H - Electricity – 02 – K
Patent
H - Electricity
02
K
310/63
H02K 41/02 (2006.01) B23Q 1/36 (2006.01) G11B 7/08 (2006.01) G11B 7/09 (2006.01) H02K 41/035 (2006.01)
Patent
CA 1192592
ABSTRACT OF THE DISCLOSURE A two axis linear motor for carrying the objective lens for optical focusing and optical tracking in an optical recording system has a stationary structure for providing a magnetic field and a moving armature structure. The stationary structure may have two permanent magnets and several pole pieces to properly shape the field with respect to the armature. In one embodiment, a central elongated pole piece and two parallel adjacent elongated pole pieces are associated with two permanent magnets to form flux gaps with the central pole piece. Flux returns to the magnets through a lower pole piece to which the central pole piece is attached. The central and lower pole pieces have an aperture through which the laser beam may pass on its way to and from the objective lens. The objective lens is carried by the armature body and positioned over the aperture in the central structure. The armature body has focus coil windings in one orientation and tracking coil windings in an orthogonal orientation. The tracking coil windings cause the armature to move back and forth in the direction of the elongated central magnet structure over which the armature fits. The tracking direction of the armature is radial with respect to the recording tracks on an optical recording disk. The focus coil windings cause the armature to move up and down maintaining a constant distance between the objective lens and the optical media to keep the laser beam passing through the objective lens in focus. Focusing motion and tracking motion may occur simultaneously or in any desired combination. The armature structure is supported by a suspension flexure structure which eliminates rolling and yawing as well as translation in directions other than the focus or tracking directions of the armature structure. The moment of mass of the armature is centered in the suspension to reduce pitching of the armature about the axis perpendicular to the tracking axis of the armature structure.
438110
Berg Thomas E.
Pollard Christopher A.
Magnetic Peripherals Inc.
Smart & Biggar
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