JP2010199952A - Antenna device and radiowave receiving equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small and highly sensitive antenna device by a simple technique, and to provide radiowave receiving equipment. <P>SOLUTION: A holding member 75, which includes a holding part 751 for protecting the end of the core 71 and a guide part 755 to be a guide when winding a coil wire material 72a and regulating the end of a coil 72, is covered on the both end parts of the core 71 composed by laminating a plurality of plate-shaped members 71a formed by a magnetic material. The coil 72 is composed by directly winding the coil wire material 72a around a central part of the core 71. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an antenna device and a radio wave receiving device.

  2. Description of the Related Art Conventionally, a radio wave receiving device such as a radio clock that includes an antenna device that receives standard radio waves including time information and automatically corrects the current time is known. For example, as an antenna device for receiving a standard radio wave in a radio timepiece, an antenna device having an antenna structure in which a coil is wound around a core made of amorphous metal, ferrite, or the like, which is a magnetic material having high reception sensitivity, is often used. ing.

The antenna structure has a longer core length and a larger radio wave reception area, and the more the coil is wound, the higher the reception sensitivity is.
By the way, when incorporating an antenna structure into a small radio wave receiving device such as a wristwatch type radio timepiece, because the entire radio wave receiving device is small in size, there is a limit to the storage space of the antenna structure, It is necessary to use an extremely small size antenna structure.

  Therefore, the present applicant has proposed a configuration in which a core is formed by laminating a plurality of plate-like members such as amorphous thin films as a configuration for improving reception sensitivity even when the antenna structure is downsized (for example, a patent). Reference 1).

JP 2008-141387 A

  However, the technique described in Patent Document 1 has the advantage that an antenna device that can be miniaturized can be configured, but on the other hand, the entire core is formed so that the plate-like members constituting the core are not separated. Since the antenna case is housed and the coil is wound from above, there is a problem that the thickness of the coil portion is increased by the thickness of the antenna case.

  Therefore, the present invention has been made in view of the circumstances as described above, and an object thereof is to provide a small antenna device and a radio timepiece having high reception sensitivity by a simple method.

In order to solve the above problem, an antenna device according to claim 1,
A core formed by laminating a plurality of plate-like members made of a magnetic material;
A coil configured by directly winding a coil wire around the center of the core;
A holding member that protects a portion protruding from the coil among the ends of the core, and a guide portion that serves as a guide for winding the coil wire and regulates the end of the coil. It is characterized by having.

The invention according to claim 2 is the antenna device according to claim 1,
The holding member is formed of resin.

The invention according to claim 3 is the antenna device according to claim 1 or 2,
The holding member is formed of a magnetic material obtained by mixing magnetic powder into resin.

The invention according to claim 4 is the antenna device according to any one of claims 1 to 3,
The holding member includes a magnetic gap provided in parallel with the extending direction of the core.

The invention according to claim 5 is the antenna device according to any one of claims 1 to 4,
The core is arranged in the main body case in parallel to the bottom surface of the main body case.

The invention according to claim 6 is the antenna device according to any one of claims 1 to 4,
The said core is arrange | positioned so that it may orthogonally cross with respect to the bottom face of a main body case in a main body case.

Moreover, the invention according to claim 7 is the antenna device according to any one of claims 1 to 4,
The core is characterized in that it is disposed in the main body case at a certain angle with respect to the bottom surface of the main body case.

An invention according to claim 8 is the antenna device according to any one of claims 1 to 7,
The end portions of the plate-like members are laminated so as to be shifted from each other in the extending direction of the core and in a direction parallel to the surface of the plate-like member.

The invention according to claim 9 is the antenna device according to any one of claims 1 to 7,
Each of the plate-like members has a different length in the extending direction of the core, and the end of the extending direction of the core is shifted in a direction parallel to the surface of each of the plate-like members. It is characterized by being arranged to be laminated.

Further, the radio wave receiving device according to claim 10 is:
The antenna device according to any one of claims 1 to 9,
A hollow columnar body case in which the antenna device is disposed,
A transparent member for closing the one end side opening of the main body case;
A closing member for closing the other end side opening of the main body case;
It is characterized by having.

  According to the present invention, since the plate-like member does not fall apart without providing a holding member for holding the entire core, the coil wire can be directly wound around the core. For this reason, it can suppress that the thickness of a coil part becomes thick and can attain size reduction of an antenna apparatus. This makes it possible to incorporate the antenna device into a smaller device.

