JP2008107125A - Antenna structure for radio wave correcting clock, and radio-wave correcting clock equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna structure for a radio-controlled clock having a simple structure, capable of suppressing the number of components, or the like to a minimum. <P>SOLUTION: This antenna structure 1 for the radio-controlled clock is formed by embedding a cylindrical coil 10 in a base material 23, where magnetic body powder 21 is dispersed into resin 22. A base material structure part 20 formed of the base material has a main magnetic path forming base material structure part 30 filled inside a coil cylinder 11, in order to form a main magnetic path P1 that is magnetized by a magnetic field B of standard radio waves; and a sub-magnetic path forming base material structure part 40, integrated with the main magnetic path forming base material structure part at both ends of the coil, for covering the outer circumference of the coil, in order to form a sub-magnetic path P2 for resonance, having magnetic resistance larger than that of the main magnetic path P1. Typically, the sub-magnetic path forming base material structure part 40 is equipped with a one-end side outer circumferential sub-magnetic path forming base material structure part 41 of the coil, an other-end side outer circumferential sub-magnetic path forming base material structure part 42 of the coil, and high magnetoresistive parts 43, 44 formed on the outer circumference of the coil between the one-end side and the other-end side outer circumferential sub-magnetic path forming base material structure parts. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an antenna structure for a radio wave correction timepiece (radio timepiece) and a radio wave correction timepiece (radio timepiece) including the same.

  A radio-controlled timepiece that detects a standard radio wave including time information and corrects a display time is known. Since the standard radio wave is an electromagnetic wave in a long wave region (40 kHz or 60 kHz), in a radio-controlled timepiece, the magnetic field component of the standard radio wave is usually detected by a coil type antenna. In addition, in order to detect this time information with high sensitivity by an antenna housed in a metal watch case, on the other hand, a main magnetic path that shows a high response to the magnetic field of a standard radio wave passes through the inside of the cylindrical coil. On the other hand, it is also possible to form a secondary magnetic path for resonance outside the cylindrical coil that serves to suppress the magnetic field generated by the coil current during resonance from entering the metal case. It has been proposed (Patent Documents 1 to 4).

  However, the radio wave correction watch antenna structure conventionally proposed in these patent documents requires a complicated structure or configuration in order to form the secondary magnetic path, and it is difficult to avoid an increase in the number of parts. Therefore, in order to realize this structure in a narrow space inside the watch case, it is difficult to avoid an increase in parts cost and assembly cost.

In addition, in the bonded magnet formed by solidifying magnetic powder with a binder resin, a cylindrical coil is embedded and manufacturing a closed magnetic circuit type coil element used as a choke coil or an inductor itself is It has been proposed (Patent Document 5). Although this patent document 5 also mentions that this closed magnetic circuit type coil element can be used as an antenna coil, there is no further disclosure.
JP 2005-102023 A JP 2005-101708 A JP 2006-81140 A JP 2006-105864 A JP 2006-80127 A

  The present invention has been made in view of the above points, and has an antenna structure for a radio-controlled watch (radio clock) that has a simple structure and can minimize the number of parts, and a radio-controlled watch (radio clock) having the same. Is to provide.

  In order to achieve the above object, the radio wave correction watch antenna structure of the present invention is a radio wave correction watch antenna structure in which a cylindrical coil is embedded in a base material in which magnetic powder is dispersed in a resin. The base material structure formed by the base material is filled in the cylinder of the cylindrical coil so as to form a main magnetic path magnetized by a magnetic field of a standard radio wave. And the cylindrical coil to form a resonance secondary magnetic path that is integrated with the main magnetic path forming preform structure and has a larger magnetic resistance than the main magnetic path at both ends of the cylindrical coil. And a secondary magnetic path forming base material structure portion covering the outer periphery of the substrate.

  In the antenna structure for a radio wave correction watch according to the present invention, since the cylindrical coil is embedded in the base material in which the magnetic powder is dispersed in the resin, it can be integrally insert-molded. The structure can be greatly simplified compared to the case of combining a large number of parts, which is equivalent to a single part.

