Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile
Patent
1995-06-09
1997-01-21
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Vehicle mounted systems
Automobile
180287, 307 101, 34082569, 343712, 343715, B60R 2500, H01Q 132
Patent
active
055962343
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of disposing an antenna of a remote control device for a vehicle which is applied to remote control devices for vehicles which remote-control the unlocking and locking of doors or the like of the vehicle, the starting of the engine, or the like.
BACKGROUND TECHNOLOGY
Conventionally, keyless entry systems have been proposed in which the unlocking and locking of a lock mechanism, which locks the doors of a vehicle, the luggage compartment door or the like with the doors in a closed state, is carried out without using a key. This keyless entry system is equipped with a portable transmitter. A switch for indicating unlocking or locking is provided at the transmitter. A code signal which is predetermined for each vehicle is transmitted in accordance with operation of the switch by the user.
The code signal transmitted from the transmitter is received by an antenna attached to the vehicle. By checking the received code signal with a code signal stored in advance, a determination is made as to whether the correct code signal has been received. In a case in which the correct code signal has been received, the lock mechanism is unlocked or locked by a driving means such as a solenoid or the like. In this way, locking and unlocking of the lock mechanism can be effected without using a manual key.
In a keyless entry system, the radio waves outputted from the transmitter are weak waves (500 .mu.V/m or less) which do not require a license stipulated by law. As a result, in order to reliably operate the keyless entry system in accordance with the designations of the user, efficient reception of the radio waves outputted from the transmitter is desired. In order to efficiently receive the radio waves in this way, it is preferable that the antenna is provided so as to project from the vehicle body. However, drawbacks arise in that, when the antenna is disposed in this way, the appearance of the vehicle deteriorates, and the workability when the antenna is attached to the vehicle is also low.
These drawbacks with respect to appearance and workability are solved by providing the antenna within the receiving unit. However, the position at which the receiving unit is disposed is generally a region which is difficult for the radio waves to reach and which has a low electrical field strength, such as within the luggage compartment space, under a seat, at the reverse side of the instrument panel or the like. Therefore, there are cases in which it is difficult to receive the radio waves.
DISCLOSURE OF THE INVENTION
The present invention has been achieved by taking the above facts into consideration, and an object thereof is to provide a method of disposing an antenna of a remote control device for a vehicle in which a remote control device for a vehicle can be reliably operated in accordance with designations of a user and without the appearance of the vehicle deteriorating.
In order to achieve the above-described object, in the method of disposing an antenna of a remote control device for a vehicle of the present invention which remote control device has a transmitter which transmits a predetermined radio wave determined in advance; an antenna disposed within a body of a vehicle; and process designating means for designating execution of a predetermined process in a case in which the predetermined radio wave is received by the antenna, the antenna is disposed so that a direction in which the efficiency of the antenna becomes a predetermined value or more and an opposing direction of a pair of conductors, among a plurality of conductors existing at the periphery of a region at which the antenna is disposed, whose opposing distance with the antenna therebetween is the smallest, substantially correspond.
The configuration of a vehicle body is complex. When a radio wave is transmitted from the transmitter toward the vehicle, there are various orientations of electrical fields generated within the body at the respective regions. However, the inventors of the present inv
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German Office Action for corresponding German Patent Application P 43 95 837. 035 with English Language Translation.
Iwasaki Yukio
Nakano Yoshio
Noda Takahisa
Shibagaki Yuji
Umeda Fumio
Elms Richard T.
Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho
Shoop Jr. William M.
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