International Business Machines Corporation

Verbatim Corporation

Other

George W Brock

Frank B Shelledy

Edward Joseph Pawlowski

Edward Mroz

Robert J Janning, Jr

Robert S Rogers

Armando Jesus Argumedo

Nelson K Arter

Ernest P Kollar

Robert N Hyland

Howard C Jackson

Richard F Thornley

Alfred W Conner

George J Hampton

Michael L Nettles

Arthur B Wills

Paul D Losee

M Andreas Grimm

Sidney H Smith

James Warren Leggate

Frederick W Hahn, Jr

Ricardo R Stone

A magnetic record disk assembly includes a floppy disk located within a rigid case having integral case stiffeners, wiping force appliers and floppy disk stabilizers. Wipers made of fabric, cleaning material are located within the case and disk flexure creates frictional force between the wipers and the disk. Thus, the wipers clean contaminants from the disk during rotation thereof within the case. A simple, automatic, cam-actuated shutter covers a transducer access slot in the case. This shutter is restrained by a detent to prevent undesired movement. A modified form of shutter has a compression spring that facilitates assembly of the shutter. A write protect device is located within the case. This device includes a piece that is mounted to rotate through an arc of 180.degree. in a plane perpendicular to a side surface of the case for opening and closing a sensing aperture within the case.

Write protect device for a record disk assembly

A magnetic record disk assembly includes a floppy disk located within a rigid case having integral case stiffeners, wiping force appliers and floppy disk stabilizers. Wipers made of fabric, cleaning material are located within the case and disk flexure creates frictional force between the wipers and the disk. Thus, the wipers clean contaminents from the disk during rotation thereof within the case. A simple, automatic, cam-actuated shutter covers a transducer access slot in the case. This shutter is restrained by a detent to prevent undesired movement. A modified form of shutter has a compression spring that facilitates assembly of the shutter. A write protect device is located within the case. This device includes a piece that is mounted to rotate through an arc of 180.degree. in a plane perpendicular to a side surface of the case for opening and closing a sensing aperture within the case.

Magnetic record disk cleaning and stabilizing assembly

A flexible magnetic recording media, such as disks or magnetic tape, having a non-magnetic layer intermediate the substrate and magnetic recording layers providing improved durability of the magnetic recording layer including a binder comprised of non-magnetic particles of .alpha.Fe.sub.2 O.sub.3 with similar physical properties as those of the magnetic recording layer (.gamma.Fe.sub.2 O.sub.3 or Co-.gamma.Fe.sub.2 O.sub.3) and a reservoir of lubricant.

Wear resisting undercoat for thin film magnetic recording media

A process for forming a magnetic recording member composed of a substrate, a magnetic film, and a protective layer. The magnetic film is deposited on the substrate by means of DC or RF sputtering and electron beam vacuum deposition in a partial pressure of inert gas. During the final minutes of the sputter process, oxygen or carbon monoxide is injected into the vacuum chamber to form the protective layer.

Process for creating wear and corrosion resistant film for magnetic

An improved magnetic flexible disk for use in data storage is provided with a stabilized locating ring about the spindle aperture thereof. The stabilized locating ring is selected from an electrically conductive material having miniscule humidital expansion characteristics at normal use temperatures. The stabilized locating ring has an inside diameter precisely equal to the outside diameter of the drive spindle on the disk drive apparatus for which the disk is designed to be utilized. The locating ring is bonded onto an existing disk which has had its central aperture punched to be slightly oversized. The improved disk is characterized by its longer usable lifetime, substantially elimination of errors in registration and increased data capacity.

Stabilized locating ring for a flexible disk

A magnetic head assembly useful as a write head is formed with a ferrite substrate, having a recessed channel on one surface in which a conductive coil is deposited, and a ferrite closure having a planar surface that is joined to the substrate surface to establish a transducing gap and to enclose the recessed coil. In operation, pulsed write current is applied to the write head and a significant reduction in Joule heating is realized. A low resistance substrate is employed to provide a high saturation flux density.

