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21. 发明专利

JPS60125915A AZIMUTH CONTROL METHOD OF MAGNETIC HEAD 失效
公开(公告)号：JPS60125915A
公开(公告)日：1985-07-05
申请号：JP23314383
申请日：1983-12-10
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO
IPC分类号： G11B5/56
摘要： PURPOSE:To control an azimuth in a simple way within a range which causes no practical difficulty by shifting a magnetic head in the direction rectangular to the radius direction of a magnetic sheet. CONSTITUTION:A magnetic head 46 having a tilt angle thetaa preadjusted within a prescribed allowance range is attached to a head carriage 42 to perform the primary control. An azimuth shift can be controlled within a prescribed range by turning a control tool 86 and moving the head 46 in the direction (B) rectangular to the radius direction of the head 46. If the head 46 has an azimuth error alpha, the head 46 is shifted to a position B which is distant away from a position A of the most inner circumference track (radius Rmin) by a distance d(Rmin X tanalpha) with which the error alpha is substantially set at zero. The azimuth error is produced as the head 46 comes closer to the most outer circumference track (radius Rmax). Then the azimuth error (a) is maximum at a position C. In this case, a residual azimuth error (a) of the most outer track can be practically ignored in view of the mechanical working accuracy.

22. 发明专利

JPS59215024A Flexible magnetic disc 失效
标题翻译：柔性磁性碟
公开(公告)号：JPS59215024A
公开(公告)日：1984-12-04
申请号：JP8909983
申请日：1983-05-23
申请人： Fuji Photo Film Co Ltd
发明人： NAGASHIMA YASUO , KASUGA AKIRA
IPC分类号： G11B5/73 , G11B5/82 , G11B5/70
CPC分类号： G11B5/825 , Y10T428/265 , Y10T428/31518
摘要： PURPOSE:To realize stable and excellent head contact by specifying the product of the Young's modulus and the 3rd power of the total thickness. CONSTITUTION:In taking the unit of the total thickness (t) of the entire magnetic sheet including a base material layer as a support, a magnetic recording material layer and a balance coat layer as required as omega and the unit of the entire Young's modulus E as g/omega , the magnetic sheet is constituted so as to give any value between the lower limit value 2.5g.omega and the upper limit value 17g.mm., inclusive both limit values in the product of the Young's modulus E and the 3rd power of the total thickness (t), i.e., Et . In satisfying these conditions, since the relief of the magnetic sheet is increased even if the push amount of the head is increased, the contact pressure of the head is not substantially increased. Thus the life of the magnetic head and sheet is not lost. Since the magnetic sheet is soft and flexible, even if the pushing amount of the head is increased, the contact area of the head and the sheet is not increased.
摘要翻译：目的：通过指定杨氏模量和总厚度的第三功率的乘积来实现稳定和优良的头部接触。构成：以包含基材层作为载体的整个磁性片的总厚度（t）的单位，根据需要的磁记录材料层和余量涂层作为Ω，以及整个杨氏模量E的单位作为g /ω2，磁片被构造成在下限值2.5g.omega和上限值17g.mm之间给出任何值，包括杨氏模量E的乘积的两个极限值和总厚度（t）的三次幂，即Et 3。在满足这些条件的情况下，即使提高了磁头的推压量，也增加了磁片的浮雕，所以头部的接触压力基本上不增加。因此，磁头和片材的寿命不会丢失。由于磁性片是柔软且柔软的，所以即使头部的推压量增加，头部和片材的接触面积也不会增加。

