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1. 发明专利

JPS60157706A FLOPPY DISK DEVICE 失效
公开(公告)号：JPS60157706A
公开(公告)日：1985-08-19
申请号：JP1196884
申请日：1984-01-27
申请人： HITACHI LTD
发明人： KUROSAWA YUUJI , SHIRAISHI KAZUHISA , CHIYUUMA AKIRA , NAKAKOSHI KAZUO
IPC分类号： G11B5/09 , G11B20/10
摘要： PURPOSE:To obtain a floppy disk device which can prevent the generation of waveform distortions, by changing the rise and fall timings of the write data and therefore deleting the effect of an erasion current of an erasion core. CONSTITUTION:If the output of a flip-flop 2 is set at level ''LOW'' like a writing pattern (k), the write data (a) appears as the rise write data (g) at the output of an AND gate 10. The data (g) is turned into the delay rise write data (h) with a rise time delay T3 given by a delay circuit 11. The data (h) is supplied to the input of the flip-flop 2 via an OR gate 12. Then the output of the flip-flop 2 is inverted like the pattern (k), and this pattern (k) is set at level ''HIGH''. In this case, a waveform appearing at an output terminal 8 of a reading circuit 7 has a small distortion like a read waveform (n) together with a small shift of the peak point.

2. 发明专利

JPS54131916A MAGNETIC RECORDING SYSTEM 失效
公开(公告)号：JPS54131916A
公开(公告)日：1979-10-13
申请号：JP3924478
申请日：1978-04-05
申请人： HITACHI LTD
发明人： CHIYUUMA AKIRA
IPC分类号： G11B20/10 , G11B5/09
摘要： PURPOSE:To achieve high density recording with a simple constitution by incorporating a write circuit in a rotary head part, sending the signal having been so modulated that DC components become zero through a rotary transformer and converting this to NRZ-I type and recording the same. CONSTITUTION:The write signal A is converted to the signal having no DC components by an inversion circuit 2, delay circuit 3 and modulation circuit 1 consisting of an AND gate 4 taking positive AND and AND gate 5 taking negative AND and this signal is supplied to the primary side of a rotary transformer 8. The signal induced in the secondary side of the rotary transformer 8 of the rotary head part is erased of the pulses on the negative side in a rectifier circuit 9 and flows write current to a magnetic head 12 through an NRZ-I conversion circuit 10. Hence, the current of a negative direction always flows after the current of a positive direction in the primary side of the rotary transformer 8 and no DC components are contained and therefore writing may be performed with high recording density by the use of the NRZ-I modulation system.

3. 发明专利

JPS549911A MAGNETIC RECORDING AND READING CIRCUIT 失效
公开(公告)号：JPS549911A
公开(公告)日：1979-01-25
申请号：JP7435477
申请日：1977-06-24
申请人： HITACHI LTD
发明人： CHIYUUMA AKIRA
IPC分类号： G11B20/14 , G11B5/09 , H03K5/00 , H03K5/1532
摘要： PURPOSE:To make compensation quantity optimum and increase recording density in data zone by determining the compensation quantity of a high frequency compensating circuit according to the results which have detected the resolution of magnetic recording signal and varying the compensation quantity according to the results thereof.

4. 发明专利

JPS56114054A TRANSMISSION SYSTEM OF MULTIPLEXED SIGNAL 失效
公开(公告)号：JPS56114054A
公开(公告)日：1981-09-08
申请号：JP1668880
申请日：1980-02-15
申请人： HITACHI LTD
发明人： TEZUKA YOUJIROU , CHIYUUMA AKIRA
IPC分类号： G06F3/06 , G06F13/14 , G11B20/10
摘要： PURPOSE:To realize an economical application of the common demodulator circuit in the system that transmits the multiplexed signal to a single controller from several memory devices, by transmitting the memory information via the same signal transmission line. CONSTITUTION:The selection signal C that selects the floppy disk device FDD22c incorporating no demodulator circuit is delivered from the floppy disk controller FDC1. In such case, the read signal (b) before demodulation of the FDD22c is put into the signal demodulator circuit 30 of the FDD22a incorporating a demodulator circuit and via the multiplexed signal transmission line A. On the other hand, the read signal (a) before demodulation is supplied to the FDC1 to complete the reading of the information. In such way, the circuit 30 of the FDD22a can be used in common to other FDDs.

