JP6094114B2 - Electronic clock with built-in antenna - Google Patents

Description

  The present invention relates to an electronic timepiece with a built-in antenna.

  In recent years, electronic timepieces have been developed that receive radio waves from position information satellites such as GPS (Global Positioning System) satellites and perform time correction. Patent Document 1 discloses an electronic timepiece including a metal outer case, a time display unit that is housed in the outer case and can display time, and an antenna that is housed in the outer case and receives radio waves from a position information satellite. It is disclosed.

JP 2012-1108045 A

  When the outer case of the electronic watch is formed of a conductive member such as metal, electromagnetic waves including radio waves from the position information satellite are absorbed by the outer case, so that the radio waves that should be received by the antenna are blocked by the outer case. There was a problem that the reception performance of the antenna deteriorated.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to ensure good antenna reception performance in an electronic timepiece with a built-in antenna.

In order to solve the above problems, an electronic timepiece with built-in antenna according to the present invention includes a cylindrical outer case formed at least partially by a non-conductive member and one of two openings of the outer case. A cover glass that closes the opening, an annular antenna body provided along the inner periphery of the exterior case, and a conductive member, and the antenna body and a predetermined side on the opposite side of the cover glass as viewed from the antenna body An annular ground plate spaced apart from each other, a back cover that closes the other of the two openings of the outer case, and a connection portion that electrically connects the ground plate and the back cover. It is characterized by.
According to the present invention, the outer case is made of a non-conductive member, and radio waves to be received by the antenna body are not blocked by the outer case, so that it is possible to ensure good reception performance of the antenna body. In addition, according to the present invention, since the ground plate is provided at a position spaced apart from the antenna body by a predetermined distance, it is possible to ensure good reception performance of the antenna body.
Further, according to the present invention, since the ground plate and the back cover integrally function as the ground plane of the antenna body, the potential of the ground plate is stabilized as compared with the case where only the ground plate functions as the ground plane. be able to. As a result, it is possible to ensure good and stable reception performance of the antenna body.

An electronic timepiece with a built-in antenna according to the present invention includes a cylindrical exterior case at least partially formed of a non-conductive member, and a cover glass that closes one of the two openings of the exterior case. An annular antenna body provided along the inner periphery of the outer case, a ground plate formed of a conductive member on the surface of the antenna body , and the other opening of the two openings of the outer case And a connecting portion for electrically connecting the ground plate and the back cover .
According to the present invention, the outer case is made of a non-conductive member, and radio waves to be received by the antenna body are not blocked by the outer case, so that it is possible to ensure good reception performance of the antenna body. In addition, according to the present invention, since the ground plate is provided on the surface of the antenna body, it is possible to ensure good reception performance of the antenna body.
Further, according to the present invention, since the ground plate and the back cover integrally function as the ground plane of the antenna body, the potential of the ground plate is stabilized as compared with the case where only the ground plate functions as the ground plane. be able to. As a result, it is possible to ensure good and stable reception performance of the antenna body.

In addition, the electronic timepiece with a built-in antenna described above is disposed inside the exterior case and can display a time, and at least a part is disposed inside the antenna body to drive the time display. And a drive unit.
According to this aspect, since at least a part of the drive unit is disposed inside the antenna body, the electronic watch with a built-in antenna is thinner than in the case where the antenna body is disposed on the cover glass side of the drive unit. And downsizing is possible.

In the above-described electronic timepiece with a built-in antenna, the distance between the cover glass and the drive unit is preferably shorter than the distance between the cover glass and the bottom surface of the antenna body.
According to this aspect, since the antenna body can be deeply hidden in a position separated from the cover glass, the electronic watch with a built-in antenna can be made thinner as compared with the case where the antenna body is provided near the cover glass. And downsizing is possible.

Further, in the above-described electronic timepiece with built-in antenna, the antenna body includes an annular dielectric body and an antenna element formed of a conductive member and provided on the surface of the dielectric body. It is preferable to have an inclined surface that is provided on the inner periphery of the dielectric and that is further away from the cover glass toward the center of the dielectric.
According to this aspect, since the inclined surface is provided on the inner peripheral side of the antenna body, the user of the electronic timepiece with a built-in antenna is disposed inside the antenna body as compared with the case where the antenna body does not have the inclined surface. It is possible to easily visually recognize the end of the displayed time display part. That is, according to this aspect, it is possible to improve the visibility of the time display unit by the user of the electronic timepiece with a built-in antenna.

  In the electronic timepiece with a built-in antenna described above, it is preferable that the dielectric has an upper surface continuous with the inclined surface, and the antenna element is provided on the upper surface of the dielectric.

1 is an overall view of a GPS system including an antenna built-in electronic timepiece 100 (electronic timepiece 100) according to an embodiment of the present invention. 2 is a plan view of the electronic timepiece 100. FIG. 2 is a partial cross-sectional view of the electronic timepiece 100. FIG. 2 is an exploded perspective view of a part of the electronic timepiece 100. FIG. FIG. 4 is an explanatory diagram for explaining a shape of an antenna body 40 of the electronic timepiece 100 and an antenna pattern formed on the antenna body 40. 4 is an explanatory diagram for explaining a positional relationship among an antenna body 40, a power feed pin 44, and a secondary battery 27 of the electronic timepiece 100. FIG. 4 is an explanatory diagram for explaining a positional relationship among an antenna body 40, a power feed pin 44, a magnetic plate S1, and a magnetic plate S2 of the electronic timepiece 100. FIG. 4 is an explanatory diagram for explaining a positional relationship among an antenna body 40, a power feed pin 44, and a magnetically resistant plate S3 of the electronic timepiece 100. 2 is a block diagram showing a circuit configuration of the electronic timepiece 100. FIG. 10 is an explanatory diagram for explaining a ground plate 90a according to Modification 1. FIG. It is explanatory drawing for demonstrating the antenna body 40a which concerns on the modification 2. As shown in FIG. It is a perspective view of the antenna body 40b which concerns on the modification 3. FIG. It is a partial cross section figure of the antenna body 40c which concerns on the modification 4. FIG. 10 is a partial cross-sectional view of an antenna body 40d according to Modification 5. It is a top view of the antenna body 40e which concerns on the modification 6. FIG.

  Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. However, in each figure, the size and scale of each part are appropriately changed from the actual ones. Further, since the embodiments described below are preferable specific examples of the present invention, various technically preferable limitations are attached thereto. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these forms.

<A: Mechanical structure of an electronic timepiece with built-in antenna>
FIG. 1 is an overall view of a GPS system including an electronic timepiece 100 with a built-in antenna (hereinafter referred to as “electronic timepiece 100”) according to an embodiment of the present invention. The electronic timepiece 100 is a wristwatch that receives radio waves (radio signals) from at least one of a plurality of GPS satellites 20 and corrects the internal time, and is opposite to a surface that contacts an arm (hereinafter referred to as “back surface”). The time is displayed on the surface (hereinafter referred to as “surface”).

The GPS satellite 20 is a position information satellite that orbits a predetermined orbit over the earth, and transmits a navigation message superimposed on a 1.57542 GHz radio wave (L1 wave) to the ground. In the following description, the 1.57542 GHz radio wave on which the navigation message is superimposed is referred to as a “satellite signal”. The satellite signal is a right-handed circularly polarized wave.
In the present embodiment, the electronic timepiece 100 receives radio waves from the GPS satellite 20 included in the GPS system, but the GPS system is an example of a satellite positioning system. In addition to the GPS system, the present invention provides a global navigation satellite system (GNSS) such as Galileo (EU), GLONASS (Russia), Hokuto (China), a geostationary satellite such as SBAS, or a quasi-zenith satellite. Satellite positioning systems other than GPS systems can be used that include position information satellites that transmit satellite signals containing information. That is, the electronic timepiece 100 may be a wristwatch that receives radio waves (radio signals) from position information satellites including satellites other than the GPS satellites 20 and corrects the internal time.

