JP2016128838A - Antenna built-in type electronic timepiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact antenna built-in type electronic timepiece which can sufficiently maintain high GPS reception performance and enhance degree of freedom for developing different models.SOLUTION: An antenna built-in type electronic timepiece comprises: a cylindrical external case 80 which is formed with a non-conductive member in at least a part of the case; a dial 11 which displays time inside the external case 80; a driver 30 which drives the dial 11 inside the external case 80; an antenna body 40 which is disposed around the driver 30 inside the external case 80 and which has a shape formed by notching a part of an annular shape; cover glass 84 which covers one opening out of two openings of the external case 80; and a circuit board 25 which is installed in the external case 80 and comprises a GPS reception unit 26 for performing wireless communication. The antenna body 40 is disposed closer to the cover glass 84 side than the circuit board 25, and the GPS reception unit 26 is disposed on a back cover 85 side of the circuit board 25.SELECTED DRAWING: Figure 3

Description

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

  Conventionally, there are various wearable electronic devices having a non-contact data communication function (for example, Patent Document 1). This patent document 1 is a wristwatch that is worn on a user's arm and includes an antenna that is a non-contact data communication unit therein. With such a technique, for example, the read / write operation in a gate device installed at a gate position (such as a ticket gate) to be passed when boarding a train or a lift is improved.

  By the way, in recent years, there is a wearable electronic device such as a wristwatch that receives a satellite signal in GPS (Global Positioning System) and acquires a current position (for example, Patent Document 2). This patent document 2 relates to a GPS antenna used for an arm-mounted electronic device. There is a loop-shaped antenna with a dielectric formed of a non-conductive member inside the wristwatch, and by using this dielectric, the wavelength is shortened and the antenna perimeter is shortened. It is described that a single-wavelength loop antenna is accommodated with respect to the wavelength of.

JP 2003-050983 A JP 2011-097431 A

  However, in the technique described in Patent Document 2, an antenna covered with a dielectric is arranged along the periphery of the dial. For this reason, the bezel part provided on the outer periphery of the antenna part is enlarged, and there is a problem in that it is difficult to develop a watch model due to restrictions on the watch design.

  The present invention has been made in view of the above-described circumstances. For example, even when used for receiving satellite signals in GPS, the antenna body reduces the constraints imposed on the watch design while maintaining reception performance. However, it is an object of the present invention to provide an electronic timepiece with a built-in antenna that can improve the degree of freedom of model development.

  In order to solve the above-described problems, an electronic timepiece with built-in antenna according to the present invention includes a cylindrical exterior case at least partially formed of a non-conductive member, and a time display for displaying the time inside the exterior case. A driving body that drives the time display unit inside the outer case, an annular dielectric body that is disposed around the driving body inside the outer case, and an annular antenna that is in contact with the dielectric body And an antenna body that receives radio waves from a position information satellite.

In this electronic watch with built-in antenna, the antenna body that functions as a loop antenna is placed around the drive body, so the space inside the outer case can be used effectively, and a small watch with a small diameter is realized. it can. Further, by utilizing the wavelength shortening by the dielectric, the antenna body can be miniaturized, and the one-wavelength loop antenna can be housed in a small watch having a small diameter.
Here, the “antenna element” has a function of converting electromagnetic waves into current. The “annular shape” includes a circular shape or a substantially quadrangular shape, and includes an open ring shape (for example, C type) that is partially open, and a closed ring shape (for example, O type) that is entirely closed. For example, when the antenna element is a C-shaped loop antenna, a pair of feeding points serving as a start point and an end point of the loop antenna are located with a C-shaped cutout portion interposed therebetween. Therefore, by setting the peripheral length from the start point to the end point of the loop antenna to about one wavelength, it is possible to maintain the reception performance equivalent to the case where two half-wave dipole antennas are placed in parallel with the feeding point in between. .
The antenna body may have a plurality of antenna elements. For example, a C-shaped antenna element and an O-shaped antenna element may be provided. When two antenna elements are provided on the antenna body, the two antenna elements are preferably provided so as to be electromagnetically coupled to each other. In this case, the shape of one antenna element (for example, an O-shaped antenna element) is determined so as to resonate with a radio wave from a position information satellite, whereby the shape of the other antenna element (for example, a C-shaped antenna element) is determined. Therefore, the impedance between the antenna body and a circuit electrically connected to the antenna body (the other antenna element) can be easily matched.

  As described above, according to the present invention, for example, even when it is used for receiving satellite signals in GPS, while maintaining the reception performance, the constraints imposed on the watch design by the antenna body are reduced, and the degree of freedom of model development is reduced. It is possible to provide an electronic timepiece with a built-in antenna capable of improving the frequency.

  As the “non-conductive member”, materials other than metal, such as ceramics and plastics, can be used. Further, the “time display portion” includes a clock dial, and the time display on the dial includes a display by hands and a digital display such as liquid crystal. Examples of the pointer include an hour hand, a minute hand, and a second hand. The term “in contact with the dielectric” includes not only contact with the surface of the dielectric but also a case where the antenna element is embedded in the dielectric by so-called insert molding.

