JP2002033614A - Bobbin and biaxial loop antenna provided with the bobbin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biaxial loop antenna provided with a bobbin, on which a coil can easily be wound, that can be downsized without interference for coil winding. SOLUTION: The biaxial loop antenna 10 consists of a 1st antenna ANT 1 where a series resonance circuit is formed with a 1st resonance capacitor C1 connected in series with a coil 14 wound on a bobbin 11 with a ferrite 12 placed therein and of a 2nd antenna ANT 2 where a parallel resonance circuit is formed with a 2nd resonance capacitor C2 connected in parallel with the series connection of a link coil 13a wound coaxially with the 1st coil 14 and a 2nd coil 13 to produce two different magnetic field components. The bobbin 11 is structured such that the bobbin 11 has a terminal 6 at one side and a sidewall 11s on the other side on which the 2nd coil 13 is wound has a thin rib 11r thinner than the sidewall 11s on both sides.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a bobbin and a two-axis loop antenna provided with the bobbin.
For example, the present invention relates to a two-axis loop antenna in which a coil winding is applied to a bobbin including ferrite.

[0002]

2. Description of the Related Art Conventionally, the configuration of an antenna in which two different magnetic field components are generated is disclosed in, for example, Japanese Patent Application Laid-Open No. H11-311.
No. 40734. The antenna (loop antenna) disclosed in this publication includes a first antenna forming a series resonance circuit by a resonance capacitor C1 connected in series with a coil wound around ferrite, a coil wound outside the first antenna, A link antenna wound around a ferrite is connected in series and a resonance capacitor C2 is connected in parallel to form a parallel resonance circuit. A second antenna is provided, and power is supplied to the first antenna in series. It functions as an antenna to be generated.

[0003] In general, a coil winding method in which a coil is wound on a bobbin constituting an antenna or the like is disclosed in, for example, Japanese Patent Application Laid-Open No. 5-105329. In the method disclosed in this publication, the bobbin is provided with a hole in the center where the coil winding is provided, and the rotating member is passed through the hole provided in the center of the bobbin, and then the bobbin is fixed by the stopper. After the bobbin is fixed to the rotating member, the rotating member is rotated to wind a coil around the bobbin.

Further, in a method of fixing both ends of a coil after attaching a coil wound around a bobbin to a terminal, generally, the coil is directly tied to each metallic terminal provided on the bobbin. A method is adopted, and such a method is disclosed in, for example, Japanese Patent Application Laid-Open No. 5-251254.

[0005]

However, when it is necessary to dispose the coil in a very limited space, that is, when the size of the bobbin on which the coil winding is to be formed is reduced, ferrite and bobbin are not provided. , For the coil,
If it has an oscillator and capacitance, it will function as an antenna,
Japanese Unexamined Patent Publication No. Hei 11-340734 does not show a specific configuration for reducing the size of the connection form, and depending on the configuration, the outer shape of the entire antenna becomes large or the antenna performance is affected. Will be exerted.

In the case where a coil winding is applied to a bobbin, a hole is provided in the center of the bobbin as shown in Japanese Patent Application Laid-Open No. 5-105329, the rotary member is passed therethrough and fixed by a stopper, and then the rotary member is removed. In the method of winding the coil around the bobbin by rotating the bobbin, the bobbin itself has a hole through which the rotating member passes in the center, so that the bobbin becomes large and the antenna becomes large.

On the other hand, when a coil is wound on a two-axis antenna, the two axes are orthogonal to the bobbin.
Direction coil winding is required. For this reason, for example, the bobbin is gripped from both sides by a gripping member (for example, a chuck), and the bobbin is rotated to perform winding in one direction. The workability is not good with the method of winding the coil winding. In this method, a portion to be gripped by the chuck is required, and the position of the chuck is important. If a portion to be gripped is required, the bobbin becomes large, and depending on the position of the chuck, the required location may be reduced. A region where the winding cannot be wound appears.

Further, as shown in Japanese Patent Application Laid-Open No. 5-251254, when a coil is wound around a bobbin, a method of directly tying both ends of the coil to respective metallic terminals provided on the bobbin and fixing the coil is as follows. Normally, in order to secure the coil end portion, a method of performing soldering on the binding portion is used.

Generally, soldering is vulnerable to impact. In this method, since the end portion is fixed at one place, stress is easily applied to the fixing portion, which causes disconnection.

Accordingly, the present invention has been made in view of the above-mentioned problems, and has a structure that can easily perform coil winding, a structure that does not interfere with coil winding, and a structure that can be downsized. It is a technical task to make the antenna structure have no influence on the antenna performance and to make the antenna itself a structure resistant to impact.

[0011]

A first technical means taken to solve the above-mentioned problem is that a bobbin having a terminal on one side and a coil wound on the other side is provided on a side wall of the bobbin. Means that thin ribs which are thinner than the thickness of the side wall are provided on both sides of the outer periphery of the bobbin.

