Objective lens system for endoscopes

Details Objective lens system for endoscopes Objective lens system for endoscopes

1990-05-08

1992-12-29

Sugarman, Scott J.

Optical: systems and elements

Lens

Including a nonspherical surface

359644, 359645, 359663, 359714, 359715, 359723, G02B 1318, G02B 520

Patent

active

051756501

ABSTRACT:
An objective optical system for endoscopes comprising, in the order from the object side, a front negative lens unit, an aperture stop, a positive lens unit comprising at least one positive lens component, and an infrared cut filter arranged immediately before said aperture stop, said objective optical system being adapted so as to allow rays to be incident on said filter at heights lower than the outside circumference of said filter.

REFERENCES:
patent: 4806001 (1989-02-01), Okabe et al.
patent: 4867546 (1989-09-01), Nishioka et al.
patent: 4986642 (1991-01-01), Yokota et al.

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