It is a front view showing a schematic structure of a radio wristwatch which is an example of a radio wave receiving device provided with an antenna device of this embodiment. FIG. 2 is a cross-sectional view of the radio wrist watch shown in FIG. 1 taken along the line II-II. It is a disassembled perspective view which shows the internal structure of the radio-controlled wristwatch shown in FIG. It is a top view which shows the surface side inside of the state which removed the timepiece glass member dial plate and the upper housing among the components of the radio wave wristwatch shown in FIG. It is sectional drawing which shows the antenna apparatus of this embodiment. FIG. 6 is a perspective view of the antenna device shown in FIG. 5. It is sectional drawing which shows an example of the conventional antenna device provided with the holding member which coat | covers the whole core. It is sectional drawing which shows an example of the conventional antenna device provided with the holding member which coat | covers the whole core. It is sectional drawing which shows an example of the conventional antenna device with which the guide member is provided as a different body. It is a perspective sectional view showing a modification of a holding member, (a) shows a U-shaped holding member which has an opening in one end, and (b) shows a holding member which has a slot in the upper part. (A) is typical sectional drawing which shows the state which has arrange | positioned the antenna apparatus of this embodiment so that a core may become parallel with respect to the bottom face of a watch case, (b) is the antenna apparatus of this embodiment. FIG. 2C is a schematic cross-sectional view showing a state in which the core is disposed perpendicular to the bottom surface of the watch case, and FIG. FIG. 4D is a schematic cross-sectional view showing a state in which the antenna device of the present embodiment is arranged so that the core is inclined with respect to the bottom surface of the watch case. FIG. It is sectional drawing which shows the modification of the antenna device of this embodiment. (A) is a side view which shows an example of the core which shifted and laminated | stacked the edge part of the plate member of the same magnitude | size, (b) was shifted and laminated | stacked the edge part of the plate member of a different magnitude | size. It is a side view which shows an example of a core.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of an antenna device and a radio wave receiving apparatus to which the antenna device according to the invention is applied will be specifically described with reference to the drawings. The scope of the present invention is not limited to the illustrated example.

  First, a first embodiment of an antenna device and a radio wave receiver according to the present invention will be described with reference to FIGS. In the present embodiment, a case where an antenna device is mounted on a radio wave wristwatch as a radio wave receiver will be described as an example.

  FIG. 1 is a front view showing a radio-controlled wristwatch provided with an antenna device according to the present invention. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. 3 is an exploded perspective view showing the internal configuration of the radio-controlled wristwatch in FIG.

As shown in FIG. 3, the radio-controlled wristwatch 100 is provided with a main body case (hereinafter referred to as “watch case 1”) formed in a short column shape. The watch case 1 is formed of a metal such as stainless steel or titanium or another conductive member.
The inside of the watch case 1 has a hollow shape whose upper and lower sides are open, and this hollow portion serves as a storage portion that provides a storage space for storing various components.

  Band attachment portions 12 (see FIG. 2) are formed on the upper and lower ends of the watch case 1 in FIG. 1, that is, at the 12 o'clock side end portion and the 6 o'clock direction end portion of the timepiece. A watch band 2 is attached to 12. In addition, a plurality of operation buttons 13 for inputting various operation instructions such as a time setting instruction are provided on the outer periphery of the watch case 1.

  As shown in FIG. 2, on the viewing side (front side: upper side in FIG. 2) of the watch case 1, a transparent formed of glass which is a non-conductive transparent material so as to close the opening on the viewing side. A watch glass member 3 as a member is mounted via a waterproof ring 14. A parting member 4 is disposed along the inner periphery of the watch case 1 inside the watch case 1 and below the watch glass member 3.

  Further, on the side opposite to the viewing side of the watch case 1 (the back side: the lower side in FIG. 2), as shown in FIG. 2, the back as a closing member for closing the lower opening of the watch case 1 is provided. A lid member 5 is attached via a waterproof ring 15. The back cover member 5 is formed of a metal such as stainless steel or titanium or other conductive members.

