JPH02309578A - Jack - Google Patents

Abstract

PURPOSE:To automate the connection and the cutting-off of the terminal resistance by earthing the connection terminal of a jack through a switch to turn off when a plug is connected and to turn on when the plug is not connected, and an electric resistance of a specific resistance value. CONSTITUTION:By inserting the plug contact 22 of a plug 11 to the inserting hole 15c of a jack 10, a rod 17 is moved to separate a ring 17a from a projection 16a and an electrode 19, a switch is made in the OFF condition, and a jack 16 is made into the condition to give no terminal resistance. And when the plug 11 is removed, the rod 17 is moved being enforced by a spring 18, the projection 16a and the electrode 19 are made in a contacting condition through the ring 17a, and a terminal resistance is given to a leading line 12a by an electric resistance 20. In such a way, since a terminal resistance is given to the jack contact 16 when the plug 11 is removed from the jack 10, while the electric resistance 20 is cut off and a normal connecting condition is obtained when the plug 11 is installed, the work can be carried out simply, and even though the worker has no detailed knowledge, he can use the jack in a correct condition.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an improvement in a jack to which a plug is connected, and in particular, a normal connection state is obtained when the plug is connected, and a normal connection state is obtained when the plug is removed. , the terminating resistance is automatically provided.

[Conventional technology]

When you remove the plug from a jack installed on video equipment, audio equipment, etc. that inputs and outputs high-frequency signals, leaving the jack open may cause impedance mismatch or electromagnetic noise on the equipment side. There is a problem in that various obstacles occur.

Conventionally, the above-mentioned problem has been solved by attaching a cap 2 that provides a terminating resistor to the jack l from which the plug is removed, as shown in FIG. 2, for example. That is, the cap 2 has a plug contact 2a that fits into the jack contact 1a of the jack 1, and this plug contact 2a is grounded via an electric resistor 3. For example, when the cap 2 is attached to the jack 1 by screwing together the male screw 1b formed on the jack l and the female screw 2b formed on the cap 2, the jack contact 1a is connected to the plug contact 2a and the electric Since it is grounded through the resistor 3, the jack 1 is provided with an appropriate terminating resistance.

[Problem to be solved by the invention]

However, according to the conventional solution as described above, it is necessary to remove the plug and attach the cap 2 when providing a termination resistor to the jack 1, and when connecting the jack 1 and the plug, it is necessary to remove the plug and attach the cap 2. Since it is necessary to remove the cap 2 and attach the plug, it is not only time-consuming, but also causes problems such as forgetting to attach the cap 2 (in some cases, the user may not know that it is necessary).

In particular, in recent years, even ordinary people without detailed knowledge frequently use equipment such as video equipment and audio equipment, so the above-mentioned problems tend to increase.

Therefore, this invention was made by focusing on the problems that need to be solved with the conventional technology. When a plug is attached, an electrical connection is made between the plug and the jack, and when the plug is removed, The purpose of the present invention is to provide a jack to which a termination resistance is automatically applied.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a jack equipped with a connecting terminal to which a plug is connected, which has a switch that turns the connecting terminal off when the plug is connected and turns on when the plug is not connected. and grounded via an electrical resistance having a predetermined resistance value.

[Effect]

When the plug is connected, the switch is turned off, so
The connection terminal of the jack and the ground are disconnected. Therefore, the plug and jack are in a normal connection state.

Then, when the plug is removed, the switch is turned on, so that the connection terminal of the jack is grounded through an electrical resistance having a predetermined resistance value. Therefore, the jack is provided with a terminating resistor.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a sectional view showing an embodiment of the present invention.

First, the configuration will be explained.

That is, the jack 10 is used as a connection port for a plug 11 by being fixed to a casing 12 of, for example, an audio device.

The jack 10 has two threaded parts 10b and loc formed on the outer periphery of a cylindrical main body 10a, and a nut 14 screwed into one of the threaded parts 10b and a threaded part tab and loc formed between the two threaded parts 10c. It is fixed to the casing 12 by sandwiching the casing 12 between the protrusion 10d.

An insulator 15 is provided inside the main body 10a and has two cavities 15a and 15b that penetrate in the axial direction. A jack contact 16 serving as a connection terminal is buried therein, and the other end thereof is connected to a conductive wire 12a.

The tip of the jack contact 16 is made of, for example, a resilient plate material, and is curved outward to guide the fitting of a plug contact, which will be described later, and also fits into the insertion hole of the insulator 15. We are facing 15c.

Further, a metal rod 17 whose tip end is located in the cavity 15a and can move forward and backward is inserted into the insulator 15.
a and one end surface of the cavity 15b, the spring 18 is biased toward the cavity 15a.

Therefore, when no external force is applied to the rod 17, the rod 17 is displaced to a position where the ring 17a abuts the other end surface of the cavity 15b (ie, the state shown in FIG. 1).