  Currently, there are about 31 GPS satellites 20 (in FIG. 1, only four of the 31 satellites are shown). Each GPS satellite 20 superimposes a unique pattern of 1023 chips (1 ms period) called a C / A code (Coarse / Acquisition Code) on the satellite signal in order to identify which GPS satellite 20 the satellite signal is transmitted from. . The C / A code looks like a random pattern with each chip being either +1 or -1. Therefore, by correlating the satellite signal and the pattern of each C / A code, the C / A code superimposed on the satellite signal can be detected.

  The GPS satellite 20 is equipped with an atomic clock, and the satellite signal includes extremely accurate time information (hereinafter referred to as “GPS time information”) measured by the atomic clock. Further, a slight time error of the atomic clock mounted on each GPS satellite 20 is measured by a control segment on the ground, and the satellite signal includes a time correction parameter for correcting the time error. The electronic timepiece 100 receives a satellite signal transmitted from one GPS satellite 20, and corrects the internal time to an accurate time by using GPS time information and a time correction parameter included therein.

  The satellite signal includes orbit information indicating the position of the GPS satellite 20 on the orbit. The electronic timepiece 100 can perform positioning calculation using GPS time information and orbit information. The positioning calculation is performed on the assumption that the internal time of the electronic timepiece 100 includes some error. That is, in addition to the three parameters for specifying the three-dimensional position of the electronic timepiece 100, the time error is also an unknown number. Therefore, the electronic timepiece 100 generally receives satellite signals respectively transmitted from four or more GPS satellites, and performs positioning calculation using GPS time information and orbit information included therein.

FIG. 2 is a plan view of the electronic timepiece 100. As shown in FIG. 2, the electronic timepiece 100 includes an exterior case 80. The outer case 80 is formed of a cylindrical case body 81 formed of a resin such as ABS or a ceramic or other non-conductive material, and a cylindrical case cylinder 81 formed of a resin such as ABS or a ceramic or other non-conductive material. A glass edge 82 is fitted and configured. In the present embodiment, the outer case 80 is composed of two parts, but may be composed of one part.
A disk-shaped dial 11 is arranged on the inner peripheral side of the glass edge 82 via a ring-shaped dial ring 83 formed of a non-conductive material such as plastic. On the dial plate 11, hands 13 (13 a to 13 c) are arranged around the pointer shaft 12 to indicate the current time.

As shown in FIG. 2, a small clock 14 and an indicator 15 are arranged on the dial 11.
The small timepiece 14 includes hands 142 and 143 that are rotatable about a shaft 141. The hands 142 and 143 indicate the current time in a region predetermined by the user of the electronic timepiece 100. That is, the electronic timepiece 100 includes the hands 13 and the hands 142 and 143, so that the current time in two areas can be displayed simultaneously.
The indicator 15 includes a pointer 152 that can rotate around a shaft 151. The pointer 152 is a mode executed by the electronic timepiece 100 when the electronic timepiece 100 is receiving a satellite signal (that is, which one of the time information acquisition mode and the position information acquisition mode is executed). When the satellite signal is not received, the remaining capacity of the secondary battery provided in the electronic timepiece 100 is indicated. Note that the user of the electronic timepiece 100 can use one of the operation buttons described below to display either the state in which the hands 152 indicate the mode executed by the electronic timepiece 100 or the state in which the hands 152 indicate the remaining capacity of the secondary battery. It is possible to switch from the state to the other state. The secondary battery included in the electronic timepiece 100 will be described later.

A date display unit 19 for displaying the date is arranged below the dial plate 11 so that the date display unit 19 can be seen through an opening 11 a formed in the dial plate 11.
Hereinafter, the dial plate 11, the pointer shaft 12, the pointer 13, the small clock 14, the indicator 15, and the date display unit 19 may be collectively referred to as a time display unit.
Moreover, although mentioned later for details, the exterior case 80 has the cylindrical shape which has two opening of the surface side and a back surface side. The opening on the surface side of the exterior case 80 is closed with a cover glass 84 via a glass edge 82, and the dial 11, the hands 13 (13 a to 13 c), and the small clock 14 via the cover glass 84. The indicator 15 and the date display unit 19 are visible.

  The electronic timepiece 100 includes a crown 16 and operation buttons 17 and 18 as shown in FIG. By manually operating the crown 16 and the operation buttons 17 and 18, the electronic timepiece 100 receives a satellite signal from at least one GPS satellite 20 and corrects the internal time information (time information acquisition mode). The mode can be set to one of a mode (position information acquisition mode) in which satellite signals from a plurality of GPS satellites 20 are received and positioning calculation is performed to correct the time difference of the internal time information. The electronic timepiece 100 can also execute the time information acquisition mode and the position information acquisition mode periodically (automatically).

FIG. 3 is a partial cross-sectional view showing the internal structure of the electronic timepiece 100, and FIG. 4 is an exploded perspective view of a part of the electronic timepiece 100.
As shown in FIG. 3, in the outer case 80, a cylindrical glass case 82 made of a non-conductive material such as ceramic is fitted into a cylindrical case body 81 made of a non-conductive material such as ceramic. Combined and configured. The outer case 80 has an opening K1 on the front surface side and an opening K2 on the back surface side. The opening K1 on the surface side of the outer case 80 is closed with a disk-shaped cover glass 84. The opening K2 on the back surface side of the outer case 80 is closed by a back cover 85 formed of a metal such as SU (stainless steel) or Ti (titanium) or other conductive material. The back cover 85 and the case body 81 are fixed by, for example, screw grooves or screws.

A ring-shaped dial ring 83 formed of a non-conductive material such as plastic is provided on the lower side (back side) of the cover glass 84 along the inner periphery of the glass edge 82. In addition, below the dial ring 83, a ground plate 38 made of a nonconductive material such as plastic is provided on the inner side of the inner periphery of the case body 81.
A donut-shaped storage space is defined by the base plate 38 and dial ring 83 and the inner periphery of the outer case 80. In this storage space, an annular antenna body 40 is stored. That is, the antenna body 40 is accommodated on the inner side of the inner periphery of the outer case 80, and the upper part thereof is covered with the dial ring 83. Also, in this storage space, an annular ground plate 90 formed of a conductive material such as metal is positioned between the antenna body 40 and the ground plane 38 (that is, opposite to the cover glass 84 when viewed from the antenna body 40). (Position on the side) that is kept at a predetermined distance from the antenna body 40.

Details of the antenna body 40 will be described with reference to FIGS. 5 and 6. FIG. 5A is a perspective view of the antenna body 40, and FIG. 5B is a plan view of the antenna body 40. FIG. 5C is a partial cross-sectional view of the antenna body 40 taken along the line Gg shown in FIG.
The antenna body 40 includes an annular dielectric 401 as a base material, an antenna pattern 402 and an antenna pattern 403 formed from a conductive material such as metal, and a power feeding unit 404 formed from a conductive material such as metal. Is formed by plating or silver paste printing. Hereinafter, the antenna pattern 403 may be referred to as an “antenna element”.

The dielectric 401 is formed so that the dielectric constant εr is about 5 to 20 by mixing a dielectric material that can be used at high frequencies such as titanium oxide with a resin.
As shown in FIG. 5C, the dielectric 401 has a pentagonal cross-sectional shape surrounded by an upper surface T1, an outer peripheral surface T2, a bottom surface T3, an upper inclined surface TP1, and a lower inclined surface TP2. Have. Hereinafter, the upper inclined surface TP1 may be referred to as an “inclined surface”. As shown in FIG. 5C, the upper inclined surface TP <b> 1 is an inclined surface that is provided on the inner periphery of the dielectric 401 and moves away from the cover glass 84 toward the center of the dielectric 401. Here, the center of the dielectric 401 is a ring-shaped center C of the antenna body 40 shown in FIGS. Although details will be described later, the pointer shaft 12 is provided so as to overlap the center C in plan view.

