JPH02306562A - Tv plug socket - Google Patents

Abstract

PURPOSE:To reduce a change of various kinds of loss due to the frequency so as to be used for broad casting up to a 1GHz band by making a structure of a TV plug socket with an interior finish of a substance mounted with a circuit part a prescribed one so as to enlarge an area of an earth part. CONSTITUTION:A plug socket body has a shield plate 40 electrically connecting to an outside conductor of a first coaxial cable being fixed to the rear thereof, while being provided with a receptable 20 electrically connecting to an outside conductor of a second coaxial cable in the front. A shield cover 31, a receptacle 20 and a shield plate 40 are electrically connected in the inside of the plug socket body through a projection piece provided therein while being connected to an earth pattern of a circuit substrate 30 mounted inside the plug socket body. Thereby, an area of an earth part is enlarged so that various kinds of loss such as a loss between the input and output terminals are limited to an amount to be satisfied by the broad casting from a VHF to 1GHz band.

Description

[Detailed description of the invention] [Industrial application field]

TECHNICAL FIELD The present invention relates to a TV outlet that is inserted between an antenna for receiving TV broadcasting and a receiver, and to which a coaxial cable is detachably connected.

[Conventional technology]

Conventionally, this type of TV outlet has been provided in various types, and is used in a range from a VHF reception band to a UHF reception band.

[Problem to be solved by the invention]

Conventional TV outlets were designed to meet specified performance in the range from the VHF reception band to the UHF reception band, so they did not meet the specified performance at the primary conversion frequency of satellite broadcasting (IGHz band). There was a problem that it was not possible to satisfy the standards (EIAJ standards, etc.). The present invention aims to solve the above problems, and I
The present invention aims to provide a TV outlet that satisfies specified performance even in the GI-1z band.

[Means to solve the problem]

In the present invention, in order to achieve the above object, the outlet main body is formed in a shape that opens on the back side, and a shield cover disposed on the front side of the board and a shield cover disposed on the back side of the board open on the back side of the outlet main body. A shield plate that covers the opening is attached to the outlet body, and an inner contact that is connected to the center conductor of the coaxial cable and an outer contact that is connected to the outer conductor of the coaxial cable are attached to the receptacle facing the front of the outlet body. The outer contact is connected to the shield cover, the ground pattern of the board is connected to the shield cover, and the first connection piece protruding toward the back side is attached to the circumference of the shield cover, and the front contact is attached to the circumference of the shield plate. The second part protrudes toward the side.
The shield cover and the shield plate are electrically connected by sandwiching one of the connecting pieces and the other between the inner circumferential surface of the outlet body. In addition, the circuit section is a signal passing circuit that passes an input signal from the antenna side and outputs the signal, the terminal is an input terminal to which a coaxial cable that transmits the input signal is connected, and the output signal is outputted via the receptacle. It is a good idea to do so. Alternatively, the circuit section may be a branch circuit that branches part of the input signal from the antenna side as a branch output signal, and the remainder as an output signal, and the terminal is an input terminal to which a coaxial cable for transmitting the input signal is connected. , and an output terminal to which a coaxial cable for transmitting the output signal is connected may be provided, and the branched output signal may be outputted via the receptacle. Furthermore, it is desirable to insert a bypass circuit made of an inductance for high frequency blocking between the input terminal and the output terminal.

[Effect]

According to the above configuration, a shield cover and a shield plate are arranged before and after the board on which the circuit section is mounted, and the outer contact on the ground side of the receptacle is coupled to the shield cover, and the ground pattern of the board is connected. A first plate coupled to the shield cover and further provided on the periphery of the shield cover.
Since the connecting piece and the second connecting piece provided on the shield plate are in contact with each other, the area of the grounding part can be increased.
This makes it possible to reduce changes in various losses due to frequency. That is, it becomes possible to satisfy a predetermined performance from the V)(F band to the IGHz band, which is the first conversion frequency of the satellite broadcast reception wave.

