JP3157906U - Parallel cord - Google Patents

Abstract

A parallel cord that can be designed with a high degree of freedom in decoration, has excellent channel separation characteristics, is lightweight, has mechanical strength and flexibility, is difficult to be entangled, and is easy to bundle. A parallel cord 1 includes a linear first conductor 10-1 and a linear second conductor 10- arranged in parallel to the first conductor 10-2 at a predetermined interval. 2 and an insulating covering member 20 having a strip shape in which the radial cross section covering these first and second conductors 10-1 and 10-2 is substantially square and the longitudinal direction is flat. ing. An opening 30 is formed between the first and second conductors 10-1 and 10-2 in the jacket member 20 and at a predetermined interval in the longitudinal direction. The jacket member 20 is formed by laminating a plurality of coating members 21 and 22 of different colors, and the plurality of different colors are visible from each opening 30. [Selection] Figure 1

Description

  The present invention relates to a parallel cord for connecting a headphone, an earphone, a microphone, an earphone / microphone, and the like to a portable audio device, a mobile phone, or the like.

  For example, Patent Document 1 below describes a parallel cord technique used for stereo headphones.

  In a conventional parallel cord, two conductors each composed of a plurality of copper wires or the like are arranged in parallel at a predetermined interval, and these two conductors are polyvinyl chloride (hereinafter referred to as “PVC”) or the like. Two insulated electric wires having a circular cross section are formed by being covered with the outer covering member, respectively, and the two insulated electric wires are joined to each other by the outer covering member.

Japanese Patent Laid-Open No. 11-252681

  However, the conventional parallel cord has the following problems (a) to (c).

  (A) Since the conventional parallel cord has a structure in which two insulated wires having a circular cross section are joined to each other, a decorative design cannot be applied.

  (B) The two inner conductors are easily cut and entangled by bending.

  (C) In order to improve the channel separation characteristics between two insulated wires, it is necessary to increase the outer diameter of each insulated wire to increase the distance between the two conductors. Here, channel separation is the ratio of the signal leaked from other channels to the self channel level when signals are transmitted on multiple channels. In stereo, the signal leaks from one channel and the other channel. The ratio of magnitude to the received signal is expressed in decibels (dB). However, increasing the outer diameter of the two insulated wires to improve channel separation characteristics increases the weight of the entire parallel cord, and when using headphones with a parallel cord to which the headphone body is attached, etc. This puts a burden on the body.

  (D) When the outer diameters of the two insulated wires are increased as in (c), the strength is increased and the flexibility is reduced. Therefore, when using a headphone with a parallel cord to which a headphone main body or the like is attached, it is uncomfortable with the curved part of the body and is difficult to bundle because it is difficult to bundle when not in use.

  The parallel cord of the present invention includes a linear first conductor, a linear second conductor arranged in parallel with a certain distance from the first conductor, and the first and second conductors. A predetermined interval in the longitudinal direction between the first and second conductors in the sheath member and an insulating sheath member having a belt-like shape in which the cross section in the radial direction is substantially square and the longitudinal direction is flat. And a plurality of openings that are open at the same time. Further, the jacket member is formed by laminating a plurality of different color coating members, and the plurality of different colors are visible from the openings.

The present invention has the following effects (1) to (4).
(1) Since the openings are formed at predetermined intervals along the longitudinal direction of the jacket member composed of a plurality of different-colored laminated structures, a plurality of different-colored laminated structures can be visually recognized from each opening. The decorative effect can be improved.

  (2) Since the first and second conductors are covered with the outer cover member having a laminated structure, the bending strength is large, and the first and second conductors inside are difficult to break and are not easily entangled by bending.

  (3) Since the first and second conductors are separated from each other in the cord radial direction, the channel separation characteristics between the first and second conductors can be improved while reducing the cross-sectional area of the cord diameter. Furthermore, since the cross-sectional area of the cord diameter is reduced and the opening is formed, the entire parallel cord can be reduced in weight, and the burden on the body during use can be reduced.

  (4) As described in (3) above, the entire parallel cord can be made thin, and the opening is formed. Therefore, the flexibility is increased, and the wearing feeling is improved by adapting to the curved part of the body at the time of use. And it becomes easy to bundle by using an opening part at the time of non-use.

