| 摘要 |
<p>PURPOSE:To produce a ball on the center line of a wire by completing an inactive gas atmosphere at a wire tip using a little amount of jet streams without contact to the air to prevent oxidization. CONSTITUTION:After a semiconductor element 8 and a case 9 are connected with each other, both a capillary 1 and a wire 3 are made to rise and simultaneously Ar gas is sent from a tube 6 to a cylinder 7 to discharge it from upper and lower openings 7a and produce an Ar atmosphere at a space 7b with a little amount of jet steams. The cylinder 7 is made to rise behind the capillary 1, the capillary 1 and the wire tip are disposed in the inside of the cylinder, an electrode 4 is simultaneously advanced and made to position right under the wire tip to produce a ball 3a. The surface of the ball 3a is not oxidized and the ball 3a is formed on the center line of the wire, because there is a little amount of jet streams of Ar gas. Next, if the electrode 4 is made to retreat, the cylinder 7 falls behind the capillary 1, thereby connecting the element 8 and the case 9 again. This constitution allows defective connection or scratches on the electrode surface of the element to be prevented.</p> |
