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121. 发明专利

JPS61276111A HEAD POSITION DETECTING SYSTEM 失效
公开(公告)号：JPS61276111A
公开(公告)日：1986-12-06
申请号：JP11853185
申请日：1985-05-30
申请人： FUJITSU LTD
发明人： MIZOSHITA YOSHIBUMI , UENO TAKAHISA
IPC分类号： G11B5/596 , G11B21/10
摘要： PURPOSE:To improve the head positioning accuracy by changing the potential of a reference voltage signal as the time passes from the prescribed offset value and therefore avoiding the output of a comparison pulse due to fine noises, etc. CONSTITUTION:The two detection pulse signals obtained from state transitions 25 and 26 have different amplitudes in case the center of a servo head 1 is not coincident with a boundary line 24 between two adjacent servo tracks 21 (position B). The offset value set by an offset supply means 11 is given to a reference voltage signal generating part 3 in the form of an offset. Then the part 3 produces a reference voltage signal having its potential which rises linearly over said offset value. This reference voltage signal is compared with said two detection pulse signals at a comparison part 5. Thus the comparison output pulses are produced and sent to gate circuits 6 and 7 for a period during which the detection pulse signals are higher than the reference voltage signal. Both circuits 6 and 7 detect the comparison output pulse and delivers two types of count pulses to a counter 8. The counter 8 delivers the difference between both count pulses in the form of the position information.

122. 发明专利

JPS6129471A Control method of magnetic head positioning speed 失效
标题翻译：磁头定位速度控制方法
公开(公告)号：JPS6129471A
公开(公告)日：1986-02-10
申请号：JP15074184
申请日：1984-07-19
申请人： Fujitsu Ltd
发明人： MIZOSHITA YOSHIBUMI , HASEGAWA SUSUMU
IPC分类号： G05D3/12 , G11B5/55 , G11B21/08
CPC分类号： G11B5/5526
摘要： PURPOSE:To demodulate an highly precise and wide band speed signal without adding an A/D convertor by actuating a switch circuit in a condition that the difference between a target moving speed and actual moving speed in a magnetic head is less than the prescribed value to actuate a feedback circuit performing correction of actual moving speed. CONSTITUTION:The difference between target moving speed and present moving speed corresponding to a position error signal of the magnetic head 1 is detected by a digital subtraction circuit 7', and then, conditon of an electromagnetic actuator 9 driven by the detected value is discriminated. When exciting electric current discriminates saturated condition through a discrimination circuit 13 of the actuator 9, a switch circuit 14 is connected by switching with the broken line's side, and when unsaturated condition is discriminated, it is connected by switching to full line's side. Therefore, at the time of saturated condition, the difference between the present moving speed digital signal and the target moving speed digital signal is directly calculated, so that response can be made speedily. Further, at the time of unsaturated condition, speed control of the head 1 can be performed by calculating the difference of highly precise and wide band of the present and target moving digital signals without adding a high speed A/D convertor.
摘要翻译：目的：通过在磁头中的目标移动速度与实际移动速度之间的差小于规定值的情况下致动开关电路来增加A / D转换器，以解调高精度和宽带速度信号，启动执行实际移动速度的校正的反馈电路。构成：通过数字减法电路7'检测与磁头1的位置误差信号对应的目标移动速度与当前移动速度的差异，然后鉴别由检测值驱动的电磁致动器9的状态。当激励电流通过致动器9的识别电路13鉴别饱和状态时，开关电路14通过与虚线侧的切换连接，并且当判别不饱和条件时，通过切换到全线侧来连接。因此，在饱和状态下，直接计算出当前移动速度数字信号与目标移动速度数字信号之间的差异，从而能够快速响应。此外，在不饱和状态下，可以通过在不添加高速A / D转换器的情况下计算当前和目标移动数字信号的高精度和宽带的差异来执行头1的速度控制。

