Illuminating device in an ophthalmometer
US3932030A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 1974 |
| Grant date | Jan 13, 1976 |
| Priority date | — |
| Expiry date | May 16, 1994 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/10
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In an ophthalmometer comprising a chart plate, an illuminating device for illuminating the chart plate, a viewing optical system having an optical measurement adjust member for viewing therethrough the chart image projected by the illuminating device upon the cornea of an eye to be examined, a scale read-out device movable with the optical member and having a cornea curvature radius scale plate, and an astigmatism axis angle scale plate, the illuminating device comprises a chart illuminating light source member disposed behind the chart and within the viewing optical system and being in an annular form corresponding to the configuration of the chart of the chart plate. The illuminating device further includes a reflector member having light-transmitting portions for directing therethrough light beams for illuminating the two scale plates, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.