Further, a housing 6 made of, for example, resin is provided inside the watch case 1. The housing 6 is composed of an upper housing 61 and a lower housing 62. Between the upper housing 61 and the lower housing 62, a clock movement (not shown) and various electronic devices that move the second hand, the minute hand, and the hour hand as the hands 33 are provided. A circuit board 8 on which a component 81 and the like are mounted is disposed. In the housing 6, a motor 82 (see FIG. 2) for driving each part, a battery 83 (see FIG. 4) for supplying power to each functional part of the radio-controlled wristwatch 100, and the like are provided.
The circuit elements mounted on the circuit board 8 include, for example, a control IC such as a CPU that controls each part of the radio wave wristwatch 100, and an electric signal detected by the antenna device 7 that is amplified and demodulated and included in the standard radio wave. There are a receiving circuit that extracts time data, a time measuring circuit that has an oscillator and measures the current time (none of which is shown).
As shown in FIGS. 2 and 4, an antenna holding portion 62 a for holding the antenna device 7 is provided on the lower housing 62 at the 12:00 side of the radio-controlled wristwatch 100. The antenna device 7 is held on the antenna holding portion 62a via an adhesive 65 or the like.

  The housing 6 is supported from the back side of the radio-controlled wristwatch 100 by a housing support member 63 and is fixed in the watch case 1. The housing support member 63 is not an essential component. For example, the housing 6 may be supported by the back cover member 5 without providing the housing support member 63.

In addition, a dial 30 is disposed inside the watch case 1 so as to face the back side of the watch glass member 3 (the lower surface in FIG. 2).
As shown in FIG. 1, twelve hour letter members 31 corresponding to 1 o'clock to 12 o'clock of the timepiece are provided at substantially equal intervals on the peripheral portion on the surface side of the dial 30.

  A shaft hole (not shown) is formed in a substantially central portion of the dial 30, and the pointer shaft 32 protrudes from the back side of the radio-controlled wristwatch 100 to the front side through the shaft hole. A pointer 33 such as an hour hand or a minute hand disposed between the timepiece glass member 3 and the dial 30 is attached to the pointer shaft 32. The timepiece movement moves the pointer 33 attached to the pointer shaft 32 above the dial 30.

  Here, the configuration of the antenna device 7 in the present embodiment will be specifically described with reference to FIGS. 5 and 6.

  As shown in FIGS. 5 and 6, the antenna device 7 includes a long core 71, a coil 72 formed by directly winding a coil wire 72 a around the center of the core 71, and both ends of the core 71. And a pair of holding members 75 for covering the coil 71. When a radio wave transmitted from the outside passes through the core 71, an induced current is generated in the coil 72. The end of the coil wire material 72a constituting the coil 72 is electrically connected to a connection terminal 85 (see FIG. 2) provided on the circuit board 8 via a lead frame 77 described later. The obtained signal is sent to a receiving circuit on the circuit board 8.

  The core 71 is formed of a plurality of plate-like members 71 a arranged so as to overlap with the thickness direction of the housing 6 (that is, the thickness direction of the radio-controlled wristwatch 100). Note that the plurality of plate-like members 71a are preferably fixed to each other with an adhesive or the like so that the laminated state can be maintained. As the adhesive for bonding and fixing the plate-like member 71a, for example, a thermosetting adhesive that is non-conductive and is cured by heat can be suitably used. Note that the adhesive for bonding and fixing the plate-like member 71a is not limited to those exemplified here.

Each plate-like member 71a has a magnetic permeability of an amorphous alloy or the like (refers to a proportional constant μ when the relationship between the magnetic field or the magnetic field strength H and the magnetic flux density B is expressed by B = μ H) Alternatively, it is made of a magnetic material having a high relative magnetic permeability (ratio to the vacuum magnetic permeability μ0 μs = μ / μ0).
The material for forming the core 71 is not limited to an amorphous alloy, and any magnetic material that can be formed into a thin plate shape is applicable.

  As shown in FIG. 5, holding members 75 are covered on both ends of the core 71. The holding member 75 is made of resin, and serves as a guide when the coil wire 72 a is wound around the central portion of the core 71 while holding the end portion of the core 71 protruding from the coil 72 and the coil 72. And a guide portion 755 that regulates the end portion of the head.

  The holding portion 751 includes a recess 752 that has an opening that is slightly larger than the cross-sectional area of the end of the core 71 and accommodates the end of the core 71. The holding portion 751 protects the end portion of the core 71 from damage caused by an external impact by accommodating the end portion of the core 71 formed by laminating the plate-like members 71a in the recess 752. Yes.

