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41. 发明专利

JPH02189743A OPTICAL DISK 失效
公开(公告)号：JPH02189743A
公开(公告)日：1990-07-25
申请号：JP1085689
申请日：1989-01-18
申请人： FUJITSU LTD
发明人： KANO HIROSHI , SHONO KEIJI , KURODA SUMIO
IPC分类号： G11B11/10 , G11B7/00 , G11B7/004 , G11B7/24 , G11B11/105
摘要： PURPOSE:To reduce a cost by recording a signal to the projecting part of a tracking groove on one face and recording the signal on a recessed part of the tracking groove on the other face to apply recording/reproduction to the double-side of the tracking groove. CONSTITUTION:An optical head 10 makes access to the projecting part GU of a tracking groove G to apply recording and reproduction and the other optical head 10 makes access to the recessed part GD of the tracking groove G to apply recording and reproduction. For example, a signal read from a base 5 is recorded to the projecting part GU of the tracking groove G and the signal read from the other side is recorded to the recessed part GD of the tracking groove G. Thus, the double-side of the tracking groove G is used for recording and reproducing the signal. Thus, the cost of the optical disk being a recording medium is halved.

42. 发明专利

JP2003203325A MASTER MEDIUM FOR MAGNETIC TRANSFER, MAGNETIC TRANSFER RECORDING METHOD, SLAVE MEDIUM FOR MAGNETIC RECORDING, AND METHOD FOR MANUFACTURING MASTER MEDIUM FOR MAGNETIC TRANSFER 审中-公开
公开(公告)号：JP2003203325A
公开(公告)日：2003-07-18
申请号：JP2001402009
申请日：2001-12-28
申请人： FUJITSU LTD
发明人： HAMAGUCHI SHINGO , KURODA SUMIO , OZAKI KAZUYUKI , TAMANOI TAKESHI , MATSUMOTO KOJI
IPC分类号： G11B5/65 , G11B5/66 , G11B5/84 , G11B5/86
摘要： PROBLEM TO BE SOLVED: To provide a master medium for magnetic transfer which realizes a quick change of a magnetic field at the magnetization boundary of a first perpendicular ferromagnetic film thereof in the direction parallel with a substrate surface and reduces the influence of the variance of the external magnetic field and achieves accurate transfer therefrom to a slave medium for magnetic recording. SOLUTION: Recessed parts are formed on the surface of a substrate 1 in accordance with a pattern of recording information to be transferred, and a first perpendicular ferromagnetic film 2 is formed on the recessed parts. The surface of the substrate 1 and that of the first perpendicular ferromagnetic film 2 are leveled into the same plane, and a second perpendicular ferromagnetic film 3 is formed on the surface of the substrate 1 and that of the first perpendicular ferromagnetic film 2 which are leveled into the same plane. COPYRIGHT: (C)2003,JPO

43. 发明专利

JP2001184731A INFORMATION RECORDING MEDIUM, METHOD FOR MANUFACTURING THE SAME, FLOATING HEAD AND INFORMATION RECORDING AND REPRODUCING METHOD 失效
公开(公告)号：JP2001184731A
公开(公告)日：2001-07-06
申请号：JP36282999
申请日：1999-12-21
申请人： FUJITSU LTD
发明人： KURODA SUMIO , OZAKI KAZUYUKI
IPC分类号： G11B7/24 , G11B7/12 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide an information recording medium capable of recording information with higher density. SOLUTION: The surface of the information recording medium which has recording films 4 on a substrate 1 and has transparent parts (2 and 3) existing on the surface of the substrate 1 is nearly flat and the transparent parts (2 and 3) are the position for tracking servo information and/or parts indicating address information.

