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Title:
ANISOTROPIC REFRACTING POWER LENS
Document Type and Number:
Japanese Patent JPH09145991
Kind Code:
A
Abstract:

To obtain an anisotropic refracting power lens which is easily machined and built in by composing the lens of one lens or two cemented lenses.

This lens is a cemented lens 6 which has different horizontal refracting power and vertical refracting power in a plane crossing the optical axis at right angles, and the object-side lens 1 is a lens which has both plane surfaces and also has its refractive index n(r), represented as n2(r)=n02(1-(gr)2), at a distance (r) from the optical axis and the image-side lens 2 is a single lens which is formed out of a homogeneous medium and has a cylindrical surface convex to the image side and has its refractive index represented as n2(r)= n02(1-(gr)2). The object-side surface is a plane which is perpendicular to the optical axis and the image-side surface may be a surface which has a larger- radiation-angle section made convex to the image side and varying in curvature along a curve of large curvature with increase of the distance from the optical axis and also has small-radiation-angle section gradually increasing in curvature from the optical axis to the periphery along from a straight line along a curve that is convex to the image side when viewed from the larger-radiation-angle section.


Inventors:
UEDA TAKESHI
Application Number:
JP30777895A
Publication Date:
June 06, 1997
Filing Date:
November 27, 1995
Export Citation:
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Assignee:
RICOH KK
International Classes:
G02B26/10; G02B13/00; (IPC1-7): G02B13/00; G02B26/10
Attorney, Agent or Firm:
Yoshio Ishibashi