Objective optical system and endoscope

Details Objective optical system and endoscope Objective optical system and endoscope

2009-06-02

2010-11-30

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C600S108000

Reexamination Certificate

active

07843655

ABSTRACT:
An objective optical system includes, a first group having positive refractive power, a second group having positive refractive power, the first group having a first parallel flat plate, a diaphragm, a second parallel flat plate and a first plano-convex lens with its convex surface facing the image side in the above mentioned order as viewed from the object side, the first parallel flat plate, the second flat parallel plate and the first plano-convex lens forming a cemented lens, the second parallel flat plate being formed by an infrared absorption filter, the second group having a second plano-convex lens with its convex surface facing the object side.

REFERENCES:
patent: 6118590 (2000-09-01), Chiba
patent: 6134056 (2000-10-01), Nakamuka
patent: 7738180 (2010-06-01), Igarashi
patent: WO99/06866 (1999-02-01), None

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