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1. 发明专利

JPH05210933A SUBSTRATE FOR PRODUCTION OF SLIDER 失效
公开(公告)号：JPH05210933A
公开(公告)日：1993-08-20
申请号：JP1613192
申请日：1992-01-31
申请人： HITACHI LTD , HITACHI METALS LTD
发明人： MUNEMOTO TAKAYUKI , FUTAMOTO MASAAKI , TAKANO KOJI , NISHIYAMA SHUNICHI , NOGUCHI KAZUMI , SADAMURA SHIGERU , WATANABE JUNICHI
IPC分类号： G11B21/10 , G11B21/21
摘要： PURPOSE:To obtain the substrate suitable for production of a slider having a piezoelectric type actuator by alternately laminating layers of piezoelectric elements and layers of conductive materials, thereby constituting the substrate. CONSTITUTION:The substrate base material 1 is formed by alternately laminating the piezoelectric materials 2 and the conductive materials 3. This base material 1 is cut out in the direction perpendicular to the lamination plane and the substrate 1a is cut out in the direction parallel with the lamination, by which the substrate 1b is obtd. Plural magnetic heads corresponding to the plural slider components are formable by a thin film forming process vertically and horizontally respectively on the plate surfaces alpha, beta of these substrates 1a, 1b. Then, the sliders provided with the means for positioning the magnetic heads with the piezoelectric elements are easily produced.

2. 发明专利

DE69128056D1 未知
公开(公告)号：DE69128056D1
公开(公告)日：1997-12-04
申请号：DE69128056
申请日：1991-08-06
申请人： HITACHI LTD
发明人： MATSUDA YOSHIBUMI , FUTAMOTO MASAAKI , MIYAMURA YOSHINORI , TAKAGAKI TOKUHO , TAKANO HISASHI , KUGIYA FUMIO , NAKAO TAKESHI , AKAGI KYO , SUZUKI MIKIO , FUKUOKA HIROTSUGU , MUNEMOTO TAKAYUKI
IPC分类号： G11B5/64 , G11B5/65 , G11B5/66 , G11B5/73 , G11B5/738 , G11B5/85 , G11B5/851 , G11B5/716
摘要： In a magnetic recording medium, both the saturation induction and the coercive force of a magnetic film increase towards a surface of the recording medium. Information can be recorded with a linear recording density higher than 50 kFCI even with a spacing around 0.2 mu m.

3. 发明专利

DE69128056T2 未知
公开(公告)号：DE69128056T2
公开(公告)日：1998-05-20
申请号：DE69128056
申请日：1991-08-06
申请人： HITACHI LTD
发明人： MATSUDA YOSHIBUMI , FUTAMOTO MASAAKI , MIYAMURA YOSHINORI , TAKAGAKI TOKUHO , TAKANO HISASHI , KUGIYA FUMIO , NAKAO TAKESHI , AKAGI KYO , SUZUKI MIKIO , FUKUOKA HIROTSUGU , MUNEMOTO TAKAYUKI
IPC分类号： G11B5/64 , G11B5/65 , G11B5/66 , G11B5/73 , G11B5/738 , G11B5/85 , G11B5/851 , G11B5/716
摘要： In a magnetic recording medium, both the saturation induction and the coercive force of a magnetic film increase towards a surface of the recording medium. Information can be recorded with a linear recording density higher than 50 kFCI even with a spacing around 0.2 mu m.

4. 发明专利

JPH06103663A TAPE LOADING DEVICE 失效
公开(公告)号：JPH06103663A
公开(公告)日：1994-04-15
申请号：JP24956692
申请日：1992-09-18
申请人： HITACHI LTD
发明人： ISHII TOMOKAZU , TAKEDA FUMIO , TAJIMA FUJIO , SAKAI KAZUO , OKUYAMA HIROYOSHI , MUNEMOTO TAKAYUKI , FURUHATA SHIGEYUKI
IPC分类号： G11B15/67
摘要： PURPOSE:To allow a tape to pass on the three-dimensional tape running course extended in the height direction. CONSTITUTION:A tape inserting arm 9 is rotated to draw out the tape after a pin 20 at the tip and a guide block 7 at the start edge of tape are connected. This arm forms a panta-arm mechanism, and its movement in the planar direction is decided by a cam groove 18. The movement of this arm in the vertical direction is decided by an end face cam with which a part of the arm is brought into contact. Tape guide members 10, 11 which are formed as movable, are moved to wind the tape around a rotary drum 5, after the guide block 7 connected to the tip of the tape inserting arm 9 is passed through the neighborhood of these tape guide members 10, 11.

