Electrical Contact Alignment for Cantilever Probe Arrays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for aligning probe arrays parallel to substrates in lithography are tedious, prone to misalignment, and lack reliability, especially when dealing with elastomeric polymer pen arrays and gold film-coated tips, due to limited optical resolution and incompatibility with force feedback alignment strategies.
Innovation Solution
An electrical contact alignment strategy is employed, where the probe array and substrate form partially conductive regions connected to opposite electrodes, allowing for automated leveling by applying a voltage bias to induce a measurable electrical current, indicating contact, and iteratively adjusting the array's position to achieve precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual optical inspection is used to align probe arrays, then alignment can be performed, but the process is tedious and time-consuming
Solution Approach 1:
The patent replaces manual optical inspection with an automated electrical contact-based alignment system. Conductive regions are deposited on the probe array and substrate, and electrical contact is detected through current measurement, eliminating the need for manual optical inspection and significantly reducing alignment time
Solution Approach 2:
The alignment system uses the probe array and substrate themselves to perform the alignment function. By depositing conductive regions on both surfaces and measuring electrical contact, the system enables self-alignment without requiring external manual intervention or complex optical equipment
2Manufacturing precision
If manual optical inspection is used to align probe arrays, then alignment can be performed, but misalignment is prone to occur
Solution Approach 1:
The patent replaces error-prone manual optical inspection with automated electrical contact detection. The electrical contact method provides objective, quantifiable alignment criteria through current measurement, eliminating human error and improving both accuracy and reliability
Solution Approach 2:
The alignment system incorporates real-time feedback through electrical contact detection. By measuring current flow between conductive regions on the probe array and substrate, the system provides continuous feedback on alignment status, enabling precise adjustment and verification of parallelism
3Extent of automation
If force feedback alignment is used, then automated alignment is possible, but it is incompatible with elastomeric polymer pen arrays and gold film-coated tips
Solution Approach 1:
The patent changes the detection parameter from mechanical force to electrical contact. By depositing conductive regions on the probe array and substrate, the system detects alignment through electrical current measurement rather than mechanical force feedback, making it compatible with elastomeric polymer pens and gold film-coated tips that are incompatible with force-based methods
Solution Approach 2:
The patent replaces the mechanical force feedback system with an electrical contact detection system. This substitution enables automated alignment while being compatible with a broader range of probe materials and configurations, including elastomeric polymers and metal-coated tips
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
This approach enables rapid, reliable, and accurate alignment of probe arrays to within 0.005° in under 10 minutes, improving upon conventional methods by eliminating the need for manual inspection and overcoming limitations with force feedback and optical resolution constraints.
Implementation Method 1
application of a voltage bias is used to induce a measurable electrical current evidencing contact between a region of the substrate and a corresponding region of the array
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed embodiments provide an electrical contact alignment strategy for leveling an array of probes, pens, tips, etc., in relationship to a substrate, for example, wherein a plurality of independent electrical circuits are formed by configuring regions of the array and substrate regions to be partially conductive and connected to opposite electrodes or vice versa.