KR20020040493A - vehicle radio antenna with sun visor - Google Patents

Abstract

PURPOSE: A device of antenna for automobile using sun visor is provided to overcome the limit of a radio antenna of an automobile using a sun visor, improve sensibility of receiving radio wave and feed practical car antenna having high quality without distortion. CONSTITUTION: A device of antenna for automobile using sun visor is comprised of right and left sun visors(SV1)(SV2) of panel type installed in a car; an antenna part(10) having four F.M(Frequency Modulation) antennas installed two by two as each independent terminal in the two sun visors of right and left sides and A.M(Amplitude Modulation) antennas installed independently in two sun visors and fetched from the terminals to a common terminal; an antenna control part(20) detecting a signal level transferred from four F.M antennas in the antenna part to a receiver(40) and connecting the highest level of signal to the receiver selectively by a control switch(22). The antenna control part is inserted between the antenna part and the receiver and consists of a matrix(21) having for signal output section collecting four F.M antennas(FM1, FM2, FM3, FM4) of the antenna part by each independent terminal; a control switch connected with four signal output section of the matrix electrically and selecting an output section electrically according to a controlling signal; a detector detecting a level of F.M signal in circuit transferred from an amplifier(41) of the receiver to a demodulator(42); a distortion control circuit(23) comparing the level of F.M signal detected from the detector with the previously fixed level value and controlling the highest level of F.M antenna selectively by impressing the control signal from the control switch if the level of F.M signal is lower than the fixed level value. The control switch selects the highest level of F.M antenna of four F.M antennas and the maximum receiving sensibility is always inputted to the receiver.

Description

Automotive radio device with sun visor {vehicle radio antenna with sun visor}

The present invention relates to a radio antenna for an automobile, and more particularly, to an improvement of an antenna device using a sun visor of an automobile.

Among the radio antenna apparatus for automobiles, there is a line design provided by the present applicant as Utility Model Publication No. 1999-138481 as a radio antenna apparatus using the sun visor installed in the driver's seat and the passenger seat.

The antenna device of the wire design is to implement a function of a radio antenna by installing a conductor having excellent absorption of radio waves on its surface or on one side by using a sun visor installed in most automobiles, the specific configuration of the wire A conductor having excellent electric wave flow on the surface of the visor is fixed to the line visor with a foaming agent, and the conductor is connected to a shield wire connected to the receiving filtering unit by a connector.

According to the above-described configuration, since the car radio antenna is provided in the sun visor in the car interior, there is less risk of damage or damage compared to the antennas that are exposed to the exterior of the conventional car, and does not impair the aesthetic appearance of the car. In addition, since the car antenna is provided in the sun visor which is easily separated from the vehicle body, the manufacturing cost can be lowered compared to conventional antennas and film antennas which are installed on the rear glass as a coating type. In the assembly process to the car, no additional fixing parts are required, and it can be easily assembled in a simple process without linking with other bodies or parts.In case of damage, it is easy to repair or replace without disassembling the car parts or the car body. It is said to be possible.

However, in the antenna device using the sun visor, which is implemented by the wire design of the above configuration, some problems arise in practical terms.

Importantly, according to the antenna wiring structure installed in the sun visor by the wire design, the sensitivity of the radio wave received in the vehicle interior is very low due to the characteristics of the radio frequency, and the shape of the antenna is a single type on the surface of one sun visor. Since it can be formed only in the case of a moving vehicle is generally a high propagation distortion rate is that the listening quality is deteriorated.

When the sensitivity of the received radio wave is low, it may be improved to some extent by increasing the performance of the amplifier. However, since the distortion rate of the radio wave is affected by the relative position of the radio wave and the antenna line, it is very difficult to improve the electronic circuit alone in the single type antenna.

Therefore, the single-type antenna provided by the line design had a problem such that the price is increased to increase the practicality, but there is a limit in improving the listening quality.

The present invention is provided to solve the problems of the car antenna device provided by the car sun visor having the antenna function of the line design as described above, an object of the present invention is a plurality of FM each independent of the left and right sun visor in the vehicle interior By arranging the antenna wires and selectively connecting them to the receiver, it overcomes the limitations of the car radio antenna using the sun visor to provide a high-quality practical automotive antenna that increases the sensitivity of the received radio wave and has little propagation distortion. It is in

Figure 1 is an embodiment of the configuration of the antenna unit of the antenna device for a vehicle according to the present invention

Figure 2 is a block diagram of an embodiment of a vehicle antenna apparatus according to the present invention using the antenna unit of the embodiment

(Short description of symbols for the main parts of the drawing)

SV1, SV2: left and right sun visor

10: antenna part 20: antenna control part

21: Matrix 22: Control switch

23: distortion control circuit 24: detector

30: Low Noise Shear Amplifier 40: Receiver

41: amplifier 42: demodulator

FM1, FM2, FM3, FM4: FM antenna

AM: AM antenna

The configuration of the antenna device for vehicles using the sun visor of the present invention for achieving the above object,

Panel-type left and right sun visors installed in the vehicle interior, and four FM antennas and two left and right sun visors each installed as two independent terminals on the two left and right sun visors, respectively. The terminals detect the signal level transmitted to the receiver from four antennas of the antenna, and the highest level among them. An antenna control unit selectively connected to the receiver by a switch is characterized in that the configuration is placed between the antenna unit and the receiver.

More preferably, the present invention may further include a low noise shear amplification means for filtering and amplifying a signal selected and output by the antenna controller between the antenna controller and the receiver.

Hereinafter, the present invention will be described in detail with reference to a preferred embodiment.

