JP6133647B2 - Electronic equipment with orientation measurement function - Google Patents

Description

The present invention relates to an analog electronic device with a direction measuring function, in which a step motor and a direction (geomagnetic) sensor are mounted inside the device. In particular, the present invention relates to an arrangement of an orientation sensor that suppresses the influence of a magnetic field from a rotor.

In recent years, as disclosed in Patent Document 1, an electronic azimuth meter in which a plurality of stepping motors and azimuth (geomagnetic) sensors are mounted inside a device has been put into practical use.
Since the electronic azimuth sensor detects magnetism with the azimuth sensor and calculates the azimuth based on the detection result, the electronic azimuth sensor is easily affected by factors such as the arrangement angle of the sensor itself and a magnetic substance arranged in the vicinity.

JP 2011-47841 A

According to Patent Document 1, there is a description that the rotor magnetism of the step motor affects the measurement by the azimuth sensor, and the misalignment of the azimuth and the measurement accuracy are liable to occur due to the arrangement of the staple motor. Therefore, when there is a layout change due to a design for dealing with a new product, there may be a case where the orientation measurement values are completely different.
Furthermore, when the correction process as in Patent Document 1 is performed, a memory capacity and a program for correcting these magnetic field measurement results are required, resulting in an increase in cost.

  It is an object of the present invention to realize an electronic device with an orientation measurement function equipped with a step motor and an orientation sensor that enables accurate orientation measurement without correcting the influence of rotor magnetism on the orientation measurement result. And

In order to solve the problem, an electronic device with an orientation measurement function of the present invention includes an orientation sensor that measures geomagnetism for orientation measurement, and a step motor having a rotor, and the orientation sensor is an S pole of the rotor. Are arranged at positions that do not overlap with the extended line of the straight line connecting the static stability points of the N pole and the N pole, and are arranged on a line orthogonal to the static stability point of the rotor .

  According to the present invention, only by devising the arrangement of the rotor, the influence of the magnetic field on the direction sensor by the rotor magnetism can be greatly suppressed, and there is no need to review the direction measurement value every time a new product is designed. Thus, it is possible to realize an electronic device with an orientation measurement function that can suppress mismeasurement of orientation and a decrease in measurement accuracy.

It is the simplified diagram which showed the flow of the magnetic field from a rotor at the time of arrange | positioning so that each of the N pole side of a rotor stationary with respect to an azimuth | direction sensor may face each other. It is the simplification figure which showed a mode that the magnetic effect was given to the direction sensor from the pole which opposes. It is the simple figure which showed the flow of the magnetic field from a rotor at the time of arrange | positioning an azimuth sensor to face the intermediate point of the north pole of a stationary rotor, and a south pole. FIG. 4 is a simplified diagram showing a state in which a magnetic influence is exerted on the direction sensor from the rotor in the state of FIG. 3. It is explanatory drawing about a rotor when the stator is not magnetized and is not magnetized. It is a figure explaining the arrangement | positioning relationship between a converter and a direction sensor. It is a top view of the combination timepiece which mounts one step motor and direction sensor of the 1st Embodiment of this invention. It is a top view of the multi-needle wristwatch which concerns on the 2nd Embodiment of this invention. It is the top view which showed the arrangement | positioning relationship at the time of mounting the multiple motor and direction sensor in the 2nd Embodiment of this invention. It is explanatory drawing of the direction sensor arrangement | positioning which suppressed the influence by the multiple rotor of the modification of the 2nd Embodiment of this invention. It is explanatory drawing which showed the change of distribution of the magnetic field by the unpreferable arrangement | positioning in the modification of the 2nd Embodiment of this invention. It is a plane perspective view of the modification of the 2nd Embodiment of this invention.

[1] Description of Principle First, the basic principle of the present invention will be described with reference to the drawings.

First, the case where the N pole side and the S pole side of the rotor face the azimuth sensor (in front) will be described.
FIG. 1 is a simplified diagram showing the flow of a magnetic field from a rotor when the N pole side and the S pole side of the rotor stationary with respect to the azimuth sensor are facing each other, and FIG. When the pole faces the direction sensor, FIG. 1B shows the case where the S pole faces the direction sensor.
FIG. 2 is a simplified diagram schematically showing the influence of the rotor magnetic poles in FIG. 1 on the direction sensor. FIGS. 2A and 2B correspond to FIGS. 1A and 1B, respectively. .