In the present embodiment, two connection convex portions 756 are provided upright on the upper surface of the one holding portion 751 (the viewing side of the radio wave wristwatch 100), as shown in FIG. Each of the connecting convex portions 756 is engaged with a lead frame 77 described later.
Note that the position and shape of the connection convex portion 756 are not limited to those shown here. Further, the connecting convex portion 756 may be provided on the holding member 75 on either side. Both the holding members 75 may be provided with connecting convex portions 756 so that flexible connection is possible according to the arrangement of the antenna device 7 and the configuration of the housing 6 in which the antenna device 7 is arranged. .

The guide portion 755 is provided so as to protrude above the holding portion 751 (the viewing side of the radio-controlled wristwatch 100) and to extend in a direction orthogonal to the extending direction of the core 71.
In this embodiment, when the coil wire 72 a is wound around the central portion of the core 71 to form the coil 72, the distance from the guide portion 755 of the holding member 75 on one side to the guide portion 755 of the holding member 75 on the other side is between. It becomes a part which winds, and the both ends of the coil 72 are controlled by the guide part 755. FIG. For this reason, the coil wire 72a does not shift at the end portion of the coil 72, and the coil wire 72a can be neatly wound from end to end.
On the end portion side of the core 71 in the guide portion 755, an abutting portion 757 that is substantially orthogonal to the extending direction of the guide portion 755 and protrudes in the extending direction of the core 71 is formed. A lead frame 77 described later is abutted against the abutting portion 757 so that the lead frame 77 is positioned and fixed.

The lead frame 77 is a thin plate-like member formed in an approximately L-shape, and an engagement hole 77a (see FIG. 6) in which a connecting projection 756 engages with a bent portion of the lead frame 77 or in the vicinity thereof. Is provided. One end side of the lead frame 77 is abutted against the abutting portion 757 and is fixedly positioned. The other end of the lead frame 77 is connected to a connection terminal 85 (see FIG. 2) provided on the circuit board 8. By engaging the connecting projection 756 with the engagement hole 77 a and engaging the end of the coil wire 72 a with the connecting projection 756, the coil 72 is electrically connected to the connection terminal 85 via the lead frame 77. To be connected to.
The engaging portion between the connecting convex portion 756 and the lead frame 77 and the connecting portion between the lead frame 77 and the connection terminal 85 are fixed by, for example, soldering. Note that the connecting projection 756 and the lead frame 77 are not essential, and both ends of the coil wire 72 a may be directly connected to the connection terminal 85.

Next, the operation of the antenna device 7 according to the present embodiment and the radio wave wristwatch 100 including the antenna device 7 will be described.
At the time of assembling the radio-controlled wristwatch 100, first, a plurality of plate-like members 71a are stacked, and fixed with an adhesive so that they are integrated to form the core 71. Next, both end portions of the core 71 are accommodated in the concave portions 752 of the holding member 75, respectively, and both end portions of the core 71 are covered with the holding member 75. Thereafter, the coil wire 72 a is sequentially wound between the guide portion 755 of the holding member 75 on the one side and the guide portion 755 of the holding member 75 on the other side to form the coil 72. Thereby, the antenna device 7 is completed. Further, the lead frame 77 is engaged with the connection convex portion 756 of the holding member 75, and the end portion of the coil wire 72 a is engaged with the connection convex portion 756 to be connected to the lead frame 77.

  Thereafter, the antenna device 7 is placed on the antenna holding portion 62 a of the housing 6. The housing 6 is housed in the watch case 1 while being supported by the housing support member 63, and the back cover member 5 is fitted into the opening on the back side of the watch case 1 to close the opening on the back side. .

When the radio wave wristwatch 100 receives a standard radio wave, the magnetic field component of the radio wave is transmitted through the watch glass member 3, the dial 30, etc., which is a non-conductive member made of a material that does not shield the radio wave, and the antenna device. 7 core 71 is entered. Then, the magnetic flux that has entered the antenna device 7 from the core 71 on one side passes to the end on the other side of the core 71. During this passage, an alternating current is induced in the coil 72 wound around the core 71 (induced current), and an alternating voltage is generated at both ends of the coil 72 accordingly. Then, this AC voltage is sent as an analog reception signal to a reception circuit (not shown).
Then, the reception circuit performs processing such as amplification, demodulation, and decoding on the analog reception signal, and acquires digital time data. The radio wave wristwatch 100 appropriately corrects the current time based on the acquired time data.