123. 发明专利

JPS60157778A HEAD ACTUATOR OF MAGNETIC DISC DEVICE 失效
公开(公告)号：JPS60157778A
公开(公告)日：1985-08-19
申请号：JP1228784
申请日：1984-01-25
申请人： FUJITSU LTD
发明人： MIZOSHITA YOSHIBUMI
IPC分类号： H02K33/18 , G11B5/55 , G11B21/02
摘要： PURPOSE:To make high-precision and high-speed access operations of a magnetic head possible by giving a simple structure, which has a high rigidity and is made very light-weight, to a movable part, which supports a magnetic head function part, as the whole. CONSTITUTION:A carriage body 21 of a head actuator has a plane plate-shaped structure which uses a ceramic material or the like and is provided with punched holes 23, and the carriage body 21 supports directly a movable coil 27, and a bearing for straight movement is provided in the side of a fixed magnetic circuit 31, and therefore, the carriage body 21 has a small-sized structure where the mass is reduced considerably and the rigidity (especially, in the pitching direction) is improved. Consequently, when the carriage body 21 having this constitution and the connected movable coil 27 are guided by a bearing 36 provided in the fixed magnetic circuit 31 and are inserted into the corresponding fixed magnetic circuit 31 to constitute a linear motor between the fixed magnetic circuit 31 and the carriage body 21, the movable including the carriage body 21 is moved straightly in a higher speed than a conventional constitution, and each magnetic head 26 is positioned to a selected track position on a corresponding magnetic disc 37 with a high precision.

124. 发明专利

JPS59119421A Sample value control type positioning system 失效
标题翻译：样本值控制类型定位系统
公开(公告)号：JPS59119421A
公开(公告)日：1984-07-10
申请号：JP22837882
申请日：1982-12-27
申请人： Fujitsu Ltd
发明人： HASEGAWA SUSUMU , MIZOSHITA YOSHIBUMI
IPC分类号： G05D3/12 , G05B19/39 , G05B21/02 , G11B21/10
CPC分类号： G05B19/39 , G05B2219/42104
摘要： PURPOSE:To execute positioning to a target position without causing an overshoot by switching a contrl mode to a position control mode from a speed control mode at a position prescribed in advance. CONSTITUTION:A mode switching controlling circuit 3 moves a magnetic head 6 being a movable element to a position Xc prescribed in advance along a command speed CV. That is to say, until the head reaches the position Xc, the mode is a speed control mode. Subsequently, when the head arrives at the position Xc, the speed control mode is switched to a position control mode. In this position control mode, a command position signal from a position instructing circuit 2 is shifted to a target position signal in accordance with a period DELTAt of a sample control signal, and a position error signal corresponding to it is outputted from the controlling circuit 3. In this way, positioning can be executed to a target position without causing an overshoot.
摘要翻译：目的：通过在预先规定的位置处的速度控制模式将停车模式切换到位置控制模式，来执行定位到目标位置而不引起过冲。构成：模式切换控制电路3将作为可动元件的磁头6沿着指令速度CV预先规定的位置Xc移动。也就是说，直到头部到达位置Xc为止，模式是速度控制模式。随后，当磁头到达位置Xc时，速度控制模式切换到位置控制模式。在该位置控制模式中，来自位置指示电路2的指令位置信号根据采样控制信号的周期DELTAt移动到目标位置信号，并且从控制电路3输出与其对应的位置误差信号以这种方式，可以对目标位置执行定位而不引起过冲。

