135 as an intermediate wheel meshed with the minute hand wheel 134. And an hour hand wheel 136 that meshes with the reverse wheel 135 of this day.
[0045]
Here, the rotation direction, the rotation angle, and the rotation speed of the hour / minute hand motor 131 are controlled based on the control signal CTL1 output from the control circuit 14.
[0046]
The manual correction system 150 includes a minute wheel 135 that meshes with the minute hand wheel 134 and the hour hand wheel 136 described above, and a manual correction shaft 151 that meshes with the minute wheel 135 of this date. The manual correction shaft 151 is positioned outside the upper case 112 and has a head 151b that can be directly touched by the user.
[0047]
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-mentioned hour / minute hand driving system 130, the minute hand wheel 134 is connected via the minute wheel 135. The pointer position can be manually corrected by rotating the head 151b with a finger when the hour / minute hand drive system 130 is not in operation.
[0048]
FIG. 6 is a flowchart for explaining the operation of the radio-controlled timepiece shown in FIG. The operation of the radio-controlled timepiece 1 will be described focusing on the operation of the control circuit 14 with reference to FIG.
[0049]
In step ST <b> 1, when the control circuit 14 is turned on, for example, a battery or the like, the control circuit 14 returns the various states to the initial state.
In step ST <b> 2, the control circuit 14 determines whether or not history data d <b> 142 is stored in the memory 142.
[0050]
For example, since the data stored in the memory 142 is indefinite in the initial state when the power is turned on, the control circuit 14 stores the history data d142 depending on whether or not it matches the specific data set in advance. It is determined whether or not.
[0051]
If it is determined in step ST2 that the history data d142 is not stored, the control circuit 14 receives the initial phase signal P1, for example, the initial phase signal from the terminal TO1 and the terminal TO2, as shown in FIG. P11, P12, and P13 are input, phase adjustment of the motor 131 is performed (ST3), information regarding the phase of the initial phase signal P1 is stored in the memory 142 as history data d142 (ST4), and the process proceeds to step ST5.
On the other hand, if it is determined in step ST2 that the history data d142 is stored in the memory 142, the process proceeds to step ST5.
[0052]
In step ST5, the manual correction system 150 is operated by the user, and the time display by the hands is set to the standard time.
The control circuit 14 determines whether or not the reception and start switch 121 has been operated, and specifically determines whether or not the signal S121 is output.
[0053]
If it is determined in step ST5 that the reception and start switch 121 has been operated, the control circuit 14 starts forced reception processing and hand movement (ST6).
More specifically, the control circuit 14 supplies driving power to the standard radio wave reception system 11 to forcibly receive the standard time radio wave signal, and causes the motor 131 to drive the drive signal as shown at time t1 in FIG. P21 and P2 are input and rotated.
[0054]
At this time, the control circuit 14 inputs an initial phase signal P1, for example, a pulse signal P21 having a phase opposite to the phase of the pulse signal P13, based on the history data d142 stored in the memory 142 at the beginning of startup. Thereafter, the pulse signal P2 having a different phase is inputted and driven by the motor 131.
The wheel train of the hour / minute hand drive system 130 is rotated by the rotation of the motor 131 and the hands are moved.
[0055]
In step ST7, the control circuit 14 determines whether or not the standard radio wave reception system 11 has received the standard radio wave.
Specifically, in the standard radio signal system 11, the pulse signal S11 corresponding to the reception state is generated from the long wave receiving circuit 11b and output to the control circuit 14. In the control circuit 14, the pulse signal S11 indicating the reception state of the received standard radio wave signal is compared with a predetermined reference range. As a result, if the reception state is within the reference range, reception is possible (time setting). The received radio wave is decoded.
As a result of decoding, when the time can be set, various counters of the time measuring unit 141 are controlled based on the basic clock by the oscillation circuit 13.
[0056]
In step ST8, the control circuit 14 matches the phase of the motor 131 with the second counter timed by the time measuring unit 141, and sets the reception state of the standard radio wave in the memory 142 (ST9).
On the other hand, if the standard radio wave receiving system 11 cannot receive the standard radio wave in step ST7, the control circuit 14 sets a reception state indicating that in the memory 142 (ST9).
[0057]
In step ST10, the control circuit 14 determines whether or not 1 second has been counted based on the basic clock output from the oscillation circuit 13. When counting 1 second, the second counter of the time measuring unit 141 is added ( (ST11) The drive pulse P is input to the motor 131 to drive the motor (ST12).
