JP2022176758A - Electronic watch - Google Patents

Abstract

To provide an electronic watch that can certainly fix a movement and can prevent a reduction in reception performance.SOLUTION: An electronic watch comprises: an antenna that includes an annular substrate and an antenna element and receives a radio wave; a circuit board that includes a receiving unit for processing the radio wave received by the antenna, a power feeding terminal for feeding power to the antenna, and a ground terminal; a power feeding member that establishes conduction between the antenna element and the power feeding terminal; a conductor plate 160 that is arranged between the antenna and the circuit board in lateral view seen from a direction orthogonal to a central axis of the antenna; and a first fixing member 180A and second fixing members 180B that fix the conductor plate and the circuit board to each other. The first fixing member is arranged at a position closer to the power feeding member than the second fixing members in plan view seen from a direction of the central axis and fixes the conductor plate and the ground terminal in a conduction state, and the second fixing members fix the conductor plate and the ground terminal in an insulation state.SELECTED DRAWING: Figure 7

Description

The present invention relates to an electronic timepiece having a ring-shaped antenna.

In Patent Document 1, a conductor plate is arranged between a movement and a cover glass, a substantially annular antenna is arranged along the outer peripheral edge of the conductor plate, and the conductor plate is connected to a ground terminal of a circuit board to ground. It is disclosed to function as a plate.

Japanese Unexamined Patent Application Publication No. 2011-21929

Preferably, the conductor plate is securely fixed to the movement with a plurality of screws. Metal screws are usually used to fix the conductor plate. If the conductor plate and the ground of the circuit board are connected at multiple points via this screw, the current distribution will be dominant in the path far from the antenna feeding point where the current distribution is not concentrated due to impedance bias etc. , there is a risk that the current distribution will be biased and the reception sensitivity will decrease.

An electronic timepiece of the present disclosure includes an antenna for receiving radio waves, which includes an annular base material and an antenna element, a receiver for processing radio waves received by the antenna, a power supply terminal for feeding power to the antenna, and a ground terminal. a circuit board, a power supply member that electrically connects the antenna element and the power supply terminal, and a conductor arranged between the antenna and the circuit board in a side view viewed from a direction orthogonal to a central axis of the antenna. A plate, and a first fixing member and a second fixing member for fixing the conductive plate and the circuit board, wherein the first fixing member has, in a plan view seen from the direction of the central axis, The second fixing member is arranged at a position closer to the power supply member than the second fixing member, and fixes the conductor plate and the ground terminal in a conductive state, and the second fixing member connects the conductor plate and the ground terminal. It is characterized in that it is fixed in an insulated state.

1 is a schematic diagram showing an electronic timepiece according to a first embodiment of the invention; FIG. 1 is a plan view showing the electronic timepiece of the first embodiment; FIG. 1 is a cross-sectional view showing an electronic timepiece according to a first embodiment; FIG. 1 is an exploded perspective view showing essential parts of the electronic timepiece of the first embodiment; FIG. FIG. 2 is a plan view of the circuit board of the movement of the first embodiment as seen from the back cover side; FIG. 4 is a plan view of the circuit retainer of the movement of the first embodiment, viewed from the back cover side; FIG. 2 is a plan view of the conductor plate of the movement of the first embodiment as viewed from the cover glass side; FIG. 4 is a cross-sectional view showing a fixing structure by a first fixing member of the first embodiment; FIG. 4 is a cross-sectional view showing a fixing structure using a second fixing member according to the first embodiment; 1 is a perspective view showing an antenna of a first embodiment; FIG. 3 is an exploded perspective view showing the antenna and conductor plate of the first embodiment; FIG. 7 is a graph showing the relationship between the distance from the feeding point of the second conductive spring of the first embodiment and the relative antenna gain. FIG. 5 is a cross-sectional view showing an electronic timepiece according to a second embodiment; It is the top view which looked at the circuit holding|maintenance of the movement of 2nd Embodiment from the back cover side. It is a figure which shows the attachment structure of the antenna of a modification. It is a cross-sectional view showing a fixing structure by a third fixing member of a modification.

[First embodiment]
An electronic timepiece according to a first embodiment of the present disclosure will be described below with reference to the drawings.
1 is a schematic diagram showing an electronic timepiece 10, FIG. 2 is a plan view of the electronic timepiece 10 viewed from the surface side, FIG. 3 is a cross-sectional view showing an outline of the electronic timepiece 10, and FIG. 4 is an electronic timepiece. 10 is an exploded perspective view of the main part of FIG.
The electronic timepiece 10 of the present embodiment receives satellite signals from positioning information satellites S such as GPS satellites and quasi-zenith satellites orbiting the earth in a predetermined orbit to obtain satellite time information. It is a wristwatch that corrects internal time information. GPS is an abbreviation for Global Positioning System. A GPS satellite is a navigation satellite that orbits the earth in a predetermined orbit, and superimposes a navigation message on a radio wave of 1.57542 GHz and transmits it to the ground. In the following description, the 1.57542 GHz radio wave on which the navigation message is superimposed will be referred to as a satellite signal. The satellite signal is circularly polarized with right hand polarization.

The electronic timepiece 10 includes an exterior case 30, a cover glass 33, and a metal back cover 34, as shown in FIGS. The exterior case 30 is constructed by fitting a metal bezel 32 to a metal cylindrical case body 31 . In the following description, for each component of the electronic timepiece 10, the cover glass 33 side is defined as the front surface or top surface, and the back cover 34 side is defined as the back surface or bottom surface.
On the side surface of the exterior case 30, the A button 17A is provided at the 8 o'clock position with respect to the plane center of the dial 11, the B button 17B is provided at the 10 o'clock position, and the B button 17B is provided at the 2 o'clock position. A C button 17C is provided, a D button 17D is provided at the 4 o'clock position, and a crown 14 is provided at the 3 o'clock position.

Inside the exterior case 30, as shown in FIGS. 3 and 4, there are a dial ring 40 attached to the inner periphery of the bezel 32, an antenna 200, a light-transmissive dial 11, hands 21 and 22. , 23, 71, 81, 91, a solar panel 50, a ring-shaped calendar wheel 16, a conductor plate 160, a main plate 100, a circuit board 120, a magnetic shield plate 170, a circuit retainer 122, and a drive mechanism 140. and are placed.
A pointer shaft 25 is arranged in the plane center of the dial 11 . The pointer shaft 25 has triple pointer shafts 25A, 25B, and 25C. The pointer shafts 25A, 25B, 25C pass through the plane center of the dial 11 and are provided along the front and back directions, ie, along the thickness direction of the electronic timepiece 10, and the pointers 21, 22, 23 are attached.

The dial 11 is provided with a circular first small window 70 and a pointer 71 in the 2 o'clock direction with respect to the center of the plane, and a circular second small window 80 and a circular pointer 81 in the 10 o'clock direction. A circular third small window 90 and hands 91 are provided in the 6 o'clock direction, and a rectangular calendar small window 15 is provided in the 4 o'clock direction. The dial 11, the hands 21, 22, 23, the first small window 70, the second small window 80, the third small window 90, the calendar small window 15, etc. are seen through the cover glass 33 attached to the opening of the bezel 32. and is visible.

