JP2007285811A - Radio wave timepiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio wave timepiece for improving the reception sensitivity of an antenna. <P>SOLUTION: The radio wave timepiece 1 has the high-frequency reception antenna 24 disposed within a timepiece case 10 and provided with an antenna core 25 and an antenna coil 26. The antenna core 25 has a core body 27 extended along an extended face of a timepiece body, and a core end 29 provided with tips 37, 38 communicated with at least one end of the core body 27, and extended in the direction intersecting the extended direction of the core body 27 and the thickness direction of the timepiece. The tip 37 of the core end 29 has a tip section extended to the vicinity of a back lid toward the back lid 20 comprising a nonmagnetic/nonconductive material, and faces the back lid 20 at an end face 42 of the tip section. The tip 38 of the core end 29 has a tip section extended to the vicinity of a dial ring 17 toward a timepiece glass 12 comprising a nonmagnetic/nonconductive material, and faces the dial ring 17 at an end face 44 of the tip section. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a radio timepiece, and more particularly to a small radio timepiece such as a wristwatch.

  A radio wave clock (radio wave correction clock) that receives a standard radio wave in the form of a long wave including time information and corrects the display time is well known.

  In a small radio-controlled timepiece such as a wristwatch, while satisfying the request to make the antenna as large as possible in order to increase the reception sensitivity, it satisfies the request to avoid the influence of the watch case when the watch case is made of metal. Accordingly, it has been proposed to arrange the antenna in a circular arc shape with a certain distance from the metal case (for example, Patent Document 1).

  However, the proposed radio timepiece does not consider the possibility of improving the reception sensitivity using the thickness direction of the timepiece.

  On the other hand, when a metal dial is used in consideration of the appearance, an opening is formed in the dial and the tip of the arc-shaped antenna core of the receiving antenna is provided in the opening in order to suppress a decrease in reception sensitivity due to the dial. It has also been proposed that the portions face each other and the opening of the dial is hidden by a dial ring made of resin or the like (Patent Document 2).

However, even in this proposed radio timepiece, there is a possibility that the detection of the standard radio wave by the tip of the antenna core cannot be sufficiently prevented from being disturbed by the metal dial.
Japanese Patent Laid-Open No. 2005-62161 JP 2005-164273 A

  The present invention has been made in view of the above points, and an object of the present invention is to provide a radio-controlled timepiece that can increase the receiving sensitivity of an antenna.

  In order to achieve the above object, the radio timepiece of the present invention is a radio timepiece having a high frequency receiving antenna having an antenna core and an antenna coil in a watch case, and the antenna core extends along the extending surface of the watch body. A core end including an extended core main body, and a tip connected to at least one end of the core main body and extending in the thickness direction of the watch in a direction intersecting the extending direction of the core main body And have. In this case, the tip end portion of the core end portion may be regarded as being thicker in the thickness direction of the watch than the core main body portion.

  In the radio-controlled timepiece of the present invention, “the antenna core is connected to the core main body portion extending along the extending surface of the timepiece main body, and is connected to at least one end of the core main body portion with respect to the extending direction of the core main body portion. Core end portion having a tip portion extending in the thickness direction of the watch in a direction intersecting with each other '', the tip end portion of the core end portion can be positioned close to the surface in the thickness direction of the watch body. The detection sensitivity of the magnetic field component of the standard radio wave can be increased.

  In the radio-controlled timepiece according to the present invention, typically, the antenna core is connected to both ends of the core main body and extends in a direction crossing the extending direction of the core main body and in the thickness direction of the timepiece. It has a core end with a tip.

  In this case, the tip connected to both ends of the core body and extending in the thickness direction of the watch in the direction intersecting the extending direction of the core body is close to the surface of the watch body in the thickness direction. Therefore, the detection sensitivity of the magnetic field component of the standard radio wave can be increased.

  In the radio timepiece of the present invention, typically, the tip end portion of the core has a tip portion extending to the vicinity of the back cover toward the back cover made of a nonmagnetic non-conductive material. The end face faces the back cover. Here, although the entire back cover may be made of a non-magnetic non-conductive material, typically, for example, the body portion of the back cover is made of a non-magnetic non-conductive material instead. A metal ring-like portion is integrally attached to the outer periphery of the lid main body portion, whereby a back lid structure is formed. In that case, the tip of the core end faces the body portion of the back cover at the end face.

