JP2008187312A - Window screen and narrow-directivity microphone with the window screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a window screen which is excellently attached to and detached from a sound pickup portion (particularly, a sound tube of a narrow-directivity microphone) of a microphone and has favorable form preservability. <P>SOLUTION: The window screen 20A which is formed of an open-cell elastic body such as an urethane foam material having a bored insertion hole 21 into which the sound tube (sound pickup portion) 10 of the microphone is inserted and detachably attached to the sound tube 10 of the microphone is provided with a slide guide member 30 which has a lower coefficient of friction than that of the elastic body forming the window screen and is for the insertion of the sound pickup portion 10, on the inner peripheral surface of the insertion hole 21 along the axis of the insertion hole 21. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a window screen that can be detachably attached to a sound collection unit of a microphone so that the microphone does not pick up wind noise, and more particularly to a window screen that has good detachability and shape retention.

  For example, when a microphone is used outdoors, a window screen (windshield) is attached to the sound collection part (microphone unit part) of the microphone so as not to pick up wind noise.

  Most of this type of window screen is formed in a cylindrical shape by foamed resin (open cell) such as foamed urethane material, and the sound collecting part of the microphone is inserted by inserting the sound collecting part of the microphone into the cylinder. (See, for example, Patent Document 1).

  By the way, among various microphones, as shown in FIG. 2, for example, a narrow directional microphone M used for a business video camera or the like includes a long acoustic tube 10, and therefore a window for a narrow directional microphone. The screen 20 is also formed to be long in accordance with it.

  In the first place, since the window screen is made of foamed resin such as urethane foam as described above, it is difficult to slide. There is a problem that it takes time to plug.

  In particular, when a large number of slits 11 as shown in FIG. 2 are formed on the side surface of the acoustic tube 10, the frictional resistance is increased accordingly, so that the installation of the window screen 20 becomes more difficult. .

  Another problem is that since the material is urethane material, it tends to deteriorate over time due to hydrolysis, etc., and in extreme cases, it becomes tattered. Is preferred.

  However, if an external force is applied during the storage, it will be deformed and will not easily return to its original shape during use. In the worst case, if the insertion hole 21 is stored for a long time in a crushed state, it may not be attached to the acoustic tube 10.

JP 2000-217177 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a window screen that is excellent in detachability with respect to a sound collection section of a microphone (particularly, an acoustic tube of a narrow directivity microphone) and has good shape retention.

  In order to solve the above-described problems, the present invention comprises an open-cell elastic body having an insertion hole into which a sound collection portion of a microphone is inserted, as described in claim 1, and In the window screen that is detachably attached to the sound part, a sliding guide member that has a lower coefficient of friction than the elastic body and passes through the sound collection part is provided on the inner peripheral surface of the insertion hole. It is characterized by being provided along the direction.

  In this invention, it is preferable that the said slide guide member is formed in the cylindrical body which rounded the porous mesh sheet | seat as described in Claim 2.

  Further, as described in claim 3, the total length of the sliding guide member is shorter than the axial length of the insertion hole, and the inlet end of the insertion hole on the side where the sound collection part is inserted is It is preferable that a retaining means having a higher friction coefficient than that of the sliding guide member in which the elastic body directly contacts the sound collecting portion is provided.

  According to the present invention, there is also provided a narrow directional microphone in which the window screen according to any one of claims 1 to 3 is placed over a sound collecting portion of the microphone. included.

  According to the present invention, the sliding guide member having a lower coefficient of friction than the open cell elastic body forming the window screen is provided on the inner peripheral surface of the insertion hole of the window screen. Even a long window screen for a microphone can be easily attached to and detached from the sound collection unit of the microphone.

  In addition, by using a cylindrical body obtained by rounding a porous mesh sheet for the sliding guide member, it is possible to prevent deformation during storage after being removed from the microphone.

  Moreover, a high friction coefficient retaining means for allowing the elastic body of the open cell forming the window screen to directly contact the sound collecting portion of the microphone is provided at the inlet end of the insertion hole on the side where the sound collecting portion is inserted. By providing, it is possible to prevent the window screen from being accidentally dropped from the sound collection unit.

  Next, an embodiment of the present invention will be described with reference to FIG. The window screen according to this embodiment is used for a narrow directional microphone, and FIG. 1 shows the window screen together with the narrow directional microphone as a cross section. Note that the same reference numerals are used for components that may be considered the same as or the same as those of the conventional example described with reference to FIG.

  The window screen 20A is made of a foam resin molded product having open cells such as a foamed urethane material, and is attached along the long acoustic tube (sound collecting unit) 10 of the narrow directivity microphone M, also called a gun microphone. It is formed in a cylindrical shape.

  The window screen 20A is attached to the acoustic tube 10 so as to cover at least the front acoustic terminal 10a of the acoustic tube 10 to the slit (side sound wave introduction opening) 11 formed on the side surface of the acoustic tube 10. More effective flocking treatment may be applied to the surface as a measure against wind noise.

