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11. 发明专利

JPH0118485B2 失效
公开(公告)号：JPH0118485B2
公开(公告)日：1989-04-06
申请号：JP16093781
申请日：1981-10-12
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： HATAKEYAMA IWAO
IPC分类号： G11B5/00 , G11B5/02

12. 发明专利

JPS6464152A MAGNETO-OPTICAL RECORDING SYSTEM 失效
公开(公告)号：JPS6464152A
公开(公告)日：1989-03-10
申请号：JP12106487
申请日：1987-05-20
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： IIJIMA TETSUO , ISHII OSAMU , HATAKEYAMA IWAO
IPC分类号： G11B11/10 , G11B5/02 , G11B11/105
摘要： PURPOSE:To decrease the number of components, and also, to contrive the reduction of an operation margin, and a design margin of components, by constituting a reference layer so as to always have a stable residual magnetized state in one direction at a room temperature. CONSTITUTION:A recording medium 1 is constituted of a memory layer 2 and a reference layer 3'. The layer 3' is always magnetized upward at a room temperature. In case of writing newly a level '0' to the layer 2, optical power is applied to a medium 1 under a bias magnetic field 6' by a bias magnetic field applying magnet 6, and only the layer 2 is set to a Curie temperature Tc or below. In this case, the first upward magnetized state of the layer 3' is reserved, and the upward magnetization is guided to the layer 2. Subsequently, in case of writing newly a level '1' to the layer 2, optical power is applied to the medium 1 under a magnetic field 6' and the layer 2 is set to the Tc or above. In this case, the layer 3' becomes the downward magnetization, and in the cooling process, the layer 2 also becomes the downward magnetization. The downward magnetization of the layer 3' returns to the upward magnetization, when the influence by the magnetic field 6' becomes small together with the traveling of the medium 1.

13. 发明专利

JPS63283006A FORMING METHOD FOR NEW CREATION SITE 失效
公开(公告)号：JPS63283006A
公开(公告)日：1988-11-18
申请号：JP11751687
申请日：1987-05-14
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： ISHII OSAMU , NONAKA KOTARO , UEMATSU SHINJI , HATAKEYAMA IWAO
IPC分类号： G11C11/14 , G11C19/08 , H01F41/14
摘要： PURPOSE:To control a new creation site or a magnetic field with good reproducibility by ion implanting in high concentration to the small area on the surface of a magnetic unit by an ion beam implanting method. CONSTITUTION:High concentration ions are implanted to the small area on the surface of a magnetic unit by an ion beam implanting method. At least one type or more of He, B, H, Au, Ga, Si, Be, Ar, Ne, Xe, Ge are used as ions. A magnetic unit is of film state, has large magnetic anisotropy in a perpendicular direction to the surface, and its magnetization is directed in the perpendicular direction. The magnetic unit is made of a perpendicularly magnetized film of YIG, GIG, or rare earth elements or transition metal alloy, and the ion beam implanting method is a converging ion beam implanting method. Thus, a new creation site or a magnetic field is controlled with good reproducibility.

14. 发明专利

JPS63273288A HUB FOR OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPS63273288A
公开(公告)日：1988-11-10
申请号：JP10805887
申请日：1987-05-01
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YOSHIZAWA TAKASHI , HATAKEYAMA IWAO
IPC分类号： G11B23/00 , G11B7/24
摘要： PURPOSE:To realize hub bonding with high centering accuracy for an optical recording medium substrate, by providing a flexible positioning reference part to be fitted in the center hole of the medium substrate. CONSTITUTION:On a hub member 2, a positioning reference part 7 with superior concentricity with the center hole is provided. By bonding the reference part 7 as fitting in the center hole 5 of the optical recording medium substrate, an optical recording medium having a hub with high accuracy can be manufactured without using a specific jig. And the positioning reference part 7 provided in the hub is structured flexibly. In other words, since a certain amount of dispersion is generated in the sizes of the center hole 5 of the medium substrate and the positioning reference part 7 of the hub member in a manufacturing process, by forming the diameter of the reference part 7 a little larger than that of the center hole 5 of the medium substrate, and fitting both components 7 and 5, compression stress is generated in the medium substrate 1, and when a plastic substrate is used, it causes double refraction, therefore, the positioning reference part 7 provided in the hub 2 is structured flexibly, and thereby, the generation of the stress due to fitting can be reduced remarkably.

