Optical: systems and elements – Diffraction – From zone plate
Patent
1998-03-23
2000-03-21
Spyrou, Cassandra
Optical: systems and elements
Diffraction
From zone plate
359571, 359716, 359740, 359784, G02B 2744, G02B 302, G02B 900
Patent
active
060409436
ABSTRACT:
A lens system having a reduced number of injection-molded singlet lens elements with at least one diffractive surface to control axial and lateral chromatic aberrations is disclosed. In one embodiment, the diffractive surface is placed on the first surface of the third lens, which is closest to the image plane. An opaque spacer provides suppression of stray light from reaching the image plane.
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G. J. Swanson, "Binary Optics Technology: The Theory and Design of Multi-Level Diffractive Optical Elements", Technical Report 854, Massachusetts Inst. Techn., Lincoln Laboratory, Aug. 1989.
Donnelly Optics
Jr. John Juba
Spyrou Cassandra
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