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51. 发明专利

JPH01159825A MAGNETIC TAPE 失效
公开(公告)号：JPH01159825A
公开(公告)日：1989-06-22
申请号：JP31753187
申请日：1987-12-17
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO , SHIRAHATA RYUJI
IPC分类号： G11B5/73 , G11B5/735 , G11B5/738
摘要： PURPOSE:To obviate generation of transfer in the coiled state of a magnetic tape by forming a layer consisting of a superconducting material in the tape layer. CONSTITUTION:The superconducting layer 13 consists of any among an oxide superconducting material, simple substance metallic superconducting material and alloy superconducting material and is formed between a base film 11 and a magnetic layer 12 by coating with a binder or vapor deposition or sputtering. The superconducting layer 13 always exists between the magnetic layers 12 and 12 adjacent in the lamination direction when this magnetic tape 10 is wound and laminated on a reel. The superconducting layer 13, therefore, shuts off the magnetic fluxes emitted from the magnetic layer by the Meissner effect. The generation of the transfer is thereby entirely prevented.

52. 发明专利

JPH01113953A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH01113953A
公开(公告)日：1989-05-02
申请号：JP27033887
申请日：1987-10-28
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO
IPC分类号： G11B17/32 , G11B17/34
摘要： PURPOSE:To obtain a firm and stable head touch by encircling a magnetic head with a surrounding wall, sucking air within the surrounding wall due to a lowering of the atmospheric pressure attending upon an increase of airflow speed and producing a negative pressure therein. CONSTITUTION:A partition frame 17 having the surrounding wall 16 surrounding all over a circle with the center of the magnetic head 12 is provided, and a space 19 surrounding the magnetic head 12 is formed by the partition frame 17 and a magnetic sheet 11. The surrounding wall 16 is positioned in an airflow rotating with the rotating magnetic sheet 11, and notches 20 are provided in such a position respectively that the airflow speed is changed and then the changed airflow speed is approximately the max. The airflow 1 generated with the rotation of the magnetic sheet 11 flows round along the outer periphery of the surrounding wall 16 of the partition frame 17, and the flow speed is increased to cause the lowering of the atmospheric pressure, so that the air is sucked out through the notches 20, resulting in the negative pressure in the space 19. By this method, the magnetic sheet 11 is sucked to be forcibly brought into contact with the magnetic head 12, thus obtaining the stable head touch.

53. 发明专利

JPS6430065A DOUBLE-SIDED RECORDING METHOD 失效
公开(公告)号：JPS6430065A
公开(公告)日：1989-01-31
申请号：JP18558787
申请日：1987-07-27
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO
IPC分类号： G11B17/32
摘要： PURPOSE:To instantaneously switch a recording face contactlessly with a floppy disk by inclining guide plates to generate negative or positive pressure, and attracting and energizing the floppy disk to either one of magnetic heads to record data on both sides of the floppy disk. CONSTITUTION:The guide plate 14 is arranged on the upstream side of one magnetic head 12 and the guide plate 15 is arranged on the downstream side of the other magnetic head 13. The guide plates 14, 15 are inclined to generate negative or positive pressure and the floppy disk 11 is attracted and energized to either one of the magnetic heads 12, 13 opposed by placing the disk 11 between them to record data on both the sides of the disk 11. Consequently, the recording faces can be instantaneously switched contactlessly with the floppy disk 11.

54. 发明专利

JPS6430063A DOUBLE-SIDED RECORDING METHOD 失效
公开(公告)号：JPS6430063A
公开(公告)日：1989-01-31
申请号：JP18558587
申请日：1987-07-27
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO
IPC分类号： G11B17/32
摘要： PURPOSE:To instantaneously switch a recording face contactlessly with a floppy disk by inclining guide plates to generate negative pressure and positive pressure, and attracting and energizing the floppy disk to either one of magnetic disks to record data on both sides of the floppy disk. CONSTITUTION:When the guide plates 14-17 are inclined so as to be approached to the rotating floppy disk 11 in a direction from the upstream side to the downstream side, positive pressure is generated among the guide plates 14-17 and the floppy disk 11. When the guide plates 14-17 are inclined so as to be separated from the rotating floppy disk 11 in the direction from the upstream side to the downstream side, negative pressure is generated among the guide plates 14-17 and the floppy disk 11. Thereby, positive pressure is generated in one face of the disk 11, negative pressure is generated on the other face and the floppy disk 11 is attracted or energized to either one of the magnetic heads 12, 13 opposed to both sides of the disk 11 to record data on both the sides of the disk 11. Consequently, the recording faces can be instantaneously switched contactlessly with the floppy disk 11.

