JP2016161380A - Movement of electronic timepiece and electronic timepiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic timepiece in which an impact detecting function does not need to be switched between in an operational state and a non-operational state frequently and the time of setting the impact detecting function in the non-operation state can be minimized.SOLUTION: A movement 3 of an electric-wave modifying timepiece 1 has four step motors 31, 32, 33, and 34, the step motor 31 being for a second hand and having an impact detection function for controlling drive by detecting an input of impact and the step motor 32 being for a minute hand. The step motor 31 for a second hand is driven most frequently compared to the step motor 32 for a minute hand and is arranged further from the step motor 32 than the step motors 33 and 34.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a movement of an electronic timepiece and an electronic timepiece.

  The electronic timepiece drives a time indicating hand by a step motor. When an impact is input to the electronic timepiece, a large moment acts on the hands. The pointer of the electronic timepiece is connected to the rotor of the step motor via a train wheel, but the rotor is only held at a predetermined position by the holding force of the step motor. The pointer is misaligned.

By increasing the holding force of the step motor, it may be possible to prevent the displacement of the pointer due to the input of an impact. However, if the holding force is increased, it is necessary to increase the power required to rotate the rotor. is there. For this reason, the power consumption of the step motor is increased, which is not preferable from the viewpoint of energy saving.
In particular, when the holding force of the stepping motor for the second hand, which is frequently driven, is increased, the increase in power consumption becomes a more important problem.

  Therefore, when the impact is input, the pointer is moved, and by detecting the back electromotive force generated in the step motor when the rotor is rotated, the impact input is detected, and the impact input is detected. In such a case, an impact detection function has been proposed that controls the drive to brake the rotor to prevent the displacement of the pointer (see, for example, Patent Document 1).

JP-A-2005-172777

However, the impact detection function may malfunction due to the influence of leakage magnetism generated when another step motor is driven, and may cause an increase in power consumption due to an erroneous output of a control pulse. For this reason, when another step motor is driven, the impact detection function is stopped so as not to be affected by leakage magnetism.
By the way, the impact detection function is added to the step motor for the second hand, but when it is added not only to the step motor for the second hand but also to other step motors, other steps with high driving frequency such as a step motor for the second hand. There is a risk of being affected by the leakage magnetism of the motor.

In order to avoid this situation, it is conceivable to stop the impact detection function only when another step motor is driven. However, if the other stepping motor is a stepping motor with high driving frequency, it is necessary to frequently switch between the operating state and the non-operating state. Increases nature.
The present invention has been made in view of the above circumstances, and it is not necessary to frequently switch the impact detection function between an operation state and a non-operation state, and the electronic timepiece can shorten the time of the non-operation state of the shock detection function. It is an object to provide a movement and an electronic timepiece.

The first aspect of the present invention includes at least three step motors including a step motor to which an impact detection function for controlling driving by detecting an impact input is added, and the step having the highest drive frequency among the step motors. The motor is a movement of an electronic timepiece disposed at a position farther from the step motor to which the impact detection function is added than the other step motors.
A second aspect of the present invention is an electronic timepiece including the movement of the electronic timepiece according to the present invention and a pointer driven by the step motor.

  According to the movement of the electronic timepiece and the electronic timepiece according to the invention, it is not necessary to frequently switch the impact detection function between the operation state and the non-operation state, and the time of the non-operation state of the shock detection function can be shortened. According to the movement of the electronic timepiece and the electronic timepiece according to the present invention, in the case of the optimum example, it is not necessary to switch the impact detection function between the operating state and the non-operating state.

1 is a perspective view showing a radio-controlled timepiece that is an embodiment of an electronic timepiece according to the invention. It is the figure which looked at the electric wave correction timepiece shown in FIG. 1 from the dial side. It is a figure which shows arrangement | positioning of the four step motors in a movement.

