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BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1a and 1b are side views showing the operation
of the piezoelectric ceramic, and FIG. 2 is a perspective view of the present invention. 21 is a
support, 22 is a piezoelectric ceramic, and 23 ° 24 is a lead wire.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a direct emission speaker using a piezoelectric and a ceramic. Piezoelectric ceramic acts as a
piezoelectric body by performing a polarization operation in which the polarization direction of
each domain is aligned by applying a DC voltage in the thickness direction as is well known, and
this thickness direction By applying an electric field to the electrode, the shape is changed to
perform electro-mechanical or mechanical-electrical conversion. Speaker vibration of such a
piezoelectric ceramic-? In order to use it as a 3 υ 2 plate, a bimorph type piezoelectric ceramic
or a first plate in which two piezoelectric ceramic element plates 1.1 are bonded with the same
electrodes facing each other as shown in FIG. As shown in FIG. 2 (.omega., It is preferable that the
piezoelectric ceramic / silicon f-plate 1 is attached to the metal plate 2). This is because the
piezoelectric ceramic having such a configuration vibrates so that its central portion is curved by
applying an AC signal (audio signal) to both electrodes, and as a result, it emits an acoustic wave.
Therefore, in the following description, the piezoelectric ceramic refers to the two configurations.
When adopting such a piezoelectric ceramic for a direct radiation type speaker, the following
drawbacks must be solved. First of all, first of all, since the piezoelectric ceramic has a very sharp
Q at its resonance frequency, the re-main bandwidth is narrow, and the frequency band is
extremely limited, such as tweeter-1 or f1 noise noise. It is an inner cone to adopt it as a speaker
to use for reproduction. 3) Attempts have been made to reduce the Q by spreading an elastic
material such as a butyl rubber plate or the like with large internal loss to one side of a
piezoelectric and ramic, and the band is broadened. , Have a deity. In order to solve the
drawbacks of the prior art, this invention combines wide-range reproduction by combining
beams with different materials, that is, with a plurality of crowns of different resonance
frequencies. The embodiment shown in Fig. 2I1 will be described in detail. In FIG. 2, reference
numeral 21 denotes a support, and a plurality of piezoelectric ceramics (22) made of different
materials are stuck to one surface of the support with a rubber adhesive or the like. A lead wire
23.24 is electrically connected to both sides of the clay ceramic (22) as a signal input means. The
material of the piezoelectric ceramic 22 is one containing barium titanate as a main component,
one containing lead titanate / lead acid titanate as a main component, and C, the other lead oxide
or the material of the other lead titanoate. Piezoelectric ceramics of various characteristics can be
obtained by making them different.
For example, with regard to the above-mentioned frequency constant of the positive electric
ceramic / longitudinal vibration, those of 2280 Hzm 11680 Hzm, 1720 Hzm and 1450 Hzm
exist. When the same voice signal is input to such a piezoelectric ceramic having different
frequency constants, resonance occurs at the unique resonance frequency of each piezoelectric
ceramic 22, and the common frequency is shifted by each pressure ceramic 22. Therefore, it
exhibits a staggering coupling and the regeneration band is expanded. The shape of the
piezoelectric ceramic is not limited to the square as shown in the embodiment, but various
shapes such as circular and short can be taken. Furthermore, the connection of resonance
frequency is smoother by changing the shape and size. In order to be freely designed according
to the purpose 3J or pressure city ceramic is shown in the practical example, it is not limited to
m: m, 配, 配, 曲, ml, etc. 5 An array of can be considered. It is possible to improve directivity by
arranging on a father curve or a spherical surface. According to the configuration of this
invention, broadband reproduction can be achieved without reducing the acoustic radiation rate,
but in order to make the frequency characteristics flat in four, an elastic material such as butyl
rubber is used for the support 21 In this case, as described in the above 3 ° or more, the
frequency characteristic causes a slight decrease in efficiency, but the present invention supports
a plurality of piezoelectric ceramics j) 22 having different frequency constants due to differences
in materials. By arranging in the body 21, the resonance frequencies of the respective
piezoelectric ceramics are coupled in a staggered manner to enable broadband reproduction, and
in particular, it has an advantage most suitable as a high acoustic speaker.
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