JPH09303016A - Receiving antenna for wireless door locking device for vehicle, and wireless door locking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a directional characteristic without impairing the appearance of a cabin and save space by disposing a receiver and an antenna of a wireless door locking device in a meter hood and at its upper wall. SOLUTION: A receiver 40 for a wireless door locking device is disposed at the left end of a meter board 13 disposed parallel to a meter panel 12, in a meter hood 10 placed in a position easy to see from the outside of a vehicle, obliquely downward in front of a steering wheel H. A receiving antenna 30 of loop shape is mounted on the inner surface of an upper wall 11 of the meter hood 10. With this arrangement, the directional characteristic of the receiving antenna 30 can be always maintained to the same without impairing appearance in a cabin. Also since a part of the meter board 13 of the meter hood 10 is used as a board for the receiver 40, there is no need to provide special installation space for the receiver 40 so as to space-save in the cabin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiving antenna for a vehicle wireless door lock device and a wireless door lock device including the receiving antenna.

[0002]

2. Description of the Related Art In some vehicle wireless door lock devices, a receiving antenna is built into a receiver so as not to be exposed to the outside. According to this, the installation location of the receiver can be determined regardless of the installation location of the receiving antenna. In addition, the installation cost of the receiving antenna and the wiring cost are eliminated, which helps to reduce the cost of the wireless door lock device.

[0003]

By the way, since the position easily visible from the outside of the vehicle compartment is the position where it is easy to receive the transmission radio wave from the outside of the vehicle compartment, the receiver having the built-in receiving antenna as described above is It is desirable to install it in a position that is easy to see from the outside. However, if the receiver is installed in a position that is easily visible from the outside of the passenger compartment, the receiver will not look good in the passenger compartment. Therefore, it is necessary to install the receiver in a place that is not visible to passengers.

Therefore, the request to install the receiver in a place where the passengers cannot see it and the request to install the receiver, that is, the receiving antenna, in a position that is easily visible from the outside of the vehicle compartment
It can be said that they are physically incompatible. In addition, even if we could find a receiver installation position that meets these requirements,
Since this installation position changes depending on the vehicle body shape of the vehicle, it becomes necessary to examine the installation position for each vehicle.

In order to deal with the above, the present invention effectively utilizes the meter hood located at a position easily visible from the outside of the vehicle compartment of the vehicle to prevent the appearance of the vehicle interior from deteriorating. It is an object of the present invention to provide a reception antenna for a wireless door lock device of a vehicle that maintains good performance, and the wireless door lock device.

[0006]

In order to achieve the above object, according to the invention of claim 1, since the receiving antenna is provided in the meter hood, the receiving antenna is
It does not disturb the occupants in the passenger compartment. Further, since the receiving antenna is fixed inside the meter hood, the directional characteristics of the receiving antenna are always kept the same. Further, since the receiving antenna is located inside the meter hood which is easily visible from the outside of the vehicle, the receiving antenna can easily receive the radio wave transmitted from the transmitter through the meter hood.

According to the second aspect of the present invention, at least a part of the circuit of the receiver constituting the control means is arranged in a part of the meter board in the meter hood. As a result, a part of the meter board is also used as a board of at least a part of the circuit of the receiver. As a result, it is not necessary to separately consider the circuit installation space of at least a part of the receiver, which leads to cost reduction.

Further, according to the invention of claim 3, the receiving antenna for the wireless door lock device of the vehicle is arranged in the meter hood in the vehicle compartment. Therefore, the operation of the invention of claim 1 A reception antenna for a wireless door lock device that can achieve the effect can be provided.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a schematic block configuration of a vehicle wireless door lock device to which the present invention is applied. Here, as shown in FIG. 2, the meter hood 10 is arranged in the vehicle interior of the vehicle diagonally below and in front of the steering handle H. The upper wall 11 of the meter hood 10 extends rearward while curving upwardly from the lower edge of the front windshield F of the vehicle. A meter panel 12 is attached to the opening of the meter hood 10 on the steering handle H side. The meter hood 10 is made of electrically insulating resin.

The wireless door lock device has a door lock mechanism L mounted on the driver's seat door of the vehicle,
The door lock mechanism L is configured to lock the driver's seat door by the lock operation and unlock the driver's seat door by the unlock operation. Further, the wireless door lock device includes a transmitter 20 and a receiving antenna 30, and the transmitter 20 transmits a verification code for identifying the vehicle as a radio wave to the receiving antenna 30 by an operation of the owner of the transmitter. .

