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JPS57100400

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DESCRIPTION JPS57100400
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a conventional piezoelectric
speaker, and FIG. 2 is a sectional view showing an embodiment of the piezoelectric speaker of the
present invention. 6 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Edge paint, 11 · · · · · · ·
diaphragm.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
type speaker in which a cone-shaped diaphragm is connected to a piezoelectric vibrator and
incorporated in a frame, and in particular to provide an easy-to-assemble speaker. . Recently, an
electrode is provided on both sides of a disk-shaped piezoelectric ceramic plate and IHu7yvj; / 62
is coupled, and this is incorporated into a frame. A room type speaker has been developed and
used as a soita. [A typical example of the F room type speaker is shown in FIG. Reference numeral
1 denotes a frame formed in a cap shape of a synthetic resin or the like, and a support protrusion
2 with a sharp upper end is provided on the inner bottom surface of the frame 1. A disc-shaped
piezoelectric vibrator 3 is disposed on the support projection 2 and is bonded by a visco-elastic
adhesive. The support point of the piezoelectric vibrator 3 by the support projection 2 is a nodal
circle of the primary resonance frequency. The top of the diaphragm 7 in the form of a ca 7 is
connected by contact to the central portion of the upper surface of the vibrator 3 and the
peripheral edge of the diaphragm 4 is connected to the upper end of the peripheral edge of the
frame 1 There is. In such a piezoelectric speaker, the piezoelectric vibrator 3 and the diaphragm
4 which are adhesively bonded in advance are assembled by adhesively bonding to the
supporting protrusions 2 of the frame 1 and the peripheral portion of the frame 1) 117: 3 In this
configuration, it is difficult to incorporate the diaphragm 4 into the frame 1 in such a manner
that the centers of the vibrators 4 are aligned without causing the eccentricity of the vibrators 3.
Or the piezoelectric vibrator 30 is not coupled to the support projection 2 so that the vibration of
the piezoelectric vibration support 3 is suppressed, and a sufficient sound pressure can not be
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obtained, or even characteristically There was a drawback that something satisfactory was not
obtained. The present invention eliminates the above-mentioned conventional drawbacks.
Hereinafter, an embodiment of the present invention will be described with reference to FIG.
Reference numeral 6 denotes a frame formed of a synthetic resin or the like, and a support
projection 7 having a sharp upper end is provided on the inner surface of the frame 6 and
protrudes inward on the bottom side between the inner circumferences of the rising from the
bottom. Pressure 'iL +: The vibrator holding vibrator portion 8 is provided. The piezoelectric
vibrator holding portion 8 may be provided all around the circumference, or may be partially
provided at several places. Th is mounted on the support projection T of such a frame 6 as a disc
− ′ 11 i, a four-shape Ff electric motor 9 and is coupled using an adhesive or the like having
viscoelasticity, An edge paint 10 is applied to a minute gap between the peripheral portion of the
piezoelectric vibrator 90 and the piezoelectric element holding portion 8.
That is, the piezoelectric vibrator 9 is incorporated by being guided by the piezoelectric vibrator
holding portion 8 and centered on the frame 6. The top of the conical diaphragm 11 is bonded to
the center of the upper surface of the piezoelectric vibrator 9 by an adhesive. The peripheral
portion of the diaphragm 110 is adhesively bonded to the peripheral portion of the frame.
According to this configuration, first, the piezoelectric vibrator 9 is incorporated into the frame 6
as the piezoelectric vibrator holding portion 8 as a kite, and is coupled to the support projections
7L, I1g'11. Apply the edge paint 10 to the periphery of the vibrator 90 1. Subsequently, the
diaphragm 11 is incorporated to be coupled to the piezoelectric vibrator 9 and to be flano. 6 can
be assembled in combination. Therefore, the piezoelectric vibrator sit frame 6) can be
incorporated without deviation from the center, and the supporting point 11i, J5 by the support
projection piece 7 is also on the nodal circle by the primary resonance frequency of the
piezoelectric vibrator 9 It is also possible to suppress the faithful vibration to the piezoelectric
vibrator 90 input signal and to not obtain sufficient sound pressure and characteristics, and the
piezoelectric vibrator 9 touches the frame 6 at the time of operation to generate an abnormal
sound. Also, it is easy to assemble, and productivity can be improved. As described above, the
piezoelectric speaker of the present invention has a characteristic surface. Along with the
improvement of quality, the improvement of productivity can be also improved, and the
advantage of cost can be obtained, and the practical value is increased.
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