Electronic module with an improved shell and method for making the same

A first shell for coupling with a second shell, the first shell comprising:

• a first base wall;
• a first surrounding wall connected around said first base wall, said first surrounding wall having a first outer surface, a first inner surface opposite to said first outer surface, and a first edge surface connecting between said first outer and inner surfaces;
• a first joint unit disposed on said first edge surface for joining with the second shell, said first joint unit having a first projection portion that projects from said first edge surface and that adjoins said first outer surface, a second projection portion that projects from said first edge surface and that adjoins said first inner surface, and a first indentation portion disposed between said first and second projection portions, said first joint unit further including a plurality of ribs protruding from said first edge surface within said first indentation portion, said plurality of ribs being disposed in spaced-parallel relationship within said first indentation portion, each of said ribs extending fully between said first and second projections portions within said first indentation portion, and each of said ribs being shorter than said first projection portion and said second projection;
• and
• a bump protruding from said second projection portion oppositely of said first edge surface.

A method of producing an electronic module, comprising:

• producing a first shell, the first shell including a first base wall, a first surrounding wall connected around the first base wall, a first joint unit, and a bump, the first surrounding wall having a first outer surface, a first inner surface opposite to the first outer surface, and a first edge surface connecting between the first outer and inner surfaces oppositely of the first base wall, the first joint unit being disposed on the first edge surface, the first joint unit having a first projection portion that projects from the first edge surface and that adjoins the first outer surface, a second projection portion that projects from the first edge surface and that adjoins the first inner surface, and a first indentation portion disposed between the first and second projection portions, the bump protruding from the second projection portion oppositely of the first edge surface;
• producing a second shell, the second shell including a second base wall, a second surrounding wall connected around the second base wall, and a second joint unit, the second surrounding wall having a second outer surface, a second inner surface opposite to the second outer surface, and a second edge surface connecting between the second outer and inner surfaces oppositely of the second base wall, the second joint unit being disposed on the second edge surface, the second joint unit having a first shoulder portion, a third projection portion, and a second shoulder portion;
• and
• joining the first shell with the second shell, which includes joining the first joint unit with the second joint unit by respectively placing the first projection portion, the first indentation portion and the second projection portion in face to face alignment with the first shoulder portion, the third projection portion and the second shoulder portion and by forming a first bonding layer between the first indentation portion and the third projection portion and a second bonding layer between the second projection portion and the second shoulder portion.