Kabushiki Kaisha Sankyo Seiki Seisakusho

Nippon Steel Corporation

Sankyo Seiki Mfg. Co., Ltd

Takafumi Kuwazawa

Toshihiro Kobayashi

Shigeru Nishida

Yuki Nakamura

Tetsuo Hoshina

Toshimasa Kobayashi

Kingo Chino

Toshiro Shimodaira

A motor having rotor has a good balance of inertia and a magnetic characteristic that match the specifications of the motor with which those rotors are to be used. A rare-earth containing iron-base resin-bonded magnet is molded from an iron-base magnetic powder containing a rare earth metal such as neodymium and praseodymium in powder, a thermoplastic or thermosetting resin and additive. A density and magnetic characteristic is proportionally changed by adjusting a mixing ratio of a filler powder. Specifically, when a mixing ratio of filler powder containing tungsten having a density 19.1 g/cm.sup.3 is in 13 vol % is injected, or a mixing ratio of alloy powder containing tungsten an nickel, or tungsten and chromium having a density 10.5 g/cm.sup.3 is compression-mold, its magnetic flux assume the same value as those of compression-molded Sm--Co magnets.

Rare-earth containing iron-base resin bonded magnets

A method of manufacturing a resin bound magnet comprising, mixing and kneading a powdered magnetic material and a rubber modified epoxy resin obtained from the addition polymerization of an epoxy resin and a butadiene or nitrile rubber and thereafter molding and setting the kneading mixture into a desired shape. The magnets prepared by the present invention exhibit permanent deformation under low compressive force, are soft and heat resistant and yet highly elastic and possess low dynamic exothermic properties and excellent low temperature characteristics. In addition, the inventive magnets exhibit excellent radial compression strength and other mechanical properties.

Method of manufacturing a resin bound magnet

Corrosionproof coating material and method for formation of coating

A recording head for electrostatic recording comprises an electrode substrate formed by bonding together by a bonding agent a pair of substantially planar sub-substrates of an electrical insulating material, each of which is formed on its one surface with a plurality of elongate, equally-spaced and parallel recording electrodes electrically insulated from each other and aligned in a row, so that the electrodes on one of the sub-substrates are located, respectively, opposite to the spaces between adjacent electrodes on the other sub-substrate. In the recording head, the electrode row on each of the sub-substrates has a high degree of linearity, and the dimension in the widthwise direction of the electrode substrate defined by the distance between the electrode row on one of the sub-substrates and that on the other sub-substrate is maintained uniform over the whole longitudinal direction of the electrode substrate. A method of making such a recording head is also disclosed.

Electrostatic recording head and method of making the same

Growing community of inventors

Nagano, Japan

Takafumi Kuwazawa