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1. 发明专利

JP2003223709A FLEXIBLE MAGNETIC RECORDING MEDIUM 审中-公开
公开(公告)号：JP2003223709A
公开(公告)日：2003-08-08
申请号：JP2002020325
申请日：2002-01-29
申请人： FUJI PHOTO FILM CO LTD
发明人： NOGUCHI HITOSHI , YAMAZAKI NOBUO , SAITO SHINJI
IPC分类号： G11B5/702
摘要： PROBLEM TO BE SOLVED: To increase the number of a magnetic duplication cycle by composing a flexible magnetic recording medium so that it is hard to generate corrosion on a master support surface for magnetic duplication. SOLUTION: The polyurethane resin containing at least a kind of polar group in a range from 0.05 to 0.7 meq/g is made to contain at 60% by weight or more with respect to the total amount of resin in a magnetic layer into the magnetic layer of the flexible magnetic recording medium which has a coating layer including the magnetic layer and a non-magnetic layer. The polar group is selected from -SO 3 M, -OSO 3 M, -P=O(OM) 2 , -O-P=O(OM) 2 and -COOM (M expresses hydrogen atom, alkali metal, or ammonium salt). COPYRIGHT: (C)2003,JPO

2. 发明专利

JP2003203390A OPTICAL INFORMATION RECORDING MEDIUM 审中-公开
公开(公告)号：JP2003203390A
公开(公告)日：2003-07-18
申请号：JP2001399524
申请日：2001-12-28
申请人： FUJI PHOTO FILM CO LTD
发明人： ISHIDA TOSHIO , SAITO SHINJI , TSUNODA TAKESHI
IPC分类号： G11B7/24 , B32B3/02 , G11B7/004 , G11B7/254 , G11B7/256 , G11B7/26
摘要： PROBLEM TO BE SOLVED: To provide an optical information recording medium having lesser noise and excellent recording characteristics. SOLUTION: The optical information recording medium has a recording layer and a cover layer successively from a substrate side on the substrate and permits recording of information by irradiating the recording layer with a laser beam of a wavelength 380 to 500 nm through an objective lens of ≥0.7 in the aperture ratio of the lens, in which the cover layer is formed by means of an acrylic tacky adhesive on the surface of the recording layer. COPYRIGHT: (C)2003,JPO

3. 发明专利

JP2003168243A OPTICAL INFORMATION RECORDING MEDIUM 审中-公开
公开(公告)号：JP2003168243A
公开(公告)日：2003-06-13
申请号：JP2001366190
申请日：2001-11-30
申请人： FUJI PHOTO FILM CO LTD
发明人： ISHIDA TOSHIO , TSUNODA TAKESHI , SAITO SHINJI
IPC分类号： G11B7/24 , B32B3/02 , G11B7/135 , G11B7/244 , G11B7/248
摘要： PROBLEM TO BE SOLVED: To provide an optical information recording medium having a large carrier/noise ratio and stable recording/reproducing characteristics. SOLUTION: This optical information recording medium has a recording layer and a cover layer in this order on a substrate surface, and a laser beam having a wavelength of 380 to 500 nm is radiated through a lens having a lens numerical aperture NA of 0.7 or higher to carry out recording/reproducing. The recording layer is an organic material layer, and an attenuation coefficient (k) of the recording layer is ≥0.1 to COPYRIGHT: (C)2003,JPO

4. 发明专利

JP2003165272A OPTICAL INFORMATION RECORDING MEDIUM 审中-公开
公开(公告)号：JP2003165272A
公开(公告)日：2003-06-10
申请号：JP2001366189
申请日：2001-11-30
申请人： FUJI PHOTO FILM CO LTD
发明人： ISHIDA TOSHIO , TSUNODA TAKESHI , SAITO SHINJI
IPC分类号： B41M5/26 , G11B7/24 , G11B7/245 , G11B7/247 , G11B7/248 , G11B7/249
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical information recording medium having a high modulation factor and stable recording/reproducing characteristics. SOLUTION: The optical information recording medium comprises a recording layer and a cover layer sequentially provided in this order on the surface of a substrate. In this medium, a laser beam having a wavelength of 380 to 500 nm is emitted through a lens having an open area ratio NA of 0.7 or more to record and reproduce. The recording layer contains an organic material, and the damping coefficient (k) of the recording layer is larger than 0.3. COPYRIGHT: (C)2003,JPO

