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1. 发明专利

JPS60140584A MAGNETIC DISK AND MAGNETIC DISK DEVICE USING IT 失效
公开(公告)号：JPS60140584A
公开(公告)日：1985-07-25
申请号：JP25036183
申请日：1983-12-28
申请人： HITACHI LTD
发明人： HIRANO YOSHIYUKI , SEO YOUSUKE , NARUSE ATSUSHI , SHIMIZU TAKEMASA
IPC分类号： G11B5/012 , G11B5/596 , G11B27/10
摘要： PURPOSE:To enable to improve the accuracy of track following without causing positioning error by arranging position signals recorded in each recording area to deviate in circumferential direction between each recording area. CONSTITUTION:The position signal 11B of the second face 10B is shifted to the position signal 11A of the first face 10A of a disk assembly by an angle alpha obtained by dividing equally the sector interval of the disk surface by the number of heads, and the position signal of the third face 10C is arranged similarly. When the head is shifted between tracks, a position signal proportionate to radial deviation is written previously, and pulse is generated utilizing the fact that the position signal becomes ''0'' when the head comes to the center of the track. Distinction of pulse of the adjoining track is made utilizing the difference of polarity of position signals 30, 31 of the track. Positioning error is not caused even when the moving speed is made high, and improvement of the accuracy of track following is made possible.

2. 发明专利

JPS60139143A COIL FOR VOICE COIL MOTOR 失效
公开(公告)号：JPS60139143A
公开(公告)日：1985-07-23
申请号：JP24383883
申请日：1983-12-26
申请人： HITACHI LTD
发明人： HIRANO YOSHIYUKI , KAWAKUBO YOUICHI , SEO YOUSUKE , KAWAKAMI SHIYUU , SENDA TOMOHISA , KAWADA SHINICHI
IPC分类号： H01F5/06 , H02K3/30 , H02K33/18 , H02K41/035
摘要： PURPOSE:To enhance the heat resistance of a coil by securing the coil with glass. CONSTITUTION:A bobbin 1 of aluminum is inserted into a core 2. A winding 3 coated with a ceramic is wound on the bobbin 1. A mold releasing material 4 made of silicon is coated between the bobbin 1 and the core 2. A liquid glass 5 is impregnated with the winding, heated at 400 deg.C in a furnace for 1hr, and then cooled in the atmosphere. Thus, the allowable temperature of the coil can be raised.

3. 发明专利

JPS6087474A HEAD POSITIONING DEVICE 失效
公开(公告)号：JPS6087474A
公开(公告)日：1985-05-17
申请号：JP19426683
申请日：1983-10-19
申请人： HITACHI LTD
发明人： HIRANO YOSHIYUKI , SEO YOUSUKE , NAKAKOSHI KAZUO , CHIYUUMA AKIRA
IPC分类号： G11B21/02 , G11B21/08
摘要： PURPOSE:To obtain a head positioning device which moves linearly and is not effected by gravity by connecting a head and a coil through a mechanism for reversing of the direction of force such as a rack and pinion and a belt and pulley and balancing the weight. CONSTITUTION:When current is conducted to a coil 10, force is generated and the coil 10 moves along a coil guide 12. The movement is transmitted to a head rack 15 by a coil rack 13 and a pinion 14. As a result, a head 16 moves in the reverse direction to the coil along a head guide 17. At this time, tensile force is given by a spring 18 for eliminating play between the racks 13, 15 and the pinion 14.

4. 发明专利

JPS607659A MAGNETIC DISC DEVICE 失效
公开(公告)号：JPS607659A
公开(公告)日：1985-01-16
申请号：JP11482983
申请日：1983-06-24
申请人： HITACHI LTD
发明人： SEO YOUSUKE , HIRANO YOSHIYUKI , TAMURA TAKASHI
IPC分类号： G11B21/08 , G11B5/55 , G11B5/596 , G11B21/10 , G11B21/12
摘要： PURPOSE:To attain high speed accessing by providing the titled device with a means seeking tracks up to an objective track and executing track following servo function by a data track servo system after the completion of loading. CONSTITUTION:A head 2 is positioned by a scale 7 under unloading state until a seek instruction (c) is inputted after reading/writing data. When the seek instruction (c) is inputted, a difference counter 21 is set up and the number (j) of seek tracks obtained before several tracks from the objective track is supplied to the counter 21 by a track cross pulse generated from a track cross pulse generator 28 on the basis of a signal (f) from the scale 7. A speed curve generator 22 forms an objective speed curve in accordance with the number (j) of seek tracks, and the difference between the objective speed curve and a detected by a speed detecting circuit 25 is led to a servo control circuit 23 to control the moving speed of the head.

