Circularity measuring apparatus
US8020309B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 2010 |
| Grant date | Sep 20, 2011 |
| Priority date | — |
| Expiry date | Jun 10, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/282
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A circularity measuring apparatus includes: a rotary table on which a measured object is loaded; a contact-type stylus configured to contact a substantially circular measured surface of the measured object with an inclination; a holder configured to hold the stylus within a predetermined stroke range so that an inclination angle of the stylus is changeable; a displacement detector configured to detect a displacement of the inclination angle of the stylus, which is caused due to a contact between the stylus and the measured surface; and a controller configured to: estimate a position of a top end of the stylus based on an output of the displacement detector; and instruct the holder in an optimal stroke range in the position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.