Abstract: A thin film magnetic head includes a recording pole layer that is divided into a tip portion, a wide rear portion, a flare portion, and a yoke portion as viewed from the air bearing surface (ABS). The tip portion and the wide rear portion directly contact a write gap layer. Part of the wide rear portion has a greater width that the tip portion. The wide rear portion is provided between the tip portion and the flare portion to reduce magnetic reluctance. Accordingly, it is possible to improve the pattern accuracy of the tip portion width by providing the flare portion, which reflects a large quantity of light, far from the ABS, while preventing an increase of the magnetic reluctance.

Abstract: A magnetic head positioner assembly comprises a plurality of magnetic head support members individually provided with magnetic heads, an arm, and a movable coil which is held by the movable coil support portion provided for the arm and which is provided to drive the arm. The arm has a plurality of holder arms for individually supporting each of the magnetic head support members and a rotatable bearing portion or the center of driving each of the holder arms. Moreover, the rotatable bearing portion and two holder arms are integrated with each other into an arm unit. The aforementioned arm is formed by combining and bonding at least two arm units with each other being spaced by a predetermined spacing.

Abstract: A shroud feature and method for incorporating an airflow shroud feature in a disc drive assembly. The airflow shroud feature is connected to the cover of the disc drive rather than the base plate. When the disc drive cover incorporating the shroud feature is placed on the disc drive, the shroud feature surrounds at least a portion of the circumference of the outer peripheral surface of the disc to reduce turbulence when the disc is operated. The shroud is rigidly connected to the top cover by engagement of the shroud with a physical feature of the top cover. The shroud operably directs air-flow along the peripheral edge of the disc during drive operation when the cover is installed on the base plate.

Abstract: This invention teaches a way for the shield to shield (S1-S2) distance of a magnetic read head to be reduced. The key feature is that the upper and lower dielectric layers D1 and D3, which are normally pure aluminum oxide, have each been replaced by a bilayer dielectric, which consists of aluminum oxide in contact with the shield layer followed by a layer of a high voltage breakdown material. For D1 this layer may be either tantalum oxide or tantalum nitride while for D3 our preferred material has been tantalum oxide. The addition of the two high breakdown layers allows the thickness of the upper and lower dielectric layers to be reduced without having to reduce the S2—S2 voltage difference.

Abstract: In an Integrated Lead Suspension system, it is desired that the stainless steel suspension is grounded to a controlled ground potential. This requires creating a grounding path between the stainless steel suspension and a copper trace layer through a layer of dielectric material that separates the stainless steel suspension and the copper layer. The copper trace layer and subsequently the stainless steel suspension can then be grounded to a controlled ground potential. This invention proposes several methods of creating a ground path between the stainless steel suspension and the copper trace layer.

Abstract: In a magnetic tape cartridge comprising a thin cartridge casing having flat upper and lower surfaces and a single reel which is housed in the cartridge casing for rotation and around which a magnetic tape is wound, island-like or point-like projections are provided at least three places of the lower surfaces of the cartridge casing near the leading edge and the trailing edge of the cartridge casing as viewed in the direction X of insertion of the magnetic tape cartridge in a recording and reproducing apparatus and recesses which are adapted to be engaged with the projections are provided on the upper surface of the cartridge casing so that, when a plurality of the magnetic tape cartridges are stacked, the projections and the recesses of the cartridge casings of magnetic tape cartridges which are just above and below each other are engaged with each other, whereby the magnetic tape cartridges are prevented from being displaced with respect to each other when a plurality of magnetic tape cartridges are stacked

Abstract: A single reel with magnetic tape wound thereon is housed in a case. A restraining member, for restricting rotation of the reel by moving toward or away from the reel, is urged in a restraining direction by an urging member. The pushing-up portions of a releasing member are inserted into the through holes bored in the reel gear of the reel 2 so that the lower ends can abut a driving gear. The releasing member moves the restraining member in a releasing direction by moving according to the chucking operation of drive-side rotation drive means. In this manner, reel-rotation restraining means allows rotation of the reel when being used and restricts the rotation when not being used. In this construction, each of the through holes is bored between the tooth edges of the reel gear so that the releasing member can perform a reliable releasing operation.

Abstract: A single reel with magnetic tape wound thereon is housed in a case. A restraining member, for restricting rotation of the reel by moving toward or away from the reel, is urged in a restraining direction by an urging member. The pushing-up portions of a releasing member are inserted into the through holes bored in the reel gear of the reel 2 so that the lower ends can abut a driving gear. The releasing member moves the restraining member in a releasing direction by moving according to the chucking operation of drive-side rotation drive means. In this manner, reel-rotation restraining means allows rotation of the reel when being used and restricts the rotation when not being used. In this construction, each of the through holes is bored between the tooth edges of the reel gear so that the releasing member can perform a reliable releasing operation.

Abstract: An optical information recording medium includes a transparent substrate, a thin film layer formed on said transparent substrate and having a recording film, a thin film protecting film formed on said thin film layer, and a substrate protecting film formed on said transparent substrates. A neutral plane of deformation caused by a temperature change of the optical information recording medium is present within the thin film layer. Consequently, it has become possible to provide an optical information recording medium which can prevent deformation (warpage) caused by temperature and humidity changes and be readily manufactured.