44. 发明专利

JPH11126343A OPTICAL RECORDING MEDIUM DRIVING DEVICE 失效
公开(公告)号：JPH11126343A
公开(公告)日：1999-05-11
申请号：JP28747597
申请日：1997-10-20
申请人： FUJITSU LTD
发明人： IIDA KOICHI , KURODA SUMIO
IPC分类号： G11B7/24 , G11B7/00 , G11B7/005 , G11B7/007 , G11B7/085 , G11B7/09
摘要： PROBLEM TO BE SOLVED: To obtain a correct tracking count by detecting positions of an irradiating light to be irradiated on tracks, outputting position signals while holding peaks of them and holding bottoms of them and forming the tracking error signal while changing over a peak-hold output signal and a bottom-hold output signal. SOLUTION: At the time of producing a tracking error signal at the time of a seek from an optical disk 110, the difference signal outputted by a differential amplifeier 313 which is the signal based on output signals of peak holding circuits 311, 311a becomes a signal in which droppings due to prepits of the ID part of a land part are recovered. Moreover, the difference signal outputted by a differential amplifier 313a which is the signal based on output signals of bottom holding circuits 312, 312a becomes a signal in which droppings due to penetratingly provided grooves of the ID part of a groove part are recovered. The tracking error signal is obtained by allowing a switching circuit 316 to select larger recovered signals with the comparison result of a comparator circuit 315.

45. 发明专利

JPH0620317A CRYSTALLIZATION METHOD FOR GARNET FILM 失效
公开(公告)号：JPH0620317A
公开(公告)日：1994-01-28
申请号：JP17461192
申请日：1992-07-02
申请人： FUJITSU LTD
发明人： TAMANOI TAKESHI , SHONO KEIJI , KURODA SUMIO
IPC分类号： C03C17/02 , G11B11/10 , G11B11/105
摘要： PURPOSE:To crystallize an amorphous garnet deriv. film by irradiating this amorphous garnet deriv. film with UV rays of the wavelength at which energy is liable to be selectively absorbed only in the amorphous garnet deriv. film. CONSTITUTION:A sample 11 formed with the amorphous garnet deriv. film on a heat resistant glass substrate 4 is prepd. The substrate 4 is installed in a vacuum chamber 14. The inside of this chamber 14 is evacuated until a prescribed pressure is attained. Gaseous nitrogen is then introduced by a gas introducing pipe 21 into the chamber until a prescribed pressure is attained. An electrode 16 of a UV lamp 12 is energized to irradiate the substrate 4 with the UV rays emitted by an electric discharge through an irradiation window 22. The substrate 4 is thus rapidly irradiated with the energy of the UV rays and is heated. As a result, the deriv. film on the substrate 4 is heated up to a prescribed temp. at a prescribed heating up rate. After the substrate is held for a prescribed period of time in a gaseous nitrogen atmosphere, the supply of the electric power onto the lamp 12 is stopped and a substrate installing base 2 is taken out of the chamber 14 filled with the gaseous nitrogen.

46. 发明专利

JPH04353638A OPTOMAGNETIC DISK AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH04353638A
公开(公告)日：1992-12-08
申请号：JP12727691
申请日：1991-05-30
申请人： FUJITSU LTD
发明人： KURODA SUMIO , SHONO KEIJI
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To easily inexpensively obtain an optomagnetic disk with grooves even if the grooves are not directly formed on a substrate which is difficult to form the groove. CONSTITUTION:An optomagnetic recording film 2 and a transparent conductive film 3 are provided on one flat platelike transparent substrate 1, a light reflecting film 6 is provided on other substrate 5 in which grooves 7 corresponding to recording/reproducing information are provided, and the film 3 is so brought into contact with the film 6 as to be opposite to one another. And, a voltage is applied between the films 3 and 6 to form charges of reverse polarities induced in the films 3 and 6 thereby to electrostatically couple both the substrates 1, 5.

47. 发明专利

JPH0467336A MAGNETO-OPTICAL DISK AND MANUFACTURE OF THE SAME 失效
公开(公告)号：JPH0467336A
公开(公告)日：1992-03-03
申请号：JP17423190
申请日：1990-06-29
申请人： FUJITSU LTD
发明人： SHONO KEIJI , MORIBE MINEO , KURODA SUMIO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To easily from the guide groove of tracking when the formation of a magneto-optical recording film is difficult directly on a substrate by providing the magneto-optical recording film where the groove is formed on the transparent substrate and providing a light reflecting film on the magneto-optical recording film. CONSTITUTION:The magneto-optical recording film 12 where the groove 13 is formed on the transparent substrate 11 is provided and the light reflecting film 14 is provided on the magneto-optical recording film 12. The magneto- optical recording medium 12 composed of a transparent cerium substitution garnet film having a step is formed on the hard substrate 11 which does not have the transparent and flat groove such as GGG(Gd-Ga-Garnet) substrate whose heat resistance is high and the light reflecting film 14 is formed on the medium. Thus, constitution is equivalent to that of a pregroup when laser beam is radiated from the lower side of the substrate 11 and manufacture is facilitated.