  In this case, since the back cover does not actually interfere with the propagation of radio waves, with regard to the reception of radio waves, the tip part located in the vicinity of the back cover of the tip part of the core end part is actually protruding and exposed on the back cover side. Therefore, the reception sensitivity can be increased.

  In the radio timepiece of the present invention, the back cover is typically made of glass. In this case, for example, the inside can be visually recognized from the back cover side.

  In the radio timepiece of the present invention, typically, the tip of the core end has a tip portion extending to the vicinity of the dial ring toward the watch glass made of a nonmagnetic non-conductive material, and the end face of the tip portion Is facing the dial ring.

  In this case, since the dial ring does not actually interfere with the propagation of radio waves, with regard to the reception of radio waves, the tip part located near the dial ring among the tip parts of the core end part actually protrudes and is exposed on the back cover side. Therefore, the reception sensitivity can be increased.

  In the radio timepiece of the present invention, typically, the dial located on the back side of the dial ring has a hole, and the tip of the tip of the core end is loosely fitted in the hole of the dial. In this case, since the dial can be made of metal, a high-grade appearance can be maintained.

  In the radio timepiece of the present invention, the antenna core is typically curved in an arc shape along the curvature of the inner surface of the case (typically in an arc shape concentric with the inner peripheral surface of the case having a circular cross section). is doing. In this case, the antenna core can be made as long as possible, so that reception sensitivity can be increased. Further, even if the watch case (the body) is made of metal, the inhibition of reception of the standard radio wave by the case can be minimized.

  The radio timepiece of the present invention typically includes a laminate of a plurality of soft magnetic thin plates in which antenna cores are laminated in the radial direction. In this case, the magnetic flux passing through the antenna core is easily bent in the thickness direction of the watch through the core according to the bending in the watch thickness direction at the end of the core, and the leakage of the magnetic flux can be minimized. Reception sensitivity can be increased. The soft magnetic plates typically have the same shape and size. However, if desired, the outer peripheral side may be slightly longer or shorter.

  In this case, the soft magnetic thin plates laminated in this case typically have a watch in a direction intersecting with the core end portion so as to form a core end portion at both ends in the longitudinal direction of the main body portion. However, if desired, the portion that should be the tip extending in the direction crossing the longitudinal direction and the thickness direction of the watch is only on one end side in the longitudinal direction. You may have. In that case, for example, a tip extending in a direction intersecting with the extending direction of the core main body at both ends by stacking the half of the multiple soft magnetic thin plates to be stacked by inverting in the longitudinal direction. A core end with a portion may be formed at both ends.

  In the radio timepiece of the present invention, typically, the end surface of the tip of the antenna core that intersects the circumferential direction is inclined with respect to the radial direction of the timepiece by an angle θ (where θ> 0). The case is opposed to the inner peripheral surface at a distance from the inner peripheral surface of the case.

  In this case, even if the watch case is made of metal, it is easy to minimize the inhibition of reception of standard radio waves by the case.

  In the radio timepiece of the present invention, the interval is typically 2 mm or more. In this case, it is easy to maintain high radio wave reception sensitivity.

  A preferred embodiment of the present invention will be described based on a preferred embodiment shown in the accompanying drawings.

  FIGS. 1 and 2 show a radio timepiece according to a preferred embodiment of the present invention. FIGS. 3A and 3B show standard radio wave receptions of the radio timepieces shown in FIGS. A mechanism, a clock train driving pulse generation mechanism and an electronic time correction mechanism are shown.

  A radio-controlled timepiece (radio-corrected timepiece) 1 shown in FIGS. 1 and 2 has a substantially annular watch case or barrel 10 on the outside, and a watch glass 12 fitted in a front-side opening 11 of the barrel 10; A back cover structure 14 screwed into the back side opening 13 of the barrel 10. Hereinafter, the thickness direction of the timepiece 1 is assumed to be the Z direction. The watch glass 12 and the back cover structure 14 extend along a plane perpendicular to the Z direction. Accordingly, the watch body also extends along a plane perpendicular to the Z direction.

