JP6562527B2 - Reference position determination method for watch movement, watch and watch hands - Google Patents

Description

  The present invention relates to a timepiece movement, a timepiece, and a reference position determination method for a timepiece pointer.

  In a timepiece, as a method for detecting the position of a pointer, for example, it is known that a hole included in a gear wheel constituting a train wheel is sandwiched between a light emitting element and a light receiving element and detected by the presence or absence of transmitted light.

  In addition, a rotation state detection technique has been proposed in which a timepiece hand is driven by a drive pulse during normal driving and the rotation state is detected by an induced voltage (see, for example, Patent Document 1). In the invention described in Japanese Patent Application Laid-Open No. H10-228707, when the non-rotation state is detected by the detection method, the hand movement is realized by applying a rotational force with an auxiliary drive pulse.

  Furthermore, a technique has been proposed in which when the timepiece control unit detects a predetermined high load corresponding to the reference position of the hands, it is determined as the reference position (Patent Document 2). In the invention described in Patent Document 2, the reference position is determined according to the state in which the auxiliary drive pulse is output.

Japanese Patent No. 5363167 Japanese Patent No. 3625395

However, in the conventional technique described in Patent Document 2, to be provided load as auxiliary driving pulse is outputted when it is detected that the non-rotating state, it is difficult to determine the reference position. In addition, when the auxiliary drive pulse is used, power consumption required for driving increases.

  The present invention has been made in view of the above-described problems, and a movement for a timepiece, a timepiece, and a timepiece that can realize a means for grasping the reference position of a pointer even with a predetermined load that can be normally operated. It aims at providing the reference position judgment method of a pointer.

In order to achieve the above object, a timepiece movement according to an aspect of the present invention is provided at a predetermined position in a driving mechanism including a stepping motor having a rotor for rotating a pointer, the pointer and the rotor, and the pointer is A reference load section that varies the load received by the rotor when positioned at a reference position, and the rotor is rotated by a main drive pulse and an auxiliary drive pulse, and at least the pointer is detected by a detection drive pulse based on the main drive pulse. A control unit that determines a reference position of the pointer by detecting a rotation state of the rotor over one cycle that rotates once , and the control unit includes a first detection period after the detection drive pulse is output; , At least one of a detection period including a second detection period following the first detection period and a third detection period following the second detection period The rotation state of the rotor is detected by detecting an induced voltage in a period, and based on at least two detection results among the first detection period, the second detection period, and the third detection period, When the load variation by the reference load unit is determined only once, the position where the change is determined is determined as the reference position.
A timepiece movement according to one aspect of the present invention includes a stepping motor having a rotor for rotating a pointer,
A reference load unit that is provided at a predetermined position in a drive mechanism including the pointer and the rotor, and that varies a load received by the rotor when the pointer is positioned at a reference position, and a main drive pulse and an auxiliary drive pulse, A control unit for rotating the rotor and determining a reference position of the pointer by detecting a rotation state of the rotor over a period in which the pointer rotates at least once by a detection driving pulse based on the main driving pulse; The control unit includes a first detection period after the output of the detection drive pulse, a second detection period following the first detection period, and a third detection period following the second detection period. Rotating state of the rotor is detected by detecting an induced voltage in at least one period, and the first detection period, the second detection period, and the third detection period Based on at least two detection result of the load variations due to at least two of the reference load section to said one period is when it is detected, to determine the largest position its load variation as the reference position.
A timepiece movement according to one aspect of the present invention is provided at a predetermined position in a stepping motor having a rotor for rotating a pointer, and the pointer and the rotor, and the pointer is positioned at a reference position. A reference load portion that varies the load received by the rotor, and a period in which the pointer is rotated at least once by the detection drive pulse based on the main drive pulse by rotating the rotor by a main drive pulse and an auxiliary drive pulse. A control unit that determines a reference position of the pointer by detecting a rotation state of the rotor, and the control unit includes a first detection period after the output of the detection drive pulse, and a first detection period. The induced voltage is generated in at least one of a detection period including a second detection period that follows and a third detection period that follows the second detection period. The rotation state of the rotor is detected, and based on at least two detection results of the first detection period, the second detection period, and the third detection period, at least two times during the one period When a load fluctuation is detected by the reference load unit, the position where the load fluctuation is first detected is determined as the reference position.

Also, a timepiece movement according to one embodiment of the present invention, the control unit, the detection drive pulse is set to a first energy, and detects the rotation state of the rotor over prior Symbol one period, the 1 If the load fluctuation due to the reference load portion in the circumferential period is not determined, to set the detection driving pulses to the first energy is less than the second energy, over the one period by the detecting driving pulse of the second energy the When the rotation state of the rotor is detected, and the load fluctuation by the reference load unit is determined twice or more during the one cycle, the detection drive pulse is set to a third energy larger than the first energy, and the third by the detecting driving pulse energy may be detected a rotational state of the rotor over the one period.

Also, a timepiece movement according to one embodiment of the present invention, the control unit, according to prior SL when the load fluctuation due to the reference load portion in one period is not determined, or not continuous two or more said reference load portion If the load change is determined, the rotational state of the rotor over the detecting the one period again without changing the energy of the drive pulse may put biopsy.

Further, in the timepiece movement according to one aspect of the present invention, when the control unit detects the first rotation state, the control unit moves the hand with the detection drive pulse, and detects the second rotation state. When the second driving state is detected when the auxiliary driving pulse is added after the detection driving pulse is moved, the load fluctuation caused by the reference load unit is determined when the second rotation state is detected. the reference position may be judged.
The first rotation state is a state in which the pointer is moved using the detection drive pulse without using the auxiliary drive pulse. The second rotation state is a state where the pointer is moved using the auxiliary drive pulse after the detection drive pulse.

Also, a timepiece movement according to one embodiment of the present invention, the control unit, in one position of the front Symbol one period, the reference load portion in the second detection period and the first detection period If the induced voltage based on the reference load unit is detected in the third detection period without detecting the induced voltage based on the reference load unit in the second detection period The reference position may be determined.

  In the timepiece movement according to one aspect of the present invention, the control unit may store the detection drive pulse used when the reference position can be determined as an optimum pulse.

  Further, in the timepiece movement according to one aspect of the present invention, the control unit may control the stepping motor so that the optimum pulse moves the pointer.

  A timepiece according to one embodiment of the present invention includes any one of the timepiece movements described above.

