JP2014062851A - Antenna built-in type electronic timepiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna built-in type electronic timepiece capable of securing excellent reception performance of an antenna by making a gap G1 between an antenna element 40 and a dial ring 83 constant.SOLUTION: An antenna built-in type electronic timepiece includes: a bottom plate 38 housed in the external case 80; an annular antenna element 40 housed in the external case 80; an annular dial ring 83 arranged on the upper side of the antenna element 40; an antenna protruding part 112 in which the antenna element 40 is positioned against the bottom plate 38 in the plane direction and the rotation direction; and a dial ring protruding part 115 in which the dial ring 83 is positioned against the ground plate 38 in the plane direction and the rotation direction. The antenna protruding part 112 and the dial ring protruding part 115 are formed on the bottom plate 38.

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 display accurate time. Such an electronic timepiece includes a ring-shaped antenna for receiving radio waves from a position information satellite (see Patent Document 1).

  In an electronic timepiece having such a ring-shaped antenna, the ring-shaped antenna is arranged around the time display portion (for example, a dial plate) of the electronic timepiece, and from the viewpoint of design, the antenna is connected to the dial ring from above. I try to cover it. This dial ring is usually formed of a plastic or the like which is a non-conductive material in consideration of good reception performance of the antenna.

JP 2011-21929 A

  However, the plastic material that is the material of the dial ring also has a small dielectric constant, so the resonance frequency of the antenna arranged in the vicinity of the dial ring is fluctuated, and the radio wave reception performance of the antenna is reduced. Will have an impact. For this reason, in an electronic timepiece with a built-in antenna, it is important to keep the distance between the antenna and the dial ring constant and to keep the influence of the dial ring constant in order to keep the radio wave reception performance of the antenna good.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and in an electronic timepiece with a built-in antenna, the positional relationship between the antenna and the dial ring is made constant to ensure good reception performance of the antenna. And

  In order to solve the above-mentioned problems, an electronic timepiece with built-in antenna according to the present invention includes a cylindrical outer case, a ground plate stored in the outer case, an annular antenna element stored in the outer case, An annular upper member disposed above the antenna element, an antenna engaging portion for positioning the antenna element with respect to the ground plane, and an upper member engaging portion for positioning the upper member with respect to the ground plane The antenna engaging portion and the upper member engaging portion are formed on the base plate.

According to the antenna built-in type electronic timepiece of the invention, the antenna engaging portion and the upper member engaging portion are formed on the ground plate which is the same member. The antenna element and the upper member are engaged with the antenna engaging portion and the upper member engaging portion, respectively. Therefore, according to the present invention, the antenna element and the upper member are engaged with each other by the antenna engaging portion and the upper member engaging portion arranged on the same plate, so that the antenna element and the upper member are Can be kept constant, the influence of the upper member on the antenna element can be made constant, and good reception performance of the antenna can be ensured. In the present invention, the “upper member” includes various members disposed on the upper side (glass surface side) of the antenna element. For example, in addition to a dial ring having an annular shape corresponding to the shape of the antenna element. Also included are parts such as dials.
More specifically, the antenna engagement portion positions the antenna element so as not to move in a plane direction and a rotation direction with respect to the ground plane, and the upper member engagement portion causes the upper member to move to the ground plane. It is preferable to position so as not to move in the plane direction and the rotation direction. Further, in the present invention, the “horizontal direction” means a two-dimensional direction in a plane parallel to the display surface of the time display unit or in a plane parallel to the radial direction of the cylindrical outer case, and “vertical direction”. The term “normal direction” (display direction) perpendicular to the display surface of the time display unit or a two-dimensional direction in a plane parallel to the direction orthogonal to the radial direction of the cylindrical outer case.

  The antenna engaging portion may include the antenna protruding portion that protrudes vertically from the ground plane, and the antenna element may be formed with an antenna recess that engages with the antenna protruding portion. . The upper member engaging portion includes the upper member side protruding portion that is formed to protrude in a vertical direction from the base plate, and the upper member includes a higher member side recessed portion that engages with the upper member side protruding portion. May be formed. In this way, the antenna element and the upper member can be easily positioned in the plane direction and the rotation direction with respect to the ground plane.

