JP6825226B2 - Antenna device and manufacturing method of antenna device - Google Patents

Description

The present invention relates to an antenna device and a method for manufacturing the antenna device.

In recent years, smart key systems have been put into practical use in vehicles such as automobiles and houses. This smart key system sends and receives information about ID codes and the like wirelessly as electromagnetic waves, and when the ID codes and the like are collated, it locks doors in vehicles and houses, for example, without using mechanical keys. It is possible to unlock and start and stop the engine. In such a smart key system, an antenna device including a coil antenna is used for transmitting and receiving information.

In recent years, such an antenna device has been required to have a wide band capable of transmitting and receiving stable radio signals in a wide frequency band. In this case, by setting a wide allowable characteristic range for transmitting and receiving wireless signals, even if the characteristics of the individual antenna devices vary, they are kept within the allowable range. As a result, the design of the antenna device can be simplified and the degree of freedom can be improved.

As this antenna device, there is one disclosed in Patent Document 1. Patent Document 1 discloses a technique relating to a communication device used in a keyless entry system. This communication device changes the code length of the diffusion code used for spectral diffusion and changes the Q value of the antenna according to the noise condition in the usage environment. As a result, long-distance communication in a narrow band and short-distance communication in a wide band are realized with the same antenna.

Japanese Unexamined Patent Publication No. 2008-258817

By the way, according to the technical content disclosed in Patent Document 1, the fluctuation of the Q value of the antenna device is realized by changing the resistance value of the antenna resonance circuit. However, in a configuration in which resistance elements are connected in series to the antenna device, if the resistance value is increased in order to satisfy a desired Q value, the circuit structure may become complicated. In addition, the vehicle body is often different for each vehicle type, but in order to select a Q value suitable for the vehicle body, it is necessary to use resistance elements having various resistance values. Therefore, inventory control of parts becomes complicated and costs increase. Therefore, an antenna device having a desired Q value while having a simple configuration is desired.

Further, if the temperature changes when the antenna device is used, the Q value may fluctuate. If the Q value fluctuates due to a temperature change in this way, there is a problem that a separate adjustment may be required for the entire system in which the antenna device is installed.

The present invention has been made in view of this problem, and an object of the present invention is an antenna device and an antenna device capable of suppressing fluctuations in the Q value due to temperature changes, even though the configuration is simple. It is intended to provide a manufacturing method for the above.

In order to solve the above problems, an aspect of the first antenna device of the present invention includes a coil formed by winding a core formed of a magnetic material, a conductive wire on the outer peripheral side of the core and the coil, When a flat plate-shaped eddy current generating means arranged on the outer peripheral side of the core is provided and a coil is provided while the eddy current generating means does not exist, the Q value (No. 3) representing the sharpness of the peak of resonance by the coil. The 1Q value (referred to as 1Q value) decreases as the temperature rises based on the temperature change of the resistance value of the conducting wire, and when the eddy current generating means is provided, the Q value (third) representing the sharpness of the peak of resonance by the eddy current generating means. (2Q value) is a Q value (adjustment) that increases with temperature rise due to current fluctuations corresponding to temperature changes in the resistance value of the eddy current generating means, and represents the sharpness of the peak of resonance based on the coil and the eddy current generating means. The rate of increase / decrease in the temperature rise of (Q value) is provided so as to be smaller than the rate of increase / decrease in the temperature rise of the first Q value and the rate of increase / decrease in the temperature rise of the second Q value. (However, an antenna device having a temperature difference generating means that causes a temperature difference between the antenna main body portion including the core and the coil and the eddy current generating means) is provided.

Further, one side surface of the second antenna device of the present invention is arranged on the outer peripheral side of the core, the core formed of a magnetic material, the coil formed by winding a lead wire around the core and the outer peripheral side of the coil, and the outer peripheral side of the core. When a flat plate-shaped eddy current generating means and a coil are provided while the eddy current generating means does not exist, the Q value (referred to as the first Q value) representing the sharpness of the peak of resonance by the coil is , The Q value (referred to as the second Q value) representing the sharpness of the peak of resonance by the eddy current generating means is provided, which decreases with the temperature rise based on the temperature change of the resistance value of the conducting wire. , Q value (adjusted Q value) that increases with temperature rise due to current fluctuation corresponding to the temperature change of the resistance value of the eddy current generating means and represents the sharpness of the peak of resonance based on the coil and the eddy current generating means. The rate of increase / decrease in the temperature rise is provided so as to be smaller than the rate of increase / decrease in the temperature rise of the first Q value and the rate of increase / decrease in the temperature rise of the second Q value, and the eddy current generating means includes a non-magnetic metal layer. Provided is an antenna device characterized by being a winding portion formed by winding a film-like member.

Further, on the other side of the antenna device of the second invention, in addition to the above invention, the sheet-like member is a copper tape provided with a copper foil layer, and the winding portion winds the copper tape. It is preferable that the copper tape winding portion is formed by the above.

Further, in addition to the above-described invention, it is preferable that the winding portion of the second side of the antenna device of the present invention is located at a portion near both ends in the longitudinal direction of the core.

Further, one side surface of the third antenna device of the present invention is arranged on the outer peripheral side of the core, the core formed of a magnetic material, the coil formed by winding a wire around the core and the outer peripheral side of the coil, and the outer peripheral side of the core. The Q value (referred to as the first Q value) representing the sharpness of the peak of resonance by the coil is the case where the flat plate-shaped eddy current generating means is provided and the coil is provided while the vortex current generating means does not exist. , The Q value (referred to as the second Q value) representing the sharpness of the peak of resonance by the eddy current generating means is provided, which decreases with increasing temperature based on the temperature change of the resistance value of the conducting wire. , Q value (adjusted Q value) that increases with temperature rise due to current fluctuation corresponding to the temperature change of the resistance value of the eddy current generating means and represents the sharpness of the peak of resonance based on the coil and the eddy current generating means. The rate of increase / decrease in the temperature rise is provided so as to be smaller than the rate of increase / decrease in the temperature rise of the 1st Q value and the rate of increase / decrease in the temperature rise of the 2nd Q value, and the resistance element is connected in series to the series resonance circuit including the coil. An antenna device is provided in which the diameter of the conducting wire constituting the coil is reduced so as to have at least a part of the resistance value of the resistance element as compared with the case of the above-mentioned configuration.

A fourth aspect of the antenna device of the present invention is a core formed of a magnetic material and a coil formed by winding a lead wire having a diameter of 0.1 mm or less on the outer peripheral side of the core and the coil. , A flat plate-shaped eddy current generating means arranged on the outer peripheral side of the core, and when the coil is provided while the eddy current generating means does not exist, the Q value indicating the sharpness of the peak of resonance by the coil ( The first Q value (referred to as the first Q value) decreases as the temperature rises based on the temperature change of the resistance value of the conducting wire, and when the eddy current generating means is provided, the Q value (referred to as the first Q value) represents the sharpness of the peak of resonance by the eddy current generating means. The second Q value (referred to as the second Q value) increases with the temperature rise due to the current fluctuation corresponding to the temperature change of the resistance value of the eddy current generating means, and represents the sharpness of the peak of resonance based on the coil and the eddy current generating means (referred to as the second Q value). The rate of increase / decrease in the temperature rise of (adjusted Q value) is provided so as to be smaller than the rate of increase / decrease in the temperature rise of the first Q value and the rate of increase / decrease in the temperature rise of the second Q value. Equipment is provided .