In order to achieve the above object, a method for determining a reference position of a timepiece pointer according to an aspect of the present invention includes a predetermined step in a stepping motor having a pointer, a rotor that rotates the pointer, and the pointer and the rotor. A reference load section that is provided at a position and that varies the load received by the rotor when the pointer is positioned at a reference position; and a detection based on the main drive pulse by rotating the rotor by a main drive pulse and an auxiliary drive pulse A reference position determination method for a timepiece pointer in a timepiece, comprising a control unit that determines a reference position of the pointer by detecting a rotation state of the rotor over a period in which the pointer rotates at least once by a drive pulse. the control unit includes a first detection period after the output of the detection drive pulse, and the second detection period subsequent to the first detection period, the first Detecting the rotation state of the rotor by detecting an induced voltage in at least one period of a detection period including a third detection period following the detection period; and the control unit includes the first detection period, the second detection period, and the second detection period. Based on the detection result of at least two of the detection period and the third detection period, when the load fluctuation by the reference load unit is determined only once during the one period, the position where the change is determined is determined as the reference Determining as a position .
In order to achieve the above object, a method for determining a reference position of a timepiece pointer according to an aspect of the present invention is provided at a predetermined position in a stepping motor having a rotor for rotating a pointer, and a driving mechanism including the pointer and the rotor. A reference load unit that varies the load received by the rotor when the pointer is positioned at a reference position, and the rotor is rotated by a main drive pulse and an auxiliary drive pulse, and a detection drive pulse based on the main drive pulse A method for determining a reference position of a timepiece in a timepiece, comprising: a control unit that determines a reference position of the pointer by detecting a rotation state of the rotor over a period in which the pointer rotates at least once. The unit includes a first detection period after the output of the detection drive pulse, a second detection period following the first detection period, and the second detection period. Detecting a rotation state of the rotor by detecting an induced voltage in at least one period of a detection period including a third detection period subsequent to the first detection period, the second detection period When a load fluctuation due to the reference load unit is detected at least twice during the one period based on at least two detection results in the third detection period, a position having the largest load fluctuation is set as the reference position. Determining.
In order to achieve the above object, a method for determining a reference position of a timepiece pointer according to an aspect of the present invention is provided at a predetermined position in a stepping motor having a rotor for rotating a pointer, and a driving mechanism including the pointer and the rotor. A reference load unit that varies the load received by the rotor when the pointer is positioned at a reference position, and the rotor is rotated by a main drive pulse and an auxiliary drive pulse, and a detection drive pulse based on the main drive pulse A method for determining a reference position of a timepiece in a timepiece, comprising: a control unit that determines a reference position of the pointer by detecting a rotation state of the rotor over a period in which the pointer rotates at least once. The unit includes a first detection period after the output of the detection drive pulse, a second detection period following the first detection period, and the second detection period. Detecting a rotation state of the rotor by detecting an induced voltage in at least one period of a detection period including a third detection period subsequent to the first detection period, the second detection period , When at least two load fluctuations due to the reference load unit are detected during the one period based on at least two detection results in the third detection period, the position where the load fluctuation is first detected is the reference Determining as a position.

  According to the present invention, the means for grasping the reference position of the pointer can be realized by a predetermined load that can be normally operated.

It is a block diagram which shows the structural example of the timepiece which concerns on this embodiment. It is a figure for demonstrating an example of the reference | standard load part which concerns on this embodiment, and a reference | standard position. It is a block diagram which shows the structural example of the pointer drive part and motor load detection part which concern on this embodiment. It is a figure which shows the example of the drive signal which the pulse control part which concerns on this embodiment outputs. It is a figure which shows the structural example of the motor which concerns on this embodiment. It is a figure which shows the example of the induced voltage which generate | occur | produces the main drive pulse P1 and motor rotation which concern on this embodiment. It is a figure for demonstrating the relationship between the state of the load which concerns on this embodiment, and an induced voltage. It is a figure for demonstrating the outline | summary of the procedure which detects the pointer position which concerns on this embodiment. It is a flowchart which shows the example of a process sequence which performs the needle | hook position detection which concerns on this embodiment. It is a flowchart which shows the example of a process sequence which performs the needle | hook position detection which concerns on the modification of this embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings used for the following description, the scale of each member is appropriately changed in order to make each member a recognizable size.

FIG. 1 is a block diagram illustrating a configuration example of a timepiece 1 according to the present embodiment. As shown in FIG. 1, the timepiece 1 includes a battery 2, an oscillation circuit 3, a frequency dividing circuit 4, a storage unit 5, a control unit 10, a first motor 20a, a second motor 20b, a third motor 20c, a train wheel 30a, a wheel A row 30b, a train wheel 30c, a first pointer 40a, a second pointer 40b, and a third pointer 40c are provided.
The control unit 10 includes a pulse control unit 11 and a pointer driving unit 12.
The pointer drive unit 12 includes a first pointer drive unit 121a, a motor load detection unit 122a, a second pointer drive unit 121b, a motor load detection unit 122b, a third pointer drive unit 121c, and a motor load detection unit 122c.
The timepiece movement includes at least a storage unit 5, a control unit 10, a first motor 20a, a second motor 20b, a third motor 20c, a train wheel 30a, a train wheel 30b, and a train wheel 30c.

  When one of the first motor 20a, the second motor 20b, and the third motor 20c is not specified, the motor 20 is referred to. Further, when one of the train wheel 30a, the train wheel 30b, and the train wheel 30c is not specified, it is referred to as a train wheel 30. Further, when one of the first pointer 40a, the second pointer 40b, and the third pointer 40c is not specified, it is referred to as a pointer 40. Further, when one of the first pointer driving unit 121a, the second pointer driving unit 121b, and the third pointer driving unit 121c is not specified, it is referred to as a pointer driving unit 121. Further, when one of the motor load detection unit 122a, the motor load detection unit 122b, and the motor load detection unit 122c is not specified, the motor load detection unit 122 is referred to.

  The timepiece 1 shown in FIG. 1 is an analog timepiece that displays the time measured by the hands 40. In the example illustrated in FIG. 1, the timepiece 1 is an example including three hands 40, but the number of hands 40 may be one, two, or four or more. In that case, the timepiece 1 includes a pointer drive unit 121, a motor load detection unit 122, a motor 20, and a train wheel 30 for each pointer 40.

  The battery 2 is, for example, a lithium battery or a silver oxide battery, and is a so-called button battery. The battery 2 may be a solar battery and a storage battery that stores electric power generated by the solar battery. The battery 2 supplies power to the control unit 10.

The oscillation circuit 3 is a passive element that uses a piezoelectric phenomenon of quartz, for example, and oscillates a predetermined frequency from its mechanical resonance. Here, the predetermined frequency is, for example, 32 [kHz].
The frequency dividing circuit 4 divides the signal of the predetermined frequency output from the oscillation circuit 3 to a desired frequency, and outputs the divided signal to the control unit 10.

  The storage unit 5 stores main drive pulses and auxiliary drive pulses of the first pointer 40a, the second pointer 40b, and the third pointer 40c. The main drive pulse and auxiliary drive pulse will be described later. The storage unit 5 stores search pulses for the first pointer 40a, the second pointer 40b, and the third pointer 40c. The search pulse is used when the reference position of the pointer 40 is detected. The detection of the search pulse and the reference position will be described later. The storage unit 5 stores the combination of the output of the comparator Q7 (see FIG. 3) included in the motor load detection unit 122, the rotation state, and the state of the motor 20 in the sections T1 to T3. The sections T1 to T3 will be described later with reference to FIG. The storage unit 5 stores a predetermined period, a pulse width in a drive pulse described later, the number of pulses in the drive pulse, the number of changed pulses, and the like. The storage unit 5 stores a program used by the control unit 10 for control.

  The control unit 10 measures the time using the desired frequency divided by the frequency dividing circuit 4, and drives the motor 20 to move the pointer 40 according to the timed result. Further, the control unit 10 detects a counter electromotive voltage (induced voltage) generated by the rotation of the motor 20, and detects the reference position of the pointer 40 based on the detected result. A reference position detection method will be described later.

The pulse control unit 11 measures the time using the desired frequency divided by the frequency dividing circuit 4, generates a pulse signal so as to move the pointer 40 according to the measured result, and drives the generated pulse signal as a pointer. To the unit 12. Further, the pulse control unit 11 acquires a comparison result between the induced voltage generated in the motor 20 detected by the pointer driving unit 12 and the reference voltage, and detects the reference position based on the acquired result.
In the pulse control unit 11, the drive terminal M111, the drive terminal M112, the drive terminal M121, the drive terminal M122, the control terminal G11, and the control terminal G12 are connected to the first pointer drive unit 121a, and the detection terminal CO1 detects the motor load. Connected to the section 122a. Further, the drive terminal M211, the drive terminal M212, the drive terminal M221, the drive terminal M222, the control terminal G21, and the control terminal G22 are connected to the second pointer drive unit 121b, and the detection terminal CO2 is connected to the motor load detection unit 122b. Yes. Further, the drive terminal M311, the drive terminal M312, the drive terminal M321, the drive terminal M322, the control terminal G31, and the control terminal G32 are connected to the third pointer drive unit 121c, and the detection terminal CO3 is connected to the motor load detection unit 122c. Yes.

