Optical system for telescope

Details Optical system for telescope Optical system for telescope

2008-05-06

2008-05-06

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Eyepiece

C359S771000, C359S773000

Reexamination Certificate

active

07369319

ABSTRACT:
An optical system (1) of telescope includes an objective lens (10) for collecting incident light and transmitting the incident light along a light path, and an imaging lens group (20) disposed on the light path that makes the optical system focus on an image plane (40). The imaging lens group includes two positive lenses and two negative lenses. Each lens of the imaging lens group has a refractive index less than 1.80.

REFERENCES:
patent: 4286844 (1981-09-01), Nagler
patent: 4389097 (1983-06-01), Ohishi
patent: 5162945 (1992-11-01), Matsuo et al.
patent: 6424468 (2002-07-01), Mouri et al.
patent: 54011754 (1979-01-01), None

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