Further, one side surface of the fifth antenna device of the present invention is arranged on the core and the outer peripheral side of the coil, the core formed by winding the lead wire around the outer peripheral side of the core, and the coil formed by winding the lead wire on the outer peripheral side of the core. A Q value (No. 3) representing the sharpness of the peak of resonance by the coil when a coil is provided while the eddy current generating means does not exist and is provided with an interval maintaining portion that defines the distance from the eddy current generating means. The 1Q value (referred to as 1Q value) decreases with increasing temperature based on the temperature change of the resistance value of the conducting wire, and when the eddy current generating means exists, the Q value (third) representing the sharpness of the peak of resonance by the eddy current generating means. (2Q value) is a Q value (adjustment) that increases with temperature rise due to current fluctuations corresponding to temperature changes in the resistance value of the eddy current generating means, and represents the sharpness of the peak of resonance based on the coil and the eddy current generating means. The rate of increase / decrease in the temperature rise of (Q value) is provided so as to be smaller than the rate of increase / decrease in the temperature rise of the first Q value and the rate of increase / decrease in the temperature rise of the second Q value. (However, an antenna device having a temperature difference generating means that causes a temperature difference between the antenna main body portion including the core and the coil and the eddy current generating means) is provided.
Further, one side surface of the sixth antenna device of the present invention is arranged on the core and the outer peripheral side of the coil, the core formed from the magnetic material, the coil formed by winding the lead wire on the outer peripheral side of the core, and the outer peripheral side of the core. A Q value (No. 3) representing the sharpness of the peak of resonance by the coil when a coil is provided while the eddy current generating means does not exist and is provided with an interval maintaining portion that defines the distance from the eddy current generating means. The 1Q value (referred to as 1Q value) decreases with increasing temperature based on the temperature change of the resistance value of the conducting wire, and when the eddy current generating means exists, the Q value (third) representing the sharpness of the peak of resonance by the eddy current generating means. (2Q value) is a Q value (adjustment) that increases with temperature rise due to current fluctuations corresponding to temperature changes in the resistance value of the eddy current generating means, and represents the sharpness of the peak of resonance based on the coil and the eddy current generating means. The rate of increase / decrease in the temperature rise of (Q value) is provided so as to be smaller than the rate of increase / decrease in the temperature rise of the first Q value and the rate of increase / decrease in the temperature rise of the second Q value, and the eddy current generating means is not used. Provided is an antenna device characterized in that it is a winding portion formed by winding a film-like member provided with a magnetic metal layer.
Further, one side surface of the seventh antenna device of the present invention is arranged on the core and the outer peripheral side of the coil, the core formed of the magnetic material, the coil formed by winding a wire around the outer peripheral side of the core, and the outer peripheral side of the core and the coil. A Q value (No. 1) representing the sharpness of the peak of resonance by the coil when a coil is provided while the vortex current generating means does not exist and is provided with an interval maintaining portion that defines the distance between the vortex current generating means and the coil. The 1Q value (referred to as 1Q value) decreases as the temperature rises based on the temperature change of the resistance value of the conducting wire, and when the eddy current generating means exists, the Q value (th) representing the sharpness of the peak of resonance by the eddy current generating means. (2Q value) is a Q value (adjustment) that increases with temperature rise due to current fluctuations corresponding to the temperature change of the resistance value of the eddy current generating means, and represents the sharpness of the peak of resonance based on the coil and the eddy current generating means. The rate of increase / decrease in the temperature rise of (Q value) is provided so as to be smaller than the rate of increase / decrease in the temperature rise of the 1st Q value and the rate of increase / decrease in the temperature rise of the 2nd Q value, and the series resonance circuit including the coil is provided. An antenna characterized in that the diameter of the conducting wire constituting the coil is reduced so as to have at least a part of the resistance value of the resistance element, as compared with the case where the resistance elements are connected in series. device Ru is provided.

Further, one aspect of the method for manufacturing the antenna device of the present invention is a core insertion step of inserting a core formed of a magnetic material into a core insertion portion of a bobbin body having a partition portion in the middle in the longitudinal direction, and a bobbin body. A coil forming step of winding a lead wire around the coil to form a coil, and a winding portion forming step of forming a winding portion by winding a film-like member having a non-magnetic metal layer on the outer peripheral side of the core. The Q value (referred to as the first Q value) representing the sharpness of the peak of resonance by the coil is the temperature based on the temperature change of the resistance value of the conducting wire when the coil is provided while the winding portion does not exist. When the winding portion is provided, the Q value (referred to as the second Q value) representing the sharpness of the peak of resonance due to the winding portion corresponds to the temperature change of the resistance value of the winding portion. The rate of increase / decrease in the temperature rise of the Q value (referred to as the adjusted Q value), which increases with the temperature rise due to current fluctuation and represents the sharpness of the peak of resonance based on the coil and the winding portion, is the rate of increase / decrease in the temperature rise of the first Q value. A method for manufacturing an antenna device is provided, wherein the winding portion is formed so as to be smaller than the rate of increase / decrease in the temperature rise of the second Q value.

According to the present invention, it is possible to suppress fluctuations in the Q value due to temperature changes, even though the antenna device has a simple configuration.

It is a perspective view which shows the whole structure of the antenna device which concerns on 1st Embodiment of this invention. It is a perspective view which shows the state which removed the coil among the antenna device shown in FIG. It is a side sectional view which shows the structure of the antenna device shown in FIG. It is a perspective view which shows the structure of the bobbin body of the antenna device shown in FIG. It is a top view which shows the part where the coil is wound in the bobbin part of the antenna device shown in FIG. It is a top view which expands and shows the winding state of the lower layer lead wire and the upper layer lead wire in the antenna device which concerns on this embodiment. It is an enlarged plan view which shows the winding state of the lower layer lead wire and the upper layer lead wire in the antenna device as a comparative example. It is a figure which shows the relationship between the Q value and the temperature which concerns on each embodiment of this invention. It is a perspective view which shows the structure of the antenna device which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the structure of the bobbin body and the connection terminal of the antenna device shown in FIG. It is a top view which shows the shape of three connection terminals included in the antenna device shown in FIG. It is a side sectional view which shows the antenna device which concerns on 3rd Embodiment of this invention.

(First Embodiment)
Hereinafter, the antenna device 10A according to the first embodiment of the present invention will be described with reference to the drawings.

Further, in the following description, the XYZ Cartesian coordinate system may be used. Among them, the X direction is the longitudinal direction of the antenna device 10A, the X1 side is the side where the connector connecting portion 40A described later is located, and the X2 side is the opposite side. Further, the Z direction is the thickness direction of the antenna device 10A, the Z1 side is the upper side in FIG. 2, and the Z2 side is the lower side in FIG. Further, the Y direction is a direction orthogonal to the XZ direction (width direction), the Y1 side is the right front side in FIG. 1, and the Y2 side is the opposite back left side.

<Overall configuration of antenna device 10A>
FIG. 1 is a perspective view showing the overall configuration of the antenna device 10A. FIG. 2 is a perspective view showing a state in which the coil 50A is removed from the antenna device 10A. FIG. 3 is a side sectional view showing the configuration of the antenna device 10A. As shown in FIGS. 1 to 3, the antenna device 10A mainly includes a core 20A, a bobbin body 30A, a coil 50A, a connection terminal 60A, a copper tape winding portion 70A, and a case 90A. It is said.

As shown in FIGS. 2 and 3, the core 20A is formed of a magnetic material and is provided in a long shape (rod shape) long in the X direction. Further, the core 20A has a rectangular cross section when viewed from the front. The core 20A is made of a magnetic material. As the magnetic material, for example, various ferrites such as nickel-based ferrite or manganese-based ferrite, various magnetic materials such as permalloy and sendust, and various magnetic materials are used. It is possible to use a mixture of materials.

Further, as shown in FIG. 2, a bobbin portion 31A of the bobbin body 30A is attached to the outer peripheral side of the core 20A. The material of the bobbin body 30A is preferably a thermoplastic resin or a thermosetting resin having excellent insulating properties. An example of the material constituting the bobbin body 30A is PBT (polybutylene terephthalate), but other resins may be used as the material. Further, it is more preferable to use a heat-resistant resin for the bobbin body 30A in view of the fact that the bobbin body 30A may be damaged by heat due to soldering or welding.