  Further, in the radio wave correction watch antenna structure of the present invention, “a base material structure portion formed by the base material forms a main magnetic path magnetized by a magnetic field of a standard radio wave”. And a sub magnetic path forming base material structure that is connected to the main magnetic path forming base material structure at both ends of the tube of the cylindrical coil and forms a resonance sub magnetic path having a larger magnetic resistance than the main magnetic path. Therefore, even if there is a metal part such as a metal watch case in the vicinity, resonance can be caused and a signal can be taken out in a state where the decrease in sensitivity due to the part or the like is minimized. Here, in the radio wave correction watch antenna structure of the present invention, since the sub magnetic path forming base material structure covers the outer periphery of the cylindrical coil, the sub magnetic path forming base material structure is formed by the cylindrical coil itself. Since it can be supported, it is formed relatively thin (preferably about 1 mm or less, but may be thicker), and can be formed extremely compact as a whole. The sub magnetic path forming base material structure portion typically has the same thickness in each portion in the longitudinal direction of the cylindrical coil. However, if desired, the thickness may vary depending on the portion. Further, in the radio wave correction watch antenna structure of the present invention, the main magnetic path is formed in the main magnetic path forming base material structure filled inside the cylinder of the cylindrical coil and the openings at both ends of the cylinder of the cylindrical coil. The main magnetic path and the sub magnetic path can be formed as a single base material structure from a single base material. . The main magnetic path forming base material structure and the sub magnetic path forming base material structure are typically made of the same material. However, if desired, both base material structures are made of different materials. For example, the distribution of the size and shape of the magnetic powder forming the two base material structure parts is different, the composition of the magnetic powder forming the two base material structure parts is different, the two base material structures The ratio and composition of the resin used for the part and acting as a binder may be different.

  In the antenna structure for a radio wave correction watch of the present invention, typically, the sub magnetic path forming base material structure portion covers one end side outer peripheral sub magnetic path forming base covering the region including one end portion of the cylindrical coil. The other end side outer peripheral sub magnetic path forming base material structure part covering the region including the other end part of the cylindrical coil, the one end side outer peripheral sub magnetic path forming base material structure part, and the other end side And a high magnetic resistance portion formed along the outer periphery of the cylindrical coil between the outer peripheral sub magnetic path forming base material structure portions.

  In this case, the magnetic resistance of the secondary magnetic path between one end and the other end of the cylindrical coil can be reliably configured to be larger than the magnetic resistance of the main magnetic path between both ends. Therefore, even if there is a metal part such as a metal watch case around it, resonance can be caused and a signal can be taken out with a decrease in sensitivity due to the part being minimized. Here, in the radio wave correction watch antenna structure of the present invention, the “one end side outer peripheral sub magnetic path forming base material structure portion” and the “other end side outer peripheral sub magnetic path forming base material structure portion” are respectively “cylindrical. Since it is formed in a state of “covering the region including one end of the coil” or “covering the region including the other end of the cylindrical coil”, the “one end side outer peripheral sub magnetic path forming base material structure part” ”And“ the other end side outer peripheral sub magnetic path forming base material structure ”can be supported by the cylindrical coil itself, so that it is formed relatively thin (preferably about 1 mm or less, but may be thicker) It can be formed extremely compact as a whole. The “one end side outer peripheral sub magnetic path forming base material structure” and the “other end side outer peripheral sub magnetic path forming base material structure” typically have the same thickness at each part in the longitudinal direction of the cylindrical coil. However, if desired, the thickness may vary from site to site.

  Here, as long as the high magnetic resistance portion is “formed along the outer periphery of the cylindrical coil between the one end side outer periphery sub magnetic path forming base material structure portion and the other end side outer periphery sub magnetic path forming base material structure portion”. Anything can be used. That is, the high magnetoresistive portion may be a void, a non-magnetic material (for example, a resin serving as a base material binder or a softening point resin different from the resin, etc.), or both may be mixed, Furthermore, as long as the cross-sectional area through which the magnetic flux passes is sufficiently small so that the outer peripheral side secondary magnetic path forming base material structure as a whole can have a sufficiently higher magnetic resistance than the main magnetic path, It may be different) and may be made of materials.

  Note that, in the radio wave correction watch antenna structure of the present invention, typically, the high magnetic resistance portion includes a gap extending in a ring shape along the outer periphery of the cylindrical coil. In that case, the gap of the sub magnetic path forming base material structure is “cylindrical” between the “one end side outer peripheral sub magnetic path forming base material structure” and the “other end side outer peripheral sub magnetic path forming base material structure”. Since it extends in a ring shape along the outer periphery of the coil, a gap having a desired size (length or width) can be reliably formed, and the sub magnetic path can effectively resonate. Here, in the “air gap”, the outer peripheral surface of the cylindrical coil is typically exposed without the base material, but the “one end side outer peripheral sub magnetic path forming base material structure” or “the other end side outer peripheral sub magnetic field”. As long as the magnetic resistance is sufficiently high compared to the “path forming base material structure”, the outer peripheral surface of the cylindrical coil may be covered with a thin coating layer of the base material.

  Here, the “ring” typically has a U-shape that is open at one end. This makes it possible to support the cylindrical coil inserted into the mold with the lower mold during the insert molding, and the U-shaped support portion of the lower mold has a U-shaped gap (that is, a gap). Or a groove). In that case, the ring-shaped region serving as a gap is typically in a plane perpendicular to the longitudinal direction of the cylindrical coil in the portion. Here, the portion facing the U-shaped gap typically has the same composition as the base material constituting the base material structure, but if desired, does not actually contain magnetic powder or at a low concentration. You may consist of resin in which the magnetic substance part was disperse | distributed.

