专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

81. 发明专利

JPH02166618A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH02166618A
公开(公告)日：1990-06-27
申请号：JP32508188
申请日：1988-12-20
申请人： FUJITSU LTD
发明人： NAITO KAZUNORI , NUMATA TAKEHIKO , HASHIMOTO YASUNOBU , NARUMI TOSHIKATSU
IPC分类号： G11B11/10 , G11B7/00 , G11B7/0045 , G11B11/105
摘要： PURPOSE:To prevent the annihilation of already recorded information by stopping recording when a tracking error signal exceeds a threshold value (the value anticipating a certain level at which there is possibility of off-tracking), determining the case of off-tracking as a disk error and starting alternate selection if the off-tracking does not arise at the time of signal recording. CONSTITUTION:The tracking error signal from a head 2 is monitored and is compared with the threshold value by a comparator 3. The tracking error signal is sent as an error detection signal to a control circuit 4 when this signal is larger than the threshold value. A recording circuit control signal (recording stop signal) is sent from the control circuit 4 to the recording circuit 5 and the recording of the head 2 is stopped by an LD drive signal when the error is detected. The erroneous memory by a defect is prevented in this way and the annihilation of the already recorded information is averted. The reliability of the disk is thus improved.

82. 发明专利

JPH0250376A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH0250376A
公开(公告)日：1990-02-20
申请号：JP20073388
申请日：1988-08-11
申请人： FUJITSU LTD
发明人： NANBA YOSHIYUKI , FUKUSHIMA SHIGERU , NARUMI TOSHIKATSU
IPC分类号： G11B23/02 , G11B17/038 , G11B23/00 , G11B23/03 , G11B23/50 , G11B33/14
摘要： PURPOSE:To prevent the lack of a lubricant in an internal peripheral part during the high speed rotation of a magnetic disk by composing an annular spacer positioned on the annular section between a rotation axis and a disk substrate of non-magnetic porous ceramics containing the liquid lubricant. CONSTITUTION:An annular spacer 3 positioned between a disk substrate 1, where a magnetic paint film obtained by linking magnetic powders by a thermosetting resin is formed, and a rotation axis 2 is sufficiently soaked into the lubricant, and the annular spacer 3 is made into the porous ceramics so that the lubricant infiltrates during the use of the magnetic disk 1 little by little for a long time. Consequently, the lubricant infiltrates out of the annular spacer 3 little by little, and it is supplied through the surface of the magnetic disk 1 to the internal peripheral paint film. Thus, the lubricant in the internal peripheral part is prevented from being insufficient during the high-speed rotation of the magnetic disk 1.

83. 发明专利

JPS6470944A MAGNETO-OPTICAL DISK 失效
公开(公告)号：JPS6470944A
公开(公告)日：1989-03-16
申请号：JP22700287
申请日：1987-09-10
申请人： FUJITSU LTD
发明人： FUKUSHIMA SHIGERU , NARUMI TOSHIKATSU , ITO KENICHI
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To endure a surface lubricating ability by applying the mixed liquid of the thermosetting resin and a material not related to a hardening reaction onto a protecting film, baking it under an optimum temperature, and impregnating a lubricant having a reactive group to the hole extracted the material not related to hardening. CONSTITUTION:A paint film mixed a material not related to the thermosetting reaction, for example, a paraffin with a thermosetting resin, for example, an epoxy resin is baked under the temperature of not more than that which becomes a complete hardening. Next, by using a solvent, the paraffin is removed and a resin film 7 having a reactive group and forming a bore 6 on the surface is obtained. Continuously, after a lubricant 8 having the reactive group is applied and impregnated, the reaction is executed at the temperature in which the resin is completely hardened, both are bonded and a second protecting film 5 is obtained. By the constitution like this, the scattering of the lubricant of the second protecting film 5 for head crash is prevented, and the endurance of the lubricant of the surface can be executed.

