JPH114387A - Television terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the isolation between reception inputs where two frequency bands area in duplicate. SOLUTION: Two reception inputs are given to a 1st input terminal 2-1 and a 2nd input terminal 2-2 and outputted respectively from 1st output terminal 2-3 and a 2nd output terminal 2-4. A shield fixture 3-1 is provided between a 1st system consisting of the 1st input terminal 2-1 and the 2nd output terminal 2-4 and a 2nd system consisting of the 2nd input terminal 2-2 and the 2nd output terminal 2-4 to attain sufficient isolation between both the input terminals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case where two television antennas having different reception bands are installed, and the antennas are installed in a wall or the like of a house for outputting reception signals of the two television antennas. The present invention relates to a television terminal device to be attached.

[0002]

2. Description of the Related Art As shown in FIG.
1 and the UHF antenna 102 are installed,
A VHF / UHF mixer 103 is attached to an antenna pole on which a VHF antenna 101 and a UHF antenna 102 are attached. And the received UHF reception signal. Then, the VHF / UHF mixer 103
Conventionally, a mixed VHF / UHF signal output from a wall terminal 104 is drawn indoors by a single coaxial cable and output from a wall terminal 104. In this case, the wall terminal 104 is provided in a television terminal device mounted in a box installed in the wall.

[0003] When a CS antenna for receiving horizontally polarized waves and a CS antenna for receiving vertically polarized waves are installed, the frequency bands to be received mutually overlap. Cannot simply mix the received signals received by the other antennas. Therefore, in such a case, as shown in FIG. 7, a distributor 113 is provided so as to be reversely connected instead of the mixer, and one output terminal of the distributor 113 is provided with a CS antenna 111 for receiving horizontal polarization. By inputting the received signal received and inputting the received signal received by the CS antenna 112 receiving the vertically polarized wave to the other output terminal of the distributor 113, the two received signals are mixed. Then, the mixed signal output from the distributor 113 is drawn indoors by one coaxial cable, and is output from the wall surface terminal 114.

[0004] Alternatively, a CS antenna 111 that receives horizontal polarization using a block converter, or a CS antenna 11 that receives vertical polarization.
2. Any one of the frequency bands of the received signal received in step 2 is moved so that the frequency bands do not overlap each other. For example,
When a BS antenna is further provided, the intermediate frequency (BS-IF) of the BS is set to 1035 to 1335 MHz, so that the intermediate frequency (CS-I) of the vertically polarized CS is set.
F) from 1293 to 1533 MHz to 1385 to 162
5MHz and horizontal-polarized CS-IF from 1308-1548MHz to 1655-1895MH
Move to z. Then, after moving the frequency band, the mixing is performed. As a result, it is possible to receive received signals of a plurality of antennas indoors using one coaxial cable without overlapping frequency bands.

As shown in FIGS. 8 (a) and 8 (b), it has also been conventionally practiced to lead indoors by a coaxial cable independently of each antenna. That is, as shown in FIG. 8A, a reception signal received by the VHF antenna 101 is output from the wall surface terminal 115 via a coaxial cable connected to the VHF antenna 101. Further, a reception signal received by the UHF antenna 102 is output from the wall terminal 116 via a coaxial cable connected to the UHF antenna 102.

[0006] Further, when it is desired to receive signals by a plurality of receivers, as shown in FIG.
The received signal received at (1) is split into two by the distributor 106, drawn indoors by two coaxial cables, and output from the wall terminals 117 and 118, respectively. Then, the received signal received by the CS antenna 107 is split into two by the splitter 108, drawn indoors by two coaxial cables, and output from the wall terminals 119 and 120, respectively.

[0007]

The above-mentioned conventional example in which the frequency bands of the reception signals received by a plurality of antennas are close to each other or at least partially overlap, for example, in the case shown in FIG. The operating frequency band of the CS-IF-compatible distributor 113 that distributes the BS is as wide as 10 to 1880 MHz, and the BS-IF frequency band and CS
-15 d coupling loss between terminals in IF frequency band
B or more. However, if the isolation between the two input signals is not normally set to 25 dB or more, the image of the reception signal on the non-selected side will be displayed on the screen. That is, the conventional example shown in FIG. 7 has a problem that sufficient isolation cannot be obtained.