Embodiments of an electronic timepiece movement and an electronic timepiece according to the present invention will be described below with reference to the drawings.
<Configuration of radio-controlled watch>
FIG. 1 shows a radio-controlled timepiece 1 which is an embodiment of an electronic timepiece according to the present invention. A movement 3 represented by a solid line through a case 2 represented by a two-dot chain line from the back cover side. It is a perspective view showing the visible state. The top of FIG. 1 is the 12 o'clock direction, and the left is the 3 o'clock direction. FIG. 2 is a view of the radio-controlled timepiece 1 shown in FIG. 1 as viewed from the dial 4 side, and illustration of exterior parts such as the case 2 is omitted.

As shown in FIG. 1, the radio-controlled timepiece 1 has a movement 3 housed in a conductive metal case 2. The radio-controlled timepiece 1 has a function of receiving a radio wave including time information (for example, a GPS signal including time information transmitted from a GPS satellite) and automatically correcting a time display hand to a correct position.
As shown in FIG. 2, the radio-controlled timepiece 1 includes an hour hand 5a, a minute hand 5b, and a second hand 5c, which are examples of hands that rotate clockwise around the center of the dial 4. In addition, a dual minute lowercase letter plate 4a is formed at the 6 o'clock direction portion of the dial plate 4 to indicate a time and time different from the time indicated by the hour hand 5a and the minute hand 5b in a 24-hour display. Corresponding to the dual minute hour and small letter plate 4a, the radio-controlled timepiece 1 includes a dual hour hand 5d and a dual minute hand 5e.

Further, the portion of the dial 4 in the 9 o'clock direction indicates the day of the week (S, M, T, W, T, F, S), and the daylight saving time (SMT) is on (ON) and off (OFF). The function display lower-case plate 4b is formed to indicate the selected state of the battery or to indicate the remaining charge of the battery. Corresponding to the function display lower-case plate 4b, the radio-controlled timepiece 1 includes a function display hand 5f.
Further, a function switching lower-case letter plate 4c for switching the functions displayed by the hour hand 5a, the minute hand 5b, the second hand 5c, the dual hour hand 5d, the dual minute hand 5e, and the function display hand 5f is formed in the portion of the dial 4 in the 3 o'clock direction. ing. Corresponding to the function switching lower-case plate 4c, the radio-controlled timepiece 1 includes function switching hands 5g.

  The hour hand 5a, the minute hand 5b, the second hand 5c, the dual hour hand 5d, the dual minute hand 5e, and the function display hand 5f are step motors 31, 32, 33, and 34 provided in the movement 3, as will be described later (see FIG. 3 to be described later). The function switching needle 5g is rotationally driven by manually operating a crown (not shown).

  In the portion between the 4 o'clock direction and the 5 o'clock direction of the dial 4, the date letters (“7” in the example of FIG. 3) 6 written on the date plate arranged on the back side of the dial 4 The date window 4d for exposing the camera is opened.

<Composition of movement>
FIG. 3 is a diagram showing the arrangement of the four step motors 31, 32, 33, 34 in the movement 3, as viewed from the back side of FIG. 2.
The movement 3 is an embodiment of the movement of the electronic timepiece according to the invention. The movement 3 includes four step motors 31, 32, 33, and 34 as shown in FIG.

The step motor 31 arranged corresponding to the direction from 3 o'clock to 4 o'clock of the dial 4 (see FIG. 2) of the radio-controlled timepiece 1 is a second hand step motor for rotating the second hand 5c. Hereinafter, the step motor 31 is referred to as a second hand step motor 31. The second hand step motor 31 is driven at a cycle (frequency) once per second.
The step motor 32 arranged corresponding to the direction from 8 o'clock to 9 o'clock of the dial 4 is a minute hour hand motor for rotating the hour hand 5a and the minute hand 5b. Hereinafter, the step motor 32 is referred to as a minute hour hand step motor 32. The minute hand step motor 32 is driven at a cycle (frequency) of once every 10 seconds. The minute hand step motor 32 has two coils 32a and 32b.

The step motor 33 arranged corresponding to the 6 o'clock direction of the dial 4 is a dual minute hour hand motor that rotates the dual hour hand 5d and the dual minute hand 5e. Hereinafter, this step motor 33 is referred to as a dual minute hour hand step motor 33. The dual minute hour hand step motor 33 is driven at a cycle (frequency) once per minute.
The step motor 34 arranged corresponding to the direction from 9 o'clock to 10 o'clock of the dial 4 is a function display hand step motor for rotating the function display hand 5f. Hereinafter, the step motor 34 is referred to as a function indicating needle step motor 34. The function indicating hand step motor 34 is driven once a day (frequency) for displaying the day of the week. Note that when another function displayed by the function display hand 5f is used, the function is also driven when the function is used.

