JP5451249B2 - Connector and vehicle window glass - Google Patents

Description

  The present invention relates to a connector fixed to a vehicle window glass plate and connected to an antenna formed on the vehicle window glass, and a vehicle window glass mounted with the connector.

  In recent vehicles, a tuner unit or the like, which is a communication device that receives terrestrial digital television broadcasting in addition to FM broadcasting and AM broadcasting, is mounted. Such a vehicle window glass plate is generally provided with a glass antenna formed by printing a conductive paste or the like on the window glass plate.

  In the glass antenna, a dedicated connector having an electric circuit such as an amplifier circuit is connected to the power feeding portion of the glass antenna, and is connected to a tuner unit or the like in the vehicle via the connector via a communication cable. The connector is held by a holding member or the like fixed to the vehicle window glass plate and attached to the vehicle window glass plate.

  The connector fixed to the vehicle window glass plate is required to have durability that can withstand various changes in the external environment of the vehicle. For example, the connector needs to be fixed to the vehicle window glass plate with a strength that can withstand vibrations or the like when the vehicle travels. The connector case or the like needs to be designed so as to avoid poor conduction due to moisture penetration. The electrical circuit built in the connector needs to be designed so as to be able to cope with the temperature change of the vehicle and the vehicle window glass plate due to the temperature change outside the vehicle. Moreover, it is preferable that the connector fixed to the window glass board for vehicles is small if the external appearance of a vehicle is considered.

  In the conventional connector, various ideas have been made to satisfy the above-described requirements. For example, in Patent Document 1, in an electrical connection device connected to a conductor formed on a glass plate by fitting an electrode terminal joined to a conductor formed on a window glass and an electrode gripping fitting, It is described that when the apparatus is mounted on a glass plate, a gap is provided between the housing and the glass plate, and the evaporation of moisture is promoted by the flow of air. Further, Patent Document 2 describes a circuit board built-in connector and a catch that can be miniaturized and have high cable disconnection strength.

JP-A-2005-243660 JP 2008-35479 A

  However, in the above-described conventional technology, it is difficult to design an electrical circuit built in the connector so that it can cope with a temperature change of the vehicle or the window glass plate for the vehicle and to reduce the size of the connector for the following reasons. .

  In order to reduce the size of the connector, it is necessary to mount the electrical circuit built in the connector densely on the board, but when the electrical circuit is densely mounted, the temperature of the board rises due to heat generation of the electrical circuit. To do. In this state, when the temperature of the vehicle or the vehicle window glass plate rises, the temperature of the substrate further rises, and the possibility that the electric circuit is damaged increases.

  In view of the above circumstances, the present invention has been made to solve this problem, and provides a connector that is small in size and that is guaranteed to operate even at high temperatures, and a vehicle window glass equipped with the connector. It is the purpose.

  The present invention employs the following configuration in order to achieve the above object.

The present invention is a connector fixed to a vehicle window glass and connected to an antenna conductor provided on the vehicle window glass, the connection terminal electrically connected to the antenna conductor, and via the connection terminal And amplifying means for amplifying the received signal received by the antenna conductor, and a signal output terminal for outputting the signal amplified by the amplifying means to a communication device mounted on a vehicle, the amplifying means comprising: An amplifier circuit, a power supply circuit that is connected to the amplifier circuit and supplies a power supply voltage, and a voltage dividing circuit that divides the power supply voltage having a thermistor, so that current consumption decreases as the ambient temperature of the thermistor increases. When the ambient temperature of the thermistor exceeds a predetermined temperature, the current supplied to the amplifier circuit is made smaller than before the ambient temperature exceeds the predetermined temperature. Serial to increase the ratio to reduce the current supplied to the amplifier circuit, to provide a connector which is characterized by having a current limiting circuit for limiting the current supplied to the amplifier circuit.

  In the connector of the present invention, the current limiting circuit includes a differential amplifier circuit and a transistor, and a constant voltage generated from the power supply voltage is supplied to an inverting input terminal of the differential amplifier circuit. The power supply voltage divided by the voltage dividing circuit is supplied to the non-inverting input terminal of the dynamic amplifier circuit, the output of the differential amplifier circuit is supplied to the base of the transistor, and the collector of the transistor is The transistor may be connected to an amplifier circuit and the emitter of the transistor may be grounded.

