JP3071579U - code - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a cord which has high mechanical strength, is lightweight, and is hardly tangled. SOLUTION: A plurality of sets of insulated conductors 1-1 to 1-3 distinguished by different colors are covered with an insulating inner covering member 2. The periphery of the inner jacket member 2 is covered with a jacket member 3 made of a braid at a predetermined interval. The braid of the jacket member 3 is
It is formed of a plurality of synthetic fibers having elasticity and high tensile strength. Welded portions 3b, 3b are formed at both ends of the jacket member 3 by thermal welding. With the jacket member 3 made of this braid, the mechanical strength such as the bending strength and the tensile strength of the cord is improved.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a cord for connecting a headphone, an earphone, a microphone, an earphone / microphone, and a speaker, an audio device, a video device, and the like.

[0002]

[Prior art]

 Conventionally, as a cord for connecting headphones or the like to audio equipment or the like, for example, a cord in which three sets (three poles) of insulated conductors are covered with an external insulator such as vinyl is known. Each insulated conductor in the outer insulator is composed of a plurality of copper wires or the like which are insulated and coated with a urethane coating or the like. In such a cord, for example, a headphone or the like is connected to one end, and a plug is connected to the other end. Then, when a plug is inserted into a receptacle provided in the audio equipment or the like, the headphones and the audio equipment and the like are electrically connected by a cord.

[0003]

[Problems to be solved by the invention]

 However, the conventional code has the following problems. For example, a cord connected to headphones or the like is hung around a neck or the like, so that there is a problem that the insulated conductor is easily broken by bending or pulling. In order to solve such a problem, the thickness of the outer insulator such as vinyl covering the insulated conductor is increased to increase the bending strength and the tensile strength. However, when the thickness of the external insulator is increased, the entire weight of the cord is increased and heavier, and the burden on the body is increased when the cord is put on the neck. On the other hand, if the thickness of the outer insulator is reduced by making the thickness of the outer insulator thinner to reduce the weight, the bending strength and tensile strength are reduced and the wire is easily broken, and when the cord is bundled when headphones etc. are not used, Since this cord is easily entangled, there are problems such as poor usability, and it has not yet been possible to provide a cord for headphones and the like that is technically sufficiently satisfactory. It is an object of the present invention to solve the problems of the prior art and to provide a cord having a large mechanical strength, a light weight and a low entanglement.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, a first invention of the present invention is a cord connected to headphones or the like, which is constituted by a plurality of insulating-coated metal wires, each of which is distinguished by a different color. A set of insulated conductors, an insulating inner covering member covering the plurality of sets of insulated conductors, and surrounding the inner covering member at a predetermined interval in a direction substantially perpendicular to the axial direction of the inner covering member. In addition, an outer cover member made of a braid made of a plurality of synthetic fibers having elasticity and high tensile strength, and both ends of the inner cover member and the outer cover member are separated by a predetermined length. A welded portion in which both end portions of the formed outer cover member are thermally welded to the inner cover member, and both end portions of the plurality of sets of insulated conductors exposed by a predetermined length from the welded portion are bound and fixed with a molten metal, respectively. And a conductor terminal portion.

According to a second aspect of the present invention, in the cord of the first aspect, the inner cover member is formed of a soft synthetic resin. According to a third aspect of the present invention, in the cord of the first aspect, the inner cover member is formed of a braid made of fibers. According to a fourth invention, in a cord connected to headphones or the like, a plurality of sets of insulated conductors each composed of a plurality of insulated metal wires and distinguished by different colors; A plurality of reinforcing members disposed along the plurality of sets of the insulating conductors and the plurality of insulating conductors and the plurality of insulating conductors at predetermined intervals in a direction substantially perpendicular to the axial direction of the plurality of reinforcing members. A jacket member made of a braid knitted with a plurality of synthetic fibers having elasticity and high tensile strength so as to surround the reinforcing member, and both end portions of the jacket member are separated by a predetermined length. At the same time, both end portions of the plurality of reinforcing members are cut by a predetermined length, and both end portions of the peeled cover member are connected to both end portions of the cut plurality of reinforcing members and the plurality of sets. A welded portion thermally welded to the insulated conductor; Both end portions of the predetermined plurality of sets of insulated conductors which are exposed by a length has a conductor terminal portion which is bundled fixed respectively the molten metal, from parts.

[0006] By adopting such a configuration, the welded portions at both ends of the jacket member made of a braid are welded to the inner jacket member, or the insulated conductor and the reinforcing member. The applied bending force and tensile force are reinforced by the jacket member, and the mechanical strength of the cord is improved. For example, when such a cord is connected to a headphone, a plug, or the like, it is easy to mechanically fix the vicinity of the welded portion inside the headphone or the like and connect the conductor terminal to the electrode terminal of the headphone or the like. Connection can be made.