55. 发明专利

JPS63106922A POLISHING DEVICE FOR MAGNETIC SHEET 失效
公开(公告)号：JPS63106922A
公开(公告)日：1988-05-12
申请号：JP25194286
申请日：1986-10-24
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO , SOEDA HARUO
IPC分类号： G11B5/84 , G11B5/74
摘要： PURPOSE:To prevent the re-adhesion of magnetic powder by making the side face f the downstream side of a scraper roughly vertical against the slide-contact surface for slide-contacting a magnetic sheet. CONSTITUTION:A magnetic sheet 1 rotates in the direction as indicated with an arrow a, and also, a sapphire chip 10 which becomes a scraper is attached to a base plate 3. The sapphire chip 10 is shaped like a prism in which a slide- contact surface 10a is about 0.3mm angle. Accordingly, an angle theta1 made by a side face 10b of the upstream side and a magnetic surface 1a, and an angle theta2 made by a side face 10c of the downstream side and the magnetic surface 1a become both 90 deg.. Also, a slanting groove 11 is formed on the side face 10c. In such a way, even if a magnetic lump of the magnetic surface 1a is scraped by the sapphire chip 10, the scraped magnetic powder drops downward naturally, and it does not occur that said powder is accumulated on the side face 10c.

56. 发明专利

JPS63103430A GRINDING DEVICE FOR MAGNETIC SHEET 失效
公开(公告)号：JPS63103430A
公开(公告)日：1988-05-09
申请号：JP24828086
申请日：1986-10-21
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO , SOEDA HARUO , SATO MASAMICHI , KUBO TAKASHI
IPC分类号： G11B5/84
摘要： PURPOSE:To surely perform burnishing, by inclining the side plane of a scraper on an upstream side by an angle

57. 发明专利

JPS6398888A CLEANING DEVICE FOR MAGNETIC SHEET 失效
公开(公告)号：JPS6398888A
公开(公告)日：1988-04-30
申请号：JP24406886
申请日：1986-10-16
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO
IPC分类号： G11B23/50
摘要： PURPOSE:To facilitate the removal of dust adhered on a magnetic sheet by using attracting force and pressing force by the action of a slide member provided near a magnetic head to bring a cleaning member into contact with the magnetic sheet. CONSTITUTION:When the magnetic sheet 11 is driven in a direction of an arrow at a high speed, the attraction force by a negative pressure at slopes 14a, 15a of head sliding members 14, 15 by the air flow and the pressing force by a positive pressure is caused on the slope face 17a of the head sliding member 17. Thus, the sheet 11 is stably slid to the magnetic head 13 and an excellent head touch is obtained. Since the sheet 11 is in contact with the cleaning member 16 fitted to the slope face 15a of the member 15, magnetic powder or dust is removed and dropout is prevented.

58. 发明专利

JPS6394408A INFORMATION SIGNAL RECORDING/REPRODUCING/ELIMINATING METHOD AND ITS COMPOUND MAGNETIC HEAD 失效
公开(公告)号：JPS6394408A
公开(公告)日：1988-04-25
申请号：JP23811686
申请日：1986-10-08
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO
IPC分类号： G11B5/265 , G11B5/024
摘要： PURPOSE:To record, reproduce and eliminate satisfactorily an information signal by recording the information signal with a first head in which a scanning width is narrower than the width of a guard band, reproducing it with a second head width than the width of the guard bank and causing an eliminating current to flow to both heads and eliminating the information signal. CONSTITUTION:On tracks T1 and T2 for the picture signal of a magnetic disk 200, gap parts 111 and 112 of a thin film head 110 for the picture signal are positioned. In this condition, the disk 200 is rotated, a current is caused to flow at the coil of respective gap parts 111 and 112 of the head 110 and the picture signal is recorded. At this time, a guard band G is formed between both tracks T1 and T2. In order to reproduce the picture signal, the same position condition as recording is obtained and the picture signal is obtained from tracks T1 and T2 by the gap parts 111 and 112. At the time of the recording, execution is performed with the head in which the scanning width is narrower than the width of the band G, and at the time of the reproducing, execution is performed with the head wider than the width of the band G. Further, at the time of eliminating, the eliminating is executed without fail by causing an eliminating current to flow at both heads.

59. 发明专利

JPS6292160A REGULATING PLATE 失效
公开(公告)号：JPS6292160A
公开(公告)日：1987-04-27
申请号：JP22995085
申请日：1985-10-17
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO
IPC分类号： G11B17/32 , G11B17/34
摘要： PURPOSE:To prevent the generation of a flaw by providing a through hole connected to a negative pressure region at the back side in the magnetic sheet turning direction of a magnetic head between a regulating plate and a magnetic sheet so as to decrease a sliding resistance between the sheet and the regulating plate, thereby reducing a load torque. CONSTITUTION:The backward side of the magnetic head 2 far away from a contact point in the magnetic sheet turning direction rear side has a negative pressure region where the pressure is apt to be lower than the atmospheric pressure by the relation of the air flow, but since the through hole 4 connected to the negative pressure region is provided to the regulating plate 3, the air flows from the through hole 4, the negative pressure is released and the pressure is equal to the atmospheric pressure. Thus, the magnetic sheet 1 is not attracted by the regulated plate 3 nor slided, and the slide resistance is not increased to reduce the load torque. Further, the generation of flaw owing to the contact between the regulating plate 3 and the magnetic sheet 1 is suppressed as well.

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