JP5562266B2 - Antenna for electronic watch - Google Patents

Description

  The present invention relates to an antenna for an electronic timepiece disposed inside an electronic timepiece.

  In recent years, watch-type radio-controlled timepieces have become widespread, so that standard radio waves (time-corrected radio waves) are received by an antenna built in the clock, the information is processed, and an accurate time is expressed by a hand drive motor. The function to correct the guidelines has been widely recognized.

  Improving the reception sensitivity to receive standard radio waves is an issue that affects the performance of radio-controlled watches when mounting such functions. There are many issues to be addressed.

  There are many proposals for methods and means for solving such problems. In general, the reception sensitivity can be improved by increasing the size of the antenna, but there may be restrictions between the antenna and other components that constitute the timepiece. In other words, if a metal object typified by the winding part of the antenna and the watch exterior is placed close to the antenna, the magnetic flux generated by the current resonated by the antenna generates an eddy current when it penetrates the metal placed close to the antenna. This action causes a loss.

  In order to avoid this loss, a method is proposed in which a magnetic material is disposed in the vicinity of the antenna so that the magnetic flux generated by the current resonated by the antenna does not penetrate the metal such as the exterior.

  In Patent Document 1, a magnetic member is disposed outside the antenna case in which the antenna is housed so as to cover the winding portion of the antenna, and loss is prevented by this magnetic member.

  Moreover, in patent document 2, the antenna cover which consists of a magnetic member is directly attached to an antenna, and loss is prevented with this antenna cover.

JP 2005-31715 A WO2007 / 111217

  However, in the configuration of Patent Document 1, since the antenna is housed in a box-shaped case in which the entire antenna can be accommodated, the antenna itself needs to have high performance in order to reduce the size of the antenna. Further, the magnetic member covers only the winding portion of the antenna, and eddy current loss is likely to occur in the portion where the magnetic core is exposed from the winding portion.

  In the configuration of Patent Document 2, since the antenna cover made of a magnetic member covers the winding portion and the magnetic cores on both sides thereof, eddy current loss hardly occurs. However, an antenna cover having a substantially rectangular planar shape and the same width as the winding portion covers the winding portion of the antenna and the magnetic cores at both ends thereof. For this reason, the antenna unit composed of the antenna and the antenna cover has a size that depends on the area of the antenna cover, and as a result, occupies much of the limited space in the watch.

An object of the present invention is to solve the above-described problems, suppress generation of eddy currents, and downsize an antenna.

  In order to achieve the above object, an antenna of the present invention includes at least one of a magnetic core, a winding wound around the magnetic core so that the magnetic core is exposed on both sides, and the magnetic core exposed on both sides of the winding. An antenna having a magnetic core covering portion covering a magnetic member and a magnetic member provided with a winding covering portion covering the winding, and the magnetic core covering portion of the magnetic member is narrower than the winding covering portion. A feature is provided.

  According to this configuration, since the magnetic member is not arranged in the space around the magnetic core exposed at both ends of the winding, it is possible to effectively utilize the limited space such as arranging parts other than the antenna in the space without the magnetic member. I can do it. On the other hand, since the magnetic member covers the magnetic core and the winding, the effect of preventing eddy current can be enhanced.

  In the antenna of the present invention, a fixing member for integrating the magnetic member with the magnetic core is provided, and a part of the fixing member is disposed around the narrow portion in the width direction of the magnetic core. It is characterized by.

  According to this configuration, the fixing member for fixing the magnetic member to the magnetic core of the antenna can be disposed around the narrow portion of the magnetic member. For this reason, compared with the case where there is no narrow part, it is possible to reduce the size of the antenna.

Further, in the antenna of the present invention, the fixing member is attached to the magnetic core and a first fixing member provided with an attachment portion of the magnetic member at a position facing the winding and the magnetic core, and the first fixing member and a second fixing member for fixing the member, in the fixing member, the portion that is disposed around the narrow portion is provided in the first fixing member, the positioning portion for positioning the front Symbol magnetic member It is characterized by being.