  The pointer driving unit 12 moves the pointer 40 by driving the motor 20 in accordance with the pulse signal output from the pulse control unit 11. The pointer driving unit 12 detects an induced voltage generated when the motor 20 is driven, and outputs a comparison result between the detected induced voltage and a reference voltage to the pulse control unit 11.

  The first pointer driving unit 121a generates a pulse signal for rotating the first motor 20a forward or backward according to the control of the pulse control unit 11. The first pointer driving unit 121a drives the first motor 20a by the generated pulse signal.

  The second pointer drive unit 121b generates a pulse signal for rotating the second motor 20b forward or backward according to the control of the pulse control unit 11. The second pointer drive unit 121b drives the second motor 20b with the generated pulse signal.

  The third pointer driving unit 121c generates a pulse signal for rotating the third motor 20c forward or backward according to the control of the pulse control unit 11. The third pointer driving unit 121c drives the third motor 20c with the generated pulse signal.

  The motor load detection unit 122a detects a counter electromotive voltage generated in the first pointer driving unit 121a by the rotation of the first motor 20a, and compares the detected counter electromotive voltage with a reference voltage Vcomp that is a threshold value as a pulse control unit. 11 is output.

  The motor load detection unit 122b detects a counter electromotive voltage generated in the second pointer driving unit 121b due to the rotation of the second motor 20b, and outputs the result of comparing the detected counter electromotive voltage with the reference voltage Vcomp to the pulse control unit 11. To do.

  The motor load detection unit 122c detects a counter electromotive voltage generated in the third pointer driving unit 121c due to the rotation of the third motor 20c, and outputs the result of comparing the detected counter electromotive voltage with the reference voltage Vcomp to the pulse control unit 11. To do.

  Each of the first motor 20a, the second motor 20b, and the third motor 20c is, for example, a stepping motor. The first motor 20a drives the first pointer 40a via the train wheel 30a by the pulse signal output from the first pointer driving unit 121a. The second motor 20b drives the second pointer 40b via the train wheel 30b by the pulse signal output from the second pointer drive unit 121b. The third motor 20c drives the third pointer 40c via the train wheel 30c by the pulse signal output from the third pointer driving unit 121c.

  Each of the train wheel 30a, the train wheel 30b, and the train wheel 30c includes at least one gear. In the present embodiment, the wheel train 30 is formed so that the load fluctuates at one point while the pointer 40 rotates 360 degrees by processing the shape of the gears of the wheel train 30, for example. . In other words, in the present embodiment, the reference load portion is provided at a predetermined position in a drive mechanism including the pointer 40 and the rotor of the motor 20, and changes the load received by the rotor when the pointer 40 is positioned at the reference position. It is configured as follows.

  The first pointer 40a is, for example, an hour hand. The second pointer 40b is, for example, a minute hand. The third pointer 40c is, for example, a second hand. Each of the first pointer 40a, the second pointer 40b, and the third pointer 40c is rotatably supported by a support body (not shown).

Next, the reference load unit and the reference position will be described.
FIG. 2 is a diagram for explaining an example of the reference load unit and the reference position according to the present embodiment. The pointer 40 in FIG. 2 is a third pointer 40c that is a second hand, for example.
In FIG. 2, the position at approximately 12 o'clock is the reference position, and when the pointer is in this position (first area), the load received by the rotor is larger than in other positions (second area). That is, in the example shown in FIG. 2, the reference load portion is provided at the approximately 12 o'clock position. In other words, the load on the first region received by the rotor is greater than the load on the second region. In this embodiment, the position where the load received by the rotor is increased is detected as the reference position.
In FIG. 2, an example in which the position at approximately 12:00 is the reference position is shown, but the reference position may be another position. Further, the reference positions of the first pointer 40a, the second pointer 40b, and the third pointer 40c may be the same position or different positions.

Next, configuration examples of the pointer driving unit 121 and the motor load detecting unit 122 will be described.
FIG. 3 is a block diagram illustrating a configuration example of the pointer driving unit 121 and the motor load detecting unit 122 according to the present embodiment.
As shown in FIG. 3, the pointer driving unit 121 includes switching elements Q1 to Q6. The motor load detection unit 122 includes resistors R1 and R2 and a comparator Q7.

The switching element Q3 has a gate connected to the drive terminal Mn11 (n is any one of 1 to 3) of the pulse controller 11, a source connected to the power supply + Vcc, a drain connected to the drain of the switching element Q1, and one end of the resistor R1. The comparator Q7 is connected to the first input part (+) and the first output terminal Outn1.
The switching element Q1 has a gate connected to the drive terminal Mn12 of the pulse controller 11 and a source grounded.

  The switching element Q5 has a gate connected to the control terminal Gn1 of the pulse controller 11, a source connected to the power supply + Vcc, and a drain connected to the other end of the resistor R1.

The switching element Q4 has a gate connected to the drive terminal Mn21 of the pulse control unit 11, a source connected to the power supply + Vcc, a drain connected to the drain of the switching element Q2, one end of the resistor R2, and a second input part (+ ) And the second output terminal Outn2.
The switching element Q2 has a gate connected to the drive terminal Mn22 of the pulse controller 11 and a source grounded.

  The switching element Q6 has a gate connected to the control terminal Gn2 of the pulse controller 11, a source connected to the power supply + Vcc, and a drain connected to the other end of the resistor R2.

  In the comparator Q7, the reference voltage Vcomp is supplied to the third input section (−), and the output section is connected to the detection terminal CON of the pulse control section 11.

  The motor 20 is connected to both ends of the first output terminal Outn1 and the second output terminal Outn2 of the pointer driving unit 121.

Each of the switching elements Q3, Q4, Q5, and Q6 is, for example, a P-channel FET (Field Effect Transistor). Each of the switching elements Q1, Q2 is, for example, an N-channel FET.
The switching elements Q1 and Q2 are components that drive the motor 20. Switching elements Q5 and Q6, resistor R1, and resistor R2 are components for detecting rotation. The switching elements Q3 and Q4 are components that are used both for driving the motor 20 and for detecting rotation. Each of the switching elements Q1 to Q6 is an element having a low on-resistance and a low impedance in the on state. The resistance values of the resistors R1 and R2 are the same, and are larger than the on-resistance of the switching element.

  The pointer driving unit 121 supplies the current in the positive direction to the driving coil 209 included in the motor 20 by simultaneously turning on the switching elements Q1 and Q4 and simultaneously turning off the Q2 and Q3. The motor 20 is driven to rotate 180 degrees in the positive direction. In addition, the pointer driving unit 121 supplies the current in the reverse direction to the driving coil 209 by turning on the switching elements Q2 and Q3 at the same time and turning off Q1 and Q4 at the same time. It is further rotated 180 degrees in the direction.

Next, an example of the drive signal output by the pulse control unit 11 will be described.
FIG. 4 is a diagram illustrating an example of drive pulses output by the pulse control unit 11 according to the present embodiment. In FIG. 4, the horizontal axis represents time, and the vertical axis represents whether the signal is at the H (high) level or the L (low) level. A waveform P1 is a waveform of the first drive pulse. A waveform P2 is a waveform of the second drive pulse.