48. 发明专利

JPH03113755A PRODUCTION OF MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH03113755A
公开(公告)日：1991-05-15
申请号：JP24865989
申请日：1989-09-25
申请人： FUJITSU LTD
发明人： SHONO KEIJI , KURODA SUMIO
IPC分类号： G11B11/10 , G11B11/105 , H01F10/24
摘要： PURPOSE:To realize mass production of the magneto-optical recording medium by mounting a hot press target consisting of magnetic garnet having a specific compsn. on a Gd3Ga5O12 substrate on a backing plate having a low thermal conductivity and subjecting the target to sputtering. CONSTITUTION:The hot plate target 1 consisting of the magnetic garnet expressed by formula is fixed to the stainless steel backing plate 7 by using a frame body 8 and is mounted to a magnetron sputtering device. In the formula, R is a rare earth element, such as Y or Dy; A is an element, such as Bi or Pb, which can be substd. with the rare earth element and increases the magneto-optical effect; M is an element which is substd. with Fe. The magnetic garnet film is formed by the sputtering method on the gadolinium/gallium/garnet (Gd3Ga5O12) substrate in such a manner. The surface temp. of the target 1 is increased and the formation of the magnetic garnet film having the crystallinity approximate to the crystallinity of the single crystal is possible according to this production process. The mass production of the magneto- optical recording medium is thus possible.

49. 发明专利

JPH0696487A MAGNETO-OPTICAL DISK DEVICE AND MAGNETO-OPTICAL RECORDING METHOD 失效
公开(公告)号：JPH0696487A
公开(公告)日：1994-04-08
申请号：JP24470192
申请日：1992-09-14
申请人： FUJITSU LTD
发明人： KURODA SUMIO , SHONO KEIJI , TAMANOI TAKESHI
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To improve recording density with simple constitution by forming a magneto-optical disk by interposing a reflection film between recording films and providing an optical system only on the rear side of a substrate. CONSTITUTION:A cerium replacing garnet film if formed on a GGG substrate 1 with an e.g. 3 inches diameter by sputter as the recording film 2-1, and the reflection film 11-1 laminating e.g. 3 times prescribed film thickness of a zinc sulfide film and a magnesium fluoride film alternately is provided on that. The recording film 2-2 consisting of a bismuth replacing garnet film is formed on that by sputter. Then, the reflection film 11-2 consisting of A1 is formed on the uppermost layer by sputter. Then the optical system are provided only on the rear side of the substrate. These optical system are shown as laser light sources 12-1 to 12-4, an objective lens 14, a dichronic mirrors 15-1 to 15-3, a beam splitter 16, a polarizing beam splitter 17, a quadrisected photodetecting element 18A, etc.

50. 发明专利

JPH05347039A 失效
公开(公告)号：JPH05347039A
公开(公告)日：1993-12-27
申请号：JP3646493
申请日：1993-02-25
申请人： FUJITSU LTD
发明人： SHONO KEIJI , TAMANOI TAKESHI , KURODA SUMIO , MATSUMOTO KOJI
IPC分类号： G11B11/10 , G11B7/253 , G11B11/105 , H01F10/24 , H01F41/18
摘要： PURPOSE:To decrease medium noises by laminating a first garnet ground layer which is not crystallized, a second garnet ground layer which is crystallized and a garnet recording layer on a glass substrate. CONSTITUTION:The first ground layer 2 consisting of the amorphous dielectric substance of yttrium, gallium and garnet having 0.05mum film thickness is formed by a high-frequency magnetron sputtering method on the surface of the glass substrate 1 consisting of aluminosilicate glass of 3 inch diameter and 1.2mm thickness without contg. an alkaline metal. The second ground layer 3 consisting of the amorphous dielectric substance of yttrium, iron and garnet having 0.1mum film thickness is formed on this ground layer 2. Ar alone or a gaseous mixture formed by mixing the Ar and gaseous oxygen at 10% by volume is used as a sputtering gas at this time. Further, a bismuth-substd. garnet film 4 is formed by a sputtering method which is a high-temp. film forming method on the surface of the second layer 3 and an aluminum film 4a having 70nm film thickness is formed on the surface thereof. The recording medium having the decreased medium noises is obtd.

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