JPH08264233A - Antenna connecting device for diversity receiver - Google Patents

Abstract

PURPOSE: To switch an antenna switching mode to an antenna fixing mode according to the potential of a detecting contact piece by connecting the detecting contact piece to a mode switching terminal of a diversity receiver. CONSTITUTION: A detecting contact piece 30 separated from a gland contact piece 24 with which a gland terminal 101 of a main antenna plug 107 and a gland terminal 103 of a subantenna plug 108 are brought into contact is arranged. When the subantenna plug 108 is inserted, the detecting contact piece 30 is electrically connected to the gland contact piece 24 through the gland terminal 103.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diversity receiver antenna connection device for connecting a main antenna and a sub antenna to a diversity receiver.

[0002]

2. Description of the Related Art Conventionally, when a tuner device is used while being moved, such as when the tuner device is mounted on an automobile, the state of radio wave blocking and reflection due to buildings and mountains changes every moment. In addition, the reception state changes every moment, and so-called multipath distortion (multipath noise) occurs because the reflected wave and the direct wave are received at the same time.

Therefore, a diversity receiver is used as a tuner device which is assumed to be used while moving like a tuner device for mounting on a car.

This diversity receiver is configured so that a plurality of antennas are connected, and an antenna having a better reception state is selected and used from the plurality of antennas.

In the television tuner device, the quality of the reception state is judged for each antenna by comparing the signals of the blanking period which are not displayed as an image among the image signals by the microcomputer.

Further, in the FM tuner device, the occurrence of multipath distortion is detected by detecting a continuous increase in noise density of, for example, 100 kHz or more, and the receiving antenna is switched. Further, the occurrence of multipath noise can also be detected by detecting the electric field strength of the received radio wave.

Conventionally, in the diversity receiver,
As shown in FIG. 8, an integrated circuit (IC) having an antenna connection circuit 42, a switching control circuit 46, and a pass / fail judgment circuit 47.
48 are used.

A main antenna 109 and a sub antenna 110 are connected to the antenna connection circuit 42. The antenna connection circuit 42 includes the antennas 109 and 1 described above.
The reception signal received by any one of 10 is sent to the tuner 43.

The tuner 43 demodulates the received signal sent and sends it to the speaker 45 via the amplifier 44.

Further, from the tuner 43, a discrimination signal for determining the quality of the reception state, for example, 100 kHz.
The signal indicating the continuous noise density and the signal indicating the electric field strength of the received radio wave are the above-mentioned pass / fail judgment circuit 47.
Sent to

The quality determination circuit 47 sends a signal indicating the determination result to the switching control circuit 46 when it is determined based on the determination signal that the multipath distortion has occurred.

The switching control circuit 46 receives the signal indicating that the multipath distortion is generated from the pass / fail judgment circuit 47, and the antenna connection circuit 42.
Control so that the signal received by the other antenna of the antennas 109 and 110 is sent to the tuner 43.

When the occurrence of the multipath distortion cannot be suppressed, the switching operation between the antennas 109 and 110 by the antenna connection circuit 41 is continuously repeated.

When the electric field strength of the received radio wave is higher than a predetermined value, the integrated circuit 48 ensures that the signal received by the sub antenna 110 is always sent to the tuner 43. Then, the antenna connection circuit 42 is controlled.

Further, when the electric field strength of the received radio wave is weaker than a predetermined value, the integrated circuit 48 has a large influence of switching noise between the antennas 109 and 110, and therefore the main antenna 109. The antenna connection circuit 42 is controlled so that the signal received by is always sent to the tuner 43.

[0016]

By the way, in the diversity receiver as described above, each antenna 1
When 09 and 110 are connected, multipath distortion may be suppressed by switching between these antennas 109 and 110, but when only the main antenna 109 is connected, switching between antennas is performed. When performing, the multipath distortion may be increased rather than suppressed.

Therefore, the mode changeover switch 114 is connected to the changeover control circuit 46. The switching control circuit 46 is configured to be switched between the switching mode and the fixed mode by the mode switching switch 114.