Magnetic head assembly

A magnetic head assembly includes a ferrite core sandwiched between two ceramic layers. Alumina films are deposited by sputtering on the sides of the ferrite core and on the ceramic layers in one structure, and on the ferrite core only in another structure, which are then bonded to form an integral head assembly. Slots to provide flying height control are formed in the air bearing surface of the ceramic layers. The process of making the assembly includes the steps of sputter etching the ferrite and ceramic prior to the deposition of the alumina.

Magnetic head assembly with ferrite core

Signal peaks are identified by measuring the slopes on each side of a signal peak. Each slope measurement is linearized to ascertain a slope angle. Both linearized portions and slope angles are compared to find an intersection of the linearized portions. Such intersection identifies the location of a single peak. The measurement method is particularly useful for detection of peaks in signals with low signal to noise ratios. A programmed digital computer may be used in the measurement method.

Signal recovery method and apparatus

Write windings are deposited on a ferrite half yoke mounted on a titanium body, and magnetoresistive elements are deposited on another ferrite half yoke mounted on another titanium body. A center section comprising a sandwich of silver-copper shielding material between two ferrite sheets has glass-filled slots cut on one side thereof. The center shield is placed between the write and read sides with the write windings placed between pairs of glass-filled slots and with the magnetoresistive elements in contact with the opposite surface of the center shield. The write windings and the magnetoresistive elements are connected to connector blocks prior to final assembly, and the write and read sides and the center section are pressured together by bolts through two end pieces, forming a vise-like structure.

Process for making a read-while-write tape head and the product made

A magnetic transducer exhibiting the magnetoresistive (MR) effect is made by depositing at least two thin film layers. An MR film placed in electrical contact with a higher resistivity layer is magnetically biased by a portion of the MR sense current shunted through the nonmagnetic layer.

Method for manufacturing and using an internally biased magnetoresistive

A rotating head magnetic tape transport wherein a helical wrap of flexible magnetic tape is formed about a stationary tubular mandrel and a rotatable headwheel which carries a slotted head of generally spherical flying contour. This rotating head includes a generally spherical surface profile to insure that the head flies with close microinch adjacency to a length of magnetic recording tape. The head's spherical profile includes two parallel airflow slots which extend in the direction of head movement. A uniform, stable, hydrodynamic air film is developed over a relatively large area, generally centered on the head's transducing gap.

Magnetic tape transport with slotted rotating head

Parallelism between the track on magnetic tape and the path of the rotating head is dynamically adjusted and maintained by adjusting one or both of the entry or exit guides guiding the tape as it helically wraps a mandrel. The mandrel has two halves that flank the rotating head so that as the tape wraps the mandrel, the rotating head traverses the tape at an oblique angle. Skew error is represented by a lack of parallelism between the track on the tape and the path of the rotating head across the tape. The skew error may be corrected by laterally shifting either the entry or exit tape edge guide without distorting the track over a limited lateral range of movement by the guides. The entry and exit edge guides are continuouscompliant air-bearing guides. Similarly, the mandrel that supports the tape adjacent the rotating head is also air bearing.

Dynamic skew correction for rotating head magnetic recorder

A magnetoresistive (MR) layer is placed offcenter the distance between two shields to enhance self-biasing. Information is carried on a magnetizable medium as recorded magnetic areas. The shields are spaced apart by a distance on the order of and less than the shortest recorded wavelength for which the head is meant to be used. The MR element and the shields have their edges nearest the medium in a common plane perpendicular to the vertical component of a signal from the recorded area. An additional shunt bias layer may be provided immediately adjacent and coextensive the MR element, and the head may serve one or many tracks.

Shielded magnetoresistive magnetic transducer

A track or stripe tape positioner for a helical scan or rotary head recorder uses digital techniques. The expected step size is preset into a counter. During the next phase, a calibration phase, the tape is stepped through a plurality of stripes whereat the preset value is adjusted to measured values. In the third phase, the average step size is maintained subject to certain averaged changes thus providing a high degree of noise rejection to ensure reliable incremental stepping of a record tape through the recorder.

Growing community of inventors

Los Altos Hills, CA, United States of America

George W Brock