JP4508899B2 - Microphone and microphone cable - Google Patents

Description

  The present invention relates to a microphone in which a microphone unit is supported by a support pipe including a flexible pipe, and a microphone cable applied to the microphone, and more specifically, mechanical vibration and support generated when the flexible pipe is bent. The present invention relates to a technique for damping external vibration propagating through a pipe.

  As one of the microphone stands, for example, as described in Patent Document 1, there is one using a support pipe including a flexible pipe that can be bent. A microphone using a flexible pipe is called a gooseneck type microphone, and is preferably used in a conference room or the like because the microphone unit is easily directed to the speaker's mouth.

  As is well known, a flexible pipe is formed by forming a coil spring that bears a restoring force with a round wire such as steel, and sandwiching a triangular wire made of a copper alloy that plastically deforms in a triangular shape in the gap between the coil springs from above. Since the round wire and the triangular wire have strong friction, they can be deformed in any direction, and the deformation state is self-maintained.

  However, since the round wire and the triangular wire are engaged with strong friction, mechanical vibration occurs when bending as a phenomenon, and the vibration is picked up by the microphone unit and generates noise. Sometimes. In addition, when installed on a desk, vibrations generated by hitting the desk or the like may be propagated to the microphone unit via the support pipe to generate noise.

  Other microphones using a flexible pipe include a headset microphone. In this microphone, noise may be generated in the same manner as the flexible pipe is bent.

JP-A-9-229292

  Accordingly, an object of the present invention is to effectively prevent mechanical vibration generated when a flexible pipe is bent and external vibration propagating through the support pipe in a microphone in which the microphone unit is supported by the support pipe including the flexible pipe. An object of the present invention is to provide braking means capable of braking.

In order to solve the above problems, the present invention provides a microphone unit supported on one end side of a support pipe including a flexible pipe, and a microphone cable connected to the microphone unit is inserted into the support pipe so that the support pipe In the microphone pulled out from the other end side, short hair piles are planted in at least a portion of the outer insulating sheath provided in the microphone cable that passes through the flexible pipe. outer diameter including the bristle tips of the pile of the microphone cable has a length such greater than the inner diameter of the support pipe, the pile is characterized and Turkey pressed against the inner surface of the flexible pipe.

The present invention also includes a microphone cable. That is, the microphone cable of the present invention is a microphone cable having an external insulation sheath inserted into a support pipe including a flexible pipe and connected to a microphone unit supported on one end side of the support pipe. Among these, at least a portion of the outer insulating sheath that is passed through the flexible pipe is planted with a short pile, and the pile has an outer diameter including the tip of the pile of the microphone cable. has a larger length such than, the pile is characterized and Turkey pressed against the inner surface of the flexible pipe.

  According to the present invention, by inserting the microphone cable into the support pipe, the pile implanted in the outer insulating sheath is pressed against the inner surface of the flexible pipe, thereby causing mechanical vibration generated when the flexible pipe is bent. Braked. Further, extraneous vibrations applied to the support pipe can be reduced.

  Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 3, but the present invention is not limited to this. FIG. 1 is a side view showing an example in which the microphone of the present invention is a gooseneck type microphone, FIG. 2 is an enlarged sectional view showing an example of a microphone cable used in the present invention, and FIG. FIG.

  As shown in FIG. 1, since the microphone 1 is a gooseneck type, the microphone unit 10 is supported on one end (upper end) side of the support pipe 20. In the gooseneck microphone, a condenser microphone unit is usually used as the microphone unit 10, but a dynamic microphone unit may be used in some cases.

  In this example, the support pipe 20 includes a flexible pipe 21 and a metal pipe 22 made of, for example, a brass material. As described above, the flexible pipe 21 is formed by forming a coil spring that bears a restoring force with a round wire such as steel, and sandwiching a triangular wire made of a copper alloy or the like that plastically deforms in a triangular shape in the space between the coil springs from above. It may be done.

  In this example, the flexible pipe 21 is connected to the upper end side of the metal pipe 22, but the arrangement order may be arbitrary. For example, the metal pipe 22 may be the top and the flexible pipe 21 may be connected to the lower end side thereof, or the metal pipe 22 may be two and the flexible pipe 21 may be connected between the two. Further, the entire support pipe 20 may be the flexible pipe 21.

  Further, in attaching the support pipe 20 to the table 30, in this example, a universal bearing 40 including a ball joint 41 is installed on the table 30, and the lower end side of the metal pipe 22 is inserted and fixed to the ball joint 41. However, you may attach the support pipe 20 to the table 30 using another metal fitting etc. which are not illustrated.

  A microphone cable 50 connected to the microphone unit 10 is pulled out from the lower end side of the support pipe 20. Referring to FIG. 2, a two-core shielded cable in which two inner conductors 51 and 52 are covered with, for example, a mesh-like shield wire 53 is used for the microphone cable 50.

  The inner conductors 51 and 52 are covered with inner insulating sheaths 51 a and 52 a, respectively, and are covered with a shield wire 53 together with an inner insulator (intervening system) 54. An outer insulating sheath (outer skin) 55 is provided around the shield wire 53.

