Optical: systems and elements – Diffraction – From zone plate
Patent
1996-04-10
1998-08-18
Henry, Jon W.
Optical: systems and elements
Diffraction
From zone plate
359566, 359569, 359708, 359718, 359743, G02B 518, G02B 308, G02B 532, G02B 1318
Patent
active
057965200
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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Asahi Kogaku Kogyo Kabushiki Kaisha
Henry Jon W.
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