  This antenna built-in electronic timepiece has a cover glass that closes one of the two openings of the outer case, and an opening on the opposite side to the display direction of the time display unit, of the two openings of the outer case. A metal back cover for closing and a circuit board on which a wireless communication circuit accommodated in the exterior case for wireless communication is arranged are further provided, and the antenna body is arranged on the cover glass side with respect to the circuit board. Preferably, the antenna body is disposed on the cover glass side of the circuit board, and the wireless communication circuit is disposed on the back cover side of the circuit board. In this case, a circuit board can be interposed between the radio communication circuit such as a GPS module and the antenna body, and in-band (in-band of received signal) noise such as a clock signal generated from the radio communication circuit is generated by the antenna. It can reduce adverse effects on the body. This can reduce the deterioration of the sensitivity of the antenna body.

In each of the above-mentioned electronic timepieces with built-in antennas, the antenna body may be formed with an insertion portion extending from the outside of the antenna body to the driving body for insertion of the operation element of the electronic timepiece with built-in antenna. preferable. In this case, the operation element such as the crown of the crown or the operation button can be reached from the outside of the antenna body to the driving body in the antenna body through the insertion portion, and the antenna body and the operation element interfere with each other. Can be avoided, and the degree of freedom of the arrangement position of the antenna body can be increased.
Here, as the insertion portion, in addition to a hole penetrating in the radial direction from the side portion of the antenna body 40, a groove or a notch penetrating the antenna body in the radial direction may be used as long as the operation element can be inserted.

  Each antenna built-in type electronic timepiece is preferably provided so that the antenna element is in contact with the cover glass side of the dielectric. In this case, the radiation in the normal direction on the watch surface increases due to reflection by the metal back cover, and extremely high reception performance is obtained. At this time, since the antenna body is located on the cover glass side of the dielectric, the distance from the metal back cover can be appropriately secured and the reception sensitivity to the radio wave from the cover glass side should be improved. Can do.

  Each antenna built-in type electronic timepiece further includes a solar panel for photovoltaic power generation, and a part or all of the antenna body on the cover glass side is disposed on the cover glass side than the solar panel. Is preferred. Generally, there is an aluminum electrode with a thickness of several μm on the lower surface of the solar panel, and the reception performance deteriorates due to the influence. Therefore, part or all of the antenna body cover glass side is placed closer to the cover glass side than the solar panel. The reception performance can be maintained by positioning.

1 is an overall view of a GPS system including an antenna built-in electronic timepiece 100 (electronic timepiece 100) according to a first 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. 2 is a block diagram showing a circuit configuration of the electronic timepiece 100. FIG. 6 is a diagram showing a radiation pattern in the ZY plane of the antenna body 40 of the electronic timepiece 100. FIG. It is a partial cross section figure of the electronic timepiece 200 (electronic timepiece 200) with a built-in antenna which concerns on 2nd Embodiment of this invention. It is a partial cross section figure of the electronic timepiece 300 (electronic timepiece 300) with a built-in antenna which concerns on 3rd Embodiment of this invention. It is a perspective view of the antenna body 43 which concerns on the example of a change of this invention. It is a perspective view of the antenna body 44 which concerns on the example of a change of this invention. It is a perspective view of the antenna body 45 which concerns on the example of a change of this invention.

  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.

[First Embodiment]
FIG. 1 is an overall view of a GPS system including an antenna built-in electronic timepiece 100 (hereinafter referred to as “electronic timepiece 100”) according to a first embodiment of the present invention. The electronic timepiece 100 is a wristwatch that receives radio waves (radio signals) from the GPS satellite 20 and corrects the internal time, and is a surface opposite to a surface (hereinafter referred to as “back surface”) that contacts the arm (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.
Hereinafter, the GPS satellite 20 will be described as an example of the position information satellite included in the GPS system, but this is merely an example. The GPS system is a satellite signal that includes time information from other global navigation satellite systems (GNSS) such as Galileo (EU), GLONASS (Russia), Hokuto (China), and geostationary and quasi-zenith satellites such as SBAS. As long as it is equipped with a position information satellite for transmitting. 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). In order to identify which GPS satellite 20 the satellite signal is transmitted from, 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. 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 x, y, and z 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 a cylindrical outer case 80 formed of a nonconductive member such as ceramic or plastic. As for its external appearance, an annular bezel 81 formed of a non-conductive member such as ceramic or plastic is fitted to the outer peripheral edge of the outer case 80. On the inner peripheral side of the bezel 81, a disk-shaped dial plate 11 is disposed as a time display portion via an annular dial ring 83 formed of plastic. On the dial plate 11, pointers 13 (13a to 13c) for displaying time, date, and the like are arranged. A liquid crystal display panel 14 is disposed on the back side of the dial 11. The opening on the surface side of the exterior case 80 is closed with a cover glass 84 via a bezel 81. Through the cover glass 84, the internal dial 11, the hands 13 (13a to 13c), and the liquid crystal display panel 14 are visible. In FIG. 2, the characters “TYO” displayed on the liquid crystal display panel 14 mean “Tokyo” and display the time of Japan in the world time function.