5. 发明专利

JPS60157779A SERVO WRITE DEVICE OF FLEXIBLE DISC 失效
公开(公告)号：JPS60157779A
公开(公告)日：1985-08-19
申请号：JP1192884
申请日：1984-01-27
申请人： HITACHI LTD
发明人： SEO YOUSUKE , HIRANO YOSHIYUKI , AOI MOTOI
IPC分类号： G11B17/34 , G11B5/596 , G11B21/10
摘要： PURPOSE:To obtain an efficient servo write device capable of accurate servo write even for flexible mediums by providing a frame for fixing a flexible disc. CONSTITUTION:A flexible medium 11 has the outside circumference fixed by a frame 8, which is held by an air bearing 9, and a retaining ring 12 and has the inside circumference fixed to a spindle 7 by a retaining ring 13. The disc is rorated by the spindle, and the frame 8 and the medium 11 are rotated as one body. The air spindle is so constituted that a force is given in three directions by supply of compresed air from the directions of arrows and the frame 8 is floated stably by air as shown by the figure. A clock head and a write head can be separated optionally, and flutter, is prevented by fixing the flexible disc to the frame 8, and therefore, the effect of accurate servo write is obtained.

6. 发明专利

JPS59154676A Magnetic disk device 失效
标题翻译：磁盘设备
公开(公告)号：JPS59154676A
公开(公告)日：1984-09-03
申请号：JP2755883
申请日：1983-02-23
申请人： Hitachi Ltd
发明人： SEO YOUSUKE , NISHIYAMA NOBUMASA
IPC分类号： G11B21/10 , G11B5/55 , G11B25/04
CPC分类号： G11B5/5526
摘要： PURPOSE:To reduce position error generated by temperature difference between disk by detecting temperature difference between disks by a thermocouple, heating a head arm in response to an electromotive force produced in the thermocouple and controlling the amount of thermal expansion. CONSTITUTION:An electromotive force in response to the temperature difference of a space between disks, e.g., D1, and D2, is generated from different kinds of metals 11 and 12 constituting the thermocouple. The constitution is that a high gain differential amplifier 14 and a current drive circuit 15 receiving this potential difference flow a current in response to the temperature difference to a heater fitted to an arm at a low temperature side. When the heater 16 fitted to the arm is heated, a heater section attains automatic compensation by a heat deprived by wind or the like being balanced with the heating at the same time. The positioning error due to temperature difference is compensated by simple constitution in this way, allowing to improve the positioning accuracy.
摘要翻译：目的：为了通过检测热电偶之间的温度差来检测盘之间的温度差产生的位置误差，根据热电偶产生的电动势加热头臂并控制热膨胀量。构成：响应于盘之间的空间（例如D1和D2）的温度差的电动势由构成热电偶的不同种类的金属11和12产生。其结构是，接收该电位差的高增益差分放大器14和电流驱动电路15响应于温度差流过安装在低温侧的臂上的加热器的电流。当装配到臂上的加热器16被加热时，加热器部分通过风等等被同时加热平衡的热量实现自动补偿。由于温差的定位误差由这样简单的结构补偿，可以提高定位精度。