  In addition, when a ring forms a closed curve in the outer periphery of a cylindrical coil, it may not be in the surface perpendicular | vertical with respect to the longitudinal direction of a cylindrical coil, but may incline or meander.

  For example, the inner peripheral surface of a semicircular support portion as a whole in the lower mold has a zigzag meandering shape, and the same semicircular support in the region facing the support portion in the upper die By forming a portion (having a zigzag meandering inner peripheral surface), a continuous gap may be formed over the entire circumference of the cylindrical coil. However, when the main magnetic path forming base material structure in the cylindrical coil can provide sufficient mechanical strength for handling such as lifting and carrying of the antenna structure, the ring-shaped gap is the length of the cylindrical coil. It may be an endless ring extending in a plane perpendicular to the direction.

  The high magnetic resistance portion serving as a gap is typically formed in the middle (center) portion in the longitudinal direction of the cylindrical coil. However, as long as it is not an end part, if desired, it may be shifted to either side in the longitudinal direction of the cylindrical coil.

  The cylindrical coil typically has an arc shape along the inner peripheral surface of the case so as to be suitable for accommodation in the watch case. However, if desired, it may be a polygonal line along the arc or a straight line. The cylindrical coil typically has a circular cross-sectional shape, but may be other shapes such as a rectangle or an oval if desired. The diameter of the cross section of the cylindrical coil is typically about 1 to 2 mm. However, it may be larger or smaller. The length of the cylindrical coil is typically about 1 to 2 cm. However, it may be larger or smaller.

  The cross section of the outer peripheral side secondary magnetic path forming base material structure is typically rectangular in order to improve mounting stability, but instead, other shapes such as oval, elliptical and circular shapes are used. It may be.

  The magnetic powder is made of a soft magnetic material powder. The soft magnetic material may be a metal (including an alloy) or a compound such as ferrite, and may be amorphous or crystalline. Even if the powder is nearly spherical, the aspect ratio is large and elongated, and the shape anisotropy is high, or even flakes, two or more of these are mixed You may do it. Further, the shape and size distribution of the granular material may be different between the main magnetic path forming base material structure and the sub magnetic path forming base material structure. The (average) particle size of the magnetic powder is, for example, about several tens of μm. However, it may be smaller (may be about 10 μm or less), and may be larger (for example, about 0.1 mm or more) in some cases.

  In the radio wave correction watch antenna structure of the present invention, typically, the resonance magnetic sub-clock having a larger magnetic resistance than the main magnetic path extends in an arc shape from at least one end of the main magnetic path forming base material structure. A second sub magnetic path forming base material structure forming a magnetic path is provided. In this case, the second sub magnetic path forming base material structure portion can not only function as a sub magnetic path but is also used for supporting other parts of the radio wave correction timepiece. The “arc” is typically an arc (part of a circle) in practice, but may have a different shape from the arc if desired.

  In that case, in the radio wave correction watch antenna structure of the present invention, typically, the second sub magnetic path forming base material structure portion is connected to one end and the other end of the main magnetic path forming base material structure portion. One and the other arc-shaped sub magnetic path forming base material structure part extending in an arc shape, and the one and the other arc-shaped sub magnetic path forming base material structure part via the second gap at each extending end Opposite. However, if desired, one of the one and the other second arcuate sub-magnetic path forming base material structure part may have a long arc shape and the other may be short.

  The radio wave correction watch antenna structure of the present invention is typically configured such that a winding stem is inserted along the second gap. In that case, since the winding hole or the like can form the second gap as it is, there is little structural waste and the configuration can be simplified.

  In the antenna structure for a radio wave correction watch of the present invention, typically, the second sub magnetic path forming base material structure part includes a base part on which a standard radio wave receiving circuit is placed. In this case, since the connection and support between the receiving circuit and the antenna structure are facilitated, the assembly can be performed very easily. Here, the receiving circuit includes a resonance capacitor. Typically, a capacitor group (typically, a plurality of capacitors having different capacitances) is provided, and one or more of these capacitors are selectively connected and used. The receiving circuit may include a receiving IC (integrated circuit), and may further include a crystal can for the receiving circuit if desired.

  In the radio wave correction watch antenna structure of the present invention, typically, the main magnetic path forming base material structure and the second sub magnetic path forming base material structure form a movement frame that surrounds the movement as a whole. ing. In this case, it is not necessary to provide a separate attachment mechanism for fixing the radio wave correction watch antenna structure to the movement frame, so that the radio wave correction watch can be assembled very easily.

  In this case, the radio wave correction watch antenna structure of the present invention is typically configured such that the movement frame is disposed along the inner periphery of the watch case.

