Calibrating an optical detector to minimize noise from undesired

Details Calibrating an optical detector to minimize noise from undesired Calibrating an optical detector to minimize noise from undesired

1997-09-08

1999-06-15

Dinh, Tan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369274, 369 53, G11B 724

Patent

active

059128747

ABSTRACT:
A magnetooptical disk recording device has a far-field detector for detecting radial position of a laser beam with respect to tracks on the disk. The far-field detector has a reference line dividing first and second photo detectors. The reference line is centered radially with respect to center lines of the tracks. The reference line is also center lengthwise to be tangentially center with respect to a tangential point on the track. The detector is adjustable both radially and tangentially. The tangential adjustment is based upon sensing two low reflective calibration marks on the disk that indicate centering the laser beam, hence the track tangent point, on the reference line. The calibration is based upon obtaining minimum noise in the detector output signal that signifies that the laser beam is centered on the length of the detector reference line. The calibration marks are in a mirror area disposed at one radial extremity of the disk. The marks are radially elongate and disposed in a radially outward diverge with respect to each other. The marks are disposed at 45 degrees with respect to two circumferentially spaced apart radial lines of the disk.

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