5. 发明专利

JPS5545120A TAPE POSITION DETECTOR 失效
公开(公告)号：JPS5545120A
公开(公告)日：1980-03-29
申请号：JP11746578
申请日：1978-09-26
申请人： HITACHI LTD
发明人： CHIYUUMA AKIRA
IPC分类号： B65H20/32 , G11B15/58
摘要： PURPOSE:To improve reliability by a simple constitution by arranging a pressure- sensing conductive rubber sheet in the depth direction of a tape loop pulled in by negative pressure in the vacuum column of a tape driver. CONSTITUTION:Over tip 8 of a tape loop, atmospheric pressure P0 is applied on metallic foil 10 of rubber sheet 9, and load Pv is on the right side of rubber sheet 9, so that rubber sheet 9 will be applied with the pressure. Electric conduction is therefore caused between metallic foil 10, and terminals S1-S5. Under tip 8 of the tape loop, on the other hand, negative pressure Pv is applied on metallic foil 10 and the right side of rubber sheet 9 and no pressure is applied on rubber sheet 9, so that no conduction will be caused. As a result, a boundary between terminals in conduction and the others among S1-S8 represents tip position 8 of the tape loop and it can be accurately detected by a simple circuit constitution.

6. 发明专利

JPS51122416A WRITING CIRCUIT FOR HIGH DENSITY MAGNETIC STORAGE 失效
公开(公告)号：JPS51122416A
公开(公告)日：1976-10-26
申请号：JP4644775
申请日：1975-04-18
申请人： HITACHI LTD
发明人： KURIHARA SHIGERU , CHIYUUMA AKIRA
IPC分类号： G11B5/09 , G11B5/035
摘要： PURPOSE:To perform optimum recording by changing a writing current value according to an ambient temperature.

7. 发明专利

JPS6074116A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS6074116A
公开(公告)日：1985-04-26
申请号：JP18139283
申请日：1983-09-29
申请人： HITACHI LTD
发明人： MAEKAWA HIDEO , CHIYUUMA AKIRA
IPC分类号： G11B5/02 , G11B5/596 , G11B5/64 , G11B5/66
摘要： PURPOSE:To use exclusively a vertical magnetized layer for a data signal, and to increase a storage capacity by recording a servo-track signal in a horizontal magnetized layer, in a magnetic recording medium having the vertical magnetized layer and the horizontal magnetized layer. CONSTITUTION:A magnetic recording medium has a structure which has coated a horizontal magnetized layer 2 and a vertical magnetized layer 1 in this order, on a base body 3. Also, with respect to a bit width of the vertical magnetized layer 1, a bit width of the horizontal magnetized layer 2 is set to its ten times or so. When a current is made to flow to a coil 14 of a servo-head 13, a magnetic flux 17 is generated. The servo-head 13 is provided in the vicinity of a vertical recording magnetic head 4, and as for the head 13, a magnetic flux density of the magnetic flux 17 to the vertical magnetized layer 1 is made lower than that of a head 4. Accordingly, the magnetic flux 17 magnetizes the horizontal magnetized layer 2 without exerting an influence on the vertical magnetized layer 1. Also, in a gap 16 of the head 13, an azimuth angle theta is provided to the head 4. Accordingly, a data signal 8 of the layer 1 and a servo-track signal 18 of the layer 2 have the azimuth angle, a mutual interference of both of them can be prevented.