  A metal dial 16 is arranged inside the watch glass 12 with a rotation area 15 of a time display indicator (not shown) interposed therebetween, and a resin dial ring is interposed between the dial 16 and the watch glass 12. 17 is arranged. The dial ring 17 is non-conductive and non-magnetic. Openings 18 and 18 (one is not displayed) are formed in a region hidden behind the dial ring 17 in the dial 16.

  The back cover structure 14 includes a metal outer peripheral ring-shaped portion 19 and a back cover glass 20 as a back cover main body fixed to the ring-shaped portion 19. The back glass 20 is non-conductive and non-magnetic.

  The main parts of the timepiece 1 are arranged in the chamber 21 surrounded by the dial 16 and the back cover structure 14 in the case 10.

  More specifically, a timepiece wheel train 22 is disposed at the center of the chamber 21, and a hand movement motor 23 that rotationally drives the train wheel 22 is disposed in the vicinity of the train wheel 22. An arc-shaped antenna unit 60 is disposed in the chamber 21 between the barrel 10 and the hand movement motor 23. The antenna unit 60 includes an antenna body 24 and a housing or antenna frame 61 for housing the antenna body 24. The antenna frame 61 includes an antenna frame main body 63 provided with a housing recess 62 of the antenna main body 24 and a lid body 64 that covers most of the antenna main body 24.

  The antenna body 24 is composed of a high frequency receiving antenna including an antenna core 25 and an antenna coil 26. The antenna core 25 has a core main body 27 and core end portions 28 and 29. The antenna core 25 is formed by laminating a plurality of thin plate pieces or foil pieces (hereinafter referred to as thin plate pieces) having the same size and shape made of a soft magnetic material such as a soft magnetic amorphous metal (alloy). The core main body 27 extends concentrically with the circular inner peripheral surface 10S having a circular cross section of the body 10 along the inner peripheral surface 10S. The core end portions 28 and 29 are bent in the thickness direction Z of the timepiece 1 with respect to the base end portions 33 and 34 connected to the respective end portions 31 and 32 of the main body portion 27 and the base end portions 33 and 34. The tip portions 35 and 36 and 37 and 38 extending in a state are provided. Here, instead of assuming that the tip portions 35, 36 and 37, 38 extend in the thickness direction Z of the timepiece 1, the tip portions 35, 36 and 37, 38 may be considered to be thicker than the core main body portion 27 in the thickness direction Z.

  End surfaces 41 and 42 of the tip portions 35 and 37 extend to the back cover side in the thickness direction Z to a position facing the inner surface 14S of the back cover structure 14. On the other hand, the front end portions 36 and 38 are loosely fitted into the openings 18 (not shown) and 18 of the dial 16, and the end surfaces 43 and 44 extend to the vicinity of the back surface of the dial ring 17.

  In the antenna unit 60, the antenna coil 26 is wound around the circumference of the central portion of the antenna core 25 of the antenna main body 24, and the antenna main body 24 is accommodated in the recess 62 of the main body 63 of the antenna frame 61. The outer peripheral surface 25S of the 24 antennas 25 is separated from the inner peripheral surface 10S of the trunk 10 by a length L1. This length L1 is about several mm (for example, about 1 to 2 mm).

  Further, in the antenna unit 60, the antenna core 25 is typically formed by stacking a large number of soft magnetic thin plate pieces having the same shape, so that the core end portions 28 and 29 of the antenna core 25 of the antenna body 24 are the base ends. The tip surfaces (envelope surfaces of the edges of the thin plate pieces) 51 and 52 of the portions 33 and 34 are inclined by an angle θ with respect to the radial direction. The angle θ is adjusted so that the distal end surfaces 51 and 52 are spaced from the inner peripheral surface 10S of the body portion 10 by a length L2 or more. This length L2 is typically, for example, about several mm and at least 2 mm. That is, in this radio-controlled timepiece 1, the end faces 51 and 52 of the antenna core 25 of the antenna body 24 are not oriented in the circumferential direction but are directed to the inner circumferential surface 10S of the case 10 to some extent, but the interval L2 therebetween is sufficiently large. Therefore, the interference of the reception of the standard radio wave by the case 10 can be minimized. In the radio-controlled timepiece 1, since there is a gap of size L1 between the outer peripheral surface 25S of the antenna core 25 and the inner peripheral surface 10S of the case 10, the interval of the size L2 is easy to realize.