84. 发明专利

JPS6467720A PRODUCTION OF MAGNETIC DISK 失效
公开(公告)号：JPS6467720A
公开(公告)日：1989-03-14
申请号：JP22605787
申请日：1987-09-09
申请人： FUJITSU LTD
发明人： FUKUSHIMA SHIGERU , NARUMI TOSHIKATSU , NANBA YOSHIYUKI , ITO KENICHI
IPC分类号： G11B5/82 , C09D5/23 , G11B5/73 , G11B5/84
摘要： PURPOSE:To thinly form a perpendicularly oriented magnetic Ba film by discharging a magnetic coating compd. from the inside circumferential part to the outside circumferential part of a disk substrate to coat said compd. on the substrate while changing the rotating speed of the substrate continuously in such a manner that the specified linear circumferential speed is maintained in the position of a nozzle port for discharging the magnetic coating compd., thereby forming the magnetic film. CONSTITUTION:The magnetic coating compd. is dropped always at the specified linear circumferential speed by shifting the dropping position of the magnetic coating compd. gradually from the inside circumferential part to the outside circumferential part and changing the linear circumferential speed gradually according to the dropping position. Namely, the rotating speed of the substrate is gradually lowered as the dropping positions shifts from the inside circumferential part to the outside circumferential part. The formation of the coated film is, therefore, executed while the outside edge part of the coated film which is previously half cured by the solvent of the coating compd. dropped afterward. The film thickness is thereby reduced.

85. 发明专利

JPS63222349A MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPS63222349A
公开(公告)日：1988-09-16
申请号：JP5415587
申请日：1987-03-11
申请人： FUJITSU LTD
发明人： TAKAHASHI JUN , FUKUSHIMA SHIGERU , NARUMI TOSHIKATSU , ITO KENICHI , OGAWA SEIYA
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To prevent the crushing of a disk by a magnetic head by forming a coated film of an org. or inorg. thermosetting material having micropores filled with liq. lubricant on the surface of the disk as a crushing preventing film. CONSTITUTION:A first protective film 3, a magneto-optical recording layer 4 and a second protective film 5 are laminated on a glass substrate 1 having a pregrouped pattern 2. The film 5 is coated with a mixed soln. contg. thermoset ting phenol resin and liq. paraffin and the resin is cured by heating to form a crushing preventing film 6. The resulting laminated medium is rotated to extract the uncured liq. paraffin and to make micropores 7. The pores 7 are filled with a general liq. lubricant. Since the film 6 having the lubricant-filled micropores 7 is formed, the crushing of the medium by a magnetic head is prevented and overwriting is enabled.

86. 发明专利

JPS62285228A PRODUCTION OF MAGNETIC DISK 失效
公开(公告)号：JPS62285228A
公开(公告)日：1987-12-11
申请号：JP12974586
申请日：1986-06-04
申请人： FUJITSU LTD
发明人： TAKAHASHI ATSUSHI , TAKAHASHI JUN , FUKUSHIMA SHIGERU , NARUMI TOSHIKATSU
IPC分类号： G11B5/72 , C09D5/23 , C09D7/12 , G11B5/82 , G11B5/842
摘要： PURPOSE:To enable uniform dispersion and to suppress the increase of medium noise by subjecting inorg. material powder to a surface treatment with a titanate coupling agent and using the same. CONSTITUTION:The titanate is used as the coupling agent and the coupling of a reinforcing material such as aluminum powder and binder resin is executed by using such agent, by which the uniform dispersion is attained. The reason for using the titanate coupling agent lies in that the titanate coupling agent exhibits an excellent effect to all inorg. material while a silane coupling agent exhibits an excellent coupling effect to silicon inorg. materials such as glass and silica (SiO2) but does not exhibit the good effect to the other materials.

87. 发明专利

JPS62236133A HORIZONTALLY ORIENTED MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS62236133A
公开(公告)日：1987-10-16
申请号：JP7917086
申请日：1986-04-08
申请人： FUJITSU LTD
发明人： TAKAHASHI JUN , FUKUSHIMA SHIGERU , NARUMI TOSHIKATSU , OGAWA SEIYA , ITO KENICHI
IPC分类号： G11B5/706 , C09D5/23 , C09D7/12
摘要： PURPOSE:To reduce the noise of the titled medium by incorporating plate magnetic powder and further the powder mixed in the plate magnetic powder as a filler into a magnetic film. CONSTITUTION:The magnetic film contains plate magnetic powder 1 and the powder 2 mixed in the powder 1 as a filler. The axis easy for magnetization 5 of the plate magnetic powder in the magnetic film is horizontally oriented, and the plate surface of the magnetic powder is arranged almost vertically to a substrate 4 in the horizontally oriented magnetic recording medium. Since the mixed powder 2 fills the gap between the sparsely arranged magnetic powder, the formation of pinholes 3 is prevented. The ratio of the major axis to the plate thickness is controlled to >=3.5, the major axis is appropriately adjusted to 0.1-0.3mum, and the diameter of the mixed powder is appropriately regulated to 0.05-0.4mum. The amt. of the powder to be mixed is preferably controlled to 10-30wt%, based on the total weight of the powder and the magnetic powder.

