JP6547049B2 - Satellite radio watch - Google Patents

Description

  The present invention relates to a satellite radio watch.

  A radio-controlled watch (hereinafter referred to as a satellite radio-controlled watch) that receives radio waves from satellites (hereinafter referred to as satellite radio waves) used for positioning systems such as GPS (Global Positioning System) satellites and corrects time is proposed. ing. This is because the positioning signal represented by the GPS signal includes accurate time information.

  Since satellite radio waves need to straddle the ionosphere, they use ultra-high frequency waves, and are suitable for receiving ultra-high frequency waves for reception, and flat antennas such as patch antennas that are small and thin enough to fit in a watch may be used. The

  The following Patent Document 1 describes a satellite radio wristwatch in which a flat antenna is housed in a metal case.

JP, 2011-208944, A

  The satellite radio watch described in Patent Document 1 described above receives satellite radio waves by circular polarization using a planar antenna. However, since the planar antenna is disposed in a biased manner in the metal cylinder, it is difficult to sufficiently improve the reception sensitivity of the planar antenna due to the influence of the metal portion close to the planar antenna.

  The present invention has been made in view of such circumstances, and an object thereof is to enhance the reception sensitivity of a flat antenna.

  In order to solve the above problems, the invention disclosed in the present application has various aspects, and the outline of typical ones of the aspects are as follows.

  (1) A rectangular planar antenna for receiving satellite radio waves including time information, and a cylinder surrounding the planar antenna in plan view, and the feeding portion of the planar antenna is with respect to the center of the planar antenna Provided on the side of the side having the shortest average distance from each side of the planar antenna to the cylinder, or on the side of the opposite side of the side having the shortest average distance, and at least a motor or quartz crystal relative to the center of the planar antenna One of a vibrator and a magnetic plate passes through the center of the flat antenna, and is provided on the opposite side of the side of the shortest average distance than a straight line parallel to the side of the shortest average distance.

  (2) In (1), the satellite radio wristwatch in which at least one pointer axis, the center of the planar antenna, and the feeding portion are disposed on a straight line in plan view.

  (3) The satellite radio wristwatch according to (1) or (2), wherein a difference in average distances to the trunk in two sides orthogonal to the side with the shortest average distance is 10% or less.

  (4) In any one of (1) to (3), the feed unit is a strip electrode provided on or connected to a side surface of the planar antenna.

  (5) The satellite radio wristwatch according to any one of (1) to (4), in which at least the center of the planar antenna, the feeding portion, and the battery are arranged in a straight line in plan view.

  (6) A rectangular planar antenna for receiving satellite radio waves including time information is provided, and a feeding portion of the planar antenna is at least a motor, a quartz oscillator, from each side of the planar antenna with respect to the center of the planar antenna. A satellite radio wristwatch provided on the side of the side with the shortest distance to any one of the magnetic plates or the side of the opposite side of the side with the shortest distance.

  According to the side surface of (1) of the present invention, a satellite radio-controlled wristwatch can be obtained in which the reception sensitivity of the planar antenna is enhanced even when a motor, a quartz oscillator and a magnetic plate are provided.

  Further, according to the above-mentioned aspect (2) of the present invention, there can be obtained a satellite radio wristwatch in which the reception sensitivity by the flat antenna is further enhanced.

  Moreover, according to the side surface of (3) of the present invention, a satellite radio wristwatch can be obtained in which the reception sensitivity by the flat antenna is further enhanced.

  Moreover, according to the side surface of (4) of the present invention, a satellite radio-controlled wristwatch can be obtained in which the reception sensitivity of the planar antenna is further enhanced even when the capacitive coupling type planar antenna is provided.

  Moreover, according to the side surface of (5) of the present invention, even when the battery is provided close to the flat antenna, the satellite radio-controlled wristwatch can be obtained in which the reception sensitivity of the flat antenna is enhanced.