5. 发明专利

JPH0628800A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH0628800A
公开(公告)日：1994-02-04
申请号：JP17967192
申请日：1992-07-07
申请人： HITACHI LTD
发明人： GOTOU MARUTOMO , YOSHIDA TAKASHI , MUNEMOTO TAKAYUKI , MATSUDA YASUHIRO
IPC分类号： G11B21/21
摘要： PURPOSE:To reduce head positioning errors caused by head attaching errors by calculating a dislocation amount between a recording head and a reproducing head, detecting the head gap width center dislocation of both heads and a head track width center disslocation and compensating a head position decision. CONSTITUTION:The data signal of signals read by a reproducing head 10 via a switch 19 is inputted to a reproducing circuit 15 and the servo signal of signals read by the head 10 via a switch 9 is inputted to a servo control circuit 18. The dislocation amount d1 against the central line of the width of the track T1 of the reproducing head 10 on one track T1 and the dislocation amount d2 of the head 10 on the other track T2 are detected by a circuit 15 based on the data signal. The track T1 direction dimension (a) and a shift (b) in the dimension of the width direction of a recording head 9 and the reproducing head 10 are calculated from the amounts d1 and d2 by an arithmetic circuit 6 and by these values, the head positioning is compensated.

6. 发明专利

JPH03187018A MAGNETIC RECORDING MEDIUM AND ITS PRODUCTION 失效
公开(公告)号：JPH03187018A
公开(公告)日：1991-08-15
申请号：JP32387289
申请日：1989-12-15
申请人： HITACHI LTD
发明人： MIYAMURA YOSHINORI , FUTAMOTO MASAAKI , MATSUDA YOSHIFUMI , TAKANO KOJI , KUGIYA FUMIO , AKAGI KYO , SUZUKI MIKIO , NAKAO TAKESHI , HASEGAWA NORIO , FUKUOKA HIROTSUGU , MUNEMOTO TAKAYUKI , TAKAGAKI ATSUSUKE
IPC分类号： G11B5/82 , G11B5/73 , G11B5/84
摘要： PURPOSE:To easily form guide grooves by carrying out exposure while rotating the substrate through a mask having apertures on a photoresist layer formed on a recording film, forming the rugged pattern with the development and using this pattern as a mask to form guide grooves. CONSTITUTION:A magnetic recording layer 2 composed of CoCr is formed by sputtering on an Al substrate 1, on which photoresist is applied by spin coating. A mask 21 having apertures 22 is arranged on the substrate 1 and then the coating film is exposed to light while the substrate 1 (or mask 21) is rotated. By developing the film, photoresist on the area corresponding to the guide grooves 3 is removed and the recording film 2 is exposed. The exposed film 2 is then etched by ion milling to form the guide grooves 3, and thereby, a magnetic recording medium 4 having guide grooves 3 can be obtained.

7. 发明专利

JPH02267782A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH02267782A
公开(公告)日：1990-11-01
申请号：JP8890589
申请日：1989-04-07
申请人： HITACHI LTD
发明人： YAMAGUCHI YUZO , MUNEMOTO TAKAYUKI
IPC分类号： G11B21/08 , G11B5/55 , G11B21/10
摘要： PURPOSE:To realize a high-speed seek action in the seek of a short distance by permitting the mechanism to execute the seek action at a high speed when a remaining seek distance is made within the stroke range of the second transducer access mechanism of a high-speed small stroke. CONSTITUTION:A seek distance discriminating circuit 23 compares the seek capable distance of a second transducer access mechanism (SAM) with a necessary seek distance sent from a seek distance calculating circuit 21 at the time of starting the seek and with the remaining seek distance sent from a subtracter 22 after the seek is started, a positive signal and a negative signal are sent to an access mechanism switching circuit 24 when the seek capable distance of the SAM is large and small, respectively, and a changeover to a second circuit side and to a first circuit side is executed when he signal is positive and negative, respectively. When the output signal of the seek discriminating circuit 23 is positive, namely, when the remaining seek distance is smaller than the seek capable distance of the SAM, a connection through the secondary side second circuit of the circuit 24 to a twenty-first circuit of a seek/following switching circuit 32 is executed, and a control circuit 30 execute the seek action with the second actuator of the high-speed small stroke based on position information.

