JPH0523021Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention is an integrated type suitable for inputting UHF signals and VHF signals to a television receiver.
It concerns UHF/VHF adapters.

(B) Prior Art A conventional UHF/VHF adapter used to input UHF signals and VHF signals to a television receiver will be described below.

Figure 3 is a diagram showing a conventional UHF/VHF adapter, Figure 4 is a circuit diagram of the main part of Figure 3, and Figure 5 is a diagram showing a conventional UHF/VHF adapter.
The main part block diagram in the figure, Figures 6 and 7 are diagrams showing the terminal board installed on the back of the television receiver.To explain the figure number and configuration, 1 is the UHF signal transmitted by the coaxial cable. /VHF mixed signal input terminal, 2 is a separation filter, 3 is a UHF conversion transformer, 4 is a resin-molded storage member, 5 is an input terminal.
UHF parallel two-wire feeder wire, 6 is coaxial cable,
7 is a VHF75Ω plug consisting of an outer contact 8, a center contact 9, a break terminal 10, and a tip spring 11; 12 is a VHF conversion transformer;
13 is a switch connected to the a terminal or the b terminal;
14 is a resin-molded storage member, 15 is a VHF parallel two-wire feeder wire, and 16 is a VHF 300Ω terminal 17
and a terminal board with UHF300Ω terminal 18, 19 is
This is a terminal board provided with a VHF75Ω terminal 20 and the UHF300Ω terminal 18. The state in which the break terminal 10 and the tip spring 11 are separated and in contact is equivalent to the state in which the switch 13 is connected to terminals a and b, respectively.

First, using a television receiver having a terminal plate 19 on the back side, connect the VHF75Ω plug 7 to the VHF75Ω terminal 20 and connect the UHF parallel two-wire feeder line 5 to the UHF300Ω terminal 18, then the tip spring 11 connects to the outer contact 8 and electrically. At the same time, the break terminal 10 and the chip spring 11 are separated by the elasticity of the chip spring 11. In other words, the switch 13 is connected to the a terminal, and the coaxial cable 6 and the VHF conversion transformer 12
The signal line between them is cut. For example, a UHF/VHF mixed signal output from a video tape recorder is transmitted via a coaxial cable to the input terminal 1.
The UHF/VHF mixed signal is separated into a UHF signal and a VHF signal by a separation filter 2. The separated UHF signal is transferred to UHF conversion transformer 3.
The impedance is converted from 75Ω to 300Ω by the UHF parallel two-wire feeder line 5.
Input to UHF300Ω terminal 18. Further, the VHF signal separated and transmitted by the coaxial cable 6 is inputted to the VHF75Ω terminal 20 via the center contact 9, in other words, via the switch 13 connected to the a terminal, without being subjected to impedance conversion.
This allows the viewer to view desired UHF or VHF programs using the tuner of the television receiver.

