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JPS5050336

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DESCRIPTION JPS5050336
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a prior art example, the cross section A in
which the central hole is provided in the magnetic pole FIG. 2 is the prior art example in which
the central hole テ ー パ ー taper of the magnetic circuit ball is provided FIG. 1 is a longitudinal
sectional view in which a large number of small holes are provided on the outer periphery of an
axial center portion of a magnetic circuit pole having a central hole in the electro-acoustic
transducer of the present invention. FIG. 4 is a longitudinal cross-sectional view in which a large
number of small holes are also dispersed in the axial direction on the outer periphery of a
magnetic circuit ball having a central hole in the sleepiness acoustic transducer of the present
invention, and FIG. 5 is shown in FIG. Fig. 2 shows a mode of a fundamental wave of air column
resonance generated in a central hole of a conventional magnetic circuit ball. FIG. 6 shows a
mode of a fundamental wave of air column resonance generated at 'iA in the magnetic circuit ball
of the present invention shown in FIG. FIG. 7 is a diagram showing respective frequency
characteristics of the sleepiness acoustic conversion device according to the prior art and the
present invention. 21 ----- 姻気 circuit pole, 22 ...... center hole, E · · yoke, E [Le, 32 ...... center hole,
34 ...... stoma. + 11]; + z mouth-79 one open 50-50 336 (2) + 515 middle 61 swords 809-one → l
series & (# fv) five pi l mocs storage 70-(capital) one
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved
electroacoustical replacement device to prevent resonance caused by holes in the center of a
magnetic circuit pole. In the case of a dome-shaped speaker or the like, a deep hole or a throughhole is provided at the center of the magnetic circuit pole in order to widen the low-range
reproduction limit, and in the cone-shaped speaker to avoid large changes in pressure in the
center cap. However, due to this hole, resonance occurred and the frequency characteristic
deteriorated. Therefore, as shown by the conventional company, the first WJK, the force
absorbing material 13 was put in the hole 2 at the center of the ball 1 to hold the resonance. A
large amount of sound absorbing material is required to cool down the L [and complete
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resonance, so that the air does not flow freely in the holes, and it becomes meaningless to
provide the holes. In the prior art, as shown in FIG. 2, a tapered hole 15 is provided at the center
of the magnetic circuit ball 14 and a single resonance is generated. Also, in the case of fineness,
effectively one size was not sanded with a taper, and when one of the tapered holes became
extreme KJll <, the air flow worsened and a sufficient effect could not be obtained. The present
invention has been made to solve the conventional drawbacks, and the object of the present
invention is to provide a large number of small holes on the outer periphery of a magnetic circuit
ball having a central hole and to provide the inside of the central hole of the magnetic circuit ball.
The present invention provides an electric-blue converter that prevents the resonance occurring
in Next, an embodiment of the present invention will be described in conjunction with the
drawings. In FIG. 3, 2) is a magnetic circuit ball having a center F, 22 as shown. A large number
of small holes 24 are provided around the central hole 22ON4 at the axial center of the magnetic
circuit ball 2 '. The central hole 220 of the magnetic circuit ball is scraped l! Small holes 24 # i,
caustic pots 25. マグネット26. A hole is made to communicate with the air chamber 28
which is turned by the plate 27, and the air company freely enters and leaves. KWk sound
material in the center hole 22 23. The sound absorbing material 29 is also provided in the air
chamber 28 respectively. In FIG. 4, 3 is a magnetic circuit ball having a central hole 32. As shown
in the figure in the axial direction of the magnetic circuit ball 310, the small holes 34 are
appropriately dispersed and provided. Incidentally, the small holes 34 provided with the central
holes 321F) jlllK of the magnetic circuit pole, the yoke 25. A hole is formed in communication
with the air chamber 28 surrounded by the magnet 26 and the plate 27 so that air can freely
flow in and out. In the air 28 is a sound absorbing material 29. The air column resonance
generated in the center hole 13 of the magnetic path pole shown in FIG. 1 becomes a
fundamental wave as shown in FIG.
The air column resonance generated at the central hole 22 of the magnetic circuit pole having
the small holes 24 in FIG. 3 is twice the frequency of the fundamental wave as shown in FIG.
Therefore, it is very small compared to the sound absorbing material 23 butterfly which is
inserted for suppressing this resonance, so the air flow is well provided with a hole in the center
of the ball, which does not prevent the original purpose (3). Further, when the small holes 34 of
the central hole 32 of the magnetic circuit pool 3 are appropriately dispersed in the axial
direction and provided in the cheek shown in FIG. 4, the distributed constant in the small hole
equivalent circuit of the central portion of the magnetic circuit ball. 9, the circuit does not have a
specific resonant frequency. Therefore, the need for a sound absorbing material in the center
hole 320 is eliminated. When air column resonance occurs, the particle velocity of air is
maximized at the position of the small hole 24. Therefore, when the sound absorbing material 29
is put in the air chamber 28, this resonance can be effectively damped. In order to prevent the
small holes 24 and 34 shown in FIGS. 3 and 4 from being combined with the air chamber 28 and
realigned as one hole, the @ sound material 29 is introduced into the air chamber 2BK. The
frequency characteristics are shown in FIG. A solid line 40 is a frequency characteristic of a
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speaker using a conventional magnetic circuit ball. The dotted line 41 has very good
performance in the frequency characteristic of the speaker using the magnetic circuit ball of the
present invention. As described above, 1) The resonance part by the conventional company
magnetic (R) path ball is in the periphery of the diaphragm, and the lift of the diaphragm is
increased or decreased by the part # 1 of the same. Was St. However, since the electro-acoustic
transducer device company of the present invention (4) devised to prevent air column resonance
at the center hole of the magnetic (R) path ball, the frequency characteristics became very good.
This is particularly effective when used for a dome-shaped speaker etc., and may be used for
other speakers and microphones, and there are some which become large.
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