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DESCRIPTION JP2000209697

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DESCRIPTION JP2000209697
[0001]
TECHNICAL FIELD The present invention relates to a speaker.
[0002]
A speaker provided with a piezoelectric diaphragm is known as a sound source of a speaker
system. For example, Japanese Utility Model Registration No. 3037167 filed by the present
applicant discloses a speaker structure using a piezoelectric element such as a bimorph as a
sound source of a speaker system. In this speaker, a piezoelectric diaphragm is attached to an
acoustic diaphragm made of a fiber reinforced plastic such as carbon fiber to make a sound
source of the speaker.
[0003]
Although the piezoelectric diaphragm is excellent in particularly high-pitched sound
characteristics, however, the amplitude of the piezoelectric diaphragm is small, so it is difficult to
sufficiently increase the sound pressure of bass using the piezoelectric diaphragm. Met.
[0004]
According to the present invention, there is provided a speaker comprising a piezoelectric
vibrator having a vibration control member disposed on at least one side surface of a flat platelike piezoelectric element attached to an acoustic diaphragm at its central portion. In the speaker
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according to the present invention, the thickness of the acoustic diaphragm is at least 10 mm.
[0005]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a first
embodiment of a portable speaker 10 according to the present invention comprises a
piezoelectric vibrator 50 attached to an acoustic diaphragm 12. As shown in FIG.
The piezoelectric vibrator 50 has a ring-shaped rubber member 54 attached as a vibration
control member on both sides of a piezoelectric diaphragm 52 formed by forming a ceramic
layer on both sides of a circular metal thin plate such as aluminum or stainless steel. It is done.
The piezoelectric diaphragm 52 is attached to the acoustic diaphragm 12 with an adhesive or the
like via the connecting member 56. The piezoelectric diaphragm 52 is attached to the connecting
member 56 by a nut 56 '. The acoustic diaphragm 12 is preferably made of expanded
polystyrene and formed of a plate member having a thickness of at least 10 mm.
[0006]
Referring to FIG. 2, the speaker 20 according to the second embodiment of the present invention
comprises the same piezoelectric vibrator 50 as that of the first embodiment attached to the
acoustic diaphragm 22. The acoustic diaphragm 22 according to the second embodiment has a
side wall 22a extending along the periphery thereof.
[0007]
In the two embodiments described above, the piezoelectric vibrator 50 is described as a bimorph
having a ceramic layer on both sides of a metal plate member, but the ceramic layer may be
provided at least at one side of the metal plate. .
[0008]
In FIG. 2, the piezoelectric vibrating body 50 is disposed on the side surface of the acoustic
vibrating body 22 surrounded by the side wall 22 a, but the piezoelectric vibrating body 50 is
disposed on the opposite side surface of the acoustic vibrating body 22. It may be
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[0009]
According to the present invention, it is possible to improve the bass characteristic of a speaker
using a piezoelectric vibrator and to increase the sound pressure in the bass range.
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