The dial 11 is a circular plate that displays the time inside the exterior case 30, is made of a light-transmitting synthetic resin material, and has pointers 21, 22, 23, etc. between it and the cover glass 33. , are arranged inside the dial ring 40 . The dial 11 of this embodiment is made of polycarbonate.
A solar panel 50 for photovoltaic power generation is arranged on the rear surface of the dial 11 . The solar panel 50, as also shown in FIG. 4, is a circular flat plate in which a plurality of solar cells that convert light energy into electrical energy are connected in series.
The dial 11 and the solar panel 50 are arranged in an overlapping manner, and the outer circumference thereof is arranged on the lower surface of the inner circumference of the dial ring 40 as shown in FIG. That is, the dial ring 40 covers the outer edges of the dial 11 and the solar panel 50 . Therefore, the dial ring 40 functions as a parting member that cuts off the outer periphery of the dial 11 , and the diameter of the inner peripheral opening of the dial ring 40 is the parting diameter of the dial 11 .
The dial 11 and the solar panel 50 are formed with holes through which the pointer shafts 25A, 25B, 25C, the pointer shaft 26 of the pointer 71, the pointer shaft 27 of the pointer 81, and the pointer shaft 28 of the pointer 91 penetrate. In addition, an opening for a small calendar window 15 is formed.
A calendar wheel 16 and a date wheel 29 attached to a shaft 29A are arranged on the back side of the solar panel 50. - 特許庁The calendar wheel 16 can be visually recognized from the small calendar window 15.例文帳に追加

A conductor plate 160 is arranged on the back side of the calendar wheel 16 , and a main plate 100 is arranged on the back side of the conductor plate 160 . The ground plate 100 is made of a synthetic resin material, and has a through hole 105 in which the antenna feeding pin 240 is arranged.

5 and 6 are plan views showing the movement as seen from the back cover side, FIG. 7 is a plan view showing the movement as seen from the cover glass side, and FIGS. 8 and 9 are sectional views of the essential parts of the movement. is. 5 is a plan view showing the circuit board 120 exposed by removing the antimagnetic plate 170 and the circuit holder 122, and FIG. 6 is a plan view showing the state where the antimagnetic plate 170 and the circuit holder 122 are attached. FIG. 7 is a plan view showing a state in which the dial 11, the solar panel 50, and the calendar wheel 16 are removed to expose the conductor plate 160. FIG. 8 and 9 are sectional views showing the fixing structure of the motor, in which the circuit holder 122 arranged closer to the back cover 34 than the motors 141 to 145 is placed on the upper side, and the dial 11 is placed on the lower side.
A drive mechanism 140 is attached to the base plate 100 and covered with a circuit board 120 from the back side. The drive mechanism 140 has a step motor and a wheel train such as gears. In this embodiment, a first motor 141 that drives the pointer 81 that is the second hand, a second motor 142 that drives the pointer 22 that is the minute hand and the pointer 23 that is the hour hand, and the pointer 21 that is the chronograph second hand and the chronograph minute hand. , a fourth motor 144 that drives a pointer 91 that serves both as an indicator hand and a chronograph hour hand, and a fifth motor 145 that drives the calendar wheel 16 .
The configuration of each of the motors 141 to 145 will be described using the second motor 142 as an example. As shown in FIGS. 5 and 9, the second motor 142 is a step motor including a coil 152 wound around a core 151, a stator 153, and a rotor 154. The second motor 142 further includes a substrate seat 155 superimposed on the core 151 and a motor substrate 156 to which the coil 152 is electrically connected. Other motors 141, 143, 144, and 145 have similar configurations. The ground plate 100 and the conductor plate 160 are formed with holes through which the pointer shafts 25A, 25B, 25C, 26, 27, 28 and the shaft 29A driven by the motors 141-145 pass.
The dial 11 and hands 22, 23, and 81, which are at least hour, minute, and second hands, constitute a time display unit for displaying the time.

The circuit board 120 arranged on the back side of the main board 100 includes a GPS receiver 300 and a control display 400, as shown in FIGS. Further, the circuit board 120 is formed with openings in which the motor coils of the motors 141 to 145 are arranged and cutouts in which the secondary battery 130 is arranged. Further, on the surface of the circuit board 120, as shown in FIGS. 3 and 4, a feeding terminal 121 is formed with which an antenna feeding pin 240, which is a feeding member, abuts.
The GPS receiving section 300 and the control display section 400 are composed of integrated circuits and attached to the back surface of the circuit board 120 . The secondary battery 130 is composed of a lithium ion battery or the like, and is charged with power generated by the solar panel 50 .

A circuit holder 122 is provided on the back side of the circuit board 120 with a magnetic shield plate 170 interposed therebetween. The circuit retainer 122 is made of a metal plate and, as shown in FIG. and screwed to the base plate 100 . That is, the first conductive spring 123 is formed integrally with the circuit retainer 122 . A ground terminal 125 is formed on the rear surface of the circuit board 120 to contact the fixing piece 124 of the circuit retainer 122 as shown in FIG.
As a result, the ground pattern of the circuit board 120 is electrically connected to the metal back cover 34 via the ground terminal 125 , the fixing piece 124 of the circuit retainer 122 and the first conductive spring 123 .
The antimagnetic plate 170 and the circuit retainer 122 are formed in a shape that does not overlap the secondary battery 130 in plan view, and by removing the back cover 34, the secondary battery 130 can be replaced without removing the circuit retainer 122 and the antimagnetic plate 170. . Here, "planar view" means a state viewed from a direction along the pointer shaft 25, that is, a first direction perpendicular to the surface of the dial 11. As shown in FIG. A side view means a state viewed from a second direction perpendicular to the first direction.

[Conductor plate]
As shown in FIG. 4, the conductor plate 160 is arranged on the dial 11 side of the main plate 100, specifically between the calendar wheel 16 and the main plate 100, and is a cylinder that holds down the hour wheel to which the pointer 23, which is the hour hand, is attached. It's a car hold. As shown in FIG. 7, the conductor plate 160 includes a plate-like portion 161 formed in a substantially disc shape covering substantially the entire surface of the ground plate 100 and an extension portion 162 extending from the outer periphery of the plate-like portion 161. and a conductive metal plate. Furthermore, the conductor plate 160 is configured to overlap the motors 141 to 145 of the drive mechanism 140 in plan view, and also functions as a magnetic shield. That is, since the conductor plate 160 is made of metal, it also functions as an anti-magnetic plate that prevents the motors 141 to 145 from malfunctioning under the influence of an external magnetic field.
The plate-like portion 161 is screwed to the base plate 100 and the circuit board 120 at a plurality of locations, and is electrically connected or conducted to the ground terminal 125 of the circuit board 120 with some of the screws. Further, the plate-like portion 161 is formed with a hole in which the needle shaft 25, the needle shafts 26, 27, and 28, the shaft 29A of the date indicator wheel 29 is arranged, and a hole 165 in which the antenna feed pin 240 is arranged. It is
The extending portions 162 extend from a plurality of locations, for example, four locations on the outer periphery of the plate-like portion 161 . A hook portion 163 extending upward is provided at the outer peripheral end portion of the extending portion 162 . A conductive spring portion 164 is formed on the extending portion 162 obliquely upward by cutting and raising.

Here, the fixing structure of the conductor plate 160, the motors 141 to 145, the circuit board 120, and the circuit holder 122 will be described with reference to FIGS. 5 to 9. FIG.
As shown in FIGS. 8 and 9, the base plate 100 is formed with through holes 106 for inserting screws at a plurality of locations, and the openings of the through holes 106 on the surface side are formed with stepped portions 106A.
In this embodiment, the conductor plate 160 is fixed to the base plate 100 at a plurality of locations by the first fixing members 180A and the second fixing members 180B arranged in the through holes 106 .
As shown in FIG. 8, the first fixing member 180A fixes the conductive plate 160 and the ground terminal 125 of the circuit board 120 in a conductive state, and the second fixing member 180B is shown in FIG. Thus, the conductor plate 160 and the ground terminal 125 of the circuit board 120 are fixed in an insulated state, ie, in a non-conducting state in which electricity does not flow.