  A circuit block 70 is also arranged in the chamber 21. The circuit block 70 includes a circuit board 71, a timepiece driving circuit component 72 and a radio wave correction circuit component 73 mounted on the circuit board 71. The timepiece driving circuit component 72 includes a timepiece integrated circuit portion of the crystal can 74, the microprocessor 75, and the composite integrated circuit 76. On the other hand, the radio wave correction circuit component 73 includes a radio wave correction circuit portion of the tuning element 77 and the composite integrated circuit 76 for tuning the antenna body 24 to the standard radio wave.

  A battery 80 is further provided in the chamber 21, and a minus terminal 81 and a plus terminal 82 in the form of a switch spring electrically connect the battery 80 and the circuit block 70 and the like.

  91 is a winding stem, and 92 and 93 are push button switches.

  In the radio-controlled timepiece 1 configured as described above, the distal end portions 36 and 38 of the core end portions 28 and 29 of the antenna core 25 of the antenna body 24 are loosely fitted into the openings 18 and 18 of the dial plate 16, and the core end portion. Since the end faces 43 and 44 of 28 and 29 extend to the vicinity of the back surface of the dial ring 17 and actually face the opening 11 of the case 10, they are electromagnetically exposed to the bottom of the opening 11. In the antenna body 24, the magnetic field component of the standard radio wave propagating on the dial plate 16 side can be detected with relatively high sensitivity by the antenna body 24 in a state where the influence of the case 10 is minimized.

  In the radio timepiece 1, the end surfaces 41 and 42 of the tip end portions 37 and 39 out of the core end portions 28 and 29 of the antenna core 25 of the antenna body 24 are close to the inner surface of the back cover glass 20 of the back cover structure 14. Is actually facing the opening 19S of the ring-shaped portion 19 of the back cover structure 14, and is electromagnetically equivalent to being exposed at the bottom of the opening 19S. The magnetic field component of the standard radio wave propagating on the lid structure 14 side can be detected with relatively high sensitivity by the antenna body 24 with the influence of the case 10 and the back cover ring-shaped portion 19 being minimized. In this radio-controlled timepiece 1, the central portion of the back cover structure 14 is made of non-magnetic and non-conductive glass 20 and is electromagnetically equivalent to being actually open. The radio waves can be surely picked up by the end faces 41 and 42 of the antenna core 25 to be operated.

  Further, the radio timepiece 1 includes a conventional antenna core that is not bent in the thickness direction Z because the core ends 28 and 29 of the antenna core 25 of the antenna body 24 are bent in the thickness direction Z of the timepiece 1. Compared with the conventional antenna main body, even if the circumferential end surfaces 51 and 52 of the core end portions 28 and 29 are relatively close to the metal watch case or the case 10, the metal case 10 allows the standard radio wave to be transmitted. The possibility that reception is hindered can be reduced.

  In addition, in the radio timepiece 1, the circumferential end surfaces 51 and 52 of the core end portions 28 and 29 are located apart from the metal barrel 10 by a length L2 or more, so that the standard radio wave can be received by the metal barrel 10. The risk of being disturbed can be further reduced.

  Note that the core end portion of the antenna body of the radio-controlled timepiece may protrude only in one direction instead of protruding in both the thickness directions.

  That is, for example, as shown in FIGS. 4 and 5A and 5B, the antenna core 25A lacks the projecting end portions 36 and 38 projecting in the Z direction toward the dial plate 16A, and the back cover. Only the projecting end portions 35 and 37 projecting in the Z direction toward the back glass 20 of the structure 14 may be provided. In this case, in order to minimize the leakage of the magnetic flux passing through the main body 27 of the antenna core 25A in the longitudinal direction at the base end portions (curved portions) of the projecting end portions 35 and 37 of the antenna core 25A, May be rounded as indicated by imaginary lines 46 and 47.

  In the electronic timepiece 1A shown in FIGS. 4 and 5 (a) and 5 (b), the subscript A is added to the end of parts, parts and elements different from the electronic timepiece 1 shown in FIGS. is there. In the electronic timepiece 1A, unlike the antenna core 25, the antenna core 25A lacks the projecting end portions 36 and 38. Therefore, the dial 16A is configured in the same manner as the electronic timepiece 1 except that the dial 16A lacks the opening 18. .