The period from time t1 to t6 is a period in which the motor 20 is rotated forward. During the period from time t1 to time t2, the pulse control unit 11 generates the first drive pulse Mn1. During the period from time t3 to time t4, the pulse controller 11 generates the second drive pulse Mn2. The drive signal during the period from time t1 to t2 or from time t3 to t4 is composed of a plurality of pulse signals as in the region indicated by reference numeral g31, and the pulse controller 11 adjusts the duty of the pulse. In this case, the period from time t1 to t2 or the period from time t3 to t4 changes according to the duty of the pulse. Hereinafter, in the present embodiment, the signal wave in the region indicated by reference numeral g31 is referred to as a “comb tooth wave”. Alternatively, the drive signal during the period from time t1 to t2 or from time t3 to t4 is configured by one pulse signal as in the region indicated by reference numeral g32, and the pulse controller 11 adjusts the pulse width. In this case, the period from time t1 to t2 or the period from time t3 to t4 changes according to the width of the pulse. Hereinafter, in the present embodiment, the signal wave in the region indicated by the symbol g32 is referred to as a “rectangular wave”.
In the present embodiment, the pulse in the period from time t1 to t2 or from time t3 to t4 is referred to as main drive pulse P1. In the following description, an example in which the main drive pulse P1 is a comb tooth wave will be described.

The auxiliary drive pulse P2 during the period from time t5 to time t6 is a drive pulse that is output only when it is detected by the main drive pulse P1 that the rotor has not rotated.
In the embodiment, the state in which the pointer 40 is moved by the main drive pulse (detection drive pulse) without using the auxiliary drive pulse is referred to as a first rotation state. Furthermore, the state in which the pointer is moved using the auxiliary drive pulse after the first rotation state is referred to as the second rotation state.

Next, a configuration example of the motor 20 will be described.
FIG. 5 is a diagram illustrating a configuration example of the motor 20 according to the present embodiment.
When the motor 20 is used in an analog electronic timepiece, the stator 201 and the magnetic core 208 are fixed to a base plate (not shown) with screws (not shown) and joined to each other. The drive coil 209 has a first terminal OUT1 and a second terminal OUT2.

  The rotor 202 is magnetized to two poles (S pole and N pole). A plurality (two in this embodiment) of notches (outer notches) 206 and 207 are provided on the outer end portion of the stator 201 formed of a magnetic material at positions facing each other with the rotor accommodating through hole 203 interposed therebetween. It has been. Saturable portions 210 and 211 are provided between the outer notches 206 and 207 and the rotor accommodating through hole 203.

  The saturable portions 210 and 211 are configured so as not to be magnetically saturated by the magnetic flux of the rotor 202 but to be magnetically saturated when the drive coil 209 is excited to increase the magnetic resistance. The rotor accommodating through-hole 203 is formed in a circular hole shape in which a plurality of (two in this embodiment) half-moon cutout portions (inner notches) 204 and 205 are integrally formed at the opposing portion of the through-hole having a circular outline. Has been.

The notches 204 and 205 constitute a positioning part for determining the stop position of the rotor 202. When the drive coil 209 is not excited, the rotor 202 is positioned corresponding to the positioning portion as shown in FIG. 5, in other words, the magnetic pole axis A of the rotor 202 is a line connecting the notches 204 and 205. It is stably stopped at a position (angle θ ₀ position) orthogonal to the minute. An XY coordinate space centered on the rotation axis (rotation center) of the rotor 202 is divided into four quadrants (first quadrant I to fourth quadrant IV).

Here, a rectangular main drive pulse is supplied from the pointer drive unit 121 between the terminals OUT1 and OUT2 of the drive coil 209 (for example, the first terminal OUT1 side is positive and the second terminal OUT2 side is negative), and FIG. When the drive current i is supplied in the direction of the arrow, magnetic flux is generated in the stator 201 in the direction of the broken arrow. As a result, the saturable portions 210 and 211 are saturated and the magnetic resistance is increased, and then the rotor 202 rotates 180 degrees in the direction of the arrow in FIG. 5 due to the interaction between the magnetic pole generated in the stator 201 and the magnetic pole of the rotor 202. and, the magnetic pole axis is stably stopped at an angle theta ₁ position. The rotation direction (counterclockwise direction in FIG. 5) for causing the normal operation (in this embodiment, the hand movement operation because it is an analog electronic timepiece) by rotating the stepping motor 107 is the forward direction and vice versa. The (clockwise direction) is the reverse direction.

A main driving pulse having a reverse polarity rectangular wave is supplied from the pointer driving unit 121 to the terminals OUT1 and OUT2 of the driving coil 209 (the first terminal OUT1 side has a negative polarity and a second polarity so that the polarity is opposite to that of the driving). When the drive current i is passed in the direction indicated by the arrow in FIG. Thereby, the saturable portions 210 and 211 are first saturated, and then the rotor 202 rotates 180 degrees in the same direction (positive direction) as described above due to the interaction between the magnetic pole generated in the stator 201 and the magnetic pole of the rotor 202. polar axis is stably stopped at an angle theta ₀ position.

Thereafter, the pointer driving unit 121 supplies signals (alternating signals) having different polarities to the driving coil 209 in this way. Thereby, the motor 20 is configured such that the above operation is repeated and the rotor 202 can be continuously rotated in the direction of the arrow by 180 degrees.
The pointer driving unit 121 rotates the motor 20 by alternately driving with driving pulses P1 having different polarities, and when the driving cannot be performed with the main driving pulse P1, the main driving pulse is after a section T3 described later. It is rotationally driven using an auxiliary drive pulse P2 having the same polarity as P1.

  Next, an example of the operation of the switching elements Q1 to Q6 when driving the motor 20 and an induced voltage generated when the motor rotates will be described. In the following example, the case where the motor 20 is rotating forward will be described.

FIG. 6 is a diagram illustrating an example of the main drive pulse P1 and the induced voltage generated when the motor rotates according to the present embodiment. In FIG. 6, the horizontal axis represents time, and the vertical axis represents whether the signal is at H level or L level. A waveform g11 is a waveform of the main drive pulse P1 and the detection pulse output from Outn1 of the pointer drive unit 121. A symbol g12 indicates a detection interval. A waveform g13 is a waveform of the control signal Mn11 input to the gate of the switching element Q3. A waveform g14 is a waveform of the control signal Mn12 input to the gate of the switching element Q1. A waveform g15 is a waveform of the control signal Mn21 input to the gate of the switching element Q4. A waveform g16 is a waveform of the control signal Mn22 input to the gate of the switching element Q2. A waveform g17 is a waveform of the control signal Gn1 input to the gate of the switching element Q5. A waveform g18 is a waveform of the control signal Gn2 input to the gate of the switching element Q6.
In addition, the state shown in FIG. 6 is a state of the period of time t1-t3 in FIG.

In FIG. 6, the switching elements Q3, Q4, Q5, and Q6 are turned on when the signal input to the gate is at the L level, and are turned off when the signal input to the gate is at the H level. . The switching elements Q1 and Q2 are turned on when the signal input to the gate is H, and are turned off while the signal input to the gate is L level.
A period from time ta to tb is a drive section.
Moreover, the period of time tb-tc is a rotation state detection area.

  As shown in the waveform g13 and the waveform g14 during the period from ta to tb which is the driving section, the pulse control unit 11 turns on the switching elements Q3 and Q1 in a predetermined cycle according to the main driving pulse P1 which is a comb wave. By switching to the off state, the motor 20 is controlled to rotate in the forward direction. When the motor 20 is able to rotate normally, the rotor included in the motor 20 rotates 180 degrees in the forward direction. During this period, each of the switching elements Q2, Q5, and Q6 is in an off state, and the switching element Q4 is in an on state.