As shown in FIG. 8, the first fixing member 180A includes conductive screw pins 181A and screws 191A and 192A. It also serves as a fixing member to be fixed between the circuit boards 120 .
The screw pin 181A is a pipe member made of metal and arranged in the through hole 106 of the base plate 100 . A flange 182A is formed on one end side of the screw pin 181A. The flange 182A is engaged with the stepped portion 106A of the through hole 106 of the base plate 100. As shown in FIG.
Stator 153 , core 151 , substrate seat 155 , and motor substrate 156 are formed with through holes, and screw pins 181 A protruding from the back surface of base plate 100 are inserted into these through holes.
A metal screw 191A is screwed from the conductive plate 160 side to one end of the screw pin 181A. A metal screw 192A is screwed to the other end of the screw pin 181A. In this embodiment, the screw 192A for fixing the third motor 143 is screwed onto the screw pin 181A with the head of the screw 192A directly abutting the ground terminal 125 of the circuit board 120. FIG.
Thereby, the conductor plate 160, the ground plate 100, the third motor 143, and the circuit board 120 are sandwiched and fixed by two screws 191A and 192A screwed into the screw pins 181A.
A ground terminal 125 is formed on the circuit board 120 with which the screw 192A abuts. The metal conductor plate 160 is in contact with the screw 191A and the flange 182A of the screw pin 181A. Further, metal screws 191A and 192A are screwed into the metal screw pin 181A. Therefore, the first fixing member 180A fixes the conductive plate 160 and the ground terminal 125 of the circuit board 120 in a conductive state.

The second fixing member 180B includes a screw pin 181B, screws 191B and 192B, and a spacer 193, as shown in FIG. , the fourth motor 144 and the fifth motor 145 between the base plate 100 and the circuit board 120. FIG. 9 illustrates the fixing structure of the second motor 142 .
Like the screw pin 181A, the screw pin 181B is a metal pipe member, and has a flange 182B formed on one end side. However, the thickness of the flange 182B is made thinner than that of the flange 182A, and when the flange 182B is engaged with the stepped portion 106A of the through hole 106, a gap is secured between the flange 182B and the conductor plate 160 so as to be in a non-contact state. is configured as
A synthetic resin spacer 193 is arranged between the head of the screw 191B and the conductor plate 160 . The hole through which the screw 191B of the conductor plate 160 is inserted has a hole diameter larger than the threaded portion of the screw 191B. Therefore, the screw 191B is screwed into the screw pin 181B through the spacer 193 and the hole of the conductor plate 160 without contacting the conductor plate 160 .
The screw 192B is screwed into the screw pin 181B via a notch formed in the circuit board 120 and a fixing piece 124 provided by bending the circuit retainer 122, as shown in FIG.
The other first motor 141, fourth motor 144, and fifth motor 145 are fixed by the second fixing member 180B so that the conductive plate 160 and the ground terminal 125 are not electrically connected, like the second motor 142. .
As shown in FIGS. 8 and 9, a calendar retainer 18 is arranged between the conductor plate 160 and the solar panel 50 to restrict movement of the calendar wheel 16 toward the dial 11 side. This calendar presser 18 is fixed to the base plate 100 via a conductor plate 160 . In addition, a through hole 18A having a diameter larger than that of the spacer 193 is formed in a portion of the calendar retainer 18 that overlaps the screw 191B in plan view, and the spacer 193 and the head of the screw 191B are arranged.

Each motor 141 to 145 of the drive mechanism 140 is sandwiched between a conductor plate 160 and a magnetic shield plate 170. As shown in FIG. In recent years, high-performance magnets have come to be used in many cases for mobile terminals such as smartphones, and anti-magnetism is also required for wristwatches. For this reason, in order to detour the external magnetic field and prevent the stepping motor from malfunctioning, the conductor plate 160 and the anti-magnetic plate 170 made of a high magnetic permeability material such as pure iron are placed at positions overlapping the motors 141 to 145 in plan view. are placed in
Of the motors 141 to 145, the coil 152 is less likely to be affected by an external magnetic field, so it does not necessarily have to overlap the conductor plate 160 and the magnetic shield plate 170 two-dimensionally. Therefore, it is preferable that the conductor plate 160 and the anti-magnetic plate 170 planarly overlap at least a part of each of the motors 141 to 145 , particularly the stator 153 and the rotor 154 .
Also, in the present embodiment, two anti-magnetic plates, the conductor plate 160 and the anti-magnetic plate 170, are provided, but only the conductor plate 160 may be provided. However, sandwiching the motors 141 to 145 between the conductor plate 160 and the antimagnetic plate 170 can improve the antimagnetic performance.

As shown in FIGS. 3 and 4, the anti-magnetic plate 170 is arranged between the circuit board 120 and the circuit holder 122, has a planar shape similar to that of the circuit holder 122, and overlaps the motors 141 to 145 in plan view. It has a shape that does not overlap with the secondary battery 130 . The antimagnetic plate 170 is screwed to the base plate 100 .

The dial ring 40 is made of a ring-shaped synthetic resin material having a flat portion 41 and an inclined portion 42 .
The flat plate portion 41 is provided parallel to the cover glass 33 , and the upper surface of the outer peripheral end is in contact with the lower surface of the inner periphery of the bezel 32 . The inclined portion 42 extends from the flat plate portion 41 and contacts the dial 11 at its inner peripheral end. The surface of the inclined portion 42 , that is, the inner peripheral surface of the dial ring 40 is inclined toward the back surface of the electronic timepiece 10 , that is, downward, from the upper end connected to the flat plate portion 41 to the lower end that contacts the dial 11 . Therefore, the inner peripheral surface of the dial ring 40 becomes smaller in height relative to the dial 11 toward the inner side of the electronic timepiece 10, and the dial 11 can be viewed over a wide range of angles.

A doughnut-shaped storage space is formed by the dial ring 40 and the bezel 32, and the antenna 200 is stored in this storage space.
Since dial ring 40 is made of a non-conductive material such as synthetic resin, it does not interfere with reception of radio waves by antenna 200 . In addition, since the dial ring 40 covers the antenna 200, the antenna 200 is hidden, and the appearance of the electronic timepiece 10 is prevented from being uncomfortable, and the design of the electronic timepiece 10 can be improved.

The electronic timepiece 10 has a GPS receiver section 300 and a control display section 400 arranged on the circuit board 120 .
The GPS receiver 300 is a receiver that receives and processes satellite signals from GPS satellites using the GPS antenna 200, and since it is used in an electronic timepiece that receives satellite signals, a description thereof will be omitted. GPS receiver 300 outputs positioning data and time data acquired based on the received satellite signals to control display unit 400 .

The control display unit 400 includes a control unit, a drive circuit for driving hands and the like, and a crystal oscillator. In addition, the drive circuit controls the movement of hands 22, 23, 81. GPS receiver 300 and control display 400 operate on the power of secondary battery 130 .

