JP6056320B2 - Electronic clock with built-in antenna - Google Patents

Description

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

  In recent years, electronic timepieces have been developed that receive radio waves from position information satellites such as GPS (Global Positioning System) satellites and 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 equipped with such a ring-shaped antenna, it is arranged around the time display portion (for example, dial plate) of the electronic timepiece inside the exterior case.

  Conventionally, in order to keep the distance between the antenna and the outer case constant, it may be possible to hold the antenna in the outer case, but it is necessary to guarantee the antenna reception performance while the antenna built-in electronic watch is driven Therefore, the antenna is positioned and fixed with respect to the movement in the manufacturing process.

JP 2011-21929 A

  However, since the exterior case located near the antenna is made of metal or the like, if the ring-shaped antenna is placed close to the metal case, the resonance frequency, which is the antenna characteristic, is shifted. It becomes. Therefore, in an electronic timepiece with a built-in antenna, it is important to keep the distance between the antenna and the outer case constant and to keep the influence degree of the outer case constant in order to keep the radio wave reception performance of the antenna good.

  The present invention has been made in view of the above-described circumstances, and in an electronic timepiece with a built-in antenna including an antenna positioned and fixed to a movement, the distance between the antenna and the outer case is kept constant, and the antenna has good reception performance. It is set as a solution subject to ensuring.

  In order to solve the above problems, an electronic timepiece with a built-in antenna according to the present invention includes a cylindrical outer case, a time display unit for displaying time inside the outer case, and a display direction opposite to the display direction of the time display unit. A back cover that closes the opening on the side, a base plate that holds a movement that drives the time display unit inside the outer case, and an inner side surface of the outer case on the time display unit side in the radial direction of the outer case A vertical positioning surface projecting toward the surface, and an annular antenna element housed in the exterior case and positioned with respect to the movement, wherein the base plate engages with the back cover and moves the movement. And when the movement is pushed up to the time display side by the push-up part, the movement comes into contact with the vertical positioning surface. Characterized in that it comprises a movement upper surface positioning portion for positioning in a direction perpendicular to the instrumentation case.

  In the electronic timepiece with built-in antenna of the present invention, the antenna element is positioned with respect to the movement. And since the main plate has a push-up portion that pushes the movement to the time display side and a movement upper surface positioning portion that positions the movement in a direction perpendicular to the outer case, the outer case is attached to the main plate on the back cover. By fitting, the reaction force from the back cover acts on the base plate, the movement is positioned and fixed in the vertical direction with respect to the outer case, and the antenna element is also positioned and fixed in the vertical direction with respect to the outer case. . Thereby, the distance between the antenna element and the outer case can be kept constant, and the influence of the outer case can be kept constant, and the radio wave reception performance of the antenna can be kept good.

  In the present invention, a horizontal positioning surface is formed on the inner side surface of the outer case, and a ground plate outer diameter engaging portion that is in contact with the horizontal positioning surface and performs horizontal positioning with respect to the outer case is formed on the base plate. May be formed. In this case, since the movement is positioned and fixed in the horizontal direction with respect to the outer case, the antenna element is also positioned and fixed in the horizontal direction with respect to the outer case. Thereby, the distance between the antenna element and the outer case can be kept constant, and the influence of the outer case can be kept constant, and the radio wave reception performance of the antenna can be kept good.

  In the present invention, “tubular” includes a rotating body represented by a cylinder. In addition, “annular” 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. Further, the “time display unit” includes a dial of a clock, 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. 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 base plate in the present invention, the first member is disposed on the back side of the first member, constituted by a second member is softer material than the first member, the base plate to said first member An outer diameter engaging portion and a movement upper surface positioning portion may be provided, and the push-up portion may be provided on the second member.

  In this case, since the push-up part is formed of a soft material, even if excessive pressure acts from the back cover, it is deformed slightly due to its flexibility and elasticity, and the pressure is absorbed and damaged. There is nothing to do. Then, by obtaining reaction force from the back cover and transmitting it to the upper first member, the movement upper surface positioning part is pressed against the vertical positioning surface of the outer case, and the main plate is positioned in the vertical direction with respect to the outer case. Fixed. Moreover, since the main plate outer diameter engaging portion and the movement upper surface positioning portion are formed of a hard member, the movement can be pressed to the outer case side and appropriately fixed.

