OPTICAL SCANNING DEVICE COMPRISING A TILTABLE LENS SYSTEM
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...
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Zusammenfassung: | 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 OD 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. AS A RESULT, A MECHANICAL TORQUE (M) IS GENERATED BY SAID LORENTZ FORCES ABOUT A TILT AXIS (117) WHICH IS DIRECTED PARALLEL TO A THIRD DIRECTION (X3) PERPENDICULAR TO THE FIRST AND SECOND DIRECTIONS. AS A RESULT, THE OBJECTIVE LENS IS NOT ONLY DISPLACED IN THE SECOND DIRECTION, BUT ALSO TILTED ABOUT SAID TILT AXIS. SAID TITABILITY IS USED TO MAINTAIN A RADIATION BEAM (51) OF THE SCANNING DEVICE (15) IN A POSITION PERPENDICULAR TO AN INFORMATION SURFACE (13) OF AN INFORMATION CARIER (9), SUCH AS A CD OR DVD, TO BE SCANNED.IN A PREFERRED EMBODIMENT, THE ACTUATOR (57) COMPRISES A FIRST PAIR OF COILS (79,81) NEAR A FIRST SIDE (71) OF THE OBJECTIVE LENS (45), AND A SECOND PAIR OF COILS (83,85) NEAR A SECOND SIDE (75) OF THE OBJECTIVE LENS (45) OPPOSITE SAID FIRST SIDE. THE CENTERS OF THE COILS OF THE FIRST PAIR ARE POSITIONED ON BOTH SIDES OF AND AT EQUAL DISTANCES (a) FROM THE CENTER OF GRAVITY (115) OF THE MOVABLE PART OF THE ACTUATOR, VIEWED IN A DIRECTION PARALLEL TO THE FIRST DIRECTION (X1). THE CENTERS OF THE COILS OF THE SECOND PAIR ARE LIKEWISE POSITIONED ON BOTH SIDES OF AND AT EQUAL DISTANCES (a) FROM SAID CENTER OF GRAVITY,(FIG.5) |
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