Abstract: A disk conveyance mechanism for a hologram recording and reproducing apparatus includes a first conveyance mechanism for conveying a disk medium 2 to a position where a spindle motor 4 is situated with the disk medium 2 loaded onto a tray 6, a second conveyance mechanism in which the spindle motor 4 is held and moved in the rotational axis direction of the spindle motor 4 to take out the disk medium 2 from the tray 6 and load the disk medium 2 onto spindle motor 4, a third conveyance mechanism for conveying the disk medium 2 to the position where recording and reproducing are performed by the pickup 1 with the disk medium 2 loaded onto the spindle motor 4. The first and third conveyance mechanisms convey the disk medium 2 in a direction substantially parallel to the surface of the medium.

Abstract: The present application relates to an optical disc apparatus for carrying out at least one of recording and reproduction of signals onto or from a data recording surface of an optical disc loaded in the optical disc apparatus. The optical disc apparatus is capable of being thinned and lightened while ensuring a mechanical strength and a stiffness, and also capable of restraining sticking of a flexible printed circuit (FPC) connected to the optical pickup and reducing the sliding resistance of the FPC during movement of the optical pickup.

Abstract: There is provided a disc drive by which the fluid loss of a disc is reduced and the electric power consumption of a spindle motor can be decreased. In the disc drive according to the present invention, a rotation load reducing member is provided between a top cover and the disc. The rotation load reducing member is movably supported by a clearance adjustment member. While the disc is rotating, the rotation load reducing member is moved in the direction approaching the disc. Thereby, the thickness of an air layer on the upper surface of the disc is decreased.

Abstract: An optical disc apparatus including first to fourth disc guides. At the end of disc loading, the first one, in a fixed position, contacts a peripheral side face of the optical disc at a first point thereon to support the disc; the second one has a plane opposite to the peripheral side face which contacts the peripheral side face of the optical disc at a second point to support the disc while restrained from moving away from the side face; the third one contacts the peripheral side face of the optical disc at a third point to support the disc while biased by a spring; and the fourth one contacts the side face at a fourth point while biased by a spring to support the disc, and is restrained from moving against the resilience of the spring. The disc, supported by those disc guides, is chucked by a clamper.

Abstract: The invention makes it possible to carry out an emergency eject motion without attaching and detaching teeth between gears in a transmission system of a driving force of a loading motor, in an optical disc apparatus.

Abstract: Since a disc vibrates in a natural mode at a predetermined rotation speed, a variation in a tilt of the disc relative to an optical head is caused. As a result, the read/write performance of a disc drive is deteriorated. The disc drive has a disc tilt database for recording a relative tilt angle of the disc in a tangential direction thereof associated with the disc natural mode and the disc rotation speed at which such tilt occurs, a circuit for detecting a disc rotation speed, and a tilt drive circuit. An objective lens is tilted so that the relative tilt angle is corrected, and thus, stable read/write performance of the disc drive is achieved.

Abstract: The invention makes it possible to carry out an emergency eject motion without attaching and detaching teeth between gears in a transmission system of a driving force of a loading motor, in an optical disc apparatus.

Abstract: An optical disc drive may include a tray movable for the sake of mounting and dismounting a disc, a disc rotation mechanism arranged at the center to rotate the disc, and a pickup arranged on a backside of the center to write and read the disc within a housing. The optical disc drive may be arranged with a first opening for inhaling outside air in a height range between the bottom surface of the tray and the proximity to the bottom end of the pickup on a back surface or a side surface around a corner on a right side viewed from the backside of the housing, and a second opening for exhausting internal air, arranged higher than a top surface of the tray on the back surface or a side surface around a corner on a left side viewed from the backside.

Abstract: The present invention provides an optical disk apparatus which allows for accurate centering of an optical disk regardless of its placed attitude and in which reliability of chucking operation has been improved, and the apparatus includes a first disk guide 41, a second disk guide 42, a third disk guide 43, and a fourth disk guide 44 for guiding the optical disk to a centering position, the guides being disposed in a chassis 20, and a cam member 47 disposed in the chassis 20, in which when the optical disk is guided to the centering position, the cam member 47 locks at least either the third disk guide 43 or the fourth disk guide 44 to restrain the optical disk from moving to an insertion direction thereof, then releasing the restraint at the time of chucking of the optical disk.

Abstract: An optical disk device in which the thickness of the device is not increased, and interference between the bottom surface of an optical pickup unit (OPU) and a bottom case of the device is prevented upon emergency ejection of an optical disk without moving the optical pickup unit to an outermost peripheral position of the disk in the event of abnormality such as power shutdown during an operation in the optical disk device. A support mechanism having a coil spring is provided at shaft-holders in three of four positions of a guide main shaft and a guide sub shaft to support an OPU, to perform skew adjustment. In another position, a support mechanism having a plate spring is provided such that, upon emergency ejection, the interference between the bottom surface of the OPU and the bottom case is mitigated.