As shown in this figure, an antenna pattern 402 is formed on the upper surface T1 of the dielectric 401, and an antenna pattern 403 is formed on the upper inclined surface TP1. In addition, a power feeding portion 404 is formed on the upper inclined surface TP1, the lower inclined surface TP2, and the bottom surface T3 of the dielectric 401.
The power feeding unit 404 is connected to the power feeding pin 44 at the position P and is also connected to the antenna pattern 403. For this reason, the power supply unit 404 functions as a “power supply wiring” that electrically connects the power supply pin 44 and the antenna pattern 403 and supplies the potential supplied from the power supply pin 44 to the antenna pattern 403. Hereinafter, the position P where the power supply unit 404 and the power supply pin 44 are connected may be referred to as a “power supply position”.
Note that no potential is supplied to the antenna pattern 402 from the outside of the antenna body 40.

As shown in FIG. 5B, the antenna pattern 402 has a notch 405 and is formed in a shape in which a part of the annular shape is notched. The antenna pattern 402 has an antenna length that resonates with a radio wave (satellite signal) from a position information satellite.
The frequency of the radio wave from the GPS satellite 20 is about 1.575 GHz, and one wavelength is about 19 cm. In order to receive circularly polarized waves, an antenna length of about 1.0 to 1.3 times the wavelength (that is, the circumferential length of the antenna pattern 402) is required, so that radio waves from the GPS satellite 20 are received. For this purpose, a loop antenna of about 19 to 25 cm is required. When a loop antenna having such an antenna length is accommodated in the wristwatch, the wristwatch becomes large.
On the other hand, in this embodiment, the antenna body 40 is formed using the dielectric 401 having a relative dielectric constant εr of about 5 to 20 as a base material. When the dielectric 401 having the relative dielectric constant εr is used, the wavelength shortening rate by the dielectric 401 is (εr) ^−1/2 . That is, by providing the dielectric 401 having a relative dielectric constant of εr, the wavelength of the radio wave received by the antenna body is shortened to (εr) ^−½ times compared to the case without such a dielectric 401. be able to. That is, since the antenna body 40 according to the present embodiment includes the dielectric 401 having the relative dielectric constant εr, the antenna length of the antenna body 40 is (εr) ⁻¹ compared to the case where such a dielectric 401 is not provided. ^The antenna can be reduced in size.
As specific dimensions of the antenna pattern 402, an angle formed by the power feeding unit 404 and the notch 405 is Φa, a length of the notch 405 is Δk, a circumferential length of the antenna pattern 402 is L, and reception is performed. When the wavelength of the circularly polarized wave (that is, the wavelength after wavelength shortening) is λ, for example, L = 1.31λ, Φa = 40 °, and Δk = 0.018λ.

In addition, as shown in FIG. 5B, the antenna pattern 403 is a so-called C-shaped shape in which a part of a ring shape is cut out when the electronic timepiece 100 is viewed from a direction perpendicular to the dial 11 or the cover glass 84. The antenna pattern 402 is formed so as to maintain a constant interval (for example, an interval of about 0.01λ). These two antenna patterns 402 and 403 function as antenna elements that are electromagnetically coupled to each other and convert electromagnetic waves into current. By appropriately setting the length of the antenna pattern 403, it is possible to match the impedance with a circuit electrically connected to the antenna body 40.
In the following description, viewing the electronic timepiece 100 from a direction perpendicular to the dial plate 11 or the cover glass 84 may be expressed as “viewed in a plan view”.

With reference to FIG. 6 in addition to FIG. 5, the positional relationship between the antenna body 40, the feed pin 44, and the position P where the antenna body 40 and the feed pin 44 are connected will be described.
FIG. 6 is a plan view for explaining the positional relationship between the antenna body 40, the feeding pin 44, the outer case 80, the crown 16, the operation buttons 17 and 18, and the battery storage unit 28 in which the secondary battery 27 is stored. (The secondary battery 27 and the battery storage unit 28 will be described later).
As shown in FIGS. 5B and 6, when the antenna body 40 is viewed in plan, a curve representing the inner circumference of the antenna body 40 (strictly, a curve representing the inner circumference of the dielectric 401) is the first. The curve that represents the outer periphery of the antenna body 40 is referred to as a curve Cin, and is referred to as a second curve Cout. Further, as shown in FIGS. 5B and 6, a curve representing the center position of the first curve Cin and the second curve Cout when viewed in plan is referred to as a center curve Cmid. That is, the central curve Cmid is a curve that bisects the width of the antenna body 40 when the antenna body 40 is viewed in plan. Further, when viewed in plan, a region between the central curve Cmid and the first curve Cin is referred to as an inner region Ain, and a region between the central curve Cmid and the second curve Cout is referred to as an outer region Aout. A region surrounded by Cmid (a region on the inner side of the central curve Cmid in plan view) is referred to as a central region Amid. As is clear from these drawings, the inner area Ain is a part of the central area Amid.

As shown in FIGS. 5C and 6, the power supply pin 44 is provided so that the position P is located between the central curve Cmid and the first curve Cin when viewed in plan. In other words, the power feed pin 44 is disposed so that the position P is located in the inner region Ain and the central region Amid in plan view. Further, as shown in FIG. 5C, the power supply pin 44 is provided at a position where at least a part thereof overlaps the central region Amid when seen in a plan view. Further, as shown in FIG. 5C, the antenna pattern 403 and the power feeding unit 404 are included in the central region Amid when viewed in plan.
In the present embodiment, the power supply pin 44 is provided so that a part of the power supply pin 44 overlaps with the central area Amid and a part of the power supply pin 44 overlaps with the outer area Aout. May be provided so as to be included in the central region Amid, or may be provided so that the entire power supply pin 44 is included in the inner region Ain.

The description returns to FIGS. 3 and 4.
As shown in FIG. 3, inside the inner periphery of the antenna body 40, the light transmitting dial plate 11, the pointer shaft 12 penetrating the dial plate 11 and the ground plate 38, and the pointer shaft 12 are turned around. A plurality of hands 13 (second hand 13a, minute hand 13b, and hour hand 13c) indicating the current time are provided.
More specifically, as shown in FIG. 3, the pointer shaft 12 includes a shaft 12a, a shaft 12b, and a shaft 12c, the second hand 13a rotates around the shaft 12a, and the minute hand 13b moves around the shaft 12b. The hour hand 13c turns around the shaft 12c.
Although not shown in FIG. 3, on the inner side of the inner periphery of the antenna body 40, a shaft 141 that penetrates the dial plate 11 and the ground plate 38, and a pointer 142 and a pointer 143 that circulate around the shaft 141, In addition, a shaft 151 that passes through the dial 11 and the base plate 38 and a pointer 152 that goes around the shaft 151 are provided.
As described above, the pointer shaft 12 is provided at a position that overlaps the center C of the antenna body 40 when seen in a plan view, and extends in the front-back direction of the exterior case 80 along the central axis of the antenna body 40. Yes. Further, the shaft 141 and the shaft 151 extend in the front and back direction of the exterior case 80 (see FIG. 4).
The dial plate 11 is a circular plate material and is formed of a light-transmitting non-conductive material such as plastic. As shown in FIG. 3, the dial plate 11 is disposed between the cover glass 84 and the main plate 38. The dial 11 has a hole through which the pointer shaft 12 passes, a hole through which the shaft 141 passes (see FIG. 4), and a hole through which the shaft 151 passes (see FIG. 4). An opening 11a (see FIG. 2 and FIG. 4) for visually recognizing the image is formed.
The pointer 13, the pointers 142 and 143, and the pointer 152 are disposed inside the inner periphery of the antenna body 40 and between the cover glass 84 and the dial 11.