  In the connector of the present invention, the amplifier circuit includes an AM amplifier circuit that amplifies the AM signal received from the antenna conductor, and an FM amplifier circuit that amplifies the FM signal received from the antenna conductor, The AM amplifier circuit and the FM amplifier circuit may be provided in parallel and connected to the current limiting circuit.

  In the connector of the present invention, the connector is connected between the connection terminal and the amplifying means, and has an input circuit for matching impedance, and the received signal is input to the amplifying means via the input circuit. It is good also as a structure.

  In the connector of the present invention, the input circuit includes an AM input circuit and an FM input circuit, and the reception signal is input to the AM amplifier circuit via the AM input circuit, and the FM amplifier circuit is connected to the FM amplifier circuit. The reception signal may be input via the FM input circuit.

  The connector according to the present invention may be configured to include an output circuit that is connected between the amplifying unit and the signal output terminal and that matches impedance.

  The connector of the present invention may have a case that covers the periphery of the amplification means, the input circuit, and the output circuit, and the case is filled with resin.

  Moreover, the connector of this invention WHEREIN: The said signal output terminal is good also as a structure which has a cable insertion part which can be attached or detached with the communication cable connected to the said communication apparatus.

Furthermore, the present invention provides a vehicle window glass comprising an antenna conductor and a connector connected to the antenna conductor, wherein the connector includes a connection terminal electrically connected to the antenna conductor, and the connection terminal. Amplifying means for amplifying the received signal received by the antenna conductor sent via the signal, and a signal output terminal for outputting the signal amplified by the amplifying means to a communication device mounted on a vehicle, the amplifying means The current consumption is reduced as the ambient temperature of the thermistor is reduced by the amplifier circuit, the power supply circuit connected to the amplifier circuit for supplying the power supply voltage, and the voltage dividing circuit for dividing the power supply voltage having the thermistor. The current supplied to the amplifier circuit is reduced so that when the ambient temperature of the thermistor exceeds a predetermined temperature, the ambient temperature exceeds the predetermined temperature. To increase the ratio to reduce the current supplied to the amplifier circuit than before, to provide a vehicle window glass, characterized in that to limit the current supplied to the amplifier circuit.

  In the vehicle window glass of the present invention, the current limiting circuit includes a differential amplifier circuit and a transistor, and a constant voltage generated from the power supply voltage is supplied to an inverting input terminal of the differential amplifier circuit. The power supply voltage divided by the voltage dividing circuit is supplied to the non-inverting input terminal of the differential amplifier circuit, and the output of the differential amplifier circuit is supplied to the base of the transistor. The collector may be connected to the amplifier circuit, and the emitter of the transistor may be grounded.

  In the vehicle window glass of the present invention, the amplifier circuit includes: an AM amplifier circuit that amplifies an AM signal received from the antenna conductor; and an FM amplifier circuit that amplifies the FM signal received from the antenna conductor. In addition, the AM amplifier circuit and the FM amplifier circuit may be provided in parallel and connected to the current limiting circuit.

  In the vehicle window glass of the present invention, the vehicle window glass is connected between the connection terminal and the amplifying means, and has an input circuit for matching impedance, and the received signal is transmitted to the amplifying means via the input circuit. An input configuration may be used.

In the vehicle window glass of the present invention, the input circuit includes an AM input circuit and an FM input circuit, and the AM amplifier circuit receives the received signal via the AM input circuit,
The FM amplifier circuit may be configured to receive the reception signal via the FM input circuit.

  Further, the vehicle window glass of the present invention may be configured to include an output circuit that is connected between the amplifying means and the signal output terminal and that matches impedance.

  The vehicle window glass of the present invention may have a case that covers the periphery of the amplifying means, the input circuit, and the output circuit, and the case is filled with resin.

  Moreover, the vehicle window glass of this invention WHEREIN: The said signal output terminal is good also as a structure which has a cable insertion part which can be attached or detached with the communication cable connected to the said communication apparatus.

  According to the present invention, it is possible to provide a connector that is small in size and that is guaranteed to operate even at high temperatures, and a vehicle window glass equipped with the connector.

