Epidark illumination system
US4186993A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1977 |
| Grant date | Feb 5, 1980 |
| Priority date | — |
| Expiry date | Sep 22, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B21/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An epidark illumination system for use with a microscope in which a sample is illuminated from around an objective by a ring-shaped light flux having its center coincident with the optic axis of the objective to enable the sample to be observed in a dark field of view comprises a ring-shaped condenser lens member disposed adjacent to the forward end of the objective with the center of the lens member being coincident with the optic axis of the objective to condense the light flux upon the sample, and a scattering member for scattering the ring-shaped light flux disposed in the light path before the ring-shaped light flux reaches the ring-shaped condenser lens member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.