[Example 1] In this example, a configuration including a branch circuit will be exemplified. 1st
As shown in the figure, the outlet main body 10 is formed of an insulating material such as ABS resin and has a shape that is open on the back side. The outlet main body 10 has wiring that is standardized according to the JIS standards and the Japan Wiring Appliance Industry Association standards so that up to three large rectangular wiring devices can be attached to a mounting frame that is standardized for three. The dimensions are set to be equivalent to the unit dimensions of the fixture. A protrusion 11 is protruded from the center of the front surface of the outlet body 10, and a receptacle 20 is formed at the center of the protrusion 11. Mounting holes 12 are formed on both sides of the protruding base 11 to be connected to a metal mounting frame, and a pair of mounting claw pieces are formed on both sides of the outlet body 10 to be connected to a synthetic resin mounting frame. 13 is provided protrudingly. Furthermore, assembly protrusions 14 are provided protruding from the lower portions of both sides of the outlet body 10 in FIG. 1, respectively. Assembly protrusion 14
A recess 15 is formed in the upper surface of. The receptacle 20 has a recess 21 with a circular cross section formed on the front surface of the protrusion 11, and a cylindrical connecting tube 22 protruding from the bottom surface of the recess 21 and concentric with the recess 21. Connection tube 2
An outer contact 23 formed by bending a conductive sheet metal is disposed around the connecting tube 22, and an insertion hole 24 formed by bending a conductive sheet metal is provided in the insertion hole 24 formed at the center of the connecting tube 22. An inner contactor 25 is provided. The receptacle 20 is formed to accommodate a C13 type connector, and when a connector connected to a coaxial cable is inserted into the receptacle 20, the outer conductor of the connector connected to the outer conductor of the coaxial cable is inserted into the recess 21. The center conductor of the connector inserted between the inner circumferential surface and the outer circumferential surface of the connecting tube 22 to contact the outer contactor 23 and connected to the center conductor of the coaxial cable is introduced into the insertion hole 24 to make inner contact. The child 25 is contacted. A pair of terminal pieces 26 are protruded from the outer contactor 23, and a terminal piece 27 is also protruded from the inner contactor 25. A board 30 on which a branch circuit to be described later is mounted is disposed inside the outlet main body 10, and a shield cover 31 is disposed on the front side (upper side in FIG. 1) of the outlet main body 10 with the board 3o in between. A shield plate 40 is provided on the rear side. The shield cover 31 has a U-shaped cross section and is provided with a through hole 32 in the center thereof through which the outer contactor 23 passes. Furthermore, a first connecting piece 33 extends from both ends of each leg of the shield cover 31, and a contact protrusion 34 protrudes from the outer surface of the first connecting piece 33. However, as shown in FIG.
3 and the inner contact 25, insert the reshield force bar 31 from the back of the outlet main body 1o, insert both terminal pieces 26 of the outer contact 23 into the through hole 32, and insert the third
As shown in the figure, connect one terminal piece 26 to the shield cover 3.
If the outer contactor 23 and the shield cover 31 are bent at the back side of the outer contactor 1 and soldered to the shield cover 31, the outer contactor 23 and the shield cover 31 are electrically connected. Further, the shield cover 31 is soldered to the ground pattern of the board 3°, and the other terminal piece 26 of the outer contact 23 is also soldered connected to the ground pattern of the board 3o. electrically connected to the On the other hand, the shield plate 40 is disposed so as to cover the back surface of the outlet main body 1° so as to substantially cover the front surface thereof. Assembly pieces 41 are provided protruding from both side edges of the shield plate 40. The assembly piece 41 is approximately U-shaped, and the tips of both leg pieces are connected to the shield plate 40.
When the assembly piece 41 is bent and the assembly protrusion 14 is inserted into the assembly hole 42 formed in the assembly piece 41, the shield plate 40 is attached to the outlet body 10. be combined. In addition, the assembly piece 41
By caulking a portion of the plate so that it fits into the recess 15, the bonding strength is further increased. The shield plate 40 has second connection pieces 43 protruding from each of the four corners, and the second connection pieces 43 extend along the guide grooves 16 formed on the inner peripheral surface of the outlet main body 10 so as to run in the front-rear direction. It is inserted into the outlet main body 10. Here, the bottom surface of the guide groove 16 faces the first connecting piece 33 provided on the shield cover 31,