Further, an electrode 19 is embedded in the insulator 15, and one end of the electrode 19 is connected to the ring 17a of the rod 17 when it is most displaced toward the cavity 15a (that is, in the state shown in FIG. 1).
The other end is connected to the main body 10a via an electrical resistor 20 having a predetermined resistance value.

The jack contact 16 is provided with a protrusion 16a that contacts the ring 17a of the rod 17 when the jack contact 16 is displaced most toward the cavity 15a.

Therefore, when no external force is applied to the rod 17, the jack contact 16 is connected to the electrode 19 via the ring 17a.

On the other hand, the plug 11 corresponding to the jack 10 is attached to the tip of the coaxial cable 21, for example, and has an inner end connected to a conductive wire (not shown), and a tip inserted into the insertion hole 15c of the jack 10 and connected to the jack contact 16. The mating plug contact 22 and this plug contact 2
2, and a nut 24 which is prevented from being pulled out by a protrusion 21a formed at the tip of the coaxial cable 21 and which is screwed into the threaded part 10c of the jack 10.

Here, in the above embodiment, the protrusion 16a.

Rod 17. The ring 17a, the spring 18, and the electrode 19 constitute a switch that is turned off when the plug 11 is connected and turned on when it is not connected.

Next, the operation of the above embodiment will be explained.

Assuming that the plug 11 is now removed from the jack 10 (that is, the state shown in FIG. do.

That is, since the switch is in the on state, the conductor 12a is connected to the jack contact 16. Protrusion 16a.

It is connected to one end of an electrical resistance of 2° via the ring 17a and the electrode 19. Also, the other end side of the electrical resistance 2o is the main body 1
Since it is in a grounded state via 0a and the casing 12,
In the end, a terminating resistor is provided to the conductor 12a,
This prevents failures such as impedance mismatching from occurring in equipment connected to the other end (not shown) of the conducting wire 12a.

To connect the plug 11 to the jack 10, first displace the nut 24 to the right in FIG. 1 to expose most of the tip of the plug contact 22. Insert into hole 15c.

The plug contact 22 inserted into the insertion hole 15c moves while pushing and expanding the tip of the jack contact 16,
It comes into contact with the tip of the rod 17.

Therefore, when the plug contact 22 is further inserted, the rod 17 moves to the left in FIG. 1 while resisting the biasing force of the spring 18, so the ring 17a separates from the protrusion 16a and the electrode 19, that is, the switch is turned off. Become.

Thereafter, by fastening the nut 24 to the threaded portion 10c, the connection between the jack 10 and the plug 11 is completed. Note that when inserting the plug contact 22, the nut 24 is inserted into the protrusion 21.
The plug contact 22 can be easily inserted by screwing the plug contact 22 into the threaded portion 10c and tightening the plug contact 22 while the plug contact 22 is engaged with the screw portion 10c.

In this state, since the switch is off, the jack contact 16 is ungrounded (that is, no terminating resistor is provided), and the conductor t2a is connected via the jack contact 16 and the plug contact 22. Since the coaxial cable 21 is connected to a conductive wire (not shown) of the coaxial cable 21, signals can be transmitted and received without any problem.

Furthermore, when the plug 11 is removed from this state, the rod 17 is biased by the spring 18 and moves to the state shown in FIG. As described above, the electrical resistance 20 provides a terminating resistance to the conductive wire 12a.

In this way, in the above embodiment, when the plug 11 is removed from the jack lO, the jack contact 1
6 (that is, the device side where the jack 11 is provided) is provided with an appropriate terminating resistance, and when the plug 11 is attached, the jack contact 16 is disconnected from the electrical resistance 20 and becomes ungrounded. Therefore, a normal connection status can be obtained.

In other words, tasks that were previously time-consuming can be performed very easily. As a result, even a person without detailed knowledge can use the device in the correct condition.

Therefore, the jack 10 according to the present invention can be suitably used in equipment that transmits and receives high frequency signals, such as video equipment and audio equipment.

[Effects of the Invention] As explained above, according to the present invention, when the plug is removed from the jack, an appropriate terminating resistance is provided to the equipment on the jack side, and when the plug is attached, the normal terminal resistance is applied. Since the connection state can be obtained, it has the effect of making it possible to perform tasks that were previously time-consuming, and as a result, even people without detailed knowledge can
Can be used in correct condition.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional technique. 0...Jack, 10a...Body, 11...Plug, 16...Jack contact (connection terminal), 1
6a...Protrusion, 17...Rod, 17a...Ring, 18...Spring, 19...Electrode, 20...
・Electrical resistance, 22...Plug contact.

Claims (1)

[Claims] (1) In a jack equipped with a connecting terminal to which a plug is connected, the connecting terminal is connected to a switch that is turned off when the plug is connected and turned on when the plug is not connected, and an electric resistance having a predetermined resistance value. Jack characterized by being grounded.