JPH0332827U

JPH0332827U -

Info

Publication number: JPH0332827U
Application number: JP9162189U
Authority: JP
Priority date: 1989-08-03
Filing date: 1989-08-03
Publication date: 1991-03-29

Description

[Brief explanation of drawings]

第１図ａおよびｂは本考案の一実施例に係る圧
電フイルタの片面側及び他面側を同じ方向から見
たそれぞれの平面図、第２図は同圧電フイルタの
等価回路図、第３図は同圧電フイルタの外装の一
例を示す斜視図、第４図ａおよびｂは従来の圧電
フイルタの片面側および他面側を示すそれぞれの
平面図、第５図は同圧電フイルタの等価回路図、
第６図は同圧電フイルタの入出力インピーダンス
を説明するための等価回路図である。符号の説明、１……圧電フイルタ、２……圧電
基板、３……スリツト、４……略Ｕ字形電極、５
……音叉部、７……第１電極、８……第２電極、
９……第３電極、１０……第４電極、Ｃ_１……第
１コンデンサ、Ｃ_２……第２コンデンサ。 1A and 1B are plan views of one side and the other side of a piezoelectric filter according to an embodiment of the present invention viewed from the same direction, FIG. 2 is an equivalent circuit diagram of the same piezoelectric filter, and FIG. is a perspective view showing an example of the exterior of the piezoelectric filter, FIGS. 4a and 4b are plan views showing one side and the other side of a conventional piezoelectric filter, and FIG. 5 is an equivalent circuit diagram of the piezoelectric filter.
FIG. 6 is an equivalent circuit diagram for explaining the input/output impedance of the same piezoelectric filter. Explanation of symbols, 1...Piezoelectric filter, 2...Piezoelectric substrate, 3...Slit, 4...Substantially U-shaped electrode, 5
... Tuning fork part, 7 ... First electrode, 8 ... Second electrode,
9...Third electrode, 10...Fourth electrode, _C1 ...First capacitor, _C2 ...Second capacitor.

Claims

[Claims for Utility Model Registration] A piezoelectric device in which at least one slit for forming a tuning fork portion is formed in a piezoelectric substrate, and substantially U-shaped electrodes are formed on one side and the other side of the substrate along the slit. In the filter, the above approximately U is placed on one side of the substrate excluding the tuning fork part.
a first electrode formed integrally with the letter-shaped electrode; and a first electrode formed on one side of the substrate excluding the tuning fork portion.
a second electrode formed separately from the electrode; and a first capacitor formed on the other side of the substrate excluding the tuning fork portion and facing the first electrode, and forming a first capacitor, and The third electrode to be short-circuited, and the above-mentioned approximately U on the other side of the substrate excluding the above-mentioned tuning fork part.
A piezoelectric filter comprising: a fourth electrode formed integrally with the letter-shaped electrode and separately from the third electrode, and facing the second electrode and forming a second capacitor.