公开(公告)号：US5547704A

公开(公告)日：1996-08-20

申请号：US300542

申请日：1994-09-06

申请人： Yasuo Nagashima ,  Ryuji Shirahata

发明人： Yasuo Nagashima ,  Ryuji Shirahata

IPC分类号： G11B5/716 ,  C09D5/23 ,  C09D7/12 ,  G11B5/73 ,  G11B5/82 ,  G11B5/842 ,  B05D5/12

CPC分类号： G11B5/716 ,  G11B5/825

摘要： A flexible magnetic disk has a first magnetic layer formed on a first surface of a circular polymeric substrate by coating and drying a magnetic coating material. After the first magnetic layer is formed and dried, a second magnetic layer is formed on a second surface of the polymeric substrate by coating and drying the magnetic coating material. The second magnetic layer formed on the second surface is then calendered to form a magnetic recording surface. The resulting magnetic disk provides for an improved surface vibration during high-speed rotation of the disk, and provides very good head touch.

摘要翻译： 柔性磁盘具有通过涂覆和干燥磁性涂层材料形成在圆形聚合物基底的第一表面上的第一磁性层。 在第一磁性层形成和干燥之后，通过涂覆和干燥磁性涂层材料，在聚合物基底的第二表面上形成第二磁性层。 然后形成在第二表面上的第二磁性层被压延以形成磁记录表面。 所得到的磁盘提供了在盘的高速旋转期间改进的表面振动，并且提供非常好的头部触感。

公开(公告)号：US5093172A

公开(公告)日：1992-03-03

申请号：US543911

申请日：1990-06-26

申请人： Mikihiko Kato ,  Yasushi Endo ,  Yasuo Nagashima ,  Hiroshi Hashimoto

发明人： Mikihiko Kato ,  Yasushi Endo ,  Yasuo Nagashima ,  Hiroshi Hashimoto

IPC分类号： G11B5/702

CPC分类号： G11B5/7022 ,  Y10S428/90 ,  Y10T428/3158 ,  Y10T428/31609

摘要： A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon a magnetic layer comprising ferromagnetic metal particles and binder resins, in which 35 to 55% by weight of said binder resins are a polar group-containing vinyl chloride copolymer and 10 to 25% by weight of said binder resins are a polyurethane resin obtained by the reaction of a polyisocyanate with a polyester polyol that is a product of the reaction of at least one of an alicyclic dihydric alcohol and an aromatic dihydric alcohol with at least one of an alicyclic dicarboxylic acid and an aromatic dicarboxylic acid, said polyurethane resin containing a polar group selected from the group consisting of --SO.sub.3 M, --COOM, --PO.sub.3 M wherein M is an H, Na, or K atom, and --NH.sub.2 in an amount of from 0.03 to 2% by weight, the amount of said binder resin in the magnetic layer being from 15 to 30 parts by weight per 100 parts by weight of said ferromagnetic metal particles.

摘要翻译： 公开了一种磁记录介质，包括其上具有包含铁磁性金属颗粒和粘合剂树脂的磁性层的非磁性载体，其中35至55重量％的所述粘合剂树脂是含极性基团的氯乙烯共聚物和10至25重量％ 所述粘合剂树脂是通过多异氰酸酯与作为脂环族二元醇和芳族二元醇中的至少一种与芳族二元醇的反应的产物的聚酯多元醇与脂环族二羧酸中的至少一种反应得到的聚氨酯树脂 酸和芳族二羧酸，所述聚氨酯树脂含有选自-SO 3 M，-COOM，-PO 3 M的极性基团，其中M为H，Na或K原子，-NH 2的量为0.03〜 2重量％，磁性层中所述粘合剂树脂的量为每100重量份所述铁磁性金属颗粒15至30重量份。