[Antenna configuration]
10 is a schematic perspective view showing antenna 200, and FIG. 11 is a schematic perspective view showing antenna 200 and conductor plate 160. FIG.
The antenna 200, which is an antenna for receiving GPS satellite signals, has an antenna element 220 formed on an antenna substrate 210, which is an annular substrate made of dielectric material, by plating, silver paste printing, or the like.
The antenna substrate 210 of this embodiment is formed with an arcuate concave portion 217 for avoiding interference with the buttons 17A to 17D. In addition, a plurality of concave portions 218 are formed on the inner peripheral surface of the antenna base 210 to prevent interference with the fixing portion of the solar panel 50 and the dial 11 . In the conductor plate 160 shown in FIG. 11, illustration of holes through which the pointer shafts are inserted and holes in which screws are arranged is omitted.

Next, the configuration of the antenna substrate 210 will be described. In this embodiment, the central axis direction of the annular antenna base 210 coincides with the axial direction of the pointer shaft 25, that is, the thickness direction of the electronic timepiece 10, and the direction of the plan view of the electronic timepiece 10, that is, the dial plate. corresponds to a first direction orthogonal to the surface of 11; In addition, in the thickness direction of the electronic timepiece 10, the front side of the electronic timepiece 10 is defined as the upper side, and the back side thereof is defined as the lower side.
Antenna base 210 includes an upper surface 211 , an outer peripheral surface 212 , a lower surface 213 and an inner peripheral surface 214 . Inner peripheral surface 214 includes a first inner peripheral surface 215 continuous with upper surface 211 and a second inner peripheral surface 216 provided between first inner peripheral surface 215 and lower surface 213 . For this reason, the antenna base 210 has a pentagonal cross section.

As the dielectric that forms the antenna base 210, a ceramic dielectric material that can be used at high frequencies, such as titanium oxide, is mixed with a synthetic resin and molded.
PPS (Poly Phenylene Sulfide), LCP (Liquid Crystal Polymer), and polycarbonate are preferable for the base resin material of the dielectric because they are easily electroless plated. Accordingly, the antenna 200 can be further miniaturized together with the wavelength shortening of the dielectric.
That is, the frequency of radio waves from GPS satellites is about 1.575 GHz, and one wavelength is about 19 cm. In order to receive circularly polarized waves, an antenna length of about 1.0 to 1.2 times the wavelength is required, so a loop antenna with a length of about 19 to 24 cm is required to receive radio waves from GPS satellites. necessary. When a loop antenna with such an antenna length is housed inside a wristwatch, the wristwatch becomes large.
On the other hand, in this embodiment, the antenna 200 has a ring-shaped antenna base 210 made of a dielectric having a dielectric constant εr of about 7-15. Here, when using the antenna substrate 210 having a dielectric constant εr, the wavelength shortening rate of the antenna substrate 210 is generally (εr) ^−1/2 . The dielectric constant εr is about 7 to 15, and the antenna length can be shortened due to the wavelength shortening effect compared to the case where the antenna substrate 210 with such a high dielectric constant is not provided. It can be miniaturized to a size that can be stored.

The electroless plating forming the antenna element 220 is made of copper, nickel, and gold, and the thickness of the plating is as thin as about ten and several μm. Therefore, in order to reduce the resistance value of the antenna element 220, the width of the antenna element 220 needs to be about 0.5 mm or more.
Here, as described above, the antenna substrate 210 of the antenna 200 of the present embodiment has a pentagonal cross section, and the width dimension of the upper surface 211 is small. The width of the element 220 is narrowed, the resistance value is increased, and the antenna gain is reduced due to an increase in loss.
Therefore, in this embodiment, the ground element 221 is formed on the outer peripheral surface 212 of the antenna substrate 210 and the feeding element 225 is formed on the inner peripheral surface 214 thereof.

The ground element 221 is formed on the outer peripheral surface 212 of the antenna substrate 210, and is formed in a C-shape in which a part of the ring is cut off when the antenna 200 is viewed from the surface of the electronic timepiece 10 in a plan view. The ground element 221 has an antenna length that resonates with radio waves from GPS satellites, that is, satellite signals. Furthermore, the ground element 221 extends from the outer peripheral surface 212 to the lower surface 213 at a portion of the antenna substrate 210 in the circumferential direction, specifically, at a portion that abuts on the conductive spring portion 164 of the conductor plate 160 . . Therefore, the ground element 221 is electrically connected to the conductor plate 160 functioning as a ground plate via the conduction spring portion 164 .

The feeding element 225 is an arc-shaped element formed on the inner peripheral surface 214 of the antenna substrate 210, and has a first inner peripheral portion 225A formed on the first inner peripheral surface 215 and a and a formed second inner peripheral portion 225B. Further, the feeding element 225 has a feeding terminal formed on the lower surface 213 at a part of the antenna substrate 210 in the circumferential direction, which is approximately 12 o'clock in this embodiment.
The feed element 225 is an element also called an excitation element that is electrically fed to the feed terminal 121 of the circuit board 120 by means of the antenna feed pin 240 provided through the hole 165 of the conductor plate 160 and the through hole 105 of the ground plate 100 . be. By appropriately setting the length of the feeding element 225 , it is possible to match the impedance of the GPS receiving section 300 electrically connected to the antenna 200 and the impedance of the antenna 200 .

In this embodiment, the angular range of the ground element 221 in the circumferential direction is set within a range from 170 degrees to 330 degrees, for example. In addition, the angular range of the feeding element 225 in the circumferential direction is set, for example, within the range of 40 degrees to 160 degrees. As a result, the feeding element 225, which is the feeding element of the antenna 200, becomes substantially C-shaped in plan view, and the antenna 200 functions as a C-shaped ring antenna for receiving circularly polarized radio waves.

Next, a mounting structure for the antenna 200 will be described with reference to FIG.
An outer peripheral surface 212 of the antenna 200 is formed with recesses 212A at a plurality of locations, specifically at four locations, and eave-like protrusions 219 are formed in the recesses 212A. The outer peripheral surface of the protruding portion 219 is formed as an inclined surface that protrudes outward from the lower surface 213 of the antenna 200 as it goes upward.
A hook portion 163 extending upward is provided at the outer peripheral end portion of the extending portion 162 of the conductor plate 160 , and a through hole 163 A that engages with the projecting portion 219 is formed in the hook portion 163 . A conductive spring portion 164 is formed on the extending portion 162 obliquely upward by cutting and raising.

The conductor plate 160 is fixed to the base plate 100 with screws and is made of elastic metal. Therefore, when the antenna 200 is moved toward the ground plane 100 , the conductor plate 160 bends outward along the inclined surface of the projecting portion 219 , and then the through hole 163A engages the projecting portion 219 . The antenna 200 is thus attached to the conductor plate 160 . Also, the conductive spring portion 164 contacts the ground element 221 on the lower surface 213 of the antenna 200 . As a result, the ground element 221 is electrically connected to the conductor plate 160 via the four conductive spring portions 164 . By electrically connecting the ground element 221 and the conductor plate 160 at a plurality of points in this manner, the potential difference between the ground element 221 and the conductor plate 160, that is, the ground plane, is reduced, and the effect of the ground plane is increased. Become.
Also, the conductor plate 160 is sized to overlap the antenna 200 in plan view. Therefore, by using the conductor plate 160 as a ground plane and electrically connecting it to the ground element 221 provided in the antenna 200, the area of the ground plane can be increased, the impedance of the ground plane can be lowered, and the antenna performance can be improved. . Note that the conductor plate 160 only needs to be arranged between the antenna 200 and the circuit board 120 in a side view, and does not necessarily have to overlap the antenna 200 in a plan view. For example, the conductor plate 160 may be formed to have a planar size that fits inside the antenna 200 .
Also, the ground terminal 125 of the circuit board 120 is electrically connected to the rear cover 34 via the first conduction spring 123 of the circuit retainer 122 . Therefore, the metal back cover 34 and the metal exterior case 30 to which the back cover 34 is attached are connected to the ground potential. Therefore, in this embodiment, in addition to the conductor plate 160, the exterior case 30 and the back cover 34 can be used as a ground plane, and the area of the ground plane can be maximized to improve the antenna performance.

