Object lens and endoscope using it

Details Object lens and endoscope using it Object lens and endoscope using it

2006-08-01

2006-08-01

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

Microscope objective

C359S660000, C359S740000

Reexamination Certificate

active

07085064

ABSTRACT:
An objective lens includes, in order from the object side, a first lens (L1) with negative power, a second lens (L2) with positive power, an aperture stop (AS), and a third lens (L3) with positive power. A lens component located on the image side of the aperture stop (AS) is constructed with a positive single lens or a plurality of positive single lenses, and the objective lens satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?45<vd1−vd2in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−0.6<f1/f2<−0.3in-line-formulae description="In-line Formulae" end="tail"?where vd1 is the Abbe's number of the first lens, vd2 is the Abbe's number of the second lens, f1 is the focal length of the first lens, and f2 is the focal length of the second lens.

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patent: 2004-145256 (2004-05-01), None

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