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41. 发明专利

JPH0315258B2 失效
公开(公告)号：JPH0315258B2
公开(公告)日：1991-02-28
申请号：JP4015681
申请日：1981-03-19
申请人： FUJI PHOTO FILM CO LTD
发明人： YAMAGUCHI NOBUTAKA , TSUJI NOBUO , OKUZAWA YASUTOSHI , NASU KATSUO , FUJAMA MASAAKI
IPC分类号： G11B5/71 , C09D183/04 , G11B5/725 , G11B5/73 , G11B5/735
摘要： A magnetic recording medium is disclosed which is comprised of a non-magnetic support base having a magnetic layer on one surface and a silicone oil layer formed on the opposite surface. The silicone oil layer does not produce dropouts and eliminates scraping and therefore eliminates dust particles that collect and build up in the area of the magnetic head. The silicone layer is formed from a silicone-containing compound having a viscosity of at least 6,000 centistokes at 25 DEG C.

42. 发明专利

JPH01315081A FLEXIBLE MAGNETIC DISK 失效
公开(公告)号：JPH01315081A
公开(公告)日：1989-12-20
申请号：JP9662789
申请日：1989-04-17
申请人： FUJI PHOTO FILM CO LTD
发明人： KATO MIKIHIKO , OKITA TSUTOMU , KOMINE SHIGEO , OKUZAWA YASUTOSHI , MORITA KAZUHIKO
IPC分类号： G11B5/72 , C09D4/02 , G11B5/82 , G11B5/84 , G11B23/00
摘要： PURPOSE:To reduce the coefficient of friction and to load a flexible magnetic disk with no excentricity by producing a protecting layer by hardening a lubricative atomic group, a compound including the ester bond such as acrylic acid, and a mixture containing aromatic ketone with irradiation of the ultraviolet rays and preparing said protecting layer around the center hole of a magnetic disk. CONSTITUTION:A compound such as myristic acid denatured polyurethane acrylate, having the bond to a lubricative atomic group and the ester bond to acrylic acid or methacrylic acid is prepared at the end of a primary chain or a side chain of a molecule. Then benzyl methyl ketal, etc., containing aromatic ketone is mixed with said compound. This mixture is applied along the fringe of a center hole 2a of a flexible magnetic sheet 2 and polymerized and hardened with irradiation of the ultraviolet rays. Thus the coefficient of friction is reduced and therefore a flexible magnetic disk can be loaded into a writing/ reading device with no eccentricity even with the eccentricity caused between the hole 2a and an opening part 1a of a rectangular jacket 1.

43. 发明专利

JPS60182576A FLEXIBLE MAGNETIC DISK 失效
公开(公告)号：JPS60182576A
公开(公告)日：1985-09-18
申请号：JP3826184
申请日：1984-02-29
申请人： FUJI PHOTO FILM CO LTD
发明人： KATOU MIKIHIKO , OKUZAWA YASUTOSHI , KOMINE SHIGEO , MORITA KAZUHIKO
IPC分类号： G11B23/00 , C09D175/14 , G11B5/82
摘要： PURPOSE:To enable loading of a magnetic disk to a driving device always without eccentricity by providing a protective layer which is polymerized and cured by irradiation of radiations and has specific roughness to the peripheral edge at the central circular hole of a flexible magnetic disk. CONSTITUTION:A protective layer 11 which can be cured by radiations such as electron rays, UV rays, etc. and more particularly preferably UV rays is formed of a compd. which has the ester bond with (meth)acrylic acid in at least one of the molecular principal chain terminal and side chain, of which the number of said bond is 1-10 pieces for each 1,000mol.wt. and in which the skeleton of the principal chain is polyester, polyurethane, polycarbonate, polyether, epoxy resin or the mixture thereof on both front and rear surfaces along the peripheral edge of the central circular hole 10a of a flexible magnetic disk 10. The protective layer 11 is so formed that the surface roughness thereof has >=0.03mu average roughness of the centerline at cut off 0.25mm.. The disk 10a is thus loaded to the driving device without eccentricity and is driven without off-tracking, etc.

