JP2734048B2 - Automotive antenna device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle antenna device used for a mobile phone or the like.

[Prior art and problems] Conventionally, in a car phone, transmission and reception are performed by using an antenna of a wireless device extending from a vehicle body, and it is necessary to extend the antenna to detect an incoming call even when a call is not performed. is there. For this reason, there is a possibility that the extended antenna may come into contact with an obstacle on the traveling road during traveling of the vehicle and break the antenna.

An object of the present invention is to provide an automobile antenna device capable of suppressing breakage of an antenna.

Means for Solving the Problems The present invention is provided in a telescopic manner, at least a first antenna for performing transmission, an actuator for expanding and contracting the first antenna, and an actuator provided in a vehicle compartment of an automobile, A second antenna that is smaller than the first antenna and performs only reception, and when an incoming call is detected by the second antenna, the actuator is driven to change the first antenna from the contracted state to the extended state. In addition, the gist of the present invention is a vehicle antenna device characterized by comprising control means for changing from an expanded state to a contracted state when transmission is completed.

[Operation] When the second antenna detects an incoming call, the control unit drives the actuator to change the first antenna from the contracted state to the extended state. When the transmission is completed, the control means changes the first antenna from the extended state to the contracted state. As a result, when no communication is performed, the first antenna is set in a contracted state, and a small second antenna provided in the vehicle compartment waits for an incoming call, and when communication is performed, transmission can be performed using the extended first antenna. .

Embodiment An embodiment in which the present invention is embodied in an antenna device provided in a mobile phone will be described below with reference to the drawings.

1 is a side view of the vehicle, and FIG. 2 is a plan view of the vehicle. At the corner of the rear trunk 2 of the vehicle 1, a first transmission and reception
An antenna 3 is provided. Further, a second antenna 4 dedicated to reception is provided behind the rear seat in the cabin of the vehicle 1.

The first antenna 3 will be described with reference to FIG. 3. A winding portion 5 is provided in the rear trunk 2, and a rod antenna portion 6b which is extendable with respect to the base cylinder 6a is connected to the winding portion 5. Have been. By driving the winding motor 7 as an actuator, the rod antenna section 6b can be extended and contracted. That is, the upper end of the rod antenna portion 6b can be extended to a predetermined height from the vehicle body surface 8 by performing the contracting operation to make the upper end of the rod antenna portion 6b flush with the vehicle body surface 8 and performing the extending operation.

As shown in FIG. 1, the radio 9 is disposed in the rear trunk 2 of the automobile. Further, a handset 10 is provided in a console box on the side of the driver's seat in the passenger compartment. The handset 10 includes a hook switch, a speaker, a handset, and the like. further,
A response hold switch 11, a response rejection switch 12, a first antenna elevating switch 13, and a first antenna elevating state monitoring device 14 are provided on the instrument panel near the steering wheel, and each switch 11, 12, 13 is operated by a driver. It is supposed to be. The answer hold switch 11 informs the wireless base station that the answer is held when a call is received from the mobile phone. The response rejection switch 12 stops outputting a ringing sound from the speaker of the handset 10 when a call is received from the car telephone.

The first antenna elevating switch 13 is a switch for manually raising or lowering the rod antenna portion 6b of the first antenna 3 when checking the first antenna 3 or the like. This is a device for displaying whether the first antenna 3 is in the housed state or the extended state.

FIG. 4 shows an electric circuit of a car telephone system provided with an antenna device.

The radio 9 includes a control circuit 15 as a control means and a modulation / demodulation circuit.
It comprises an antenna switch 16, an antenna switch 17, and a transmission / reception signal separator 18. The second antenna 4 is connected to the antenna switch 17, and the first antenna 3 is connected to the transmission / reception signal separator 18.

Then, the signal received by the second antenna 4 is input to the antenna switch 17, and the signal received by the first antenna 3 is transmitted through the transmission / reception signal separator 18 to the antenna switch 17.
Entered in 17. At the time of this reception, the control circuit 15 controls the antenna switch 17 to select the received signal of either the first antenna 3 or the second antenna 4 and output it to the modulation / demodulation circuit 16. Further, the received signal demodulated by the modulation / demodulation circuit 16 is input to the control circuit 15 so that a ringing tone is output from the speaker of the handset 10 and a voice is output from the handset during a call.

Also, the signal from the handset 10 transmitter is a modulation / demodulation circuit.
The signal is modulated at 16 and output from the first antenna 3 via the transmission / reception signal separator 18. The control circuit 15 detects the operation of the response hold switch 11 and the response rejection switch 12.

The control circuit 15 controls the drive of the winding motor 7 via the first antenna drive control circuit 19 to cause the rod antenna section 6b of the first antenna 3 to expand and contract. The operation of the first antenna elevating switch 13 causes the operation signal to drive the winding motor 7 via the first antenna drive control circuit 19. The first antenna drive control circuit 19 causes the first antenna up / down state monitor device 14 to display the state (the contracted state or the extended state) of the first antenna 3.