  According to this configuration, the magnetic member can be positioned with respect to the first fixing member that holds the magnetic member in the space near the narrow portion of the magnetic member. Thereby, it is possible to reduce the size of the antenna.

  Further, the positioning portion of the first fixing member is provided with a fixing portion that fixes the first fixing member to the second fixing member.

  According to this configuration, the first fixing member can be fixed to the second fixing member using the space near the narrow portion, and the antenna can be downsized.

  In addition, the first fixing member is formed in a shape that covers the magnetic member and cuts out a portion located around the narrow width portion.

  According to this configuration, the antenna can be arranged near the outer periphery of the substantially circular timepiece movement, and the parts of the movement can be arranged efficiently.

In the antenna of the present invention, the width of the magnetic member of the winding covering portion is not less than the width of the magnetic core of the winding covering portion and not more than the winding width of the winding, and the magnetic core covering portion The width of the narrow portion is less than or equal to the width of the magnetic core of the magnetic core covering portion.

According to this configuration, since the magnetic member is within the plane projection portion of the magnetic core and the winding, the size of the antenna in the plane direction depends on the size of the magnetic core and the winding. For this reason, the limited space around the antenna can be effectively utilized while obtaining the above eddy current prevention effect.

  Further, the antenna is incorporated in a watch movement having a circular outer shape, and the antenna is arranged near the outer periphery of the watch movement.

  According to this configuration, by disposing the antenna in the vicinity of the movement outer periphery, other parts can be efficiently arranged from the movement center, and as a result, the movement can be downsized.

  According to the present invention, in the magnetic member having the winding covering portion covering the winding portion of the antenna and the magnetic core covering portion covering the magnetic cores coming out from both ends of the winding portion of the antenna, the magnetic core covering portion is more than the winding covering portion. By providing the narrow narrow portion, the effect of preventing eddy current can be obtained, and the antenna can be downsized.

FIG. 1A is a plan view of a magnetic core, an insulating tape, and a winding according to the first embodiment of the present invention, and FIG. 1B is a view of fixing the end of the magnetic core according to the first embodiment of the present invention. It is a figure explaining attachment of a member. It is a top view of the magnetic member in a 1st embodiment of the present invention. FIG. 3A is a perspective view of the antenna as viewed from the magnetic member side in the first embodiment of the present invention, and FIG. 3B is an external view of the antenna and the watch movement in the first embodiment of the present invention. It is a figure for demonstrating positional relationship. It is the top view and back view of the 2nd fixing member used by the antenna side in 2nd Embodiment of this invention. It is the top view, back view, and side view of the 1st fixing member used by the magnetic member side in 2nd Embodiment of this invention. FIG. 6A is a plan view of an antenna according to the second embodiment of the present invention, and FIG. 6B is a plan view of a circuit board according to the second embodiment of the present invention. It is a perspective view of the antenna in 2nd Embodiment of this invention. FIG. 8A is a plan view of the main part of the ground plane in which the antenna is incorporated in the second embodiment of the present invention, and FIG. 8B is a state in which the antenna is incorporated in the ground plane in the second embodiment of the present invention. It is a top view.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1A is a plan view of a magnetic core, an insulating tape, and a winding according to the first embodiment of the present invention, and FIG. 1B is a view of fixing the end of the magnetic core according to the first embodiment of the present invention. FIG. 2 is a diagram for explaining attachment of a member, and FIG. 2 is a plan view of a magnetic member in the first embodiment of the present invention. FIG. 3A is a perspective view of the antenna as viewed from the magnetic member side in the first embodiment of the present invention, and FIG. 3B is an external view of the antenna and the watch movement in the first embodiment of the present invention. It is a figure for demonstrating positional relationship.

  The first embodiment will be described with reference to FIGS.