[0007]

[Embodiment of the invention]

 (First Embodiment) FIGS. 1A and 1B are configuration diagrams of a cord showing a first embodiment of the present invention. FIG. 1A is a perspective view, and FIG. It is an AA line enlarged end view of the same figure (a). This cord is provided with a plurality (for example, three) of three-pole insulated conductors 1-1, 1-2, and 1-3 at the center. Each of the insulated conductors 1-1 to 1-3 is composed of a plurality of metal wires (for example, copper wire or the like) which are insulated and coated with a urethane coating or the like. The three sets of insulated conductors 1-1 to 1-3 are colored differently to distinguish each set. The insulated conductors 1-1 to 1-3 are cut to a predetermined length according to the application, and both ends thereof are bound and fixed by a molten metal (for example, solder or the like) to form conductor end portions 1-1a to 1-1a. -3a is formed so that a plurality of metal wires constituting each of the insulated conductors 1-1 to 1-3 are not separated.

[0008] The outside of the insulated conductors 1-1 to 1-3 is covered with an insulating inner cover member 2 formed of a soft synthetic resin (for example, synthetic rubber, vinyl chloride, or the like). Further, the outside of the inner cover member 2 is covered with an insulating outer cover member 3. The outer cover member 3 is coated so as to surround the inner cover member 2 at a predetermined interval d in a direction substantially perpendicular to the axial direction of the inner cover member 2. The jacket member 3 is formed of a braid made of a plurality of synthetic fibers (for example, nylon, polyester, rayon, etc.) 3a having elasticity and high tensile strength. The inner cover member 2 and the outer cover member 3 are cut into predetermined lengths together with the inner insulated conductors 1-1 to 1-3 depending on the application, and then the inner cover member 2 and the outer cover member 3 are cut. After both ends are peeled off by a predetermined length L to expose the insulated conductors 1-1 to 1-3, both ends of the peeled outer casing member 3 are thermally welded to the inner casing member 2. The welded portion 3b is formed to prevent the braid of the jacket member 3 from being separated.

[0009] Such a three-pole cord is manufactured, for example, as follows. A plurality of insulated metal wires are twisted with a buncher to form three insulated conductors 1-1 to 1-3, and then the three insulated conductors 1-1 to 1-3 are drummed. To take up. The three insulated conductors 1-1 to 1-3 wound on the drum are fed, covered with the inner cover member 2 by an extruder, and wound on the drum. On the other hand, the synthetic fiber 3a for braiding is wound up on a bobbin. A plurality of bobbins around which the synthetic fibers 3a are wound are set on a braiding machine, and an insulated member 2 covered with an insulated conductor which is unwound from a drum is set at the center. If the outer cover member 3 is formed by braiding and wound around a drum, the production of the cord for three poles is completed.

When the cord manufactured in this way is used, it is cut into a predetermined length according to the application. Both ends of the outer cover member 3 and the inner cover member 2 of the cut cord are cut using a cutting jig such as a heating wire, and the cut outer cover member 3 and the inner cover member 2 are separated. The insulated conductors 1-1 to 1-3 are exposed by a predetermined length L. Then, both ends of the cut outer jacket member 3 are heated by a jig for heat welding, and are thermally welded to the inner jacket member 2 to form a welded portion 3b. This prevents both ends of the braid constituting the outer cover member 3 from being separated, and the outer cover member 3 is fixed to the inner cover member 2.

After or before the formation of the welded portion 3b, both ends of each of the insulated conductors 1-1 to 1-3 having a predetermined length L exposed from both ends of the outer cover member 3 and the inner cover member 2 are connected. Then, the conductor ends 1-1a to 1-3a are formed by binding and fixing each with a molten metal such as solder. When connecting the cord of a predetermined length processed in this way to headphones, a plug, or the like, the vicinity of the welded portion 3b is mechanically fixed to the headphones or the like, and the conductor terminal portions 1-1a to 1-3a are connected to the headphone. If connected to an electrode terminal of a headphone or the like, an electric signal of a headphone or the like can be transmitted by this cord.

The first embodiment has the following effects (1) to (5). (1) Since a predetermined distance d is provided between the inner cover member 2 and the outer cover member 3 formed of a braid, the outer cover member 3 is easily bent, and the outer cover member 3 is formed of a braid. The bending strength is large, and disconnection of the insulated conductors 1-1 to 1-3 due to bending can be prevented. Furthermore, since the braid forming the jacket member 3 is knitted with a plurality of synthetic fibers 3a having elasticity and high tensile strength, when a tensile stress acts from the outside, the jacket member 3 is formed. The length between the welded portions 3b at both ends is extended, the diameter of the outer cover member 3 is reduced, and the inner inner cover member 2 and the insulated conductors 1-1 to 1-3 are tightened. For this reason, the tensile strength of the cord is remarkably increased, and disconnection due to tension can be accurately prevented.

