Optical scanning unit

Details Optical scanning unit Optical scanning unit

G - Physics

11

B

352/32.2

G11B 7/08 (2006.01) G11B 7/09 (2006.01)

Patent

CA 1262963

ABSTRACT: Optical scanning unit. Optical scanning unit with an objective (5) with an optical axis for the focussing of a beam of rays into a scanning spot on the surface of an information carrier. The scanning unit also has an electromagnetic drive device for continuous correction of the position of the objective with respect to the information carrier, the drive device being equipped with an objective mounting (7) for the objective. The objective mounting has a moving ring-shaped magnetic body (200) of a permanent-magnetic material which is arranged coaxially about the optical axis and is equipped with magnetic poles at the axial ends. The drive device is further equipped with fixed coils (204, 205, 206) which inter- act with the said magnetic body via an air gap. Each set of coils is equipped with a first segmental coil (204A, 205A, 206A) which have two active coil parts extending parallel in the peripheral direction of the magnetic body and each of which is located in the vicinity of the axial ends of the centrally positioned magnetic body. The unit is further equipped with at least one second coil (204B, 205B, 206B) which is positioned at least partially between the active coil parts of the above-mentioned first segmental coil. (Fig. 2).

515515

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