Patent Publication Number: US-2020301371-A1

Title: Portable radio-controlled watch

Description:
TECHNICAL FIELD 
     The present invention relates to a portable radio-controlled watch configured to receive a signal from a satellite or the like. 
     BACKGROUND ART 
     A portable radio-controlled watch configured to receive time information included in a signal transmitted from a satellite forming a global positioning system (GPS) or the like to correct the time has been put into practical use. An arrangement of an antenna for receiving radio waves and a method of feeding power to the antenna are determined so that required reception sensitivity can be obtained without impairing the function of the watch. 
     In FIGS. 3 of Patent Literature 1, there is disclosed a feed pin  44  configured to directly connect a feed part  402  mounted to an annular antenna body  40  to a circuit board  25  including a GPS reception unit  26 . The feed pin passes through a main plate  38 . 
     In FIG. 15 of Patent Literature 2, there is disclosed a coaxial pin configured to directly connect a circuit board  120  including a receiving portion to an antenna  110 . The coaxial pin includes a power feeding pin  115  and a ground pin  117  surrounding the power feeding pin  115 , and has a characteristic similar to that of a coaxial cable. The antenna  110  is created so as to operate with unbalanced feed. 
     CITATION LIST 
     Patent Literature 
     [PTL 1] JP 2014-163666 A 
     [PTL 2] JP 2015-207855 A 
     SUMMARY OF INVENTION 
     Technical Problem 
     When a pin is used to directly connect an antenna to aboard including a receiving circuit, and the antenna is mounted along an outer periphery of a watch glass, the pin is arranged right nearby a case body of the watch, and hence reception loss is increased. Meanwhile, when a coaxial pin is used to connect the antenna to the board in order to reduce the loss, the unbalanced feed is employed because of the coaxial pin, and hence it has been difficult to increase the reception sensitivity. For example, when the antenna is made compatible with the unbalanced feed, there is a problem in keeping the characteristic when a circularly polarized wave is received. Further, the coaxial pin has limitations on reducing its outer diameter in terms of its structure, and hence the design tends to be restricted. 
     The present invention has been made in view of the above-mentioned circumstances, and has an object to provide a portable radio-controlled watch having high reception sensitivity. 
     Solution to Problem 
     (1) According to one embodiment of the present invention, there is provided a portable radio-controlled watch including: an antenna electrode; a receiving circuit arranged on a circuit board; a pair of connection pins, each of which has one end contacting the antenna electrode, and which are arranged in parallel to each other; intermediate wiring, which is connected to another end of each of the pair of connection pins, and extends in a direction separating from a case body; and RF connection wiring configured to connect the intermediate wiring and the receiving circuit to each other. 
     (2) In the portable radio-controlled watch according to Item (1), the intermediate wiring includes a balun circuit, and the RF connection wiring includes a coaxial line or a coaxial pin. 
     (3) In the portable radio-controlled watch according to Item (2), the intermediate wiring is arranged on an intermediate board, which is different from the circuit board, and the balun circuit is arranged on a surface of the intermediate board on an opposite side of the antenna electrode. 
     (4) In the portable radio-controlled watch according to Item (2) or (3), a metal member is prevented from being arranged between the balun circuit and the circuit board. 
     (5) The portable radio-controlled watch according to Item (4) further includes a non-conductive spacer arranged between the balun circuit and the circuit board. 
     (6) In the portable radio-controlled watch according to any one of Items (1) to (5), the case body has a cutout in a part of the case body opposed to the intermediate wiring. 
     (7) The portable radio-controlled watch according to any one of Items (1) to (6) further includes: a watch glass, which has a back surface on which the antenna electrode is arranged; and a bezel, into which the watch glass is fitted, and which is connected to the case body, and the bezel has a cutout in an inner peripheral surface of the bezel at a position through which the pair of connection pins pass. 
     (8) The portable radio-controlled watch according to Item (7) further includes an annular packing, which is arranged between the watch glass and the bezel, and has a cutout at a position corresponding to the cutout of the bezel. 
     (9) The portable radio-controlled watch according to any one of Items (1) to (8) further includes a dial trim ring, which is arranged between the watch glass and the circuit board, and includes a fixing portion configured to fix the pair of connection pins. 
     (10) The portable radio-controlled watch according to Item (9) further includes a holding member configured to hold the pair of connection pins in parallel to each other, and the dial trim ring includes a fixing portion configured to fix the holding member. 
