JPH10189163A - Interface unit for coaxial cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interface unit capable of utilizing signals from both an input terminal and an output terminal while keeping the frequency band and transmission mode of a coaxial cable as they are by forming at least two signal introducing terminals and at least tow connecting terminals for exchanging signals with an external apparatus as major structural portions. SOLUTION: This interface unit is provided with inner conductors of two signal introducing terminals 1-1, 1-2 and inner conductors of two connecting terminals 2-1, 2-2 connected to the signal introducing terminals 1-1, 1-2. The inner conductors of the connecting terminals 2-1, 2-2 are constituted of moving tongue pieces 3-1, 3-2 and a fixed conductive plate 4 respectively. The high-frequency signal fed from the signal introducing terminal 1-1 is transmitted in the order of the moving tongue piece 3-1 → conductive plate 4 → moving tongue piece 3-2 → signals introducing terminal 1-2. The high-frequency signal fed from the signal introducing terminal 1-2 is transmitted in the opposite order to the above and is fed to the signal introducing terminal 1-1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[Object of the invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interface unit for a signal transmission system using a coaxial cable, and more particularly to a signal transmission system using a coaxial cable installed in a general house, apartment house, office, or the like. The present invention relates to an interface unit for incorporating a high-frequency signal into a device or supplying a signal to a signal transmission system.

[0002]

2. Description of the Related Art Conventionally, as an interface unit for guiding a high-frequency signal from a signal transmission system using a coaxial cable to an electronic device, a series unit for a TV signal, which is frequently used in a TV common reception facility in a common house, is typical. It is something. The system and equipment will be described.

FIG. 12 shows an outline of a conventional TV common reception facility in a common house using a large number of TV signal series units. In FIG. 12, 21-
Reference numerals 1, 21-2, 21-3, and 21-4 denote antenna groups for receiving a TV signal. Reference numerals 21-1 and 21-2 denote SHF band parabolic antennas for BS and CS reception, 21-3 denotes a VHF band terrestrial wave reception antenna, and 21-4 denotes a UHF band terrestrial wave reception antenna. Is shown.

[0004] Each TV signal received by these antenna groups is divided into coaxial cables 24-1, 24-2, 24-3,
It is introduced into the mixer 22-1 via 4-4. here,
The output of the mixer 2-1 is guided to the input of the amplifier 3 by a coaxial cable to a predetermined output level, and then enters the input of the distributor 22-2. The splitter 22-2 shows an example of a four splitter. Here, the TV signal divided into four is output from the output of the splitter 22-2 from the output of the splitter 22-2 to coaxial cables 25, 26, each of which has serial units connected in multiple stages. 27-1, 28, and serial units 25-1, 25-2,.
6-2, ... 27-1, 27-2, ... 28-1, 28-
Are distributed to each TV viewer through the branch terminals of 2,. Here, since the antenna, the mixer, the amplifier, and the distributor are integrated with each other, they have the characteristics of a terminal station, and are generally called a head end.

[0005] The features of such a conventional TV joint reception system are as follows. The headend is centralized in one place on the system.

[0006] 2. The flow of the TV signal is a one-way flow from the head end to the line down direction.

[0007] 3. Signals from the subscriber side are not transmitted directly to other subscribers without going through the headend.

[0008] 4. The input / output and branch terminals of the series unit
Since it is incorporated together with the circuit in the same housing, it is difficult to change the circuit and use it for purposes other than TV signals.

[0009] 5. Since the frequency band to be used is determined in advance, when the frequency needs to be expanded at a later date, the entire device must be replaced.

That is.

Here, a conventional serial unit which is an interface unit will be described. This is a device that electrically uses a directional coupler, and a part of a high-frequency signal input from an input terminal is a branch terminal. , And the rest is transmitted as it is to the output side, but a high frequency signal entering from the output terminal side is transmitted to the input side but is not coupled to the branch terminal, that is, a so-called hybrid circuit.

The reason for this configuration is that consideration has been given to prevent noise generated from a TV on the downstream side of the serial unit from flowing in. The frequency band that can be normally used is about 10 to 860 MHz.

FIG. 13 shows an outline of the structure of the serial unit. In FIG. 13, reference numeral 31 denotes an input terminal.
A terminal insulated from the metal cover 34 and connected to the inner conductor of the coaxial cable to serve to guide a high-frequency signal into the housing. The outer conductor of the input side cable is the terminal 31
It is structured to be grounded to the housing by the metal fitting 35 on the lower side. Similarly, the output terminal is in a hidden position in FIG. 13, but is attached to the side of the housing opposite to the terminal 31 in the same manner as the terminal 31.

The branch terminal 32 is taken out from the surface of the mounting bracket 33 by a connector with its internal conductor insulated. The mounting bracket is wired by embedding this series unit in a wall of a living room of a house, for example. In this case, the branch terminal is installed so as to be exposed from the wall surface into the living room.
In addition, a hole 37 for attaching a decorative board is generally provided on the front of the branch terminal for aesthetic reasons.