The tip of the second connecting piece 43 is connected to the first connecting piece 33 and the guide groove 1.
6, the first connecting piece 33 and the second connecting piece 43 are electrically connected. The first connecting piece 33 has a contact protrusion 34 protruding from the side facing the bottom surface of the guide groove 16, and since the contact protrusion 34 comes into pressure contact with the second connecting piece 43, the first connecting piece 33 and The second connection piece 43 is electrically connected reliably. In this way, the shield cover 31 and the shield plate 40 are electrically connected. By the way, the terminal piece 27 of the inner contactor 25 of the receptacle 20 is connected to the substrate 30 through the through hole 32 of the shield cover 31, as shown in FIG. The board 30 includes
A pair of contact springs 36 are implemented. Each contact spring 36 is
It has a pair of press-fit pieces 36a that are arranged opposite to each other and have a spring force that reduces the distance between them. The contact spring 36 is mounted on the board 30 so as to protrude to the back side of the board 30, and a terminal case 37 is disposed on the back side of the board 30 to cover the contact spring 36. The terminal gauge 37 is made of a transparent insulating material such as polycarbonate, and includes a pair of cylindrical parts 38 that cover each contact spring 36.
A wire insertion opening (not shown) is formed on the distal end surface of the cylindrical portion 38 at a location corresponding to the space between the press-fit pieces 36a. Further, a pair of leg pieces 39 are provided on the terminal case 37 so as to protrude along the inner circumferential surface of the outlet main body 10 . A notch 44 is formed on one side edge of the shield plate 40, and a fourth
As shown in the figure, when the board 40, the terminal case 37, and the shield plate 50 are sequentially attached to the outlet body 10, the cylindrical portion 38 of the terminal case 37 will protrude to the back side of the outlet body 10 through the notch 44. It will be installed. Notch 44
Holding pieces 45 that protrude toward the back side are formed by cutting and bending on both inner edges of the holder, and holding holes 46 are formed in the holding pieces 45.
is perforated. Further, a punch hole 35 is bored in the center of the shield plate 40. A press plate 50 having a substantially U-shaped cross section is disposed on the back side of the shield plate 40.
Axial legs 51 that protrude outward from both legs of the holding plate 50 are inserted into the holding holes 46 . Therefore, the presser plate 50 can be raised and lowered around the pivot leg 51 with respect to the shield plate 40. A pair of grooves 52 running in the direction along the rotating surface are formed in the holding plate 50, and a coaxial cable can be held between the inner peripheral surface of each groove 52 and the back surface of the shield plate 40. . Further, a push-pull insertion hole 53 is bored in a region between both groove portions 52 . Screw insertion hole 5
A set screw 54 that is screwed into a screw hole 35 provided in the shield plate 40 is inserted into the set screw 54, and a C ring 5 is inserted into the set screw 54.
5 is attached, and the head of the set screw 54 and the C-ring 55 are arranged with the circumferential portion of the screw insertion hole 53 interposed therebetween, thereby preventing the set screw 54 from falling off from the holding plate 50. According to the above configuration, when the set screw 54 is loosened, the presser plate 50
With the cable raised up against the shield plate 40, insert the center conductor of the coaxial cable into the wire insertion opening provided in the cylindrical part 38 of the terminal case 37, hold it in the contact spring 36, and then tighten the set screw 54. , shield plate 40 and presser plate 50
The outer conductor of the coaxial cable is sandwiched between the two. The branch circuit mounted on the board 30 is a circuit as shown in FIG. 6, and includes a pair of transformers T. A transformer type directional coupler using T2 is constructed. Since the primary winding of the first transformer T1 is inserted between the input terminal IN and the output terminal 0tJT, high frequency signals do not pass therethrough, and only direct current passes therethrough. In other words, the primary winding of the transformer T1 functions as a bypass circuit for passing direct current. The high frequency signal is branched through both transformers T + and T 2 , and a branch terminal BR is connected to one end of the secondary winding of one transformer T 2 via a capacitor C 1 . Therefore, branch terminal BR, input terminal IN and output terminal OU
Since a capacitor C3 is inserted between the T and T, high frequency signals are passed through, but direct current is blocked. In addition, a dummy resistor R is connected to the other end of the secondary winding of the transformer T2.
