Abstract: A removable cover assembly for a data storage device comprises a first cover coupled with a casing base of a data storage device via a plurality of screws. A second cover is disposed upon a rib of the casing base and is coupled with the rib. The second cover is configured with a groove which delineates a perimeter separating an interior region of the second cover from an exterior region of the second cover. A space between the first cover and the casing base is filled with a low-density gas. The groove defines the region in the second cover in which separation of the interior region from the exterior region is to occur to expose the screws.

Abstract: An optical pickup, an optical disk drive device, an optical information recording device, and an optical information reproduction device in which a reproduction signal, a focus error signal, and a gap error signal can be detected with high accuracy when information is recorded/reproduced on/from an optical information medium having a plurality of information recording layers. The optical pickup includes a focusing lens group (7) that includes a solid immersion lens (8) and focuses the light; a first detection lens (11) that focuses the reflected light from an optical information medium (9) on a first detector (12), and a second detection lens (13) that focuses the reflected light from the flat surface portion of the solid immersion lens (8) on a second detector (14).

Abstract: The disk drive device includes a base member, a hub, a bearing unit which is arranged on the base member and which rotatably supports the hub, and a spindle drive unit which drives the hub to rotate. The spindle drive unit includes a stator core having a salient pole, a coil wound around the salient pole and a magnet opposed to the salient pole. The hub formed of magnetic material includes an outer cylinder portion engaged with an inner circumference of a recording disk and an inner cylinder portion to which an outer circumference of the magnet is fixed. The diameter of the inner cylinder portion is larger than the diameter of the outer cylinder portion.

Abstract: A rotor hub includes a shaft connecting portion arranged to be connected to a shaft serving as a central axis, a disk loading portion centered about the central axis and arranged to support a disk shaped storage medium mounted thereon, a yoke arranged below the disk loading portion and supporting a field magnet at one of an inner side surface thereof and an outer side surface thereof, and a flexible portion connecting the disk loading portion to the yoke and being flexible with respect to a force applied thereto from the yoke.

Abstract: A spindle motor includes a stationary portion and a rotating portion including a seal defining portion. The stationary portion includes a shaft portion, an annular member fixed to an upper portion of the shaft portion in, for example, a tight-fitting condition, and a cap member. A radially inner end portion of the cap member is fixed to each of the shaft portion and the annular member preferably through, for example, an adhesive. An upper seal portion, in which a surface of a lubricating oil is arranged, is defined in an upper seal gap defined between an outer circumferential surface of the annular member and an inner circumferential surface of the seal defining portion. The cap member is arranged to cover an upper side of the upper seal portion.

Abstract: The invention provides an optical pickup device and a method of manufacturing the optical pickup device that allows an optical device to come to be held after one principal surface of a housing is covered with a covering plate. Most of the principal surface of the optical pickup device provided with the objective lens is covered with the cover. A hole is provided by partially removing the cover at a portion corresponding to the position where a light emitting device is to be disposed. In this manner, even after the housing is covered with the cover, the optical device can be touched through the hole.

Abstract: A spindle motor includes a stator unit and a rotor unit. The stator unit includes a stator, a base portion, and a printed circuit board. The printed circuit board has a connection portion and an extending portion extending from the connection portion. The base portion is provided on its lower surface with a recess portion arranged to accommodate the connection portion of the printed circuit board and a groove portion in which the extending portion is arranged, the groove portion communicating with the recess portion. The groove portion has a bottom surface on which the extending portion is arranged and a slant surface gradually sloping downwards as it extends away from the bottom surface in a circumferential direction. The region in the recess portion extending from the connection portion to a boundary between the recess portion and the groove portion is covered with a cured flowable resin material.

Abstract: A spindle motor includes a stator unit and a rotor unit. The stator unit includes a stator, a base portion, and a printed circuit board. The printed circuit board has a connection portion and an extending portion extending from the connection portion. The base portion is provided on its lower surface with a recess portion arranged to accommodate the connection portion of the printed circuit board and a groove portion in which the extending portion is arranged, the groove portion communicating with the recess portion. The groove portion has a bottom surface on which the extending portion is arranged and a slant surface gradually sloping downwards as it extends away from the bottom surface in a circumferential direction. The region in the recess portion extending from the connection portion to a boundary between the recess portion and the groove portion is covered with a cured flowable resin material.