The second hand step motor 31 and the minute hour hand step motor 32 are provided with an impact detection function for controlling driving by detecting an impact input to the respective step motors 31 and 32.
Specifically, the impact detection function is a function for preventing the pointer from moving due to the impact when an impact is input by dropping the radio-controlled timepiece 1 or the like. The impact detection function detects, for example, the movement of the rotor of the stepping motor that drives the pointer when the pointer is moved by the input of the impact by detecting the counter electromotive force, and when the counter electromotive force is detected, the step is detected. This is realized by controlling the drive so as to brake the rotor of the motor.

  Therefore, each step motor to which an impact detection function is added, for example, an impact detection circuit that detects an impact input by detecting a back electromotive force, and drives the rotor to brake when the impact input is detected. And a control circuit for controlling. In the present embodiment, the second hand step motor 31 and the minute hand step motor 32 are controlled by an IC 39 having the functions of the impact detection circuit and the control circuit, and the above-described impact detection function is added.

The movement 3 includes a base plate 7, a train wheel mechanism (not shown), a train wheel bridge, a circuit board on which a circuit such as an IC 39 is formed, a circuit holding plate, two anti-magnetic plates, an antenna for receiving radio waves, and a buzzer coil. Etc.
The train wheel mechanism is rotatably supported by the main plate 7 and the train wheel receiver, and the pointers corresponding to the step motors 31 to 34 (second hand 5c, minute hand 5b, hour hand 5a, dual hour hand 5d, dual minute hand 5e, function It is connected to the indicator hand 5f).
The train wheel mechanism is disposed in a train wheel recess 7a or the like that is formed to be recessed in order to dispose the train wheel mechanism on the main plate 7. A part of the train wheel recess 7 a is formed between the minute hour hand step motor 32 and the second hand step motor 31. Therefore, a part of the train wheel mechanism is arranged between the minute hour hand step motor 32 and the second hand step motor 31.

The antenna for receiving radio waves is, for example, a rectangular patch antenna in plan view. This antenna is disposed in an antenna recess 7b or the like that is formed to be recessed in order to dispose the antenna on the ground plane 7.
The buzzer coil is sounded when the alarm (ALM) displayed on the function switching lowercase plate 4c is set. The buzzer coil is disposed in a buzzer coil recess 7c formed in a concave shape in order to dispose the buzzer coil on the base plate 7. The buzzer coil recess 7c is formed in a space around the antenna recess 7b.

Here, the distance between the minute hand step motor 32 and the second hand step motor 31 is L1, the distance between the minute hand step motor 32 and the dual minute hand step motor 33 is L2, and the minute hand step motor. When the distance between the step 32 and the function indicating hand step motor 34 is L3, these distances L1, L2, and L3 have the following magnitude relationship.
L1> L2, L3
That is, when viewed from the minute hour hand step motor 32, the second hand step motor 31 is arranged at the farthest position, and the dual minute hour hand step motor 33 and the function display hand step motor 34 are arranged at the next far position. Yes.

<Operation of the movement>
According to the radio-controlled timepiece 1 and the movement 3 of the present embodiment configured as described above, the drive frequency of the other step motors 31, 33, 34 from the minute hour hand step motor 32 to which the impact detection function is added. The second hand step motor 31 having the highest is disposed at the farthest position (position of the distance L1).

The minute hand stepping motor 32 is unlikely to be affected by leakage magnetism during driving from the second hand stepping motor 31 arranged at the farthest position in this way. Therefore, every time the second hand step motor 31 is driven, the minute hour hand step motor 32 operates normally without changing the shock detection function added to the minute hour hand step motor 32 to the non-operating state. Can be made.
As a result, the radio-controlled timepiece 1 and the movement 3 of the present embodiment can operate the impact detection function added to the minute hour hand step motor 32 without frequently stopping it, and the impact detection function is not operating. Can be shortened.