Next, using a television receiver with a terminal plate 16 on the back, connect the VHF parallel two-wire feeder line 15.
When connected to the VHF 300Ω terminal 17 and the UHF parallel two-wire feeder line 5 to the UHF 300Ω terminal 18, the break terminal 10 and the tip spring 11 come into contact due to the elasticity of the tip spring 11, in other words, the switch 13 is connected to the b terminal. Then, the signal line between the coaxial cable 6 and the VHF conversion transformer 12 is connected. When the UHF/VHF mixed signal is transmitted via a coaxial cable and input to the input terminal 1, the UHF/VHF mixed signal is separated into a UHF signal and a VHF signal by a separation filter 2. The separated UHF signal is converted by UHF conversion transformer 3.
Impedance converted from 75Ω to 300Ω, UHF
It is input to the UHF 300Ω terminal 18 via the parallel two-wire feeder line 5. Further, the VHF signal separated and transmitted by the coaxial cable 6 is converted from 75Ω to 300Ω by the VHF conversion transformer 12 via the break terminal 10 and the tip spring 11, in other words, via the switch 13 connected to the b terminal. The impedance is converted and input to the VHF 300Ω terminal 17 via the VHF parallel two-wire feeder line 15. From this, the viewer can view the desired UHF or VHF program in the same way as described above. (Refer to Utility Model Application No. 62-15195) (c) Problems to be solved by the invention However, in the case of the above-mentioned conventional technology, the UHF/VHF adapter shown in Fig. 4 has a VHF75Ω
A television receiver equipped with a terminal board 19 having a terminal 20 and a UHF 300Ω terminal 18, and a
It can be used for television receivers equipped with a terminal board 16 having a VHF 300Ω terminal 17 and a UHF 300Ω terminal 18, but cannot be used for a television receiver equipped with a terminal board equipped with a UHF/VHF 75Ω mixed terminal on the back. . In addition, in order to manufacture the UHF/VHF adapter, two types and two storage members 4 and 14 molded with resin are required.
Two types and two molds are required, and the coaxial cable 6 is also required, so the coaxial cable 6 is separated by a separation filter 2 and a center contact 9.
This resulted in problems such as increased costs and reduced workability.

(d) Means for solving the problems The present invention was made to solve the problems mentioned above, and it
When connected to the VHF75Ω mixed terminal, the UHF/VHF mixed signal transmitted via the coaxial cable is transmitted as described above.
UHF/VHF input to UHF/VHF75Ω mixed terminal
When the VHF75Ω mixed plug and the UHF/VHF75Ω mixed plug are not connected to the UHF/VHF75Ω mixed terminal, transmission is made via the coaxial cable.
A separation filter that separates a UHF/VHF mixed signal into a UHF signal and a VHF signal, and converts the impedance of the UHF signal obtained by the separation filter from 75Ω to 300Ω, and connects it to a television via a UHF parallel two-wire feeder line. When connected to the UHF conversion transformer input to the UHF 300Ω terminal of the receiver and the VHF 75Ω terminal of the television receiver, the VHF signal obtained by the separation filter is converted to the
VHF75Ω plug for input to VHF75Ω terminal,
When the VHF75Ω plug is not connected to the VHF75Ω terminal, the voltage obtained by the separation filter
A VHF conversion transformer that converts the impedance of a VHF signal from 75Ω to 300Ω and inputs it to the VHF300Ω terminal of a television receiver via a VHF parallel two-wire feeder line, and the UHF/VHF75Ω
The mixing plug, the separation filter, the UHF conversion transformer, the VHF75Ω plug, and the VHF
The above problem is solved by a single housing member that houses the conversion transformer.

(e) Effect According to the present invention, the integrated UHF/VHF adapter can be used with a television receiver having a VHF75Ω terminal and a UHF300Ω terminal, and a VHF300Ω terminal and a television receiver having a VHF75Ω terminal and a UHF300Ω terminal.
A television receiver with a UHF 300Ω terminal,
Can be used with television receivers that have a UHF/VHF75Ω mixed terminal, and can also be used with UHF/VHF75Ω
Mixing plug, separation filter, UHF conversion transformer,
The VHF75Ω plug and VHF conversion transformer are housed in a single housing member.

(f) Examples The details of the present invention will be explained in detail with reference to illustrated examples.

Figure 1 is a diagram showing the integrated UHF/VHF adapter of the present invention, Figure 2 is a block diagram of the main parts of Figure 1,
FIG. 8 is a diagram showing the terminal board provided on the back of the television receiver, and the figure number and structure are explained as follows.
21 is a coaxial cable that transmits a UHF/VHF mixed signal output from a video tape recorder, 1 is an input terminal connected to the coaxial cable 21, 22 is a terminal board having a UHF/VHF75Ω mixed terminal 23, and 24 is a VHF75Ω It has the same configuration as the plug 7, and the UHF/VHF 75Ω mixed terminal 23
UHF/VHF75Ω mixed plug connected to, 25
is a switch connected to the c terminal and the d terminal, 26
is a single housing member molded with resin to house the UHF/VHF75Ω mixing plug 24, separation filter 2, UHF conversion transformer 3, VHF75Ω plug 7, and VHF conversion transformer 12. The same elements as in Figures 3 to 5 are given the same figure numbers, and the break terminal (not shown) and tip spring (not shown) of the UHF/VHF 75Ω mixed plug 24 are spaced apart and in contact with each other. The state is equivalent to the state in which the switch 25 is connected to the c and d terminals, respectively.

