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1. 发明专利

JPS6414778A MUTUAL INTERFERENCE SUPPRESSING SYSTEM FOR INFORMATION STORAGE DEVICE 失效
公开(公告)号：JPS6414778A
公开(公告)日：1989-01-18
申请号：JP17035287
申请日：1987-07-08
申请人： FUJITSU LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： HATAGAMI TOSHIBUMI , SHINOHARA TORU , IWATSUBO MASATO , MIZUKAMI MAKOTO , KAKIZAKI TAKAO
IPC分类号： G11B21/08
摘要： PURPOSE:To suppress mutual interference at the time of seaking operation of head actuators by attenuating an acceleration signal for one head actuator and impressing the attenuated signal to the other head actuator with reverse polarity as a driving current. CONSTITUTION:The titled system is provided with acceleration signal forming circuits 4a, 4b for differentiating speed signals va, vb to form acceleration signals by controlling respective driving signals 3a, 3b by the speed signals va, vb to form the acceleration signals alphaa, alphab from the speed signals va, vb. These signals alphaa, alphab are inputted to the other driving systems each other with reverse polarity. Thereby, the driving current ia of the head actuator 2a in the system (a) is obtained by adding the acceleration signal alphab of the system (b) with reverse polarity to the sped signal va in the system (a) and the driving current ib of the head actuator 2b in the system (b) is obtained by adding the acceleration signal alphaa of the system (a) with reverse polarity to the speed signal vb of the system (b). In both the cases, the signal with reverse polarity is impressed to the driving current in the other system so that gain is reduced. Consequently, mechanical interference due to operation between the actuators can be electrically and stably suppressed.

2. 发明专利

JPS63277485A EXCESSIVE SPEED CONTROL SYSTEM FOR SERVOMOTOR 失效
公开(公告)号：JPS63277485A
公开(公告)日：1988-11-15
申请号：JP11149987
申请日：1987-05-07
申请人： FUJITSU LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： SHINOHARA TORU , HATAGAMI TOSHIBUMI , IWATSUBO MASATO , MATSUMOTO KATSUAKI , OTANI KOJI
IPC分类号： H02P3/12 , G11B21/08
摘要： PURPOSE:To detect the condition of excessive speed correctly, by a method wherein the condition of excessive speed, in which the speed of a servomotor has become higher than a set limit speed, is detected by the speed signal of a servo control loop. CONSTITUTION:An excessive speed control system for a servomotor is constituted of a detecting unit 11, detecting the driving speed of the servomotor 4, an excessive speed detecting unit 13, a servo control unit 14 and a driving unit 15 while the servomotor 4 is driven in accordance with the control output DVS of the servo control unit 14 and the servomotor 4 is short-circuited when the servo control unit 14 has received an excessive speed detecting signal BS. The excessive speed detecting unit 13 is constituted of an excessive speed deciding circuit 13a and a latch circuit 13b while the detecting unit 13 changes a speed signal VS from the speed detecting unit 11 into an absolute value and compares it with a limit speed signal V0. When ¦VS¦>=V0, the detecting unit 13 outputs an excessive speed output to latch the running of the servomotor and generates the excessive speed detecting signal BS.

3. 发明专利

JPH0935214A POWER SOURCE CONTROL CIRCUIT AND STORAGE DEVICE 失效
公开(公告)号：JPH0935214A
公开(公告)日：1997-02-07
申请号：JP18036295
申请日：1995-07-17
申请人： FUJITSU LTD
发明人： SHINOHARA TORU
IPC分类号： G11B5/09 , G11B5/00 , G11B5/012 , G11B5/02 , G11B5/39 , G11B5/40 , G11B5/56 , G11B5/58 , G11B19/04 , G11B20/00
摘要： PROBLEM TO BE SOLVED: To accurately control a potential to be impressed upon a head by setting a head potential accurately to a reference voltage even when characteristics of a power source circuit and a signal processing circuit are somewhat changed with the lapse of time. SOLUTION: A magnetic disk device is composed of a positive power source circuit 1, the power source control circuit 2 and a disk enclosure 5, and the power source control circuit 2 consists of a negative power source circuit 3 and a control part 4. The control part 4 consists of a central processing unit(CPU), etc., while the disk enclosure 5 consists of a head IC (HDIC) 6, an MR head 7 and a magnetic disk 8, where the HDIC 6 is supplied with a power source voltage +V from the positive power source circuit 1 and a power source voltage -V from the negative power source circuit 3. Since a potential of the MR head 7 can accurately be set to OV (grounded) even when characteristics of the negative power source circuit 3 and the HDIC 6 are somewhat changed with the lapse of time, a spark is surely prevented from taking place between the MR head 7 and the magnetic disk 8.

