Bond Tester Shear Height Control via Hydraulic Displacement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing bond testers face limitations in achieving precise alignment accuracy for the shear height and step back height during mechanical testing of electrical connections, typically limited to ±1 μm, which can be improved for more accurate bond strength and material testing.
Innovation Solution
A bond tester apparatus comprising a force measurement module with a shear tool, a displacement module with a movable rigid body and displacement sensor, and a controller to accurately set the shear height by controlling the displacement distance between the force measurement module and the base, using a displacement member that can act as a shock absorber and be controlled hydraulically or pneumatically to maintain constant distance and achieve submicron repeatability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional alignment methods are used for shear height and step back height, then the device structure remains simple, but the alignment accuracy is limited to ±1 μm
Solution Approach 1:
The patent replaces conventional mechanical alignment methods with a displacement member that uses hydraulic or pneumatic principles to control the position of the force measurement module. This substitution enables submicron repeatability (0.1 to 0.01 μm) by using fluid pressure control instead of purely mechanical positioning, thereby achieving higher measurement precision while accepting increased device complexity through the addition of hydraulic/pneumatic components
Solution Approach 2:
The patent explicitly employs hydraulic or pneumatic principles through the displacement member, which uses fluid pressure to control the position of the force measurement module relative to the base. The displacement member can be controlled hydraulically or pneumatically to maintain constant distance and achieve submicron repeatability, directly addressing the alignment accuracy limitation of conventional mechanical systems
2Reliability
If the displacement member acts as a shock absorber to absorb shock during contact, then the measurement reliability improves, but the device complexity increases
Solution Approach 1:
The displacement member is designed to act as a shock absorber that absorbs shock when the shear tool comes into contact with the base. This beforehand cushioning mechanism protects the force measurement module and displacement sensor from damage during the testing process, thereby improving measurement reliability. The shock absorption capability is integrated into the displacement member's structure, which already controls positioning, so the complexity increase is moderate compared to adding a separate shock absorption system
Solution Approach 2:
The displacement member serves multiple functions: it controls the position of the force measurement module, maintains constant distance between modules, absorbs shock during contact, and enables submicron repeatability. By combining these functions into a single component that can be controlled hydraulically or pneumatically, the patent improves reliability without proportionally increasing device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables precise alignment with an accuracy of 0.1 to 0.01 μm, significantly improving the measurement of bond strength and failure mode analysis by maintaining consistent displacement and absorbing shocks during contact, thus enhancing the reliability of bond testing.
Implementation Method 1
the displacement member is arranged to connect the displacement module to the force measurement module in such a way that the distance between these modules is kept constant. The displacement member is then arranged to absorb a shock, i.e. the shear tool comes in contact with the base.
Implementation Method 2
an, in use, vertically expandable chamber, wherein said piston is connected, at another end, to an expandable part of said chamber; an inlet/outlet port for introducing, and removing, a fluid in, from, said expandable chamber for expanding, and shrink, said expandable chamber
Implementation Method 3
It may thus operate as an active element by using a hydraulic or pneumatic principle, or anything alike.
Data Source
AI summary
A bond tester apparatus arranged for determining a strength of a bond and/or a material present on a base, said bond tester apparatus comprising a force measurement module for applying a shear force to said bond and/or said material, and a displacement module and a controller arranged for controlling the distance between the force measurement module and the displacement module such that the shear height of a shear tool can be set.