The dial ring 83 is a plastic annular member that contacts the inner peripheral surface of the bezel 81. Below the dial ring 83, an antenna body 40 having a so-called C-shaped antenna element in which a part of the annular shape is cut is housed.
The antenna body 40 is configured by arranging a loop antenna, which is cut out of a ring shape, in a ring shape along the outer edge of the dial 11 that is a time display portion. The antenna body 40 of the present embodiment is disposed around the driving body 30 inside the outer case 80. Specifically, the driving body 30 is housed inside the ground plane 38, and an annular antenna body 40 is fitted on the outer periphery of the ground plane 38. Two feeding points 40 a and 40 b for the antenna body 40 are also arranged on the outer periphery of the ground plane 38. The feeding points 40 a and 40 b are electrodes that are located at the start point and the end point of the antenna body 40 and feed the antenna body 40.

  Further, the electronic timepiece 100 manually receives the satellite signal from at least one GPS satellite 20 and corrects the internal time information by manually operating the crown 16 and the operation buttons 17 and 18 shown in FIGS. A mode (time information acquisition mode) and 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 internal time information are configured. 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 FIGS. 3 and 4, an annular bezel 81 made of ceramic is fitted on the surface side of a cylindrical outer case 80 made of ceramic. An annular dial ring 83 made of plastic is attached along the inner periphery of the bezel 81. Of the two openings of the exterior case 80, the opening on the front side is closed with a cover glass 84 via an annular bezel 81, and the opening on the back side is closed with a back cover 85 formed of metal. ing. The metal back cover 85 and the outer case 80 are fitted via a packing.

  The electronic timepiece 100 also includes a secondary battery 27 such as a lithium ion battery inside the outer case 80. The secondary battery 27 is charged with electric power generated by a solar panel 87 described later. That is, solar charging is performed. The electronic timepiece 100 includes a light-transmitting dial plate 11, a pointer shaft 12 penetrating the dial plate 11, and a plurality of hands 13 (circling around the pointer shaft 12 to indicate the current time. A second hand 13a, a minute hand 13b, and an hour hand 13c), and a driving body 30 that rotates the pointer shaft 12 to drive the plurality of hands 13. The pointer shaft 12 extends in the front and back direction along the central axis of the exterior case 80.

  The dial plate 11 is a circular plate member that constitutes a time display portion that displays the time inside the outer case 80, and is formed of a light-transmitting material such as plastic. The dial plate 11 is disposed inside the dial ring 83 with the hands 13 (13 a to 13 c) sandwiched between the dial 11 and the cover glass 84. A hole through which the pointer shaft 12 passes is formed at the center of the dial 11 and an opening for allowing the liquid crystal display panel 14 to be visually recognized is formed.

  The drive body 30 is attached to the main plate 38, and has a step motor and a gear train. The step motor drives the plurality of hands 13 by rotating the hands 13 through the wheel train. Specifically, the hour hand 13c makes a full turn in 12 hours, the minute hand 13b in 60 minutes, and the second hand 13a in 60 seconds. Further, the ground plate 38 to which the driving body 30 is attached is disposed so as to sandwich the dial plate 11 between the pointer 13.

  The electronic timepiece 100 also includes a solar panel 87 that performs photovoltaic power generation inside the exterior case 80. 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 dial 11 and the driving body 30 and extends along the cross section of the pointer shaft 12. The solar panel 87 is disposed inside the dial ring 83 in the extending direction. In addition, a hole through which the pointer shaft 12 passes is formed at the center of the solar panel 87, and an opening for allowing the liquid crystal display panel 14 to be visually recognized is formed.

  The electronic timepiece 100 includes a circuit board 25, a balun 10 mounted on the circuit board 25, a GPS receiving unit (wireless receiving unit) 26, and a control unit 70 inside the exterior case 80. The balun 10 is a balanced-unbalanced conversion element, and converts a balanced signal from the antenna body 40 that operates by balanced feeding into an unbalanced signal that can be handled by the GPS receiver 26.

  The electronic timepiece 100 includes an antenna body 40 having an antenna element having a shape in which an annular part is cut out. The antenna body 40 is formed by using a ring-shaped dielectric 40d as a base material and forming a metal antenna pattern 40c thereon by plating or silver paste printing. The antenna pattern 40c functions as an antenna element that converts electromagnetic waves into current. The antenna pattern 40c is formed on the cover glass 84 side of the dielectric 40d, and is disposed on the cover glass 84 side with respect to the circuit board 25. The antenna pattern 40c is covered with the dial ring 83 and the bezel 81. As the dielectric, a dielectric material that can be used at high frequencies, such as titanium oxide, can be mixed with the resin and molded, and this makes it possible to further reduce the size of the antenna in combination with shortening the wavelength of the dielectric.