44. 发明专利

JPS60109031A FLEXIBLE MAGNETIC DISK 失效
公开(公告)号：JPS60109031A
公开(公告)日：1985-06-14
申请号：JP21684783
申请日：1983-11-17
申请人： FUJI PHOTO FILM CO LTD
发明人： KATOU MIKIHIKO , KOMINE SHIGEO , OKUZAWA YASUTOSHI , MORITA KAZUHIKO
IPC分类号： C09D163/00 , C09D175/04 , G11B5/72 , G11B5/82 , G11B23/00 , G11B23/02 , G11B23/033
摘要： PURPOSE:To load a flexible magnetic disk sheet on a writing and reading device without any eccentricity by forming a protection layer of a composite material containing an ultraviolet-ray setting compound incorporating an unsaturable bond over one surface of the circumferential edge of the center circular hole of the flexible magnetic disk sheet, and providing a ring for reinforcement on the other surface. CONSTITUTION:The composite material containing the unsaturable bond capable of being polymerized with ultraviolet rays is printed through a screen on one surface 9 of a flexible magnetic disk sheet 2 to form a protection layer 6 at the circumference of a disk center hole 2a. Further, a reinforcing ring 5 made of plastic paper of polyester, etc., is provided on the surface of the disk opposite to the protection layer 6. Consequently, the disk sheet 2 is put in a jacket 1 at a correct position and loaded without any deformation such as eccentricity, i.e. without causing any position shift in the reading device.

45. 发明专利

JPS6079531A MANUFACTURE OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS6079531A
公开(公告)日：1985-05-07
申请号：JP18557983
申请日：1983-10-04
申请人： FUJI PHOTO FILM CO LTD
发明人： OKUZAWA YASUTOSHI , MASUYAMA KENICHI
IPC分类号： G11B5/845 , G11B5/842
摘要： PURPOSE:To always execute magnetic field orientation processing to a coated film being in an immediately previous state of drying and solidification, by irradiating measuring light to the coated film, also measuring the reflected light quantity from the coated film, and controlling a drying means in accordance with its measuring result. CONSTITUTION:The reflected light quantity from a coated film holds a roughly constant value which is comparatively small under a state that the coated film is undried, increases suddenly and holds the maxinum value immediately before the drying is completed, and drops and holds a roughly constant value again when the drying is completed. Reflected light quantity signals S1, S2 and S3 outputted by three detecting devices 20, 30 and 40 are inputted to a drying means controlling circuit 50, and control valves 15, 16 and 17 are operated by valve control signals S11, S12 and S13 outputted from the controlling circuit 50 basing on these S1, S2 and S3. The controlling circuit 50 compares S1, S2 and S3, and adjusts an opening of the control valves 15, 16 and 17 so that S2 (the reflected light quantity of a point B) becomes more than S1 (the reflected light quantity of a point A) and S3 (the reflected light quantity of a point C), by which a coated film 5' being in an immediately previous state of completion of drying passes through the inside of an orientation magnet.

46. 发明专利

JPS6076647A METHOD FOR DETECTING DRYNESS DEGREE OF APPLIED FILM 失效
公开(公告)号：JPS6076647A
公开(公告)日：1985-05-01
申请号：JP18558083
申请日：1983-10-04
申请人： FUJI PHOTO FILM CO LTD
发明人： OKUZAWA YASUTOSHI , MASUYAMA KENICHI
IPC分类号： G01N21/47
摘要： PURPOSE:To detect the state of an applied film immediately before the perfet drying accurately, by applying a liquid to be applied, wherein solid particles are mixed on the surface of a substrate, projecting measuring light on the applied film, detecting the amount of the reflected light, and detecting the maximum value of the amount of the reflected light. CONSTITUTION:A liquid to be applied includes solid particles. The liquid is applied on a substrate 30, and the dryness degree of the applied film 31 is detected. At this time, a sensor 25 is arranged so that the tip surface of the sensor faces the applied film 31. External light is shielded by a light shielding member 32 as required. Then, a light emitting element 21 is actuated, and measuring light Le is projected on the applied film 31 from a fiber tube tip surface 23a. The measuring light Le is reflected by the applied film 31. The reflected light Lr is inputted to a fiber tube 24 through a fiber tube tip surface 24a and guided to a light receiving element 22 through the fiber tube 24.

47. 发明专利

JPS5823325A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS5823325A
公开(公告)日：1983-02-12
申请号：JP4015681
申请日：1981-03-19
申请人： FUJI PHOTO FILM CO LTD
发明人： YAMAGUCHI NOBUTAKA , TSUJI NOBUO , OKUZAWA YASUTOSHI , NASU KATSUO , FUJIYAMA MASAAKI
IPC分类号： G11B5/71 , C09D183/04 , G11B5/725 , G11B5/73 , G11B5/735
摘要： PURPOSE:To obtain a medium without increase of dropout, with less generation of white powder due to shaping of a supporting body, and less head choking, by providing a layer of silicone oil at the back of the supporting body. CONSTITUTION:At the back side of a supporting body such as a polyester film having a magnetic substance layer and magnetic thin film dispersed in a binder with magnetic substance particles, a silicone oil or preferably highly viscous silicone oil such as dimethyl polysiloxane, methylphenyl polysiloxane or polysiloxane containing fluorine is coated with 0.5-20mg/m .

