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公开(公告)号：EP0162349A3
公开(公告)日：1988-09-07
申请号：EP85105240
申请日：1985-04-30
IPC分类号： G11B05/596 , G11B21/10 , G11B05/74 , G11B05/82 , G11B09/02 , G11B09/04 , G11B09/06 , G11B23/00 , G11B07/24
摘要： A data recording medium including a structure providing variable electromagnetic property (variable, resistance, capacitive, or other variable impedance or other variable electromagnetic property) contrast on the surface marking servo tracks. Such media include magnetic or optical storage disks and tapes. The media can be conductive metallic or nonmetallic and can be composed for example of poorly conductive media, dielectric media, or semiconductive media. The variable electromagnetic impedance can vary in the optical, electrical or other portions of the electromagnetic spectrum. A very small variation of the thickness of the protective layer above the magnetic recording medium is employed to mark the servo track information of the medium. Information to be detected by means of a capacitive sensor can be recorded in the protective layer above or below the magnetic recording or optical storage medium. For example, a thin film metallic protective layer 0.07 micrometers thick can be patterned with about 0.02 micrometers of the protective layer. For a plated disk, the top 0.02 micrometers of the protective layer can be patterned. A pattern for providing a variable impedance for representing data can be formed subtractively by sputter etching, or additively formed by a lift-off process or by deposition through a mask, or by the oxidation of or nitriding of materials such as Al, Si or valve metals.
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公开(公告)号：EP0191567A3
公开(公告)日：1988-03-16
申请号：EP86300492
申请日：1986-01-24
发明人： Kinjo, Hisao
IPC分类号： G11B23/033 , G11B17/32 , G11B23/00 , G11B05/82
CPC分类号： G11B17/32 , G11B23/00 , G11B23/0035 , G11B23/033
摘要： @ An information storage disc assembly comprises at least one flexible information storage disc (12, 12A, 12B) having a recording layer (12b, 12Ab, 12Bb) on one surface thereof, at least one rigid rotary support plate (13, 13A, 13B) fixed coaxially to the information storage disc and having a diameter approximately equal to or greater than a diameter of said information storage disc, and one or a plurality of air introducing space or holes (15, 22, 26, 32, 33, 36, 15A, 15B, 26A, 26B, 32A, 32B, 33A, 33B, 46, 36A, 36B, 121) provided in a vicinity of centers of the information storage disc and the rotary support plate for introducing air between the other surface of the information storage disc and one surface of the rotary support plate during a high speed rotation of the information storage disc assembly so that an air cushion is generated between the information storage disc and the rotary support plate. The air cushion supports the information storage disc so that the information storage disc will not rotate during the high speed rotation.
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3.发明公开
公开(公告)号：EP0049938A3
公开(公告)日：1982-09-08
申请号：EP81302151
申请日：1981-05-14
申请人： DYSAN CORPORATION
CPC分类号： G11B5/845
摘要： Apparatus and a method for positioning a flexible magnetic recording medium, such as a floppy disk, (12; 112), in such a way as to permit magnetic means (14; 162) on opposed sides of the medium to orient the particles in the magnetic coatings on the medium immediately after the coatings have been applied to the medium and as the medium is rotated. In one embodiment, the apparatus includes stabilizing devices (22) which are located at circumferentially spaced locations about the outer periphery of the medium (12) when the medium is mounted for rotation. Each device comprises a pair of substantially J-shaped, wire-like members (38) arranged to define a gap (46) between which the outer peripheral margin of the medium (12) passes. The J-shaped members (38) can be tubular or solid. If tubular, they can be used direct fluid under pressure onto the opposite sides of the medium as the medium rotates. In a second embodiment, a pair of bowl-shaped members (125,126) are hingedly mounted together and moved into face-to-face relationship with each other but are spaced apart to present an outer peripheral, continuous gap (128) which receives the outer peripheral margin of the medium (112) when the medium is rotatably mounted on one of the bowl-shaped members. Air is directed into the interiors of the bowl-shaped members and then outwardly therefrom through the gap on opposite sides of the medium to provide Venturi effect to keep the outer peripheral margin of the medium centered in the gap and stabilized against deviation out of the plane of rotation of the medium.
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公开(公告)号：EP0125478A3
公开(公告)日：1987-05-13
申请号：EP84103878
申请日：1984-04-09
摘要： A servo track in the form of a patterned thin metallic film (15; 25) is disposed between a magnetic record medium (14;: 24) and a dielectric substrate (12; 22). The dielectric substrate (12; 22) can be in the form of a coating on a metallic substrate (11; 21). Where the magnetic record medium is composed of magnetic particles bound in a matrix, the matrix and the dielectric substrate are preferably composed of the same material. An additional layer (26, Figure 2) of dielectric material may be disposed between the metallic servo track film (25) and the magnetic record medium (24).