FIG. 4 is a perspective view showing the configuration of the bobbin body 30A. As shown in FIGS. 1 to 4, the bobbin body 30A is provided with a bobbin portion 31A, a terminal mounting portion 35A, and a connector connecting portion 40A. The bobbin portion 31A is provided with a winding frame portion 32A, a partition portion 33A, and a core insertion portion 34A.

The winding frame portion 32A may have a tubular shape, but in the present embodiment, the winding frame portion 32A is provided in an appropriately punched shape. Specifically, as shown in FIG. 4, the punched portion 32A4 and the slit 32A5 are provided on the top surface 32A2 side (upper side; Z1 side) and the bottom surface 32A3 side (lower side; Z2 side) while leaving the side wall portion 32A1. It is configured to be provided. In particular, the slit 32A5 is provided on the other end side (X2 side) in the longitudinal direction (X direction). Further, the other end side (X2 side) of the slit 32A5 is in an open state. Therefore, when the lead wire 51A is wound around the winding frame portion 32A in a state where a predetermined tension is applied, the core 20A inserted in the core insertion portion 34A is wound and the core 20A is partially held.

Further, the bobbin portion 31A is also provided with a partition portion 33A. The partition portion 33A is a portion for separating the dense winding portion 53A of the coil 50A and the sparse winding portion 54A. In the configuration shown in FIG. 4, the partition portion 33A is, for example, a protruding portion in which the side wall portion 32A1 is projected, but the top surface 32A2 and the bottom surface 32A3 side of the winding frame portion 32A may be projected. ..

Further, the core insertion portion 34A is a hole-shaped portion that penetrates the bobbin portion 31A in the longitudinal direction (X direction), and is a portion into which the core 20A is inserted. A core holding protrusion 32A6 that abuts on the core 20A is provided on the inner wall side of the side wall portion 32A1 facing the core insertion portion 34A. The number of core holding protrusions 32A6 may be any number, but in the configuration shown in FIG. 4, they are provided on one side (X1 side) of the core insertion portion 34A in the longitudinal direction (X direction). The core 20A is held in the core insertion portion 34A by the core holding projection 32A6 and the inner wall of the bobbin portion 31A by winding the lead wire on the other end side (X2 side).

Further, the terminal mounting portion 35A is a portion to which the connection terminal 60A (see FIGS. 1 and 2) is mounted. The terminal mounting portion 35A is provided with an opening 35A1 penetrating in the vertical direction, and the entwined portion 62A of the pair of connection terminals 60A is exposed in the opening 35A1. The terminal of the lead wire 51A of the coil 50A is entwined with each entwined portion 62A, and after the entanglement, the coil 50A and the connection terminal 60A are electrically connected by soldering or the like.

A partition wall 35A2 is provided on the other end side (X2 side) of the terminal mounting portion 35A in order to separate the terminal mounting portion 35A and the core insertion portion 34A. When the core 20A abuts on the partition wall 35A2, the core 20A is positioned in the core insertion portion 34A.

Here, the terminal mounting portion 35A may be configured to mount, for example, a substrate on which a capacitor, a resistor, or the like is mounted. When mounting a board, a part of the connection terminal 60A such as the entwined portion 62A penetrates the board and is soldered at the penetrating part, so that the conductor pattern of the board and the connection terminal 60A are electrically connected. It will be in a state of being connected. When the board is attached to the terminal mounting portion 35A, it is preferable that the board is fitted to the terminal mounting portion 35A.

Further, the terminal mounting portion 35A is continuously provided with the connector connecting portion 40A. In the present embodiment, the connector connecting portion 40A is provided along the width direction (Y direction) orthogonal to the longitudinal direction (X direction). The connector connection portion 40A has a bottomed connector hole (not shown), and one end side (Y1 side) of the connector hole is partitioned by a partition wall portion 41A.

Here, as shown in FIG. 4, the partition wall portion 41A is provided with a terminal hole 42A extending in the width direction (Y direction), and the connection terminal 60A is inserted into the terminal hole 42A. .. Therefore, the connection terminal 60A inserted into the terminal hole 42A can protrude into the connector hole. In this embodiment, since a pair of connection terminals 60A are provided, a pair of terminal holes 42A also exist. However, the number of terminal holes 42A can be appropriately changed according to the number of connection terminals 60A.

Further, an external connector inserted into the connector hole is electrically connected to the connection terminal 60A protruding inside the connector hole. As a result, it is possible to conduct an electric current through the coil 50A and the like, which will be described later.

Next, the coil 50A will be described. FIG. 5 is a plan view showing a portion of the bobbin portion 31A around which the coil 50A is wound. As shown in FIG. 5, the coil 50A is formed by winding the lead wire 51A around the winding frame portion 32A. In the present embodiment, the lead wire 51A has a smaller diameter than the lead wire used in the conventional antenna device. Specifically, assuming that 0.26 mm in diameter is the proper diameter of the lead wire in the conventional antenna device, the lead wire 51A is significantly smaller in size than the proper diameter, and has a diameter of 0.08 mm. There is something to do. When the lead wire 51A having a small diameter is used, at least a part (100% resistance value) of the resistance value of the resistance element is compared with the configuration (conventional configuration) in which the resistance element is connected in series to the series resonance circuit including the core. However, the diameter is reduced so as to have a resistance value smaller than that, but a resistance value larger than that of the lead wire of the coil having a conventional configuration).

The diameter of the lead wire 51A having a small diameter is not limited to 0.08 mm, and may be any value as long as the diameter is smaller than that of the conventional antenna device. For example, when the diameter of the conventional antenna device is sufficiently larger than 0.26 mm, the diameter of the lead wire 51A may be 0.26 mm or less, but may exceed 0.26 mm. The preferred diameter of the lead wire 51A may be, for example, 0.1 mm or less.

Here, the antenna device 10A may have a configuration in which the copper tape winding portion 70A exists, but may also have a configuration in which the copper tape winding portion 70A does not exist. In the case of the configuration in which the copper tape winding portion 70A does not exist, the Q value and the L value are obtained by the following equations (1) and (2).
Q = (1 / R) × (√L / C)… Equation (1)
L = k × μ ₀ × π × a ² × n ² / b ... Equation (2)
Here, k is the Nagaoka constant, μ ₀ is the magnetic permeability, n ² is the square of the radius of the coil, n ² is the square of the number of turns of the coil, and b is the length of the coil.

From the above equations (1) and (2), in the antenna device 10A, in the configuration where the copper tape winding portion 70A does not exist, by reducing the diameter of the lead wire 51A, the inductance is equal to or higher than that of the conventional antenna device. While securing the value L, the Q value representing the sharpness of the resonance peak can be lowered according to the system in which the antenna device 10A is incorporated. Such an adjustment for lowering the Q value is realized in the conventional configuration by mounting a resistance element as disclosed in Patent Document 1. However, in the present embodiment, the Q value can be lowered without mounting a resistance element.

As shown in FIG. 5, the coil 50A is provided with a dense winding portion 53A and a sparse winding portion 54A. The dense winding portion 53A is a portion of the coil 50A that is wound on one side (X1 side; terminal mounting portion 35A side) of the winding frame portion 32A in the longitudinal direction (X direction). On the other hand, the sparse winding portion 54A is a portion wound from the partition portion 33A to the other side (X2 side) of the winding frame portion 32A in the longitudinal direction (X direction) with the partition portion 33A as a boundary. ..

In the configuration shown in FIG. 5, the dense winding portion 53A and the sparse winding portion 54A have a configuration in which the lead wire 51A is wound in two layers. For example, one end side of the winding frame portion 32A in the longitudinal direction (X direction) ( The winding is started from the X1 side), reaches the other end side (X2 side) of the winding frame portion 32A, and then reaches one end side (X1 side) while winding again. Therefore, the lower layer (first layer) lead wire 51A and the upper layer (second layer) lead wire 51A are in a state of intersecting (crossing). However, the dense winding portion 53A and the sparse winding portion 54A are not limited to winding two layers, and may be wound in any number of layers such as four layers or six layers.

