# US 6,296,169 B1 · Flux-application fixture for a ball-grid-array (BGA) assembly process

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- Number: US 6,296,169 B1
- Document ID: US6296169B1
- Status: Granted
- Kind: B1
- Application number: 09/589,640
- Filed: 2000-06-07
- Granted: 2001-10-02
- Earliest claimed: 2000-06-07
- Assignees: Advanced Interconnect Solutions
- Inventors: E. C. Ong
- Web page: https://patentgrep.com/patent/US6296169B1

## CPC

- B23K 1/203: {Fluxing, i.e. applying flux onto surfaces}
- H05K 3/3489: Composition of fluxes; Application thereof; Other processes of activating the contact surfaces
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

A flux-application fixture for applying flux to die pads in a ball-grid-array assembly process is provided. The fixture comprises a solid plate having a lower surface and an upper surface and a plurality of flux pins formed in the upper surface of the solid plate. The flux pins are contiguous with the solid plate and are formed by removing material from the upper surface of the plate such that the remaining material not removed forms the plurality of flux pins. In a preferred application the material is removed by grinding and the flux plate is ground flat to tight tolerance before removing the material to form the flux pins.

## Claims

### Claim 1

A flux-application fixture for applying flux to die pads in a ball-grid-array assembly process comprising:
a solid state plate having a lower surface and an upper surface; and
a plurality of flux pins formed in the upper surface of the solid plate;
characterized in that the flux pins and the plate are formed as one contiguous element from a single piece of durable material.

### Claim 2 (depends on 1)

The flux-application fixture of claim 1, wherein the material forming the plate and the pins is stainless steel.

### Claim 3 (depends on 1)

The flux-application fixture of claim 1, wherein the material forming the plate and the pins is a composite of nickel and steel.

### Claim 4 (depends on 1)

The flux-application fixture of claim 1, wherein the flux pins are rectangular in shape having upper surfaces, and corners and edges of the rectangular shape of the pins are rounded by virtue of smoothing the corners and edges of the rectangular shaped pins.