  In FIG. 1, reference numeral 1 denotes a geomagnetic sensor for measuring geomagnetism in order to measure an azimuth, and is referred to as an “azimuth sensor” in this specification. In FIG. 1, the azimuth sensor 1 is described as a rectangle, but is not limited thereto. In addition, the azimuth sensor 1 uses a two-axis type that detects front-rear and left-right geomagnetism, a three-axis type that detects top-bottom and left-right geomagnetism in addition to the front-rear and left-right directions, and uses a Hall element for detection methods There are various types such as those to be performed, but the type is not particularly limited.

  Reference numeral 2 denotes a rotor of a step motor (not shown), which has N and S poles. Reference numeral 3 denotes a magnetic field flow (line of magnetic force) that exits from the N pole of the rotor 2 and moves toward the S pole. The magnetic field lines 3 are divided into 3a on the left side and 3b on the right side with respect to the line L orthogonal to the boundary between the N pole and the S pole.

Next, the principle will be described. 1 (a) and 1 (b), only the difference between the poles of the opposing rotor 2 being N poles or S poles will be described, so only FIG. 1 (a) will be described.
Since the azimuth sensor detects weak magnetism and determines the azimuth, it measures not only the geomagnetism but also the magnetic field of the rotor of the step motor arranged in the watch case.
As can be understood from FIGS. 1 and 2, around the rotor 2, a plurality of magnetic fluxes 3 a and 3 b separated into right and left are generated. Since the azimuth sensor 1 is a sensor that detects magnetism, not only the geomagnetism that is originally desired to be measured but also the magnetic field of the rotor 2 that is noise relative to the geomagnetism that is desired to be measured. In the arrangement shown in FIGS. 1 and 2, since a plurality of magnetic fluxes such as magnetic fluxes 3 a and 3 b are applied to the direction sensor 1, it is difficult to accurately measure only the geomagnetism with the direction sensor 1.

That is, when the north pole of the rotor 2 faces the azimuth sensor 1 as shown in FIG.
A plurality of magnetic field lines b flow into the direction sensor 1. Since the geomagnetism is weak, the magnetism by the rotor 2 tends to influence the measurement result.
Therefore, depending on the degree of magnetic influence by the rotor 2, there is a possibility that correction is required to eliminate the magnetic influence by the rotor 2 after detecting the magnetism with and without the rotor 2. There is a possibility that the manufacturing process increases and the cost increases.

  Subsequently, in order to explain the present invention, a case where the boundary between the north pole and the south pole of the rotor faces the direction sensor will be described.

  FIG. 3 is a simplified diagram showing the flow of the magnetic field from the rotor when the boundary between the N pole side and the S pole side of the rotor stationary with respect to the azimuth sensor is at a position facing directly. FIG. 4 is a simplified diagram schematically showing the influence of the rotor magnetic poles in FIG. 3 on the direction sensor. In FIGS. 3 and 4, the boundary between the N pole side and the S pole side of the stationary rotor comes to the front of the azimuth sensor, but the difference is that the direction of the magnetic lines of force changes even if the left and right polarities are switched. Therefore, only the case where the S pole is on the left and the N pole is on the right is described.

The rotor 2 has an N pole and an S pole, and the magnetic field lines 3 are divided into an upper side 3a and a lower side 3b with respect to a line L perpendicular to the boundary between the N pole and the S pole.
If it arrange | positions so that the boundary between two poles of the rotor 2 may face the azimuth | direction sensor 1 like FIG. 3, a magnetic field line may flow with respect to the azimuth | direction sensor 1 from 3a, but does not flow from 3b. Compared with FIG. 1A, the influence of the magnetic force lines generated from the rotor 2 on the azimuth sensor 1 can be reduced to half (only 3a), and the influence on the measurement result is also reduced.

  Therefore, as compared with the case where the N pole and the S pole shown in FIGS. 1 and 2 are opposed to each other, if the boundary between the two poles of the rotor 2 faces the azimuth sensor 1, the magnetic influence of the rotor 2 is affected. Thus, the possibility of requiring correction to eliminate the influence of magnetism by the rotor 2 can be reduced.

  From the above, it is better to avoid the arrangement in which the azimuth sensor 1 faces the north and south poles of the rotor 2 as much as possible, and to arrange the azimuth sensor 1 on the boundary between the north and south poles of the rotor 2. It is understood that it is preferable.

