Abstract: A composite unit including metal and resin wherein a metal member and a resin member are formed integrally. A seal film made of resin or rubber having high affinity to metal and characterized by flexibility is interposed between contact surfaces of the metal member and the resin member. The seal film is formed of a dispersion having as its main component a copolymer of alkyl methacrylate-alkyl acrylate. The metal member is formed of an Fe group material and the resin member is formed of polyamide resin. The seal film, after being coated on the outer surface of the metal member as a liquid material is embedded in the resin member by insert-molding resin. The metal member is formed to provide a bracket of a starter motor and the resin member to provide a brush holder. A seal member made of rubber is baked onto the contact surfaces between the bracket and the brush holder, and the seal member is embedded in the brush holder made of resin.

Abstract: A revolving electric machine wherein a brush holder formed of resin is solidly secured to a bracket and this bracket is jointed to an opening of a yoke. The bracket is formed into a thin plate shape. A portion of the bracket is clamped from the opposite side by a resin material of the brush holder, whereby the bracket is integrally formed with the brush holder. A faucet joint portion of the brush holder is formed when the brush holder is formed of resin and the faucet joint portion is faucet-jointed to the opening of the yoke, whereby the bracket is center-aligned with the yoke. One of the terminals of a brush penetrates through a resin material of the brush holder and is extracted to the outside. The outer of the terminals of the brush is connected to the outside of the bracket.

Abstract: A magnetic recording apparatus includes a rotary disc rotatable about an axis and having an outwardly extending radial flange with three apertures therein; three pins mounted in the apertures on the rotary disc and positioned about a circle concentric with the axis for accurately supporting an information record disc thereon, each of the three pins projecting from the rotary disc to substantially the same height; and a magnet positioned on the flange of the rotary disc and having a height lower than the three pins for magnetically attracting the information record disc to secure the latter on the three pins.