Measurement of articles
US4323850A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1979 |
| Grant date | Apr 6, 1982 |
| Priority date | — |
| Expiry date | Nov 15, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In order to measure, for example, the radius of curvature of a soft contact lens, the lens is mounted in a bath of the electrolyte and supported at its periphery on a tubular support. A probe movable along an axis has two electrodes mounted on it and the resistance or impedance between those electrodes and the mount is monitored; when the difference in these resistances or impedances equals a predetermined value, the probe is taken as being a predetermined distance from the lens and the position of the probe relative to the mount is measured by a transducer arrangement. The output from the transducer is converted to digital form and used to address a read-only-memory in which are stored values correlating the position of the probe along the axis with the radius of curvature of the lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.