Super-resolution optical head using optical separator

Details Super-resolution optical head using optical separator Super-resolution optical head using optical separator

1994-12-27

1996-12-31

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4424, 369112, 369117, G11B 700

Patent

active

055901107

ABSTRACT:
A super-resolution optical head device in which a first super-resolution spot having a diameter smaller than that of a diffraction limit is formed on a recording medium by modulating beams emitted from a laser light source includes an optical system, an optical separator and a plurality of optical detectors. By the optical system, the laser beams reflected from the recording medium are converged and a second super-resolution spot is reimaged. The optical separator is constituted by a reflection-type pinhole, a diffraction-type pinhole, a refraction-type pinhole, a reflection-and-absorption type pinhole, or a set of a reflection-type pinhole and a reversed-type pinhole, which is placed at the reimaged position and optically separates the second super-resolution spot into a main beam component and a sidelobe component. The optical separator leads to the optical detectors the main beam component and the sidelobe component independently from each other. The device enables to easily obtain reproduction signals with little deterioration caused by the sidelobe component.

REFERENCES:
patent: 5121378 (1992-06-01), Hirose et al.
patent: 5172366 (1992-12-01), Chikuma
patent: 5206852 (1993-04-01), Kim et al.
patent: 5349592 (1994-09-01), Ando
patent: 5434840 (1995-07-01), Ezuka et al.
patent: 5450376 (1995-09-01), Matsumura et al.

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