JP5741734B2 - Clock with wireless function - Google Patents

Description

    The present invention relates to a wireless function watch capable of receiving wireless radio waves.

In recent years, watches having a wireless communication function have been developed. As such a wireless communication function, for example, a function of detecting the current position by receiving radio waves from a position information satellite such as GPS (Global Positioning System) is used.
As such a watch with a wireless function, for example, when a wireless function is given to a wristwatch, an antenna that can ensure a good function in a limited space is required.

Patent Documents 1 to 3 disclose a wristwatch having a terminal function of a satellite communication system or a wristwatch having a function of transmitting / receiving a radio broadcast signal.
In Patent Document 1, a C-type loop antenna with a dielectric substrate is arranged around a display unit, and a metal main body base of a wristwatch is used as a ground plate.
In Patent Document 2, GPS antennas are arranged side by side next to a display unit of a wristwatch. The GPS antenna is fixed to the metal case of the wristwatch with double-sided tape.
In Patent Document 3, an antenna and a transmission / reception circuit are collectively installed on a resin bezel, and a transmission / reception mechanism can be easily added to a wristwatch by attaching / detaching the bezel. The antenna is covered with a bezel and hidden from view.

JP 2000-59241 A Japanese Patent Laid-Open No. 2001-27680 Japanese Patent Laid-Open No. 10-160872

By the way, a timepiece is required not only for practical functionality such as time display and communication, but also for high quality texture. This tendency is particularly noticeable in wristwatches that display pointers.
In such a watch, a metal material having a precision finish is used for the exterior of a case, a dial, or the like. In addition, functional elements such as communication antennas are required to be interior-coated or covered as much as possible so as not to impair the appearance.

In response to such a requirement, the configurations of Patent Documents 1 and 2 described above cannot be employed when the communication antenna is exposed greatly adjacent to the display unit and the above-described texture is taken into consideration.
Further, the configuration of Patent Document 3 described above has a problem that sufficient antenna performance cannot be ensured although it is difficult to cause a problem in appearance. That is, in Patent Document 3, although the communication antenna is not exposed, the ground plate cannot be secured.
The metal case and dial described above are preferable in terms of texture, but the inside is electromagnetically shielded by its conductivity. For this reason, when an antenna is accommodated inside these metal cases and dials, there is a problem that sufficient antenna performance cannot be obtained.

  A main object of the present invention is to provide a wireless function watch capable of simultaneously ensuring good texture and good antenna performance.

The wireless function watch of the present invention includes a time display movement, a conductive case that houses the movement, a cover glass that is provided on the surface side of the case and covers the surface side of the movement, the movement, and A conductive conductor plate disposed between the cover glasses and reflecting radio waves; and an antenna disposed along an outer periphery of the conductor plate between the conductor plate and the cover glass, and The antenna has an annular dielectric substrate disposed along the outer peripheral edge of the conductor plate, a substantially annular conductive antenna electrode, the cover glass is attached to the case, and The cover glass is formed to extend from the position where the antenna electrode is formed to the movement side .

Here, the substantially annular antenna electrode constituting the antenna includes, for example, a C-shaped antenna electrode lacking a part of the ring in addition to the annular antenna electrode.
In the present invention, the conductive plate is arranged on the surface side of the watch covered with the cover glass, for example, on the portion where the dial plate appears in a normal wristwatch design. In particular, in the case of a wristwatch, it is preferable to form the case from a metal in order to enhance the texture of the watch itself. In such a case, it is difficult to input radio waves from the side surface or the back cover side of the watch. Only radio wave input. Even in such a case, as described above, the conductor plate is disposed on the surface side where the watch cover glass is provided, so that the input radio wave can be reflected by the antenna electrode and received. Further, the conductor plate disposed on the surface side of the timepiece is provided between the movement and the cover glass. Here, since the support shaft that supports the pointer is disposed between the movement and the cover glass, a sufficient space for arranging the conductor plate can be secured inside the case. Therefore, the area of the conductor plate can be increased, and a large number of radio waves can be reflected by the conductor plate and input to the antenna electrode, so that good antenna performance can be ensured.
The antenna electrode is preferably configured to receive more radio waves, and it is preferable to use an antenna electrode having a longer size. In the present invention, for example, an antenna in which an O-shaped or C-shaped substantially annular antenna electrode is disposed can be used, and the antenna electrode can be disposed along the outer peripheral edge of the conductor plate, for example, a rod-shaped antenna or an arc-shaped antenna. Compared to an antenna, the antenna receiving area is increased, and radio waves can be received more favorably. Further, the outer peripheral shape of the conductor plate may be formed to be substantially the same shape as the inner peripheral shape of the case. In this case, the antenna electrode can be arranged along the outer periphery of the watch, The side can be used effectively.
Furthermore, the cover glass is formed extending from the position where the antenna electrode is formed to the movement side. In such a configuration, radio waves input from the side of the watch can be received by the antenna electrode without being affected by the conductive case. Therefore, since more radio waves can be received by the antenna electrode, the antenna characteristics can be further improved. Moreover, by covering the surface side of the watch with a cover glass over a wide range, for example, a higher-class feeling peculiar to glass is produced than a configuration in which a cover glass is provided on a case via another member of a bezel made of ceramic or the like. Can provide a higher quality watch.
As described above, it is possible to provide a timepiece with a wireless function in which good antenna performance is ensured while maintaining the quality of the timepiece.

  In this invention, the antenna has an annular dielectric substrate and a substantially annular conductive antenna electrode. In general, the antenna electrode needs to be formed longer than the length corresponding to the wavelength of the radio wave to be received. For example, in a small timepiece such as a wristwatch, it is difficult to ensure the length of the antenna electrode. . On the other hand, in the present invention, by providing the dielectric base material, the wavelength of the radio wave input by the dielectric base material can be shortened, and the radio wave having a predetermined wavelength is shorter than the wavelength of the radio wave. It becomes possible to receive with the antenna electrode of a dimension. Moreover, since the dielectric base material is formed in an annular shape, it can be disposed along the outer peripheral edge of the conductor plate, and the appearance of the watch is not deteriorated.

In the wireless function watch according to the aspect of the invention, it is preferable that the antenna is hidden by a non-conductive member so that the antenna cannot be visually recognized from the outside of the cover glass.
In the wireless function watch of the present invention, the antenna may be concealed so as to be invisible from the outside of the cover glass by a dial ring which is a non-conductive member, or overlaps the antenna of the cover glass. It may be concealed so as not to be visible from the outside of the cover glass by performing inner surface printing using a non-conductive ink at a position.
By covering the antenna with a non-conductive non-conductive member such as a dial ring or ink in this way, it is possible to easily prevent the inconvenience of the antenna being exposed to the watch surface and deteriorating its appearance, and maintaining the quality of the watch in high quality. can do.

