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公开(公告)号：DE69415456T2
公开(公告)日：1999-05-12
申请号：DE69415456
申请日：1994-03-04
Applicant: SONY CORP
Inventor： WATANABE KENJIRO , TAKEDA TORU , SEKO SATORU , KAWAZOE KAZUSHIGE , MUTO TAKAYASU , MORITA OSAMU , HAYASHI NOBUHIRO , ISHIDA TAKEHISA , ISHIOKA HIDEAKI , YAMAKOSHI TAKAMICHI
IPC: G11B5/008 , G11B5/012 , G11B5/55 , G11B5/596 , G11B5/64 , G11B5/09 , G11B5/73 , G11B5/82 , G11B5/84 , G11B20/10 , G11B20/12 , G11B20/18 , G11B21/10 , G11B25/04 , G11B27/19 , G11B27/30 , G11B33/14
Abstract: A magnetic disk apparatus suitable for use as a hard disk apparatus in a computer system. The apparatus includes a disk-like medium having a magnetic film formed on a surface, which information is recorded on or reproduced from; and magnetic heads (20 - 31) for recording on or reproducing from the information the disk-like medium. The disk-like medium has data recording regions (20 - 41D) and control signal recording regions (20 - 40), (20 - 41H). In the data recording regions, data tracks are raised and adjacent data tracks are separated by recessing guard bands (20 - 20). In the control signal recording region, on the other hand, tracking marks (20 - 12), (20 - 13) for tracking control of the magnetic heads, track number marks (20 - 71) for stipulating the tracks , track numbers (20 - 41b1), (20 - 41b2) and clock marks (20 - 11) for equidistantly dividing a circumference are formed in projections and recesses along the paths (21 - 21) of the magnetic heads. In this apparatus, the guard band is recessed with respect to the track. Accordingly, the guard band needs not be expanded so as to reduce cross-talk, and a recording capacity can be increased by reducing the track pitch. Because the tracking mark and the track number mark or the clock mark are formed in projections and recesses along the paths of the magnetic heads, accurate access becomes possible even when the track pitch is reduced.
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公开(公告)号：DE69415456D1
公开(公告)日：1999-02-04
申请号：DE69415456
申请日：1994-03-04
Applicant: SONY CORP
Inventor： WATANABE KENJIRO , TAKEDA TORU , SEKO SATORU , KAWAZOE KAZUSHIGE , MUTO TAKAYASU , MORITA OSAMU , HAYASHI NOBUHIRO , ISHIDA TAKEHISA , ISHIOKA HIDEAKI , YAMAKOSHI TAKAMICHI
IPC: G11B5/008 , G11B5/012 , G11B5/55 , G11B5/596 , G11B5/64 , G11B5/09 , G11B5/73 , G11B5/82 , G11B5/84 , G11B20/10 , G11B20/12 , G11B20/18 , G11B21/10 , G11B25/04 , G11B27/19 , G11B27/30 , G11B33/14
Abstract: A magnetic disk apparatus suitable for use as a hard disk apparatus in a computer system. The apparatus includes a disk-like medium having a magnetic film formed on a surface, which information is recorded on or reproduced from; and magnetic heads (20 - 31) for recording on or reproducing from the information the disk-like medium. The disk-like medium has data recording regions (20 - 41D) and control signal recording regions (20 - 40), (20 - 41H). In the data recording regions, data tracks are raised and adjacent data tracks are separated by recessing guard bands (20 - 20). In the control signal recording region, on the other hand, tracking marks (20 - 12), (20 - 13) for tracking control of the magnetic heads, track number marks (20 - 71) for stipulating the tracks , track numbers (20 - 41b1), (20 - 41b2) and clock marks (20 - 11) for equidistantly dividing a circumference are formed in projections and recesses along the paths (21 - 21) of the magnetic heads. In this apparatus, the guard band is recessed with respect to the track. Accordingly, the guard band needs not be expanded so as to reduce cross-talk, and a recording capacity can be increased by reducing the track pitch. Because the tracking mark and the track number mark or the clock mark are formed in projections and recesses along the paths of the magnetic heads, accurate access becomes possible even when the track pitch is reduced.