1 is a perspective view of a connector 10 of the present invention. It is AA sectional drawing of the connector 10 of this invention. FIG. 3 is a diagram for explaining an electric circuit 30 mounted on a substrate 20. 3 is a diagram illustrating an example of a current limiting circuit 80. FIG. FIG. 6 is a diagram showing a result of current limiting by a current limiting circuit 80.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the present embodiment described below, a tuner unit of an AM / FM radio, which is one of communication apparatuses mounted on a vehicle, and a glass antenna (hereinafter referred to as an antenna conductor) formed on the surface of the vehicle window glass G. This is a form in which the present invention is applied to a connector for connecting the two. The antenna conductor includes linear conductors 16a and 16b for receiving radio waves, and two quadrangular power feeding portions 15a and 15b for extracting a current excited in the antenna conductor.

  The connector of the present invention is characterized by the shape of the connector and the electric circuit built in the connector. The connector of this invention implement | achieves the connector which has durability which can respond to the temperature change of a vehicle or a window glass for vehicles by the structure which has these characteristics together.

  First, the shape of the connector of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a connector 10 according to the present invention, and FIG. 2 is a cross-sectional view taken along line AA of the connector 10 according to the present invention.

  The connector 10 includes a case 11, a cable insertion portion 12, and two connection terminals 13a and 13b. The case 11 is provided with a substrate 20 on which an electric circuit 30 described later is mounted. The cable insertion part 12 is inserted with a communication cable for connecting the tuner unit mounted in the vehicle and the connector 10. The connection terminals 13a and 13b are formed of a conductor and are fixing members for fixing the connector 10 to the vehicle window glass G. The connection terminals 13a and 13b are formed of a conductor, and are electrically connected to the two power feeding portions 15a and 15b of the antenna conductor provided on the vehicle window glass with solder or a conductive adhesive (not shown). Connected to. As a result, the connector 10 is electrically connected to the antenna conductor and fixed to the vehicle window glass G.

  In the power supply unit of this embodiment, a main element 16a that is a linear conductor is connected to one power supply unit 15a, and an adjustment element 16b that is a linear conductor is connected to the other power supply unit 15b. In FIG. 1, the connection terminal 13a is connected to the power supply part 15a to which the main element 16a is connected, and the connection terminal 13b is connected to the power supply part 15b to which the adjustment element 16b is connected by solder. Note that the connection terminal in the claims refers to the connection terminal 13a.

  The case 11 of this embodiment is formed of, for example, plastic. As shown in FIG. 2, the inside of the case 11 is sealed by filling the case 11 with a filler 14 made of resin or the like. The cable insertion part 12 has at least a signal output terminal (not shown) connected to the output terminal of the electric circuit 30 mounted on the substrate 20. In this embodiment, when a cable is inserted into the cable insertion portion 12, the output signal of the electric circuit 30 is output to the tuner unit via this signal output terminal.

  The connection terminals 13 a and 13 b of this embodiment are electrically connected to the electric circuit 30 mounted on the substrate 20 in the case 11. The connection terminals 13a and 13b are disposed so as to be in contact with the antenna conductor feeding portions 15a and 15b formed on the vehicle window glass G, and are directly fixed by soldering or the like. In the connector 10 of the present embodiment, the connection terminals 13a and 13b are fixed so as to be in contact with the feeding portions 15a and 15b of the antenna conductor, whereby the electric circuit 30 mounted on the substrate 20 and the antenna conductor are connected.

  In the present embodiment, the inside of the case 11 is filled with the filler 14 and sealed, so that the strength of the case 11 can be improved and the penetration of moisture and the like into the case 11 can be prevented. Furthermore, in this embodiment, since the resin is filled in the case 11, the flow of solder on the substrate 20 that occurs when the connection terminals 13a and 13b are fixed to the vehicle window glass G by soldering is prevented. Can do.

  Moreover, since the connector 10 of this embodiment is directly fixed to the vehicle window glass G by solder, the connector 10 can be firmly fixed to the vehicle window glass G. In addition, the connector 10 of the present embodiment does not require a holding member for fixing the connector 10 to the vehicle window glass G, a detachable member that makes the connector 10 detachable from the vehicle window glass G, or the like. For this reason, the connector 10 of this embodiment can be reduced in size compared with the conventional connector.