For example, in the case of GPS reception, since it is 1.575 GHz, one wavelength is 19 cm. In order to embed a normal antenna in a bezel portion of a wristwatch, it does not fit as it is, and the wavelength needs to be shortened. In this embodiment, since the wavelength shortening by the dielectric is (εr) ^1/2 , in this embodiment, about εr = 5 to 10 is used as the dielectric 40d. Thereby, even if it is an antenna for GPS reception, a 1 wavelength loop antenna can be accommodated in a wristwatch, and size reduction of an antenna can be achieved.

  The antenna body 40 is fed through two feeding points 40a and 40b located at both ends of the antenna pattern portion 40c, that is, at the C-shaped cutout portion. The feed points 40a and 40b are connected to an antenna connection terminal (not shown) disposed on the lower surface of the antenna. The antenna connection terminal is provided on the circuit board 25 and connects the circuit board 25 and the antenna body 40 by making contact with feed points 40 a and 40 b that have wrapped around to the lower surface of the antenna body 40.

  In the present embodiment, power feeding to the antenna body 40 is balanced power feeding from the balun 10 through two feeding points 40a and 40b. Specifically, positive and negative feeding points 40a and 40b are provided at both ends of the antenna pattern portion 40c, and these two feeding points 40a and 40b are connected to the antenna connection terminal. Balanced feeding is performed via these antenna connection terminals, and the GPS receiver 26 receives a radio signal using the antenna body 40. Note that since the antenna body 40 is a one-wavelength loop antenna, it has a self-balancing action with respect to power feeding, and can be fed directly without the balun 10.

  Further, an insertion portion 40 e extending from the outside of the antenna body 40 to the driving body 30 in the antenna body 40 is formed on the side portion of the antenna body 40. The insertion portion 40e is a hole for allowing an operator such as a crown winding stem or an operation button to reach the driver 30 in the antenna body 40 from the outside of the antenna body 40 through the insertion portion 40e. It is provided in the position to do. In FIG. 4, as the insertion portion 40e, a hole that penetrates the dielectric 40d in the radial direction from the side portion is illustrated. However, as the insertion portion 40e, if the operator can be inserted, the antenna body 40 is moved in the radial direction. It may be a through groove or notch.

  FIG. 5 is a block diagram showing a circuit configuration of the electronic timepiece 100. As shown in FIG. 5, 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. 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. Instead of the regulator 35, for example, a regulator 35-1 that supplies driving power to the RF unit 50 (details will be described later) and a regulator 35-2 that supplies driving power to the baseband unit 60 (details will be described later). Both of them may be provided separately. The regulator 35-1 may be provided inside the RF unit 50.

  The electronic timepiece 100 includes an antenna body 40, a balun 10, 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 set to the time information acquisition mode or the position information acquisition mode, 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 RTC 64 provided in the baseband unit 60 operates only during reception of the satellite information of the GPS satellite 20, and holds GPS time information.

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 via the drive circuit 74.

  The storage unit 71 stores internal time information. The RTC 72 operates constantly, measures the internal time for time display, and generates internal time information. The internal time information is time information measured inside the electronic timepiece 100 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.

As described above, in the electronic timepiece 100, the antenna body 40 is a C-shaped loop antenna as a whole, and the pair of feeding points 40a and 40b that are the start and end points of the loop antenna sandwich the C-shaped notch portion. Will be located at. For this reason, by setting the peripheral length from both ends of the antenna body 40, that is, the start point to the end point of the loop antenna, to about one wavelength shortened by the dielectric 40d, two half-wavelength dipole antennas are connected to the feed point 40a and It is possible to maintain the reception performance equivalent to the case of placing them in parallel across 40b.
Further, by arranging the antenna body around the driving body 30, the space in the exterior case can be used effectively, and a small timepiece having a small diameter can be realized. In other words, the electronic timepiece 100 is a loop antenna having a donut-shaped (O-type) shape when the antenna body 40 is viewed in plan, and therefore the space inside the antenna body 40 can be effectively utilized. More specifically, the driving body 30 and the like can be arranged in the space inside the antenna body 40. Therefore, it is possible to reduce the size of the electronic timepiece 100 as compared to a case where the antenna body 40 is not a loop antenna (for example, a patch antenna).
As described above, in the present embodiment, since the antenna body 40 is a loop antenna, the restrictions imposed on the design of the electronic timepiece 100 by the antenna body 40 are reduced compared to the case where the antenna body is a patch antenna, etc. There is an advantage that the degree of freedom of model development of the watch 100 can be improved.

  FIG. 6 is an explanatory diagram of the radiation pattern of the antenna body 40. The Z point when the center point of the antenna body 40 is the origin, the horizontal plane including the watch surface is the XY plane, and the normal direction of the watch surface is the Z axis. The radiation pattern on the -Y plane is shown.

