| 摘要 |
PURPOSE:To stabilize the characteristics of a stem by plating Ni on the surface of a flange made of iron series metal formed with an engaging hole for a heat sink and engaging fixedly a copper heat sink having no plating film, thereby preventing the decrease of the heat sink property of the stem. CONSTITUTION:A flange 2 of approximately rhombic shape made of iron series metal formed with mounting holes for a heat sink 4 and a lead 6 and coated with an Ni-plating layer 1 is used for the stem of a can sealing apparatus. The copper heat sink 4 is engaged with the hole plated with Ni on the inner surface and is caulked. Then, the lead 6 is inserted through glass bead into the mounting hole, is the heat treated, and is molten and secured to a glass layer 5. At this time the heat sink 4 is mutually diffused at the engaged part of the layer 1, and is rigidly hermetically joined. since the plating layer is not formed on the surface to be mounted with the heat sink 4, no void is produced in the pellet mounting part, thereby preventing the unstable decrease in the heat radiation and the characteristics. |