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. 2 is a block diagram showing a circuit configuration of the electronic timepiece 100. FIG. FIG. 4 is a partially broken cross-sectional view showing an engagement state between an antenna element and a dial ring of the electronic timepiece 100 and a protruding portion formed on a ground plate. 4 is a partially broken cross-sectional view showing a positioning portion in the vertical direction of an antenna element in the electronic timepiece 100. FIG. 4 is a partially broken cross-sectional view showing a positioning portion in the vertical direction of an antenna element in the electronic timepiece 100. 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 a schematic diagram showing an entire 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 (wireless 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.

  Hereinafter, the GPS system will be described as an example of a satellite positioning system, but the GPS system is an example of a satellite positioning system. The present invention provides a satellite signal including time information such as 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. Other satellite positioning systems can be used that provide a transmitting location information satellite. 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, the C / A code superimposed on the satellite signal can be detected by correlating the actually received satellite signal with each known C / A code pattern.

  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 has a cylindrical case body 81 formed of a metal or other conductive material, and a glass edge 82 formed of ceramic or other non-conductive material. 81.

  An annular dial ring 83 made of plastic or other non-conductive material is disposed inside the glass edge 82, and a disk-shaped dial plate 11 is disposed inside the dial ring 83. The dial ring 83 is an upper member that is disposed above the antenna element 40 and covers the antenna element 40. For example, the dial ring 83 is provided with numerals 1 to 12 indicating the time every 30 degrees, and a dial plate. 11, for example, bar type indexes are provided every 30 degrees. The information shown on the dial ring 83 and the information shown on the dial plate 11 may be different from each other, and are not limited to the illustrated information.

  On the dial plate 11, hands 13 (13 a to 13 c) are arranged around the pointer shaft 12 to indicate the current time. Below, the dial plate 11 may be called a time display part.

  Although details will be described later, the exterior case 80 has two openings on the front surface side and the back surface side. The opening on the surface side of the exterior case 80 is closed with a cover glass 84 through a glass edge 82, and the dial plate 11 and the hands 13 (13 a to 13 c) are visible through the cover glass 84. It has become.

  The electronic timepiece 100 includes a crown 16 and operation buttons 17 and 18 as shown in FIGS. 1 and 2. A mode in which the electronic timepiece 100 receives a satellite signal from at least one GPS satellite 20 and corrects internal time information by manually operating the crown 16 and the operation buttons 17 and 18 (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 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, the exterior case 80 has a cylindrical case body 81 formed of metal or other conductive material, and a glass edge 82 formed of ceramic or other non-conductive material. The glass edge 82 is fitted to the case body 81. 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 front surface side of the exterior case 80 is closed with a disk-shaped cover glass 84, and the opening K2 on the back surface side is a back cover formed of a metal such as SUS (stainless steel) or Ti (titanium). It is blocked at 85. The back cover 85 and the case body 81 are fixed by, for example, screw grooves.

  An annular dial ring 83 made of a non-conductive material such as plastic is provided along the inner periphery of the glass edge 82 on the lower side (back side) of the cover glass 84. 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 the dial ring 83 and the inner periphery of the outer case 80. Specifically, the dial ring 83 is a mortar-shaped portion whose outer peripheral side is a horizontal ring-shaped portion that contacts the inner peripheral surface of the glass edge 82 and whose inner peripheral side is inclined inward. A donut-shaped storage space is defined by the ring-shaped portion and the mortar-shaped portion of the dial ring 83 and the inner periphery of the outer case 80. In this storage space, a ring-shaped antenna element 40 is stored.

  Therefore, the antenna element 40 is accommodated inside the inner periphery of the glass edge 82, and the upper part thereof is covered with the dial ring 83. Further, in this storage space, an annular ground plate 90 made of metal is stored between the antenna element 40 and the ground plane 38. The ground plate 90 is electrically connected to the back cover 85 through the conduction spring 24. Since the back cover 85 is fixed to the case body 81, the ground plate 90 is also electrically connected to the case body 81. Yes.

  The antenna element 40 is formed by using an annular dielectric as a base material and forming an antenna pattern made of metal or other dielectric material on the base material by plating or silver paste printing. In the present embodiment, the antenna element 40 is disposed around the dial plate 11, is accommodated on the inner peripheral surface side of the glass edge 82, and is covered with a dial ring 83 and a cover glass 84. Here, the antenna element 40 is provided with an inclined surface TP1 that is inclined at the same angle as the mortar-shaped portion of the dial ring 83.