A drive mechanism (drive unit) 30 for driving the time display unit (the hands 13, hands 142 and 143, and the date display unit 19) is attached to the lower side (back side) of the base plate 38.
As shown in FIG. 3, in the present embodiment, the distance between the bottom surface T <b> 3 of the antenna body 40 and the cover glass 84 is longer than the distance between the drive mechanism 30 and the antenna body 40. That is, when the distance between the bottom surface T3 of the antenna body 40 and the cover glass 84 is ΔY1, and the distance between the drive mechanism 30 and the cover glass 84 is ΔY2, the relationship “ΔY1> ΔY2” is established.
When the antenna body 40 is provided at a position where the distance ΔY1 is longer than the distance ΔY2, the length of the antenna body 40 in the front and back direction can be increased as compared with the case where the antenna body 40 is provided at a position where the distance ΔY1 is shorter. The reception performance of the antenna body 40 is good when the cross-sectional area of the antenna body 40 is large. Since the antenna body 40 according to the present embodiment can increase the length of the antenna body 40 in the front and back direction and increase the cross-sectional area of the antenna body 40, the antenna body 40 is more than the dial 11 and the solar panel 87. As compared with the case of being arranged so as to be located on the surface side, it is possible to ensure good reception performance.
Further, when the distance ΔY1 is longer than the distance ΔY2, the height Δh of the portion where the antenna body 40 protrudes to the surface side from the dial plate 11 can be made smaller than when the distance ΔY1 is short. For this reason, the length of the dial ring 83 provided on the front surface side of the antenna body 40 can also be shortened. If the length of the dial ring 83 in the front and back direction is long, when the user of the electronic timepiece 100 views the dial 11 from the upper right direction in FIG. The end of the plate 11 cannot be visually recognized. On the other hand, in this embodiment, since the length of the dial ring 83 in the front and back directions is short, the user can visually recognize the dial 11 from a wide angle direction to every corner without being blocked by the dial ring 83. Is possible.

The drive mechanism 30 includes a plurality of step motors M1 to M5 and a plurality of wheel trains corresponding to each of the plurality of step motors M1 to M5. Each train wheel is composed of one or more gears. Hereinafter, the step motors M1 to M5 may be collectively referred to as the step motor M.
The drive mechanism 30 drives the plurality of hands 13 by rotating the pointer shaft 12. Specifically, the step motor M1 of the drive mechanism 30 rotates the shaft 12a through the train wheel so that the second hand 13a makes one round around the pointer shaft 12 in 60 seconds. Further, the step motor M2 of the drive mechanism 30 rotates the shaft 12b through the train wheel so that the hour hand 13c makes one turn around the pointer shaft 12 in 12 hours, and the minute hand 13b moves around the pointer shaft 12. The shaft 12c is rotated so as to make one round in 60 minutes. The step motor M3 of the drive mechanism 30 drives the hands 142 and 143 by rotating the shaft 141 via the train wheel. The step motor M4 of the drive mechanism 30 drives the pointer 152 by rotating the shaft 151 via the train wheel. The step motor M5 of the drive mechanism 30 drives the date display unit 19 so as to switch the display of the date display unit 19 via the train wheel. Thus, the drive mechanism 30 drives the time display unit.

The electronic timepiece 100 also includes a substrate 25 inside the exterior case 80. The substrate 25 is formed of a material including a resin or a dielectric, and is disposed below the drive mechanism 30 (that is, between the drive mechanism 30 and the back cover 85).
A circuit block including a GPS receiver (wireless receiver) 26 and a controller 70 is mounted on the lower surface (back surface) of the substrate 25. The GPS receiving unit 26 is configured by, for example, a one-chip IC module, and includes an analog circuit and a digital circuit. The controller 70 sends a control signal to the GPS receiver 26 to control the reception operation of the GPS receiver 26 and to control the operation of the drive mechanism 30.

On the upper side of the substrate 25, power supply pins 44 made of metal or other conductive material are provided. The power feed pin 44 incorporates a spring and is provided so as to contact the substrate 25 and the power feed portion 404 of the antenna body 40 through an insertion hole opened in the ground plate 38 and the ground plate 90.
The power feeding unit 404 of the antenna body 40 is electrically connected to the substrate 25 (strictly, wiring provided on the substrate 25) via the power feeding pin 44, and the GPS receiving unit 26 provided on the substrate 25 is connected to the antenna receiving unit 404. A predetermined potential is supplied from a constant potential generation circuit provided.
In the present embodiment, the substrate 25 and the power supply unit 404 are electrically connected by the power supply pin 44, but the power supply pin 44 is only an example of a power supply member that electrically connects the substrate 25 and the power supply unit 404. Absent. Instead of the power supply pin 44, the substrate 25 and the power supply unit 404 may be electrically connected by a member formed of a conductive material, such as a lead wire or a leaf spring.

  The circuit block including the GPS receiving unit 26 and the control unit 70 is covered with a shield 91 formed of a conductive material. The shield 91 is supplied with the ground potential of the circuit block. Further, the shield 91 is electrically connected to the back cover 85 via the circuit retainer 39. The back cover 85 is electrically connected to the ground plate 90 through a connection portion (not shown) formed of a conductive material such as metal. For this reason, the ground potential of the circuit block is supplied to the ground plate 90 via the shield 91, the back cover 85, and the connection portion. Thereby, the back cover 85 and the ground plate 90 function as a ground plane of the antenna body 40.

  Between the drive mechanism 30 and the ground plane 38, a magnetic-resistant plate S1 and a magnetic-resistant plate S2 are provided, and between the drive mechanism 30 and the substrate 25, a magnetic-resistant plate S3 is provided. Hereinafter, the antimagnetic plate S1 and the antimagnetic plate S2 may be collectively referred to as a first antimagnetic plate, and the antimagnetic plate S3 may be referred to as a second antimagnetic plate. These anti-magnetic plates S1 to S3 are made of a conductive material having a high magnetic permeability such as pure iron.

When an object that generates a strong magnetic field such as a speaker exists outside the electronic timepiece 100, the step motor M may malfunction due to the influence of the magnetic field. Further, among various components constituting the electronic timepiece 100, a metal such as the back cover 85 generates a magnetic field when magnetized. Furthermore, the circuit block provided on the substrate 25 may generate a magnetic field.
In this embodiment, the drive motor 30 is magnetically shielded by covering the step motor M with magnetic-resistant plates S1 to S3 formed of a material having high magnetic permeability, and the step motor is caused by the various magnetic fields described above. M is prevented from malfunctioning.

The electronic timepiece 100 also includes a cylindrical secondary battery 27 such as a lithium ion battery, a battery storage unit 28 for storing the secondary battery 27, and a solar panel 87 that performs photovoltaic power generation inside the exterior case 80. Is provided.
The solar panel 87 is a circular flat plate in which a plurality of solar cells (photovoltaic elements) that convert light energy into electric energy (electric power) are connected in series. The solar panel 87 is disposed between the main plate 38 and the dial 11 inside the inner periphery of the antenna body 40. A hole through which the pointer shaft 12 passes, a hole through which the shaft 141 passes (see FIG. 4), and a hole through which the shaft 151 passes (see FIG. 4) are formed at the center of the solar panel 87. An opening 87a (see FIGS. 2 and 4) for visually recognizing the display unit 19 is formed.
The secondary battery 27 is charged with electric power generated by the solar panel 87. The battery storage unit 28 for storing the secondary battery 27 is disposed below the substrate 25 (that is, between the substrate 25 and the back cover 85).

