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

1995-06-22

1998-07-07

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4427, 369112, G11B 709

Patent

active

057779619

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), 23 Apr. 1987 & JP-A-61 271633.

Affiliated with

Also associated with

Rating

Astigmatic difference correcting method for optical head and app does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Astigmatic difference correcting method for optical head and app, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Astigmatic difference correcting method for optical head and app will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1214172