Collapsible terrestrial telescope

Details Collapsible terrestrial telescope Collapsible terrestrial telescope

1993-03-12

1995-08-22

Ben, Loha

Optical: systems and elements

Compound lens system

With relay

359362, 359399, 359434, G02B 2324, A61B 104

Patent

active

054445698

ABSTRACT:
A collapsible terrestrial telescope having a lens system which includes an objective lens and a terrestrial eyepiece, wherein the eyepiece includes an erecting lens group, and an eyepiece lens. The objective lens and the erecting lens group each include an aspheric surface. The objective lens may be one of an optically interchangeable doublet including a positive element having the aspheric surface and a negative element, or a singlet having the aspheric surface and a diffractive surface.

REFERENCES:
patent: 4367010 (1983-01-01), Broome
patent: 4784118 (1988-11-01), Fantone et al.
patent: 4938573 (1990-07-01), Saito
patent: 4993817 (1991-02-01), Hoogland
patent: 5054897 (1991-10-01), Ozawa
patent: 5184252 (1993-02-01), Miyauchi et al.

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