On the outside of the outer case 80, a crown 16, an operation button 17, and an operation button 18 are provided (see FIG. 2). The movement of the crown 16 caused by the user of the electronic timepiece 100 operating the crown 16 is transmitted to the drive mechanism 30 via the winding stem 16 a penetrating the exterior case 80. Further, the movement of the operation button 17 (or operation button 18) generated when the user of the electronic timepiece 100 presses the operation button 17 (or operation button 18) causes the button shaft 17 a (or button to penetrate the outer case 80). It is transmitted to a switch (not shown) via the shaft 18a) (see FIG. 6). The switch converts the pressure from the operation button 17 (or the operation button 18) into an electrical signal and transmits the electrical signal to the control unit 70.
Hereinafter, the crown 16, the winding stem 16a, the operation buttons 17 and 18, and the button shafts 17a and 18a may be collectively referred to as an operation unit.

  As shown in FIG. 6, the battery housing portion 28 is disposed at a position that does not overlap the antenna body 40 when viewed in plan. Further, the power supply pin 44 is disposed at a position that does not overlap with the battery housing portion 28 when viewed in plan.

The secondary battery 27 absorbs or reflects electromagnetic waves including radio waves (satellite signals) from the GPS satellite 20. Therefore, when the secondary battery 27 is located in the vicinity of the antenna body 40, the secondary battery 27 absorbs or reflects radio waves that the antenna body 40 could receive if the secondary battery 27 is not present. For this reason, the antenna body 40 cannot maintain good reception performance.
In particular, the gain of the antenna body 40 is maximized in the direction in which the power feeding unit 404 is provided when viewed from the center of the antenna body 40 (that is, the direction in which the power feeding unit 404 is provided as viewed from the center of the antenna body 40). Corresponds to the maximum radiation direction of the antenna body 40). Therefore, when the power feeding pin 44 connected to the power feeding unit 404 is located in the vicinity of the secondary battery 27, the reception performance of the antenna body 40 is greatly deteriorated.
The magnitude of the influence of the secondary battery 27 on the reception performance of the antenna body 40 is such that the distance between the secondary battery 27 and the antenna body 40 is short, or the secondary battery 27 and the feed pin 44. Increases when the distance to is short.

On the other hand, in the present embodiment, the antenna body 40 is arranged at a position where it does not overlap the secondary battery 27 in plan view, and the power supply pin 44 does not overlap with the secondary battery 27 in plan view. It is arranged in the position.
That is, in the present embodiment, the distance between the antenna body 40 and the secondary battery 27 can be increased as compared with the case where the antenna body 40 and the secondary battery 27 overlap in plan view. Further, in the present embodiment, the distance between the power supply pin 44 and the secondary battery 27 can be increased as compared with the case where the power supply pin 44 and the secondary battery 27 overlap in plan view. Therefore, in this embodiment, the influence which the secondary battery 27 has on the reception performance of the antenna body 40 can be suppressed to a small level, and the reception performance of the antenna body 40 can be kept good.

  For structural reasons, the battery storage unit 28 cannot be disposed at a position overlapping the operation unit (more specifically, the winding stem 16a of the operation unit) in plan view. Further, the power supply pin 44 cannot be disposed at a position overlapping the operation unit (more specifically, the winding stem 16a, the button shaft 17a, and the button shaft 18a in the operation unit) in a plan view. Therefore, the battery storage unit 28 and the power supply pin 44 are arranged so as not to overlap the operation unit in plan view. For structural reasons, the battery storage unit 28 is arranged so as not to overlap with a circuit block (not shown in FIG. 7) including the GPS reception unit 26 and the control unit 70 in plan view.

In the present embodiment, as shown in FIG. 6, the battery housing portion 28 is provided so that the center of the secondary battery 27 is positioned in the 12 o'clock direction, and the power feed pin 44 is provided in the 9 o'clock direction. Yes.
The electronic timepiece 100 can receive satellite signals outdoors. Also, the electronic timepiece 100 is often worn on the user's arm outdoors, and the user of the electronic timepiece 100 points the arm downward (that is, opposite to the zenith direction) outdoors. Often has a posture. Thus, outdoors, the 9 o'clock direction as viewed from the center of the electronic timepiece 100 (pointer shaft 12) is likely to be a direction close to the zenith direction.
In the present embodiment, the power supply pin 44 is provided in the 9 o'clock direction. As described above, the gain of the antenna body 40 is maximized in the direction in which the power supply unit 404 is provided, that is, in the direction in which the power supply pin 44 is connected, as viewed from the center of the antenna body 40. Therefore, in this embodiment, the possibility that the maximum radiation direction of the antenna body 40 is directed to the zenith direction can be increased outdoors where the electronic timepiece 100 receives satellite signals, and the reception performance of the antenna body 40 is kept good. It becomes possible.

  Next, the positional relationship between the antenna body 40 and the power feed pin 44 and the antimagnetic plates S1 to S3 will be described with reference to FIGS. FIG. 7 is an explanatory diagram showing the positional relationship between the antenna body 40, the magnetic plate S1, the magnetic plate S2, and the step motors M1 to M5 when viewed in a plan view. FIG. 8 is an explanatory diagram showing the positional relationship between the antenna body 40, the magnetic plate S3, and the step motors M1 to M5.

  As shown in FIG. 7, the antimagnetic plate S <b> 1 and the antimagnetic plate S <b> 2 are provided so as to overlap at least a part of each step motor M in plan view. Further, as shown in FIG. 8, the antimagnetic plate S <b> 3 is provided so as to overlap with at least a part of each step motor M in plan view. Thereby, each step motor M is shielded magnetically from the magnetic field emitted from the outside of the drive mechanism 30, and it becomes possible to prevent malfunction of the step motor M caused by the magnetic field.

However, on the other hand, the magnetic resistant plates S1 to S3 absorb electromagnetic waves including radio waves (satellite signals) from the GPS satellite 20. Therefore, when the electronic timepiece 100 is provided with the magnetic resistant plates S1 to S3, compared to the case where the magnetic resistant plates S1 to S3 are not provided, the strength of the radio wave received by the antenna body 40 among the radio waves from the GPS satellite 20 is reduced. The reception performance of the body 40 may deteriorate. The degree of influence on the reception performance of the antenna body 40 increases as the magnetic-resistant plate and the antenna body 40 become closer to each other.
In the present embodiment, as shown in FIGS. 7 and 8, the antenna body 40 is disposed at a position that does not overlap with the antimagnetic plates S <b> 1 to S <b> 3 in plan view. In this case, the distance between the antenna body 40 and the magnetic resistant plates S1 to S3 can be increased as compared with the case where the antenna body 40 is provided at a position overlapping the magnetic resistant plates S1 to S3 in plan view. Therefore, in this embodiment, it is possible to suppress the influence of the magnetic-resistant plates S1 to S3 (particularly, the magnetic-resistant plate S1) on the reception performance of the antenna body 40, and to keep the reception performance of the antenna body 40 favorable. .

  In the present embodiment, the power supply pin 44 is arranged in the 9 o'clock direction when viewed from the pointer shaft 12. As shown in FIGS. 7 and 8, the magnetic-resistant plates S <b> 1 to S <b> 3 as a whole are arranged at positions deviated from the center of the electronic timepiece 100 toward the 3 o'clock direction as viewed from the pointer shaft 12. Yes. Therefore, by arranging the power feeding pin 44 in the 9 o'clock direction, compared to the case where the power feeding pin 44 is arranged in a direction other than 9 o'clock (for example, 3 o'clock direction), the power feeding pin 44 and the magnetic plates S1 to S3. The distance between can be increased. Thereby, it is possible to keep the reception performance of the antenna body 40 good by suppressing the influence of the magnetic resistant plates S1 to S3 on the reception performance of the antenna body 40 to a small extent.

