Reflection type optical focusing apparatus
US4458302A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1982 |
| Grant date | Jul 3, 1984 |
| Priority date | — |
| Expiry date | Jun 2, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B19/0095
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A reflection-type optical focusing apparatus comprising an optical focusing system including at least two 4th-degree surface reflectors with their revolving symmetric axis formed by a line connecting the position of a point source and the point source focusing position, said reflectors being used in combination so that the light emitted from a point source placed at the point source position is focused to form a virtual point source at the point source focusing position, and a 4th-degree surface reflector with its cross-section, on a plane including the revolving symmetric axis, forming a part of an ellipse with its major axis having a certain inclination with respect to the revolving symmetric axis, said virtual point source being located at one focal point of the ellipse so that a light image in the shape of an arc band is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.