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1. 发明专利

JPS61107579A Positioning control circuit of magnetic head 失效
标题翻译：磁头定位控制电路
公开(公告)号：JPS61107579A
公开(公告)日：1986-05-26
申请号：JP22925384
申请日：1984-10-31
申请人： Toshiba Comput Eng Corp , Toshiba Corp
发明人： HATTORI MASAKATSU , ASAI KENJI
IPC分类号： G11B21/08 , G11B21/10
CPC分类号： G11B21/085
摘要： PURPOSE:To position a magnetic head securely at a target position taking the maximum seek operating time by adjusting a output signal from a adding amplifier even when a velocity signal deviates from optimum value. CONSTITUTION:When change of control is made into positioning control, if velocity signal V changes and exceeds an usual level, the peak value to be held at peak hold circuit 20 becomes high. As a consequence, the voltage level Vg of the gain adjust signal G to be output from the peak hold circuit 20 becomes high, and the gain of an AGC amplifier 21 is set at value greater than usual value. Therefore, the level of a velocity signal V to be output from the AGC amplifier 21 becomes greater than the usual level. With this, if values of input resistances r1 and r2 and value of feedback resistance rf are kept constant, the output signal (or negative voltage signal) from the add amplifier 11 becomes great, and the voice coil motor speed is reduced more quickly than the usual.
摘要翻译：目的：即使当速度信号偏离最佳值时，也可以通过调整来自加法放大器的输出信号，将磁头牢固地定位在目标位置，从而获得最大寻道操作时间。构成：当对定位控制进行控制时，如果速度信号V变化并超过常规电平，则在峰值保持电路20保持的峰值变高。结果，从峰值保持电路20输出的增益调整信号G的电压电平Vg变高，AGC放大器21的增益被设定为大于通常值的值。因此，从AGC放大器21输出的速度信号V的电平变得比通常的电平高。这样，如果输入电阻r1和r2的值和反馈电阻rf的值保持恒定，则来自加法放大器11的输出信号（或负电压信号）变大，并且音圈电机速度比通常。

2. 发明专利

JPH02302974A HEAD POSITIONING CONTROLLER FOR DATA RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH02302974A
公开(公告)日：1990-12-14
申请号：JP12226989
申请日：1989-05-16
申请人： TOSHIBA CORP , TOSHIBA COMPUTER ENG
发明人： TAKEMURA TORU , ASAI KENJI
IPC分类号： G11B21/10
摘要： PURPOSE:To prevent the positioning control of a head from being made unstable due to a magnetic noise to accompany a write action by inhibiting the transfer of a servo signal from a servo head at the time of the write action of a data head adjacent to the servo head and using the servo signal stored before the write action. CONSTITUTION:A servo means 16 generates a signal for head positioning control from the servo data on a servo surface 10a read with a servo head 12 and the servo data on a data surface 10b read with data heads 13a-13c. A memory means 27 stores the servo data on the servo surface 10a read from the servo head 12. A switching means 17 reads the servo data on the servo surface 10a before the execution of a write mode from the memory means 27 and transfers the data to the servo means 16 when the data head 13c adjacent to the servo head 12 is in the write mode. In such a case, at the time of the write action of the data head 13c adjacent to the servo head 12, the use of the servo data on the servo surface 10a is inhibited. Thus, the positioning control of the head can be prevented from being made unstable due to the magnetic noise to accompany the write action.

3. 发明专利

JPH02201784A HEAD POSITIONING CONTROLLER 失效
公开(公告)号：JPH02201784A
公开(公告)日：1990-08-09
申请号：JP2101089
申请日：1989-01-31
申请人： TOSHIBA CORP , TOSHIBA COMPUTER ENG
发明人： NOTAKE YUICHI , OGAWA TOMIHISA , ASAI KENJI
IPC分类号： G11B21/10
摘要： PURPOSE:To shorten a read/write processing time by simplifying the positioning control operation of a head when a head is switched to a different data surface on the same cylinder. CONSTITUTION:When the switching mode of a data head 10 is executed, and the data head 10 corresponding to a switched data surface 14 is selectively designated, a CPU 21 decides that the former and latter data heads 10 are positioned at the center of a target track on the same cylinder if a target track where the former and latter heads 10 read/write is on the same cylinder, and an offset quantity corresponding to the respective heads 10 is in the allowable range of a positioning error. Further the positioning control operation for the latter data head 10 is omitted, and the high-speed mode control of an immediate read/write operation is executed. Thus in the read/write processing by means of the latter data head 10, the processing time can be shortened by a period necessary for the positioning control operation.