<B: Circuit configuration of electronic timepiece with built-in antenna>
FIG. 9 is a block diagram showing a circuit configuration of the electronic timepiece 100. As shown in FIG. 9, the electronic timepiece 100 includes a GPS receiving unit 26 and a control display unit 36. The GPS receiver 26 performs processing such as satellite signal reception, GPS satellite 20 acquisition, position information generation, and time correction information generation. The control display unit 36 performs processing such as holding internal time information and correcting internal time information.

  The solar panel 87 charges the secondary battery 27 through the charge control circuit 29. The electronic timepiece 100 includes regulators 34 and 35, and the secondary battery 27 supplies drive power to the control display unit 36 via the regulator 34 and to the GPS reception unit 26 via the regulator 35. The electronic timepiece 100 also includes a voltage detection circuit 37 that detects the voltage of the secondary battery 27. In place of the regulator 35, for example, a regulator that supplies driving power to the RF unit 50 (details will be described later), and a regulator (both not shown) that supplies driving power to the baseband unit 60 (details will be described later). It may be provided separately.

  The electronic timepiece 100 includes an antenna body 40 and a SAW (Surface Acoustic Wave) filter 32. As described in FIG. 1, the antenna body 40 receives satellite signals from the plurality of GPS satellites 20. However, since the antenna body 40 also receives some unnecessary radio waves other than the satellite signal, the SAW filter 32 performs a process of extracting the satellite signal from the signal received by the antenna body 40. That is, the SAW filter 32 is configured as a band-pass filter that passes a 1.5 GHz band signal.

  The GPS receiving unit 26 includes an RF (Radio Frequency) unit 50 and a baseband unit 60. As will be described below, the GPS receiver 26 performs a process of acquiring satellite information such as orbit information and GPS time information included in the navigation message from the 1.5 GHz band satellite signal extracted by the SAW filter 32.

  The RF unit 50 includes an LNA (Low Noise Amplifier) 51, a mixer 52, a VCO (Voltage Controlled Oscillator) 53, a PLL (Phase Locked Loop) circuit 54, an IF amplifier 55, an IF (Intermediate Frequency) filter 56, an ADC (ADC). A / D converter) 57 and the like.

  The satellite signal extracted by the SAW filter 32 is amplified by the LNA 51. The satellite signal amplified by the LNA 51 is mixed with the clock signal output from the VCO 53 by the mixer 52 and down-converted to an intermediate frequency band signal. The PLL circuit 54 compares the phase of the clock signal obtained by dividing the output clock signal of the VCO 53 with the reference clock signal, and synchronizes the output clock signal of the VCO 53 with the reference clock signal. As a result, the VCO 53 can output a clock signal with a stable frequency accuracy of the reference clock signal. For example, several MHz can be selected as the intermediate frequency.

  The signal mixed by the mixer 52 is amplified by the IF amplifier 55. Here, by the mixing in the mixer 52, a high-frequency signal of several GHz is generated together with the signal in the intermediate frequency band. Therefore, the IF amplifier 55 amplifies a high frequency signal of several GHz along with the signal in the intermediate frequency band. The IF filter 56 passes the signal in the intermediate frequency band and removes the high frequency signal of several GHz (precisely, attenuates below a predetermined level). The intermediate frequency band signal that has passed through the IF filter 56 is converted into a digital signal by an ADC (A / D converter) 57.

  The baseband unit 60 includes a DSP (Digital Signal Processor) 61, a CPU (Central Processing Unit) 62, an SRAM (Static Random Access Memory) 63, and an RTC (Real Time Clock) 64. The baseband unit 60 is connected to a crystal oscillation circuit with temperature compensation circuit (TCXO: Temperature Compensated Crystal Oscillator) 65, a flash memory 66, and the like.

  A crystal oscillation circuit (TCXO) 65 with a temperature compensation circuit generates a reference clock signal having a substantially constant frequency regardless of the temperature. The flash memory 66 stores, for example, time difference information. The time difference information is information in which time difference data (such as a correction amount for UTC associated with coordinate values (for example, latitude and longitude)) is defined.

  When set to the time information acquisition mode or the position information acquisition mode, the baseband unit 60 performs a process of demodulating the baseband signal from the digital signal (intermediate frequency band signal) converted by the ADC 57 of the RF unit 50.

  In addition, when the time information acquisition mode or the position information acquisition mode is set, the baseband unit 60 generates a local code having the same pattern as each C / A code in the satellite search process described later, and generates a baseband signal. A process of correlating each C / A code included and the local code is performed. Then, the baseband unit 60 adjusts the local code generation timing so that the correlation value for each local code has a peak, and if the correlation value is equal to or greater than the threshold, it synchronizes with the GPS satellite 20 of that local code (that is, The GPS satellite 20 is captured). Here, the GPS system employs a CDMA (Code Division Multiple Access) method in which all GPS satellites 20 transmit satellite signals of the same frequency using different C / A codes. Therefore, by detecting the C / A code included in the received satellite signal, it is possible to search for a GPS satellite 20 that can be captured.

  Further, the baseband unit 60 uses a local code having the same pattern as the C / A code of the GPS satellite 20 in order to acquire the satellite information of the captured GPS satellite 20 in the time information acquisition mode or the position information acquisition mode. Performs processing to mix baseband signals. In the mixed signal, a navigation message including satellite information of the captured GPS satellite 20 is demodulated. Then, the baseband unit 60 detects TLM words (preamble data) of each subframe of the navigation message, and acquires satellite information such as orbit information and GPS time information included in each subframe (for example, stored in the SRAM 63). ) Process. Here, the GPS time information is the week number data (WN) and the Z count data, but may be only the Z count data when the week number data has been acquired previously. And the baseband part 60 produces | generates the time correction information required in order to correct internal time information based on satellite information.

  In the time information acquisition mode, more specifically, the baseband unit 60 performs time measurement calculation based on the GPS time information, and generates time correction information. The time correction information in the time information acquisition mode may be, for example, GPS time information itself or information on a time difference between the GPS time information and the internal time information.

On the other hand, in the position information acquisition mode, more specifically, the baseband unit 60 performs positioning calculation based on GPS time information and orbit information, and the position information (more specifically, the electronic timepiece 100 is Get the latitude and longitude of the location. Further, the baseband unit 60 refers to the time difference information stored in the flash memory 66 and acquires time difference data associated with the coordinate values (for example, latitude and longitude) of the electronic timepiece 100 specified by the position information. . In this way, the baseband unit 60 generates satellite time data (GPS time information) and time difference data as time correction information. As described above, the time correction information in the position information acquisition mode may be the GPS time information and the time difference data itself. For example, instead of the GPS time information, the time correction information is a time difference data between the internal time information and the GPS time information. Also good.
The baseband unit 60 may generate time correction information from the satellite information of one GPS satellite 20, or may generate time correction information from the satellite information of a plurality of GPS satellites 20.

  The operation of the baseband unit 60 is synchronized with the reference clock signal output from the crystal oscillation circuit with temperature compensation circuit (TCXO) 65. The RTC 64 generates timing for processing satellite signals. The RTC 64 is counted up by the reference clock signal output from the TCXO 65.

The control display unit 36 includes a control unit 70, a drive circuit 74, and a crystal resonator 73.
The control unit 70 includes a storage unit 71 and an RTC (Real Time Clock) 72 and performs various controls. The control unit 70 can be configured by a CPU, for example. The controller 70 sends a control signal to the GPS receiver 26 and controls the reception operation of the GPS receiver 26. Further, the control unit 70 controls the operation of the regulator 34 and the regulator 35 based on the detection result of the voltage detection circuit 37. The control unit 70 controls the driving of all the hands 13 through the driving circuit 74 and controls the driving of the hands 142 and 143 and the date display unit 19 through the driving circuit 74.

