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JPS57119999

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DESCRIPTION JPS57119999
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an embodiment of a
speaker according to the present invention, FIG. 2 is a side view of the embodiment, FIG. 3 is a
sound pressure frequency characteristic diagram of the speaker, FIG. FIG. 5 is an explanatory
view of sound pressure frequency characteristics in the speaker 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 metal plate, 3 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 4 и и и и и и и lead wire lead.
DETAILED DESCRIPTION OF THE INVENTION The object of the present invention is to provide
an excellent speaker having a relatively flat sound pressure frequency characteristic in an audio
frequency band with a simple configuration and a product using a piezoelectric element. It is In
general, a speaker is known in which a piezoelectric element is attached to a suitable film-like
vibrating force root, but this god's one has only b attached a piezoelectric element to a gold-made
diaphragm. Sound pressure characteristics at low frequencies of 1 to 2 KHz or less are lower
than sound pressure characteristics at area frequencies higher than that at 1 KHz. Most practical
problems ? ~ This proposal eliminates the conventional defects as described above 10j ', l + / / /
2 ","-2, as a speaker for the whole band with a simple configuration It is intended to provide an
excellent speaker with sufficient practicality = J ability. Hereinafter, the speaker of the present
invention will be described with reference to the drawings. In the figure, 1 is a diaphragm made
of a synthetic resin material such as polyester or polypropylene, 2 is a metal plate bonded to the
central portion of the vibrating rod 1, and 3 is a piezoelectric element bonded to the central
portion of the gold plate 2. , 4 are lead wires for electrode extraction. 1-set hi example (Now, the
diaphragm 1 is 0.1 ? thick. The central part (/ 0.1 mm thick + 0.1 + Il + I +, 1 + 7 gold from
phosphor bronze 50 mm in diameter (и, [i temporary 2 is further laminated and this metal plate 2,
') central part made of polyester film of 60 mm in diameter In this case, it is assumed that a
speaker is constructed by adhering piezoelectric ceramic ? ? 3 of diameter 26 in order of
thickness 0.2 and diameter 26. In this case, as shown in the ana, 500 Hz-1600 Hzf и two (3), it is
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possible to obtain a sound pressure which is relatively high and bite. In the conventional
loudspeaker of FIG. 3 b) ? ? ?, it was not possible to make a bar that is too large over both the
low-order and convex regions, but in the above embodiment 0813 иии. According to the invention,
it is possible to obtain extremely excellent sound pressure frequency characteristics. By the way,
in the above embodiment, a polyester film having a thickness of 0.1 ++ ll ++ and a diameter of 6 o
is used as the diaphragm 1 made of synthetic resin, but the thickness of the diaphragm 1 is oJ
ability to be selected as a sound carrier For example, as shown in FIG. 4 a, when the j?l
thickness is reduced (the resonance mode becomes strong and the peak and valley on the sound
pressure frequency characteristics become larger, and as the thickness is increased, FIG. As
shown, when the sound pressure frequency characteristics are flat and close and thick, the sound
pressure itself is lowered to L shown in FIG. 4C.
Therefore, when the diameter of the temporary lead 1 is selected to be about 30 to 90 ((-1) it is
desirable that the thickness is selected to be about 0.06 to 0.5 doors in reverse. Also, the gold 4
plate 2 is made to act as a part of the vibrating rod together with the diaphragm 1 and its
material, 1) base, Noah, etc. have a large shadow on the sound pressure 8. Give a minute. In other
words, the metal plate 2 and the vibrating plate 1 are circular and circular (when C is formed, the
change in the sound pressure frequency characteristics with respect to the thickness is
approximately 108: x4 as the change in the sound pressure mantissa characteristics with the
thickness of the vibration 1 Become. When the diameter is reduced by 1 @@ and b is present, as
shown in FIG. 6 a, b and c in this order, the smaller the diameter is, the lower the lowest
resonance frequency is. As for the shape of the metal plate 2, a relatively simple shape is carheavy, for example, if it is made a complicated shape, the valleys on the sound pressure
frequency characteristics become larger by males, и и и by the high-order vibration mode. There's a
problem. That is, the $ ? S plate 2 is desirably circular, and when using it as a nominee for the
diaphragm 11 made of 11 ? fat, a thickness of about 0.03 to 0.16 mn ++ and a diameter of
about 20 to 5 o are suitable. As apparent from the above, it is clear that the speaker according to
the present invention has a smaller plate of gold: 4 '5'-: r; combined with a synthetic 1 ?m fat ?
diaphragm, and a piezoelectric element is attached to the center of this metal plate. It is small in
size, and it is possible to obtain an excellent speaker tie (I can obtain a blind pressure frequency
characteristic over the entire frequency band). Then, according to the present invention, since it
is sufficient to simply support the outer periphery of the resin, P7 ? ? vibration and nfi, the
case where this is attached to the heat exchanger cabinet, etc. 11) is as follows. ! h ': AL' "" at ""
"1" "1"-e4 y) VCMMN kf ')-1 J-C, I hb water, making it a speaker of the head type, j,' on, . It has
many advantages such as 8.16.
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