  In the above, in the radio wave correction watch antenna structure of the present invention, typically, injection in the form of insert molding in which a cylindrical coil is inserted (inserted) into an injection mold and resin is injected and injected. It is formed by molding. In that case, the cylindrical coil is disposed at a predetermined position in the molding die. In this injection molding, typically, the main magnetic path forming base material structure portion and the sub magnetic path forming base material structure portion (if there is a second sub magnetic path forming base material structure portion, the second sub magnetic path forming base material structure portion). The magnetic path forming base material structure is also integrally formed at the same time. In this case, for example, in consideration of the heat resistance temperature of the insulation film of the coil wire (for example, a polyimide film having a heat resistance temperature of 220 ° C.), a magnetic material powder dispersed in ABS resin is molded at a molding temperature of about 190 ° C. To do. However, any other resin may be used as long as it can be molded, and the insulating film of the coil wire may be another material. If desired, instead of forming the whole at the same time, the whole or a part of the main magnetic path forming base material structure (for example, the central region excluding the vicinity of both ends in the cylinder) is formed first, You may form a magnetic path formation preform | base_material structure part. In the antenna structure for a radio wave correction watch, the coil typically has a relatively small diameter of about 1 to 2 mm and a length of about 1 to 2 cm, and the concentration of the magnetic powder in the injection molding material is relatively long. Since it is high, in consideration of the fluidity of the molding material, the injection gate of the injection molding material may be directed to the position and direction facing the opening of the coil. However, as long as molding can be performed, the gate position, direction, number, and selection may be selected.

  The radio-controlled timepiece according to the present invention includes the antenna structure as described above.

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

  As shown in FIGS. 1A to 1D, a radio-controlled timepiece antenna structure 1 according to a preferred embodiment of the present invention includes a cylindrical coil 10 and a base material structure in which the coil 10 is embedded. A movement frame body 20 as a body is provided.

  As can be seen from FIG. 1A, the air-core coil or cylindrical coil 10 has an arc shape as a whole, and its cross-sectional shape is circular as can be seen from FIGS. 1C and 1D. is there. The length of the cylindrical coil 10 is, for example, about 1 to 2 cm, and the diameter is about 1 to 2 mm. However, one or both of the length and diameter may be larger or smaller. Both ends of the winding 16 of the coil 10 or coil terminals 16A and 16B protrude from the tube 11 of the coil 10 at one end 14A of the coil 10.

  The planar shape of the cylindrical coil 10 may be a linear shape instead of an arc shape, or may be another shape such as a polygonal line shape (a shape forming a part of a polygon) along a circle or the like as a whole. . Moreover, the cross-sectional shape of the cylindrical coil 10 may be other shapes such as a rectangular shape or an oval shape instead of a circular shape.

  A movement frame main body or module frame main body 20 as a base material structure is formed of a material (base material) 23 in which a magnetic powder 21 is dispersed in a resin 22 acting as a binder, and can be seen from FIG. Thus, it has a C-shaped planar shape as a whole. The movement frame body 20 is substantially complementary to an outer peripheral surface 20E along a cylindrical (circular in plan view) envelope surface and an outer peripheral surface 81 of a movement in the form of a module described later, that is, a movement module 80 (see FIG. 3). And an inner peripheral surface 20F having an arbitrary shape. The cross section of the movement frame main body 20 is rectangular as can be seen from FIG. However, as long as the placement stability of the movement frame 20 can be ensured, the cross-sectional shape thereof may be other shapes such as an oval shape. As will be described later, the shape of the outer peripheral surface 20E may be different from that shown in the drawing as long as it is suitable for placement in the watch case 7 (FIG. 4).

  The magnetic powder is made of a soft magnetic material powder. The soft magnetic material may be a metal (including an alloy) or a compound such as ferrite, and may be amorphous or crystalline. Even if the granular material is nearly spherical, the aspect ratio is large and elongated, and the shape anisotropy is high, or the flake shape is mixed, two or more of these are mixed. May be. The (average) particle size of the magnetic powder is, for example, about several tens of μm. However, it may be smaller (may be about 10 μm or less), and may be larger in some cases.

  The base material structure 20 covers the main magnetic path forming base material structure portion 30 that fills the inside 12 of the tube 11 of the cylindrical coil 10 and functions as a magnetic core, and the most part of the outer periphery 13 of the cylindrical coil 10. A first sub magnetic path forming base material structure 40; and connecting base material structures 24 and 25 integrally connected to one and other ends 31 and 32 of the main magnetic path forming base material structure 30; It consists of one and the other arcuate sub magnetic path forming base material structure portions 61 and 62 extending in an arc shape from the connection base material structure portions 24 and 25.