23. 发明专利

JPS5524672A SIZE AND RIGHTTANGULARITY METER FOR SHEET 失效
公开(公告)号：JPS5524672A
公开(公告)日：1980-02-21
申请号：JP9825978
申请日：1978-08-11
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO , SHIMIZU SHIGEHISA
IPC分类号： G01B11/02 , G01B11/26 , G01B21/20
摘要： PURPOSE:To simultaneously measure the size and right-angularity of a sheet through a simple operation from the output of a detector by providing a guide, which is at a right angle while acting as a standard guide plane 32, such that one detector is movably arranged at the right angle corner and that one detector is movably arranged at each of the two longitudinal and transverse sides. CONSTITUTION:There is erected on a surface 51 to e measured a guide 33 which is at a right angle while having a standard guide plane 32 and which is equipped with a detector 40 at its right angle corner and two slidable detectors 41 and 42 at the longitudinal and transverse sides. Along the guide 33, there is formed at a desired portion of the surface 51 a hole 34, through which the light of a projecting unit 31 is guided into the upper detector. The detector is equipped with two sensors 36 and 36' which receive through the hole 34 and light from the projecting unit 31 so that they generate outputs which are different in accordance with the standard plane when the sheet to be measured is pushed onto the guide plane 32. Moreover, the guide 33 is equipped with a paper holder 43 so that the sheet is accurately pushed onto the plant to be measured. Thus, the size and right-angularity of the sheet are simultaneously measured by the outputs of the detectors 40, 41 and 42 while moving the movable detectors 41 and 42.

24. 发明专利

JPH0512654A FLEXIBLE MAGNETIC DISK AND PRODUCTION THEREOF 失效
公开(公告)号：JPH0512654A
公开(公告)日：1993-01-22
申请号：JP16159091
申请日：1991-07-02
申请人： FUJI PHOTO FILM CO LTD
发明人： SHIRAHATA RYUJI , NAGASHIMA YASUO , SAITO HITOSHI
IPC分类号： G11B5/718 , C09D5/23 , G11B5/73 , G11B5/82 , G11B5/84 , G11B5/842
摘要： PURPOSE:To obtain excellent reproduced images which are small in jitters by specifying the surface resistance of magnetic layers to a prescribed value or below. CONSTITUTION:This flexible magnetic disk is constituted by providing magnetic layers on both surfaces of a disk-shaped high-polymer base. The surface resistance of the magnetic layers is specified to OMEGA/square. The sheet-shaped medium provided with these magnetic layers is heat treated under the conditions of equation I. In the equation, X: heat treating time (hour), Y: heat treating temp. ( deg.C), Z: relative humidity (%RH). The flexible magnetic disk produced in such a manner provides a good head touch even with a novel still video system and can form the excellent reproduced images having the small jitters even with a still video system constituted by adopting a drive mechanism for which a spindle motor of particularly small torque is used.

25. 发明专利

JPH02193314A MAGNETIC DISK 失效
公开(公告)号：JPH02193314A
公开(公告)日：1990-07-31
申请号：JP1125889
申请日：1989-01-20
申请人： FUJI PHOTO FILM CO LTD
发明人： KATO MIKIHIKO , ENDO YASUSHI , YAMADA YASUYUKI , NAGASHIMA YASUO
IPC分类号： G11B5/706 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/06 , G11B5/82
摘要： PURPOSE:To improve traveling durability of a magnetic disk at low temp. by specifying the coefft. of dynamic loss of the magnetic layer to a specific range. CONSTITUTION:The magnetic layer essentially comprising ferromagnetic metal powder (e.g. Fe-Ni powder) and a binder resin (A) is provided on a nonmagnetic supporting substance to constitute the magnetic disk. The coefft. of dynamic loss factor (tandelta) of the magnetic layer is specified to 2X10 - 8X10 at 110Hz with increasing temp. from -5 to 15 deg.C by 2 deg.C/min. The resin A used for the magnetic layer comprises three components, vinyl chloride copolymer having polar functional groups such as -COOM (M represents H or metal) in its molecule, polyurethane having two or more -OH groups and trifunctional polyisocyanate. The disk is manufactured by punching a master plate and then heat treating at a desired temp.

