Patent ID: 8231982

Claim:
A composite of a metal and a resin, composed of a pretreated shaped metal and a shaped thermoplastic resin integrally joined to one face of the shaped metal by injection molding, wherein the shaped thermoplastic resin comprises a seat ( 42 , 62 ) and an upright molding ( 41 , 61 ) protruding from this seat ( 42 , 62 ), a runner ( 43 , 63 ) is provided which communicates with the seat ( 42 , 62 ) via two or more sprues ( 47 , 67 ) and through which a molten thermoplastic resin injected through an injection gate ( 45 , 65 ) flows into the upright molding ( 41 , 61 ), the thermoplastic resin injected through the injection gate ( 45 , 65 ) flows into and fills locations of the upright molding ( 41 , 61 ), opposite to each other with respect to a straight line (X-X) passing through the center of the upright molding ( 41 , 61 ), so that the flow amount per unit of time is substantially uniform, the runner ( 43 , 63 ) is split into two ways by a splitter ( 46 , 66 ), the seat ( 42 , 62 ), the runner ( 43 , 63 ), the sprues ( 47 , 67 ) and the upright molding ( 41 , 61 ) are formed to have a shape in plan view that is symmetrical with respect to a first straight line (Y-Y) passing through the injection gate ( 45 , 65 ) and the center of the upright molding ( 41 , 61 ) the thermoplastic resin is guided preferentially to the upright molding ( 41 , 61 ) on the farther side away from the injection gate ( 45 , 65 ) in the direction of a second straight line (X-X) passing through the center of the upright molding ( 41 , 61 ) and perpendicular to the first straight line (Y-Y), utilizing the direction of flow of the thermoplastic resin coming out of the sprues ( 47 , 67 ), and the thermoplastic resin flows into and fills locations of the upright molding ( 41 , 61 ), opposite to each other with respect to the first straight line (Y-Y) and the second straight line (X-X), so that the flow amount per unit of time is substantially uniform.