Reference numeral 1 in FIG. 3A is an antenna, and this antenna 1 is composed of a bar-shaped magnetic core 3, an insulating tape 4, and an insulating tape 4, as shown in FIGS. 1A and 1B. The winding 5 is wound around and coiled, the fixing member 2, and the magnetic member 7 shown in FIG. The magnetic core 3 is formed of a laminated amorphous thin plate or a magnetic member such as ferrite. The width of the magnetic core 3 is W1, and the winding width of the winding 5 is the width of W2 wider than the magnetic core 3. The winding length of the winding 5 is L2, and the magnetic core 3 is exposed on both sides of the winding 5 by the length of L1. As shown in FIG. 1B, a substantially rectangular parallelepiped fixing member 2 made of a nonmagnetic member such as plastic is bonded and fixed to both ends of the magnetic core 3. The magnetic member 7 shown in FIG. 2 is a plate-like member in which a plurality of amorphous thin plates are stacked, and is arranged so as to cover the magnetic core 3 and the winding 5 in a plane as shown in FIG. It is fixed to the fixing member 2 at the end of the adhesive.

  In the magnetic member 7, the width W 4 of the central portion 8 is substantially the same as the width W 2 of the portion of the winding 5, and the width W 3 of both end portions of the magnetic member 7 is slightly narrower than the width W 1 of the magnetic core 3. The length of the central portion 8 of the width of W4 is L4 which is longer than the winding length L2 of the winding 5, and the length of both ends of the magnetic member 7 is the magnetic core 3 on both sides of the winding 5. L3 is shorter than the exposed length L1.

  In the magnetic member 7, the portion in the range of the length L 2 is a winding covering portion that covers the winding 5, and the portion in the range of the length L 4 -L 2 and the portion in the range of the length L 3 are the magnetic core 3. It is a magnetic core coating part to cover. In the magnetic core covering portion, the narrow width portion 9 is a portion in the range of L3 having a width W3 that is narrower than the winding covering portion having the width W4.

  The antenna 1 is housed inside the wristwatch. For example, it is arranged toward a metal back cover of a wristwatch or a metal case to which the back cover is attached. With such an arrangement, the magnetic flux generated in the antenna is prevented from flowing to the metal case or back cover by flowing through the magnetic member 7 that is less likely to generate eddy currents. As a result, the metal case or back cover is prevented. It is possible to prevent eddy current loss that occurs due to the flow of magnetic flux.

  The narrow width portion 9 of the magnetic member 7 is narrower than the central portion 8, but has a width that can substantially cover the magnetic core 3 exposed from both sides of the winding 5. The suppressing effect is the same as that of the antenna disclosed in Patent Document 2. Further, as compared with the conventional case where the width of the magnetic core covering portion of the magnetic member 7 is set to W4 which is the same as the width of the winding covering portion, the antenna 1 is provided by the amount of the narrow width portion 9 provided in the magnetic core covering portion. The planar projection area is reduced, and the antenna 1 is reduced in size. Further, by making the width W2 of the portion of the winding 5 or the width W1 of the magnetic core 3 and the widths W4 and W3 of the magnetic member 7 substantially the same or narrower, the magnetic member 7 is made to have the magnetic core 3 and the winding. Thus, the antenna 1 can be reduced in size.

  By providing the narrow portion 9 in the portion of the magnetic member 7 that covers the magnetic core 3, spaces a to d shown in FIG. 3A can be secured around the magnetic core 3 in the width direction.

  Then, parts other than the antenna 1 can be arranged in this space. For example, as shown in FIG. 3B, the circuit board 50 of the electronic timepiece provided at substantially the same cross-sectional height as the magnetic member 7 is provided with projecting portions 50a and 50b that project to the spaces b and d. The area of can be expanded. Further, in order to fix the antenna 1 in the wristwatch, four hooks extending in the thickness direction of the antenna 1 from portions located in the spaces a to d are provided on a ground plate (not shown) on which the antenna 1 is arranged, and the tip of the hook It is also possible to form an engaging claw toward the narrow width portion 9 and engage the engaging claw with the surface of the magnetic member 7.

