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Method and apparatus for strain monitoring of printed circuit board assemblies

A printed circuit board, circuit board technology, applied in the direction of printed circuit stress/deformation reduction, printed circuit components, printed circuits, etc., can solve expensive and other problems

Inactive Publication Date: 2009-06-17
CISCO TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Components and printed circuit boards are not expensive individually, but together create an expensive item
Additionally, there is a time and cost factor when determining which printed circuit board assembly (PCBA) is working and which is not

Method used

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  • Method and apparatus for strain monitoring of printed circuit board assemblies
  • Method and apparatus for strain monitoring of printed circuit board assemblies
  • Method and apparatus for strain monitoring of printed circuit board assemblies

Examples

Experimental program
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Embodiment Construction

[0025] An improved method of testing / monitoring a printed circuit board assembly (PCBA) for strain-induced failure utilizes at least one strain detector mounted on the printed circuit board, wherein the strain detector is formed from a non-ductile material . The strain detector has a narrow section in order to limit the weakest link of failure to a predetermined strain range. Malfunction of the strain detector and strain reaching a critical strain range can be determined visually or electrically. Therefore, the traditional method of using strain gages with associated costs and limited to sampling the PCBA is unnecessary.

[0026] When referring to the drawings in the ensuing description, like numerals indicate like elements. figure 1 Strain detector 20 is shown positioned on printed circuit board (PCB) 24 of printed circuit board assembly (PCBA) 26 .

[0027] refer to figure 1 , a printed circuit board assembly (PCBA) is shown. The PCBA 26 has a series of components 28 su...

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PUM

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Abstract

A technique of monitoring strain on a printed circuit board assembly involves the use of a strain detector mounted on a printed circuit board. The strain detector is formed of a non-ductile material. The strain detector has a narrowed portion forming a weak link that has a characteristic of breaking when a critical strain limit is exceeded. The method of monitoring can include visual or electrical inspection. The electrical inspection can include having a strain monitoring device. The strain monitoring device has a timer connected to at least one strain detector and a memory for storing results connected to the timer. The capacitance of at least one of the strain detectors is sampled and any change in capacitance is recorded to the memory. In one embodiment, a time stamp occurs in the memory based on when an electrical property changes across at least one of the strain detectors.

Description

Background technique [0001] Printed circuit board assemblies (PCBAs) are used in a variety of devices including computers, telephones, white goods, vehicles such as automobiles, trains and airplanes, and toys. Printed circuit boards (PCBs) are increasingly crowded with items such as integrated circuits, resistors, heat sinks, and other components. [0002] In order to create a printed circuit board and add components to the printed circuit board in order to create a complete printed circuit board assembly, a series of processes are required. Unfortunately, as a result of the PCBA manufacturing process, not every PCBA works perfectly. Components and printed circuit boards, while not expensive individually, together create an expensive item. Additionally, there is a time and cost factor in determining which printed circuit board assemblies (PCBAs) are working and which are not. In some cases, the cost and time involved in detecting non-functioning PCBAs is unacceptable, thus ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/22
CPCH05K2203/163H05K1/0271G01R31/2817H05K2201/10151H05K1/0268
Inventor 穆达瑟·艾哈迈德休·腾
Owner CISCO TECH INC
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