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JPS55142084

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DESCRIPTION JPS55142084
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing the shape of a
conventional coaxial speaker, FIG. 2 is a side sectional view showing an embodiment of the
present invention, and FIG. 3 is an embodiment of the present invention. FIG. 16 is a
characteristic diagram comparing sound pressure-frequency characteristics and intermodulation
distortion for the conventional coaxial speaker and FIG. In the figure, 3 is a high-tone diaphragm,
4 is a magnetic circuit, 11 is a bass diaphragm, 12 is a magnetic circuit, and 13 is a sound
absorbing layer. The same reference numerals in the drawings indicate the same or
corresponding parts.
DETAILED DESCRIPTION OF THE INVENTION In the present invention, a high-tone speaker is
incorporated in the center of a bass speaker using a ring-shaped flat diaphragm to flatten sound
pressure-frequency characteristics to form a coaxial speaker for bass use. The present invention
relates to a speaker device in which a sound absorption layer is provided at the boundary
between a diaphragm and a diaphragm of a high-pitched speaker to reduce intermodulation
distortion. Conventionally, a coaxial speaker is generally provided with a high-tone speaker at the
center of a low-pitch speaker using paper foon made of natural fibers having a foun shape, so
that 5 cold (1) nimo i /// r 2. 79 79 / い る. This will be described with reference to FIG. FIG. 1 is
a side sectional view showing the shape of a conventional coaxial speaker, 1 is a bass diaphragm
for a bass speaker having a cone shape, 2 is a bass magnetic circuit for driving the bass
diaphragm 1, and 3 is a bass diaphragm. A treble diaphragm of the treble speaker coaxially
disposed substantially at the center of the cone bass loudspeaker, 4 is a treble magnetic circuit
for driving the treble diaphragm 3. The conventional coaxial speaker configured in this way has
the advantage of better localization of the sound since the sound source is in almost the same
part as compared to the speaker system in which the speaker cabinets are separately disposed.
Due to the cone shape, a large peak / dip on the sound pressure-frequency characteristics due to
the depression effect of the cone necessarily occurs in the bass speaker itself as well as in the
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piston vibration region. The frequency at which this peak dip occurs is a major drawback of the
cone-shaped speaker, which is damped before the diaphragm vibrates. In addition, the sound
emitted from the high-pitched speaker is likely to penetrate into the low-pitched speaker and
cause interference (2) □□, which deteriorates the flatness of the sound pressure-frequency
characteristic and the characteristic of the high-pitched speaker, Furthermore, the magnitude of
the K, intermodulation distortion has a disadvantage that it is considerably larger than that in
which the bass speaker and the treble speaker are separately disposed. This invention is
considered in view of the above points. This invention will be described below. FIG. 2 is a side
sectional view showing an embodiment of the present invention, in which the same reference
numerals as in FIG. 1 denote the same parts, and 11 is a diaphragm for bass of a loudspeaker for
bass, which has a ring-like flat plate shape. Reference numeral 12 denotes a bass magnetic circuit
for driving the bass diaphragm 11. The high-pitched speaker is coaxially disposed at the center
of the low-pitched speaker. A cylindrical sound absorbing layer 13 is made of, for example,
urethane foam to prevent the intermodulation distortion from increasing due to the sound
emitted from the high-pitched speaker and radiated into the low-pitched speaker.
Next, the action will be described. First, the causes of intermodulation distortion are considered
as follows. ■ Vibration 振 · · due to non-linearity of the speaker itself (3) Width modulation type.
■ Amplitude modulation distortion due to the directivity of the speaker. ■ Frequency
modulation distortion by doppler effect. Among the causes of the occurrence of the
intermodulation distortion described above, the symbol {circle over (2)} is possessed by the
speaker itself, and the embodiment of the present invention is intended to reduce the
intermodulation distortion mainly due to the causes {circle around (1)} and {circle over (2)}. That
is, since the sound generated and radiated from the high-tone diaphragm 3 of the high-pitched
speaker is absorbed by the cylindrical sound absorbing layer 13 disposed at the boundary
between the low-pitched speaker and the low-pitch diaphragm 11, The intermodulation
distortion that occurs mainly due to the above-mentioned (season, ■ item) that occurs mainly
because the sound of the high-pitched speaker falls into the low-pitched speaker can be reduced.
Further, in this invention, since the low-frequency diaphragm 11 has a ring-shaped flat plate
shape, the sound pressure is lower than that of the coaxial speaker using the conventional coneshaped low-frequency speaker even in the low-frequency speaker itself and the piston vibration
region. A flat frequency characteristic is obtained. FIG. 3 shows sound pressure-frequency
characteristics and intermodulation distortion (2nd distortion) in comparison with the speaker
device of this invention and the conventional coaxial speaker. That is, the curves A and B show
the sound pressure-frequency characteristics of the embodiment of the present invention and the
conventional coaxial speaker, and the curves c and D show the intermodulation φ of the
embodiment of the present invention and the conventional coaxial speaker. . In FIG. 3, the
horizontal axis represents frequency (Hz) and the vertical axis represents distortion factor (dB) or
sound pressure (dB). As shown by the curve C, in the present invention, the distortion due to
cross modulation is small, so that the sound pressure-frequency characteristics are significantly
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flattened like the curve ^. As described above, the present invention uses the ring-shaped flat
diaphragm for the bass loudspeaker, so that the peak dip due to the concave effect of the cone
shape (and the diaphragm for bass and the vibration for treble) Since the plates are nearly
coplanar, there is relatively little interference between the sound emitted from the mutual
speakers, so that a flat sound pressure-frequency characteristic can be obtained. Furthermore,
the provision of the sound absorbing layer in the form of (7), (5) ↓ at the boundary between the
bass diaphragm and the treble diaphragm has the advantage of being able to reduce
intermodulation distortion.
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