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DESCRIPTION JPS57178799

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DESCRIPTION JPS57178799
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing an embodiment of the
piezoelectric speaker according to the present invention, FIG. 2 is a sectional view of the same,
FIG. 3 is a bottom view of a vibrator, and FIG. A bottom view and FIG. 5 are output characteristic
diagrams of the piezoelectric speaker. 1 · · · Case-like speaker body, 6 · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 10 Piezoelectric plate, 13 ..... Radiation diaphragm.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
speaker and to a structure for flattening output characteristics. Generally, the piezoelectric
speaker drive source is a metal plate made of a piezoelectric plate made of a piezoelectric plate
made of fi + 024 /, "',' i '" :)'-zircon, titanium zirconate based piezoelectric magnet. The transducer
has a high natural resonance Q, and the output characteristics of the piezoelectric speaker have
large peaks and valleys on the lower region side as shown in Fig. 6 (-1). There is a practical
problem. Therefore, conventionally, a damping material consisting of a rubber foaming agent
having a thickness of 5 Iu is attached to a vibrator or a radiation diaphragm to suppress the
natural resonance and to flatten the output characteristics. However, if a damping material is
attached immediately to the vibrator or the radiation diaphragm, the purchase of the vibrator or
the radiation diaphragm will increase equivalently, and the output of the piezoelectric speaker is
as shown in FIG. There is a drawback that it drops significantly. The present invention has been
made in view of a single defect, and provides a piezoelectric speaker which can flatten the output
characteristics in the low frequency range without reducing the output of the piezoelectric (twopiece 025 speaker). Next, a description will be given based on the diagram 1 to the diagram of
the structure of an embodiment of the present invention. (1) is a flat cylindrical case-like speaker
main body whose upper surface is opened, and an annular support stepped portion (2) is formed
on the inner peripheral surface of the rod, and a vibrator supporting portion is formed on a part
of the support stepped portion (2) The lead wire lead-out portion (4) penetrating to the outer
surface of the vibrator support portion (3) is formed by the notch 5 (5). Furthermore, the bottom
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eK of the main body (1) is radially formed with an opening 16+, and the opening (6) is formed on
the inside with a cloth having a thickness of 5 mm, an outer diameter of 34 uf) A The acoustic
resistor (7) is attached, and the peak (3) IO2f; D1P with sharp frequency characteristics, and the
attenuation only at the heel part is good. Next K (8) is a vibrator, and a straight surface 112 (1 m,
thickness 0) is formed on the lower surface of a substantially semicircular metal plate (9) made
of a phosphor bronze plate having a length of 20 and a width of 33 諺 and a thickness of α11 II.
Of a zircon-titanium-lead-based piezoelectric ceramic is bonded and structured. A lead wire aJ
convergence is connected to metal 1 [+9+ of the vibrator (8) and the piezoelectric plate,
respectively. There is. Then, the base 3m of the vibrator (8) protruding from the bottom face of
the vibrator (8) is fitted and bonded to the vibrator support 11 (31) formed on the support
stepped portion (2) of the main body (1). It has become. Next, I is a synthetic 4 It Jil film lc ′ ′
c molded sita radiation diaphragm such as polyester l1tjlIi1 having a thickness of 38 μm and a
thickness of 100 μm. This vibration 1 [the center 11 of Q3 the tip 11 of the vibrator (8) A small
hole I is formed correspondingly to the adhesive, and the adhesive (4) 102'7 sweat-slip-roi (I!)
Inserted and dropped from the upper part of the small hole Q.
The diaphragm (13 and the vibrator (8) are coupled at 9). In addition, a radial rib tte is formed on
the diaphragm I, and an inverted conical portion (a weir is formed around the small hole I at the
central portion, so that the vibration characteristic of the high range is adjusted) . Then, the
diaphragm j is made of an adhesive so that its peripheral edge is adhered to the support step 5
(2) of the main body (1). The next is a caulking ring, having an outer diameter fitted to the body
(1), and the vibrator (8) between the ring ridge and the body (supporting step (2) of the body 11)
The diaphragm (13 is adapted to be gripped and held. The operation of the embodiment of the
present invention will now be described. . Since the acoustic resistor (7) formed of an airpermeable cloth covering the opening @ is attached to the bottom of the main body (1), a
conventional vibrator (a weir or a diaphragm (13 (5) 10? No increase in mass as in a pigeon
attached with crater, and sharpening by natural resonance as shown in FIG. 16 (C) without
lowering the overall low level of output%. Only the mountain can be attenuated. Further,
although the dustproof function is also performed at 5 °, in the above embodiment, the pigeon
having the acoustic resistor (7) rubbed with a cloth has been described, but it can also be formed
of urethane foam, felt, non-woven fabric or the like. In addition, the acoustic resistor (7) exerts
the same function even when attached to the outside of the main body (1), not to the inside.
According to the present invention, it is possible to attenuate only the sharp peaks due to the
natural resonance, to flatten the output characteristics of the speaker, and to perform the
dustproof operation without reducing the entire low frequency level of the output characteristics.
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