Class 360/234.1 - Liquid bearing

Subclass of Class 360 - Dynamic magnetic information storage or retrieval
Definition: Subject matter wherein the fluid bearing is a liquid
No. of patents: 38
Last issue date: 04/22/2008

Number	Title	Issue Date
7362544	Thin film magnetic head slider, magnetic head support mechanism, magnetic disk drive, and method of manufacturing magnetic head A thermal flying height adjustment slider capable of being mounted on a small-sized thin film magnetic head slider is provided wherein terminals of an energizer serving as a heater prevent corrosion of pole pieces and the number of terminals is reduced. In one embod...	04/22/2008
7350400	Test method to measure lubricant mobility on a hard drive disk A method for measuring the mobility of a lubricant located on the top surface of a disk used in hard disk drives. The method includes forming one or more scribe lines in a lubricant layer of the disk. The disk is then spun by a spin stand where lubricant moves in re...	04/01/2008
7146710	Two stage lubrication process for disk drive A method for creating a hard drive includes installing a slider in a disk drive having at least one disk lubricated with a first stage lubricant. The slider is designed to be in contact with the disk at initial use. The slider is burnished. A second stage lubricant ...	12/12/2006
7114239	Method for manufacturing a thin-film magnetic head wafer A thin-film magnetic head wafer includes a first principal surface and a second principal surface which are substantially parallel to each other. An electrical/magnetic transducer is provided on the first principal surface. Identification information is recorded on ...	10/03/2006
7111386	Lead plating method for GMR head manufacture A major problem in Lead Overlay design for GMR structures is that the magnetic read track width is wider than the physical read track width. This is due to high interfacial resistance between the leads and the GMR layer which is an unavoidable side effect of prior a...	09/26/2006
7029590	Self-limiting wear contact pad slider and method for making the same The present invention provides a non-actuatable, self-limiting wear contact pad slider and method for making the same. A protruding element surrounding the transducer is fabricated using a third etch step so that the protruding element has a height that is greater t...	04/18/2006
6985324	Counteracting gas ingestion in a hydrodynamic bearing spindle motor According to one embodiment of the present invention, a method of counteracting gas ingestion in a hydrodynamic bearing of a spindle motor in a data storage device comprises waiting for activity of a host connected with the data storage device to become idle. When t...	01/10/2006
6973712	Lead plating method for GMR head manufacture A major problem in Lead Overlay design for GMR structures is that the magnetic read track width is wider than the physical read track width. This is due to high interfacial resistance between the leads and the GMR layer which is an unavoidable side effect of prior a...	12/13/2005
6937439	Slider having a textured air bearing surface, head stack assembly and disk drive using same A disk drive includes a disk having a recording surface and a head stack assembly. The head stack assembly includes a body portion that includes a bore defining a pivot axis, an actuator arm cantilevered from the body portion and a head gimbal assembly supported at ...	08/30/2005
6930849	Disk drive unit, controller for actuator, and method for controlling hard disk drive and disk drive unit In a hard disk drive where data is read from and written to a magnetic disk by a magnetic head in accordance with a command from a host computer, a moving distance of the magnetic head in a radial direction is detected within a predetermined period of time. The magn...	08/16/2005
6917495	Magnetic disk drive A magnetic disk drive having a magnetic disk, a spindle motor for rotating the magnetic disk, a magnetic head slider for recording or reproducing data onto or from the magnetic disk and a housing. A control circuit system is provided for controlling the head slider ...	07/12/2005
6912772	Method for shaping pole pieces of magnetic heads by chemical mechanical polishing A process for forming the P2 pole tip/yoke interface of a magnetic head that includes a second CMP polishing step that is performed on the surface of the write head wafer subsequent to the plating of the P2 pole tip thereon, and subsequent to a first C...	07/05/2005
6829818	Manufacturing method of a head gimbal assembly A magnetic head slider with at least one thin-film magnetic head element on a suspension is mounted. This mounting includes electrically connecting the magnetic head slider with the suspension with ball bonding connections. Electrical property of the thin-film magne...	12/14/2004
6665147	Magnetic disk drive with supply of perfluoropolyether as lubricant A magnetic disk drive having a small decrease in lubricant film thickness on the surface of the magnetic disk and a superior sliding reliability between the magnetic head and the magnetic disk surface. Perfluoropolyether is supplied as the lubricant onto ...	12/16/2003
6373658	Optimum location for slider landing pads A disk drive system or information handling system includes a base, a disk stack rotatably attached to the base, and an actuator assembly movably attached to the base. An actuator assembly is movably attached to the base of the disk drive. The actuator as...	04/16/2002
6212042	Slider having air bearing surface which includes pads for disk storage system A disc storage system includes a rotating disc and a transducer. The transducer is carried on a slider which is supported by an armature. The armature is used to move the slider radially across the disc surface whereby information may be read from or writ...	04/03/2001
6122143	Wet rigid disk drive assembly with a conical spindle bearing The invention concerns a disk drive assembly in which one or more rotating rigid disks are enclosed in a "wet" operating environment in which a liquid lubricant is circulated from the surface of the rotating disks, through a wicking material within the di...	09/19/2000
6118617	Magnetic disk drive A magnetic disk drive using a magnetic disk covered with a film of liquid lubricant for obviating wear ascribable to the friction and contact of the magnetic disk with a magnetic head is disclosed. The circumferential edge of the disk and the side wall of...	09/12/2000
5889635	Magnetic head slider and magnetic disk apparatus for redistributing a lubricant A magnetic head slider includes a magnetic recording/reproducing element, a contact pad, and a groove. The magnetic recording/reproducing element moves relative to a magnetic disk medium while being in contact with it, thus recording/reproducing informati...	03/30/1999
