JP6739328B2 - Radio clock - Google Patents

Description

The present invention relates to a radio-controlled timepiece that receives a signal from a satellite or the like.

A portable radio-controlled timepiece that receives time information included in a transmission signal from a satellite or the like that constitutes a GPS (Global Positioning System) and corrects the time has been put into practical use. The type and arrangement of antennas for receiving radio waves are determined so that the function of the timepiece is not impaired and the required reception sensitivity is obtained.

Patent Document 1 discloses that an antenna is formed on the inner surface of the outer peripheral portion of a window member, and the antenna and the circuit board in the movement are electrically connected via a conductive pin.

Patent Document 2 discloses a wristwatch including an electronic device arranged on the bottom surface of a windshield, a printed circuit board separated from the electronic device, and a flange for obtaining an electrical connection between the electronic device and the printed circuit board. Has been done. In particular, FIG. 2 discloses disposing the electronic control circuit on the back side of the flange.

FIG. 2 of Patent Document 3 discloses disposing a GPS antenna including a dielectric base material and an antenna electrode in a ceramic dial ring.

FIG. 8 of Patent Document 4 discloses disposing a parasitic element 423 (antenna) on the back side of the outer peripheral edge of the windshield. The parasitic element 423 is contactlessly fed by the arc-shaped feeding element 410 formed on the dielectric. A dial ring 83, which is a dielectric, is arranged between the parasitic element 423 and the feeding element 410.

JP, 2003-315475, A Japanese Patent No. 5898717 Japanese Patent No. 5866860 JP, 2014-163666, A

The inventors of the present application are considering arranging an antenna for the UHF band having a balanced characteristic at a position close to the windshield of a portable timepiece such as a wristwatch. Here, the receiving circuit is generally made to decode a signal having an unbalanced characteristic. Therefore, in order to obtain the original performance, it is necessary to provide a balun circuit for converting a balanced reception signal into an unbalanced signal between the antenna and the reception circuit. On the other hand, in the wiring from the balun circuit and the antenna to the balun circuit, noise due to surrounding objects is likely to be mixed, and the reception sensitivity is likely to decrease.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a radio-controlled timepiece with high sensitivity.

(1) A windshield, a case in which the windshield is fitted, a movement arranged in the case, an antenna electrode arranged between the movement and the windshield, and electrically connected to the antenna electrode, A balun circuit for converting a signal from the antenna electrode into an unbalanced signal; and a plurality of dielectrics, wherein the balun circuit is disposed between the movement and the windshield, and between the plurality of dielectrics. The radio-controlled watch placed in

(2) In the radio timepiece described in (1), one of the dielectrics is a dial arranged between the windshield and the movement, and the balun circuit is covered with the dial.

(3) The radio timepiece according to (1) or (2), wherein one of the dielectrics includes a protection region that prevents the balun circuit from contacting a member facing the balun circuit.

(4) In the radio timepiece described in (3), the protection region is a notch provided in the one of the dielectrics, and the balun circuit is arranged inside the notch.

(5) In the radio timepiece described in (3), the protection area is a protrusion provided on the one surface of the dielectric material around the balun circuit.

(6) In any one of (1) to (5), one of the dielectrics is a ring provided between the movement and the windshield along the inner peripheral surface of the case in plan view, or A radio-controlled timepiece that is an arc-shaped dielectric member.

(7) In (6), the dielectric member is arcuate, and one of the dielectrics is a block to which a balun circuit is attached and which is fitted between the ends of the arcuate dielectric member. Radio clock.

(8) In the radio timepiece described in (6), the dielectric member has a notch radially inside and the balun circuit is arranged radially inside the notch.

(9) In (6), the dielectric member has an arc shape, and further includes a dielectric substrate fitted between the end portions of the arc-shaped dielectric member, and the balun circuit has a diameter of the dielectric substrate. A radio-controlled watch that is placed on the inner side of the direction.

(10) The radio timepiece according to any one of (1) to (9), further including a dial provided between the movement and the windshield, wherein the balun circuit is closer to the windshield than the dial.

According to the present invention, the radio-controlled timepiece can receive radio waves with high sensitivity.

FIG. 3 is a plan view showing an example of a satellite radio-controlled wristwatch according to the first embodiment. FIG. 2 is a sectional view taken along the line II-II of the satellite radio-controlled wristwatch shown in FIG. 1. It is a block diagram showing an example of composition of an antenna, a balun circuit, and a receiving circuit. It is a perspective view which shows roughly an example of arrangement|positioning of a balun circuit. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a perspective view which shows roughly another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing an example of a satellite radio-controlled wristwatch concerning a 2nd embodiment. It is a perspective view which shows roughly another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a fragmentary sectional view showing another example of a satellite radio-controlled wristwatch. It is a perspective view which shows roughly an example of the satellite radio-controlled wristwatch concerning 3rd Embodiment. FIG. 29 is a perspective view schematically showing the balun block shown in FIG. 28. It is a perspective view which shows roughly another example of a satellite radio-controlled wristwatch. FIG. 31 is a perspective view schematically showing the high dielectric member shown in FIG. 30. FIG. 31 is a perspective view schematically showing the balun block shown in FIG. 30. It is a perspective view which shows schematically another example of a high dielectric member. It is a perspective view which shows schematically another example of a balun block. It is a fragmentary sectional view showing other examples of a high dielectric member and a balun block. It is a perspective view which shows schematically another example of a high dielectric member. It is a top view which shows another example of a satellite radio-controlled wristwatch. It is a perspective view showing an example of a balun board. It is a top view which shows another example of a satellite radio-controlled wristwatch. It is a perspective view which shows another example of a balun board|substrate.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The satellite radio-controlled wristwatch 1 according to the embodiment of the present invention will be described below. The satellite radio-controlled wristwatch 1 according to the present embodiment receives satellite radio waves including time information, and uses the time information included in the received satellite radio waves to correct or measure the time counted by itself.

