Diffraction grating lens and optical disk recording/reproducing

Optical: systems and elements – Diffraction – From zone plate

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359571, 359575, 359 19, 369 4423, 369112, G02B 518, G02B 532, G02B 2744, G11B 7135

Patent

active

059781394

ABSTRACT:
The invention provides a diffraction grating lens suitable for use as an objective lens for an optical disk recording/reproducing apparatus. This lens includes a light transmissive substrate of which a refractive index is larger than 1, having one plane and the other plane, and a diffraction grating pattern having a lens effect and constituted by a plurality of diffraction gratings formed on one plane of the light transmissive substrate. The diffraction grating pattern is for focusing an incident light beam flux at a focal point provided on a side of the other plane of the light transmissive substrate and is formed so that a numerical aperture, calculated with the focal point as a peak point, becomes larger than 1.

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patent: 5583843 (1996-12-01), Horinouchi
patent: 5764343 (1998-06-01), Tanaka
patent: 5910940 (1999-06-01), Guerra
Appl. Phys. Lett. 65, No. 4 (1994) pp. 388-390, B.D. Terris, et al. "Near-field Optical Data Storage Using a Solid Immersion Lens."

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