| 摘要 |
PURPOSE:To prevent the outflow of resin on a lead frame by a method wherein a pressure-equalizing block, in which a plurality of elastic bodies are built in, is provided between the platen and the metal molds of a pressing device. CONSTITUTION:A plurality of elastic bodies 11, 11... such as springs, which can resist the clamping pressure of pressing molds, are provided between the upper platen 9 and the top force 7 of a pressing device. Said elastic bodies 11 are supported by a pressure-equalizing block 12. As a result, even when the platen 9 of the pressing device is bent, uniform press mold clamping pressure acts on the chase block 1, because the pressure-equalizing block 12 equipped with the built-in elastic bodies 11 is provided between the chase blocks 1, and a uniform plane surface can be maintained without generating a gap on the parting surface 10 located between the top force 7 and the bottom force 6. Consequently, the outflow of resin can be prevented, and the removing work of the flowed out resin to be performed after a sealing process can be unnecessitated; besides, the highly precise resin sealing device producing no distortion of metal molds can be obtained. |