  In particular, wristwatches often have a circular outer shape in plan view of the dial, and in this case, the movement of the wristwatch is often circular or nearly circular. When the magnetic core 3 is substantially linear as shown in FIG. 3A or is curved in an arc shape and its curvature is smaller than the curvature of the outer periphery of the movement, the end of the magnetic core 3 is It is located near the outer periphery of the movement rather than the part. Therefore, when the movement parts are efficiently arranged by bringing the antenna as close to the outer periphery of the movement as possible, the extent to which the antenna can be moved to the outer periphery of the movement depends on the shape of the end of the antenna.

In the antenna shown in FIG. 3A, even if the magnetic core is linear, both ends of the antenna are narrowed, and spaces a and c are secured. As shown in FIG. 3, the antenna can be arranged close to the outer periphery of the movement.

  In the case of this embodiment, the magnetic core 3 exposed from the antenna 1 is linear, but may be curved in an arc as described above. Further, the range in which the magnetic member 7 covers the magnetic core 3 may not be up to the tip of the magnetic core 3, and may be a length up to the middle of the magnetic core 3 as long as a practical eddy current prevention effect can be obtained. Further, although the magnetic member 7 covers only one direction of the antenna 1 (the back cover side of the finished watch), not only this direction but also the side surface (the case side of the finished watch) may cover two sides. Good.

  Further, in order to bring the antenna as close as possible to the outer periphery of the movement, when the narrow portion is provided in the magnetic member 7, only the portions close to the outer periphery of the movement at both ends of the magnetic member 7 may be cut out. For example, the parts a and c in FIG. 3A are not cut out because the magnetic member 7 is cut as shown in FIG. 3 and the parts b and d in FIG. 3 are separated from the outer periphery of the movement. It can also be configured as follows.

  The width of the central portion 8 of the magnetic member 7 is not limited to W4, and may be set wider than the magnetic core 3 and narrower than the winding 5 as long as eddy current loss can be practically suppressed. In order to improve the effect of preventing current loss, the width may be wider than that of the winding 5 or the magnetic core 3.

  In any case, by providing the magnetic member 7 with the narrow width portion 9 and making the area where the magnetic member 7 covers the antenna 1 the minimum necessary for preventing eddy current loss, it cannot be used conventionally. The spaces a to d around the narrow portion 9 of the magnetic member can be used. As a result, the antenna can be miniaturized, and further, the movement incorporating the antenna can be miniaturized.

  Next, 2nd Embodiment is described using FIGS.

  4 and 5 are drawings of a first fixing member and a second fixing member, respectively, used when fixing the magnetic member to the antenna side in the second embodiment of the present invention, and FIG. 4 is used on the antenna side. FIG. 5 is a plan view, a rear view, and a side view of the first bottom part goods used on the magnetic member side. FIG. 6A is a plan view of an antenna according to the second embodiment of the present invention, FIG. 6B is a plan view of a circuit board according to the second embodiment of the present invention, and FIG. FIG. 8A is a perspective view of an antenna in the second embodiment, FIG. 8A is a plan view of the main part of a ground plane incorporating the antenna in the second embodiment of the present invention, and FIG. 8B is a second embodiment of the present invention. It is a top view of the state which incorporated the antenna in the ground plane in a form.

  The second embodiment uses a fixing member that covers the entire magnetic member in order to integrate the magnetic member into the antenna, and a circuit board for connecting the winding to the main circuit board of the wristwatch incorporating the antenna. It is integrated with the antenna. The same configurations as those in the first embodiment are given the same numbers, and the description thereof is omitted.

