Color corrected ocular

Details Color corrected ocular Color corrected ocular

1994-06-28

1996-01-30

Sugarman, Scott J.

Optical: systems and elements

Lens

Eyepiece

359717, 359794, G02B 2500, G02B 1318, G02B 906

Patent

active

054885124

ABSTRACT:
The invention is directed to a color corrected ocular having a very simple configuration and excellent correction characteristics. The ocular includes a single lens at the eye end with the single lens having an aspherical surface r.sub.2 and a two-element composite lens (2, 3). The surface r.sub.3 of the composite lens adjacent to the aspherical surface r.sub.2 is a planar surface. In another embodiment, the composite lens includes a planar-convex lens 2 and a planar-concave lens 3 which are cemented to each other at respective convex and concave surfaces. The spacing d.sub.1 between the single lens 1 and the exit pupil 4 is sufficiently large so that the ocular is also suitable for a wearer of spectacles.

REFERENCES:
patent: 2528468 (1950-10-01), Cojan
patent: 3472577 (1969-10-01), Rosin et al.
patent: 4730905 (1988-03-01), Takada
patent: 5162945 (1992-11-01), Matsuo et al.

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