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51. 发明专利

JPS62176771A POLISHING TAPE 失效
公开(公告)号：JPS62176771A
公开(公告)日：1987-08-03
申请号：JP1859486
申请日：1986-01-30
申请人： FUJI PHOTO FILM CO LTD
发明人： YAMAGUCHI NOBUTAKA , TADOKORO EIICHI , FUJIYAMA MASAAKI , UCHIUMI MASAHIRO , KASUGA AKIRA , SUZUKI MASAMI
IPC分类号： B24D11/00 , G11B5/127 , G11B5/187
摘要： PURPOSE:To improve the surface performance of a coated film by forming said coated film containing the polishing agent made of chromium oxide and the bonding agent made of vinyl chloride-vinyl active-vinyl alcohol onto a nonmagnetic supporting body, thus permitting the sufficient polishing without damaging the tape sliding surface of a magnetic head. CONSTITUTION:A polishing tape is constituted of a nonmagnetic supporting body 1 and a coated layer 2 formed onto the supporting body 1. Said coated layer 2 contains a polishing agent 3 and a bonding agent, and said polishing agent 3 consists of the polishing particles made of chromium oxide having a Mohs' hardness of 8.5 or so, and the bonding agent is made of vinyl chloride- vinyl acetate-vinyl alcohol. Therefore, the tape sliding surface of a magnetic head 4 can be smoothly polished without damaging the tape sliding surface by the polishing agent 3 having a proper hardness. Further, since only vinyl chloride-vinyl acetate-vinyl alcohol as three component copolymer having the superior dispersion performance is used as bonding agent, said polishing agent can be uniformly dispersed into the coating liquid, and the surface performance of the coated film can be improved.

52. 发明专利

JPS62146433A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS62146433A
公开(公告)日：1987-06-30
申请号：JP28893685
申请日：1985-12-20
申请人： FUJI PHOTO FILM CO LTD
发明人： MATSUFUJI AKIHIRO , KASUGA AKIRA , KOMINE SHIGEO , YAMADA YASUYUKI , MIYATSUKA HAJIME
IPC分类号： C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , C10M107/46 , C10N40/18 , G11B5/702 , G11B5/708 , G11B5/71
摘要： PURPOSE:To improve the dispersion condition of ferromagnetic powder in a magnetic layer and to smooth the surface of the magnetic layer by making combination use of at least two kinds of resin components into which polar groups are introduced for the binder of the magnetic layer formed to a magnetic recording medium and using a resin having a specific polar group for at least one thereof. CONSTITUTION:This magnetic recording medium contains a nonmagnetic substrate and the magnetic layer which is provided on the substrate and is formed by dispersing the ferromagnetic powder into the binder. The magnetic layer contains a fatty acid ester lubricating agent and lubricating agent except fatty acid ester and the binder consists of the resin components contg. the resin contg. the repeating unit having the polar group and having >=50 deg.C glass transition temp. and the resin contg. the repeating unit having the polar group and having

53. 发明专利

JPS61199240A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS61199240A
公开(公告)日：1986-09-03
申请号：JP3973385
申请日：1985-02-28
申请人： FUJI PHOTO FILM CO LTD
发明人： MIYOSHI TAKAHITO , AOKI NOBUO , YONEYAMA TAKASHI , KASUGA AKIRA , OKUTSU TOSHIMITSU , FUJIYAMA MASAAKI , OKUZAWA YASUTOSHI
IPC分类号： G11B5/708 , C09D5/23 , G11B5/71 , G11B5/714
摘要： PURPOSE:To obtain a magnetic recording medium having an electromagnetic conversion characteristic, running durability stable for a long period of time, etc. by providing a magnetic layer contg. ferromagnetic alloy powder having a specific average long axial length or below and contg. specific three kinds of fatty acids within a specific ratio range on a nonmagnetic base. CONSTITUTION:The magnetic layer contg. the ferromagnetic alloy powder having =7/1 and specific surface area is >=50m /g by a BET method and contg. at least three kinds of the fatty acids; 20-75wt% behenic acid, 10-45wt% stearic acid and 10-45wt% oleic acid is provided on the nonmagnetic base. The metallic component in the magnetic alloy powder is >=75wt% and >=80wt% of the metallic component is one kind of ferromagnetic metal or alloy, for example, Fe, Ni, Co and the alloy thereof, etc. The magnetic alloy powder may contain components such as Al, Si and P in addition to the above- mentioned metallic component. The magnetic recording medium which obviates an output decrease and clogging and has excellent durability is thus obtd.