  As described in (1) to (4), according to the present invention, a design with a high degree of freedom in decoration is possible, excellent in channel separation characteristics, lightweight, mechanical strength and flexibility. Therefore, it is possible to realize a parallel cord that is not easily entangled and easy to bundle.

FIG. 1 is a block diagram showing a parallel cord in Embodiment 1 of the present invention. FIG. 2 is a schematic manufacturing process diagram showing an example of a manufacturing method in the parallel cord 1 of FIG. FIG. 3 is a schematic plan view showing a part of the parallel cord according to the second embodiment of the present invention.

  The mode for carrying out the invention will become apparent from the following description of the preferred embodiments when read in light of the accompanying drawings. However, the drawings are for explanation only and do not limit the scope of the present invention.

(Configuration of Example 1)
1A to 1C are configuration diagrams showing a parallel cord in Embodiment 1 of the present invention, where FIG. 1A is a partial perspective view, and FIG. 1B is a conductor in the parallel cord. The enlarged sectional view in the radial direction of FIG. 1 and FIG. 1C are sectional views taken along line I1-I2 in FIG.

  The parallel cord 1 of the first embodiment is a two-channel cord for connecting a headphone, an earphone, a microphone, an earphone / microphone, and the like to a portable audio device, a cellular phone, etc., and is one of the two channels. A linear first conductor 10-1 that is a channel, and a linear second conductor 10-2 that is the other channel that is disposed in parallel with the first conductor 10-1 at a predetermined interval. These first and second conductors 10-1 and 10-2 are covered with an insulating jacket member 20. The overall shape of the parallel cord 1 has a substantially rectangular cross section in the radial direction (for example, a width of about 7 mm and a thickness of about 1 mm), and has a flat shape in the longitudinal direction. A substantially rectangular shape (for example, a length of 3 mm in the cord width direction, a length of the cord) between the first and second conductors 10-1 and 10-2 in the jacket member 20 and having a predetermined interval (for example, 5 mm) in the longitudinal direction. An opening 30 having a direction length of 9 mm) is formed.

  The first and second conductors 10-1 and 10-2 have the same structure, each having an outer diameter of, for example, about 0.8 mm, and each having a flexible reinforcing core 11. The reinforcing core wire 11 is formed of reinforcing fibers (for example, a diameter of about 0.1 mm) such as one or a plurality of aramid fibers. A plurality of sets (for example, three sets) of insulated conductors 12 (= 12-1 to 12-3) are twisted around the reinforcing core wire 11. Each set of insulated conductors 12 is colored in different colors (for example, three colors of natural color (transparent), green, and red) to distinguish each other, and a plurality of (for example, 14) insulated wires 13 are respectively connected. It is constructed by twisting together.

  Each insulated wire 13 is made of a polyurethane copper wire (for example, a conductor diameter of 0.006 mm) in which a conductor 13a is insulated and coated with a resin 13b.

  In addition, the diameter of the insulated wire 13 for forming each set of insulated conductors 12-1, 12-2, and 12-3 is different for each set of insulated conductors 12-1, 12-2, and 12-3. It may be allowed. For example, the transparent insulated conductor 12-1 that is a natural color is formed from an insulated wire having a diameter of 0.008 mm, and the insulated conductor 12-2 that is colored green is formed from an insulated wire having a diameter of 0.005 mm. Furthermore, the insulated conductor 12-3 colored in red may be formed of an insulated wire having a diameter of 0.006 mm. Thus, if the diameter of the insulated wire 12 is varied, when the terminal portion of the parallel cord 1 is processed, the separation work of each pair of the insulated conductors 12-1, 12-2, 12-3 (that is, the sorting work). Becomes easier.

  The reinforcing core wire 11 constituting the first conductor 10-1 and the three sets of insulated conductors 12-1 to 12-3, and the reinforcing core wire 11 constituting the second conductor 10-2 and the three sets of insulated conductors 12-1 ˜12-3 is embedded in the insulating jacket member 20. The insulating jacket member 20 is formed by laminating a plurality (for example, two) of covering members 21 and 22 of different colors.

