Superresolution optical pickup apparatus

Details Superresolution optical pickup apparatus Superresolution optical pickup apparatus

1998-04-22

2000-02-15

Le, N.

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B41J 247

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060258667

ABSTRACT:
An optical pickup apparatus including a polarization plane rotary unit arranged between a semiconductor laser and an objective lens, and a polarizing film arranged between the polarization plane rotary unit and the objective lens. The polarization plane rotary unit includes liquid crystal, two glass plates sandwiching the liquid crystal, and transparent electrodes patterned to a predetermined configuration on an inner face of these glass planes. The polarization plane rotary unit permits passage of the laser beam without rotating the plane of polarization of the entire laser beam at the time of recording, and permits passage of the laser beam with the plane of polarization of the center portion of the laser beam rotated and the plane of polarization of the remaining outer portion of the laser beam not rotated at the time of reproduction. Only the outer portion of the laser beam is focused on a magneto-optical disk in a reproduction mode, so that a main beam of a small spot is formed by mutual interference. Since the plane of polarization of the laser beam directed on the magneto-optical disk is not rotated, the Kerr angle of rotation can be detected at high accuracy. As a result, the reproducibility is improved.

REFERENCES:
patent: 5150234 (1992-09-01), Takahashi et al.
patent: 5796683 (1998-08-01), Sumi et al.
MAG 96-200, IEEE Japan, Nov. 29, 1996, pp. 1-8--(partial translation).

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