54. 发明专利

JPS60234226A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS60234226A
公开(公告)日：1985-11-20
申请号：JP9012884
申请日：1984-05-08
申请人： FUJI PHOTO FILM CO LTD
发明人： MIYATSUKA HAJIME , KASUGA AKIRA , MATSUFUJI AKIHIRO
IPC分类号： G11B5/712 , C09D5/23 , C09D7/12
摘要： PURPOSE:To obtain a recording medium having improved oxidation resistance, high sensitivity and good S/N having a magnetic layer formed by treating the surfce of ferromagnetic metallic powder having respectively specific values or above of specific surface area and satd. magnetization with an org. compd. to improve dispersibility and incorporating the same into a binder. CONSTITUTION:The ferromagnetic metallic powder of Fe, Fe-Ni, Fe-Co-Ni, etc. having >=30m /g specific surface area BET and >=120emu/g satd. magnetization is dipped under stirring into an org. solvent soln. of fatty acid, metallic salt of fatty acid, Cr complex, isocyanate compd., and coupling agent and after resting for prescribed time, the powder is filtered and dried, by which the surface- treated powder is obtd. The magnetic layer is formed on a substrate by using the coating liquid prepd. by dispersing such surface-treated feffomagnetic powder into a binder resin soln. The dispersibility of the magnetic powder and the oxidation resistance by air and humidity are thus improved and the magnetic recording medium having an excellent squareness ratio, electromagnetic conversion characteristic, S/N ratio, etc. is obtd.

55. 发明专利

JPS59227026A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS59227026A
公开(公告)日：1984-12-20
申请号：JP10049983
申请日：1983-06-06
申请人： FUJI PHOTO FILM CO LTD
发明人： KASUGA AKIRA , YAMAMOTO NOBUYUKI , MIYATSUKA HAJIME
IPC分类号： G11B5/70 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/06 , G11B5/714 , G11B5/73 , G11B5/735
摘要： PURPOSE:To offer a magnetic recording medium whose video characteristic is excellent and whose durability and running property are good by consituting so that a specific surface area of a ferromagnetic metallic powder is large, a surface roughness of a magnetic layer is small, and also a coefficient of friction of the surface of the magnetic layer and the back layer is small. CONSTITUTION:The surface of a magnetic layer is smoothed and a noise is lowered by constituting so that a specific surface area of a ferromagnetic metallic powder measured by an N2 gas adsorbing method by a BET system becomes >=35m /gr. Also, in order to minimize a spacing loss, and in order to lower a noise, a surface roughness of the magnetic layer is set to

56. 发明专利

JPS51119204A MAGNETICALLY RECORDING ELEMENT 失效
公开(公告)号：JPS51119204A
公开(公告)日：1976-10-19
申请号：JP4401775
申请日：1975-04-11
申请人： FUJI PHOTO FILM CO LTD
发明人： KASUGA AKIRA , AKASHI GOROU , SUZUKI OSAMU
IPC分类号： G11B5/706 , C09D5/23 , C09D7/12 , G11B5/716 , H01F1/11
摘要： PURPOSE:Offer of a magnetically recoring element that eliminates the defects for selection of operating bias, equalizer, etc. and provides interchangeability to tape recorder, etc..

57. 发明专利

JP2002150528A MAGNETIC RECORDING TAPE 失效
公开(公告)号：JP2002150528A
公开(公告)日：2002-05-24
申请号：JP2000336990
申请日：2000-11-06
申请人： FUJI PHOTO FILM CO LTD
发明人： KASUGA AKIRA , INAMI HIROO , SUEKI MINORU
IPC分类号： G11B5/718
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording tape which can improve the resolution and obtain a high output and is capable of performing recording and reproducing with high reliability by lessening an off-track during traveling and a head clogging in spite of having narrow-width tracks. SOLUTION: This magnetic recording medium has a magnetic layer for information recording containing ferromagnetic powder and a binder on one surface of a nonmagnetic base and a magnetic layer for servo signal recording containing the ferromagnetic powder and the binder on another surface. The saturation magnetization quantity of the magnetic layer for servo signal recording is equal to or greater than the saturation magnetization quantity of the magnetic layer for information recording.