[2] Description of Step Motor Next, the actual positional relationship between the step motor and the direction sensor will be described based on the principle described with reference to FIGS. First, the step motor will be described.
FIG. 5 is a principle diagram showing the relationship between the stator 4 and the rotor 2 constituting the step motor. The stator 4 is in a non-conductive state, and the rotor 2 is shown stationary. In order to determine the rotation direction of the rotor 2, the stator 4 is provided with a step or a notch called “notch”.

In this description and the following embodiments, the description will be given by the “notch method” in which the notch 6 is provided.
As shown in FIG. 6, the step motor 10 includes a coil 8, a stator 4, and a rotor 2. The stator 4 is made of a magnetic material such as permalloy, and the rotor 2 is made of a disk-like permanent magnet, and is polarized in two poles, the N pole and the S pole. The step motor 10 functions to efficiently convert a drive signal (electric energy) supplied from an electric circuit (not shown) into mechanical energy and drive the pointer.

The stator 4 made of a magnetic material such as permalloy serves to guide the magnetic flux generated in the coil 8 to the rotor.
Further, since the stator 4 generates an N pole and an S pole when the rotor 2 is driven, it has a two-body configuration of 4a and 4b with the rotor 2 interposed therebetween. Reference numeral 7 denotes a stator coupling portion 7, which uses a non-magnetic nickel chromium (NiCr) alloy or the like in a magnetically separated state so that the divided stators 4a and 4b can be easily handled. Combined.

Generally, as the relationship between a metal conductor and a magnet, the closer the two are, the closer they are drawn. In addition, the wider the conductor surface, the easier it is to attract the magnet.
Since the stator 4 is an unmagnetized metal magnetic member, the notch 6 is lowered by one step from the other outer peripheral surface, so that the rotor 2 is stationary and stable at a wide position on the adjacent conductor surface. The stable position is generally referred to as “static stable point”, and the static stable point of the S pole and N pole of the rotor is connected by a straight line is M1 indicated by a dotted line in FIG. A plurality of magnetic field lines converge on the extension line. The arrangement of the rotor and the azimuth sensor in FIGS. 1 and 2 is the same as the arrangement of the azimuth sensor in the vicinity of the extension line of M1.

[3] Explanation for Arrangement of Actual Step Motor and Direction Sensor FIG. 6 is a principle diagram for explaining the arrangement relationship between the converter and the direction sensor 1 in consideration of a static stable point.

As described above, the step motor 5 includes the rotor 2, the stator 4, and the coil 8.
Reference numeral 2a denotes a rotor kana that is a gear for transmitting the rotation of the rotor 2 to a train wheel (not shown) that drives a display body (not shown) such as a pointer.

  M1 indicates an extension line of the static stable point of the rotor 2, and M2 is a line orthogonal to M1.

  As described above, when the azimuth sensor 1 is arranged on M1, the azimuth sensor 1 is most strongly affected by the magnetism of the rotor 2 because it faces the N pole or S pole of the rotor 2.

  On the other hand, when the orientation sensor 1 is arranged on M2 orthogonal to M1, the orientation sensor 1 is positioned on the boundary between the north pole and the south pole, and the orientation sensor 1 is most difficult to be affected by the magnetism of the rotor 2.

  Therefore, it is most preferable to arrange the azimuth sensor 1 at M2, which is on a line orthogonal to the static stable point. However, it cannot always be arranged on M2 in relation to other parts. In that case, it should not be placed at least on M1, which is an extension of the static stable point.

  Here, “disposing the orientation sensor 1 on M1 and M2” means “M1 and M2 pass through at least a part of the orientation sensor 1”. In other words, “the azimuth sensor 1 is not placed on M1 and M2” means that “M1 and M2 do not pass the azimuth sensor 1 at all”. Therefore, when arranging the azimuth sensor 1, it is necessary to arrange it so that “M1 does not pass through the azimuth sensor 1 at all”.

  The direction sensor 1 should be as far away from M1 as possible and close to M2 as much as possible. However, how much it is to be set is appropriately set according to the characteristics of the direction sensor 1 and the step motor 10.

  As one criterion, it is conceivable to avoid a region N having an extent corresponding to the radius r of the rotor 2 of M1. This is because the magnetism affecting the azimuth sensor 1 is emitted from the rotor 2, and therefore the width (diameter) of the rotor 2 is considered to be particularly strongly influenced by magnetism.

