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公开(公告)号：JPH10134492A
公开(公告)日：1998-05-22
申请号：JP14499397
申请日：1997-06-03
Applicant: IBM
Inventor： KASIRAJ PRAKASH , MEEKS STEVEN WAYNE , REILEY TIMOTHY CLARK
Abstract: PROBLEM TO BE SOLVED: To provide the magnetic recording disk drive equipped with a magneto-resistance(MR) read head for detecting external impact by utilizing a thermal resistance effect in an MR head signal and suppressing write-in operation. SOLUTION: The magnetic recording disk drive equipped with the MR read head 60 is equipped with an impact detecting circuit 55 for responding to a thermal resistance signal contained in the signal from the head. The MR head 60 is heated by a bias current, and is supported on a head carrier close to the surface of the disk 10. A space between the carrier 13 and the disk is changed by external impact upon the disk drive, and hence the heated head is cooled by, the disk, so that a head temp. is varied. Such a variation in the temp. is reflected as the thermal resistance signal including modulation of a base line voltage level to the signal from the head. Positive and negative deviation of this thermal resistance signal is compared with a prescribed threshold voltage level by the impact detecting circuit 55.
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公开(公告)号：JP2002074606A
公开(公告)日：2002-03-15
申请号：JP2001194639
申请日：2001-06-27
Applicant: IBM
Abstract: PROBLEM TO BE SOLVED: To provide a writing head for a heat support type magnetic recording system attaining a narrow track width. SOLUTION: A thin film inductive writing head includes an electric resistance heater 20 disposed in a writing gap WG between the extreme tips of the writing head. A resistance heater is inserted between first and second spacer layers I1 and I2 disposed between the extreme tips of the writing head. In CIP head, spacer layers are made of insulating materials, an electric lead is formed as a part of a film between the spacer layers, and brought into contact with each side of the resistance heater. The width WR of the resistance heater is smaller than the width W of the extreme tip. Thus, writing is carried out by the extreme tip of the writing head only in the area of a magnetic layer on the disk heated by the resistance heater. Thus, the width of a data track on the disk is defined not by the shape of the extreme tip of the writing head but by the width of the resistance heater.
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公开(公告)号：DE69722857D1
公开(公告)日：2003-07-24
申请号：DE69722857
申请日：1997-04-02
Applicant: IBM
Inventor： KASIRAJ PRAKASH , MEEKS STEVEN WAYNE , REILEY TIMOTHY CLARK
Abstract: A magnetic recording disk drive with a magnetoresistive (MR) read sensor or head has a shock and vibration detection circuitry responsive to a thermoresistive signal contained in the signal from the head. The MR head is heated by an electrical bias current and is supported on the head carrier near the surface of the disk. External shock or vibration to the disk drive alters the spacing between the carrier and the disk, which causes fluctuations in the head temperature due to cooling of the heated head by the disk. These temperature fluctuations are reflected in the signal from the head as a thermoresistive signal comprising modulation of a baseline voltage level. The shock detection circuitry compares positive and negative excursions of this thermoresistive signal with a predetermined threshold voltage level. When the threshold is exceeded, indicating an external shock or vibration in excess of an allowable limit, writing of data is inhibited.
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