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    • 7. 发明授权
    • Magnetic recording medium and a process for producing the same
    • 磁记录介质及其制造方法
    • US6127039A
    • 2000-10-03
    • US235382
    • 1999-01-22
    • Akira SaitohAkihiko SekiTakayoshi KuwajimaSatoru Tsuchida
    • Akira SaitohAkihiko SekiTakayoshi KuwajimaSatoru Tsuchida
    • G11B5/702G11B5/73G11B5/735G11B5/738G11B5/84G11B5/842
    • G11B5/735G11B5/8404Y10S428/90Y10T428/31609Y10T428/31935
    • A magnetic recording medium comprising a non-magnetic base having on at least one side a non-magnetic layer (undercoat) containing electron beam-curable resins which in turn is over-laid with a magnetic layer (topcoat) containing an iron (Fe) based magnetic powder, said magnetic layer having a glass transition temperature (Tg) of at least 65.degree. C. and said non-magnetic layer being an electron beam cured coating that is formed by coating the non-magnetic base with a non-magnetic coating mix containing electron beam curable resins, the yet to be cured coating having a glass transition temperature (Tg) of 30-53.degree. C. and said electron beam curable resins comprising an electron beam curable vinyl chloride based resin having a sulfur-containing polar group and an electron beam curable urethane resin having a phosphorus-containing polar group. Also disclosed is a process for producing the magnetic recording medium, which has good electromagnetic conversion characteristics in a high-frequency range and which can be manufactured at high production rate.
    • 一种磁记录介质,包括在至少一个侧面上具有含有电子束固化树脂的非磁性层(底涂层)的非磁性基底,该非磁性层又包含含有铁(Fe)的磁性层(面漆) 所述磁性层的玻璃化转变温度(Tg)至少为65℃,所述非磁性层是通过用非磁性涂层涂覆非磁性基底形成的电子束固化涂层 含有电子束固化树脂的混合物,尚待固化的涂层的玻璃化转变温度(Tg)为30-53℃,所述电子束固化树脂包含具有含硫极性基团的电子束固化氯乙烯基树脂 和具有含磷极性基团的电子束固化性聚氨酯树脂。 还公开了一种制造磁记录介质的方法,其在高频范围内具有良好的电磁转换特性,并且可以以高生产率制造。
    • 8. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US5712028A
    • 1998-01-27
    • US618260
    • 1996-03-18
    • Akihiko SekiAkira SaitohSatoru Tsuchida
    • Akihiko SekiAkira SaitohSatoru Tsuchida
    • C09D5/23G11B5/708G11B5/73G11B5/738G11B5/70
    • G11B5/738G11B5/7085Y10S428/90Y10T428/24975Y10T428/25Y10T428/265
    • A magnetic recording medium includes a flexible substrate, an undercoating layer formed on the substrate, and a magnetic layer formed on the undercoating layer. The undercoating layer contains a binder and nonmagnetic particles having an average particle size in the range of 0.01 to 0.20 .mu.m. The content of the nonmagnetic particles in the undercoating layer is in the range of 40 to 85% by weight. The magnetic layer contains ferromagnetic powder, a binder and an abrasive having an average particle size in the range of 0.10 to 0.40 .mu.m. The magnetic layer has a thickness in the range of 0.10 to 0.30 .mu.m and contains the abrasive in the range of 1 to 5 parts by weight relative to 100 parts by weight of the ferromagnetic powder. With this arrangement, the magnetic recording medium is capable of high density recording and excellent in electromagnetic transducer property and durability.