It should be noted that the other end side (X2 side) of the winding frame portion 32A may be configured to have a locking means for shifting and holding the lead wire 51A. By this locking means, the lead wire 51A is locked on the other end side (X2 side) of the winding frame portion 32A, so that the lead wire 51A of the lower layer (first layer) and the lead wire 51A of the upper layer (second layer) are engaged. , A state of good crossing (crossing) may be realized. Further, the lower layer (first layer) lead wire 51A and the upper layer (second layer) lead wire 51A are 3 degrees to the width direction (Y direction) orthogonal to the longitudinal direction (X direction) of the bobbin body 30A. It can be configured to intersect at an angle within the range of 177 degrees. Within this angle range, the lead wire 51A of the upper layer (second layer) does not remain in the recess between the lead wires 51A of the adjacent lower layer (first layer), and the inductance value is adjusted. It becomes easy to perform.

As is clear from FIG. 5, the sparse winding portion 54A has a lower winding density than the dense winding portion 53A. That is, the number of turns of the lead wire 51A per unit length in the sparse winding portion 54A is smaller than that in the dense winding portion 53A. Therefore, in the sparse winding portion 54A, a relatively large gap S1 exists between the adjacent lead wires 51A and the lead wires 51A.

Here, in the sparse winding portion 54A, the upper layer conducting wire 51A exists in a state of having a gap S1 outside the already existing lower layer conducting wire 51A. Therefore, in the sparse winding portion 54A, it is possible to adjust the inductance by moving the lead wire 51A so as to narrow the interval of the gap S1.

Further, since the lower layer lead wire 51A and the upper layer lead wire 51A are wound in a state of intersecting (crossing), the upper layer lead wire 51A is in a state of being easily moved with respect to the lower layer lead wire 51A. There is. This situation is shown in FIGS. 6 and 7. FIG. 6 is an enlarged plan view showing the wound state of the lower layer lead wire 51A and the upper layer lead wire 51A in the antenna device 10A according to the present embodiment. FIG. 7 is an enlarged plan view showing the wound state of the lower layer lead wire and the upper layer lead wire in the antenna device as a comparative example.

As shown in FIG. 6, when the lower layer lead wire 51A and the upper layer lead wire 51A intersect (cross), the upper layer lead wire 51A is less likely to fall into the recess between the adjacent lower layer lead wires 51A. It slides while being placed on the lower lead wire 51A. At this time, the upper-layer lead wire 51A slides in a state where the contact area is smaller than that of the lower-layer lead wire 51A.

On the other hand, as shown in FIG. 7, when the lower layer lead wire 51A and the upper layer lead wire 51A are wound in the same direction without intersecting, the upper layer lead wire 51A is between adjacent lower layer lead wires 51A. It tends to be depressed in the dent. Further, the adjacent upper layer lead wire 51A is also in a state of being depressed into a recess in the same manner. Therefore, when the upper wire 51A is slid with respect to the lower wire 51A, the dent to the top of the lower wire 51A with respect to the target upper wire 51A and the surrounding upper wire 51A including the adjacent portion. It is necessary to lift it, and it is very difficult to slide it.

The coil 50A is not limited to such a configuration. For example, the configuration may be such that only the dense winding portion 53A exists. Further, the coil 50A may be configured so that only the sparse winding portion 54A exists.

Next, the connection terminal 60A will be described. The connection terminal 60A shown in FIGS. 1 to 3 is formed by press-molding a metal terminal into a substantially L-shape. The connection terminal 60A is provided so that the appearance is substantially L-shaped. In order to form this substantially L-shape, the connection terminal 60A is bent so as to form a substantially right angle in the middle portion thereof. The substantially L-shaped connection terminal 60A is provided with an insertion piece portion 61A and an entanglement portion 62A. Of these, the insertion piece portion 61A is a portion of the connection terminal 60A that extends in the width direction (Y direction) and protrudes into the connector hole of the connector connection portion 40A described above. Further, the entwined portion 62A is a portion extending in the vertical direction (Z direction). The entwined portion 62A is a portion where the terminal of the lead wire 51A is entwined.

Next, the copper tape winding portion 70A will be described. The copper tape winding portion 70A corresponds to the eddy current generating means and the winding portion. The copper tape winding portion 70A is a portion formed by winding a copper tape provided with a copper foil layer on the outer peripheral side of the coil 50A. The copper tape corresponds to a film-like member having a metal layer. As shown in FIG. 1, in the antenna device 10A of the present embodiment, the copper tape winding portion 70A covers the outer peripheral side of the coil 50A at a portion near both ends in the longitudinal direction (X direction) of the core 20A. It is attached. When this configuration is adopted, the bandwidth can be widened, although the Q value itself is lower than that in the configuration in which the copper tape winding portion 70A does not exist.

The portion near both ends of the core 20A in the longitudinal direction (X direction) may be a portion including both ends of the core 20A, and may not include both ends of the core 20A but may be in the vicinity thereof.

By the way, near both ends of the core 20A in the longitudinal direction (X direction), the magnetic flux passing through the inside of the core 20A is exposed to the outside. Therefore, when the copper tape winding portion 70A is present near both ends of the core 20A, an eddy current is generated in the copper tape winding portion 70A due to the magnetic flux.

Here, when an eddy current is generated, the temperature rises in the copper tape winding portion 70A. Here, in a conductor made of copper, the resistance increases as the temperature rises. Therefore, when the temperature rises in the copper tape winding portion 70A, it becomes difficult for the current to flow in accordance with the temperature rise. Therefore, the eddy current is reduced, and the eddy current loss is reduced. On the other hand, the Q value is higher when the eddy current loss is smaller than when it is large.

Here, in the antenna device 10A, while the copper tape winding portion 70A is provided, the lead wire 51A has the same configuration as the conventional one (corresponding to the antenna device 12A described later). In this case, the eddy current loss decreases due to the increase in resistance of the copper tape winding portion 70A as the temperature rises, and the Q value increases accordingly. On the other hand, in the antenna device 10A, consider a configuration in which the coil 50A is formed by the conducting wire 51A having a small diameter as described above, but the copper tape winding portion 70A does not exist (corresponding to the antenna device 11A described later). In this case, as the temperature rises, the resistance of the lead wire 51A increases, so that the Q value becomes smaller than that in the equation (1).

Here, in the antenna device 10A, the coil 50A is formed by the conducting wire 51A having a small diameter, and the copper tape winding portions 70A are present near both ends of the core 20A in the longitudinal direction (X direction). The temperature change of the Q value at this time is shown in FIG. FIG. 8 is a diagram showing the relationship between the Q value and the temperature. In FIG. 8, the change in the Q value (corresponding to the adjusted Q value) in the antenna device 10A of the present embodiment is shown by a solid line. Further, the change in the Q value (corresponding to the first Q value) in the antenna device 11A in which the coil 50A is formed by the lead wire 51A having a small diameter but the copper tape winding portion 70A does not exist is shown by the alternate long and short dash line. Further, while the copper tape winding portion 70A is provided, the lead wire 51A shows the change in the Q value (corresponding to the second Q value) in the antenna device 12A equivalent to the conventional one by a chain double-dashed line.

As shown in FIG. 8, in the antenna device 10A of the present embodiment, the Q value changes in a state where the Q values indicating the temperature change such as the antenna device 11A and the antenna device 12A are added up. Therefore, in the antenna device 10A, the Q value is unlikely to fluctuate even if the temperature rises, or the Q value fluctuates smaller than the Q value fluctuations in the antenna device 11A and the antenna device 12A. be able to.

The Q value shown by the solid line in FIG. 8 can be adjusted by the position where the copper tape winding portion 70A is attached and the area of the copper tape winding portion 70A, and the diameter of the lead wire 51A should be selected. It can also be adjusted by.

Further, in the state shown in FIG. 8, the fluctuation range is within ± 3% in the practical temperature range of −40 ° C. to + 85 ° C. based on the Q value at 20 ° C. However, the fluctuation range in the above-mentioned temperature range may be within ± 10%.