First, using a television receiver with a terminal board 19 on the back, connect the VHF75Ω plug 7 to the VHF75Ω terminal 20 and connect the UHF parallel two-wire feeder line 5 to the UHF300Ω terminal 18. The break terminal 10 and the tip spring 11 are separated, in other words, the switch 13
is connected to terminal a, separation filter 2 and VHF
The signal line between the conversion transformers 12 is cut off.
For example, when a UHF/VHF mixed signal output from a video tape recorder is transmitted via the coaxial cable 21 and input to input terminal 1, the UHF/VHF signal is output from a video tape recorder.
The break terminal and tip spring of the VHF75Ω mixing plug 24 are in contact, in other words, the switch 25 is
Since the UHF/VHF mixed signal is connected to the d terminal, the UHF/VHF mixed signal is separated into a UHF signal and a VHF signal by the separation filter 2 via the switch 25 connected to the d terminal. The impedance of the separated UHF signal is converted from 75Ω to 300Ω by the UHF conversion transformer 3, and inputted to the UHF 300Ω terminal 18 via the UHF parallel two-wire feeder line 5. separated again
The VHF signal is transmitted via center contact 9.
In other words, the impedance is not converted through the switch 13 connected to the a terminal.
Input to VHF75Ω terminal 20. From this point on, the viewer can watch the desired UHF or VHF program using the tuner of the television receiver.

Next, using a television receiver equipped with a terminal plate 16 on the back, connect the VHF parallel two-wire feeder line 15.
When connected to the VHF 300Ω terminal 17 and the UHF parallel two-wire feeder line 5 to the UHF 300Ω terminal 18, the break terminal 10 and the tip spring 11 come into contact due to the elasticity of the tip spring 11, in other words, the switch 13 is connected to the b terminal. The signal line between the separation filter 2 and the VHF conversion transformer 12 is connected. When the UHF/VHF mixed signal is transmitted through the coaxial cable 21 and input to the input terminal 1, the UHF/VHF mixed signal is transmitted to the UHF signal and the VHF signal by the separation filter 2 via the switch 25 connected to the d terminal. Separated into signals. The separated UHF signal is converted by UHF conversion transformer 3.
Impedance converted from 75Ω to 300Ω, UHF
It is input to the UHF 300Ω terminal 18 via the parallel two-wire feeder line 5. The separated VHF signal is converted from 75Ω to 300Ω by the VHF conversion transformer 12 via the break terminal 10 and the chip spring 11, in other words, via the switch 13 connected to the b terminal.
The impedance is converted into the VHF parallel two-wire feeder line 15 and input to the VHF 300Ω terminal 17. From this point on, the viewer can select the desired
You can watch UHF and VHF programs.

Next, using a television receiver with a terminal board 22 on the back, connect the UHF/VHF 75Ω mixed plug 24.
When connected to the UHF/VHF 75Ω mixed terminal 23, the break terminal and the tip spring are separated by the elasticity of the tip spring, in other words, the switch 25 is connected to the c terminal. When the UHF/VHF mixed signal is transmitted via the coaxial cable 21 and input to the input terminal 1, the UHF/VHF mixed signal is transmitted via the center contact (not shown) without being input to the separation filter 2. Then, the signal is input to the UHF/VHF 75Ω mixed terminal 23 via the switch 25 connected to the c terminal. From this, the viewer can view the desired UHF or VHF program in the same way as described above.

