Eyepiece system

Details Eyepiece system Eyepiece system

1990-06-25

1991-10-22

Arnold, Bruce Y.

Optical: systems and elements

Lens

Eyepiece

G02B 918

Patent

active

050590049

ABSTRACT:
An eyepiece system which can be used in the eyepiece portion of an endoscope. The eyepiece system comprises, in order from an eye point, a first positive lens having two convex surfaces, a second negative lens having a concave surface facing to the eye point side, and a third positive lens having a convex surface facing to the eye point side. Due to such construction, the eyepiece system can be compact and light in weight, and it also can provide a high magnification. Further, the eyepiece system has a sufficient eye point distance. Accordingly, the eyepiece system is an ideal eyepiece system for an endoscope.

REFERENCES:
patent: 1159233 (1915-11-01), Konig
patent: 4425025 (1984-01-01), Sunaga
patent: 4572623 (1986-02-01), Tanaka et al.
patent: 4673262 (1987-06-01), Tsuji

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