  In addition, the dielectric base material of the antenna element 40 is formed such that a relative dielectric constant εr is about 5 to 20 by mixing a dielectric material such as titanium oxide, which can be used at high frequencies, with a resin. Thereby, the antenna can be further downsized in combination with the shortening of the wavelength of the dielectric.

For example, the frequency of the radio wave from the GPS satellite 20 is about 1.575 GHz, and one wavelength is 19 cm. In order to embed a normal antenna in a glass edge 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, εr = 5 to 20 is used as the dielectric. 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, the antenna element 40 includes an inclined surface TP so as to be inclined at the same angle as the inclined surface of the dial ring 83. Specifically, the inclined surface TP is connected to the upper surface and is inclined with respect to the dial plate 11, and is formed such that the height with respect to the dial plate 11 decreases toward the inner side.

  The antenna element 40 is fed through a feeding point, and a feeding pin 44 disposed on the lower surface of the antenna is connected to the feeding point. The power supply pin 44 is a pin-shaped connector formed of metal, and protrudes from the circuit board 25, passes through an insertion hole opened in the ground plane 38, and is inserted into the storage space. The antenna element 40 in the storage space is connected.

  Since the position of the antenna element 40 is set on the lower surface of the cover glass 84, it is possible to ensure good reception. Moreover, since the upper portion of the antenna element 40 is covered with the dial ring 83, the antenna element 40 is not exposed and can be designed on the dial ring 83. There is no reduction. And since the position of the antenna element 40 is set outside the dial plate 11, the degree of freedom in designing the dial plate 11 is not lowered.

  Further, as shown in FIG. 3, a light transmissive dial plate 11, a solar panel 87 that performs photovoltaic power generation, a dial plate 11, a solar panel 87, and a ground plane 38 penetrate through the inner periphery of the antenna element 40. There are provided a pointer shaft 12 and a plurality of hands 13 (second hand 13a, minute hand 13b, and hour hand 13c) that go around the pointer shaft 12 and indicate the current time.

  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 ground plane 38 and the dial plate 11 inside the inner periphery of the antenna element 40. A hole through which the pointer shaft 12 passes is formed at the center of the solar panel 87.

  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 material and is formed of a light transmissive 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. A hole through which the pointer shaft 12 passes is formed at the center of the dial plate 11. The pointer 13 is disposed inside the inner periphery of the antenna element 40 and between the cover glass 84 and the dial plate 11.

  A drive mechanism (drive unit) 30 that rotates the pointer shaft 12 to drive the plurality of hands 13 is attached to the lower side (back side) of the base plate 38. The drive mechanism 30 includes a step motor M and a wheel train such as a gear, and the step motor M drives the plurality of hands 13 by rotating the needle shaft 12 through the wheel train. Specifically, the drive mechanism 30 moves the pointer shaft 12 so that the hour hand 13c makes one revolution around the pointer shaft 12 in 12 hours, the minute hand 13b makes one revolution in 60 minutes, and the second hand 13a makes one revolution in 60 seconds. Rotate.

  The electronic timepiece 100 also includes a substrate 25 inside the exterior case 80. The substrate 25 is formed of a material containing resin or other 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, penetrates the ground plate 90 and contacts the antenna element 40, penetrates the ground plane 38, and contacts the substrate 25. Therefore, the power feeding means of the antenna element 40 is electrically connected to the substrate 25 (strictly speaking, a wiring provided on the substrate 25) via the power feeding pin 44, and a predetermined potential is supplied from the substrate 25 to the antenna element 40. Have been supplied.

  The circuit block including the GPS receiving unit 26 and the control unit 70 is covered with a shield 96 formed of a conductive material. The shield 96 is electrically connected to the ground plate 90 via the circuit retainer 39, the back cover 85, and the case body 81. The shield 96 is supplied with the ground potential of the circuit block. That is, the potentials of the shield 96, the back cover 85, the case body 81, and the ground plate 90 are maintained at the ground potential of the circuit block, and function as a ground plane.

  Between the drive mechanism 30 and the ground plane 38, magnetic resistant plates S1 and S2 are provided, and between the drive mechanism 30 and the substrate 25, a magnetic resistant plate S3 is provided. Hereinafter, the magnetic resistant plates S1 and S2 may be collectively referred to as a first magnetic resistant plate, and the magnetic resistant plate S3 may be collectively referred to as a second magnetic resistant 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, metals such as the case body 81 and the back cover 85 generate 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 and a battery storage unit 28 for storing the secondary battery 27 inside the exterior case 80.