[0015]

As described above, since the frequency of a conventional series unit is about 10 to 860 MHz, the 2500 MHz band used in a wireless local area network, which is expected to spread in the future, and the like.
In the case of mobile phone frequency, transmission of CS broadcast IF signals, etc., and the lower frequency, video tape recorders and baseband signal frequencies of surveillance cameras are not satisfactory in terms of performance when trying to use conventional serial units. Often.

Further, since a signal from the downstream side of the serial unit cannot be directly transmitted to the branch terminal, if a signal from the downstream side is to be transmitted to each branch terminal, the signal is once transmitted to the head end. After that, it must be transmitted again to the down line and taken out from the branch terminal.
This means that if the same frequency band as the uplink is already present in the downlink, it is necessary to convert the frequency of the uplink at the head end so that it does not overlap with the existing downlink. Frequency conversion equipment is required.

Further, in the conventional system, the equipment for transmitting a signal must be installed at a location where the head end is located. For example, when the head end is placed near an antenna installed on a rooftop, There is a disadvantage that the signal of the cable TV coming in from the outside has to be laid separately by a coaxial cable and once transmitted to the roof having the headend.

The present invention has been made in consideration of the above points, and has been made into a unit in which the frequency band and transmission form of a coaxial cable are maintained as they are, and a function providing device (hereinafter, referred to as an adapter) suitable for the purpose of use. ), The transmission band is very wide, the signal from the input terminal side and the signal flowing from the output terminal side can be used, and the insertion point of the signal can be set at an arbitrary position on the line. An object of the present invention is to provide an interface unit suitable for constructing a transmission facility.

It is another object of the present invention to provide an interface unit which can cope with a system expansion, replacement, or change of purpose simply by adding or changing an added adapter, and which can be repaired economically in a short time. . [Configuration of the invention]

[0020]

In order to achieve the above object, according to the present invention, at least two signal introduction terminals to which a coaxial cable is connected and at least two signal introduction terminals for transmitting and receiving signals to and from an external device. Two connection terminals, and a member insertion portion that is disposed at each of the connection terminals and that can insert a connection pin when required, and is disposed between the two signal introduction terminals while always in contact with each of the signal introduction terminals. 3. An interface unit for a coaxial cable, comprising: an intermediate connection member, a conductor portion and an insulator portion, and an element constituting the coupling pin inserted into a member insertion portion of the intermediate connection member. The member insertion portion of the intermediate connection member in the coaxial cable interface unit according to claim 1, wherein the member insertion portion receives at least the coupling pin therebetween. One coaxial cable interface unit having a tongue which is movable, according to claim 3,
The coupling pin in the interface unit for a coaxial cable according to claim 1 or 2, wherein a conductor and an insulator are laminated, and an external device is connected to the tongue piece while separating one and the other of the tongue piece. The coaxial cable interface unit according to claim 4, wherein the two coaxial cables are connected in opposite directions to each other, and each of the coaxial cables is connected to the signal introducing terminal, and the coaxial cable is configured to be freely expandable and contractable in the linear direction. A movable tongue disposed between the two signal introduction terminals on the straight line and always in contact with each of the signal introduction terminals, and between the two signal introduction terminals and the movable tongue. And two components for transmitting and receiving signals to and from an external device, and an element having a conductor portion and an insulator portion and constituting a coupling pin inserted into the coupling terminal. In the obtained coaxial cable interface unit, the distance between the coupling terminals in the coaxial cable interface unit according to claim 5 is more than half of an upper limit frequency of a frequency band that can pass between the two signal introduction terminals. 7. The coaxial cable interface unit according to claim 6, wherein the electrical length is set to approximately one-quarter of the wavelength at a high arbitrary frequency.
6. The coupling pin inserted into the coupling terminal in the interface unit according to any one of (5) to (5),
8. An interface unit having a layered structure, and claim 7.
The coupling pin inserted into the coupling terminal in the interface unit according to any one of claims 1 to 5 provides an interface unit having a three-layer structure including a conductor, an insulator, and a conductor.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION At an appropriate position on a coaxial cable line, a plurality of interface units using at least two signal introducing terminals, that is, signal introducing connectors as input and output are connected. The characteristic impedance between the signal introduction connectors is made equal to the characteristic impedance of the coaxial cable, and the signal introduction connectors are connected to each other by an intermediate connection member that can be electrically disconnected. Further, the interface unit is provided with a coupling terminal, that is, a coupling connector for connecting to an external device, and a coupling pin, that is, an electric circuit (adapter) is attached to the coupling connector.

As a result, the conductor connecting the signal introducing connectors is cut off, and the signal from each signal introducing connector passes through the coupling connector and the adapter, and the interface unit for various uses depends on the function of the adapter. become.

