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US 10,094,727 B2Granted
Knocking sensor
AssigneeNgk Spark Plug Co., Ltd.
InventorKatsuki Aoi
Life of this patent
Estimating the term…
Abstract
Provided is a knocking sensor with a support member, a piezoelectric element, a pair of electrode parts, a resistor and a case. The resistor has a resistor body formed with a metal film and connected in parallel to the pair of electrode parts. The resistor also has an outer coating film applied to cover the metal film. The outer coating film is formed of a resin material having a higher thermal deformation temperature than that of a resin material of the case.
Claims6
A knocking sensor, comprising:
- a support member having a cylindrical body portion;
- an annular piezoelectric element disposed around an outer circumference of the body portion of the support member;
- a pair of electrode parts arranged around the outer circumference of the body portion of the support member and stacked on the piezoelectric element so as to output an electric signal from the piezoelectric element to an external device;
- a resistor having a resistor body formed with a metal film and connected in parallel to the electrode parts;
- and
- a case formed of a resin material and located outside the support member so as to surround at least the resistor, the piezoelectric element and the electrode parts,
- wherein the resistor has an outer coating film applied to cover the metal film;
- and
- wherein the outer coating film is formed of a resin material having a higher thermal deformation temperature than that of the resin material of the case.
6 more elements
Dependencies are inferred from the claim text.