[4] Explanation with real clock
[First embodiment: When there is one step motor]
Next, an embodiment in which the positional relationship between the orientation sensor and the rotor in FIG. 6 is applied to an actual timepiece will be described.
FIG. 7 is a plan perspective view of a CQ (combination quartz) timepiece equipped with one motor and direction sensor 1 of the present embodiment. The CQ referred to here is a clock that can indicate the time with an hour, minute, and second hand and digitally display the date, day, time, time measurement result, and the like on an LCD or the like.
In addition, the same number is attached | subjected to the same component as the above-mentioned, and the description is abbreviate | omitted.

FIG. 7 is a simplified illustration of a medium three-hand wristwatch that digitally displays orientation measurement results.
For the sake of simplicity, based on the movement 100, main members, specifically, an outer case 29, a crown 12 (winding stem 11), a push button 30, a pointer (hour hand 13, minute hand 14, second hand 15), Step motor 5 (coil 8, stator 4, rotor 2), digital display member 9, battery 10, azimuth sensor 1, reverse mechanism (settle 16, yoke 17, back presser 18, pinion wheel 19, small iron wheel 20), etc. Only the main parts are shown, and the other parts are not shown.

Reference numeral 29 denotes an exterior case that holds the movement 100. The exterior case 29 includes a crown 12 and a push button 30 as operation members. Reference numeral 11 denotes a winding stem attached to the crown 12, and transmits the operation of the crown 12 to the movement 100 through the above-described reverse mechanism. The time display method in the present embodiment is a general three-hand display format. The hour hand 13, the minute hand 14, and the second hand 15 are driven by a step motor 5 through a wheel train (not shown) to display the time. Reference numeral 10 denotes a battery as a power source. The battery 10 may be a rechargeable secondary battery in addition to the primary battery.
Each part of the winding stem 11 and the backside mechanism (the setting lever 16, the yoke 17, the reverse presser 18, the pinion wheel 19, and the small iron wheel 20) are the same as those used in a general analog type timepiece. Detailed description is omitted.

  Reference numeral 9 denotes a digital display member such as an LCD. In the azimuth measurement, the measurement result detected by the azimuth sensor 1 is processed by an IC on a circuit board (not shown) to calculate the azimuth, and the digital display member 9 displays the azimuth. When the azimuth measurement is measured and displayed one by one, the power consumption increases, which causes a reduction in battery life. Therefore, instead of always operating, for example, when measurement is desired, the push button 30 is used to shift to the measurement mode and display the measurement result only for a certain period of time.

  In FIG. 7, based on the principle described in [1] to [3], the azimuth sensor 1 is arranged on a line M2 orthogonal to the extension line M1 of the static stable point of the rotor 2. By arranging in this way, the influence of the magnetic flux lines of the rotor 2 on the direction sensor 1 can be minimized.

  Regarding the arrangement of the azimuth sensor 1, it is necessary to pay attention to the arrangement of the battery 10, the reverse mechanism, and the winding stem 11 in addition to the positional relationship of the step motor 5. Many of the parts are metal magnetic members such as SK materials (carbon tool steel materials) and SUS materials (stainless steel materials). When these magnetic members are arranged around the azimuth sensor 1 and the step motor 5, these magnetic members are magnetized under the influence of the rotor 2. Therefore, the azimuth sensor 1 is affected in the same manner as the rotor 2 and may lead to erroneous measurement and a decrease in measurement accuracy.

In order to avoid the above problem, the following measures are necessary.
(1) The components around the azimuth sensor 1 and the rotor 2 are made of nonmagnetic members such as BS (brass) and plastic materials.
(2) When the magnetic material must be used due to strength, etc., the parts are arranged in a place as far away from the direction sensor 1 and the step motor 5 as possible.
(3) A magnetic material that releases magnetism is separately disposed between the magnetic member and the orientation sensor 1.

In consideration of the above, in this embodiment, component placement is performed as follows.
(A) In order to keep away from the reverse mechanism that is a magnetic material, the step motor 5 is arranged at 9 o'clock,
(B) In order to suppress the influence of the rotor 2, the orientation sensor 1 is disposed on the M2 line,
(C) Furthermore, the battery 50 was placed at the 5-6 o'clock position in order to keep it away from the direction sensor 1 and the step motor 5.

  Thereby, the azimuth sensor 1 can suppress the influence from the rotor 2 and at the same time suppress the influence of the reverse mechanism and the battery 50 which are magnetic materials.

  Although not shown in FIG. 7, electronic components such as capacitors and ICs on the circuit board may also affect the direction sensor 1, so care should be taken not to place them around the direction sensor 1. It is. In particular, in the case of a double-sided board, care must be taken not to place electronic components behind the orientation sensor 1.