4. 发明专利

JPH07287625A DEVICE WITH COOLING FAN AND FAN CONTROLLING METHOD 失效
公开(公告)号：JPH07287625A
公开(公告)日：1995-10-31
申请号：JP7831394
申请日：1994-04-18
申请人： FUJITSU LTD
发明人： SHINOHARA TORU
IPC分类号： G06F1/20 , F04D27/00 , H05K7/20
摘要： PURPOSE:To continuously perform the cooling operation of a device by a fan without lowering the cooling effect as much as possible even when the rotation of the cooling fan is stopped due to a trouble. CONSTITUTION:In a device where plural cooling fans 3 and 4 are installed within the same duct and power supply is supplied from a power source unit 7 via each power feeding circuit for every fan, the power feeding circuit for every fan is provided with switches SW1 and SW2 opening and closing the each power feeding circuit. With the switches, rotation detection parts 8 and 9 and drive circuits 26 and 27 are provided as switch control means opening the switch of a pertinent fan power feeding circuit and stopping the power feeding to the fan whose rotation is stopped when the rotation of the fan is monitored for every fan and the fan rotation stoppage due to a fan abnormality is detected.

5. 发明专利

JPH06243574A SERVO POSITION DETECTING DEVICE FOR DISK DEVICE 失效
公开(公告)号：JPH06243574A
公开(公告)日：1994-09-02
申请号：JP5497793
申请日：1993-02-19
申请人： FUJITSU LTD
发明人： KOSUGI TATSUHIKO , HASHIMOTO SHUICHI , SHINOHARA TORU
IPC分类号： G11B19/28 , G11B5/596 , G11B20/14 , G11B20/18 , G11B21/10 , G11B19/02
摘要： PURPOSE:To facilitate on-track control over all cylinders by generating a head position signal from a signal corresponding to a phase difference between a reference clock and a servo data. CONSTITUTION:A magnetic disk 21 is provided with a training area recorded with a timing signal in front of a servo area recorded with servo information in the rotating direction. Then, the reference clock synchronized in phase with the timing signal read out by a head 23 is generated by a PLL circuit 44. Now, a signal corresponding to a phase difference between the reference clock and the servo data in the servo area is outputted by a phase difference detecting circuit 47. The position signal for showing a position of the head is generated by an A/D converter 34 via an integration circuit 48 from the signal corresponding to the phase difference from the circuit 47. Then, since the reference clock and a servo pattern are synchronized with each other, the phase difference is detected with good accuracy, and because of integration, a mean value of the phase differences is easily evaluated, so that the position detecting accuracy can be enhanced. Thus, the on-track control can easily be performed over all the cylinders.

6. 发明专利

JPH04102262A SYNCHRONIZING SIGNAL REGENERATING DEVICE FOR MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH04102262A
公开(公告)日：1992-04-03
申请号：JP21853390
申请日：1990-08-20
申请人： FUJITSU LTD
发明人： SHINOHARA TORU , HASHIMOTO SHUICHI
IPC分类号： G11B20/10 , G11B5/55 , G11B5/596 , G11B19/04 , G11B20/00 , G11B20/14 , G11B21/08
摘要： PURPOSE:To prevent the infeasibility of demodulating a position signal and to enable the high density write, high speed positioning and stable positioning by inhibiting a synchronizing signal from being outputted to a synchronizing clock generating means during a period rather than the correct demodulating timing. CONSTITUTION:When a spindle motor 13 is started up and a specified speed is obtained, RTZ processing for positioning a head to the outermost side cylinder is commenced. Then, when on-track is discriminated, a signal to a gate means 20 is set at an L-level, and a window signal for removing an erroneously detected synchronizing signal is started to take place, and even when the erroneous synchronizing signal is demodulated by a synchronizing signal demodulating means 16, this is removed by a signal produced by the means 20 to output only a correct synchronizing signal to the synchronizing clock generating means 18.

7. 发明专利

JPH0461076A OFF-TRACK AMOUNT MEASURING CIRCUIT FOR MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH0461076A
公开(公告)日：1992-02-27
申请号：JP16979990
申请日：1990-06-29
申请人： FUJITSU LTD
发明人： SHINOHARA TORU
IPC分类号： G11B21/10
摘要： PURPOSE:To measure an accurate off-track amt. by constituting a gate means with a demodulated signal comparing means having a hysteresis characteristic for preventing erroneous detection due to noise to be superimposed in the vicinity of a zero level of a demodulated signal. CONSTITUTION:The subject circuit is provided with the gate means for comparing demodulated two kinds of servo signals with each other in signal level and producing a gate signal, and the gate means is constituted out of the demodulated signal comparing means having a hysteresis characteristic for preventing erroneous detection due to noise to be superimposed in the vicinity of zero level of the demodulated signal. That is, the off-track amt. measuring circuit consists of a gain control part 21, a rectifying device means 22, a capacitor 23 constituting a peak hold circuit together with a rectifying means, a comparator 24 and a differential amplifier 26, and a resistor 25 for positive feedback is provided between an input line and an output line of the comparator 24. By this method, the correct off-track amt. can be measured without being influence by noise of the measuring circuit.