  In the electronic timepiece 1A, as in the case of the electronic timepiece 1, it is clear that the detection sensitivity of the standard radio wave is increased, and thus detailed description is omitted.

  As a result of the rough test, in the radio timepiece 1A provided with the antenna unit 60A, the portion facing the end surfaces 41, 42 of the tip portions 35, 37 is a metal outer ring-like ring-like shape of the back cover structure 14. Compared to the case of the comparative example facing the portion 19 (when the diameter of the back glass 20 is small and it is considered that the advantage of having the tip portions 35 and 37 is lacking), the reception sensitivity of the standard radio wave is about 3 dB. It was confirmed to improve. From this test result, the radio timepiece 1 having the antenna unit 60 shown in FIGS. 1 to 3 is expected to improve the reception sensitivity at least at this level or higher.

  Further, for example, as shown in FIGS. 6 and 7A and 7B, the antenna core 25B protrudes toward the back glass 20 of the back cover structure 14 in the Z direction, 37 may be provided, and only projecting end portions 36 and 38 projecting in the Z direction toward the dial 16 may be provided. In this case as well, the corners of the antenna core 25B are prevented from leaking at the base end portions (curved portions) of the projecting end portions 36 and 37 of the antenna core 25B. The part may be rounded as indicated by imaginary lines 48 and 49.

  In the electronic timepiece 1B shown in FIGS. 6 and 7 (a) and 7 (b), the subscript B is added to the end of parts, parts and elements different from the electronic timepiece 1 shown in FIGS. is there. In the electronic timepiece 1B, the antenna core 25B is configured in the same manner as the electronic timepiece 1 except that the antenna core 25B lacks the protruding end portions 35 and 37, unlike the antenna core 25.

  In this electronic timepiece 1B, as in the case of the electronic timepiece 1, it is clear that the detection sensitivity of the standard radio wave is increased, and thus detailed description is omitted.

  For example, the antenna core lacks projecting end portions 36 and 38 projecting in the Z direction toward the dial plate 16A as shown in FIGS. 4 and 5A and 5B, and the back cover structure 14. Antenna core 25A provided only with projecting end portions 35 and 37 projecting in the Z direction toward the back cover glass 20, or a back cover structure as shown in FIGS. 6 and 7 (a) and (b). When the antenna core 25B is provided with only the projecting end portions 36 and 38 projecting in the Z direction toward the dial 16 without the projecting end portions 35 and 37 projecting in the Z direction toward the 14 back glass 20. A large number of soft magnetic thin plates constituting the antenna cores 25A and 25B may be L-shaped with Z-direction protrusions only at one end instead of being U-shaped with Z-direction protrusions at both ends. Good.

  That is, as shown in FIG. 8 (a), two element bodies 54, 54 each including a plurality of L-shaped soft magnetic thin plates 53 are prepared, and L leg portions 55 corresponding to the Z-direction protrusions are prepared. The antenna core 25C may be formed by stacking the two element bodies 54 and 54 so that the first and second elements 55 and 55 are positioned at opposite ends.

  As shown in FIG. 8B, the antenna body 24C provided with the antenna core 25C has leg portions 55 and 55 located outside and inside in the thickness direction (radial direction). It can function in the same manner as the direction protrusions 35 and 37 and the Z direction protrusions 36 and 38 of the antenna core 25B, and the radio timepiece including the antenna core 25C can detect standard radio waves with high sensitivity.

  The soft magnetic thin plate 53 may be T-shaped instead of L-shaped. In that case, protruding ends that extend toward both the watch glass and the back cover may be formed at both ends of the antenna core in the same manner as shown in FIGS.