According to this, since the bobbin has the terminal on one side, it is possible to supply power to the coil from one side of the bobbin, and it is not necessary to route the wiring and the size can be reduced. In addition, since thin ribs on both sides of the outer periphery of the bobbin are thinner than the thickness of the side wall around which the coil on the other side is wound, the coil is wound in a state where one side wall of the bobbin is supported by the thin ribs on both sides of the outer periphery of the bobbin. This facilitates the attachment to a rotating member (rotating jig) when performing wire drawing. This eliminates the need for the conventional method of fixing the bobbin with the rotating member by the stopper at the time of attaching the bobbin, thereby improving workability in coil winding. When coil winding is applied, the thin rib enables the bobbin to be supported on both sides when winding the winding, and it is possible to apply winding to the bobbin so that it does not interfere with the rotating member during coil winding Becomes

A second technical measure taken to solve the above-mentioned problem is that a bobbin having ferrite therein is provided by a first resonance capacitor connected in series with a first coil wound on the bobbin. A first antenna forming a series resonance circuit, a second coil wound outside the first antenna, and a link coil wound coaxially with the first coil are connected in series, and a second resonance capacitor is connected in parallel. In a two-axis loop antenna in which two different magnetic field components are generated by providing a second antenna forming a parallel resonance circuit and feeding power in series to the first antenna, the bobbin has a terminal on one side and The other side wall around which the second coil is wound has thin ribs on both sides of the outer periphery of the bobbin, the ribs being thinner than the thickness of the side wall.

According to this, since the bobbin has the terminal on one side, it is possible to supply power to the coil from one side of the bobbin, and it is not necessary to route the wiring, and it is possible to reduce the size of the antenna. . Also, the side wall around which the second coil is wound has thin ribs on both sides of the outer periphery of the bobbin, which are thinner than the thickness of the side wall, so that one side wall of the bobbin is supported by the thin ribs on both sides of the outer periphery of the bobbin. In the case where the coil winding is performed in a state where the coil is wound, it is easy to attach to the rotating member (rotating jig). Therefore, it is not necessary to fix the bobbin with the rotating member with the stopper at the time of attaching the bobbin as in the related art. Is also good. Therefore, workability at the time of coil winding is improved. In addition, when coil winding is applied, the thin rib allows the bobbin to be supported on both sides when winding the winding, and the bobbin of the two-axis loop antenna does not interfere with the rotating member during coil winding. Can be wound.

A third technical measure taken to solve the above-mentioned problem is that a bobbin having ferrite therein is provided with a first resonance coil connected in series with a first coil wound around the bobbin. A first antenna forming a series resonance circuit by a capacitor, a second coil wound outside the first antenna, and a link coil wound coaxially with the first coil are connected in series, and the second resonance capacitor is connected in parallel. In a two-axis loop antenna in which two different magnetic field components are generated by providing a second antenna connected to form a parallel resonance circuit and feeding power in series to the first antenna, the bobbin is provided on one side. First fixing means for fixing an end of one coil and supporting a coil winding, the link coil and the second
A terminal provided with second fixing means for fixing an end of the coil and supporting the coil winding; and tying the coil winding to at least one of the first fixing means and the second fixing means. Section and a supporting section that supports the coil winding in pairs, and if it has a fixing section that fixes the coil winding between them, the coil is supported by the binding section and the supporting section from both sides. Can be fixed, so that the stress applied to the winding of the coil can be reduced as compared with the related art. In this case, if the fixing is performed by the fixing portion between the binding portion and the support portion, the coil can be surely fixed, and the reliability of the antenna is improved. In addition, if the fixing portion is fixed in a state where the tension is slightly applied to the coil in the fixing portion from the binding portion and the support portion, the fixing can be surely performed.
If the fixing at the fixing portion is performed by resistance welding, stronger fixing can be performed with respect to vibration and impact than soldering.

In this case, if a winding direction switching means is provided between the first coil and the link coil or at a predetermined position on the bobbin, a link coil wound coaxially with the first coil and the first coil is provided. Is determined by the winding direction switching means, and the winding is applied at the position of the predetermined interval, so that the performance of the antenna is improved.

Further, the fixing portion serves as a side wall when the second coil is wound around the bobbin. If the fixing portion is fixed on the side opposite to the second coil side, the fixing portion does not interfere with the winding of the second coil. .

Further, if the supporting portion is provided with an L-shaped projection for changing the winding direction, the coil can be changed in an arbitrary direction by the L-shaped projection. Thus, the function of easily changing the winding direction can be provided.

[0019]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a two-axis loop antenna (hereinafter, referred to as an antenna) 10 of the present invention provided as a door handle built-in antenna 1 in a door handle 2 attached to a vehicle door (body) 3. ing. In the present embodiment, the door handle 2 will be described below as a grip type handle, but is not limited to this.

A door handle 2 mounted on a vehicle is normally provided behind a vehicle door 3 which is opened and closed when getting on and off. The door handle 2 is, as shown in FIGS.
The vehicle door 3 can be opened and closed by opening and closing the grip GP with the arm 2b extending continuously from the base 2a to the inside of the vehicle door 3 as an axis. When the vehicle door 3 is to be opened, the concave portion 3a of the vehicle door 3 is used.
, Hold the grip GP of the door handle 2,
By turning the rear (rear) outward of the vehicle (counterclockwise in FIG. 1), the vehicle door 3 can be opened. When closing, the vehicle door 3 may be pushed in a direction opposite to the opening direction.