[First Embodiment]
FIG. 1 is a plan view showing an example of the external appearance of the satellite radio-controlled wristwatch 1 according to the first embodiment, and FIG. 2 is a sectional view taken along the line II-II of the satellite radio-controlled wristwatch 1 shown in FIG. .. As shown in these drawings, the satellite radio-controlled wristwatch 1 includes a windshield 31, a bezel 32 that holds the windshield 31, a cylindrical body 38, and a case back 39 provided below the body 38. .. These form the outer shape of the satellite radio-controlled wristwatch 1. The body 38 and the bezel 32 are sandwiched between the windshield 31 and the back cover 39. The body 38, the bezel 32, and the back cover 39 form an outer case of the satellite radio-controlled wristwatch 1. In the following, the direction from the center of the satellite radio-controlled wristwatch 1 toward the windshield 31 is described as up, and the direction toward the case back 39 is described as down.

The body 38 is made of metal and has a hole penetrating vertically. The bezel 32 is a ring-shaped member corresponding to the shape of the upper part of the hole of the body 38. The bezel 32 is made of metal or ceramics. The bezel 32 is connected to the body 38 by being fitted into the upper portion of the hole of the body 38. The back cover 39 is made of metal and has a flat surface corresponding to the shape of the lower part of the hole of the body 38, and the back cover 39 is fitted in the lower part of the hole. The windshield 31 has a planar shape corresponding to the shape of the upper part of the opening of the bezel 32 and is fitted into the opening of the bezel 32. The windshield 31 and the bezel 32 are in contact with each other via a packing 33, and the windshield 31 is fixed by the packing 33. The bezel 32 and the body 38 are in contact with each other via a packing 37, and the packing 37 fixes the bezel 32. Further, the windshield 31 may be fixed to the bezel 32 by caulking or bonding instead of the packing 33, although the windshield 31 has poor impact resistance and waterproofness.

Further, the satellite radio-controlled wristwatch 1 includes a blind area 61, antennas 10a and 10b, a ring-shaped dial ring 34, a high dielectric member 36, a dial 51, an hour hand 52a, a minute hand 52b and a second hand 52c, a solar cell 53, a movement 59, a balun. A circuit 21 is included. These are arranged in a space surrounded by the windshield 31, the bezel 32, the body 38, and the back cover 39. The movement 59 is arranged in the outer case and includes the date plate 55, the main plate 54, a circuit board, a drive circuit, and the like.

The antennas 10a and 10b are arranged on the lower side (back side) of the windshield 31 so as to extend along the peripheral edge of the windshield 31. In the example of FIG. 1, each of the antennas 10a and 10b has an arc shape. The antennas 10a and 10b receive satellite signals transmitted from satellites. In particular, in this embodiment, the antennas 10a and 10b are so-called dipole antennas, and receive radio waves having a frequency of about 1.6 GHz transmitted from a GPS (Global Positioning System) satellite. GPS is a kind of satellite positioning system, and is realized by a plurality of GPS satellites that orbit the earth. Further, the antennas 10a and 10b may receive radio waves transmitted from the satellites constituting the Quasi-Zenith Satellite System and GLONASS, and may also transmit and receive radio waves of approximately 2.4 GHz according to the Bluetooth (registered trademark) standard or the like. Good.

A ring-shaped blind area 61 is provided between the antennas 10a and 10b and the windshield 31 in plan view. Antennas 10a and 10b are adhered or vapor-deposited on the lower surface of the blind area 61. The blindfold area 61 is formed by, for example, printing, and the blindfold area 61 prevents the antennas 10a and 10b from being visually recognized from the front side. The blind area 61 may not be provided, and the antennas 10a and 10b may be directly bonded or vapor-deposited on the windshield 31. The dial ring 34 and the high-dielectric member 36 are ring-shaped members between the movement 59 and the windshield 31, and are provided along the inner peripheral surface of the bezel 32 or the body 38. The high dielectric member 36 may be a circular arc member.

The high dielectric member 36 has an upper surface 36a, an inclined surface 36k, a lower surface 36c, a surface connecting the inclined surface 36k and the lower surface 36c, and an outer peripheral surface 36d. The inclined surface 36k is a surface radially inward of the upper surface 36a and facing the dial plate 51. The edge on the peripheral side of the inclined surface 36k is farther from the dial 51 than the edge on the inner side in the radial direction. In the example of FIG. 2, the balun circuit 21 is provided on the upper surface 36 a of the high dielectric member 36, and the dial ring 34 covers the high dielectric member 36 and the balun circuit 21. The balun circuit 21 is arranged closer to the windshield 31 than the dial 51.

