Optical: systems and elements – Diffraction – From zone plate
Patent
1992-06-10
1997-05-06
Epps, Georgia Y.
Optical: systems and elements
Diffraction
From zone plate
359575, G02B 2744, G02B 518
Patent
active
056276796
ABSTRACT:
The optical system of the invention includes a phase type Fresnel zone plate 5. The zone plate 5 includes thereon a central zone C located around the optical axis, through which light flux 2 emanating from an object and having a relatively small divergence angle passes, and a peripheral zone P located on the outside thereof. The central and peripheral zones C and P have given Fresnel pitches and blazing angles, so that the peripheral zone P can make use of diffraction higher in order than that used by the central zone C to obtain the desired refractive power. Although the minimum pitch of the phase type Fresnel plate zone is thus relatively larger in the peripheral zone P, the optical system is not only satisfactory in terms of the effect on correction of chromatic aberration and refractive power but ensures a good image surface contrast as well.
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Epps Georgia Y.
Mack Ricky
Olympus Optical Co,. Ltd.
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