Chromatic aberration correcting element and its application

Details Chromatic aberration correcting element and its application Chromatic aberration correcting element and its application

1995-02-09

1999-06-22

Epps, Georgia

Optical: systems and elements

Lens

With multipart element

359837, G02B 308, G02B 504

Patent

active

059148225

ABSTRACT:
A chromatic aberration correcting element that is a simple lens having at least one aspheric surface the radius of curvature of which increases from the optical axis toward the periphery, at least either one of the surfaces being formed as a diffraction lens surface that consists of annular segments in steps that are shifted discretely in a direction in which the lens thickness increases as a function of the distance from the optical axis. Also, a chromatic aberration correcting device having annular segments formed in steps on either a light entrance face or a light exit face or both, the annular segments being composed of planes perpendicular to and concentric with the optical axis.

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