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US 4,871,110 AGranted
Method and apparatus for aligning solder balls
AssigneeHitachi, Ltd.
InventorsHideyuki Fukasawa, Mamoru Kobayashi, Masahiro Wanami
Life of this patent
Estimating the term…
Abstract
Solder balls are supplied onto an aligning plate having aligned through-holes formed therein. Air is sucked from the bottom of the above described aligning plate to fit and attract solder balls into the above described through-holes. Solder balls are thus aligned with high work efficiency.
Claims10
A method for aligning solder balls having an outer diameter comprising the steps of:
- supplying solder balls onto an aligning plate having through-holes formed therein, each of said through-holes having a first hole and a second hole connected to said first hole, said first hole having a slightly larger diameter than the outer diameter of the solder ball to be aligned and being open to one surface of said aligning plate, and said second hole having a diameter smaller than the outer diameter of the solder ball and being open to another surface of said aligning plate;
- applying a vacuum from said another surface of said aligning plate through said through-holes;
- attracting and fitting solder balls existing on said aligning plate into said first holes with said vaccum;
- and
- positioning and attracting solder balls into said second holes.
2 more elements
The method of aligning solder balls of claim 14, further comprising the step of:
- supplying an excess number of solder balls so that aligned ones of the solder balls are positioned in said second holes and excess ones of the solder balls are positioned outside the first holes, and removing the excess solder balls from said aligning plate by moving the excess solder balls across said one surface of the aligning plate without disturbing the positioning of the aligned ones of the solder balls.
An apparatus for aligning solder balls, comprising
- an aligning plate having aligned through-holes formed therein for aligning solder balls supplied on said aligning plate;
- an aligning plate fixing block for fixing said aligning plate;
- an air suction nozzle coupled to said aligning plate fixing block;
- said aligning plate including a lower plate and an upper plate;
- first through-holes having a smaller diameter than an outer diameter of solder balls to be aligned, said first through holes being open at posiitons of said lower plate corresponding to alignment posiitons;
- and
- second through-holes having a diameter larger than an outer diameter of solder balls to be aligned, said second through-holes being open at positions of said upper plate corresponding to said first through-holes in said lower plate.
4 more elements
Dependencies are inferred from the claim text.