Metal fusion bonding – Process – Plural joints
Patent
1995-05-17
1996-06-11
Ramsey, Kenneth J.
Metal fusion bonding
Process
Plural joints
2282341, 228 42, B23K 1012
Patent
active
055248128
ABSTRACT:
The present invention provides a reflow apparatus and method effective to make constant the internal gas flow direction in a heating section within a reflow furnace. A circulating gas path is formed in a heating unit which collects and causes the gas to flow from a sirocco fan, up the rear side of the heating unit and then down towards a circuit board moving along a transfer path at the front side of the heating unit. Moreover, a plurality of straightening plates are arranged above the transfer path of the heating unit so as to guide the hot gas, which is flowing forwardly downwardly toward the circuit board moving along the transfer path. A blow-down nozzle is provided and includes a plurality of plates aligned in rows in the transferring direction of the circuit boards. The plates have an inverse U-shaped cross section. The blow-down nozzle is arranged below the straightening plates to cause the vertical hot gas flows to flow uniformly over the whole surface of the circuit board.
REFERENCES:
patent: 4909430 (1990-03-01), Yokota
patent: 5069380 (1991-12-01), Deambrosio
patent: 5141147 (1992-08-01), Yokota
patent: 5145100 (1992-09-01), Kondo
patent: 5147083 (1992-09-01), Halstead et al.
patent: 5356066 (1994-10-01), Yamada
Ando Manabu
Hamasaki Kurayasu
Ishimoto Kazumi
Kuwabara Kimihito
Mimura Toshinori
Matsushita Electric - Industrial Co., Ltd.
Ramsey Kenneth J.
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