The operation of the car telephone thus constructed will be described with reference to FIG.

The control circuit 15 determines whether or not the hook switch of the handset 10 has been turned on in step 100. If the hook switch has been turned on, the process proceeds to step 109 described later. Control circuit 15
If the hook switch is off, it is determined in step 101 whether there is an incoming call. That is, it is determined whether or not there is an incoming call from the second antenna 4.

When there is an incoming call in step 101, the control circuit 15 determines whether or not the answer reject switch 12 is turned on in step 102, and if it is turned on, stops outputting the ringing sound from the speaker of the handset 10 in step 103. . Therefore, the user can turn off the ringing tone even if there is an incoming call by turning on the response rejection switch 12.

The control circuit 15 determines in step 102 that the response reject switch 1
If it is determined that the switch 2 has not been turned on, it is determined in step 104 whether the response hold switch 11 has been turned on. If the switch has been turned on, in step 105, the rod antenna section 6b of the first antenna 3 is raised. The drive of the winding motor 7 is controlled. Further, the control circuit 15 uses the first antenna 3 to transmit a signal indicating that the response is rejected to the ground base station using the first antenna 3 in step 106, and then lowers the rod antenna section 6b of the first antenna 3 in step 107 The winding motor 7 is driven so as to be stored in the trunk 2.

In step 104, the control circuit 15
If it is determined that 1 has not been turned on, it is determined in step 108 whether the hook switch of the handset 10 is on. If the hook switch is off, the process returns to step 102; Rod antenna section 6b
The drive of the winding motor 7 is controlled so as to raise the pressure. Thereafter, when a telephone call is made and the telephone goes off-hook with the end of the telephone call, the control circuit 15 detects the off operation of the hook switch of the handset 10 in step 110, and moves down the rod antenna section 6b of the first antenna 3 in step 111. The winding motor 7 is driven so as to be stored in the rear trunk 2.

When the rod antenna portion 6b of the first antenna 3 is to be expanded and contracted for inspection of the first antenna 3, the first antenna up / down switch 13 is operated to perform the antenna extension operation and the contraction operation at any timing. be able to.

Thus, in the present embodiment, the first transmission / reception
The antenna 3 is made to be able to expand and contract, so that the first antenna 3 can be made to expand and contract by driving the winding motor 7.
A second antenna 4 for performing only reception is provided in the passenger compartment, and when the control circuit 15 detects an incoming call by the second antenna 4, the winding motor 7 is driven to move the first antenna 3 from its contracted state. It was made to be in an extended state. Therefore,
When no call is made, the small second antenna 4 waits for an incoming call, so that the first antenna 3 housed in the rear trunk 2 does not come into contact with an obstacle on the traveling road and break during traveling of the vehicle. Further, during a call, transmission and reception can be performed by the extended first antenna 3.

Note that the present invention is not limited to the above embodiment. For example, in the above embodiment, the second antenna is provided indoors, but a small antenna may be provided outside the vehicle compartment. or,
The first antenna is not limited to the one that can transmit and receive, and may perform only transmission. That is, reception may be performed by the second antenna and transmission may be performed by the first antenna.

Further, the present vehicle antenna device may be used for other communication devices of a mobile phone.

[Effects of the Invention] As described in detail above, according to the present invention, the second antenna for incoming call detection, which is always required to be in the extended state, is provided in the vehicle cabin, so that contact with an obstacle during movement is possible. And breakage can be prevented. In addition, the first
The antenna is expanded from the contracted state when an incoming call is detected by the second antenna and contracted again after the transmission is completed, thereby reducing the chance of contact with an obstacle, thereby preventing breakage of both the first antenna and the second antenna. It can be reduced as much as possible.

[Brief description of the drawings]

FIG. 1 is a side view of a vehicle of an embodiment embodied in an antenna device provided in an automobile telephone, FIG. 2 is a plan view of the same vehicle, FIG. 3 is a schematic diagram of a first antenna, and FIG. FIG. 5 is a flow chart for explaining the operation. 3 is a first antenna, 4 is a second antenna, 7 is a winding motor as an actuator, and 15 is a control circuit as control means.

Claims (1)

(57) [Claims] A first antenna for telescopic transmission, an actuator for extending and retracting the first antenna, and an actuator provided in a vehicle interior of a vehicle, being smaller than the first antenna, A second antenna for performing only reception, and when an incoming call is detected by the second antenna, the actuator is driven to change the first antenna from the contracted state to the expanded state, and when transmission is completed, the expanded state is set. And a control unit for changing the state of the vehicle from a contracted state to a contracted state.