Abstract: An optical scanning device includes an actuator for displacing an objective lens in a first direction parallel to the optical axis of the objective lens, and in a second direction parallel to a radial direction. The actuator includes at least two electrical coils having wire portions directed parallel to the first direction for generating Lorentz forces in the second direction. Points of application of the Lorentz forces on first and second coils of the two coils are in different positions with respect to each other, viewed in a direction parallel to the first direction.

Abstract: The invention relates to an optical player and an optical scanning device (15) used therein for scanning an optical information carrier (9). The scanning device comprises a radiation source (25), a collimator lens unit (35) having a first optical axis (37), an objective lens unit (39) having a second optical axis (41), and an actuator (59) by means of which the collimator lens unit can be displaced in a direction parallel to the first optical axis from a first position (A) to a second position (B), and conversely. Since the collimator lens unit is displaceable, the scanning device can suitably be used to scan information carriers comprising more than one information layer (13) or to scan information carriers having mutually different substrate (11) thicknesses.

Abstract: The invention relates to an optical scanning device (15) comprising an objective lens (45) with an optical axis (41). The scanning device comprises an actuator (57) by means of which the objective lens can be displaced in a first direction (X1) parallel to the optical axis, and in a second direction (X2) parallel to a radial direction (Y). The actuator comprises at least two electrical coils (79, 81) having wire portions (87, 89) directed parallel to the first direction for generating Lorentz forces (F2, F3) in the second direction. According to the invention, a point of application of the Lorentz force (F2) on a first one of the coils (79) and a point of application of the Lorentz force (F3) on a second one of the coils (81) are in different positions with respect to each other, viewed in a direction parallel to the first direction.

Abstract: The invention relates to an optical scanning device (15) comprising an objective lens (45) with an optical axis (41). The scanning device comprises an actuator (57) by means of which the objective lens can be displaced at least in a direction parallel to the optical axis. The actuator comprises a magnetic unit (61) and an electrical coil unit (63) cooperating with the magnetic unit. According to the invention, the magnetic unit is positioned in its entirety, viewed in a direction parallel to an X-direction perpendicular to the optical axis, next to and outside the coil unit, part (95, 97, 101, 103, 107, 109) of the coil unit being present in a magnetic stray field (113, 117) of the magnetic unit. As a result, the dimensions and the mass of a moving part of the scanning device carrying the coil unit and the objective lens can be kept comparatively small.

Abstract: The invention relates to an optical player and an optical scanning device (15) used therein for scanning an optical information carrier (9). The scanning device comprises a radiation source (25), a collimator lens unit (35) having a first optical axis (37), an objective lens unit (39) having a second optical axis (41), and an actuator (59) by means of which the collimator lens unit can be displaced in a direction parallel to the first optical axis from a first position (A) to a second position (B), and conversely. Since the collimator lens unit is displaceable, the scanning device can suitably be used to scan information carriers comprising more than one information layer (13) or to scan information carriers having mutually different substrate (11) thicknesses.