  Since the dial is located behind the watch glass on the watch glass side, the antenna unit is located on the inside of the end connected to the watch glass when viewed in the thickness direction of the watch case. Since the case back is located at the end of the watch case, the antenna unit can be located near the end of the case as viewed in the thickness direction of the watch case. Therefore, when viewed in the thickness direction of the timepiece, the degree of reception interference by the metal timepiece case is lower on the case back side. In this aspect, when the entire back cover or the main body part is made of a non-magnetic non-conductive material such as glass, the antenna is located within the range of the part and close to the back cover when viewed in the thickness direction of the watch. By arranging the main body, even if the core end of the antenna main body does not have a tip portion extending in the thickness direction (in other words, a thick tip portion in the thickness direction), the reception sensitivity of the antenna can be improved. It becomes possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory plan view of a radio timepiece according to a preferred embodiment of the present invention as viewed from the back cover side (however, the part inside the watch case (body) from the inner peripheral surface with the back cover etc. omitted); Sectional explanatory drawing of the radio timepiece of FIG. FIGS. 2A and 2B show an antenna portion of the radio timepiece of FIG. 1, in which FIG. 1A is an explanatory side view of the antenna body, and FIG. Sectional explanatory drawing similar to FIG. 2 about the radio timepiece of the modification of this invention. FIG. 5 is an explanatory view similar to FIG. 3 of the radio timepiece of FIG. 4, (a) is a side view of the antenna body, and (b) is a plane view of the antenna unit and the circuit block. Sectional explanatory drawing similar to FIG. 2 about the radio timepiece of another modification of this invention. FIG. 7 is an explanatory view similar to FIG. 3 of the radio timepiece of FIG. 6, wherein (a) is a side view of the antenna body, and (b) is a plan view of the antenna unit and circuit block. FIG. 4 shows an antenna body of a radio timepiece according to still another modified example of the present invention, in which (a) is an explanatory perspective view for explaining assembly of the antenna core, and (b) is an antenna having the antenna core of (a). FIG.

Explanation of symbols

1,1A, 1B radio wave clock (radio wave correction clock)
10 Watch case (body)
10S Inner peripheral surface 12 Clock glass 14 Back cover structure 14S Back cover inner surface 16, 16A Dial 17 Dial ring 19 Outer ring side portion 20 Back glass (back cover body)
22 Clock train wheel 23 Motor 24, 24A, 24B, 24C Antenna body 25, 25A, 25B, 25C Antenna core 25S Outer surface 26 Antenna coil 27 Core body 28, 29 Core end 31, 32 End of core body Portions 33, 34 Core end portions 35, 36, 37, 38 Core end portions 41, 42 End portions 51, 52 End surfaces 51, 52 Base end portions (envelopes of the edges of the thin plate pieces)
60 antenna unit 61 antenna frame 62 recess 70 circuit block 71 circuit board 72 clock drive circuit component 73 radio wave correction circuit component 76 composite integrated circuit 80 battery 81, 82 terminal 91 winding stem 92, 93 push button switch L1, L2 distance θ angle

Claims (10)

  A radio-controlled timepiece having a high-frequency receiving antenna including an antenna core and an antenna coil in a watch case, wherein the antenna core extends along the extending surface of the watch body, and at least the core body portion A radio-controlled timepiece having a core end portion connected to one end portion and having a tip end portion extending in a thickness direction of the timepiece in a direction intersecting with an extending direction of the core main body portion.   2. The antenna core according to claim 1, wherein the antenna core has a tip portion connected to both ends of the core main body portion and extending in a thickness direction of the watch in a direction intersecting with an extending direction of the core main body portion. Radio clock.   The tip end portion of the core end portion has a tip portion extending to the vicinity of the back cover toward the back cover made of a nonmagnetic non-conductive material, and the end surface of the tip portion faces the back cover. The radio timepiece according to claim 1 or 2.   The radio timepiece according to claim 3, wherein the back cover is made of glass.   The tip portion of the core end portion has a tip portion extending to the vicinity of the dial ring toward a watch glass made of a nonmagnetic non-conductive material, and an end face of the tip portion faces the dial ring. The radio timepiece according to any one of items 1 to 4.   The radio timepiece according to claim 5, wherein a dial located on the back side of the dial ring has an opening, and the tip of the tip of the core end is loosely fitted in the opening of the dial. .   The radio timepiece according to any one of claims 1 to 6, wherein the antenna core is curved in an arc shape along the curvature of the inner surface of the case.   The radio timepiece according to any one of claims 1 to 7, wherein the antenna core is formed of a laminate of a plurality of soft magnetic thin plates laminated in a radial direction.   The end face of the antenna core that intersects the circumferential direction is spaced from the inner peripheral face of the case with an angle θ (provided that θ> 0) inclined with respect to the radial direction of the watch. The radio timepiece according to any one of claims 1 to 8, which faces the inner peripheral surface.   The radio timepiece according to claim 9, wherein the interval is 2 mm or more.

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