Objective lens system for an endoscope

Details Objective lens system for an endoscope Objective lens system for an endoscope

1988-03-14

1989-09-19

Arnold, Bruce Y.

G02B 1318

Patent

active

048675466

ABSTRACT:
An objective lens system for an endoscope comprising a front lens unit, a stop, and a rear lens unit wherein the front lens unit comprises a lens component arranged that the surface on the object side thereof is formed as an aspherical surface having portions whose curvature is made gradually stronger as they are farther from the optical axis or a lens component arranged that the surface on the image side thereof is formed as an aspherical surface having portions whose curvature is made gradually weaker as they are farther from the optical axis, and the rear lens unit comprises a lens component arranged that the surface on the image side thereof is formed as an aspherical surface having portions whose curvature is made gradually stronger as they are farther from the optical axis or a lens component arranged that the surface on the object side thereof is formed as an aspherical surface having portions whose curvature is made gradually weaker as they are farther from the optical axis, the objective lens system for an endoscope being arranged that distortion and curvature of field are corrected favorably.

REFERENCES:
patent: 4153339 (1979-05-01), Tajima et al.
patent: 4331391 (1982-05-01), Baker
patent: 4403837 (1983-09-01), Nakahashi
patent: 4606607 (1986-08-01), Kurihara

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