1 is connected. With this configuration, a part of the high frequency signal transmitted between the input terminal IN and the output terminal OUT can be branched to the branch terminal BR. Further, in the branch circuit, direct current passes between the output terminal OUT and the input terminal IN, so that power can be supplied to the booster and the like. The input terminal IN and the output terminal OUT correspond to each of the contact springs 36 described above, and the branch terminal BR is connected to correspond to the receptacle 20. Furthermore, input terminal I
Jumper wires J, , J are connected to N and output terminal OUT, respectively.
2 is inserted, and capacitors 02 to C6 are inserted at important points between the ground pattern and the ground pattern of the board 30. When the characteristics of the TV outlet constructed as described above were measured, the results shown in FIG. 7 were obtained. Here, from the top, insertion loss between input terminal IN and output terminal OUT, branch loss between input terminal IN and branch terminal BR, reflection loss, and reverse coupling between output terminal and branch terminal BR. Indicates loss. According to the measurement results, it was found that a TV outlet that satisfies EIAJ standards from the VHF band to the IGHz band and is compatible with all TV broadcasts including satellite broadcasts can be obtained. The TV outlet formed as described above is attached to a mounting frame 60 having a shape as shown in FIG. This mounting frame 60 is standardized for wiring devices, and is formed so that up to three standardized wiring devices can be attached thereto. That is, the mounting frame 60 is made of synthetic resin, and an opening window 61 is formed in the center. Both side pieces 62 of the mounting frame 60
6 holding holes 63a and 6 are provided in holes 63a and 62b, respectively.
3b is formed, and four holding holes 63a, 63b each.
The mounting claw piece 13 of the case 10 is inserted into the case 10. The holding holes 63a of one side piece 62a are provided at both shoulders of the operating piece 64, which can be bent to change the distance from the side piece 62a. Therefore, when the case 10 is pressed from the back side of the mounting frame 60 with one mounting claw piece 13 inserted into the holding hole 62b, the operation piece 64 is bent and the mounting claw piece 13 is fitted into the holding hole 63a. be. Further, when removing the case 1o from the mounting frame 60, the mounting claw piece 13 can be easily removed from the holding hole 63a by prying the operation piece 64 with a screwdriver or the like. A pair of elongated holes 66 are formed in each of the connecting pieces 65 of the mounting frame 6o, and the mounting frame 60 is fixed to a switch box embedded in a wall surface etc. using box screws inserted through the elongated holes 66. It is now possible to do so. Further, a pair of threaded holes 67 are formed in each of the connecting pieces 65, and a decorative plate covering the front side of the mounting frame 60 can be attached using plate screws that are screwed into the threaded holes 67. [Embodiment 2] In Embodiment 1, a branch circuit was built in, but in this embodiment, a structure is adopted in which there is no branch. That is, as shown in FIG. 9, only one contact spring 36 is provided on the board 30, and a terminal case 37 is provided correspondingly.
There is also one cylindrical portion 38, and furthermore, only one groove portion 52 is provided in the presser metal fitting 50. On the other hand, a signal passing circuit having a configuration as shown in FIG. 10 is mounted on the substrate 30. That is, between the input terminal IN and the output terminal OUT, there is a circuit in which capacitors C7 and C8 are connected to both ends of a matching circuit made up of resistors R2 to R1, and an inductance that allows direct current to pass through but blocks high frequency signals. It has a configuration in which a parallel circuit with a bypass circuit for passing is inserted. According to this configuration,
A capacitor C1 is connected between the input terminal IN and the output terminal OUT.
1. High frequency signal passes through C2 and output terminal OUT
Direct current passes through an inductance L between the input terminal IN and the input terminal IN. In other words, it has a current passing type configuration that can supply power to boosters and the like. Here, the input terminal IN is connected to correspond to the contact spring 36, and the output terminal OUT is connected to correspond to the receptacle 20. The other configurations are the same as in the first embodiment. According to the configuration of this embodiment, characteristics as shown in FIG. 11 can be obtained. That is, the graph in FIG. 11 shows, in order from the top, the coupling loss between the input terminal IN and the output terminal OUT,
Indicates reflection loss. From this measurement result, it was found that, as in Example 1, it was possible to obtain a TV outlet that could meet the EIAJ standards in all TV broadcast bands from the VHF band to the IGHz band.

