JP5457314B2 - Method for manufacturing flexible shaft and microphone - Google Patents

Description

  The present invention relates to a method of manufacturing a flexible shaft that can immediately and stably fix the position of a microphone unit that collects sound, for example, in a headset microphone, and a microphone including the flexible shaft.

In the headset type microphone 10 shown in FIG. 3, a microphone unit 11 that collects sound is supported by one end (tip) of a flexible shaft 12. The other end of the flexible shaft 12 is supported on the headband 13 side, and when the user wears the headband 13, the microphone unit 11 is positioned substantially at the mouth of the user.
In addition, headphone units 20 are provided at both ends (or only one side) of the headband 13 so as to output, for example, the voice of the other party through a telephone line.

As described above, when the headband 13 is attached, the microphone unit 11 is disposed near the user's mouth, but the flexible shaft 12 has flexibility in order to achieve a more preferable arrangement. Some deformation (bending, twisting, etc.) is possible.
In other words, the arrangement of the microphone unit 11 can be finely adjusted by bending the flexible shaft 12 for each user.

Incidentally, the conventional flexible shaft 12 includes a so-called flexible pipe structure in which a round wire made of a hard metal such as copper is formed into a coil spring shape and a triangular wire is wound around the gap as disclosed in Patent Document 1.
However, since the structure is complicated, there exists a subject that manufacturing cost becomes bulky.

On the other hand, as shown in FIGS. 4 and 5 (cross section), a microphone cord 15 and a copper wire 16 are arranged in a sheath 14 made of, for example, PVC (polyvinyl chloride) as an easier and cheaper configuration. There is. As shown in FIG. 5, the microphone cord 15 and the copper wire 16 are covered in a state of being in close contact with the sheath 14.
The microphone cord 15 is a two-core shielded wire composed of a signal wire 17 and a power wire 18 each covered with PVC or the like, and a shield covered wire 19 covering the periphery thereof.
Moreover, the copper wire 16 provided as a plastically deformable wire is formed to have substantially the same diameter as the microphone cord 15, for example.
According to the flexible shaft 12 having such a configuration, since the copper wire 16 is disposed in the sheath 14 of flexible synthetic resin made of PVC or the like, it can be easily deformed (bent). Moreover, since the material cost is lower than that of the flexible pipe structure and the manufacturing process is not complicated, the manufacturing cost can be reduced.

JP 2008-67123 A

However, in the structure shown in FIGS. 4 and 5, the copper wire 16 is deformed by an external force such as “bending” or “twisting” applied to the flexible shaft 12, while the sheath 12 is originally deformed. Since the force to return is working, the sheath 12 sometimes slips and rotates with respect to the copper wire 16.
That is, when the sheath 12 slips and rotates as described above, the flexible shaft 12 does not bend as the user desires, or it takes time to stabilize the position of the microphone unit supported at the tip. there were.

  The present invention has been made paying attention to the above points, and supports a microphone unit that collects sound at the tip, and a flexible shaft in which a plastically deformable wire is disposed in a sheath made of a flexible synthetic resin. The purpose of the present invention is to provide a method for manufacturing a flexible shaft that can maintain the shape deformed by an external force and can immediately and stably fix the position of the microphone unit, and a microphone including the flexible shaft. .

In order to solve the above-described problems, a flexible shaft manufacturing method according to the present invention supports a microphone unit that collects sound and is flexible in which a microphone cord of a two-core shielded wire connected to the microphone unit is wired. A method of manufacturing a shaft, comprising: forming a film of a thermoplastic adhesive on an outer peripheral surface of a plastically deformable wire; and heating and dissolving the wire coated with the thermoplastic adhesive together with the microphone cord A step of covering with the flexible synthetic resin, cooling the flexible synthetic resin to form a sheath for covering the microphone cord and the wire, and an outer peripheral surface of the wire and the sheath for covering the sheath And a step of forming an adhesive layer with the thermoplastic adhesive.
In the step of forming a film of thermoplastic adhesive on the outer peripheral surface of the plastically deformable wire, the thermoplastic adhesive dissolved in an organic solvent is applied to the outer peripheral surface of the wire, and the organic solvent It is desirable to form a film of the thermoplastic adhesive by volatilizing.