4. 发明专利

JPH0281367A DATA REPRODUCING DEVICE FOR RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH0281367A
公开(公告)日：1990-03-22
申请号：JP23264688
申请日：1988-09-19
申请人： TOSHIBA CORP , TOSHIBA COMPUTER ENG
发明人： UCHIUMI TORU , ASAI KENJI
IPC分类号： G11B20/10
摘要： PURPOSE:To reproduce the servo signal of a proper level surely and at a high speed by providing a control voltage calculating means for servo and a control voltage setting means for servo. CONSTITUTION:The title device provides a control voltage calculating means for servo to compare the level of a servo signal read from a head 10 with the reference value determined beforehand at the initial setting mode time and store the data of the control voltage of an AGC amplifying circuit set when the compared result is in the allowable range into a memory 32. Further, a control voltage setting means for servo to read the data of the control voltage stored into the memory 32 and set the control voltage to the AGC amplifying circuit when a servo signal is outputted from a head 10 at the time of the ordinary action mode. Thus, the proper level servo signal can be reproduced surely and at a high speed, and as the result, based on the data face servo data, the positioning control of the magnetic head can be executed surely and at a high speed.

5. 发明专利

JPS6386168A CONTROLLER FOR MAGNETIC HEAD OF MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS6386168A
公开(公告)日：1988-04-16
申请号：JP23071086
申请日：1986-09-29
申请人： TOSHIBA CORP , TOSHIBA COMPUTER ENG
发明人： TAKIZAWA TOSHIMITSU , ASAI KENJI
IPC分类号： G11B21/12
摘要： PURPOSE:To reduce the abrasion caused by a contact of a head and a disk at the time of retraction by controlling the switching to retraction driving after a main power source is turned off and a prescribed period elapses. CONSTITUTION:When a main power source is turned OFF, a relay 20 is actuated by a CPU 15 and a relay driver 21 and a contact NC is selected. In the same way, at a point from the time of turning OFF the power source, after a delay time corresponding to a time constant of a capacitor 24, and up to stopping of a disk, a relay 25 selects the contact NC and retraction driving by a voice coil motor 12 is executed through a capacitor 22 of a retraction power source. Accordingly, the retraction driving is executed in accordance with a head position at the time when the power source is turned OFF, and a position where a head is brought into contact with the disk and slides in accordance with said position does not become constant but becomes random. As a result, the abrasion caused by a contact of the head and the disk is remarkably reduced.

6. 发明专利

JPH04103084A HEAD POSITIONING CONTROL DEVICE FOR DATA RECORDING/ REPRODUCING DEVICE 失效
公开(公告)号：JPH04103084A
公开(公告)日：1992-04-06
申请号：JP22148790
申请日：1990-08-23
申请人： TOSHIBA CORP , TOSHIBA COMPUTER ENG
发明人： ASAI KENJI
IPC分类号： G11B21/10
摘要： PURPOSE:To attain an accurate positioning control for a head without making the positioning accuracy worse by adjusting a servo control gain on data face in accordance with track widths of each data head. CONSTITUTION:The gain adjusting amounts of servo control on data face according to the track width of data heads 15 are calculated by an arithmetic circuit 102, and the servo control gain adjusting amount on data face obtained therefrom are stored in a memory circuit 103 individually for each data head. Then the gain adjusting amounts of servo control on data face for each data head are read out from the memory circuit 103 in accordance with the selected head number for every time when the changeover of head is detected by a head changeover circuit 21, then the read out control gain adjusting amount is supplied to a control gain adjusting circuit 104 to adjust the servo control gain on data face. By this procedure, the relation between a positioning signal on data face and a positional deviation of the data head 15 can be maintained without being affected by a variance of track widths for the data heads 15, then the accurate positioning control can be executed.