The wireless function watch of the present invention includes a time display dial having translucency, and a solar panel that is disposed between the dial and the movement and receives light to generate power, and the conductor. The plate is preferably a solar panel support substrate that supports the solar panel.
In the present invention, when a solar panel is incorporated, the solar panel support substrate that supports the solar panel can also be used as a conductor plate that reflects radio waves, and the configuration of the timepiece can be simplified. Moreover, a solar panel can be provided in the whole inner peripheral side of a solar panel by arrange | positioning an antenna along the outer periphery of a solar panel support substrate. Therefore, a solar panel that secures a sufficient light receiving area can be provided, and power generation efficiency can be improved.

In the wireless function watch of the present invention, it is preferable that the conductor plate is a dial for displaying time.
In the present invention, when the dial is made of a metal with a high texture, the dial itself can be used as a conductor plate, and the configuration of the timepiece can be simplified. In addition, since the antenna is arranged along the outer peripheral edge of the dial, there is no inconvenience such as the scale displayed on the dial being hidden by the antenna, the visibility of the dial is improved, and the antenna reception characteristics are improved. Can be made compatible.

  In the wireless function watch of the present invention, the case includes a radio wave reflection surface that reflects radio waves entering from the cover glass side to the antenna on at least a part of one end surface on the cover glass side, and the conductor plate includes: The outer peripheral edge is preferably disposed in close contact with the inner peripheral surface of the case.

  In the present invention, a radio wave reflecting surface is formed on one end surface of the conductive case. Therefore, the radio wave can be reflected by the radio wave reflecting surface and guided to the antenna electrode, and the antenna performance can be further improved. In addition to this, the outer peripheral edge of the conductor plate is in close contact with the case, there is no gap between the conductor plate and the case, and the same effect as when the conductor plate is extended to the outer peripheral side can be obtained, that is, more Radio waves can be reflected to the antenna electrode. Therefore, the receiving sensitivity of the antenna can be further increased.

In the wireless function watch of the present invention, it is preferable that the cover glass includes a surface portion covering the watch surface side and a cylindrical side end portion formed along an outer peripheral edge of the surface portion.
In the wireless function watch of the present invention, the cover glass has a surface portion covering the surface side of the movement and an outer peripheral portion of the surface portion in a cross-sectional view of the wireless function watch along the watch thickness direction. A side end portion fixed to the case, and the end surface of the side end portion is at least closer to the movement side than the upper surface facing the surface portion of the antenna. It is preferably fixed.
In the wireless function watch of the present invention, the cover glass is fitted into the concavo-convex portion formed on the end surface of the exterior case by fitting the concavo-convex portion formed on the end surface of the side end portion of the cover glass into the case. It is preferable that it is attached.

  In this invention, the end surface of the side end portion of the cover glass is disposed on the movement side with respect to the upper surface of the antenna, and more preferably is disposed so as to be substantially flush with the conductor plate. In such a configuration, radio waves input from the side of the watch can be received by the antenna electrode without being affected by the conductive case. Therefore, since more radio waves can be received by the antenna electrode, the antenna characteristics can be further improved. Moreover, by covering the surface side of the watch with a cover glass over a wide range, for example, a higher-class feeling peculiar to glass is produced than a configuration in which a cover glass is provided on a case via another member of a bezel made of ceramic or the like. Can provide a higher quality watch.

  In the wireless function watch of the present invention, the antenna includes an annular dielectric substrate disposed along an outer peripheral edge of the conductor plate, and the antenna electrode faces the cover glass of the dielectric substrate. A substantially annular antenna main body disposed on the upper surface, and at least one or more branched from at least one branch point provided in a part of the antenna main body and extending to a side surface of the dielectric substrate A feeding point formed continuously on one end side opposite to the branch point of the coupling portion and provided on a part of the lower surface side of the dielectric substrate facing the movement; The conductor plate includes a penetrating portion that penetrates the conductor plate along the watch thickness direction at a position facing the feeding point, and the wireless function watch is inserted through the penetrating portion of the conductor plate. And without contact with the conductor plate And contacts with the feeding point, further comprising a connecting member for transmitting to the receiver for processing the received signal based on radio waves received by the antenna is preferred.

  In this invention, the radio wave received by the antenna main body is transmitted to the signal processing circuit from the power feeding unit formed on the lower surface side of the dielectric via the connecting member. Here, the conductor plate is formed with a penetrating portion facing the power feeding portion, so that the power feeding portion and the conductor plate do not contact each other, and the connection member does not contact the conductor plate. The signal can be transmitted from the connecting member to the signal processing circuit without escaping to the conductor plate.

In the wireless function watch of the present invention, it is preferable that the antenna receives a circularly polarized radio wave.
Here, examples of circularly polarized waves include satellite signals transmitted from position information satellites such as GPS: Global Positioning System, Galileo (European Satellite Navigation System), SBAS: Satellite-Based Augmentation System. Such satellite signals can be received from position information satellites anywhere on the earth. Therefore, for example, a watch having a function for correcting the time using the time information included in the satellite signal can reliably receive the radio wave from the position information satellite anywhere on the earth, and the time is always accurate. Can be maintained.

It is the schematic which shows the wristwatch with GPS which is a timepiece with a wireless function concerning the present invention. It is a schematic sectional drawing of the wristwatch with GPS of the said embodiment. It is an enlarged view of the wristwatch with GPS of the embodiment. It is a disassembled perspective view of the GPS antenna integrated in the GPS wristwatch of the embodiment. It is the schematic which shows the main hardware constitutions etc. of the wristwatch with GPS of the said embodiment. It is a schematic sectional drawing of the timepiece with GPS of 2nd Embodiment. It is a disassembled perspective view of the GPS antenna integrated in the GPS wristwatch of the second embodiment. It is a schematic sectional drawing of the timepiece with GPS of 3rd Embodiment. It is a schematic sectional drawing of a part of the timepiece with GPS of another embodiment, (A) is a cross section when the radial dimension of the solar panel support substrate is large, (B) is a cross section when the radial dimension of the solar panel support substrate is small The figure is shown. It is a figure which shows an example of the GPS antenna of other embodiment. It is a figure which shows an example of the GPS antenna of other embodiment. It is a figure which shows an example of the GPS antenna of other embodiment.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
1 to 5 show a first embodiment of the present invention.
FIG. 1 is a schematic view showing a wristwatch 1 with a GPS time adjustment device (hereinafter referred to as “GPS wristwatch 1”), which is a wireless function watch according to the present invention. FIG. 2 is a schematic cross-sectional view of the GPS wristwatch 1. FIG. 3 is an enlarged view of the GPS wristwatch 1, and FIG. 4 is an enlarged perspective view of an antenna incorporated in the GPS wristwatch 1. FIG. 5 is a schematic diagram showing the main hardware configuration of the GPS wristwatch 1.

As shown in FIG. 1, the GPS wristwatch 1 includes a time display unit including a dial 2 and hands 3. An opening is formed in a part of the dial plate 2, and a display 4 composed of an LCD display panel or the like is incorporated.
The pointer 3 includes a second hand, a minute hand, an hour hand, and the like, and is driven via a drive mechanism including a step motor and a gear train, which will be described later.
The display 4 is composed of an LCD display panel and the like, and displays message information as well as position information such as latitude, longitude, and city name.

