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公开(公告)号：JPS639002A
公开(公告)日：1988-01-14
申请号：JP9551787
申请日：1987-04-20
Applicant: IBM
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Patent Agency Ranking
公开(公告)号：JPH04229471A
公开(公告)日：1992-08-18
申请号：JP14425991
申请日：1991-04-18
Applicant: IBM
Abstract: PURPOSE: To prevent the disappearance of rerecorded data and the damage of a head, slider due to a head breaking by sensing the distance between a magnetic transducer and a moving magnetic recording medium. CONSTITUTION: The distance between a head 10 and a disk 9 is measured by sensing the width of the read back signal V(t) obtained by reading magnetic transitions which are written in the preliminarily selected area of the disk 9 with the head 10 by a prescribed amplitude level being the preselection rate of a base peak amplitude and by using a voltage Vref corresponding to the width of the read back signal.
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公开(公告)号：JPH06180803A
公开(公告)日：1994-06-28
申请号：JP20165493
申请日：1993-08-13
Applicant: IBM
Inventor： JIYON TOOMASU KONTOURERASU , SUTEIIBUN ARAN JIYOUBU , KURAASU BERENDO KURAASEN , JIEIKOBUSU KOONERISU REONARUDO
Abstract: PURPOSE: To provide a data storage device providing an amplifier circuit which amplifies and also biases a signal from a magnetoresistance detecting element. CONSTITUTION: The device is provided with magnetoresistance detecting elements R1 and Rn for detecting data from a storage medium which is connected with ground potential as reference and the amplifier circuit 10 adding a biasing stage A, an amplifying stage B and a matching stage C which are respectively connected with a common voltage source Vcc and ground potential Gnd as reference. Then, the biasing stage is provided with a refernece voltage source which biases the respective magnetioresistance elements by constant current and also generates a signal end-shape voltage signal having a first D.C. component by it. The single end-shape signal where the second D.C. component is provided but the first D.C. component is removed is converted into a single end-shape amplifying output signal in the amplifying stage. Moreover, the matching stage generates a bias, sets it in the amplifying stage and converts a single end-shape output voltage signal into as differential output voltage signal without the second D.C. component.
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公开(公告)号：JPH07210975A
公开(公告)日：1995-08-11
申请号：JP23470694
申请日：1994-09-29
Applicant: IBM
Inventor： KURISUTOFUAA EICHI BAJIYOREKU , TOOMASU DABURIYU GUREISAA , KURAASU BERENDO KURAASEN , CHIYAARUZU AARU NIIRUSEN , JIYOOJI AARU SANTANA , GOODON JIEEMUZU SUMISU , DEIBITSUDO AREN TONPUSON , MAIKERU RII UOOKUMAN
Abstract: PURPOSE: To apply timing for reducing power consumption in relation to the latest history of an access operation to a device by comparing average consumption energy with a previously decided consumption energy threshold and selecting an operation mode. CONSTITUTION: A disk driving device 20 receives power from a power source device 22 through a mode controller 24. The power from the device 22 is transferred to a consumption energy monitor device 28 through a line 26 and is transferred from the device 28 to the controller 24 through a line 30. The controller 24 distributes the power inputted through the line 30 to the device 20 through plural lines represented by a line 32. The device 28 gives the signal 34 of use energy to the consumption energy comparator 36 of fuzzy logic and compares average consumption energy with the consumption energy threshold. The comparator 36 generates a mode selection signal 38 based on the compared result and transfers the signal 38 to the controller 24 for making a necessary power consumption reduction mode. The controller 24 selects the operation mode in response to the signal 38.
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公开(公告)号：JPS6346617A
公开(公告)日：1988-02-27
申请号：JP11267487
申请日：1987-05-11
Applicant: IBM
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