| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a cap which has a projection for resistance welding and is resistance-welded to a stem to become a can package, and in which a fused part is prevented from scattering or spreading into an element mounting space of the can package during the resistance welding at inexpensively. <P>SOLUTION: The cap 4 has the cylindrical body portion B of a cap shell 4b which has a condenser lens 4a and where the condenser lens 4a is fixed, and the flange portion F of the cap shell 4b provided to the end of the body portion B on the opposite side from the condenser lens 4a and welded to the stem. The flange portion F has the annular projection F1 for resistance welding to the stem, and an annular groove F2, recessed to the opposite side to the projection direction of the projection F1, on the inner peripheral side of the projection F1, the projection F1 and annular groove F2 being formed concentrically by pressing. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