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公开(公告)号：NL1009451A1
公开(公告)日：1998-12-22
申请号：NL1009451
申请日：1998-06-19
Applicant: SONY CORP
Inventor： MUTO TAKAYASU
Abstract: To provide a serial interface circuit capable of converting a large volume of data into packets based on a predetermined standard for transmission and reception and capable of performing smooth transmission and reception processing, which comprises a transaction layer circuit serving as a data processing circuit to which a storage device is connected, which reads data of the storage device, adds a self-designating transaction label, and transmits the data as a transmission asynchronous packet to a serial interface bus BS and, when transferring data of another node to the storage device, generates a request packet to which it had added a self-designating label and transmits the same to the serial interface bus BS, receives a response packet for this request packet from the another node, takes out a data portion from the response packet, and transfers this to the storage device.
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公开(公告)号：JPH08203088A
公开(公告)日：1996-08-09
申请号：JP1320995
申请日：1995-01-30
Applicant: SONY CORP
Inventor： OKAWA YOSHIHIRO , MUTO TAKAYASU
Abstract: PURPOSE: To a provide stable focusing servo by controlling a changeover means so as to select ad output a focusing servo clock after the pull-in of focusing servo. CONSTITUTION: A spindle driver 7 outputs lock signal when a spindle motor 6 reaches a prescribed revolution speed and informs a DSP 47 of stable rotation. The DSP 47 drives to rotate the spindle motor 6 in compliance with a demand from a host computer 3 when a magnetooptical disk 5 is mounted on a turntable by means of a loading mechanism 8. The DSP 47 moves a pickup 9 through a pulse width moduration(PWM) circuit 45 by means of a pickup driver 44, locates a beam spot out of a user's area and prevents erroneous erasure.
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公开(公告)号：JPH08106729A
公开(公告)日：1996-04-23
申请号：JP24434094
申请日：1994-10-07
Applicant: SONY CORP
Inventor： MUTO TAKAYASU
Abstract: PURPOSE: To start recording from the accurate place of recording start even when the time is required until a servo pattern is detected. CONSTITUTION: A magneto-optic disk recording reproducing device has a channel clock forming section 2 forming a channel clock by variously controlling the phase of a fundamental clock in response to the places of recording reproduction on an magneto-optic disk 1. A CPU 40, a phase-comparison timing generator 41 and a phase-comparison timing generating register 42 control a second phase- locked-loop circuit with a comparator 34, a second voltage variable controlled type oscillator 36, etc., so as to quicken the phase comparison timing of the fundamental clock and the channel clock only for the time required until a servo pattern is detected at the time of recording.
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Patent Agency Ranking
公开(公告)号：JPH07130100A
公开(公告)日：1995-05-19
申请号：JP29417293
申请日：1993-10-29
Applicant: SONY CORP
Inventor： MUTO TAKAYASU
IPC: G11B20/10
Abstract: PURPOSE:To reduce power consumption by stopping a VCO when it is not required. CONSTITUTION:A phase error detecting circuit 21 detects the difference between the phase of the servo pattern detection data recorded on a magneto-optical disk 1 with a prescribed interval and the phase of the channel clock outputted from a VCO 32 and the VCO 32 is driven by a channel clock with a phase so that the phase difference above becomes zero. When a processor 51 detects the condition of the device to be a non-recording or a non-reproducing, the VCO 32 operation is stopped.
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公开(公告)号：JPH0745002A
公开(公告)日：1995-02-14
申请号：JP18532393
申请日：1993-07-27
Applicant: SONY CORP
Inventor： MUTO TAKAYASU
Abstract: PURPOSE:To maintain stable PLL operation by driving a VOC' with an average phase error detecting data even when a regenerative waveform of a servo pattern is disturbed due to seek, etc. CONSTITUTION:The VOC 35 is driven in order to make a phase error of a channel clock for detecting data of a servo pattern consisting of one pair of wobble pits to be deflectively recorded on the inner circumferential side and the outer circumferential side across a recording track on a magneto-optical disk 1 zero. Peak values of the regenerative waveforms of the individual wobble pits are added up and supplied to a divider 30 by a wobble peak calculator 31. In the divider 30, a phase error detecting data detected by a phase generator 23 is processed to be divided by the added data. A changeover switch 32 is controlled to be changed by a processor 36 so that the VCO 35 is driven by the phase error detecting data processed in the above division at the time of seek, etc.