The switching mode is a mode for switching the antennas in the antenna connection circuit 42 when multipath distortion occurs. Further, the fixed mode is a mode in which switching of the antenna in the antenna connection circuit 42 is prohibited even when multipath distortion occurs.

The mode changeover switch 114 is connected to the mode changeover terminal of the changeover control circuit 46,
By the switching operation, the mode switching terminal is switched between a state in which it is dropped to the ground potential and a state in which it is at a constant potential (V _CC ).

By the way, the mode changeover switch 11
In No. 4, the user (user) of the tuner device switches depending on whether the sub-antenna 110 is connected or not, so that it is erroneously switched to a state that does not correspond to whether the sub-antenna 110 is connected or not. There is fear.

If the switching mode is selected even though the sub antenna 110 is not connected,
When multipath distortion occurs, the antenna switching operation is performed and good reception cannot be performed.

If the fixed mode is selected despite the sub-antenna 110 being connected, the antenna switching operation is not performed even when multipath distortion occurs, and the sub-antenna 110 is connected. It makes no sense.

Further, the mode changeover switch 114 described above.
Since it is not a switching operation in a normal use state, it is often provided at a position where it is difficult to operate, such as the rear side of the outer casing of the tuner device, and it is operated using a tool such as a driver. It may be arranged as follows.

Therefore, this mode changeover switch 11
The changeover operation of No. 4 is a complicated operation, and there is a possibility that the mode changeover switch 114 may be damaged.

Therefore, the present invention is proposed in view of the above-mentioned circumstances, and in the diversity receiver, an appropriate mode setting is performed depending on whether or not the sub-antenna is connected, and it is complicated. An object of the present invention is to provide an antenna connecting device for a diversity receiver, which can surely prevent the switching operation and the damage caused by the switching operation.

[0026]

In order to solve the above problems and achieve the above objects, an antenna connecting device for a diversity receiver according to the present invention includes a main hot contact piece to which a hot side terminal of a main antenna is connected. , A sub-hot contact piece to which the hot-side terminal of the sub-antenna is connected, a ground contact piece to which the ground-side terminal of the main antenna and the ground-side terminal of the sub-antenna are connected, and which are spaced apart from the ground contact piece. And a detection contact that comes into contact with the ground side terminal of the sub antenna when the ground side terminal of the sub antenna is connected to the ground contact piece,
This detecting contact is intended to be connected to the sub-antenna detecting means of the diversity receiver.

[0027]

In the antenna connection device for diversity receivers according to the present invention, the ground connection terminal to which the ground side terminal of the main antenna and the ground side terminal of the sub-antenna are connected is arranged separately from the ground connection piece. When the ground side terminal of the sub-antenna is connected to
Depending on whether or not the sub-antenna is connected, the ground contact is brought into a conductive state or a cut-off state and is connected to a sub-antenna detecting means of the diversity receiver, so that the sub-channel by the diversity receiver is connected. It is possible to determine whether or not the antenna is connected.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 5, an antenna connecting device for a diversity receiver according to the present invention includes upper and lower cases 1 and 2 made of a synthetic resin material and abuttingly coupled to each other, and inside the upper and lower cases 1 and 2. And a plurality of metal contact pieces that are housed and held in.

As the metal contact piece, a main hot contact piece 36 to which the hot side terminal 102 of the main antenna connection plug 107 is connected, and a sub hot side to which the hot side terminal 104 of the sub antenna connection plug 108 is connected. A contact piece 37 and a ground contact piece 24 to which the ground side terminals 101 and 103 of the connection plugs 107 and 108 are connected,
The ground side terminal 10 of the sub antenna connection plug 108
3 and a detection contact piece 30 that is in contact with 3.

Connection plug 107 of the main antenna
Is a cylindrical ground-side terminal 101, and is arranged coaxially with respect to the ground-side terminal 101 so as to be disposed inside the ground-side terminal 101 and the tip side thereof is the ground-side terminal 101.
And a columnar hot-side terminal 102 projecting forward from the tip of the.

Each of the terminals 101 and 102 is supported at the base end side by a plug base made of an insulating material. Each of these terminals 101 and 102 is shown in FIG.
As shown in FIG.
It is connected to the.

