Abstract: The present invention relates to a disc drive apparatus capable of preventing skew or wobble from occurring when a spindle motor is attached to a base. The disc drive apparatus according to the present invention comprises: a turntable 22 which holds an optical disc 2; a spindle motor which rotatively drives the turntable 22; an optical pick-up 20 which writes/reads signals on or from the optical disc 2; guide shafts 42a and 42b which slidably supports the optical pick-up 20 in the radial direction of the optical disc 2, and a base 15 to which a spindle motor 23 and both end portions of each of the guide shafts 42a and 42b, wherein the spindle motor 23 is attached to the base 15 through a spacer member 28 which performs positioning of the turntable 22 in the vertical direction thereof relative to the base 15.

Abstract: An optical disc drive apparatus having a skew servo mechanism in which end portions of a pair of parallel running guide shaft members for guiding an optical pickup unit are slidably secured to a chassis on which a spindle motor having a turntable is mounted to be rotationally driven in a radial direction by a pair of pivot members, and other end portions of the pair of the guide shaft members are rotatably driven in the radial direction by first and second cam surfaces of a sliding cam which is driven in a direction orthogonally intersecting the pair of the guide shafts based on a result detected by a skew detecting element.

Abstract: An optical disc drive apparatus comprising a skew servo mechanism M1 in which one end portions of a pair of parallel running guide shaft members for slidably guiding an optical pickup unit are slidably secured to a chassis on which a spindle motor having the turn table is mounted to be rotationally driven in the radial direction by a pair of pivot members, and then, based on the result detected by a skew detecting means, the other end portions of the pair of the guide shaft members are rotatably driven in the radial direction by the first and second cam surfaces of a sliding cam which is slidably driven in the direction orthogonally intersecting the pair of the guide shafts.

Abstract: A disk drive apparatus that provides for a positional relationship between an optical disk and an optical pickup device to be set in a predetermined initial state before an information storage and reproducing operation. The disk drive apparatus includes a disk table that is rotated by a spindle motor and onto which an optical disk is loaded and an optical pickup device for recording and reproducing information on and from the optical disk. The disk drive apparatus further includes a skew sensor for detecting the inclination of a light beam's optical axis relative to the optical disk, a skew control mechanism for adjusting that inclination, a reference portion detected by the skew sensor, and control means. The control means sets the skew control mechanism in its predetermined initial state based on an output from the skew sensor obtained from detection of the reference portion.

Abstract: An optical pickup device which assures interchangeability between plural types of optical discs with different layered structures, such as CD, CD-R or DVD, which is reduced in size and which realizes reproduction of high reliability information signals.

Abstract: The present invention provides a disc drive apparatus which identifies a type of a disc mounted on the apparatus by using reflected beam data obtained from a laser beam focused on the disc surface and other reflected beam data obtained from the laser beam being focused on the disc signal plane. For example, while forcibly changing the laser beam focusing point within a variable range at a predetermined velocity, a luminous energy signal or a focus error signal is used to count a time difference between a timing of focusing on the disc surface and a timing of focusing on the disc signal plane. According to the time difference obtained, the disc mounted is identified as a first type of disc or a second type of disc.

Abstract: An optical pickup device which assures interchangeability between plural types of optical discs with different layered structures, such as CD, CD-R or DVD, which is reduced in size and which realizes reproduction of high reliability information signals.

Abstract: An optical disc driving device employing an optical disc as a recording medium. The device includes a skew control mechanism for controlling relative tilt between an optical disc and an objective lens for selectively recording and/or reproducing data on or from a first optical disc having a standard recoding density and a second optical disc having a high recording density. The relative tilt between the second optical disc and the objective lens is controlled by the skew control mechanism only when the second optical disc is loaded and data is recorded and/or reproduced on or from the second optical disc.

Abstract: An apparatus for recording and reproducing information stored on a photomagnetic disc, includes a magnetic head which produces magnetic field. The apparatus comprises a carriage radially movable with respect to the photomagnetic disc. A head supporting mechanism is shiftably disposed on the carriage between a loading position where the magnetic head is contacted with the end face of the photomagnetic disc to apply the magnetic field thereto and an unloading position where the magnetic head is disposed remote from the end face of the photomagnetic disc to be prevented from applying the magnetic field thereto. A locking mechanism is shiftable between a locking position where the locking mechanism engages the head supporting mechanism and a release position where the locking means disengages the head supporting mechanism. A driving mechanism is so constructed as to be energized during shifting movement of the locking mechanism between the locking position and the release position.

Abstract: A magnet-optical disk drive device comprises a disc driving mechanism which includes a drive shaft powered by an electric motor. A magnet-optical disc is detachably connected to the drive shaft. A magnetic field modulation head is positioned at one side of the disc, and an optical unit is positioned at the other side of the disc. A moving mechanism is employed for moving both the magnetic field modulation head and the optical unit in a radial direction of the disc. The magnetic field modulation head is of a floating type wherein a head proper is forced to float above the surface of the disc due to the force of an air flow which is produced when the disc is rotated.

Abstract: The present invention provides a disc drive apparatus having an improved tracking control and seek time adjustment. The head tracking error distribution along the disc radius is determined with reference to the phases of a plurality of position sensors and is calculated based on the tracking error of a reference track in first and second reference regions with respect to the signal from one of the position sensors. This information is used to determine the tracking error distribution along the disc radius with respect to that one of the position sensors. The tracking error distribution is used to determine the tracking error of a reference track in a third reference region with respect to the signal from the same position sensor. This tracking error is used to determine the tracking error of other reference tracks in the third reference region with respect to the signals from other of the position sensors.