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公开(公告)号：JPH06236629A
公开(公告)日：1994-08-23
申请号：JP2454493
申请日：1993-02-12
Applicant: SONY CORP
Inventor： MUTO TAKAYASU
Abstract: PURPOSE:To maintain a stable lock state by using the disk-shaped recording medium formed with clock marks as approximately radial patterns continuous in the diametral direction of the disk-shaped recording medium. CONSTITUTION:The clock marks Mc are detected by the entire range of the track width at the magnetic gap of a magnetic head if the disk-shaped recording medium D is, for example, a magnetic disk. Since the clock marks Mc are formed as the approximately radial patterns continuous in the diametral direction of the disk-shaped recording medium D in such a case, the amplitude of a clock reproduced signal does not change and remains constant in spite of off-track of a reproducing head. The reproducing head always crosses the clock marks Mc even if the reproducing head crosses a servo region Zs at a high speed at the time of seeking of the reproducing head and, therefore, the reproduced signal of good S/N is obtd. and the stable lock state of a PLL circuit is maintained.
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公开(公告)号：JPS63200371A
公开(公告)日：1988-08-18
申请号：JP3072787
申请日：1987-02-13
Applicant: SONY CORP
Inventor： MUTO TAKAYASU
IPC: G11B21/10
Abstract: PURPOSE:To discriminate directivity and to obtain a stable speed signal, by recording servo signals with phase difference of 90 deg. with each other on two disk planes A and B, and using position signals with two phases. CONSTITUTION:The disk plane 1A on one side of a magnetic disk is divided into sectors in a radial shape, and data recording areas D1a-D3a and servo signal storage areas S1a-S3a are provided on each sector. Also, on the plane 1B on the other side, those areas are provided responding to the plane 1A, and a try bit signal is used as a servo signal to be recorded on the disk planes 1A and 1B, and a servo track is shifted by 1/2 pitch. Two disks formed in such way are used, and recording/reproducing heads 3A and 3B are abutted with both planes of the disk 1, and heads 4A and 4B with both planes of the disk 2, and the position signals of two phases are found at a position signal formation circuit 11, then, they are supplied to a speed signal formation circuit 12. Afterwards, the circuit 12 also generates the speed signals of two phases by differentiating the position signal, and stabilizes the directivity by the signals.
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公开(公告)号：JPS6358683A
公开(公告)日：1988-03-14
申请号：JP20316586
申请日：1986-08-29
Applicant: SONY CORP
Inventor： HOSHIMI SUSUMU , MUTO TAKAYASU
IPC: G11B21/10
Abstract: PURPOSE:To perform quick shift of a head by providing the reference servo tracks to plural divided information areas in response to synchronism of the output signal of a head position detecting means to store the off-track value and shifting the servo tracks for matching by an amount equal to the head shift value after positioning in case of head shifting. CONSTITUTION:A microprocessor 8 changes over a switch 13 with application of a power supply and subtraction 11 is performed between the speed reference value and the frequency/voltage conversion value of the output of an optical sensor 2. Then the error voltage is applied to an actuator motor 6 and the track pulses are counted to shift a magnetic head 3 into a target reference servo track. Then the witch 13 is hanged over to produce the position reference value and one of 4-phase output signals of the sensor 2 is selected (7) and undergoes subtraction9. Thus a motor 6 is revolved and halted at error voltage O (designated track). Then the servo signal of a magnetic disk 1 is detected by the head 3 and processed (15) and an actual difference is calculated between a reference servo track and a center. The off-track value stored previously is corrected for fine adjustement of the head 3. As a result, the shift time of the head 3 is shortened.
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