Patent · US Expired

Color corrected ocular

US5488512A · kind A · utility

3Cited by

4References

9Claims

0Family size

Assignee

Carl Zeiss Stiftung · DE

Inventor

Franz Muchel · Oberkochen, DE

Key dates

Filing date	Jun 28, 1994
Grant date	Jan 30, 1996
Priority date	—
Expiry date	Jun 28, 2014

Classification

Technology area (CPC G)Physics
CPC primaryG02B25/00
WIPO fieldOptics
WIPO sectorInstruments

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.