FIG. 9 shows the outline of the mechanism of the interface unit according to the present invention. As shown in FIG. 9A, two signal introduction terminals 1-1 and 1-2 are provided, and these signal introduction terminals are respectively provided. Two connected connection terminals 2-1 and 2-2
And That is, usually, the signal introduction terminal 1-
The high-frequency signal supplied from 1 enters the movable tongue 3-1 having conductivity, passes through the conductive plate 4 and the movable tongue 3-2 in contact therewith, and is transmitted to the signal introduction terminal 1-2. You.

The high-frequency signal supplied from the signal introducing terminal 1-2 enters the movable tongue 3-2, then passes through the conductive plate 4 in contact therewith, and passes through the movable tongue 3-1. The signal is transmitted to the introduction terminal 1-1.

The combination of the movable tongue 3-1 and the conductive plate 4 and the combination of the movable tongue 3-2 and the conductive plate 4 constitute inner conductors of the coupling terminals 2-1 and 2-2. ,
When the connecting pin 5 is inserted from the outside during this time, the movable tongue piece 3-1 is pushed to the left on the plane of the drawing and is separated from the conductive plate 4 because of the springy metal. Therefore, the signal introduction terminal 1-
The high-frequency signal supplied from 1 enters the movable tongue piece 3-1.
The signal is supplied to the coupling pin 5-1 inserted into the coupling terminal 2-1.
Is transmitted to

The high-frequency signal supplied from the signal introduction terminal 1-2 is pushed to the right side of the paper and separated from the conductive plate 4 because the movable tongue piece 3-2 is made of metal having the same spring property. It enters the piece 3-2 and is transmitted to the coupling pin 5-2 through the coupling terminal 2-2 as it is. At this time, it is necessary to use a pin having a two-layer structure made of an electrically conductive material on the movable tongue side and an insulator on the conductive plate side.

FIG. 9 (b) shows a similar concept. As shown in FIG. 9 (b), two terminals 1-1 and 1-2 as signal introduction terminals and respective signals are provided. FIG. 9 (a) is similar to FIG. 9 (a) in that two coupling terminals 2-1 and 2-2 for coupling a signal to an external terminal are provided. The difference is that they do not double.

That is, the movable tongue piece 3-1 and the movable tongue piece 3-2 are normally configured to be pushed down from above the paper toward the signal introduction terminals 1-1 and 1-2 due to their spring properties. , The signal introduction terminals 1-1 and 1-2 are connected. Therefore, normally, the high-frequency signal supplied from the signal introduction terminal 1-1 is a movable tongue piece 3-1 having conductivity.
And transmitted to the signal introducing terminal 1-2 through the movable tongue piece 3-2 through the conductive plate 4 in contact therewith.

The high-frequency signal supplied from the signal introduction terminal 1-2 enters the movable tongue 3-2, passes through the conductive plate 4 in contact therewith, passes through the movable tongue 3-1 and enters the signal introduction terminal. 1-1 is transmitted.

When the coupling pin 5 is inserted from the outside, the movable tongue 3-1 is pushed upward in the plane of the drawing and is separated from the signal introducing terminal 1-1 because the movable tongue 3-1 is a metal having a spring property.
The high-frequency signal supplied from the signal introduction terminal 1-1 is on the conductor side of the coupling pin 5-1 and the high-frequency signal supplied from the signal introduction terminal 1-2 is such that the movable tongue 3-2 has the same spring property. Since it is made of metal, it is pushed above the paper and separates from the signal introduction terminal 1-2, so that it enters the conductor of the signal introduction pin 5-2 and is transmitted to the outside through the coupling terminal 2-2 as it is.

The coupling pins 5 inserted at this time are made of an insulating material on one side of the movable tongue, and a conductive material on the signal introducing terminal side.
Although a pin having a layered structure is used, the insulator side needs to be long in any case.

FIGS. 9 (a) and 9 (b) show the structures of the inserted pins, respectively. If the distance from the coupling terminal to the signal introduction terminal is long, the conductor-insulator 2 Instead of a layer structure, a three-layer structure of a conductor-insulator-conductor as shown in FIG. 9B and a so-called strip-line structure transmission pin coupling pin is used to transmit a part of the line to the outside of the unit. Can be made equal to the characteristic impedance of the cable to improve the characteristics and prevent reflection.

It is also possible to move the movable tongue by means other than the connecting pin, for example, a push button or a magnetic force, and to connect a separate coaxial cable to the signal introducing terminal for the connecting line. Here, an adapter having such coupling pins and added to the interface unit of the present invention will be described.

Although the adapter has different circuit contents depending on its purpose, when the adapter is attached to the interface unit of the present invention, a coupling pin coming out of the adapter enters the interface unit to introduce a signal, and
In that case, the interface unit of the present invention is required to have a function of requesting that the connection between the signal introduction terminals by the movable tongues be separated from each other in the adapter.