A pair of parallel cuts along the axial direction are provided on the outer peripheral surface of the ground side terminal 101 of the connection plug 107 of the main antenna, and the portion between these cuts bulges outward. By the elastic part 10
5 are provided.

The elastic portion 105 is the same as the connection plug 10 described above.
When 7 is inserted into a main jack which will be described later, it is elastically displaced in the axial direction of the connection plug 107 to press the inner wall portion of the main jack, and the connection plug 1
To prevent the 07 from falling out of the main jack.

The sub-antenna connection plug 10 is also provided.
Reference numeral 8 denotes a cylindrical ground-side terminal 103, and the ground-side terminal 103 is coaxial with the ground-side terminal 103 and is disposed in the ground-side terminal 103 so that the tip side thereof is the ground-side terminal 10.
3 has a column-shaped hot-side terminal 104 projecting forward from the tip end portion of No. 3. Each of the terminals 103 and 104 is supported at the base end side by a plug base made of an insulating material. The terminals 103 and 104 are connected to the sub antenna 110 via wires as shown in FIG.

A pair of grooves 106, 106 are provided in the circumferential direction on the outer peripheral surface of the ground side terminal 103 of the connection plug 108 of the sub antenna.

These groove portions 106, 106 are provided when the connection plug 108 is inserted into a sub jack described later.
The elastic portion provided inside the sub-jack is fitted while being elastically displaced to prevent the connection plug 108 from falling off the sub-jack.

The ground side terminal 103 of the connection plug 108 of the sub antenna 110 is formed thinner than the ground side terminal 101 of the connection plug 107 of the main antenna 109.

The main hot contact piece 36 and the ground contact piece 24 are connected to the main antenna connecting plug 107.
Constitutes the main jack to which is connected.

That is, the ground contact piece 24 has a cylindrical portion 25 having an inner diameter corresponding to the ground side terminal 101 of the connection plug 107 of the main antenna 109.
The main hot contact piece 36 is formed in a triangular tube shape having an inner diameter corresponding to the hot side terminal 102 of the connection plug 107 of the main antenna 109. Cylindrical part 25
Is disposed coaxially with the cylindrical portion 25 on the rear side of the.

When the connection plug 107 of the main antenna 109 is connected to the main jack, the ground side terminal 101 of the connection plug 107 fits into the cylindrical portion 25 of the ground contact piece 24.

At this time, the main antenna 10
The hot side terminal 102 of the connection plug 107 of No. 9 is fitted to the main hot contact piece 36.

The sub-hot contact piece 37, the ground contact piece 24 and the detection contact piece 30 constitute a sub-jack to which the connection plug 108 of the sub-antenna is connected.

That is, the ground contact piece 24 has a semi-cylindrical portion 29 having an inner diameter corresponding to the ground side terminal 103 of the connection plug 108 of the sub antenna 110.
The semi-cylindrical portion 29 is integrally connected to the cylindrical portion 25 through a flat plate-shaped portion, and the axial direction of the semi-cylindrical portion 2 is the cylindrical portion 2.
It is parallel to the 5 axis.

Further, the detection contact piece 30 has the ground side terminal 103 of the connection plug 108 of the sub antenna 110.
Has a semi-cylindrical portion 31 having an inner diameter corresponding to. The semi-cylindrical portion 31 is disposed in the upper and lower cases 1 and 2 so as to face the semi-cylindrical portion 29, and cooperates with the semi-cylindrical portion 29 to form a cylindrical portion. The detection contact piece 30 is supported in the upper and lower cases 1 and 2 in a state of being separated and insulated from the ground contact piece 24.

The sub hot contact piece 37 is formed in a triangular tube shape having an inner diameter corresponding to the hot side terminal 104 of the connection plug 108 of the sub antenna 110. The sub-hot contact piece 37 is provided in the upper and lower cases 1 and 2 on the rear side of the semi-cylindrical portion 29 of the ground contact piece 24 and the semi-cylindrical portion 31 of the detection contact piece 30, respectively. Is coaxially arranged with respect to the cylindrical portion.