  For example, the jacket member 20 includes a red first layer covering member 21 covering the first and second conductors 10-1 and 10-2 and a black second layer covering the covering member 21. The covering members 21 and 22 of these layers are formed of a soft synthetic resin (for example, PVC). From the outside of the parallel cord 1, the black color of the covering member 22 of the second layer can be visually recognized. Further, the red color of the covering member 21 of the first layer and the covering member 22 of the second layer can be seen from each opening 30. The cross-sectional structure with black is visible so that the decorativeness is improved.

(Example of manufacturing the parallel cord of Example 1)
2A to 2C are schematic manufacturing process diagrams showing an example of a manufacturing method for the parallel cord 1 shown in FIG. 1, and FIG. 2A shows the formation of the opening 30 using the parallel cord material. The side view which shows a process, the figure (b) is a perspective view which shows the expansion of the opening part formation part in the figure (a), and the figure (c) is a perspective view which shows a part of the manufactured parallel cord 1. FIG. It is.

  When manufacturing the two-channel parallel cord 1 shown in FIG. 1, although not shown, for example, a plurality of insulated wires 13 are twisted with a buncher to form each insulated conductor 12, and then three sets of insulated conductors 12-1 are formed. Wind ~ 12-3 on drum. The three sets of insulated conductors 12-1 to 12-3 wound around the drum are fed out, and the three sets of insulated conductors 12-1 to 12-3 are twisted around the reinforcing core wire 11 while being shifted by a predetermined distance. The second conductors 10-1 and 10-2 are respectively formed and wound around the first and second drums, respectively. The first and second conductors 10-1 and 10-2 wound around the first and second drums, respectively, are fed out in parallel and covered with a red first layer covering member 21 by an extruder. Wind it on a drum. Further, the first-layer covering member 21 wound around the drum is fed out and covered with a black second-layer covering member 22 by an extruder, and the strip-shaped parallel member having the outer-layer covering member 20 having a two-layer structure. A cord material is formed and wound on a drum.

  Then, as shown in FIGS. 2A and 2B, a press machine or the like in which the parallel cord material 1a wound around the drum 40 is fed and a die 41 having an upper die 41a and a lower die 41b is mounted. Thus, the jacket member 20 is punched out, the openings 30 are formed at predetermined intervals, and wound around the drum 42. Thereby, as shown in FIG.2 (c), manufacture of the parallel cord 1 for 2 channels of FIG. 1 is complete | finished.

  When using the parallel cord 1 manufactured in this way, for example, it is cut into a predetermined length according to the application. The terminal portion of the jacket member 20 in the cut parallel cord 1 is cut using a cutting jig such as a heating wire, and the cut jacket member 20 is peeled off to first and second by a predetermined length. If the terminal portions of the conductors 10-1 and 10-2 are exposed and connected to a headphone body, a plug or the like, it can be used for audio signal transfer.

(Effect of Example 1)
According to the first embodiment, there are the following effects (a) to (e).

  (A) Since the substantially rectangular openings 30 are formed at predetermined intervals along the longitudinal direction of the outer cover member 20 having a two-layer structure of two colors of red and black, two layers of two colors of red and black are formed from each opening 30. The structural cross section can be visually recognized, and the aesthetic decoration effect can be improved.

  (B) Since the first and second conductors 10-1 and 10-2 are covered with the outer layer member 20 having a two-layer structure, the bending strength is large, and the first and second conductors inside are formed by bending. 10-1 and 10-2 are difficult to cut and entangled.

  (C) Since the first and second conductors 10-1 and 10-2 are separated from each other in the cord radial direction, the first and second conductors 10-1 are reduced while reducing the cross-sectional area of the cord diameter. , 10-2 can be improved. Furthermore, since the cross-sectional area of the cord diameter is reduced and the opening 30 is formed, the entire parallel cord can be reduced in weight, and the burden on the body during use can be reduced.

  (D) As shown in the above (c), the entire parallel cord can be made thin, and the opening 30 is formed, so that the flexibility is increased and the wearing feeling is improved by adapting to the curved part of the body at the time of use. . And it becomes easy to bundle by using the opening part 30 at the time of non-use.