In the present invention, the push-up portion can be formed by a member separated from the main plate. In this case, the push-up part can be composed of a member made of a material different from that of the main plate, and the flexibility for the reaction force from the back cover and the strength necessary for fixing the movement can be set respectively. The ease and the degree of freedom can be increased.

In the present invention, the push-up portion is disposed between the base plate and the exterior case, and has a middle frame outer diameter engaging portion that is in contact with a horizontal positioning surface formed on the inner surface of the exterior case, An inner frame inner diameter positioning surface that comes into contact with the outer diameter engaging portion of the main plate provided on the outer peripheral surface, a middle frame push-up portion that engages with the back cover and pushes the movement toward the time display side, and an outer peripheral surface of the main plate. You may make it provide the base-plate pushing-up part contact | abutted to the formed level | step difference part.

In this case, even if the push-up portion is a member different from the ground plate, the ground plate is positioned and fixed in the horizontal direction and the vertical direction with respect to the exterior case by using the push-up portion . Specifically, since the upper part is provided with an inner frame outer diameter engaging part and an inner frame inner diameter positioning surface, when the upper part is mounted between the main plate and the outer case, the outer main body outer diameter engaging part is provided. Is in contact with the inner frame inner diameter positioning surface, and the inner frame outer diameter engaging portion is in contact with the horizontal positioning surface, so that the inner frame outer diameter engaging portion is pushed outward. As a result, the movement is positioned and fixed in the horizontal direction with respect to the outer case.

In addition, since the push-up part is provided with a middle frame push-up part and a base plate push-up part, a reaction force from the back cover acts on the push-up part by fitting an exterior case to the base plate on the back cover. The upper part of the frame is pushed in. This pushed-in force also acts on the ground plate pushing-up portion that abuts on the step portion formed on the outer peripheral surface of the ground plate, and the ground plate pushing-up portion pushes the ground plate upward. Thereby, according to this invention, the movement upper surface positioning part provided in the baseplate is pressed by the vertical direction positioning surface of an exterior case, and a movement is positioned and fixed to a perpendicular direction with respect to an exterior case.
Also, in one embodiment of the electronic timepiece with an internal antenna described above, the antenna element receives radio waves from positioning information satellites, the movement is to be driven to display the time based on radio waves received preferable. In this case, it is possible to display the accurate time.

  Thus, according to the present invention, the antenna is positioned and fixed in the horizontal and vertical directions with respect to the exterior case by positioning and fixing the movement in the horizontal and vertical directions with respect to the exterior case. It becomes. Thereby, the distance between the antenna element and the outer case can be kept constant, the influence degree of the outer case can be made constant, and the radio wave reception performance of the antenna can be kept good.

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. (A) is a side view of the electronic timepiece 100, and (B) 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. 3 is a partial cross-sectional view showing a fixing structure between a movement and an outer case of the electronic timepiece 100. FIG. FIG. 7A is a top view showing a pressed state of the main plate outer diameter engaging portion of the electronic timepiece 100 and the horizontal positioning surface 81a, and FIG. 7B is a partially enlarged view of FIG. It is. 8A is a side view showing the push-up portion of the electronic timepiece 100, and FIG. 8B is a cross-sectional view taken along the line AA in FIG. It is a side view of the electronic timepiece 200 which concerns on a modification. FIG. 10 is a partial cross-sectional view illustrating a fixing structure between a movement and an exterior case of an electronic timepiece according to a modification.

  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 relates to 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. For example, the dial ring 83 is provided with numbers 1 to 12 indicating the time every 30 degrees, and the dial plate 11 is provided with a bar-type index, for example, 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. Hereinafter, the dial plate 11 may be referred to as a time display unit.

  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).

  3A is a side view showing the internal structure of the electronic timepiece 100, FIG. 3B is a partial cross-sectional view showing the internal structure of the electronic timepiece 100, and FIG. It is a disassembled perspective view. As shown in FIG. 3A, the electronic timepiece 100 includes an exterior case 80, a back cover 85 that closes the opening opposite to the display direction of the time display unit, a drive mechanism 30 that drives the time display unit, and the like. It is formed of a main plate 120 that holds the movement 110.

  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. 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. A base plate 120 is provided below the dial ring 83 on the inner side of the inner periphery of the case body 81.

