APPARATUS FOR PROFILING BONDING NEEDLES

• US 3,768,211 A
• Filed: 06/24/1971
• Issued: 10/30/1973
• Est. Priority Date: 09/18/1969
• Status: Expired due to Term

• Current Assignee: Charles G. Thornton, Harry Da Costa
• Original Assignee: Charles G. Thornton, Harry Da Costa
• Inventors: Da Costa, Harry, Thornton, Charles G.
• Primary Examiner(s): Kelly, Donald G.
• Application Number:
  US05/156,523
• Time in Patent Office: 859 Days
• Field of Search: 51/8-10,15,227R,227H,131
• US Class Current: 451/82
• CPC Class Codes: B21G 1/006 Special treatments of pins or needles, e.g. annealing, straightening
• CPC Class Codes: B23K 20/005 Capillary welding
• CPC Class Codes: B23K 20/26 Auxiliary equipment
• CPC Class Codes: H01L 2224/05599 Material
• CPC Class Codes: H01L 2224/45099 Material
• CPC Class Codes: H01L 2224/48 of an individual wire connector
• CPC Class Codes: H01L 2224/78301 Capillary
• CPC Class Codes: H01L 24/78 Apparatus for connecting with wire connectors
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/01013 Aluminum [Al]
• CPC Class Codes: H01L 2924/01015 Phosphorus [P]
• CPC Class Codes: H01L 2924/01033 Arsenic [As]

Abstract

In the bonding of a conductive wire to an electrical apparatus, the wire runs down through the hole in a hollow needle and extends at an angle of about 90 degrees with the needle at the tip thereof and the wire as it exits from the needle is bonded to a bonding pad comprising part of an electrical apparatus by a combination of pressure and heat. If the inside and outside profiles of the tip of the hollow needle are not properly rounded, bad bonds will result in that the wire may break. Abrasive blast means are disclosed for giving the tip of the needle a proper smooth and rounded profile both internally and externally.

Claims

1. An abrasive apparatus for dressing a hollow bonding tool having a tip and body axially of each other comprising a chuck having an axis for axially holding such body of such tool, means for rotating said hollow bonding tool, and nozzle means disposed along said axis and away from said tip and said body for projecting abrasive materials in the direction of said axis and towards said tip.