According to such a method, an adhesive layer can be formed between the outer peripheral surface of the wire disposed in the flexible shaft and the sheath, and the wire and the sheath can be firmly bonded.
Therefore, when the flexible shaft is deformed by an external force (for example, by the user's hand), the sheath does not slip with respect to the wire, and the deformed shape can be maintained. That is, the position of the microphone unit provided at the tip of the flexible shaft can be immediately and stably fixed.

  In order to solve the above-described problems, a microphone according to the present invention supports a microphone unit that collects sound on the tip of a sheath made of a flexible synthetic resin, and a two-core shield connected to the microphone unit. A microphone comprising a flexible shaft in which a microphone cord composed of a wire and a plastically deformable wire is covered with the sheath, the outer surface of the plastically deformable wire being covered with the flexible shaft. An adhesive layer is provided between the sheath and the wire rod and the sheath are bonded to each other by the adhesive layer.

According to such a configuration, the adhesive layer is provided between the outer peripheral surface of the wire disposed in the flexible shaft and the sheath, and the wire and the sheath are firmly bonded.
With this configuration, when the flexible shaft is deformed by an external force (for example, by a user's hand), the sheath does not slip with respect to the wire, and the deformed shape can be maintained. That is, the position of the microphone unit provided at the tip of the flexible shaft can be immediately and stably fixed.

  According to the present invention, a shape that is deformed by an external force is maintained in a flexible shaft that supports a microphone unit that collects sound at the tip and arranges a plastically deformable wire in a sheath made of a flexible synthetic resin. In addition, a method for manufacturing a flexible shaft capable of immediately and stably fixing the position of the microphone unit and a microphone including the flexible shaft can be obtained.

FIG. 1 is a cross-sectional view of a flexible shaft manufactured by the method for manufacturing a flexible shaft according to the present invention. FIG. 2 is a flow showing the flow of the flexible shaft manufacturing method according to the present invention. FIG. 3 is a front view showing the overall configuration of the headset microphone. FIG. 4 is a side view showing a configuration of a conventional flexible shaft. FIG. 5 is a cross-sectional view showing a configuration of a conventional flexible shaft.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a flexible shaft manufactured by the method for manufacturing a flexible shaft according to the present invention.
In FIG. 1, members that are the same as or correspond to those shown in the conventional example described with reference to FIGS. 3 to 5 are denoted by the same reference numerals.

The flexible shaft 1 shown in FIG. 1 is used in place of, for example, the flexible shaft 12 included in the headset microphone 10 shown in FIG. Alternatively, a gooseneck microphone (not shown) that fixes the lower end on the desk may be used as a member that supports the microphone unit.
The flexible shaft 1 includes a sheath 14 having a predetermined length and a predetermined diameter made of, for example, PVC (polyvinyl chloride) as a flexible synthetic resin, and a microphone cord 15 is wired therein (the microphone cord 15 is a sheath). 14).
As shown in the figure, the microphone cord 15 is a two-core shielded wire comprising a signal wire 17 and a power wire 18 each covered with PVC or the like, and a shield covered wire 19 covering the periphery thereof.

As shown in the figure, a copper wire 16 as a plastically deformable wire is covered with a sheath 14 together with a microphone cord 15. The copper wire 16 is formed to have a thickness approximately the same as that of the microphone cord 15, and can be plastically deformed together with the microphone cord 15 even when covered with the sheath 14.
Further, the adhesive layer 2 is formed on the outer peripheral surface of the copper wire 16 so that the outer peripheral surface of the copper wire 16 and the sheath 14 are firmly bonded. The adhesive layer 2 is formed by cooling and solidifying, for example, a thermoplastic polyester hot melt adhesive (for example, Aronmelt PES-360S30 manufactured by Toa Gosei Co., Ltd.) as a thermoplastic adhesive.

