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:
Apr. 03, 1990
Filed:
Jul. 25, 1988
Man Design Co., Ltd., Tokyo, JP;
Abstract
When a probe of a displacement measuring apparatus is moved, a core member connected to the probe is also moved through coils of an oscillator. A movement distance of the probe is calculated in accordance with a change in an oscillation frequency generated in correpondence with the movement of the core member. If strict displacement measuring is to be performed, the non-linear relationship between the moving distance of the core member and the change in the oscillation frequency must be taken into account, i.e., the relationship therebetween is measured in linear manner, the movement distance is calculated and then secondary curvature correction is performed to correct for the linear measurement. Therefore, measurement precision of the displacement measuring apparatus can be greatly improved as compared to that of a conventional displacement measuring apparatus.