FIG. 10 shows an example of the adapter.
As a circuit configuration, two directional couplers 7-1 and 7-2 are combined, and two branch terminals 6-1 and 6-2 connected to the directional couplers 7-1 and 7-2 are connected. In this case, the connecting pin 5 enters the unit by fitting the adapter to the interface unit, and the movable tongue pieces 3-1 and 3 in the interface of the present invention shown in FIG. Press -2 to expand.

At this time, signals from the signal introduction terminals 1-1 and 1-2 are transmitted to the directional coupler in the adapter. That is, the high-frequency signal supplied from the coupling pin 5-1 enters the directional coupler 7-1, and a part of the signal is coupled to the branch terminal 6-1 of the directional coupler 7-1, and the rest is supplied to the directional coupler 7-1. The signal is transmitted to the coupling pin 5-2 through the sex coupler 7-2. However, even if the high-frequency signal entering from the coupling pin 5-1 enters the directional coupler 7-2,
The directional coupler is not coupled to the -2 branch terminal 6-2.

The high-frequency signal supplied from the coupling pin 5-2 enters the directional coupler 7-2, a part of which is coupled to the branch terminal 6-2, and the rest is transmitted to the coupling pin 5-1 as it is. However, it is hardly coupled to the branch terminal 6-1 of the directional coupler 7-1. That is, the circuit configuration of this adapter is such that two directional couplers are back to back. As an example, an adapter having such a circuit configuration is added to the interface unit of the present invention.

[0038]

The operation of the interface unit according to the present invention will be described with reference to FIG. 11 in the case where the above-mentioned adapter is added and used as equipment of a TV common reception facility. FIG. 11 shows a basic T configured using the interface unit of the present invention.
This is a V-sharing system, and includes adapters 1 ', 2', 3 ', and 4' shown in FIG. 10 as interface units. In FIG. 11, each adapter is referred to as an upstream branch terminal in FIG. 11 and an UST branch terminal for short. Also, the branch terminal on the lower side of the paper is referred to as a downstream branch terminal, and is abbreviated as a DST branch terminal.

Then, the terminal (1-1) of the interface unit of FIG. 9 connected to the coupling pin which is sequentially coupled to the UST branch terminal is connected to the USP signal introduction terminal and the interface unit of FIG. Terminal (1-2) is referred to as a DSP signal introduction terminal for convenience. Then, on the track, the USP signal introduction terminal is always connected to the DSP signal introduction terminal of the next connected unit. Hereinafter, such a connection order is repeated until a predetermined number of interface units are connected.

The following equipment is connected to the interface unit of the present invention used in the TV co-listening system shown in FIG. That is, in FIG. 11, the antenna 15-1 is connected to the DST branch terminal of the adapter 1 '.
VHF, U received at 15-2, 15-3, 15-4
The HF and SHF television waves are mixed by the mixer 16,
The signal is set at a required level by the amplifier 17 and supplied. This signal is transmitted to the interface units 18-1 and 18-.
2, 18-3, and 18-4, enter the USP signal introduction terminal of the interface unit 18-4, and enter the other DS.
It is terminated by being absorbed by the absorption resistor Ra connected to the P signal introduction terminal. Meanwhile, these signals can be taken out as branch outputs from the UST branch terminals of the adapters 18-1, 18-2, and 18-3.

The high-frequency signal from the VTR supplied to the UST branch terminal of the adapter 18-4 passes through the interface units 18-3 and 18-2 and enters the DSP signal introduction terminal of the interface unit 18-1. Is terminated by being absorbed by the absorption resistor Ra connected to the USP signal introduction terminal. In the meantime, this signal can be taken out as a branch output from the DST branch terminals of the adapters 18-2 and 18-3.

As described above, in the interface unit of the present invention, a plurality of interface units are sequentially connected in advance in the middle of a transmission line using a coaxial cable, and an adapter for a specific purpose is added. It becomes an interface unit for supplying a high-frequency signal from a signal source to a line, and another interface unit is used to branch and output a signal from the line. There is no need to fix the so-called head end at one place, and power may be supplied to any position of the interface unit in the line, and two types of lines, an up (US) line and a down (DS) line, are connected to the same cable. Since a line can be provided, a broadband coaxial line can be economically constructed.

In the above example, the TV signal and the VTR signal have been described. However, the signals are not limited to these signals, but may include a high-frequency signal for remotely controlling a device, an intermediate frequency of two different CS broadcasts, Intercom, remote monitoring,
Needless to say, a high frequency signal from a telephone or the like can be superimposed and used.

[0044]

【Example】

(Embodiment 1) FIG. 1 shows an embodiment of the interface unit of the present invention. FIG. 1A is a perspective view showing the appearance, FIG. 1B is an explanatory view of the internal structure, and FIG. 1C is a view showing electrical elements.

