close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JPS53144359

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 JPS53144359
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of
the ultrasonic microphone according to the present invention, and FIG. 2 is a wave receiving
sensitivity according to the film thickness of the piezoelectric polymer film of the conventional
ultrasonic microphone FIG. 3 is a characteristic diagram showing the relationship between the
bands and FIG. 3 is a characteristic diagram showing the relationship between the wave receiving
sensitivity and the band depending on the film thickness of the ultrasonic microphone of the
present invention. 1 иииии Piezoelectric polymer film, 2 иииииииии Frame.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
microphone in which a piezoelectric polymer film is bonded to a curved frame, and the decrease
in sensitivity is almost M by selecting the thickness range of the piezoelectric polymer film. It is
an attempt to provide something that can be broadened (-? banding). Piezoelectric ceramic
ultrasonic microphones used in conventional remote control for television receivers have high Q
and narrow band characteristics, and therefore have poor transient characteristics, causing
inconvenience when transmitting more information. It was ??? ?
??????
?????????????? r92l-1f: The ultrasonic microphone of the structure bonded to
the curved frame 2 has a Q value equal to or less than that of the piezoelectric ceramic
microphone, for example, when the piezoelectric polymer film 1 with a thickness of 9 ?m is
used As shown by aVc in FIG. 2, it has an extremely flat receiving sensitivity characteristic, but
has a drawback that the sensitivity is low. In addition, when the piezoelectric polymer film 1
having a thickness of 30 ?m is used as a whole, although the reception sensitivity at resonance
is the same as shown in b of FIG. 2, the band can not be taken wide because Q is large. Moreover,
since the impedance becomes high with this film thickness, there is a disadvantage that the
induction is easy to spread. In order to increase the bandwidth of the ultrasonic microphone
using the piezoelectric polymer film 1 having a film thickness of 3 o ?m, for example, the back
of the piezoelectric polymer film 1 is filled with a sound absorbing material, or a thin fluid layer
14-04-2019
1
is provided. It is necessary to reduce the Q by providing an acoustic resistance, which inevitably
entails a decrease in delivery sensitivity. The film thickness of the piezoelectric polymer film 1 is
examined by taking into consideration the film thickness of the piezoelectric polymer film 1, and
the broadening of the band is to be made without lowering the delivery sensitivity. It is That is,
the present invention is characterized in that 12 ?m # 20 ?m is selected as the film thickness
of the piezoelectric polymer film 1 to be attached to the curved letter-like frame 2 as shown in
FIG. The wave receiving sensitivity characteristic of the ultrasonic microphone in which the film
thickness of the piezoelectric planarized film 1 is 16 ?m is shown in FIG. As is clear from FIG. 3,
there is no decrease in the receiving sensitivity, and wide band is a town refusal. Further, since
the piezoelectric polymer film 1 having a film thickness of 12 to 20 ?m can have a lower
impedance than that of a piezoelectric polymer film having a film thickness of 30 ?m, it is
possible to make the induction difficult to spread. . As described above, the ultrasonic
microphone according to the present invention can be broadened without causing a decrease in
the reception sensitivity, and moreover, the impedance can be lowered; It has great practical
value.
14-04-2019
2
Документ
Категория
Без категории
Просмотров
0
Размер файла
9 Кб
Теги
description, jps53144359
1/--страниц
Пожаловаться на содержимое документа