Browse Prior Art Database

Push-Down Rod with Force Sensitive Resistance in Test Fixture for Board Flex Measurement and Monitoring System

IP.com Disclosure Number: IPCOM000034130D
Publication Date: 2005-Jan-17
Document File: 3 page(s) / 39K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method that embeds a force sensitive resistance (FSR) in the push-down rod (PDR) of a test fixture. Benefits include a solution that identifies problems in real-time, so fixes can be implemented earlier to prevent expensive board damage and repair costs.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Push-Down Rod with Force Sensitive Resistance in Test Fixture for Board Flex Measurement and Monitoring System

Disclosed is a method that embeds a force sensitive resistance (FSR) in the push-down rod (PDR) of a test fixture. Benefits include a solution that identifies problems in real-time, so fixes can be implemented earlier to prevent expensive board damage and repair costs.

Background

Most test fixtures used to test boards apply pressure to the board/component. In the ODM environment, test fixtures usually have a push-down-rod to retain the board during fixture actuation. The number of push-down-rods correlate to the number of probes underneath the DUT to ensure boards have the same amount of pressure applied to them. During fixture fabrication, strain measurements ensure certain critical localized board strains are within specific limits to prevent any damage to the board/component.

However, once the fixture is used in a High Volume Manufacturing (HVM) environment, these push-down-rods are susceptible to damage due to excessive mechanical actuation. The board/component under test may become damaged if any of the push down rods are tilted, broken, or loosened. Currently, there is no way to proactively monitor the condition of the push-down rods in the HVM environment.

General Description

In the disclosed method, the FSR is embedded or snapped on to the push-down rod in the test fixture (see Figure 1). The FSR is mounted at a point on the rod where vertical flexure measurement sensitivity can be monitored; wires are routed along with the rod to a resistance-to-voltage converter. This converter circuitry can b...