  Further, according to the side surface of (6) of the present invention, the satellite radio-controlled wristwatch in which the reception sensitivity of the flat antenna is enhanced even when the motor, the quartz oscillator and the magnetic plate are provided close to the flat antenna. Is obtained.

It is a figure showing a satellite radio watch according to an embodiment of the present invention. It is a figure which shows arrangement | positioning of a patch antenna. It is a perspective view which shows the structure of a surface mount type patch antenna. It is a figure which shows the distance relationship of a patch antenna and a trunk | drum. It is a figure which shows the positional relationship of a patch antenna, a motor, a crystal oscillator, and a magnetic-resistant board.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a view showing a satellite radio watch 1 according to an embodiment of the present invention. The satellite radio-controlled watch 1 includes a body 10, a dial 12, a crown 14, a first push button 16, a second push button 18, an hour hand 20, a minute hand 22, a second hand 24, and a patch antenna 30. Here, the patch antenna 30 which is a flat antenna is provided on the back surface (surface opposite to the viewing side) side of the dial 12.

  The barrel 10 is made of metal. Since radio waves of ultra high frequency waves such as satellite radio waves received by the satellite radio wave watch 1 are reflected and absorbed by the conductor, if the patch antenna 30 is simply biased in the trunk 10, it will conduct in the vicinity of the receiving surface side The body will be present, and the reception sensitivity will be reduced. Therefore, the satellite radio-controlled wristwatch 1 according to the present embodiment has various structures described below in order to minimize the decrease in the reception sensitivity while disposing the patch antenna 30 simply in the trunk 10 ing.

  The dial 12, the hour hand 20, the minute hand 22 and the second hand 24 enclosed by the barrel 10 are covered with a windshield not shown. The windshield is formed of an insulating material such as glass and has little influence on the reception sensitivity of the patch antenna 30. Similarly, the dial 12 is also formed of an insulating material, for example, various synthetic resins, ceramics, or biominerals such as shellfish, and does not affect the reception sensitivity of the patch antenna 30. Similarly, it is desirable to form the hour hand 20, the minute hand 22 and the second hand 24 with an insulating material in terms of reception sensitivity, but when these are formed of a conductive material such as metal, the reception sensitivity of the patch antenna 30 is Its size and height are determined so as not to have a significant effect. That is, it is considered to make the size small so as not to significantly affect the reception sensitivity of the patch antenna 30, or to arrange the patch antenna 30 at a position sufficiently away from the reception surface of the patch antenna 30.

  The satellite radio-controlled wristwatch 1 according to the present embodiment is an analog clock, and a time letter indicating 3 o'clock, 6 o'clock, 9 o'clock and 12 o'clock is drawn on the dial 12, and the hour hand 20, the minute hand 22 and the second hand 24 rotate. Hour, minute, and second are displayed depending on the position. The user of the satellite radio controlled watch 1 can perform various operations including time setting by rotating the crown 14 and pressing the first push button 16 and the second push button 18. In addition, the satellite radio-controlled wristwatch 1 can perform time setting based on information on date and time included in satellite signals transmitted from GPS satellites and the like.

  The satellite radio-controlled watch 1 according to the present embodiment has a rotation shaft of the hour hand 20, the minute hand 22 and the second hand 24 at the center of the dial 12. Therefore, the patch antenna 30 can not be disposed at the center of the trunk 10, but is disposed in the trunk 10 in a biased manner, whereby a conductor is present in the vicinity of the patch antenna 30.

  Although the satellite radio wave watch 1 according to the present embodiment has the hour hand 20, the minute hand 22 and the second hand 24 as hands, auxiliary pointers for performing various displays, for example, a 24-hour display or a power reserve are provided. May be

  The design of the satellite radio watch 1 shown in FIG. 1 is merely an example. Besides the one shown here, for example, the external shape of the satellite radio watch 1 may be square instead of round. Further, a date window may be provided on the dial 22 to display the date and the day of the week.

