Optical: systems and elements – Diffraction – From zone plate
Patent
1995-03-30
1998-04-21
Dzierzynski, Paul M.
Optical: systems and elements
Diffraction
From zone plate
359566, 359366, 396535, G02B 2744, G02B 518, G02B 1700, G03B 1702
Patent
active
057424314
ABSTRACT:
A catadioptric lens system may be operated in the telephoto mode to allow images of distant objects to be formed with large image plane magnification and be part of a camera body wherein a rear reflective section of the catadioptric lens system is provided by a front face of the camera body which has a clear aperture centered about the optical axis. An image is focused at the film plane. The catadioptric lens system has a diffractive/refractive hybrid singlet lens which corrects off-axis aberrations and decreases the overall lens length. The front surface of the lens defines an asphere. The back surface has a diffractive lens with annular blazed zones. The back surface also has an inner portion which is reflective and may have the same curvature as the transmissive section of the singlet (the back surface base curve of the from which the blazed zones extend). The lens system provides catadioptric imaging (sometimes called contracurrent or katoptric imaging) at the film plane.
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Principals of Optics-Born and Wolf--p. 155.
Modern Lens Design-Warren Smith -16.1.
Chang Audrey
Dzierzynski Paul M.
Eastman Kodak Company
Short Svetlana Z.
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