JPS5940477A - Lead-in plug - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention is directed to reducing noise signals that enter the equipment via a power cord in audiovisual equipment such as a television receiver.

A choke coil was installed inside as a filter. Regarding the plug.

[Technical background of the invention and its problems]

For example, in a television receiver, internal wiring, circuit elements, etc. (2) If interference radio waves with a wide range of frequency components are radiated, it may have an adverse effect on the quality of the image reception and sound quality. In order to prevent noise signals from entering the circuit, measures are taken such as installing shields on each circuit element and noise filters on each circuit. In some cases, the power cord itself becomes an antenna, and interference radio waves may flow into the circuitry inside the device via the power line.To prevent this, a filter such as a coil may be installed inside the power cord plug. .

Figure 1 shows one of the conventional examples in which a choke coil is installed as a filter in the plug of the power cord. Conductor 111 of coil 121
One end is connected to the terminal part 141 of the electrode blade 131 with solder or the like, and the other end' is connected to one of the lead wires 151 of the power supply coat "15." Similarly, a choke coil composed of the magnetic material 102 and the conductive wire ZXZ is connected. 122 has one end of its conducting wire 112 connected to the terminal portion 142 of the electrode blade 132, and the other end connected to another lead wire 152 of the power cord I5. 'l
2. Therefore, they are fixed side by side to the main body 17I of the T-shaped holder 17. Also, the electrode blades 131 and 132.

Each terminal part 141, 142 is attached to a T-shaped holder 1.
The head 172 of the electrode blade 131, 132 is integrally fixed (two molded and fixed). At this time, in order to prevent the lead wires 151 and 152 of the power cord 15 from breaking due to external force applied to the power cord 15 during use, the power cord 15 is
．． A portion of the covering member 152 is covered by the insulator of the plug body I8.

Note that, as the insulating member forming the plug body 1B, a flexible material such as vinyl chloride is used to prevent damage due to dropping or the like. Further, by using a flexible material as the insulating member in this manner, the flexibility of the portion of the power cord 15 that is pulled out from the plug body 18 is improved. This 1: From leader line 151
．． There is an advantage that external force is less likely to be directly transmitted to the connection portion between 152 and the conductive wires Ill and 112, and disconnection in this portion can be suppressed as much as possible.

However, in the case of the above configuration, the insulating member forming the plug body 18 has flexibility.

The following problems arose due to the use of different materials. In other words, 1. For example, when inserting the plug into or removing it from the outlet, the second f-lug main body 18
When force E as shown in figure (a+) is applied, holder 1
Since 7 is T-shaped, the main part 17 of this holder 17
The area around 1 tends to be greatly deformed. As a result, as shown in Figure 2 (b+), tension was applied to the soldered parts A between the conductor wires III and 112 and the electrode blades 131 and 132 or the lead wires 151 and 152, resulting in an accident that caused these parts to break. was likely to occur. Also, the magnetic material 101
, 102 are made of a material that has low durability against external forces and is easily broken, so when the above-mentioned external force is applied and the plug body is deformed, the magnetic bodies 101 and 102 will break and lose their function. There were also accidents where the length became too long. Moreover, when the above-mentioned deformation occurs, the insulating member is damaged by the main part 1 of the hole-17.
There was also a problem in that the choke coils peeled off from the choke coils 71, deteriorating the insulation condition between the choke coils 121 and 122, and making it easier for electric discharges to occur. If the plug has been dropped.

When a shock was applied to the magnetic body, the magnetic bodies 101 and 102 were sometimes broken.

FIG. 3 shows another example of the conventional plug, in which the electrode blade 13 does not use the holder 17 as shown in the previous example.
1,132, choke coils 21, 122, etc. are directly fixed and arranged with flexible thread-colored edges. In addition to the problems described in the previous example, such a configuration also has the following problems. That is, the choke coils 121 and 122 housed inside the f-rag main body 18 must be temporarily supported and fixed in the hollow part of the mold when the f-rag main body 18 is molded. For this reason, a receiving structure is provided in the mold, but
After molding, this portion of the receiving structure remains as a void, causing the inconvenience that the coil surface is exposed to the outside.

[Purpose of the invention]

This invention was made in order to eliminate the above-mentioned defects, and there is no risk of the connection wire inside the plug body breaking during molding, and it also increases the strength of the plug body, and the core of the choke coil housed inside the main body. This prevents damage to materials and disconnection of connecting wires.