  In this specification, the term satellite radio wristwatch is a wristwatch, and receives a satellite signal from a GPS satellite or the like, and holds it inside the wristwatch based on the information on the date and time contained in the satellite signal. It is used to refer to a watch that has a function to correct the internal time, which is information on the current time.

  FIG. 2 is a view of the satellite radio watch 1 viewed from the opposite side to the viewing side (the side shown in FIG. 1), and shows the arrangement of the patch antenna 30. As shown in FIG. However, in order to show the internal structure of the satellite radio watch 1, the state in which the back cover has been removed is shown. In FIG. 2, the patch antenna 30, the battery 40, the battery holder 42, the battery case 44, the lead plate 46, the pointer shaft 50, and the outer frame 52 surrounded by the body 10 are shown. Here, the patch antenna 30 shown by a dotted line is disposed at a position hidden by the lead plate 46 in a plan view. The pointer shaft 50 indicated by a dotted line is disposed at a position hidden by the battery holder 42 and the battery 40. In addition, as the pointer shaft 50, the external shape of the so-called barrel portion of a so-called hour wheel that drives the hour hand 20 is shown here. In the present embodiment, the drive shafts of the minute hand 22 and the second hand 24 are provided coaxially so as to penetrate the inside of the hour wheel.

  The patch antenna 30 in this embodiment is a so-called surface mount type patch antenna, and as shown in FIG. 3, rectangular radiation is emitted on the upper surface of a flat rectangular parallelepiped body 36 formed of an appropriate dielectric such as ceramic. An electrode 38 is formed, and on the lower surface of the body 36, one feed electrode 32 and seven ground electrodes 34 are formed. The feed electrode 32 is continuously connected to the strip electrode 33 provided on the side surface of the body 36 on the side E1. The strip electrode 33 is in close proximity to the radiation electrode 38 at the center of the side E1 and capacitively coupled. Therefore, the satellite radio wave received by the radiation electrode 38 is transmitted to the strip electrode 33 through such capacitive coupling and can be taken out from the feeding electrode 32. In addition, a solid electrode is formed on the lower surface of the body 36 to cover almost the entire lower surface as a counter electrode to the radiation electrode 38, and an insulating film having a pattern to expose a part of the solid electrode is provided. The ground electrodes 34 are parts of exposed solid electrodes and are electrically connected to each other.

  Here, the sides E1 to E4 indicate the sides of the radiation electrode 38 or the sides of the body 36 at the same height as the radiation electrode 38. In this embodiment, each side of the body 36 at the same height as the radiation electrode 38 is shown. Alternatively, the feed electrode 32 may be provided directly on the side surface of the body 36, that is, the strip electrode 33 may be used as the feed electrode 32, and the feed electrode 32 and the mounting substrate may be connected by a side mounting method.

  Returning to FIG. 2, the patch antenna 30 is mounted on the antenna substrate which is a circuit board disposed on the side of the magnetic shield 46 further on the side of the magnetic shield 46 so that the radiation electrode 38 faces the side of the visual side 12. At this time, in plan view, the feeding electrode 32 of the patch antenna 30 is provided on the side E1 side with respect to the center C30 in plan view of the patch antenna 30. The side E1 is the side having the shortest average distance to the body 10 among the four sides (sides E1, E2, E3, E4) of the patch antenna 30. The average distance from the side of the patch antenna 30 to the trunk 10 will be described in detail with reference to FIG.

  When satellite radio waves of ultrahigh frequency are incident on the receiving surface of the patch antenna 30, that is, the radiation electrode 38, the current induced on the receiving surface is transmitted to the strip electrode 33 and further to the feeding electrode 32 via capacitive coupling. . At this time, circularly polarized waves are used for the ultra-high frequency waves generally used as satellite radio waves, and an antenna for receiving such ultra-high frequency waves is also considered to be suitable for receiving circularly polarized waves. For example, if the patch antenna 30 is used as in this embodiment, its reception characteristic is made suitable for circular polarization, and designed so that there is no bias in the reception sensitivity on each of the sides E1 to E4. Ru.