As shown in FIG. 2, the receiving antenna 30 comprises a loop antenna, and the receiving antenna 30 is mounted on the inner surface of the upper wall 11 of the meter hood 10. Then, this receiving antenna 30 is
The transmission radio wave of 0 is received through the meter hood 10 and is output to the receiver 40 as a reception signal. However, in recent years, the frequency of the radio wave used in the transmitter 40 is 300
Values around MHz are used. Therefore, as the receiving antenna 30, at least (1
/ 4) A length of about 25 cm, which is the wavelength, is required.
From this point, the length of the receiving antenna 30 is 25c.
m.

As shown in FIG. 2, the receiver 40 is disposed at the left end of the meter board 13 in the meter hood 10 in parallel with the meter panel 12. In addition,
The meter board 13 is provided with drive circuits for various meters such as a speedometer. The receiver 40 includes a signal processing circuit 41, and the signal processing circuit 41 is connected to the output terminal of the receiving antenna 30 via the wire harness 42a, the connector 42, and the wire harness 42b (see FIG. 2). The signal processing circuit 41 subjects the received signal of the receiving antenna 20 to amplification and demodulation waveform shaping processing, and generates a processed signal representing the collation code. The connector 4
2 and both wire harnesses 42a, 42b are fixed to the left end portion of the outer surface of the meter panel 12 shown in FIG.

Further, the receiver 40 includes a microcomputer 43, a memory 44 and an input circuit 45. The microcomputer 43 stores the processed signal from the signal processing circuit 41 and the data stored in the memory 44 (the collation data).
Based on the above, it is determined whether or not the verification data match, and an output indicating whether or not the door lock mechanism L is allowed to operate is output.
It outputs to the drive circuit 50 for driving the motor M for use.

Based on the output of the microcomputer 43, the drive circuit 50 prohibits the operation of the door lock mechanism L, or makes the operation of the door lock mechanism L either a lock operation or an unlock operation. , Motor M
Control. The input circuit 45 outputs the output of the door switch SW for detecting the open / closed state of the driver's door of the vehicle to the microcomputer 43. This output is used by the microcomputer 43 as a condition for determining whether output to the drive circuit 50 is possible.

In the present embodiment thus constructed, the meter hood 10 is located at a position where it can be easily seen from the outside of the vehicle, as described above. Therefore, the receiving antenna 30
Is in a position where it is easy to receive from the outside of the vehicle through a window. The length of the receiving antenna 30 has a value sufficient to receive the radio wave transmitted by the transmitter 20. Therefore, when a radio wave is transmitted from the transmitter 20, the radio wave is accurately received by the reception antenna 30, and is output to the receiver 40 as a reception signal through the connector 42.

Then, the drive circuit 50 locks or locks the door lock mechanism L via the motor M based on the output of the receiver 40. As a result, the driver's seat door is locked or unlocked. Here, since the receiving antenna 30 is provided in the meter hood 10, even if an occupant gets on the vehicle, the receiving antenna 30 does not disturb the occupant.

Further, since the receiving antenna 30 is fixed to the inner surface of the upper wall 11 of the meter hood 10, the directional characteristics of the receiving antenna 30 are always kept the same. Also,
The board of the receiver 40 is the meter board 1 in the meter hood 10.
Since it is also used as a part of 3, the receiver 40 can be provided in a part of the meter board 13. Therefore, it is not necessary to separately consider the installation space of the receiver 40, which leads to a reduction in the installation space.

In implementing the present invention, only the signal processing circuit 41 of the receiver 40 is used in the meter hood 10.
It may be arranged on a part of the meter substrate 13 inside. In implementing the present invention, the receiving antenna 3
0 may be integrated in the upper wall 11 of the meter hood 10 when the meter hood 10 is molded.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a vehicle wireless door lock device according to the present invention.

FIG. 2 is a partially cutaway perspective view showing a state in which the receiving antenna and the receiver shown in FIG. 1 are arranged in a meter hood.

[Explanation of symbols]

20 ... Transmitter, 30, 40 ... Receiver, L ... Door lock mechanism.

Claims (3)

[Claims] 1. A lock mechanism (L) for locking or unlocking a door of a vehicle in which a meter hood (10) is arranged in a vehicle compartment, and a receiving antenna (3) for receiving a radio wave transmitted by a transmitter (20).
0) and a control means (40, 50, M) for controlling the operation of the lock mechanism so as to lock or unlock the door based on the radio wave received by the receiving antenna, A wireless door lock device for a vehicle, wherein a receiving antenna is provided in the meter hood. 2. The control means includes a receiver (40) for generating an output signal based on a radio wave received by the receiving antenna, and controlling the operation of the lock mechanism by the output signal of the receiver, The vehicle wireless door lock device according to claim 1, wherein at least a part of a circuit of the machine is disposed on a part of a meter board in the meter hood. 3. A reception antenna for a wireless door lock device of a vehicle, wherein a meter hood (10) is provided in a vehicle compartment, the reception antenna for a wireless door lock device of a vehicle provided in the meter hood. antenna.