FIG. 5 shows a first fixing member 10 which is one of the fixing members for integrating the magnetic member 7 with the magnetic core 3. The first fixing member 10 is made of a nonmagnetic member such as plastic. Moreover, as shown to Fig.5 (a)-(c), the 1st fixing member 10 is a elongate plate shape, and the four corners are diagonally cut by planar view, and the taper part 15 is formed. Further, as shown in FIG. 5B, convex portions 13 are formed at four corners on one surface of the first fixing member 10, and bosses 12 are formed at three positions of the convex portions 13. ing. A portion excluding the four corners is the arrangement portion 14 of the magnetic member 7. As shown by a dotted line in FIG. 5B, the magnetic member 7 is fixed to the magnetic body arranging portion 14 with an adhesive or the like. When the magnetic member 7 is housed in the first fixing member 10, the convex portion 13 of the first fixing member 10 is disposed around the narrow width portion 9 of the magnetic member 7. The magnetic member 7 can be positioned by the convex portion 13, and the first fixing member 20a and 20b are used by the convex portion 13 and the boss 12 provided on the convex portion 13 as will be described later. It is also possible to integrate 10 with the magnetic core 3. The other surface of the first fixing member 10 is formed flat as shown in FIG.

  FIG. 4 shows second fixing members 20 a and 20 b which are one of fixing members for integrating the magnetic member 7 with the magnetic core 3. Similarly to the first fixing member 10, the second fixing members 20 a and 20 b are also made of a nonmagnetic member such as plastic. On one surface of the second fixing member 20a, as shown in FIG. 4A, a hole 24 for attaching the boss 12 of the first fixing member 10, and a circuit board arrangement portion 25 for arranging a circuit board 30 to be described later, Circuit board positioning portions 21a to 21c for positioning the circuit board 30 are provided, and the other surface of the second fixing member 20a is provided with a magnetic core mounting recess 23 for mounting to the magnetic core 3 as shown in FIG. Is provided. Moreover, the hole 24 which attaches the boss | hub 12 of the 1st fixing member 10 is provided in one surface of the 2nd fixing member 20b, and as shown in FIG.5 (b) in the other surface of the 2nd fixing member 20b. Further, a magnetic core mounting recess 23 for mounting on the magnetic core 3 is provided. Further, the second fixing members 20 a and 20 b are provided with a winding width defining portion 27 that defines the winding width of the winding 5. The second fixing member 20 a is disposed at one end of the magnetic core 3, and the second fixing member 20 b is disposed at the other end of the magnetic core 3.

  The boss 12 of the first fixing member 10 is provided on the convex portion 13 of the first fixing member 10 provided on both sides of the narrow width portion 9, and the holes 24 of the second fixing members 20a and 20b are positions facing the boss 12. The boss 12 and the hole 24 are located on the side of the magnetic core 3 in the cross-sectional height direction of the antenna 1 (the cross-sectional height position of the magnetic member 7 and the magnetic core 3) rather than the spaces ad on both sides of the narrow width portion 9. Between the cross sectional height positions). Therefore, not only the spaces a to d on both sides of the narrow width portion 9 but also the space in the vicinity thereof can be effectively used without becoming a dead space.

  The second fixing member 20a is provided with a recess 22 through which two winding end portions (not shown) drawn from the winding 5 are passed, and a protrusion 22a that separates the recess 22 into two.

  As shown in FIGS. 6 and 7, a circuit board 30 is attached to the second fixing member 20a. The circuit board 30 is configured by a flexible board. The circuit board 30 is provided with connection terminals 32 a and 32 b connected to the winding 5 and connection terminals 33 a and 33 b for soldering the winding 5. Corresponding to the positioning portions 21a and 21b of the second fixing member 21a, the circuit board 30 is provided with positioned portions 34a and 34b for positioning on the second fixing member 20a.

  Since the positioning portion 21a of the second fixing member utilizes the space on the magnetic core 3 side in the cross-sectional height direction of the antenna 1 rather than the space b on both sides of the narrow width portion 9, the positioning portions 21a on both sides of the narrow width portion 9 Not only the space but also the nearby space can be effectively utilized without becoming a dead space.

  The two winding terminal portions of the winding 5 are soldered to the connection terminals 33 a and 33 b of the circuit board 30 through the both sides of the boss 22 a in the recess 22.