The door handle 2 has a base portion 2a which is thicker in front and rear, and has a shape that is gradually curved toward the center for the purpose of improving the design surface. The door handle 2 is made of metal (for example, zinc or the like) by die casting in order to have strength.
The outer surface is plated with chrome or the like. The door handle 2 is opened outward (in the direction of being outside during mounting) to the opening 22.
, And an antenna 10 described later is provided therein. The antenna 10 disposed in the door handle has an opening 22.
So that the antenna function is not affected even if the
The entire opening 22 is covered with a resin door handle cover 2c. The door handle cover 2c is formed so that its outer shape matches the curved outer shape of the door handle, and a stepped projection 2p provided on the inner surface of the door handle cover 2c at the front is inserted into a mounting hole of the door handle 2. , And is fixed to the door handle 2 by a fixing member such as a screw at the rear.

An arm 2b provided in front of the door handle 2 is provided with a hole 2ba penetrating from the opening 22 therethrough. The harness 7 passes through the hole 2ba,
A power supply device including a resonance capacitor C1 and an oscillator OC provided between the vehicle door 3 and the door inner panel and a harness 7 via a harness 7 serving as a power supply line to the antenna 10
Externally connected. Therefore, when power is supplied from the outside via the harness 7, the structure provided inside the grip portion of the door handle 2 functions as the antenna 10.

Next, the antenna 10 will be briefly described. FIG. 3 is an explanatory diagram showing the configuration of the antenna 10 employed in the present embodiment in an easily understandable manner. The antenna 10 used here includes a first antenna ANT1 and a second antenna ANT2 around which coils 13, 13a and 14 are wound. The first antenna ANT1 is formed of a thin ferrite 12 having a cylindrical shape or a rectangular parallelepiped shape made of a material such as manganese zinc or nickel zinc to improve antenna efficiency, and a material having good conductivity (for example, copper or the like). A coil (first coil) 14 is wound.

The second antenna ANT2 is provided outside the ferrite 12, and the ferrite 12 is provided on the outer periphery in the longitudinal direction of the ferrite 12 while maintaining a predetermined gap with the ferrite 12.
2, a coil (second coil) 13 made of a material having good conductivity is wound around a bobbin 11 made of a resin such as ABS resin or polycarbonate. . In this case, the second antenna A
A part (one end) of the coil 13 wound on the bobbin 11 of the NT2 extends to the ferrite 12 at a close position, is wound around the ferrite 12 a predetermined number of times, and is a coaxial link coil (coupling coil) with the coil 14 with respect to the ferrite 12. 13a). Therefore, the second antenna ANT
2, only the coil 13 is wound, but the ferrite 12 is wound coaxially with the link coil 13a and the coil 14 (see FIG. 3B). FIG.
(B) shows the first antenna ANT1 and the second antenna AN
It is explanatory drawing which showed how to wind the coils 13 and 14 and the link coil 13a about T2, and does not show the external shape of an actual assembly.

In the configuration shown in FIG. 3B, one end (C) wound on the coil 13 constituting the second antenna ANT2
End) and one end (D end) of a link coil 13a extending from the coil 13 to the ferrite 12 at a resonance capacitance (capacitor).
C2 is connected, and a capacitor C1 and a power supply (oscillator) are connected to both ends (A end and B end) of the coil 14 wound around the ferrite 12.
OCs are connected in series.

That is, a first antenna ANT1 forming a series resonance circuit by a resonance capacitor C1 connected in series with a coil 14 wound around a ferrite 12, and a first antenna A
A coil 13 wound in a shape similar to the ferrite 12 outside the NT1 and a link coil 1 wound around the ferrite 12
3a are connected in series, the resonance capacitor C2 is connected in parallel, and a second antenna ANT2 forming a parallel resonance circuit is provided.
By feeding power in series to the antenna ANT1, the two magnetic fields can be made orthogonal. In this case, an equivalent circuit in which the link coil 13a and the coil 14 are connected in series as shown in FIG. (In this figure, L1, L2
1, L22 indicates the inductance of the coils 14, 13a, 13).

In this equivalent circuit, when a voltage (for example, a high-frequency voltage) is applied by the power supply OC, a magnetic field is formed in the x direction as shown in FIG.
Link coil 1 wound on ferrite 12 from NT1 side
3a is excited, and a current flows through the coil 13. In this case, the direction of the magnetic field generated by the link coil 13a and the coil 14 is Hx (x direction), the direction of the magnetic field generated by the coil 13 is Hz (z direction), and the two magnetic field components Hx and Hz are orthogonal to each other. Become.

At this time, the degree of coupling (reactance L21) between the two coils can be freely set by the number of turns of the link coil 13a, and the coil wound around the ferrite 12 has series resonance at the operating frequency f. , F = 1 /
(2π√ (LC)), the resonance capacitance C
1, C2 can be set.