The case 90A is a portion that covers the entire antenna device 10A, and is provided in a tubular shape that covers the coil 50A and the bobbin body 30A described above. The case 90A may have a mounting portion for mounting on an external device.

<Manufacturing method of antenna device 10A>
When the antenna device 10A having the above configuration is manufactured, the bobbin body 30A is formed by injection molding, and the core 20A is formed by press molding. Further, after the bobbin body 30A is formed, the connection terminal 60A is positioned at the terminal mounting portion 35A and inserted so as to protrude into the connector hole of the connector connecting portion 40A (corresponding to the core insertion step).

Before and after this attachment, the core 20A is attached to the core insertion portion 34A. After the attachment, the lead wire 51A is wound around the winding frame portion 32A to form the coil 50A (corresponding to the coil forming step). In this coil forming step, when the lower layer conducting wire 51A is wound, the adjacent conducting wires 51A are wound up to the partition portion 33A in close contact with each other. As a result, the dense winding portion 53A on the lower layer side is formed.

In a state of being continuous with the dense winding portion 53A on the lower layer side, the lead wire 51A is wound on the other side (X2 side) of the winding frame portion 32A in the longitudinal direction (X direction) from the partition portion 33A, and the lower layer side. The sparse winding portion 54A is formed. When the sparse winding portion 54A on the lower layer side is formed, the winding is performed in a state where a relatively large gap S1 exists between the lead wire 51A and the lead wire 51A.

Then, after reaching the end of the winding frame portion 32A on the other side (X2 side) in the longitudinal direction (X direction), the partition portion 33A is in a winding direction opposite to that of the lower-layer lead wire 51A. Wind the lead wire 51A toward. Therefore, the upper-layer lead wire 51A is wound so as to intersect (cross) the lower-layer lead wire 51A.

Before and after the formation of the coil 50A as described above, one terminal of the lead wire 51A is entwined with the tip end side of the entwined portion 62A of the one connection terminal 60A1. Further, the other terminal of the lead wire 51A is entwined with the entwined portion 62A of the other connection terminal 60A2 after the coil 50A is formed. After the entanglement, the above-mentioned entangled portion is fixed by, for example, soldering by a dip method.

Here, it may be necessary to adjust the inductance value L after manufacturing the antenna device 10A. This inductance value L is obtained by the above equation (2), but when adjusting the inductance value L, the lead wire 51A is moved in the sparse winding portion 54A in the direction of shortening the coil length b. That is, in the sparse winding portion 54A, the lead wire 51A is slid in the direction in which the gap S1 of the predetermined portion is narrowed. As a result, the inductance value L can be adjusted to be slightly larger.

Further, before and after the adjustment of the inductance value L, the copper tape winding portion 70A is formed by winding the copper tape on the outer peripheral side of the coil 50A (corresponding to the winding portion forming step). The copper tape winding portion 70A is formed so as to cover the outer peripheral side of the coil 50A in the vicinity of both ends in the longitudinal direction (X direction) of the core 20A. However, the position where the copper tape winding portion 70A is formed may be appropriately changed. As described above, the antenna device 10A is formed.

Further, after each of the above steps is completed, the bobbin body 30A and the coil 50A are inserted into the case 90A. At this time, the case 90A may be adhered by applying an adhesive to the contact portion between the bobbin body 30A and the coil 50A.

<About the effect>
According to the antenna device 10A having the above configuration, when the copper tape winding portion 70A does not exist but the coil is provided (corresponding to the antenna device 11A), the Q value representing the sharpness of the resonance peak due to the coil 50A. (1st Q value) decreases with increasing temperature based on the temperature change of the resistance value of the lead wire 51A. Further, when the copper tape winding portion 70A is provided, the Q value (second Q value) indicating the sharpness of the resonance peak due to the copper tape winding portion 70A is the temperature change of the resistance value of the copper tape winding portion 70A. It increases with temperature rise due to the current fluctuation corresponding to. Further, the rate of increase / decrease in the temperature rise of the Q value (adjusted Q value) representing the sharpness of the peak of resonance based on the coil 50A and the copper tape winding portion 70A is the rate of increase / decrease in the temperature rise of the first Q value and the second Q value. It is provided so as to be smaller than the rate of increase / decrease when the temperature rises.

Therefore, although the antenna device 10A has a simple structure, it is possible to suppress fluctuations in the Q value (adjusted Q value) due to temperature changes. In particular, in an environment where temperature changes are likely to occur, such as for in-vehicle use, fluctuations in the Q value can be suppressed, so that the performance of the antenna device 10A can be stabilized.

Further, in the present embodiment, the eddy current generating means is a copper tape winding portion 70A formed by winding a copper tape provided with a copper foil layer corresponding to the sheet-shaped member. Therefore, it is possible to satisfactorily suppress the temperature rise of the Q value (adjusted Q value) by utilizing the physical characteristics of copper that the resistance increases as the temperature rises.

Further, in the present embodiment, the copper tape winding portion 70A is located at a portion near both ends of the core 20A in the longitudinal direction (X direction). Therefore, since the copper tape winding portion 70A exists in the vicinity where the magnetic flux passing through the inside of the core 20A goes out, an eddy current can be satisfactorily generated in the copper tape winding portion 70A. Then, the internal resistance is increased by the temperature rise in the copper tape winding portion 70A, so that the eddy current becomes difficult to flow. Therefore, while the copper tape winding portion 70A is provided as shown by the alternate long and short dash line in FIG. 8, the Q value of the lead wire 51A becomes better as the temperature rises, like the Q value in the antenna device 12A equivalent to the conventional one. Can be lowered. As a result, although the antenna device 10A has a simple structure, it is possible to satisfactorily suppress fluctuations in the Q value (adjusted Q value) due to temperature changes.

Further, in the antenna device 10A of the present embodiment, as compared with the configuration in which the resistance element is connected in series to the series resonance circuit including the core (conventional configuration), the lead wire 51A constituting the coil 50A has the resistance of the resistance element. The diameter has been reduced to have at least a portion of the value. Therefore, in the antenna device 10A of the present embodiment, the coil 50A and the copper tape winding portion 70A suppress the fluctuation of the Q value so that the Q value (adjusted Q value) shown by the solid line in FIG. 8 is obtained. It becomes possible.

Further, in the present embodiment, the diameter of the lead wire 51A can be provided to 0.1 mm or less. As described above, in the antenna device 10A of the present embodiment, the diameter of the lead wire 51A is reduced to 0.1 mm without mounting a resistance element (for example, the conventional configuration is 0.26 mm). Since the internal resistance is increased, the Q value (first Q value) can be satisfactorily lowered, and the wide band of the antenna device 10A can be achieved. Further, since the resistance value of the resistance element is inherent in the lead wire 51A, it is not necessary to mount the resistance element, the process can be simplified by that amount, and the inventory management of the resistance element does not need to be performed. ..

(Second Embodiment)
Hereinafter, the antenna device 10B according to the second embodiment of the present invention will be described with reference to the drawings. In the present embodiment, although the description of the configuration common to the antenna device 10A in the first embodiment described above is omitted, the alphabet related to the first embodiment is added to the end of the reference numeral. The alphabet "B" shall be added instead of "A". The alphabet "B" has a configuration related to the second embodiment. Therefore, although not described or illustrated in the second embodiment, the same configuration as the antenna device 10A in the first embodiment may be described with the alphabet "B".

FIG. 9 is a perspective view showing the configuration of the antenna device 10B according to the second embodiment. FIG. 10 is a perspective view showing the configuration of the bobbin body 30B and the connection terminal 60B of the antenna device 10B shown in FIG. The terminal mounting portion 35B of the antenna device 10B of the present embodiment has a configuration different from that of the vicinity of the terminal mounting portion 35A of the antenna device 10A of the first embodiment described above. Further, the connector connecting portion 40B of the antenna device 10B of the present embodiment has a different configuration from the connector connecting portion 40A of the antenna device 10A of the first embodiment described above.