The sub-antenna 11 is attached to the sub-jack.
When the connection plug 108 of 0 is connected, the ground side terminal 103 of this connection plug 108 has a semi-cylindrical portion 29 of the ground contact piece 24 and a semi-cylindrical portion 31 of the detection contact piece 30.
And fit in the cylindrical portion constituted by. At this time, the detection contact piece 30 is connected to the connection plug 108 of the sub antenna 110.
Through the ground-side terminal 103 of
4 is made conductive.

At this time, the sub-antenna 110 is also used.
The hot-side terminal 104 of the connection plug 108 is fitted into the sub-hot contact piece 37.

The semi-cylindrical portion 31 of the detection contact piece 30 is provided with a pair of parallel cuts 51, 51 along the axial direction of the cylindrical portion formed by the semi-cylindrical portion 31. The elastic portion 32 is provided by bulging the portion between the inner portions of the cylindrical portion.

The elastic portion 32 is formed by the connection plug 108.
Is inserted into the sub-jack, the semi-cylindrical portion 3
By being elastically displaced in the outward direction of the cylindrical portion constituted by 1, the connection plug 108 is fitted into the groove portion 106 provided in the ground terminal 103 of the connection plug 108 and presses the ground terminal 103. To prevent the sub-jack from falling out of the sub-jack.

Incidentally, in the ground contact piece 24, the portion forming the main jack and the portion forming the sub jack may be separated. In this case, the portion of the ground contact piece that constitutes the main jack and the portion that constitutes the subjack are connected to each other so that they are both at the ground potential on the outer side of each of the cases 1 and 2. To be done.

The upper and lower cases 1 and 2 store and hold the contact pieces 24, 30, 36 and 37 at the predetermined positions as described above.

The lower case 2 is formed in a substantially rectangular parallelepiped shape, and the first cylindrical concave portion 10 into which the lower half portion of the cylindrical portion 25 of the ground contact piece 24 is fitted on the upper surface portion. And a second cylindrical surface recess 9 into which the semi-cylindrical portion 31 of the detection contact piece 30 is fitted.

In the detection contact piece 30, the semi-cylindrical portion 31 is fitted into the second cylindrical surface-shaped concave portion 9, and the semi-cylindrical portion 3 is formed.
The pair of projecting piece portions 34 and 35 projecting from both sides of the lower case 1 are brought into contact with the upper surface portion of the lower case 2 for positioning. At this time, the positioning protrusions 18 projecting from the upper surface of the lower case 2 are fitted into the rectangular positioning holes 33 provided in one of the protrusions 34, and the detection contact piece 30 is positioned. Planned.

Further, the detection contact plate 30 has a detection terminal plate portion 39 extending laterally from the rear side portion. The detection terminal plate portion 39 has a tip end projecting outward from the lower case 2 through the first terminal plate lead-out groove 23 formed in the lower case 2.

The ground contact piece 24 has the cylindrical portion 25.
Is fitted in the first cylindrical surface-shaped recess 10 and the semi-cylindrical portion 29 is positioned on the semi-cylindrical portion 31 of the detection contact piece 30 so that the space between the cylindrical portion 25 and the semi-cylindrical portion 29 is The connecting flat plate portion is brought into contact with the upper surface portion of the positioning projection 17 provided on the upper surface of the lower case 2, and the side portion of the semi-cylindrical portion 29 is brought into contact with the upper surface portion of the positioning projection 18. Be positioned. That is, the ground contact piece 24 and the detection contact piece 30 are positioned with a distance corresponding to the height of each of the positioning protrusions 17 and 18.

At this time, the positioning pin 16 projecting from the upper surface of the lower case 2 is fitted into the circular positioning hole 27 provided in the flat plate-shaped portion of the ground contact piece 24, and the ground contact piece 24 is grounded. Positioning of the piece 24 is achieved.

As will be described later, a rectangular insertion hole 28 is formed in the flat plate portion of the ground contact piece 24 so that a restraining protrusion protruding from the lower surface of the upper case 1 can be inserted therethrough. ing.

