JPS6258085B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection cord suitable for a mold type stereo plug manufactured by resin molding, and a method for manufacturing the same.

Conventionally, cords used for stereo equipment are molded into two sets, a left channel cord and a right channel cord, and the left channel plug and right channel plug are connected and fixed at the end of the cord. . However, when connecting this connection cord to a stereo device, if the left and right channels are connected incorrectly, the sense of localization and bass sound will be hindered or deleted, making it impossible to obtain good reproduced sound.

Therefore, when connecting to a stereo device, great attention must be paid to the left and right sides of the connection plug, and to alleviate this, conventional plugs have various indicators to distinguish between the left and right channels. has been achieved.

The first method is to color the mold of the plug white or gray for the left channel and red for the right channel to distinguish between the left and right channels. In the second type, a concave mold is provided in the mold part of the plug, and the concave mold is impregnated and colored in a separate process with white or gray paint for the left channel, and red paint for the right channel. In the third type, a vinyl ring made of PVC or the like is inserted into the outer periphery of the mold of the plug, with the left channel colored white or gray and the right channel colored red. In the fourth method, the mold is divided into left and right channels, and different shapes are engraved on the left and right channels by recesses or protrusions.

However, in the first type, the color of the plug is limited, and if it is colored arbitrarily, it becomes impossible to distinguish between left and right channels, and in the second and third types, many manufacturing and assembly processes are required, making mass production difficult. It gets very bad. Moreover, especially in the third type, since the vinyl ring is inserted into the outer periphery of the mold, the vinyl ring may become dirty or damaged, making it impossible to distinguish between left and right during use. The fourth type requires separate left and right molds.

In view of the above-mentioned points, the present invention aims to provide a mold that can be arbitrarily selected in color, is easy to mass produce, and has an aesthetic appearance.

Embodiments of the present invention will be described in detail below with reference to the drawings. Reference numeral 1 denotes a connecting rod that is inserted into a plug jack, and 2 a connecting ring provided on the outer periphery of the connecting rod 1. The connecting rod 1 and the connecting ring 2 are insulated and held by an insulating support plate (not shown). Reference numeral 5 denotes a cord having a built-in conductor and a conductor (not shown). The conductor is connected to the connecting rod 1 and the conductor is connected to the connecting ring 2, and these are molded and fixed by the sleeve mold 3. A polarity display tube 4 is formed to be thicker than the outer diameter of the cord 5, and is inserted into the cord 5. The polarity display tube is made of a soft resin such as PVC, and is colored white or gray for the left channel, and red for the right channel. 6 is a plug mold, which is formed by inserting the polarity indicating tube 4 into the cord 5 and then heating and molding a soft resin. 6a is a polarity display window formed in the plug mold 6, through which the polarity display tube can be seen directly, and as can be seen from FIG. ing.

Next, the method of manufacturing the stereo connection plug described above will be described. First, the conductor in the cord 5 to the connection rod 1 and the conductor in the cord 5 to the connection ring 2 are connected and fixed, respectively, and kept insulated by the sleeve mold 3. Next, insert the polarity display tube 4 from the cord 5 side. At this time, insert a white or gray tube into the left channel plug and a red tube into the right channel plug.

In this state, it is set in a mold for plug molding, and a soft resin is injected into the mold. The color of this soft resin can be arbitrarily selected regardless of whether it is a left channel or a right channel. After the resin has hardened, the mold is removed and a plug mold 6 is formed. Further, the polarity display tube 4 is fixed to the cord 5 by the plug mold 6. Since the plug mold 6 has a polarity display window 6a, a part of the polarity display tube 4 can be seen directly from the outside, making it easy to distinguish and recognize whether it is a left channel plug or a right channel plug. can do.

As mentioned above, by coating the cord 5 with the polarity display tube made of soft resin and then injecting the soft resin for plug molding,
The polarity display tube is fitted onto the cord, and a plug mold is also formed. Also, since the plug mold 6 has a polarity display window 6a, the polarity display tube 4 can be easily viewed directly, and the left and right channels can be easily identified without misunderstanding. Furthermore, since the entire polarity display tube 4 is not exposed, the tube will not become dirty or damaged. In addition, the color of the plug mold is not limited as in the past, and it is highly mass-producible and has a beautiful appearance, and various plug mold shapes are possible, and there is no need to create separate molds for the left and right sides.

In the above embodiment, the same soft resin as the material of the plug mold 6 is used as the polarity display tube 4, and the polarity display tube 4 is made to be integrated with the cord 5 during molding, and the polarity display tube 4 is fitted onto the cord 5. However, it is not limited to this. For example, to indicate polarity, a colored heat-resistant vinyl tape is wrapped around it, a heat-shrinkable transparent tube is fitted onto it, and a plug mold is formed with a soft resin on top. The colored heat-resistant vinyl tape may be compressed to the cord 5 by shrinking. Also,
A heat-shrinkable polarity display tube may be used for polarity display, and the tube may be shrunk by the heat during plug molding and crimped onto the connection cord. Further, the polarity may be displayed not only by color but also by the presence or absence of a pattern such as a striped pattern, or by a different pattern.

As explained above, in the present invention, the colored identification member is fitted and attached to the cord, and the cord is covered with a molded member containing the identification member and having an open window. It has a unique structure that allows code identification and is excellent for mass production.
Since the mold member is tapered from the connecting member toward the cord side and has a large number of windows, the cord is not bent sharply from the connecting member, and has flexibility. This makes it easy to handle the cord and prevents internal lead wires from being cut.

[Brief explanation of the drawing]

The figures show one embodiment of the plug according to the present invention. Figure 1 is a perspective view of the polarity display tube before being covered, Figure 2 is a perspective view of the polarity display tube being coated and before the plug mold is formed, and Figure 3 is the finished product. FIG. 1... Connection rod, 2... Connection ring, 3... Sleeve mold, 4... Polarity display tube, 5... Cord, 6... Plug mold, 6a... Window.

Claims (1)

[Scope of Claims] 1. A connection part to an electronic device, a cord connected to the connection part by soldering, and a coloring etc. fitted and applied to a part of the cord near the connection part. A large number of windows are formed in at least a portion corresponding to the identification member so as to cover the outer periphery of the cord including the identification member from the cord side of the connection portion, and to view the identification member from the outside at least in a portion corresponding to the identification member. A connecting cord comprising a molded member tapered from the connecting portion toward the cord side. 2. The first part that connects the cord to the connection part to the electronic device.
and a second step of fitting and attaching an identification member colored or the like to a portion of the cord near the connection portion.
A large number of windows are formed in the outer periphery of the cord including the identification member from the cord side of the connection part, and at least in a portion corresponding to the identification member, and a taper is formed from the connection part toward the cord side. A method for manufacturing a connection cord, which comprises a third step of covering a mold member formed in a shape and pressing it with heat.