  However, as shown in FIG. 2, when the patch antenna 30 is disposed in a biased manner in the metal case 10, the side close to the case 10, here the side E1, is strongly affected by the metal member. Reception sensitivity is significantly reduced. The same applies to the side E2 disposed in proximity to the battery 40, and the decrease in the reception sensitivity of the patch antenna 30 designed for circular polarization is inevitable.

  Here, as a design of the patch antenna 30, the position of the feeding portion is disposed at a position deviated from the center C30 of the patch antenna 30 to the side of a specific side, and the electrode shape is selected to obtain linear polarization as a reception characteristic. When designed, the reception sensitivity decreases at the side where the power supply unit is disposed in proximity, and increases at the side orthogonal to the side. In the present embodiment, the feed electrode 32 is arranged to be biased toward the side E1, and the electrode is designed so that the reception characteristic thereof indicates a linear polarization. As a result, the reception sensitivity of the side E1 is reduced. The reception sensitivity becomes high on the sides E3 and E4. The reception sensitivity also decreases on the side E2 opposite to the side E1.

  That is, in the present embodiment, the position of the feeding portion is intentionally disposed at a position deviated from the center C30 of the patch antenna 30 toward the side E1, and the electrode is designed to obtain linear polarization characteristics. The patch antenna as a whole is achieved by lowering the reception sensitivity of the sides E1 and E2 that do not contribute to satellite radio wave reception because they receive interference by the battery 10 and the battery 40 and increasing the reception sensitivity of the sides E3 and E4 that are not susceptible to interference by metal members. The 30 receiver sensitivity is improved.

  Therefore, the patch antenna 30 according to the present embodiment is suitable for receiving linearly polarized waves. In the present embodiment, the planar shape of the patch antenna 30 is substantially square, but may be rectangular. In addition, the patch antenna 30, particularly the radiation electrode 38, is not provided with a structure for obtaining circular polarization characteristics, for example, a notch at a corner.

  As apparent from the above discussion, the feeding electrode 32 may be provided not on the side E1 but on the side E2. Even in such a case, the patch antenna 30 has high reception sensitivity to linear polarization in the sides E3 and E4, and obtains the same reception sensitivity as in the case where the feeding electrode 32 is provided on the side E1. Can. The side E2 is opposite to the side (side E1) having the shortest average distance from each side of the patch antenna 30 to the trunk 10.

  Further, in FIG. 2, in order to show the positional relationship between the pointer shaft 50, the center C30 of the patch antenna 30, and the feed electrode 32, a straight line L1 is virtually drawn. In plan view, the pointer shaft 50, the center C30 of the patch antenna 30, and the feed electrode 32 are disposed on one straight line L1. That is, the pointer shaft 50, the patch antenna 30, and the feed electrode 32 are arranged such that a straight line L1 passing through the center C30 of the patch antenna 30 intersects the pointer shaft 50 and the feed electrode 32 in plan view.

  By adopting such a configuration, the average distance from the side E3 of the patch antenna 30 to the trunk 10 and the average distance from the side E4 to the trunk 10 become approximately the same. Therefore, the influence of the body 10 on the satellite radio waves received by the patch antenna 30 on the side E3 side and the side E4 side becomes equivalent, and the symmetry of the current induced on the receiving surface of the patch antenna 30 is improved. Radio wave reception sensitivity is improved.

  In addition, the satellite radio-controlled watch 1 is provided with a battery 40 serving as a power source for various electrical components. That is, a high frequency circuit for receiving satellite radio waves, a motor for driving a control circuit pointer for controlling the entire satellite radio watch 1, and other devices obtain power from a battery 40. The battery 40 is a button-type battery here, and may be, for example, a primary battery such as a lithium battery or a secondary battery such as a lithium ion battery. When using a secondary battery as the battery 40, it is desirable that the satellite radio-controlled watch 1 be provided with an appropriate power generation device, for example, a solar battery.