[0058]
In step ST13, the control circuit 14 determines whether or not the time information timed by the time measuring unit 141 is an automatic reception time for receiving a predetermined standard radio wave. If it is not an automatic reception time, step ST10 Return to the process.
The automatic reception time is set several times a day, for example, around 2:14 am, 8:14 am, 2:14 pm, and 8:14 pm.
[0059]
On the other hand, if it is determined in step ST13 that it is the automatic reception time, the control circuit 14 supplies driving power to the standard radio wave reception system 11 to receive the standard time radio wave (ST14).
The control circuit 14 compares the time information measured by the various time counters of the time measuring unit 141 based on the received standard time signal, and if an error occurs, the time counter corresponds to the error. Is corrected, and a pulse signal P for correction is input to the motor 131 in accordance with the error to perform fast-forward driving and the like, and the time display is corrected by the hands (ST15). At this time, if the reception state is not good, the time adjustment process is not performed.
[0060]
In step ST15, the control circuit 14 sets the reception state of the standard radio wave by the standard radio wave reception system 11 in the memory 142, and returns to the process of step ST10.
[0061]
As described above, the reception and start switch 121, the timekeeping unit 141 that measures time, the motor 131 for moving hands, the manual correction system 150 that is driven by the motor 131 and can manually correct the time, and the hour and minute hands. The drive system 130, the memory 142 for storing the history data d142 relating to the phase information of the initial phase signal P1 for matching the initial phase of the motor 131, and the history data indicating the result of the input by inputting the initial phase signal P1 to the motor 131. When d142 is stored in the memory 142 and the motor 131 is driven from a stopped state, a pulse signal corresponding to the initial phase based on the history data d142, for example, a pulse signal P21 having a phase opposite to the initial phase P1 is output to the motor 131. And then input a pulse signal P2 having different phases alternately as a drive signal, 31, the time information of the timekeeping unit is corrected based on the standard time radio signal, and the motor 131 is driven according to the correction result to correct the display time by the hour / minute hand drive system 130 and the manual correction system 150. Since the circuit 14 is provided, the rotor 131c can be reliably rotated when the stepping motor 131 is started from the stopped state.
[0062]
In the state where the motor 131 is stopped, the user manually operates the manual correction system 150 to set the time display to the standard time, and operates the reception and start switch 121 at a desired timing to display the time of the pointer. Is accurately set to the standard time. The control circuit 14 causes the standard radio wave reception system 11 to receive the standard time radio signal at a predetermined time, corrects the time information measured by the time measuring unit 141 based on the standard time signal, and according to the result of the correction. Since the motor 131 is driven to correct the time display by the hour / minute hand drive system 130, for example, a train wheel having no position detection mechanism such as a skeleton-type train wheel with a semi-transparent watch body 100 is provided. Even if it is used, time correction can be performed.
[0063]
Further, since the control circuit 14 outputs a pulse signal as the initial phase signal P1 only when the power is turned on, the pointer only slightly moves for a moment, so that the user does not feel uncomfortable compared with a general timepiece.
[0064]
In addition, for example, when a radio-controlled timepiece is used to stop the second hand at night and start up after a predetermined time, the motor 131 can accurately follow and rotate by using the control circuit 14 according to the present embodiment described above. Therefore, the time error can be suppressed and the time accuracy can be maintained with high accuracy.
[0065]
Note that the present invention is not limited to the present embodiment, and various suitable modifications can be made.
In the radio-controlled timepiece 1 according to the present embodiment, the control circuit 14 and the timer unit 141 are provided separately, but the present invention is not limited to this mode. For example, a timer 141 may be provided inside the control circuit 14.
[0066]
In the present embodiment, the hour / minute hand motor has been described as an example, but the present invention is not limited to this mode. For example, even when a second hand motor is further provided, the initial phase signal is input to the second hand motor in advance as described above to perform phase matching, and when starting from a stopped state, the phase opposite to that phase is obtained. By first inputting the pulse signal to the motor and then alternately inputting the pulse signals having different phases, the motor can be reliably started and the time can be accurately set.
[0067]
In the present embodiment, the memory 142 is constituted by a RAM, but is not limited to this form. For example, by using a nonvolatile RAM as the memory 142, the history data d142 can be held even when temporary power is not supplied and power is supplied again. In this case, when starting the motor from the stopped state, a pulse signal for starting the phase corresponding to the history data d142 is input without inputting the initial phase signal for adjusting the phase of the motor. Thus, the motor can be reliably rotated.
