Piezoelectric sensor

Details Piezoelectric sensor Piezoelectric sensor

1992-04-09

1998-04-14

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310338, H01L 4108

Patent

active

057396264

ABSTRACT:
An improved piezoelectric sensor for detecting pressure, vibration, acceleration or the like physical quantity is disclosed. The pressure sensor to be attached to a cylinder block of an internal combustion engine includes a main body adapted to be attached to the cylinder and defining an axially extending hole therewithin, a diaphragm attached to one end of the main body for closing the hole; and a piezoelectric element disposed within the hole so that the pressure within the cylinder is transmitted to the piezoelectric element through the diaphragm. The piezoelectric element is a circular or polygonal disc with a thickness of 0.3-1.5 mm and is formed of a single crystal piezoelectric ceramic having a Curie temperature greater than 500.degree. C., such as LiNbO.sub.3.

REFERENCES:
patent: 3591813 (1971-07-01), Coquin et al.
patent: 3714476 (1973-01-01), Epstein
patent: 3727084 (1973-04-01), Epstein
patent: 3735161 (1973-05-01), Perkins et al.
patent: 3756070 (1973-09-01), McElroy
patent: 3858065 (1974-12-01), Epstein
patent: 4519254 (1985-05-01), Sonderegger et al.
patent: 4712036 (1987-12-01), Gurich
patent: 4893049 (1990-01-01), Bundy et al.
patent: 5126617 (1992-06-01), Lukasiewicz et al.

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