The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 08, 1994
Filed:
Aug. 31, 1992
Applicant:
Inventors:
Howard P Wilson, Austin, TX (US);
Fonzell D Martin, Austin, TX (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
2281802 ; 427 96 ; 228254 ;
Abstract
Conductive balls (44), preferably solder balls, are attached to pads (32) on a substrate (30) using a vacuum pick-up tool (34). The pick-up tool lowers the conductive balls into a bath of flux (48) without allowing the balls to touch the bottom of a recess (47) in a flux plate (46), thereby reducing the likelihood of dislodging the solder balls from the pick-up tool. The pick-up tool withdraws the balls from the flux, and aligns the balls with the respective pads on the substrate. Once positioned, the balls are released from the pick-up tool. A reflow operation metallurgically bonds the balls to the pads.