In FIG. 6, the antenna radiation patterns are compared with and without the metal back cover. As shown in FIG. 6, in the YZ plane, if there is a metal back cover, the radiation in the dial direction (Z-axis direction) increases due to reflection.
If the case is made of metal and is too close to the antenna, the antenna characteristics are deteriorated. However, in the present embodiment, the exterior case 80 is a non-conductive member, so there is no such influence. Further, the back cover 85 is separated by the ground plane 38, the driving body 30, and the like, and has an appropriate distance from the antenna body 40. Therefore, the back cover 85 functions as a reflector that enhances the antenna characteristics in the dial direction (Z-axis direction).
The satellite signal from the GPS satellite 20 comes from the sky, unlike the mobile radio from which the signal comes from all directions. Therefore, in order for the electronic timepiece 100 to obtain good antenna characteristics, the zenith direction characteristics in the radiation pattern are important. On the other hand, when the electronic timepiece 100 is worn on the user's arm, the dial direction (Z axis) and the zenith direction are generally close to each other.
Therefore, the electronic timepiece 100 including the back cover 85 and having good antenna characteristics in the dial direction (Z-axis direction) is desirable when the watch is attached to the user's arm and the timepiece surface is facing the apex. It can be seen that antenna characteristics can be obtained.

In the electronic timepiece 100, the antenna can be reduced in size by utilizing the wavelength shortening by the dielectric 40d. That is, since the wavelength shortening by the dielectric becomes (εr) ^1/2 , in the present embodiment, εr = about 5 to 10 is used as the dielectric 40d. Thereby, even if it is an antenna for GPS reception, a 1 wavelength loop antenna can be accommodated in a wristwatch, and size reduction of an antenna can be achieved. Further, since the antenna body 40 does not require a ground plate, there is an advantage that it can be applied to a small device that cannot be provided with a large size ground plate. In the present embodiment, the antenna body 40 has the antenna pattern 40c formed on the surface of the ring-shaped dielectric 40d by plating, silver paste printing, or the like. When the antenna pattern 40c is formed on the surface, the processing is easy and the frequency adjustment is also easy.

  Furthermore, since the antenna body 40 is balancedly fed through the feeding points 40a and 40b, the feeding points 40a and 40b can form a balanced antenna pattern, and reception performance can be improved. Further, since the antenna body 40 is disposed on the cover glass 84 side with respect to the circuit board 25, the circuit board 25 can be interposed between the GPS receiver 26 such as a GPS module and the antenna body 40. Therefore, it is possible to reduce the in-band (in-band of the received signal) noise such as a clock signal generated from the GPS receiving unit 26 from adversely affecting the antenna body 40. Thereby, it can reduce that the sensitivity of the antenna body 40 deteriorates.

  Further, the antenna body 40 is formed with an insertion portion 40e extending from the outside of the antenna body 40 to the driving body 30 in the antenna body 40. For this reason, operators such as the crown of the crown and the operation buttons can be reached from the outside of the antenna body 40 to the driving body 30 in the antenna body 40 through the insertion portion 40e. Thereby, it can avoid that the antenna body 40 and an operation element interfere, and the freedom degree of the arrangement position of the antenna body 40 can be raised.

  As described above, according to the present invention, for example, even when it is used for receiving satellite signals in GPS, while maintaining the reception performance, the constraints imposed on the watch design by the antenna body are reduced, and the degree of freedom of model development is reduced. It is possible to provide an electronic timepiece with a built-in antenna capable of improving the frequency.

[Second Embodiment]
FIG. 7 is a partial sectional view of an antenna built-in type electronic timepiece 200 (electronic timepiece 200) according to the second embodiment of the present invention. The electronic timepiece 200 is different from the electronic timepiece 100 in that an antenna body 41 is provided instead of the antenna body 40. The antenna body 41 is different from the antenna body 40 in that the surface on the cover glass 84 side is arranged closer to the cover glass 84 than the surface of the solar panel 87.

  Specifically, as shown in FIG. 7, in this embodiment, the antenna body 41 is arranged around the cover glass 84, and a part or all of the antenna body 41 on the cover glass 84 side is more than the solar panel 87. Arranged on the side. More specifically, the electronic timepiece 200 includes an antenna pattern portion 41c antenna body 41 having a shape in which an annular part is cut out. The antenna body 41 is formed by using a ring-shaped dielectric as a base material and forming a metal antenna pattern on the base body by plating or silver paste printing. The antenna pattern is formed on the dielectric cover glass 84 side, disposed on the cover glass 84 side with respect to the circuit board 25, and further disposed on the cover glass 84 side with respect to the solar panel 87.

  The antenna body 41 is fed through two feeding points 41a and 41b located at both ends of the antenna pattern portion 41c, that is, at the C-shaped cutout portion. At the feeding points 41a and 41b, an antenna connection disposed on the lower surface of the antenna is provided. It is connected to pins 45A and 45B. The antenna connection pins 45A and 45B are pin-shaped connectors made of metal with a built-in spring. The antenna connection pins 45 </ b> A and 45 </ b> B project from the circuit board 25 and connect the circuit board 25 and the internal antenna body 41.

