Title:
【発明の名称】内視鏡用非球面対物レンズ
Document Type and Number:
Japanese Patent JP2628627
Kind Code:
B2
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.
Inventors:
Nishioka Kimihiko
Kikumi Tojo
Akira Yokota
Kikumi Tojo
Akira Yokota
Application Number:
JP206485A
Publication Date:
July 09, 1997
Filing Date:
January 11, 1985
Export Citation:
Assignee:
Olympus Optical Co., Ltd.
International Classes:
G02B13/04; G02B13/18; G02B23/24; (IPC1-7): G02B13/18; G02B13/04
Domestic Patent References:
| JP39137916A |