15. 发明专利

JPS63253503A PERPENDICULAR MAGNETIC FIELD IMPRESSING DEVICE 失效
公开(公告)号：JPS63253503A
公开(公告)日：1988-10-20
申请号：JP8715487
申请日：1987-04-10
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： ISHII OSAMU , HATAKEYAMA IWAO
IPC分类号： G11B5/02 , G11B5/127
摘要： PURPOSE:To substantially obviate a decrease in a perpendicular magnetic component and to decrease eddy current loss by using a multi-layered structural body consisting of thin magnetic films and nonmagnetic films having an insulating characteristic as a magnetic pole and disposing the magnetic pole in such a manner that a horizontal magnetic field is perpendicular to the multi-layered films of the multi-layered structural body. CONSTITUTION:The magnetic pole consisting of the multi-layered structure is disposed to a perpendicularly magnetized medium 5. This multi-layered structural body is laminated with plural layers of the soft magnetic films 1 and the nonmagnetic layers 2. The multi-layered films of this multi-layered structural body face the perpendicularly magnetized medium 5. A coil 3 is wound around the magnetic pole consisting of the multi-layered structural body. The soft magnetic films 1 are formed of amorphous Zr-Co and the nonmagnetic layers of SiO2 by a sputtering method. The horizontal magnetic field 4 is impressed to the multi-layered film planes of unidirectional multi-layered structural body so that the film planes are held perpendicular to the horizontal magnetic field. A self-demagnetizing field acts in the direction perpendicular to the film plane and the inclination of a spin in the direction HM when a DC magnetic field HM is applied to the films is suppressed and, therefore, the perpendicular magnetic field component is hardly decreased. Since the magnetic films are thin, the eddy current loss is decreased.

16. 发明专利

JPS63249952A MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPS63249952A
公开(公告)日：1988-10-17
申请号：JP8423987
申请日：1987-04-06
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YAMAMOTO MANABU , HARA SHINJI , HATAKEYAMA IWAO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To make the switching of the polarity of an external magnetic field unnecessary and to perform the rise of an erasing operation at high speed, by arranging a second perpendicularly magnetized film having the Curie temperature higher than that of a first perpendicularly magnetized film and magnetized uniformly at a part adjacently to the first perpendicularly magnetized film. CONSTITUTION:The second perpendicularly magnetized film 7 is formed adjacently to the first perpendicularly magnetized film 2 that is an information recording carrier. The second perpendicularly magnetized film 7 is magnetized uniformly, and always supplies a perpendicular magnetic field H7 to a magneto-optical recording medium. The recording of information is performed by lowering a coercive force Hc due to the temperature rise of the medium by photoirradiation, and arranging it in a direction of an applied magnetic field Hw'. At the time of erasure, the inversion of magnetization is performed by the magnetic field H7 supplied from the second perpendicularly magnetized film 7 to the first perpendicularly magnetized film 2 by applying no Hw', and rising the temperature of the medium larger than the Curie temperature by the photoirradiation. In such a way, it is possible to make the switching of the polarity of the external magnetic field at the time of erasure, and to perform the rise of the erasing operation at high speed.

17. 发明专利

JPS6331016A MAGNETIC HEAD 失效
公开(公告)号：JPS6331016A
公开(公告)日：1988-02-09
申请号：JP17383186
申请日：1986-07-25
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： ISHII OSAMU , NONAKA KOTARO , HATAKEYAMA IWAO
IPC分类号： G11B5/31 , G11B11/105
摘要： PURPOSE:To make the head immune from the limit of a transferable it length and the magnetic domain pattern of an adjoining track and to prevent the sensitivity reduction, etc., due to a fine pattern and curling by constituting a head magnetic pole of a magnetic film in which the direction vertical to a film surface is magnetizing easy shaft and the anisotropic magnetic field is larger than a self-decreasing magnetic field. CONSTITUTION:A magnetic pole is constituted of a magnetic film in which the direstion vertical to the film surface is a magnetizing easy shaft and an anisotropic magnetic field Hk is larger than a self-decreasing magnetic field 4piMs. For this reason, the magnetic pole of a magnetic head is the signal magnetic domain film of a vertical magnetization and the influence of a banded magnetic domain like a conventional magnetic transferring head is not executed. It is unnecessary to minimize the pattern, a signal magnetic domain comes to be the trigger of the magnetizing inversion due to a new creation and the reproducing output much larger than a conventional magnetic transferring head and a micro magnetic head can be obtained.

