JPH0255733U

JPH0255733U -

Info

Publication number: JPH0255733U
Application number: JP13588988U
Authority: JP
Priority date: 1988-10-17
Filing date: 1988-10-17
Publication date: 1990-04-23

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す縦断側面図、
第２図イ〜ニは狭幅部１２の実施例を示す脚部の
一部の平面図、第３図は脚部３ｂ，４ｂの折曲を
示す縦断側面図、第４図はプリント配線基板Ｐへ
の実装状態を示す斜視図、第５図はラダー型圧電
フイルタの等価回路図であつて、Ａは逆Ｌ接続型
、Ｂは多段接続型を示す。また第６図は従来構成
の欠点を示す一部の縦断側面図である。１……直列枝圧電共振子、２……並列枝圧電共
振子、３……入力端子板、３ｂ……脚部、４……
出力端子板、４ｂ……脚部、８……金属製ケース
、８ａ……開口面、８ｂ……接地脚部、９……絶
縁樹脂層、１２……狭幅部。 FIG. 1 is a vertical side view showing an embodiment of the present invention;
2A to 2D are plan views of a part of the legs showing an embodiment of the narrow width portion 12, FIG. 3 is a vertical cross-sectional side view showing the bending of the legs 3b and 4b, and FIG. 4 is a printed wiring board. FIG. 5 is an equivalent circuit diagram of a ladder type piezoelectric filter, in which A shows an inverted L connection type and B shows a multistage connection type. Moreover, FIG. 6 is a partial vertical side view showing the drawbacks of the conventional structure. 1... Series branch piezoelectric resonator, 2... Parallel branch piezoelectric resonator, 3... Input terminal board, 3b... Leg, 4...
Output terminal board, 4b...leg, 8...metal case, 8a...opening surface, 8b...ground leg, 9...insulating resin layer, 12...narrow width part.

Claims

[Scope of utility model registration request]

a plurality of piezoelectric resonators; a plurality of terminal plates that contact and electrically and mechanically clamp the vibration nodes of the resonators;
An insulating plate inserted at appropriate locations to configure a predetermined filter circuit, a case that accommodates these components in tandem and leads the legs of each terminal board to the outside from an opening surface, and an opening surface of the case. The legs of each terminal board are bent into a crank shape and the filter body is mounted on a printed circuit board using a surface mount type. 1. A ladder-type piezoelectric filter characterized in that a narrow width part is formed at an inner end side bending position of the part, and the filter is bent at the narrow width part.