The GPS wristwatch 1 receives satellite signals from a plurality of GPS satellites 5a, 5b, 5c, and 5d orbiting the earth over a predetermined orbit, acquires satellite time information, and obtains internal time information. It is configured so that it can be modified.
The GPS satellites 5a, 5b, 5c, and 5d are examples of position information satellites in the present invention, and a plurality of GPS satellites exist above the earth. At present, about 30 GPS satellites 5a, 5b, 5c, 5d orbit.
Further, the GPS wristwatch 1 is provided with a crown 6 and buttons 7 and 8 for external operation.

[Internal configuration of GPS wristwatch]
Next, the internal configuration of the GPS wristwatch 1 will be described.
As shown in FIGS. 2 and 3, the GPS wristwatch 1 includes a movement 110 that drives the hands 3, and a case 10 that houses the movement 110.

The case 10 includes a cylindrical outer case 101 and a back cover 102 that closes one opening (lower side in FIG. 2) of the outer case 101.
For the outer case 101 and the back cover 102, a conductive metal material such as BS (brass), SUS (stainless steel), titanium alloy or the like is used. The back cover 102 is connected to the opening of the outer case 101 by a screw structure. Thereby, a cavity 104 having an opening surface 103 is formed in the other opening (upper side in FIG. 2) of the exterior case 101 in the case 10, and the movement 110 is accommodated in the cavity 104.
In addition, a radio wave reflection surface 105 that is flush with a solar panel support substrate 120 described later is formed on the end surface of the exterior case 101 where the opening surface 103 is formed. As described above, the outer case 101 is formed of a conductive material. When a radio wave is incident from the front side, the radio wave reflection surface 105 can reflect the incident radio wave.

The movement 110 is for displaying the time by the above-described hands 3 and receiving signals from the GPS satellites 5a, 5b, 5c, and 5d. Circuit elements (IC and the like) for processing the time display and the GPS function are provided. A circuit board 25 mounted, a stepping motor for driving the pointer 3 and a driving mechanism 19 including a gear train, and a secondary battery 24 for supplying electric power thereto are provided.
The circuit elements mounted on the circuit board 25 include a receiving unit 18 that processes signals received from the GPS satellites 5a, 5b, 5c, and 5d, and a control unit 20 that controls the drive mechanism 19.

In the GPS wristwatch 1, the solar panel support substrate 120 is disposed on the opening surface 103 of the cavity 104, and the solar panel 120 </ b> A and the dial 2 are provided on the surface side of the solar panel support substrate 120.
The solar panel support substrate 120 is a conductive substrate formed of, for example, a metal material such as BS (brass), SUS (stainless steel), titanium alloy, and the like. It functions as a so-called ground plate (reflecting plate) that reflects radio waves incident from the glass 130 side toward the GPS antenna 11. Further, the solar panel support substrate 120 is formed in a disc shape having a diameter slightly larger than the inner peripheral diameter of the outer case 101 before being incorporated into the case 10. Then, the solar panel support substrate 120 is incorporated into the exterior case 101 by press-fitting, whereby the outer peripheral edge of the solar panel support substrate 120 is closely fixed to the inner peripheral surface of the exterior case 101.
In addition, a part of the outer peripheral edge of the solar panel support substrate 120, specifically, in the vicinity of the 9 o'clock position of the watch, is a notch 121 (the penetration of the present invention) that communicates the space on the cover glass 130 side and the space on the movement 110 side. Part) is formed.

Further, the solar panel 120A is fixed to the surface side of the solar panel support substrate 120, and power generation is performed by light incident from the cover glass 130 side. The solar panel 120A is connected to a charge control circuit 51 (see FIG. 5), and the electric power obtained by power generation is stored in the secondary battery 24 through the charge control circuit 51 as appropriate.
Further, a dial 2 is stretched on the surface of the solar panel 120A. Here, the dial 2 and the solar panel 120A are formed so that the outer peripheral diameters of the dial plate 2 and the inner peripheral diameter of the dial ring 140 are in close contact with the inner periphery of the dial ring 140. 120 is not visually recognized from the outside.
The dial plate 2 is formed of a non-conductive synthetic resin material such as polycarbonate, for example, has translucency, and does not hinder the transmission of incident light to the solar panel 120A.

  The above-described pointer 3 is disposed on the front side (upper side in FIG. 2) of the dial 2 and the movement 110 is disposed on the back side (lower side in FIG. 2) of the solar panel support substrate 120. In the movement 110, the drive mechanism 19, the circuit board 25, and the secondary battery 24 are arranged in layers in this order from the solar panel support substrate 120 side to the back cover 102 side. Among the circuit elements mounted on the circuit board 25, the receiving unit 18 is on the opposite side (back cover side) of the circuit board 25 with respect to the GPS antenna 11 and the LCD panel in order to avoid the influence of noise. 25 at the center. The control unit 20 is disposed on the surface of the circuit board 25 on the solar panel support substrate 120 side.

The GPS wristwatch 1 includes a GPS antenna 11 disposed along the outer periphery of the solar panel support substrate 120.
The GPS antenna 11 receives signals from the GPS satellites 5a, 5b, 5c, and 5d described above, and is disposed on the surface side of the solar panel support substrate 120. The outer periphery of the solar panel support substrate 120 and the GPS antenna 11 is formed so as to substantially coincide with the outer peripheral edge (see FIG. 3). Details of the GPS antenna 11 will be described later.

The GPS wristwatch 1 includes a dial ring 140 that accommodates the GPS antenna 11.
The dial ring 140 is formed in an annular shape whose outer diameter matches the dial 2, and has a recess that accommodates the GPS antenna 11 on the outer periphery. The dial ring 140 has an inclined surface (conical surface) whose inner periphery faces the dial 2, and an indicator scale is printed on the inclined surface in 60 divisions.

A bezel 150 is disposed on the outer periphery of the dial ring 140, and a cover glass 130 covering the surface side of the dial 2 and the hands 3 is disposed on the inner side of the bezel 150.
The bezel 150 is formed in an annular shape whose outer periphery is continuous with the outer periphery of the outer case 101, and the outer case 101 of the case 10 is formed by means of a fitting structure with unevenness formed on the opposing surfaces, a double-sided adhesive tape, an adhesive, or the like. It is connected to the. The bezel 150 holds the cover glass 130 and presses and holds the dial ring 140 toward the dial plate 2 side.
As described above, the cover glass 130 is disposed so as to cover the surface side of the movement 110, and the solar panel support substrate 120 functioning as a ground plate is disposed between the cover glass 130 and the movement 110. Between the cover glass 130, the pointer 3 and the GPS antenna 11 are arranged.

