Light-weight three-element clinical viewer

Details Light-weight three-element clinical viewer Light-weight three-element clinical viewer

1993-08-31

1995-10-31

Nguyen, Thong Q.

Optical: systems and elements

Lens

Afocal

359362, 359399, 359795, G02B 1300, G02B 2300

Patent

active

054635004

ABSTRACT:
A light-weight clinical viewer includes a two-element objective lens and a single-element eyepiece lens. Use of multiple lenses allows for a more compact package. The doublet objective serves to reduce vignetting while providing a wide field of view and reduced chromatic aberration. Image quality is further enhanced, while keeping the weight of the viewer down, through the use in the objective of light-weight high index glass. Moreover, the invention permits the use of a single mounting barrel assembly for different eyepieces to reduce manufacturing costs.

REFERENCES:
patent: 1197742 (1916-09-01), Kellner
patent: 1507111 (1924-09-01), Erfle
patent: 3273456 (1966-09-01), Feinbloom
patent: 3936152 (1976-02-01), Aurin et al.
patent: 4070098 (1978-01-01), Buchroeder
patent: 4278330 (1981-07-01), Buchroeder
patent: 5196028 (1993-03-01), Portney et al.

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