Compliant Beam Alignment Mechanism for Thermal Head Contact

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Solution Overview

Problem

Existing thermal control systems face challenges in maintaining uniform contact force and alignment between thermal heads and semiconductor devices, leading to potential misalignment and increased thermal resistance, which can result in stress concentrations and reduced heat transfer efficiency.

Innovation Solution

An alignment mechanism featuring a rigid beam with a high longitudinal stiffness and orthogonal flexibility, allowing for the application of a normal force component while accommodating angular misalignment and lateral movement, is used to ensure centralized contact force distribution and reduce thermal resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a sliding interface is used to allow lateral adjustment of the thermal head, then misalignment is compensated, but frictional forces increase with applied force, reducing ease of motion

Engineering Contradiction:

Improvealignment between thermal head and deviceVSAvoidease of motion of thermal head

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent replaces the sliding interface mechanical system with a compliant beam mechanism. The beam uses elastic deformation to accommodate misalignment instead of friction-based sliding, substituting a high-friction mechanical interface with a compliant structural element that deforms elastically to allow lateral movement while maintaining low resistance.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the mechanical parameters of the beam (length, cross-sectional dimensions, material properties) to optimize the balance between rigidity for force transmission and compliance for lateral movement. By adjusting these parameters, the beam provides sufficient stiffness to transmit normal force while remaining compliant enough to accommodate misalignment without excessive friction.

Inventive Principle:

Principle #35Parameter changes

2Temperature

If sufficient contact force is applied to maximize thermal transfer, then heat transfer efficiency improves, but device damage risk increases

Engineering Contradiction:

Improveheat transfer efficiencyVSAvoiddevice damage from excessive force

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The compliant beam acts as an intermediary element between the thermal head and the device. It provides a mechanical compliance mechanism that limits the maximum contact force transmitted to the device, serving as a protective intermediary that allows sufficient force for heat transfer while preventing excessive force that could cause damage.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The compliant beam structure provides beforehand cushioning by its inherent elasticity. The beam deforms elastically under load, absorbing excess force before it reaches the device, thus providing prior protection against force-related damage while maintaining adequate contact pressure for thermal transfer.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Force

If external forces cause off-center contact force application, then alignment between contact surfaces deteriorates, but the thermal head must apply larger force to overcome these external forces

Engineering Contradiction:

Improvecontact force magnitudeVSAvoidalignment and uniformity of contact force

Core Design Contradiction:

ForceVSManufacturing precision

Solution Approach 1:

Inventive Principle:

Principle #35Parameter changes

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 alignment mechanism effectively maintains uniform pressure distribution and reduces thermal resistance between the thermal control unit and semiconductor device, preventing slipping and damage, while ensuring efficient heat transfer and maintaining device integrity during testing.

Implementation Method 1

The beam is an order of magnitude more rigid along its longitudinal axis than along an axis orthogonal to its longitudinal axis. The second end of the beam allows movement in directions orthogonal to the normal force component

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS9500701B2Alignment mechanism

Publication Date: 2016.11.22 DELTA DESIGN INC

AI summary

An alignment mechanism is disclosed which includes a mount, a beam having a first end affixed to the mount and a second end. The beam is an order of magnitude more rigid along its longitudinal axis than along an axis orthogonal to its longitudinal axis. The second end of the beam is affixed to a first device having a surface configured to contact a second device. The beam applies a normal force component to the second device through the first device and allows movement at the second end in directions orthogonal to the normal force component.