Diffractive optical lens

Details Diffractive optical lens Diffractive optical lens

1991-07-17

1992-08-11

Ben, Loha

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

369 4423, 2502016, G02B 308

Patent

active

051384957

ABSTRACT:
A diffractive optical lens of the present invention comprises a grating zone having a plurality of elliptical grooves which are similar in shape to each other so that each major axis is coincided. When light is obliquely incident, it is diffracted by the grating zone and is focused with any astigmatism thereof corrected. The center of each elliptical groove is shifted in one direction of the major axis direction, so that the light which is diffracted is focused with the coma corrected. As a result, even when light is obliquely incident, satisfactory focal characteristics can be obtained without aberrations.

REFERENCES:
patent: 4787722 (1988-11-01), Claytor
patent: 4870632 (1989-09-01), Shiono et al.
patent: 4904069 (1990-02-01), Nakata
T. Fujita, H. Nishihara, and J. Koyama, "Blazed Gratings and Fresnel Lenses Fabricated by Electron-Beam Lithography", vol. 7, No. 12, Optics Letters Dec. 1982, pp. 578-580.
Teruhiro Shiono, Masatoshi Kitagawa, Kentaro Setsune, and Tsuneo Mitsuyu, "Reflection Micro-Fresnel Lenses and Their Use in an Integrated Focus Sensor", vol. 28, No. 15, Applied Optics, Aug. 1989, pp. 3434-3442.

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