  More specifically, the main magnetic path forming base material structure 30 fills the region of the inside 12 of the cylindrical coil 10 and is connected outside the openings 15A and 15B of the ends 14A and 14B of the cylinder 11 of the cylindrical coil 10. It is integrally connected to the base material structures 24 and 25. Therefore, the main magnetic path P1 that defines the current flowing through the winding 16 of the cylindrical coil 10 in accordance with the magnetic field fluctuation of the standard radio wave is typically the main magnetic path forming base material structure 30 and the connection between both ends thereof. It is formed by the base material structures 24A and 24B.

  The connection base material structures 24 and 25 include a main magnetic path forming base material structure 30, a first sub magnetic path forming base material structure (base material structure on the outer periphery of the coil 10) 40, and a second sub magnetic path. This is a portion that integrally connects the forming base material structure (arc-shaped base material structure away from the coil 10) 60, a region that functions as the main magnetic path P1, and the first and second sub magnetic paths 2 , P3 change depending on the direction of the clock or the direction of the external field, so the boundary is not uniquely determined.

  The first sub magnetic path forming base material structure 40 forms a sub magnetic path along the outer periphery 13 on the outer periphery 13 side of the cylindrical coil 10. One end side coil outer peripheral sub magnetic path forming base material structure portion 41 and the other end side coil outer peripheral sub magnetic path forming base material structure portion 42 defined by a U-shaped notch or groove or opening 43 are provided. The one end side coil outer peripheral sub magnetic path forming base material structure portion 41 covers the outer peripheral portion 13A of the cylindrical coil 10 between one end portion 14A of the cylindrical coil 10 and a position MA near the longitudinal center portion M. The other end side coil outer peripheral sub magnetic path forming base material structure portion 42 is formed by disposing the outer peripheral portion 13B of the cylindrical coil 10 between the other end portion 14B of the cylindrical coil 10 and the position MB in the vicinity of the longitudinal center portion M. Cover. The one end side coil outer periphery sub magnetic path forming base material structure portion 41 and the other end side coil outer periphery sub magnetic path forming base material structure portion 42 are connected resin in the region below the coil 10 in FIG. They are integrally connected via the portion 44.

  The thicknesses of the coil outer peripheral sub magnetic path forming base material structures 41 and 42 covering the outer peripheral portions 13A and 13B of the coil 10 are typically about 1 mm or less. However, it may be thicker if desired. Instead of covering the entire outer peripheral portions 13A and 13B of the coil 10, the coil outer peripheral sub magnetic path forming base material structure portions 41 and 42 may cover only a part thereof.

  In the ring-shaped groove or opening 43, the outer periphery 13 of the central portion (intermediate portion) 17 in the longitudinal direction of the coil 10 is actually exposed. However, if desired, a thin layer of the base material 23 may be formed on the outer periphery 13 of the coil 10 as long as it can provide a substantially high magnetic resistance.

  As long as the mechanical strength of the antenna structure 1 can be ensured, the connection resin portion 44 preferably has a cross-sectional area as small as possible so as to provide a high magnetic resistance. If desired, the concentration of the magnetic powder 21 in the connection resin portion 44 may be made lower than that of other portions, or the connection resin portion 44 may be formed of only a resin that does not mix the magnetic powder 21.

  The one end side coil outer peripheral sub magnetic path forming base material structure portion 41 is integrally connected to the connection base material structure portion 24 on the end portion 14A side, and the other end side coil outer peripheral sub magnetic path forming base material structure portion 42 is on the end portion 14B side. Are integrally connected to the connecting base material structure 25. Therefore, the first sub magnetic path P2 serving as the resonance sub magnetic path is actually the connection base material structure 24, the one end side coil outer periphery sub magnetic path forming base material structure part 41, the U-shaped groove 43 and the connection. The resin portion 44, the other end side coil outer peripheral sub magnetic path forming base material structure portion 42, and the connection base material structure portion 25 are formed.

  One arcuate sub-magnetic path forming base material structure 61 includes a receiving circuit block mounting recess 64 on a back cover side surface (front surface in FIG. 1A) 63. The concave portion 64 includes a resonance adjusting capacitor group mounting concave portion 64A, a receiving circuit crystal can mounting concave portion 64B, and a receiving IC (integrated circuit) mounting concave portion 64C. Here, the portion of the arcuate sub-magnetic path forming base material structure portion 61 having the receiving circuit block mounting recess 64 is a base on which the receiving circuit block 70 (FIG. 2) is placed.

  One arcuate sub magnetic path forming base material structure 61 further includes a movement module locking notch 65A reaching the surface 63 at the inner peripheral surface 20F. The other arcuate sub magnetic path forming base material structure portion 62 is provided with a notch for locking the movement module reaching the back surface (the back surface in FIG. 1A, not shown) at the inner peripheral surface 20F. A portion 65B is provided.

