JP5068726B2 - Unidirectional dynamic microphone - Google Patents

Description

  The present invention relates to a unidirectional dynamic microphone that is formed by housing an inner cylinder having an air chamber that forms part of an acoustic circuit of a microphone unit inside a grip housing.

In a hand-held unidirectional dynamic microphone, for example, as disclosed in Patent Document 1 below, an inner cylinder is elastically supported through an elastic body in a grip housing in order to reduce vibration noise. Some are housed under certain conditions.
JP 2006-33214 A

  In this case, vibration noise applied to the grip casing side is hardly transmitted to the microphone unit provided on the inner cylinder side because an elastic body is interposed between the grip casing and the inner cylinder body.

  FIG. 5 is an explanatory view showing an example of the structure of a unidirectional dynamic microphone having substantially the same structure as the unidirectional dynamic microphone disclosed in Patent Document 1, and FIGS. FIG. 3 is an explanatory view showing the assembly procedure (all are shown as end views).

  According to these drawings, the unidirectional dynamic microphone 101 as a whole has an inner cylindrical body 102 having a substantially cylindrical shape into which the microphone unit 109 is fitted and disposed, and a substantially cylindrical shape in which the inner cylindrical body 102 is accommodated. And a head case 122 that covers the microphone unit 109 and is attached to the grip casing 112.

  Among these, as shown in FIG. 6, the inner cylindrical body 102 has an air chamber 102 a that constitutes a part of the acoustic circuit of the microphone unit 109, and the inside of the tip opening 103 thereof is inside. The rear end portion 109a of the microphone unit 109 is fitted and disposed.

  In addition, the inner cylinder 102 has a front shock mount member 105 fixedly disposed on the outer surface near the tip thereof via a stopper 106, and an output connector 110 in the rear end opening 103 via a rear shock mount member 107. Is fixedly arranged.

  On the other hand, as shown in FIG. 7, the grip housing 112 has a connector housing portion 115 having an introduction port 113 for introducing the inner cylindrical body 102 at the front end and a lead-out port 114 at the rear end. 116 are provided respectively.

  Further, the grip housing 112 has a screw hole 118 formed at a position facing the front shock mount member 105 side provided in the accommodated inner cylinder 102, and the fixing screw 119 is prevented from being removed through the screw hole 118. By being fed into the through hole 106a provided in the stopper 106, the inner cylinder body 102 can be combined integrally.

  After the inner cylindrical body 102 and the grip housing 112 are combined in this manner, as shown in FIG. 8, a sleeve-like shape made of a rubber material is formed on the outer peripheral surface of the rear end portion 116 of the grip housing 112. Cover the tail cover 117.

  In addition, a fixing ring 123 is fitted at the tip of the grip housing 112, and a head case 122 made of, for example, mesh metal is attached to protect the microphone unit 109. The unidirectional dynamic microphone 101 is assembled.

  For this reason, the vibration noise applied to the grip casing 112 is fitted and arranged in the inner cylinder 102 by interposing the front shock mount member 105 and the rear shock mount member 107 between the inner casing 102 and the vibration noise. It is possible to make it difficult for the microphone unit 109 to be transmitted.

  However, the unidirectional dynamic microphone 101 having the structure shown in FIG. 5 does not only require the inner cylinder body 102 and the grip housing 112 to be integrated via the fixing screw 119, but also an operation for disassembling each other. However, there was an inconvenience that made it so complicated.

  Moreover, the unidirectional dynamic microphone 101 has a problem that the front shock mount member 105 and the rear shock mount member 107 must be disposed before and after the unidirectional dynamic microphone 101, and the number of parts increases accordingly.

  An object of the present invention is to provide a unidirectional dynamic microphone that is easy to assemble and disassemble and that can reduce costs by reducing the number of parts.

  The present invention has been made to achieve the above object, and has an air chamber that forms part of the acoustic circuit of the microphone unit, and the rear end of the microphone unit is fitted in the front opening. An inner cylinder having a substantially bottomed cylindrical shape, and a grip casing having a substantially cylindrical shape in which an output connector is mounted on the rear end side and accommodates the inner cylinder. The main feature is that a flock layer is formed on the outer peripheral surface of the base material by electrostatically flocking a large number of short fibers having a raised length that is in close contact with the inner peripheral surface of the grip housing when it is housed. To do.

  In this case, the inner cylinder is elastically conductive interposed between an exposed surface that does not have the flock layer on at least one of the tip opening side and the bottom side and an inner peripheral surface of the grip housing. It is preferable that the material is electrically connected to each other and accommodated in the grip housing.