[0068]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, when performing time adjustment of a timepiece, the motor drive circuit and radio wave correction timepiece which can rotate a motor reliably from a stop state can be provided.
[Brief description of the drawings]
FIG. 1 is an electrical functional block diagram of an embodiment of a radio-controlled timepiece including a motor employing a motor driving circuit according to the present invention.
2 is a configuration diagram of a motor and a movement of the radio-controlled timepiece shown in FIG. 1. FIG.
3 is an enlarged view of a cross section taken along the line AA of the radio wave correction watch shown in FIG. 2;
4 is a diagram schematically showing a motor and a control circuit of the radio wave correction timepiece shown in FIG. 2. FIG.
FIG. 5 is a diagram for explaining a specific example of the operation of the control circuit shown in FIG. 1; (A) is a figure for demonstrating the pulse signal output to a motor from a control circuit in an initial state. (B) is a figure for demonstrating the pulse signal output to a motor from a control circuit, when driving a motor from a stop state.
6 is a flowchart for explaining the operation of the radio-controlled timepiece shown in FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Radio wave correction clock, 11 ... Standard radio wave receiving system, 11a ... Reception antenna, 11b ... Long wave receiving circuit, 12 ... Switch group, 13 ... Oscillation circuit, 14 ... Control circuit, 15 ... Drive circuit, 16 ... Light emitting element, 17 DESCRIPTION OF SYMBOLS ... Buffer circuit, 100 ... Clock body, 111 ... Lower case, 112 ... Upper case, 113 ... Middle plate, 121 ... Reception and start switch, 122 ... Reception confirmation switch, 123 ... Reset switch, 130 ... Hour / minute hand drive system, 131 ... Motor, 131a ... Stator, 131b ... Drive coil, 131c ... Rotor, 131d ... Pinion, 131m ... Magnetic moment, 132 ... Fifth wheel, 133 ... Third wheel, 134 ... Minute hand wheel, 135 ... Sun wheel, 136 ... hour hand wheel, 141 ... timing unit, 142 ... memory, 150 ... manual correction system, 151 ... manual correction shaft, 151b ... head.

Claims (5)

A motor drive circuit for driving the hand movement motor by inputting a drive signal to the hand movement motor of the timepiece,
Phase storage means for storing phase information of the drive signal;
When an initial phase signal for adjusting the initial phase of the hand movement motor is input to the hand movement motor, the phase information of the initial phase signal is stored in the phase storage means, and the hand movement motor is driven from a stopped state Further, a motor drive circuit having drive means for driving the drive signal according to the phase information stored in the phase storage means by inputting the drive signal to the hand movement motor. The drive means inputs the first or second pulse signal having a different phase as an initial phase signal to the hand movement motor, and stores phase information corresponding to the first or second pulse signal in the phase storage means. And when driving the hand movement motor from a stopped state, after inputting the first or second pulse signal corresponding to the phase information stored in the phase storage means, the first and second The motor drive circuit according to claim 1, wherein the pulse signal is alternately input to and driven by the hand movement motor. A radio-controlled timepiece that inputs a drive signal to the hand movement motor to drive the hand movement motor, receives a standard time radio signal, and corrects the time,
Phase storage means for storing phase information of the drive signal;
An initial phase signal for adjusting the initial phase of the hand movement motor is input to the hand movement motor, the phase information of the initial phase signal is stored in the phase storage means, and the hand movement motor is driven from a stopped state. A radio-controlled timepiece having control means for driving the hand movement motor by inputting the first or second pulse signal corresponding to the initial phase when performing time correction. The control means inputs a first or second pulse signal having a different phase as an initial phase signal to the hand movement motor, and stores phase information corresponding to the first or second pulse signal in the phase storage means. When the time adjustment is performed by driving the needle motor from a stopped state, after inputting the first or second pulse signal corresponding to the phase information stored in the phase storage means, The radio-controlled timepiece according to claim 3, wherein the first and second pulse signals are alternately input to and driven by the hand movement motor. A pointer drive unit that is driven by the hand movement motor and allows manual time correction;
And a timekeeping section for measuring time,
The control unit corrects the time information of the timekeeping unit based on the received standard time radio signal, and corrects the display time by the pointer driving unit by driving the hand movement motor according to the correction result. The radio-controlled timepiece according to claim 3 or 4.

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