  Next, the electric circuit 30 mounted on the substrate 20 of this embodiment will be described with reference to FIG. FIG. 3 is a diagram showing the electric circuit 30 mounted on the substrate 20.

  The electric circuit 30 according to this embodiment includes an input circuit 32, an amplifier circuit 35, and an output circuit 95. The input circuit 32 of the present embodiment includes an AM input circuit 40 and an FM input circuit 60. The amplifier circuit 35 according to the present embodiment includes an AM amplifier circuit 50, an FM amplifier circuit 70, an auto gain control circuit 75, a current limiting circuit 80, and a power supply circuit 90.

  In the electric circuit 30 of the present embodiment, the input terminal Tin of the electric circuit 30 is connected to the antenna conductor. When an AM signal is input from the input terminal Tin, the AM signal is amplified by the AM amplifier circuit 50 via the AM input circuit 40, and from the output terminal Tout of the electric circuit 30 to the tuner unit in the vehicle via the output circuit 95. Is output. When the FM signal is input from the input terminal Tin, the FM signal is amplified by the FM amplifier circuit 70 via the FM input circuit 60, and the tuner unit in the vehicle from the output terminal Tout of the electric circuit 30 via the output circuit 95. Is output.

  The AM input circuit 40 is connected to the input terminal Tin of the electric circuit 30, and the input terminal Tin is connected to the main element 16a of the antenna conductor formed on the vehicle window glass G through the connection terminal 13a. An AM amplifier circuit 50 is connected to the subsequent stage of the AM input circuit 40. The AM input circuit 40 matches the impedance of the antenna conductor power supply unit 15 a and the main element 16 a with the impedance of the AM amplifier circuit 50. The AM amplifier circuit 50 amplifies the AM signal received from the antenna conductor and input via the AM input circuit 40.

  The FM input circuit 60 is connected to the input terminal Tin of the electric circuit 30 and is connected to the main element 16a of the antenna conductor via the connection terminal 13a. An FM amplifier circuit 70 is connected to the subsequent stage of the FM input circuit 60. The FM input circuit 60 matches the impedance of the antenna conductor feeding portion 15 a and the main element 16 a with the impedance of the FM amplifier circuit 70. The FM amplifier circuit 70 amplifies the FM signal received from the antenna conductor and input via the FM input circuit 60. The auto gain control circuit 75 controls the gain of the FM amplifier circuit 70.

  The current limiting circuit 80 limits the current flowing through the AM amplifier circuit 50 and the FM amplifier circuit 70 when the ambient temperature of the substrate 20 exceeds a predetermined temperature. Details of the current limiting circuit 80 will be described later. The power supply circuit 90 supplies power to each circuit constituting the electric circuit 30.

  The output circuit 95 is connected to the output terminal Tout of the electric circuit 30. An AM amplifier circuit 50 and an FM amplifier circuit 70 are connected to the previous stage of the output circuit 95. The output circuit 95 matches the impedance of the AM amplifier circuit 50 and the impedance of the FM amplifier circuit 70 with the impedance of the tuner unit.

  The connection terminal 13b is connected to the ground by the electric circuit 30 mounted on the substrate 20. The reception sensitivity of the antenna conductor can be adjusted by connecting the ground of the electric circuit 30 and the adjustment element 16b. If sufficient reception sensitivity is obtained, the system from the adjustment element 16b to the connection terminal 13b may not be provided.

  In the present embodiment, when the ambient temperature of the substrate 20 exceeds a predetermined temperature, the current flowing through the AM amplifier circuit 50 and the FM amplifier circuit 70 is limited, and the current flowing through the AM amplifier circuit 50 and the FM amplifier circuit 70 is reduced. By doing so, the consumption current of the electric circuit 30 is reduced, and the heat generation of the substrate 20 is suppressed.

  The current limiting circuit 80 will be described with reference to FIG. FIG. 4 is a diagram illustrating an example of the current limiting circuit 80.

  The current limiting circuit 80 includes a thermistor R10, resistors R20, R30, and R40, a transistor M10, a transistor M20, a constant voltage circuit 81, and a differential amplifier circuit 82.

