公开(公告)号：DE3680463D1

公开(公告)日：1991-08-29

申请号：DE3680463

申请日：1986-08-05

Applicant: IBM

Inventor： CROUSE WILLIAM GEORGE ,  CUNNINGHAM EARL ALBERT ,  VINAL ALBERT WATSON

IPC: G11B5/58 ,  G11B5/596 ,  G11B21/10

公开(公告)号：DE3674713D1

公开(公告)日：1990-11-08

申请号：DE3674713

申请日：1986-07-22

Applicant: IBM

Inventor： VINAL ALBERT WATSON

IPC: G11B5/31 ,  G11B5/127 ,  G11B5/39

公开(公告)号：DE3674706D1

公开(公告)日：1990-11-08

申请号：DE3674706

申请日：1986-07-22

Applicant: IBM

Inventor： VINAL ALBERT WATSON

IPC: G11B5/127 ,  G11B5/33 ,  G11B5/39

Abstract: It is disclosed a twin track read/write head structure that is differential in its response, thereby eliminating common mode noise signals. The structure utilizes a dual coupled film magneto resistive sensor (1A,1B) bridging the legs (4A,4B) of two magnetically permeable coupling members so that the dual magnetic sensors (1A,1B) are in a series magnetic circuit with the coupling members (4A,4B). The dual coupled film magnetic sensors (1A,1B) are connected together in a center tapped arrangement and are oppositely magnetically biased. Opposing voltages changes occur when the pair are subjected to a magnetic flux field passing serially through them. This produces a differential output signal that rejects unwanted common mode noise of all types. In addition, during read back when the sensors (1A,1B) are biased by a magnetic flux field into their sensitive range, the balanced differential structure of the head presents equal magneto motive forces at both ends of the sensor (1A,1B) where they connect to the flux coupling legs (4A,4B). As a consequence, there is no net flux available at the other ends of the coupling legs and no flux is coupled to the media.

公开(公告)号：BR8500630A

公开(公告)日：1985-10-01

申请号：BR8500630

申请日：1985-02-12

Applicant: IBM

Inventor： VINAL ALBERT WATSON

IPC: G11B5/127 ,  G11B5/33 ,  G11B5/39 ,  G11B19/04

Abstract: 57 An improved read-write head for twin track vertical magnetic recording is described. Inductive, solid state, or magneto-resistive sensors may all be employed with the new read-write head structure. A preferred embodiment utilizing a magneto-resistive coupled film sensor for read back which saturates to allow writing is disclosed.

公开(公告)号：DE2961205D1

公开(公告)日：1982-01-14

申请号：DE2961205

申请日：1979-04-06

Applicant: IBM

Inventor： VINAL ALBERT WATSON

IPC: H01L29/78 ,  G01R33/06 ,  H01L29/82 ,  H01L43/06 ,  H01L29/10 ,  G01R33/02

Abstract: A high sensitivity, low noise, broad bandwidth, twin channel conduction Lorentz channel coupled semiconductive field sensor device is described. The conductive channels are configured to create exceptionally narrow, undepleted conduction zones of approximately filamentary form. The filamentary conductive channels so formed are provided with a common source at one end of each channel and a separate drain at the other end thereof. The independent drains are spaced apart by a narrow area of semiconductive material. Magnetic fields may be utilized to create a Lorentz voltage in a region between the two conductive channels to vary the amount of current received at the two drains by utilizing the depletion width modulation effects of the Lorentz voltage upon the boundaries defining the conductive channel portions. Modulation of the depletion zone widths and depths along the channel sides effectively move the streams of carriers and the conductive channel areas to conduct more current to one drain more than another. This develops a differential drain current balance which can be utilized to provide an output signal. Width and length criteria for defining the filamentary channel structures are described for the ultimate desired configuration and size which are to be obtained. As noted, operation of the device is based upon Lorentz voltage modulation of the width and depth of the depletion zone boundaries defining the conductive channel. The Lorentz voltage is created in an area of semiconductive material coupling the two filamentary channels. An increased signal output is obtained by reducing the width of the filamentary channels to eliminate excess carriers normally found in wide channel devices and, further, by making the depletion zones as large a portion of the total channel widths as can be obtained.