公开(公告)号：US5191497A

公开(公告)日：1993-03-02

申请号：US935355

申请日：1992-08-28

申请人： Hitoshi Saito ,  Yasuo Nagashima ,  Toshihiko Matsuo ,  Takashi Matsumoto

发明人： Hitoshi Saito ,  Yasuo Nagashima ,  Toshihiko Matsuo ,  Takashi Matsumoto

IPC分类号： G11B17/32

CPC分类号： G11B17/32

摘要： In a magnetic disk pack comprising a protective casing rotatably accommodating a flexible magnetic disk thereinside and having a pair of aligned windows formed at corresponding positions respectively so that a magnetic head can be inserted into one of the windows to be brought into sliding contact with the magnetic disk under rotation thereby recording and reproducing picture information on and from the magnetic disk, an inclined surface making an angle with the free rotation plane of the magnetic disk is provided on an inner part of the marginal edge of at least one of the windows or on a member resiliently supported at that position thereby inducing a positive pressure or a negative pressure between the rotating magnetic disk and the inclined surface depending on the direction of rotation of the magnetic disk. Such a positive pressure or negative pressure is utilized to urge or attract the magnetic disk toward and onto the magnetic head so as to ensure satisfactory head touch. In a mangetic disk recording/reproducing apparatus in which magnetic heads are inserted into such a magnetic disk pack, and a magnetic disk is rotated in one direction and the other by a reversible spindle motor, an inclined surface making an angle with the free rotation plane of the magnetic disk is provided on each of control members inserted into the windows of the magnetic disk pack together with the magnetic heads so as to similarly ensure satisfactory head touch.

摘要翻译： 在一个磁盘组件中，包括一个可旋转地容纳其内部的柔性磁盘的保护壳体，并具有分别形成在相应位置上的一对对准的窗口，使得一个磁头可以被插入一个窗口以与磁体 盘旋转，从而在磁盘上记录和再现图像信息，与至少一个窗口的边缘的内部部分上设置与磁盘的自由旋转平面成一定角度的倾斜表面，或者在 弹性地支撑在该位置处的构件，由此根据磁盘的旋转方向在旋转磁盘和倾斜表面之间引起正压或负压。 利用这种正压或负压将磁盘推向或吸引到磁头上，以确保令人满意的头部接触。 在其中磁头被插入这样的磁盘盒中并且磁盘通过可逆主轴电动机在一个方向上彼此旋转并且与自由旋转平面成一定角度的倾斜表面的一个装配盘记录/再现装置中 的磁盘被设置在与磁头一起插入到磁盘盒的窗口中的每个控制构件上，以类似地确保令人满意的头部接触。

公开(公告)号：US5178925A

公开(公告)日：1993-01-12

申请号：US609844

申请日：1990-11-07

申请人： Yasushi Endo ,  Mikihiko Kato ,  Yasuo Nagashima ,  Toshio Kawamata

发明人： Yasushi Endo ,  Mikihiko Kato ,  Yasuo Nagashima ,  Toshio Kawamata

IPC分类号： C09D5/23 ,  C09D7/12 ,  G11B5/702 ,  G11B5/706 ,  G11B5/712 ,  G11B5/714

CPC分类号： G11B5/706 ,  G11B5/7022 ,  G11B5/712 ,  Y10S428/90 ,  Y10T428/265 ,  Y10T428/2991 ,  Y10T428/3158 ,  Y10T428/31591 ,  Y10T428/31609 ,  Y10T428/31935

摘要： A magnetic disc having excellent running durability is disclosed, which comprises a non-magnetic support and a magnetic layer on the non-magnetic support, the layer being composed mainly of a ferromagnetic metal powder and a binder resin, wherein the ferromagnetic metal powder has a pH value of less than 7.0 and a specific surface area as determined by the BET method of at least 40 m.sup.2 /g, and the glass transition temperature of the magnetic layer is at least 75.degree. C.