During the period from the time tb to tc of the detection section, the pulse control unit 11 maintains the switching element Q1 in the off state, and switches the switching element Q3 between the on state and the off state at a predetermined timing so as to be in a high impedance state. Control. And the pulse control part 11 is controlled to switch this detection area and the switching element Q5 to an ON state. During the detection period, the pulse controller 11 maintains the switching element Q4 in the on state and controls the switching elements Q2 and Q6 in the off state.
Thus, in the detection period, a detection loop in which the switching elements Q4 and Q5 are turned on and the switching element Q3 is turned off and a closed loop in which the switching elements Q4 and Q5 are turned on and the switching element Q3 is turned on have a predetermined cycle. Is repeated alternately. At this time, since the detection loop is configured by the switching elements Q4 and Q5 and the resistor R1, the motor 20 is not braked. On the other hand, in the closed loop state, the switching coil Q3, Q4 and the drive coil 209 included in the motor 20 constitute a loop, so that the drive coil 209 is short-circuited. Vibration is suppressed.

  An induced current flows through the detection section and resistor R1 in the same direction as the drive current. As a result, an induced voltage signal VRs is generated in the resistor R1. The comparator Q7 compares the induced voltage signal VRs with the reference voltage Vcomp for each of the sections T1, T2, and T3, and indicates “1” when the induced voltage signal VRs is equal to or lower than the reference voltage Vcomp. When the induced voltage signal VRs is larger than the reference voltage Vcomp, a signal indicating “0” is output. As will be described later with reference to FIG. 7, the section T1 is the first section in the detection section. The section T2 is the second section in the detection section. The section T3 is the third section in the detection section.

  During the period from time t3 to time t5 in FIG. 4, the second drive pulse is generated. Thereby, the drive section and pulse control unit 11 controls the motor 20 to rotate in the forward direction by switching the switching elements Q4 and Q2 between the on state and the off state at a predetermined cycle according to the main drive pulse P1. . During this period, each of the switching elements Q1, Q5, and Q6 is in an off state, and the switching element Q3 is in an on state.

  Then, the detection section and pulse control unit 11 maintains the switching element Q2 in the off state, and controls the switching element Q4 to switch between the on state and the off state at a predetermined timing so as to be in a high impedance state. And the pulse control part 11 is controlled to switch this detection area and the switching element Q6 to an ON state. During the detection period, the pulse controller 11 maintains the switching element Q3 in the on state and controls the switching elements Q1 and Q5 in the off state. Thereby, an induced current flows through the resistor R2 in the same direction as the drive current. As a result, an induced voltage signal VRs is generated in the resistor R2. The comparator Q7 compares the induced voltage signal VRs with the reference voltage Vcomp for each of the sections T1, T2, and T3, and indicates “1” when the induced voltage signal VRs is equal to or lower than the reference voltage Vcomp. A signal is output, and a signal indicating “0” is output when the induced voltage signal VRs is greater than the reference voltage Vcomp.

Next, the relationship between the load state and the induced voltage will be further described with reference to FIG.
FIG. 7 is a diagram for explaining the relationship between the load state and the induced voltage according to the present embodiment. In FIG. 7, reference symbol P1 indicates a drive pulse P1. A symbol T1 indicates a section T1. A symbol T2 indicates a section T2. A symbol T3 indicates a section T3. Waveforms g201 to g204 are waveforms that schematically show the signal CO1 and the driving pulse P1 input to the comparator Q7.

  When the load applied to the motor 20 is normal (normal load), as shown in the waveform g201, the induced voltage signal VRs is equal to or higher than the reference voltage Vcomp in the section T2. For this reason, the output of the comparator Q7 is “0” in the section T1, “1” in the section T2, and “−” in the section T3. Note that “−” indicates that it may be “0” or “1”.

  When the load applied to the motor 20 is small (low load), as shown in the waveform g202, the induced voltage signal VRs is equal to or higher than the reference voltage Vcomp in the sections T1 and T2. For this reason, the output of the comparator Q7 is “1” in the section T1, “1” in the section T2, and “−” in the section T3.

  When the load applied to the motor 20 is large (the load is large), as shown in the waveform g203, the induced voltage signal VRs is equal to or higher than the reference voltage Vcomp in the sections T1 and T3. For this reason, the output of the comparator Q7 is “−” in the section T1, “0” in the section T2, and “1” in the section T3.

When the motor 20 cannot rotate (non-rotation), as shown in the waveform g204, the induced voltage signal VRs is equal to or higher than the reference voltage Vcomp during the section T1. For this reason, the output of the comparator Q7 is “−” in the section T1, “0” in the section T2, and “0” in the section T3.
Note that the pulse control unit 11 performs control so that the main drive pulse P1 is rotationally driven by the auxiliary drive pulse P2 having the same polarity as the main drive pulse P1 when the non-rotation state is detected by the main drive pulse P1.

That is, the load state of the motor 20 and the non-rotation state can be detected by the combination of the outputs of the sections T1 to T3 of the comparator Q7.
Note that the storage unit 5 stores the output of the comparator Q7 in the section T1 to T3 in the region surrounded by the symbol g211 in FIG. 7 and the load state and rotation state of the region surrounded by the symbol g212 in association with each other. .

Next, an outline of the procedure in which the control unit 10 detects the pointer position based on the output of the comparator Q7 by changing the pulse magnitude (pulse duty) of the drive pulse P1 which is a comb tooth wave. explain.
FIG. 8 is a diagram for explaining the outline of the procedure for detecting the pointer position according to the present embodiment. The control unit 10 initializes the settings of the following processing every predetermined time (for example, once a day), for example, when the battery 2 is replaced or when the power is turned on for the first time. When this occurs, the needle position detection operation mode for detecting the position of the pointer 40 is performed. Note that the search pulse used for detecting the reference position of the pointer 40 is stored in the storage unit 5. Further, as shown in FIG. 8, the search pulse is a main drive pulse for detecting the reference position, and is composed of a plurality of pulses having different pulse sizes (duties). The search pulse is a detection drive pulse based on the main drive pulse.

The pulse controller 11 outputs a pulse signal for one rotation of the pointer 40 based on the initial value of the main drive pulse P1 to the pointer driver 121.
And the pulse control part 11 acquires the output of the comparator Q7 in the section T1-T3 after outputting a pulse signal for one round of a pointer. For example, when the pointer 40 is a second hand, the pulse control unit 11 performs control so that the pulse signal is output 60 times. The pulse control unit 11 causes the storage unit 5 to store the output of the comparator Q7 in the sections T1 to T3 for each number of pulses. Specifically, the pulse control unit 11 stores the first pulse in association with “0” in the section T1, “1” in the section T2, and “0” in the section T3, and stores the second pulse. In addition, “0” for the section T1, “1” for the section T2, and “0” for the section T3 are stored in association with each other.

  The pulse control unit 11 compares the acquired combination of the outputs of the comparator Q7 in the sections T1 to T3 with the pattern of the output of the comparator Q7 in the sections T1 to T3 stored in the storage unit 5 to determine the state of the motor 20 Is detected. The state of the motor 20 means whether the motor 20 has a small load (low load), whether it has a large load (large load), or whether it is in a non-rotating state.

  The pulse controller 11 changes the magnitude of the main drive pulse based on the detection result. In the present embodiment, the process of increasing the L level of the main drive pulse or the process of increasing the pulse width is referred to as pulse up (pulse UP). In the present embodiment, the process of reducing the L level length of the drive pulse or the process of reducing the pulse width is called pulse down (pulse DOWN).