  The extending end 61A of one arcuate sub-magnetic path forming base material structure portion 61 and the extending end 62A of the other arc-shaped sub-magnetic path forming base material structure portion 62 form a winding stem insertion gap 66 as a gap. Are opposed to each other in the circumferential direction. The gap 66 has a size and shape suitable for mounting or inserting the winding stem 82 of the movement module 80.

  In the above, the second sub magnetic path P3 includes the connecting base material structure 24, one arcuate sub magnetic path forming base material structure part 61, the gap 66 and the connecting resin part 44, and the other arc sub magnetic path forming base. It is formed by the material structure portion 62 and the connection base material structure portion 25.

  In the antenna structure 1 configured as described above, since the antenna structure 1 is configured integrally with the module frame main body 20, not only a mounting structure for mounting the antenna to another support member is required. The antenna structure 1 can be supported firmly and stably. Also, the number of parts can be minimized.

  Therefore, in the antenna structure 1, the magnetic flux passing through the main magnetic path P <b> 1 typically varies according to the external magnetic field B caused by the standard radio wave, and a current flows through the winding 16 of the coil 10 according to this. . When resonance occurs between the coil 10 having the main magnetic path P1 formed of a magnetic core made of a soft magnetic material and a capacitor that is selectively connected among a group of capacitors described later, the magnetic flux accompanying the resonance is changed to the main magnetic path P1. And pass through the auxiliary magnetic paths P2 and P3. Thereby, a large resonance is maintained, and time information in the standard radio wave is extracted with high detection sensitivity and processed by the receiving circuit. The sub magnetic paths P2 and P3 are provided with the air gaps 43 and 66, respectively, so that the magnetic resistance is sufficiently higher than that of the main magnetic path P1, so that most of the magnetized magnetic flux due to the external magnetic field B caused by the standard radio wave. Since this portion passes through the main magnetic path P <b> 1, the magnetic flux fluctuation can be reliably detected by the coil 10.

  Since the movement frame main body 20 as a base material structure portion of the antenna structure 1 has a C-shaped planar shape as a whole, the movement frame main body 20 of the antenna structure 1 is inclined with respect to the movement frame main body 20 (for example, (a ) Even when the magnetic field of the standard radio wave acts in the direction indicated by B1 or B2), at least a part of the arcuate sub-magnetic path forming base material structure part 61 or 62 and the connection base material structure parts 24, 25 And the main magnetic path forming base material structure 30 can respond to form the main magnetic path P1. Therefore, the base material structure forming the main magnetic path P1 is not limited to the above-described typical example. It should be noted that most of the arc-shaped portions may be regarded as the connection base material structures 24 and 25. In this case, the main magnetic path P1 is formed by the structure 30 and a part of the structures 24 and 25. The The sub magnetic paths P2 and P3 are as described above. Further, when it is necessary to take a large gap 66, the sub magnetic path P3 may not actually function.

  The antenna structure 1 as described above is typically formed by insert molding using an injection mold. That is, the cylindrical coil 10 is supported by inserting the central portion 17 of the cylindrical coil 10 into the U-shaped support portion of a molding die having a U-shaped support portion complementary to the gap groove portion 43. The antenna structure 1 including the cylindrical coil 10 in an embedded state is formed by injecting and injecting a molding material 23 composed of the magnetic powder 21 and the resin 22 into the mold. Here, as the resin 22 acting as a binder, for example, a material having a molding temperature lower than that of the insulating coating material (for example, a polyimide resin having a heat resistant temperature of about 220 ° C.) so that the insulating coating of the winding 16 of the coil 10 is not damaged. (For example, an ABS resin having a molding temperature of about 190) is used. In addition, the position, orientation, and number of gates in order to reliably inject and fill the molding material 23 into the inside 12 of the cylinder 11 of the coil 10 so that the cylinder 11 of the air-core coil 10 is maintained in its original shape without being crushed. Select. For example, a gate may be provided in the injection mold so that the molding material 23 is injected from one or both of the openings 15A and 15B of the cylinder 11 of the coil 10 toward the inside 12 of the cylinder 11. In addition, the connection resin portion 44 positioned opposite to the gap 43 is formed in advance with a molding resin material in which the concentration of the magnetic powder 21 is low or does not include the magnetic powder 21, and then the molding material 23 is injected. The antenna structure 1 may be formed by filling.

  As shown in FIG. 2, a receiving circuit block 70 is attached to the antenna structure 1 including the movement frame main body 20. The reception circuit block 70 includes a circuit board 71. The circuit board 71 includes a reception circuit circuit board portion 72 placed in the reception circuit placement recess 64 and a connection board portion 73 connected to a circuit for the movement 80 (FIG. 3). Mounted on the circuit board portion 72 for receiving circuit are a resonance adjustment capacitor group 74 placed in the recess 64A, a crystal can 75 for receiving circuit placed in the recess 64B, and a receiving IC 76 placed in the recess 64C. Then, the terminals 16A and 16B of the coil 10 of the antenna structure 1 are connected to the antenna connection terminals 77A and 77B of the circuit board portion 72 for receiving circuit.

