Browse Prior Art Database

Black Nickel Plating on a Copper Integrated Heat Spreader to Improve Assembly ID Recognition

IP.com Disclosure Number: IPCOM000100770D
Publication Date: 2005-Mar-16
Document File: 2 page(s) / 13K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method that modifies the nickel plating on an Integrated Heat Spreader (IHS) to increase the 2D matrix reflective properties of the IHS surface; improving the IHS surface in this way aids in the ID readability of the package.

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Black Nickel Plating on a Copper Integrated Heat Spreader to Improve Assembly ID Recognition

Disclosed is a method that modifies the nickel plating on an Integrated Heat Spreader (IHS) to increase the 2D matrix reflective properties of the IHS surface; improving the IHS surface in this way aids in the ID readability of the package.

Background

Currently, the brightness reflected off the nickel-over-copper plating  in the IHS material causes poor laser mark readability (see Figure 1). This creates manufacturing downtime when a repeat read out is necessary. 

Data encoded in the 2D matrix can be used by the lot mixing elimination (LME) feature of the laser mark machine (LSM). During the LSM process, if data retrieved from the database has mismatches, the lot is converted to non-LME; this lot undergoes 100% FQA, and therefore  burdens the testing process. The black nickel plating reduces the brightness reflection issue which interferes with LSM readability.

General Description

In the disclosed method, the black nickel plating finish is less than 3 microns, if plated over a  conventional nickel-plated undercoat (see Figure 2). It is corrosion protected and creates a dense black finish on any metal. The darker the background, the better the 2D matrix contrast for the LME readers. (The reflective surface of conventional nickel-plating interferes with the laser mark machine readability.) Conventional nickel-plating is still needed as an undercoat to plate the raw copper material...