公开(公告)号：US5229575A

公开(公告)日：1993-07-20

申请号：US722648

申请日：1991-06-28

申请人： Debra L. Waller ,  Louis E. Colella ,  Ronald Pacheco

发明人： Debra L. Waller ,  Louis E. Colella ,  Ronald Pacheco

IPC分类号： B23K3/03

CPC分类号： B23K3/0315 ,  B23K3/033

摘要： A thermode having a relatively long and thick blade composed of a high thermal conductivity, low thermal expansion material, e.g., molybdenum, provides an elongated contact surface for bonding a row of leads of an electronic component to a circuit board. A thermode holder is coupled to the blade by means of a plurality of struts, including a pair of outer struts, each connected at one end of the respective ends of the blade and at an acute angle facing the other outer strut, and a pair of shorter inner struts, each connected with the blade intermediate the ends of the blade and at an acute angle facing the outer strut adjacent thereof, such that in response to a force urging the blade against the circuit board, the outer struts cause a negative deflection of the blade with respect to the board and the inner struts decrease the magnitude of the deflection. The blade is heated by electric current supplied thereto from a transformer through the inner and outer struts. A step in the contact surface of the blade provides an acceptally narrow bonding footprint while allowing use of a desirably thermally massive thick blade.

摘要翻译： 具有由高导热性，低热膨胀材料（例如钼）组成的较长而厚的刀片的热电偶提供用于将电子部件的一排引线接合到电路板的细长接触表面。 热源保持器借助于多个支柱而联接到叶片上，所述多个支柱包括一对外支柱，每个支柱分别连接在叶片的相应端部的一端并且面对另一个外支柱的锐角，以及一对 较短的内支柱，每个与叶片的中间位于叶片的端部之间并且以与其相邻的外支柱相对的锐角相连，使得响应于将叶片抵靠电路板施加的力，外支柱引起 叶片相对于板和内支柱减小了偏转的大小。 通过内部和外部支柱从变压器提供的电流对刀片进行加热。 叶片的接触表面中的台阶提供了可接受的窄的接合面积，同时允许使用期望的热质量厚的叶片。