  By applying this embodiment, the azimuth sensor 1 can realize azimuth measurement in a state in which the magnetic influence generated from the rotor 2 and the magnetic member is minimized without correcting the rotator magnetism in the azimuth measurement result. .

[Second Embodiment: Case of Multiple Motors]
Next, a case where the present invention is applied to a timepiece having a plurality of step motors will be described. Also in the present embodiment, the same constituent elements as those described above are denoted by the same reference numerals, and detailed description thereof is omitted.

First, schematic specifications of the timepiece according to the present embodiment will be described with reference to the drawings.
FIG. 8 is a plan view showing a display form of a multi-needle wristwatch according to the second embodiment of the present invention.

  The timepiece of this embodiment is an analog multi-function timepiece having an altitude measurement function in addition to the direction measurement function.

Reference numeral 34 denotes a dial plate, which is omitted or simplified in FIG. 8, but describes indices related to orientation measurement and altitude measurement.
As in the first embodiment, the time is displayed by three hands: an hour hand 13, a minute hand 14, and a second hand 15. Further, in this embodiment, the hour hand 13, the minute hand 14, and the second hand 15 are driven by a single step motor via a train wheel in conjunction with a date display (date plate) visible from the date window shown in 21. ing.

  Reference numeral 22 is a pointer for displaying both the battery charge amount (remaining capacity) and the direction. When the direction measurement is performed, the direction is indicated, and in other cases, the battery charge amount (remaining capacity) is displayed. Below, the battery charge amount (remaining capacity) is indicated by the “charge amount hand”, the azimuth indication is indicated by the “azimuth hand”, and both function indications are indicated by the “direction (charge amount) needle”. Call it. The direction (charge amount) needle 22 is driven by a dedicated motor.

  23 is a main altitude hand, 24 is a sub altitude hand, and the main altitude hand 23 displays an altitude of 10 m. The sub-altitude needle 24 includes a first sub-altitude needle 24a and a second sub-altitude needle 24b. The first sub-altitude needle 24a displays an altitude of 100 m, and the second sub-altitude needle 24b displays a unit of 1000 m. The main altitude hand 23 and the sub altitude hand 24 are pointers dedicated to altitude display, and are stopped at their respective reference positions except during altitude measurement. The main altitude hand 23 and the sub altitude hand 24 are each driven by a dedicated motor.

Furthermore, the analog multifunction timepiece of this embodiment includes push buttons 31 and 32 at the 10 o'clock position and the 8 o'clock position, respectively. The push button 31 at the 10 o'clock position is a push button for azimuth measurement operation, and is switched to the azimuth measurement mode by operating the push button 31 at the normal time when azimuth measurement is not performed. In the azimuth measurement mode, the azimuth sensor 1 is driven, the geomagnetism is measured, and the azimuth is calculated based on the measurement result. In the azimuth measurement mode, the charge amount hand 22 is switched to the azimuth hand to indicate the azimuth as a measurement result.

In the direction measurement mode, measurement is performed every second and the direction is displayed for 30 seconds continuously.
When 30 seconds elapse after the push button 31 is operated, the direction measurement is automatically stopped, and the direction hand 22 returns to the charge amount display and returns to the normal state.
The reason why the azimuth measurement is automatically stopped and automatically returned to the normal state in 30 seconds is to suppress battery consumption.

  The push button 31 at the 8 o'clock position is a push button for altitude measurement operation, and is switched to the altitude measurement mode by operating the push button 31 at the normal time when altitude measurement is not performed. In the altitude measurement mode, a pressure sensor (not shown) is driven to measure atmospheric pressure, and the altitude is calculated based on the measurement result. In the altitude measurement mode, the measurement result is displayed by the main altitude hand 23 and the sub altitude hand 24. The altitude measurement mode, like the azimuth measurement mode, measures and displays the measurement every 2 seconds for 5 minutes continuously, and then automatically stops the measurement and returns to the normal state.

Next, the relationship between the watch structure and the hands will be described.
FIG. 9 is a plan perspective view of a wristwatch equipped with four motors and a direction sensor 1 in a movement state.
This figure shows the structure forming the multi-needle display of FIG. Based on the movement 100, the main members, specifically, winding stem 11, A motor 25, B motor 26, C motor 27, D motor 28, battery 50, direction sensor 1, back-turning mechanism (set lever 16 and crown 17) The arrangement of the back presser 18, the pinion wheel 19, the small iron wheel 20, and the quick correction transmission wheel 27) is shown.