  The base plate 120 is a base that holds the drive mechanism 30 and the like, and is fitted into the exterior case 80 as shown in FIG. 3A, and the hands 13 and the like are arranged on the time display unit side. The ground plate 120 is a non-conductive material, and is formed of a hard member (first member) having a certain strength. Here, the hard material means that deformation with respect to compressive force or tensile force is small. For example, PPS (polyphenylene sulfide), PTES (polythioether sulfone), PC (polycarbonate), LCP (liquid crystal polymer), PA ( Synthetic resins such as polyamide).

  A circuit seat 130 is provided below the main plate 120. The circuit receiving seat is a member that obtains a reaction force from the back cover 85 and transmits the reaction force to the upper base plate 120 and houses the circuit block 21 including the substrate 25. The circuit seat 130 is made of a non-conductive material that is softer than the ground plane 120 (second member). Here, the soft material means that it has a high flexibility with respect to a compressive force and a tensile force, and is deformed minutely due to the flexibility and elasticity, and is not easily damaged. For example, POM (polyacetal), PAR (polyarylate) ) And the like.

  A donut-shaped storage space is defined by the base plate 120, the circuit receiving seat 130, the dial ring 83, and the inner periphery of the exterior case 80. In this storage space, the annular 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 120. The ground plate 90 is electrically connected to the case body 81 via a spring (not shown) provided on the ground plate 90 itself, and the back cover 85 is fixed to the case body 81. 90 is also electrically connected to the back cover 85. That is, the ground plate 90 is electrically connected to the ground of the substrate 25 through a path such as the ground plate 90 → the spring provided on the ground plate → the case body 81 → the back cover 85 → the conductive spring 24 → the ground of the circuit board 25. ing. Further, the antenna element 40 is fitted in a projecting member (not shown) formed on the upper surface of the ground plate 120 so that the antenna element 40 is positioned in the horizontal direction and the circumferential direction with respect to the ground plate 120. Is suppressed.

  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.

  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 the present embodiment, since the wavelength shortening by the dielectric is (εr) 1/2, in the present embodiment, εr = about 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.

  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, protrudes from the circuit board 25, passes through an insertion hole opened in the ground plane 120, 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. 3B, on the inner side of the inner periphery of the antenna element 40, a light-transmitting dial plate 11, a solar panel 87 that performs photovoltaic power generation, a dial plate 11, a solar panel 87, and a ground plane A pointer shaft 12 penetrating 120 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 are provided.

  The solar panel 87 is a circular flat plate in which a plurality of solar cells (photovoltaic elements) that convert light energy into electric energy (electric power) are connected in series. The solar panel 87 is disposed between the base plate 120 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 120. 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.

  As shown in FIG. 3B, 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 main plate 120. 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 21 including a GPS receiving unit (wireless receiving unit) 26, a control unit 70, and the like 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 120, and contacts the substrate 25. Therefore, the power feeding means of the antenna element 40 is electrically connected to the substrate 25 (strictly speaking, wiring provided on the substrate 25) via the power feeding pin 44, and the received signal from the antenna element 40 to the substrate 25 is received. Is supplied.

  The circuit block 21 including the GPS receiving unit 26 and the control unit 70 is covered with a member having a shielding effect formed of a conductive material, and is connected to the ground via the circuit retainer 39, the back cover 85, and the case body 81. The plate 90 is electrically connected. The ground potential is supplied to the circuit block 21 through the conduction spring 24. That is, the potentials of the circuit holder 39, 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 120, 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 21 provided on the substrate 25 may also 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.

<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 and a SAW (Surface Acoustic Wave) filter 32. The antenna element 40 receives satellite signals from a plurality of GPS satellites 20 as described in connection with 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 receiver 26 includes an RF (Radio Frequency) unit 50 and a baseband unit 60. As will be described below, the GPS receiver 26 performs a process of acquiring satellite information such as orbit information and GPS time information included in the navigation message from the 1.5 GHz band satellite signal extracted by the SAW filter 32.

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

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

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

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

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

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

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

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

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

  On the other hand, in the position information acquisition mode, more specifically, the baseband unit 60 performs positioning calculation based on GPS time information and orbit information, and the position information (more specifically, the electronic timepiece 100 is Get the latitude and longitude of the location.

  Further, the baseband unit 60 refers to the time difference information stored in the flash memory 66 and acquires time difference data associated with the coordinate values (for example, latitude and longitude) of the electronic timepiece 100 specified by the position information. . In this way, the baseband unit 60 generates satellite time data (GPS time information) and time difference data as time correction information. As described above, the time correction information in the position information acquisition mode may be the GPS time information and the time difference data itself. For example, instead of the GPS time information, the time correction information is a time difference data between the internal time information and the GPS time information. Also good.