Abstract: A spindle motor for use in a disk drive apparatus includes stationary and rotating portions. The stationary portion includes a shaft including a thrust plate. A sleeve portion includes an axial end surface arranged opposite the thrust plate. A first seal member is arranged opposite the thrust plate on an opposite side with respect to the sleeve portion. The thrust plate preferably includes a plate communicating hole arranged to connect first and second thrust gaps defined, respectively, between the thrust plate and the sleeve portion and between the thrust plate and the first seal member. The sleeve portion preferably includes a sleeve communicating hole arranged to connect the first thrust gap with an opposite axial side thereof. A lubricant is arranged to fill a communicating channel extending from a first to a second capillary seal portion through the plate communicating hole and the sleeve communicating hole.

Abstract: An integrated disk driving module is disclosed, the module including a base unit including a spindle motor fixture including an opening-formed upper plate, a lateral surface plate bent from the upper plate to form an accommodation space, and a spindle motor fixture concavely formed from the upper plate toward the accommodation space, wherein the spindle motor fixture is integrally formed with the upper plate; and a spindle motor fixed inside the spindle motor fixture to rotate a disk.

Abstract: There is provided an encoder sensor according to an exemplary embodiment of the present invention. The encoder sensor may include: a light emitting unit and a light receiving part disposed at a distance in a readable range of an encoding mark of a disk; a receiving part receiving the light emitting unit and the light emitting unit; and a lead frame extending into an opposite direction of the disk from the receiving part and electrically connected to a printed circuit board.

Abstract: Disclosed herein is a slip prevention member for a turntable. A friction layer prevents a slip of a disk placed on an upper surface thereof. A hardness reinforcing layer is provided under the lower surface of the friction layer. An adhesive layer is provided under the lower surface of the hardness reinforcing layer. A releasable sheet is attached to the lower surface of the adhesive layer. The slip prevention member reduces use of environmentally toxic material and uses the hardness reinforcing layer, thus preventing occurrence of vibrations and noise which may be induced when the hardness of the slip prevention member is relatively low.

Abstract: Disclosed is a disc clamp including a disc clamp body having a rotational axis hollow engaged with a rotational axis; a first disc balancer that is projected from the disc clamp body in the horizontal direction and formed in a first thickness A; and a second disc balancer that is bent downwards from an end of the first disc balancer in order to fix the disc and formed in a second thickness B, wherein an angle formed between a horizontal surface of the first disc balancer and the second disc balancer is from 92° to 95°.

Abstract: A clamp 1 for a disk rotation driving device 3 has a centering hole 18 and a contact portion 17. The centering hole 18 is fitted to an outer circumference of a centering projection 19 of a hub 7 of the disk rotation driving device 3. A clamping screw 21 is screwed into an axial center of the hub 7 so that a fastening head 23 of the clamping screw 21 fastens the clamp 1 to the hub 7 and so that the contact portion 17 of the clamp 1 comes in contact with an information recordable magnetic disk 5 attached to the hub 7 and applies pressing load onto the disk 5 in a rotation axis direction. The clamp 1 includes a centering cylinder 13 bent in an axial direction. The centering cylinder 13 has a circumferential inner surface. The inner surface defines the centering hole 18. The rounded section 29 is provided along an edge of the centering hole 18 and has a radius smaller than the thickness of the centering cylinder 13. The fastening surface 25 is continuous to the rounded section 29.

Abstract: A disk drive is disclosed. The disk drive can include includes a spindle motor, which can rotate a disk; an encoder, which can detect the rotational speed of the disk; an encoder holder, which secures the encoder; and a base plate, which supports the spindle motor, and in which a holder indentation is formed for inserting the encoder holder in. Certain embodiments of the invention allow easy height adjustments for the encoder holder, so that the encoder may maintain a particular distance from the disk, and also allow the encoder to be fitted onto the base plate, even in cases where the base plate has a limited mounting area.

Abstract: A micro-mechanical structure system according to the present invention includes: a movable structure 5, at least a portion of the movable structure 5 being formed of a single-crystalline material; an elastic supporting member 10 for supporting the movable structure 5; a stationary electrode section 13, 25 at least partially opposing the movable structure 5; and a base 22 which has a circuit section and to which the stationary electrode 13, 25 is affixed. The stationary electrode section 13, 25 includes a first electrode layer (upper stationary electrode layer) 13 positioned relative to the movable structure 5 and a second electrode layer (lower stationary electrode layer) 25 positioned relative to the base 22, the first electrode layer 13 and the second electrode layer 25 being bonded to each other via adhesion layers 15 and 16.