7. 发明专利

JPS5933673A Servo controlling method of magnetic head 失效
标题翻译：磁头伺服控制方法
公开(公告)号：JPS5933673A
公开(公告)日：1984-02-23
申请号：JP14111482
申请日：1982-08-16
申请人： Hitachi Ltd
发明人： SEO YOUSUKE , NAKABAYASHI KAZUYOSHI
IPC分类号： G05D3/12 , G11B5/596 , G11B21/08
CPC分类号： G11B5/596
摘要： PURPOSE:To realize a high-speed access with a simple circuit constitution, by setting a deceleration curve at a low level in response to the deceleration/ acceleration speed and then resetting the low deceleration curve to its original curve after a fixed time when the moving speed reaches a prescribed level. CONSTITUTION:The signal given from a circuit 10 which generates the voltage equivalent to the distance up to a target point is set at the set deceleration level 12 when switches 4 and 7 are opened with switches 5 and 6 closed respectively. The switch 4, if closed, functions to reduce the level 12 by the signal given from a circuit 9 which generates the voltage equivalent to the deceleration/acceleration corresponding to a deceleration curve. Therefore the deceleration value is reset to the set value of speed 2 by opening the switch 4 with a signal 8 showing that the level 12 has reached a point B'. In such a way, an overshoot is reduced to suppress a sudden change of current. Thus a high-speed access is possible with a simple circuit constitution.
摘要翻译：目的：通过简单的电路结构实现高速访问，通过根据减速/加速度设定减速曲线为低电平，然后在移动的固定时间后将低减速曲线复位为原始曲线速度达到规定水平。构成：当开关4和7分别断开，开关5和6分别闭合时，从电路10产生相当于距离目标点的距离的信号被设定在设定的减速度级12。开关4如果闭合，起到通过由电路9给出的信号来减小电平12，该信号产生与减速曲线对应的减速/加速度相当的电压。因此，通过用显示电平12达到点B'的信号8打开开关4，将减速度值复位到速度2的设定值。以这种方式，减小了过冲以抑制电流的突然变化。因此，以简单的电路结构可以实现高速访问。

8. 发明专利

JPS60136073A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS60136073A
公开(公告)日：1985-07-19
申请号：JP24201183
申请日：1983-12-23
申请人： HITACHI LTD
发明人： HIRANO YOSHIYUKI , SEO YOUSUKE , OKUWAKI TOYOJI , KATOU KATSUHIKO , TAMURA TAKASHI
IPC分类号： G11B21/21 , G11B5/012 , G11B5/48 , G11B5/58 , G11B19/04 , G11B21/12
摘要： PURPOSE:To reduce extremely the degree of danger of a head crush accident by using a means which changes the spacing between a magnetic head and a magnetic disk within a range where the buoyancy of the head is produced by the dynamic pressure of a floating element. CONSTITUTION:When a magnetic head is floating, the length L between a slider 2 and the tip of a guide arm 6 is set at 30mm. with application of voltage. Thus the deflection amount of a plate spring is reduced by about 3mm. at a slider part 2, and the spacing is increased to 0.7mum. When a record/reproduction (R/W) instruction for information is delivered from a computer main body (not shown in the diagram), a positioning device 13 is actuated by a positioning device control circuit 11 with a command of a controller 10. Then the slider 2 is positioned at a desired track. Furthermore, a piezoelement 7 is driven simultaneously with the start of a positioning action. Thus the spacing is reduced. Then the end of the positioning action is informed to the controller 10, and an R/W action is executed by an R/W circuit 14.

9. 发明专利

JPS60101778A POSITIONING SYSTEM FOR MAGNETIC HEAD 失效
公开(公告)号：JPS60101778A
公开(公告)日：1985-06-05
申请号：JP20872383
申请日：1983-11-07
申请人： HITACHI LTD
发明人： SEO YOUSUKE , HIRANO YOSHIYUKI , TAMURA TAKASHI
IPC分类号： G11B21/10 , G11B5/596
摘要： PURPOSE:To position separately a magnetic head from a track follow-up signal without limiting a servo band by utilizing a scale on which relative position variation between the fixed part and magnetic head of a magnetic disk device is known. CONSTITUTION:The position error signal of a servo head from and the position signal of a carriage based upon the scale for the relative position variation between the fixed part and magnetic head are supplied from amplifiers 11A and 11B respectively, passed through sample holding circuits 13A and 13B, and superposed one over another by an adding circuit 14 to generate a head position error signal from which the track follow-up signal is separated substantially without error. Then, a voice coil motor 17 which controls the head position is controlled through a servo compensating circuit 15, etc., to position the magnetic head by a sector servo system disk device without limiting the servo band by a sampling frequency.

10. 发明专利

JPS539504A MAGNETIC DISC TESTING APPARATUS 失效
公开(公告)号：JPS539504A
公开(公告)日：1978-01-28
申请号：JP8300776
申请日：1976-07-14
申请人： HITACHI LTD
发明人： HIRANO YOSHIYUKI , SEO YOUSUKE
IPC分类号： G01R33/12 , G01B21/30 , G11B5/84 , G11B19/00
摘要： PURPOSE:To shorten the time required for test by so controlling the apparatus that a disc stops in a home position.

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