Device for determining a centring error of a round...

Details Device for determining a centring error of a round... Device for determining a centring error of a round...

G - Physics

11

B

340/136, 352/32.

G11B 7/00 (2006.01) G11B 7/013 (2006.01) G11B 7/095 (2006.01) G11B 7/24 (2006.01) G11B 7/26 (2006.01) G11B 17/34 (2006.01) G11B 33/10 (2006.01)

Patent

CA 1271258

ABSTRACT: "Device for determining a centring error of a round track-shaped information structure in an optical record carrier relative to the axis of rotation of a turntable supporting the record carrier, apparatus provided with such a device, and record carrier intended for use in conjunction with said device" A device is described for determining a centring error of a round track-shaped information structure (3, 4) in an optical record carrier (1) relative to an axis of rotation (Z) of a turn- table (46, 60). The device comprises at least one radiation source (5, 5') and at least one radiation-sensitive detection system (9, 9') comprising at least two detectors (10, 11; 10', 11'), the out- put signals of the detectors providing an indication about the direction of the radiation from the radiation source which is dif- fracted in a first radial order b(-1) by the information structure, and hence about the position of the centre (M) of the track structure (4). This device enables optical record carriers (1) without centre hole to be put to practical use. Fig. 1.

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