In the GPS wristwatch 1, the outer case 101 and the back cover 102 of the case 10 are each formed of a metal material having an excellent texture, and an appropriate surface finish is applied to the surfaces thereof.
Dial ring 140 and bezel 150 are formed of a non-conductive material, and cover glass 130 is also formed of a non-conductive glassy material. Each of these elements is also given a surface finish that takes into account the texture. As the non-conductive material constituting the bezel 150, for example, a synthetic resin can be used. However, the non-conductive material may be formed of a ceramic that has a higher hardness, is less likely to be scratched, and has a higher quality texture. preferable.
By using such a material, the dial ring 140, the bezel 150, and the cover glass 130 on the surface side of the dial 2 (upper side in FIG. 2) are all non-conductive materials, and these are the surfaces of the solar panel support substrate 120. There is no influence on the GPS antenna 11 installed on the outer periphery as an electromagnetic shield.

[Details of GPS antenna]
As shown in FIG. 4, the GPS antenna 11 includes a ring-shaped dielectric substrate 111 having a rectangular cross-sectional shape, and an antenna electrode 112 is formed on the surface thereof.

The dielectric substrate 111 has a function of shortening the wavelength of radio waves. That is, the satellite signals transmitted from the GPS satellites 5a, 5b, 5c, and 5d are circularly polarized waves having a frequency of 1575.42 MHzm and a wavelength of 19 cm, and the radio waves of such satellite signals are received by the loop antenna. For this, the perimeter of the antenna electrode 112 is required for 1.0 to 1.4 wavelengths of the radio wave of the satellite signal. On the other hand, by installing the antenna electrode 112 on the dielectric base material 111, the wavelength of the radio wave of the satellite signal can be shortened by the dielectric base material 111, and the shortened wavelength can be received by the antenna electrode 112. It becomes possible. Here, in the dielectric substrate 111 having a relative dielectric constant ε _r , the wavelength shortening rate of the radio wave is 1 / (ε _r ) ^1/2 . Therefore, when a radio wave of a satellite signal having a wavelength of 19 cm is received by, for example, the loop antenna type antenna electrode 112 having a diameter of about 3 cm (perimeter length of about 9.4 cm), the relative dielectric constant ε _r of the dielectric substrate 111 is 4 10 to 10 for example, so-called micalex (ε _r = 6.5 to 9.9) which is a ceramic mainly composed of alumina (ε _r = 8.5) or a ceramic mainly composed of mica. 5), glass (ε _r = 5.4 to 9.9), diamond (ε _r = 5.68), or the like can be used.

  Further, the height dimension of the dielectric base 111, that is, the distance (height dimension) from the lower surface facing the solar panel support substrate 120 to the upper surface facing the cover glass 130 is determined by placing the solar panel support substrate 120 on the antenna electrode 112. What is necessary is just to set to the distance required in order to function as a ground board with respect to. That is, the height dimension from the solar panel support substrate 120 to the antenna electrode 112 is 0.05 to 0.1 of the wavelength received by the antenna electrode 112, that is, the radio wave wavelength after being shortened by the dielectric substrate 111. If it is double, the radio wave reflected by the solar panel support substrate 120 can be appropriately received by the antenna electrode 112. For example, when the dielectric constant εr of the dielectric substrate 111 is 10, the radio wave of the satellite signal having a wavelength of 19 cm is shortened to about 4.25 cm by the dielectric substrate 111. In this case, if the distance from the solar panel support substrate 120 to the antenna electrode 112 is 0.21 cm to 0.42 cm which is 0.05 to 0.1 times the shortened wavelength, the antenna electrode 112 can be appropriately obtained. Thus, the radio wave reflected by the solar panel support substrate 120 can be received. In the GPS wristwatch 1 of the present embodiment, the height dimension of the dielectric base 111 is set to 0.3 cm.

The antenna electrode 112 is printed on the surface of the dielectric substrate 111 by printing a conductive metal element such as copper or silver on the surface of the dielectric substrate 111 or by bending a conductive metal plate such as silver or copper. By being affixed or the like, the dielectric substrate 111 is integrally formed. A pattern may be formed on the surface of the dielectric substrate 111.
The antenna electrode 112 includes an antenna main body portion 113, a coupling portion 114, and a power feeding portion 115.
The antenna main body 113 is a portion formed in a ring shape on the upper surface side of the dielectric base 111, and receives a radio wave entering from the cover glass 130 side or a radio wave reflected by the solar panel support substrate 120. A branch point 116 is formed at a part of the inner peripheral edge of the antenna main body 113, and a coupling portion 114 is formed extending from the branch point 116 to the inner peripheral side surface of the dielectric substrate 111. The coupling portion 114 is formed in the circumferential direction along the inner circumferential side surface of the dielectric substrate 111. The end portion of the coupling portion 114 opposite to the branch point 116 extends toward the lower surface side of the dielectric base material 111, and the power feeding portion continuous to the coupling portion 114 on the lower surface side of the dielectric base material 111. 115 is formed. As shown in FIG. 2, the power feeding portion 115 is formed at a position facing the notch portion 121 of the solar panel support substrate 120 in the 9 o'clock direction, and the connection pin 61 (the connection according to the present invention) is inserted through the notch portion 121. The tip of the member constitutes one point (feeding point 117) of the feeding part 115. Here, the length dimension from the branch point 116 to the feeding point 117 through the coupling portion 114 is a length dimension of about ¼ wavelength of the radio wave received by the GPS antenna 11. When the rate ε _r is 10, it is formed to 1.06 cm, for example.

The connection pin 61 that is in contact with the power feeding point 117 of the power feeding unit 115 is held by a connection base 62 that is erected in the 9 o'clock direction so as to be able to appear and retract. Thus, by providing the connection pin 61 in the 9 o'clock direction, structural interference with the crown 6 for external operation provided in the 3 o'clock direction, the buttons 7 and 8 provided in the 2 o'clock and 4 o'clock directions, and the like. Can be avoided. In addition, the connection pin 61 and the connection base 62 are electrically connected, and the connection base 62 is connected to the receiving unit 18. The connection base 62 is formed in a substantially cylindrical shape, and an urging member such as a coil spring is provided inside the cylinder to urge the connection pin 61 toward the power feeding unit 115. As a result, the connection pin 61 is pressed against the power feeding point 117, and the connection state between the connection pin 61 and the power feeding point 117 is maintained even when an impact is applied to the GPS wristwatch 1, for example.
Further, as shown in FIG. 4, the connection base 62 is connected to a connection point 251 at the center of the circuit board 25 by a lead wire. At the connection point 251, a reception unit provided on the back cover 102 side of the circuit board 25. 18 is connected. Here, the connection point 251 is preferably located at the center of the circuit board 25 in order to efficiently receive circularly polarized waves by the GPS antenna 11 of the one-wavelength loop antenna as in the present embodiment. On the other hand, when the connection point 251 is provided in the central portion of the circuit board 25, the wiring becomes long, so that there is a problem that signal loss increases. In order to improve such a problem, between the GPS antenna 11 and the receiving unit 18, more specifically, between the GPS antenna 11 and a filter (SWA) 31 (see FIG. 5) described later, an LNA ( A low noise amplifier) may be provided to compensate for signal loss.
The connection method between the connection base 62 and the reception unit 18 is not limited to the above. For example, the connection base 62 is connected to the printed wiring on the circuit board 25 and connected to the reception unit 18 via the printed wiring. And so on.