  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).

  A crown 16 and operation buttons 17 and 18 are provided outside the outer case 80 (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 18) that occurs when the user of the electronic timepiece 100 presses the operation button 17 (or 18) is omitted through a button shaft that penetrates the exterior case 80. Is transmitted to the switch. The switch converts the pressure from the operation button 17 (or 18) into an electrical signal and transmits the electrical signal to the control unit 70.

  Next, how to attach the antenna element 40 and the dial ring 83 will be described. In the present embodiment, as shown in FIG. 4, the ground plane 38 is formed with an inner peripheral side wall 38a and an antenna element accommodating portion 38c surrounded by the outer peripheral side wall 38b. A ring-shaped ground plate 90 as a biasing member made of metal is attached to the housing portion 38c, and the ground plate 90 and the antenna element 40 are engaged to fix the antenna element 40 to the ground plate 38. .

  The ground plate 38 is formed with antenna protrusions 112 as antenna engaging portions extending in the vertical direction at four locations. The ground plate 90 has a plurality of insertion holes through which the antenna protrusions 112 are inserted. 93 is formed. By inserting the antenna protrusion 112 into these insertion holes 93, the ground plate 90 is positioned in the plane direction and the rotation direction of the ground plane 38.

  Also, as shown in FIG. 4, the ground plate 90 has conductive portions 91 formed at four locations on the outer peripheral portion, and these conductive portions 91 are configured to contact the inside of the exterior case 80. The

  Next, five screws 111 are engaged with the screw holes 110 formed at five locations of the ground plate 38 through the plurality of insertion holes 92 formed in the ground plate 90, and the ground plate 90 is attached to the ground plate 38. Make sure to fix it firmly. As described above, in the present embodiment, the ground plate 90 is not attached in close contact with the housing portion 38c over the entire surface, but is attached so that the ground plate 90 is partially in close contact with the ground plate 38 by the plurality of screws 111. Yes.

  An antenna concave portion that engages with the antenna protruding portion 112 described above is formed in the lower portion of the antenna element 40, and the antenna protruding portion 112 of the ground plane 38 is fitted into the antenna concave portion of the antenna element 40, thereby 40, the position of the ground plane 38 in the plane direction and the rotation direction is determined.

  Further, on the ground plane 38, dial ring projections 115 as dial ring engaging portions extending in a direction perpendicular to the surface of the ground plane 38 are provided on the ground plane 38 on the inner peripheral side of the antenna projection 112. Is formed. In addition, the lower part of the antenna element 40 is formed with a dial ring recess as an upper member side recess that engages with the dial ring protrusion 115 described above. In this embodiment, the dial ring protrusion 115 and the dial ring are provided. The upper member locking portion is constituted by the recess. The dial ring protrusion 115 of the base plate 38 is fitted into the dial ring concave portion of the antenna element 40, whereby the dial ring 83 is positioned in the planar direction and the rotational direction of the base plate 38. In addition, a recessed part may be formed in a ground plate, and a protrusion part may be formed in an antenna element and a dial ring.

  Furthermore, hooks 94 are formed at four locations on the ground plate 90, and hook-shaped protrusions 41 are formed on the antenna element 40 as engaging portions that engage with the hooks 94. The base plate 38 is formed with pedestals 113 as reference surfaces for determining the position of the antenna element 40 in the vertical direction at a plurality of locations.

  Therefore, after the ground plate 90 is attached to the ground plane 38, the antenna element 40 is attached so that the antenna protrusion 112 of the ground plane 38 and the concave portion of the antenna element 40 are engaged. To touch. Further, when the hook 94 of the ground plate 90 is engaged with the hook-shaped protrusion 41 formed on the antenna element 40, the antenna element 40 is biased in the direction of the ground plane 38 by the elastic force of the ground plate 90. , Pressed against the pedestal 113. In this way, the antenna element 40 is reliably positioned in a direction perpendicular to the surface of the ground plane 38.

  As shown in FIG. 4, the position at which the hook 94 and the protrusion 41 are engaged and the position at which the ground plate 90 is attached to the ground plane 38 by the screw 111 have a predetermined gap in the rotation direction of the ground plane 38. Is set to By setting in this way, the ground plate 90 can be given an elastic force, and even when the antenna element 40 is displaced by vibration or the like, it can be returned to the original position by the elastic force of the ground plate 90. Details will be described later.

