WO2008035700A1

WO2008035700A1 - Vehicle antenna device

Info

Publication number: WO2008035700A1
Application number: PCT/JP2007/068158
Authority: WO
Inventors: Kouichi Tsurumaki
Original assignee: Alpha Corporation
Priority date: 2006-09-22
Filing date: 2007-09-19
Publication date: 2008-03-27
Also published as: JP2008079118A

Abstract

A vehicle antenna device arranged in a door handle (1) includes a first antenna (11) which transmits and receives a communication radio wave to/from a key radio mobile device; and a second antenna (12) which transmits and receives a communication radio wave to/from a card radio mobile device. The second antenna (12) has a different frequency band of the transmission/reception radio wave from the first antenna (11). The first antenna (11) and the second antenna (12) generate magnetic fields whose directions are substantially orthogonal.

Description

Specification

Single antenna device

Technical field

TECHNICAL FIELD [0001] The present invention relates to a vehicular antenna device applied to a keyless system that can perform door locking and unlocking of an automobile without a key.

Background art

[0002] In recent years, various key entry systems that can lock and unlock automobile doors without a key have been proposed. The keyless entry system includes a wireless portable device carried by the vehicle owner, a vehicle antenna, a vehicle-side transceiver, and a vehicle-side control unit. The keyless entry system communicates wirelessly between the wireless portable device and the vehicle-side transceiver. When the portable device is authenticated by the vehicle-side control unit, the door is automatically locked and unlocked.

[0003] By the way, as a wireless portable device, a system using a key wireless portable device dedicated to an automobile key has been common. Such a system is disclosed in, for example, Japanese Patent Publication No. 2006-197503 (Patent Document 1). On the other hand, recently, a system using a card wireless portable device composed of a multipurpose IC card has been proposed. This system is disclosed in, for example, Japanese Patent Publication No. 3507153 (Patent Document 2). Since the communication frequency differs between a system using a key wireless handset and a system using a card wireless handset, two antennas (two types) are attached to the vehicle in order to be able to use both systems. It is necessary to install.

[0004] However, as described above, in both systems, if two (two types) antennas are simply arranged in the vicinity, they may be adversely affected by mutual inductance and may not perform a desired antenna function.

Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle antenna device in which two (two types) antennas do not impede the performance of each antenna. It is in.

Disclosure of the invention

In order to achieve the above object, a vehicle antenna device according to the first aspect of the present invention is provided. A first antenna that transmits and receives radio waves with the first portable device; and a radio that transmits and receives radio waves with the second portable device, and the first antenna transmits and receives radio waves. Second antenna having different frequency bands; In the above configuration, the first antenna and the second antenna are arranged such that directions of magnetic fields generated from each other are substantially orthogonal to each other.

[0007] Therefore, according to the first aspect, the magnetic field generated by the first antenna and the magnetic field generated by the second antenna are substantially orthogonal to each other and are not adversely affected by mutual inductance. The antenna does not hinder the performance of each antenna.

[0008] The vehicular antenna apparatus according to the second aspect of the present invention, which is dependent on the first aspect, includes the first antenna and the second antenna housed in a door handle.

[0009] Therefore, according to the second aspect, since the user is positioned near the door handle when getting on and off, the communication with the first and second portable devices is excellent.

[0010] The vehicle antenna device according to the third aspect of the present invention that is dependent on the first aspect or the second aspect is the device, wherein the second antenna is a door handle body of the door handle and the first antenna. It is arranged between.

[0011] Therefore, according to the above third aspect, the force S can be accommodated in a compact housing of the first antenna and the second antenna.

[0012] The vehicle antenna device according to a fourth aspect of the present invention, which is dependent on any one of the first aspect to the third aspect, is the device, wherein the first antenna is the door handle. A rod-shaped core portion disposed along the longitudinal direction, and a pair of coil portions wound around both ends of the core portion; and in the center of the first antenna, the core portion and the pair of core portions A recess surrounded by the coil portion is formed; and the second antenna is disposed so as to enter the recess.

[0013] Therefore, according to the fourth aspect, the force S can be further accommodated to further accommodate the first antenna and the second antenna.

Brief Description of Drawings

FIG. 1 shows an embodiment of the present invention, and shows a door handle in which a vehicle antenna device is accommodated. It is a longitudinal cross-sectional view.

FIG. 2 is a cross-sectional view of a door handle in which a vehicle antenna device is housed according to an embodiment of the present invention.

FIG. 3 is a perspective view of the first antenna according to the embodiment of the present invention.