5. 发明专利

JP2003016631A Magnetic recording medium 审中-公开
标题翻译：磁记录介质
公开(公告)号：JP2003016631A
公开(公告)日：2003-01-17
申请号：JP2001198884
申请日：2001-06-29
申请人： Fuji Photo Film Co Ltd , 富士写真フイルム株式会社
发明人： YAMAZAKI NOBUO , SAITO SHINJI
IPC分类号： G11B5/714 , G11B5/70 , G11B5/706
CPC分类号： G11B5/70678 , Y10T428/24355
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording medium for replaying with an MR head which is a conventionally used coating-type magnetic recording medium having excellent productivity and available at a low price and which is excellent in high density characteristics with low noise including thermal asperity. SOLUTION: The magnetic recording medium for replaying with an MR head has a lower layer which is substantially nonmagnetic and a magnetic layer having ferromagnetic hexagonal ferrite powder dispersed in a binder, formed in this order on a supporting body. By the frequency analysis of the surface roughness of the magnetic layer, the intensity at 100/mm space frequency is and the intensity at 500/mm space frequency is 50 to 500 nm . The average particle diameter of the ferromagnetic hexagonal ferrite powder is 15 to 35 nm.
摘要翻译：要解决的问题：提供一种磁记录介质，用于以具有优异生产率和低价格获得的常规使用的涂覆型磁记录介质的MR磁头进行重放，并且具有优异的高密度特性，低噪声包括热粗糙。解决方案：用于用MR重放的磁记录介质具有基本上非磁性的较低层和分散在粘合剂中的铁磁性六角铁氧体粉末的磁性层依次形成在支撑体上。通过磁性层表面粗糙度的频率分析，100 / mm空间频率下的强度为<= 10,000nm 3，500 / mm空间频率下的强度为50〜500nm 3。铁磁性六角铁氧体粉末的平均粒径为15〜35nm。

6. 发明专利

JP2002373451A Optical recording medium 有权
标题翻译：光学记录介质
公开(公告)号：JP2002373451A
公开(公告)日：2002-12-26
申请号：JP2001178954
申请日：2001-06-13
申请人： Fuji Photo Film Co Ltd , 富士写真フイルム株式会社
发明人： SAITO SHINJI , TSUNODA TAKESHI , ISHIDA TOSHIO
IPC分类号： B41M5/26 , G11B7/24 , G11B7/241 , G11B7/244 , G11B7/257 , G11B7/26
CPC分类号： G11B7/246 , G11B7/24 , G11B7/245 , G11B7/2467 , G11B7/2472 , G11B7/2475 , G11B7/2478 , G11B7/248 , G11B7/2531 , G11B7/2533 , G11B7/2534 , G11B7/2535 , G11B7/2542 , G11B7/256 , G11B7/2578 , G11B7/259 , G11B7/26 , G11B2007/25706 , G11B2007/25708 , G11B2007/2571 , G11B2007/25713 , G11B2007/25715 , G11B2007/25716 , Y10T428/21
摘要： PROBLEM TO BE SOLVED: To provide a high-density DRAW type optical recording medium, having superior recording characteristics. SOLUTION: This optical recording medium has a light reflecting layer, a recording layer and a cover layer arranged in this order on a substrate, so that the recording and reproducing of the optical recording medium is conducted by having it irradiated with a laser beam of =1 nm to
摘要翻译：要解决的问题：提供具有优良记录特性的高密度DRAW型光学记录介质。解决方案：该光记录介质具有在基板上依次排列的光反射层，记录层和覆盖层，从而通过照射光记录介质的激光束来进行光记录介质的记录和再现， = 450nm波长，从覆盖层的侧面。具有> = 1nm至<= 80nm厚度的溅射层布置在记录层和覆盖层之间，并通过使用粘合剂粘附在覆盖层上。