  The baseband unit 60 may generate time correction information from the satellite information of one GPS satellite 20, or may generate time correction information from the satellite information of a plurality of GPS satellites 20.

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

  The control display unit 36 includes a control unit 70, a drive circuit 74, and a crystal resonator 73. The control unit 70 includes a storage unit 71 and an RTC (Real Time Clock) 72 and performs various controls. The control unit 70 can be configured by a CPU, for example. The controller 70 sends a control signal to the GPS receiver 26 and controls the reception operation of the GPS receiver 26. Further, the control unit 70 controls the operation of the regulator 34 and the regulator 35 based on the detection result of the voltage detection circuit 37. The control unit 70 controls the driving of all the hands 13 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 counted by the electronic timepiece 100, is counted by the RTC 72 that is constantly driven, and is updated by a reference clock signal generated by the crystal unit 73. Therefore, even if the power supply to the GPS receiver 26 is stopped, the internal time information can be updated and the hand movement of the pointer can be continued.

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

<C: Fixed structure of electronic watch with built-in antenna>
Next, the fixing structure of the electronic timepiece 100 of this embodiment will be described in detail. FIG. 6 is a partial cross-sectional view showing a fixing structure between the movement of the electronic timepiece 100 and the exterior case. FIG. 7A is a top view showing a contact state between the main plate outer diameter engaging portion 121 of the electronic timepiece 100 and the horizontal positioning surface 81a, and FIG. 7B is a part of FIG. It is an enlarged view. FIG. 8A is a side view showing the push-up portion 131 of the electronic timepiece 100, and FIG. 8B is a cross-sectional view taken along line AA in FIG.

  First, a fixing structure between the back cover 85 and the case body 81 will be described. As shown in FIG. 6, the outer periphery of the back cover 85 is provided with a horizontal engaging portion 85 c that is a screw that is screwed into the case body 81, and for positioning and fixing in the vertical direction with respect to the case body 81. And a vertical engaging portion 85a that is in contact with the outer periphery. In addition, the case body 81 is provided with a screw portion 81c that is screwed into the horizontal engagement portion 85c, and a packing 81d that is pressed against and closely contacts the vertical engagement portion 85a.

  With such a configuration, the horizontal engagement portion 85 c and the screw portion 81 c are screwed together, whereby the back cover 85 is positioned in the horizontal direction with respect to the case body 81. Further, when the vertical engaging portion 85a is brought into close contact with the packing 81d, the position of the back cover 85 in the vertical direction with respect to the case body 81 is determined.

  Next, a fixing structure in the horizontal direction between the main plate 120 and the case body 81 will be described. As shown in FIG. 6, the case cylinder 81 is formed with a horizontal positioning surface 81 a formed on the inner surface of the case cylinder 81. Further, as shown in FIGS. 7A and 7B, the outer peripheral surface of the main plate 120 is pressed by the horizontal positioning surface 81 a to position the main plate outer diameter engaging portion 121 in the horizontal direction with respect to the case body 81. A plurality of are formed.

  With such a configuration, when the movement 110 is stored in the case body 81, the main plate outer diameter engaging portion 121 is pressed against the horizontal positioning surface 81a, and the main plate outer diameter engaging portion 121 is pressed outward. . Thereby, the movement 110 is positioned and fixed in the horizontal direction with respect to the case body 81.

  Next, a fixing structure in the vertical direction between the movement 110 and the case body 81 will be described. As shown in FIG. 6, the case cylinder 81 is provided with a vertical positioning surface 81 b that protrudes radially inward of the case cylinder 81 on the inner surface of the case cylinder 81 on the time display unit side. On the other hand, the main plate 120 is provided with a movement upper surface positioning portion 122 that is pressed by the vertical positioning surface 81 b and positions the movement 110 in the vertical direction with respect to the case body 81.

  In the present embodiment, a push-up portion 131 that pushes up the movement 110 to the time display side is formed. Specifically, as shown in FIG. 6, the push-up portion 131 is formed on the circuit receiving seat 130 of the movement 110 and has a shape protruding toward the back cover 85. On the other hand, the back cover 85 is provided with a push-up engaging portion 85 b that engages with the push-up portion 131 at a location facing the push-up portion 131. Here, as shown in FIGS. 8 (A) and 8 (B), the push-up portion 131 has a protruding portion 131a protruding downward, and the back cover 85 in a state where the movement 110 is housed inside. Is attached to the case body 81, it fits into the push-up engaging portion 85b.