The direction sensor 1, the battery 50, the winding stem 11, and the reverse mechanism (the setting lever 16, the yoke 17, the reverse presser 18, the clutch wheel 19, the small iron wheel 20, and the quick correction transmission wheel 27) are the same as in the first embodiment. . However, in the present embodiment, since the back mechanism is close to the direction sensor 1, the back mechanism is made of a nonmagnetic material. In the present embodiment, four step motors 25-28 are provided, details of which will be described later.
A train wheel is arranged in a region surrounded by the step motors 25-28. The train wheel transmits the power of each step motor to drive the above-mentioned pointer, but its shape and driving operation are not related to the present invention, and thus detailed description thereof is omitted. The train wheel is also made of a nonmagnetic material. Except for the above parts, illustration is omitted.

As described above, in the present embodiment, a total of four step motors are mounted, and each drive the following pointers.
(I) A motor 25: time display (hour hand 13, minute hand 14, second hand 15) / date display (ii) B motor 26: altitude display (main altitude hand) 23
(Iii) C motor 27: altitude display (sub-altitude hand) 24
(Iv) D motor 28: charge amount display / direction indicator hand 22

The A motor 25 is used for the time display, and the hour hand 13, the minute hand 14, the second hand 15 and the date display are driven by one step motor. In the present embodiment, as with a general analog timepiece, time correction and date correction are performed through the back mechanism by the crown operation. Since the time display by the hand is always performed except for the time correction, the A motor 25 is always driven every second.
For the altitude display, two step motors B motor 26 and C motor 27 are used to drive the main altitude hand 23 and the sub altitude hand 24, respectively.

  As described above, the altitude display is performed only in the altitude measurement mode for a predetermined time (5 minutes) from the operation of the push button 31. Therefore, the B motor 26 and the C motor 27 are substantially stopped.

  The D motor 28 drives an azimuth (charge amount) needle 22 that serves both as a charge amount display and an azimuth display. As described above, the azimuth display is performed only in the azimuth measurement mode for a predetermined time (30 seconds) from the operation of the push button 32. Therefore, it is used as a charge amount display motor for most of the time. However, the power consumption in the normal state is small, and therefore, the frequency of changing the display of the charge amount (remaining capacity) is extremely low. Accordingly, it can be said that the D motor 28 is also a motor that is substantially stopped, like the B motor 26 and the C motor 27.

Now, in order to reduce the influence of the magnetism of each step motor 25-28 on the azimuth sensor 1, in this embodiment, the components are arranged with the following in mind.
(1) It is best to apply the present invention to all stepping motors and arrange them on a line M2 orthogonal to the static stable point of the rotor of all stepping motors.
(2) If the complete implementation of (1) is not possible due to restrictions on component placement, it is placed on M2 of the step motor with a long stop time.
(3) In (2), when there is a step motor that cannot be arranged on M2 among the step motors having a long stop time, the step motor is arranged on M2 of the step motor close to the direction sensor 1.
(4) Try not to place step motors that cannot be placed on M2 on the extension of M1.
(5) Step motors having a short stop time (always driven) are excluded from the application of the present invention, but are kept away from the azimuth sensor 1 as much as possible.

Considering the above,
(1) A step motor that continues to stop substantially, and is a line M2-1 perpendicular to the static stable point of the rotor with respect to the B motor 26 and the D motor 28 that are relatively close to the direction sensor 1. The orientation sensor 1 is arranged on M2-2.
(2) Although the C motor 27 is a step motor that continues to stop substantially, it is disposed at a position farthest from the direction sensor 1 and is not applicable to the present embodiment.
(3) Although the application of the present invention is not applied to the A motor 25, the A motor 25 is disposed away from the azimuth sensor 1 and further sandwiched by a back-around mechanism that is a nonmagnetic member.
(4) The A motor 25 and the C motor 27 are also not arranged on the extension of M1 of the direction sensor 1.

  By executing the arrangement as described above, even in a multi-function timepiece having a plurality of step motors, the present invention can be applied without any design restrictions in the arrangement of parts as much as possible, and the influence of the step motor on the direction sensor can be reduced. By reducing the number, it is possible to achieve a multi-function electronic timepiece with a highly accurate bearing measurement function.

  In the present embodiment, a step motor having a long stop time is selected as the step motor for disposing the azimuth sensor 1 on M2. However, a motor having a strong magnetic force of the rotor 2 (such as a large rotor and a strong magnet's magnetic force) is used. You may choose.

