close

Вход

Забыли?

вход по аккаунту

JPS55142085

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS55142085
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 one embodiment of the
present invention, and FIG. 3 is one embodiment of the present invention It is the characteristic
view which compared the sound pressure-frequency characteristic and intermodulation
distortion about the conventional coaxial speaker. 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 low-pitch speaker using a ring-shaped flat diaphragm to flatten
sound pressure-frequency characteristics to form a coaxial speaker, ring-shaped. The present
invention relates to a speaker device in which a sound absorption layer is provided on the front
surface of a flat bass diaphragm to reduce intermodulation distortion. Conventionally, in the
coaxial speaker, a high sound speaker is disposed at the center of a bass speaker using a paper
cone made of a natural fiber having a cone shape in general, and a speaker is provided with -ζfil
'"/ 72. 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. Because of the cone shape, a large peak
self-dip on the sound pressure-frequency characteristics due to the concavity effect of the cone
has always occurred in the low-pitched speaker itself as well as in the piston vibration region.
The frequency at which this peak dip occurs is degraded before the diaphragm vibrates, which is
02-05-2019
1
a major drawback of the cone-shaped speaker. In addition, it is generated from the high-pitched
speaker and the radiated sound is blown into the low-pitched speaker? (2) S: 0-interference is
likely to occur, the flatness of sound pressure-frequency characteristics and the characteristics of
the high-pitched speaker deteriorate, and the magnitude of intermodulation distortion is different
between the bass speaker and the high-pitched speaker It has the disadvantage of being quite
large compared to what was placed. This invention is considered in view of the above points. This
invention will be described below. The second time is a side sectional view showing one
embodiment of the present invention, the same reference numerals as in FIG. 1 indicate 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.
Then, the high-tone speaker is coaxially disposed substantially at the center of the low-tone
speaker. 13 is a ring-like flat plate provided on the front surface of the bass diaphragm 11 for
preventing the intermodulation distortion from increasing due to the sound emitted from the
treble speaker being radiated into the bass speaker It is a sound absorbing layer that absorbs
frequency, and is made of, for example, urethane foam.
Next, the action will be described. First, the cause of the intermodulation distortion day (3) f wage
may be considered as follows. ■ Amplitude modulation distortion caused by non-linearity of the
speaker itself. ■ 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 sound diaphragm 3 of the high sound
speaker is absorbed by the ring-shaped flat sound absorbing layer 13 disposed forward of the
low sound diaphragm 11 of the low sound speaker. In the prior art, it is possible to reduce the
intermodulation distortion that occurs due to the above-mentioned items {circle over (1)} and
{circle over (2)} mainly occurring due to the sound of the high-pitched speaker falling into the
low-pitched speaker. Further, in this invention, since the low frequency diaphragm 11 has a ringshaped flat plate shape, the coaxial speaker 7 or f (41) using the conventional cone-shaped low
frequency speaker also in the low frequency speaker itself and the piston vibration region
Compared with the force, it is possible to obtain a flat sound pressure-frequency characteristic.
FIG. 3 shows sound pressure-frequency characteristics and intermodulation distortion (2nd
distortion) in comparison with the speaker device of the present invention and the conventional
coaxial speaker. That is, curves A and B show sound pressure-frequency characteristics of the
embodiment of the present invention and the conventional coaxial speaker, and curves C and D
show intermodulation distortion of the embodiment of the present invention and the
conventional four-axis speaker. is there. 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 CK, in the present invention, the distortion due to cross modulation is small, so the sound
02-05-2019
2
pressure-frequency characteristics are significantly averaged as in 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 substantially coplanar, interference between the
sounds generated from the mutual speakers and the work radiation is relatively small, so that flat
(5) flat sound pressure-frequency characteristics can be obtained. Furthermore, by providing a
sound absorbing layer that absorbs high frequencies on the front surface of the bass diaphragm,
it is possible to reduce intermodulation distortion and the like.
02-05-2019
3
1/--страниц
Пожаловаться на содержимое документа