  Thus, when the flexible shaft 1 is deformed by an external force (for example, by a user's hand) by providing the copper wire 16 in the sheath 14 via the adhesive layer 2, the sheath 14 is against the copper wire 16. Does not slip, and the deformed shape is maintained. That is, the position of the microphone unit 11 provided at the tip of the flexible shaft 1 can be immediately and stably fixed.

The flexible shaft 1 is configured through the steps shown in FIG.
First, a thermoplastic polyester hot melt adhesive (for example, Aronmelt PES-360S30 manufactured by Toa Gosei Co., Ltd.) dissolved in an organic solvent is applied to the outer peripheral surface of the copper wire 16 (step S1 in FIG. 2). The organic solvent in the adhesive is volatilized by leaving it for a predetermined time in a room temperature environment (step S2 in FIG. 2). Thus, a thermoplastic adhesive film having a predetermined thickness is formed on the outer peripheral surface of the copper wire 16.

Next, the copper wire 16 coated with the adhesive is supplied to an extruder used for so-called plastic extrusion together with the microphone cord 15 formed of a two-core shielded wire.
With this extruder, a material obtained by heating and melting PVC, for example, as a flexible synthetic resin is coated on the microphone cord 15 and the copper wire 16 (step S3 in FIG. 2).
At this time, since the adhesive coated on the copper wire 16 is thermoplastic, it is dissolved by the heat of the PVC melted by heating.

  And the sheath 14 which covers the microphone cord 15 and the copper wire 16 is formed by cooling for a predetermined time. Moreover, the adhesive agent coat | covered with the copper wire 16 solidifies by cooling, forms the contact bonding layer 2, and adhere | attaches the outer peripheral surface of the copper wire 16 and the sheath 14 (step S4 of FIG. 2).

As described above, according to the embodiment of the present invention, the adhesive layer 2 is provided between the outer peripheral surface of the copper wire 16 disposed in the flexible shaft 1 and the sheath 14, and the copper wire 16, the sheath 14, Is firmly bonded.
With this configuration, when the flexible shaft 1 is deformed by an external force (for example, by a user's hand), the sheath 14 does not slip with respect to the copper wire 16, and the deformed shape can be maintained. That is, the position of the microphone unit 11 provided at the tip of the flexible shaft 1 can be immediately and stably fixed.

  In the above embodiment, the copper wire 16 has been described as an example of a plastically deformable wire. However, the present invention is not limited to this, and other plastically deformable steel materials may be used as the wire. It may be used.

DESCRIPTION OF SYMBOLS 1 Flexible shaft 2 Adhesive layer 14 Sheath 15 Microphone cord 16 Copper wire (wire)
17 Signal line 18 Power line 19 Shielded wire

Claims (3)

A method of manufacturing a flexible shaft that supports a microphone unit that collects sound and that is wired with a microphone cord of a two-core shielded wire connected to the microphone unit,
Forming a film of thermoplastic adhesive on the outer peripheral surface of the plastically deformable wire;
Coating the wire coated with the thermoplastic adhesive with a flexible synthetic resin that is heated and dissolved together with the microphone cord;
The flexible synthetic resin is cooled to form a sheath that covers the microphone cord and the wire, and is bonded between the outer peripheral surface of the wire and the sheath covering the wire by the thermoplastic adhesive. Forming a layer. A method for manufacturing a flexible shaft. In the step of forming a film of thermoplastic adhesive on the outer peripheral surface of the plastically deformable wire,
The said thermoplastic adhesive film | membrane is formed by apply | coating the said thermoplastic adhesive dissolved in the organic solvent to the outer peripheral surface of the said wire, and volatilizing the said organic solvent. Method for manufacturing a flexible shaft. A microphone unit that collects sound is supported at the tip of a sheath made of a flexible synthetic resin, and a microphone cord made of a two-core shielded wire connected to the microphone unit and a plastically deformable wire covering the sheath A microphone having a flexible shaft,
In the flexible shaft, an adhesive layer is provided between an outer peripheral surface of the plastically deformable wire and the sheath covering the wire, and the wire and the sheath are bonded by the adhesive layer. A featured microphone.

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