[Modification of Second Embodiment]
Subsequently, a modified example (hereinafter, a modified example) of the second embodiment will be described with reference to the drawings. In addition, about the above-mentioned component, the same number is attached | subjected and detailed description is abbreviate | omitted.
First, the principle of this modification will be described.

  FIG. 10 is a simplified diagram of a modified arrangement that can suppress the influence of a plurality of rotors of an orientation sensor by applying this modification. An orientation sensor 1 is placed in the center, and a plurality of rotors 2 are arranged around the orientation sensor 1. Reference numeral 33 denotes the distribution of the magnetic field formed by the magnetic field lines coming out of the rotor.

In FIG. 10, four rotors of the same type are used as an example. Here, the same type indicates a rotor in which the material, shape, and characteristics of the target part are the same. As an arrangement method, four rotors 2 are arranged so as to face four sides of the orientation sensor 1. In other words, when the rotor 2 is in a stationary state, the azimuth sensor 1 is arranged so as to be positioned on an extension line of M2 that is a boundary between the N pole side and the S pole side of all the rotors. Directly facing the boundary between the N pole side and the S pole side is the same as arranging on the line M2 orthogonal to M1.
Thereby, it becomes possible to obtain the same effect as the above-described embodiments.

In 33, the magnetic field lines are distributed from the north pole to the south pole due to the mutual relation between the magnetic poles. In addition, when the rotor is disposed at a close position, in addition to the flow of magnetic lines of force generated by a single rotor, the magnetic field between adjacent rotors must be considered.
Therefore, in FIG. 10, the different polarities of the rotors are arranged adjacent to each other. With the above arrangement, the ratio of the magnetic field formed between the different poles of the rotors 2 arranged side by side can be increased, and the direct magnetic field lines leaking from the rotor 2 to the direction sensor 1 can be reduced. High azimuth measurement is possible.

  Using the characteristics of the magnetic field flowing from the N pole to the S pole, as shown in FIG. 10, it is possible to control the flow so that the magnetic fields generated by the four rotors circulate around the orientation sensor 1. The sensor 1 is arranged so as to avoid the distribution position of the magnetic field, and in addition to being directly opposed to the boundary between the N pole side and the S pole side, it is possible to perform measurement while further suppressing the influence of the magnetism of the rotor 2.

When a wristwatch is configured with the above-described rotor arrangement, ignoring the materials and mechanisms of other parts constituting the watch, the larger the number of rotors 2, the closer the rotors 2 are drawn to each other, and the direct orientation sensor. Magnetic field lines passing through 1 can be reduced. Therefore, there are advantages in the following points as compared with the second embodiment.
(1) In the case of the arrangement of this modification, instead of applying the method of arranging the azimuth sensor on the extension line of M2 by narrowing down to the frequently used rotor as in the second embodiment, all the rotors to be used are used. Since the azimuth sensor can be arranged on the extended line of M2, the magnetic flux of the rotor that adversely affects the azimuth sensor can be minimized.
(2) Since the arrangement is such that the magnetic flux generated by the rotor is actively controlled so as not to leak in the direction of the azimuth sensor, the magnetic flux of the rotor that adversely affects the azimuth sensor can be minimized.
From the above, the measurement accuracy is further improved in the present modification.
However, in performing this modification, as shown in FIG.
(I) When the number of rotors is small and the arrangement distance between the rotors is not uniform (FIG. 11 (a))
(Ii) When the distance between the rotor and the orientation sensor is too close (FIG. 11 (b))
It is necessary to pay attention to these two points.
If any of the above apply,
In (iii), the distribution of the magnetic field is disturbed, and the leaked magnetic force may reach the direction sensor 1,
In (iv), there is a concern that magnetic force may be exchanged between the rotors facing each other with the direction sensor 1 interposed therebetween, and the possibility of passing through the direction sensor 1 and receiving it. Therefore, it is desirable that the rotor 2 be arranged so as to avoid the above (i) and (ii).
The arrangement of FIG. 10 is a preferable form that can avoid (i) and (ii).

Next, an embodiment in which the positional relationship between the azimuth sensor and the rotor in FIG. 10 is used in an actual timepiece will be described.
FIG. 12 is a plan perspective view of a wristwatch incorporating a movement equipped with four motors having a rotor and a direction sensor 1 according to this embodiment, and the components are exactly the same as those of the second embodiment.