7. 发明专利

JPH0411369A HEAD POSITIONING CONTROLLER FOR DATA RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH0411369A
公开(公告)日：1992-01-16
申请号：JP11277490
申请日：1990-04-27
申请人： TOSHIBA CORP , TOSHIBA COMPUTER ENG
发明人： OGAWA TOMIHISA , ASAI KENJI
IPC分类号： G11B21/10
摘要： PURPOSE:To control positioning of a head with a high precision by adjusting the data face servo control gain in accordance with the track width of each data head with respect to a head positioning controller adopting the servo face servo system as well as the data face servo system. CONSTITUTION:A servo face servo signal is read out from a servo face 12 by a servo head 14, and a servo face positioning signal is generated by a servo face servo control circuit 17. A data face servo signal is read out from a data face 13 by a data head 15 selected by a head switching circuit 21, and a data face positioning signal is generated by a data face servo control circuit 18. The extent of data face servo control gain adjustment for each data head is read out from a memory circuit 103 in accordance with the selected head number at each time of detecting the head switching by the head switching circuit 21, and this extent of control gain adjustment is given to a control gain adjusting circuit 104 to adjust the data face servo control gain. Thus, positioning control of high precision is performed.

8. 发明专利

JPH02254687A HEAD POSITIONING CONTROLLER FOR DATA RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH02254687A
公开(公告)日：1990-10-15
申请号：JP7606189
申请日：1989-03-28
申请人： TOSHIBA CORP , TOSHIBA COMPUTER ENG
发明人： NOTAKE YUICHI , ASAI KENJI
IPC分类号： G11B21/10
摘要： PURPOSE:To shorten the time of a position correcting processing by utilizing correction data to be prepared once at the time of positioning a head in a compatible servo system. CONSTITUTION:A control circuit 17 controls an actuator driving mechanism 15 based on the correction data from a data surface servo circuit 18 and executes the position correcting processing to execute the slight movement control of a carriage 14. Namely, a data head 13 is correctly positioned in the center of the goal track of a data surface 10b to be designated in following a servo head 12. In the case, by preparing the correction data for the data surface 10b and, thereafter, temporarily storing them in a memory 20, a processing to read data surface servo data for each time from the accessed data surface 10b at the time of a positioning control mode can be omitted, and the processing time of the positioning control mode can be shortened.

9. 发明专利

JPH02122484A DATA REPRODUCING DEVICE FOR RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH02122484A
公开(公告)日：1990-05-10
申请号：JP27563888
申请日：1988-10-31
申请人： TOSHIBA CORP , TOSHIBA COMPUTER ENG
发明人： OGAWA TOMIHISA , KAIDA KATSUHIKO , NOTAKE YUICHI , ASAI KENJI
IPC分类号： G11B5/09 , G11B21/10
摘要： PURPOSE:To always stably set a proper gain by outputting a voltage level control signal, which is set based on an error between a read signal level and a preset reference voltage level, to an AGC amplifier circuit as a control signal for its gain control. CONSTITUTION:The peak of a position signal P from a low pass filter 14 is held by a peak hold circuit 30 with a reference of a 1st reference voltage VR1, and this hold output Pp is smoothened and afterward outputted to an input terminal (+) on one side of a comparator 32. The hold output Pp is compared with a 2nd reference voltage VR2 by the comparator 32, and when the hold output Pp is higher in level, a high level output voltage is outputted. On the other hand, when the hold output Pp is lower in level as a result of the comparison, the level of the control signal G is lowered on the contrary to adjust the gain of the AGC (Automatic Gain Control) amplifier 13 to be increased. By this method, the amplitude of an output signal of the AGC amplifier 13 can be kept constant.

10. 发明专利

JPS6337815A RECORDED DATA REPRODUCING DEVICE 失效
公开(公告)号：JPS6337815A
公开(公告)日：1988-02-18
申请号：JP17771686
申请日：1986-07-30
申请人： TOSHIBA CORP , TOSHIBA COMPUTER ENG
发明人： KAIDA KATSUHIKO , ASAI KENJI
IPC分类号： G11B5/596 , G11B5/012 , G11B20/10 , G11B21/08 , G11B21/10
摘要： PURPOSE:To simplify the constitution of an AGC amplifier system by converting a peak value of read servo information into digital servo information so as to control the gain of the read AGC amplifier circuit via a control means in a built-in servo system magnetic recording and reproducing device. CONSTITUTION:Analog recorded information read by a magnetic head 10 via an AGC amplifier 13 and servo information are processed by a peak hold circuit 18 and an A/D converter 19 to convert the peak value of the servo information into digital servo information, which is fed to a CPU 30 of a control means. Magnetic head positioning information and a built-in table in the CPU 30 are referenced to output a signal controlling the gain of the amplifier 13 and the gain of the amplifier 13 is controlled via a D/A converter 31. Thus, no AGC generator is required and the constitution of the AGC amplifier system is simplified.

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