A ground terminal plate portion 38 is provided on the ground contact piece 24 so as to extend laterally from the rear portion. The ground terminal plate portion 38 has a tip end protruding outward from the lower case 2.

On the front end edge of the flat plate-like portion of the ground contact piece 24, a screwing piece is provided so as to project and is bent at a substantially right angle. The screwing piece is inserted into a recess 11 formed in the lower case 2 by being opened to the front side and faces the front side. A screwing hole 26 is formed in this screwing piece.

The main hot contact piece 36 is fitted in the first hot contact piece positioning groove 21 formed on the rear side of the first cylindrical surface-shaped recess 10, and the cylinder of the gland contact piece 24 is fitted. It is positioned at a position on the rear side of the portion 25.

In addition, the main hot contact plate 36 is provided on the main hot terminal plate portion 4 toward the lateral side from the rear side portion.
0 is extended. This main hot terminal board part 40
Is the second terminal plate lead-out groove 2 formed in the lower case 2.
The tip side is projected to the outside of the lower case 2 through the second side.

Further, the sub-hot contact piece 37 is fitted into the second hot contact piece positioning groove 19 formed on the rear side of the second cylindrical surface concave portion 9, and the semi-cylindrical portion of the detection contact piece 30. Part 31 and semi-cylindrical part 29 of the ground contact piece 24
Is positioned at a position on the rear side of the cylindrical portion formed by.

The sub-hot contact plate 37 has a sub-hot terminal plate portion 41 extending laterally from the rear side portion. The sub-hot terminal board portion 41 has a tip side protruding outward of the lower case 2 through a third terminal board lead-out groove 20 formed in the lower case 2.

On the upper surface of the lower case 2, two welding pin portions 14 and 15 are provided so as to project.

Like the lower case 2, the upper case 1 is formed into a substantially rectangular parallelepiped shape, and the upper half of the cylindrical portion 25 of the ground contact piece 24 is fitted to the lower surface of the upper case 1. One cylindrical surface-shaped recess 6 and the second cylindrical surface-shaped recess 5 into which the semi-cylindrical part 29 of the ground contact piece 24 is fitted are formed.

The upper case 1 is composed of the above-mentioned welding pins 1
Two welding holes 3 and 4 through which 4 and 15 are correspondingly inserted are provided.

Further, the side surface of the upper case 1 is provided with a hooking portion 7 for engaging with the hooking protrusion 13 projecting from the side surface of the lower case 2.

Further, in the rear part of the upper case 1,
A hook-shaped projection 50 for engaging with the engaging groove 12 formed on the rear side portion of the lower case 2 is provided.

The upper case 1 includes the above-mentioned welding pins 1
4, 15 are inserted into the respective welding holes 3, 4 from the lower side, and the tip side portions of the respective welding pins 14, 15 are melted to be expanded in diameter, and further, the engaging hook portions 7 are the engaging protrusions. 1
3 and the hook-shaped projection 50 is engaged with the engaging groove 12 to be fixed to the lower case 2.

By fixing the upper case 1 to the lower case 2, the upper case 1 cooperates with the lower case 2 to position and hold the contact pieces 24, 30, 36, 37. That is, on the lower surface of the upper case 1, a pair of projecting piece portions 34, 35 projecting from both sides of the semi-cylindrical portion 31 of the detection contact piece 30 are pressed and supported against the lower case 2. A pair of pressing protrusions (not shown) is provided. One of the pressing protrusions is inserted into a rectangular insertion hole 28 formed in the flat plate portion of the ground contact piece 24 to press and support the protruding piece portion 35.

Further, on the lower surface portion of the upper case 1, there is provided a protruding piece portion 8 which is fitted into the terminal plate lead-out grooves 23, 22, 20 and supports the terminal plate portions 39, 40, 41. Has been done.

Further, on the side surface of each of the cases 1 and 2,
A pair of positioning pins 52, 52 are provided so as to project.

This diversity receiver antenna connecting device is a diversity receiver to which this diversity receiver antenna connecting device is applied, and each of the positioning pins 5 is placed inside the outer casing of the diversity receiver.
Positioned with respect to the printed circuit board and the like by 2, 52.

