JP3280220B2 - Transmitter / receiver antenna coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission / reception antenna coil which is wound around the outer periphery of a bobbin and has a lead wire drawn out from a coil which is electromagnetically coupled to a transponder coil provided on an ignition key.

[0002]

2. Description of the Related Art For example, in an automobile, it has been considered to add a function as an electronic key using an electric identification code to an ignition key in order to improve security performance against theft. . In this case, for the key grip of the ignition key,
It is common to incorporate a transponder,
The transponder has a transponder function of returning a response signal including an identification code stored in advance when a power signal and an interrogation signal are given from the outside.

[0003] That is, the transponder generates operating power by receiving a power signal, and is activated by the operating power to return a response signal in response to an interrogation signal.

In this case, for the electronic key function, the power signal and the interrogation signal are transmitted to the vehicle side in a state where the ignition key configured as described above is inserted into the key hole for starting the engine. An immobilizer function is provided for receiving the response signal from the transponder on the ignition key side and permitting the ignition key to start the engine only when an identification code in the response signal matches a preset identification code. And a transmission and reception ECU.

The ignition key cylinder is provided with a transmitting / receiving antenna coil for receiving a response signal transmitted from the ignition key.

The transmitting / receiving antenna coil is constructed by winding a coil around a bobbin provided so as to surround an ignition key cylinder, and connecting the coil to draw out a lead wire of a harness. In this case, the harness is connected to the coil via the terminal so that the tensile force applied to the harness is not directly applied to the coil.

FIG. 15 shows a connection structure of a lead wire to a coil. In FIG. 15, a terminal 2 is provided upright on the bobbin 1 by insert molding or insertion, and an end of the coil 3 wound around the bobbin 1 is soldered or welded to one end of the terminal 2. , Terminal 4 at the other end of the harness lead wire 4
Are soldered or welded or connector mounted. Therefore, the force applied to the lead wire 4 is
Therefore, it is possible to prevent a large force from being applied to the coil 3.

[0008]

However, in the above-mentioned prior art, since the terminal 2 is integrated with the bobbin 1, there are disadvantages in that the shape of the terminal portion becomes large and the cost is high.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to reduce the size of a transmitting / receiving antenna coil in a configuration in which a lead wire is drawn out of a coil wound around a bobbin, while reducing the size. Is to provide.

[0010]

According to the present invention, there is provided a bobbin provided so as to surround an ignition key cylinder into which an ignition key having a transponder function is set, and the ignition coil wound around the outer periphery of the bobbin. A transponder coil provided on a key and a coil which is electromagnetically coupled to the transmission / reception antenna coil having a lead wire drawn out of the coil, and held in a wound state in which the lead wire is clamped on the outer periphery of the bobbin. A terminal processing unit is provided, and a lead-out base end of the lead wire drawn out of the bobbin from the terminal processing unit to an axis of the bobbin
A stopper portion is provided for holding in a direction along the direction (claim 1).

According to such a configuration, when a large force is applied to the lead wire, the force can be received by the stopper portion and the terminal processing portion, so that a large force is not applied to the coil. In this case, since the stopper portion and the terminal processing portion are provided integrally with the bobbin, the overall size can be reduced.

In addition, according to such a configuration, since the stopper can be provided along the bobbin, the stopper can be provided without protruding outside the bobbin.

Furthermore , the force applied to the lead wire can be reliably received by the terminal processing unit.

[0014]

FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIGS. FIG. 3 schematically shows the configuration of the entire system by combining functional blocks. In FIG. 3, a transponder 13 is built in a key grip 12 of an ignition key 11 of a vehicle in a unitized state. The transponder 13 is mainly configured by a microcomputer, and receives a power signal and an interrogation signal from the outside through the transponder coil 14 and responds to the interrogation signal with a predetermined identification code. A transponder function for returning a signal is set.

On the other hand, an ignition key cylinder 15 into which the ignition key 11 is inserted is provided on the vehicle side. Here, ignition key cylinder 1
The antenna coil 16 is disposed so as to surround the antenna coil 5, and when the ignition key 11 is inserted into the ignition key cylinder 15, the antenna coil 16 and the transponder coil built in the ignition key 11 are provided. 14 are electromagnetically coupled.

Transmission / reception ECU 17 provided on the vehicle side
Is composed mainly of a microcomputer.
The microcomputer has a well-known IG provided corresponding to the ignition key cylinder 15.
On signals from the switch 18 and the key remind switch 19 are input.

