JPH0228127U

JPH0228127U -

Info

Publication number: JPH0228127U
Application number: JP10682988U
Authority: JP
Priority date: 1988-08-11
Filing date: 1988-08-11
Publication date: 1990-02-23

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例の概略斜視図、第２
図は従来例の平面図、第３図は圧電フイルタの回
路図、第４図は第１図実施例に用いられる圧電基
板の平面図、第５図は第１図実施例に用いられる
リード端子を説明するための斜視図である。図において、２１は圧電基板、２２はコンデン
サ素子、２３，２４はフイルタ素子、２５，２６
，２７，２８は振動電極、３０，３１は共通電極
、３３，３４は入出力引出し電極、３５，３６は
共通引出し電極、３８，３９，４０は引出し端子
、４１，４２，４３は弾性分岐部を示す。 Fig. 1 is a schematic perspective view of one embodiment of the present invention;
The figure is a plan view of a conventional example, Figure 3 is a circuit diagram of a piezoelectric filter, Figure 4 is a plane view of a piezoelectric substrate used in the embodiment shown in Figure 1, and Figure 5 is a lead terminal used in the embodiment shown in Figure 1. It is a perspective view for explaining. In the figure, 21 is a piezoelectric substrate, 22 is a capacitor element, 23 and 24 are filter elements, 25 and 26
, 27, 28 are vibration electrodes, 30, 31 are common electrodes, 33, 34 are input/output extraction electrodes, 35, 36 are common extraction electrodes, 38, 39, 40 are extraction terminals, 41, 42, 43 are elastic branch parts shows.

Claims

[Claims for Utility Model Registration] Two or more filter elements are connected in series,
A piezoelectric filter in which a capacitor is connected in parallel to a common potential between adjacent filter elements, the piezoelectric filter having a piezoelectric substrate polarized in the thickness direction and formed at a predetermined distance on one principal surface of the piezoelectric substrate. two or more filter elements each having a pair of vibrating electrodes, and a common electrode formed on the other main surface side so as to face the vibrating electrodes through the piezoelectric substrate; and one main surface of the piezoelectric substrate. an input/output extraction electrode electrically connected to the vibration electrode of the input/output stage on the top; a common extraction electrode formed on the other main surface of the piezoelectric substrate so as to be electrically connected to the common electrode; placed on one main surface of the piezoelectric substrate,
A capacitor element separate from the piezoelectric substrate with one electrode connected between adjacent filter elements, the other electrode of the capacitor element, and a common lead electrode on the other main surface of the piezoelectric substrate electrically connected to each other. a common lead-out terminal having an elastic branch portion sandwiching the capacitor element and the piezoelectric substrate so as to connect the same; and an input/output lead-out terminal connected to the lead-out electrodes connected to the vibrating electrodes on the input and output sides of the filter element. A piezoelectric filter comprising a terminal.