     Advantageous Effects of Invention 
     According to one embodiment of the present invention, the portable radio-controlled watch having high reception sensitivity can be provided. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a plan view for illustrating an example of a satellite radio-controlled wristwatch according to an embodiment of the present invention. 
         FIG. 2  is a sectional view taken along the line II-II of the satellite radio-controlled wristwatch illustrated in  FIG. 1 . 
         FIG. 3  is a plan view for illustrating a circuit board and a balun board included in the satellite radio-controlled wristwatch illustrated in  FIG. 1 . 
         FIG. 4  is a block diagram for illustrating the outline of a circuit configuration of the satellite radio-controlled wristwatch. 
         FIG. 5  is a partial enlarged view of a cross section illustrated in  FIG. 2 . 
         FIG. 6  is a partial plan view of a bezel and a dial trim ring included in the satellite radio-controlled wristwatch illustrated in  FIG. 1 . 
         FIG. 7  is a sectional view taken along the line VII-VII of the satellite radio-controlled wristwatch illustrated in  FIG. 1 . 
         FIG. 8  is a view for illustrating an example of a packing. 
         FIG. 9  is a partial enlarged view for illustrating an example of a conductive pin. 
         FIG. 10  is a partial enlarged view for illustrating another example of the conductive pin. 
         FIG. 11  is a partial sectional view for schematically illustrating another example of the satellite radio-controlled wristwatch. 
         FIG. 12  is a partial sectional view for illustrating another example of the satellite radio-controlled wristwatch. 
         FIG. 13  is a partial sectional view for illustrating another example of the satellite radio-controlled wristwatch. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Now, an embodiment of the present invention is described in detail with reference to the drawings. In the following, a satellite radio-controlled wristwatch  1  according to the embodiment of the present invention is described. The satellite radio-controlled wristwatch  1  according to this embodiment is configured to receive satellite radio waves including time information, and measure its position or correct the time counted by itself with use of the time information included in the received satellite radio waves. 
       FIG. 1  is a plan view for illustrating an example of an outer appearance of the satellite radio-controlled wristwatch  1  according to the embodiment of the present invention, and  FIG. 2  is a sectional view taken along the line II-II of the satellite radio-controlled wristwatch  1  illustrated in  FIG. 1 . As illustrated in  FIG. 1  and  FIG. 2 , the satellite radio-controlled wristwatch  1  includes a watch glass  31 , a bezel  32  for holding the watch glass  31 , a cylindrical case body  38 , and a back cover  39  mounted below the case body  38 . Those components form an outer shape of the satellite radio-controlled wristwatch  1 . The case body  38  and the bezel  32  are sandwiched between the watch glass  31  and the back cover  39 . In the following, the direction from the center of the satellite radio-controlled wristwatch  1  toward the watch glass  31  is referred to as upward, and the direction toward the back cover  39  is referred to as downward. 
     The case body  38  is made of metal, and has upper and lower holes. The bezel  32  is a ring-shaped ceramic corresponding with a shape of the upper hole of the case body  38 , and the bezel  32  is fitted into the upper hole to be connected to the case body  38 . Further, the back cover  39  is made of metal, and has a flat surface corresponding with a shape of the lower hole of the case body  38 . The back cover  39  is fitted into the lower hole. The watch glass  31  has a planar shape corresponding with a shape of an upper opening of the bezel  32 , and is fitted into the opening of the bezel  32 . The watch glass  31  and the bezel  32  are in contact with each other through intermediation of a packing  33 , and the watch glass  31  is fixed by the packing  33 . Further, the bezel  32  and the case body  38  are in contact with each other through intermediation of a packing  37 , and the bezel  32  is fixed by the packing  37 . 
     Further, the satellite radio-controlled wristwatch  1  includes antennas  10   a  and  10   b , two conductive pins  41 , a ring-shaped dial trim ring  34 , a dial plate  51 , an hour hand  52   a , a minute hand  52   b , a second hand  52   c , a solar cell  53 , a base plate  54 , a balun board  43 , a coaxial pin  45 , a circuit board  47 , and a motor  49 . Those components are arranged in a space surrounded by the watch glass  31 , the bezel  32 , the case body  38 , and the back cover  39 . 