In the present embodiment, the solar panel support substrate 120 also serves as a ground plate, and has a function as a ground plate of the GPS antenna 11.
In general, it is desirable that the size of the ground plate of the antenna is as large as possible. If the ground plate is rectangular, the size of one side is the signal that is transmitted and received by the antenna. It is desirable that the wavelength is ¼ wavelength or more.
In this embodiment, it is preferable that the solar panel support substrate 120 as a ground plate has an outer diameter of 48 mm or more in order to adapt to signal reception from a GPS satellite. However, the dial 2 used as a wristwatch has an outer diameter of about 35 mm, and the necessary 48 mm cannot be secured. In order to compensate for this shortage, as described above, a radio wave reflection surface 105 that is flush with the solar panel support substrate 120 is formed on a part of the upper end surface of the exterior case 101, and the radio wave reflection surface 105 and the solar panel are formed. A configuration is adopted in which both support substrates 120 function as ground plates. Here, as described above, the solar panel support substrate 120 is press-fitted into the outer case 101, and the outer peripheral edge of the solar panel support substrate 120 and the inner peripheral surface of the outer case 101 are brought into close contact with each other. In addition, no gap is formed between the outer case 101 and the area to function as the ground plate is increased. As a result, it is possible to more efficiently reflect the incident radio wave to the GPS antenna 11 and improve the antenna characteristics.
In the present embodiment, an example in which the radio wave reflection surface 105 of the outer case 101 is formed so as to be on the same plane as the solar panel support substrate 120 is shown, but the present invention is not limited to this. That is, the distance from the radio wave reflection surface 105 to the upper surface of the dielectric base 111 is 0.05 to 0.1 times the wavelength received by the antenna electrode 112 (the wavelength of the radio wave shortened by the dielectric base 111). The antenna body 113 can appropriately receive the radio wave reflected by the radio wave reflection surface 105.

An LCD display panel or the like is installed along the back side of the dial 2 as the display 4. The LCD display panel is covered with a shield plate in order to block the influence of noise. At this time, since the solar panel support substrate 120 also serves as a ground plate, a shielding effect can be obtained also around the display 4.
The step motor of the drive mechanism 19 can also be a noise source. However, since the drive mechanism 19 is disposed on the opposite side of the solar panel support substrate 120 with respect to the GPS antenna 11, the drive mechanism 19 is shielded by the solar panel support substrate 120, and the GPS antenna. 11 is deterred.

  Furthermore, since the case 10 including the back cover 102 and the outer case 101 is made of metal, it is possible to avoid the influence on the GPS antenna 11 by the user's arm to be worn. That is, if the case 10 is a plastic case, it is not preferable because the resonance frequency of the antenna fluctuates due to the influence of nearby arms and when it is not worn, resulting in a difference in performance. However, since the case 10 is made of metal, the effect of the arm can be avoided by the shielding effect, and in this embodiment, there is almost no difference in antenna characteristics between when the sensor is mounted and when it is not mounted, and stable reception performance can be obtained.

[Circuit configuration of GPS wristwatch]
Next, the circuit configuration of the GPS wristwatch 1 will be described. As shown in FIG. 5, the GPS wristwatch 1 includes a GPS antenna 11, a filter (SAW) 31, a receiving unit 18, a display control unit 40, and a power supply unit 50.
The filter (SAW) 31 is a band-pass filter and extracts a 1.5 GHz satellite signal. Further, as described above, an LNA (low noise amplifier) that improves reception sensitivity may be separately incorporated between the GPS antenna 11 and the filter 31.
Note that the filter (SAW) 31 may be incorporated in the receiving unit 18.

The receiving unit 18 processes satellite signals extracted by a filter, and includes an RF unit (Radio Frequency) 27 and a baseband unit 30.
The RF unit 27 includes a PLL circuit 34, an IF filter 35, a VCO (Voltage Controlled Oscillator) 41, an ADC (A / D converter) 42, a mixer 46, an LNA (Low Noise Amplifier) 47, an IF amplifier 48, and the like. .

The satellite signal extracted by the filter 31 is amplified by the LNA 47, mixed with the signal of the VCO 41 by the mixer 46, and down-converted to IF (Intermediate Frequency).
The IF mixed by the mixer 46 passes through an IF amplifier 48 and an IF filter 35 and is converted into a digital signal by an ADC (A / D converter) 42.

The baseband unit 30 includes a DSP (Digital Signal Processor) 39, a CPU (Central Processing Unit) 36, and an SRAM (Static Random Access Memory) 37.
The baseband unit 30 is also connected with a crystal oscillation circuit (TCXO) 32 with a temperature compensation circuit, a flash memory 33 and the like.
The baseband unit 30 receives a digital signal from the ADC 42 of the RF unit 27, calculates a satellite signal based on the control signal, and can acquire satellite time information and positioning information.
The clock signal for the PLL circuit 34 is generated from a crystal oscillation circuit (TCXO) 32 with a temperature compensation circuit.

The display control unit 40 includes a control unit (CPU) 20 and a drive circuit 43 that drives the hands 3 and the LCD of the display 4.
The control unit 20 includes an RTC (real time clock) 20A and a storage unit 20B as hardware.
The RTC 20A measures internal time information using a reference signal output from the crystal resonator.
The storage unit 20B stores time data and positioning data output from the receiving unit 18. The storage unit 20B also stores time difference data corresponding to the positioning information, and the local time of the current location can be calculated from the internal time information and time difference data measured by the RTC 20A.
The GPS wristwatch 1 of the present embodiment includes the receiving unit 18 and the display control unit 40 as described above, so that the time display can be automatically corrected based on the received signal from the GPS satellite.

  The power supply unit 50 includes a solar panel 120A, a charge control circuit 51, a secondary battery 24, a first regulator 52, a second regulator 53, and a voltage detection circuit 54.

The secondary battery 24 supplies driving power to the display control unit 40 via the first regulator 52 and supplies driving power to the receiving unit 18 via the second regulator 53.
The solar panel 120 </ b> A supplies power to the secondary battery 24 through the charge control circuit 51 to charge the secondary battery 24.
The voltage detection circuit 54 monitors the voltage of the secondary battery 24 and outputs it to the control unit 20. Therefore, the control unit 20 can grasp the voltage of the secondary battery 24 and control the reception process.

