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JPS53136823

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS53136823
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
electromagnetic electroacoustic transducer, and FIG. 3 is a cross-sectional view showing an
embodiment of the electromagnetic electroacoustic transducer of the present invention. is there.
15 и и и и и и и и и и и и и и и и и и и и и plate и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и 20 и и и ......... ... sound L27 ииииии partition plate, 30 ... ... outside of the case, 31 ...... sound emission
hole.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetostrictive
type "three air acoustic transducer" having many cavity resonant circuits. 2WA4-rp-y,> 4-, e), E2
Recently, electromagnetic electroacoustic transducers have come to be used for various alarms of
portable devices. As such an electromagnetic electroacoustic transducer, one that is loved by
sound quality and frequency characteristics is required. A conventional electromagnetic
electroacoustic transducer of this type has been configured as shown in FIG. 1 and FIG. First, as
shown in FIG. 1, a ring-shaped magnet 3 and a coil 4 fitted between the center pole 1 and the
magnet 3 are disposed on a plate 2 provided with the center pole 1, A support 5 is provided, and
the peripheral portion of the diaphragm 7 is held by the upper surface step 6 of the support 5,
and the terminal plate 8 on the upper surfaces of the support 6 and the diaphragm 7 and the
lower surface of the support 5 is broken. Thus, the outer case 9 is covered, and the sound
emission hole 1 o is provided on the upper surface of the outer case 9 corresponding to the
diaphragm 7. According to this configuration, the sound obtained from the diaphragm 7 is
radiated to the acoustic space between the outer case 9 and the diaphragm 7 and emitted
straight from the sound emission hole 10) =! There is a disadvantage that the sound quality and
frequency characteristics that can be sufficiently satisfied can not be obtained. In addition, what
is shown in FIG. 2 is the one shown in FIG. 1 by covering the inner case 11 on the plate 2
provided with the center pole 1, the magnet 3, the coil 4, the support 5, and the diaphragm 7.
They are disposed in the opposite direction, and the outer case 12 is covered with a fixed
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distance between the case 11 and the support 6 so that sound is emitted from the sound release
hole 13 on the upper surface of the outer case 12 It is. That is, the sound generated by the
diaphragm 7 is emitted to the inside of the terminal plate 8 supported by the outer case 12
through the sound emission hole 14 of the inner case 11, and thereafter, between the side
surfaces of the outer case 12 and the inner case 11 Further, the space between the upper surface
of the outer case 12 and the plate 2 is emitted to the outside from the sound emission hole 13.
Since the sound is radiated to the outside through many acoustic spaces as described above, the
sound quality and the frequency characteristics can be made excellent, but as the workability in
assembly is clearly apparent from the above-described structure D And it is disadvantageous in
measuring 4 ░ mass production. The present invention eliminates the above-mentioned
conventional drawbacks. Hereinafter, the present invention will be described with reference to
FIG. 3 of one embodiment. A plate 15 is provided with a center pole 16 at the center of the upper
surface. A coil 17 is attached to the center pole 16 of the plate 16, and a ring-shaped magnet 18
is disposed around the coil 17. A support 20 is disposed around the magnetic circuit 19 which
constitutes 19 and the magnetic circuit 19 and the support 20 are bonded by an adhesive 21.
A diaphragm 22 made of a magnetic material is disposed at the upper end of the support 20, and
a cab-like inner case 23 is put on the upper portion of the support 20 so as to have a fixed space
of the diaphragm 22. . On the upper surface of the inner case 23 facing the diaphragm 22,
several supporting pieces 26 are provided so as to project upward from the cut-and-raised piece
for providing the sound output hole 24) 5) A partition plate 27 having a sound emission hole 26
around the edge of the gutter 25 is disposed. The terminal plate 29 provided with the terminals
28 is disposed on the lower surface of the support 20, and the support 20. The partition plate 27
and the terminal plate 29 are fixed by an outer case 3 o which is covered so as to cover the
whole. A sound emitting hole 31 is formed at the center of the upper surface of the outer case
30. According to such a configuration, an acoustic space is formed between the diaphragm 22
and the inner case 23, between the inner case 23 and the partition plate 27, and between the
partition plate 27 and the outer case 30, and the sound radiated from the diaphragm 22 is The
noise is finally emitted to the outside from the sound release hole 31 of the outer case 30
through the above-mentioned many spaces, and the sound quality and the frequency
characteristics can be made stable and excellent. In other words, the diaphragm 22 is well-dipped
7 to flatten and improve the wave number characteristics for sound pressure, and the sound
quality is also improved by suppressing the sticking of the diaphragm 22 and the like. In
addition, even in the case of assembling, the support 20 having the tower 19 fixed thereto is
disposed on the terminal plate 29, the inner case 23 is covered on the support 20, and the
partition plate 27 is disposed on the inner case 23) 6. (It is easy to assemble because it is only
covered by (the outer case 3 ░, which is advantageous in terms of mass productivity. As
described above, since the electromagnetic type electroacoustic transducer of the present
invention is configured, sound quality and cylinder wave number characteristics become vague,
and it has advantages such as being able to be offered at low cost because of productivity. It
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becomes a dog of both practical values.
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