close

Вход

Забыли?

вход по аккаунту

?

JPH02243098

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH02243098
[0001]
FIELD OF THE INVENTION The present invention relates to an ultrasonic ceramic microphone for
transmitting and receiving ultrasonic waves. 2. Prior Art Conventionally, this type of ultrasonic
ceramic microbon has a configuration as shown in FIG. In FIG. 2, the vibration case 1 has a
cylindrical side portion and a bottom of a truncated cone shape, and the piezoelectric ceramic
vibrator 2 is bonded on the inner bottom of the vibration case 1 to form a vibration portion, An
inner ring 3 is disposed on the inner side of the vibration case 1 as external pressure protection,
and a terminal plate 6 is inserted into the lower opening end of the vibration case 1 through a
buffer member 4 having a convex cross section. And the vibrating case 1 are sealed with an
elastic adhesive 5. The picture electrode portion of the piezoelectric ceramic vibrator 2 and the
terminal 8.9 are electrically connected by the lead wire 7. SUMMARY OF THE INVENTION
However, such a conventional configuration has a problem that the number of parts is large and
the assembling efficiency is not good. The present invention is intended to solve the abovementioned problems, and it is an object of the present invention to provide an ultrasonic ceramic
microphone having a reduced number of parts and improved assembly efficiency. Means for
Solving the Problems In order to solve the above problems, the present invention uses a
truncated cone-shaped vibration case, and bonds a piezoelectric ceramic vibrator on the inner
bottom surface of the vibration case to form a vibrating portion. The vibration case is supported
by a terminal plate having a cylindrical fixing portion in contact with the inclined surface of the
vibration case and a concave portion sealingly fixed by an elastic adhesive filling the outer
periphery of the vibration case. . According to the above configuration, by supporting the
vibration case with the cylindrical fixing portion provided on the terminal plate and the recess,
the assembly efficiency is improved, and the vibration case is disposed on the inner side of the
outer periphery of the terminal plate. The external support pressure is applied only to the
terminal plate and is not subjected to vibration suppression. Embodiments Hereinafter, one
04-05-2019
1
embodiment of the present invention will be described based on the drawings. FIG. 1 is a crosssectional view of an ultrasonic ceramic microphone according to an embodiment of the present
invention. As shown in FIG. 1, the vibration case 10 has a frusto-conical shape, and a
piezoelectric ceramic vibrator 16 is attached to the inner bottom surface of the vibration case 10
to form a vibration portion. The vibration case 10 has a shallow bottom shape including a bottom
portion and a slope portion to facilitate bonding of the piezoelectric ceramic vibrator 16. The
terminal plate 11 has a central portion at which a terminal 18.19 is implanted, and a cylindrical
fixing portion 12 having an annular tip around the terminals 18 and 19 and having a tip inclined
outward and downward is protruded. The cylindrical fixing portion 12 is The structure is in
contact with the inside of the slope of the truncated conical vibration case 10, and the tip slope
of the cylindrical fixing portion 12 is fixed to the inside of the vibration case 10 via the elastic
adhesive 20.
Furthermore, an annular recess 13 is provided on the outer peripheral side of the cylindrical
fixing portion 12 of the terminal plate 11, and the outer peripheral end of the vibration case 10
is sealed by the annular recess 13 via the elastic adhesive 15 filled in the annular recess 13. I
support it. A metal base 14 is attached to the lower surface of the terminal plate 11, and
terminals 18. 19 used for protection of the terminal plate 11 and for shielding are connected to
the piezoelectric ceramic vibrator 16 by lead wires 17. According to the above configuration, the
piezoelectric ceramic vibrator 16 bonded to the vibration case 10 and the terminal 18 ° 19
embedded in the terminal plate 11 are connected through the lead wire 17 to form the annular
recess 13 and the cylinder in the terminal plate 11 The ultrasonic ceramic microphone can be
easily assembled simply by filling and applying an elastic adhesive 15.20 to the tip end slope of
the rod-like fixing portion 12 and bonding the vibration case 10. Further, since the air resonance
cylinder is constituted by the bottom portion of the vibration case 10 and the cylindrical fixing
portion 12 to improve the vibration efficiency, and the vibration case 10 is elastically supported
on the terminal plate 11 at the outer peripheral end, The high-order resonance of the vibration
case 10 is absorbed, and stable vibration can be detected. Further, the terminal plate 11 is larger
than the outer diameter of the vibration case 10, and the support pressure is received by the
terminal plate 11. The end slope of the cylindrical fixing portion 12 of the terminal plate 11 may
not be applied with the elastic adhesive 20, but may only be brought into contact with the
vibration case 10. Further, the metal base 14 is attached to the terminal plate 11 before
assembly. It may be stored or may be attached after assembly. Effects of the Invention As
described above, according to the present invention, by forming the slope portion of the vibration
case in contact with the cylindrical fixing portion on the terminal plate, the air flow rR between
the bottom portion of the vibration case and the cylindrical fixing portion can be reduced.
Simplification was made, vibration efficiency was improved, and high sensitivity could be
realized. In addition, by elastically supporting the vibration case outer peripheral end on the
terminal plate, it has an effect of absorbing the high-order resonance of the vibration case, and
stable vibration can be detected. Since the terminal plate is configured to be larger than the
04-05-2019
2
vibration case outer diameter, the support pressure can be received by the terminal plate.
Furthermore, since the ultrasonic ceramic microphone is configured by the minimum number of
parts of the vibration case, the piezoelectric ceramic vibrator, and the terminal plate, an easily
assembled structure can be provided.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing an ultrasonic ceramic microphone according to an
embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a conventional
ultrasonic ceramic microphone.
DESCRIPTION OF SYMBOLS 10 ... Vibration case 11, 11 ... Terminal board, 12 ... Tubular fixed
part, 13 ... Annular recessed part, 14 ... Metal base, 15 ... Elastic adhesive agent, 16 ...
Piezoelectric Porcelain vibrator, 17 ... lead wire, 18.19 ... terminal. Agent Yoshihiro Morimoto
04-05-2019
3
Документ
Категория
Без категории
Просмотров
0
Размер файла
10 Кб
Теги
jph02243098
1/--страниц
Пожаловаться на содержимое документа