<D: Advantages of this embodiment>
According to this embodiment, the antenna element 40 is positioned in the horizontal direction with respect to the movement 110. Then, by fitting the exterior case 80 on the base plate 120 on the back cover 85, a reaction force from the back cover 85 acts on the base plate 120, and the movement upper surface positioning portion 122 of the base plate 120 and the circuit seat 130 are pushed up. The movement 110 is positioned and fixed in the vertical direction with respect to the outer case 80 by the portion 131, and the movement 110 is positioned and fixed in the horizontal direction with respect to the outer case 80 by the main plate outer diameter engaging portion 121 of the main plate 120. The antenna element 40 is also positioned in the horizontal direction and the vertical direction with respect to the outer case 80. As a result, the distance between the antenna element 40 and the outer case 80 can be kept constant, the influence of the outer case 80 can be kept constant, and the radio wave reception performance of the antenna can be kept good.

  Further, in the present embodiment, the push-up portion 131 of the circuit receiving seat 130 arranged on the back cover 85 side is formed of a material that is more flexible than the base plate 120, so that the push-up portion 131 is pushed in and the back cover 85. Even when an excessive pressure is applied, it is deformed minutely due to its flexibility and elasticity, and is not damaged by absorbing the pressure. Then, by obtaining a reaction force from the back cover 85 and transmitting the reaction force to the upper base plate 120, the movement upper surface positioning portion 122 is brought into contact with the vertical positioning surface 81 b of the outer case, and the movement 110 is moved against the case body 81. And fixed in the vertical direction.

  In addition, since the base plate 120 is formed of a hard member, it can protect the driving mechanism 30 and the like housed therein, and can press the movement toward the case body 81 and can be appropriately fixed. . Furthermore, according to the present embodiment, since a member for fixing the movement is not necessary, the number of parts can be reduced, and the space for arranging the movement can be expanded.

<E: Modification>
The present invention is not limited to the above-described embodiments, and various modifications as described below are possible, for example. FIG. 9 is a side view showing an electronic timepiece 200 according to this modification, and FIG. 10 is a partial sectional view showing a fixing structure of the electronic timepiece 200 according to this modification. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the functions and the like are the same unless otherwise specified, and the description thereof is omitted.

  In the above-described embodiment, the base plate 120 and the circuit receiving base 130 are formed of different members, and the positioning is performed in the vertical direction of the timepiece using the circuit receiving base 130. However, in this modification, the base plate 120 and the circuit receiving base 130 are used. The gist is the case where the seat 130 is formed of the same member, and the timepiece is positioned in the vertical direction using the middle frame 140 separated from the main plate 120.

  As shown in FIG. 9, the fixing structure of the movement 110 a in this modification is formed of a ground plate 120 and a circuit receiving seat 130, a middle frame 140, and a case body 81 that constitute the movement 110 a. In this modification, the ground plane 120 and the circuit receiving seat 130 are integrally formed, and the material is formed of a hard material having a certain strength.

  An intermediate frame 140 is disposed between the base plate 120 and the circuit receiving seat 130 and the case body 81. The middle frame 140 is a member for positioning the movement 110a to the exterior case 80, and is formed of a member that is softer than the base plate 120 and has an elastic force. As shown in FIG. 10, the middle frame 140 is configured to position the movement 110 a in the horizontal direction with respect to the case body 81, and as shown in FIG. 10, the middle frame outer diameter engaging portion 141 is in contact with the horizontal positioning surface 81 a. And an inner frame inner diameter positioning surface 142 that comes into contact with the outer diameter engaging portion 123 of the main plate provided on the outer peripheral surface of the main plate 120.

  As a result, when the middle frame 140 is mounted between the movement 110a and the case body 81, the base plate outer diameter engaging portion 123 comes into contact with the inner frame inner diameter positioning surface 142, and the middle frame outer diameter engaging portion 141 is in the horizontal direction. The middle frame outer diameter engaging portion 141 is pushed outward by coming into contact with the positioning surface 81a. Thereby, the movement 110 a is positioned and fixed in the horizontal direction with respect to the case body 81.

