JPH045119Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field This invention relates to a VTR connection adapter suitable for use in connecting a VTR set and the main body of a television receiver (TV).
When connecting to a parallel two-wire feeder for TVs with different input impedances, by providing a connecting means with a switching mechanism that is simple and easy to handle, it is possible to quickly and reliably connect the VTR set to the TV. Concerning a VTR connection adapter that enables connection with the main unit.

Prior Art In general, TVs use two types of antenna terminals for input from a receiving antenna: a 300Ω parallel two-wire feeder and a 75Ω coaxial cable.

However, the output of the VTR set is a 75Ω coaxial cable.

Therefore, when connecting a VTR set and a TV, if the TV's antenna terminal is for a 300Ω parallel two-wire feeder, a connection adapter with a built-in balun transformer for impedance conversion is required. It becomes necessary.

Figures 3 1 and 2 are diagrams showing an example of the configuration of a conventional adapter for connecting a TV main body and a VTR set. It is a top view of the connection adapter for. In the drawing, 21 is
21A is the adapter body, 21B is the parallel two-wire feeder assembly, 21C is the receptacle, 22 is the VTR connection cable, 22A is the coaxial cable, 2
2B indicates a plug.

Conventional VTR sets have a 300Ω parallel two-wire feeder connection antenna terminal as shown in Figure 3, 1 and 2, so that connection is possible even when the TV body is equipped with an antenna terminal for connecting a 300Ω parallel two-wire feeder. A VTR connection cable 22 and a VTR connection adapter 21 are attached.

As shown in FIG. 3, the VTR connection cable 22 has plugs 22 at both ends of the coaxial cable 22A.
B is connected.

In addition, the adapter main body 21A has a built-in balun transformer for impedance replacement, as shown in FIG.
Receptacles 21C for 75Ω coaxial cables are connected to each.

The user must confirm that the antenna terminal of the TV they wish to connect to is
When using a 75Ω coaxial cable, the output terminal of the VTR set and the antenna terminal of the TV are connected through this VTR connection cable 22 shown in FIG. 3.

On the other hand, when the TV antenna terminal is for a 300Ω parallel two-wire feeder, the connection cable 22 and VTR connection adapter 21 are used to connect the output terminal of the VTR set and the TV antenna terminal. .

In other words, VTR connection cable 2 in Fig. 3 2
2 plug 22B to VTR connection adapter 21
Connect to the receptacle 21C of the parallel two-wire feeder assembly 21B of the connection adapter 21.
Match the input impedance by connecting to the TV's 300Ω antenna terminal through the connector.

In this way, users of the VTR set can
Depending on the type of antenna terminal of the TV that you wish to use in connection, you may use the VTR connection cable 22 alone or a combination of the VTR connection cable 22 and the VTR connection adapter 21.

For example, if you have two TVs, each antenna terminal has one for a 300Ω parallel two-wire feeder and one for a 75Ω
For coaxial cables, users can
Depending on the antenna terminal, the VTR connection adapter 21 may or may not be used.

Therefore, especially in such cases,
There was an inconvenience in that unless the VTR connection adapter 21 was stored carefully, the VTR set could not be connected to a TV equipped with a 300Ω parallel two-wire feeder antenna terminal.

Purpose The VTR connection adapter of this invention solves these inconveniences with conventional connection adapters, and integrates a connection adapter with a built-in balun transformer for impedance conversion into a coaxial cable and parallel two-wire feeder. We aim to provide a connection adapter for VTR that can be used immediately when needed, and that can be quickly connected by simply inserting a plug when in use. purpose.

Configuration The present invention includes a box-shaped molded case 8 and a molded cap 9, which constitute a pair of thin box-shaped storage parts, and the storage part includes a solder terminal 11, a balun transformer 6, and a 75Ω A printed circuit board 10 on which a plug section for the purpose and a circuit section for connecting these are formed.
is stored at one end of the joining surface of the mold case 8 and the mold cap 9, and at the other end.
It has a hole for the coaxial cable 1 to which a 75Ω plug is connected, and has a hole for the parallel two-wire feeder of the parallel two-wire feeder assembly 7 at the other end opposite to the one end, The molded case 8 has a center contact 2 on a non-bonded surface with the molded cap 9,
It is provided with a 75Ω plug part consisting of an outer contact 3, a tip spring 4, and a break terminal 5, and connects the coaxial cable 1 and the 75Ω plug part, and when the plug part is not attached to the receptacle, the The coaxial cable 1 and the parallel two-wire feeder assembly 7 are connected to the tip spring 4 of the plug section, the break terminal 5, and the balun transformer 6.
When the plug portion is attached to the receptacle, the tip spring 4 and the break terminal 5 are brought into a non-contact state by the receptacle, thereby connecting the parallel two-wire feeder assembly 7. I am trying to disconnect from the other side.

Next, one embodiment of the VTR connection adapter of this invention will be described in detail with reference to the drawings.

FIG. 1 is a circuit diagram showing the main structure of the VTR connection adapter of this invention. In the drawing,
1 is a coaxial cable with a 75Ω plug connected to the other end, 2 is a center contact, 3 is an outer contact, 4 is a tip spring, 5 is a break terminal,
6 is a balun transformer, 7 is a parallel two-wire feeder.
The assembly is shown.