After attaching the antenna 200 , the solar panel 50 and the dial 11 are attached to the inner peripheral side of the antenna 200 . As for the mounting structure of the solar panel 50 and the dial plate 11, the same structure as the conventional one can be adopted. For example, by arranging a fixing projection formed on the base plate 100 in the concave portion 218 of the antenna 200 and engaging grooves formed on the outer peripheral edge of the solar panel 50 and the dial plate 11, the solar panel 50 and the dial plate 11 can be fixed. It may be fixed to the base plate 100 . Further, the dial ring 40 may be fixed to the main plate 100 by fitting a fixing pin or the like formed in the main plate 100 into a hole (not shown) formed in the dial ring 40 .

As described above, the antenna 200 is arranged around the outer periphery of the dial 11, that is, around the time display portion, is arranged inside the bezel 32, and is further covered with the dial ring 40 and the cover glass 33 made of synthetic resin. , it is possible to ensure good reception.
The antenna 200 is fed with power through a feed terminal provided on the lower surface 213 of the antenna 200, and as shown in FIG. Antenna feed pin 240 is a pin-shaped connector made of metal, is disposed through conductor plate 160 and ground plate 100 , and abuts feed terminal 121 of circuit board 120 . Thereby, the feeding terminal 121 of the circuit board 120 and the feeding element 225 of the antenna 200 are electrically connected via the antenna feeding pin 240 .

Next, the arrangement positions of the first fixing member 180A and the second fixing member 180B and the formation position of the first conduction spring 123, which affect the characteristics of the antenna 200, will be described.
In this embodiment, in the conductor plate 160, the position of the feeding point of the antenna 200 in plan view, that is, the position of the hole 165 in which the antenna feed pin 240, which is the feeding member, is arranged is used as a reference, and in the plan view of the conductor plate 160, A first fixing member 180A is used at a position near the hole 165, and a second fixing member 180B is used at a position away from the feeding point.
Specifically, as shown in FIG. 7, the first fixing member 180A is arranged in the first range 166, and the second fixing member 180B is arranged outside the first range 166. As shown in FIG. The first range 166 is +90° to -90° in the outer peripheral direction of the watch, centered on a line 166A that connects the position of the antenna feed pin 240, that is, the position of the hole 165, and the plane center position of the watch, that is, the position of the pointer shaft 25. is a fan-shaped range of . That is, the first range 166 is a semicircular area surrounded by a straight line 167 that passes through the pointer shaft 25 and is perpendicular to the line 166A, and an arc along the outer periphery of the conductor plate 160. As shown in FIG. This first range 166 substantially coincides with a region where at least one of the electric field strength and the magnetic field strength on the conductor plate 160 has the maximum value. On the other hand, the region outside the first range 166 is a region in which at least one of the electric field strength and the magnetic field strength in the conductor plate 160 is 3 dB or more smaller than the maximum value.
A first fixing member 180A for fixing the conductor plate 160 and the ground terminal 125 in a conducting state is arranged only within the first range 166, and outside the first range 166, the second fixing member 180B is used to fix the conductor. By fixing the plate 160 and the ground terminal 125 in a non-conducting state, the receiving sensitivity can be improved by 3 dB compared to the case where the first fixing member 180A is used to fix the outside of the first range 166. .
That is, in order to securely fix the conductor plate 160 to the movement, it is preferable to fix the conductor plate 160 to the main plate 100 at a plurality of locations. A conductive screw made of metal or the like is used to fix the conductor plate 160, because it is possible to improve the movement assemblability and fixing strength, and to enable disassembly and repair. When the conductor plate 160 and the ground terminal 125 of the circuit board 120 are connected at a plurality of locations via conductive screws, a phenomenon occurs in which the reception sensitivity is lowered.
According to the inventor's analysis of this phenomenon, when the current distribution is dominant from the path where the current distribution is not concentrated, that is, the path far from the feeding point, the current distribution is biased and the reception sensitivity is reduced. found to decrease.
In order to suppress this decrease in reception sensitivity, it is necessary to eliminate the bias in the current distribution. Therefore, when the distribution of the electric field strength and the magnetic field strength in the conductor plate 160 was simulated, the strength was high in the region near the feeding point, and the strength decreased away from the feeding point. It has been found that the receiving sensitivity is lowered if the conductive plate 160 and the ground terminal 125 are electrically connected in a region where at least one of them is 3 dB or more smaller than the maximum value. In the case of the electronic timepiece 10, which is a wristwatch, the area where the maximum value is decreased by 3 dB or more substantially coincides with the area outside the first range 166. FIG. Therefore, by providing a conductive path between the conductor plate 160 and the ground terminal 125 only where the current distribution is concentrated, that is, only at a position within the first range 166 near the feeding point, the current can be effectively distributed. It was possible to suppress the decrease in reception sensitivity.

Furthermore, regarding the first conduction spring 123 of the circuit board 120 that connects the ground terminal 125 of the circuit board 120 and the back cover 34, it is better to provide it at a position closer to the power supply point than to provide it at a position farther from the power supply point. Receiving sensitivity is improved compared to The graph shown in FIG. 12 is a graph showing the relationship between the distance from the feeding point of the first conductive spring 123 and the relative antenna gain. As can be seen from this graph, the relative antenna gain decreases when the distance from the feeding point exceeds 15 mm. Therefore, the planar distance of the first conductive spring 123 from the antenna feeding pin 240, which is a feeding member, in a plan view is within the first threshold set according to the relative antenna gain, and within 15 mm in this embodiment. position.
Here, in the wristwatch-sized electronic timepiece 10, the length from the feeding point to the center of the timepiece is about 13 mm. Therefore, as shown in FIG. 6, +60° in the outer peripheral direction of the electronic timepiece 10 is centered on a line 126A that connects the position of the power supply terminal 121 matching the position of the power supply point of the antenna 200 in plan view and the center of the timepiece. If the first conductive spring 123 is provided within the fan-shaped second range 126 of ~-60°, the first conductive spring 123 can be arranged at a position within 15 mm, which is the first threshold value, from the feeding point.
Further, as a result of experiments, 1 to 2 locations are optimal for the placement locations of the first conduction springs 123 within the second range 126, and the number of locations where the first conduction springs 123 are arranged is 0 or 3 or more. The relative antenna gain was improved compared to the case where the
Furthermore, the antenna gain when the first conduction spring 123 is provided only at one or two locations within the second range 126, and the difference between the two locations within the second range 126 and the three locations outside the second range 126 Comparing the antenna gain when the first conductive springs 123 are provided at a total of five locations by simulation, the antenna gain when the first conductive springs 123 are provided only within the second range 126 improves by about 7 dBic. was gotten.

[Action and effect of the embodiment]
According to this embodiment, since the conductor plate 160 is fixed to the main plate 100 at a plurality of locations using the first fixing member 180A and the second fixing member 180B, the conductor plate 160 can be reliably fixed to the movement. .
In addition, the first fixing member 180A that fixes the conductive plate 160 and the ground terminal 125 of the circuit board 120 in a conductive state is provided only at one location near the feeding point of the antenna 200, and the conductive plate 160 and the ground terminal 125 and are fixed by the second fixing member 180B that fixes them in an insulated state. Therefore, it is possible to effectively disperse the current around the feeding point where the current distribution concentrates, thereby improving the receiving sensitivity of the antenna 200. be able to.