88. 发明专利

JPS6240619A CLEANING METHOD FOR MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS6240619A
公开(公告)日：1987-02-21
申请号：JP18080685
申请日：1985-08-17
申请人： FUJITSU LTD
发明人： FUKUSHIMA SHIGERU , TAKAHASHI JUN , NARUMI TOSHIKATSU
IPC分类号： B08B3/12 , G11B5/84
摘要： PURPOSE:To permit cleaning with the decreased error defects for a reproduction signal without spoiling mechanical strength by immersing a disk into an ultrasonic cleaning tank mounted with a magnet in the bottom and removing the residue produced in the polishing stage. CONSTITUTION:An ultrasonic oscillator is mounted to a soln. tank 2 for isopropyl alcohol, etc. and the magnet 3 is attached to the base thereof. Cleaning is executed by immersing the disk substrate 1 with which the polishing for smoothing is completed into the solvent tank, ultrasonically cleaning the disk substrate for 1-3min by the oscillator, then pulling up the disk from the tank 2 and lightly wipe the surface with a cloth moistened with alcohol. Since the magnet 3 is mounted to the bottom, the residue of polishing suspended in the solvent is quickly collected and separated. The cleaning with the decreased error defects for the reproduction signal and with the excellent mechanical strength is thus made possible.

89. 发明专利

JPS61276123A PRODUCTION OF MAGNETIC DISK 失效
公开(公告)号：JPS61276123A
公开(公告)日：1986-12-06
申请号：JP10763585
申请日：1985-05-20
申请人： FUJITSU LTD
发明人： TAKAHASHI JUN , FUKUSHIMA SHIGERU , NARUMI TOSHIKATSU
IPC分类号： G11B5/845
摘要： PURPOSE:To detect an unstrained waveform by spin-coating a magnetic paint consisting essentially of Ba ferrite magnetic powder on a nonmagnetic substrate, alternately applying a vertical magnetic field and a horizontal magnetic field while rotating the substrate at low speed to orient the magnetic powder and then drying the paint while applying a horizontal magnetic field. CONSTITUTION:Since Ba ferrite is a hexagonal plate crystal and can be easily oriented in the vertical direction by spin coating, the spin coating is carried out at low speed by lowering the viscosity of a magnetic paint or vertical orientation is prevented to the utmost by increasing the viscosity. After coating, a vertical magnetic field and a horizontal magnetic field are alternately applied while the coated film is not dried to prevent the cohesion of Ba ferrite particles and to facilitate the movement of particles by dispersion, then a horizontal magnetic field is applied to horizontally orient dispersed particles, the film is dried under such conditions and a magnetic film wherein BA ferrite is horizontally oriented can be formed.

90. 发明专利

JPS61276105A MAGNETIC HEAD 失效
公开(公告)号：JPS61276105A
公开(公告)日：1986-12-06
申请号：JP11801385
申请日：1985-05-31
申请人： FUJITSU LTD
发明人： NARUMI TOSHIKATSU , SUENAGA TADATOSHI , FUKUSHIMA SHIGERU , TAKAHASHI JUN
IPC分类号： G11B5/10 , G11B5/105 , G11B5/187 , G11B5/60
摘要： PURPOSE:To enable the high-density recording on a medium by forming a nonmagnetic thin film on the bottom surface side of a magnetic head to be faced with a magnetic medium thin film. CONSTITUTION:A slider head 6 is formed with a nonmagnetic substance such as 'Fotoceram(R)' having a cylindrical cross section and a sectorial cavity 3 is previously bored through a part of the bottom surface of the head 6. A magnetic core 1 is obtained by sintering and molding the compact of magnetic powder of Mn-Zn ferrite, etc., the molded core 1 is embedded and fixed in the cylindrical 'Fotoceram(R)' to separate the 'Fotoceram(R)' into the upper and the lower part which are symmetrical to the axis B-B. The surface 7 of the assembly of the slider head 6 and the ferrite core 1 to be faced with a disk is coated in about 0.1mum thickness with the sputtered thin film 4 of a nonmagnetic substance such as SiO2.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式