Specifically, the bobbin 11 is 72 × 14 ×
A ferrite (66 × 8 × 2.5 mm) 12 is disposed within 4.5 mm at a predetermined interval of 1 mm, and a coil 13
26 times (inductance is 64 μH), the link coil 13a is wound 5 times, the coil 14 is wound 21 times (inductance is 30 μH), the capacitor C1 (0.047 μH).
When a frequency of 134 KHz is applied as F) and C2 (0.022 μF), mutually orthogonal magnetic fields Hx and Hz are generated.

With such a configuration, the antenna structure is simplified, a space not caused by the antenna is eliminated, and the size can be reduced. In addition, the magnetic field generated from the two antennas ANT1 and ANT2 is an antenna that is orthogonal to each other with a simple configuration depending on how the coils are wound.

The specific configuration in which the antenna 10 is provided in the door handle by using the antenna 10 thus wound will be described in detail with reference to FIGS.

In this embodiment, the coil 1 of the antenna 10
Power is supplied to the terminals 3, 13 a, and 14 via the terminal 6. Four terminals 6 made of tin-plated copper are used, and the terminals 6 have an elongated shape basically along the longitudinal direction of the door handle 2. One end of two terminals (outer terminals) 6 has a step SP near one end, and one end of the remaining two terminals (inner terminals) is similarly near the end. Has one step SP. On the other hand, the other ends of the terminals 6 are each bent at a right angle, and the coils 13, 13a, and 14 are wound around the bent portions at the time of winding the coils 13, 13a, and 14 to be hooked and supported. Parts 6a and 6b are provided in pairs. Support part 6
a and 6b have a substantially L-shape in order to easily change the direction of the winding. Further, the ends of the coils 13, 13a, 14 are clamped at a predetermined position at the center of the support portions 6a, 6b between substantially jaw-shaped claws, and then the coils are fixed by resistance welding. The fixed portions 6aa, 6ab. 6ba,
6bb. Fixed parts 6aa, 6ab, 6ba,
6bb is shorter in length in the direction in which the coil 14 and the link coil 13a are wound than the support portions 6a, 6b, and the coil 13, 13a, 14 is slightly coiled between the support portions 6a, 6b. 13, 13a, 1
4 is fixed. In this case, the shapes of the support portions 6a and 6b are substantially the same, and the left support portions 6a and 6b shown in FIG.
(6b) has an inverted L-shape at the tip, and has a thin abdomen on the way to which the end of the coil winding is entangled. On the other hand, the right support portion 6a (6b) shown in FIG. 4 has an L-shaped tip so that the direction of the coil can be easily changed at the time of coil winding. It has a notch that can be changed.

The coil winding on the bobbin 11 will be briefly described with reference to FIGS. As shown in FIG. 13, the coil winding for the bobbin 11 is inserted and supported by a rotating member 41 that rotates about the x-axis on the side opposite to the side on which the terminals 6 are provided, and is supported in three directions (x
The coils 13, 13 a, and 14 are wound by sequentially supplying the coils to be wound from the nozzle 42 that can freely move in the directions (y, y, and z directions).

As shown in FIG. 15, the bobbin 11
Side walls 11s that regulate the width direction (vertical direction shown in FIG. 15) of the coil 13 are provided at both ends in the width direction at one end in the longitudinal direction, and one side wall 11s has a thickness in the thickness direction of the side wall 11s. A thinner rib 11r having a thinner trapezoidal shape is provided on the outer periphery of the bobbin.

On the other hand, a rotating member 41 for rotating the bobbin 1
14 (see FIG. 14) has an L-shape having a horizontal surface 44, and the bobbin insertion port 40 has a side wall 11s on one side of the bobbin 11 and a thin rib 11r as shown in FIG. A mounting hole 40 is formed in which the inner wall and the horizontal plane 44 are aligned with each other, and the bobbin 11 is moved in one direction (x direction).
It can be inserted and mounted from. Bobbin 1
When 1 is attached to the attachment hole 40 of the rotating member 41, the inner wall of the side wall 11 s coincides with the horizontal plane 44 of the rotating member 41.

For example, when the bobbin 11 is attached to the rotating member 41 and the coil 14 or the link coil 13a is wound around the bobbin 11 as described above, the nozzle 42 is moved to a predetermined position where the winding is to be performed. The coil winding is performed while the nozzle 42 is sequentially moved in the x direction by a predetermined movement amount while rotating about the x axis.

When the coil 13 is wound, the rotating member 41
While the bobbin 11 is kept horizontal (the horizontal plane of the rotating member 41 is horizontal), the nozzle 42 is moved to the region where the coil 13 is wound, and then moved in the xz direction. To perform coil winding. In this case, bobbin 1
1 is supported on both sides (both sides) in the width direction shown in FIG. 16 in the mounting hole 40 by the thin rib 11r, and furthermore, in the winding region of the coil 13 between the side walls 11s on both sides.
Since the horizontal plane 44 of the rotating member 41 does not interfere, when the coil 13 is wound, the winding area of the coil 13 is
It is not restricted by 1 and becomes narrow. That is, it is not necessary to hold the bobbin 11 again by the chuck as in the related art, and the coil 13 can be uniformly wound around the entire winding area between the side walls 11s on both sides.

