The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 10, 1999
Filed:
Feb. 26, 1998
Hitachi, Ltd., Tokyo, JP;
Abstract
A cylinder pressure sensor is adapted to detect a cylinder pressure by detecting a change in the amount of light being transmitted through an optical fiber in an axial direction. Two support portions support the optical fiber at two points along the length thereof. A diaphragm in contact with the optical fiber causes bending of the optical fiber in dependence upon a change in the cylinder pressure. The position at which a force is applied against the optical fiber by the diaphragm is deviated from a center position between the two support portions. The resulting cylinder pressure sensor is capable of accurately measuring cylinder pressure and knocking over a long period of time with a low cost and reduced initial variations.