  The storage unit 71 stores received data. The control unit 70 corrects the internal time information based on the received data. The internal time information is time information counted by the electronic timepiece 100, is counted by the RTC 72 that is constantly driven, and is updated by a reference clock signal generated by the crystal unit 73. Therefore, even if the power supply to the GPS receiver 26 is stopped, the internal time information can be updated and the hand movement of the pointer can be continued.

  When the time information acquisition mode is set, the control unit 70 controls the operation of the GPS receiving unit 26, corrects the internal time information based on the GPS time information, and stores the internal time information in the storage unit 71. More specifically, the internal time information is corrected to UTC (Coordinated Universal Time) obtained by adding a UTC offset to the acquired GPS time information. Further, when the position information acquisition mode is set, the control unit 70 controls the operation of the GPS receiving unit 26, corrects and stores the internal time information based on the satellite time data (GPS time information) and the time difference data. Store in the unit 71.

<C: Advantages of the embodiment>
As described above, in the present embodiment, the outer case 80 is formed of a nonconductive material.
If the outer case 80 is formed of a conductive material such as metal, the outer case 80 absorbs electromagnetic waves including radio waves from the GPS satellites 20, and the radio waves that the antenna body 40 should originally receive are external. The case 80 is blocked. In this case, the antenna body 40 cannot exhibit good reception performance.
On the other hand, in this embodiment, since the outer case 80 is formed of a non-conductive material, radio waves from the GPS satellite 20 are not blocked by the outer case 80, and the antenna body 40 has good reception performance. Can be achieved.

Even when the exterior case 80 is formed of a conductive material such as metal, the antenna body 40 is provided as close to the surface side as possible, for example, the cover glass 84 side of the dial plate 11. It is possible to maintain good reception performance. However, when the antenna body 40 is provided closer to the cover glass 84 than the dial plate 11, the thickness of the electronic timepiece 100 increases in the front and back direction, which increases the size of the electronic timepiece 100 and restricts the design. Further, when the antenna body 40 is provided on the cover glass 84 side of the dial plate 11, the dial ring 83 provided on the cover glass 84 side of the antenna body 40 protrudes largely on the cover glass 84 side of the dial plate 11. The user of the electronic timepiece 100 may be blocked by the dial ring 83 and cannot visually recognize the end portion of the dial plate 11.
On the other hand, in this embodiment, since the exterior case 80 is formed of a non-conductive material, the antenna body 40 can be formed so as to sink deeper into the back side than the dial 11. That is, the antenna body 40 is provided such that the distance ΔY1 between the bottom surface T3 of the antenna body 40 and the cover glass 84 is larger than the distance ΔY2 between the drive mechanism 30 and the cover glass 84. As a result, it is possible to reduce the height Δh of the portion where the antenna body 40 protrudes from the dial 11 toward the cover glass 84. As a result, the visibility of the dial 11 by the user can be improved, the electronic timepiece 100 can be thinned, and the design of the electronic timepiece 100 can be improved.

  Further, according to the present embodiment, the antenna body 40 is formed so as to sink deeper into the back surface side than the dial plate 11. Can be lengthened. As a result, the cross-sectional area of the antenna body 40 can be increased, and good reception performance of the antenna body 40 can be ensured.

In the present embodiment, a ground plate 90 is provided between the antenna body 40 and the ground plane 38. Therefore, even when the exterior case 80 is formed of a non-conductive material and the exterior case 80 cannot function as a ground plane, the reception performance of the antenna body 40 can be kept good.
Further, in the present embodiment, since the ground plate 90 is electrically connected to the back cover 85, the potential of the ground plate 90 is stabilized, and the reception performance of the antenna body 40 can be maintained well.

  Further, in the present embodiment, since the antenna body 40 has the upper inclined surface TP1, the dial ring 83 provided on the surface side of the antenna body 40 can also have a shape having an inclined surface. As a result, the user of the electronic timepiece 100 can visually recognize the dial 11 from a wide angle direction to every corner without being blocked by the dial ring 83.

<Modification>
The present invention is not limited to the above-described embodiments, and various modifications as described below are possible, for example. Moreover, the aspect of the deformation | transformation described below can also combine suitably arbitrarily selected 1 or several.

<Modification 1>
In the above-described embodiment, the ground plate 90 is provided at a position that keeps a predetermined distance from the antenna body 40 and is separated from the antenna body 40, but is provided directly on the surface of the antenna body 40. May be.
For example, the electronic timepiece 100 may include a ground plate 90a shown in FIG. 10A is a perspective view of the antenna body 40 and the ground plate 90a formed on the antenna body 40, and FIG. 10B is a partial cross-sectional view of the antenna body 40 and the ground plate 90a. The ground plate 90a is made of a conductive material such as metal, and is formed on the outer peripheral surface T2 and the bottom surface T3 of the dielectric 401 included in the antenna body 40 by plating or silver paste printing. When the ground plate 90a is formed directly on the surface of the antenna body 40, the electronic timepiece 100 can be further reduced in size and thickness as compared with the case where the ground plate 90a is provided apart from the antenna body 40.

<Modification 2>
In the embodiment and the modification described above, the antenna body 40 includes the parasitic antenna pattern 402 and the antenna pattern 403 that receives a predetermined potential. However, the present invention is limited to such a configuration. Instead of this, it may be possible to provide only an antenna pattern that is supplied with a predetermined potential without providing a parasitic antenna pattern.
For example, the electronic timepiece 100 may include an antenna body 40a shown in FIG. 11A is a perspective view of the antenna body 40a according to the second modification, FIG. 11B is a plan view of the antenna body 40a, and FIG. 11C shows the antenna body 40a in FIG. It is the partial sectional view cut | disconnected by the GG line | wire shown in FIG.
As shown in FIG. 11, in the antenna body 40a, an antenna pattern 403a that receives power of a predetermined potential from the power feed pin 44 via the power feed portion 404c is formed on the upper surface T1 of the dielectric 401. The antenna body 40a is set to an antenna length such that the antenna pattern 403a resonates with a satellite signal, and does not include a parasitic antenna pattern. In this figure, the antenna pattern 403a is formed in a C shape having a notch 405a, but is formed in an annular shape (O shape) without the notch 405a. It may be a thing.

<Modification 3>
In the embodiment and the modification described above, the antenna body 40 (or 40a) has a pentagonal cross-sectional shape surrounded by the upper surface T1, the outer peripheral surface T2, the bottom surface T3, the upper inclined surface TP1, and the inclined surface TP2. Although the dielectric 401 is formed as a base material, the dielectric serving as the base material of the antenna body may have a cross-sectional shape other than a pentagon.
For example, the electronic timepiece 100 may include an antenna body 40b shown in FIG. FIG. 12 is a perspective view of an antenna body 40b according to the third modification. The antenna body 40b includes a dielectric 401b having a quadrangular cross-sectional shape surrounded by an upper surface T1, an outer peripheral surface T2, a bottom surface (not shown), and an inner peripheral surface T4 as a base material, and is formed on the upper surface T1 of the dielectric 401b. Antenna patterns 402b and 403b are formed, and a power feeding portion 404b is formed on the top surface T1, the inner peripheral surface T4, and the bottom surface of the dielectric 401b.

<Modification 4>
In the above-described embodiments and modifications, the antenna pattern and the power feeding unit are formed on the surface of the dielectric by plating or silver paste printing, but part or all of the antenna pattern and the power feeding unit are dielectric. It may be embedded in the body.
For example, the electronic timepiece 100 may include an antenna body 40c shown in FIG. FIG. 13 is a partial cross-sectional view of an antenna body 40c according to Modification 4. In the antenna body 40c, the antenna pattern 402c and the antenna pattern 403c are embedded in the dielectric 401c, and a part of the power feeding unit 404c is embedded in the dielectric 401c. Such a structure can be manufactured by insert molding. According to the insert molding, the antenna body can be manufactured at a lower cost than the case where the antenna pattern is formed by plating or silver paste printing. In addition, the dielectric 401c which is a base material of the antenna body 40c has a cross-sectional shape including an inner peripheral surface T4 instead of the lower inclined surface TP2.