  The thermistor R10 and the resistor R20 are connected in series, and constitute a voltage dividing circuit that divides the power supply voltage supplied from the power supply circuit 90. One end of the thermistor R10 is grounded, and the other end is connected to one end of the resistor R20. The other end of the resistor R20 is connected to the output terminal of the power supply circuit 90.

A connection point between the thermistor R10 and the resistor R20 is connected to the non-inverting input terminal T1 of the differential amplifier circuit 82. That is, a voltage obtained by dividing the current voltage supplied from the power supply circuit 90 by the thermistor R10 and the resistor R20 is supplied to the non-inverting input terminal T1 of the differential amplifier circuit 82.
The inverting input terminal T <b> 2 of the differential amplifier circuit 82 is connected to the output terminal of the constant voltage circuit 81. The constant voltage circuit 81 generates a predetermined constant voltage from the power supply voltage supplied from the power supply circuit 90.
That is, a constant voltage generated from the power supply voltage is supplied to the inverting input terminal T2 of the differential amplifier circuit 82.

  The output of the differential amplifier circuit 82 is supplied to the base of the transistor M10 via the resistor R30. The output of the differential amplifier circuit 82 is supplied to the base of the transistor M20 via the resistor R40.

  The output terminal of the differential amplifier circuit 82 is connected to one end of the resistor R30 and one end of the resistor R40. The other end of the resistor R30 is connected to the base of the transistor M10. The emitter of the transistor M10 is grounded, and the collector of the transistor M10 is connected to one input terminal of the AM amplifier circuit 50. The other input terminal of the AM amplifier circuit 50 is connected to the output terminal of the AM input circuit 40.

  The other end of the resistor R40 is connected to the base of the transistor M20, and the emitter of the transistor M20 is grounded. The collector of the transistor M20 is connected to one input terminal of the FM amplifier circuit 70. The other input terminal of the FM amplifier circuit 70 is connected to the output terminal of the FM input circuit 60.

  The thermistor R10 of this embodiment has a characteristic that the resistance value decreases as the ambient temperature increases. Therefore, in the current limiting circuit 80 of the present embodiment, the resistance value of the thermistor R10 decreases as the temperature of the substrate 20 rises. When the resistance value of the thermistor R10 decreases, the voltage input to the non-inverting input terminal T1 of the differential amplifier circuit 82 decreases, and the potential difference from the constant voltage input to the inverting input terminal T2 decreases. Therefore, the base potentials of the transistors M10 and M20 are lowered, and the current flowing through the AM amplifier circuit 50 and the FM amplifier circuit 70 is limited. When the current is limited, heat generation of the electric circuit 30 is suppressed.

  FIG. 5 is a diagram illustrating a result of current limiting performed by the current limiting circuit 80. FIG. 5 shows that when the ambient temperature of the thermistor R10 rises, the current is limited and the current consumption is reduced. As described above, in the present embodiment, the current limiting circuit 80 limits the current and suppresses heat generation, so that the guaranteed operating temperature range can be −40 ° C. to 115 ° C. The operation guarantee temperature range is a temperature range in which it is possible to guarantee that the circuit will not be destroyed even if the system is operated.

  Further, in the current limiting circuit 80 of this embodiment, when the ambient temperature of the thermistor R10 exceeds the upper limit of 85 ° C. of the performance guarantee temperature range, the current flowing to the AM amplifier circuit 50 and the FM amplifier circuit 70 is started. It was. The gains of the AM amplifier circuit 50 and the FM amplifier circuit 70 become smaller when the current is limited. Therefore, in this embodiment, the current limiting circuit 80 starts current limiting at the upper limit of the performance guaranteed temperature, so that the operation guaranteed temperature range can be widened.

  In the current limiting circuit 80 of the present embodiment, the thermistor R10, the constant voltage circuit 81, and the differential exacerbation circuit 82 indicate that the ambient temperature of the thermistor R10 is equal to or higher than the upper limit temperature of the guaranteed performance temperature range (85 ° C. in this embodiment). It is preferably designed such that current limiting is initiated.