As shown in FIG. 1, the VTR connection adapter of this invention has a coaxial cable 1 whose other end is connected to the output terminal of the VTR set, a center contact 2, an outer contact 3, a tip spring 4, and a break terminal 5. composed of 75Ω
A plug for 75Ω, a balun transformer 6, and a parallel two-wire feeder assembly 7 are provided to connect the coaxial cable 1 and the plug for 75Ω. 1) is a state in which the coaxial cable 1 and the parallel two-wire feeder assembly 7 are connected to each other.
are connected to each other via a tip spring 4 of the plug, a break terminal 5 and a balun transformer 6.

On the other hand, when this 75Ω plug is attached to a receptacle, the receptacle makes the tip spring 4 of the plug and the break terminal 5 non-contact, so that the coaxial cable 1 and the parallel two-wire It operates so that the connection with the feeder assembly 7 side is cut off. As a result, the core wire of the coaxial cable 1 is connected only to the center contact 2 of the 75Ω plug. In addition,
Outer contact 3 is grounded.

Figs. 2 1 to 5 are structural diagrams showing an embodiment of the VTR connection adapter of this invention, Fig. 1 is a front view, Fig. 2 is a left side view of the main part, Fig. 3 is a rear view of the main part, and Fig. 4 5 is a partially cutaway side view of the main part, and FIG. 5 is a rear view of the main part with the cap removed. Reference numerals in the drawings are the same as in FIG. 1, and 8 is a mold case, 9 is a mold cap, 10 is a printed circuit board, and 11 is a solder terminal.

As shown in FIGS. 1 to 5, the 75Ω plug is composed of a center contact 2, an outer contact 3, a tip spring 4, and a break terminal 5.

On the printed circuit board 10, wiring constituting the necessary circuit is carried out, and in addition to these center contact 2, outer contact 3, chip spring 4, and break terminal 5, there is a balun transformer 6, and a coaxial cable 1. A solder terminal 11 for connecting and fixing the wire, a parallel two-wire feeder assembly 7, etc. are attached.

The VTR connection adapter of this invention is comprised of such parts and is housed in a suitable case consisting of a molded case 8 and a molded cap 9.

As already explained, the contact/non-contact operation between the tip spring 4 and break terminal 5 on the 75Ω plug is automatically performed by the receptacle attached to this plug, and when attached, the coaxial cable 1 and The connection with the parallel two-wire feeder assembly 7 side is cut off, and the operation is performed so that only the coaxial cable 1 and the plug are connected.

In this way, with the VTR connection adapter of this invention, by configuring the VTR connection adapter in one piece, the adapter body with a built-in balun transformer for impedance conversion is not isolated, unlike conventional connection adapters. It is available immediately when the user needs it.

In addition, the balun transformer for impedance conversion is integrated with the adapter body, and the circuit can be switched by simply attaching the plug to the TV antenna receptacle.

Effects Therefore, according to the VTR connection adapter of this invention, when connecting two types of TV bodies with different antenna terminal impedances, 75Ω and 300Ω, and a VTR set with an output terminal of 75Ω, the TV antenna terminal Depending on the type of antenna, you can choose whether to attach a 75Ω plug to the receptacle of the antenna terminal or connect it to the parallel two-wire feeder assembly side.Especially when the plug is attached to the receptacle, Since the circuit is automatically switched by the receptacle, the installation operation is extremely simple.

Moreover, the adapter body has a built-in balun transformer and is integrated with the coaxial cable and two-wire feeder, so there is no storage trouble such as losing the adapter body, and it can be used immediately when needed. It is.

Furthermore, since its configuration requires the same minimum number of parts as conventional connection adapters, it has many excellent practical effects, such as being advantageous in terms of cost.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing the main structure of the VTR connection adapter of this invention, and Figs. 2 1 to 5 are structural diagrams showing one embodiment of the VTR connection adapter of this invention. Fig. 1 is a front view; Figure 2 is a left side view of the main part, Figure 3
is a rear view of the main part, Fig. 4 is a partially cutaway side view of the main part, Fig. 5
Figure 3 is a rear view of the main parts with the cap removed; Figures 3 1 and 2 are diagrams showing an example of the configuration of a conventional adapter for connecting a TV main unit and a VCR set; Circuit diagram, Figure 2
is a plan view of a VTR connection cable and a VTR connection adapter. In the drawings, 1 is a coaxial cable, 2 is a center contact, 3 is an outer contact, 4 is a tip spring, 5 is a break terminal, 6 is a balun transformer, and 7 is a parallel two-wire feeder assembly.

Claims (1)

[Claims for Utility Model Registration] Comprising a square-shaped molded case 8 and a molded cap 9, which constitute a pair of thin box-like storage parts, the storage part includes a solder terminal 11, a balun transformer 6, A printed circuit board 10 on which a 75Ω plug part described later and a circuit part for connecting these parts are formed.
is stored at one end of the joining surface of the mold case 8 and the mold cap 9, and at the other end.
It has a hole for the coaxial cable 1 to which a 75Ω plug is connected, and has a hole for the parallel two-wire feeder of the parallel two-wire feeder assembly 7 at the other end opposite to the one end, The molded case 8 has a center contact 2 on a non-bonded surface with the molded cap 9,
It is provided with a 75Ω plug part consisting of an outer contact 3, a tip spring 4, and a break terminal 5, and connects the coaxial cable 1 and the 75Ω plug part, and when the plug part is not attached to the receptacle, the The coaxial cable 1 and the parallel two-wire feeder assembly 7 are connected to the tip spring 4 of the plug section, the break terminal 5, and the balun transformer 6.
When the plug portion is attached to the receptacle, the tip spring 4 and the break terminal 5 are brought into a non-contact state by the receptacle, thereby connecting the parallel two-wire feeder assembly 7. A VTR connection adapter that is characterized by disconnecting from the side.