    • 磁记录介质包括柔性基板,形成在基板上的底涂层和形成在底涂层上的磁性层。 底涂层含有平均粒度为0.01〜0.20μm的粘合剂和非磁性粒子。 底涂层中的非磁性颗粒的含量在40至85重量%的范围内。 磁性层包含铁磁粉末,粘合剂和平均粒度在0.10至0.40μm范围内的磨料。 磁性层的厚度在0.10〜0.30μm的范围内,相对于100重量份的铁磁性粉末,磨料的含量为1〜5重量份。 利用这种布置,磁记录介质能够进行高密度记录,并且具有优异的电磁换能器性能和耐久性。
    • 9. 发明授权
    • Pressure casting method through pressurizing pin advancement speed
control
    • 压铸法通过加压销提升速度控制
    • US5671797A
    • 1997-09-30
    • US516363
    • 1995-08-17
    • Mikiya NozakiMitsuhiro KarakiMitsuru InuiTakehito FutamuraAkira Saitoh
    • Mikiya NozakiMitsuhiro KarakiMitsuru InuiTakehito FutamuraAkira Saitoh
    • B22D18/02B22D17/20B22D17/22B22D17/32B22D27/11B29C45/56B29C45/76B29C45/82B22D47/00
    • B22D27/11B22D17/2069B22D17/32B29C45/561B29C2043/5808B29C45/82
    • A pressure casting method is disclosed, which permits sufficient pressurizing effect to be obtained for the entire molten metal by varying the speed of advancement of a pressurizing pin according to the state of solidification of the molten metal during pressurizing. In pressure casting using a pressure casting apparatus, while charged molten metal is solidified, it is pressurized by causing advancement of the pressurizing pin into a cavity of the die. During this time, the reaction force received by the pressurizing pin from the molten metal is measured by a pressure sensor, and the speed of advancement of the pressurizing pin is varied through control of the opening degree of a flow control valve according to the measured reaction force. While the reaction force during the progress of solidification of molten metal is high, the flow control valve is controlled to a high opening degree to provide for a high speed of advancement of the pressurizing pin so as to apply a high pressurizing force. On the other hand, while the reaction force is low so that there is a delay in the solidification of molten metal, the speed of advancement is reduced so that no pressurizing force is applied until completion of solidification of molten metal. The pressurizing pin is advanced while its advancement speed is controlled in the above way, and pressurizing over the entire stroke is completed.
    • 公开了一种压铸法,其通过根据加压期间的熔融金属的凝固状态改变加压销的前进速度,从而对整个熔融金属获得足够的加压效果。 在使用压力铸造装置的压力铸造中,当充入的熔融金属固化时,通过使加压销进入模具的空腔而被加压。 在此期间,通过压力传感器测量加压销从熔融金属接收的反作用力,并且通过根据所测量的反应来控制流量控制阀的开度来改变加压销的前进速度 力。 当熔融金属凝固进行期间的反作用力高时,流量控制阀被控制到高开度,以提供加压销的高速推进以施加高的加压力。 另一方面,当反作用力低时,熔融金属的凝固延迟,提前速度降低,直到熔融金属凝固完成之前不施加加压力。 加压销前进,其进给速度以上述方式控制,并且整个行程的加压完成。
    • 10. 发明授权
    • Method for production of magnetic recording medium
    • 磁记录介质的制造方法
    • US5576075A
    • 1996-11-19
    • US551341
    • 1995-11-01
    • Kaoru KawasakiAkira SaitohAkihiko SekiKazuyuki ShimazakiTakahiro MoriHisato Kato
    • Kaoru KawasakiAkira SaitohAkihiko SekiKazuyuki ShimazakiTakahiro MoriHisato Kato
    • B05D5/12G11B5/842G11B5/848B05D3/00
    • G11B5/842G11B5/848
    • This invention concerns a method for producing a magnetic recording medium by passing a magnetic coating material comprising a ferromagnetic powder and a binder resin through an ultrasonic treating device under the operating conditions of 10 to 200 kHz of frequency of oscillation and 10 to 100 .mu.m of amplitude of ultrasonic wave thereby effecting ultrasonic treatment of the magnetic coating material and coating the treated magnetic coating material on a substrate either directly or through an undercoating layer, characterized in that the ultrasonic treating device comprises an ultrasonic treating tank adapted to effect ultrasonic wave treatment of the magnetic coating material by passing the material therethrough, an ultrasonic wave horn inserted into the ultrasonic treating tank and provided with an operating end surface capable of exerting an ultrasonic oscillation on the magnetic coating material, and an ultrasonic wave oscillator connected to a basal part side of the ultrasonic wave horn, an operating depth H defined by the distance from the operating end surface of the ultrasonic wave horn to a bottom wall surface of the ultrasonic treating tank opposed to the operating end surface is set at a magnitude in the range of 2 to 40 mm, and the magnetic coating material to be coated on the substrate is subjected to tile ultrasonic treatment.
    • 本发明涉及一种磁记录介质的制造方法,其特征在于,在振荡频率为10〜200kHz,振动频率为10〜100μm的运行条件下,通过超声波处理装置使包含铁磁性粉末和粘结剂树脂的磁性涂层材料通过 超声波的振幅,从而对磁性涂层材料进行超声波处理,并将处理过的磁性涂层材料直接或通过底涂层涂覆在基底上,其特征在于,超声波处理装置包括适用于超声波处理的超声波处理槽 所述磁性涂层材料通过所述材料通过,超声波喇叭插入所述超声波处理槽中并且具有能够在所述磁性涂层材料上施加超声波振荡的操作端面,以及连接到所述基底部侧的超声波振荡器 的超声波 通过从超声波喇叭的操作端面到操作端面的超声波处理槽的底壁面的距离限定的操作深度H被设定在2〜40mm的范围内 并且将要涂覆在基底上的磁性涂层材料进行瓦片超声波处理。