  As described above, according to the present embodiment, the plurality of plate-like members 71a constituting the core 71 of the antenna device 7 are fixed with an adhesive or the like, and the plate-like members 71a are configured as a unit. Therefore, the plate-like member 71a does not fall apart even if a holding member that holds the entire core 71 is not provided. For this reason, the coil wire material 72a can be directly wound around the core 71, and it can suppress that the thickness of the coil 72 part becomes thick. Thereby, the antenna device 7 can be stored compactly in a limited space. For this reason, it is possible to reduce the size of the radio-controlled wristwatch 100 incorporating the antenna device 7.

That is, the conventional antenna device includes a core 91, a coil 92, and a holding member 93 that covers and holds the entire core 91 as shown in FIG. In the antenna device shown in FIG. 7, the holding member 93 includes an upper holding member 931 and a lower holding member 932, and both end portions of the upper holding member 931 and the lower holding member 932 protect end portions of the core 91. 933. Further, a substantially central portion of the upper holding member 931 and the lower holding member 932 is a winding portion 934 in which the coil 92 is formed. Between the end protection portion 933 and the winding portion 934, a guide portion 935 is integrally formed that serves as a winding guide when the coil 92 is formed and restricts the end portion of the coil 92.
In such an antenna device, since the coil 92 is formed by winding the coil wire from above the winding portion 934 covering the periphery of the core 91, the thickness of the coil 92 portion is increased, and this is reduced. For this purpose, it has been necessary to take measures such as reducing the number of turns of the coil 92.
Further, for example, as shown in FIG. 8, the holding member 94 includes an end protection portion 943 that protects the end portion of the core 91, a winding portion 944 where the coil 92 is formed, and a winding when forming the coil 92. Even when the upper holding member 941 having the guide portion 945 serving as a line guide and the lower holding member 942 provided only in the portion corresponding to the end protection portion 943 are provided, only the winding portion 944 is provided. The thickness of the coil 92 portion is increased.
In this regard, as in the antenna device 7 shown in the present embodiment, when the holding member 75 is provided only at the end of the core 71 and the coil wire 72a is directly wound around the core 71, FIG. Compared with the case where the conventional configuration shown in FIG. 8 is adopted, the coil 72 portion can be made thinner.

  In the present embodiment, a guide portion 755 serving as a guide when the coil wire 72 a is wound around the central portion of the core 71 is integrally provided on the holding member 75 that protects the end portion of the core 71. Therefore, for example, as shown in FIG. 9, a guide member 955 serving as a guide when winding the coil wire by covering the end portion of the core 91 with a holding member 95 composed of an upper holding member 951 and a lower holding member 952. The number of parts can be reduced as compared with the case where is provided as a separate body. Thereby, cost reduction can be achieved and efficiency of assembly work can be improved.

  In the present embodiment, since the end of the core 71 is protected by the holding member 75, even if an impact from the outside is received, the end of the core 71 is not damaged.

  In addition, since the holding member 75 is made of resin, molding and processing are easy, and even if the holding member 75 is put on the end of the core 71, reception of radio waves by the core 71 is not hindered. The reception sensitivity of the antenna device 7 is not impaired.

  In addition, since the antenna device 7 is disposed in the watch case 1 so that the core 71 is parallel to the bottom surface of the watch case 1, the radio waves entering the watch case 1 through the watch glass member 3 are efficiently transmitted. Can be received.

  In the present embodiment, the case where each holding member 75 is configured by one member is taken as an example, but the configuration of the holding member 75 is not limited thereto. For example, the holding member may be composed of an upper holding member and a lower holding member, and may be configured to hold the end portion of the core 71 between the upper holding member and the lower holding member.

Further, the holding member may be formed of a magnetic material. By forming the holding member from a magnetic material, the holding member plays the role of a magnetic flux collecting member that collects magnetic flux, and the receiving sensitivity can be improved.
In this case, as a material for forming the holding member, for example, a material such as a synthetic resin mixed with a powder (magnetic powder) of a magnetic material such as amorphous or ferrite can be used. Note that applicable magnetic materials are not limited to those exemplified here.

As described above, when the holding member is formed of a magnetic material, the holding member may have conductivity depending on the type and amount of the magnetic powder mixed in the material. If the holding member is conductive, the current that flows through the core flows around the core along the holding member, and even if radio waves are received, loss occurs, and reception sensitivity decreases. There is a risk that.
Therefore, in order to prevent such a loss, a magnetic gap (gap) is formed in a part of the holding member in parallel with the extending direction of the core so that no current flows along the holding member. It is preferable to form.

