Device for determining a centring error of an optical disc relat

Details Device for determining a centring error of an optical disc relat Device for determining a centring error of an optical disc relat

1986-02-27

1988-08-02

Cardillo, Raymond F.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 58, G11B 726

Patent

active

047617764

ABSTRACT:
A device is described for determining a centring error of a track-shaped information structure in an optical record carrier relative to an axis of rotation of a turntable. The device comprises at least one radiation source and at least one radiation-sensitive detection system with at least two detectors. The output signals of the detectors provide an indication of the direction in which the radiation from the radiation source which is diffracted in a first radial order b(-1) by the information structure. This in turn gives an indication of the position of the center of the track structure. This device enables optical record carriers without center hole to be used.

REFERENCES:
patent: Re30723 (1981-08-01), Heine
patent: 3915576 (1975-10-01), Taylor
patent: 4030835 (1977-06-01), Firester et al.
patent: 4155098 (1979-05-01), Roach et al.
patent: 4180830 (1979-12-01), Roach
patent: 4363118 (1982-12-01), Roach et al.

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