Optical: systems and elements – Diffraction – From zone plate
Patent
1997-09-17
1999-11-02
Henry, Jon
Optical: systems and elements
Diffraction
From zone plate
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: 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."
Hatakoshi Gen-ichi
Yamamoto Masahiro
Henry Jon
Kabushiki Kaisha Toshiba
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