The purpose is to provide plugs.

[Summary of the invention]

The plug according to the present invention has the following outline. That is, choke coils are arranged and connected between the electrode blades and the power supply port-to-door lead wire, respectively, and the tips of the electrode blades are made to protrude.

Preforming is performed using an insulator having one strength greater than that at a predetermined positional spacing. Furthermore, around this preformed insulator,
The plug is formed into a predetermined plug shape by surrounding molding using a flexible material.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 4, electrode blades 131 and 132 are connected to lead wires 151 and 152 of a power cord I5 via respective choke coils 121 and 122. Electrode blade 131,1
32 and the choke coils Z2Z, 122 (see FIG. 5) are covered and protected using heat shrink tubes 191 and 192, respectively, prior to the molding process. Similarly (connection wires 221, 222 connecting the Nite yoke coils 121, 122 and the lead wires 151, 152
(See FIG. 5) are also covered and protected by heat shrink tubes 201, 2021-. FIG. 5 is a view of the inside of the plug main body viewed from the xx direction in FIG. 4. For simplification, the state of the heat shrink tube on the leader line 151 side is shown as a straight sparrow.
This is an indication.

The heat shrink tubes 191 and 192 each have a terminal portion 141.
．． 142 and the core end of the choke coil, the connection wires 211 and 212 are covered and protected. As a result, the external force applied to the heat shrinkable tubes 191, 192 is distributed to the terminal portions 141, 142 and the core ends of the choke coils, and does not directly affect the connecting wires 211, 212. Similarly, the heat shrink tubes 201 and 202 that cover and protect the connecting wires 221 and 222 that connect the choke coils 121 and 122 and the lead wires 151 and 152 are used to protect the core ends of the choke coils 121 and 122 and the lead wires 151 and 152.
Constructed to protect, including a cladding.

The component configured as described above is preformed into a molded body 18 using an insulating material with high mechanical strength, such as epoxy, polyester, polyacetal, or the like.

In this molding process, the leader line 151.152 from the code 15
The part where is branched out is the choke coil 1 arranged in parallel.
21. It is placed deeper inside than the end of 122. The molded body 111A formed in this manner is further surrounded by, for example, soft vinyl chloride.

The outer layer part 18B is formed by surrounding molding using an impact energy-absorbing insulating material such as ethylene acetic acid copolymer or rubber.
and the specified plug shape.

In this way, (-) according to the double plug body structure, against a static external force such as bending, the 18 internal molded bodies generate a resistance to prevent damage to the choke coils 121 and 122. Also, epoxy and polyester constituting the molded body rsA.

Although polyacetal and the like have low impact energy absorption performance, the impact force generated when the plug body falls is absorbed by the outer layer portion 188, thereby preventing internal damage.

〔Effect of the invention〕

As described above, according to the present invention (the two-way plug), there is no risk of disconnection of the connection wire inside the plug body during molding of the plug body, so the product reliability is high. Due to the complementary effects of materials with different physical properties, the 5F plug body has high mechanical strength and good impact energy absorption performance, so it can prevent damage to the choke coil and connecting wires housed inside the body.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a conventional example, Figure 2 is a diagram showing the state of deformation when an external force is applied to the conventional plug shown in Figure 1, and Figure 3 is another conventional example. FIG. 4 is a plan view showing an example, FIG. 4 is a perspective view of the plug according to the present invention, and FIG. 5 is a perspective view of the plug according to the present invention. 5 is a diagram showing the inside of the plug seen from the x-x direction in FIG. 4. FIG. Z 2 f, Z 22-... Choke carp) Li,
131°132·°・Electrode blade, 141,142...Terminal part. 15...Power cord, 151,152...Leader wire. 18A...Molded object, 18B...Outer layer part, 18...
Plug body, 191, 192 pipes 201, 202
・!・Heat shrink tube. Figure 1 (a) (b) 344 Figure 3 Figure 4

Claims (1)

[Claims] An electrode blade connected to an outlet, one end of the winding connected to the electrode blade and the other end a power cord lead wire (two connected choke coils, and at least a part of the choke coil and the electrode blade covered) These choke coils and electrode blades are integrated into one body (2) a hard first insulator fixedly disposed, and a flexible first insulator provided to cover the outer peripheral surface of the first insulator. and a second insulator.