8. 发明专利

JPS5868221A ALIGNMENT METHOD AND ALIGNMENT DISK 失效
公开(公告)号：JPS5868221A
公开(公告)日：1983-04-23
申请号：JP16417581
申请日：1981-10-16
申请人： HITACHI LTD
发明人： CHIYUUMA AKIRA , MORIBE YOSHIHIRO
IPC分类号： G11B5/56 , G11B5/596 , G11B23/30
摘要： PURPOSE:To correct the position of a head accurately by reproducing signals of slightly different frequencies from a disk on which said signals are recorded while partially shifting in a circumferential direction at equal intervals at the inside and outside of an optional track on the magnetic disk. CONSTITUTION:In areas A and B having width W centering on positions which are at distance DELTAr/2 at the inside and outside of a track 4 at distance (r) from the center of a disk, signals having slightly different frequencies f0 and f0+DELTAf1 are recorded. Those areas A and B have differences DELTAT1 and DELTAT2 in recording time. When the signals are reproduced from the magnetic disk through a reproducing head 3 with width W, signals having the same level are produced from the parts DELTAT1 and DELTAT2, and a beat signal DELTAf1 with a minimum value DELTA is obtained from a part T1-DELTAT1 as far as the center of the reproducing head 3 coincides with the track 4 correctly. For example, the reproducing head is displaced to a side B, the minimum beat value is reduced to zero with VB>VA. Thus, the direction and extent of the shifting of the head 3 are judged and correction to a correct position is facilitated.

9. 发明专利

JPS56114148A ROTARY HEAD TYPE MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS56114148A
公开(公告)日：1981-09-08
申请号：JP1697180
申请日：1980-02-14
申请人： FUJITSU LTD , NIPPON SHIYUUHENKI KK , HITACHI LTD
发明人： MATSUSHIGE HIROMI , CHIYUUMA AKIRA , NAKAMURA YOSHIKAZU
IPC分类号： H04N5/7826 , G05D13/62 , G11B15/18 , G11B15/467
摘要： PURPOSE:To perform the tracking control with a high precision, by controlling the count operation period of the counter on a basis of the envelop waveform of the servo bit pulse read out by the rotary head. CONSTITUTION:After amplified, servo bit pulse 4 read out by rotary head 2 is corrected by the DGC circuit and is input to low-pass filter 17 and synchronizing detecting circuit 18. Envelopor waveform 11 of the servo bit pulse obtained from low-pass filter 17 is sliced by threshold circuit 19 to obtain pulse 6. Meanwhile, 2F signal 5 is detected by synchronizing detecting circuit 18. Further, clocks are counted in the period of pulse 6 by up/down counter 21, and this count direction is controlled by the 2F signal. Consequently, the output of counter 21 at the count end time is proportional to the slippage quantity between the scanning locus of rotary head 2 and the center position of data stripe. Therefore, if capstan motor 12 is controlled according to the output of counter 21, the tracking control is performed with a high precision.

10. 发明专利

JPS5622210A DAMAGE PREVENTING SYSTEM FOR MAGNETIC TAPE 失效
公开(公告)号：JPS5622210A
公开(公告)日：1981-03-02
申请号：JP9736979
申请日：1979-08-01
申请人： HITACHI LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： MITAMURA MASAHIRO , CHIYUUMA AKIRA , HOSOKAWA SHIGEFUMI , IIJIMA TETSUO
IPC分类号： G11B5/41 , G11B5/455 , G11B5/52 , G11B15/61
摘要： PURPOSE:Not only to minimize the damage of the magnetic tape but to eliminate the effect of variance of the rotor motor itself, by detecting the increment of the driving current of the rotor motor for rotary head and then driving the rotary head eleansing mechanism. CONSTITUTION:Magnetic tape floating air jetting groove 10 is provided around rotary head 9 buried into rotor 2. Thus the air is jetted out during the recording and reproducing to make magnetic tape 8 float sufficiently above the surface of rotary head 9. In such constitution, if the dust sticks to head 9, a sufficient floating gap cannot be obtained at the recording and reproducing time. As a result, tape 8 touches head 9 to increase the current of motor 3. Accordingly, detecting circuit 5 detects the current difference of a certain level or more between pasure and reproduction modes, and then head cleansing mechanism driving circuit 7 is started to cleanse head 9. Thus the damage of the magnetic tape can be prevented.

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