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1. 发明专利

JPH02223081A SHELL FOR MAGNETIC DISK 失效
公开(公告)号：JPH02223081A
公开(公告)日：1990-09-05
申请号：JP4149789
申请日：1989-02-23
申请人： FUJI PHOTO FILM CO LTD , FUJI MAGUNEDEISUKU KK
发明人： NAGASHIMA YASUO , NAKADA KOJI
IPC分类号： G11B23/033 , G11B19/00
摘要： PURPOSE:To attain smooth rotation even when a magnetic sheet is charged and to eliminate static electricity by providing an area having minute projection to the surface in the shell opposite to the recording face of the magnetic disk. CONSTITUTION:An area (mat face) 104 having minute projections is formed to an inner surface 103 of an upper shell 102 opposite to a nonrecording face of a magnetic disk 13. Thus, the magnetic disk 13 is charged and even when the magnetic disk 13 is in contact with the inner surface 103 of the upper shell 102, the disk is in press contact onto the tip of the projection of the mat face 104 to form a point to point contact, the sliding resistance is reduced and the charge is discharged. Thus, the charge of the magnetic disk is considerably reduced and smooth rotation is maintained.

2. 发明专利

JPS63112827A INSPECTING METHOD FOR MAGNETIC SHEET 失效
公开(公告)号：JPS63112827A
公开(公告)日：1988-05-17
申请号：JP25463286
申请日：1986-10-28
申请人： FUJI PHOTO FILM CO LTD , FUJI MAGUNEDEISUKU KK
发明人： NAGASHIMA YASUO , SATO MASAMICHI , SOEDA HARUO , YAMAGUCHI YUKIHIKO
IPC分类号： G11B5/84
摘要： PURPOSE:To prevent a magnetic powder from re-adhering to a magnetic sheet by forming a head chip so that its side face becomes roughly vertical to the magnetic surface of the magnetic sheet, and eliminating an accumulation of the magnetic powder to its side face. CONSTITUTION:A magnetic head 21 is formed by fixing a head chip 23 to a bedplate 22. Also, the tip shape of the head chip 23 is a columnar shape by which side faces 23b, 23c of both sides of a slide-contact surface 23a which is brought into slide-contact with a magnetic sheet 14 become roughly vertical to a magnetic surface 14a of the magnetic sheet 14. In such a way, even if a magnetic powder of the magnetic sheet 14 is scraped by the head chip 23, the magnetic powder is not accumulated on its side face 23c and 23b, and accordingly, re-adhesion to the magnetic sheet 14 of the magnetic powder is not generated either.

3. 发明专利

JPH0474350A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH0474350A
公开(公告)日：1992-03-09
申请号：JP18528890
申请日：1990-07-16
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO
IPC分类号： G11B17/32
摘要： PURPOSE:To quickly change recording and reproducing surfaces by providing a control member with an opening part through the atmosphere and providing a control valve for opening and closing the opening part. CONSTITUTION:At least one part 8 of the control member is provided with the opening part 10 through the stmosphere while the control valve 11 is provided to open and close the opening part 10. Now, the opening part 10 is desirable to be disposed on the upstream side from a magnetic head in the rotating direction for the purpose of introducing the atmosphere efficiently, and the control member possesses a recessed part to confine a generated negative pressure inside, where a magnetic head is desirable to be set up in this recessed part. In this case, since the negative pressure can be allowed to escape freely by opening and closing the opening part 10 provided to the control member 8 with the control valve 11, the recording and reproducing surfaces can quickly be changed without changing the rotating direction of a magnetic sheet. By this method, the operability of recording and reproducing over both sides is improved.

