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JPS542433

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DESCRIPTION JPS542433
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional domeshaped speaker, FIG. 2 is a sound pressure frequency characteristic diagram of the conventional
dome-shaped speaker, and FIG. 3 is a mechanical equivalent circuit diagram of the conventional
dome-shaped speaker Fig. 4 is a cross-sectional view of a dome-shaped speaker according to an
embodiment of the present invention, Fig. 5 is a half-sectional side view of a cap of the domeshaped speaker, Fig. 6 is a mechanical equivalent circuit diagram of the dome-shaped speaker,
FIG. 7 is a sound pressure frequency characteristic diagram of the dome-shaped speaker, and FIG.
8 is a half sectional side view of a cap of another embodiment of the present invention. 1 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 и и и и и и и и и support plate, 6 и и и иииииии Dosquare diaphragm, 7 ииииииииииииииииииииииииииииииииииииииииии Cap, 9, 9 ? иииииииииииииииииииииииииииииииииииииииии Sound absorbing
material.
DETAILED DESCRIPTION OF THE INVENTION With regard to the dome-shaped speaker of the
present invention, it is intended to flatten the sound pressure characteristic in the low frequency
range. FIG. 1 shows a cross section of a conventional dome-shaped speaker. In FIG. 1, 1 is an
inner frame-shaped magne. This magnetor is fixed in the yoke 3 in which the hole 2 is formed on
the upper surface. An annular magnetic gear 4 is formed between the outer peripheral surface of
the center pole 4 and the side surface of the hole 2 of the gore 3. . Reference numeral 6 denotes
a ring-shaped support plate, which is held by the following means: j ':: "inis Ku"-"visaoo" 79-Z3-4.
A voice coil wound on a dome-shaped diaphragm 6 is disposed in the magnetic cap. The abovedescribed conventional dome-shaped speaker has a drawback that the stepped characteristic is
low in the low frequency range, for example, around 2 KHz as shown in FIG. 2, and the flatness of
the sound pressure frequency characteristic is impaired. The generation of the stepped
characteristics of the sound pressure frequency characteristics is due to the following reasons.
FIG. 3 shows a mechanical equivalent circuit of the above conventional dome-shaped speaker. In
FIG. 3, F: 1 driving force, RMU electromagnetic control resistance, Mvs: vibration system mass,
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1
CMS: support system combination 0 resonance, RMS: vibration system mechanical resistance,
CMB: empty room concavity surrounded by dome-shaped diaphragm and center pole 0 Liance,
RMG: voice coil bobbin and center hole gA11) Ii! The air viscosity resistance between, the mass
of air between the 3MIIG voice core rubbo pin and the center pole side. In FIG. 3, since CMB and
MMC are in parallel, anti-resonance occurs near 2 KHz, and this anti-resonance causes a stepped
characteristic. The present invention eliminates the above-mentioned conventional drawbacks,
and an embodiment of the present invention will be described below with reference to FIGS. 4
and 6. In FIG. 5 and FIG. 5, reference numeral 8 denotes a hemispherical cap, and the cap 8 is
fixed to the upper surface of the center hole 4. Reference numeral 9 denotes a through hole
formed in the cap 8, and the outside and the inside of the hole 8 are in communication with each
other through the through hole 9. 10 is a sound absorbing material such as glass wool housed in
the cap 8. As in the first embodiment, the bearing having the through hole 9. In the case where
the duct 8 is disposed at the rear of the dome-shaped diaphragm 6, and the sound absorbing
material 1o is housed in the cap 8, the air flow passing through the through hole 9 is the
viscosity resistance of the through hole 9) and the damping material 1o It becomes 4 that
resistance is loaded.
This means that the viscous resistance R is inserted in series in the compliance CIIB as shown in
FIG. 6, and the resonance Q of the antiresonant circuit by the above CMB and MMa is controlled
by the viscous resistance R. As a result, as shown in FIG. 7, the stepped characteristic is removed
and a flat sound pressure frequency characteristic can be obtained. In FIG. 7, broken lines
indicate the sound pressure frequency characteristics of the dome-shaped speaker shown in FIG.
FIG. 8 shows a cap 8 of a dome-shaped speaker according to another embodiment of the present
invention, and a through hole may be formed on almost the entire surface of the cap 8 as shown
in FIG. In each of the above embodiments, the hemispherical cap 8 is used, but not limited to the
hemispherical cap 8, a curved surface similar to the curved surface of the dome-shaped
diaphragm 6 (not necessarily having the same curvature It is sufficient if it is an empty chamber
having a through hole, and the through hole is formed on the curved surface. As apparent from
the above embodiments, according to the present invention, it is possible to prevent the antiresonance in the low range of the loudspeaker and the dome-shaped speaker by 5 and to flatten
the sound pressure solid wave number feature. It is a thing.
01-05-2019
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