18. 发明专利

JPS6236760A RECORDING AND REPRODUCING SYSTEM 失效
公开(公告)号：JPS6236760A
公开(公告)日：1987-02-17
申请号：JP17424485
申请日：1985-08-09
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： IIJIMA TETSUO , HATAKEYAMA IWAO
IPC分类号： G11B11/10 , G11B11/105 , G11B21/10
摘要： PURPOSE:To attain a recording/reproducing system with high recording track density and high recording density by scanning a guide means with the light beam given from an optical head, securing the coincidence between the focal point of the light beam and a magnetic thin film as well as the follow-up of said focal point to the guide means under the control of the optical head and using a magnetic head to support the optical head. CONSTITUTION:A light beam 7 is reflected by a guide means 2 and condensed condensed by a lens 11 and also made incident on a photodetecting element via a mirror 8. In response to these conditions, a servo mechanism works to control an optical head 10 in the direction along the beam 7 and in the direction orthogonal to a recording track shown by the means 2 via a drive member 12 and a coupling member 13. As a result, the focal point of the beam 7 is coincident with the means 2 and also follows the means 2. Thus the space between the head 10 and a magnetic thin film 3 is set automatically by the control for coincidence secured between the head 10 and the focal point of the beam 7. As a result, the space of a magnetic head 24 is maintained with high accuracy. This secures a recording process with high density onto a recording track of the film 3.

19. 发明专利

JPS61168217A FE-B AMORPHOUS MAGNETIC FILM OF MAGNETO-OPTICAL REPRODUCING HEAD AND MANUFACTURE THEREOF 失效
公开(公告)号：JPS61168217A
公开(公告)日：1986-07-29
申请号：JP874985
申请日：1985-01-21
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： ISHII OSAMU , HIRONO SHIGERU , HATAKEYAMA IWAO
IPC分类号： C23C14/00 , C22C38/00 , C22C45/02 , C23C14/22 , G02F1/09 , G11B11/10 , G11B11/105 , H01F10/12 , H01F10/13 , H01F10/14 , H01F41/14
摘要： PURPOSE:To reproduce a high-density record with a high S/N ratio by fabricating a reproducing head comprising an Fe-B amorphous alloy film having the magneto-optical effect. CONSTITUTION:A magnetic film 1 having the magneto-optical effect is installed in the plane perpendicular to that of a magnetic recording medium 2 to magnetize the tip part of the film 1. By irradiating that magnetized film 1 with a polarized light 3 and leading the reflected light 4 to a light detector, the rotating of the plane of polarization is detected. The magnetic film 1 is produced by heating a (100-X)atom% Fe-Xatom% B(X=15-55) amorphous alloy film which has been formed with the PVD method on a substrate.

20. 发明专利

JPS57183614A VERTICAL MAGNETIC RECORDING HEAD 失效
公开(公告)号：JPS57183614A
公开(公告)日：1982-11-12
申请号：JP6895581
申请日：1981-05-07
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： HATAKEYAMA IWAO , YOSHII SHIZUKA
IPC分类号： G11B5/127
摘要： PURPOSE:To realize the recording with ultrahigh density for a vertical recording medium, by providing the same polarity to the two head cores which are opposite to each other and having minute gaps and forming a sharp magnetic flux distribution by making use of the repulsion caused between the same polarities. CONSTITUTION:A coil 6.2 is wound around a head core 6.1, and a head gap 6.3 is formed. At the same time, a reproducing coil 6.6 is wound around the core 6.1 to detect the change of magnetization within the magnetic pole. The coil 6.2 is energized so that a magnetic pole of the same polarity is formed on the core surface at the gap 6.3. The magnetic fluxes at the inside and the outside of the core are shown by the dotted lines in the figure and have the mutual repulsion to be converged at the gap 6.3. A part of the magnetic flux flows to the opposite side to the gap 6.3 to form a closed magnetic path, and another part of the magnetic flux goes toward a vertical recording medium 2.1. In addition, a magnetic core 8.1 is provided at the position near the gap 6.3, and the magnetic fluxes shown by the dotted lines are generated by a coil 8.2 wound around the core 8.1. As a result, the quantity of leakage toward the medium 2.1 can be increased for the magnetic flux generated at the gap 6.3.

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