The dial ring 34 has a first portion facing the upper surface 36 a of the high dielectric member 36 and a second portion facing the inclined surface 36 k of the high dielectric member 36. The first portion of the dial ring 34 includes a lower back upper surface 34a and an upper front upper surface 34c, and the second portion includes a lower back inclined surface 34k and an upper front surface. And an inclined surface 34d.

Here, the dial ring 34 is made of resin mixed with a high dielectric material, and has a dielectric constant of about 4 to 15. The high-dielectric member 36 is a ceramic having a dielectric constant of 20 or more. The balun circuit 21 is arranged between the high dielectric member 36 and the dial 34, in other words, between the two dielectrics.

Here, the high dielectric member 36 is arranged below the antennas 10a and 10b. As a result, the wavelengths of the radio waves received by the antennas 10a and 10b are shortened, and the required radio waves can be received by the small antennas 10a and 10b. In the example of FIG. 2, the high dielectric member 36 has a ring shape, but may have an arc shape so that it exists only below the antennas 10a and 10b, for example.

The dial 51 is provided between the movement 59 and the windshield 31, and particularly between the dial ring 34 and the high dielectric member 36 and the movement 59 in the example of FIG. The solar cell 53 is provided on the lower side (back side) of the dial 51. In the example of FIG. 2, the base plate 54 is also provided directly below the dial plate 51.

FIG. 3 is a block diagram showing an example of the configurations of the antennas 10 a and 10 b, the balun circuit 21, and the receiving circuit 22. The antennas 10a and 10b are electrically connected to the balun circuit 21 via the conductive pin 41 and the connection wiring 20, respectively. Further, the balun circuit 21 is connected to the receiving circuit 22 via the connection wiring 44. The balun circuit 21 converts the balanced reception signals from the antennas 10a and 10b into unbalanced signals. The balun circuit 21 includes a coil 21a on the antenna 10a, 10b side and a coil 21b on the receiving circuit 22 side. The antenna 10a is electrically connected to one end of the coil 21a, and the antenna 10b is electrically connected to the other end of the coil 21b. One end of the coil 21b is connected to the connection wiring 44, and the other end of the coil 21b is connected to a wiring that supplies the ground potential GND of the circuit. The coils 21a and 21b convert a balanced reception signal into an unbalanced signal.

The receiving circuit 22 decodes the signals received by the antennas 10a and 10b, and outputs a bit string (received data) indicating the contents of the satellite signal obtained as a result of the decoding. More specifically, the receiving circuit 22 includes a high frequency circuit (RF circuit) and a decoding circuit. The high frequency circuit operates at a high frequency, amplifies and detects an analog signal received by the antennas 10a and 10b, and converts the analog signal into a baseband signal. The decoding circuit decodes the baseband signal output from the high frequency circuit to generate and output a bit string indicating the content of the data received from the GPS satellite.

In a circuit that handles high frequencies such as GPS reception signals, the reception sensitivity is likely to decrease due to the influence of surrounding metals and the like. In particular, the antennas 10a and 10b, the conductive pin 41, the connection wiring 20, and the balun circuit 21 are more easily affected by the surrounding metal and the like, and the reception sensitivity is likely to decrease. On the other hand, by disposing a dielectric between a wiring or circuit that handles a received signal and an object such as a metal, the influence of the metal or the like on the receiving sensitivity can be reduced. In this embodiment, as shown in FIG. 2, the balun circuit 21 is sandwiched between dielectrics, so that the receiving sensitivity can be improved. Further, by arranging the balun circuit 21 above the movement 59, the wiring from the antennas 10a and 10b to the balun circuit 21 can be shortened, noise caused by an external object can be reduced, and reception sensitivity can be improved. be able to.

Here, the movement 59 includes a control circuit and a drive mechanism (not shown). The control circuit acquires the bit string acquired from the receiving circuit 22 and controls various circuits and drive mechanisms included in the satellite radio-controlled wristwatch 1. The drive mechanism includes a motor that is a step motor and a train wheel. The rotation of the motor is transmitted by the train wheel to rotate, for example, any one of the hour hand 52a, the minute hand 52b, and the second hand 52c. As a result, the current time is displayed.

FIG. 4 is a perspective view schematically showing an example of the arrangement of the balun circuit 21. In FIG. 4, the balun circuit 21, the connection electrode 42, and the connection wiring 20 are arranged on the upper surface of the high dielectric member 36. The conductive pin 41 is arranged on the connection electrode 42, and the connection electrode 42 and the conductive pin 41 are electrically connected. The connection electrode 42 and the balun circuit 21 are electrically connected by the connection wiring 20. The wiring of the balun circuit 21 is electrically connected to the reception circuit 22 (not shown) by the connection wiring 44. In addition, a matching element may be arranged at each intermediate portion 24 of the connection wiring 20 for impedance matching.

According to FIG. 4, the lengths of the connection wiring 20 toward the antenna 10a and the connection wiring 20 toward the antenna 10b are different. As a result, in plan view, the balun circuit 21 and the connection electrodes 42 to the antennas 10a and 10b are arranged side by side in the rotation direction viewed from the center of the satellite radio-controlled wristwatch 1. Therefore, even if the width of the upper surface 36a of the high-dielectric member 36 is narrow, these can be arranged.

