G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 7/08 (2006.01) G11B 7/085 (2006.01) G11B 7/09 (2006.01)
Patent
CA 1260138
ABSTRACT: Optical scanning unit. The invention relates to an optical scanning unit for controlling and directing a radiation beam to- wards recording tracks of a surface to be scanned of an information carrier. The scanning unit comprises an ob- jective, a translational position and angular-position detection system for detecting the positions of the ob- jective and an electromagnetic actuating means for cor- recting the position of the objective relative to the in- formation carrier in response to the electrical error sig- nals supplied by said position detection system. The ac- tuating means comprises a movable objective holder with an axial magnetised magnet body whose axial ends are provided with magnet poles and at least three sets of magnet coils situated in the magnet field of the magnet body, which coils are arranged adjacent each other viewed in the cir- cumferential direction of the magnet body and cooperate magnetically with a magnet body via an air gap. The sets of segment coils (32, 34, 36), which each comprise two peripheral coils (32RU, 32RL, 34RU, 34RL, 36RU, 36RL), which are each situated substantially in the magnet field near one of the axial ends of said magnet bodies, and at least one central coil (32M, 34M, 36M) arranged between the peripheral coils, are each elec- trically connected to a matrix circuit (42) via only two amplifiers 43, 44; 45, 46; 47, 48). Fig. 5.
515513
Van Sluys Robert N.j.
Fetherstonhaugh & Co.
N.v. Philips Gloeilampenfabrieken
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