<B: Circuit configuration of electronic timepiece with built-in antenna>
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, 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. 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 element 40, a balun 10, and a SAW (Surface Acoustic Wave) filter 32. The antenna element 40 receives satellite signals from a plurality of GPS satellites 20 as described with reference to FIG. However, since the antenna element 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 element 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 via the drive 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 measured inside the electronic timepiece 100, is counted by the RTC 72 that is always 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: Positioning structure of antenna element of electronic timepiece with built-in antenna>
Next, the positioning structure of the antenna element 40 in the electronic timepiece 100 according to the present embodiment will be described in detail.

  As shown in FIG. 4, the electronic timepiece 100 of this embodiment includes a ground plane 38, a ring-shaped ground plate 90 made of metal, an antenna element 40, and a dial ring 83. In the ground plate 90, conductive portions 91 extending below the ground plate 90 are formed at four locations on the outer peripheral portion.

  The ground plane 38 has an inner peripheral wall 38a and an antenna element accommodating portion 38c surrounded by the outer peripheral side wall 38b. When attaching the ground plate 90 to the ground plate 38, first, the antenna protrusion 112 formed on the ground plate 38 is inserted into the insertion hole 93 of the ground plate 90, and the ground plate 90 is placed in the housing portion 38 c. By inserting the antenna protrusion 112 into the insertion hole 93, the ground plate 90 is positioned in the plane direction and the rotation direction of the ground plane 38. The conducting portion 91 contacts the inside of the outer case 80, and conduction with the metal outer case 80 is achieved.

  Screw holes 110 are formed at five locations in the ground plate 38, and insertion holes 92 are formed in the ground plate 90 at positions corresponding to these screw holes 110. When the ground plate 90 is temporarily fixed to the ground plate 38, temporary fixing is performed so that the positions of the insertion holes 92 of the ground plate 90 and the screw holes 110 of the ground plate 38 coincide. Then, the plurality of screws 111 are engaged with the screw holes 110 to firmly fix the ground plate 90 to the ground plate 38. In this state where the ground plate 90 is attached to the ground plane 38, the antenna protrusion 112 protrudes in a direction perpendicular to the surface of the ground plane 38 through the insertion hole 93 as shown in FIG. 6.

  As shown in FIG. 6, an antenna recess 42 that engages with the antenna protrusion 112 is formed in the lower portion of the antenna element 40. When attaching the antenna element 40, it attaches so that the antenna protrusion part 112 formed in the ground plane 38 and the antenna recessed part 42 of the antenna element 40 may engage.

  As shown in FIG. 4, the antenna protrusion 112 is formed in a columnar shape, and the antenna recess 42 of the antenna element 40 corresponding to this is also formed in a cylindrical shape. Therefore, when the antenna protrusion 112 of the ground plane 38 is fitted into the antenna recess 42 of the antenna element 40, the antenna element 40 is positioned in the plane direction of the ground plane 38, and the center of the ground plane 38, The virtual center of the antenna element 40 matches.

  In addition, the antenna element 40 is also positioned in the rotational direction of the ground plane 38 by fitting the antenna recess 42 and the antenna protrusion 112 together. Thus, the antenna element 40 is positioned with respect to the ground plane 38 in the plane direction and the rotation direction.

  On the ground plate 90, hooks 94 extending in the upward direction of the ground plate 90 are formed at four locations. The hook 94 is formed with a through hole 95 as shown in FIG. Further, as shown in FIG. 7A, a hook-like protrusion 41 is formed in the antenna element 40 at a position corresponding to the hook 94.

  Further, as shown in FIG. 4, the base plate 38 is formed with a plurality of pedestal portions 113 serving as reference planes for the positions of the antenna elements 40 in the vertical direction with respect to the base plate 38. The pedestal portion 113 has a substantially cylindrical shape, and the upper surface thereof is formed in parallel to the surface of the ground plane 38. Further, the height of each pedestal portion 113 is formed to be the same height as the surface of the main plate 38.

  Therefore, when the antenna element 40 is attached so that the antenna protrusion 112 of the ground plane 38 and the antenna recess 42 of the antenna element 40 are engaged after the ground plane 90 is attached to the ground plane 38, as shown in FIG. In addition, the lower surface of the antenna element 40 contacts the upper surface of the pedestal 113 at a plurality of locations.