The conductive pin 41 is a so-called probe pin. The two conductive pins 41 have a one-to-one correspondence with the antennas 10a and 10b, and each of the antennas 10a and 10b is electrically connected to the balun circuit 21 by the corresponding conductive pin 41. At least one end of the conductive pin 41 is expanded and contracted by a spring, the upper ends of the two conductive pins 41 contact the antennas 10a and 10b, and the lower ends thereof contact the connection electrodes 42, respectively. The conductive pin 41 is fixed in position in plan view by the dial ring 34 and the like, and the two conductive pins 41 are arranged in parallel with each other. In the example of FIG. 2, the conductive pin 41 is fixed in a hole that vertically penetrates the dial ring 34. When viewed from the antennas 10a and 10b, the conductive pin 41 extends in a direction away from the windshield 31.

Here, the antenna 10a, 10b and the balun circuit 21 may be electrically connected by bringing the connection electrode 42 having a protrusion into contact with the antenna 10a, 10b without using the conductive pin 41. Further, instead of the conductive pin 41, a spring material may be used to electrically connect the antennas 10a and 10b to the balun circuit 21. By using the connection electrode 42 having a protrusion or the spring material instead of the conductive pin 41, it is possible to connect the antennas 10a and 10b to the connection electrode 42 even if the distance between them is smaller.

Here, the balun circuit 21 does not necessarily have to be arranged on the upper surface 36 a of the high dielectric member 36. FIG. 5 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1. In the example of FIG. 5, the bezel 32, the body 38, the dial 51, etc. are omitted. In the example of FIG. 5, unlike the example of FIG. 2, the balun circuit 21 is arranged on the inclined surface 36k of the high dielectric member 36, and is arranged between the high dielectric member 36 and the dial ring 34. ..

FIG. 6 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. In the example of FIG. 6, the balun circuit 21 is arranged on the back side upper surface 34 a of the dial ring 34 and faces the upper surface 36 a of the high dielectric member 36.

FIG. 7 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. In the example of FIG. 7, the balun circuit 21 is arranged on the back side inclined surface 34k of the dial ring 34 and faces the inclined surface 36k of the high dielectric member 36.

Further, the antennas 10a and 10b do not necessarily have to be arranged on the back surface of the windshield 31. FIG. 8 is a perspective view schematically showing another example of the satellite radio-controlled wristwatch 1. In the example of FIG. 8, the antennas 10a and 10b are arranged on the upper surface 36a of the high dielectric member 36, and the balun circuit 21 and the antennas 10a and 10b are electrically connected by the connection wiring 20 on the upper surface 36a of the high dielectric member 36. ..

Further, the balun circuit 21 does not necessarily have to be arranged between the high dielectric member 36 and the dial ring 34. FIG. 9 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. In the example of FIG. 9, the balun circuit 21 is arranged on the upper surface 36 a, but the dial ring 34 does not cover the balun circuit 21. However, the balun circuit 21 is arranged between the high dielectric member 36 and the windshield 31. Here, the windshield 31 has a dielectric constant of about 5 to 10 and can be said to be a dielectric. In the example of FIG. 9 also, the balun circuit 21 is sandwiched between the dielectrics, so that the effect of surrounding metals and the like can be reduced and the effect of improving the receiving sensitivity can be obtained, though not to the extent of other examples.

FIG. 10 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. 9. FIG. 10 also shows a dial 51 and a movement 59. The balun circuit 21 is arranged on the lower surface 36c of the high dielectric member 36, and is arranged between the high dielectric member 36 and the dial plate 51. Here, the dial plate 51 is made of, for example, a resin containing a high dielectric, and has a dielectric constant of about 4 to 15. Also in the example of FIG. 10, since the balun circuit 21 is sandwiched between the high dielectric materials, the effect of improving the receiving sensitivity can be obtained. Further, a base plate 54 made of resin having a high dielectric constant (dielectric constant of about 4 to 15) is arranged in a portion of the movement 59 facing the balun circuit 21, and the balun circuit 21 is connected to the base plate 54 and the high dielectric member 36. May be sandwiched.

FIG. 11 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. 10. The balun circuit 21 is arranged on the outer peripheral surface 36d of the high dielectric member 36. In the example of FIG. 10, the balun circuit 21 is sandwiched between the dial ring 34 and the dial plate 51, which are the high dielectric material above and below.

FIG. 12 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. 11. In the example of FIG. 12, the bezel 32 that is a part of the outer case is described. In the example of FIG. 12, the bezel 32 is ceramics and has a dielectric constant of 20 or more. Also in the example of FIG. 12, the balun circuit 21 is arranged on the outer peripheral surface 36d of the high dielectric member 36. The balun circuit 21 is sandwiched between the bezel 32 which is a high dielectric material and the high dielectric member 36.

[Second Embodiment]
Next, a satellite radio-controlled wristwatch 1 according to a second embodiment of the present invention will be described. In the second embodiment, the dielectric such as the high-dielectric member 36 and the dial ring 34 has a protective portion for preventing the balun circuit 21 from coming into contact with a member facing the balun circuit 21. The protective portion is, for example, a notch or a protrusion. In the following, differences between the first embodiment and the second embodiment will be mainly described, and description of common points will be omitted.

