close

Вход

Забыли?

вход по аккаунту

?

JPS5288326

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 JPS5288326
Description 1, title of the invention
??????
3. Detailed Description of the Invention The present invention relates to a microphone using a
vibrating membrane in which electrodes are provided on both sides of a piezoelectric polymer
film. First, a conventional microphone of this type will be described with reference to FIG. In FIG.
1, reference numeral 1 denotes a substrate having a U-shaped cross section, and a vibrating film
2 is attached to the side surface of the substrate 1. The vibrating film 2 has electrodes provided
on both sides of a piezoelectric polymer film. Reference numeral 3 denotes an elastic substance
interposed between the substrate 1 and the vibrating membrane 2. The elastic substance 3 is
provided with tension and elasticity. In the microphone of the above structure, when the
vibrating membrane 2 vibrates, a signal is obtained between the electrodes provided on both
sides of the vibrating membrane 20. EndPage: 131 However, the above-mentioned conventional
microphone has a drawback that the frequency band and the sensitivity can not be designed
freely. That is, to widen the frequency band of the microphone, the sensitivity decreases if the
diaphragm 2 is tightened strongly, and if the diaphragm 2 is weakly stretched to increase the
sensitivity as described above, the frequency band is narrow and the frequency band is wide And
there is a drawback that a microphone with high sensitivity can not be obtained. The present
invention eliminates the above-mentioned conventional drawbacks and provides a microphone
having a wide frequency band and high sensitivity, and an embodiment of the present invention
will be described below. In FIG. 2 and FIG. 3, 4 is a substrate having a U-shaped cross section, 6 is
a vibrating membrane attached to the side surface of the substrate 4 and 6 is an elastic material
interposed between the vibrating membrane 6 and the substrate 4 It is. A plurality of electrodes
7.7 'are respectively provided on the upper and lower surfaces of the vibrating membrane 6 in
04-05-2019
1
the present embodiment. .. Are formed, and an electrode provided on the upper surface of the
vibrating membrane 6, for example, the electrode 7 / is provided next to the lower surface of the
vibrating membrane 6. The two matching electrodes 8.8 'are provided in such a way as to be able
to strike the opposing Japanese Patent Application 52-88326 (2). The microphone elements
n1yn2 @ n3Hn41n5 are respectively formed between the electrodes facing each other across the
diaphragm 5, and these several microphone elements n,..., N5 are electrically connected in series.
For this reason, the voltage generated at each microphone element works with the added output.
It is known that the following relationship is established between the angular frequency of
resonance .omega.h which is the target of the physical properties. Here, K is a constant that is
proportional to the piezoelectricity of the polymer film, and this value does not change with the
size of the microphone. Therefore, in the above embodiment, the sensitivities of the microphone
elements alone are equal to the sensitivities of the prior art shown in FIG. 1 having the same size
as the microphone constituted by them and the high resonance frequency.
Therefore, in the case where the high frequency xi frequency characteristics are designed to be
equal, in the microphone of the present invention, its 5 "-di sensitivity can be designed to be
several times higher than the microphone element. Also, if the sensitivities are designed to be
equal, as is clear from the equation (1), the high sensitivity frequency characteristic is improved.
FIGS. 4 and 6 show other embodiments of the present invention, and in FIGS. 4 and 5, 9, 9 ', 9 "...
Microphone elements n,..., N6 are constituted by the vibrating films 9, 9 ', 9 ",... The adjacent
microphone elements n to n 6 are supported by the supporting body, and the adjacent
microphones! Each of n and n5 is held so that the back surface electrode and the surface
electrode of another microphone element are in contact with each other, and a plurality of
microphone elements n1 to n6 are electrically connected in series. As apparent from the above
embodiments, according to the present invention, a microphone having a wide frequency band
and high sensitivity can be obtained.
4. Brief description of the drawings. FIG. 1 is a perspective view of a conventional microphone,
and FIG. 6 is a perspective view of a microphone according to an embodiment of the present
invention, FIG. 3 is a sectional view taken along the line A-B of FIG. 2, FIG. 4 is a perspective view
of another embodiment of the present invention, and FIG. It is 8-B sectional drawing of FIG. 4a иии
Substrate, 6 иии Vibrating film, 6 fist ииии elastic material, 7, 7 ?, 7 ? ?, 8.8 ?, 8 ? ?,... ?...
Vibrating membrane, n 1 to n 5... Microphone elements, 10. Name of agent Attorney Nakao
Toshio et al. 1 person EndPage: 2 Fig. 1 / -129EndPage: ?
04-05-2019
2
Документ
Категория
Без категории
Просмотров
0
Размер файла
9 Кб
Теги
jps5288326
1/--страниц
Пожаловаться на содержимое документа