| 摘要 |
The present invention is useful for achieving a reduction in weight and for attaining increased strength in not only electronic devices and domestic electric devices but also various parts and structures. As a pretreatment, a rib ( 3 ) is dipped in an aqueous solution of ammonia, hydrazine, a hydrazine derivative, or a water-soluble amine compound. A metal frame ( 2 ) is inserted into an injection mold for forming ribs ( 3 ) by injection molding. A thermoplastic resin composition is injected to the surface of the metal frame ( 2 ) by injection molding to form ribs ( 3 ). In the housing of a casing cover ( 1 ) thus formed, the metal frame ( 2 ) and the ribs ( 3 ) made of the thermoplastic resin composition are integrally bonded together. Thus, the housing improves strength and external appearance. Moreover, a complicated configuration and structure can be formed in the housing.
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