FIG. 13 is a partial cross-sectional view showing an example of the satellite radio-controlled wristwatch 1 according to the second embodiment. 13, the outer case, the dial plate 51, and the movement 59 are not shown as in FIG. 5, but they are actually present.

In the example of FIG. 13, a cutout 71a is provided in the upper surface 36a of the high dielectric member 36, and the balun circuit 21 is arranged at the bottom of the cutout 71a. The upper surface of the balun circuit 21 is lower than the upper ends of the side surfaces of the cutout 71a. Accordingly, even if the high dielectric member 36 and the dial ring 34 come into contact with each other due to an impact or the like, it is possible to prevent the dial ring 34 from coming into contact with the balun circuit 21. The balun circuit 21 is arranged between the high-dielectric member 36 and the dial ring 34, and is sandwiched between the side walls of the notch 71a, which is a high-dielectric material, facing each other.

FIG. 14 is a perspective view schematically showing another example of the satellite radio-controlled wristwatch 1, particularly a structure of the high dielectric member 36. In the example of this figure, unlike the example of FIG. 13, the notch 71b of the high dielectric member 36 is U-shaped, and the inclined surface 36k and part of the outer peripheral surface 36d are also notched. In the example of FIG. 14, the connection electrode 42 for electrically connecting to the antennas 10a and 10b is provided on the upper surface 36a, and the balun circuit 21 and the connection electrode 42 arranged at the bottom of the cutout 71b are connected to the upper surface and the disconnection electrode. It is electrically connected by the connection wiring 20 provided on the side wall of the notch 71b.

FIG. 15 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. 7. In the example of FIG. 15, a cutout 71k is provided on the inclined surface 36k of the high dielectric member 36, and the balun circuit 21 is provided at the bottom of the cutout 71k. Also in the example of FIG. 15, the upper surface of the balun circuit 21 does not extend outside from the inclined surface 36k, and the balun circuit 21 and the dial ring 34 do not collide with each other due to a shock or the like. A cutout may be provided in the outer peripheral surface 36d of the high dielectric member 36, and the balun circuit 21 may be provided in the cutout.

FIG. 16 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. 9. In FIG. 16, the dial 51 and the movement 59 are also shown. In the example of FIG. 16, a notch 71c is provided on the lower surface 36c of the high dielectric member 36, and the balun circuit 21 is provided at the upper end of the notch 71c. In the example of FIG. 16, the lower surface of the balun circuit 21 does not extend outside from the lower surface 36c of the high dielectric member 36, and the balun circuit 21 and the dial plate 51 do not collide with each other due to a shock or the like.

FIG. 17 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. 13. In the example of FIG. 17, the notch 71a is provided on the upper surface 36a of the high dielectric member 36 as in the example of FIG. 13, but the balun circuit 21 is not the bottom of the notch 71a, but the dial ring facing the notch 71a. It is provided on the back side upper surface 34a of 34. In the example of FIG. 17, the size of the balun circuit 21 is smaller than the notch 71a, and the balun circuit 21 and the high dielectric member 36 do not collide with each other due to an impact or the like.

FIG. 18 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. The example of FIG. 18 is different from the example of FIG. 17 in that the notch 72a is provided in the back side upper surface 34a of the dial ring 34, and the balun circuit 21 is provided in a region of the upper surface 36a of the high dielectric member 36 facing the notch 72a. Has been. Also in the example of FIG. 18, the size of the balun circuit 21 is smaller than the notch 72a, and the balun circuit 21 and the dial ring 34 do not collide with each other due to an impact or the like. In the example of FIG. 18, the balun circuit 21 may be provided on the upper surface of the cutout 72a of the dial ring 34.

FIG. 19 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. 10. In the example of FIG. 19, the dial plate 51 faces the lower surface 36c of the high dielectric member 36. A balun circuit 21 is provided on the lower surface 36c of the high dielectric member 36, and a notch 73 penetrating the dial plate 51 is provided in a portion of the dial plate 51 facing the balun circuit 21. The notch 73 can reduce the possibility of collision between the balun circuit 21 and the dial plate 51.

20 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. 19. In the example of FIG. 20, unlike the example of FIG. 19, the dial plate 51 exists inside the high dielectric member 36 in the radial direction and does not face the lower surface 36c of the high dielectric member 36. In the example of FIG. 20, the lower surface 36c of the high dielectric member 36 faces the movement 59. The balun circuit 21 is provided on the lower surface 36c of the high dielectric member 36, and a notch 74 is provided in a portion of the movement 59 facing the balun circuit 21. The size of the balun circuit 21 is smaller than that of the notch 74, and the balun circuit 21 and the movement 59 do not collide with each other due to an impact or the like. Further, a base plate 54 made of a resin having a high dielectric constant (dielectric constant of about 4 to 15) is arranged in a portion of the movement 59 facing the balun circuit 21, and the balun circuit 21 is connected to the base plate 54 and the high dielectric member 36. It is sandwiched.

Next, an example in which a protrusion is used instead of the notch will be described. FIG. 21 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. 13. In the example of FIG. 21, the balun circuit 21 is arranged on the upper surface 36 a of the high dielectric member 36, and a plurality of protrusions 76 extending around the balun circuit 21 to a position higher than the upper surface of the balun circuit 21 are arranged. The number of protrusions 76 is, for example, 2 to 4. As a result, it is possible to prevent the balun circuit 21 and the dial ring 34 from colliding with each other even if an impact is applied to the satellite radio-controlled wristwatch 1.