In the method of moving the overlapping frequency bands by the block converter so as not to overlap,
Since the price of the block converter is expensive, there is a problem that the cost is too high and the installation is difficult in a small-scale receiving system such as an ordinary house. In addition, in the conventional example shown in FIG. 8, since a plurality of TV terminal devices having wall terminals are required, it is necessary to install a box for housing the TV terminal devices installed on the wall for each system, Since it is necessary to provide a distributor for each system, there is a problem that a lot of space is required and the cost is high.

Therefore, the present invention does not require a plurality of boxes installed in the wall surface, and can obtain a sufficient isolation between the two inputs although the cost can be reduced. It is an object of the present invention to provide a television terminal device which can be used.

[0010]

To achieve the above object, a television terminal device according to the present invention comprises: a first input terminal to which a first reception signal received by an antenna in a first reception band is input; A second input terminal to which a second reception signal received by an antenna of a second reception band that is close to or at least partially overlaps with the first reception band is input;
A first output unit that outputs a first reception signal input from an input terminal;
A first print for connecting an output terminal, a second output terminal for outputting a second received signal input from the second input terminal, a core wire of the first input terminal, and a core wire of the first output terminal; A pattern; a core wire of the second input terminal;
A substrate on which a second printed pattern connecting the core wire of the output terminal is formed, and a space having a wide portion and a narrow portion,
The first output terminal and the second output terminal are mounted on the front surface, and the first input terminal and the second input terminal are connected to the lower surface of the wide portion from the wide portion to the narrow portion. A conductive case attached to the, comprising a conductive back cover fitted to the wide portion and the narrow portion,
A shield fitting for shielding between the first print pattern and the second print pattern is provided on the substrate, and a contact piece that contacts an inner surface of the case and an inner surface of the back cover is an edge of the shield fitting. Protruding from the part.

In the television terminal device, the case is attached to an attachment frame attached to a box installed on a reception terminal installation surface such as a wall surface of a house, and the first output terminal and the second output terminal are attached. The terminal is mounted so as to be exposed from the receiving terminal installation surface.

In the television terminal device of the present invention, two inputs whose frequency bands are close to each other or at least partially overlap each other are independently led into one television terminal device, and a shield is provided between the respective systems. As a result, sufficient isolation between the two inputs can be obtained. Further, since only one television terminal device is required, the space can be reduced and the cost can be reduced.

[0013]

FIG. 1 is a schematic diagram showing an embodiment of a television terminal device according to the present invention. As shown in the figure, the television terminal device 10 has a first input terminal 2-1 and a second input terminal 2
-2, and the first output terminal 2-3 and the second output terminal
It has a total of four input terminals including an output terminal 2-4 and an output terminal. These four input terminals 2-1 and 2-2 and the output terminals 2-3 and 2-4 are constituted by coaxial connectors with good shield such as F-type connectors. The first input terminal 2-1 and the first output terminal 2-3 are connected in the television terminal device 10, and the first reception signal input to the first input terminal 2-1 is directly transmitted to the first input terminal 2-1. 1 output terminal 2
-3. The second input terminal 2-2 and the second output terminal 2-4 are connected in the television terminal device 10, and the second input terminal 2-2 is connected to the second input terminal 2-2.
Is output from the second output terminal 2-4 as it is.

The received signal input to the first input terminal 2-1 and the received signal input to the second input terminal 2-2 are a BS-IF signal and a CS-IF signal, or a horizontally polarized signal. And the received signal whose frequency band at least partially overlaps, such as the CS-IF signal and the vertically polarized CS-IF signal. And the first in the television terminal device 10
Between a first system in which the input terminal 2-1 and the first output terminal 2-3 are connected, and a second system in which the second input terminal 2-2 and the second output terminal 2-4 are connected. , A shield fitting 4 is provided to shield the first system and the second system so as not to be connected to each other. Thereby, the television terminal device 10
Even if two reception inputs whose frequency bands overlap each other are supplied, the isolation amount between the two reception inputs can be made a sufficient isolation amount.