The transmission / reception ECU 17 gives an engine start permission to the engine control ECU 20 based on ON signals from the IG switch 18 and the key remind switch 19. Therefore, the engine control ECU 20
IG switch 18 with engine start permission given
When a start signal is input from the engine, the engine is started.

Now, the configuration of the antenna coil 16 will be described below. 1 and 2 show a perspective view of an antenna coil 16 provided in an ignition key cylinder of an external type with a lighting ring, and FIGS. 4 to 7 show a left side surface, a front surface, a right side surface, and a vertical side surface of the antenna coil 16. 8 shows the bobbin in a perspective view.

In this case, the ignition key cylinder 1
Since an illumination ring (not shown) is provided so as to surround the tip of the antenna 5, an antenna coil 16 is provided so as to surround the illumination ring. Therefore, the inner diameter of the antenna coil 16 is designed to be larger than the diameter of the ignition key cylinder 15.

In FIGS. 1 and 2 and FIGS. 4 to 8, a groove-shaped coil mounting portion 22 and a terminal processing portion 23 are formed on the outer periphery of a cylindrical bobbin 21 at different levels. The coil 24 is wound. A slit 26 is formed in a boundary wall portion 25 between the coil mounting portion 22 and the terminal processing portion 23, and the end of the coil 24 projects through the slit 26 into the terminal processing portion 23 in a folded state.

The coil 24 is connected to a harness. That is, the lead wire 28 of the harness 27 is wound around the terminal processing unit 23, and the lead wire 28 is soldered to the coil 24 protruding from the terminal processing unit 23. Here, the inner peripheral wall surface of the terminal processing unit 23 has
As shown in FIG. 2, a rib 29 is integrally formed, and the lead 29 wound around the terminal processing section 23 is pressed by the rib 29.

A stopper 31 is formed on the skirt 30 of the bobbin 21, and the stopper 31 holds an intermediate portion of the lead wire 28. That is, the stopper 31 is formed by forming a pair of protrusions 31 a on the skirt 30. In this case, the protrusion 31a
The groove formed therebetween is formed along the axial direction of the bobbin 21, and the lead wire 28 is inserted into the groove 21. The projection 31a is formed in a shape that presses the lead wire 28 inserted between the projections 31a from above. The skirt portion 30 includes a bobbin 21.
Is provided on the ignition car cylinder 15 side.

In order to assemble the transmission / reception antenna coil 16 having the above-described configuration to the ignition key cylinder 15, the terminal of the harness 27 is connected to a connector (not shown) while the transmission / reception antenna coil 16 is mounted on the outer periphery of the ignition key cylinder 15. Connecting. At this time, the worker may pull the harness 27 strongly. In such a case, a large tensile force acts on the harness 27, and a large tensile force also acts on the lead wire 28 of the harness 27.

However, in this embodiment, the lead wire 2
8 is held by being folded back by the stopper portion 31 and is held in a state of being in close contact with the terminal processing portion 23 of the bobbin 21, so that a large tensile force acts on the lead wire 28. Can also receive the tensile force at the stopper portion 31 and the terminal processing portion 23, and the coil 2
4 can be prevented from being directly applied.

According to the above configuration, the coil mounting section 22 and the terminal processing section 23 are formed on the bobbin 21 of the transmitting / receiving antenna 16, the coil 24 is wound around the coil mounting section 22, and the harness is connected to the terminal processing section 23. 27 lead wires 28
Is wound, and the end of the coil 24 is connected to the end of the lead wire 28. Therefore, even when a large tensile force is applied to the harness 27, the coil 24 is damaged by the tensile force. Can be prevented. Therefore, unlike the conventional example in which the terminal receives the tensile force applied to the harness, the present invention can be carried out without providing a terminal, so that the device can be manufactured inexpensively while reducing the size.

In this case, since the rib 29 is formed on the inner peripheral wall of the terminal processing section 23 and the lead wire 28 of the harness 27 is pressed and held by the rib 29, the tensile force applied to the harness 27 is reduced. We can receive enough.
In addition, since the direction of the groove of the stopper portion 31 is set to be in the axial direction of the bobbin 21, the height dimension of the stopper portion 31 protruding from the bobbin 21 can be suppressed, thereby further contributing to downsizing as a whole. Can be.