FIG. 22 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. In the example of FIG. 22, the projection 77 is provided around the back surface 34 a of the dial ring 34 and around the balun circuit 21 in plan view, and the length of the projection 77 is larger than the thickness of the balun circuit 21. This can prevent the balun circuit 21 from colliding with the dial ring 34.

23 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. 19. Unlike the example of FIG. 19, the example of FIG. 23 has a protrusion 78 provided on the dial plate 51 and around the balun circuit 21 in plan view, instead of the notch 73. Thereby, the collision between the balun circuit 21 and the dial plate 51 can be prevented.

FIG. 24 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. In the example of FIG. 24, unlike the example of FIG. 20, instead of the notch 74, a protrusion 78b is provided on the movement 59 and around the balun circuit 21 in plan view. As a result, the collision between the balun circuit 21 and the movement 59 can be prevented.

The balun circuit 21 may be arranged between the dial ring 34 and the windshield 31. FIG. 25 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. 13. In the example of FIG. 25, the cutout 72b is provided on the front side upper surface 34c of the dial ring 34, and the balun circuit 21 is provided in the region on the back side of the windshield 31 facing the cutout 72b. The size of the balun circuit 21 is smaller than the notch 72b, and the balun circuit 21 and the dial ring 34 do not collide with each other due to an impact or the like. In the example of FIG. 25, the balun circuit 21 is sandwiched between the side walls of the dial ring 34, which is a high dielectric material.

FIG. 26 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. 25. In the example of FIG. 26, unlike the example of FIG. 25, the notch 72c is provided on the front side upper surface 34c of the dial ring 34, and the balun circuit 21 is provided at the bottom of the notch 72c. The antenna 10a is provided so as to face the balun circuit 21.

The cross-sectional shape of the high dielectric member 36 may be L-shaped. FIG. 27 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. 13. In the example of FIG. 27, the high dielectric member 36 extends along the inner peripheral surface of a case (not shown) and has a rectangular upright portion 36i whose cross-sectional shape extends in the vertical direction, and a radially inner side from the lower end of the first portion. And a flange portion 36j extending to. The balun circuit 21 is provided on the upper surface of the flange portion 36j. In the example of FIG. 27, the place where the balun circuit 21 is arranged is on the lower side as compared with the other examples. The width of the dial ring 34 at the lower end is larger than the width W1 of the upper surface of the dial ring 34 in plan view. Therefore, the space for disposing the balun circuit 21 can be made wider.

[Third Embodiment]
Next, a satellite radio-controlled wristwatch 1 according to a third embodiment of the present invention will be described. In the third embodiment, the high dielectric member 36 is mainly arcuate, and the balun block 81 or the balun substrate 43 is fitted between the end portions of the high dielectric member 36. In the following, differences between the first embodiment and the second embodiment will be mainly described, and description of common points will be omitted.

FIG. 28 is a perspective view schematically showing an example of the satellite radio-controlled wristwatch 1 according to the third embodiment. FIG. 29 is a perspective view schematically showing the balun block 81 shown in FIG. 28. 28 is similar to the high dielectric member 36 shown in FIG. 14 in the first embodiment, but in the example of FIG. 28, the balun block 81 and the high dielectric member 36 are separated. The balun block 81 is fitted between the end portions of the high dielectric member 36. On the upper surface of the balun block 81, the balun circuit 21, the connection electrode 42 for connecting to the conductive pin 41, the connection wiring 20 connecting the connection electrode 42 and the balun circuit 21, the balun circuit 21, and the reception circuit 22. And a connection wiring 44 for electrically connecting to each other. The connection wiring 44 extends to the lower surface 36 c of the high dielectric member 36 via the radially inner side surface of the balun block 81. The balun block 81 is formed of a material having a high dielectric constant such as ceramics like the high dielectric member 36.

In the examples of FIGS. 28 and 29, the circuits such as the balun circuit 21 may be formed on the balun block 81 having a substantially rectangular shape in plan view, which facilitates manufacturing.

FIG. 30 is a perspective view schematically showing another example of the satellite radio-controlled wristwatch 1. In the example of FIG. 30, unlike the examples of FIGS. 28 and 29, the antennas 10a and 10b are provided on the upper surface 36a of the high dielectric member 36 instead of the absence of the conductive pin 41. The connection wiring 20 on the upper surface of the balun block 81 and the antennas 10 a and 10 b are connected by solder 83.

31 is a perspective view schematically showing the high-dielectric member 36 shown in FIG. 30, and FIG. 32 is a perspective view schematically showing the balun block 81 shown in FIG. The high dielectric member 36 has an arc shape in which a part (notch 79a) of the ring is notched. Each of the antennas 10a and 10b extends in an arc shape on the upper surface 36a of the high dielectric member 36 from the end portion adjacent to the cutout 79a. Further, the antennas 10a and 10b have end side surfaces extending from the upper surface 36a toward the lower surface 36c. The balun block 81 has a shape matching the cutout 79 a, and the upper surface thereof is lower than the upper surface 36 a of the high dielectric member 36. Further, it has an inclined surface corresponding to the inclined surface 36k. The balun circuit 21 is arranged on the upper surface of the balun block 81, and the connection wiring 20 extends from the balun circuit 21 through the upper surface to the side surface facing the side surface of the end of the high dielectric member 36. The connection wiring 20 and the antennas 10a and 10b are electrically connected by physically contacting each other on their side surfaces. In the example of FIG. 31, the connection wiring 20 and the antennas 10a and 10b are more reliably electrically conducted by the solder 83.