  In the present embodiment, the power supply to the antenna body 41 is balanced power supply from the balun 10 through the two power supply points 41a and 41b. Specifically, positive and negative feeding points 41a and 41b are provided at both ends of the antenna body 41, and these two feeding points 41a and 41b are connected to the antenna connection pins 45A and 45B. Balanced feeding is performed via these antenna connection pins 45A and 45B, and the GPS receiver 26 receives a radio signal using the antenna body 41. Note that since the antenna body 41 is a one-wavelength loop antenna, it has a self-balancing action with respect to power feeding, and can be fed directly without using the balun 10.

  As is clear from the above description, according to the electronic timepiece 200, the same effect as the electronic timepiece 100 can be obtained. Furthermore, a part or all of the antenna body 41 on the cover glass 84 side is arranged closer to the cover glass 84 than the solar panel. In general, an aluminum electrode having a thickness of several μm is provided on the lower surface of the solar panel, and the reception performance deteriorates due to the influence. However, the reception performance can be maintained by positioning a part or all of the antenna body 41 on the cover glass 84 side closer to the cover glass 84 than the solar panel.

[Third Embodiment]
FIG. 8 is a partial cross-sectional view of an electronic timepiece 300 with built-in antenna (electronic timepiece 300) according to the third embodiment of the present invention. The electronic timepiece 300 is different from the electronic timepiece 100 in that an antenna body 42 is provided instead of the antenna body 40. The antenna body 42 has an annular dielectric body 42d and is different from the antenna body 40 in that the antenna pattern portion 42c is embedded in the dielectric body 42d. The antenna pattern portion 42c functions as an antenna element that converts electromagnetic waves into current. In the present embodiment, the solar panel 87 is omitted, and the battery 27a is a primary battery such as a lithium coin battery. Further, the arrangement of the battery 27 and the GPS receiver 26 is reversed, and the GPS receiver 26 is further separated from the sensitive antenna feeding point.

  Specifically, as shown in FIG. 8, the present embodiment includes a donut-shaped (O-type) dielectric 42 d extending in the circumferential direction around the drive body 30. An antenna body 42 is configured by embedding a metal antenna pattern portion 42c in the dielectric 42d. The cross-sectional shape of the dielectric 42d is substantially square. The dielectric 42d is a dielectric such as a dielectric ceramic, but may be formed by insert molding using a plastic mixed with a dielectric. In the present embodiment, the doughnut-shaped dielectric 42d is provided at positions where the feeding points 42a and 42b are close to each other, and the antenna pattern portion 42c inside the dielectric 42d has a part of an annular shape. It has a cutout so-called C shape.

In the third embodiment, the exterior case 80 is made of metal, and the exterior case 80 and the metal back cover 85 are made to function as a ground plate. That is, one feeding point 42 a or 42 b of the antenna body 42 is connected to the metal outer case 80 or the back cover 85 via the conduction spring 39. It is desirable that a plurality of conductive springs 39 are provided at positions that are symmetrical with each other in plan view. By providing a plurality of conductive springs 39 at symmetrical positions, it is possible to efficiently receive circularly polarized satellite signals.
The other feeding point 42a or 42b is fed through an antenna connection terminal (not shown). At this time, since the antenna body 42 is a one-wavelength loop antenna, it has a self-balancing action with respect to power feeding, and can be fed directly without the balun 10.

  As is clear from the above description, according to the electronic timepiece 300, the same effect as the electronic timepiece 100 can be obtained. As a further effect, combined with the wavelength shortening effect of the dielectric 42d, the perimeter of the antenna can be shortened, whereby the entire antenna can be further downsized. Further, by contacting with the dielectric 42d, the metal antenna pattern portion 42c can be fixed so as not to move, and the stability of the apparatus can be improved. Further, by making the cross section of the antenna body 42 substantially square, there is no wasted space, the space in the watch can be used effectively, and it can contribute to downsizing.

  In the present embodiment, the exterior case 80 functions as a ground plate via the conduction spring 39 through the feeding points 42a or 42b provided at positions close to each other in the loop antenna, and thus one antenna connection pin 45 is provided. Therefore, the structure is simplified, the cost can be reduced, and the degree of freedom of the position where the feeding point is arranged can be increased. Further, the size reduction can be promoted by omitting the balun 10 due to the self-balancing action with respect to the feeding of the antenna body 42.

[Example of change]
The description of each embodiment described above is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made according to the design or the like as long as the technical idea according to the present invention is not deviated. Below, the example of a change of the antenna bodies 40, 41, and 42 mentioned above is shown. FIG. 9 is a perspective view of an antenna body 43 according to a first modification of the present invention, and FIG. 10 is a perspective view of an antenna body 44 according to a second modification of the present invention. FIG. 11 is a perspective view of an antenna body 45 according to a third modification of the present invention.

  For example, as shown in FIG. 9, the antenna bodies 40, 41 and 42 described above may be changed to an antenna body 43. This antenna body 43 is different from the antenna bodies 40, 41, and 42 in that an antenna pattern portion 43c is provided on the outer peripheral side surface of the dielectric 43d.