From the above, the integrated UHF/VHF adapter of the present invention can be used for a television receiver having the terminal plate 16 shown in FIG. 6 on the back side, a television receiver having the terminal plate 19 shown in FIG. It can be used for a television receiver having the terminal plate 22 shown in FIG. , only one type and one molding die is required, which reduces costs and improves workability. Note that it is also possible to directly connect the coaxial cable 21 inside the storage member 26 and eliminate the input terminal 1, thereby further reducing costs.

(g) Effects of the invention According to the invention, an integrated UHF/VHF adapter can be used with a television receiver having a VHF 75Ω terminal and a UHF 300Ω terminal, and a VHF 300Ω terminal and a television receiver having a VHF 75Ω terminal and a UHF 300Ω terminal.
A television receiver with a UHF 300Ω terminal,
Since it can be used with television receivers that have a UHF/VHF75Ω mixed terminal, the range of use is expanded and the utilization rate is improved.In addition, the UHF/VHF75Ω mixed plug, separation filter, UHF conversion transformer,
Since the VHF75Ω plug and the VHF conversion transformer are housed in a single housing member, the number of housing members is reduced compared to the past, resulting in lower costs and improved workability.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the integrated UHF/VHF adapter of the present invention, Figure 2 is a block diagram of the main parts of Figure 1,
Figure 3 is a diagram showing a conventional UHF/VHF adapter, Figure 4 is a circuit diagram of the main part of Figure 3, and Figure 5 is a diagram showing a conventional UHF/VHF adapter.
Main part block diagram of the figure, Fig. 6, Fig. 7, and Fig. 8.
The figure shows a terminal board provided on the back of a television receiver. 2...Separation filter, 3...UHF conversion transformer, 5...UHF parallel two-wire feeder line, 7...
VHF75Ω plug, 12...VHF conversion transformer,
15...VHF parallel two-wire feeder line, 17...
VHF300Ω terminal, 18...UHF300Ω terminal, 20
...VHF75Ω terminal, 21 ...Coaxial cable, 2
3...UHF/VHF75Ω mixed terminal, 24...
UHF/VHF75Ω mixed plug, 26...Storage component.

Claims (1)

[Claim for Utility Model Registration] When connected to the UHF/VHF 75Ω mixed terminal of a television receiver, the UHF/VHF mixed signal obtained from the input terminal to which the coaxial cable that transmits the UHF/VHF mixed signal is connected. Said UHF/
UHF/VHF75Ω input to VHF75Ω mixed terminal
and the UHF/VHF75Ω mixed plug is the UHF/VHF 75Ω mixed plug.
A separation filter that separates the UHF/VHF mixed signal transmitted by the coaxial cable into a UHF signal and a VHF signal when not connected to the VHF75Ω mixed terminal, and a separation filter that separates the UHF signal obtained by the separation filter into a 75Ω
The impedance of the television receiver is changed from
When the UHF conversion transformer input to the UHF300Ω terminal is connected to the VHF75Ω terminal of the television receiver, the signal obtained by the separation filter
a VHF75Ω plug for inputting a VHF signal to the VHF75Ω terminal and protruding in a direction different from the extending direction of the coaxial cable, the UHF parallel two-wire feeder wire, and the UHF/VHF75Ω mixed plug; Obtained by the separation filter when not connected to the terminal
A VHF conversion transformer that converts the impedance of a VHF signal from 75Ω to 300Ω and inputs it to the VHF 300Ω terminal of the television receiver via a VHF parallel two-wire feeder line extending parallel to the UHF parallel two-wire feeder line. and the UHF/VHF75Ω mixed plug, the separation filter, the UHF conversion transformer, and the VHF75Ω
An integrated type comprising a plug and a single housing member housing the VHF conversion transformer.
UHF/VHF adapter.