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公开(公告)号：EP0111217A3
公开(公告)日：1984-10-17
申请号：EP83111733
申请日：1983-11-23
申请人： Tabor Corporation
发明人： Holmes, William A.
CPC分类号： G11B17/0282 , G11B5/825 , G11B23/0035
摘要： A magnetic disk memory seats a memory disk with a consistent high accuracy by engagement on only one side of the disk with a drive chuck (18) that imparts both a circumferential disk-rotating force and a radial disk-locating force. The two forces firmly seat an angled pair of precision disk faces (76, 78) onto the drive spindle (44). The memory disk further can attach at only an inner periphery to the disk hub, by means of a selectively compliant adhesive tape, to allow the disk to deflect elastically away from the hub for accurate head penetration at inner recording tracks. The drive spindle has an arcuate, partial circumferential portion (100), defining substantially less than a full circumferential portion, that engages the angled pair of precision disk faces (76, 78).
摘要翻译： 磁盘存储器通过仅具有盘的一侧的驱动卡盘（18）接合而具有一致的高精度来存储存储盘，所述驱动卡盘（18）具有周向盘旋转力和径向盘定位力。 两个力将一对成对的精密盘面（76,78）固定在驱动轴（44）上。 存储盘还可以通过选择性顺应的粘合带仅在内周缘附接到盘毂，以允许盘弹性地离开轮毂偏转，以在内部记录轨道处精确地进行头部穿透。 驱动主轴具有弓形的部分圆周部分（100），其限定实质上小于整个圆周部分，其接合成角度的一对精密盘面（76,78）。
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公开(公告)号：EP0194890A3
公开(公告)日：1988-04-06
申请号：EP86301838
申请日：1986-03-13
发明人： Alexander, Jerry L. c/o Minnesota Mining and , Narayan, Sankar B. c/o Minnesota Mining and , Nelson, Charles E. c/o Minnesota Mining and , Gerfast, Sten R. c/o Minnesota Mining and
CPC分类号： G11B5/825 , G11B23/005
摘要： Stretched surface recording disk (SD) 10 comprises an diameters respectively. The SD is annealed twice during annular support 12 having raised annular ridges 42 and 28 at manufacture to relieve stress in the stretched film 14. This its inside and outside diameters 22 and 30 with a base annealing results in SD essentially free from track anisotropy portion 24 in between the two ridges, and an annular and stress distribution anisotropy in the plane of the disk. As recording medium film 14 held in radial tension and a result, data tracks are more stable than in previous SD, stretched across the base portion by adhering the film to track density can be greater, and the SD is generally more attachment surfaces 48 and 36 near the inside and outside reliable.
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公开(公告)号：EP0109481A3
公开(公告)日：1986-03-19
申请号：EP83105929
申请日：1983-06-16
发明人： Weiss, Joel Richard
摘要： A magnetic recording disk is formed with a silicon substrate, the surfaces of which are essentially free of asperities. A non-magnetic undercoat layer is coated on one or both surfaces of the substrate. A magnetic layer is applied to the free surface of the or each undercoat layer. A non-magnetic overcoat layer is applied to the or each magnetic layer.
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公开(公告)号：EP0123258A3
公开(公告)日：1985-09-18
申请号：EP84104340
申请日：1984-04-17
CPC分类号： G11B5/825 , G11B5/7315 , Y10S428/90 , Y10S428/91 , Y10T428/24372 , Y10T428/24612 , Y10T428/24942 , Y10T428/24975 , Y10T428/26 , Y10T428/264 , Y10T428/265 , Y10T428/31786 , Y10T428/31797 , Y10T428/31938
摘要： @ A magnetic recording disk which comprises (1) a three-layered laminate consisting of a core layer of a biaxially oriented polyolefinfilm which has a birefringence of not more than 0.01 and an amorphous-region orientation coefficient of not more than 0.2 and two outer layers of a biaxially oriented polyester film adhered to said core layer, and (2) a magnetic layer formed on at least one side of the laminate. The magnetic recording disk of the invention undergoes only slight dimensional changes with variations in humidity and temperature, and the dimensional changes are isotropic in the plane. The disk therefore has an excellent electromagnetic properties such as output fluctuation and outbreak of dropouts caused by the environmental change.
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