摘要翻译： 公开了一种具有优异的运行耐久性的磁盘，其包括非磁性支撑件和非磁性支撑件上的磁性层，该层主要由铁磁金属粉末和粘合剂树脂组成，其中铁磁性金属粉末具有 pH值小于7.0，BET法测定的比表面积为40m 2 / g以上，磁性层的玻璃化转变温度为75℃以上。

公开(公告)号：US5091238A

公开(公告)日：1992-02-25

申请号：US534912

申请日：1990-06-08

申请人： Mikihiko Kato ,  Hiroshi Hashimoto ,  Yasushi Endo ,  Yasuo Nagashima

发明人： Mikihiko Kato ,  Hiroshi Hashimoto ,  Yasushi Endo ,  Yasuo Nagashima

IPC分类号： C09D5/23 ,  C09D101/08 ,  C09D175/06 ,  G11B5/702 ,  G11B5/706

CPC分类号： G11B5/7025 ,  Y10S428/90 ,  Y10T428/2982 ,  Y10T428/31591 ,  Y10T428/3179

摘要： A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon a magnetic layer comprising mainly ferromagnetic metal particles of a specific surface area and binder resins, wherein at least part of said binder resins is a cellulosic resin having in side chains of the molecules thereof a polar group which is a sulfonic acid group, a metal sulfonate group, a phosphoric acid group, or a metal phosphate group.

摘要翻译： 公开了一种磁记录介质，其包括其上具有主要包含比表面积的铁磁金属颗粒和粘合剂树脂的磁性层的非磁性载体，其中至少部分所述粘合剂树脂是具有分子侧链的纤维素树脂 作为磺酸基的极性基团，金属磺酸盐基，磷酸基或金属磷酸酯基。

公开(公告)号：US4945436A

公开(公告)日：1990-07-31

申请号：US222667

申请日：1988-07-21

申请人： Yasuo Nagashima

发明人： Yasuo Nagashima

IPC分类号： G11B17/32

CPC分类号： G11B17/32

摘要： A double-sided recording method comprising disposing first and second magnetic heads opposed to each other on opposite sides of a rotating flexible magnetic disk, and placing guide plates at the upstream or downstream side of the first or second magnetic head. The guide plates are slanted to apply negative or positive pressure to the flexible magnetic disk and to cause the flexible magnetic disk to be attracted or urged to the first or second magnetic head, thereby ensuring close contact of the flexible magnetic disk with the first or second magnetic head.

摘要翻译： 一种双面记录方法，包括在旋转的柔性磁盘的相对侧上布置彼此相对的第一和第二磁头，以及将引导板放置在第一或第二磁头的上游侧或下游侧。 引导板倾斜以对柔性磁盘施加负压或正压，并使柔性磁盘被吸引或推动到第一或第二磁头，从而确保柔性磁盘与第一或第二磁头的紧密接触 磁头。

公开(公告)号：US5045372A

公开(公告)日：1991-09-03

申请号：US466809

申请日：1990-01-18

申请人： Yasushi Endo ,  Mikihiko Kato ,  Yasuo Nagashima ,  Yasuyuki Yamada

发明人： Yasushi Endo ,  Mikihiko Kato ,  Yasuo Nagashima ,  Yasuyuki Yamada

IPC分类号： G11B5/71 ,  G11B5/714

CPC分类号： G11B5/71 ,  G11B5/714 ,  Y10S428/90 ,  Y10T428/2982

摘要： A magnetic recording medium having on a non-magnetic support a magnetic layer mainly composed of a ferromagnetic metal powder and a binder resin is disclosed, wherein the specific surface area S (m.sup.2 /g) of the ferromagnetic metal powder is from 30 to 65 and the magnetic layer further contains a fatty acid ester in a content Y (% by weight) to the ferromagnetic metal powder of the range of 0.05S+5.5.ltoreq.Y.ltoreq.-0.2S+24 when the specific surface area S is from 30 to less than 50 and the range of 0.06S+4.7.ltoreq.Y.ltoreq.-0.13S+21 when the specific surface area S is from 50 to 65. The magnetic recording medium is suitable for high density recording and exhibits excellent running durability.

