Patent ID: 7272082

Claim:
An optical scanning device for scanning an information layer of an optically scannable information carrier, said scanning device comprising: a radiation source, an optical lens system with an optical axis for focusing a radiation beam supplied, in operation, by the radiation source to a scanning spot on the information layer, and an actuator comprising an electric coil system and a magnetic system for displacing the lens system with respect to a stationary part of the scanning device, in a first direction parallel to the optical axis and in a second direction perpendicular to the first direction, the electric coil system comprising a first electric coil and a second electric coil including wire portions directed parallel to the first direction, wherein a point of application of a first force on said wire portions of the first coil, and a point of application of a second force on said wire portions of the second coil are situated in different positions with respect to each other, viewed in a direction parallel to the first direction, said first force and said second force being parallel to the second direction, wherein the electric coil system includes two coil pairs which, viewed in a direction parallel to a third direction directed perpendicularly to the first direction and perpendicularly to the second direction, are situated on either side of and substantially equidistantly from a center of gravity of a mass formed by the optical lens system and a movable part of the actuator, and wherein centers of the first coil and the second coil of each coil pair, viewed in a direction parallel to the first direction, are situated on either side of and substantially equidistantly from the center of gravity.