Specifically, the terminal mounting portion 35B is provided with a total of three connection terminals 60B, not a pair. Specifically, the connection terminals 60B1, 60B2, 60B3 exist. FIG. 11 is a plan view showing the shapes of the three connection terminals 60B1, 60B2, and 60B3. As shown in FIG. 11, of the three connection terminals 60B, the connection terminal 60B1 is a connection terminal 60B1 located on the front side (Y1 side) in the width direction (Y direction). Further, the connection terminal 60B2 is located on the back side (Y2 side) in the width direction (Y direction) with respect to the connection terminal 60B1. Further, the connection terminal 60B3 is located on the other side (X2 side) of the connection terminal 60B1 and the connection terminal 60B2 in the longitudinal direction (X direction).

Here, the connection terminal 60B1 is provided with an insertion piece portion 61B, an entanglement portion 62B, and a vertically extending portion 63B. The insertion piece portion 61B is a portion extending in the longitudinal direction (X direction), and is the same portion as the above-mentioned insertion piece portion 61A. Therefore, one side (X1 side) of the insertion piece portion 61B protrudes into the connector hole of the connector connection portion 40B, and can be electrically connected to an external connector inserted into the connector hole.

Further, the entwined portion 62B is a portion in which one terminal of the lead wire 51B is entwined, similarly to the entangled portion 62A described above. Further, the vertically stretched portion 63B is a portion that is stretched in the vertical direction (Z direction). Therefore, the positions of the insertion piece portion 61B and the entanglement portion 62B are different in the height direction (Z direction).

Further, the connection terminal 60B2 is provided with an insertion piece portion 61B and a chip support piece portion 64B. The insertion piece portion 61B has the same configuration as the insertion piece portion 61B at the connection terminal 60B1. Further, the chip support piece portion 64B is a portion provided with a larger dimension in the width direction (Y direction) than the insertion piece portion 61B. Although both ends of the chip support piece portion 64B are inserted into the resin portion of the bobbin body 30A, the portion between both ends is exposed to the opening 35B1. One side of the chip-shaped capacitor 100B is attached to the chip support piece portion 64B in a state of being electrically connected.

Further, the connection terminal 60B3 is provided with a entwined portion 62B and a chip support piece portion 64B. The other terminal of the lead wire 51B is entwined with the entwined portion 62B. Further, the other side of the capacitor 100B is attached to the chip support piece portion 64B in a state of being electrically connected.

Further, in the terminal mounting portion 35B, the connection terminal 60B is provided so as not to protrude upward (Z1 side) from the bottom surface 32B3 of the bobbin portion 31B. In order to have such a configuration, the bottom wall 35B3 of the terminal mounting portion 35B is provided to be thicker than the bottom surface 32B3. Then, a part of the connection terminals 60B1 to 60B3 described above is formed in the bottom wall 35B3 by, for example, insert molding, so that it is in a state of being embedded.

Here, in the bobbin body 30A of the antenna device 10A according to the first embodiment, a partition wall 35A2 that separates the terminal mounting portion 35A and the core insertion portion 34A is provided. However, the bobbin body 30B of the present embodiment is not provided with a configuration corresponding to such a partition wall. Further, as shown in FIG. 10, the connection terminal 60B does not protrude upward (Z1 side) from the bottom surface 32B3. Therefore, the core 20B can be moved to the terminal mounting portion 35B side.

The core 20B is inserted into the core by the core holding projection 32B6 and the inner wall of the bobbin portion 31B by winding the lead wire on the other end side (X2 side), similarly to the core 20A in the first embodiment described above. It is in a state of being held in the portion 34B.

Further, unlike the connector connecting portion 40A in the first embodiment, the connector connecting portion 40B is provided along the longitudinal direction (X direction). A collar portion 43B is provided at a portion that separates the terminal mounting portion 35B and the connector connecting portion 40B. In the present embodiment, the flange portion 43B is provided in the shape of a rectangular plate, and a step portion 44B is provided on the outer peripheral edge portion of the flange portion 43B. The opening edge of the case 90A is fitted to the step 44B.

Further, the antenna device 10B of the present embodiment also includes a coil 50B similar to the coil 50A described above. That is, the lead wire 51B forming the coil 50B has a smaller diameter than the lead wire used in the conventional antenna device. Specifically, assuming that 0.26 mm in diameter is the proper diameter of the lead wire in the conventional antenna device, the lead wire 51B is significantly smaller in size than the proper diameter, and has a diameter of 0.08 mm. There is something to do. As a result, in the antenna device 10B, the Q value can be lowered without mounting a resistance element.

Further, the antenna device 10B of the present embodiment also includes a copper tape winding portion 70B similar to the copper tape winding portion 70A. Then, in the antenna device 10B, when the temperature rises, the Q value changes as shown in FIG. As a result, it is possible to suppress fluctuations in the Q value even if a temperature change occurs.

<About the effect>
The antenna device 10B according to the present embodiment can also exert the same effect as the antenna device 10A according to the first embodiment described above.

In addition, in the present embodiment, the bobbin body 30B does not have a configuration corresponding to the partition wall 35A2, and the connection terminal 60B does not protrude upward (Z1 side) from the bottom surface 32B3. Therefore, it is possible to slide the terminal mounting portion 35B inside the core inserting portion 34B. Therefore, in addition to adjusting the inductance value by sliding the lead wire 51B of the first layer (upper layer) in the sparse winding portion 54B, the inductance value can be increased or decreased by sliding the core 20B, or the Q value (adjustment Q value). ) Can be adjusted.

(Third Embodiment)
Hereinafter, the antenna device 10C according to the third embodiment of the present invention will be described with reference to the drawings. In this embodiment, although the description of the configuration common to the antenna device 10A in the first embodiment described above is omitted, the alphabet related to the first embodiment is added to the end of the reference numeral. The alphabet "C" shall be added instead of "A". The alphabet "C" has a configuration related to the third embodiment. Therefore, although not described or illustrated in the third embodiment, the same configuration as the antenna device 10A in the first embodiment may be described with the alphabet "C".

FIG. 12 is a side sectional view showing the antenna device 10C according to the third embodiment of the present invention. The antenna device 10C of the present embodiment also includes a coil 50C similar to the coil 50A described above. That is, the lead wire 51C forming the coil 50C has a smaller diameter than the lead wire used in the conventional antenna device. Specifically, assuming that 0.26 mm in diameter is the proper diameter of the lead wire in the conventional antenna device, the lead wire 51C is significantly smaller in size than the proper diameter, and has a diameter of 0.08 mm. There is something to do. As a result, in the antenna device 10C, the Q value can be lowered without mounting a resistance element.

Further, the antenna device 10C of the present embodiment does not include the copper tape winding portion 70A of the first embodiment described above. However, when the antenna device 10C is attached to a mounting portion 110C such as a metal vehicle body, an eddy current is generated in the metal of the mounting portion 110C, so that the same operation as that of the copper tape winding portion 70A described above occurs. It is possible to exert the effect.

Specifically, as shown in FIG. 12, the case 90C is provided with an interval maintaining portion 91C. The interval maintenance unit 91C is set to a distance such that the distance from the core 20C to the mounting surface 37C of the bobbin body 30C is a desired Q value. Specifically, in an antenna device in which the diameter of the lead wire 51C is the same as that of the conventional one but the interval maintenance portion 91C having the specified size is present, as shown by the alternate long and short dash line in FIG. 8 when a temperature change occurs. Q value fluctuates. On the other hand, in the antenna device in which the coil 50C is formed by the small diameter conducting wire 51C but the interval maintaining portion 91C does not exist, the Q value fluctuates as shown by the alternate long and short dash line in FIG.

On the other hand, in the antenna device 10C of the present embodiment, the Q value changes in a state where the Q value indicating the temperature change indicated by the alternate long and short dash line in FIG. 8 is added up. Therefore, the fluctuation of the Q value can be smaller than that of the conventional configuration.

