Patent ID: 6698852
Filing Date: 2004-03-02
Classification: B22D,Y10S

Abstract:
A metal box for electronic equipment to be obtained by injecting at a predetermined velocity a molten metal formed of a low melting point metal material heated to a predetermined temperature into an injection molding cavity of a predetermined shape provided in a metal mold heated to the predetermined temperature and taking out a molded component from said injection molding cavity after cooling off and solidifying the injected molten metal, comprising:a trapezoidal concave design forming unit formed with a predetermined depth on a surface and having oblique sides with an inclination angle of a predetermined angle with respect to a virtual side normal to said surface from said surface towards a bottom surface, wherein said inclination angle of each said oblique side is formed approximately 3 to 5 degrees with respect to a virtual side normal to said surface of said box, a depth of said concave design forming unit is formed at least approximately 25 percent to 40 percent of a depth of said box and a connecting part of said surface and said oblique sides of said box and a connecting part of said oblique sides and said bottom surface are formed in circular arcs having radii of approximately 8 percent to 17 percent of the depth of said box.