  When the winding terminal portion of the winding 50 is soldered to the connection terminal 33a, the height of the solder reaches the side surface of the first fixing member 10. If the first fixing member 10 covers this portion, The first fixing member 10 cannot be fixed to the second fixing member 20a due to the thickness of the solder. In order to be able to fix the first fixing member 10 to the second fixing member 20a, as shown in FIG. 6A, a taper 15 is provided on the first fixing member 10 in the vicinity of the connection terminal 33a. The first fixing member 10 has a shape that does not cover the solder of the connection terminal 33a.

  As in the first embodiment, the antenna 1 ′ shown in FIG. 7 is built in the wristwatch.

  As shown in FIG. 8A, an antenna arrangement portion 41 is formed on the ground plane 40 which is a timepiece movement component. The antenna placement portion 41 is a recess or a hole. In addition, antenna fixing holes 42a and 42b are provided at positions corresponding to the fixing convex portions 26a and 26b provided in the first fixing members 20a and 20b.

  As shown in FIG. 8 (b), the antenna 1 'is arranged on the antenna arrangement portion 41 of the ground plane 40, and the antenna 1' is fixed to the ground plane by fitting the fixed convex portions 26a and 26b into the antenna fixing holes 42a and 42b. 40 is fixed.

  The antenna 1 ′ is disposed so that the magnetic member 7 faces a metal back cover attached to a metal case of a watch (not shown). Then, the connection terminals 32a and 32b of the circuit board 30 are connected to the main circuit board 50 'of the timepiece movement. The main circuit board 50 ′ of the watch movement has a part of its outer shape indicated by a dotted line.

  A part 50 a ′ of the circuit board 50 is formed in a shape along the tapered portion 15 of the first fixing member 10. As a result, the area of the circuit board 50 ′ can be increased as compared with the case where the tapered portion 15 is not provided.

  As compared with the case where the circuit board 30 is incorporated in the wristwatch separately from the antenna, the circuit board 30 is easily incorporated by integrating the circuit board 30 with the antenna 1 ′.

  In this embodiment, the first fixing member 10 and the second fixing members 20a and 20b are fixed to the boss 12 and the hole 24, but the first fixing member 10 and the second fixing member 20a are fixed. , 20b may be provided with surfaces in contact with each other, and the surfaces may be fixed with an adhesive. Furthermore, as long as the 1st fixing member 10 and the 2nd fixing members 20a and 20b are fixed, methods other than the above-mentioned description may be sufficient.

  In the antenna 1 shown in the first embodiment, the magnetic member 7 is bonded and fixed to the magnetic core 3 with only the fixing member 2. However, depending on the size and shape of the antenna 1 and the magnetic member 7, the magnetic member 7 is bonded. Positioning may not be easy, and the impact resistance of the magnetic member 7 may be a problem. On the other hand, the magnetic member 7 is fixed to the first fixing member 10 as in the second embodiment, and the magnetic member 3 and the winding 5 are magnetically coupled to the first fixing member 10 and the second fixing members 20a and 20b. These problems can be solved by positioning 7.

  In the conventional antenna structure, the space around the narrow portion 9 of the magnetic member 7 is not used, and is a useless space. In this embodiment, the convex portions 13 of the first fixing member 10 for positioning the magnetic member 7 are arranged on both sides of the narrow width portion 9 to effectively use the spaces on both sides of the narrow width portion 9 and the convex portions 13. By providing the boss 12 provided in the boss 12 and the boss hole 24 of the second fixing member at a position corresponding to the boss 12, the space on both sides of the narrow width portion 9 and the space around it are also effectively utilized. The antenna 1 ′ can be made smaller than the conventional antenna structure.

  Further, the circuit board 30 shown in FIGS. 6 and 7 is connected to the winding 5 and fixed to the second fixing member 20a which is one of the fixing members. When the circuit board 30 is fixed to the second fixing member 20a, the position with respect to the second fixing member 20a is determined. The positioning is performed by the positioning portion 21a disposed around the narrow width portion 9 of the magnetic member 7 and the second fixing member 20a. This is performed by a positioning portion 21b provided at the end of the fixing member 20a.