  (E) Since the three sets of insulated conductors 12-1 to 12-3 are twisted around the common reinforcing core wire 11, electrical impedance such as impedance in each set of insulated conductors 12-1 to 12-3 The characteristics become the same, and further, the diameter of each of the conductors 10-1 and 10-2 can be reduced and the weight can be reduced while increasing the mechanical strength against bending and pulling. Moreover, since each set of the insulated conductors 12-1 to 12-3 is distinguished by different colors, an error in polarity can be prevented when connecting to the headphone body or the like.

  As described in (a) to (e), according to the first embodiment, a design with a high degree of freedom in decoration is possible, excellent in channel separation characteristics, lightweight, mechanical strength and The parallel cord 1 that is flexible, hardly tangled, and easy to bundle can be realized.

  FIGS. 3A and 3B are schematic plan views showing a part of the parallel cord in the second embodiment of the present invention, and are common to the elements common to the elements in FIG. 1 showing the first embodiment. The code | symbol is attached | subjected.

  In the parallel cord 1A of FIG. 3A, between the first and second conductors 10-1 and 10-2 in the jacket member 20, substantially elliptical openings 30A are formed at predetermined intervals along the longitudinal direction. Has been.

  In the parallel cord 1B of FIG. 3B, substantially triangular openings 30B are formed at predetermined intervals along the longitudinal direction between the first and second conductors 10-1 and 10-2 in the jacket member 20. ing.

  Thus, by forming the substantially elliptical opening 30A and the substantially triangular opening 30B in the parallel cords 1A and 1B, a decoration effect different from that of the first embodiment can be obtained.

  The shape of the openings 30, 30A, 30B can be changed to various shapes other than a square, an ellipse, and a triangle, or by combining different shapes, the decorative design can be diversified. it can.

(Modification)
The present invention is not limited to the above-described embodiments, and various other usage forms and modifications are possible. For example, the following forms (i) to (iv) are used as the usage form and the modification examples.

  (I) The number of the insulated conductors 12-1 to 12-3 constituting the conductors 10-1 and 10-2 in FIG. 1 is not limited to 3 sets, but 2 sets, 4 sets, 5 sets, 6 sets The number of sets may be changed to other numbers, and each set may be colored in a different color (for example, natural colors such as transparent, green, red, and other colors) to distinguish each set. . In addition, the material, cross-sectional shape, and conductor diameter of the insulated wire 13 for forming each set of insulated conductors 12 (= 12-1 to 12-3) may be modified to other than those in Examples 1 and 2. .

  (Ii) Each of the conductors 10-1 and 10-2 is not limited to the configuration shown in FIGS. 1B and 1C. You may do it.

  (Iii) The outer cover member 20 has a two-layer structure including a red first layer covering member 21 and a black second layer covering member 22, but the two colors are changed to other colors. Alternatively, it may be changed to a multilayer structure such as a three-layer structure or a four-layer structure of different colors.

  (Iv) The cross-sectional shape, dimensions, constituent materials, manufacturing method, and the like of the parallel cords 1, 1A, 1B of the first and second embodiments are not limited to those of the first and second embodiments, and various changes can be made.

1, 1A, 1B Parallel cords 10-1, 10-2 First and second conductors 11 Reinforcing core wires 12, 12-1 to 12-3 Insulated conductors 13 Insulated wires 20 Cover members 21, 22 Cover members 30, 30A , 30B opening

Claims (5)

A linear first conductor;
A linear second conductor disposed parallel to the first conductor at a predetermined interval;
An insulative covering member having a strip shape in which the radial cross section covering the first and second conductors is substantially square and the longitudinal direction is flat;
A plurality of openings that are opened between the first and second conductors in the jacket member and at predetermined intervals in the longitudinal direction;
The parallel cord is characterized in that the jacket member is formed by laminating a plurality of coating members of different colors, and the plurality of different colors are visible from the openings. The first and second conductors are respectively
It has a flexible reinforcing core wire and a plurality of sets of insulated conductors twisted around the reinforcing core wire, and each of the sets of insulated conductors is formed by twisting a plurality of insulated wires. The parallel cord according to claim 1, wherein   The parallel cord according to claim 2, wherein the reinforcing core wire is formed of one or a plurality of reinforcing fibers.   The parallel cord according to claim 2 or 3, wherein the insulated wire is a synthetic enameled wire including a polyurethane copper wire.   The parallel cord according to any one of claims 1 to 4, wherein the jacket member is made of a soft synthetic resin.

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