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JPS5140328

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DESCRIPTION JPS5140328
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an example of a
diaphragm of a conventional piezoelectric speaker. FIG. 2 is a side view of the diaphragm. FIG. 3
is a perspective view of a first embodiment of a diaphragm used in the present invention. FIG. 4
is a side view of the diaphragm of FIG. FIG. 5 is a perspective view of a second embodiment of a
diaphragm used in the present invention. FIG. 6 is a side view of the diaphragm of FIG. 1 ииииии
Diaphragm, 1 ?, 1 ? иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Flexible elasticity;
Foam, 5 ииииии Diaphragm, 51, 5 ? иииииииииииииииииииии Position of diaphragm by expansion and contraction,
6 ? 7 иииии Guide rollers, 8 and 9 ииии? The position of the diaphragm according to 11, 11 и и и и и и и и и и
1st fence 75-real opening 5l-40328 (2) 76-
DETAILED DESCRIPTION OF THE INVENTION The present invention is based on the alternate
repetition of the elongation or contraction of the ? molecular film when an electric field is
applied across the curved 9 ? ? polymer film with opposite electrodes on both surfaces: The
present invention relates to a piezoelectric speaker provided with a vibrating diaphragm. In FIG.
1 and FIG. 12 showing an example of a conventional piezoelectric speaker 0 @ ?, 1 is lightly
held by a flexible elastic filler 4 having opposite electrodes in both parts and which is made of
polyurethane foam. -The diaphragm made of a polymer film with the inner end held down and
fixed by 2 and 3), and when an electric field is applied between the wall surfaces of the wedge
film 1, vibration 1 [1 # 'i point 11111] As shown by the elongation h, as shown, the two truly
shrink and vibrate to generate a sound wave. However, since there is a limit to the elongation of
the polymer film, a large-area vibration part is required to obtain a large amplitude reproduction
with a large output. I can not get a speaker of. Low-pitched resonance frequency that will be the
limit of low-pitched sound reproduction in speakers! , Given an effective mass of the vibration
system ? (1r), and a stiffness of the vibration member support portion 1 и (q? и / am), f @ z bow
// 5 is given. Therefore, in the conventional piezoelectric lid speaker having a diaphragm as
shown in FIGS. 1 and 2, in order to lower the bass reproduction limit, the diaphragm should be
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supported as loosely as possible to reduce stiffness. It is necessary to apply mechanical bias,
adjust the amount of bias and additional mass of the flexible elastic packing 4, or increase the
vibration 910 area. However, if you look at it, it is not possible to obtain a speaker for broadband
reproduction because the directivity characteristic in the high region is deteriorated and the
reduction in high region reproduction OJl is affected. The 113th invention is a piezoelectric lid
speaker having a diaphragm which can be used as a wide band by removing the abovementioned drawbacks. Next, an embodiment of a diaphragm used in the present invention will be
described with reference to the drawings. FIG. 3 shows a first embodiment. In FIG. 4, the
diaphragm 5 made of a bird molecule film having electrodes opposite to each other on both sides
is lightly pressed by a flexible elastic packing 4 made of polyurethane or the like to form a
curved plate. The direction is changed as a flat plate shape by the guide roller 6.7, and the end
portions 2 and 3 are constant and appear. When an electric field is applied between both
surfaces of the diaphragm 5, the expansion and contraction of the plane s 8.9 of the expansion
and contraction of the vibrating rod 1 [5] is the expansion and contraction of a part of the bay
narrowed by the guide rows 26 and 7 In addition to the dotted line in FIG. . 5. It vibrates very hot
as shown in.
In FIGS. 5 and 6 showing the embodiment of FIG. 20II, since it has opposite electrodes on both
sides, it is lightly pressed by the flexible filler 4 made of molecular film i, diaphragm 10a
polyurethane foam etc. The end plates 2 and 3 are fixedly fixed to the end pressers 2 and 3 with
the flat plate rod 11 continuous to the curved portion being thick. When an electric field is
applied between both the cylinders of the diaphragm lO, of the expansion and contraction of the
diaphragm 10 due to the extension of the flat plate portion 11, the both ends of the guaran sc1
are narrow i) the part of the narrow bay is dotted line 1 (k Also, the contraction of the flat
portion 11 causes contraction of the ore curved portion between the two ends of the curved
portion to produce a large vibration similar to that of the first embodiment, as in the case of the
point JIIIO. In the second embodiment, ribs may be provided in the expansion and contraction
direction of the flat plate in order to increase the thickness of the flat plate of the polymer film.
According to the above O communication system, according to the present invention, the area
where the force O is generated in the diaphragm is large but the vibration portion is small, so the
lifting weight can be increased to achieve high frequency reproduction with O high output and 1
swing Low frequency range reproduction% IFa and t, b by increasing the width and reducing the
frequency, it is possible to obtain a piezoelectric lid speaker with more applications than
conventional ones. Note that the diaphragm used in the present invention is! It can also be used
effectively as an ikehon.
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