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FIELD OF THE INVENTION The present invention relates to an acoustic device that can be used
in a television receiver. 2. Description of the Related Art In recent years, television receivers have
a remarkable tendency to convert their shapes into digital ones, and among such tendencies, the
space for arrangement of speakers has become a problem. In addition, when there is no space for
arranging the speaker on the front side for compacting, if the speaker is arranged on the side,
there is a disadvantage that the sound quality is not good because of the directivity of the
speaker. SUMMARY OF THE INVENTION It is an object of the present invention to provide an
audio device which can be configured with a speaker on the front and does not require a space
for the speaker in the conventional control panel. Configuration of the Invention According to the
present invention, a piezoelectric element is attached to a part of a front plate formed of a
transparent material such as glass or resin provided on the front of a Braun tube, and the front
plate is vibrated by adding an audio signal to this piezoelectric element. It is something that is
made to Description of the embodiment FIGS. 1 and 2 show an embodiment of the present
invention. A drive unit 2 is provided at the lower part of the front panel 7 disposed on the front
of the cathode ray tube 1. The drive unit 2 is formed by bonding the piezoelectric elements 3 and
4 and the electrode plate 5 to the front panel 7 with an adhesive 6. The piezoelectric elements 3
and 4 are stacked according to the size of the front panel 7 to secure the power. The driving unit
2, the twin piezoelectric elements 3, 4. When voice (ii is input, compressive stress and tensile
stress are generated in the piezoelectric elements 3 and 4, and distortion occurs. The distortion is
transmitted to the front panel 7, the front panel 7 vibrates, and the air vibrates to emit sound.
The combination of the piezoelectric elements 3 and 4 is combined so as to generate distortion in
the same direction. As described above, according to the present invention, since the front panel
of the CRT is a diaphragm, a compact set can be realized, the sound pressure is higher than that
of the side speaker, and a good sound quality is obtained Can.
Brief description of the drawings
FIG. 1 is a plan view showing an embodiment of the acoustic device of the present invention, and
FIG. 2 is an enlarged sectional view of the main part thereof.
3.4 · · · · · · Piezoelectric element, · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · front panel. Name of Agent
Attorney Nakao Toshio Other 1 person Figure 1 Figure 2