Wedge-Shaped Printhead Carriage Airflow Management

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Solution Overview

Problem

Higher carriage speeds and closer printhead-to-substrate spacing in scanning type inkjet printers lead to adverse air flows, causing excessive pressure and turbulence that trap and displace smaller ink drops, degrading print quality.

Innovation Solution

A wedge-shaped carriage design with deflectors that sharply deflect oncoming air over the carriage, moderating air pressure and reducing turbulence by creating tapered leading and trailing parts to inhibit high and low pressure regions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If higher carriage speeds are used, then productivity is improved, but air flow turbulence increases causing ink drop displacement

Engineering Contradiction:

Improvecarriage speedVSAvoidair flow turbulence

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful air flow generated by high-speed carriage movement into a beneficial controlled flow pattern. The wedge-shaped deflector intentionally directs air flow away from the print zone, transforming the harmful turbulence into a controlled flow that actually protects ink drop placement accuracy during high-speed operation

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Manufacturing precision

If closer printhead-to-substrate spacing is used, then manufacturing precision is improved, but air pressure variations increase causing ink drop displacement

Engineering Contradiction:

Improveink drop placementVSAvoidair pressure

Core Design Contradiction:

Manufacturing precisionVSStress or pressure

Solution Approach 1:

The wedge-shaped deflector acts as an intermediary element between the moving carriage and the air flow. It mediates the interaction by redirecting air flow before it can create harmful pressure variations in the print zone, thereby protecting ink drop placement precision even at closer printhead-to-substrate spacing

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If wedge-shaped carriage design is used, then air flow turbulence is reduced, but device complexity increases

Engineering Contradiction:

Improveair flow turbulenceVSAvoidcarriage structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent addresses air flow turbulence not by modifying the printhead or substrate, but by introducing a geometric feature (wedge shape) in the vertical dimension of the carriage structure. This dimensional approach to flow control effectively reduces turbulence while maintaining relative simplicity of the overall device

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 design improves ink drop placement and print quality by minimizing air flow and turbulence under the carriage, allowing for higher speed operations with smaller ink drops.

Implementation Method 1

A wedge shaped carriage deflects much of the oncoming air sharply over the carriage to inhibit the formation of an undesirably high pressure region at the leading part of the carriage

Methodology Applied

Scientific EffectAir deflection: Aerodynamic Heating