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1. 发明专利

CA1206524A OPTICAL MAGNETIC-FIELD MEASURING APPARATUS 未知
公开(公告)号：CA1206524A
公开(公告)日：1986-06-24
申请号：CA440121
申请日：1983-10-31
申请人： HITACHI LTD , HITACHI CABLE
发明人： NAGATSUMA KAZUYUKI , MATSUMURA HIROYOSHI , SUGANUMA TSUNEO , OHTA NORIO , ANDO KEIKICHI , HOSOE YUZURU , SUGITA YUTAKA
IPC分类号： G01R33/032 , G02F1/09
摘要： In a magnetic-field measuring apparatus having a Faraday rotation property, a medium having the Faraday rotation property includes at least one magnetic garnet thin film having a composition represented by a general formula of R3(Fe5-xMx)O12 (where R is at least one element selected from a group consisting of La, Sm, Lu, Ca and Bi, or at least two elements selected from the group with Y being added thereto, M is at least one element selected from a group consisting of Ga, Ge, Al, Si, Sc, In and Cr, and a range of x is 0

2. 发明专利

GB2130365B OPTICAL MAGNETIC-FIELD MEASURING APPARATUS 未知
公开(公告)号：GB2130365B
公开(公告)日：1986-09-24
申请号：GB8328659
申请日：1983-10-26
申请人： HITACHI LTD , HITACHI CABLE
发明人： NAGATSUMA KAZUYUKI , MATSUMURA HIROYOSHI , SUGANUMA TSUNEO , OHTA NORIO , ANDO KEIKICHI , HOSOE YUZURU , SUGITA YUTAKA
IPC分类号： G01R33/032 , G02F1/09
摘要： In a magnetic-field measuring apparatus having a Faraday rotation property, a medium having the Faraday rotation property includes at least one magnetic garnet thin film having a composition represented by a general formula of R3(Fe5-xMx)O12 (where R is at least one element selected from a group consisting of La, Sm, Lu, Ca and Bi, or at least two elements selected from the group with Y being added thereto, M is at least one element selected from a group consisting of Ga, Ge, Al, Si, Sc, In and Cr, and a range of x is 0

3. 发明专利

GB2130365A OPTICAL MAGNETIC-FIELD MEASURING APPARATUS 未知
公开(公告)号：GB2130365A
公开(公告)日：1984-05-31
申请号：GB8328659
申请日：1983-10-26
申请人： HITACHI LTD , HITACHI CABLE
发明人： NAGATSUMA KAZUYUKI , MATSUMURA HIROYOSHI , SUGANUMA TSUNEO , OHTA NORIO , ANDO KEIKICHI , HOSOE YUZURU , SUGITA YUTAKA
IPC分类号： G01R33/032 , G02F1/09
摘要： In a magnetic-field measuring apparatus having a Faraday rotation property, a medium having the Faraday rotation property includes at least one magnetic garnet thin film having a composition represented by a general formula of R3(Fe5-xMx)O12 (where R is at least one element selected from a group consisting of La, Sm, Lu, Ca and Bi, or at least two elements selected from the group with Y being added thereto, M is at least one element selected from a group consisting of Ga, Ge, Al, Si, Sc, In and Cr, and a range of x is 0

4. 发明专利

DE3851239T2 未知
公开(公告)号：DE3851239T2
公开(公告)日：1994-12-15
申请号：DE3851239
申请日：1988-01-26
申请人： HITACHI LTD
发明人： TERAO MOTOYASU , OHNISHI KUNIKAZU , NISHIDA TETSUYA , YASUOKA HIROSHI , ANDO KEIKICHI , OHTA NORIO , SUKEDA HIROFUMI , TSUNODA YOSHITO , KAKU TOSHIMITSU
IPC分类号： G11B7/0045 , G11B7/006 , G11B11/105 , G11B7/00 , G11B7/24
摘要： The present invention concerns to a method of recording and reproducing information. The information is recorded on and reproduced from a recording medium by use of two energy beams. The method is characterized in that shapes and areas of projection regions said two energy beams are substantially equalized on said recording medium, that one of said two energy beams is first projected on a predetermined position of that recording medium for bringing whole projection region into a fixed state and that the secon energy beam is subsequently projected on the predetermined position of said recording medium. A so called overwrite operation which records new information while erasing existent information ca be reliably performed in an information storage system such as optical disk system. In addiation it can be verified wether the rewriting of recording has been properly carried out.

5. 发明专利

DE3851239D1 未知
公开(公告)号：DE3851239D1
公开(公告)日：1994-10-06
申请号：DE3851239
申请日：1988-01-26
申请人： HITACHI LTD
发明人： TERAO MOTOYASU , OHNISHI KUNIKAZU , NISHIDA TETSUYA , YASUOKA HIROSHI , ANDO KEIKICHI , OHTA NORIO , SUKEDA HIROFUMI , TSUNODA YOSHITO , KAKU TOSHIMITSU
IPC分类号： G11B7/0045 , G11B7/006 , G11B11/105 , G11B7/00 , G11B7/24
摘要： The present invention concerns to a method of recording and reproducing information. The information is recorded on and reproduced from a recording medium by use of two energy beams. The method is characterized in that shapes and areas of projection regions said two energy beams are substantially equalized on said recording medium, that one of said two energy beams is first projected on a predetermined position of that recording medium for bringing whole projection region into a fixed state and that the secon energy beam is subsequently projected on the predetermined position of said recording medium. A so called overwrite operation which records new information while erasing existent information ca be reliably performed in an information storage system such as optical disk system. In addiation it can be verified wether the rewriting of recording has been properly carried out.