The diversity receiver antenna connection device is screwed to the outer housing of the diversity receiver by the screw holes 26.
That is, the ground contact piece 24 has the same potential as the outer casing, that is, the ground potential.

This diversity receiver is a tuner device which is assumed to be used while moving like a tuner device for mounting on a car, and selects an antenna having a better reception condition from a plurality of connected antennas. Are configured for use.

Therefore, the main antenna 109 and the sub antenna 110 are attached to the exterior portion of the vehicle body 111 of the automobile, as shown in FIG.

In the diversity receiver configured as the television tuner device, the quality of the reception state is determined for each antenna by comparing the signals of the blanking period not displayed as an image among the image signals by the microcomputer. You can

In the diversity receiver configured as the FM tuner device, the occurrence of multipath distortion is detected by detecting a continuous increase in noise density of, for example, 100 kHz or more, and the reception state of each antenna is good or bad. Can be determined. Further, the occurrence of multipath noise can also be detected by detecting the electric field strength of the received radio wave.

As shown in FIG. 6, this diversity receiver has an antenna connection circuit 42, a switching control circuit 46 which also functions as a sub-antenna detecting means, and a pass / fail judgment circuit 4.
7 and an integrated circuit (IC) 48.

The main antenna 109 and the sub antenna 110 are connected to the antenna connection circuit 42.

That is, the main hot contact plate portion 40
Are connected to the hot-side input terminal for the main antenna of the antenna connection circuit 42 by soldering or the like.
Further, the sub-hot contact plate portion 41 is connected to the hot-side input terminal for the sub-antenna of the antenna connection circuit 42,
It is connected by soldering or the like.

Further, the ground contact plate portion 38 is connected to the ground potential portion of the antenna connection circuit 42 by soldering or the like.

The antenna connection circuit 42 is controlled by the switching control circuit 46 as described later, and sends the reception signal received by either one of the antennas 109 and 110 to the tuner 43. The tuner 43
Demodulates the received signal sent, and through the amplifier 44,
It is sent to the speaker 45.

Further, from the tuner 43, a determination signal for determining the quality of the reception state, for example, 100 kHz.
The signal indicating the continuous noise density and the signal indicating the electric field strength of the received radio wave are the above-mentioned pass / fail judgment circuit 47.
Sent to

The quality determination circuit 47 sends a signal indicating the determination result to the switching control circuit 46 when it is determined based on the determination signal that the multipath distortion has occurred.

The switching control circuit 46, when the signal indicating that the multipath distortion is generated is sent from the pass / fail judgment circuit 47, the antenna connection circuit 42.
Control so that the signal received by the other antenna of the antennas 109 and 110 is sent to the tuner 43. That is, the antenna connection circuit 42 switches the antenna that sends the reception signal to the tuner 43.

When the generation of the multipath distortion cannot be suppressed, the switching operation between the antennas 109 and 110 by the antenna connection circuit 41 is continuously repeated.

When the electric field strength of the received radio wave is higher than a predetermined value, the integrated circuit 48 ensures that the signal received by the sub antenna 110 is always sent to the tuner 43. Then, the antenna connection circuit 42 is controlled.

When the electric field strength of the received radio wave is weaker than a predetermined value, the integrated circuit 48 has a large influence of the switching noise between the antennas 109 and 110, and therefore the main antenna 109. The antenna connection circuit 42 is controlled so that the signal received by is always sent to the tuner 43.

Then, the detection terminal plate portion 39 is connected to the mode switching terminal of the switching control circuit 46.

In this diversity receiver, when the antennas 109 and 110 are connected, switching between the antennas 109 and 110 is performed to suppress multipath distortion, but only the main antenna 109 is used. If the antennas are switched when not connected, the multipath distortion may be increased rather than suppressed. Therefore, the switching control circuit 46 is provided with a mode switching terminal. The switching control circuit 46 is configured to switch the operation mode between the switching mode and the fixed mode according to the potential of the mode switching terminal.

The switching mode is a mode for switching the antenna in the antenna connection circuit 42 when multipath distortion occurs. Further, the fixed mode is a mode in which switching of the antenna in the antenna connection circuit 42 is prohibited even when multipath distortion occurs.