摘要翻译： 公开了一种磁性记录介质，其特征在于，磁性金属粉末的比表面积S（m 2 / g）为30〜65，非磁性载体为主要由强磁性金属粉末和粘结剂树脂构成的磁性层， 磁性层还含有当比表面积S为0.05S +5.5≤X≤0.2S+ 24范围的铁磁性金属粉末的含量Y（重量％）的脂肪酸酯 当比表面积S为50至65时，从30至小于50，且0.06S + 4.7

公开(公告)号：US4984121A

公开(公告)日：1991-01-08

申请号：US302296

申请日：1989-01-27

申请人： Yasuo Nagashima

发明人： Yasuo Nagashima

IPC分类号： G11B17/32

CPC分类号： G11B17/32

摘要： A magnetic recording/reproduction apparatus using a magnetic head in sliding contact with a flexible magnetic disk for recording and reproduction, which has a negative pressure generating member disposed at the upstream side of the magnetic head and at the same side of the magnetic head with respect to the flexible magnetic disk, having an inclined surface inclined to be farther from the flexible magnetic disk towards the downstream side, and a positive pressure generating member disposed at the downstream side of the magnetic head and at the opposite side of the magnetic head with respect to the flexible magnetic disk, having an inclined surface inclined to be closer to the flexible magnetic disk towards the downstream side, the rotating flexible magnetic disk being attracted by the negative pressure and urged by the possible pressure to achieve stable sliding contact with the magnetic head.

摘要翻译： 一种磁记录/再现装置，其使用与用于记录和再现的柔性磁盘滑动接触的磁头，该磁性记录/再现装置具有设置在磁头的上游侧和与磁头相同侧的负压产生件， 具有从柔性磁盘向下游侧倾斜的倾斜表面的柔性磁盘以及设置在磁头的下游侧和磁头的相反侧的正压产生件，相对于 对于柔性磁盘，具有朝向下游侧更靠近柔性磁盘的倾斜表面，旋转的柔性磁盘被负压吸引并被可能的压力推压以实现与磁头的稳定的滑动接触 。

公开(公告)号：US5051287A

公开(公告)日：1991-09-24

申请号：US424445

申请日：1989-10-20

申请人： Yasuyuki Yamada ,  Mikihiko Kato ,  Yasuhi Endo ,  Masaya Kojima ,  Yasuo Nagashima

发明人： Yasuyuki Yamada ,  Mikihiko Kato ,  Yasuhi Endo ,  Masaya Kojima ,  Yasuo Nagashima

IPC分类号： C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/06 ,  G11B5/706 ,  G11B5/714 ,  G11B5/82

CPC分类号： G11B5/714 ,  G11B5/70605 ,  Y10S428/90 ,  Y10T428/31609

摘要： A magnetic disk comprising a nonmagnetic support having provided thereon a magnetic layer comprising a ferromagnetic metal powder and a binder resin, wherein the magnetic layer has a mechanical loss tangent, tan .delta., of from 8.times.10.sup.-3 to 6.times.10.sup.-2, measured at a frequency of 110 Hz and in a temperature range of from 20.degree. to 50.degree. C. with a temperature increase rate of 2 deg/min.

摘要翻译： 一种磁盘，其包括非磁性载体，其上设置有包含铁磁性金属粉末和粘合剂树脂的磁性层，其中磁性层具有8×10 -3至6×10 -2的机械损耗角正切，tanδ，频率 为110Hz，温度范围为20〜50℃，升温速度为2℃/分钟。

公开(公告)号：US5018257A

公开(公告)日：1991-05-28

申请号：US505087

申请日：1990-04-05

申请人： Yasuo Nagashima ,  Haruo Soeda ,  Masamichi Sato ,  Takashi Kubo

发明人： Yasuo Nagashima ,  Haruo Soeda ,  Masamichi Sato ,  Takashi Kubo

IPC分类号： B24B1/00 ,  B24B31/112

CPC分类号： B24B31/112 ,  B24B1/005 ,  Y10T29/47 ,  Y10T407/10 ,  Y10T82/11

摘要： A magnetic sheet polishing device including a scraper having a sliding surface and a downstream side surface that is nearly perpendicular or at an acute angle to the sliding surface to ensure that magnetic material powder spontaneously falls away from and does not adhere again to the magnetic material surface of the magnetic sheet after being scraped off by the scraper. Additionally, the scraper has a diagonal groove or a diagonal step formed in a side surface to check for wear of the sliding surface.