125. 发明专利

JPS58201113A Positioning servo system of moving body 失效
标题翻译：定位伺服系统的移动体
公开(公告)号：JPS58201113A
公开(公告)日：1983-11-22
申请号：JP8554382
申请日：1982-05-20
申请人： Fujitsu Ltd
发明人： HASEGAWA SUSUMU , MIZOSHITA YOSHIBUMI
IPC分类号： G05D3/12 , G05D3/14
CPC分类号： G05D3/14
摘要： PURPOSE:To reduce the extent of an overshoot by making corrections so that a component signal of movable body driving acceleration approximates the curve drawn by the time constant determined by the insuctance and resistance of a moving body driving mechanism. CONSTITUTION:A signal generating function part 3 generates a feed-forward signal on the basis of a target track signal supplied from a controller 1 to a digital arithmetic processing part 2. The signal is inputted to one input of a power amplifier 4, and also passed through a coil inductance compensating function part 10 and integrated twice by integrating function parts 5 and 6; and a position error signal obtained from a demodulator 7 is added by an adder 11, whose output is inputted to the other terminal of the power amplifier 4 through an analog compensator 8. A voice coil motor 9 is driven by the output of the amplifier 4. A coil inductance compensating function part 10 corrects the feedforward signal so that the signal approximates a time constant curve determined by the coil inductance and resistance. Thus, the extent of the overshoot is minimized.
摘要翻译：目的：通过进行修正来减小过冲的程度，使得可移动体驱动加速度的分量信号接近于由移动体驱动机构的阻抗和阻力确定的时间常数所绘制的曲线。构成：信号生成功能部分3基于从控制器1提供给数字运算处理部分2的目标轨道信号产生前馈信号。该信号被输入到功率放大器4的一个输入端，并且还通过线圈电感补偿功能部件10并通过集成功能部件5和6集成两次; 并且由解调器7获得的位置误差信号由加法器11相加，加法器11的输出通过模拟补偿器8输入到功率放大器4的另一端。音圈电机9由放大器4的输出驱动线圈电感补偿功能部分10校正前馈信号，使得信号接近由线圈电感和电阻确定的时间常数曲线。因此，过冲的程度被最小化。

126. 发明专利

JPS583165A MAGNETIC DISC DEVICE 失效
公开(公告)号：JPS583165A
公开(公告)日：1983-01-08
申请号：JP10109281
申请日：1981-06-29
申请人： FUJITSU LTD
发明人： HASEGAWA SUSUMU , MIZOSHITA YOSHIBUMI
IPC分类号： G11B33/14 , G12B15/02
摘要： PURPOSE:To make effective cooling, by circulating the air in the device through a heat exchanger, in a magnetic device of an tightly enclosed construction. CONSTITUTION:The air in a disc device warmed with the generated heat due to the rotation of a disc 2 is delivered to a heat exchanger 6 through a duct 5 with an air flowing outlet 8 provided in the vicinity of the external circumference of the disc of an enclosure 1 accompanied with the disc. On the other hand, the external air is drawn in with a fan 7 located aside the heat exchanger and led into the heat exchanger 6. The air in the device taking its heat and cooled with the external air is returned in the disc enclosure from an air flowing inlet 9. Thus, the temperature rise in the disc device is suppressed to a prescribed temperature and the value is depending on the performance of the heat exchanger 6.

127. 发明专利

JPS57191880A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS57191880A
公开(公告)日：1982-11-25
申请号：JP7765481
申请日：1981-05-22
申请人： FUJITSU LTD
发明人： MIZOSHITA YOSHIBUMI , UEMATSU YUKIHIRO
IPC分类号： G11B19/20 , G11B21/02 , G11B23/00 , G11B25/04 , G11B33/14
摘要： PURPOSE:To eliminate evil effect of the heat generated locally and the dust to a magnetic disk, by setting a driving motor if a rocking member for access of the magnetic head at the outside of a container of the magnetic disk and then sealing the driving shaft by means of a magnetic fluid. CONSTITUTION:The rocking shaft 12 of a rocking arm 11 of a rotary member for access of a magnetic head and piercing through a basement 14 of a container that stores hermetically a magnetic disk, etc. is sealed by means of a magnetic fluid. The shaft 12 is driven via a driving motor 18 which is provided outside the container set outside the basement 14. Thus the heat which is locally generated by the motor 18 is not transmitted into the container. As a result, the evil effect due to the heat caused locally, the dust, etc. can be assuredly prevented for the magnetic disk.

