JPH0277640U

JPH0277640U -

Info

Publication number: JPH0277640U
Application number: JP15744788U
Authority: JP
Priority date: 1988-12-02
Filing date: 1988-12-02
Publication date: 1990-06-14

Description

[Brief explanation of drawings]

第１図ないし第４図は本考案の一実施例を示す
ものであつて、第１図は振動検出器の縦断面図、
第２図はその圧電素子の平面図、第３図はその振
動検出器に接続される振動検出回路の回路図、第
４図はこの振動検出回路の出力波形図である。第
５図は従来の振動検出器の縦断面図である。１はホルダケース、２は圧電素子、２ｂは圧電
セラミツク、３は上室、４は下室、５は質量体、
６はバネ、７，８は連通路、９は遮風ケースであ
る。 1 to 4 show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view of a vibration detector;
FIG. 2 is a plan view of the piezoelectric element, FIG. 3 is a circuit diagram of a vibration detection circuit connected to the vibration detector, and FIG. 4 is an output waveform diagram of this vibration detection circuit. FIG. 5 is a longitudinal sectional view of a conventional vibration detector. 1 is a holder case, 2 is a piezoelectric element, 2b is a piezoelectric ceramic, 3 is an upper chamber, 4 is a lower chamber, 5 is a mass body,
6 is a spring, 7 and 8 are communication paths, and 9 is a wind shielding case.

Claims

[Claims for Utility Model Registration] 1. A space formed within a holder case is divided into two chambers by a piezoelectric element supported within the holder case,
A vibration detector characterized in that a mass body is movably housed in a chamber on the piezoelectric ceramic side of the piezoelectric element, and the mass body is configured to be pressed against the piezoelectric ceramic by a spring. 2. According to claim 1, wherein communication passages are provided for communicating each of the chambers with the outside of the holder case, and a wind shielding case is provided on the outside of the holder case to prevent external airflow from directly flowing into both the communication passages. Vibration detector as described.