(2) When, for example, a nylon yarn is used as the synthetic fiber 3a of (1), the following mechanical strength is obtained. Nylon yarn used No. 0.2 44 denier (however, denier is a value when 1 g of yarn is 9000 m and 1 g) Cross-sectional diameter: 0.074 mm Mechanical properties of nylon material Tensile strength: 700 to 850 kg / cm ³ Elongation; 20-200% Flexural strength: 560-1,100 kg / cm ³

Cord size Conventional and cord sizes of the present embodiment; 2.2 mm in diameter, 3-core cord Flexural strength Conventional cord; 50 g load, broken at about 20,000 turns. The cord of the present embodiment; disconnection at a load of 50 to 60,000 to 200,000 times. Tensile strength Conventional cord; 5 kg, broken in 1-5 minutes. The cord of the present embodiment; As described above, in the cord of the present embodiment, a remarkable effect that the mechanical strength such as the bending strength and the tensile strength is about 3 to 10 times that of the conventional cord was obtained.

(3) Since the outer cover member 3 is formed of a braid, it is not necessary to increase the thickness of the inner cover member 2 in order to increase the mechanical strength as in the related art. That is, even if the thickness of the inner cover member 2 is reduced, the mechanical strength can be improved by the outer cover member 3 made of a braid, so that the weight of the entire cord can be reduced. For this reason, the weight of the cord can be reduced to reduce the burden on the body when the cord is put on the neck or the like. (4) By twisting the synthetic fibers 3a having elasticity to form a braid, elasticity is generated in the cord, and characteristics that are hardly entangled can be obtained, thereby improving the usability. (5) By changing the color, the weaving method, and the like of the braids constituting the jacket member 3, it is possible to provide a design with a high degree of freedom, thereby improving the decorative value.

(Second Embodiment) FIG. 2 is a perspective view of a cord showing a second embodiment of the present invention, and elements common to the elements in FIG. 1 showing the first embodiment are: Common symbols are assigned. In the cord of the second embodiment, the inner cover member 12 covering the insulated conductors 1-1 to 1-3 is formed of a braid formed by insulating fibers (for example, polyester, rayon, etc.). This is different from the first embodiment. Other configurations are the same as those of the first embodiment.

When this cord is manufactured, for example, the insulated conductors 1-1 to 1-3 wound on a drum are set at the center of a braiding machine, and a fiber is wound around the insulated conductors 1-1 to 1-3. The inner braid member 12 is formed. Thereafter, similarly to the first embodiment, the outer cover member 3 is formed by braiding around the inner cover member 12 with a braiding machine. Other manufacturing steps are performed in substantially the same manner as in the first embodiment. The second embodiment has substantially the same effects as the effects (1) to (5) of the first embodiment. In particular, in the cord of the second embodiment, since the inner cover member 12 is formed of a braid, it is easier to bend, more flexible, and lighter in weight than the first embodiment. There is.

(Third Embodiment) FIG. 3 is an enlarged end view showing a third embodiment of the present invention corresponding to FIG. 1 (b), and shows the first embodiment in FIG. Elements that are common to the elements are given the same reference numerals. In the cord of the third embodiment, the inner cover member 2 of FIG. 1 is omitted, and a plurality of reinforcing members 22 such as nylon having a large tensile strength are provided along three sets of insulated conductors 1-1 to 1-3. The first embodiment differs from the first embodiment in that the braided outer member 3 is provided at a predetermined distance d from the insulated conductors 1-1 to 1-3 and the reinforcing member 22. ing. Other configurations are almost the same as those of the first embodiment. The welded portions 3b formed at both ends of the jacket member 3 are welded to the insulated conductors 1-1 to 1-3 and the reinforcing member 22.

In this cord manufacturing method, for example, the insulated conductors 1-1 to 1-3 and the reinforcing member 22 are set at the center of a braiding machine, and the insulated conductors 1-1 to 1-3 and the reinforcing member 2 are set. The outer member 2 is braided to form the jacket member 3. Other manufacturing steps are almost the same as those of the first embodiment. The third embodiment has substantially the same effects as the effects (1) to (5) of the first embodiment. In particular, in the second embodiment, the inner cover member 2 shown in FIG. 1 is omitted, and a reinforcing member 22 is provided in place of the inner cover member 2, and the deterioration of mechanical strength such as bending strength and tensile strength is complemented by the reinforcing member 22. Therefore, there is an effect that the cord can be made thinner and lighter without significantly reducing the mechanical strength.