  Since the battery 40 is covered at least in the exterior with metal that is a conductor, placing the battery 40 in the vicinity of the patch antenna 30 affects the reception sensitivity as in the case of the cylinder 10 described above. Therefore, in the present embodiment, the battery 40 is provided on the side E2 of the patch antenna 30 with respect to the patch antenna 30. With such an arrangement, good conductors are not arranged in the vicinity of the sides E3 and E4 of the patch antenna 30 receiving satellite radio waves in linear polarization, and the side E2 in the vicinity of the battery 40 is as described above. Because the reception sensitivity is low, the influence of the battery 40 on the reception sensitivity of the satellite radio wave as the entire patch antenna 30 is very limited.

  Here, it is preferable to further arrange the battery 40 so that the center C40 thereof intersects with the straight line L1. That is, it is preferable that a straight line passing through the center C30 of the patch antenna 30 and the center C50 of the pointer shaft 50 intersect the feed electrode 32 and pass through the center C40 of the battery 40. By adopting such a configuration, the influence of the battery 40 on satellite radio waves becomes substantially equal between the side E3 and the side E4, and the symmetry of the current induced on the receiving surface of the patch antenna 30 is maintained. Therefore, the reception sensitivity of the satellite radio wave by the patch antenna 30 is further improved.

  FIG. 4 is a view showing the distance relationship between the patch antenna 30 and the trunk 10. As shown in FIG. FIG. 4 is a view of the satellite radio watch 1 as viewed from the back cover side, as in FIG. In FIG. 4, in order to explain the distance relationship between the patch antenna 30 and the trunk 10, the X axis and the Y axis are virtually illustrated. The X-axis is an axis from left to right in the drawing, and the Y-axis is an axis from top to bottom in the drawing.

  First, an average distance d1av from the side E1 of the patch antenna 30 to the trunk 10 will be considered. Here, the distance from an arbitrary point on the side E1 to the cylinder 10 is made perpendicular to the side E1 from the point and is the length of a line segment intersecting the inner side surface of the cylinder 10, and the coordinate x on the X axis of the point It represents as d1 (x) using. In FIG. 4, the distance d1 (x) is specifically shown by taking the center of the side E1 as an example.

  The average distance d1av from the side E1 to the torso 10 is the average over the side E1 of the distance d1 (x) from the side E1 to the torso 10. That is, assuming that the coordinates of both ends of the side E1 are x1 and x2, respectively (x1 <x2), d1av = ∫x1 → x2d1 (x) dx / (x2−x1).

  Similarly, the average distance d3av from the side E3 to the torso 10 is the average over the side E3 of the distance d3 (y) from the side E3 to the torso 10, assuming that the coordinates of both ends of the side E3 are y1 and y2, respectively y1 <y2), d3av = ∫y1 → y2d3 (y) dy / (y2−y1). Again, the distance d3 (y) from any point on side E3 to the torso 10 extends vertically from that point on side E3 to the side E3 and is the length of the line segment that intersects the inner side of the torso 10 It is.

  Similarly, the average distance d4av from the side E4 to the trunk 10 is obtained by d4av = ∫y1 → y2d4 (y) dy / (y2-y1), and the distance d4 (y) is from any point on the side E4. It is a length of a line extending perpendicularly to the side E4 and intersecting the inner side surface of the cylinder 10. Similarly, the average distance d2av from the side E2 to the trunk 10 is obtained by d2av = ∫x1 → x2d2 (x) dx / (x2−x1).