When the pulse control unit 11 changes the magnitude of the pulse, the output state of the comparator Q7 for each position of the pointer 40 in one round (360 degrees) of the pointer 40 changes.
If the train wheel 30 has no component that varies in load, the normal load state (section T1 is “0”, section T2 is “1”, section T3 is “ 0 ") is repeated 60 times.

  In the present embodiment, as described above, since there are components that change the load in the train wheel 30, the load is changed at one place while the pointer 40 rotates 360 degrees. For this reason, even in the normal state, if the magnitude of the search pulse is appropriate, the load becomes large at a position where there is a component whose load fluctuates in the train wheel 30, and the section T2 is “0” and the section T3 is “1”. become. As described above, the position where the load becomes large in one round of the pointer 40 is the detection position of the pointer. Specifically, the position where the section T2 is detected as “0” and the section T3 is detected as “1” is the reference position. In the present embodiment, detecting the position where the load increases in this way is referred to as needle position detection.

If the pulse is too large (the length of the L level of the pulse is increased), the rotor 202 is likely to rotate, so that the load is difficult to detect and the reference position is difficult to detect. Thus, when the load is no longer detected, the pulse control unit 11 performs pulse down.
On the other hand, if the pulse is made too small (the length of the L level of the pulse is reduced), the rotor 202 is difficult to rotate and the load becomes large, so that a large load state occurs a plurality of times. Thus, when a load is detected twice or more, the pulse control unit 11 performs pulse-up.

  Thereby, in this embodiment, the pointer 40 is moved once (360 degrees), the detection results of the sections T1 to T3 during the movement are acquired, and the reference position of the pointer 40 is detected based on the acquired result. Can do. In the present embodiment, it is desirable to detect the needle position with the main drive pulse that does not enter the non-rotating state even when performing pulse down.

Next, an example of a processing procedure for performing needle position detection will be described.
FIG. 9 is a flowchart illustrating an example of a processing procedure for performing needle position detection according to the present embodiment. The example illustrated in FIG. 9 illustrates an example in which the load at the reference position is larger than the load at other positions.

(Step S1) The pulse controller 11 sets the main drive pulse to the initial state.
(Step S2) The pulse control unit 11 generates a main drive pulse so as to move the pointer 40 by one round (360 degrees), and controls the pointer drive unit 121 based on the generated main drive pulse. Subsequently, the pointer driving unit 121 drives the motor 20 to move the pointer 40 for one round (360 degrees).

  (Step S3) The pulse control unit 11 acquires the output of the motor load detection unit 122 for each of the section T1, the section T2, and the section T3 for one round. Note that the pulse control unit 11 causes the storage unit 5 to store the output of the motor load detection unit 122 in each of the sections T1 to T3 for each number of pulses.

  (Step S4) After the end of one round of hand movement, the pulse controller 11 determines whether or not the section T1 is “0” and the section T2 is “1” in all regions (for example, one round of 0 to 359 degrees). Determine whether. When it is determined that the section T1 is “0” and the section T2 is “1” in all the regions (step S4; YES), the pulse control unit 11 proceeds to the process of step S5. When it is determined that the section T1 is “0” and the section T2 is not “1” in all the regions (step S4; NO), the pulse control unit 11 proceeds to the process of step S6.

  (Step S5) When the section T1 is “0” and the section T2 is “1” in all the areas, all the areas are in a normal load state, there is a margin in rotation, and the load cannot be detected. It is. In this case, in order to easily detect the load, it is necessary to make it difficult to rotate. For this reason, the pulse control unit 11 is pulse-down by one. That is, the pulse control unit 11 reduces the length of the L level of the main drive pulse by one. In other words, the pulse control unit 11 changes the first energy to the second energy smaller than the first energy. Note that the pulse controller 11 shortens the length of the L level of the main drive pulse by one clock based on the frequency generated by the frequency dividing circuit 4, for example. After the process, the pulse control unit 11 returns the process to step S2.

  (Step S <b> 6) The pulse control unit 11 has a section T <b> 1 of “1” and a section T <b> 2 of “1” (one area), or a section T <b> 2 of “0” and a section T <b> 3 of “1” (one) ( If it is one area) (step S6; YES), the process proceeds to step S7. In the pulse control unit 11, the section T1 is “1” and the section T2 is “1” at a plurality of places (plural areas), or the section T2 is “0” and the section T3 is “0” at a plurality of places (plural areas). If “1” (step S6; NO), the process proceeds to step S8.

  (Step S <b> 7) The pulse control unit 11 has “1” in the section T <b> 1 and “1” in the section T <b> 1 (one area), or “0” in the section T <b> 2 and “1” in the section T <b> 1 (one area). In the case of one region), the position where the load is detected is specified as the reference position and stored in the storage unit 5. After the specification, the pulse control unit 11 stores the main drive pulse, which is a search pulse when the reference position is specified, in the storage unit 5 as the optimum pulse, and ends the needle position detection process. Note that the pulse control unit 11 may use the drive pulse when the reference position is specified in this way as the drive pulse during normal hand movement.

  (Step S8) The pulse controller 11 determines that the section T1 is “1” and the section T2 is “1” at a plurality of places (plural areas), or the section T2 is “0” at a plurality of places (plural areas). When the section T3 is “1”, the pulse is increased by one. That is, the pulse control unit 11 increases the length of the L level of the main drive pulse by one. In other words, the pulse controller 11 changes the first energy to a third energy that is greater than the first energy. The pulse control unit 11 increases the length of the L level of the main drive pulse by one clock based on the frequency generated by the frequency dividing circuit 4, for example. After the process, the pulse control unit 11 returns the process to step S2.

  When the relative difference between the load at the reference position and the normal position is large due to manufacturing variations and the reference position cannot be detected with the main drive pulse, the pulse control unit 11 detects the reference position using the auxiliary drive pulse to store the storage unit 5. Remember me. As described above, when the reference position is detected using the auxiliary drive pulse (the section T2 is “0” and the section T3 is “0”), the pulse controller 11 detects the reference position and the main drive pulse and the auxiliary drive. The pulse may not be stored in the storage unit 5 as the optimum pulse.

  In the process of FIG. 9, the position where the load is large may extend over two or more steps of the pointer 40. However, when two or more loads are obtained continuously, the pulse controller 11 first detects the load. A position corresponding to the number of generated pulses is detected as a reference position. The position where the load is high and the position where the load is detected are the position where the section T1 is “1” and the section T2 is “1”, or the section T2 is “0” and the section T3 is “1”. .

Here, an overview of the processing of FIG. 9 will be described.
The pulse control unit 11 uses the main drive pulse (first energy) in the initial state to make the pointer 40 go around and acquire the values of the sections T1 to T3. The main drive pulse in the initial state is a main drive pulse used for hand movement or a main drive pulse in which the reference position can be detected last time.
When the pulse controller 11 makes one turn of the pointer 40 with the main drive pulse in the initial state and finds one place where the load increases, that area is the first area (FIG. 2), that is, the reference position. Determine.
If no location where the load increases is found by the main drive pulse in the initial state, the pulse control unit 11 performs pulse down to a state where there is only one location where the load is small or large (FIG. 7). The main drive pulse pulsed down is the second energy, and the main drive pulse further pulsed down from the second energy is the fourth energy.
Further, when the pulse down is performed to the state where the load is small or the load is large, the pulse control unit 11 is not rotated (FIG. 7) using the auxiliary drive pulse. Pulse down until there is only one spot.
Further, as a result of making the pointer 40 go around using the main drive pulse in the initial state, when a plurality of locations having a small load or a large load (FIG. 7) are found, the pulse control unit 11 determines whether the load is small or large (see FIG. 7) Pulse up to a state where there is only one location, and detect the reference position.