     The antennas  10   a  and  10   b  are arranged on the lower side (back side) of the watch glass  31  so as to extend along a peripheral edge of the watch glass  31 . In the example of  FIG. 1 , each of the antennas  10   a  and  10   b  has an arc shape, and is bonded to the back side of the watch glass  31 . Each of the antennas  10   a  and  10   b  receives a satellite signal transmitted from a satellite. In this embodiment, in particular, the antennas  10   a  and  10   b  are so-called dipole antennas, and receive radio waves having a frequency of about 1.6 GHz transmitted from a global positioning system (GPS) satellite. The GPS is one type of satellite positioning system, and is implemented by a plurality of GPS satellites orbiting around the earth. 
     The two conductive pins  41  correspond to the antennas  10   a  and  10   b  on a one-by-one basis, and each of the antennas  10   a  and  10   b  is electrically connected to the balun board  43  by the corresponding conductive pin  41 . Upper ends of the two conductive pins  41  contact the antennas  10   a  and  10   b , respectively. Further, lower ends of the two conductive pins  41  are in contact with two connection terminals, respectively, which are formed on the balun board  43 . The positions of the conductive pins  41  in plan view are fixed by the dial trim ring  34 , and the two conductive pins  41  are arranged in parallel to each other. In the example of  FIG. 2 , the conductive pins  41  are fixed in holes passing through the dial trim ring  34  in the up-down direction. As viewed from the antennas  10   a  and  10   b , the conductive pins  41  extend in a direction separating from the watch glass  31 . 
       FIG. 3  is a block diagram for illustrating the outline of a circuit configuration of the satellite radio-controlled wristwatch  1 . A balun circuit  21  converts signals received by the antennas  10   a  and  10   b  in order to connect balanced antennas such as dipole antennas to the coaxial pin  45  and a receiving circuit  22 , which have an unbalanced characteristic. The receiving circuit  22  is connected to the balun circuit  21  via the coaxial pin  45 . The receiving circuit  22  decodes the signals received by the antennas  10   a  and  10   b  to output a bit string (reception data) indicating the details of a satellite signal obtained as a result of decoding. More specifically, the receiving circuit  22  includes a high frequency circuit (RF circuit) and a decoder circuit. The high frequency circuit operates at a high frequency to amplify and detect the analog signals received by the antennas  10   a  and  10   b  and convert the signals to a baseband signal. The decoder circuit decodes the baseband signal output from the high frequency circuit, and generates a bit string indicating the details of the data received from the GPS satellite to output the bit string to a control circuit  26 . 
     The control circuit  26  is a circuit configured to control various circuits and mechanisms included in the satellite radio-controlled wristwatch  1 , and includes, for example, a microcomputer, a motor drive circuit, and a real time clock (RTC). The control circuit  26  acquires the time based on the reception data or a clock output by the RTC to drive the motor  49  included in a drive mechanism  28  in accordance with the acquired time. The drive mechanism  28  includes the motor  49  being a stepper motor and a gear train. The motor  49  is mounted on a surface of the circuit board  47  on the dial plate  51  side. The gear train transmits the rotation of the motor  49  to rotate any one of the hour hand  52   a , the minute hand  52   b , and the second hand  52   c , for example. The current time is indicated in this manner. 
     Next, the arrangement of the balun circuit  21 , the receiving circuit  22 , and the like is described.  FIG. 4  is a plan view for illustrating the circuit board  47  and the balun board  43  included in the satellite radio-controlled wristwatch  1  illustrated in  FIG. 1 . The line II-II illustrated in  FIG. 4  corresponds to the cross section illustrated in  FIG. 2 . Further,  FIG. 5  is a partial enlarged view of the cross section illustrated in  FIG. 2 . The balun board  43  is arranged on the circuit board  47 . On a lower surface of the balun board  43 , the balun circuit  21  connected to the antennas  10   a  and  10   b  is arranged, and the receiving circuit  22  is arranged on the circuit board  47 . In the example of  FIG. 4 , in plan view, the receiving circuit  22  is arranged adjacent to the balun board  43 . The balun board  43  does not overlap with the motor  49  or a battery in plan view. 
     A non-conductive spacer  46  made of, for example, resin is arranged between the balun board  43  and the circuit board  47 , and an interval is maintained between the balun board  43  and the circuit board  47  by the spacer  46 . The balun board  43  and the circuit board  47  are arranged in parallel to each other. The spacer  46  is present between the balun circuit  21  and the circuit board  47 , but no metal member, for example, GND wiring, is arranged therebetween. The spacer  46  is fixed to the base plate  54 . Further, an opening  73  of a movement is present so as to be adjacent to an end portion of the balun board  43  on the case body  38  side, and the spacer  46  is not present between the balun board  43  and the case body  38 . The solar cell  53  is arranged right below the dial plate  51 , and the base plate  54  and the like are arranged between the solar cell  53  and the balun board  43  or the circuit board  47 . 
