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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic transducer, and more particularly to an acoustic transducer using a piezoelectric
acoustic transducer.
2. Description of the Related Art As a conventional sound conversion apparatus, a large number
of loudspeakers shown in FIG. 3 connected as shown in FIG. 4 have been provided.
In the figure, 11 is a speaker cabinet, 11a is a front surface of the speaker cabinet 11, 11b is a
hole of a low frequency speaker unit, 11c is a hole of a medium sound speaker unit, 11d is a hole
of a high sound speaker unit, 12 Is a speaker unit for bass, 13 is a speaker unit for mid tone, 14
is a speaker unit for high tone, and 15 is a signal source.
In the conventional sound conversion apparatus, electrodynamic speaker units such as the lowpitch speaker unit 12, the mid-sound speaker unit 13 and the high-sound speaker unit 14 are
respectively inserted in the holes 11b, 11c and 11d of the front surface 11a of the cabinet 11.
This was connected as shown in FIG. 4 to make a multi-way system and to perform sound
For this reason, it is necessary to cover a wide band with one speaker unit, and the resonances of
the low, middle, and high speaker units 12, 13 and 14 are suppressed as much as possible, and
the efficiency is very low.
Also, horns have sometimes been used to improve efficiency.
However, the above-described conventional acoustic transducer has a very low efficiency of
about 1%.
Further, in the multiway system, a filter is required for each band.
Furthermore, those using the horn had to be very large to reproduce the bass.
The present invention has been made in view of the above-described point, and its object is to
solve the drawbacks of the prior art and to provide a compact and highly efficient acoustic
SUMMARY OF THE INVENTION The acoustic conversion device of the present invention is an
acoustic conversion element having a sharp resonance peak at a single frequency, and a plurality
of resonance frequencies are successively different by up to 1/12 octave. The acoustic
transducer of the present invention is vibratably supported on a cabinet.
Also, a piezoelectric element is used as the acoustic conversion element.
According to the present invention, since a plurality of acoustic conversion elements having a
sharp resonance peak at a single frequency and successively different resonance frequencies by
1/12 octaves are supported on a cabinet in a freely vibrating manner. When an audio frequency
signal voltage is applied to the acoustic conversion element, an acoustic signal is output.
Further, a piezoelectric element is used as the acoustic conversion element, and the piezoelectric
elements are connected in parallel as shown in FIG.
conversion apparatus according to the present invention will be described based on FIGS. 1 and
2. FIG.
In the figure, reference numeral 1 denotes a speaker cabinet, 1a denotes a front surface of the
speaker cabinet 1, and 1b denotes holes provided on the front surface 1a for 88 acoustic
conversion elements.
In the present invention, a piezoelectric transducer is used, and 88 acoustic transducer elements
are provided, each of which has a deviation of 1/12 octave or less of the resonance frequency of
each piezoelectric element, as shown in FIG. As shown, they are electrically connected in parallel.
3 is a signal voltage for driving each acoustic conversion element.
As shown in FIGS. 1 and 2, the acoustic conversion device of the present invention configured as
described above includes 88 holes 1b1 for the acoustic conversion element 2 provided on the
front surface 1a of the speaker cabinet 1. The 88 piezoelectric elements 21,..., 288 corresponding
to the holes 1b are vibratably supported at 1b 88 so as to have the same scale as the keys of the
For this reason, 88 piezoelectric elements 2 are used which have sharp single resonance peaks
and whose resonance frequencies sequentially differ by 1/12 octaves.
., 288 are connected in parallel, and when the signal voltage 3 is applied, the piezoelectric
elements 21,..., 288 resonate at the frequency of their respective resonance points, Perform
acoustic conversion efficiently.
At this time, no filter is necessary.
Further, since the reproduction band of each of the piezoelectric elements 21,..., 288 has a
certain width, the frequency shifted from the resonance point can be reproduced to some extent,
and sound can be reproduced sufficiently.
The arrangement of the piezoelectric elements 2 in FIG. 1 may be linear or spiral.
Further, the number of piezoelectric elements 2 may be increased to obtain a wider band, or to
set the resonance frequency more finely than 1/12 octave, and to perform higher fidelity
Conversely, the intervals can be made coarser than 1/12 octaves to make a simple sound
conversion device.
According to the sound conversion device of the present invention, since it is configured as
described above, the resonance can be used and the efficiency becomes very high.
Further, no filter is required, and each piezoelectric element is small, so that miniaturization and
weight reduction can be achieved.
Furthermore, the band and the fidelity can be changed as needed, and the size and the
configuration can be given freedom.
Furthermore, it has excellent features such as easy implementation because of its simple
Brief description of the drawings
1 is a perspective view showing a sound conversion device of the present invention.
2 is a connection diagram of the same device.
3 is a perspective view showing a conventional sound conversion device.
4 is a connection diagram of the same device.
Explanation of sign
1 speaker cabinet 1a front 2 piezoelectric element 3 signal voltage
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jph04105797, description
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