7. 发明专利

JP2002324337A OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JP2002324337A
公开(公告)日：2002-11-08
申请号：JP2001128733
申请日：2001-04-26
申请人： FUJI PHOTO FILM CO LTD
发明人： TSUNODA TAKESHI , SAITO SHINJI , ISHIDA TOSHIO
IPC分类号： B41M5/26 , G11B7/24 , G11B7/244
摘要： PROBLEM TO BE SOLVED: To provide an optical recording medium having an excellent C/N ratio and reproduction durability to which a high-density recording is possible without any trouble. SOLUTION: This medium is an optical recording medium to which recoding and reproduction are made with a laser light with at most 450 nm and an objective lens with a numerical aperture(NA) of at least 0.7. In addition, a reflection layer, a recording layer and a covering layer are laminated in this order on a substrate where a groove with its track pitch of 200 to 400 nm, depth of 50 to 150 nm and width of 90 to 200 nm is formed. In this case, the recording layer contains a pigment having one or more maximum absorptions at 600 to 800 nm and 300 to 400 nm, respectively.

8. 发明专利

JP2001357518A METHOD FOR MANUFACTURING MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JP2001357518A
公开(公告)日：2001-12-26
申请号：JP2000176916
申请日：2000-06-13
申请人： FUJI PHOTO FILM CO LTD
发明人： YAMAZAKI NOBUO , SAITO SHINJI
IPC分类号： G11B5/842
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a disk type magnetic recording medium having large capacity in which the thermal shrinkage and anisotropy are small without thermal treatment of punched and stacked flexible disks, the record of servo tracks is maintained as a circular state even when the disk is exposed to the environment at a temperature of >=40 deg.C, particularly the high density recording characteristics and the error rate in a high density recording region are significantly improved, the track density is >=2,000 TPI and the following property for the tracks by a head is stabilized. SOLUTION: In the method for manufacturing the magnetic recording medium, the medium has a nonmagnetic base layer and a magnetic layer having ferromagnetic fine powder dispersed in a binder on a nonmagnetic supporting body and has >=2,000 TPI track density and

9. 发明专利

JPH11250448A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH11250448A
公开(公告)日：1999-09-17
申请号：JP5079798
申请日：1998-03-03
申请人： FUJI PHOTO FILM CO LTD
发明人： HASHIMOTO HIROSHI , YAMAZAKI NOBUO , SAITO SHINJI
IPC分类号： G11B5/708 , G11B5/71
摘要： PROBLEM TO BE SOLVED: To obtain a magnetic recording medium having excellent durability particularly with a disk medium of a high recording density, excellent electromagnetic transducing characteristics, excellent stabile storage and excellent productivity. SOLUTION: This magnetic recording medium is provided with a magnetic layer contg. fine ferromagnetic powder and a binder on a nonmagnetic base. The magnetic layer of the magnetic recording medium described above contains fine diamond powder of an average grain size of 0.10 to 1.0 μm and the diester compd. expressed by the following formula (1): R1-X-R2... (1). In the formula (1), R1 and R2 respectively independently denote 5-12C fatty acid residue and X denotes 2-10C bivalent alcohol residue.

10. 发明专利

JPH11120536A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH11120536A
公开(公告)日：1999-04-30
申请号：JP28063097
申请日：1997-10-14
申请人： FUJI PHOTO FILM CO LTD
发明人： YAMAZAKI NOBUO , SAITO SHINJI
IPC分类号： G11B5/70 , G11B5/738
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording medium having improved electromagnetic conversion characteristics and travelling durability, low electric resistance and little dropout as an ATOMM type medium, especially to provide a disk-type medium having high travelling durability. SOLUTION: This magnetic recording medium consists of a base layer which is substantially nonmagnetic and essentially consists of a nonmagnetic powder and a binder resin, and a magnetic layer essentially comprising a ferromagnetic metal powder and a binder resin formed in this order on a supporting body. The magnetic layer is =2000 Oe coercive force. The ferromagnetic metal powder has =10 wt.% to the nonmagnetic powder and contains a resin component having 100 to 300 polymn. degree as a binder resin.

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