Erecting telescope

Details Erecting telescope Erecting telescope

1980-08-11

1983-01-04

Corbin, John K.

G02B 2300

Patent

active

043670105

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.

REFERENCES:
patent: 3153690 (1964-10-01), Kuyt et al.
patent: 3583785 (1971-06-01), Boardman
patent: 3722979 (1973-03-01), Mikami
patent: 4240701 (1980-12-01), Lytle

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