Opthalmic lens inspection system
US5818573A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1997 |
| Grant date | Oct 6, 1998 |
| Priority date | — |
| Expiry date | Feb 6, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/0221
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ophthalmic lens inspection system includes an illumination assembly which generates diffuse light and transmits the diffuse light through an ophthalmic lens disposed in an inspection position, the diffuse light having a diffusivity of between 30.degree. and 50.degree.. An imaging assembly generates a set of signals representing selected portions of the diffuse light transmitted through the ophthalmic lens in the inspection position. A moving mechanism supports the imaging and illumination assemblies for common movement relative to the contact lens, to bring a reference point into alignment with the center of the imaging assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.