FIG. 4 is a perspective view of a second antenna, showing an embodiment of the present invention.

FIG. 5 is a diagram showing a magnetic field generated by the first antenna and the second antenna in the embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 5 show an embodiment of the present invention, FIG. 1 is a longitudinal sectional view of a door handle in which a vehicle antenna device is accommodated, and FIG. 2 is a transverse sectional view of the door handle in which a vehicle antenna device is accommodated. 3 is a perspective view of the first antenna, FIG. 4 is a perspective view of the second antenna, and FIG. 5 is a diagram showing the magnetic field generated by the first antenna and the second antenna.

In FIG. 1 and FIG. 2, a door handle 1 outside the door is composed of a handle body 2 and a cover handle 3 located outside the vehicle, and the grip handle that can be gripped by the operator as a whole as a whole. It has a saddle shape! The operator can open and close the door (not shown) by holding the door handle 1 and rotating it.

[0017] One end of the handle body 2 is pivotally supported by a base member (not shown) fixed to the door panel, and a lock engaging portion 2a is provided on the other end for engaging a lock mechanism (not shown). ing. The locking mechanism (not shown) can be changed between a locked position that prevents rotation of the door handle 1 located in the closed position in the opening direction and an unlocked position that allows rotation of the door handle 1 in the opening direction. Locking / unlocking state of the locking mechanism is controlled by control means (not shown). A request switch 4 is provided on the outer surface of the handle body 2. The request switch 4 is a push-down switch, and this input information is output to control means (not shown). The detailed configuration of the control means will be described below.

[0018] The cover handle 3 is formed of, for example, an elastomer resin having flexibility, and is assembled to the handle body 2 by using, for example, a stagnation deformation. The vehicle antenna device 10 is housed in the door handle 1 thus configured! [0019] The vehicular antenna device 10 is a first antenna 11 in a low frequency band that transmits and receives communication radio waves to and from a key wireless portable device (not shown) that is a first portable device, and a second portable device. It has a second antenna 12 that transmits / receives communication radio waves to / from a card wireless portable device (not shown) having a non-contact IC force and has a frequency band different from that of the first antenna 11.

As shown in FIG. 3, the first antenna 11 includes an antenna body 13 including a coil wound around a rod-shaped core member disposed along the longitudinal direction of the door handle 1, and the antenna body. A pair of bobbins 14 and 14 are provided at both ends of 13. Bobbins 14 and 14 are antenna holding members that hold the first antenna 11 and the second antenna 12 in the door handle 1, and are installed in the door handle 1 from the vibration of the vehicle and the impact when the door is opened and closed. It functions as a cushioning material to protect the first antenna 11 and the second antenna 12. In the center of the first antenna 11, a recess 11a surrounded by the antenna body 13 and the pair of bobbins 14 and 14 is formed. The first antenna 11 is disposed in the antenna holding frames 3a and 3b of the cover handle 3! /, And the mounting portion 13a extending from the antenna body 13 is locked to the locking portion 3c of the cover handle 3. For example, the first antenna 11 is attached to the cover handle 3.

As shown in FIG. 4, the second antenna 12 includes a coil portion 15 wound in a ring shape, and a sealing resin portion 16 that seals the coil portion 15, and has an eccentric square shape as a whole. have . The eccentric square-shaped second antenna 12 is arranged so as to enter the recess 11 a of the first antenna 11. The second antenna 12 is bonded to the first antenna 11 with a double-sided tape 17. That is, the first antenna 11 and the second antenna 12 are accommodated in the door handle 1 as an integrated object.

As shown in FIG. 5, the first antenna 11 and the second antenna 12 are arranged so that the directions of the magnetic fields generated from each other are substantially orthogonal.

The first antenna 11 and the second antenna 12 are transmitted and received on the vehicle body side via the cable 20.

(Not shown). The transmission / reception means on the vehicle body processes the received signals from the first antenna 11 and the second antenna 12 and outputs them to the control means (not shown). The transmission signal is output to both the first antenna 11 and the second antenna 12 independently. That is, a wireless system that supports both key wireless portable devices (not shown) and card wireless portable devices (not shown) is configured! [0024] When the operation information from the request switch 4 is input, the control means (not shown) outputs a communication start command to the transmission / reception means (not shown). When an ID signal is sent from the transmission / reception means, it is determined whether or not the ID signal matches a predetermined ID signal. If the ID signal matches, control is performed to change the locking / unlocking state of the lock mechanism. . That is, control is performed so as to change to the unlocked state if the lock mechanism is in the locked state and to the locked state if it is in the unlocked state.

