Erecting telescope
US4367010A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 11, 1980 |
| Grant date | Jan 4, 1983 |
| Priority date | — |
| Expiry date | Aug 11, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A terrestrial (erecting) telescope that may be inexpensively manufactured with plastic lenses but which telescope will provide a high quality image. The telescope comprises an objective lens, usually a single plano-convex lens, mounted in an outer tube. The telescope further comprises an inner tube in which are fixed an erecting lens system and an eye piece lens system. The erecting lens system comprises two identical plastic lens elements with opposite spherical and aspherical surfaces. The spherical surfaces of the erector lenses are facing. The eye piece lens system comprises a Ramsden eye piece having two plano-convex lenses with facing spherical surfaces. The aperture stop is positioned equidistance between the lenses of the erector lens system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.