SPHERICALLY CORRECTED FRESNEL LENSES
First Claim
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1. A Fresnel lens for producing an aberrationless image of any two points of its optical axis, comprising two optically active faces and a Fresnel system at each of said faces, the meridional section of each of said faces having a form defined by the equation
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Abstract
The optically effective face of a Fresnel lens is so shaped that two separate points in its optical axis are imaged without spherical aberration. Said face carries the Fresnel echelons. If there are echelons on both sides of the Fresnel lens, both echelon carrying faces have a form which is defined by an equation.
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1 Claim
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1. A Fresnel lens for producing an aberrationless image of any two points of its optical axis, comprising two optically active faces and a Fresnel system at each of said faces, the meridional section of each of said faces having a form defined by the equation
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Current AssigneeChristian Hofmann
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Original AssigneeChristian Hofmann
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InventorsHofmann, Christian
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Application NumberUS04/831,281Time in Patent Office662 DaysField of SearchUS Class Current359/743CPC Class CodesG02B 3/08 with discontinuous faces, e...
