JPS5748780

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DESCRIPTION JPS5748780
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 3 are sectional views of a conventional
microphone, FIGS. 2 and 4 are characteristic views thereof, and FIG. 5 is a sectional view of the
microphone according to an embodiment of the present invention, FIG. 6 is a characteristic view
thereof. 2 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
voice coil, 71.72 ..... Acoustic resistor. Figure 4 Figure 5 1
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a directional
dynamic type microphone, and the purpose of the improvement is to customize. FIG. 1 shows the
structure of a conventional microphone, in which 1 is a base plate, 2 is a magnet, 3 is a yoke
having an opening 4.5, 6.7 d onoyoshi resistor, and 8 large cavity. Fig. 2) What is the
characteristic 2 "of this microphone. As apparent from this characteristic diagram, the directivity
i <t satisfies only a narrow frequency band, and the aperture 6 is made 51, 52 as in the 4t // ·
223] (il), and the acoustic resistor 7 is By setting 71.72, the characteristic as shown in FIG. 4 is
obtained. In this case, the directivity in the low band is improved compared to that in FIG. 1, but
the directivity in the high band: 1 is insufficient. The present invention eliminates such a
drawback, and will be described in conjunction with an embodiment of FIG. In the same figure, 1
to 4, 6.8, 51.52 and 71 ° 72 respectively correspond to the same symbols in FIG. Reference
numeral 9 denotes a lower part of the voice coil 11, and a cavity case made of nonmagnetic
material forming the air chamber 12, and 10 is an opening. FIG. 6 shows the ¥ f property, and
the broken line shows the case where the volume of the air chamber 12 is too small. That is, this
microphone is characterized in that an air chamber 12 is provided on the back of the diaphragm
1. In this case, if the volume of the air chamber 120 is appropriately set, as shown in FIG. 3 Note
that this tip is set 2 cheap to cause this to change with volume. As described above, according to
the present embodiment, the present invention can contribute particularly to the improvement of
handling in six regions.
13-05-2019
1
13-05-2019
2