Objective lens system for endoscopes

Details Objective lens system for endoscopes Objective lens system for endoscopes

1990-10-12

1992-06-02

Sugarman, Scott J.

Optical: systems and elements

Lens

Including a nonspherical surface

359715, 359716, 359740, G02B 1318

Patent

active

051192381

ABSTRACT:
A nearly telecentric objective lens system for endoscopes comprising an aperture stop, and a lens unit which has a positive refractive power and is arranged after said aperture stop, wherein said aperture stop is located at the front focal point of said positive lens unit and a single aspherical surface or a plurality of aspherical surfaces are arranged only in said positive lens unit. Distortion is corrected favorably in the objective lens system for endoscopes.

REFERENCES:
patent: 4662725 (1987-05-01), Nishioka
patent: 4674844 (1987-06-01), Nishioka et al.
patent: 4806001 (1989-02-01), Okabe et al.
patent: 4867546 (1989-09-01), Nishioka et al.
patent: 4976522 (1990-12-01), Igarashi

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