Specifically, for example, as shown in FIG. 10A, the holding member 97 is formed in a U shape having an opening 97a at one end, and the end of the core 96 is accommodated therein. By providing the opening 97a in this way, the route through which the radio wave that has passed through the core 96 travels around the core 96 along the holding member 97 is blocked by the opening 97a, so that no loss occurs. In addition, when the holding member 97 is formed in a U shape in this way, when the end of the core 71 is stored in the holding member 97, the core 71 can be easily fitted by sliding from the opening 97a. It is possible and convenient.
For example, as shown in FIG. 10B, a groove 98a is provided in a part of the peripheral surface of the holding member 98, and the end of the core 96 is accommodated therein. By providing the groove portion 98a in this manner, the route through which the radio wave that has passed through the core 96 travels around the core 96 along the holding member 98 is blocked by the groove portion 98a, so that no loss occurs.
Note that the method of providing a magnetic gap (gap portion) in the holding member is not limited to the one exemplified here. For example, instead of providing a space such as the opening 97a and the groove 98a, a non-conductive resin or the like may be embedded in a part of the peripheral surface of the holding member 98. By embedding non-conductive resin or the like in this way, the route through which the current flows around the core 96 can be physically cut off, and no loss occurs.

Further, in the present embodiment, as shown in FIG. 11A, the antenna device 7 is disposed so that the core 71 is disposed in the watch case 1 in parallel with the bottom surface of the watch case 1. For this reason, it is possible to efficiently collect radio waves entering from the timepiece glass member 3 side.
The arrangement of the antenna device 7 is not limited to this.
For example, as illustrated in FIG. 11B, the antenna device 7 may be disposed in the watch case 1 so that the core 71 is orthogonal to the bottom surface of the watch case 1. By arranging in this way, the antenna device 7 can be arranged close to the inner wall of the watch case 1, which contributes to space saving in the watch case 1.
Further, for example, as shown in FIGS. 11 (c) and 11 (d), the antenna device is arranged such that the core 71 is disposed in the watch case 1 with a certain angle with respect to the bottom surface of the watch case 1. 7 may be arranged. Thus, by arranging the antenna device 7 at an angle, the volume efficiency is improved, and further space saving can be realized. Further, by providing an angle to the antenna device 7, radio waves entering from the watch glass member 3 side can be collected more efficiently, and reception sensitivity can be improved.

Further, in the present embodiment, the plate-like member 71a itself constituting the core 71 is integrated by fixing with an adhesive, but the configuration in which the core 71 made up of a plurality of plate-like members 71a is integrated is described here. It is not limited to.
For example, without laminating and fixing plate-like members to each other, both ends thereof are inserted into a holding member, and a coil wire is wound between one holding member and the other holding member to form a coil. The core may be integrated by impregnating the coil with an adhesive or the like.

Moreover, although this embodiment demonstrated the case where the core 71 was comprised linearly, a core is not limited to a linear thing.
For example, as shown in FIG. 12, one or several end portions (that is, a portion where the coil 112 is not wound) of the plate-like member 111a constituting the core 111 are bent to form a plurality of end portions of the core 111. You may make it separate. A retaining hole 117 communicating with the recessed portion 115 is formed at one end of the retaining member 113 including the retaining portion 114 having the recessed portion 115 and the guide portion 116, and the plate-shaped member 111 a is formed in the retaining hole 117. Insert the bent part and lock it. By doing in this way, it can be set as the structure where the edge part of the core 111 cannot come off from the holding member 113 easily. In this case, it is preferable that the core 111 is fixed with an adhesive or the like so that the portion housed in the recess 115 and the portion housed in the locking hole 117 are not separated from each other. Furthermore, it is preferable that these cores 111 are bonded and fixed so that the end portions of the cores 111 do not come out of the recesses 115 and the locking holes 117.
The locking hole 117 may be a through hole or a recess that does not penetrate. Further, when the locking hole 117 is a through hole, the end of the core 111 may protrude from the locking hole 117 to the outside.
The locking hole 117 is preferably provided on the surface facing the watch glass member 3 when the antenna device 110 is disposed in the radio wave wristwatch 100. By comprising in this way, an electromagnetic wave can be more efficiently received from the timepiece glass member 3 side.