The main part of the structure of the first embodiment is shown in FIG.
As shown in (c), an inner conductor of two signal introduction terminals 1-1 and 1-2 and an inner conductor of two coupling terminals 2-1 and 2-2 connected to each signal introduction terminal are provided. Is to be. And the inner conductors of the coupling terminals 2-1 and 2-2 are
Each of the movable tongues 3-1 and 3-2 and the fixed conductive plate 4. As shown in FIG. 1, the operation is such that the high-frequency signal supplied from the signal introduction terminal 1-1 enters the movable tongue piece 3-1 having conductivity, and the conductive tongue piece 3-1 is in contact with the movable tongue piece 3-1. The signal is transmitted to the signal introducing terminal 1-2 through the plate 4 and the movable tongue piece 3-2.

The high-frequency signal supplied from the signal introducing terminal 1-2 enters the movable tongue 3-2, passes through the conductive plate 4 in contact therewith, passes through the movable tongue 3-1 and passes through the signal introducing terminal. 1-1 is transmitted.

In the first embodiment, a coupling pin made of an insulator and a conductor is inserted between the inner conductors of the coupling terminals to transmit signals from the signal introduction terminals 1-1 and 1-2 to the outside of the unit. Is done. In a state where the coupling pin is inserted, the high-frequency signal supplied from the signal introduction terminal 1-1 is extracted to the outside through the conductor side of the coupling pin, and the signal introduction terminal 1
-2 is transmitted to the outside through the conductor side of the coupling pin. The coupling pins used have a two-layer structure of conductor-insulator and insulator-conductor, respectively.
At this time, the direct connection between the signal introduction terminals 1-1 and 1-2 through the conductive plate 4 and the movable tongue pieces 3-1 and 3-2 is cut off because the insulator of the coupling pin intervenes. .

The interface unit of the present invention having such a configuration has the appearance structure shown in FIG. That is, in FIG. 1A, the signal introduction terminals 1-1, 1-
Reference numeral 2 denotes a terminal insulated from the metal housing 10, which is connected to the inner conductor of the coaxial cable and serves to guide a high-frequency signal into the housing. The outer conductor of the coaxial cable is structured to be grounded to the housing by shells 6-1 and 6-2 surrounding the terminal 1-1 coaxially. Coupling terminals 2-1 and 2-
Numeral 2 is a connector in which the inner conductor is insulated on the surface of the housing 10. The mounting bracket 7 is configured so that the interface unit can be easily installed in a wall in a room. For example, a screw hole having a predetermined size for mounting to an electric wire box, and protection of a portion exposed to the room. A hole for attaching a decorative board is provided on the surface of the connection terminal to prevent dust and dust.

In FIG. 1A, a mounting bracket 7 is a stainless steel plate having a thickness of 1.0 mm and a width of about 20 mm, and a zinc die-cast housing 10 is mounted on the front surface thereof, and a connector serving as a coupling terminal is provided. The material of the movable tongues 3-1 and 3-2 inside 2-1 and 2-2 is made of beryllium copper spring material cut to a width of 2 mm and a length of about 4 mm. Molded integrally with the body 10,
Its outer diameter is formed to be about 10 mm. Movable tongue piece 3-
1, 3-2 are omitted in the illustrated example in which the shell is fixed using a sleeve made of an appropriate insulator.

(Embodiment 2) FIG. 2 shows another embodiment of the interface unit of the present invention. The second embodiment differs from the first embodiment in that the coupling terminal has a single shell.
2 (a) is a perspective view showing the appearance, FIG. 2 (b) is an explanatory view of the internal structure, and FIG. 2 (c) is a view showing electrical elements.

As shown in FIG. 2A, the inner conductors of the two signal introduction terminals 1-1 and 1-2 on the left and right sides of the paper are portions into which the inner conductors of the coaxial cable are inserted. The outer conductor of the cable is a shell 6 coaxially surrounding the terminals 1-1 and 1-2.
-1, 6-2, and has a structure integrally formed with the housing 10. In FIG. 2C, the inner conductors of the coupling terminals 2-1 and 2-2 are movable tongue pieces 3-1 and 3-2, which are parts made of a spring material, and whose outer conductors are It is formed integrally with the housing 10.

In the state shown in FIG. 2, the movable tongue piece 3-1,
3-2 is in contact with each other near the tip. The inner conductors of the signal introduction terminals 1-1 and 1-2 are connected to the movable tongues 3-1 and 3-2, respectively. Further, the second embodiment has a structure in which the conductive plate used in the first embodiment is not required. In this state, the interface unit outputs the high-frequency signal supplied from the signal introduction terminal 1-1 to the movable tongue 3-1 and passes the signal through the movable tongue 3-1 and the movable tongue 3-2. The signal is transmitted to the introduction terminal 1-2.

The high-frequency signal supplied from the signal introduction terminal 1-2 enters the movable tongue 3-2 and is transmitted to the signal introduction terminal 1-1 through the movable tongue 3-1 in contact therewith. You.