[Effects of First Embodiment]
As described above, the GPS wristwatch 1 according to the first embodiment includes the solar panel support substrate 120 that functions as a ground plate between the cover glass 130 and the movement 110. A GPS antenna 11 having a ring-shaped dielectric substrate 111 and a ring-shaped antenna electrode 112 formed on the surface of the dielectric substrate 111 is provided between the solar panel support substrate 120 and the cover glass 130. ing.
For this reason, the radio wave of the satellite signal entering from the cover glass side can be reflected by the solar panel support substrate 120 having a relatively large area disposed on the cover glass 130 side and can be input to the antenna electrode 112. Performance can be secured. Further, since the antenna electrode 112 in which the ring-shaped antenna main body 113 is disposed is formed on the ring-shaped dielectric base material 111, the signal reception area of the antenna electrode 112 can be increased, and the reception sensitivity of the antenna can be improved. .
In addition, since the signal reception area of the antenna electrode 112 can be increased in this way, the choice of the dielectric base material 111 increases, and the design of the GPS antenna 11 can be simplified. That is, the antenna electrode 112 needs to have at least a length corresponding to the wavelength of the received radio wave. When the length of the antenna electrode 112 is small, the relative dielectric constant that shortens the radio wave wavelength according to the length is large. The dielectric substrate 111 is required. In such a case, the selection range of the dielectric substrate 111 is narrowed, and the cost is also increased. On the other hand, by employing the ring-shaped antenna electrode 112 as in the present embodiment, a sufficient peripheral length can be secured and the selection range of the dielectric base material 111 is widened. Therefore, it is possible to select an appropriate dielectric substrate 111 with lower cost, which is advantageous in manufacturing.
Furthermore, a metal exterior case 101 and a back cover 102 can be used as the case 10, and the quality of the watch can be maintained at high quality.

In the GPS wristwatch 1 of the present embodiment, the solar panel support substrate 120 that supports the solar panel 120A is used as the conductor plate.
With this configuration, the solar panel support substrate 120 can be used as a ground plate and a support substrate for the solar panel 120A without preparing a dedicated substrate that supports the solar panel 120A and a substrate that functions as a conductor plate. Can be used. Therefore, an increase in the number of parts can be suppressed and the configuration can be simplified.

A radio wave reflection surface 105 that is flush with the solar panel support substrate 120 is formed on the end surface of the exterior case 101 of the GPS wristwatch 1 on the opening surface 103 side. The solar panel support substrate 120 is press-fitted to the inner peripheral side of the outer case 101 so that the outer peripheral edge thereof is in close contact with the inner peripheral surface of the outer case 101.
For this reason, a ground plate can be comprised by both the electromagnetic wave reflective surface 105 and the solar panel support substrate 120. FIG. At this time, since no gap is generated between the radio wave reflecting surface 105 and the solar panel support substrate 120, radio waves can be reflected from the cover glass 130 side to the movement 110 side without being released.

The antenna electrode 112 of the GPS antenna 11 includes a ring-shaped antenna main body 113 disposed on the upper surface of the ring-shaped dielectric substrate 111 and a dielectric from a branch point that is one point on the inner periphery of the antenna main body 113. It is formed by a coupling portion 114 along the peripheral surface of the base material 111 and a power feeding portion 115 formed on the lower surface side of the dielectric base material 111 and continuing to the other end of the coupling portion 114 opposite to the branch point 116. The The solar panel support substrate 120 is provided with a notch 121 at a position facing the power feeding portion 115, and is a connection pin that is inserted through the notch 121 and urged toward the power feeding point 117 from the movement 110 side. 61 is provided.
For this reason, contact between the power feeding unit 115 and the solar panel support substrate 120 and contact between the connection pin 61 and the solar panel support substrate 120 can be prevented, and the antenna electrode 112 and the reception unit 18 of the circuit board 25 are connected by the connection pins. Can be reliably connected electrically. Further, since the connection pin 61 is biased toward the feeding point 117, for example, even when an impact is applied to the timepiece, the connection between the connection pin 61 and the feeding point 117 can be favorably maintained.

  The receiving unit 18 is provided on the back cover 102 side of the circuit board 25, and a solar panel support substrate 120 as a ground plate is provided between the receiving unit 18 and the GPS antenna 11. For this reason, the solar panel support substrate 120 functions as a shield against noise caused by the internal clock generated from the receiving unit 18. Therefore, the GPS antenna 11 is not affected by noise generated from the receiving unit 18 and can further improve the antenna characteristics.

  The GPS antenna 11 is disposed on the surface side of the dial 2, and the surrounding dial ring 140, bezel 150, etc. are made of a non-conductive material. For this reason, even if the case 10 is a metal material having an excellent appearance, it is not subjected to electromagnetic shielding, and good antenna performance can be ensured.

  Further, since the exterior case 101 and the back cover 102 constituting the case 10 are made of metal, there is little mismatch due to the effect of the arm on which the GPS wristwatch 1 is worn, and the antenna when worn and not worn. The difference in characteristics is reduced, and stable radio wave reception can be performed.

[Second Embodiment]
Next, a GPS timepiece according to a second embodiment of the invention will be described. FIG. 6 is a schematic sectional view of a GPS timepiece according to a second embodiment of the present invention. FIG. 7 is an exploded perspective view of the GPS antenna according to the second embodiment.
In the second embodiment, the configuration of each part of the GPS wristwatch 1A is the same as that of the first embodiment described above, and the description of the common configuration is omitted for the sake of brevity.

  In the first embodiment, the solar panel support substrate 120 constitutes the conductor plate of the present invention, and radio waves are reflected by the solar panel support substrate 120 and input to the GPS antenna 11. In contrast, in the second embodiment, as shown in FIGS. 6 and 7, the solar panel 120A and the solar panel support substrate 120 are not provided, and the dial 2A functions as the conductor plate of the present invention, that is, the ground. Functions as a board.

That is, in the GPS wristwatch 1 </ b> A according to the second embodiment, the dial 2 </ b> A is formed slightly larger than the inner peripheral system size of the outer case 101 and is fitted by being press-fitted into the inner periphery of the outer case 101. The dial 2A is made of a metal material such as BS (brass), SUS (stainless steel), or titanium alloy. Note that the surface of the dial 2A may be subjected to a surface treatment by painting, plating, sputtering, or the like in order to improve the appearance.
In such a configuration, the dial 2A is arranged on the opening surface 103 of the outer case 101 and also serves as a ground plate, so that radio waves entering from the cover glass 130 side are reflected to the antenna main body 113 of the antenna electrode 112. , Good antenna characteristics.

According to this embodiment, the same effects as those of the first embodiment described above can be obtained. That is, in the GPS wristwatch 1A, a dial plate 2A that functions as a ground plate is provided between the cover glass 130 and the movement 110, and a ring-shaped dielectric substrate 111 is provided between the dial plate 2A and the cover glass 130. A GPS antenna 11 having an antenna electrode 112 formed on the surface of the dielectric base 111 is provided.
For this reason, the radio wave of the satellite signal entering from the cover glass side can be reflected by the dial plate 2A having a relatively large area disposed on the cover glass 130 side and input to the antenna electrode 112, and good antenna performance can be obtained. It can be secured. Further, since the antenna electrode 112 in which the ring-shaped antenna main body 113 is disposed is formed on the ring-shaped dielectric base material 111, the signal reception area of the antenna electrode 112 can be increased, and the reception sensitivity of the antenna can be improved. .