  In the present embodiment, when the ambient temperature of the thermistor R10 becomes high, by restricting current and suppressing heat generation, operation at a high temperature can be guaranteed up to 115 ° C., which is higher than normal use.

  Hereinafter, the effect of suppressing heat generation according to the present embodiment will be further described.

  First, the result of measuring the temperature of the substrate 20 with the thermotracer when the substrate 20 on which the electric circuit 30 is mounted at an environmental temperature of 25 ° C. and the voltage of 13.2 V is applied for 30 minutes or more. explain. At this time, the current consumption in the electric circuit 30 is 32.5 mA.

  The highest temperature on the surface of the substrate 20 of this embodiment was 64.1 ° C., the lowest temperature was 29.9 ° C., and the average temperature was 44.7 ° C. The highest temperature on the back surface of the substrate 20 is 52.2 ° C., the lowest temperature is 29.9 ° C., and the average temperature is 42.3 ° C. The surface of the substrate 20 is a surface on which the electric circuit 30 is mounted, and the back surface is a surface opposite to the surface on which the electric circuit 30 is mounted. The size of the substrate 20 of the present invention is 29 mm × 10.6 mm.

  Next, a voltage equal to 13.2 V is applied to the substrate 20 on which the electric circuit 30 is mounted at an environmental temperature of 25 ° C. to create a state equivalent to the case where the current limiting circuit 80 operates at 115 ° C. Next, the results of measuring the temperature of the substrate 20 with a thermotracer when installed for 30 minutes or longer with the current consumption limited to 8 mA will be described.

  At this time, the highest temperature on the surface of the substrate 20 of the present embodiment was 30.7 ° C., the lowest temperature was 28.4 ° C., and the average temperature was 29.3 ° C. The highest temperature on the back surface of the substrate 20 is 31.4 ° C., the lowest temperature is 28.4 ° C., and the average temperature is 29.6 ° C.

  From the above measurement results, in this embodiment, the heat generation of the substrate 20 when the ambient temperature is high (environmental temperature 115 ° C.) is suppressed compared to the heat generation when the ambient temperature is normal (environmental temperature 25 ° C.). You can see that Therefore, in the present embodiment, the heat generation of the substrate 20 is not increased as the ambient temperature increases. Further, in the present embodiment, heat generation can be suppressed even when the elements constituting the electric circuit 30 are densely packed.

  Therefore, according to the present embodiment, it is possible to provide a connector 10 that is small in size and guaranteed to operate even at high temperatures. In addition, by mounting a connector that can cope with temperature changes, it is possible to provide a vehicle window glass that can stably receive radio waves from an antenna conductor.

  As mentioned above, although this invention has been demonstrated based on each embodiment, this invention is not limited to the requirements shown in the said embodiment. With respect to these points, the gist of the present invention can be changed without departing from the scope of the present invention, and can be appropriately determined according to the application form.

  The present invention is applicable to a connector fixed to a vehicle window glass plate.

DESCRIPTION OF SYMBOLS 10 Connector 11 Case 12 Cable insertion part 13 Fixing part 20 Board | substrate 30 Electric circuit 40 AM input circuit 50 AM amplifier circuit 60 FM input circuit 70 FM amplifier circuit 75 Auto gain control circuit 80 Current limit circuit 90 Power supply circuit 95 Output circuit

Claims (16)