Further, in the second embodiment, the use of the connecting pin for transmitting and receiving signals to and from the outside of the unit is the same as in the other embodiments, but the movable tongue pieces 3-1 and 3-2 are used.
The coupling pin 5 inserted therebetween is a conductor-insulator-conductor 3
Use a layered structure.

FIG. 3 shows this state. That is, the inner conductors of the introduction cables 1 and 1 'are inserted into the signal introduction terminals 1-1 and 1-2, respectively, and the movable tongue pieces 3-1 and 3-2 are inserted.
A coupling pin 5 having a three-layer structure of a conductor, an insulator, and a conductor is inserted between them. The coupling pin 5 has a three-layer structure of a conductor (5-1), an insulator (5-0), and a conductor (5-2). Reference numeral 2 denotes an outer conductor surrounding the coupling pin 5 coming out of the adapter added to the outside.

When the coupling pin 5 is introduced, the high-frequency signal supplied from the signal introduction terminal 1-1 is extracted to the outside through the conductor on the left side of the coupling pin 5 and supplied from the signal introduction terminal 1-2. The high-frequency signal is transmitted to the outside through the conductor on the right side of the coupling pin 5. At this time, the direct connection between the signal introduction terminals 1-1 and 1-2 is interrupted due to the presence of the insulator of the coupling pin 5.

The inner conductors of the signal introduction terminals 1-1 and 1-2 and the movable tongue pieces 3-1 and 3-2 are made of beryllium copper spring material, and have a width of 2 mm and a length of about 5 mm. It is fixed in the shell using a sleeve made of a suitable insulator, but is omitted in FIG. The shell of each connector is formed integrally with the housing 10 and has an outer diameter of about 10 mm. The interface unit of the present invention having such a configuration has the appearance structure shown in FIG.

(Embodiment 3) FIG. 4 shows another embodiment of the present invention. FIG. 4A is a perspective view showing the appearance, and FIG. 4B is an explanatory view of the internal structure. Example 3
The main configuration of the coaxial system is substantially the same as the configuration of FIG. 1 shown in the first embodiment, and an interface unit for a telephone line composed of two parallel lines is additionally provided.
Therefore, in the third embodiment, in addition to the coaxial signal, the signal flowing through the parallel line can be directly extracted to the front surface of the interface unit. Here, the reference numerals and operations of the coaxial system are the same as those of the first embodiment, and the description is omitted.

In FIG. 4A, the mounting bracket 7 is a stainless steel plate having a thickness of 1.0 mm and a width of about 42 mm, and a housing 10 is mounted on the front surface thereof. Connectors 12-1 and 12 serving as terminals
The outer conductor of the connector is integrally formed with the housing 10.

FIGS. 4A and 4B show components connected to the signal introduction terminals 11-1 and 11-2 for parallel lines. And the movable tongue piece 13 for parallel lines
Reference numerals -1 and 13-2 each include two coaxial movable tongues each having the same structure, and the conductive plates 14-1 and 14-1 for parallel lines.
4-2 is also provided. These movable tongue pieces 13-1, 13
-2 and the conductive plates 14-1 and 14-2 are all fixed in the shell of the coupling terminal for parallel wires using a sleeve made of an appropriate insulator.

As shown in FIG. 4B, the low-frequency signal supplied from the signal introduction terminal 11-1 enters the movable tongue 13-1 having conductivity, and the signal is transmitted to the movable tongue 13
1 through the conductive plate 14-1 in contact with the movable tongue 1
The signal is transmitted to the signal introduction terminal 11-2 through 3-2.

The low-frequency signal supplied from the signal introduction terminal 11-2 enters the movable tongue 13-2, passes through the conductive plate 14-2 in contact therewith, and passes through the movable tongue 3-1. , To the signal introduction terminal 11-1. Also in the third embodiment, the coupling pins made of an insulator and a conductor are provided between the inner conductors of the coupling terminals by the signal introduction terminals 11-1 and 11-2.
To transmit the signal from the outside of the unit.

When the coupling pin 5 is inserted, the low-frequency signal supplied from the signal introducing terminal 11-1 is drawn out through the conductor side of the coupling pin 5 and supplied from the signal introducing terminal 11-2. The low frequency signal is transmitted to the outside through the conductor side of the coupling pin 5. The coupling pins used have a two-layer structure of conductor-insulator and insulator-conductor, respectively. At this time, the direct connection between the signal introduction terminals 11-1 and 11-2 and the conductive plates 14-1 and 14-2 through the movable tongue pieces is cut off because the insulator of the coupling pin 5 intervenes.