  By positioning at the portion disposed around the narrow width portion 9, it is possible to save waste of space compared to positioning by other methods (for example, a fixing boss is taken out from any one of the fixing members). As a result, the antenna 1 ′ can be downsized.

  In addition, tapered portions 15 are formed at the four corners of the first fixing member 10. When there is no taper portion 15, when the antenna 1 ′ is brought closer to the movement outer periphery, the corners of the four corners of the first fixing member 10 reach the movement outer periphery in that the antenna 1 ′ is closest to the movement outer periphery. is there. On the other hand, when the tapered portion 15 is formed, as shown in FIG. 8, the antenna 1 'can be arranged closer to the outer periphery of the movement as much as the corner portion is eliminated. As a result, the movement parts can be arranged efficiently, and the movement can be downsized. The taper portion 15 can be formed in the first fixing member 10 because the narrow width portion 9 is provided in the magnetic member 7 and the spaces b and d are provided.

  When the magnetic member 7 can be positioned on the first fixing member 10 without the convex portion 13 of the first fixing member 10, the bosses 12 are directly provided on both sides of the narrow width portion 9 without providing the convex portion 13. It may be provided. In this case, the bosses 12 are provided in the spaces a to c on both sides of the narrow width portion 9 to effectively use these spaces.

  In this embodiment, the circuit board 30 is fixed to the second fixing member 20a, but may be positioned and fixed by the first fixing member 10.

DESCRIPTION OF SYMBOLS 1, 1 'Antenna 2 Fixing member 3 Magnetic core 4 Insulation tape 5 Winding 7 Magnetic member 8 Center part 9 Narrow width part 10 1st fixing member 12 Boss 13 Convex part 14 Magnetic body arrangement | positioning part 15 Tapered part 20a, 20b 2nd fixing Member 21a, 21b Circuit board positioning part 23 Magnetic core mounting recess 24 Hole 25 Circuit board placement part 26a, 26b Fixed convex part 27 Winding width defining part 30 Circuit board 34a, 34b Circuit board positioning part 40 Ground plane 41 Antenna placement part 42a, 42b Antenna fixing hole

Claims (7)

A magnetic core, a winding wound around the magnetic core such that the magnetic core is exposed on both sides, a magnetic core covering portion covering at least a part of the magnetic core exposed on both sides of the winding, and a winding covering the winding In an antenna having a magnetic member provided with a covering portion,
An antenna for an electronic timepiece, characterized in that a narrow width portion narrower than the winding covering portion is provided in the magnetic core covering portion of the magnetic member. The antenna has a fixing member for integrating the magnetic member with the magnetic core,
The antenna for an electronic timepiece according to claim 1, wherein a part of the fixing member is disposed around the narrow portion in the width direction of the magnetic core. The fixing member includes a first fixing member provided with an attachment portion for the magnetic member at a position facing the winding and the magnetic core, and a second fixing member attached to the magnetic core and fixing the first fixing member. And
Wherein the fixing member, the portion that is disposed around the narrow portion, the first provided on the fixed member, electrons according to claim 2, characterized in that a positioning portion for positioning the front Symbol magnetic member Watch antenna.
  The antenna for an electronic timepiece according to claim 3, wherein a fixing portion for fixing the first fixing member to the second fixing member is provided in the positioning portion of the first fixing member.   5. The electron according to claim 3, wherein the first fixing member covers the magnetic member and is formed in a shape in which a portion located around the narrow portion is cut out. Watch antenna. The width of the magnetic member of the winding covering portion is not less than the width of the magnetic core of the winding covering portion and not more than the winding width of the winding,
The antenna for an electronic timepiece according to any one of claims 1 to 5, wherein a width of the narrow portion of the magnetic core covering portion is equal to or less than a width of the magnetic core of the magnetic core covering portion.
  The antenna for an electronic timepiece according to any one of claims 1 to 6 is incorporated in a timepiece movement having a circular outer shape, and the antenna for the electronic timepiece is arranged near an outer periphery of the timepiece movement. Electronic clock.

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