Apparatus for positioning a contact lens under a radiuscope
US4496242A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1981 |
| Grant date | Jan 29, 1985 |
| Priority date | — |
| Expiry date | Dec 22, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/0221
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for positioning the curved surface of a lens beneath a radiuscope provides a variable distance between the lens surface and a pivot point for the lens to thereby accommodate lenses having different curvature radii. The device includes a pair of X- and Y-axis slides for providing adjustment of the lens in a horizontal plane. A first Z-axis slide connected to the X- and Y-axis slides enables the height of the lens relative to the radiuscope to be varied. A second Z-axis slide is pivotably attached to the first Z-axis slide. The lens to be examined is accommodated in a lens holder that is attached to the second Z-axis slide. Movement of the second slide along its translational axis varies the distance between the lens and the pivot point for the slide. Once this distance is set to a value equal to the radius of curvature of the lens being examined, the second slide can be rotated about its pivot point to enable the entire surface of the lens to be examined under the radiuscope without the need to refocus the scope upon repositioning of the lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.