The dimensions of the interval maintenance unit 91C can be appropriately set so as to be within a predetermined fluctuation range in the above-mentioned practical temperature range, for example. As an example, the dimension of the interval maintenance unit 91C may be set to 13.1 mm.

Here, in the antenna device 10C of the third embodiment, the lead wire 51C may have the same dimensions as the conventional one (that is, an appropriate diameter), but may have a configuration in which only the interval maintenance portion 91C exists. When such a configuration is adopted, the antenna device 10C secures an inductance value L equal to or higher than that of the conventional antenna device, and a Q value indicating the sharpness of the resonance peak is set in the system in which the antenna device 10C is incorporated. It is possible to lower it together. In the conventional configuration, such an adjustment for lowering the Q value is realized by mounting a resistance element as disclosed in Patent Document 1, but in the present embodiment, the resistance element is mounted. It is possible to lower the Q value without doing so.

<About the effect>
The antenna device 10C of the present embodiment includes an interval maintenance portion 91C that defines an interval between a metal vehicle body or the like mounting portion 110C corresponding to an eddy current generating means for generating an eddy current and a core 20C. .. When the coil is provided while the metal mounting portion 110C does not exist, the Q value (first Q value) representing the sharpness of the peak of resonance by the coil 50C is based on the temperature change of the resistance value of the lead wire 51C. It decreases with increasing temperature. Further, when the metal mounting portion 110C is present, the Q value (second Q value) indicating the sharpness of the resonance peak due to the metal mounting portion 110C is the temperature change of the resistance value of the metal mounting portion 110C. It increases with temperature rise due to the current fluctuation corresponding to. Further, the rate of increase / decrease in the temperature rise of the Q value (adjusted Q value) representing the sharpness of the peak of resonance based on the coil 50C and the metal mounting portion 110C is the rate of increase / decrease in the temperature rise of the first Q value and the second Q value. It is provided so as to be smaller than the rate of increase / decrease when the temperature rises.

Therefore, although the antenna device 10C has a simpler configuration, it is possible to suppress fluctuations in the Q value (adjusted Q value) due to temperature changes. In particular, in an environment where temperature changes are likely to occur, such as for in-vehicle use, fluctuations in the Q value can be suppressed, so that the performance of the antenna device 10C can be stabilized.

<Modification example>
Although each embodiment of the present invention has been described above, the present invention can be variously modified in addition to the above. This will be described below.

In the first and second embodiments described above, the copper tape winding portion 70A around which the copper tape is wound is described as the eddy current generating means and the winding portion. However, the eddy current generating means and the winding portion are not limited to the copper tape winding portion 70A, and various ones can be applied as long as they are wound with a film-like member having a non-magnetic metal layer. .. For example, various materials such as a film-shaped steel plate and aluminum foil can be used.

Further, in the third embodiment described above, the interval maintenance unit 91C is provided integrally with the case 90C. However, the interval maintenance unit 91C may have a configuration separate from that of the case 90C. For example, the bobbin body and the case may have a common configuration in each antenna device, and a fitting body having a fitting structure for fitting the bobbin body and the case may be sandwiched between the bobbin bodies and the case. In this configuration, the distance between the core 20C (coil 50C) and the metal mounting portion 110C can be adjusted simply by changing the fitting.

Further, in each of the above-described embodiments, the copper tape is described as the film-like member. However, the film-like member is not limited to such a narrow tape-like member, but also includes a wide sheet-like member.

Further, in the third embodiment described above, in addition to the interval maintenance portion 91C, a configuration including an eddy current generating means and a winding portion such as a copper tape winding portion may be adopted.

Further, in the above-described embodiment, the electronic component is not attached between the pair of connection terminals 60A, but it may be attached. Further, in the second embodiment described above, the case where the capacitor 100B is attached as an electronic component is described, but another electronic component such as a resistor may be attached. The electronic component may be either a surface mount type or a pin type.

Further, in each of the above-described embodiments, the sparse winding portions 54A and 54B are located on the other side (X2 side) in the longitudinal direction (X direction), and the dense winding portions 53A and 53B are in the longitudinal direction (X direction). The case where it is located on one side (X1 side) is described. However, the configuration is not limited to this, and the sparse winding portions 54A and 54B are located on one side (X1 side) in the longitudinal direction (X direction), and the dense winding portions 53A and 53B are located in the longitudinal direction (X direction). It may be configured to be located on the other side (X2 side) of the above.

Further, a configuration may be adopted in which a plurality of sparse winding portions 54A and 54B are provided and the dense winding portions 53A and 53B are located between the sparse winding portions 54A and 54B. Further, a configuration may be adopted in which a plurality of dense winding portions 53A and 53B are provided and the sparse winding portions 54A and 54B are located between the dense winding portions 53A and 53B.

Further, in each of the above-described embodiments, the case where only one core 20A and 20B is present is described. However, there may be a plurality of cores. Further, the bobbin body may have any configuration as long as the dense winding portion and the sparse winding portion can be formed. Further, the number of connection terminals may be any number, and the configuration of the connection terminals may be any configuration.

10A to 10C ... Antenna device, 20A to 20C ... Core, 30A to 30C ... Bobbin body, 31A, 31B ... Bobbin part, 32A, 32B ... Winding frame part, 32A1, 32B1 ... Side wall part, 32A2, 32B2 ... Top surface, 32A3 , 32B3 ... Bottom surface, 32A4, 32B4 ... Punched part, 32A5, 32B5 ... Slit, 32A6, 32B6 ... Core holding protrusion, 33A, 33B ... Partition part, 34A, 34B ... Core insertion part, 35A, 35B ... Terminal mounting part, 35A1 , 35B1 ... opening, 35A2 ... partition, 35B3 ... bottom wall, 37C ... mounting surface, 40A, 40B ... connector connection, 41A ... partition wall, 42A ... terminal hole, 43B ... bobbin, 44B ... step, 50A , 50B ... Coil, 51A, 51B ... Lead wire, 53A, 53B ... Dense winding part, 54A, 54B ... Sparse winding part, 60A, 60A1, 60A2, 60B, 60B1, 60B2, 60B3 ... Connection terminal, 61A, 61B ... Insert piece part, 62A, 62B ... Tangle part, 63B ... Vertical extension part, 64B ... Chip support piece part, 70A, 70B ... Copper tape winding part (corresponding to eddy current generating means and winding part), 90A ~ 90C ... Case, 91C ... Spacing maintenance part, 100B ... Capacitor, 110C ... Metal mounting part 110C, S1 ... Gap

Claims (10)

