Optical: systems and elements – Diffraction – From zone plate
Patent
1996-06-19
1998-02-03
Henry, Jon W.
Optical: systems and elements
Diffraction
From zone plate
359572, G02B 2744, G02B 518, G02B 308, G02B 902
Patent
active
057150915
ABSTRACT:
A hybrid refractive and diffractive achromatic lens suited for single-use or inexpensive single-lens cameras operating in visible spectral range. The lens comprises a body of optically transmissive material having an index of refraction at a wavelength approximately at the center of said range of at least 1.45. The lens body having a first and second surface on opposite sides thereof, at least one of said surfaces being curved to provide a refractive portion having power and introduces chromatic aberration, the lens having a diffractive portion having power which substantially achromatizes the lens for the chromatic aberration of the refraction portion over about 440 nm to about 650 nm range.
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Eastman Kodak Company
Henry Jon W.
Short Svetlana Z.
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