When the start and end of the coil winding, or hooking on the terminal 6 and changing the winding direction are changed,
The coil winding can be applied by moving the nozzle 42 three-dimensionally to a required location while rotating the rotating member 1 forward or backward as necessary.

Therefore, the bobbin 11 can be easily rotated by the rotating member 41.
Can be mounted on the bobbin 11, and the winding can be performed on the bobbin 11, so that the workability in performing the coil winding is improved. In this case, when the bobbin 11 is inserted into the rotating member 41 for attachment, the retaining pin 45 is automatically pressed from one direction of the rotating jig 41 against one surface of the bobbin 11 or inserted into the positioning hole of the bobbin 11. If you let it pass,
Accurate positioning is performed, and more reliable attachment to the rotating member 41 can be performed.
13a and 14 can be wound.

Next, the bobbin 11 will be described in detail. In the present embodiment, the bobbin 11 has four terminals 6 each having a step SP arranged in parallel in a mold (not shown), and a resin having good fluidity such as a liquid crystal polymer or PBT is formed by insert molding in a state of being arranged in parallel. The material is poured into a mold, and a rectangular parallelepiped bobbin 11 having terminals 6 inserted on one side is used (one side of the bobbin 11 is shown in FIG. 4). As described above, immediately after bobbin molding, one end (the harness connection side) is an open end having the step SP having an elongated shape, and each is in a state where four are substantially parallel to each other. As shown in FIG. 6, the bobbin 11 having a cubic shape has a concave portion in which a ferrite 12 is disposed on one side in the longitudinal direction in the plate thickness direction, and a rectangular parallelepiped shape is formed in the concave portion formed in the bobbin 11. Of the ferrite 12 is covered with a bobbin cover (the hatched portion of the ferrite 12 shown in FIG. 6 is covered with the bobbin cover). Therefore, ferrite 1
2 is substantially invisible. The first antenna ANT1 that generates a biaxial magnetic field with respect to the bobbin 11 in which the ferrite 12 is provided in the bobbin as described above.
And the coil 1 to form the second antenna ANT2.
A winding is provided by 3, 13a and 14. The winding form wound on the bobbin 11 is the same as that of the winding described above with reference to FIG. 3, and the winding ends (A ends, A ends) shown in FIG.
B end, C end, D end) are the fixing portions 6aa, 6a in FIG.
After being wound to the positions of b, 6ba and 6bb, they are fixed.

Next, with reference to FIGS. 7 to 11, description will be given of coil winding when winding in the order of the coils 14, 13a and 13 employed in the present embodiment, but it is not limited to this. As shown in FIG.
4, the end of the coil 14 is connected to the abdomen 6a1 of the terminal 6.
And hooked on the support portion 6a2 at the tip of the inverted L-shape. Then, it passes through the J-shaped fixing part 6aa. next,
Hooked on the L-shaped support portion 6a3, a notch 6a in the middle
4 and then to the support 6a5,
The coil winding of the first antenna ANT1 starts. In the coil winding of the first antenna ANT1, the coil 14 is wound a predetermined number of times in the x direction. Thereafter, the bobbin 11 is hooked on 11t1, which is one of the protrusions provided at a predetermined position where the distance between the coil 14 and the coil 13a is constant, and the winding direction is changed from the z-axis direction to the x-axis direction. And then bring it back to the terminal 6 side.

On the other hand, the terminal 6 is hooked on the supporting portion 6a6, hooked on the notch 6a7 on the way, hooked on the L-shaped supporting portion 6a8, passed through the J-shaped fixing portion 6ab, and After hooking on the letter-shaped support part 6a9, the abdomen 6a
The coil winding of the coil 14 is completed by tying the end to 10 (see FIG. 12).

Next, when winding the link coil 13a, as shown in FIG.
After entangled with b1, it is hooked on the support portion 6b2 at the tip of the inverted L-shape. Then, it passes through the J-shaped fixing portion 6ba, then hooks on the L-shaped support portion 6b3, and hooks on the cutout portion 6b4 in the middle. Then, after coming to the support portion 6b5, it is hooked on 6b6, and a winding is drawn out in the x-direction. With respect to the side portion of the protrusion 11t2 which keeps the distance between the coils located exactly opposite to the protrusion 11t1 constant. , After making one turn in the x direction, the direction is changed and the link coil 13a is wound a predetermined number of times in the x direction. After that, the hook is hooked on the protrusion 11t3 provided on the same side as the protrusion 11t1, and the direction of the winding direction is changed to terminate the link coil winding.

In the coil winding of the coil 13, as shown in FIG. 9, the coil 13 is wound so as to be outside the coils 14 and 13a, the coil 13 is wound, and then brought to the terminal side.