Next, FIG. 3 shows a detailed configuration of the television terminal device 10 shown in FIG. FIG. 3 is an exploded perspective view of the television terminal device 10. The television terminal device 10 includes a mounting frame 1, a conductive case 2 mounted on the mounting frame 1, a printed board 3 housed in the case 2, It comprises a shield fitting 4 mounted on the substrate 3 and a conductive back cover 5 fitted on the back side of the case 2. The mounting frame 1 is manufactured by integrally molding a resin or the like, and mounting portions 1-3 and 1-4 are formed at upper and lower ends thereof. The mounting portions 1-3 and 1-4 are portions that are mounted to a box installed in a wall of a house with two screws. Also, the output terminals 2-3 and 2-4 for guiding the reception signal to the receiver are inserted into the mounting frames 1-3 and 1-4, and the two insertion holes 1 and 2 are inserted therein.
1, 1-2 and a pair of holding pieces 1-5 for holding the narrow portion 22 of the case 2 are formed.

The case 2 formed of a conductor such as a metal is composed of a wide portion 21 and a narrow portion 22 and has a T
It is shaped like a letter. In addition, a first output terminal 2-3 and a second output terminal 2-4 each formed of a coaxial plug are fixed to the front surface of the case 2. Further, on the lower surface of the wide portion 21 at the portion where the wide portion 21 and the narrow portion 22 are connected, a first input terminal 2-1 and a second input terminal 2-1 each formed of a coaxial connector so as to sandwich the narrow portion 22 are provided. The input terminal 2-2 is fixed.

The printed circuit board 3 accommodated in the case 2 has a core wire of a coaxial connector constituting the first input terminal 2-1 and a coaxial connector constituting the first output terminal 2-3. A first printed pattern connecting the plug core wire 2-5, and a coaxial plug core wire forming the second input terminal 2-2 and a coaxial forming the second output terminal 2-4. Connecting core wire 2
-6 and a second print pattern connecting the first print pattern and the second print pattern. The printed circuit board 3 is provided with a shield metal fitting 4 at an angle so as to be located between the first print pattern and the second print pattern. The shield fitting 4 is made of an elastic metal material, and a pair of connecting pieces 4-2 formed at one end edge thereof are inserted into mounting holes formed in the printed circuit board 3 and soldered. . An earth pattern is formed on a portion of the printed circuit board 3 to which the shield plate 4 is soldered. Further, a large number of contact pieces 4-1 that elastically contact the case 2 and the back cover 5 are provided around the shield plate 4.

After the printed circuit board 3 is housed in the case 2 and the electrical connection is made, the conductive back cover 5 made of a metal plate or the like is fitted from the back side of the case 2.
The back cover 5 has a substantially T-shape including a wide surface 51 and a narrow surface 52 so as to cover the openings of the wide portion 21 and the narrow portion 22 of the case 2.
And the height between the surface of the opening of the wide portion 21 of the case 2 and the surface of the opening of the narrow portion 22 has a step.
The narrow surface 52 is bent in accordance with the surface of the opening. The recess 5-1 formed on the wide surface 51 is
It is a part to which a nameplate and the like are attached.

Next, FIG. 4 shows a state in which the printed circuit board 3 is housed in the case 2 and electrical connection is made. This figure 4
FIG. 3 is a rear view of the television terminal device 10 with the back cover 5 removed. In FIG. 4, a plurality of recesses 3-3 are formed around the printed board 3, and a plurality of protrusions 2-7 formed on the inner surface of the case 2 are fitted into the recesses 3-3, 3 is soldered to the ground pattern. Also, the core wire 2-11 of the coaxial connector constituting the first input terminal 2-1 is soldered to the printed circuit board 3, and the coaxial connector constituting the second input terminal 2-2. The core wire 2-21 is soldered to the printed circuit board 3.

Further, the core wire 2-11 is connected to the core wire 2-5 of the coaxial connector constituting the first output terminal 2-3, and this connection is made to the first series printed portion 31 of the printed circuit board 3. This is performed by the print pattern formed in the above. The core wire 2-21 is connected to the second output terminal 2-4.
Is connected to the core wire 2-6 of the coaxial connector constituting the second series printed portion 3 of the printed circuit board 3.
2 is performed by using the print pattern formed in the second pattern. The shield fitting 4 is provided diagonally so as to separate the first series printing unit 31 and the second series printing unit 32. The shield fitting 4 allows the second input terminal 2 to be included in the reception signal output from the first output terminal 2-3.
-2 can be prevented from being mixed. Further, it is possible to prevent the reception signal input from the first input terminal 2-1 from being mixed into the reception signal output from the second output terminal 2-4.