  Specifically, the antenna body 43 includes a donut-shaped (O-type) dielectric body 43d extending in the circumferential direction. A metal antenna pattern portion 43c is formed on the outer peripheral side surface of the dielectric 43d by plating or silver paste printing. The antenna pattern portion 43c formed on the outer peripheral side surface of the dielectric 43d has a so-called C shape in which a part of the annular shape is cut out. Also in this modified example, feed points 43a and 43b are provided on the outer peripheral side of the doughnut-shaped dielectric 43d at positions close to each other. The dielectric 43d is provided with an insertion portion 43e through which the operator is inserted into the drive body 30 at a portion that interferes with the winding stem. In this modification, the insertion portion 43e has a groove shape provided at a position that does not contact the antenna pattern portion 43c formed on the outer peripheral side surface.

  In such an antenna body 43, since the antenna pattern portion 43c is provided on the outer peripheral side surface of the dielectric ring, the thickness of the dielectric can be reduced, and the wristwatch can be downsized. In this case, since the volume of the dielectric 43d is small, the dielectric 43d is formed of a material having a large dielectric constant in order to shorten the wavelength sufficiently.

  Further, for example, as shown in FIG. 10, the antenna bodies 40, 41 and 42 described above may be changed to an antenna body 44. This antenna body 44 is different from the antenna bodies 40, 41, 42 in that it has a predetermined distance between the feeding point and the cutout portion.

Specifically, the antenna body 44 includes a donut-shaped (O-type) dielectric body 44d extending in the circumferential direction. On the upper surface of the dielectric 44d, a metal antenna pattern portion 44c is formed by plating, silver paste printing, or the like. The antenna pattern portion 44c inside the dielectric 44d has a so-called C shape in which an annular part is cut out.
In this modified example, one feeding point 44a is located at one point on the circumference of the doughnut-shaped dielectric 44d, and an operator is attached to the driver 30 at a portion that interferes with the winding stem. An insertion portion 44e is provided to be inserted into.

  In such an antenna body 44, it is possible to receive circularly polarized waves by appropriately setting the distance between the feeding point 44a and the cutout portion, and it is possible to improve the reception performance of GPS reception. The antenna pattern portions 43c and 44c described above function as antenna elements that convert electromagnetic waves into current.

Further, for example, as shown in FIG. 11, the antenna bodies 40, 41 and 42 described above may be changed to an antenna body 45. The antenna body 45 is different from the antenna body 40 in that it includes a fed antenna pattern portion 45b and a parasitic antenna pattern portion 45c instead of the antenna pattern 40c.
Specifically, the antenna body 45 includes a doughnut-shaped (O-type) dielectric body 45d extending in the circumferential direction, and a metal antenna pattern is formed on the upper surface of the dielectric body 45d by plating, silver paste printing, or the like. The portions 45b and 45c are formed. The antenna pattern portion 45c has an O shape, and the antenna pattern portion 45b is formed inside thereof. These two antenna pattern portions 45b and 45c are electromagnetically coupled to each other. The antenna pattern portion 45c has an antenna length that resonates with radio waves (satellite signals) from the position information satellite. These two antenna pattern portions 45b and 45c function as antenna elements that convert electromagnetic waves into current.
One feeding point 45a is located at one point on the circumference of the dielectric 45d having a donut shape, and an insertion portion 45e for inserting the operating element into the driving body 30 at a portion interfering with the winding stem. Is provided.
In such an antenna body 45, it is possible to easily match the impedance with a circuit electrically connected to the antenna body 45 by appropriately setting the length of the antenna pattern portion 45b.

100, 200, 300 ... Electronic clock with built-in antenna, 40, 41, 42, 43, 44, 45 ... Antenna body, 40a, 40b, 41a, 41b, 42a, 42b, 43a, 43b, 44a, 45a ... Feeding point, 40c, 42c, 43c, 44c, 45b, 45c ... antenna pattern portion, 40d, 41d, 42d, 43d, 44d, 45d ... dielectric, 40e, 43e, 44e, 45e ... insertion part, 45A, 45B ... antenna connection pin, DESCRIPTION OF SYMBOLS 11 ... Dial, 12 ... Pointer shaft, 13 (13a, 13b, 13c) ... Pointer, 26 ... GPS receiver, 30 ... Driver, 80 ... Exterior case, 81 ... Bezel, 82 ... Storage space, 84 ... Cover glass , 85 ... Back cover, 87 ... Solar panel.

In order to solve the above-described problems, an electronic timepiece with built-in antenna according to the present invention includes a cylindrical exterior case at least partially formed of a non-conductive member, and a time display for displaying the time inside the exterior case. and parts, inside the front Kigaiso case, the a direction in which time display unit displaying the time of the time display unit than disposed opposite an annular dielectric ring in contact with said dielectric And an antenna body for receiving radio waves from a position information satellite.