26. 发明专利

JPH01133201A MAGNETIC RECORDING SYSTEM 失效
公开(公告)号：JPH01133201A
公开(公告)日：1989-05-25
申请号：JP28958687
申请日：1987-11-18
申请人： FUJI PHOTO FILM CO LTD
发明人： MATSUMOTO TAKASHI , NAGASHIMA YASUO , TAKESA TAICHI
IPC分类号： G11B5/02 , G11B20/02 , H04N9/797 , H04N9/80 , H04N9/815 , H04N9/86
摘要： PURPOSE:To obtain a picture of a high resolution and a high definition by dividing a luminance signal to a high frequency component and a low frequency component, mixing the signal of the low frequency component with a chrominance signal, recording and recording the high frequency component on an adjacent guard band. CONSTITUTION:The luminance signal Y is separated to the signal component YL of the low frequency and the signal component YH of the high frequency by defining a frequency (about 4MHz) to be a border. The component YL is modulated in an FM modulation circuit 34 to have a YL-RF signal, this signal and a chrominance signal C-RF signal is mixed in an adder circuit 36, amplifier, and thereafter applied to a change-over switch 39. Similarly, the component YH is modulated in an FM modulation circuit 24 to have a YH-RF signal, amplified and then applied to a change-over switch 29. Initially, a main signal is recorded on a first track by a head 1 and the YH-RF signal is recorded on the guard band by a head 2. Then, the main signal is recorded on a second track by a head 3 and the YH-RF signal is recorded on the guard band by a head 4.

27. 发明专利

JPS6430064A BOTH-SIDED RECORDING METHOD 失效
公开(公告)号：JPS6430064A
公开(公告)日：1989-01-31
申请号：JP18558687
申请日：1987-07-27
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO
IPC分类号： G11B17/32
摘要： PURPOSE:To instantaneously switch a recording face contactlessly with a floppy disk by inclining guide plates to generate negative or positive pressure, and attracting or energizing the floppy disk to either one of magnetic heads to record data on both sides of the floppy disk. CONSTITUTION:The 1st magnetic head 12 is separated from the floppy disk 11 by a distance longer than the separating distance of the 2nd magnetic head 13. On the other hand, the guide plates 14, 15 are arranged on the upstream side and downstream side of the 1st magnetic head 12. The guide plates 14, 15 are inclined to generate negative or positive pressure and the floppy disk 11 is attracted or energized to either one of the magnetic heads 12, 13 opposed by placing the disk 11 between them to record data on both sides of the disk 11. Consequently, the recording faces can be instantaneously switched contactlessly with the floppy disk 11.

28. 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.

29. 发明专利

JPH0479069B2 失效
公开(公告)号：JPH0479069B2
公开(公告)日：1992-12-14
申请号：JP8909983
申请日：1983-05-23
申请人： FUJI PHOTO FILM CO LTD
发明人： NAGASHIMA YASUO , KASUGA AKIRA
IPC分类号： G11B5/73 , G11B5/82

30. 发明专利

JPH02276019A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH02276019A
公开(公告)日：1990-11-09
申请号：JP31155989
申请日：1989-11-30
申请人： FUJI PHOTO FILM CO LTD
发明人： ENDO YASUSHI , KATO MIKIHIKO , NAGASHIMA YASUO , YAMADA YASUYUKI
IPC分类号： G11B5/706 , C09D5/23 , C09D7/12 , C09D127/04 , C09D127/06 , C09D175/06 , C10M105/34 , C10M105/38 , C10N40/18 , G11B5/708
摘要： PURPOSE:To obtain the magnetic recording medium having a high recording density and excellent traveling durability by specifying the content of a lubricant with respect to ferromagnetic metal powder in a magnetic layer by the specific surface area of the ferromagnetic metal powder. CONSTITUTION:The magnetic layer essentially consisting of the ferromagnetic metal powder and a binder resin is provided on a nonmagnetic base. The content Y(weight %) of the lubricant with respect to the ferromagnetic powder in the magnetic layer is specified to a 0.055S+5.5 =30(m /gr) and /gr). The content gamma is specified to a 0.06S+4.7 =50(m /gr) and /gr). The high-density recording is attained and traveling durability is improved in this way.

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