  7A shows a cross section of the antenna element 40, the hook 94 of the ground plate 90, and the ground plane 38, and FIG. 7B is a view seen from the direction of arrow A shown in FIG. 7A. . As shown in FIGS. 7A and 7B, when the antenna element 40 is placed on the pedestal portion 113, the through hole 95 of the hook 94 and the hook-like protrusion 41 of the antenna element 40 are engaged. It does n’t match.

  From this state, as shown in FIG. 8 (A), the hook 94 is pulled upward, that is, in the direction of arrow B shown in FIG. 8 (A), and the upper portion of the through-hole 95 of the hook 94 and the antenna element 40 The projecting portion 41 is engaged. As a result, as shown in FIG. 8B, the hook-shaped protruding portion 41 protrudes from the through hole 95 of the hook 94.

  Since the ground plate 90 is fixed to the ground plate 38 with the screw 111 as described above and is formed of a metal having elasticity, the ground plate 90 is lifted in the direction of arrow B shown in FIG. The antenna element 40 engaged with the hook 94 is urged in the direction of the ground plane 38, that is, in the direction of arrow C in FIG. In this way, the antenna element 40 is reliably positioned in a direction perpendicular to the ground plane 38.

  Then, as shown in FIG. 6, a dial ring 83 is disposed above the antenna element 40 in the vertical direction. Specifically, as shown in FIG. 6, a dial ring recess 83 a is formed in the lower portion of the dial ring 83 as an upper member side recess that engages with the dial ring protrusion 115. When attaching the dial ring 83, the dial ring recess 83 a is attached to the dial ring protrusion 115 formed on the base plate 38.

  The dial ring protrusion 115 is an upper member side protrusion formed so as to protrude from the main plate 38 in the vertical direction. As shown in FIG. 4, the dial ring protrusion 115 is formed in a cylindrical shape, and a dial ring recess 83a corresponding to this is also formed. It is formed in a cylindrical shape. Therefore, when the dial ring protrusion 115 is fitted into the dial ring recess 83 a, the dial ring 83 is positioned in the plane direction of the base plate 38, and the center of the base plate 38 and the virtual of the dial ring 83 are determined. The central point is consistent. In the dial ring 83, the dial ring concave portion 83a and the dial ring protruding portion 115 are fitted together, whereby the position of the base plate 38 in the rotational direction is also determined. Thus, the dial ring 83 is positioned with respect to the main plate 38 in the planar direction and the rotational direction.

  Here, as shown in FIG. 6, the dial ring protrusion 115 and the antenna protrusion 112 have a length from the center of the dial ring protrusion 115 to the center of the antenna protrusion 112 that is a predetermined distance G2 in the radial direction. Are arranged as follows. As shown in FIG. 6, the distance G2 is set so that the gap 43 between the antenna element 40 and the dial ring 83 becomes a predetermined distance G1 when the antenna element 40 and the dial ring 83 are engaged with the ground plane 38, respectively. The distance is set.

  Thus, due to the positioning structure of the antenna element 40 in the present embodiment, the antenna element 40 is disposed in the storage space surrounded by the dial ring 83 and the glass edge 82, and the distance G1 between the dial ring 83 is constant. .

<D: Advantages of this embodiment>
In the present embodiment, the antenna element 40 and the dial ring 83 are engaged with the antenna protrusion 112 and the dial ring protrusion 115 and positioned with respect to the ground plane 38. The antenna protruding portion 112 and the dial ring protruding portion 115 are integrally formed from the ground plate 38 which is the same member, and predetermined in the radial direction so that the gap G1 between the antenna element 40 and the dial ring 83 is constant. They are arranged at a distance G2. Thereby, the dispersion | variation in the position of the antenna element 40 and the dial ring 83 can be suppressed. As a result, the influence of the dial ring 83 on the antenna element 40 can be made constant, and good reception performance of the antenna can be ensured.

  Further, the antenna element 40 is disposed in a storage space surrounded by the dial ring 83 and the glass edge 82. When an impact is applied to the timepiece or the timepiece vibrates, the antenna element 40 is stored in the storage space. Its position may change in space.

  However, in the present embodiment, from the engaging position where the hook 94 of the ground plate 90 and the protrusion 41 of the antenna element 40 are engaged to the position where the ground plate 90 is attached to the ground plate 38 with the screw 111, It is set to have a predetermined interval in the circumferential direction.