  Note that the processing procedure described above is an example, and the processing procedure may be changed according to the application. Alternatively, a lower limit may be provided for pulse down, an upper limit may be provided for pulse up, and the upper limit and lower limit may be stored in the storage unit 5 in advance. As described above, when the upper limit and the lower limit are stored, the pulse control unit 11 returns to the initial state again when the position where the load increases even if the pulse is increased to the upper limit cannot be reduced to one, and returns to the reference position. May be detected, or it may be determined to be abnormal and notified. Alternatively, the pulse control unit 11 returns to the initial state again to detect the reference position when the position where the load increases even if the pulse is lowered to the lower limit cannot be reduced to one, or determines that it is abnormal. You may make it alert | report.

  As described above, according to the present embodiment, the means for the control unit 10 to grasp the reference position of the pointer 40 in the timepiece 1 can be realized by a predetermined load that can be normally operated.

  In the above embodiment, when two or more loads are obtained in succession in the process of FIG. 9, the pulse control unit 11 uses the position corresponding to the number of pulses first detected as a reference position as the reference position. Although it detects, it is not limited to this. When two or more loads are obtained in succession, the pulse control unit 11 may detect a position corresponding to the number of pulses at which the largest load fluctuation is detected as a reference position.

  In the above embodiment, in the process of FIG. 9, when the pulse control unit 11 determines that the section T1 is “0” and the section T2 is “1” in all regions (step S4; YES), The process proceeds to step S5. That is, the control unit 10 performs one pulse down when the load fluctuation is not determined in one round of movement. However, if the load fluctuation is not determined in one round of moving, the control unit 10 may detect the load again in one round of moving without changing the energy of the main drive pulse.

  Furthermore, in the above embodiment, in the processing of FIG. 9, the pulse control unit 11 determines that the section T1 is “1” and the section T2 is “1” at a plurality of locations (plural regions), or a plurality of locations (plural regions). ), When the section T2 is “0” and the section T3 is “1” (step S6; NO), the process proceeds to step S8. That is, the pulse control unit 11 increases the pulse by one when a plurality of load fluctuations are determined in one round of movement. However, the pulse control unit 11 may detect the load again during one round of movement without changing the energy of the main drive pulse when a plurality of non-continuous load fluctuations are determined in one round of movement. .

  The above process will be described in detail with reference to FIG. The processes other than those described below are the same as in the above embodiment.

  (Step S4) When it is determined that the section T1 is “0” and the section T2 is “1” in all regions (step S4; YES), the pulse controller 11 proceeds to the process of step S21.

  (Step S21) The pulse control unit 11 performs a first predetermined number of times (for example, 2) in which the first number of determinations in which it is determined that the section T1 is “0” and the section T2 is “1” in all regions in Step S4. Times). If the pulse control unit 11 determines that the first determination number is the first predetermined number of consecutive times (step S21; YES), the pulse control unit 11 proceeds to the process of step S22. If the pulse control unit 11 determines that the first determination number is not the continuous first predetermined number (step S21; NO), the process returns to step S2.

  (Step S22) The pulse control unit 11 initializes the number of times (first determination number) determined in step S4 that the section T1 is “0” and the section T2 is “1” in all regions. The pulse control unit 11 proceeds to the process of step S5 after the process.

  (Step S <b> 6) The pulse controller 11 determines that the section T <b> 1 is “1” and the section T <b> 2 is “1” at a plurality of places (plural areas), or the section T <b> 2 is “0” at a plurality of places (plural areas) and If the section T3 is “1” (step S6; NO), the process proceeds to step S31.

  (Step S31) In step S6, the pulse controller 11 determines that the section T1 is “1” and the section T2 is “1” at a plurality of places (plural areas), or the section T2 is “1” at a plurality of places (plural areas). It is determined whether or not the second determination number determined to be “0” and the section T3 is “1” is a second predetermined number of consecutive times (for example, two times). When it is determined that the second determination number is the second predetermined number of consecutive times (step S31; YES), the pulse control unit 11 proceeds to the process of step S32. When it is determined that the second determination number is not the second predetermined number of consecutive times (step S31; NO), the pulse control unit 11 returns the process to step S2.

  (Step S32) In step S6, the pulse controller 11 determines that the section T1 is “1” and the section T2 is “1” at a plurality of places (plural areas), or the section T2 is “1” at a plurality of places (plural areas). The number of times determined to be “0” and the section T3 is “1” (second determination number) is initialized. After the process, the pulse control unit 11 proceeds to the process of step S8.

  Here, a case where the reference load portion is provided on the teeth of the first gear and the number of teeth of the first gear is different from the number of teeth of the second gear meshing with the first gear will be described. In this case, the phase of the second gear when the second gear meshes with the reference load portion of the first gear changes every time the first gear rotates once. For this reason, the magnitude | size of the load fluctuation | variation by a reference | standard load part changes with every rotation of a 1st gearwheel by the manufacture dispersion | variation in 2nd gearwheel, aged deterioration, etc. As a result, depending on the phase of the second gear, the control unit 10 may not be able to determine the load fluctuation in one round of movement. Therefore, when the pulse control unit 11 performs the above-described processing of step S21 and step S22, it is determined that the temporary load reduction due to the phase change of the second gear is due to the pulse being too large. This can be suppressed. Therefore, excessive pulse down of the search pulse can be suppressed, and the occurrence of insufficient energy of the optimum pulse can be suppressed.

  Next, a case will be described in which the hand movement torque varies due to foreign matter adhering to the train wheel 30. In this case, the motor load detection unit 122 may detect an increase in load at a period different from the period of one round of the pointer 40. Therefore, when the pulse control unit 11 performs the above-described processing of step S31 and step S32, when the needle movement torque fluctuates in a period larger than the period of one round of the pointer 40 due to a foreign object, the first round of the pointer 40 Even if an increase in load due to a foreign object is detected, detection of an increase in load due to a foreign object can be avoided in the second round. Thereby, it can suppress that the increase in the load accompanying the fluctuation | variation of the needle movement torque by a foreign material is judged as an increase in the load by a reference | standard load part. Therefore, excessive pulse-up of the search pulse can be suppressed and occurrence of excessive energy of the optimum pulse can be suppressed.

  Further, the control unit 10 may invalidate the load fluctuation that occurs in a period different from the period of one round of the pointer 40. For example, the control unit 10 determines the load fluctuation cycle based on the reference position and the cycle stored in the storage unit 5. Thereby, it can suppress that the increase in the load which arises in the period different from the period for one round of the pointer | guide 40 by a foreign material as mentioned above is judged as an increase in the load by a reference | standard load part.

  Note that a program for realizing all or part of the functions of the control unit 10 in the present invention is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed. Accordingly, all or part of the processing performed by the control unit 10 may be performed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer system” includes a WWW system having a homepage providing environment (or display environment). The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

  As mentioned above, although the form for implementing this invention was demonstrated using embodiment, this invention is not limited to such embodiment at all, and various deformation | transformation and substitution are within the range which does not deviate from the summary of this invention. Can be added.