Abstract: An optical disc apparatus including first to fourth disc guides. At the end of disc loading, the first one, in a fixed position, contacts a peripheral side face of the optical disc at a first point thereon to support the disc; the second one has a plane opposite to the peripheral side face which contacts the peripheral side face of the optical disc at a second point to support the disc while restrained from moving away from the side face; the third one contacts the peripheral side face of the optical disc at a third point to support the disc while biased by a spring; and the fourth one contacts the side face at a fourth point while biased by a spring to support the disc, and is restrained from moving against the resilience of the spring. The disc, supported by those disc guides, is chucked by a clamper.

Abstract: An optical disc apparatus capable of being thinned and lightened while ensuring a mechanical strength and a stiffness, and also capable of restraining sticking of an FPC and reducing the sliding resistance of the FPC, comprises a frame, a motor arranged in the frame, for rotating an optical disc loaded in the optical disc apparatus, an optical pickup arranged in the frame so as to be movable in a radial direction of the optical disc, for carrying out at least one of recording and reproduction of signals onto and from a data recording surface of the loaded optical disc, an FPC arranged in the frame, for connecting between the optical pickup and a circuit board, and a unit cover for covering the frame on the mounting surface side of the optical disc, the unit cover having a first zone including an area made into contact with the FPC, and second zones projected toward the mounting surface side of the optical disc from the first zone and located on opposite sides of the first zone so as to interpose a part of the

Abstract: A disc drive unit capable of preventing occurrence of errors in a recording system such as a CD or a DVD, using an optical head for recording data on a disc or reproducing data recorded on the disc. A disc tray is adapted to accommodate the disc, and load and unload the disc. A top cover is arranged above the disc. The top cover is formed therein with a concave and convex part for avoiding positioning a node of each of vibration modes (0, n) (where n=2, 3, 4) caused by a critical rotating speed of the disc, at a position right above the optical head.

Abstract: The invention provides an optical disc apparatus having a dynamic damper mechanism which does not use any part for exclusive use for absorbing a shock of an optical pickup. The optical disc apparatus is provided with a chassis attached to a base chassis via a first elastic body, shafts provided on the chassis, an optical pickup moving on the shaft, and a weight attached to the chassis via a second elastic body, the weight is provided with stoppers on a moving path of the optical pickup.

Abstract: There is provided a disc drive by which the fluid loss of a disc is reduced and the electric power consumption of a spindle motor can be decreased. In the disc drive according to the present invention, a rotation load reducing member is provided between a top cover and the disc. The rotation load reducing member is movably supported by a clearance adjustment member. While the disc is rotating, the rotation load reducing member is moved in the direction approaching the disc. Thereby, the thickness of an air layer on the upper surface of the disc is decreased.

Abstract: Since a disc vibrates in a natural mode at a predetermined rotation speed, a variation in a tilt of the disc relative to an optical head is caused. As a result, the read/write performance of a disc drive is deteriorated. The disc drive has a disc tilt database for recording a relative tilt angle of the disc in a tangential direction thereof associated with the disc natural mode and the disc rotation speed at which such tilt occurs, a circuit for detecting a disc rotation speed, and a tilt drive circuit. An objective lens is tilted so that the relative tilt angle is corrected, and thus, stable read/write performance of the disc drive is achieved.

Abstract: In order to improve internal cooling performance and efficiency by means of introducing outside air of an optical disc drive without using a fan, an optical disc drive of the invention includes a tray movable for the sake of mounting and dismounting a disc, a disc rotation mechanism arranged at the center to rotate the disc, and a pickup arranged on a backside of the center to write and read the disc within a housing. The tray has an opening at its center and partitions the housing in a vertical direction. The optical disc drive is arranged with a first opening for inhaling outside air in a height range between the bottom surface of the tray and the proximity to the bottom end of the pickup on a back surface or a side surface around a corner on a right side viewed from the backside of the housing, and a second opening for exhausting internal air, arranged higher than a top surface of the tray on the back surface or a side surface around a corner on a left side viewed from the backside.

Abstract: In an optical disk apparatus, a rack member includes: a first section formed with a protrusion-shaped engaging portion which engages with the feed screw of a lead screw member; a second section coupled with the base side of an optical pickup; and a third section integrally coupled with the first section and the second section, between both of these sections, and supporting the first section in a double-end-supporting state with respect to the second section, in a plane such as a rotational plane of the lead screw member. This construction enables smooth movement of the rack member in an optical pickup feed mechanism.

Abstract: An optical disk apparatus includes a spindle motor for rotating the optical disk. The optical pickup device records or reproduces information into/from the optical disk, and a guide shaft 6 guides the optical pickup device in a radius direction of the optical disk. The optical disk is transferred by a disk tray 3. The disk tray and the optical pickup device 7 etc. are contained in a casing 1. A heat storage device 10, a phase of which is changed in an operating state of the optical disk apparatus, is arranged in a casing.

Abstract: A disc drive unit capable of preventing occurrence of errors in a recording system such as a CD or a DVD, using an optical head for recording data on a disc or reproducing data recorded on the disc. A disc tray is adapted to accommodate the disc, and load and unload the disc. A top cover is arranged above the disc. The top cover is formed therein with a concave and convex part for avoiding positioning a node of each of vibration modes (0, n) (where n=2, 3, 4) caused by a critical rotating speed of the disc, at a position right above the optical head.