Retinoscope with external control sleeve
US5189449A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 11, 1991 |
| Grant date | Feb 23, 1993 |
| Priority date | — |
| Expiry date | Sep 11, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/1208
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A streak retinoscope has an external control sleeve that is fully rotatable and is movable axially for rotating the lamp and focusing the lens assembly, respectively. The lens assembly is carried on the lens holder and the lamp assembly is carried on a lamp carrier. The lamp carrier is rotatable but is held against axial motion, while the lens holder sleeve is held against rotation but is movable axially. A sliding gear arrangement is formed wherein the lamp carrier sleeve is configured with axially elongated teeth, thus serving as a sun gear. The outer control sleeve has internal teeth and serves as the ring gear. Planet gears can be carried on the lens carrier sleeve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.