Focusing more than 30 depths from an aplanatic point of a plano-

Details Focusing more than 30 depths from an aplanatic point of a plano- Focusing more than 30 depths from an aplanatic point of a plano-

1998-05-11

2000-05-16

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 359664, G11B 700

Patent

active

060646411

ABSTRACT:
A device for optically scanning a record carrier with radiation beam having a high numerical aperture. The radiation beam is focused on the record carrier by an objective lens and a plano-convex lens. The plano-convex lens has a gap with the record carrier of several tens of micorometers. It focuses the radiation beam to a point at least 30 focal depths away from an aplanatic point of the plano-convex lens. As a consequence, the lens has a relatively large tolerance for sideways movements.

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patent: 5610734 (1997-03-01), Aharoni et al.
patent: 5699197 (1997-12-01), Otaki
patent: 5729393 (1998-03-01), Lee et al.
patent: 5764613 (1998-06-01), Yamamoto et al.
patent: 5881042 (1999-03-01), Knight

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