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JPH01238296

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DESCRIPTION JPH01238296
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vibration noise-suppressing flat wave receiver having a large surface area using a thin film wave
receiving element made of polyvinylidene fluoride (hereinafter referred to as 'PVDFJ') which is a
polymeric piezoelectric material. is there. [Prior Art] A conventional wave receiver using a thin
film wave receiving element such as PVDF, which is a polymeric piezoelectric material, has a
structure shown in FIG. In the figure, 1 is a PVDF film '), and the PVDF film 1 is covered with a
molding material 3. なお、2はケーブルである。 The receiver of the above-described structure
has a receiver sensitivity of the volume piezoelectric constant glIX film thickness due to the
volume effect of the PVDF film 1. The PVDF film 1 can be easily manufactured to have a large
surface area as compared with a conventional receiver using a piezoelectric ceramic, has a high
volume piezoelectric constant, and is effective as a low frequency receiver. [Problems to be
Solved by the Invention] However, in the receiver with the above configuration, bending vibration
is easily generated even with a small driving force because the hardness of the entire receiver
including the molding material 3 is low on the large surface one. In the field of underwater
suspension, ship equipment, etc., for example, it produced the noise output with respect to the
bending vibration, and was not accepted practical use. The present invention has been made in
view of the above-mentioned point, and suppresses a bending noise output of a receiver using a
thin film receiving element, and is a low noise receiver which can withstand practical use in
underwater suspension, ship equipment, etc. Intended to provide. [Means for Solving the
Problems] The present invention for solving the above problems is a flat type wave receiver
having a thin film wave receiving element made of a PVDF film 1 as shown in FIG. The rigid plate
4 is attached. Further, the rigid plate 4 is provided with a plurality of slits 4 a. [Operation] By
attaching the rigid plate 4 to the back of the PVDF film 1 as described above, the rigidity of the
wave receiver can be improved, and the noise output due to the bending vibration can be
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reduced. It will withstand practical use in the field. Further, when the rigid plate 4 is provided
with the slits 4a, the flexural frequency of the rigid plate shifts to a high frequency region, so that
a receiver having a wider usable frequency bandwidth can be realized. Embodiments of the
present invention will be described below with reference to the drawings. FIG. 1 is a view
showing the structure of a vibration noise suppression type planar wave receiver according to
the present invention. In the figure, reference numeral 1 denotes a PVDF film, and a rigid plate 4
is adhered to the back surface of the PVDF film 1, and the PVDF film 1 and the rigid plate 4 are
covered with a molding material 3.
なお、2はケーブルである。 The rigid plate 4 is preferably as high in rigidity as possible, and a
thick metal material is preferable. However, depending on the operating frequency conditions,
the sound transmission is good. For example, reinforced fiber plastic (FRP), chloride chloride
(PVC), etc. It may be a resin material. In the case where a mode is generated in the rigid plate 4
to cause bending vibration and a resonance phenomenon is generated to disturb the flat
reception sensitivity frequency characteristic, as shown in FIG. 3, a thread t-4a of the rigid plate 4
should be provided. As a result, it is also possible to shift the vibration region of the receiver
itself to a high frequency region and remove this resonance phenomenon to realize a receiver
having a wider usable frequency bandwidth. In the wave receiver shown in FIG. 1 and FIG. 3, as
an adhesive agent for bonding the rigid plate 4 to the back surface of the PVDF film 1 in any
case, one of the same material as the molding material 3 (polyurethane in this embodiment) It is
good to use Further, in the configuration example shown in FIG. 1, a copper plate having a
thickness of 1 cTrl, a width of 157 mm, and a length of 373 ITII 'II is used as the rigid plate 4,
and the PVDF film 1 has a thickness of 110μ and the outside diameter of the molding material 3
is The width 150aX length 25Q111 mX thickness 16 m1ll. 4 (a) shows the wave receiving
sensitivity (relative value) frequency characteristics of the conventional (the structure shown in
FIG. 2), and FIG. 4 (b) shows the above embodiment (FIG. 1). (A relative value) frequency
characteristic of a receiver of a structure). In FIG. 4, the horizontal axis shows logarithmic scale
frequency, and the vertical axis shows receiving sensitivity (relative value). As shown in FIG. 7B,
in the case of the present embodiment, the wave receiving sensitivity (relative value) is stable to
around 1 kHz. On the other hand, in FIG. 6A, the reception sensitivity (relative value) is disturbed
even in the low frequency region (1 kHz or less). In the case of the conventional example, this is
estimated to be because the S / N ratio is reduced due to the bending noise output. As described
above, according to the present embodiment, by bonding the rigid plate 4 to the back surface of
the PVDF film 1, a receiver having extremely stable reception sensitivity (relative value) up to
around 1 kHz can be obtained. Although the PVDF film 1 is used as the thin film wave receiving
element in the above embodiment, it is natural that the thin film wave receiving element may be
made of other polymeric piezoelectric material or the like. As described above, according to the
present invention, the following excellent effects can be obtained. ■ By attaching a rigid plate to
the back of the thin film wave receiving element, the rigidity of the wave receiver can be
improved, and the noise output due to bending vibration can be reduced, so that it can be
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practically used in the field of underwater suspension, ship equipment etc. Become a receiver.
■ In addition, if the slit is provided rigidly, the bending frequency of the wave receiver itself
shifts to the high frequency region, so that the mode is generated rigidly and the resonance
phenomenon due to the bending vibration can be eliminated. It becomes a wave receiver.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a view showing the structure of a vibration noise suppression type flat wave receiver
according to the present invention, FIG. 2 is a view showing the structure of a conventional flat
wave receiver, and FIG. 3 is another vibration noise according to the present invention FIG. 4 (a)
shows the receiving sensitivity (relative value) frequency characteristics of the conventional
receiving device, and FIG. 4 (b) shows the receiving of this embodiment. It is a figure which
shows the receiving sensitivity (relative value) frequency characteristic of the device.
In the figure, 1 ... PVDF film, 2 ... cable, 3 ... molding material, 4 ... rigid plate.
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