  The timepiece of FIG. 12 is an analog multi-function timepiece having an orientation measurement function and an altitude measurement function similar to those of the second embodiment, and is a model in which the arrangement position of the rotor is changed. As the rotor arrangement is changed, the push button 31 mounted in the second embodiment is moved from 10 o'clock to 2 o'clock, and the push button 32 is moved from 8 o'clock to 4 o'clock. Is changed from 4 o'clock to 3 o'clock.

The reason for changing the position of the pushbutton crown is that the motor is moved to the position where the present embodiment is established, so that a sufficient space for arranging the train wheel is secured and the magnetic member is used. There are two points of moving the push button crown, which is a large component, away from the four motors and the direction sensor 1.
Since the other specifications are the same as those of the second embodiment, detailed description thereof is omitted.

  Similar to the second embodiment, the azimuth sensor 1 and the four motors are provided, and the arrangement of this modification, specifically the azimuth sensor, is measured from each of the four sides of the azimuth sensor 1 mounted on a circuit block (not shown). The direction sensor 1 is arranged on the line M2 perpendicular to M1 in a state where the boundaries of the north and south poles of the rotor of each motor are directly opposed to the four sides of 1, and the leakage of magnetic force to the direction sensor 1 is prevented. Each motor 25-28 is arranged at a position to ensure a possible distance.

  In the second embodiment, the influence of the magnetic field from the rotor located far from the azimuth sensor is considered to be small, and the present invention is applied only to the rotor close to the azimuth sensor. However, it cannot be said that there is no direct magnetic force from a non-target rotor. In that respect, in this modification, since the present invention is applied to all rotors, the magnetic force transmitted from the rotor to the sensor is suppressed, and the direction of the magnetic force lines between adjacent rotors is not directly applied to the sensor. By controlling, a result with higher measurement accuracy can be obtained.

However, when the sensor arrangement as shown in FIG. 12 is adopted, it is required that the rotors around the sensor be as equally spaced as possible, and the distance from each rotor to the sensor be uniformly arranged.
In order to establish the effect of this modification, it is a condition that the flow of magnetic lines of force between adjacent rotors is controlled. This is because the possibility of being involved in sensor measurement is high. By making the component position paying attention to the distance and distance of the rotor with respect to the azimuth sensor, it is possible to suppress the deviation in measurement accuracy.

DESCRIPTION OF SYMBOLS 1 Direction sensor 2 Rotor 3 Magnetic field flow 4 Stator 5 Step motor 6 Notch 7 Stator coupling part 8 Coil motor 9 Digital display member 10 Battery 11 Winding stem 12 Crown 13 Hour hand 14 Minute hand 16 Hand 17 17 Adjusting lever 18 Back presser 19 Handwheel 20 Small iron wheel 21 Date display 22 Direction / charge amount hand 23 Main altitude hand 24 Sub altitude hand 25 A motor 26 B motor 27 C motor 28 D motor 29 Exterior case 30 Push button 31 Push button (for direction measurement)
32 Push button (for altitude measurement)
33 Magnetic field distribution in multiple rotors 34 Dial 35 Magnetic field line distribution 100 Movement M1 Extension line of static stable point of rotor 2 M2 Line orthogonal to M1

Claims (6)

An orientation sensor that measures geomagnetism for orientation measurement,
A step motor having a rotor,
The azimuth sensor is disposed at a position that does not overlap with an extended line of a straight line that connects the static stable points of the S pole and N pole of the rotor, and is disposed on a line orthogonal to the static stable point of the rotor. An electronic device with a azimuth measurement function. A plurality of step motors;
The direction sensor is
Among the multi-step motors, at least one step motor is arranged on a line orthogonal to the static stable point of the rotor.
The electronic apparatus with an orientation measurement function according to claim 1 . As a step motor in which the azimuth sensor is arranged on a line perpendicular to the static stable point of the rotor,
The electronic device with an orientation measuring function according to claim 2 , comprising at least a step motor disposed closest to the orientation sensor. As a step motor in which the azimuth sensor is arranged on a line perpendicular to the static stable point of the rotor,
At least include the step motor with the longest stop time
The electronic apparatus with an orientation measuring function according to claim 2 or 3 . As a step motor in which the azimuth sensor is arranged on a line perpendicular to the static stable point of the rotor,
At least a step motor having the strongest magnetic force of the rotor is included.
The electronic device with an orientation measuring function according to any one of claims 2 to 4 . All step motor rotors are arranged at equal intervals so as to surround the orientation sensor, and
The orientation sensor is arranged on a line perpendicular to the static stable point of the rotor
The electronic apparatus with an orientation measurement function according to claim 1 .

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