     The antennas  10   a  and  10   b  and the balun circuit  21  are connected to each other by the conductive pins  41  and intermediate wiring on the balun board  43 . The intermediate wiring is wiring extending on the balun board  43  from connection terminals for the conductive pins  41 . The intermediate wiring extends away from the case body  38  as viewed from the connection terminals. Further, the balun circuit  21  and the receiving circuit  22  are connected to each other by RF connection wiring. The RF connection wiring includes the coaxial pin  45 , wiring on the balun board  43  connecting the coaxial pin  45  and the balun circuit  21  to each other, and wiring on the circuit board  47  connecting the coaxial pin  45  and the receiving circuit  22  to each other. The coaxial pin  45  electrically connects the wiring on the balun board  43  and the wiring on the circuit board  47  to each other. The coaxial pin  45  is closer to the center of the dial plate  51  as compared to the conductive pins  41  in plan view, and is further away from the case body  38  than the conductive pins  41 . The conductive pins  41 , the intermediate wiring, the balun circuit  21 , and the RF connection wiring form a connection circuit configured to connect the antennas  10   a  and  10   b  and the receiving circuit  22  to each other. Further, the conductive pins  41  are a type of wiring connecting the antennas  10   a  and  10   b  and the balun circuit  21  to each other. 
     A coaxial line, for example, a coaxial cable, may be used instead of the coaxial pin  45 . Further, without arranging the balun circuit  21  on the balun board  43 , the conductive pins  41  and the coaxial pin  45  may be connected to each other by the intermediate wiring. Further, without providing the balun circuit  21 , there may be provided intermediate wiring, which is separated from the circuit board  47 , which is in contact with the conductive pins  41  at the position on the watch glass  31  side, and which extends to be away from the case body  38  to be connected to the circuit board  47 . 
     A metal member is prevented from being arranged in the vicinity of the conductive pins  41  as much as possible, and the intermediate wiring on the balun board  43  extends so as to separate from the metal case body  38 . Further, the coaxial pin  45  is arranged at a further inner position. In this manner, paths of the signals received by the antennas  10   a  and  10   b  are separated from the metal, to thereby reduce the influence on reception sensitivity by the metal. Further, in the example illustrated in  FIG. 5 , a reception signal is transmitted between the antennas  10   a  and  10   b  and the balun board  43  by the non-coaxial conductive pins  41 , and a reception signal is transmitted between the balun board  43  and the circuit board  47  by the coaxial pin  45 . When the conductive pins  41  are formed of coaxial pins, not only a problem in difference between balanced and unbalanced characteristics occurs, but also the design of components is more restricted due to the thick pins. In this embodiment, the non-coaxial conductive pins  41  are used to reduce the restrictions on design. Impedances of the conductive pins  41  are suitably adjusted by an interval between the two conductive pins  41 . Meanwhile, the coaxial pin  45  can reduce the influence of noise from the receiving circuit  22  and the microcomputer with the coaxial structure. As described above, different types of conductive pins are used depending on position to achieve both the sensitivity and flexibility in design. When the balun board  43  is arranged between the circuit board  47  and the dial plate  51 , an interval between the circuit board  47  and the dial plate  51  is increased, but when the motor  49  is arranged on the surface of the circuit board  47  on the dial plate  51  side, a distance between the motor  49  and the dial plate  51  can be rather reduced. 
     Further, as illustrated in  FIG. 5 , the case body  38  has a cutout  71  in a part thereof opposing to the conductive pins  41  and the intermediate wiring. With this cutout  71 , a distance between the metal case body  38  and the conductive pins  41  or the intermediate wiring is increased, and thus reduction in sensitivity due to the influence of an external metal with respect to the wiring from the antennas  10   a  and  10   b  can be suppressed. Further, in the back cover  39 , a cutout may be formed in a region  72  overlapping with the conductive pins  41  in plan view. 
