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JPS61285899

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DESCRIPTION JPS61285899
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
AE sensor that mounts a piezoelectric element and detects an acoustic emission (hereinafter
referred to as AE) signal and a piezoelectric vibrator used as an ultrasonic oscillator. SUMMARY
OF THE INVENTION A piezoelectric vibrator according to the present invention is provided with
an insulator film having a mounting hole for mounting a piezoelectric element and a connection
hole for connecting a lead to an electrode film formed on a diaphragm. The attachment position
of the piezoelectric element and the connection position of the lead wire are limited, and the
amount of the used solder or conductive adhesive is limited. By doing this, it becomes possible to
perform uniform attachment processing of the piezoelectric element and the lead wire regardless
of the level of skill of the worker. [Prior Art and its Problems] Conventionally, the diaphragm for
a piezoelectric vibrator has a structure in which an electrode film 2 is formed on the entire upper
surface of a diaphragm 1 made of alumina ceramic or the like as shown in FIG. Then, the
conductive adhesive 3 is applied directly to an appropriate position on the upper surface of the
electrode film 2, and the piezoelectric element 6 having the electrode films 4 and 5 is fixed on
both surfaces thereof. The conductive adhesive was glued or soldered at a suitable position on
the top surface of the. However, in the process of attaching the piezoelectric element 6 to the
electrode film 2 or connecting the lead wire 7, the attachment position, the connection position,
and the amount of use of the solder and conductive adhesive used for attachment and connection
Since it is left to the choice of the person, so-called variations easily occur in the attachment state
of the piezoelectric element 6 and the connection state of the lead wire 7. Therefore, there is a
problem that the characteristics of the transducer system are not uniform due to the difference in
the attachment state as described above, and the acoustic characteristics are often different for
each element. Therefore, in order to make the characteristics of the vibrator system constant, the
operator specifies the attachment position of the piezoelectric element 6 and the connection
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position of the lead wire 7 for each piezoelectric vibrator, and further uses solder or conductive
adhesive to be used Although it is necessary to keep the amount constant, this is a very timeconsuming operation and there is a problem that the efficiency of the assembly operation is
reduced. SUMMARY OF THE INVENTION The present invention solves the problems of such
conventional piezoelectric vibrators, in which the position of attachment of the piezoelectric
element and the position of connecting the lead wire to the electrode film are limited. It is an
object of the present invention to provide a piezoelectric vibrator that can be manufactured while
keeping the amount of solder used constant. [Configuration and Effect of the Invention] The
present invention is a piezoelectric vibrator having a piezoelectric element and a diaphragm
having an electrode film on the upper surface and to which the piezoelectric element is attached,
the through-hole for attaching the piezoelectric element on the electrode film And an insulator
film provided with through holes for connecting lead wires, and piezoelectric elements and lead
wires are attached to the respective through holes of the insulator film.
According to the present invention having such features, since the mounting hole and lead wire
connecting hole of the piezoelectric element are formed on the surface of the electrode film, the
mounting position of the piezoelectric element and the position where the lead wire is connected
in advance The amount of conductive adhesive and solder to be used is limited. Therefore, the
operator does not have to select the attachment position of the piezoelectric element and the
connection position of the lead wire, and the amount of use of the conductive adhesive and the
solder can be easily adjusted to a predetermined amount. Therefore, the piezoelectric vibrator
incorporated in such a vibrating plate has uniform vibrator system characteristics, and acoustic
characteristics can be stabilized. In addition, the work of attaching the piezoelectric element and
the work of connecting the lead wires can be facilitated, and the efficiency of the assembling
work can be improved. 1 (al, (bl is a plan view showing an example of a diaphragm used for a
piezoelectric vibrator according to an embodiment of the present invention and its longitudinal
sectional view, and FIG. 2 shows a piezoelectric element attached thereto) It is a longitudinal
cross-sectional view which shows an example of the closed state. In these figures, the same parts
as those of the conventional example use the same reference numerals. Also in the present
embodiment, the electrode film 2 is formed on the upper surface of the diaphragm 1 made of
alumina ceramic or the like by a method such as printing and baking. Then, on the upper surface
of the electrode film 2, an insulator film 12 having a mounting hole 10 for mounting the
piezoelectric element 6 in the center and a connection hole 11 of the lead 7 at one side edge is
formed. The insulator film 12 can be easily formed by forming a general glass-based paste for
thick film circuit printing by a conventional screen printing method. The attachment hole 10 of
the piezoelectric element 6 provided in the insulator film 12 is formed to a size that allows the
piezoelectric element 6 to be inserted, and the lead wire connection hole 11 has a sufficient
amount of solder 13 or conductivity to connect the lead wire 7 The adhesive 3 should be sized to
be usable. According to the diaphragm 1 configured as described above, the operator can easily
and quickly attach the piezoelectric element 6 and the lead wire 7 to the predetermined position.
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In addition, the amount of the conductive adhesive 3 and the solder to be used is regulated by
the capacity of the attachment hole 10 of the piezoelectric element 6 and the connection hole 11
of the lead wire, so that the amount can be easily kept constant.
[0002]
Brief description of the drawings
[0003]
1 (a) is a plan view of a diaphragm showing an embodiment of the present invention, FIG. 1 (b) is
a longitudinal sectional view thereof, and FIG. 2 is an example of a state where a piezoelectric
element is attached to this diaphragm. FIG. 3 is a longitudinal sectional view showing an example
of a conventional piezoelectric vibrator.
1-----Diaphragm 2-----Constant electrode film 6---Piezoelectric element 7----Lead wire i o------ ----Lead wire connection hole 12-----One insulator film patent applicant Tateishi Electric Co., Ltd.
Attorney patent attorney Yoshiki Okamoto (one other person) Fig. 1 (a) 1 Q Fig. 1 (B) 1----One
rocking slope 6---4-Ladder 1 o----1 gage + Mounting hole 11--------No. 1-node woven ttU 匙 12----A single four day break Figure 2 Figure 3
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