FIGS. 9 to 14 show a second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. The second embodiment shows an ignition cylinder built-in type, and is characterized in that it is smaller than that of the first embodiment.

That is, in the antenna coil 33, the bobbin 21 has the coil mounting section 22 and the terminal processing section 23 formed in parallel, and the coil 24 is wound around the coil mounting section 22. The lead wire 28 of the harness 27 is wound around the coil 24, and the end of the lead wire 28 is soldered to the end of the coil 24. Here, the stopper portion 31 for holding the lead wire 28 is formed such that the groove between the protrusions 31 is directed in the radial direction of the bobbin 21. Therefore, the harness 27 mounted on the bobbin 21 is mounted so as to face outward.

According to the second embodiment, similarly to the first embodiment, the tensile force applied to the harness 27 is
8 can be received by the stopper unit 31 and the terminal processing unit 23 that hold the terminal 8. In this case, since the groove of the stopper portion 31 is directed in the radial direction of the bobbin 21, that is, outward of the ignition key cylinder 15, it is difficult to wire the harness 27 along the ignition key cylinder 15. Can also respond.

The present invention is not limited to the above embodiment, but can be modified or expanded as follows. The lead wire 28 may be wound around the terminal processing unit 23 a plurality of times. As the shape of the terminal processing unit 23, instead of the groove shape, a protrusion may be formed intermittently on the outer periphery of the boss, and a lead wire may be sandwiched between the protrusions.

[0031]

As is clear from the above description, according to the transmitting / receiving antenna coil of the present invention, the bobbin is provided with a terminal processing section for holding the lead wire in a wound state by pressing the lead wire around the bobbin. Since the stopper portion is provided to hold the leading end of the lead wire drawn out from the terminal processing section to the direction along the axial direction of the bobbin, the coil wound around the bobbin can be used. In the configuration in which the lead wire is drawn out, an excellent effect is obtained that the device can be manufactured at a low cost while being downsized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an antenna coil according to a first embodiment of the present invention.

FIG. 2 is a view corresponding to FIG. 1 shown from a different direction;

FIG. 3 is a schematic diagram showing the configuration of the entire system.

FIG. 4 is a left side view of the antenna coil.

FIG. 5 is a front view of the antenna coil.

FIG. 6 is a right side view of the antenna coil.

FIG. 7 is a longitudinal side view of the antenna coil.

FIG. 8 is a perspective view of a bobbin.

FIG. 9 is a view corresponding to FIG. 1, showing a second embodiment of the present invention.

FIG. 10 is a diagram corresponding to FIG.

FIG. 11 is a diagram corresponding to FIG. 4;

FIG. 12 is a diagram corresponding to FIG. 5;

FIG. 13 is a diagram corresponding to FIG. 6;

FIG. 14 is a diagram corresponding to FIG. 7;

FIG. 15 is a longitudinal sectional view of an antenna coil showing a terminal portion in a conventional example.

[Explanation of symbols]

11 is an ignition key, 13 is a transponder, 1
5 is an ignition key cylinder, 16 is an antenna coil, 21 is a bobbin, 22 is a coil mounting section, 23 is a terminal processing section, 24 is a coil, 27 is a harness, 28 is a lead wire, 31 is a stopper section, and 33 is an antenna coil. is there.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Sadao Kokubu 1 Noda, Toyota, Oguchi-machi, Oguchi-machi, Niwa-gun, Aichi Prefecture Tokai Rika Electric Machinery Works (56) References JP-A-4-334006 (JP, A) JP-A-8-49456 (JP, A) JP-A-8-165830 (JP, A) JP-A-3-111766 (JP, U) JP-A-4-134145 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E05B 19/00 B60R 16/02 630 E05B 49/00 E05B 65/00 G08B 21/00

Claims (1)

(57) [Claims] 1. A bobbin disposed to surround an ignition key cylinder into which an ignition key set with a transponder function is inserted, and a transponder coil wound around the outer periphery of the bobbin and provided to the ignition key. And a coil that is electromagnetically coupled,
A transmitting / receiving antenna coil having a lead wire drawn out of the coil, a terminal processing unit provided on the outer periphery of the bobbin so as to hold the lead wire in a wound state, and a terminal processing unit provided on the bobbin. The lead-out end of the lead wire that is drawn out from the part is placed in the axial direction of the bobbin.
A transmitting / receiving antenna coil, comprising: a stopper for holding the antenna coil in a direction along the transmission / reception antenna.