Flexible Substrate Tensioner with Segmented Clamp

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Solution Overview

Problem

Existing methods for handling flexible substrates often result in distortion, breakage, or limited post-processing options due to inadequate tensioning and thermal expansion mismatches, and require complex handling steps or exotic materials.

Innovation Solution

A tensioning apparatus comprising a clamp with knife edges and feet, and a pallet with a guide ring that allows for reproducible and reversible tensioning of flexible substrates, ensuring planarity before, during, and after processing, without the need for exotic materials or complex handling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a split frame is used to tension the flexible substrate, then the substrate can be tensioned, but the substrate may distort or require additional flattening steps

Engineering Contradiction:

Improvesubstrate tensioningVSAvoidhandling complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The clamp is divided into multiple segments or jaws that can independently engage with the frame, allowing distributed tensioning force application that prevents substrate distortion while maintaining tensioning capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary mechanism between the clamp and substrate that distributes and controls the tensioning force, preventing direct concentration of force that would cause distortion while still achieving reliable tensioning

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If flattening means are added to the frame, then substrate distortion is corrected, but handling complexity increases

Engineering Contradiction:

Improvesubstrate planarityVSAvoidframe complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The frame is pre-configured with built-in flattening features during manufacturing, so that substrate planarity is achieved automatically during the tensioning process without requiring separate flattening operations or additional handling steps

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The flattening function is merged with the frame structure itself, combining the support and flattening functions into a single integrated component rather than adding separate flattening means

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If thermally relative substrate handling is used with high CTE frame material, then the substrate becomes tensioned when heated, but exotic frame materials are required and cost increases

Engineering Contradiction:

Improvesubstrate tensioningVSAvoidframe material availability

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces the thermal expansion-based tensioning mechanism with a direct mechanical tensioning system using the clamp, eliminating the need for thermally responsive frame materials while achieving reliable substrate tensioning

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The tensioning mechanism is changed from being thermally dependent to being mechanically controlled, allowing tensioning force to be applied independently of temperature changes and material CTE properties

Inventive Principle:

Principle #35Parameter changes

4Reliability

If CTE mismatch between substrate and frame is used, then substrate tensioning is achieved, but substrate breakage or distortion may occur

Engineering Contradiction:

Improvesubstrate tensioningVSAvoidsubstrate breakage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces thermal expansion-based tensioning with direct mechanical tensioning through the clamp, eliminating the harmful effects of CTE mismatch while achieving reliable substrate tensioning without breakage or distortion

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The clamp mechanism is designed to apply tensioning force in a controlled and distributed manner before processing, cushioning against potential substrate breakage by avoiding sudden or concentrated force application

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

5Reliability

If the substrate is laminated onto a rigid frame, then the substrate is permanently fixed, but post-processing options are limited

Engineering Contradiction:

Improvesubstrate fixationVSAvoidpost-processing options

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent creates a dynamic, adjustable tensioning system using the clamp that allows the substrate to be fixed during processing and then easily released for post-processing operations, replacing permanent lamination with reversible mechanical tensioning

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The clamp-based tensioning system allows the substrate to be recovered after processing by releasing the clamp, eliminating the permanent fixation of lamination and enabling substrate reuse or further processing

Inventive Principle:

Principle #34Discarding and recovering

Data Source

PatentUS8490271B2Flexible substrate tensioner

Publication Date: 2013.07.23 UNIVERSAL INSTR CORP

AI summary

Apparatus and method to aid in the reproducible and reversible tensioning of flexible substrates, such as polyimide or other file, to ensure planarity before, during, and after processing while mounted in tensioning apparatus.