Abstract: A recording and reproducing apparatus includes a guide post for pulling out a tape-shaped recording medium from a cassette and wrapping the tape-shaped recording medium around a rotary drum, a guide base which supports the guide post, the guide base being movable between a first position in which the cassette can be loaded and a second position in which a recording or reproducing action can be performed with the tape-shaped recording medium wrapped around the rotary drum at a predetermined angle, and an elastic member for, after the guide base moves from the first position to the second position, urging the guide base toward the second position to position the guide base at the second position. The elastic member is disposed on an upper surface of the guide base.

Abstract: A single reel with magnetic tape wound thereon is housed in a case. A restraining member, for restricting rotation of the reel by moving toward or away from the reel, is urged in a restraining direction by an urging member. The pushing-up portions of a releasing member are inserted into the through holes bored in the reel gear of the reel 2 so that the lower ends can abut a driving gear. The releasing member moves the restraining member in a releasing direction by moving according to the chucking operation of drive-side rotation drive means. In this manner, reel-rotation restraining means allows rotation of the reel when being used and restricts the rotation when not being used. In this construction, each of the through holes is bored between the tooth edges of the reel gear so that the releasing member can perform a reliable releasing operation.

Abstract: In a disk unit for recording and reproducing information to and from a disk-like recording medium, a disk loading device includes a slot into which a disk-like recording medium is inserted; a retaining member that retains the disk-like recording medium inserted from the slot; a moving member that moves the retaining member so as to retract the disk-like recording medium in a disk insert direction during insertion and expel the disk-like recording medium in a disk eject direction during ejection; a drive mechanism that drives the moving member in the insert direction and the eject direction; and a manual drive member that, when pressed, slidingly engages the drive mechanism and drives the drive mechanism in the eject direction.

Abstract: A resonance removing mechanism for a CD-RW drive is provided. The mechanism includes a first holding-down plate on which a read/write head is installed through two sliding rods. The first holding-down plate connects to a chassis frame through a series of first elastic pads, and a second holding-down plate is connected in parallel to the first holding-down plate through a series of second elastic pads. Active components are installed on the first holding-down plate and the second holding-down plate.

Abstract: A perpendicular magnetic recording head includes a write pole designed to reduce or eliminate problems caused by stray magnetic fields. By positioning a write coil close to the air bearing surface of the recording head, and controlling the geometry of the write pole, the necessity of a return pole to provide a closed magnetic flux path through the write pole and the magnetic recording media is eliminated. The use of an open magnetic path produced by a single write pole reduces or eliminates problems caused by stray magnetic fields which, in conventional perpendicular magnetic recording head designs, travel through the soft magnetic underlayer of the recording media and enter the recording head through the return pole.

Abstract: A dual spin valve read head includes first and second spin valve stacks configured to operate in a current perpendicular to plane (CPP) mode. The first and the second spin valve stacks each include a free layer. A spacer is positioned adjacent the free layers of the first and the second spin valve stacks and spaces the first spin valve stack apart from the second spin valve stack.

Abstract: An MR thin-film magnetic head includes a lower shield layer, an upper shield layer, a MR multilayer sandwiched between the lower shield layer and the upper shield layer, the MR multilayer being electrically connected with the lower shield layer and the upper shield layer, a current flowing through the MR multilayer in a direction perpendicular to surfaces of layers, and a lead conductor having one end electrically connected to the upper shield layer and the other end connected to a terminal electrode. The lead conductor is patterned such that an area of said lead conductor located above said lower shield layer becomes small.

Abstract: A thin-film magnetic head with an MR element, includes an MR film, under films each having a multilayer structure with a first under layer and a second under layer laminated on the first under layer, and magnetic domain control films joined to side end faces of the MR film through the under films.

Abstract: The optical disk apparatus is provided with a radiation shielding potion 3 including a horizontal section 31 in parallel to a bottom plate 73, and vertical sections 35, 35 which extend downwardly from both ends of the horizontal section, and provided in the vicinity of a front panel 4 to cross over a disk read section 2 equipped with a pickup 11. Further, each of the horizontal section 31 and the vertical sections 35, 35 is first shielding planes 33, 33, 37—37 in parallel to the front panel 4 and second shielding planes 32, 36, 36 perpendicular to the front panel. The vertical sections 35, 35 are secured to the bottom plate 73 at their lower ends.

Abstract: The invention relates to a spindle motor, in particular for driving a hard disk drive, with a stator, a rotor and a shaft disposed between stator and rotor, which supports at least one roller bearing, which comprises an inner and an outer bearing ring with roller bodies disposed between them. According to the invention the spindle motor comprises a device for the temperature compensation. In a first embodiment the invention is distinguished thereby that at least one equilibration element is provided which acts onto the outer and/or inner bearing ring, [which element is] disposed between the corresponding bearing ring and a part supporting the bearing ring, and has a specified coefficient of thermal expansion &agr;. In a second embodiment the shaft is used as equilibration element, wherein the shaft comprises a material with a low coefficient of thermal expansion &agr;.

Abstract: In a magnetic tape cartridge comprising a thin cartridge casing having flat upper and lower surfaces and a single reel which is housed in the cartridge casing for rotation and around which a magnetic tape is wound, island-like or point-like projections are provided at least three places of the lower surfaces of the cartridge casing near the leading edge and the trailing edge of the cartridge casing as viewed in the direction X of insertion of the magnetic tape cartridge in a recording and reproducing apparatus and recesses which are adapted to be engaged with the projections are provided on the upper surface of the cartridge casing so that, when a plurality of the magnetic tape cartridges are stacked, the projections and the recesses of the cartridge casings of magnetic tape cartridges which are just above and below each other are engaged with each other, whereby the magnetic tape cartridges are prevented from being displaced with respect to each other when a plurality of magnetic tape cartridges are stacked