In this case, when returning the coil 13 to the terminal 6, the coil 13 is hooked at the base of the support portion 6b7, a notch portion 6b8 on the way, and hooked on the support portion 6b9 at the tip of the inverted L-shape. Then, it passes through the J-shaped fixing part 6bb, and then hooks on the inverted L-shaped supporting part 6b10, and the notch part 6b1 on the way.
1 and entangled with the abdomen 6b11 to link coil 13
The coil winding of the coil 13 a and the coil 13 subsequent thereto is ended.

When the coil is wound in this manner, the cross sections of the fixing portions 6ba, 6bb are as shown in FIG. 10, and one width direction (y direction) of the coil 13 is regulated by the side surfaces of the fixing portions 6ba, 6bb. However, in this case, the link coil 1
Fixing portions 6ba, 6bb for fixing 3a and coil 13
Since the J-shaped part is on the opposite side of the coil winding,
When the coil 13 is wound, it does not interfere with the nozzle 42 and is not restricted by the area of the coil winding. Fixed parts 6aa, 6ab,
6bb, 6ba are supported on both sides by a pair of supporting portions 6a, 6b on both sides, and fixed portions 6aa, 6ab, 6bb, 6b.
In a, after the J-shaped portion is caulked in a state where the coils 13, 13a, and 14 are all slightly tensioned (a state in which the coils are slightly V-shaped), the welding members 30, 31 are used for soldering from both sides. Since it is fixed by resistance welding that is strong against vibration and shock, the structure becomes strong against shock and the like. In this case, since the coils 13, 13a, 14 are supported from both sides by both support portions 6a, 6b, stress in the coils is reduced as compared with the case where the coils are supported at one place, and the coils 13, 13a, 1
After the fixing of 4, the disconnection at the fixing portion can be prevented.

The protrusion 11t1 has a concave portion on the side wall on which the coil 13 is wound, and a single wire for returning the coil 14 to the terminal 6 after winding the coil 14 a predetermined number of times around the bobbin 11 in the concave portion. By passing through, the coil 13 wound multiple times
And one coil 14 can be wound side by side. In the protruding portion 11t2, a concave portion is provided on the side opposite to the side on which the coil 13 is wound, and the link coil 13a from the terminal 6 can pass through the concave portion.

As described above, one end (front side) of the bobbin 11 around which the coils 13, 13a, and 14 are wound has the flange 11
f are provided at two places in the same direction, and the resonance capacitor C2 is disposed between the flange 11f and the terminal 6 having one open end. There are two L-shaped terminals 20 bent inward from the resonance capacitor C2, and the terminals 20 of the resonance capacitor C2 are joined to two inner terminals of the four terminals 6 by resistance welding. In this case, since the two inner terminals 6 have the step SP near the ends, the end 6e of the terminal 6 and the end 20 of the terminal 20 of the resonance capacitor C2 at the step SP.
a is joined by resistance welding. Accordingly, by arranging the resonance capacitor C2 as close as possible to the coil 13, the line connected to the resonance capacitor C2 is shortened, and noise is prevented from being placed on the line. Oscillation can be stabilized.

On the other hand, the remaining two outer terminals 6 also have a stepped portion SP, and the outer and inner two terminals 6 of the four terminals 6 are caulked to the harness 7 at the end 6d. The terminal 9 is fixed by resistance welding. An end 6e electrically connected to the resonance capacitor C2 of the terminal 6 and an end 6d connected to the harness 7 are connected to the end 6e of the terminal 6 connected to the resonance capacitor C2 and the harness 7 so as not to short-circuit each other.
Are provided at the ends 6d of the terminals 6 connected to the door handle 2 at different heights in the plate thickness direction.
The ends 6e and 6d of the terminal 6 can be made thinner in the plate thickness direction than the portion where the coils 13, 13a and 14 are wound along the curved outer shape (see FIG. 6).

As described above, the bobbin-integrated terminal 6 in which the coils 13, 13 a, and 14 are wound around the ferrite 12.
Is mounted in a resin case 5 made of a liquid crystal polymer. Case 5 is shown in FIG.
As shown in FIG. 6 and FIG. 6, the rectangular parallelepiped harness has a slender shape in which the harness portion is disposed, and the terminal 6 and the coils 13, 13a, 14 are gradually thinned in the thickness direction and the width direction. The wound bobbin 11 can be completely covered. The case 5 has an opening on the lower side shown in FIG. The bobbin 11 to which the harness 7 is attached is housed in the case 5. In this case, one end of the bobbin 11 is supported by a support portion 5 d extending from a side wall inside the case, and the side of the bobbin 11 on which the terminal 6 is provided ( 6 is in contact with the inner wall of the case 5. Three projections 5 a for fixing the bobbin 11 are provided on the inner wall of the case 5. Each of the protrusions 5a exists between the position where the resonance capacitor C2 is provided and the caulked portion of the harness 7.
Furthermore, when the opening is potted with a urethane-based potting material inside the case, a concave side wall 5b is formed on the harness side so that the potting agent does not flow outside.
Are partitioned and provided. When the bobbin 11 is housed in the case, the two projections 5a provided inside the case are inserted into O-shaped holes of the terminals 9 caulked at the tip of the harness 7, and the projection 5a provided at one center is provided. Are penetrated between the two inner terminals 6, the tips of the three projections 5a are fixed by thermal caulking. Therefore, the bobbin 11 is supported at one end on the coil side by the support portion 5a extending from the case side wall and fixed at the other end by thermal caulking at three places, so that the bobbin 11 can be held in the case. Under these conditions, the coils 13, 13a, 14
Is wound around the bobbin 11, the resonance capacitor C2, and the harness (the region up to the side wall 5b partitioned in the opening of the case 5) by injecting a urethane-based potting agent into the space of the case opening to solidify the potting agent. Fix it. With this potting, the antenna 10 can be waterproofed.
The antenna 10 housed in the case as described above can be made into a sub-assembly.