Next, the operation of the above configuration will be described. First, when using a key wireless portable device (not shown) to get off the vehicle and locking it, the driver carrying the key wireless portable device (not shown) goes out of the vehicle, closes the door, Operates request switch 4. When the request switch 4 is operated, the transmission / reception means operates to transmit a communication radio wave from the first antenna 11 and communicate with a key wireless portable device (not shown). When the key wireless portable device (not shown) is authenticated by the control means (not shown) by communication, the control means (not shown) changes the lock mechanism (not shown) from the unlocked state to the locked state. As a result, a person who does not carry a key wireless portable device (not shown) cannot open the door even if the door handle 1 is opened.

[0026] When the user rides on a vehicle locked using a key wireless portable device (not shown), the driver or the like carrying the key wireless portable device (not shown) operates the quest switch 4. When the request switch ₄ is operated, the transmission / reception means operates to transmit a communication radio wave from the first antenna 11 and communicate with a key wireless portable device (not shown). When the key wireless portable device (not shown) is authenticated by the control means (not shown) by the communication, the control means (not shown) force S lock mechanism (not shown) is changed from the locked state to the unlocked state. Thus, when the driver or the like performs the opening operation while holding the door handle 1, the door can be opened.

[0027] When locking / unlocking from outside the vehicle using a card wireless portable device (not shown), the card wireless portable device (not shown) should be brought close to the door handle 1! /. When the card wireless portable device comes close to the effective communication area formed by the radio wave emitted from the second antenna due to the proximity of the card wireless portable device, reading by electromagnetic induction is started, and induced electric power is transmitted to the card wireless portable device. When electric power is supplied and the information of the card wireless portable device is transmitted to the second antenna, the control means (not shown) controls locking and unlocking.

[0028] In the above-described operation, the first antenna 11 and the second antenna 12 of the vehicle antenna device 10 receive radio waves and transmit radio waves. Here, as shown in Figure 5 Since the magnetic field generated by the first antenna 11 and the magnetic field generated by the second antenna 12 are almost perpendicular to each other and no magnetic force is generated in the same magnetic flux direction, there is an adverse effect due to the mutual inductance generated between the coils. Does not reach. Therefore, the first and second antennas 11 and 12 can perform good communication with the respective antennas without extremely reducing the communication performance due to the mutual inductance having the effect of suppressing the magnetic force.

In this embodiment, the first antenna 11 and the second antenna 12 are accommodated in the door handle 1. Since the user is located near the door handle 1 when getting on and off, the user is excellent in communication with a key wireless portable device (not shown) or a card wireless portable device (not shown).

In this embodiment, the first antenna 11 includes a rod-shaped antenna main body 13 arranged along the longitudinal direction of the door handle 1 and a pair of bobbins 14 provided at both ends of the antenna main body 13. , 14, and a concave portion 11a surrounded by the antenna body 13 and the pair of bobbins 14, 14 is formed at the center of the first antenna 11, and the second antenna 12 is inserted into the concave portion 11a. Has been placed. Therefore, the first antenna 11 and the second antenna 12 can be accommodated in a compact manner.

In this embodiment, since the first antenna 11 and the second antenna 12 are attached via the double-sided tape 17, the first and second antennas 11 and 12 can be handled as a unit, and the door handle The accommodation work in 1 is easy.

[0032] The entire contents of Japanese Patent Application No. 2006-257503 (filed on September 22, 2006)

, Incorporated herein by reference.

[0033] The present invention is not limited to the description of the above-described embodiments of the invention, and can be implemented in various other modes by making appropriate modifications.

Claims

The scope of the claims

[1] Vehicle antenna devices include:

A first antenna for transmitting and receiving radio waves with the first portable device; and

A second antenna that transmits and receives radio waves to and from the second portable device, and has a frequency band different from that of the first antenna;

In the above configuration,

The first antenna and the second antenna are arranged so that directions of magnetic fields generated from each other are substantially orthogonal.

[2] In the vehicle antenna device according to claim 1,

The first antenna and the second antenna are accommodated in a door handle.

[3] The vehicle antenna device according to claim 2,

The second antenna is disposed between a door handle body of the door handle and the first antenna.

[4] The vehicle antenna device according to claim 3,

The first antenna includes a rod-shaped core portion disposed along a longitudinal direction of the door handle, and a pair of coil portions wound around both ends of the core portion;

A concave portion surrounded by the core portion and the pair of coil portions is formed in the center of the first antenna; and

The second antenna is disposed so as to enter the recess.