  Therefore, the ground plate 90 can be given an elastic force, and even when the antenna element 40 is displaced in the vertical direction due to an impact or the like, the antenna element 40 is urged by the elastic force of the ground plate 90, and the antenna element 40. Return to the original position.

  Further, the gap G1 between the antenna element 40 and the dial ring 83 is set in a range having the elastic force of the ground plate 90. That is, when the antenna element 40 is displaced from the steady state, the upper surface of the antenna element 40 contacts the lower surface of the dial ring 83.

  The gap G1 between the antenna element 40 and the dial ring 83 is set so as to have the elastic force of the ground plate 90 even when the upper surface of the antenna element 40 is in contact with the lower surface of the dial ring 83. The ground plate 90 can return the antenna element 40 to the steady state position by elastic force without plastic deformation. Therefore, the impact on the antenna element 40 is mitigated, and the antenna element 40 can be reliably prevented from being damaged.

  As described above, according to the present embodiment, the influence of the dial ring 83 on the antenna element 40 is made constant even when a dial ring made of plastic or the like is disposed in the vicinity of the upper portion of the antenna element 40 in the vertical direction. Thus, good reception performance of the antenna can be ensured. Further, even when an impact is applied to the watch or vibration is applied, the antenna element 40 can be reliably prevented from being damaged in the storage space, and the antenna element 40 can be reliably prevented from being damaged.

  Note that the numbers of the screw holes 110, the antenna protruding portions 112, the pedestal portions 113, and the antenna vertical surface portions 121 in this embodiment are merely examples, and are not limited to the above-described numbers, and may be increased or decreased as appropriate. Moreover, the ground plate 90 should just be a member which has an elastic force, and is not limited to a metal.

  Furthermore, in the above-described embodiment, an example in which the ground plate is formed in a ring shape has been described. However, the ground plate may be appropriately divided and attached to the ground plate. Further, in the above-described embodiment, the example using the hook having the through hole is described. However, the hook does not necessarily have such a shape and can be engaged with the protruding portion 41 of the antenna element. I just need it.

  DESCRIPTION OF SYMBOLS 100 ... Electronic timepiece with built-in antenna, 11 ... Dial, 12 ... Pointer shaft, 13 (13a, 13b, 13c) ... Pointer, 26 ... GPS receiver, 30 ... Drive mechanism, 38 ... Ground plate, 38a ... Dial ring recess, DESCRIPTION OF SYMBOLS 40 ... Antenna element, 41 ... Projection part, 42 ... Antenna recessed part, Antenna element, 80 ... Exterior case, 81 ... Case, 82 ... Glass edge, 83 ... Dial ring, 84 ... Cover glass, 85 ... Back cover, 87 ... Solar Panel, 90 ... Ground plate, 94 ... Hook, 95 ... Through hole, 110 ... Screw hole, 111 ... Screw, 112 ... Antenna protrusion, 113 ... Pedestal part, 115 ... Dial ring protrusion 115, 121 ... Antenna vertical surface part.

Claims (5)

A cylindrical outer case,
A main plate stored in the exterior case;
An annular antenna element housed in the outer case;
An upper member disposed above the antenna element and covering the antenna element;
An antenna engaging portion for positioning the antenna element with respect to the ground plane;
An upper member engaging portion for positioning the upper member with respect to the base plate,
The antenna-embedded electronic timepiece, wherein the antenna engaging portion and the upper member engaging portion are formed on the main plate. The antenna engaging portion positions the antenna element so as not to move in a plane direction and a rotation direction with respect to the ground plane,
The upper member engaging portion positions the upper member so as not to move in a plane direction and a rotation direction with respect to the base plate.
The electronic timepiece with a built-in antenna according to claim 1. The antenna engaging portion includes the antenna protruding portion formed to protrude in the vertical direction from the ground plane,
3. The antenna built-in electronic timepiece according to claim 1, wherein the antenna element is formed with an antenna recess that engages with the antenna protrusion. The upper member engaging portion includes the upper member side protruding portion formed to protrude in the vertical direction from the base plate,
3. The antenna built-in type electronic timepiece according to claim 1, wherein the upper member is formed with an upper member-side concave portion that engages with the upper-member-side protruding portion. 5. The antenna built-in type electronic timepiece according to claim 1, wherein the upper member is a dial ring having a ring shape corresponding to a shape of the antenna element.

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