Objective lens system for endoscopes having an image transfer op

Details Objective lens system for endoscopes having an image transfer op Objective lens system for endoscopes having an image transfer op

1996-09-05

1998-07-07

Leubecker, John P.

Optical: systems and elements

Lens

Microscope objective

359663, 359783, 600176, G02B 2102, A61B 106

Patent

active

057777977

ABSTRACT:
An objective lens system for an endoscope having an image transfer optical fiber bundle comprises from the object end a first lens of negative power having a concave image side surface, a second lens of positive power having a radius of curvature greater on an image side than on an object side, a third lens of positive power having a radius of curvature greater on the object side than on the image side, a doublet lens of positive power which comprises a forth lens element and a fifth lens element, and an aperture diaphragm interposed between the second and third lenses and satisfies the following relations:

REFERENCES:
patent: 4269485 (1981-05-01), Yamashita et al.
patent: 5424877 (1995-06-01), Tsuyuki et al.

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