And since the dial 2A should just obtain the electroconductivity as a ground plate, it can be made from a metal with a high texture. Further, since the GPS antenna 11 is arranged along the outer periphery of the dial 2A, even if it is covered with the dial ring 140, the display portion of the dial 2A is not hidden.
For this reason, the appearance of the GPS wristwatch 1A can be improved.
Furthermore, since the GPS wristwatch 1A also uses the dial 2A itself as a ground plate, the structure can be simplified.

[Third Embodiment]
Next, a GPS wristwatch 1B according to a third embodiment of the present invention will be described. FIG. 8 is a cross-sectional view showing a schematic configuration of a GPS wristwatch 1B according to the third embodiment. In this embodiment, the configuration of each part of the GPS wristwatch 1B is the same as that of the first embodiment described above, and the description of the common configuration is omitted for the sake of brevity.

In the GPS wristwatches 1 and 1A according to the first embodiment and the second embodiment, the bezel 150 is disposed on the end surface of the outer case 101, and the cover glass 130 is held by the bezel 150. However, the third embodiment Then, as shown in FIG. 8, the cover glass 130 </ b> A is provided directly on the exterior case 101. The cover glass 130A includes, for example, a surface portion 131 that covers the watch surface side by cutting and polishing a plate-like glass, and a cylindrical side end portion 132 that is formed along the outer peripheral edge of the surface portion 131. Manufactured by processing into a container. Then, an uneven portion is formed on the end surface of the side end portion 132 of the cover glass 130A, and the cover glass 130A is attached to the case 10 by being fitted into the uneven portion formed on the end surface of the exterior case 101, and the GPS antenna. 11 is attached to cover the surface from the side. Here, the end surface of the side end portion 132 of the cover glass 130 </ b> A is formed to extend toward the movement 110 from the upper surface on which the antenna main body portion 113 of the GPS antenna 11 is formed. More specifically, the end surface of the side end portion 132 is formed at substantially the same height as the planar height position of the solar panel support substrate 120, and is fixed to the exterior case 101.
In the third embodiment, as in the first and second embodiments, the GPS antenna 11 is covered with the dial ring 140 so that the GPS antenna 11 cannot be seen from the outside. It is good also as a structure which gives inner surface printing in the position which overlaps with the GPS antenna 11, and the GPS antenna 11 cannot be visually recognized from the outside. In this case, non-conductive ink that does not affect the reception characteristics of the antenna is used as the printing ink.

Further, in the GPS wristwatch 1B of the third embodiment, a charging coil 55 is provided so as to face the back cover 102, and power can be charged from an external charger by electromagnetic induction.
In order to effectively carry out such charging by electromagnetic induction, the back cover 102 has a substantially annular metal first back cover part 102A and a disk-like shape held by the first back cover part 102A. And a second back cover 102B made of glass. In addition, although it was set as the structure which charges the secondary battery 24 here by both the charging coil 55 and the solar panel 120A here, you may implement charging only by the solar panel 120A similarly to the said 1st Embodiment, A charging coil It is good also as a structure which implements charge only by 55. Moreover, when charging only with the charging coil 55, the dial 2A can be used as a conductor board similarly to the said 2nd Embodiment.

According to the present embodiment, in addition to the same effects as those of the first embodiment described above, the number of parts can be reduced by the amount that the bezel 150 is not provided. Further, when the ceramic bezel 150 is used, the surface is easily scratched, and the texture may deteriorate with long-term use, but in this embodiment, the outer case 101 is covered with glass that is not easily scratched, It can also prevent deterioration of texture due to long-term use. Further, as compared with the cover glass 130 provided via another member such as the bezel 150, the entire surface side of the GPS wristwatch 1 is covered with the cover glass 130A, so that a high-class feeling peculiar to glass can be obtained.
Further, since the cover glass 130A is formed so as to cover the top surface from the side surface of the GPS antenna 11, radio waves entering from the side surface side of the GPS wristwatch 1B can also be received by the GPS antenna 11.

Other Embodiment
In addition, this invention is not limited to said each embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention.

For example, in each of the first to third embodiments, the configuration in which the outer peripheral diameter of the solar panel support substrate 120 and the dial 2A, which are conductor plates, and the outer peripheral edge of the GPS antenna 11 substantially coincide with each other is illustrated. It is not limited to this. For example, as shown in FIG. 9A, the outer diameter of the solar panel support substrate 120, which is a conductor plate, is further increased, and the GPS antenna 11 is arranged on the inner periphery side of the outer periphery of the solar panel support substrate 120. Also good. In this case, the exterior case 101 is provided with a step recess 106 that holds the outer peripheral edge of the solar panel support substrate 120, and the solar panel support substrate 120 is fitted into the step recess 106 so that the solar panel support substrate 120 is attached to the exterior case 101. The case 101 can be disposed on substantially the same plane as the radio wave reflection surface 105 of the case 101.
Further, as shown in FIG. 9B, the outer diameter of the solar panel support substrate 120 that is a conductor plate may be formed small. In this case, the radio wave reflection surface 105 of the outer case 101 is protruded inward of the watch, and the outer peripheral edge of the solar panel support substrate 120 is fitted into the inner peripheral surface formed by the protruding tip 107 of the radio wave reflection surface 105. Thereby, no gap is generated between the radio wave reflecting surface 105 and the solar panel support substrate 120, and the antenna characteristics can be improved.

  In the first to third embodiments, the GPS wristwatch 1, 1 </ b> A, 1 </ b> B having a substantially planar plane is illustrated, and the GPS antenna 11 is formed in a ring shape according to the circular shape. However, it is not limited to this. For example, as a wristwatch with GPS, for example, there is a timepiece having a substantially square outer shape in a digital display type timepiece. In this case, the ring-shaped GPS antenna 11 may be incorporated inside, but a square-shaped GPS antenna 11A may be used in accordance with the clock shape as shown in FIG. In such a square GPS antenna 11A, the perimeter of the antenna electrode 112 can be formed longer than in the case where the ring-shaped GPS antenna 11 is incorporated in a planar square timepiece. Can be good. In addition, in the case of a planar square timepiece, by using the square GPS antenna 11A, the internal space can be used effectively, and for example, a large display for digital display can be formed.

  Furthermore, although the example in which the coupling portion 114 is formed along the inner peripheral surface of the dielectric base material 111 from the branch point 116 of the antenna main body portion 113 as the GPS antenna 11 is shown, the present invention is not limited to this. Like the GPS antenna 11B shown in FIG. 4, a branch point 116 is provided on the outer peripheral side of the antenna main body 113, extends from the branch point 116 to the outer peripheral side surface of the dielectric base 111, and coupled along the circumferential direction of the outer peripheral side surface A configuration in which the portion 114 is formed may be employed.