  According to the first aspect of the present invention, when the inner cylinder is accommodated in the grip housing, the flock layer of the inner cylinder falls in a direction opposite to the feeding direction and is not easily removed. As a result of being able to contact with the inner peripheral surface of the grip housing, both can be combined and fixed without using a fixing screw.

  In addition, the flock layer is composed of short fibers that are electrostatically flocked and have low vibration noise, so that vibration noise applied to the grip housing can be prevented from being transmitted from the inner cylinder to the microphone unit. Further, it is possible to effectively contribute to cost reduction by exhibiting an equivalent function without particularly using a shock mount material.

  Furthermore, the inner cylinder can be easily pulled out from the grip housing while tilting the flock layer in the radial direction by pulling the inner cylinder while rotating it, so that assembly and disassembly can be easily performed.

  According to the second aspect of the invention, the inner cylinder body and the grip housing can be disposed in an electrically conductive manner via the elastic conductive material, so that a better shielding effect is obtained. be able to.

  FIG. 1 is an explanatory view showing an example of the present invention, and FIGS. 2 to 4 are explanatory views showing the assembly procedure (all are shown as end views).

  According to these drawings, the unidirectional dynamic microphone 11 as a whole has an inner cylindrical body 12 having a substantially bottomed cylindrical shape into which the microphone unit 19 is fitted and disposed, and an approximately cylindrical body 12 in which the inner cylindrical body 12 is accommodated. A grip housing 22 having a cylindrical shape and a head case 42 that covers the microphone unit 19 and is attached to the grip housing 22 are formed.

  Of these, the inner cylinder 12 formed by, for example, deep drawing an aluminum material or the like has an air chamber 12a constituting a part of the acoustic circuit of the microphone unit 19 as shown in FIG. The rear end portion 19 a of the microphone unit 19 is fitted and disposed in the front end opening 15.

  In addition, the inner cylinder 12 is tightly connected to the inner peripheral surface 23 of the grip housing 22 when the inner cylindrical body 12 is accommodated in the outer peripheral surface 13 excluding the exposed surface 17 located on the tip opening 15 side and the exposed surface 18 located on the bottom 14 side. The floc layer 16 is formed by electrostatically flocking a large number of short fibers (for example, polyester fibers having little secular change) 16a having a raised length in contact with the fiber. In addition, when using a polyester fiber as the short fiber 16a, a weather resistance can be improved more.

  On the other hand, as shown in FIG. 3, the grip housing 22 is a connector having an introduction port 24 for introducing the inner cylindrical body 12 at the front end surface and a lead-out port 25 through which a cord (not shown) is drawn out at the rear end surface. A storage portion 27 is provided at each rear end portion 26, and an output connector 32 is stored in the connector storage portion 27.

  In this case, the grip housing 22 made of, for example, die cast and having conductivity has an inner peripheral surface 23 in which the inner cylindrical body 12 is accommodated and an inner diameter that is smaller than the inner diameter of the inner peripheral surface 23. Are provided with a connector housing portion 27 in which the output connector 32 is housed, and a step portion 28 formed at a boundary portion thereof, and the exposed surface 18 located on the bottom portion 14 side of the step portion 28 and the inner cylindrical body 12. An elastic conductive material 29 made of, for example, a conductive sponge or the like is interposed between the two.

  Furthermore, the grip housing 22 includes a through hole 26 a for inserting a screwdriver formed in the rear end portion 26 at a position facing the position of the male screw 33 provided in the output connector 32 housed in the connector housing portion 27. Yes.

  In the grip housing 22 having such a structure, the inner cylinder body 12 is fed from the bottom 14 side through the introduction port 24, so that the flock layer 16 has fallen in a direction opposite to the feeding direction and is not easily removed. Under this condition, the bottom-side exposed surface 18 is disposed in contact with the elastic conductive material 29 as shown in FIG.

  Further, the output connector 32 is fed into the connector housing portion 27 of the grip housing 22 from the outlet 25 side, and the male screw 33 included in the output connector 32 is pulled toward the through hole 26a by a driver (not shown) inserted from the through hole 26a. By projecting in this manner and abutting against the inner surface of the connector housing portion 27, it is electrically connected to a grounding terminal (not shown) of the output connector 32.

  Further, between the exposed surface 17 located on the distal end opening 15 side of the inner cylinder 12 and the introduction port 24 of the grip housing 22, as shown in FIG. The conductive material 30 is disposed, and the fixing ring 43 is further fitted, and then the head case 42 made of, for example, mesh metal is attached to protect the microphone unit 19, so that the unidirectional dynamic shown in FIG. The microphone 11 is assembled.

