Title:
FORMING METHOD FOR BALL IN WIRE BONDER
Document Type and Number:
Japanese Patent JPS5917254
Kind Code:
A
Abstract:
PURPOSE:To prevent the displacement of the center of the ball and the thinning of a connecting section while forming the small ball by forming the ball in an atmosphere of compressed air. CONSTITUTION:Compressed air is blown off between a capillary 2 and an electric torch electrode 13 from a nozzle 12 through a tube 15 and a pipe 11 at all times or until bonding with the next first bonding point after forming the ball, high-voltage currents are flowed through the electric torch electrode 13, and a section between the tip of a wire 3 and the electric torch electrode 13 is sparked and the ball 3a is formed. Compressed air is blown off at flow rate of approximately 1.5-4l/min. The wire begins to melt from its tip section, a distance thereto from the electric torch electrode 13 is the shortest, at the beginning of sparking, but afterward much currents flow through the surface section at a low temperature, and the wire melts toward the inside from the surface. Accordingly, a section in the vicinity of the center of the wire 3 melts latest, and the ball 3a is formed while using the section 3c not melted as a core.
More Like This:
Inventors:
USHIKI HIROSHI
KADOSAWA MOTOAKI
TANAKA YUUJI
AOTO TAKAMICHI
KADOSAWA MOTOAKI
TANAKA YUUJI
AOTO TAKAMICHI
Application Number:
JP12514882A
Publication Date:
January 28, 1984
Filing Date:
July 20, 1982
Export Citation:
Assignee:
SHINKAWA KK
International Classes:
H01L21/60; (IPC1-7): H01L21/60
Domestic Patent References:
| JPS5789232A | 1982-06-03 | |||
| JPS5440570A | 1979-03-30 |
Attorney, Agent or Firm:
Yoshinori Tanabe