  In the arrangement of the patch antenna 30 shown in the present embodiment, as is apparent, the average distance from the side E1 to the trunk 10 is the shortest among the four sides, and the average distance from the side E3 to the trunk 10 and the side E4 to the trunk 10 It is almost equal to the average distance to Further, among the four sides, the average distance from the side E2 to the trunk 10 is the longest.

  d3av and d4av need not necessarily be equal, and may be | d3av−d4av | /d3av≦0.1 or | d3av−d4av | /d4av≦0.1. That is, if the difference between the average distances to the body 10 at two sides (E3 and E4) orthogonal to the side (side E1) having the shortest average distance from each side of the patch antenna 30 to the body 10 is 10% or less Good. In such a case, the difference between the currents induced on the sides E3 and E4 is sufficiently small, and the symmetry of the currents induced on the receiving surface of the patch antenna 30 is improved. Reception sensitivity is improved.

  FIG. 5 is a view showing the positional relationship between the patch antenna 30, the first motor 60, the second motor 62, the third motor 64, the fourth motor 66, the quartz oscillator 70, and the magnetic shield plate 80. is there. FIG. 5 is a view of the satellite radio wristwatch 1 as viewed from the back cover side as in FIG. The first motor 60, the second motor 62, the third motor 64, the fourth motor 66, the quartz crystal vibrator 70, and the magnetic plate 80 are hidden by other parts and therefore can not be seen. And indicate the position. Further, in FIG. 5, in order to explain the positional relationship between the patch antenna 30 and each component, a straight line L2 is virtually drawn.

  The first motor 60, the second motor 62, the third motor 64, and the fourth motor 66 are step motors that drive the battery 40 as a power source, and include the hour hand 20, the minute hand 22, and the second hand 34. Drive various devices. Each motor includes metal parts and can be a conductor that shields satellite radio waves. The satellite radio-controlled wristwatch 1 according to the present embodiment has four motors, but the number of motors may be three or less, or five or more.

  The crystal unit 70 oscillates at a frequency serving as a reference of internal time of the satellite radio-controlled watch 1 with the battery 40 as a power supply. The oscillation frequency of the crystal oscillator 70 is, for example, 32.768 kHz, and one second is counted by reading the timing at which the 16-bit counter overflows. The quartz oscillator 70 is housed in a metal cylinder and can shield satellite radio waves.

  The magnetic shield plate 80 is made of metal, and is disposed closer to the back cover side (the front side of the drawing sheet) than the first motor 60, the second motor 62, the third motor 64, the fourth motor 66, and the crystal unit 70. Be done. The magnetic shield plate 80 reduces the influence of an external magnetic field on a motor or the like. At the same time, the magnetic shield 80 can shield satellite radio waves.

  The first motor 60, the second motor 62, the third motor 64, the fourth motor 66, the quartz oscillator 70, and the magnetic shield plate 80 are located at the center C30 of the patch antenna 30 in a plan view shown in FIG. On the other hand, it is provided closer to the side E2 than the straight line L2. Here, the straight line L2 passes through the center C30 of the patch antenna 30, and is a straight line parallel to the side (side E1) having the shortest average distance from each side of the patch antenna 30 to the trunk 10. Here, to provide each component on the side E2 side with respect to the straight line L2 means to provide each component on the side E2 side with respect to the center C30 of the patch antenna 30 so that the component and the straight line L2 do not intersect in plan view. Say.

  The patch antenna 30 receives satellite radio waves in linear polarization by currents induced along the sides E3 and E4, but the induced currents are near the centers of the sides E3 and E4, ie, the sides E3 and E4. The thing in the vicinity of the intersection point of and the straight line L2 becomes the main. Therefore, even in the vicinity of the sides E3 and E4, particularly when the conductor is disposed in the vicinity of the centers of the sides E3 and E4, the reception sensitivity of the satellite radio wave is significantly degraded.

  In the present embodiment, by adopting the above configuration, the first motor 60, the second motor 62, the third motor 64, the fourth motor 66, the crystal oscillator 70, and the like that can shield satellite radio waves. The magnetic plate 80 can be disposed so as to avoid the vicinity of the centers of the sides E3 and E4. As a result, the conductor is not disposed near the centers of the sides E3 and E4 that mainly contribute to the reception of the satellite radio waves, and the reception sensitivity of the satellite radio waves is improved.

