Objective with large aperture ratio

Details Objective with large aperture ratio Objective with large aperture ratio

1993-02-22

1994-03-29

Arnold, Bruce Y.

Optical: systems and elements

Lens

Multiple component lenses

359756, G02B 962

Patent

active

052990656

ABSTRACT:
An objective lens comprising, respectively from the object: a first element of a positive lens, at the object end thereof, having a convex surface; a second element of a positive meniscus lens, at the object end thereof, having a convex surface; a third element of a negative lens, at the image end thereof, having a concave surface; a fourth element of a single lens or a cemented lens, at the object end thereof, having a convex surface, wherein the cemented lens includes two or three lenses; a fifth element of a negative lens, at the object end thereof, having a concave surface; and a sixth element of a positive lens, at the object end thereof, having a convex surface. The objective lens satisfies the following three conditional equations, assuming that "f" designates the focal distance of the entire lens system:

REFERENCES:
patent: 3454326 (1969-07-01), Schlegel
patent: 4076390 (1978-02-01), Fleischman

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