The sub-assembled antenna 10 has a harness 7 provided with a hole 2 b provided at the front of the door handle 2.
a, the projection 2p of the door handle cover 2c is inserted through a hole 5c provided in the front part of the case 5, and the antenna 10
Is fixed to a predetermined position, the protrusion 2p is thermally caulked by covering the door handle cover 2c from the outer surface of the door handle 2, and the opposite side is fixed by a fixing member such as a screw. Waterproof measures will be taken. Further, the harness 7 extending from the antenna 10 provided in the door handle 2 in this manner is provided with a resonance capacitance C.
1 and the oscillator OC, an antenna 1 with a built-in door handle is obtained.

Accordingly, the resonance capacitance C1 on the vehicle side and the harness 7 reaching the power feeding device are drawn out from the front of the outside handle 2 where the movable amount is relatively small, so that the drawing from the terminal 6 is arranged in front of the vehicle. As a result, the harness 7 can be easily routed.

Since the outside surface of the outside door handle is curved, the grip portion G of the door handle 2 is formed.
Since a space is relatively more easily secured on both sides than at the center of P, a connection point CP between the terminal 6 and the resonance capacitor C2 is provided in front of the case 5, and resonance occurs between the connection point CP and the coil winding. By arranging the capacitor C2, the antenna space in the grip handle can be effectively used.

Further, the ends 6e and 6d of the terminal 6 are separated from each other by a predetermined distance in order to avoid contact with each other, and the side wall 5b is interposed between the four parallel running lines. Short circuits are prevented. End 6d of terminal 6,
Since resistance welding is used for the connection with each of the electrodes 6e, it is strong against impact and reliability can be secured. In addition, when compared to soldering, this resistance welding has a stable size of the welded portion in the thickness direction, and even when the connection with other terminals or the clearance with the harness is relatively small, the resistance welding does not touch each other. Can be avoided.

The above-mentioned antenna 1 with a built-in door handle is provided.
When a passenger (for example, a driver) approaches a vehicle, when the driver approaches his / her hand to the door handle 2 to indicate that he / she wants to ride, or when the driver leaves the vehicle without locking the vehicle door 3 For example, the present invention can be applied to an electronic key system that locks and unlocks a door lock device that automatically locks a vehicle door 3.

[0057]

According to the present invention, since the bobbin has a terminal on one side, power can be supplied to the coil from one side of the bobbin, wiring does not need to be routed, and the antenna can be downsized. The side wall around which the second coil is wound has thin ribs on both sides of the outer periphery of the bobbin, which are thinner than the thickness of the side wall, so that one side wall of the bobbin is supported by the thin ribs on both sides of the outer periphery of the bobbin. When coil winding is performed in the state, attachment to a rotating member (rotating jig) is facilitated. For this reason, it is not necessary to fix the bobbin with the rotating member with the stopper at the time of bobbin attachment as in the conventional case, and the workability at the time of coil winding is improved. Also, when coil winding is applied, the thin rib allows the bobbin to be supported on both sides when winding the winding, and apply the winding to the bobbin so as not to interfere with the rotating member during coil winding Can be.

Further, since the coil can be fixed in a state where the coil is supported from both sides by the binding portion and the support portion, the stress applied to the coil winding can be reduced as compared with the conventional case, and the binding portion and the support portion can be reduced. If the fixing is performed by the fixing portion that fixes the coil winding between the coils, the coil can be surely fixed, and the reliability of the antenna is improved.

In this case, the interval between the first coil and the link coil wound coaxially with the first coil is determined by the winding direction switching means, and the winding is applied to the position of the predetermined interval. Performance is improved.

Further, the fixing portion serves as a side wall when the second coil is wound around the bobbin, and if the fixing is performed on the side opposite to the second coil side, the fixing portion does not interfere with winding the second coil. .

Further, if the support portion is provided with an L-shaped projection for changing the winding direction, the coil can be changed in an arbitrary direction by the L-shaped projection. Thus, a function of easily changing the winding direction can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of mounting when a two-axis loop antenna (antenna) having a bobbin according to an embodiment of the present invention is mounted on a vehicle.

FIG. 2 is a front view of the antenna shown in FIG.

FIG. 3 is an explanatory diagram showing a configuration of an antenna according to an embodiment of the present invention.