Figure 1 shows an embodiment of the configuration of the antenna unit of the antenna device for a vehicle according to the present invention,

Figure 2 shows a block diagram of an embodiment of a vehicle antenna device according to the present invention using the antenna unit of the embodiment.

As shown in the drawing, an antenna device for automobiles includes an antenna unit 10 installed on left and right sun visors SV1 and SV2 having a panel shape that is left and right in a vehicle. An antenna controller 30 for selecting any one of the FM signals input from the antenna unit 10, a low noise front end amplifier 30 for filtering and amplifying the signal selected and output from the antenna controller 20; And a receiver 40 configured to receive a signal output from the low noise front end amplifier 30 and operate the radio by means of an amplifier 41, a demodulator 42 and other circuits.

The antenna unit 10 uses left and right sun visors SV1 and SV2 in the form of a panel that is long to the left and right, and in each of them, two left and right sides which are installed in accordance with the FM propagation characteristics and drawn out to independent terminals, respectively. FM antennas (FM1, FM2, FM3, FM4) and two AM antennas (AM), which are installed at each of the left and right sides with short lengths and are drawn out to one terminal according to the characteristics of the AM propagation characteristics.

The antenna controller 20 is disposed between the antenna unit 10 and the receiver 40, and each of the four FM antennas FM1, FM2, FM3, and FM4 of the antenna unit 10 is independent. A matrix switch 21 having four signal output units and electrically connected to the four signal output units of the matrix 21, and a control switch for electronically selecting one output unit according to a control signal ( 22) and detect the level of the FM signal on a circuit from the amplifier 41 of the receiver 40 to the demodulator 42 after the FM signal selected by the control switch 22 passes through the low noise front end amplifier 30. And a control signal is applied to the control switch 22 when the level of the FM signal detected by the detector 24 is compared with a preset level value. To select the antenna Distortion control circuit 23 for controlling.

According to an embodiment automotive antenna device of such a configuration,

The FM antennas (FM1, FM2, FM3, FM4) drawn out to four independent terminals across the two left and right sun visors SV1 (SV2) and two AM antennas connected to one terminal are installed. When the four FM signals are input to the control switch 22 through the matrix 21 from the antenna unit 10, the four FM signals are input to the receiver 40 via the low noise front end receiver amplifier 30 while being connected to any one terminal. The signal input to the receiver 40 passes through the amplifier 41, through the demodulator 42, and other circuits to operate the radio.

In this process, the distortion control circuit 23 continuously detects the FM signal transmitted from the amplifier 41 of the receiver 40 to the demodulator 42 with the detector 24, and sets the level of the detected FM signal in advance. The control signal 22 is applied to the control switch 22 so as to select the highest level of the FM antenna when the level value is less than or equal to the level value calculated by comparing with the level value. The control switch 22 receives four FM antennas FM1, Since the FM antenna of the highest level is selected among the FM2, FM3, and FM4, the FM signal of the maximum reception sensitivity is always input to the receiver 40.

According to the above operation, the FM antenna formed in the conventional single type is almost fixedly having 20-24% of distortion, whereas in the configuration of the present invention, the maximum reception sensitivity is achieved in four FM antennas. By selecting any one having a connection can be lowered to the maximum distortion.

In the present invention, the shapes of the FM antenna and the AM antenna of the embodiment installed in the sun visor are not limited thereto, but are limited to various forms according to the material of the antenna and the shape of the sun visor. You can do it.

Like the antenna device for automobile according to the embodiment of the present invention described above, the present invention uses the configuration of the antenna unit by using both the left and right two sun visors, and each of the two FM antennas and one antenna on each of the left and right sun visors. A single type using a single side sun visor is provided between the antenna unit and the receiver, and having an antenna controller for continuously detecting the signal level transmitted from the antenna unit to the receiver and connecting the FM antenna having the maximum reception sensitivity. To solve the problem of the antenna device of the line design,

The best listening quality can be obtained by operating the receiver with the maximum reception sensitivity by almost eliminating the 20-24% propagation distortion caused by the single type FM antenna while driving the car. It is possible to provide a high quality car antenna.

Claims (3)

In constructing an automotive antenna device using a sun visor installed in a car interior, four panel panels are provided with two independent terminals in the left and right sun visors of the panel type and two sun visors, respectively. Independently installed in the FM antenna and the left and right two sun visors, the terminals are composed of AM antennas, which are drawn out to one common terminal, and receivers at four FM antennas of the antenna unit. A sun visor, which detects each signal level transmitted to and selectively connects the highest level signal to the receiver by a control switch, is placed between the antenna unit and the receiver. Automotive antenna device using. The antenna control unit of claim 1, wherein the antenna controller is disposed between the antenna unit and the receiver to accommodate four FM antennas FM1, FM2, FM3, and FM4 of the antenna unit 10 as independent terminals. A matrix 21 having a signal output section, a control switch 22 electrically connected to the four signal output sections of the matrix 21 for electronically selecting one output section according to a control signal, and A detector 24 for detecting the level of the FM signal on a circuit from which the FM signal selected by the control switch 22 is transmitted from the amplifier 41 of the receiver 40 to the demodulator 42, and detected by the detector 24; A distortion control circuit 23 for controlling the selection of the highest level FM antenna by applying a control signal to the control switch 22 when the level of the FM signal is calculated by comparing with the preset level value. Automobile antenna apparatus using the sun visor, characterized in that the configuration in comparison. The antenna device of claim 1, wherein a low noise shear receiving amplification means is provided between the antenna controller and the receiver to filter and amplify the signal selected and output by the antenna controller.