4. 发明专利

JPH03102618A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH03102618A
公开(公告)日：1991-04-30
申请号：JP33768789
申请日：1989-12-26
申请人： FUJI PHOTO FILM CO LTD
发明人： KATO MIKIHIKO , ENDO YASUSHI , NAGASHIMA YASUO , HASHIMOTO HIROSHI
IPC分类号： G11B5/702 , C09D5/23 , C09D175/00 , C09D175/06 , G11B5/706
摘要： PURPOSE:To obtain a magnetic layer having excellent traveling durability so that the magnetic recording medium having excellent electromagnetic conversion characteristics can be obtd. by incorporating a polyurethane resin consisting of specific polyester polyol as its main skeleton and a vinyl chloride copolymer at specific ratios into a binder resin. CONSTITUTION:Of the binder resin, 35 to 55wt.% is the polar group-contg. vinyl chloride polymer and 10 to 25wt.% is the polyurethane resin obtd. by the reaction of the polyester polyols which are the reactant of alicyclic dihydric alcohol/or arom. dihydric alcohol and alicyclic dicarboxylic and/or arom. dicarboxylic acid and >=1 kinds of the polyisocyalates. This polyurethane resin contains 0.03 to 2wt.% polar group selected from -SO3M, -COOM, -PO3M (M is H, Na, K atoms) and NH2. The binder resin is incorporated at 15 to 30wt.% into ferromagnetic metallic powder. The magnetic recording medium having the excellent traveling durability and electromagnetic conversion characteristics is obtd. in this way.

5. 发明专利

JPH02257482A MAGNETIC SHEET PACK AND MAGNETIC SHEET RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH02257482A
公开(公告)日：1990-10-18
申请号：JP8808089
申请日：1989-04-10
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO , MATSUMOTO TAKASHI , SAITO HITOSHI , MATSUO TOSHIHIKO
IPC分类号： G11B23/033 , G11B17/32 , G11B17/34
摘要： PURPOSE:To make a head touch excellent by providing a slanting surface inside a peripheral part of a window part of a protection case and generating a positive pressure or a negative pressure between a rotating magnetic sheet and this slanting surface. CONSTITUTION:When the slanting surfaces 12a and 12b opposite to a natural surface of the magnetic sheet 15 are provided to members to be elastically supported inside or from the peripheral part of at least one of the window parts 20 and 21 of the protection cases 12 and 13, the positive pressure or the negative pressure is generated between the rotating magnetic sheet 15 and these slanting surfaces 12a and 12b in accordance with the rotating direction. Thus, by utilizing these positive pressure and negative pressure, the magnetic sheet 15 is sucked up to be pressed against a magnetic head 24 so that the excellent head touch is obtained.

6. 发明专利

JPH01217756A REGULATING PLATE 失效
公开(公告)号：JPH01217756A
公开(公告)日：1989-08-31
申请号：JP4067188
申请日：1988-02-25
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO
IPC分类号： G11B17/34
摘要： PURPOSE:To ensure the abutting of a magnetic head against a magnetic sheet by providing a blocking part on a regulating plate to be protruded with its protrusion amt. increasing gradually in the upstream direction of the magnetic sheet in its rotation. CONSTITUTION:The regulating plate 31 is formed with a groove 32 for receiving the magnetic head, an upstream rib 33 on the upstream side of the rotational direction (direction of an arrow R) of the magnetic sheet and a downstream rib 34 on the downstream side across this groove 32, and moreover, the blocking part 35 is erected to be protruded to the side of the magnetic sheet on an outer edge part of the upstream rib 33 of the regulating plate 31, facing the outer periphery of the magnetic sheet. Since this blocking part 35 is gradually increased in its protrusion amt. in the upstream direction of the rotation of the magnetic sheet, so as to follow the bending deformation of the outer periphery of the magnetic sheet under the recording or reproducing state, the magnetic sheet is approached with its outer periphery to the blocking part 35. By this method, an airflow between the regulating plate and the magnetic sheet is prevented from leaking out, thus ensuring the abutting of the magnetic head against the magnetic sheet.

7. 发明专利

JPH01204268A CONTROL BOARD 失效
公开(公告)号：JPH01204268A
公开(公告)日：1989-08-16
申请号：JP2572488
申请日：1988-02-08
申请人： FUJI PHOTO FILM CO LTD
发明人： MIHASHI DAISUKE , NAGASHIMA YASUO , KAWASAKI NOBORU
IPC分类号： G11B17/34
摘要： PURPOSE:To obtain stable head touch by providing a projecting part, which presses the outer peripheral part of a magnetic sheet, in a control board and continuously or intermittently inclining the pressing surface of the projecting part more deeply in the inner peripheral side. CONSTITUTION:In the upstream side and downstream side of a groove-shaped recessed part 16 to be formed in the center of a control board 15, inclining surfaces 17 and 18 are respectively obtained and a projecting part 19 is provided on the outer peripheral side of the specifying board 15. Then, the magnetic sheet is pressed by this projecting part 19. The outer peripheral side of the projecting part 19 in a magnetic head moving direction is hollowed as a pressing surface 20 and made in a circular arc shape with step. Accordingly, when a magnetic head 4 slides and contacts a magnetic sheet 1 in the inner peripheral side, an outer peripheral part 20a and the magnetic sheet 1 smoothly is brought into contact and when the magnetic head 4 slides and contacts the magnetic sheet 1 in the outer peripheral side, an inner peripheral part 20b is smoothly brought contact with the magnetic sheet 1. Thus, even when the magnetic head 4 moves to the inner and outer peripheries, the stable head touch can be always obtained.

