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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional side view of a
vibration detector in the prior art, and FIG. 2 is a change in output voltage relative to the
displacement of the piezoelectric ceramic plate and the amount of adhesive in the vibration
extractor. FIG. 3 is a partial sectional side view showing an embodiment of the vibration detector
according to the present invention, FIG. 4 is a perspective view of the vibration detector from
which the case is removed, FIG. These are figures which show the dispersion ¦ variation in the
output electric power in this invention and a conventional product. 1 · · · · · · · · · · · · · · · · · · · · · · · · ·
protrusion (recess). 1 "■ Kamikita Kami 2-34
DETAILED DESCRIPTION OF THE INVENTION It is an object of the present invention to provide a
vibration detector capable of detecting the vibration of an object with a high degree of variation
in output voltage. FIG. 1 shows a vibration detector of this type in the prior art, in which 1 is a
metal diaphragm, 2 (1 contact with 1 vibration: 1 Is a circular piezoelectric ceramic plate that is
fixed by bonding. 3 is a core wire of a lead wire and is soldered to the surface electrode of the
upper magnetic plate 20, while a 7-rut wire 4 of an IJ-wire is soldered to the diaphragm 1. Here,
the diaphragm 1 may be made of resin, and at this time, the 7-wires 4 are connected to the metal
foil bonded to the diaphragm 1. Then, the vibration detector 1 is completed by being fitted and
fixed to the diaphragm 1 as in the case 6. The vibration detector 11 using the piezoelectric
ceramic plate 2 is well known in general. When the diaphragm 1 is fixed in contact with the
object to be detected, the vibration of the object to be detected is vibrated to vibrate. In the
second embodiment, mechanical vibration is converted into an electrical signal by deflection
imaging by the vibration of the diaphragm 1, and this is led to an external circuit through a relay
line. The conventional vibration detector has a flat diaphragm 1F (··· IEjt porcelain plate 2 is used
as an adhesive for pressure bonding [7] as described above, but extra adhesive agent 6 back
vibration at the time of lE In most cases, flow from the space between the machine C'-1 and the
piezoelectric ceramic plate 2 to the diaphragm 1 +, remake 3, and the pressure change is not
uniform because the viscosity change of the adhesive is reduced at the time of adhesive bonding.
In the case, the piezoelectric ceramic plate 2 often causes positional deviation. When the
adhesive flows out onto the diaphragm 1, the vibration of the diaphragm 1 is suppressed due to
the hardness of the cough adhesive, and the output voltage is lowered, or the mechanical Q of the
diaphragm 1 is substantially reduced. descend. Also, as the piezoelectric ceramic plate 2 is
shifted from the center point of the ceramic plate 1, that is, as the piezoelectric ceramic plate 2
vibrates at a position shifted from the antinode of the vibration of the diaphragm 1, deflection of
the piezoelectric ceramic plate 2 In the case of the conventional vibration detector shown in FIG.
2, when the piezoelectric ceramic plate deviates from the middle point of the sliding plate and
when the adhesive Figure 1 is a diagram showing the position of the electromagnetic device
temporarily and the adhesion / deposition (a value when there is no amount of protrusion). As
can be seen from this figure, the output voltage decreases by more than 10 bits and decreases
rapidly if the protrusion amount and the positional deviation are both 2 m 2. There is no problem
in use if the output variation is within 10% or less, but the conventional vibration detector (1 ·?
4.-There were many variations in manufacturing at the time of mass production with regard to
the positional deviation and the protrusion amount, and this variation had a variation far
exceeding the allowable limit. The present invention has been conceived to eliminate the abovementioned deficiencies in the prior art, and in the following, one embodiment thereof will be
designated by the same reference numeral as in the prior art with FIG. 3 and FIG. I will pay tax.
As shown in the figure, in the present invention, the projection 7 is formed on the diaphragm 1,
and this projection is provided around the piezoelectric ceramic plate 2 so as to be substantially
point-symmetrical with respect to the center point of the diaphragm 1. And, the inside dimension
Y is determined so as to satisfy the relationship of X (Y ', X + 4 m) with respect to the length X of
the piezoelectric ceramic plate 2. In the vibration detector according to the present invention
provided with the projection 7 as described above, the adhesive 6 for 9 minutes does not
protrude beyond the projection 7 to the outside of the river electromagnetic plate 2 by more
than 2al1 and the clay porcelain plate 2 Also, there is no displacement of more than 2 u from the
center of the diaphragm 1 and it is possible to reduce it in FIG. A vibration detector with a high
degree of i can be obtained. 6) The scope of the present invention is not limited to the
embodiments shown in FIGS. 3 and 4. The effect of the piezoelectric ceramic plate is identical
even if it is rectangular or rectangular. In this case, the shape of the projection is If the
piezoelectric ceramic plate is rectangular and the protrusions are circular, it is sufficient to take
the diagonal length of the piezoelectric ceramic plate as X and the diameter of the inner surface
of the protrusions as Y. Furthermore, instead of the projections, four parts may be provided
inside the diaphragm. In this case, the excess adhesive is accumulated in the recess and does not
flow out of the recess. In addition, in the case where a recess is provided, the position of the
piezoelectric ceramic machine is prevented (1. A pressure is applied to the pressure-placed
porcelain plate when the stopper is fitted vertically into the recess. Absent. 4, the explanation in
the cabinet 1 Figure 1 is a partial view of the vibration detector in the prior art (1 in Figure 1 and
2 in Figure 1-1 I-E temporary position in the same vibration detector) And adhesive (the figure
which reduces the relationship with the change of the output power with respect to the
protrusion ('figure against the present invention), Figure 3 relates to the present invention)' '' '* l:
[O-sister example' 'f31 nt nll' '] Figure 11 Fig. 4 is a perspective view of a vibration detector from
which the case is removed, and Fig. 5 is a view showing variations in output power between the
product of the present invention and the conventional product. 1 ... shooting plate, 2 ...
piezoelectric @ 4 plate, 7 ... protrusion (recess). Name of agent Attorney Nakao Toshio i? (1
person-1 'figure 1 Figure 53 ;; 6t 264 figure 2 f volume range output electricity-ISS weight
pressure 1!
Variable (4) 3mm × 2mm (in the gravity plate) decal, power · 5, of the Et'ti rating 4 tile r ff (Inff
114 573 Z agent's name patent attorney Toshio Nakao 11 or 1 negative Figure 3 753 5 4 = 4 第
5 11 11 Power voltage ° 0 ((至) Cabinet No. 1 ′ ′ ゲ 3 full full A (D 1 理 敏 ほ か ほ か 1 6
6 Other agents Ninsho Osaka Prefecture Kadoma city Oda Kadoma address 100 in Matsushita
Electric Industrial Co., Ltd. 5 ... Name (6152) Patent attorney Shigeno Ogino 'Theta F' '' Gurin, Aoi