8. 发明专利

JPH06325444A DETECTION OF SPEED OF MAGNETIC TAPE 失效
公开(公告)号：JPH06325444A
公开(公告)日：1994-11-25
申请号：JP11270893
申请日：1993-05-14
申请人： HITACHI LTD
发明人： MUNEMOTO TAKAYUKI , SAKAI KAZUO , TAJIMA FUJIO
IPC分类号： G11B15/52
摘要： PURPOSE:To realize stable travel control by directly detecting the travelling speed of the medium of a magnetic recording and reproducing device. CONSTITUTION:The signals generated by a signal generating means 10 are recorded on a magnetic tape 7 by a recording head 8. The wavelengths of the recorded signals are determined by tape speeds and the amplitude of the signals generated by a head 11 for reproduction generate a change by the loss depending on the wavelengths. The amplitude at this time is detected by an amplitude detecting means 13 and is changed to the travelling speed of the tape by an amplitude/speed changing means 14.

9. 发明专利

JPH04368676A ACCESS SERVO MECHANISM FOR MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH04368676A
公开(公告)日：1992-12-21
申请号：JP14452991
申请日：1991-06-17
申请人： HITACHI LTD
发明人： OTSUKI HARUAKI , MUNEMOTO TAKAYUKI , MORI KENJI
IPC分类号： G11B7/085 , G11B21/08 , G11B21/10
摘要： PURPOSE:To obtain an access servo mechanism with high response ability by cooperating effectively a driving means with high responsiveness but a small stroke and the driving means with a large stroke but lower responsiveness than the driving means in particular, concerning with the access servo system of a magnetic disk device. CONSTITUTION:The deviation of the displacing amount (y) of a head to the target position (r) of the head is defined as the deviation signal of the both of a first and a second driving means G1(S), G2(S). Simultaneously, the displacing amount of the first driving means G1(S) is added as the target signal of the second driving means G2(S).

10. 发明专利

JPH03245315A HEAD SLIDER 失效
公开(公告)号：JPH03245315A
公开(公告)日：1991-10-31
申请号：JP4102790
申请日：1990-02-23
申请人： HITACHI LTD
发明人： MUNEMOTO TAKAYUKI , YAMAGUCHI YUZO , AKAGI KYO , NAKAO TAKESHI , KUGIYA FUMIO , SUZUKI MIKIO , FUTAMOTO MASAAKI , MIYAMURA YOSHINORI , MATSUDA YOSHIFUMI , TAKANO KOJI , FUKUOKA HIROTSUGU , TAKAGAKI TOKUSUKE
IPC分类号： G11B5/60 , G11B21/21
摘要： PURPOSE:To allow the positioning of the head slider at a high speed with high accuracy by changing transducers in a positioning direction (track width direction) by the driving member provided on the head slider. CONSTITUTION:A piezoelectric element which changes its position largely in the direction perpendicular to a positioning direction is used as the driving member 4 and further, a converting mechanism 5 which converts the change in the size of the piezoelectric element to the displacement quantity of a transducer 6 in the positioning direction is provided on the slider 1. Namely, the converting mechanism 5 converts the displacement quantity of the driving member 4 generated in the transducers 6 in the direction perpendicular to the positioning direction (track width direction) to the displacement quantity in the positioning direction of the transducers 6, thereby allowing the increase in the degree of freedom with the formation of the driving member 4. The positioning is executed at high speed with high accuracy in this way.

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