The present invention is not limited to the above embodiment, and various modifications are possible. For example, there are the following modifications (a) to (c). (A) The number of insulated conductors 1-1 to 1-3 is not limited to three, but may be one, two, or four or more. (B) The materials of the insulated conductors 1-1 to 1-3, the inner cover members 2, 12, the outer cover member 3, and the like are not limited to the materials exemplified in the embodiment, but may be any materials having similar properties. However, any material may be used. (C) In the cords of FIGS. 1 and 2, one inner cover member 2, 12 is covered with a braided outer cover member 3, but two or more inner cover members 2, depending on the application. , 12 may be collectively covered with a jacket member 3 made of a braid.

[0021]

[Effect of the invention]

 As described in detail above, according to the first invention, the periphery of the inner cover member that covers the insulated conductor is covered with the outer cover member formed of a braid at a predetermined interval, and the braid of the outer cover member is formed. Is made of a plurality of synthetic resins with high elasticity and high tensile strength, so that it is possible to increase the mechanical strength such as flexural strength and tensile strength while reducing the weight of the cord, and to prevent the breakage of the insulated conductor. It can be prevented exactly. In addition, since the weight can be reduced by the braid, the burden on the body such as the neck when used for headphones or the like can be reduced. Further, since the braid of the jacket member is formed of a plurality of synthetic resins having elasticity and high tensile strength, elasticity is generated in the cord, and characteristics that are hardly entangled can be obtained. In addition, by changing the color of the braid, the way of weaving, etc., a design with a high degree of freedom can be made, thereby improving the decorative value.

According to the second invention, since the inner cover member is formed of a soft synthetic resin, the inner cover member can be easily formed by using an extruder or the like, and the cost can be reduced by simplifying the manufacturing. Becomes According to the third invention, since the inner cover member is formed of a braid, it is easy to bend and has higher flexibility and lighter weight than the second invention.

According to the fourth invention, a jacket made of a braid made of a plurality of synthetic resins having elasticity and high tensile strength is provided at predetermined intervals around the insulated conductor and the reinforcing member. Since it is covered with the member, the deterioration of the mechanical strength such as the bending strength and the tensile strength accompanying the omission of the inner cover member of the first invention can be complemented by the reinforcing member. For this reason, it is possible to make the cord thinner and lighter than the cord of the first invention without significantly reducing the mechanical strength.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a code showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a cord according to a second embodiment of the present invention.

FIG. 3 is an enlarged end view showing a third embodiment of the present invention corresponding to FIG. 1 (b).

[Explanation of symbols]

 1-1 to 1-3 Insulated conductors 1-1a to 1-3a Conductor end portions 2, 12 Inner covering member 3 Outer covering member 3a Synthetic fiber 3b Welding portion 22 Reinforcing member

Claims (4)

[Utility model registration claims] A plurality of sets of insulated conductors, each of which is constituted by a plurality of insulated metal wires and distinguished by different colors; an insulative inner covering member for covering the plurality of sets of insulated conductors; An outer covering member made of a braid made of a plurality of synthetic fibers having elasticity and high tensile strength so as to surround the inner covering member at a predetermined interval in a direction substantially perpendicular to the axial direction of the inner covering member. A welded portion in which both end portions of the inner cover member and the outer cover member are separated by a predetermined length, and both end portions of the separated outer cover member are thermally welded to the inner cover member; and And a conductor end portion in which both ends of the plurality of sets of insulated conductors exposed by a predetermined length are respectively bound and fixed with molten metal. 2. The cord according to claim 1, wherein the inner cover member is formed of a soft synthetic resin. 3. The cord according to claim 1, wherein the inner cover member is formed of a braid made of fibers. 4. A plurality of sets of insulated conductors each composed of a plurality of insulated metal wires and distinguished by different colors; and a plurality of reinforcing members arranged along the plurality of sets of insulated conductors. The plurality of sets of insulated conductors and the plurality of reinforcing members have elasticity so as to surround the plurality of sets of insulated conductors and the plurality of reinforcing members at predetermined intervals in a direction substantially perpendicular to the axial direction of the reinforcing members. And a covering member made of a braid knitted with a plurality of synthetic fibers having a large tensile strength, and both ends of the covering member are peeled off by a predetermined length, and both ends of the plurality of reinforcing members are separated. A welded portion cut by a predetermined length and both ends of the peeled jacket member are heat-welded to both ends of the cut plurality of reinforcing members and the plurality of sets of insulated conductors, A plurality of sets of the plurality of sets exposed only a predetermined length from the welded portion. Code, characterized in that it comprises a conductor terminal portion having both ends are bundled fixed at each molten metal conductor, a.