  Next, the operation and effect of the present invention having the above configuration will be described with reference to the illustrated example. As shown in FIG. 2, the inner cylinder body 12 in which the microphone unit 19 is fitted and arranged is shown in FIG. The elastic conductive material 29 is placed on the step portion 28 and fed into the grip housing 22 from the bottom 14 side through the introduction port 24.

  As a result, the inner cylinder 12 can be brought into intimate contact with the inner peripheral surface 23 of the grip housing 22 in a state in which the flock layer 16 has fallen in the direction opposite to the feeding direction as shown in FIG. The two can be combined and fixed together without using a fixing screw. That is, even if the inner cylinder 12 is pulled linearly in the removal direction, the inner cylinder 12 can be easily pulled out from the grip housing 22 due to the frictional force in the drop-off prevention direction generated by the short fibers 16a lying down. become unable.

  In addition, the flock layer 16 is composed of short fibers 16a that are electrostatically flocked and have little vibration noise, and vibration noise applied to the grip housing 22 is transmitted to the microphone unit 19 side through the inner cylindrical body 12. Therefore, it is possible to effectively contribute to cost reduction by exhibiting an equivalent function without particularly using a shock mount material.

  Further, the inner cylinder 12 can be easily pulled out from the grip housing 22 while tilting the flock layer 16 in the radial direction by pulling the inner cylinder 12 while being twisted, so that assembly and disassembly can be easily performed. .

  Further, in the inner cylinder 12, the exposed surface 17 on the bottom 14 side that does not have the flock layer 16 is provided with a stepped portion 28 of the grip housing 22 through an elastic conductive material 29, and an exposed surface 18 of the tip opening 15 is elastically conductive. Since it can arrange | position by making it electrically contact with the inner peripheral surface 23 of the grip housing | casing 22 through the material 30, respectively, and ensuring reliable conduction | electrical_connection, the more excellent shielding effect can be acquired.

  The above is the description of the present invention based on the illustrated example, and the specific embodiment thereof is not limited to this. For example, the inner cylinder 12 and the grip housing 22 are integrally combined without the elastic conductive materials 29 and 30 being interposed, or only one of the elastic conductive materials 29 and 30 is interposed and integrated. Can also be combined. The inner cylinder 12 may also be provided with the flock layer 16 on the bottom portion 14 and placed on the stepped portion 28 of the grip housing 22 without the elastic conductive material 29 interposed.

Explanatory drawing which illustrates the state after the assembly of this invention. Explanatory drawing which shows the assembly state of the cylindrical body in this invention. Explanatory drawing which shows the arrangement | positioning relationship between the cylindrical body and grip housing | casing in this invention. Explanatory drawing which shows the arrangement | positioning relationship with the head case after accommodating a cylindrical body in a grip housing | casing in this invention. Explanatory drawing which shows the state after the assembly in a prior art example. Explanatory drawing which shows the arrangement | positioning relationship between the cylindrical body and grip housing | casing in a prior art example. Explanatory drawing which shows the arrangement | positioning relationship between the cylindrical body and grip housing | casing in a prior art example. Explanatory drawing which shows arrangement | positioning relationship with the head case after accommodating a cylindrical body in the grip housing | casing in a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Unidirectional dynamic microphone 12 Inner cylinder 12a Air chamber 13 Outer peripheral surface 14 Bottom 15 Front end opening 16 Flock layer 16a Short fiber 17, 18 Exposed surface 19 Microphone unit 19a Rear end 22 Grip housing 23 Inner peripheral surface 24 Inlet port 25 Outlet port 26 Rear end portion 26a Through hole 27 Connector housing portion 28 Stepped portion 29, 30 Elastic conductive material 32 Output connector 33 Male screw 42 Head case 43 Fixing ring

Claims (2)

An inner cylindrical body having a substantially bottomed cylindrical shape in which an air chamber constituting a part of an acoustic circuit of the microphone unit is included and a rear end portion of the microphone unit is fitted and disposed in a front end opening;
An output connector is mounted on the rear end side, and includes at least a grip casing that has a substantially cylindrical shape that houses the inner cylinder,
A floc layer formed by electrostatically flocking a plurality of short fibers having a raised length in close contact with the inner peripheral surface of the grip housing at the time of accommodation is provided on the outer peripheral surface of the inner cylindrical body. A unidirectional dynamic microphone. The inner cylinder is formed by an elastic conductive material interposed between an exposed surface that does not have the flock layer on at least one of the tip opening side and the bottom side and an inner peripheral surface of the grip housing. The unidirectional dynamic microphone according to claim 1, wherein the unidirectional dynamic microphone is housed in the grip housing while being electrically connected to each other.

Images