6. 发明专利

DE3374482D1 GARNET FILM FOR ION-IMPLANTED MAGNETIC BUBBLE DEVICE 未知
公开(公告)号：DE3374482D1
公开(公告)日：1987-12-17
申请号：DE3374482
申请日：1983-02-01
申请人： HITACHI LTD
发明人： OHTA NORIO , ANDO KEIKICHI , HOSOE YUZURU , SUGITA YUTAKA , ISHIDA FUMIHIKO
IPC分类号： C01G49/02 , C01G49/00 , G11C11/14 , H01F10/24
摘要： The invention relates to a garnet film for an ion-implanted device characterized in that the quantity of Fe is increased and a predetermined quantity of Gd is added.The garnet film of the invention has a sufficiently high Curie temperature without sacrificing its other properties and hence is extremely suitable as a garnet film for an ion-implanted device.

7. 发明专利

DE3339506A1 未知
公开(公告)号：DE3339506A1
公开(公告)日：1984-05-10
申请号：DE3339506
申请日：1983-10-31
申请人： HITACHI LTD , HITACHI CABLE
发明人： NAGATSUMA KAZUYUKI , MATSUMURA HIROYOSHI , SUGANUMA TSUNEO , OHTA NORIO , ANDO KEIKICHI , HOSOE YUZURU , SUGITA YUTAKA
IPC分类号： G01R33/032 , G02F1/09 , H01F10/24
摘要： In a magnetic-field measuring apparatus having a Faraday rotation property, a medium having the Faraday rotation property includes at least one magnetic garnet thin film having a composition represented by a general formula of R3(Fe5-xMx)O12 (where R is at least one element selected from a group consisting of La, Sm, Lu, Ca and Bi, or at least two elements selected from the group with Y being added thereto, M is at least one element selected from a group consisting of Ga, Ge, Al, Si, Sc, In and Cr, and a range of x is 0

8. 发明专利

JP2003091872A INFORMATION RECORDING MEDIUM AND MANUFACTURING METHOD 审中-公开
公开(公告)号：JP2003091872A
公开(公告)日：2003-03-28
申请号：JP2001313405
申请日：2001-10-11
申请人： HITACHI LTD
发明人： HIROTSUNE AKEMI , TERAO MOTOYASU , USHIYAMA JUNKO , MINEMURA HIROYUKI , ANDO KEIKICHI , ANZAI YUMIKO , MIYAMOTO MAKOTO
IPC分类号： B41M5/26 , B32B3/02 , B32B7/00 , G11B7/007 , G11B7/24 , G11B7/243 , G11B7/254 , G11B7/257 , G11B7/258
摘要： PROBLEM TO BE SOLVED: To provide an information recording medium capable of using a low- price manufacturing device holding good recording/reproducing characteristics without any deformation of a tracking groove caused by stress between a laminated layer and a substrate during high-density recording/reproducing, and having a large process margin, wherein material cost is low, mass productivity is high, and the medium stress is small. SOLUTION: The information recording medium which allows rewriting many times and executes recording based on the change of an atomic arrangement by light irradiation is provided with a substrate having a thickness of 0.7 mm or lower, a lower protective layer having a thickness of >=20 nm to

9. 发明专利

JP2001344807A INFORMATION RECORDING MEDIUM 失效
公开(公告)号：JP2001344807A
公开(公告)日：2001-12-14
申请号：JP2000170413
申请日：2000-06-02
申请人： HITACHI LTD
发明人： USHIYAMA JUNKO , MIYAMOTO MAKOTO , ANDO KEIKICHI , ANZAI YUMIKO , TERAO MOTOYASU , HIROTSUNE AKEMI
IPC分类号： B41M5/26 , G11B7/24 , G11B7/243 , G11B7/258
摘要： PROBLEM TO BE SOLVED: To keep recording, reproducing and rewriting characteristics more excellently than usual by restraining cross erasion and enhancing erasion ratio. SOLUTION: In this information recording medium, a thin film to be used as a recording layer is formed on a substrate having plural information recording tracks for recording information by the change of atomic arrangement caused by irradiating with light. At least, one protection layer is formed between the substrate and the recording layer. At least, one absorptivity controlling layer is laminated on the side opposite to the recording layer side of the substrate. At least, one thermal diffusion controlling layer is formed between the recording layer and the absorptivity controlling layer so that the film thickness sum of the thermal diffusion controlling layers is equal to, in length, or larger than the difference in level between the information recording tracks of the substrate. The recording layer is optimized in composition and film thickness so that q

10. 发明专利

JP2001014723A INFORMATION RECORDING MEDIUM 失效
公开(公告)号：JP2001014723A
公开(公告)日：2001-01-19
申请号：JP17936099
申请日：1999-06-25
申请人： HITACHI LTD
发明人： HIROTSUNE AKEMI , SHINTANI TOSHIMICHI , TERAO MOTOYASU , ANDO KEIKICHI , ANZAI YUMIKO
IPC分类号： G11B7/243 , B82B1/00 , G11B7/24
摘要： PROBLEM TO BE SOLVED: To provide good recording and reproducing characteristics in recording and reproduction with blue laser by disposing an information recording thin film which records information by a change of its atomic arrangement caused by irradiation with light as a recording layer on a substrate and making the refractive index of the recording thin film in the amorphous state at wavelength for reproduction higher than that in the crystalline state. SOLUTION: An information recording thin film which records information by a change of its atomic arrangement caused by irradiation with light is disposed on a substrate and the refractive index of the recording thin film in the amorphous state at wavelength for reproduction is made higher than that in the crystalline state. When recording is carried out on the recording thin film, the reflectance in the amorphous state is lower than that in the crystalline state and recording starting power in the recording of the shortest mark on the amorphous state is equal to or smaller than that in the recording of the shortest mark on the crystalline state under the same conditions. When the recording thin film is used for a high density rewritable phase change type information recording medium for blue laser, good recording characteristics are provided.

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