  The window screen 20 is a bottomed cylindrical body closed on the front acoustic terminal 10a side, and includes an insertion hole 21 into which the acoustic tube 10 is inserted. The insertion hole 21 may be substantially the same diameter as the outer diameter of the acoustic tube 10 or slightly smaller.

  A sliding guide member 30 made of a material having a lower friction coefficient than the material of the window screen 20 (for example, foamed urethane material) is provided in the insertion hole 21 to facilitate the insertion of the acoustic tube 10.

  As the sliding guide member 30, for example, a plurality of strips (preferably perforated plates) of a predetermined width made of a low friction material having substantially the same length as the insertion hole 21 are extended in the axial direction of the insertion hole 21. Although it may be attached to the inner peripheral surface at regular intervals, it is preferably disposed in the insertion hole 21 as a porous cylinder.

  That is, a mesh sheet (or a perforated plate) made of a low friction material having appropriate bending elasticity is rolled into a cylindrical shape and arranged in the insertion hole 21 to form the sliding guide member 30.

  For this purpose, as an example, after the mesh sheet is cut into, for example, a width substantially the same as the inner peripheral length of the insertion hole 21, the mesh sheet has a diameter smaller than the inner diameter of the insertion hole 21 in a metal bar or the like. After being wound and inserted into the insertion hole 21, the winding is released, and the mesh sheet is expanded by its own elastic restoring force and brought into close contact with the insertion hole 21.

  At this time, when the elastic restoring force of the mesh sheet is large, the inner diameter of the insertion hole 21 is slightly expanded thereby, so that the mesh sheet (slip guide member 30) is more closely attached to the insertion hole 21.

  In this manner, the cylindrical slide guide member 30 can be easily disposed in the insertion hole 21, but the slide guide member 30 may have a C-shaped cross section in the expanded state. A mesh sheet suitable for the sliding guide member 30 is, for example, a polyester strong net TB15 (trade name) manufactured by NBC Industrial Co., Ltd.

  The sliding guide member 30 may be disposed over the entire length of the insertion hole 21, but in order to hold the sliding guide member 30 more securely in the insertion hole 21, except for the inlet end portion 21 a on the side where the acoustic tube 10 is inserted. Thus, it is preferable that a recess 22 having a diameter slightly larger than the inner diameter of the insertion hole 21 is formed on the inner peripheral surface of the insertion hole 21 and the slip guide member 30 is disposed in the recess 22.

  In this case, a high-friction cylindrical portion 21b made of a urethane foam material or the like in which the concave portion 22 is not formed is left on the inlet end 21a side of the insertion hole 21, and the cylindrical portion 21 is directly directed to the acoustic tube 10. Since they are in contact with each other, the cylindrical portion 21 acts as a means for preventing the acoustic tube 10 from coming off.

  According to the above-described configuration, since the low-friction sliding guide member 30 is provided in the insertion hole 21 of the wind screen 20A, it can be easily attached to the long acoustic tube 10.

  Further, when the slide guide member 30 is cylindrical, the slide guide member 30 also functions as a sleeve member that reinforces the inner peripheral surface of the insertion hole 21, so that the wind screen 20A is prevented from being deformed during storage.

  In the preferred embodiment of the above embodiment, the guide member 30 is formed by rounding a mesh sheet into a cylindrical shape. However, the outer diameter of the acoustic tube (sound collecting part) is the same as the outer diameter of the acoustic tube using, for example, a hard synthetic resin. An integrally molded porous cylindrical pipe may be used.

1 is a cross-sectional view showing a wind screen according to an embodiment of the present invention together with a narrow directional microphone. Sectional drawing which shows the conventional windscreen with a narrow directivity microphone.

Explanation of symbols

10 acoustic tube 11 slit (side sound wave introduction opening)
20A Wind screen 21 Insertion hole 21a Inlet end 21b High friction cylindrical portion 22 Recess 30 Sliding guide member M Microphone

Claims (4)

In the window screen, which consists of an open-celled elastic body with an insertion hole into which the sound collection part of the microphone is inserted, and is detachably attached to the sound collection part of the microphone,
A window characterized in that a sliding guide member is provided on the inner peripheral surface of the insertion hole along the axial direction of the insertion hole, the friction coefficient being lower than that of the elastic body. screen.   The window screen according to claim 1, wherein the sliding guide member is formed in a cylindrical body obtained by rounding a porous mesh sheet.   The total length of the sliding guide member is shorter than the axial length of the insertion hole, and the elastic body directly contacts the sound collection unit at the inlet end of the insertion hole on the side where the sound collection unit is inserted. 3. The window screen according to claim 1, further comprising means for preventing slipping of the friction coefficient higher than that of the sliding guide member.   A narrow directional microphone, wherein the window screen according to any one of claims 1 to 3 is placed over a sound collecting portion of the microphone.

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