8. 发明专利

JPH01150915A SERVO POSITIONING CONTROL DEVICE 失效
公开(公告)号：JPH01150915A
公开(公告)日：1989-06-13
申请号：JP31066987
申请日：1987-12-08
申请人： FUJITSU LTD
发明人： SHINOHARA TORU , TSURUMI KOJI
IPC分类号： G05D3/12
摘要： PURPOSE:To improve positioning tracing accuracy by controlling a driving part so as to be switched to an A-grade action after the operation of a B-grade action with a servo control part when a servo motor is servo-controlled to an aimed value. CONSTITUTION:A servo control part CT controls a driving part 6' so as to be switched to the A-grade action after an operation by the B-grade action. In a servo control process, the part 6' is switched to the B-grade action at a time point necessary for a large power, and to the A-grade action when the small power is sufficient. The A-grade action is not fit for the large power as well known, whereas, it does not generate crossover deviation, and promptly responds to the minute current displacement. On the other hand, for the positioning control, it initially drives the servo motor at high speed by a maxi mum current, and minutely controls the motor near the aimed position by the small current. Consequently, by driving the part 6' by the B-grade action, and then switching to the A-grade action near the aimed position, both the high- speed driving and high position tracing accuracy can be obtained.

9. 发明专利

JPS61145775A SERVO MOTOR CONTROL SYSTEM 失效
公开(公告)号：JPS61145775A
公开(公告)日：1986-07-03
申请号：JP26792584
申请日：1984-12-19
申请人： FUJITSU LTD
发明人： HATAGAMI TOSHIBUMI , SHINOHARA TORU
IPC分类号： G05D3/12 , G11B5/596 , G11B21/08 , G11B21/10
摘要： PURPOSE:To set quickly and accurately a record/reproduction head to a target track position by increasing the output gain of an operational amplifier part up to a prescribed level by an output gain changing means after detecting that a detection means reaches its prescribed position. CONSTITUTION:A difference counter 13 delivers a prescribed signal (6) to a shift distance signal (5) (applied by the counter value) from a target track set previously at a time point when the count value is subtracted at a point precedingly by half the target track. While an electronic switch 14 releases the short state of a register R2 whose contact is opened in case a normal contact is shorted and the signal (6) is sent from the counter 13. Then the output gain of an operational amplifier 4 is increased at a point precedingly by half the desired track, and the deceleration of a servo motor 6 is promoted temporarily. In such a way, the output gain of the amplifier 4 is increased at a point immediately before the target track. Thus a record/reproduction head can be set quickly at the target track without increasing substantially the load of a mechanical system.

10. 发明专利

JPH07105676A MAGNETIC DISK MODULE 失效
公开(公告)号：JPH07105676A
公开(公告)日：1995-04-21
申请号：JP24943693
申请日：1993-10-05
申请人： FUJITSU LTD
发明人： KORIGAWA MASAYUKI , SHINOHARA TORU , IWATSUBO MASATO , YOKOYAMA SAORI , OMORI HIDEKI , WATANABE TAKASHI , OSUGI TSUNEO
IPC分类号： G11B25/04 , G11B33/12 , H05K7/14
摘要： PURPOSE:To facilitate repair by providing a 3rd connector at the rear end of a case in order to plug-in connect a magnetic disk module with the connector of a storage device main body when the magnetic disk module is inserted in the storage device main body. CONSTITUTION:The connector 36 is provided at the rear end of a disk drive unit 14 and can be plug-in connected with the connector 26 of a mother board 24. The connector 38 is provided at the rear end of a printed board 16 and can be plug-in connected with the connector 28 of the mother board 24. The connectors 30, 32 and 34 on the back side of the mother board 24 are respectively connected to cables 40, 42 and 44, and the cables 40, 42 and 44 are connected to the connector 22, a power source unit 18 and the connectors 30 to 32. In such a case, the disk drive unit 14 or the printed board 16 can be detached in a state where the connector 22 of the cable 40 is connected to the connector of the device main body, so that the repair or exchange is rapidly performed.

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