With a core made of magnetic material
A coil formed by winding a lead wire around the outer peripheral side of the core,
A flat plate-shaped eddy current generating means arranged on the outer peripheral side of the core and the coil,
With
When the coil is provided while the eddy current generating means does not exist, the Q value (referred to as the first Q value) representing the sharpness of the peak of resonance by the coil is based on the temperature change of the resistance value of the lead wire. Decreases as the temperature rises
When the eddy current generating means is provided, the Q value (referred to as the second Q value) representing the sharpness of the peak of resonance by the eddy current generating means corresponds to the temperature change of the resistance value of the eddy current generating means. It increases with temperature rise due to current fluctuation,
The rate of increase / decrease in the temperature rise of the Q value (referred to as the adjusted Q value) representing the sharpness of the peak of resonance based on the coil and the eddy current generating means is the rate of increase / decrease in the temperature rise of the first Q value and the second Q value. It is provided so that it is smaller than the rate of increase / decrease when the temperature rises.
An antenna device (excluding an antenna device having a temperature difference generating means that causes a temperature difference between the antenna main body portion including the core and the coil and the eddy current generating means). With a core made of magnetic material
A coil formed by winding a lead wire around the outer peripheral side of the core,
A flat plate-shaped eddy current generating means arranged on the outer peripheral side of the core and the coil,
With
When the coil is provided while the eddy current generating means does not exist, the Q value (referred to as the first Q value) representing the sharpness of the peak of resonance by the coil is based on the temperature change of the resistance value of the lead wire. Decreases as the temperature rises
When the eddy current generating means is provided, the Q value (referred to as the second Q value) representing the sharpness of the peak of resonance by the eddy current generating means corresponds to the temperature change of the resistance value of the eddy current generating means. It increases with temperature rise due to current fluctuation,
The rate of increase / decrease in the temperature rise of the Q value (referred to as the adjusted Q value) representing the sharpness of the peak of resonance based on the coil and the eddy current generating means is the rate of increase / decrease in the temperature rise of the first Q value and the second Q value. It is provided so that it is smaller than the rate of increase / decrease when the temperature rises.
The eddy current generating means is a winding portion formed by winding a film-like member provided with a non-magnetic metal layer.
An antenna device characterized by that. The antenna device according to claim 2.
The sheet-like member is a copper tape provided with a copper foil layer, and the winding portion is a copper tape winding portion formed by winding the copper tape.
An antenna device characterized by that. The antenna device according to claim 2 or 3.
The winding portion is located at a portion near both ends in the longitudinal direction of the core.
An antenna device characterized by that. With a core made of magnetic material
A coil formed by winding a lead wire around the outer peripheral side of the core,
A flat plate-shaped eddy current generating means arranged on the outer peripheral side of the core and the coil,
With
When the coil is provided while the eddy current generating means does not exist, the Q value (referred to as the first Q value) representing the sharpness of the peak of resonance by the coil is based on the temperature change of the resistance value of the lead wire. Decreases as the temperature rises
When the eddy current generating means is provided, the Q value (referred to as the second Q value) representing the sharpness of the peak of resonance by the eddy current generating means corresponds to the temperature change of the resistance value of the eddy current generating means. It increases with temperature rise due to current fluctuation,
The rate of increase / decrease in the temperature rise of the Q value (referred to as the adjusted Q value) representing the sharpness of the peak of resonance based on the coil and the eddy current generating means is the rate of increase / decrease in the temperature rise of the first Q value and the second Q value. It is provided so that it is smaller than the rate of increase / decrease when the temperature rises.
Compared with the case where the resistance element is connected in series to the series resonance circuit including the coil, the diameter of the lead wire constituting the coil is reduced so as to have at least a part of the resistance value of the resistance element. Has been
An antenna device characterized by that. With a core made of magnetic material
A coil formed by winding a lead wire having a diameter of 0.1 mm or less on the outer peripheral side of the core, and
A flat plate-shaped eddy current generating means arranged on the outer peripheral side of the core and the coil,
With
When the coil is provided while the eddy current generating means does not exist, the Q value (referred to as the first Q value) representing the sharpness of the peak of resonance by the coil is based on the temperature change of the resistance value of the lead wire. Decreases as the temperature rises
When the eddy current generating means is provided, the Q value (referred to as the second Q value) representing the sharpness of the peak of resonance by the eddy current generating means corresponds to the temperature change of the resistance value of the eddy current generating means. It increases with temperature rise due to current fluctuation,
The rate of increase / decrease in the temperature rise of the Q value (referred to as the adjusted Q value) representing the sharpness of the peak of resonance based on the coil and the eddy current generating means is the rate of increase / decrease in the temperature rise of the first Q value and the second Q value. It is provided so that it is smaller than the rate of increase / decrease when the temperature rises.
An antenna device characterized by that. With a core made of magnetic material
A coil formed by winding a lead wire around the outer peripheral side of the core,
An interval maintenance unit that defines an interval between the core and the eddy current generating means arranged on the outer peripheral side of the coil, and
With
When the coil is provided while the eddy current generating means does not exist, the Q value (referred to as the first Q value) representing the sharpness of the peak of resonance by the coil is based on the temperature change of the resistance value of the lead wire. Decreases as the temperature rises
When the eddy current generating means exists, the Q value (referred to as the second Q value) representing the sharpness of the peak of resonance by the eddy current generating means corresponds to the temperature change of the resistance value of the eddy current generating means. It increases with temperature rise due to current fluctuation,
The rate of increase / decrease in the temperature rise of the Q value (referred to as the adjusted Q value) representing the sharpness of the peak of resonance based on the coil and the eddy current generating means is the rate of increase / decrease in the temperature rise of the first Q value and the second Q value. It is provided so that it is smaller than the rate of increase / decrease when the temperature rises.
An antenna device (excluding an antenna device having a temperature difference generating means that causes a temperature difference between the antenna main body portion including the core and the coil and the eddy current generating means). With a core made of magnetic material
A coil formed by winding a lead wire around the outer peripheral side of the core,
An interval maintenance unit that defines an interval between the core and the eddy current generating means arranged on the outer peripheral side of the coil, and
With
When the coil is provided while the eddy current generating means does not exist, the Q value (referred to as the first Q value) representing the sharpness of the peak of resonance by the coil is based on the temperature change of the resistance value of the lead wire. Decreases as the temperature rises
When the eddy current generating means exists, the Q value (referred to as the second Q value) representing the sharpness of the peak of resonance by the eddy current generating means corresponds to the temperature change of the resistance value of the eddy current generating means. It increases with temperature rise due to current fluctuation,
The rate of increase / decrease in the temperature rise of the Q value (referred to as the adjusted Q value) representing the sharpness of the peak of resonance based on the coil and the eddy current generating means is the rate of increase / decrease in the temperature rise of the first Q value and the second Q value. It is provided so that it is smaller than the rate of increase / decrease when the temperature rises.
The eddy current generating means is a winding portion formed by winding a film-like member provided with a non-magnetic metal layer.
An antenna device characterized by that. With a core made of magnetic material
A coil formed by winding a lead wire around the outer peripheral side of the core,
An interval maintenance unit that defines an interval between the core and the eddy current generating means arranged on the outer peripheral side of the coil, and
With
When the coil is provided while the eddy current generating means does not exist, the Q value (referred to as the first Q value) representing the sharpness of the peak of resonance by the coil is based on the temperature change of the resistance value of the lead wire. Decreases as the temperature rises
When the eddy current generating means exists, the Q value (referred to as the second Q value) representing the sharpness of the peak of resonance by the eddy current generating means corresponds to the temperature change of the resistance value of the eddy current generating means. It increases with temperature rise due to current fluctuation,
The rate of increase / decrease in the temperature rise of the Q value (referred to as the adjusted Q value) representing the sharpness of the peak of resonance based on the coil and the eddy current generating means is the rate of increase / decrease in the temperature rise of the first Q value and the second Q value. It is provided so that it is smaller than the rate of increase / decrease when the temperature rises.
Compared with the case where the resistance element is connected in series to the series resonance circuit including the coil, the diameter of the lead wire constituting the coil is reduced so as to have at least a part of the resistance value of the resistance element. Has been
An antenna device characterized by that. A core insertion step of inserting a core formed of a magnetic material into a core insertion portion of a bobbin body having a partition portion in the middle of the longitudinal direction.
A coil forming step of winding a lead wire around the bobbin body to form a coil,
A winding portion forming step of forming a winding portion by winding a film-like member having a non-magnetic metal layer on the outer peripheral side of the core.
Have,
When the coil is provided while the winding portion does not exist, the Q value (referred to as the first Q value) representing the sharpness of the peak of resonance by the coil is based on the temperature change of the resistance value of the lead wire. Decreases as the temperature rises
When the winding portion is provided, the Q value (referred to as the second Q value) representing the sharpness of the resonance peak due to the winding portion is determined by the current fluctuation corresponding to the temperature change of the resistance value of the winding portion. Increases as the temperature rises
The rate of increase / decrease in the temperature rise of the Q value (referred to as the adjusted Q value) representing the sharpness of the peak of resonance based on the coil and the winding portion is the rate of increase / decrease in the temperature rise of the first Q value and the temperature of the second Q value. The winding portion is formed so as to be smaller than the rate of increase / decrease in the rise.
A method of manufacturing an antenna device.

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