You may form the support part 36s which supports the balun block 81 from below in the high dielectric member 36. FIG. 33 is a perspective view schematically showing another example of the high dielectric member 36, and FIG. 34 is a perspective view schematically showing another example of the balun block 81. FIG. 35 is a partial cross-sectional view showing another example of the high dielectric member 36 and the balun block 81.

In the example of FIGS. 33 to 35, the high dielectric member 36 has an arc shape in which a notch 79b is notched in the ring. Further, the end portion of the high dielectric member 36 has a first side surface extending downward from the upper surface 36a and a support portion 36s extending from the lower end of the side surface toward the other end portion. The upper surface of the support portion 36s is connected to the first side surface, and the lower surface of the support portion 36s is connected to the lower surface 36c. The upper surface and the lower surface of the support portion 36s are connected via the second side surface. The antennas 10a and 10b include arc-shaped wiring extending from the end of the upper surface 36a of the high dielectric member 36, and the antennas 10a and 10b extend to the upper surface of the support portion 36s via the first side surface.

The balun block 81 shown in FIG. 34 is a lower surface whose upper surface in FIG. 34 contacts the supporting portion 36s. On the lower surface of the balun block 81, the balun circuit 21 and the connection wiring 44 connected to the balun circuit 21 are provided in the central region that does not contact the supporting portion 36s. Further, on the lower surface of the balun block 81, the connection wiring 20 extends from the balun circuit 21 to a region on the support portion 36s facing the antennas 10a and 10b.

As shown in FIG. 35, the balun block 81 shown in FIG. 34 is turned upside down and fitted into the high dielectric member 36. An elastic member 84 is provided between the balun block 81 and the dial ring 34, and the antennas 10a and 10b and the connection wiring 20 are always in contact with each other by the force from the dial ring 34 toward the movement 59.

FIG. 36 is a perspective view schematically showing another example of the high dielectric member 36, and is a view corresponding to FIG. 33. In the example of FIG. 36, unlike the example of FIG. 33, the notch 79c extends radially inward from the outer peripheral surface 36d of the high dielectric member 36, but the notch 79c does not reach the inclined surface 36k in a plan view. .. The high dielectric member 36 has an annular shape.

Alternatively, the notch 71f may be provided on the radially inner side of the high-dielectric member 36, and the balun circuit 21 may be arranged along the radially inner surface of the notch 71f. FIG. 37 is a plan view showing another example of the satellite radio-controlled wristwatch 1, and is a view showing the shape of the satellite radio-controlled wristwatch 1 cut at a position slightly above the lower end of the high dielectric member 36. FIG. 37 shows the high dielectric member 36, the dial ring 34, the balun substrate 43, and the balun circuit 21. A notch 71f is provided on the radially inner side of the high-dielectric member 36, and the balun substrate 43 faces the radially inner surface of the notch 71f. The balun circuit 21 is arranged between the dial ring 34 and the radially inner surface of the notch 71f. Here, the dial ring 34 may be arranged so as to cover the high dielectric material 36. Further, when the antenna electrodes 10 a and 10 b are arranged on the back surface of the windshield 31, a part of the dial ring 34 may be cut out. The notched portion may be between the antenna electrodes 10a and 10b and the connection electrode 42, and may be only a portion required for electrical connection between them. On the other hand, when the antennas 10a and 10b are on the surface of the high dielectric material 36, the dial ring 34 may cover all surfaces of the high dielectric material 36 except the outer peripheral surface and the dial plate 51 side surface.

FIG. 38 is a perspective view showing an example of the balun substrate 43. The balun circuit 21 is arranged on the radially inner surface (upper surface in FIG. 38) of the balun substrate 43. The balun circuit 21 is
Further, a connection wiring 44 extending downward from the balun circuit 21 and a connection wiring 20 extending upward are arranged on the radially inner surface. The connection wiring 20 is electrically connected to the antennas 10a and 10b. In the examples shown in FIGS. 37 and 38, the position of the balun circuit 21 can easily be brought close to the antennas 10a and 10b, and the influence of noise can be reduced.

FIG. 39 is a plan view showing another example of the satellite radio-controlled wristwatch 1 and corresponds to FIG. 37. In the example of FIG. 39, unlike the example of FIG. 37, the high-dielectric-constant member 36 has a shape in which a notch 79d is cut out in the ring, and is in an arc shape. In the example of FIG. 39, the balun substrate 43 is made of a high dielectric constant material such as ceramics like the high dielectric member 36, and is fitted between the end portions of the high dielectric member 36. The balun substrate 43 has a plate shape and faces the inner peripheral surface of the case. The balun circuit 21 is arranged on the radially inner surface of the balun substrate 43. In the example of FIG. 39 as well, similar to the example of FIG. 37, the dial ring 34 may be arranged so as to cover the high dielectric material 36. A part of the dial ring 34 may be cut out, or the dial ring 34 may cover all the surfaces of the high dielectric material 36 except the outer peripheral surface and the dial plate 51 side surface.