公开(公告)号：DE2960810D1

公开(公告)日：1981-12-03

申请号：DE2960810

申请日：1979-05-07

Applicant: IBM

Inventor： VINAL ALBERT WATSON

IPC: H01L29/73 ,  G01R33/06 ,  H01L21/331 ,  H01L29/10 ,  H01L29/68 ,  H01L29/82 ,  H01L29/868 ,  H01L43/00 ,  H01L43/02 ,  H01L43/06 ,  H01L29/90

Abstract: A heretofore undiscovered suddenly conducting avalanche voltage effect is described with relationship to a new family of hybrid transistors. The devices constructed also exhibit magnetic sensitivity. The magnetic responsiveness of such devices creates a new family of magnetic sensors which utilize magnetic modulation of the avalanche voltage produced by the new effect. New transistor structure elements are incorporated in the devices. These include an impact ionization promoter means and an intrinsic, or high resistivity, depleted base region which extends at least partially from a collector toward an emitter. Minority carrier injection efficiency control means and transportation efficiency control means are also included. The character of the base region extending between the emissive junction and the collector is carefully controlled so that the product of the ionization current multiplication factor M and an electron-hole recombination probability factor alpha is less than unity. Within limits, any specifically desired avalanche voltage can be created by controlling the characteristics of the transistor structure. This voltage may then be varied bidirectionally by magnetic fields to form a new class of magnetic sensors.

公开(公告)号：DE2617481A1

公开(公告)日：1976-11-25

申请号：DE2617481

申请日：1976-04-22

Applicant: IBM

Inventor： VINAL ALBERT WATSON

IPC: G01R33/07 ,  H01L27/22 ,  H01L43/06

Abstract: A semi-conductive magnetic flux sensor is disclosed in which semi-conductive material having a resistance on the order of at least 500 ohms per square is placed in a lateral electric field of at least 500 volts per centimeter. A signal probe or contact located between the two lateral field contacts produces an output voltage when the sensor is subjected to magnetic fields having at least some component perpendicular to the plane of the three contacts. The device is highly sensitive and yields approximately one order of magnitude higher signal output than conventional Hall type semi-conductive magnetic sensors.

公开(公告)号：DE2425183A1

公开(公告)日：1975-01-02

申请号：DE2425183

申请日：1974-05-24

Applicant: IBM

Inventor： STILLINGS WARNER EVERETT ,  VINAL ALBERT WATSON

IPC: G06F3/02 ,  G01R33/00 ,  G01R33/02 ,  H01H13/00 ,  H01H36/00 ,  H03K17/972 ,  H03K17/90

公开(公告)号：DE2330730A1

公开(公告)日：1974-01-10

申请号：DE2330730

申请日：1973-06-16

Applicant: IBM

Inventor： VINAL ALBERT WATSON

IPC: G06F3/02 ,  H01H13/12 ,  H01H13/20 ,  H03K17/90 ,  H01H3/12

Abstract: A key mechanism has co-axial permanent magnets as a biasing means for key operator and co-axial permanent magnets operable to cause snap action operation of a cylindrical cup within a housing. The co-axial biasing magnets are magnetized in parallel to their common axis and have a polarity of opposite direction. The actuator permanent magnets are magnetized in parallel with their common axis and have a polarity in the same direction. The force-displacement characteristic of the biasing magnets is matched to the force-displacement characteristic of the actuator magnets to provide a predetermined tactile force-displacement characteristic for the operator.

公开(公告)号：DE3586676D1

公开(公告)日：1992-10-29

申请号：DE3586676

申请日：1985-10-15

Applicant: IBM

Inventor： VINAL ALBERT WATSON

IPC: G11B5/596 ,  G11B5/02 ,  G11B5/33 ,  G11B5/58 ,  G11B21/10

Abstract: Servoing is accomplished utilizing the same read head and the same data track by utilizing a differentially sensitive magnetic sensor. The sensor is utilized as the data read back head sensitive element but separate outputs from the differential sensor are supplied to separate track following amplifiers isolated from the data signal amplifier. The separate amplifiers for the servo information utilize the inherent differential sensitivity of the sensor. As one-half or the other of the differentially sensitive sensor drifts over the edge of a recorded data track, its signal output level will follow. This differential between the left and right halves of the sensor in the form of a change in signal level at the output can be amplified, referenced to common ground for high common mode noise rejection, and a differential signal derived from the difference between the left and right halves of the sensor. The differential is proportional to the distance off track that the sensor has wandered provided that at least a portion of the sensor remains over the track. A servoing system utilizing the differential output between the left and right and driven by the magnitude of the difference between left and right half signal components is utilized to force the head positioning system back in the appropriate direction to center the head over the data channel.