Further, the region outside the first range 166 where the second fixing member 180B is arranged is a region where at least one of the electric field strength and the magnetic field strength in the conductor plate 160 is 3 dB or more smaller than the maximum value. The disposed second fixing member 180B fixes the conductor plate 160 and the ground terminal 125 in a non-contact state, so that the reception sensitivity of the antenna 200 can be prevented from deteriorating.

Further, the first fixing member 180A is arranged in a fan-shaped first range 166 of +90° to -90° in the outer peripheral direction of the watch centered on a line 166A connecting the antenna feed pin 240 and the center of the watch in plan view. Therefore, the receiving sensitivity of the antenna 200 can be improved.
Further, since the first range 166 can be set once the position of the feeding point of the antenna 200 is determined, there is no need to set the first range 166 by obtaining the electric field strength and the magnetic field strength by simulation or the like. can be easily designed.
Furthermore, since the first range 166 is set to approximately half the area of the conductor plate 160, the range in which the first fixing member 180A can be arranged is relatively wide, and can be easily set according to the arrangement position of the motor.

In the second fixing member 180B, a resin spacer 193 is sandwiched between the head of the screw 191B and the conductor plate 160 for insulation, so that a non-conducting state can be realized even if the conductive screw 191B is used. .
Furthermore, since the thickness of the flange 182B of the screw pin 181B is made thin so that it does not come into contact with the conductor plate 160, a non-conducting state can be realized even if the conductive screw pin 181B is used.
Therefore, by screwing the metal screws 191B and 192B onto the metal screw pins 181B, the conductor plate 160 and the circuit board 120 can be firmly fixed in an insulated state.

Since the conductor plate 160 can also serve as an hour wheel retainer and a magnetic shield plate, the number of parts can be reduced.
Further, by bringing the conductive spring portion 164 of the metal conductor plate 160 into contact with the ground element 221, the conductor plate 160 is used as a ground plane, so that the antenna characteristics can be further improved. Furthermore, the conductor plate 160 is provided with an antimagnetic function to prevent the motors 141 to 145 from malfunctioning under the influence of an external magnetic field, and a function to hold down the hour wheel to which the hour hand, which is the pointer 23, is attached. Since this is an existing part of the timepiece and uses this existing part as the ground plane, there is no need to use a new part for the ground plane, and an increase in the number of parts can be suppressed.
Furthermore, in the case of an unbalanced feeding antenna that requires a ground plane, the conductive plate 160, which serves as a retainer for the hour wheel, can be used to form a large ground plane.

A first conductive spring 123 is provided to electrically connect the metal back cover 34 and the ground terminal 125 of the circuit board 120, and the first conductive spring 123 has a planar distance from the feeding point at a first threshold in plan view. Since they are arranged within a certain 15 mm distance, current distribution can be effectively achieved around the feeding point where current distribution concentrates, and the receiving sensitivity of the antenna 200 can be improved.

The first conduction spring 123 is arranged in a fan-shaped second range 126 extending from +60° to -60° in the outer peripheral direction of the electronic timepiece 10 about a line 126A connecting the feeding point of the antenna 200, that is, the antenna feeding pin 240, and the center of the clock. , the planar distance from the feeding point can be arranged within the first threshold in plan view, and current distribution can be effectively achieved around the feeding point where the current distribution concentrates, and the reception of the antenna 200 can be achieved. Sensitivity can be improved.
Furthermore, since the first conduction spring 123 is formed integrally with the circuit retainer 122, the first conduction spring 123 does not need to be constructed as a separate part, and the number of parts can be reduced.

Since the ground terminal 125 of the circuit board 120 and the conductor plate 160 are electrically connected by the conductive spring portions 164 provided at a plurality of locations, the ground element 221 of the antenna 200 is connected to the circuit board 120 via the conductor plate 160 . can be electrically connected to the ground terminal 125, and the effect of the ground plane can be improved. Further, since the ground element 221 of the antenna 200 and the ground terminal 125 of the circuit board 120 are arranged with the ground plane 100 and the drive mechanism 140 interposed therebetween, it is structurally difficult to directly connect them, but the conductor plate 160 is connected to the circuit board. As with 120, the plane size is large, so it is possible to avoid interference with the gear train and motors 141 to 145, etc., and conduct electricity easily. Miniaturization can also be achieved.
Moreover, in the above-described embodiment, the first fixing member 180A that electrically connects the conductor plate 160 and the ground terminal 125 of the circuit board 120 is used to fix the conductor plate 160, the third motor 143, and the circuit board 120 to the ground plane 100. Since it is also used for both, the number of parts can be reduced and the movement can be miniaturized as compared with the case of separately providing a pin or the like for electrical connection between the conductor plate 160 and the circuit board 120 .

Since the conductor plate 160 overlaps the antenna 200 in plan view, it can be configured to have a diameter size approximately equal to that of the antenna 200 . Therefore, the size of the conductor plate 160 used as the ground plane can be increased, and the antenna performance can be improved.
Further, since the ground element 221 of the antenna 200 and the conductor plate 160 are electrically connected at a plurality of locations, the potential difference between the ground element 221 and the conductor plate 160 can be reduced compared to the case where the electrical connection is at one location. It can improve the effect as

In the antenna 200, the feeding element 225 is formed on the first inner peripheral surface 215 and arranged closer to the center of the ground plane than the ground element 221, so that the effect of the ground plane can be improved.
Since the ground element 221 is formed on the bottom surface 213 of the antenna substrate 210 , it can be easily connected to the conductor plate 160 . Further, since the ground element 221 is also formed on the outer peripheral surface 212 of the antenna substrate 210, the area of the ground element 221 can be secured. Therefore, by reducing the width of the antenna 200, the parting diameter of the dial 11 arranged on the inner peripheral side of the ring-shaped antenna 200 can be increased, and the antenna performance can be improved.
In addition to the conductive plate 160, the external case 30 and back cover 34 of the electronic timepiece 10 can function as a ground plane, so the size of the ground plane can be maximized and the antenna performance can be improved.

The antenna 200 is attached to the ground plane 100 via the conductor plate 160 by forming the projection 219 on the antenna 200, forming the hook 163 on the conductor plate 160, and engaging the projection 219 and the hook 163. can be done. Therefore, compared to the case where the antenna 200 is screwed, it can be assembled more easily, the assembling workability of the electronic timepiece 10 can be improved, and the manufacturing cost can be reduced.
Since the antenna 200 is covered with the dial ring 40 made of synthetic resin, the design can be improved without impairing the performance of the antenna. Moreover, since the bezel 32 made of metal is used, the appearance of the electronic timepiece 10 can be improved, and the sense of quality can be enhanced.

[Second embodiment]
An electronic timepiece 10B according to a second embodiment will be described with reference to FIGS. 13 and 14. FIG. FIG. 13 is a schematic cross-sectional view showing the electronic timepiece 10B, and FIG. 14 is a schematic plan view showing the circuit retainer 122 of the electronic timepiece 10B.
The electronic timepiece 10B differs from the electronic timepiece 10 in the configuration of the circuit retainer 122B, and the other configurations are the same. Therefore, the same components as those of the electronic timepiece 10 of the first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.

