G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.21
G11B 7/095 (2006.01) G11B 7/085 (2006.01) G11B 7/09 (2006.01)
Patent
CA 1308192
ABSTRACT: Apparatus for writing and/or reading information in/from a disc-shaped record carrier. The apparatus comprises a light source (7) for producing a light beam, an objective system (8) for focussing the light beam, first detection means (13, 48) for generating a first control signal (S1) which has a value which varies substantially proportionally to the radial distance of the light spot relative to the track over a control range of p/4, p being the track pitch, and radial positioning means (47) for. controlling the radial position of the light spot (P) on the track (Fig. 1) under the influence of said first control signal. The detection means (13, 48) comprise correction means (48) for extending the substantially proportional control range to a value larger than p/4. The detection means (13, 48) derive the first control signal (S1) from the radial error signal (RE) (Fig. 4). Proportional radial positioning control can then be effected in such a way that even for excursions of the light spot up to a maximum of 3p/4 the light spot can still be returned to the track. The resulting position control is far more immune to mechanical shocks (Fig. 3).
551700
Fetherstonhaugh & Co.
Mcgee Philip J.l.
N.v. Philips Gloeilampenfabrieken
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