The receiving circuit 22 may be arranged on the balun substrate 43 or the balun block 81. FIG. 40 is a perspective view showing another example of the balun substrate 43. In the example of FIG. 40, the balun circuit 21 is provided on the side closer to the windshield 31 on the radially inner surface (upper surface of FIG. 40) of the balun substrate 43, and the receiving circuit 22 is provided on the side closer to the movement 59. Has been. The reception circuit 22 and the balun circuit 21 are electrically connected by a connection wiring 44, and the connection wiring 20 extends from the balun circuit 21 toward the upper surface of the balun circuit 21. A signal line 46 electrically connected to the control circuit, a power supply line 47 to which a power supply voltage is supplied, and a wiring 48 to which a ground potential is supplied are also connected to the reception circuit 22. The receiving circuit 22 can be arranged above the movement 59, and the satellite radio-controlled wristwatch 1 can be made smaller. Here, the receiving circuit 22 includes an amplifier, a filter, a data processing unit, and the like. The amplifier is a so-called LNA (low noise amplifier) or the like, and is connected to the connection wiring 44 from the balun circuit 21. The signal output from the amplifier is input to the filter via the wiring. The data processing unit is composed of a control IC (integrated circuit), TCXO, flash memory, etc., and is electrically connected to the output of the filter. In the balun substrate 43 and the balun block 81, all of the amplifiers, filters, data processing units, etc. included in the receiving circuit 22 may be arranged, or some of them may be arranged. For example, only the amplifier may be arranged on the balun substrate 43 or the balun block 81. Further, a circuit different from that described so far may be arranged on the balun substrate 43 or the balun block 81.

The case where the present invention is applied to the satellite radio-controlled wristwatch 1 has been described so far, but the present invention can also be applied to a portable small timepiece different from a wristwatch, for example.

1 satellite radio wristwatch, 10a, 10b antenna, 20, 44 connection wiring, 21 balun circuit, 21a, 21b coil, 22 receiving circuit, 24 middle part, 31 windshield, 32 bezel, 33, 37 packing, 34 dial ring, 34a Back side upper surface, 34k Back side inclined surface, 34c Front side upper surface, 34d Front side inclined surface, 36 High-dielectric member, 36a Upper surface, 36k Inclined surface, 36c Lower surface, 36d Outer peripheral surface, 36i Standing section, 36j Flange section, 36s Support section, 38 Body , 39 back cover, 41 conductive pin, 42 connecting electrode, 43 balun substrate, 46 signal line, 47 power line, 48 wiring, 51 dial, 52a hour hand, 52b minute hand, 52c second hand, 53 solar cell, 54 main plate, 55 days Plate, 59 movement, 61 blindfold area, 71a, 71b, 71k, 71c, 71f, 72a, 72b, 72c, 73, 74, 79a, 79b, 79c, 79d notch, 76, 77, 78, 78b protrusion, 81 Balun block, 83 solder, 84 elastic member.

Claims (10)

With the windshield
A case in which the windshield is fitted,
A movement arranged in the case,
An antenna electrode arranged between the movement and the windshield,
A balun circuit that is electrically connected to the antenna electrode and converts a signal from the antenna electrode into an unbalanced signal,
Multiple dielectrics,
Including
The balun circuit is arranged between the movement and the windshield, and is arranged between the plurality of dielectrics.
Radio clock. In the radio timepiece according to claim 1,
One of the dielectrics is a veneer disposed between the windshield and the movement,
The balun circuit is covered by the veneer,
Radio clock. In the radio timepiece according to claim 1 or 2,
One of the dielectrics includes a protective region that prevents the balun circuit from contacting a member facing the balun circuit.
Radio clock. In the radio timepiece according to claim 3,
The protective region is a notch provided in the one of the dielectrics,
The balun circuit is disposed inside the notch,
Radio clock. In the radio timepiece according to claim 3,
The protective region is a protrusion provided around the balun circuit on the one surface of the dielectric.
Radio clock. The radio-controlled timepiece according to any one of claims 1 to 5,
One of the dielectrics is a ring-shaped or arc-shaped dielectric member that is provided between the movement and the windshield along the inner peripheral surface of the case in a plan view.
Radio clock. In the radio timepiece according to claim 6,
The dielectric member is arc-shaped,
One of the dielectrics is a block to which a balun circuit is attached and which is fitted between the ends of the arc-shaped dielectric member.
Radio clock. In the radio timepiece according to claim 6,
The dielectric member has a notch on the inside in the radial direction,
The balun circuit is arranged inside the notch in the radial direction,
Radio clock. In the radio timepiece according to claim 6,
The dielectric member is arc-shaped,
Further comprising a dielectric substrate fitted between the ends of the arc-shaped dielectric member,
The balun circuit is arranged on a surface of the dielectric substrate on the radially inner side,
Radio clock. The radio timepiece according to any one of claims 1 to 9,
Further comprising a dial provided between the movement and the windshield,
The balun circuit is closer to the windshield than the dial,
Radio clock.

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