The circuit retainer 122B of the electronic timepiece 10B does not include the first conductive spring 123 that contacts the back cover 34, but includes the second conductive spring 129 that contacts the inner peripheral surface of the case body 31. As shown in FIG. The circuit retainer 122B is arranged so that the planar distance from the antenna feeding pin 240, which is a feeding member, is within the second threshold in plan view. In this embodiment, the second threshold is 15 mm, which is the same as the first threshold.
The second conduction spring 129 extends outward from the movement and is configured to contact the inner peripheral surface of the case body 31 when the circuit retainer 122B is placed inside the case body 31. As shown in FIG.

The electronic timepiece 10B of the second embodiment also includes a second conduction spring 129 that electrically connects the metal case body 31 and the ground terminal 125 of the circuit board 120 via the circuit retainer 122B. 129 is placed within the second threshold value in plan view from the antenna feed pin 240, so that the current distribution can be effectively distributed around the feed point where the current distribution concentrates. Receiving sensitivity can be improved.

[Modification]
It should be noted that the present disclosure is not limited to the above-described embodiments, and includes modifications, improvements, and the like within a range that can achieve the purpose of the present disclosure.
In the above-described embodiment, the conductor plate 160 is formed with the hook portion 163 that engages with the protrusion 219 of the antenna 200, and the antenna 200 is attached to the movement by the conductor plate 160. 219 may be formed to secure the antenna 200 to the ground plane 100 . In this case, since it is not necessary to form the hook portion 163 on the conductor plate 160, the shape of the conductor plate 160 is simplified, and the bending process is reduced, so that the cost can be reduced.
Also, as shown in FIG. 15, the antenna 200B may be screwed to the base plate 100. FIG. That is, the flanges 226 for screwing are formed at a plurality of locations on the inner peripheral surface of the planar ring-shaped antenna 200B, and the flanges 226, the extending portion 162B of the conductor plate 160B arranged on the lower surface of the flange 226, and the ground plate The antenna 200B and the base plate 100 are extended by inserting the screw pin 260 from the base plate 100 side into the through hole 106B formed in the base plate 100, and screwing the screw 250 into the screw pin 260 from the flange 226 side with the spacer 270 interposed therebetween. You may fix by pinching|interposing the protrusion part 162B.

Moreover, the second fixing member that fixes the conductive plate 160 and the ground terminal 125 in an insulated state is not limited to the configuration of the above embodiment. For example, as shown in FIG. 16, a second fixing member 180C having a screw pin 181C that engages with the stepped portion 106A of the base plate 100 and a screw 192C that is screwed into the screw pin 181C from the circuit board 120 side is used. It may be used in combination with conductor plate 160C having opening 169 with a larger diameter than flange 182C. That is, if the screw 191B for fixing the conductor plate 160C is structurally unnecessary, an opening 169 is formed in the conductor plate 160C so that the flange 182C is not electrically connected to the conductor plate 160C, and the screw pin 181C and the screw 192C are connected to the second screw. 2, the motor 142 and the circuit board 120 may be fixed.
Furthermore, a non-conductive screw, screw pin, or the like may be used as the second fixing member.

When disposing a third conduction spring that electrically connects the circuit retainer 122 and the back cover 34 or the case body 31 for the purpose of static electricity countermeasures, the third conduction spring extends from the antenna feed pin 240 in a plan view. It may be arranged at a position where the distance is greater than the first and second thresholds, that is, 15 mm, and may be configured to be conductive with an impedance higher than that of the first conduction spring and the second conduction spring. As a result, countermeasures against static electricity can be improved, and the impedance of the first conduction spring 123 and the second conduction spring 129 near the feeding point becomes relatively low, so that the deterioration of reception sensitivity can be prevented. As a method for increasing the impedance of the third conduction spring, for example, the third conduction spring is configured as a spring spring separate from the circuit retainer 122, and the impedance is adjusted by changing the properties of the spring. may For example, the impedance can be adjusted by changing the material of the spring and the thickness of the wire. Also, the impedance may be adjusted by providing an element such as a resistance component on the ground terminal side of the circuit board 120 to which the third conduction spring is conducted.

In the above-described embodiment, the conductor plate 160 serving as the hour wheel retainer is used as the ground plane. may

In each of the above-described embodiments, the back cover 34 and the case body 31 made of a conductive material are connected to the ground terminal 125 of the circuit board 120 by the first conductive spring 123 and the second conductive spring 129 to function as a ground plane. However, only the case body 31 or only the back cover 34 may function as the ground plane. Furthermore, only the conductor plate 160 may function as a ground plane.

The antenna element 220 of the annular antenna 200 is not limited to one set to resonate at one wavelength, and may be set to resonate at a half wavelength or a quarter wavelength. good.
In the above embodiment, the GPS satellite was explained as an example of the positioning information satellite S. However, as the positioning information satellite S, other global navigation satellite systems (GNSS) such as Galileo, GLONASS, and Beidou, and geostationary satellite type Satellites such as Satellite Navigation Augmentation System (SBAS) and Regional Satellite Positioning System (RNSS) that can search only in a specific area such as Quasi-Zenith Satellites can also be applied.
Antenna 200 is not limited to one that receives GPS satellite signals, Bluetooth (registered trademark), BLE (Bluetooth Low Energy), Wi-Fi (registered trademark), NFC (Near Field Communication), LPWA (Low Power Wide Area ) for transmitting and receiving other radio waves.

[Summary of this disclosure]
An electronic timepiece of the present disclosure includes an antenna for receiving radio waves, which includes an annular base material and an antenna element, a receiver for processing radio waves received by the antenna, a power supply terminal for feeding power to the antenna, and a ground terminal. a circuit board, a power supply member that electrically connects the antenna element and the power supply terminal, and a conductor arranged between the antenna and the circuit board in a side view viewed from a direction orthogonal to a central axis of the antenna. A plate, and a first fixing member and a second fixing member for fixing the conductive plate and the circuit board, wherein the first fixing member has, in a plan view seen from the direction of the central axis, The second fixing member is arranged at a position closer to the power supply member than the second fixing member, and fixes the conductor plate and the ground terminal in a conductive state, and the second fixing member connects the conductor plate and the ground terminal. It is characterized in that it is fixed in an insulated state.
According to the electronic timepiece of the present disclosure, since the first fixing member and the second fixing member are used, the conductor plate can be reliably fixed to the circuit board at a plurality of points. In addition, the first fixing member for fixing the conductive plate and the ground terminal of the circuit board in an electrically conductive state is provided only at one location near the power feeding member of the antenna, and the other portions fix the conductive plate and the ground terminal in an insulated state. Since it is fixed by the second fixing member, it is possible to effectively distribute the current around the feeding point where the current distribution concentrates, thereby improving the receiving sensitivity of the antenna.

The electronic timepiece of the present disclosure is characterized in that the second fixing member is positioned in a region where at least one of the electric field strength and the magnetic field strength in the conductor plate is 3 dB or more smaller than the maximum value.
According to the electronic timepiece of the present disclosure, the fixing member arranged in a region where at least one of the electric field strength and the magnetic field strength in the conductor plate is 3 dB or more smaller than the maximum value is fixed to the conductor plate and the ground terminal in a non-contact state. Since it is the second fixing member, it is possible to prevent the reception sensitivity of the antenna from being lowered.

