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Method for the fiducial-point marking for SMT connectors

IP.com Disclosure Number: IPCOM000019857D
Publication Date: 2003-Oct-01
Document File: 2 page(s) / 73K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for the fiducial-point marking for surface mount technology (SMT) connectors. Benefits include improved functionality and improved performance.

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Method for the fiducial-point marking for SMT connectors

Disclosed is a method for the fiducial-point marking for surface mount technology (SMT) connectors. Benefits include improved functionality and improved performance.

Background

         Fiducial points are fixed points that are used for referencing location. Conventionally, no standard recognition point exists on SMT connectors for use by a replacement machines’ vision system. Solder balls are typically used as recognition points (see Figure 1). However, the vision system does not always recognize the correct point due to changes in the ball brightness and shape. As a result, components can be misplaced on printed circuit boards (PCBs). Additionally, the vision system does not detect the polarity of the component.

General description

         The disclosed method is fiducial point marking on SMT connectors. At least two markings per component are defined at strategic locations on connectors. The method reduces mispick errors and provides foolproof polarity checking.

Advantages

         The disclosed method provides advantages, including:

•         Improved functionality due to providing reliable polarity checking

•         Improved performance due to reducing mispick errors

Detailed description

         The disclosed method provides a detection point that is not prone to changes and serves as a placement indicator and polarity check. The disclosed method uses the machine vision system to detect incorrect polarity by marking the fiducial points at nonsymmetrical po...