Hitachi, Ltd.

Osamu Miyo

Shigeo Amagi

Katsuhide Oohashi

Sadayuki Aoki

Katsuhide Ohashi

A pre-molded part is formed by pre-molding an insert with a pre-molded member, and then the pre-molded part is inserted into an over-molded member composed of thermo plastic resin. After applying a heat treatment with a temperature lower than a crystalline melting point of the pre-molded part to the pre-molded part surrounding the insert, a firm contact between the insert and the resin surrounding the insert without a gap at the interface between those parts is obtained.

Structure of parts made from plural composite pieces and method of building those parts

Continuous annular resin bands surrounding electrical contact portions of respective terminals are disposed without gaps between the electrical contact portions of respective terminals and resin members that fixedly hold the terminals; there are formed gaps among the adjoining resin bands. Gaps are formed among a bundle of terminals having annular resin bands and resin members surrounding the bundle. A partial adhesion is formed at the interface between the terminals and the resin by a low cost manufacturing method, whereby a molding with high air-tightness between the interior and exterior thereof and high reliability is realized.

Composite moldings and a method of manufacturing the same

An integrally multiple-molded part for electronic devices is provided capable of absorbing and relieving the internal stresses of a multiple-molded part, preventing the occurrence of clearances between the bonding side face of each electrical connection terminal and a resin, obtaining stable frictional force at the contact region between the bonding surface of the electrical connection terminal and an aluminum wire, obtaining the energy required for bonding, and achieving high bondability. The surface of the molded electrical connection terminal section formed as a primary-molded article becomes exposed after secondary molding, and a stress-absorbing structure is formed in the primary molding resin section of the primary-molded article that serves as a transmission path for stresses associated with the resin shrinkage occurring when the secondary molding resin is cured.

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Hitachi, Japan

Osamu Miyo