(Embodiment 4) FIG. 5 is a cross-sectional view showing the internal structure of still another embodiment of the present invention. As shown in FIG. 5, the inner conductors of the two signal introduction terminals 1-1 and 1-2 arranged on the left and right sides of the drawing are portions into which the inner conductors of the coaxial cable are inserted. Then, the signal introduction terminal 1-
The inner conductors 1 and 1-2 have a head and a tail into which the inner conductor of the cable is inserted, and they are integrally made of a spring material. The outer conductor of the signal introduction terminal is the signal introduction terminal 1
6-1 and 6-2 coaxially surrounding -1 and 1-2
And is formed integrally with the housing 10. In the fourth embodiment, the inner conductor of the coupling terminal is connected to the signal introduction terminal 1-.
The outer conductors of the coupling terminals 5 are also integrally formed with the housing 10.

In this case, the movable tongues 3-1 and 3-2 also serve the role of the conductive plate, unlike the conductive plate of the above embodiment. The movable tongue piece 3-2 has a pipe shape and is fitted around the outer circumference of the other movable tongue piece 3-1 such that its inner diameter is in contact with the outer diameter of 3-1. Has a spring and is connected to the rod-shaped movable tongue piece 3-1 to push both movable tongue pieces to the left and right.

In the fourth embodiment shown in FIG. 5, the coupling pin 5 used for transmitting a signal outside the unit is used.
Have a two-layer structure of a conductor-insulator and an insulator-conductor. In a state where the coupling pin 5 is not inserted, the movable tongue pieces 3-1 and 3-2 and the respective tails of the inner conductors of the signal introduction terminals 1-1 and 1-2 are in contact with each other due to the extension force of the spring. The insulator 8 is for holding these members, that is, a built-in movable tongue piece, at the center of the housing 10. In this state, the high-frequency signal supplied from the signal introduction terminal 1-1 passes through the movable tongue 3-1 and moves to the movable tongue 3-2.
And transmitted to the signal introduction terminal 1-2. The high-frequency signal supplied from the signal introduction terminal 1-2 passes through the movable tongue piece 3-1 in contact with the high-frequency signal, and the signal introduction terminal 1-1.
Is transmitted to

Then, with the coupling pin inserted,
The high-frequency signal supplied from the signal introduction terminal 1-1 is extracted to the outside through the conductor side of the coupling pin, and the high-frequency signal supplied from the signal introduction terminal 1-2 is transmitted to the outside also through the conductor side of the coupling pin. . At this time, the direct connection between the signal introduction terminals 1-1 and 1-2 through the movable tongue is cut off because the insulator of the coupling pin is interposed therebetween.

The material of the inner conductor of the signal introduction terminals 1-1 and 1-2 uses a spring material made of beryllium copper and has a width of 2 mm.
The length of the connector is about 10 mm, and the shell of each connector is formed integrally with the housing 10 to have an outer diameter of about 10 mm.

In the case of the structure of the fourth embodiment, when the coupling pin is not inserted, the inner conductor between the signal introduction terminals is straight, unlike the case of the first embodiment, so that the coaxial state can be easily maintained. An interface unit with good impedance can be realized.

(Embodiment 5) FIG. 6 shows the structure of another embodiment of the present invention in which the distance between the coupling terminals is different. The basic structure of this embodiment is the same as that of Embodiment 1 shown in FIG. Is the same. In FIG. 6, in order to clarify the interval between the coupling terminals, the position is again shown with the position aa 'in FIG. And FIG.
FIG. 7 shows a return loss versus frequency characteristic measured from the signal introduction terminal 1-1 by connecting a terminal resistance equal to the characteristic impedance to the signal introduction terminal 1-2 in the first embodiment shown in FIG. At this time, the distance between the inner conductors of the coupling terminal shown in FIG.
That is, the distance between aa ′ in FIG. 6 is 20 mm. As is clear from FIG. 7, the return loss characteristic of the first embodiment gradually deteriorates as the frequency increases from 1,400 MHz, and becomes about 10 dB at 3,000 MHz.

The reason for this is that the inductance of the inner conductor of the coupling terminal, that is, the inductance of the movable tongue 3-1 and the fixed conductive plate 4 and the inductance of the movable tongue 3-2 and the fixed conductive plate 4 are the signal introduction terminals. 1-1 and 1-2 are connected in series, and the shells 8-1 and 8-2 and the movable tongue piece 3-
Each of the capacitances at the tip portions of 1, 3-2 is the signal introduction terminal 1-.
It is considered that the vehicle enters the line between 1, 1 and 2 in parallel.

In the fifth embodiment, in order to reduce the influence of the floating reactance, the coupling terminals 2-1 and 2-2
, I.e., the distance between aa 'in FIG.
One quarter of the wavelength of 150 mm at a frequency of 2,000 MHz
Was set to 37.5 mm. As a result, these reactances are canceled out near that frequency, and
Characteristic is return loss 12d at 2,000MHz
B was improved to 25 dB, and 2.0
It is also improved in the frequency band from 00 MHz to 3,000 MHz.

FIG. 8 shows improved return loss versus frequency characteristics.