5850317	Apparatus and method for near contact magnetic recording A rotating magnetic storage device is shown wherein the transducer and media are separated during operation by a thin film of low viscosity liquid lubricant that is recirculated from a reservoir within the head-media enclosure. Lubricant recirculation can...	12/15/1998
5835305	Magnetic disk apparatus employing liquid bearing type or physical contact type magnetic head slider A magnetic storage apparatus includes a substantially non-flexible magnetic recording medium, a magnetic head slider having a reading/writing element mounted therein and liquid lubricant provided on the surface of the magnetic recording medium. The liquid...	11/10/1998
5825591	Frictionally sliding head magnet disk apparatus The present invention relates to a magnetic disk unit of a high memory capacity wherein a magnetic head and a magnetic disk with a lubricant layer formed on the surface thereof are allowed to perform a relative motion in a mutually contacted state to writ...	10/20/1998
5801903	Contact recording slider for use in a lubricant containing information storage system The invention relates an improved slider with a controlled textured surface for information storage systems that use an incompressible fluid. Most preferably, the slider is a contact recording slider for a self-replenishment lubrication system for a disk ...	09/01/1998
5742449	Near contact magnetic recording using a liquid lubricant bearing to separate media and transducer A rotating magnetic storage device is shown wherein the transducer and media are separated during operation by a thin film of low viscosity liquid lubricant that is recirculated from a reservoir within the head-media enclosure. Lubricant recirculation can...	04/21/1998
5661618	Magnetic recording device having a improved slider The invention relates to an improved high performance magnetic recording device. The recording device comprises a magnetic recording disk, a slider having a transducer for reading or writing data on the disk, a motor operable to rotate the disk at speeds ...	08/26/1997
5659447	Magnetic slider design for precision wear-in Method, with structure, of production of precision head/disk interfaces for near contact recording in a low viscosity liquid lubricant film. Triangular shaped bearing pads in an assembled hard drive are brought to bear upon a rotating lubricated disk to d...	08/19/1997
5612838	Oxidation-stabilized hydrocarbon liquid bearings for lubricated disk drives In liquid disk drives, liquid bearing materials based on hydrocarbon liquids, halogenated liquids and mixtures thereof are used at the head-disk interface. Additives such as antioxidants and boundary layer lubricants may be incorporated to enhance oxidati...	03/18/1997
5541789	Magnetic recording apparatus with magnetic head on slider having applied load larger than buoyant force acting on slider so that gap between magnetic head and magnetic disk is smaller than total thickness of protective layer and lubricating layer on disk A magnetic recording device includes a magnetic disk for storing information, a magnetic head for writing and reading information relative to the magnetic disk, a device for rotating the magnetic disk relative to the magnetic head in such a manner that sp...	07/30/1996
5526204	Low drag liquid bearing recording head A read/write head for an information recording apparatus having a liquid bearing lubricant between a rotating storage medium and the read/write head is disclosed. The head is provided an actuator to position the read/write head over the rotating storage m...	06/11/1996
5499149	Slider with transverse ridge sections supporting air-bearing pads and disk drive incorporating the slider A data recording disk drive has an improved head-disk interface provided by a transducer carrier which is essentially a low-flying air-bearing slider that is also able to be in contact and near contact with the lubricant film on the disk. The slider has a...	03/12/1996
5285337	Liquid-bearing data recording disk file with transducer carrier having support struts A data recording disk file of the liquid-bearing type has an improved head-disk interface provided by a transducer carrier with new properties. The carrier supports a conventional head for reading and writing data to the disk. The carrier has an air-beari...	02/08/1994
5267104	Liquid-bearing data recording disk file with transducer carrier having rear ski pad at the head-disk interface A data recording disk file of the liquid-bearing type has an improved head-disk interface provided in by a transducer carrier with new properties. The carrier supports a conventional head for reading and writing data to the disk. The carrier has an air-be...	11/30/1993
5202803	Disk file with liquid film head-disk interface A disk file with substantially reduced head-disk spacing and corresponding improvement in recording performance uses a disk coated with a film of conventional high viscosity lubricant, a lubricant reservoir for replenishing the lubricant on the disk over ...	04/13/1993
5200867	Transducer carrier for disk file with liquid film head-disk interface A disk file with substantially reduced head-disk spacing and corresponding improvement in recording performance uses a disk coated with a film of conventional high viscosity lubricant, a lubricant reservoir for replenishing the lubricant on the disk over ...	04/06/1993
5193046	Information recording apparatus with a liquid bearing An information storage apparatus is disclosed for reading and/or writing information on a rigid storage medium which includes a liquid bearing interface between the transducer and medium instead of a conventional air bearing. The liquid is a fluorocarbon ...	03/09/1993
5097368	Information recording apparatus with a non-Newtonian liquid bearing An information storage apparatus is disclosed for reading and/or writing information on a rigid disk, which includes a non-Newtonian liquid bearing interface between a transducer and a storage medium, instead of a conventional air or Newtonian liquid bear...	03/17/1992
4633351	Method and apparatus for hydrodynamic magnetic recording Problems of wear and bounce created by imperfections in the surface of a magnetic recording medium, such as a chromium dioxide-coated drum, are circumvented by a hydrodynamic magnetographic imaging technique that provides the intended effective intimate c...	12/30/1986
4626941	Method and apparatus for suppressing the evaporation of lubricant film coated on magnetic disks of a disk storage A magnetic disk storage apparatus includes an air-tight enclosure containing a drive mechanism for rotating magnetic disks coated with a lubricant material and a flying head assembly. A lubricant evaporating source is arranged inside the enclosure and exp...	12/02/1986

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Class 360/234.1 - Liquid bearing