8. 发明专利

JPH01204266A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH01204266A
公开(公告)日：1989-08-16
申请号：JP2572688
申请日：1988-02-08
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO
IPC分类号： G11B17/32
摘要： PURPOSE:To obtain head touch to be always stable by energizing a magnetic sheet towards a magnetic head with positive pressure and simultaneously sucking the magnetic sheet with negative pressure. CONSTITUTION:When a magnetic sheet 11 is rotated since the inclining surface 14a of a negative pressure generating member 14 is inclined so as to be separated much more from the magnetic sheet 11 in a lower flow, the negative pressure is generated and the magnetic sheet 11 is sucked to a magnetic head 13. Simultaneously, since an inclining surface 16a of a positive pressure generating member 16 is inclined so as to be close to the magnetic sheet 11 much more in the lower flow, the positive pressure is generated and the magnetic sheet 11 is energized to the magnetic head 13. Thus, when the positive pressure and negative pressure are simultaneously operated and further, the positive pressure generating member is satisfactorily adjusted, the stable head touch can be always obtained in the whole area of a head moving range.

9. 发明专利

JPS6356817A MULTI-LAYER TAPE FOR MAGNETIC RECORDING 失效
公开(公告)号：JPS6356817A
公开(公告)日：1988-03-11
申请号：JP19911186
申请日：1986-08-27
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO
IPC分类号： G11B5/716 , C09D5/23 , C09D7/12 , G11B5/78
摘要： PURPOSE:To attain excellent cross recording by providing magnetic particles having the orientation direction arranged in one direction so as to record the 1st information efficiently and magnetic particles having the orientation direction arranged in the other direction recording the 2nd information efficiently in a rate of 50% each. CONSTITUTION:The 1st magnetic layer 13 formed by arranging the orientation direction of magnetic particles of a magnetic face in a direction and the 2nd magnetic layer 14 formed on the 1st magnetic layer 13 by arranging the orientation direction of the particles in other direction with a prescribed angle to the orientation direction of the 1st magnetic layer 13, are provided. In reproducing the information recorded on the 1st magnetic layer 13, since a large azimuth loss is accompanied with all sets of the information recorded on the 2nd magnetic layer 14 in the same degree, they are not almost reproduced, and in case of revesing, the revesing information is not almost reproduced. Thus, even if lots of kinds of information are recorded superimposingly on one magnetic face, each information is reproduced excellently without causing crosstalk.

10. 发明专利

JPS6334706A MAGNETIC RECORDING METHOD ON BOTH SIDES OF FLOPPY DISK 失效
公开(公告)号：JPS6334706A
公开(公告)日：1988-02-15
申请号：JP17571386
申请日：1986-07-28
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO , SATO MASAMICHI
IPC分类号： G11B5/02 , G11B5/012 , G11B5/48
摘要： PURPOSE:To record information on both the sides of a floppy disk without deteriorating mutual information by alternately forming respective circular tracks on both the recording surface of the floppy disk. CONSTITUTION:The positioning of magnetic heads 5, 6 is differentiated so that the circular tracks 10 on a front face 3 are shifted from the circular tracks 11 on a rear face 4 by 1/2 track, i.e. 50mum. Thereby, the circular tracks 10 on the front face 3 are opposed to the guard bands 13 of the rear face 4 just back to back and the circular tracks 11 on the rear face 4 are also opposed to the guard bands 12 of the front face 3 just back to back. Namely, the circular tracks 10 on to front face 3 and the circuit tracks 11 on the rear face 4 are alternately set up without being overlapped. In order to record information on both the front and rear faces 3, 4 of the floppy disk 1, either on of two magnetic heads 5, 6 is optionally selected to record the information on a required track.

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