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JPS572785

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DESCRIPTION JPS572785
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a line microphone in the
prior art, FIG. 2 is a cross-sectional view of the line microphone, and FIG. 3 is a perspective view
of the line microphone in one embodiment of the present invention. FIG. 5 is a perspective view
of the line microphone, FIG. 5 is a perspective view of the line microphone in an embodiment of
the present invention, and FIG. 6 is a cross-sectional side view of the line microphone. 1 ...... eye
black phone unit, 2 ...... acoustic tube, 2 '...... sound hole, 3 ...... resistance surface cloth, 4 ......
Sound absorbing material, 5 ··· · · · · · · 5 '· · · · · · · · · · sound hole.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a line microphone.
The purpose is to reduce cost by facilitating assembly. 1 and 2 show an example of a
conventional line microphone, in which 1 'is a microphone unit, 2 is an acoustic tube having a
plurality of sound holes 2', 3 is a resistance surface attached to the sound hole 2 '. The cloth 4
represents a sound absorbing material for preventing standing waves. The line microphone
configured as described above has directivity characteristics due to phase interference while the
sound waves entering from each of the sound holes 2 'to which the resistive face cloth 3 is
attached reach the microphone unit 1. The Mino 7 '2 crophone unit 1 is housed at one end of the
acoustic tube 2, and the sound absorbing material 4 is housed at the other end of the acoustic
tube 2. However, since this microphone uses a method such as bonding and fixing to stick the
resistive face cloth 3 and it is difficult to stick the resistive face cloth 3, there is a drawback that
the cost increases. The present invention eliminates the above-mentioned drawbacks, and an
embodiment of the present invention will now be described with reference to the drawings. FIG.
3 is a perspective view of a line microphone according to an embodiment of the present
invention, and FIG. 4 is a sectional view thereof, in which the same parts as in FIG. 1 and FIG.
Description is omitted. What is different from the prior art is that the resistive face cloth 3 has a
plurality of sound holes 5 ′ and is sandwiched between the thin plate 5 along the acoustic pipe
2 and the acoustic pipe 2. In such a case, the resistance surface cloth 3 may not be directly
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attached, but may be fixed to the acoustic pipe 2 with an adhesive or the like through the rib /
thin plate 6 so that the assembly becomes easy. The ideal sound tube of the line microphone is
constituted by the diameter 3 of the sound hole 2 'and the arrangement of the sound hole 2'.
However, as shown in FIG. 5 and FIG. You may form. Incidentally, since the sound holes 5 'of the
thin plate 5 can be formed by a press or the like, even if the number of parts increases, the
difference in cost does not increase. The thin thin plate 5 having a half plate shape is used. Even
if it is made to curve along the outer peripheral shape of the acoustic tube, it may be pre-curved
to facilitate temporary holding of the face cloth by utilizing its elasticity.
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