In the radio-controlled timepiece 1 and the movement 3 of the present embodiment, the other step motors 31, 33, 34 except for the minute hand step motor 32 to which the impact detection function is added are arranged in descending order of drive frequency (for second hand). Step motor 31, dual minute hour hand step motor 33, and function display hand step motor 34), that is, farther away from the minute hour hand step motor 32 to which the impact detection function is added, in the descending order of occurrence of leakage magnetism. By arranging at the position (distance L1>L2> L3), the frequency of stopping the impact detection function of the minute hour hand stepping motor 32 can be minimized.
According to the radio-controlled timepiece 1 and the movement 3 of the present embodiment, it is not necessary to stop the impact detection function in the optimum case, and it is not necessary to switch the impact detection function between the operating state and the non-operating state.

In the radio-controlled timepiece 1 and the movement 3, a radio wave generated by an antenna such as a gear train mechanism is provided between the minute hour hand step motor 32 and the second hand step motor 31 having the highest driving frequency (the gear train recess 7a). It is preferable to dispose only the operation member that does not affect the reception of the step motor and not to dispose the step motor.
However, the arrangement of another step motor between the minute hour hand step motor 32 and the second hand step motor 31 having the highest driving frequency is not completely excluded. As described above, when other step motors are arranged, it is preferable to arrange the step motors such as step motors 33 and 34 having a lower drive frequency than others.

In addition to the train wheel mechanism, an operating member such as an antenna for receiving radio waves may be disposed between the minute hand step motor 32 and the second hand step motor 31 having the highest driving frequency. When the antenna is arranged, the antenna recess 7b for arranging the antenna may be formed on the ground plane 7 between the minute hour hand step motor 32 and the second hand step motor 31 having the highest driving frequency.
In the case where an antenna is disposed between the minute hour hand step motor 32 and the second hand step motor 31 having the highest driving frequency, when the radio wave is received by the antenna, the second hand step motor 31 and the minute hour hand step motor 32 It is preferable to stop driving.

The radio-controlled timepiece 1 and the movement 3 of the present embodiment have two step motors (second step motor 31 for minute hand and step motor 32 for minute hour hand) to which an impact detection function is added, as viewed from the step motor 32 for minute hour hand. The second hand step motor 31 is disposed farther than the other step motors 33 and 34. Therefore, mutual interference between the impact detection functions of the two step motors 31 and 32 can be prevented.
In addition, the radio-controlled timepiece 1 and the movement 3 according to the present embodiment can prevent the influence of leakage magnetism of pulses output when the step motors 31 and 32 to which the impact detection function is added are braked.

  The radio wave correction timepiece 1 and the movement 3 of the present embodiment are provided with an impact detection function by the second hand step motor 31 and the minute hour hand step motor 32. Therefore, the hour hand 5a and the minute hand 5b for indicating the time. And all the position shifts of the second hand 5c can be prevented without increasing the power consumption.

In the radio-controlled timepiece 1 and the movement 3 of the present embodiment, the minute hand stepping motor 32 has two coils 32a and 32b. By controlling the two coils 32a and 32b to drive one rotor, the rotor is rotated in the forward rotation direction (clockwise direction) and when it is rotated in the reverse rotation direction (counterclockwise direction). , The rotation speed can be the same.
Therefore, for example, in order to adjust the time difference between cities in the world, the speed at which the minute hand 5b and hour hand 5a are advanced and the speed at which the minute hand 5b is advanced by the minute hour hand step motor 32 can be made the same, thereby improving operability. it can.

In the radio-controlled timepiece 1 and the movement 3 of the present embodiment, the second hand step motor 31 is arranged corresponding to the direction between 3 o'clock and 4 o'clock of the dial 4, and the minute hand step motor 32 is 8 o'clock of the dial 4. Is arranged corresponding to the direction between 9 o'clock and 9 o'clock.
Generally, since a pointer is not disposed at a position near 4 o'clock or a position near 8 o'clock of the dial plate 4, a wheel train mechanism connected to the pointer is not disposed, and a dead space is likely to occur.