128. 发明专利

JPS5625266A POSITIONING SYSTEM FOR MAGNETIC HEAD 失效
公开(公告)号：JPS5625266A
公开(公告)日：1981-03-11
申请号：JP9941179
申请日：1979-08-06
申请人： FUJITSU LTD
发明人： MIZOSHITA YOSHIBUMI
IPC分类号： G11B5/596 , G11B5/55 , G11B21/08 , G11B21/10
摘要： PURPOSE:To expand a recording area without deteriorating positioning precision while obtaining a broad-band position signal, by generating an equivalent position signal from a few pieces of position information and the position signal of a speed detector. CONSTITUTION:Position information write area 5 is reduced and head actuator 13 is fitted with speed detector 14. The gain of the speed signal of detector 14 is adjusted by coefficient unit 17 and the gain of the position signal of sample holding circuit 12, on the other hand, is also adjusted by coefficient unit 17 to equalize voltage levels of both the signals. Then, both the signals are added together by adder 18, whose output is input to primary delay circuit 19. Circuit 19, having its time constant T set equal to ratio Ax/Ay of position gain Ay of coefficient unit 17 to Ax of 16, integrate the high frequency component of the sum signal properly. Therefore, the circuit outputs an equivalent position signal consisting of the low frequency component of the position signal and a high frequency component obtained by integrating the speed signal. this signal is applied to actuator 13 by way of controller 20 and power amplifier 21 to move head 11 to a desired position.

129. 发明专利

JPS5625265A SPEED SIGNAL DEMODULATOR 失效
公开(公告)号：JPS5625265A
公开(公告)日：1981-03-11
申请号：JP9941079
申请日：1979-08-06
申请人： FUJITSU LTD
发明人： MIZOSHITA YOSHIBUMI
IPC分类号： G11B21/08 , G11B5/55
摘要： PURPOSE:To obtain an accurate speed signal with less noises by changing polarities of the speed signal in accordance with the polarity of a two-phase analog signal, shifted by a one-half pitch, obtained from position information detected by a magnetic head. CONSTITUTION:Position information read by the servo magnetic head is converted into an analog signal and position signal A and position signal B obtained by delaying it by a one-half pitch are supplied to inputs 1 and 2 respectively. Signals A and B are converted by differentiating circuits 3 and 4 into speed signals, which are input to analog switch 5. To this switch 5, linear-region polarity decision signal +A, -A, +B, and -B that express the polarity of the linear part of the position signal are supplied and under based upon their logic levels, the speed signals are obtained and input to the positive and negative terminals of polarity change-over circuit 14 to generate position differential signals in phase and out of phase with the speed signal. Then, the high-frequency component of the speed signal obtained by inputting the integral value of driving-motor electric current to input 20 and the low-frequency component of the position differential signal are mixed by operarional amplifier 21, so that the accurate noise-free speed signal will appear at its output 22.

130. 发明专利

JPS5597064A CONTROL SYSTEM FOR HEAD POSITIONING 失效
公开(公告)号：JPS5597064A
公开(公告)日：1980-07-23
申请号：JP524679
申请日：1979-01-19
申请人： FUJITSU LTD
发明人： MIZOSHITA YOSHIBUMI
IPC分类号： G11B21/10
摘要： PURPOSE:To secure the equivalent negation for the bending force which is caused to the spring component according to the displacement of the arm by connecting the arm containing the head directly to the mobile substance of the electromagnetic working element and then giving the control to the driving current to be applied to the working element in accordance with the displacement of the arm. CONSTITUTION:Servo information 12 recorded on magnetic disk medium 11 is read out via head 1 and then demodulated through demodulator circuit 13 thus to obtain the position signal. Based on this position signal, voice coil motor 4 is driven by controller 14 and via amplifier 21 to perform the positioning of head 1. Then up- down counter 18 is provided to indicate the position of head 1 and then to count the position signals sent from controller 14. The position where no bending occurs is memorized previously in controller 14, and thus reset signal 17 is supplied to counter 18 in case head 1 is at the position mentioned above. Thus the bending force of the spring can be negated equivalently by giving the control to the driving current which recognizes previously the position of head 1 and flows the bending force caused in accordance with the displacement of the arm to motor 4.

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