  Therefore, the radio wave correction receiving apparatus 2 is integrally formed by the antenna structure 1 including the movement frame body 20 and the receiving circuit 70 placed and connected to the receiving circuit placing recess 64. This radio wave correction receiving apparatus 2 constitutes a movement frame 3 as a whole. In terms of shape, it may be considered that the movement frame 3 is formed by the antenna structure 1 itself.

In this radio wave correction receiving device 2, the antenna structure 1 directly supports the receiving circuit 70 that is placed and fixed in the recess 64, so that an unexpected force may be applied to the connection between the coil 10 and the circuit 70 of the antenna structure 1. There is little risk of disconnection.

  A movement 80 having an outer peripheral surface 81 having a shape complementary to the peripheral surface 20F is disposed in a recess or opening 26 surrounded by the inner peripheral surface 20F of the movement frame 3. The movement 80 includes a watch wheel train 83, a train wheel drive motor 84, a motor drive circuit 87 including a crystal can 85 and a watch IC (integrated circuit) 86, and a battery 88.

  In some product fields of the AQ (Analog Quartz) Movement 80, there are virtually standard outer shapes. Therefore, for example, if a movement frame 3 having an inner peripheral surface 20F adapted to its outer shape is prepared, different radio waves as shown in FIG. 4 can be obtained simply by replacing the AQ movement module 80 having various performances. A corrected clock 5 is formed.

  In the module 80, the switch 89B can be operated by pushing the winding stem 82 against the spring portion 89A in the N1 direction, and the radio wave correction operation by the receiving device 2 can be started.

  During assembly, the movement 80 is fitted into the recess 26 so that the outer peripheral portion of the movement 80 is engaged with the locking notches 65A and 65B of the movement frame body 20, and the movement frame 3 is shown in FIG. As shown in FIG. 4, the radio wave correction timepiece 5 may be assembled by inserting the winding stem 82 after being accommodated in the timepiece case 7. 8 is a watch band.

  In the above description, the example in which the IC 76 and the crystal can 75 of the receiving circuit block 70 and the IC 86 and the crystal can 85 of the movement module 80 are separately provided has been described. IC (86) and crystal can (85) may also be used. In that case, the IC 86 and the crystal can 85 are omitted, and the circuit block 70 supplied with power from the battery 88 via the connection board 73 directly drives the train wheel drive motor 84 via the connection board 73.

  In the above description, an example in which the secondary magnetic path forming base material structure portion 40 that covers the outer periphery 13 of the coil 10 and is fixed to the outer periphery 13 has a high magnetic resistance portion including the gap 43 and the connecting resin portion 44 has been described. As long as the magnetic resistance between the end portions 14A and 14B of the coil 10 or between the connecting base material structures 24 and 25 can form a secondary magnetic path P2 that is sufficiently larger than the magnetic resistance of the main magnetic path P1, the gap 43 There may not be a high magnetic resistance part. In this case, for example, the magnetic resistance of the sub magnetic path forming base material structure 40 is such that the cross sectional area of the sub magnetic path forming base material structure 40 (area of the cross section perpendicular to the longitudinal direction) is within the cylindrical coil 10. The secondary magnetic path is made to be sufficiently smaller than the cross-sectional area of the main magnetic path forming base material structure 30 (typically, for example, about 1/10 or less, but may be about a fraction). What is necessary is just to form the formation base material structure part 40 thinly. Here, when the inner diameter of the cylindrical coil 10 is about 1 to 2 mm, the thickness of the sub magnetic path forming base material structure 40 is typically 1 mm or less, and preferably about a fraction thereof or Less than that. In addition, instead of covering the entire circumference of the outer peripheral surface of the cylindrical coil 10 in the substantially entire region in the longitudinal direction, the secondary magnetic path forming base material structure portion 40 covers a part of the circumferential coil 10 in a state of covering a part of the circumferential direction. It may extend in the longitudinal direction. In that case, in the remaining portion, the outer peripheral surface of the cylindrical coil 10 may be covered thinly (for example, with a thickness of about 0.1 mm or less) by the layer of the base material 23 instead of being completely exposed.