     The spacer  46  between the balun board  43  and the circuit board  47  may be, for example, a dielectric having a high permittivity, for example, a ceramic. For example, a ceramic having a permittivity of from  10  to  90  can be employed as the spacer  46 . Further, the permittivity of the spacer  46  is only required to be equivalent to or larger than that of the dielectric arranged around the spacer  46 . As the spacer  46 , a resin or other dielectrics having a permittivity of 10 or less, or another material having a permittivity of 90 or more may be employed. When a substance having a high permittivity is arranged between metal and a reception signal path, an adverse effect of metal or the like with respect to the high-frequency reception signal can be suppressed. Therefore, when the spacer  46  is a dielectric, the influence on the reception signal by the metal back cover  39  or the like can be further reduced. The spacer  46  may be an integrally-molded ceramic member. Further, the spacer  46  may include a ceramic member (high dielectric member) covering the balun circuit  21  and the wiring related to the balun circuit  21  from the lower side, and a resin member fixed to the base plate  54  or the like to hold the high dielectric member. 
     Further, the bezel  32  has a cutout  42  in an inner peripheral surface thereof at a position through which the conductive pins  41  pass.  FIG. 6  is a partial plan view of the bezel  32  and the dial trim ring  34 . In plan view, the bezel  32  has a part on the outer side of the peripheral edge of the watch glass  31 , and a protruding portion  35  (see  FIG. 7 ) protruding from the outer-side part toward the inner side. The cutout  42  is formed in the protruding portion  35  in the vicinity of the conductive pins  41 . In plan view, the dial trim ring  34  is present on the inner peripheral side of the bezel  32  at the position of the cutout  42 , and two holes serving as structures for fixing the conductive pins  41  are formed in a region of the dial trim ring  34  overlapping with the cutout  42 . Further, the two conductive pins  41  are arranged so as to pass through the two holes. 
     The two conductive pins  41  may be held in parallel by a holding member fixed by the dial trim ring  34 . In this case, as the structure for fixing the conductive pins  41 , a structure (hole) for fixing the holding member is formed in the dial trim ring  34 . Further, the holding member may be created by injecting resin in a mold in which the conductive pins  41  are arranged (insert molding). Further, the two conductive pins  41  may be fixed by a structure provided on the dial plate  51 , the base plate  54 , or other members. 
     When the holes for allowing passage of the conductive pins  41  are formed in the dielectric bezel  32 , a certain thickness is required around the holes in order to ensure the strength, and hence there are restrictions on the size of the protruding portion  35  and the positions of the holes. Meanwhile, when the cutout  42  is formed in the bezel  32  and the conductive pins  41  are held by the resin dial trim ring  34 , there are less restrictions on the positions of the holes as compared to the case described above, and the holes for holding the conductive pins  41  can be made closer to the outer peripheral edge (outer side) of the watch glass  31 . As the conductive pins  41  are positioned further outward, the antennas  10   a  and  10   b  can also be mounted closer to the outer side of the watch glass  31 , and thus the antennas  10   a  and  10   b  can be made inconspicuous easily. 
       FIG. 8  is a view for illustrating an example of the packing  33 . In  FIG. 8 , for simplification of the description, only a part of the annular packing  33  is illustrated. The annular packing  33  mounted along the inner periphery of the protruding portion  35  of the bezel has a cutout  74  at a position corresponding to the cutout  42 . The cutout  74  of the packing  33  is formed at a position opposing to the conductive pins  41 , and the sectional area of the packing  33  is reduced at a position at which the cutout  74  is formed. With the cutout  74  of the packing  33 , the packing  33  can be prevented from interfering with the conductive pins  41  even when the packing  33  is pressed against the inner peripheral edge of the protruding portion  35  at the time of fitting of the watch glass  31 . 
     Next, relationships between the antennas  10   a  and  10   b  and peripheral members are described in more detail.  FIG. 7  is a sectional view taken along the line VII-VII of the satellite radio-controlled wristwatch  1  illustrated in  FIG. 1 . In  FIG. 7 , the conductive pins  41  are not present on the cross section, and are indicated by the broken line in  FIG. 7 . In  FIG. 7 , there is a certain horizontal distance from the conductive pins  41 , and hence the cutout  71  is not illustrated in the cross section of the case body  38 . 