  In the present embodiment, the external shape of the satellite radio-controlled wristwatch 1 is a round shape, but if the rectangular shape with the same size is used, the average distance from the sides E3 and E4 of the patch antenna 30 to the trunk 10 is further increased. The reception sensitivity of satellite radio waves is further improved.

  Further, although the surface mount patch antenna 30 is provided in the present embodiment, a pin feed patch antenna may be provided. In that case, the feed pin may be provided on the side of the side with the shortest average distance from each side of the patch antenna to the trunk 10 or the opposite side with respect to the center of the patch antenna in plan view .

  As an example of the effect of this embodiment, a satellite radio watch 1 according to this embodiment and a satellite radio watch in which a patch antenna as a comparative example is rotated clockwise by 90 ° at the same position as this embodiment and arranged Were actually produced, it was confirmed that the reception sensitivity of the patch antenna 30 is improved by approximately 5 dB in the satellite radio-controlled wristwatch 1 according to the present embodiment.

  In the comparative example, two sides orthogonal to the side on which the feeding electrode is provided are both close to the large conductor (body and battery). Therefore, it is considered that the satellite radio wave is shielded by the conductor and the reception sensitivity is significantly reduced.

  On the other hand, according to the satellite radio-controlled watch 1 according to the present embodiment, the average distance from the sides E3 and E4 from which the current is induced by the linear polarization to the body 10 is sufficiently large, so the satellite radio wave is greatly affected. Without, good reception sensitivity can be obtained.

  As mentioned above, although embodiment concerning this invention was described, the specific structure shown to this embodiment is shown as an example, and limiting the technical scope of this invention to this is not intended. Those skilled in the art may appropriately modify the disclosed embodiments, and the technical scope of the invention disclosed herein should be understood to include such modifications.

  1 satellite radio-controlled wristwatch, 10 trunks, 12 dials, 14 crowns, 16 first push button, 18 second push button, 20 hour hand, 22 minute hand, 24 second hand, 30 patch antenna, 32 feeding electrodes, 33 strip electrodes, 34 ground electrode 36 body 38 radiation electrode 40 battery 42 battery holder 44 battery case 46 lead plate 50 pointer shaft 52 outer frame 60 first motor 62 second motor 64 third Motor, 66 Fourth motor, 70 quartz oscillator, 80 Magnetostatic plate.

Claims (6)

A rectangular planar antenna for receiving satellite radio waves including time information;
And a cylinder surrounding the planar antenna in plan view,
The feeding portion of the planar antenna is located on the side of the side having the shortest average distance from each side of the planar antenna to the cylinder with respect to the center of the planar antenna, or on the side of the opposite side of the side having the shortest average distance Provided
At least one of the motor, the quartz oscillator, and the magnetic field resistant plate passes the center of the planar antenna with respect to the center of the planar antenna, and the average distance is shortest than a straight line parallel to the shortest side of the average distance. A satellite radio watch provided on the side opposite to the side.   The satellite radio radio watch according to claim 1, wherein at least one pointer axis, a center of the planar antenna, and the feeding portion are arranged in a straight line in a plan view.   The satellite radio-controlled wristwatch according to any one of claims 1 and 2, wherein the difference in the average distance to the trunk on two sides orthogonal to the side having the shortest average distance is 10% or less.   The satellite radio radio watch according to any one of claims 1 to 3, wherein the feeding portion is a strip electrode provided on a side surface of the flat antenna or connected.   The satellite radio wristwatch according to any one of claims 1 to 4, wherein at least a center of the planar antenna, the feeding portion, and a battery are disposed on a straight line in a plan view. A rectangular planar antenna for receiving satellite radio waves including time information;
The feeding portion of the planar antenna is the side of the side with the shortest distance from each side of the planar antenna to at least one of the motor, the quartz oscillator, and the magnetic shield plate with respect to the center of the planar antenna. A satellite radio watch provided on the side opposite to the shortest side.

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