Piezoelectric acoustic speaker system
First Claim
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1. A piezoelectric acoustic speaker system comprising:
- a cylindrical substructure assembly;
at least one piece of piezoelectric film and a holding means connected to adjacent film ends and engaged with said cylindrical substructure assembly to hold said film around the substructure assembly under a predetermined tension and in the form of cylindrical diaphragm;
pairs of electrodes, each having an electrode on the outside of said diaphragm and a further electrode on the inside of said diaphragm, and forming vibration regions of number corresponding to the number of electrode pairs, at least two said independently responsive electrode pairs being circumferentially offset on said cylindrical substructure;
input terminal means for receiving an acoustically reproduceable, alternating input signal;
alternating signal path means establishing a first connection of said input signal terminal means to the electrodes of said at least two electrode pairs for applying alternating input signals related in a first magnitude and phase relation to said two electrode pairs;
switch means interposed in said alternating signal path means and switchable to instead establish at least one differing second connection of said input signal terminal means and pair electrodes for applying alternating input signals related in a second and different relation to said electrode pairs, thereby differently directing sounds reproduced by said speaker system.
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Abstract
A Piezoelectric speaker system with a piezoelectric diaphragm supported in a cylindrical form and provided with a plurality of vibration regions, which is capable of controlling the directional characteristics by easy operation according to necessity or listener'"'"'s preference.
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Citations
14 Claims
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1. A piezoelectric acoustic speaker system comprising:
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a cylindrical substructure assembly; at least one piece of piezoelectric film and a holding means connected to adjacent film ends and engaged with said cylindrical substructure assembly to hold said film around the substructure assembly under a predetermined tension and in the form of cylindrical diaphragm; pairs of electrodes, each having an electrode on the outside of said diaphragm and a further electrode on the inside of said diaphragm, and forming vibration regions of number corresponding to the number of electrode pairs, at least two said independently responsive electrode pairs being circumferentially offset on said cylindrical substructure; input terminal means for receiving an acoustically reproduceable, alternating input signal; alternating signal path means establishing a first connection of said input signal terminal means to the electrodes of said at least two electrode pairs for applying alternating input signals related in a first magnitude and phase relation to said two electrode pairs; switch means interposed in said alternating signal path means and switchable to instead establish at least one differing second connection of said input signal terminal means and pair electrodes for applying alternating input signals related in a second and different relation to said electrode pairs, thereby differently directing sounds reproduced by said speaker system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A piezoelectric speaker system comprising a cylindrical substructure assembly;
- one or more piezoelectric film with holding means connected to the both ends of the or each film;
said holding means being engaged with said cylindrical substructure assembly to hold the or each film around said substructure assembly while imparting a predetermined tension the the or each film, thereby to form a cylindrical diaphragm; and
a plurality of electrodes provided on each side of the diaphragm to form vibration regions of number corresponding to the number of said electrodes, input terminal means for receiving an input signal to be reproduced by said speaker system;
means interconnecting said input terminal means and electrodes and including switching means actuable for switching the interconnection of at least one said electrode with respect of said input terminal means as to at least one of input signal phase and amplitude and thereby permit the user to vary the directionality of sound produced by the speaker system. - View Dependent Claims (12, 13, 14)
- one or more piezoelectric film with holding means connected to the both ends of the or each film;
Specification