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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are cross-sectional views of a
conventional coaxial two-way speaker, and FIG. 3 is a cross-sectional view of the coaxial twouniversal binicker of the present invention. 29 is a hemispherical shell piezoelectric ceramic.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to the improvement of a
coaxial two-way speaker. As shown in FIG. 1, the conventional coaxial type two-way speaker has
a high-tone horn-type speaker 2 disposed in the center space of a cone paper la of the bass
reproduction speaker l, or as shown in FIG. A so-called double-cono type speaker 31 in which the
high-tone corn paper lb is joined to the central part of the corn paper 1a. Further, there is a
system (not shown) in which cone paper for low-pitched sound and cone paper for high-pitched
sound are coaxially arranged and driven by independent magnetic circuits. In such a
conventional coaxial speaker, the first one increases the cost of the speaker as a result of using
an expensive horn speaker, and the horn speaker has a drawback that it is not possible to obtain
a wide directional mark as well known. In the second one, since the drive unit is shared, the
design of the drive unit is difficult, and the reproduction frequency can not be extended
sufficiently to the high frequency due to the increase in the inductance of the mass voice coil of
cone paper for bass. In addition, cone-shaped speakers are better in directional custom than in
horn-type speakers, but still exhibit sharp directional custom in the high frequency range. In the
third one, the construction of the magnetic circuit becomes extremely complicated, resulting in
an increase in cost, and also in the directivity there is a gap. In order to solve the drawbacks of
the conventional example, this device is provided with a hemispherical shell-like piezoelectric
ceramic as a dustproof camp at the upper end of a 3-yl bobbin and acts as a high-pitch speaker
by inputting an audio signal to the piezoelectric ceramic. The embodiment shown in FIG. 3 will be
described in more detail below. 21 is a magnetic circuit, 22 is a magnetic gap formed by a plate
of the magnetic circuit 21 and a center pole, 23 is a voice coil wound around the coil bobbin 24
and disposed in the magnetic gap 22; 25 is a coil for supporting the coil bobbin 24 Danoper, 26
is a bass cone paper coupled to the upper end of the coil bobbin 24, 27 is a frame for supporting
the outer peripheral portion of the cone paper 26 via the Eno / 28, 29 is the upper end of the
coil bobbin 24 or bass cone paper A hemispherical-shell-shaped piezoelectric ceramic member
30 coupled to the central portion of the numeral 26 is an input terminal for inputting a voice
signal to the voice coil 23, and is electrically coupled to the voice coil 23 by a lead 33. .
Reference numeral 31 denotes an input terminal r- for inputting an audio signal to the electrodes
provided on the front and back sides of the half-shell piezoelectric ceramic 29 for Ail, and is
electrically coupled by the electrode and the lead 34).
The voice signal input to the input terminal is preferably a signal previously divided into a high
band signal and a low band signal by the network, but the same full band signal is input in
parallel to the inner input terminal 30.31 without using the network. However, the effect can be
sufficiently obtained. According to the above configuration, a coaxial two-way speaker is formed
in which a high-tone speaker made of hemispherical shell piezoelectric ceramic is disposed at the
center of the cone-shaped speaker. When the divided signal is input to the inner input terminal
30.31, the bass cone paper 26 and the piezoelectric ceramic 29 both vibrate in the low frequency
band due to the vibration of the voice coil 23, and a sound wave is radiated into the atmosphere.
Do. Then, in the high frequency range, no sound wave is emitted from the bass cone paper 26,
and the sound wave is emitted by the imaging movement of the piezoelectric ceramic 29. Also,
even when the same signal is input to both terminals 80.31, vibration does not occur at
frequencies higher than the frequency determined by the pitch of the root of the low-frequency
cone paper 26) 1/2, 5 tinones, etc., and this frequency band Here, the sound waves are emitted
mainly by the vibration of the piezoelectric ceramic. The speaker according to the invention of
the above construction is such that it emits high-range sound waves by the vibration of the
hemispherical shell-like piezoelectric ceramic 291. Therefore, the construction is extremely
simple and the cost is low. Also, since the hemispherical shell-like piezoelectric ceramic 29
vibrates almost as a breathing sphere, the radiation direction is extremely wide, and the
directivity in the high range can be made broad. Furthermore, as a matter of course, the
piezoelectric ceramic 29 acts as a dustproof cap, and foreign matter can be prevented from
entering the magnetic gap 22. As described above, according to the present invention, the
dustproof cap of the low-cost corno type speaker is formed of the hemispherical shell-like
piezoelectric ceramic 29, and the means for inputting an audio signal to the hemispherical shell
1f electric ceramic 29 (lead 34) By providing the input terminal 31)], by making the
hemispherical shell piezoelectric ceramic into a high-intensity radiation speaker, low-cost, highfrequency reproduction ability is sufficient, and directivity characteristics in the high region Can
provide a good coaxial type two-way speaker.
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