In the electronic timepiece of the present disclosure, the first fixing member has a fan-shaped first fixing member extending +90° to −90° in the outer peripheral direction of the timepiece centered on a line connecting the power supply member and the center of the timepiece in plan view. It is characterized by being arranged in a range.
According to the electronic timepiece of the present disclosure, the reception sensitivity of antenna 200 can be improved because the first fixing member is arranged in the first range. In addition, since the first range can be set once the position of the feed point of the antenna is determined, there is no need to set the first range by obtaining the electric field strength and magnetic field strength by simulation or the like. can be easily designed. Furthermore, since the first range is set to approximately half the area of the conductive plate, the range in which the first fixing member can be arranged is relatively wide, and can be easily set according to the arrangement position of the motor.

In the electronic timepiece of the present disclosure, the second fixing member is made of a conductive material and is insulated from the conductor plate by a resin spacer.
According to the electronic timepiece of the present disclosure, insulation is provided by the resin spacer, so the second fixing member can be made of the same conductive material as the first fixing member.

The electronic timepiece of the present disclosure is characterized in that the conductor plate is an hour wheel retainer.
According to the electronic timepiece of the present disclosure, the conductor plate also serves as an hour wheel retainer, so the number of parts can be reduced.

The electronic timepiece of the present disclosure includes a back cover made of metal and a first conduction spring that electrically connects the ground terminal and the back cover, and the first conduction spring extends from the power supply member in plan view. is arranged at a position where the planar distance of is within the first threshold.
According to the electronic timepiece of the present disclosure, since the first conductive spring can be arranged at a position close to the power supply member, it is possible to effectively distribute the current around the power supply point where the current distribution is concentrated. Sensitivity can be improved.

The electronic timepiece of the present disclosure includes a metal case body and a second conduction spring that electrically connects the ground terminal and the case body, and the second conduction spring extends from the power supply member in plan view. is arranged at a position where the planar distance of is within the second threshold.
According to the electronic timepiece of the present disclosure, the metal case body and the ground terminal of the circuit board can be electrically connected by the second conduction spring via the circuit retainer. Since the planar distance from the feed point is within the second threshold, current distribution can be effectively achieved around the feeding point where the current distribution concentrates, and the reception sensitivity of the antenna can be improved.

In the electronic timepiece of the present disclosure, the first conduction spring has a fan-shaped second spring of +60° to −60° in the outer peripheral direction of the timepiece about a line connecting the power supply member and the center of the timepiece in plan view. It is characterized by being arranged in a range.
According to the electronic timepiece of the present disclosure, the first conduction spring can be arranged within the first threshold in plan view from the power supply member, and the current can be effectively distributed around the power supply point where the current distribution concentrates. It is possible to improve the reception sensitivity of the antenna.

The electronic timepiece of the present disclosure is characterized by comprising a conductive circuit retainer for holding the circuit board, wherein the first conductive spring is integrally formed with the circuit retainer.
According to the electronic timepiece of the present disclosure, since the first conduction spring is formed integrally with the circuit retainer, there is no need to configure the first conduction spring as a separate part, and the number of parts can be reduced.

In the electronic timepiece of the present disclosure, a third conduction spring that electrically connects the ground terminal and the back cover is provided, and the third conduction spring has a planar distance from the power supply member that is the first It is characterized in that it is arranged at a position greater than the threshold value and conducts with impedance higher than that of the first conduction spring.
According to the electronic timepiece of the present disclosure, since the third conductive spring is provided, the countermeasure against static electricity can be improved. Also, since the third conductive spring has a higher impedance than the first conductive spring, it is possible to effectively distribute the current around the feed point where the current distribution concentrates, thereby improving the reception sensitivity of the antenna.

DESCRIPTION OF SYMBOLS 10... Electronic timepiece 10B... Electronic timepiece 11... Dial plate 29A... Shaft 30... Exterior case 31... Case body 34... Back cover 50... Solar panel 100... Main plate 105... Through hole 106... Through hole 106A Stepped portion 120 Circuit board 121 Feeding terminal 122 Circuit retainer 122B Circuit retainer 123 First conductive spring 125 Ground terminal 126 Second range 129 Second 2 conductive springs 130 secondary battery 140 drive mechanism 160 conductor plate 160B conductor plate 160C conductor plate 161 plate-like portion 162 extension 162B extension 163 Hook portion 163A Through hole 164 Conductive spring portion 165 Hole 166 First range 169 Opening 170 Antimagnetic plate 180A First fixing member 180B Second fixing member 181A...screw pin, 181B...screw pin, 181C...screw pin, 182A...flange, 182B...flange, 182C...flange, 191A...screw, 191B...screw, 192A...screw, 192B...screw, 192C...screw, 193...spacer, 200... Antenna 200B Antenna 210 Antenna base 220 Antenna element 221 Ground element 225 Feeding element 240 Antenna feeding pin 270 Spacer 300 GPS receiver 400 Control display.

Claims (10)

an antenna that receives radio waves and that includes an annular base material and an antenna element;
a circuit board comprising a receiver for processing radio waves received by the antenna, a power supply terminal for supplying power to the antenna, and a ground terminal;
a power supply member that electrically connects the antenna element and the power supply terminal;
a conductor plate disposed between the antenna and the circuit board in a side view viewed from a direction perpendicular to the central axis of the antenna;
a first fixing member and a second fixing member for fixing the conductor plate and the circuit board;
The first fixing member is arranged at a position closer to the power supply member than the second fixing member in a plan view seen in the direction of the central axis, and the conductor plate and the ground terminal are electrically connected. fixed,
The electronic timepiece, wherein the second fixing member fixes the conductor plate and the ground terminal in an insulated state. The electronic timepiece according to claim 1,
The electronic timepiece, wherein the second fixing member is positioned in a region where at least one of the electric field intensity and the magnetic field intensity in the conductor plate is 3 dB or more smaller than a maximum value. In the electronic timepiece according to claim 1 or claim 2,
The first fixing member is arranged in a fan-shaped first range of +90° to -90° in the outer peripheral direction of the timepiece centered on a line connecting the power supply member and the center of the timepiece in the plan view. An electronic clock characterized by: In the electronic timepiece according to any one of claims 1 to 3,
An electronic timepiece, wherein the second fixing member is made of a conductive material and is insulated from the conductor plate by a resin spacer. In the electronic timepiece according to any one of claims 1 to 4,
An electronic timepiece, wherein the conductive plate is an hour wheel retainer. In the electronic timepiece according to any one of claims 1 to 5,
metal back cover,
a first conduction spring that conducts the ground terminal and the back cover,
The electronic timepiece according to claim 1, wherein the first conductive spring is arranged at a position where a planar distance from the power supply member is within a first threshold value in plan view. In the electronic timepiece according to any one of claims 1 to 5,
a metal case body,
a second conduction spring that conducts the ground terminal and the case body,
The electronic timepiece according to claim 1, wherein the second conductive spring is arranged at a position where a planar distance from the power supply member is within a second threshold value in plan view. The electronic timepiece according to claim 6,
The first conduction spring is arranged in a fan-shaped second range of +60° to -60° in the outer circumferential direction of the timepiece centered on a line connecting the power supply member and the center of the timepiece in the plan view. An electronic clock characterized by: In the electronic timepiece according to claim 6 or claim 8,
A conductive circuit holder that holds the circuit board is provided,
The electronic timepiece, wherein the first conductive spring is formed integrally with the circuit retainer. In the electronic timepiece according to claim 6, claim 8, or claim 9,
A third conduction spring that conducts between the ground terminal and the back cover,
The third conduction spring is arranged at a position where the plane distance from the power supply member in plan view is larger than the first threshold value, and is conducted with impedance higher than that of the first conduction spring. electronic clock.

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