Solder preform carrier and use

Details Solder preform carrier and use Solder preform carrier and use

1992-12-04

1994-04-19

Foster, Jimmy G.

Special receptacle or package

For plate or sheet

34235, 118500, 206503, 206821, B65D 8562

Patent

active

053038240

ABSTRACT:
Clear thermoplastic is vacuum molded to produce rectangular, frustro-pyramidal shaped cavities in a horizontal matrix for holding rectangular solder preforms. No-clean flux liquid is dispensed onto a preform placed in each cavity, then another holder is placed upside-down on the first holder, the holders are flipped and then no-clean flux liquid is dispensed on the dry side of the preform. Holes in the cavity bottoms drain and circulate drying air to the preform bottoms. A hole in one corner and a different width slot in an opposite corner of each holder, allow multiple holders to be stacked on a bottom frame with different sized threaded posts. An empty holder and then a dust cover are stacked on the posts to hold and protect the preforms. A top frame is stacked on the posts and nuts are screwed onto the posts to form a carrier. The cavities are sized relative to the preforms to hold the preforms in position during carrier transport. The holders are unstacked and each positioned at a station with different sized posts on a rotating table of a pick-and-place machine. A robot arm with rubber tipped vacuum probe picks up the preforms and places them on a circuit board. Grippers on the arm are used to move a heated component on top of the preform for reflow soldering. The circuit board can be used without cleaning with solvents or CFC's.

REFERENCES:
patent: 3351192 (1967-11-01), La Plante
patent: 3396894 (1968-08-01), Ellis
patent: 3469686 (1969-09-01), Gutsche et al.
patent: 3482682 (1969-12-01), Cronkhite
patent: 3532247 (1970-10-01), Bridges
patent: 3596770 (1971-09-01), Heinrich
patent: 4209893 (1980-07-01), Dyce et al.
patent: 4210243 (1980-07-01), McDowell
patent: 4354629 (1982-10-01), Grassauer et al.
patent: 4511038 (1985-04-01), Miller et al.
patent: 4832208 (1989-05-01), Finnegan
patent: 4898275 (1990-02-01), Skrtic et al.

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