On the other hand, the radio-controlled timepiece 1 and the movement 3 according to the present embodiment have the second hand step motor 31 disposed at a position near 4 o'clock of the dial 4 that tends to become dead space, and the dial that tends to become dead space. A minute hand step motor 32 is arranged at a position near 4 o'clock at 4 o'clock.
Therefore, the radio-controlled timepiece 1 and the movement 3 of the present embodiment can effectively use the dead space.

Further, in the radio-controlled timepiece 1 and the movement 3 of the present embodiment, the position near 4 o'clock and the position near 8 o'clock where the two step motors 31 and 32 to which the impact detection function is added are arranged are the positions of the movement 3. The positions are almost diagonal to each other across the center.
Therefore, according to the radio-controlled timepiece 1 and the movement 3 of the present embodiment, the two step motors 31 and 32 to which the impact detection function is added are arranged away from each other in a limited space in the movement 3. Can do.

Note that the radio-controlled timepiece 1 and the movement 3 of the present embodiment have a combination of two step motors 31 and 32 to which an impact detection function is added, a combination of a position near 4 o'clock and a position near 8 o'clock. The arrangement of the two step motors to which the impact detection function is added in the electronic timepiece and the movement of the electronic timepiece according to the present invention is not limited to the combination of positions in this embodiment.
Therefore, in the radio-controlled timepiece 1 and the movement 3 of the present embodiment, the two step motors 31 and 32 to which the impact detection function is added, such as by placing an antenna or the like at another position, It is good also as arrangement | positioning of the combination called the position of 6 o'clock vicinity. Moreover, it is good also as arrangement | positioning of the combination of another position.

  In the radio-controlled timepiece 1 and the movement 3 according to the present embodiment, the buzzer coil concave portion 7c is formed around the antenna concave portion 7b of the base plate 7, and therefore the buzzer coil is disposed around the antenna. Since the antenna is a rectangular patch antenna and the movement 3 has a circular outer periphery, the periphery of the antenna is a dead space. Since the buzzer coil is disposed in a dead space formed around the antenna, the radio-controlled timepiece 1 and the movement 3 can increase the use efficiency of the space in the movement 3.

  The radio-controlled timepiece 1 and the movement 3 of the present embodiment have two step motors to which an impact detection function is added, but are not limited to those having two step motors to which an impact detection function is added, and have one or more. Anything is acceptable. Therefore, also in the present embodiment, the second hand step motor 31 may be a step motor having no impact detection function.

In the radio-controlled timepiece 1 and the movement 3 of this embodiment, an impact detection function is also added to the second hand step motor 31. When viewed from the second hand step motor 31, the step motor arranged at the farthest position is a function display hand step motor 34.
However, the function indicating hand step motor 34 has an extremely low driving frequency compared with the other remaining step motors (the minute hour hand step motor 32 and the dual minute hour hand step motor 33), and the step which does not substantially operate. It can be said that it is a motor.

Therefore, when viewed from the second hand step motor 31, the other plurality of step motors (minute hour hand step motor 32, dual minute hour hand step motor 33, function display hand step motor 34) substantially does not operate. The function display hand step motor 34 may be excluded from the object to be disposed at a position far from the second hand step motor 31.
As a result, the radio-controlled timepiece 1 and the movement 3 of the present embodiment, when viewed from the second hand step motor 31, include only the minute hour hand step motor 32 and the dual minute hour hand step motor 33 as the other plurality of step motors. As a result, the minute hand stepping motor 32 is arranged at a position farthest from the second hand stepping motor 31.

Further, the stepping motor in the electronic timepiece and the movement of the electronic timepiece according to the present invention can be limited to only the stepping motor driven at a constant cycle.
That is, the second hand step motor 31, the minute hour hand step motor 32, and the dual minute hour hand step motor 33 in the radio wave correction timepiece 1 and movement 3 of the present embodiment operate at a constant cycle. This is an example of a step motor in the movement of an electronic timepiece.