FIG. 5 shows the isolation characteristics between the first and second systems in the television terminal device of the present invention shown in FIGS. 3 and 4. The isolation characteristic shown as A in FIG. 5 is a characteristic when the shield fitting 4 is provided, and the isolation characteristic shown as B in FIG. 5 is a characteristic when the shield fitting 4 is not provided. By observing these isolation characteristics, it is understood that the provision of the shield fitting 4 makes it possible to obtain good isolation characteristics of about 40 dB or more in all frequency bands. Therefore, according to the television terminal device 10 of the present invention, the first output terminal 2-3 and the second output terminal 2-4.
When a received signal output from the TV receiver is supplied to a television receiver, it is possible to prevent an image on which a video of another system not selected is mixed from appearing on the screen.

Next, a modification of the television terminal device of the present invention is shown in FIG. The modification shown in FIG.
The distributor 13-1 and the distributor 13-2 are incorporated on a printed circuit board housed in the "0". Therefore, according to the modification, the received signal of the first system input from the first input terminal 12-1 is divided into two by the distributor 13-1, and the first received signal is divided into the first system.
The output signal can be output from the output terminal 12-3 and the second output terminal 12-4, and the received signal of the second system input from the second input terminal 12-2 is split into two by the splitter 13-2. Third output terminal 12-5 and fourth output terminal 1
2-6. Also in this case, the first
A shield 14 is provided between the system and the second system so as to be electrically separated.

[0023]

As described above, according to the present invention, two inputs whose frequency bands are close to each other or at least partially overlap each other can be independently drawn into one television terminal device. Since each system is shielded, sufficient isolation between the two inputs can be obtained. Also, since only one television terminal device is required, the space can be reduced. The length of the coaxial cable up to the TV terminal device is almost twice as long, but it is necessary to consider the cost of installing two boxes on the wall and the need for a block converter when receiving satellite broadcasting. If
The television terminal device of the present invention can reduce the cost as a whole.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of an embodiment of a television terminal device of the present invention.

FIG. 2 is a schematic diagram showing a configuration of a modification of the embodiment of the television terminal device of the present invention.

FIG. 3 is an exploded perspective view showing a detailed configuration of the embodiment of the television terminal device of the present invention shown in FIG. 1;

FIG. 4 is a rear view showing a detailed configuration of the embodiment of the television terminal device of the present invention shown in FIG. 1;

FIG. 5 is a diagram illustrating an isolation characteristic of the television terminal device of the present invention.

FIG. 6 is a first conventional example of drawing an antenna reception signal indoors;
It is a figure for explaining the form.

FIG. 7 shows a conventional second method for drawing an antenna reception signal indoors.
It is a figure for explaining the form.

FIG. 8 is a diagram for explaining another conventional mode for drawing an antenna reception signal indoors.

[Explanation of symbols]

1 Mounting Frame 2 Case 2-1, 2-2, 12-1, 12-2 Input Terminal 2-3, 2-4, 12-3, 12-4, 12-5, 12
-6 Output terminal 3 Printed circuit board 4, 14 Shield fitting 5 Back cover 10 TV terminal device

Claims (2)

[Claims] 1. A first input terminal to which a first reception signal received by an antenna of a first reception band is inputted, and a second reception terminal which is close to or at least partially overlaps the first reception band. A second input terminal to which a second reception signal received by a band antenna is input, a first output terminal to output a first reception signal input from the first input terminal, and the second input terminal A second output terminal for outputting a second received signal input from the first input terminal; a core wire of the first input terminal; a first print pattern connecting the core wire of the first output terminal; A substrate on which a core wire and a second printed pattern for connecting the core wire of the second output terminal are formed; a space having a wide portion and a narrow portion; and the first output terminal and the second output terminal And a first input terminal. A conductive case attached to the lower surface of the wide part connected to the narrow part from the wide part; and a conductive part fitted to the wide part and the narrow part. A back cover for shielding between the first print pattern and the second print pattern is provided on the substrate, and is in contact with an inner surface of the case and an inner surface of the back cover. A television terminal device, wherein a contact piece protrudes from an edge of the shield fitting. 2. The first output terminal and the second output terminal, wherein the case is mounted on a mounting frame mounted in a box installed on a receiving terminal installation surface such as a wall surface of a house.
The television terminal device according to claim 1, wherein an output terminal is attached so as to be exposed from the receiving terminal installation surface.