     The bezel  32  is made of a ceramic being a dielectric, and the protruding portion  35  covers at least a part of the antennas  10   a  and  10   b  present at the peripheral edge of the watch glass  31  in plan view. The protruding portion  35  is arranged right below at least a part of the antennas  10   a  and  10   b , and has a shape of a ring with a cutout. In the example of this embodiment, the protruding portion  35  is arranged right below a part of the antennas  10   a  and  10   b  except for a part connected to the conductive pins  41 . Further, the dial trim ring  34  is made of an insulating resin, and is arranged adjacent to the inner periphery of the bezel  32 . Further, the dial trim ring  34  is also arranged below the protruding portion  35  so as to be adjacent thereto. 
     In this embodiment, the dielectric (bezel  32  in this case) below the antennas  10   a  and  10   b  provides a wavelength shortening effect, and the reduction in sensitivity by the dielectric is suppressed by directly connecting the conductive pins  41  to the antennas  10   a  and  10   b . In this manner, as compared to the case in which those configurations are not included, the satellite radio-controlled wristwatch  1  can be more thinned and have higher sensitivity. 
     Now, the conductive pins  41 , which contact the antennas  10   a  and  10   b , are described in further detail.  FIG. 9  is a partial enlarged view for illustrating an example of the conductive pin  41 . The conductive pin  41  is a so-called probe pin, and includes a cylindrical portion  411  and an end portion  412 . The end portion  412  is inserted into the cylindrical portion  411 , and a tip end of the end portion  412  is protruded from an end of the cylindrical portion  411 . Further, a spring is provided inside the cylindrical portion  411  to press the end portion  412  outward. In this manner, the electrical connection is maintained even when the arrangement between the antennas  10   a  and  10   b  and the conductive pins  41  slightly changes. In this case, the same structure as that illustrated in  FIG. 9  is provided also at an end of the conductive pin  41  on the opposite side, and the end portions  412  at both ends of the conductive pin  4   l  are movable. In this manner, the possibility of causing electrical connection failure by the problem of extension/contraction of the end portion  412  can be reduced. 
     The conductive pin  41  may have another shape.  FIG. 10  is a partial enlarged view for illustrating another example of the conductive pin  41 . In the example of  FIG. 10 , unlike the example of  FIG. 9 , a tip end of an end portion  413  is formed to have a plurality of contact points with a surface of the antenna  10   a  or  10   b  or another conductor. More specifically, in the example of  FIG. 10 , the tip end of the end portion  413  has a plurality of protrusions. In this manner, two or more contact points are provided between the tip end of the end portion  413  and another conductor, and thus the possibility of causing connection failure can be reduced. 
     In this case, the bezel  32  may include a part made of metal.  FIG. 11  is a partial sectional view for schematically illustrating another example of the satellite radio-controlled wristwatch  1 , and is a view for illustrating a cross section corresponding to  FIG. 7 . In the example of  FIG. 11 , unlike the example illustrated in  FIG. 7 , the bezel  32  includes a dielectric portion  82 , which is made of a ceramic or other dielectrics and is integrated with the dial trim ring, and a metal portion  83  made of metal. Further, the dielectric portion  82  is also integrated with an auxiliary member  84  present below. The metal portion  83  is fitted into the case body  38  to be arranged on the outer peripheral side of the bezel  32 , and includes, at a lower portion, a protruding portion  85 , which protrudes toward the inner peripheral side and has an upper surface supporting the dielectric portion  82 . The dielectric portion  82  has a ring shape, and its cross section has a rectangular part and a trapezoidal part that is connected to the rectangular part and has a slope corresponding to the dial trim ring. The rectangular part overlaps with the antennas  10   a  and  10   b  in plan view. 
     In the example of  FIG. 11 , a lower surface of a part of the watch glass  31  on the outer side of the antennas  10   a  and  10   b  is lower than a lower surface of other regions, and is in contact with an upper surface of the dielectric portion  82 . In this manner, the watch glass  31  can be mounted close to also a horizontal outer side (metal portion  83  side) of the antennas  10   a  and  10   b . Therefore, the wavelength shortening effect by the permittivity of the watch glass  31  can be increased, and the radio wave reception sensitivity can be improved. Further, the balun circuit  21  and the circuit board  47  are prevented from overlapping with each other in plan view, and hence the noise from the circuit board  47  can be prevented from entering the balun circuit  21 . 
     The auxiliary member  84  is an annular member mounted so as to cover an inner peripheral surface of the protruding portion  85 , and is present between the conductive pins  41  and the metal portion  83  of the bezel  32 . The auxiliary member  84  is a dielectric, and can reduce the influence caused by the metal portion  83  on signals flowing through the conductive pins  41 . The auxiliary member  84  may be separated from the dielectric portion  82 . Further, the auxiliary member  84  may only cover a part of the inner peripheral surface of the protruding portion  85  that is opposed to the conductive pins  41 . 