58. 发明专利

JPH11296839A MAGNETIC TAPE 失效
公开(公告)号：JPH11296839A
公开(公告)日：1999-10-29
申请号：JP10881198
申请日：1998-04-03
申请人： FUJI PHOTO FILM CO LTD
发明人： KASUGA AKIRA
IPC分类号： G11B5/70 , G11B5/73 , G11B5/735 , G11B5/78 , G11B5/704
摘要： PROBLEM TO BE SOLVED: To provide a magnetic tape which can realize a large recording capacity, does not generate string like shaving waste, has good running durability and electromagnetic conversion characteristic, and is advantageously used particularly for computer data recording. SOLUTION: A magnetic layer 13 having a thickness of 0.1 to 1.5 μm is provided on one side of a supporting body 11 through a nonmagnetic layer 12 having a thickness of 1.0 to 2.5 μm. On the other side of the body 11, a back coat layer 14 having a thickness of 0.1 to 1.0 μm is provided. The layer 14 is made of combined materials, dispersed into binder, including carbon black, calcium carbonate and an inorganic powder of a Mohs scale of 5 to 9. A magnetic tape 1 is made by slitting the layers 13 and 14 and the body 11 in their longitudinal direction. Then, define a peak point 17 which is located upward from the center line of the body 11 in the thickness direction along the slit cross section and is projected to the outside. A line 18 is vertically drawn from the peak point 17 along the slit cross section. Then define a thickness δ between the line 18 and the slit end face of the slit cross section of a back coat layer. In the tape 1, the thickness δ is set to be within 3 to 7 μm.

59. 发明专利

JPH11250611A MAGNETIC TAPE CASSETTE 失效
公开(公告)号：JPH11250611A
公开(公告)日：1999-09-17
申请号：JP7315298
申请日：1998-03-05
申请人： FUJI PHOTO FILM CO LTD
发明人： KASUGA AKIRA
IPC分类号： G11B23/087
摘要： PROBLEM TO BE SOLVED: To prevent drop-out even when a magnetic tape supporting material is composed of a material having a higher rigidity by arranging a non-woven cloth friction sheet between both surfaces of magnetic tape wound to a pair of flangeless type hubs and the internal wall surface of each cassette half. SOLUTION: A magnetic tape suitable for high density recording assuring a large recording capacity is formed as thin as 3 to 7 μm and is composed of a supporting material having comparatively higher rigidity such as aramide to obtain higher running durability. Non-woven cloth forming friction sheet is formed by thermally bonding the polyolefine-base, polyacryl-base and polyamide-base fiber as long as 2 to 9 μm. The desirable non-woven cloth has the tensile strength of 1.5 to 4.5 kg/15 mm, the width of 15 mm and sheet thickness of 0.2 to 0.55 mm. When the tape is running at a high speed, the fiber is less fuzzed and generates less amount of running dust and moreover dust generated from fiber gap is fetched to prevent re-adhering to the tape.

60. 发明专利

JPH1011736A MAGNETIC TAPE FOR RECORDING COMPUTER DATA 失效
公开(公告)号：JPH1011736A
公开(公告)日：1998-01-16
申请号：JP18566696
申请日：1996-06-26
申请人： FUJI PHOTO FILM CO LTD
发明人： HATTORI KOJI , KASUGA AKIRA , KAWAMATA TOSHIO
IPC分类号： G11B5/70 , G11B5/73 , G11B5/735
摘要： PROBLEM TO BE SOLVED: To provide a magnetic tape for recording computer data which is capable of attaining a high recording capacity and has excellent traveling durability and high reliability to recording and reading out of the data. SOLUTION: This magnetic tape has a nonmagnetic layer which is composed mainly of nonmagnetic powder and binder and is substantially nonmagnetic and has 0.5 to 2.0μm thickness and a magnetic layer which is composed mainly of ferromagnetic powder and binder and has 0.05 to 0.5μm thickness in this order on one side of a long-sized nonmagnetic base and has a back coating layer on the other side of the base. The Young's modulus in the longitudinal direction of the tape is >=1200kg/mm . The back coating layer contains soft inorg. powder having an average particle size of 30 to 50μm and Mohs hardness of 3 to 4.5 and hard inorg. powder having an average particle size of 80 to 250μm and Mohs hardness of 5 to 9. The overall thickness of the magnetic tape is

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