In the present embodiment, the case where the end portions of the core 71 are aligned has been described as an example, but the end portion of the core may be displaced.
For example, as shown in FIG. 13 (a), a plate-like member 121a of the same size is extended in the direction in which the core 121 extends and parallel to the surface of each plate-like member 121a. The core 121 may be formed by being arranged so as to be slightly shifted from each other.
Further, as shown in FIG. 13B, the plate-like members 131a having different lengths in the extending direction of the core 131 are different, and the end portions in the extending direction of the core 131 are parallel to the surface of each plate-like member 131a. The core 131 may be formed in such a way as to be laminated in a slightly shifted manner.
In this way, by disposing the end portions of the core so as to be displaced, it is possible to configure a core having a length / area greater than that of each plate-like member.

  Examples of the synthetic resin forming the housing 6 include epoxy resin, phenol resin, melamine resin, urea resin, unsaturated polyester resin, polyimide resin, furan resin, polybutadiene resin, ionomer resin, EEA resin, AAS resin ( ASA resin), AS resin, ACS resin, ethylene vinyl acetate copolymer, ethylene vinyl alcohol copolymer resin, ABS resin, vinyl chloride resin, chlorinated polyethylene resin, cellulose acetate resin, fluorine resin, polyacetal resin, polyamide resin 6,66 , Polyamide resin 11,12, polyarylate resin, thermoplastic polyurethane elastomer, liquid crystal polymer, polyether ether ketone, polysulfone resin, polyether sulfone resin, high density polyethylene, low density polyethylene, linear low density polyethylene, polyethylene Resins such as phthalate, polycarbonate resin, polystyrene resin, polyphenylene ether resin, polyphenylene sulfide resin, polybutadiene resin, polypropylene resin, polypropylene resin, methacrylic resin, methylpentene polymer, etc. may be used, and among these, heat resistance and dimensional stability From the viewpoint of strength and the like, phenol resin, epoxy resin and the like are preferable.

  In the above embodiment, the case where the radio wave receiving device to which the antenna device 7 is applied is the radio wave wristwatch 100, but the radio wave receiving device to which the antenna device 7 can be applied is not limited thereto. Any device may be used as long as the device 7 is configured to receive radio waves. For example, the antenna device 7 may be applied to a fixed radio timepiece, a small radio, a portable terminal, or the like.

  In addition, it is needless to say that the present invention is not limited to the above-described embodiments but can be modified as appropriate.

1 Watch case (body case)
DESCRIPTION OF SYMBOLS 6 Housing 7 Antenna apparatus 8 Circuit board 30 Dial 62a Antenna holding part 71 Core 71a Plate-like member 72 Coil 72a Coil wire 75 Holding member 97a Opening 98a Groove part 100 Radio wave wristwatch (Radio wave receiving apparatus)
751 Holding part 755 Guide part

Claims (10)

A core formed by laminating a plurality of plate-like members made of a magnetic material;
A coil configured by directly winding a coil wire around the center of the core;
A holding member that protects a portion protruding from the coil among the ends of the core, and a guide portion that serves as a guide for winding the coil wire and regulates the end of the coil. When,
An antenna device comprising:   The antenna device according to claim 1, wherein the holding member is made of resin.   The antenna device according to claim 1, wherein the holding member is made of a magnetic material obtained by mixing magnetic powder into resin.   The antenna device according to claim 2, wherein the holding member includes a magnetic gap provided in parallel with the extending direction of the core.   The antenna device according to any one of claims 1 to 4, wherein the core is disposed in the main body case in parallel to the bottom surface of the main body case.   The antenna device according to any one of claims 1 to 4, wherein the core is disposed in the main body case so as to be orthogonal to a bottom surface of the main body case.   The antenna device according to any one of claims 1 to 4, wherein the core is disposed in the main body case with a certain angle with respect to a bottom surface of the main body case.   The end portions of the plate-like members are stacked so as to be shifted from each other in the extending direction of the core and in a direction parallel to the surface of the plate-like members. Item 8. The antenna device according to any one of Items 7.   Each of the plate-like members has a different length in the extending direction of the core, and the end of the extending direction of the core is shifted in a direction parallel to the surface of each of the plate-like members. The antenna device according to any one of claims 1 to 7, wherein the antenna device is arranged so as to be stacked. The antenna device according to any one of claims 1 to 9,
A hollow columnar body case in which the antenna device is disposed,
A transparent member for closing the one end side opening of the main body case;
A closing member for closing the other end side opening of the main body case;
A radio wave receiving device comprising:

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