On the other hand, the function indicating hand step motor 34 in the radio wave correction timepiece 1 and the movement 3 of the present embodiment is driven at an indefinite period corresponding to the irregular operation, and therefore in the electronic timepiece and the movement of the electronic timepiece of the invention. The step motor can be excluded.
In addition to the function indicating hand step motor 34 described above, the step motor corresponding to such irregular operations corresponds to a step motor for a chronograph indicating hand and a function operated by a user operation. A step motor or the like can be applied.

  In the radio-controlled timepiece 1 and the movement 3 of the present embodiment, an impact detection function is added to the second hand step motor 31 that drives the second hand 5c and the minute hand step motor 32 that drives the minute hand 5b and hour hand 5a. However, the electronic timepiece and the movement of the electronic timepiece of the invention are not limited to this embodiment.

  That is, the radio-controlled timepiece 1 and the movement 3 are, for example, instead of the second hand step motor 31 and the minute hour hand step motor 32, as a single step motor for driving the second hand 5c and the minute hand 5b, An hour hand step motor may be provided as a step motor for driving 5a, and an impact detection function may be added to each of the second minute step motor and the hour hand step motor. In this case, similarly to the minute hour hand step motor 32, the second minute hand step motor may have two coils.

  For example, the radio-controlled timepiece 1 and the movement 3 are replaced with, for example, the second hand step motor 31 and the minute hour hand step motor 32 as a step motor for driving the second hand 5c and a step motor for driving the minute hand 5b. As a step motor for driving the minute hand and an hour hand step motor as a step motor for driving the hour hand 5a, an impact detection function is added to each of the second hand step motor, the minute hand step motor, and the hour hand step motor. Also good.

  Since the electronic timepiece has a main function of displaying time information, the time information is displayed with a larger pointer than a pointer that displays other additional functions. The pointer for displaying the time information has a higher driving frequency than the pointer for displaying other additional functions. Therefore, the electronic timepiece and the movement of the electronic timepiece according to the present invention add an impact detection function to the step motor that drives the hour hand, the minute hand, or the second hand for displaying time information, thereby preventing or suppressing the displacement of a large pointer that is easily visible. What can be done is a very important advantage.

1 Radio-controlled watch 3 Movement 4 Dial 4a Dual minute lowercase plate 4b Function display lowercase plate 4c Function switching lowercase plate 5a Hour hand 5b Minute hand 5c Second hand 5d Dual hour hand 5e Dual minute hand 5f Function display hand 5g Function switching hand 31 Step motor for second hand 32 minute hour hand step motor 33 Dual minute hour hand step motor 34 Function display hand step motors L1, L2, L3 Distance

Claims (9)

Including at least three step motors including a step motor to which an impact detection function for controlling driving by detecting an impact input is added;
The step motor having the highest driving frequency among the step motors is a movement of an electronic timepiece disposed at a position farther from the step motor to which the impact detection function is added than the other step motors.   The movement of the electronic timepiece according to claim 1, wherein the step motor is arranged at a position farther from the step motor to which the impact detection function is added in the descending order of the drive frequency.   The movement of the electronic timepiece according to claim 1 or 2, wherein an operation member excluding other step motors is arranged between the step motor having the highest driving frequency and the step motor to which the impact detection function is added. . Equipped with an antenna to receive radio waves,
The movement of the electronic timepiece according to any one of claims 1 to 3, wherein a buzzer coil is disposed in a space around the antenna.   There are a plurality of step motors to which the impact detection function is added, and the step motor to which at least one other impact detection function is added to the step motor to which at least one impact detection function is added is different from the other step motors. The movement of the electronic timepiece according to any one of claims 1 to 4, wherein the movement of the electronic timepiece is disposed further apart.   6. The movement of an electronic timepiece according to claim 5, wherein the step motors to which the impact detection function is added are a second hand step motor for driving a second hand and a minute hour hand step motor for driving a minute hand and an hour hand.   The electronic timepiece movement according to claim 6, wherein the minute hour hand stepping motor has two coils.   The movement of the electronic timepiece according to any one of claims 5 to 7, wherein the two step motors to which the impact detection function is added are disposed at positions diagonal to each other. The movement of the electronic timepiece according to any one of claims 1 to 8,
An electronic timepiece having a pointer driven by the step motor.