JPS5020626

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DESCRIPTION JPS5020626
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an embodiment of the
invention of this application, and FIGS. 2 and 3 are sectional views of other embodiments. E
peripheral part, 5A, 5B. 5C ··· · · · · · truncated cone surface, 6A, 6 = B, 6C · · · · · · · opening. Season
/ Ship bar Feb. -61--Actual opening 50-20626 (2) Shore 3 Figure. . 11-62 1
DETAILED DESCRIPTION OF THE INVENTION The device of this application relates to the
improvement of the microphone, and aims to obtain a good directivity with a simple
configuration. The configuration of this application will be described with reference to the
embodiment shown in the drawings. An acoustoelectric converter 3 is attached to the center of
the substrate 1 so that the diaphragm 2 is at the front, and the front edge 4 of one substrate 1
has a large t1-truncated circular surface 5A 1) Attach the bottom circumference A so that the
head 6 mm is on the front axis of the double acting plate 2, and in front of it, make a small apex
angle slightly smaller than the apex angle of this face 6 mm. The bottom surface is joined and
attached 8 in such a way that one surface III is further truncated in front of it and the partial
surface go is truncated so that the openings 6B and 60 have the shape of the front axis of the
diaphragm 2. A rear cover 9 is attached to the rear surface of the substrate 1 as shown in the
drawing, and a sound absorbing material IOm, lOB, 100 is attached to the bottom peripheral
portion of the truncated conical surface. Since the device of this application is configured as
described above, the sound in the front reaches the diaphragm 2 of the acousto-electric
converter 3 as it is, but the sound in the direction slightly shifted from the front axis is shown by
the chain line in the figure. First of all, it is reflected on the outer surface of the circular surface
and then reflected on the inner surface of the front conical surface, and then it spreads outward
sequentially and finally reaches the front peripheral edge of the substrate l , LoB '(t4), it can not
reach the diaphragm 2 because it is absorbed by the lOO, and therefore, it is possible to obtain
extremely sharp directivity. The company shown in FIG. 2 uses the same apex angle as the
truncated cone surface, and changes the interval and also covers the area of the opening, and the
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one shown in FIG. The sound absorbing material of the bottom peripheral base IO of the
truncated conical surface 5 is abolished, and a sound absorbing material layer is formed on the
inner and outer surfaces of the truncated conical surface of the substrate l and the previous time
of the substrate l to give sound absorption. As in the example of * m shown in the figure, it is
possible to obtain a sharp directivity. Although the example illustrated what attached three
truncated cones in all the examples, in the case where the directivity is not so good and good-it
can be one sheet, and it requires more drastic directivity. Sometimes, several more can be used.
In addition, as illustrated in FIG. 2, it is possible to attach and detach the truncated conical
surface by screwing and detaching the truncated conical surface so as to obtain wide directivity
as required. is there. As described above, the configuration of the invention of this application is
extremely simple, can be obtained with any directivity, and can be made a good directivity
without special precision machining, so it is inexpensive It can be supplied.
In addition, although the truncated circle one side was used as an example and O was illustrated,
it is the same effect also as a square nine-sided tortoise such as a square corner, a square corner
and so on.
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