  The middle frame 140 has a middle frame push-up portion 144 that engages with the back cover 85 and pushes the movement to the time display side as a configuration for positioning the movement 110a in the vertical direction with respect to the case body 81. A ground plate push-up portion 143 that comes into contact with the lower surface 124 of the ground plate 120 provided at the step portion of the movement 110a is provided. Here, like the push-up portion 131, the middle frame push-up portion 144 has a protruding portion that protrudes downward. Further, a movement upper surface positioning portion 122 that abuts on the vertical positioning surface 81b of the outer case 80 is provided on the movement 110a side.

  Accordingly, when the movement 110a is disposed in the case body 81 and the back cover 85 is fitted from the opening on the back cover 85 side of the case body 81, the protruding portion is fitted into the push-up engagement portion 85b of the back cover 85. . When the case body 81 is fitted into the base plate 120 on the back cover 85, the middle frame push-up portion 144 causes a reaction force from the back cover 85 to act on the base plate 120, so that the middle frame push-up portion 144 is pushed in, and the base plate push-up is performed. The part 143 pushes up the lower surface 124 arranged on the upper surface.

  When the main plate push-up portion 143 pushes the lower surface 124 upward, the movement upper surface positioning portion 122 located at the upper portion is pressed by the vertical positioning surface 81 b of the case body 81, and the movement 110 a is perpendicular to the case body 81. Is fixed to the position. As a result, according to the present modification, the distance between the antenna element 40 and the outer case 80 can be kept constant, the influence of the outer case 80 can be kept constant, and the radio wave reception performance of the antenna can be kept good. it can. Furthermore, in this modification, since the inner frame 140 is made of a member made of a material different from that of the main plate 120, flexibility for reaction force from the back cover 85 and strength necessary for fixing the movement are set. It is possible to increase the ease of design and the degree of freedom.

DESCRIPTION OF SYMBOLS 100,200 ... Electronic timepiece with built-in antenna, 11 ... Dial plate, 12 ... Pointer shaft, 13 (13a, 13b, 13c) ... Pointer, 26 ... GPS receiver, 30 ... Drive mechanism, 40 ... Antenna element, 80 ... Exterior Case: 81 Case casing, 81a Horizontal positioning surface, 81b Vertical positioning surface, 82 Glass edge, 83 Dial ring, 84 Cover glass, 85 Back cover, 87 Solar panel, 90 Ground plate 120 ... Ground plate, 121 ... Ground plate outer diameter engagement portion, 122 ... Movement upper surface positioning portion, 123 ... Ground plate outer diameter engagement portion, 124 ... Lower surface, 130 ... Circuit seat, 131 ... Push-up portion, 140 ... Medium frame, Reference numeral 141... Middle frame outer diameter engaging portion. 142... Middle frame inner diameter positioning surface. 143.

Claims (4)

A cylindrical outer case,
A time display unit for displaying the time inside the outer case;
A back cover that closes the opening opposite to the display direction of the time display unit;
A base plate for holding a movement for driving the time display unit inside the exterior case;
On the inner surface of the outer case on the time display part side, a vertical positioning surface that protrudes radially inward of the outer case;
An annular antenna element housed in the exterior case and positioned with respect to the movement;
The main plate is
A push-up unit that engages with the back cover and pushes the movement toward the time display;
A movement upper surface positioning portion that contacts the vertical positioning surface and positions the movement in the vertical direction with respect to the outer case when the movement is pushed up to the time display side by the push-up portion ;
On the inner side surface of the outer case, a horizontal positioning surface is formed,
The ground plate has a plurality of ground plate outer diameter engaging portions that are in contact with the horizontal positioning surface and are positioned in the horizontal direction with respect to the exterior case, spaced apart from each other along the circumferential direction of the ground plate. An electronic timepiece with a built-in antenna, which is formed . The ground plate includes a first member and a second member that is disposed on the back cover side of the first member and is formed of a material softer than the first member. The antenna built-in type electronic timepiece according to claim 1, wherein a diameter engaging portion and a movement upper surface positioning portion are provided, and the push-up portion is provided on the second member. The electronic timepiece with built-in antenna according to claim 1 or 2, wherein the push-up portion is formed by a member separated from the base plate. The antenna element receives radio waves from a position information satellite,
The movement is driven to display the time based on the received radio waves.
The electronic timepiece with built-in antenna according to any one of claims 1 to 3 .

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