The antenna structure of one preferable Example by this invention was shown, (a) is plane explanatory drawing of an antenna structure, (b) saw a part of antenna structure of (a) from the outer peripheral surface side. Side surface explanatory drawing, (c) is IC-IC sectional view explanatory drawing of (a), (d) is ID-ID sectional view explanatory drawing of (a). FIG. 2 is an explanatory plan view similar to FIG. 1A for a standard radio wave receiving apparatus in which a receiving circuit block is placed and connected to the antenna structure of FIG. 1. FIG. 2 is an explanatory plan view of an analog quartz movement attached to the central opening of the antenna structure of FIG. 1. FIG. 4 is an explanatory plan view of the radio-controlled timepiece incorporating the standard radio wave receiver of FIG. 2 and the analog quartz movement of FIG. 3 as viewed from the back cover side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Radio wave correction watch antenna structure 2 Radio wave correction receiver 3 Movement frame 5 Radio wave correction clock 7 Clock case 10 Cylindrical coil 11 Tube 12 Inside of tube 13 Outer periphery of coil 14A, 14B End of coil 15A, 15B Opening 16 Winding 16A, 16B Winding end (coil terminal)
17 Longitudinal central part of coil (intermediate part)
20 Movement frame body (module frame body)
20E outer peripheral surface 20F inner peripheral surface 21 magnetic powder 22 resin 23 material (base material)
24, 25 Connection base material structure 26 Opening (recess)
30 Main magnetic path forming base material structure parts 31, 32 End 40 First sub magnetic path forming base material structure parts 41, 42 Outer peripheral sub magnetic path forming part 43 Groove (notch)
44 Connection resin portion 60 Second sub magnetic path forming base material structure portions 61, 62 Arc-shaped sub magnetic path forming base material structure portions 61A, 62A Extended end 64 Receiving circuit block mounting recess portions 65A, 65B Movement module locking Notch 66 for winding true winding (gap)
70 receiving circuit block 71 circuit board 72 receiving circuit circuit board 73 connecting board 74 resonance capacitor group 75 receiving circuit crystal can 76 receiving IC
77A, 77B Antenna connection terminal 80 Movement (movement module)
81 outer circumference 82 winding stem 83 watch wheel train 84 train wheel drive motor 88 batteries B, B1, B2 external magnetic field M central portion P1 in the longitudinal direction of the coil P1 main magnetic path P2, P3 sub magnetic path

Claims (12)

An electromagnetic wave correction watch antenna structure in which a cylindrical coil is embedded in a base material in which magnetic powder is dispersed in a resin,
A main magnetic path forming base material structure filled in a cylinder of the cylindrical coil to form a main magnetic path formed by the base material, the main magnetic structure magnetized by a magnetic field of a standard radio wave; The outer periphery of the cylindrical coil is formed to form a resonance secondary magnetic path that is integrated with the main magnetic path forming base material structure and has a larger magnetic resistance than the main magnetic path at both ends of the cylindrical coil. And a sub magnetic path forming base material structure covering the antenna.   The sub magnetic path forming base material structure includes one end side outer peripheral sub magnetic path forming base material structure covering a region including one end of the cylindrical coil, and the other end of the cylindrical coil. Between the other end side outer peripheral sub magnetic path forming base material structure part covering the region, the cylindrical shape between the one end side outer peripheral sub magnetic path forming base material structure part and the other end side outer peripheral sub magnetic path forming base material structure part The radio-controlled timepiece antenna structure according to claim 1, further comprising a high magnetic resistance portion formed along an outer periphery of the coil.   The antenna structure for a radio wave correction watch according to claim 2, wherein the high magnetic resistance portion includes a gap extending in a ring shape along an outer periphery of the cylindrical coil.   The radio wave correction watch antenna structure according to claim 3, wherein an outer peripheral surface of the cylindrical coil is exposed in the gap.   A second sub magnetic path forming base material structure extending in an arc from at least one end of the main magnetic path forming base material structure and forming a resonance sub magnetic path having a larger magnetic resistance than the main magnetic path; An antenna structure for a radio wave correction timepiece according to any one of claims 1 to 4.   The second sub magnetic path forming base material structure portion includes one and the other arc-shaped sub magnetic path forming base material structure portions extending in an arc shape from one end and the other end of the main magnetic path forming base material structure portion. 6. The radio-controlled timepiece antenna structure according to claim 5, wherein the one and the other arcuate sub-magnetic path forming base material structure portions are opposed to each other through a second gap at their extending ends.   The radio wave correction watch antenna structure according to claim 6, wherein the winding stem is inserted along the second gap.   The radio wave correction watch antenna structure according to any one of claims 5 to 7, wherein the second sub magnetic path forming base material structure includes a base on which a standard radio wave receiving circuit is mounted.   The said main magnetic path formation base material structure part and said 2nd sub magnetic path formation base material structure part are the movement frames which surround a movement as a whole, The description in any one of Claim 5-8 Antenna structure for radio wave correction watch.   The antenna structure for a radio wave correction watch according to any one of claims 5 to 9, wherein the movement frame is arranged along an inner periphery of the watch case.   The antenna structure for a radio wave correction watch according to any one of claims 1 to 10, which is formed by insert molding.   A radio-controlled timepiece comprising the radio-controlled timepiece antenna structure according to any one of claims 1 to 11.

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