<Modification 5>
In the above-described embodiment and Modifications 1 to 3, the antenna pattern and the power feeding part are formed on the surface of the dielectric, but part or all of the antenna pattern and the power feeding part are pasted on the flexible tape. It may be a thing.
For example, the electronic timepiece 100 may include an antenna body 40d shown in FIG. FIG. 14 is a partial cross-sectional view of an antenna body 40d according to Modification 5. The antenna body 40d has a structure in which a flexible tape 500 (flexible substrate) to which the antenna pattern 402d, the antenna pattern 403d, and the power feeding unit 404d are attached is attached to the dielectric 401c.
These structures can be manufactured by, for example, forming an antenna pattern and a power feeding portion on a flexible tape in advance, and then sticking the flexible tape to a dielectric that is a base material. According to this manufacturing method, the antenna body can be manufactured at a lower cost than when the antenna pattern or the like is formed by plating or silver paste printing.

In the embodiment and the modification described above, the antenna body and the substrate are electrically connected by the power supply pin 44, but may be electrically connected by a power supply member other than the power supply pin 44. Good.
For example, as shown in FIG. 14, the antenna body and the substrate are formed by a feeding member 44 d made of a conductive material such as metal, which is affixed on the surface of a portion 500 a that protrudes below the antenna body 40 f of the flexible tape 500. May be electrically connected.
In such a structure, for example, a feeding member is formed on a flexible tape on which an antenna pattern and a feeding portion are formed, and the flexible tape is attached to a dielectric material as a base material, and the protruding portion 500a of the flexible tape 500 is a substrate. The electronic timepiece 100 can be manufactured at a lower cost than the case where the power supply pin 44 is provided.

<Modification 6>
In the embodiment and the modification described above, the antenna body has a circular shape in plan view as shown in FIG. 5B, for example, but may have a shape other than a circle.
For example, the electronic timepiece 100 may include the antenna body 40e shown in FIG. FIG. 15 is a plan view of an antenna body 40e according to Modification 6. As shown in FIG. 15, the antenna body 40e is connected to a feeding member such as the antenna pattern 402e, the antenna pattern 403e, and the feeding pin 44 on the surface of the dielectric 401e having a rectangular hollow shape in plan view. A power feeding unit 404e is formed.

<Modification 7>
In the embodiment and the modification described above, the electronic timepiece 100 (or the electronic timepiece 100a) includes the three magnetic resistant plates S1 to S3, but may not include the three magnetic resistant plates S1 to S3. Further, the electronic timepiece 100 may include one or two of the three anti-magnetic plates.

<Modification 8>
In the embodiment and the modification described above, the operation unit of the electronic timepiece 100 (100a) includes the crown 16, the winding stem 16a, the operation buttons 17 and 18, and the button shafts 17a and 18a. Only some of them may be provided, or elements other than these may be included.

<Modification 9>
In the embodiment and the modification described above, the time display unit includes the dial 11, the pointer shaft 12, the pointer 13, the small clock 14, the indicator 15, and the date display unit 19, but the present invention is in such a mode. The time display unit may include only the pointer shaft 12 and the pointer 13 without being limited thereto.
When the time display unit does not include the small clock 14, the indicator 15, and the date display unit 19, the drive mechanism 30 includes step motors M1 and M2 that drive the pointer shaft 12 among the plurality of step motors M1 to M5. What is necessary is just to provide, and it is not necessary to provide the step motor M3-M5 for driving the axis | shaft 141, the axis | shaft 151, and the date display part 19. FIG. In this case, the antimagnetic plates S1 to S3 may be provided in a range that covers part or all of the step motors M1 and M2.

<Modification 10>
In the embodiment and the modification described above, the time display unit includes the dial 11, the pointer shaft 12, and the pointer 13 (or, in addition to these, the small clock 14, the indicator 15, and the date display unit 19). However, the time display unit may further include a liquid crystal panel.
The time display unit may include a liquid crystal panel instead of the dial plate 11, the pointer shaft 12, and the pointer 13. That is, the electronic timepiece 100 may be a digital type electronic timepiece with a built-in antenna. In this case, the electronic timepiece 100 may be configured without the antimagnetic plates S1 to S3.

<Modification 11>
In the embodiment and the modification described above, the outer case 80 is entirely formed of a non-conductive material, but a part of the outer case 80 may be formed of a conductive material such as metal. . In this case, it is preferable that a portion of the outer case 80 formed of a conductive material is provided closer to the back cover 85 than the antenna pattern included in the antenna body 40.

<Modification 12>
In the embodiment and the modification described above, the electronic timepiece 100 receives a radio wave from a position information satellite such as the GPS satellite 20, but is not limited to a radio wave from the position information satellite, for example, a 900 MHz band radio wave for a wireless tag. It may be an electronic timepiece that receives. Further, for example, an electronic timepiece that receives a 2.4 GHz band radio wave such as Bluetooth (registered trademark) may be used.

<Modification 13>
In the embodiment and the modification described above, the electronic timepiece 100 is a wristwatch, but the electronic timepiece 100 may be a timepiece other than a wristwatch, for example, a pocket watch or a table clock. Further, the present invention may be applied to various electronic devices having an electronic timepiece function (for example, a mobile phone or a digital camera).

100 …… Electronic clock with built-in antenna, 11 …… Dial plate, 12 …… Pointer shaft, 13 (13a, 13b, 13c) …… Pointer, 16 …… Tunu, 16a …… Makima, 26 …… GPS receiver 27 …… Secondary battery, 28 …… Battery housing, 30 …… Drive mechanism, 38 …… Ground plate, 40 …… Antenna body, 44 …… Power supply pin, 70 …… Control unit, 80 …… Exterior case, 81: Case body, 82: Glass edge, 83: Dial ring, 84: Cover glass, 85 ... Back cover, 87 ... Solar panel, 90 ... Ground plate.

Claims (6)

A cylindrical outer case at least partially formed of a non-conductive member;
A cover glass that closes one of the two openings of the outer case; and
An annular antenna body provided along the inner periphery of the outer case;
An annular ground plate formed of a conductive member and spaced apart from the antenna body by a predetermined distance on the opposite side of the cover glass as viewed from the antenna body;
Of the two openings of the outer case, a back cover that closes the other opening;
A connecting portion for electrically connecting the ground plate and the back cover;
Comprising
An electronic timepiece with a built-in antenna. A cylindrical outer case at least partially formed of a non-conductive member;
A cover glass that closes one of the two openings of the outer case; and
An annular antenna body provided along the inner periphery of the outer case;
A ground plate formed of a conductive member on the surface of the antenna body;
Of the two openings of the outer case, a back cover that closes the other opening;
A connecting portion for electrically connecting the ground plate and the back cover;
Comprising
An electronic timepiece with a built-in antenna. A time display unit arranged inside the outer case and capable of displaying the time;
A drive unit that is disposed at least partially inside the antenna body and drives the time display unit;
Comprising
The electronic timepiece with a built-in antenna according to claim 1 or 2. The distance between the cover glass and the drive unit is
Shorter than the distance between the cover glass and the bottom surface of the antenna body,
The electronic timepiece with a built-in antenna according to claim 3. The antenna body is
An annular dielectric,
An antenna element formed of a conductive member and provided on the surface of the dielectric;
With
The dielectric is
Provided on the inner periphery of the dielectric, and has an inclined surface that moves away from the cover glass toward the center of the dielectric,
The electronic timepiece with built-in antenna according to any one of claims 1 to 4 . The dielectric is
An upper surface continuous with the inclined surface;
The antenna element is
Provided on the upper surface of the dielectric;
The electronic timepiece with a built-in antenna according to claim 5 .

Images