  For the outer insulating sheath 55, for example, an elastic body having rubber elasticity such as vinyl chloride, polypropylene, silicon rubber or the like is used. In the present invention, a short pile 56 is implanted on the outer peripheral surface of the outer insulating sheath 55. Is done. The planting method may be electrostatic flocking.

  The pile 56 is a pile having such a length that the virtual outer diameter including the hair tips of the pile 56 of the microphone cable 50 is larger than the inner diameter of the support pipe 20. That is, a pile having such a length that the pile 56 is pressed against the inner surface of the support pipe 20 when the microphone cable 50 is inserted into the support pipe 20 is used.

  The pile 56 preferably has a certain degree of toughness (so-called waist) that does not hinder the insertion into the pipe. As an example, a nylon pile having a thickness of 3.3 decix and a length of 0.5 mm is used. Can be mentioned. The planting density may be arbitrarily determined in consideration of the relationship between the thickness and length of the pile 56.

  The pile 56 is preferably planted over the entire length of the portion inserted into the support pipe 20 of the microphone cable 50, but it is important for the present invention to be planted at least in the portion inserted into the flexible pipe 21. It is.

  According to this, when the microphone cable 50 is inserted into the flexible pipe 21, the pile 56 elastically contacts the inner surface of the flexible pipe 21, so that mechanical vibration generated when the flexible pipe 21 is bent is braked by the pile 56. Thus, it is difficult to be transmitted to the microphone unit 10. Further, vibrations generated by hitting the table 30 are also attenuated.

  Next, referring to FIG. 3, in the case of the gooseneck type microphone, a cylindrical metal holder 60 is attached to the tip of the support pipe 20, in this example, the tip of the flexible pipe 21, and the condenser microphone unit is attached to the holder 60. 10 is mounted.

  In the holder 60, a circuit board 70 on which an FET (field effect transistor) 71 as an impedance converter is mounted is accommodated. One end of the microphone cable 50 is drawn into the holder 60, and the internal conductors 51 and 52 are soldered to terminal portions (not shown) of the circuit board 70.

  The holder 60 and the condenser microphone unit 10 are connected by screwing. That is, a female screw 61 is formed in the opening of the holder 60, and a sleeve 11 having a male screw 12 that is screwed into the female screw 61 is provided in the condenser microphone unit 10. The condenser microphone unit 10 is attached to the holder 60 by being screwed into 61.

  At this time, the signal output shaft 13 extending from a fixed pole (not shown) of the condenser microphone unit 10 contacts a leaf spring 72 provided on the circuit board 70, and the output signal of the condenser microphone unit 10 is input to the gate pole of the FET 71. Is done.

  In such a configuration, since there is a slight gap between the circuit board 70 and the holder 60, a part of the sound wave that enters the rear acoustic terminal (not shown) of the condenser microphone unit 10 passes through the gap. It wraps around the back side of 70 (the lower side of the circuit board 70 in FIG. 3).

  In that case, when the space on the back side of the circuit board 70 is in direct communication with the space in the support pipe 20, the sound waves that have entered the back side of the circuit board 70 are cavity resonant in the space in the support pipe 20. However, according to the present invention, since the microphone cable 50 includes the pile 56, the space on the back side of the circuit board 70 is blocked from the space in the support pipe 20 by the pile 56. Therefore, the cavity resonance can be prevented. This is also one of the features of the present invention.

  The present invention has been described above by taking the gooseneck type microphone shown in FIG. 1 as an example. However, the present invention can be applied to a microphone supported by a flexible pipe, for example, for a headset.

The side view which shows an example which made the microphone of this invention the gooseneck type microphone. Sectional drawing which expands and shows an example of the microphone cable used by this invention. Sectional drawing which shows the structure of the support part of a microphone unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Microphone 10 Microphone unit 20 Support pipe 21 Flexible pipe 22 Metal pipe 30 Table 40 Universal bearing 50 Microphone cable 51,52 Inner conductor 53 Shield wire 55 Outer insulation sheath 56 Pile

Claims (2)

In the microphone in which the microphone unit is supported on one end side of the support pipe including the flexible pipe, and the microphone cable connected to the microphone unit is inserted into the support pipe and pulled out from the other end side of the support pipe.
A short-haired pile is implanted in at least a portion of the outer insulating sheath included in the microphone cable that passes through the flexible pipe, and the pile has a hair tip of the pile of the microphone cable. microphones outer diameter has a length such greater than the inner diameter of the support pipe, the pile is characterized and Turkey pressed against the inner surface of the flexible pipe comprising a. In a microphone cable having an external insulation sheath inserted into a support pipe including a flexible pipe and connected to a microphone unit supported on one end side of the support pipe,
Of the outer insulating sheath, at least a portion of the outer insulating sheath that is passed through the flexible pipe is planted with a short hair pile, and the pile has an outer diameter including the tip of the pile of the microphone cable. has a larger length such than an inner diameter of the support pipe, microphone cables the pile is characterized and Turkey pressed against the inner surface of the flexible pipe.

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