Astigmatic difference correcting method for optical head and app

Details Astigmatic difference correcting method for optical head and app Astigmatic difference correcting method for optical head and app

1997-11-12

1999-11-02

Young, W. R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, G11B 700

Patent

active

059783451

ABSTRACT:
According to an astigmatic difference correcting method for an optical head, a rotational optical member which is arranged between a first laser beam source having an astigmatic difference and a collimator lens to be rotatable around an optical path of a laser beam of a first wavelength emitted from the first laser beam source is rotated and adjusted. Rotation and adjustment of the rotational optical member is caused to set a minimum difference between focal positions in an X-axis direction and in a Y-axis direction which are perpendicular to the optical path of the laser beam. The laser beam in which the difference between the focusing offset positions is minimum is irradiated on an optical disk having a recording density having a bit length not more than half a laser wavelength.

REFERENCES:
patent: 4564268 (1986-01-01), Tatsuno et al.
patent: 5270997 (1993-12-01), Katayama
patent: 5351224 (1994-09-01), Nagata et al.
patent: 5504726 (1996-04-01), Semba
Small, Light, and Simple Pickups for Optical Disk Systems, "Optical Science", vol. 16, No. 8, pp. 331-338, Aug. 1987.
Patent Abstracts of Japan, vol. 011, No. 129 (P-570), Apr. 23, 1987 & JP-A-61271633.

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