JPS61189622U

JPS61189622U -

Info

Publication number: JPS61189622U
Application number: JP7401285U
Authority: JP
Priority date: 1985-05-17
Filing date: 1985-05-17
Publication date: 1986-11-26

Description

[Brief explanation of the drawing]

第１図ないし第４図は本考案の実施例を示し、
第１図はこの実施例の斜視図、第２図は第１図に
おける切欠線―に沿う断面図、第３図は第１
図における切断線―線に沿う断面図、第４図
はこの実施例と従来例の圧電共振子の対称モード
の特性を示す線図、第５図は他の実施例の斜視図
、第６図はこの種の圧電共振子の従来例の斜視図
、第７図は一般的なデイフアレンシヤルピーク型
ＦＭ検波回路のブロツク図、第８図は従来例の等
価回路図である。１……圧電基板、１ａ……圧電基板部分、２，
３……分割電極、４……共通電極、８……第１引
出電極、９……第２引出電極、１０……第３引出
電極、１１……切欠溝、１２……透孔。 1 to 4 show embodiments of the present invention,
Figure 1 is a perspective view of this embodiment, Figure 2 is a sectional view taken along the notch line in Figure 1, and Figure 3 is a cross-sectional view of the first embodiment.
4 is a diagram showing the symmetrical mode characteristics of the piezoelectric resonators of this embodiment and the conventional example, FIG. 5 is a perspective view of another embodiment, and FIG. 7 is a perspective view of a conventional example of this type of piezoelectric resonator, FIG. 7 is a block diagram of a general differential peak type FM detection circuit, and FIG. 8 is an equivalent circuit diagram of the conventional example. 1...Piezoelectric substrate, 1a...Piezoelectric substrate part, 2,
3...Divided electrode, 4...Common electrode, 8...First extraction electrode, 9...Second extraction electrode, 10...Third extraction electrode, 11...Notch groove, 12...Through hole.

Claims

[Scope of utility model registration request]

A rectangular flat piezoelectric substrate is provided, a pair of divided electrodes facing each other is formed on one main surface of the piezoelectric substrate, and first and second extraction electrodes led out from both the divided electrodes are connected to the one main surface of the piezoelectric substrate. A common electrode is formed on the other main surface of the piezoelectric substrate to face the two divided electrodes in the thickness direction of the piezoelectric substrate. In a three-terminal piezoelectric resonator for an FM discriminator, the piezoelectric resonator for a three-terminal FM discriminator is arranged between the first and second extraction electrodes on the main surface of the 1. A piezoelectric resonator for an FM discriminator, characterized in that a cutout groove or a through hole of a predetermined length is formed in a piezoelectric substrate portion between an electrode and a third extraction electrode.