DESCRIPTION OF SYMBOLS 1 ... Clock, 2 ... Battery, 3 ... Oscillator circuit, 4 ... Frequency divider circuit, 5 ... Memory | storage part, 10 ... Control part, 20a ... 1st motor, 20b ... 2nd motor, 20c ... 3rd motor, 30a, 30b , 30c ... wheel train, 40a ... first pointer, 40b ... second pointer, 40c ... third pointer, 11 ... pulse control unit, 12 ... pointer drive unit, 121a ... first pointer drive unit, 122a, 122b, 122c ... Motor load detection unit, 121b ... second pointer drive unit, 121c ... third pointer drive unit

Claims (13)

A stepping motor having a rotor for rotating the pointer;
A reference load portion that is provided at a predetermined position in a drive mechanism including the pointer and the rotor, and that varies the load received by the rotor when the pointer is positioned at a reference position;
The rotor is rotated by the main drive pulse and the auxiliary drive pulse, and the reference of the pointer is detected by detecting the rotation state of the rotor for one cycle in which the pointer rotates at least once by the detection drive pulse based on the main drive pulse. A control unit for determining the position ;
With
The controller is
Induced voltage in at least one of the detection period including the first detection period after the output of the detection drive pulse, the second detection period following the first detection period, and the third detection period following the second detection period Detecting the rotational state of the rotor by detecting
If a load change by the reference load unit is determined only once during the one period based on at least two detection results among the first detection period, the second detection period, and the third detection period, the change Is determined as the reference position,
Watch movement. A stepping motor having a rotor for rotating the pointer;
A reference load portion that is provided at a predetermined position in a drive mechanism including the pointer and the rotor, and that varies the load received by the rotor when the pointer is positioned at a reference position;
The rotor is rotated by the main drive pulse and the auxiliary drive pulse, and the reference of the pointer is detected by detecting the rotation state of the rotor for one cycle in which the pointer rotates at least once by the detection drive pulse based on the main drive pulse. A control unit for determining the position ;
With
The controller is
Induced voltage in at least one of the detection period including the first detection period after the output of the detection drive pulse, the second detection period following the first detection period, and the third detection period following the second detection period Detecting the rotational state of the rotor by detecting
Based on at least two detection results among the first detection period, the second detection period, and the third detection period, when a load variation by the reference load unit is detected at least twice during the one period, Determining the position with the largest load fluctuation as the reference position;
Watch movement. A stepping motor having a rotor for rotating the pointer;
A reference load portion that is provided at a predetermined position in a drive mechanism including the pointer and the rotor, and that varies the load received by the rotor when the pointer is positioned at a reference position;
The rotor is rotated by the main drive pulse and the auxiliary drive pulse, and the reference of the pointer is detected by detecting the rotation state of the rotor for one cycle in which the pointer rotates at least once by the detection drive pulse based on the main drive pulse. A control unit for determining the position ;
With
The controller is
Induced voltage in at least one of the detection period including the first detection period after the output of the detection drive pulse, the second detection period following the first detection period, and the third detection period following the second detection period Detecting the rotational state of the rotor by detecting
Based on at least two detection results of the first detection period, the second detection period, and the third detection period, when at least two load fluctuations by the reference load unit are detected during the one period, The position where the load fluctuation is detected is determined as the reference position.
Watch movement. The controller is
Setting the detection drive pulse to the first energy;
Detecting a rotation state of the rotor over prior Symbol one period,
If the load fluctuation due to the reference load unit is not determined during the one cycle, the detection drive pulse is set to a second energy smaller than the first energy,
Detecting a rotation state of the rotor over the one period by the detecting driving pulse of the second energy,
When a load variation due to the reference load unit is determined twice or more during the one cycle, the detection drive pulse is set to a third energy larger than the first energy,
Detecting the rotational state of the rotor over the one period by the detection drive pulse of the third energy ;
The timepiece movement according to claim 1 . Wherein,
When the load fluctuation due to the reference load unit is not determined during the one cycle, or when the load fluctuation due to the reference load unit is determined two or more times that are not consecutive, the first rotation is performed again without changing the energy of the detection drive pulse. Detecting the rotational state of the rotor over a period of time ;
The timepiece movement according to claim 1 . The controller is
When the first rotation state is detected, the hand is moved by the detection drive pulse, and when the second rotation state is detected, the hand is moved by the detection drive pulse, and then the auxiliary drive pulse is added and the hand is moved. The reference position is determined by determining a load variation by the reference load unit when detecting the second rotation state .
The timepiece movement according to any one of claims 1 to 3 . The controller is
In one position of the front Symbol one period, when detecting an induced voltage based on the reference load unit in the said first detection period second detection period, or based on the reference load portion in the second detection period If the induced voltage based on the reference load portion is detected in the third detection period without detecting the induced voltage, the position is determined to be the reference position.
The timepiece movement according to claim 1 . The control unit stores the detection drive pulse used when the reference position can be determined as an optimum pulse.
The timepiece movement according to any one of claims 1 to 7 . The control unit controls the stepping motor to move the pointer with the optimum pulse.
The timepiece movement according to claim 8 . A timepiece comprising the timepiece movement according to any one of claims 1 to 9 . A stepping motor having a rotor for rotating a pointer, and a reference load portion that is provided at a predetermined position in a drive mechanism including the pointer and the rotor, and that varies the load received by the rotor when the pointer is positioned at a reference position The rotor is rotated by a main drive pulse and an auxiliary drive pulse, and the pointer is detected by detecting the rotation state of the rotor for one cycle in which the pointer rotates at least once by a detection drive pulse based on the main drive pulse. A method for determining a reference position of a pointer of a watch in a timepiece having a control unit for determining a reference position,
The control unit includes at least one detection period including a first detection period after the output of the detection drive pulse, a second detection period following the first detection period, and a third detection period following the second detection period. Detecting a rotational state of the rotor by detecting an induced voltage in two periods;
The control unit determines a load variation due to the reference load unit only once in the one period based on at least two detection results of the first detection period, the second detection period, and the third detection period. And determining the position where the change is determined as the reference position;
Reference position determination method for watch hands including A stepping motor having a rotor for rotating a pointer, and a reference load portion that is provided at a predetermined position in a drive mechanism including the pointer and the rotor, and that varies the load received by the rotor when the pointer is positioned at a reference position The rotor is rotated by a main drive pulse and an auxiliary drive pulse, and the pointer is detected by detecting the rotation state of the rotor for one cycle in which the pointer rotates at least once by a detection drive pulse based on the main drive pulse. A method for determining a reference position of a pointer of a watch in a timepiece having a control unit for determining a reference position,
The control unit includes at least one detection period including a first detection period after the output of the detection drive pulse, a second detection period following the first detection period, and a third detection period following the second detection period. Detecting a rotational state of the rotor by detecting an induced voltage in two periods;
The control unit detects a load fluctuation caused by the reference load unit at least twice during the one period based on at least two detection results of the first detection period, the second detection period, and the third detection period. If determined, the step of determining the position with the largest load fluctuation as the reference position;
Reference position determination method for watch hands including A stepping motor having a rotor for rotating a pointer, and a reference load portion that is provided at a predetermined position in a drive mechanism including the pointer and the rotor, and that varies the load received by the rotor when the pointer is positioned at a reference position The rotor is rotated by a main drive pulse and an auxiliary drive pulse, and the pointer is detected by detecting the rotation state of the rotor for one cycle in which the pointer rotates at least once by a detection drive pulse based on the main drive pulse. A method for determining a reference position of a pointer of a watch in a timepiece having a control unit for determining a reference position,
The control unit includes at least one detection period including a first detection period after the output of the detection drive pulse, a second detection period following the first detection period, and a third detection period following the second detection period. Detecting a rotational state of the rotor by detecting an induced voltage in two periods;
The control unit detects a load fluctuation caused by the reference load unit at least twice during the one period based on at least two detection results of the first detection period, the second detection period, and the third detection period. If it is, the step of determining the position where the load fluctuation is first detected as the reference position;
Reference position determination method for watch hands including

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