In this diversity receiver antenna connection device, when the connection plug 108 of the sub-antenna 110 is connected to the sub-jack,
The detection contact piece 30 is connected to the ground contact piece 24 via the ground terminal 103 of the connection plug 108 to be at the ground potential. Therefore, at this time, the mode switching terminal is set to the ground potential and the switching control circuit 46 is set to the switching mode.

In this diversity receiver antenna connection device, the detection contact piece 30 is separated from the ground contact piece 24 when the connection plug 108 of the sub antenna 110 is not connected to the sub jack. As a result, a constant potential (V _CC ) is obtained. Therefore, at this time, the mode switching terminal is set to a constant potential (V _CC ) and the switching control circuit 46 is operated.
Is in fixed mode.

That is, in this diversity receiver antenna connection device, the presence or absence of the connection of the sub-antenna 110 by the diversity receiver can be determined by the potential of the detection contact piece 30. Therefore, in this diversity receiver antenna connection device, appropriate mode setting is performed according to whether or not the sub-antenna is connected in the diversity receiver.

The antenna connecting device for the diversity receiver is not limited to the above embodiment,
In the initial state, the detection contact piece 30 is brought into contact with the ground contact piece 24, and the sub antenna 11
When the connection plug 108 of No. 0 is connected to the sub jack, the detection contact piece 30 may be pressed by the connection plug 108 and separated from the ground contact piece 24.

In this case, the detection contact piece 30 is set to be electrically insulated from the connection plug 108 of the sub antenna 110.

In this case, the switching control circuit 4
6 is set to the fixed mode when the mode switching terminal is set to the ground potential, and is set to the switching mode when the mode switching terminal is set to the constant potential (V _CC ).

[0100]

As described above, in the antenna connection device for diversity receivers according to the present invention, the ground side terminal of the main antenna and the ground side terminal of the sub antenna are separated from each other. The detection contact that is provided and contacts the ground-side terminal of the sub-antenna when the ground-side terminal of the sub-antenna is connected to the ground-contact is the ground contact depending on whether or not the sub-antenna is connected. The piece is turned on or off.

Therefore, by connecting the detection contact to the sub-antenna detecting means of the diversity receiver, it is possible to determine whether or not the sub-antenna is connected by the diversity receiver.

That is, according to the present invention, in the diversity receiver, an appropriate mode setting is performed according to the presence / absence of connection of the sub-antenna, and complicated switching operation or damage caused by the switching operation occurs. It is possible to provide an antenna connection device for a diversity receiver that can reliably prevent the above.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of an antenna connection device for a diversity receiver according to the present invention.

FIG. 2 is a plan view showing an internal configuration of the antenna connecting device for the diversity receiver.

FIG. 3 is a plan view showing a configuration of the antenna connecting device for the diversity receiver.

FIG. 4 is a bottom view showing the internal configuration of the antenna connecting device for the diversity receiver.

FIG. 5 is a front view showing the configuration of the antenna connection device for the diversity receiver.

FIG. 6 is a block section showing a configuration of the diversity receiver.

FIG. 7 is a perspective view showing a configuration of a main antenna and a sub antenna attached to an outer wall portion of a vehicle body of an automobile.

FIG. 8 is a block section showing a configuration of a conventional diversity receiver.

[Explanation of symbols]

 24 ground contact piece 30 detection contact piece 36 main hot contact piece 37 sub hot contact piece 46 switching control circuit 102 hot side terminal 104 hot side terminal 109 main antenna 110 sub antenna

Claims (1)

[Claims] 1. A main hot contact piece to which a hot side terminal of a main antenna is connected, a sub hot contact piece to which a hot side terminal of a sub antenna is connected, a ground side terminal of the main antenna and a ground side of the sub antenna. The ground contact to which the terminal is connected and the ground contact that are spaced apart from the ground contact, and when the ground-side terminal of the sub-antenna is connected to this ground contact, the ground-side terminal of this sub-antenna And a detection armature for contacting the antenna, the detection armature being connected to the sub-antenna detecting means of the diversity receiver.