【Effect of the invention】

As described above, the present invention includes an outlet main body formed in a shape with an opening on the back side, a shield cover disposed on the front side of the board, and a shield disposed on the back side of the board that covers the opening on the back side of the outlet main body. The plate is attached to the outlet body, and the receptacle facing the front of the outlet body is provided with an inner contact that is connected to the center conductor of the coaxial cable and an outer contact that is connected to the outer conductor of the coaxial cable. a first connection piece protruding toward the back side from the circumference of the shield cover, and a first connection piece protruding from the circumference of the shield plate toward the front side. The shield cover and the shield plate are electrically connected by sandwiching one of the protruding second connection pieces and the other between the inner peripheral surface of the outlet body, and the circuit part is A shield cover and a shield plate are arranged before and after the mounted board, and the outer contact that becomes the ground side of the receptacle is connected to the shield cover, the ground pattern of the board is connected to the shield cover, and the shield Since the first connection piece provided on the circumference of the cover and the second connection piece provided on the shield plate are in contact, the area of the grounding part can be increased, reducing changes in various losses due to frequency. It is possible. That is, it has the advantage of being able to satisfy a predetermined performance in all TV broadcast bands from the VHF band to the IGHz band, which is the first conversion frequency of satellite broadcast reception waves.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing Embodiment 1 of the present invention, Fig. 2 is an exploded perspective view of the main parts of the same, Fig. 3 is a rear view of the same during assembly, and Fig. 4 is an exploded perspective view of the main parts of the same. Figure 5 is a rear view of the same as the above during assembly, Figure 6 is a circuit diagram showing a branch circuit used in the same, Figure 7 is an operation explanatory diagram showing an example of the operation of the same.
Figure 8 is a perspective view showing an example of the mounting frame used for the same as above;
FIG. 10 is an exploded perspective view showing a second embodiment of the present invention, FIG. 10 is a circuit diagram showing a signal passing circuit used in the same, and FIG. 11 is an operation explanatory diagram showing an example of the operation of the same. 10... Outlet body, 2o... Receptacle,
23...Inner contact, 25...Outer contact, 3o.
... Board, 31... Shield cover, 33... First
Connection piece, 36... contact spring, 4o... shield plate,
43...Second connection piece, L...Inductance, T
I, T 2...Trans. Agent Patent Attorney Ishi 1) Chief 7 Figure 1 10. 10... Outlet body 20... Receptacle 23... Inner contact 25... Outer contact 30... Board 31... Shield cover 33... First connection piece 36... Contact spring 40...Shield plate 43...Second connection piece L...Inductance T I, T 2...Transformer 22

Claims (4)

[Claims] (1) The terminal for connecting the first coaxial cable is placed facing the back of the outlet body, and the receptacle to which the connector connected to one end of the second coaxial cable is detachably connected is located on the front side of the outlet body. In the TV outlet, the outlet body is formed in a shape with an opening on the back side, and a board mounted with a circuit unit for transmitting a TV signal between the terminal and the receptacle is housed inside the outlet body. A shield cover placed on the front side of the board and a shield plate placed on the back side of the board covering the opening on the back side of the outlet body are attached to the outlet body, and the receptacle is connected to the center conductor of the coaxial cable. an inner contact connected to the outer conductor of the coaxial cable, and an outer contact connected to the outer conductor of the coaxial cable, the outer contact connected to the shield cover, the ground pattern of the board connected to the shield cover, One of the first connecting piece protruding toward the back side of the shield plate and the second connecting piece protruding toward the front side of the peripheral part of the shield plate connects the other side to the inner circumferential surface of the outlet main body. A TV outlet characterized in that a shield cover and a shield plate are electrically connected to each other by being sandwiched between them. (2) The circuit section is composed of a signal passing circuit that passes an input signal from the antenna side and outputs it as an output signal, and the terminal forms an input terminal to which a coaxial cable that transmits the input signal is connected, and the output signal is output. The TV outlet according to claim 1, wherein is outputted through the receptacle. (3) The above circuit section consists of a branch circuit that branches part of the input signal from the antenna side as a branch output signal, and outputs the rest, and the above terminal connects a coaxial cable that transmits the input signal. 2. The TV outlet according to claim 1, comprising an input terminal and an output terminal to which a coaxial cable for transmitting an output signal is connected, and the branch output signal is outputted through the receptacle. (4) The TV outlet according to claim 2 or 3, characterized in that a bypass circuit made of an inductance for high frequency blocking is inserted between the input terminal and the output terminal.