Eyepiece

Details Eyepiece Eyepiece

1996-01-17

2000-01-04

Epps, Georgia Y.

Optical: systems and elements

Lens

Eyepiece

359643, 359673, 359714, 359715, G02B 2500

Patent

active

060116552

ABSTRACT:
An eyepiece including a positive first lens element, a negative second lens element, a positive third lens element and a positive fourth lens element is provided. The first, second, third, and fourth lens elements are spaced from one another and arranged in this order from an object side. At least one of the four lens elements is a plastic lens with at least one aspherical surface satisfying the relationships defined by;

REFERENCES:
patent: 4240701 (1980-12-01), Lytle
patent: 5151823 (1992-09-01), Chen
patent: 5162945 (1992-11-01), Matsuo et al.
patent: 5300977 (1994-04-01), Lewis et al.
patent: 5305147 (1994-04-01), Hasegawa et al.

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