A connector fixed to the vehicle window glass and connected to an antenna conductor provided on the vehicle window glass,
A connection terminal electrically connected to the antenna conductor;
Amplifying means for amplifying the received signal received by the antenna conductor sent via the connection terminal;
A signal output terminal for outputting the signal amplified by the amplification means to a communication device mounted on a vehicle,
The amplification means includes
An amplifier circuit;
A power supply circuit connected to the amplifier circuit and supplying power supply voltage;
A voltage dividing circuit that divides the power supply voltage having a thermistor reduces the current supplied to the amplifier circuit so that the current consumption decreases as the ambient temperature of the thermistor increases, and the ambient temperature of the thermistor Is a current that limits the current supplied to the amplifier circuit so that the rate at which the current supplied to the amplifier circuit is smaller than when the ambient temperature exceeds the predetermined temperature. A limiting circuit;
A connector comprising: The current limiting circuit includes a differential amplifier circuit and a transistor,
A constant voltage generated from the power supply voltage is supplied to the inverting input terminal of the differential amplifier circuit,
The power supply voltage divided by the voltage dividing circuit is supplied to the non-inverting input terminal of the differential amplifier circuit,
The output of the differential amplifier circuit is supplied to the base of the transistor,
The connector according to claim 1, wherein a collector of the transistor is connected to the amplifier circuit, and an emitter of the transistor is grounded. The amplifier circuit is
An AM amplifier circuit for amplifying an AM signal received from the antenna conductor;
An FM amplifier circuit for amplifying an FM signal received from the antenna conductor;
The connector according to claim 1, wherein the AM amplifier circuit and the FM amplifier circuit are provided in parallel and are connected to the current limiting circuit, respectively. Connected between the connection terminal and the amplification means, and having an input circuit for matching impedance;
The connector according to claim 3 , wherein the received signal is input to the amplifying means via the input circuit. The input circuit includes an AM input circuit and an FM input circuit,
The reception signal is input to the AM amplifier circuit via the AM input circuit,
The connector according to claim 4 , wherein the reception signal is input to the FM amplifier circuit via the FM input circuit. The connector according to claim 4, further comprising an output circuit connected between the amplifying means and the signal output terminal and matching impedance. The connector according to claim 6 , further comprising a case that covers a periphery of the amplification unit, the input circuit, and the output circuit, and the case is filled with resin.   The connector according to any one of claims 1 to 7, wherein the signal output terminal includes a cable insertion portion that is detachable from a communication cable connected to the communication device. In a vehicle window glass comprising an antenna conductor and a connector connected to the antenna conductor,
The connector is
A connection terminal electrically connected to the antenna conductor, an amplification means for amplifying a reception signal received by the antenna conductor sent via the connection terminal, and a signal amplified by the amplification means are mounted on a vehicle. A signal output terminal for outputting to a communication device,
The amplification means includes
An amplifier circuit;
A power supply circuit connected to the amplifier circuit and supplying power supply voltage;
A voltage dividing circuit that divides the power supply voltage having a thermistor reduces the current supplied to the amplifier circuit so that the current consumption decreases as the ambient temperature of the thermistor increases, and the ambient temperature of the thermistor Is a current that limits the current supplied to the amplifier circuit so that the rate at which the current supplied to the amplifier circuit is smaller than when the ambient temperature exceeds the predetermined temperature. A limiting circuit;
The window glass for vehicles characterized by having. The current limiting circuit includes a differential amplifier circuit and a transistor,
A constant voltage generated from the power supply voltage is supplied to the inverting input terminal of the differential amplifier circuit,
The power supply voltage divided by the voltage dividing circuit is supplied to the non-inverting input terminal of the differential amplifier circuit,
The output of the differential amplifier circuit is supplied to the base of the transistor,
The vehicle window glass according to claim 9, wherein a collector of the transistor is connected to the amplifier circuit, and an emitter of the transistor is grounded. The amplifier circuit is
An AM amplifier circuit for amplifying an AM signal received from the antenna conductor;
An FM amplifier circuit for amplifying an FM signal received from the antenna conductor;
The vehicle window glass according to claim 9 or 10, wherein the AM amplifier circuit and the FM amplifier circuit are provided in parallel and are connected to the current limiting circuit, respectively. Connected between the connection terminal and the amplification means, and having an input circuit for matching impedance;
The vehicle window glass according to claim 11 , wherein the received signal is input to the amplifying means via the input circuit. The input circuit includes an AM input circuit and an FM input circuit,
The reception signal is input to the AM amplifier circuit via the AM input circuit,
The vehicle window glass according to claim 12 , wherein the reception signal is input to the FM amplifier circuit via the FM input circuit. The vehicle window glass according to claim 12 or 13, further comprising an output circuit connected between the amplifying means and the signal output terminal and matching impedance. The vehicle window glass according to claim 14 , further comprising a case that covers a periphery of the amplifying means, the input circuit, and the output circuit, wherein the case is filled with resin.   The vehicle window glass according to any one of claims 9 to 15, wherein the signal output terminal includes a cable insertion portion that is detachable from a communication cable connected to the communication device.

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