FIG. 4 is a diagram showing a connection relationship between a harness connected to the terminal and a coil wound on the bobbin with respect to a terminal provided on the bobbin of the antenna according to the embodiment of the present invention.

FIG. 5 is a front view showing an antenna configuration of the antenna according to the embodiment of the present invention.

FIG. 6 is a side view shown in FIG.

FIG. 7 is an explanatory diagram of a case where the first coil shown in FIG. 3 is wound around a bobbin having ferrite therein.

FIG. 8 is an explanatory diagram of a case where the link coil shown in FIG. 3 is wound around a bobbin having ferrite therein.

FIG. 9 is an explanatory view of a case where the second coil shown in FIG. 3 is wound around a bobbin having ferrite therein.

10 is a sectional view taken along the line AA shown in FIG.

11 is a sectional view taken along the line BB shown in FIG.

FIG. 12 is an enlarged view of a relevant part of a binding portion, a support portion, and a fixing portion shown in FIG. 9;

FIG. 13 is a front view when the bobbin of the antenna according to the embodiment of the present invention is attached to a rotating jig that performs coil winding.

FIG. 14 is a side view when the bobbin of the antenna according to the embodiment of the present invention is attached to a rotating jig that performs coil winding.

FIG. 15 is a perspective view showing a rib shape of the bobbin shown in FIG.

16 is a sectional view taken along the line CC shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Door handle built-in antenna 2 Door handle 6 Terminal 6a, 6b Support part (1st fixing means, 2nd fixing means) 6aa, 6ab, 6ba, 6bb Fixing part (1st fixing means, 2nd fixing means) 6a1, 6a10, 6b1, 6b11 Tie (first fixing means, second fixing means) 6a2, 6a3, 6a4, 6a5, 6a6, 6a7, 6
a8, 6a9, 6b2, 6b3, 6b4, 6b5, 6b
6, 6b7, 6b8, 6b9, 6b10 Supporting part (first
Fixing means, second fixing means) 10 two-axis loop antenna (antenna) 11 bobbin 11f flange 11t1, 11t2, 11t3 projection (winding direction switching means) 11s side wall 11r thin rib 12 ferrite 13, 14 first coil, first coil 2 coil (coil) 13a link coil (coil) 22 opening ANT1 first antenna ANT2 second antenna CP connection C1 first resonance capacitance C2 second resonance capacitance SP step

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01Q 1/32 H01Q 1/32 Z 1/40 1/40 1/44 1/44 21/28 21/28 (72) Inventor Kazuyoshi Mori 2-3-3 Showa-cho, Kariya-shi, Aichi F-term in Ichin Engineering Co., Ltd. 3D020 BA13 BB01 BC06 BD02 5J021 AA02 AA06 AA13 AB04 GA08 HA05 HA10 JA03 5J046 AA07 AA19 AB11 MA03 MA09 QA02 SA02 5J047 AA07 AA19 AB11 EA01 EA06

Claims (6)

[Claims] 1. A bobbin having a terminal on one side and a coil wound on the other side, wherein the side wall of the bobbin has thin ribs on both sides of the outer periphery of the bobbin, the ribs being thinner than the thickness of the side wall. Bobbins. 2. A first antenna for forming a series resonance circuit with a first resonance capacitor connected in series with a first coil wound around the bobbin, the first antenna comprising: A second antenna wound outward and a link coil wound coaxially with the first coil are connected in series, a second resonance capacitor is connected in parallel to form a second antenna forming a parallel resonance circuit, and the first antenna is provided in the first antenna. In a two-axis loop antenna in which two different magnetic field components are generated by feeding power in series, the bobbin has a terminal on one side and a side wall on the other side around which the second coil is wound. 2. A thin rib having a thickness smaller than a thickness is provided on both sides of the outer periphery of the bobbin.
Axial loop antenna. 3. A first antenna forming a series resonance circuit with a first resonance capacitor connected in series with a first coil wound around the bobbin, the first antenna being provided with respect to a bobbin having a ferrite therein. A second antenna wound outward and a link coil wound coaxially with the first coil are connected in series, a second resonance capacitor is connected in parallel to form a second antenna forming a parallel resonance circuit, and the first antenna is provided in the first antenna. In a two-axis loop antenna in which two different magnetic field components are generated by feeding power in series, the bobbin fixes an end of the first coil to one side and supports a coil winding. And a terminal having second fixing means for fixing ends of the link coil and the second coil and supporting a coil winding, and at least one of the first fixing means and the second fixing means. 3. The device according to claim 2, further comprising a pair of a binding portion for binding the coil winding and a support portion for supporting the coil winding, and a fixing portion for fixing the coil winding therebetween. Two-axis loop antenna. 4. The two-axis loop antenna according to claim 3, further comprising a winding direction switching means between the first coil and the link coil or at a predetermined position on the bobbin. 5. The fixing device according to claim 4, wherein the fixing portion serves as a side wall when the second coil is wound around the bobbin, and is fixed on a side opposite to the side of the second coil.
Axial loop antenna. 6. The device according to claim 5, wherein an L-shaped protrusion for changing a winding direction is provided on the support portion.
Axial loop antenna.