48. 发明专利

JPS5774828A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：JPS5774828A
公开(公告)日：1982-05-11
申请号：JP14913380
申请日：1980-10-24
申请人： Fuji Photo Film Co Ltd
发明人： SATOU MASAMI , OKUZAWA YASUTOSHI , HIBINO NOBUROU
IPC分类号： C09D5/23 , C09D7/12 , G11B5/70 , G11B5/73
CPC分类号： G11B5/70 , Y10S428/90 , Y10T428/31678
摘要： PURPOSE: To prevent the tape damage, by constituting a magnetic recording medium so that a coefficient of friction of the paired loading post axial direction in the width direction of the reverse side of a magnetic layer of a magnetic tape becomes a value which satisfies a specific relational expression to stiffness of a tape in the width direction.
CONSTITUTION: In a VTR magnetic tape, in case of a tape whose whole thickness is ≤15.5μ it is manufactured so that a coefficient of friction μB of the direction of a paired loading post axis 2 in the width direction of the reverse side of a magnetic layer of a tape 1 satisfies the relation to stiffness in the width direction of the tape 1 as shown by the expression. The coefficient of friction μB is measured by bringing a tape whose width is 0.5 inch into contact with a loading post at a touch angle of 190W195 degrees, and in 200g load, 0.5mm/sec tape moving speed, 25°C measured atmosphere and 65% relative humidity. As for a tape satisfying said condition, the tape damage is improved remarkably, and it is excellent in durability and is suitable for high density recording.
COPYRIGHT: (C)1982,JPO&Japio
摘要翻译：目的：为了防止磁带损坏，通过构成磁记录介质，使得磁带的磁性层的相反侧的宽度方向上的一对装载柱轴向的摩擦系数成为满足特定关于宽度方向上磁带刚度的关系表达式。构成：在VTR磁带中，在整体厚度<= 15.5mu的带的情况下，制造成使一对负载柱轴线2的方向的宽度方向的摩擦系数μB 如表达式所示，带1的磁性层满足与带1的宽度方向的刚度的关系。摩擦系数μB通过将宽度为0.5英寸的带与190-195度的接触角的装载柱接触，并且以200g负载，0.5mm./sec带移动速度，25℃ 测量气氛和65％相对湿度。对于满足所述条件的胶带，胶带损伤显着改善，耐久性优异，适用于高密度记录。

49. 发明专利

JPH06342575A MAGNETIC TAPE CASSETTE 失效
公开(公告)号：JPH06342575A
公开(公告)日：1994-12-13
申请号：JP8795294
申请日：1994-04-01
申请人： FUJI PHOTO FILM CO LTD
发明人： DOSHITA HIROAKI , OKUZAWA YASUTOSHI , ISHIGURO TADASHI , TSUNODA TAKESHI , KATO KAZUO
IPC分类号： G11B23/087 , B82B1/00
摘要： PURPOSE:To surely prevent the occurrence of electrostatic charge by forming a magnetic tape supporting body with a prescribed material and making the surface characteristic of the supporting body to a prescribed value. CONSTITUTION:A magnetic tape 19 is wound to a take-up reel 23 from a feeding reel 22 through a tape guide 1. The supporting body (base) of the tape 19 is formed by polyethylene telephthalate or polyethylene naphthalate. A surface resistivity value RS of the supporting body is made so that RS>=10 OMEGA/m . Moreover, the guide 1 is made of a stainless material or an aluminum material and the surface roughness of the outer peripheral of the guide 1 is set so that the height from the reference surface roughness value Rrms is made less than 60nm. By adjusting the surface resistivity value RS of the supporting body of the tape 19 and the surface characteristics of the guide 1, the electrostatic potential of the back surface of the tape 19 caused by the sliding motion of the guide 1 and the back surface of the tape 19 is controlled to less than -40V. Thus, the occurrence of electrostatic charge is surely prevented.

50. 发明专利

JPH0458571B2 失效
公开(公告)号：JPH0458571B2
公开(公告)日：1992-09-17
申请号：JP18558083
申请日：1983-10-04
申请人： FUJI PHOTO FILM CO LTD
发明人： OKUZAWA YASUTOSHI , MASUYAMA KENICHI
IPC分类号： G01N21/47

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