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. A back cover that closes the other of the two openings, a time display unit that displays time inside the exterior case, and between the time display unit and the back cover inside the exterior case. The antenna device includes an annular dielectric body, an annular antenna element in contact with the dielectric body, and an antenna body that receives radio waves from a position information satellite.
In this electronic timepiece with built-in antenna, since the antenna body that functions as a loop antenna is disposed between the time display unit and the back cover , the space in the outer case can be effectively utilized, A small and small watch can be realized. Further, by utilizing the wavelength shortening by the dielectric, the antenna body can be miniaturized, and the one-wavelength loop antenna can be housed in a small watch having a small diameter.
Here, the “antenna element” has a function of converting electromagnetic waves into current. The “annular shape” includes a circular shape or a substantially quadrangular shape, and includes an open ring shape (for example, C type) that is partially open, and a closed ring shape (for example, O type) that is entirely closed. For example, when the antenna element is a C-shaped loop antenna, a pair of feeding points serving as a start point and an end point of the loop antenna are located with a C-shaped cutout portion interposed therebetween. Therefore, by setting the peripheral length from the start point to the end point of the loop antenna to about one wavelength, it is possible to maintain the reception performance equivalent to the case where two half-wave dipole antennas are placed in parallel with the feeding point in between. .
The antenna body may have a plurality of antenna elements. For example, a C-shaped antenna element and an O-shaped antenna element may be provided. When two antenna elements are provided on the antenna body, the two antenna elements are preferably provided so as to be electromagnetically coupled to each other. In this case, the shape of one antenna element (for example, an O-shaped antenna element) is determined so as to resonate with a radio wave from a position information satellite, whereby the shape of the other antenna element (for example, a C-shaped antenna element) is determined. Therefore, the impedance between the antenna body and a circuit electrically connected to the antenna body (the other antenna element) can be easily matched.

The “ time display portion” includes a timepiece dial, and the time display on the dial includes a display using hands and a digital display such as a liquid crystal display. Examples of the pointer include an hour hand, a minute hand, and a second hand. The term “in contact with the dielectric” includes not only contact with the surface of the dielectric but also a case where the antenna element is embedded in the dielectric by so-called insert molding.

In each of the electronic timepieces with built-in antennas, the antenna body is formed with an insertion portion extending from the outside of the antenna body to the inside of the antenna body for insertion of the operation element of the electronic timepiece with built-in antenna. It is preferable. In this case, the operator such as the crown of the crown or the operation button can be made to reach the inside of the antenna body from the outside of the antenna body through the insertion portion, and the antenna body and the operator can be prevented from interfering with each other. This can be avoided, and the degree of freedom of the arrangement position of the antenna body can be increased.
Here, as the insertion portion, in addition to a hole penetrating in the radial direction from the side portion of the antenna body 40, a groove or a notch penetrating the antenna body in the radial direction may be used as long as the operation element can be inserted.

Claims (12)

A cylindrical outer case at least partially formed of a non-conductive member;
A time display unit for displaying the time inside the outer case;
A driving body for driving the time display unit inside the outer case;
An antenna body that is disposed around the drive body inside the outer case, has an annular dielectric body, and an annular antenna element in contact with the dielectric body, and receives radio waves from a position information satellite; An electronic timepiece with a built-in antenna. The antenna built-in electronic timepiece is
A cover glass that closes one of the two openings of the outer case; and
Of the two openings of the exterior case, a metal back cover that closes the opening opposite to the display direction of the time display unit,
A circuit board on which a wireless communication circuit that is housed in the exterior case and performs wireless communication is disposed;
2. The antenna built-in type according to claim 1, wherein the antenna body is disposed on the cover glass side of the circuit board, and the wireless communication circuit is disposed on the back cover side of the circuit board. Electronic clock.   The said antenna body is provided with the insertion part from the exterior of the said antenna body to the said drive body for insertion of the operation element of the said electronic timepiece with a built-in antenna, The said Claim 1 or 2 characterized by the above-mentioned. Electronic watch with built-in antenna. The antenna built-in electronic timepiece according to claim 2 or 3, wherein the antenna element is provided so as to be in contact with the cover glass side of the dielectric. The antenna built-in electronic timepiece further includes a solar panel for photovoltaic power generation,
5. The built-in antenna according to claim 2, wherein a part or all of the antenna body on the cover glass side is disposed closer to the cover glass than the solar panel. Electronic clock. 6. The electronic timepiece with built-in antenna according to claim 1, wherein the dielectric has a relative dielectric constant of 5 or more. 7. 7. The antenna built-in electronic timepiece according to claim 1, wherein a relative dielectric constant of the dielectric is 10 or less. The electronic timepiece with a built-in antenna according to claim 3, wherein the insertion portion is a hole. The antenna built-in electronic timepiece according to any one of claims 1 to 8, wherein the antenna element is formed by plating or printing. The antenna built-in electronic timepiece according to any one of claims 1 to 8, wherein the antenna element is embedded in the dielectric. 11. The antenna element according to claim 1, wherein the antenna element has a C shape and has a pair of feeding points positioned with a notch portion of the C shape interposed therebetween. Electronic watch with built-in antenna. The electronic timepiece with built-in antenna according to any one of claims 1 to 11, wherein the electronic timepiece with built-in antenna has a balun that converts a signal from the antenna body.

Images