  Further, in each of the first to third embodiments, the GPS antenna 11 in which the single power feeding unit 115 is formed is illustrated. However, as shown in FIG. 12, the GPS antenna in which the plurality of power feeding units 115 are formed. 11C may be used. A GPS antenna 11C as shown in FIG. 12 has a ring-shaped antenna main body 113 provided with two power feeding portions 115A and 115B. Here, the power feeding unit 115A and the power feeding unit 115B are so-called orthogonal two-point power feeding, that is, the two power feeding units 115A and 115B are arranged at positions where the phase difference is 90 degrees. For such a GPS antenna 11C, two connection pins 61 are also provided for the two power supply portions 115A and 115B, and satellite signals are transmitted to the circuit board 25 from these two connection pins 61. In addition, the circuit board 25 performs the phase adjustment of these two paths and transmits a signal to the receiving unit 18 to perform the circularly polarized wave receiving process.

  Further, as the GPS antenna 11, a so-called loop antenna having a ring-shaped antenna main body 113 is illustrated, but the present invention is not limited thereto, and the antenna main body 113 may be formed in a C-shape. . Even in this case, a circularly polarized radio wave can be received by forming a branch point 116 connected to the coupling portion 114 at a position where the wavelength is 1/4 from one end of the C-shaped antenna main body. .

  Moreover, although the connection pin 61 was illustrated as a connection member which contacts the electric power feeding part 115, it is not limited to such a pin member. For example, a connection plate formed in the shape of a leaf spring may be used as the connection member. Even in such a configuration, the connection plate can be connected to the feeding point 117 with a predetermined contact pressure by the urging force of the leaf spring. .

  The GPS wristwatch 1 of the present invention is a combination watch having the hands 3 and the display 4, but is not limited thereto, and may be applied to, for example, a digital watch having only a display. Furthermore, the present invention is not limited to a wristwatch, and may be applied to various watches such as a pocket watch, and devices having an electronic watch function such as a mobile phone, a digital camera, and various portable information terminals.

In the above first to third embodiments, the GPS satellite has been described as an example of the position information satellite. However, the position information satellite of the present invention is not limited to the GPS satellite, but also Galileo (EU), GLONASS (Russia). , Another global navigation satellite system (GNSS) such as Hokuto (China), or a position information satellite that transmits satellite signals including time information such as a geostationary satellite such as SBAS or a quasi-zenith satellite.
Further, the present invention is not limited to the radio wave reception of satellite signals from such position information satellites, and can also be used as a short-range wireless reception device for a circularly polarized wireless tag using, for example, a 900 MHz band.
Furthermore, it can be used not only for receiving circularly polarized waves but also for receiving linearly polarized radio waves.

  In each of the embodiments described above, the dial ring 140 is provided as a ring member that covers the GPS antenna 11. However, the present invention is not limited thereto, and the ring member may be a member without a scale, and the inner surface is not an inclined surface but a dial. It may be a surface perpendicular to 2 or another shape. Further, the ring member is not essential to the present invention. For example, if the inner periphery of the bezel 150 protrudes inward to cover the GPS antenna 11, a separate ring member can be omitted.

In each of the embodiments described above, an example in which the metal dial 2 itself is also used as a ground plate and an example in which the solar panel support substrate 120 for a solar panel is also used as a ground plate have been described, but they are not also used as other functional members. A dedicated metal plate may be used and fitted into the inner peripheral surface of the outer case 101.
Further, the material of the conductor plate is not limited to a metal plate material, but may be a material in which a metal film is formed on the surface of a plate material made of a non-metallic material. Moreover, not only a continuous plate material, but also a metal plate material in which a plurality of small pieces are continuously formed and formed into a flat plate shape, or a substantially meshed flat plate shape may be used.

In each of the above embodiments, each member (bezel 150, cover glass 130, dial ring 140) disposed on the surface side of the dial plate 2 as the ground plate or the solar panel support substrate 120 is a synthetic resin except for the GPS antenna 11. Although electromagnetic shielding was avoided as a non-conductive material such as a material or a ceramic material, it is not essential that all parts be made of such a non-conductive material. It does not prevent the material from being used. However, since the electromagnetic shielding to the antenna increases with the increase of the metal material, care should be taken to ensure the antenna performance.
Since the pointer 3 has a small area, it may be made of metal, but the above-described non-conductive material is preferable because the influence on the antenna can be avoided.

  Furthermore, in each said embodiment, although the GPS antenna 11 was set as the structure provided with the ring-shaped dielectric base material 111, it is good also as a structure where the dielectric base material 111 is not provided, for example. That is, when receiving a circularly polarized radio wave having a sufficiently short wavelength, it is not necessary to shorten the wavelength and cause the antenna electrode 112 to receive it, and it can be directly received. In such a case, a configuration in which only the antenna electrode 112 is provided without providing the dielectric substrate 111, or a configuration in which the antenna electrode 112 is formed in an annular block body having no wavelength shortening function may be employed.

  DESCRIPTION OF SYMBOLS 1,1A, 1B ... GPS wristwatch, 2A ... Dial plate that functions as a conductor plate, 10 ... Case, 11, 11A, 11B, 11C ... GPS antenna (antenna), 18 ... Receiver, 105 ... Radio wave reflecting surface, 110 ... Movement, 111 ... Dielectric base material, 112 ... Antenna electrode, 113 ... Antenna body part, 114 ... Coupling part, 115 ... Feeding part, 116 ... Branch point, 117 ... Feeding point, 120 ... Solar panel functioning as a conductor plate Support substrate, 120A ... solar panel, 121 ... notch part functioning as a penetration part, 130, 130A ... cover glass.

Claims (4)

A movement for displaying time,
A conductive case for accommodating the movement;
Cover glass provided on the surface side of the case and covering the surface side of the movement;
A conductive conductor plate disposed between the movement and the cover glass and reflecting radio waves;
Between the conductor plate and the cover glass, an antenna disposed along the outer peripheral edge of the conductor plate,
The antenna includes an annular dielectric substrate disposed along the outer peripheral edge of the conductor plate, and a substantially annular conductive antenna electrode.
The cover glass is attached to the case, and the cover glass is formed to extend from the position where the antenna electrode is formed to the movement side ,
The case is provided with a radio wave reflecting surface that reflects a radio wave entering from the cover glass side to the antenna on at least a part of one end surface on the cover glass side that is flush with a surface that reflects the radio wave on the conductor plate. wireless function watch, characterized in that it comprises. The wireless function watch according to claim 1 ,
The said cover glass is provided with the surface part which covers the timepiece surface side, and the cylindrical side edge part formed along the outer periphery of the said surface part. Timepiece with a wireless function characterized by the above-mentioned. The wireless function watch according to claim 1 or 2 ,
The cover glass is provided on a surface portion covering the surface side of the movement and an outer peripheral portion of the surface portion in the cross-sectional view of the wireless function watch along the watch thickness direction. A fixed side end,
The wireless function watch, wherein an end surface of the side end portion is fixed to the case at a position closer to the movement side than at least an upper surface facing the surface portion of the antenna. The timepiece with a wireless function according to any one of claims 1 to 3 ,
The cover glass is attached to the case by fitting an uneven portion formed on an end surface of a side end portion of the cover glass into an uneven portion formed on an end surface of the exterior case. Clock with wireless function.

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