     When a part of the bezel  32  close to the antennas  10   a  and  10   b  is made of dielectrics such as a ceramic, resistance against impact of the satellite radio-controlled wristwatch  1  can be improved by the part of the bezel  32  made of metal while the satellite radio-controlled wristwatch  1  is increased in sensitivity and reduced in thickness. In particular, two characteristics of high sensitivity and impact resistance can coexist. 
       FIG. 12  is a partial sectional view for illustrating another example of the satellite radio-controlled wristwatch  1 , and is a view corresponding to  FIG. 5 . In the example of  FIG. 12 , as compared to the example of  FIG. 5 , the size of the satellite radio-controlled wristwatch  1  is increased, but a size of a movement including the circuit board  47  and the motor  49  is not changed. Ring-shaped spacers  77  and  78  are mounted between the movement and the case body  38 . The ring-shaped spacer  77  is arranged between the back cover  39  and the balun board  43  as viewed in the up-down direction, and the ring-shaped spacer  78  is arranged between the balun board  43  and the dial plate  51  as viewed in the up-down direction. The antennas  10   a  and  10   b  are mounted to the peripheral edge of the watch glass  31  as in the example of  FIG. 5 . 
     The balun board  43  extends to exceed the position corresponding to the opening  73  in  FIG. 5  to reach the vicinity of the case body  38 . On the inner side of the movement, the balun board  43  is sandwiched between spacers  46  and  76 , which overlap with the circuit board  47  in plan view. In this case, the spacer  46  is present between the balun board  43  and the circuit board  47 , and the spacer  76  is present between the balun board  43  and the dial plate  51 . Further, in plan view, a region of the balun board  43  on the case body  38  side of the circuit board  47  and the spacers  46  and  76  is fixed by the ring-shaped spacers  77  and  78 . The ring-shaped spacer  78  has holes for allowing the conductive pins  41  to pass therethrough. Further, as in the example of  FIG. 5 , the balun board  43  extends outward of the outer periphery of the circuit board  47 . 
     As illustrated in  FIG. 12 , the balun board  43  extends to the outside of the movement. Thus, even when the size of the satellite radio-controlled wristwatch  1  is increased, and the conductive pins  41  right below the antennas  10   a  and  10   b  present in the peripheral edge of the watch glass  31  do not overlap with the circuit board  47  in plan view, it is possible to respond to the change by only changing the length of the balun board  43 . In this manner, the satellite radio-controlled wristwatch  1  can be manufactured in various sizes without greatly changing the interior of the movement. Further, the ring-shaped spacers  77  and  78  are used not only for the fixation of a planar position of the movement but also for fixation of the balun board  43  in the up-down direction, and hence the structure can be simplified. The spacer  76  and the ring-shaped spacer  78  may be connected to and integrated with each other. 
       FIG. 13  is a partial sectional view for schematically illustrating another example of the satellite radio-controlled wristwatch  1 , and is a view corresponding to  FIG. 2  and  FIG. 5 . In the example of  FIG. 13 , the configuration of the part except for the circuit board  47  and the balun board  43  is the same as that in the example of  FIG. 2  and  FIG. 5 . Also in the example of  FIG. 13 , the bezel  32  has the cutout  42 , and the packing  33  has the cutout  74 . Further, the dial trim ring  34  has the structure for fixing the conductive pins  41 . Meanwhile, in the example of  FIG. 13 , the conductive pins  41  are in contact with the circuit board  47 , and the intermediate wiring and the balun circuit  21  are mounted on the circuit board  47 . Therefore, as compared to the example of  FIG. 2  and the like, the conductive pins  41  are susceptible to the case body  38 , but the cutout  71  of the case body  38  or the like can reduce the influence to obtain practical sensitivity. Also in the example of  FIG. 13 , the bezel  32 , the packing  33 , and other structures enable the conductive pins  41  to be brought closer to the peripheral edge side of the watch glass  31 , and the antennas  10   a  and  10   b  can be made inconspicuous. 
     A case, in which the present invention is applied to the satellite radio-controlled wristwatch  1 , has been described so far, but the present invention is also applicable to, for example, a portable small-sized watch that is not a wristwatch.