Although the interface unit of the present invention has been described in connection with the five embodiments, the interface unit of the present invention is not limited to these embodiments.
For example, it is possible to operate the movable tongue by external magnetic force using a reed relay instead of the coupling pin, or to attach a push button for the purpose of simply operating the movable tongue separately. It is clear from the principle that the movable tongue can be easily changed to a ball bearing.

[0075]

As described above, the coaxial cable interface unit of the present invention supplies a signal from an electronic device to a transmission line in a signal transmission line using a coaxial cable mainly installed in a general house, apartment house, office, or the like. This is an interface unit that guides the signal flowing through the line to the electronic equipment, and can use the signal that flows in from the signal introduction terminal side of the interface unit and the signal that flows in from the other signal introduction terminal side. Alternatively, the signals can be separately supplied to either side.

The interface unit of the present invention having such a function not only substantially widens the available frequency band of the line, but also fixes the head end at the forefront of the line like a TV joint receiving facility. In addition, the interface unit of the present invention can be installed at an arbitrary location on a track to supply a signal to the interface unit, and the headend can be installed at a plurality of locations. For this reason, for example, TV co-listening, local area network (LAN), transmission when different CS broadcasts have the same IF frequency, TV
New installation, expansion, application change, signal superimposition, repair, etc. of a signal line using a coaxial cable, such as superimposition of intercoms and surveillance cameras, can be made economically in a short time.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of one embodiment of the present invention.

FIG. 2 is an explanatory view of another embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a connection state in the embodiment of FIG. 2;

FIG. 4 is an explanatory view of still another embodiment of the present invention.

FIG. 5 is an explanatory view of still another embodiment of the present invention.

FIG. 6 is an explanatory diagram of a characteristic improvement according to still another embodiment of the present invention.

FIG. 7 is a diagram showing frequency-return loss characteristics of the embodiment of FIG. 1 of the present invention.

FIG. 8 is a diagram showing a frequency-return loss characteristic of the embodiment of FIG. 6 of the present invention.

FIG. 9 is an explanatory diagram showing an operation concept of the present invention.

FIG. 10 is an explanatory diagram of an example of an adapter combined with the coaxial cable interface unit of the present invention.

FIG. 11 is a conceptual diagram showing a configuration example of a TV co-listening system using the coaxial cable interface unit of the present invention.

FIG. 12 is an explanatory diagram of a TV co-listening system using a serial unit used in a conventional TV co-listening system.

FIG. 13 is an explanatory diagram of a serial unit used in a conventional TV co-listening system.

[Explanation of symbols]

 DSP Downstream line signal introduction terminal USP Upstream line signal introduction terminal DST Downstream branch terminal UST Upstream branch terminal 1-1 Signal introduction terminal 1-2 Signal introduction terminal 2-1 Coupling terminal 2-2 Coupling terminal 3-1 Movable tongue 3-2 Movable tongue 4 Conductive plate 5 Coupling pin 10 Housing

Claims (7)

[Claims] 1. At least two signal introduction terminals to which a coaxial cable is connected, at least two coupling terminals for transmitting and receiving signals to and from an external device, and a coupling pin inserted when necessary. An intermediate connection member disposed between the two signal introduction terminals, and a conductor portion and an insulator portion, wherein the intermediate connection member is always in contact with each of the signal introduction terminals. An interface unit for a coaxial cable, comprising: an element constituting the connection pin inserted into a member insertion portion of a connection member. 2. The coaxial cable interface unit according to claim 1, wherein said member insertion portion of said intermediate connecting member has a tongue piece at least one of which is movable so as to receive said coupling pin therebetween. Interface unit for cable. 3. The interface unit for a coaxial cable according to claim 1, wherein the coupling pin is formed by laminating a conductor and an insulator, and separates one of the tongue pieces from the other while separating the tongue pieces from each other. Interface unit for coaxial cable configured to connect external equipment. 4. Two signal introduction terminals arranged on the same straight line in opposite directions to each other and connected to a coaxial cable, respectively; In the meantime, a movable tongue disposed in a state of being always in contact with each of the signal introduction terminals, and formed between the two signal introduction terminals and the movable tongue to exchange signals with an external device. Coaxial cable interface unit, comprising: two coupling terminals for connecting the first and second terminals; a conductor portion and an insulator portion; and an element constituting a coupling pin inserted into the coupling terminal. 5. The interface unit for a coaxial cable according to claim 4, wherein a distance between the coupling terminals is a wavelength at an arbitrary frequency higher than a half of an upper limit frequency of a frequency band that can pass between the two signal introduction terminals. An interface unit for coaxial cables set to an electrical length of approximately one-fourth. 6. The interface unit according to claim 1, wherein the coupling pin inserted into the coupling terminal has a two-layer structure of an insulator and a conductor. 7. The interface unit according to claim 1, wherein the coupling pin inserted into the coupling terminal has a three-layer structure including a conductor, an insulator, and a conductor.