Abstract: In an optical disk drive selectively operable with different kinds of optical disks, an objective lens actuator assembly includes a plurality of objective lenses each assigned to a particular kind of optical disk for converging a laser beam issuing from a light source onto the recording surface of the optical disk. A disk-like lens holder supports the objective lenses on a single circle thereon. A chassis supports the lens holder such that the holder is freely rotatable and freely movable back and forth along its axis of rotation. A focusing actuator is mounted on the chassis for causing the lens holder to move along the axis of rotation. A tracking actuator causes the lens holder to rotate for thereby positioning the lenses. The tracking actuator has a single tracking coil affixed to the circumferential edge of the lens holder, and a plurality of magnets each attracting or repulsing the coil when current is fed to the coil.

Abstract: Disclosed is an optical head device, which has: an optical head for emitting a light beam to an optical disk; a head holder for holding the optical head; a base member which reciprocatively moves the head holder along a radius direction of the optical disk while holding the head holder rotatable around an axis approximately along a tangential line to a track of the optical disk; a rotation energizing means for energizing the rotation of the head holder; and an inclination detecting means for detecting an emission angle of the light beam to a recording surface of the optical disk; wherein the head holder has a center axis for its rotation which passes through near a center of gravity of the entire composition of the head holder including the optical head.

Abstract: Disclosed is an optical disk device, which has: an optical disk; an optical head for writing or reading out information on or from the optical disk; a tilt sensor for detecting an inclination of an information recording surface of the optical disk; a head holding member for holding the optical head and the tilt sensor; a guide rail for guiding the head holding member to move in the direction of a radius of the optical disk; a seek mechanism for giving a reciprocative movement force in the direction of the radius of the optical disk to the head holding member; and a tilt mechanism for adjusting an inclination of the head holding member to the optical disk on information obtained from the tilt sensor; wherein the optical head and the tilt sensor are disposed on the head holding member and are opposite to each other while sandwiching the optical disk with respective predetermined clearances from the optical disk.