Fluid Ejector Compartmentalization via Descending Housing Barrier

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Solution Overview

Problem

Fluid droplet ejection devices face issues with moisture intrusion into electrical and actuating components, leading to failure due to electrical shorting and degradation of piezoelectric materials, and existing protective measures like coatings and desiccants are either ineffective or mechanically challenging to implement.

Innovation Solution

A physical barrier is placed between the integrated circuit chip and piezoelectric actuators to prevent contamination, combined with a sealing compound and absorbent layers to manage moisture, and a protective layer is applied to reduce permeability and extend device lifetime.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a physical barrier is placed between the integrated circuit chip and piezoelectric actuators, then protection from moisture and contamination is improved, but device complexity increases

Engineering Contradiction:

Improveprotection from moisture and contaminationVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The device is divided into distinct regions: an integrated circuit chip region and an actuator region, separated by a physical barrier (housing component with descending portion). This segmentation isolates moisture-prone areas from sensitive electronic components, providing protection without requiring complex sealing mechanisms throughout the entire device.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A housing component with a descending portion acts as an intermediary barrier between the integrated circuit chip and piezoelectric actuators. This intermediate structure creates a physical separation that prevents moisture and potting material from reaching the actuators, while still allowing the device to function as a unified system.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If potting material is applied to secure the integrated circuit chip, then manufacturing reliability is improved, but risk of actuator contamination increases

Engineering Contradiction:

Improvechip attachment reliabilityVSAvoidactuator contamination

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The device structure segments the potting material application zone (over the integrated circuit chip) from the actuator zone. The housing component with its descending portion creates a boundary that contains the potting material within the chip region, preventing it from flowing onto and contaminating the piezoelectric actuators during the potting process.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The housing component serves as an intermediary barrier that allows potting material to be applied securely to the integrated circuit chip while blocking the material from reaching the actuators. This intermediate structure enables the potting process to proceed without compromising actuator cleanliness.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If protective coatings are applied to actuators, then moisture protection is improved, but manufacturing complexity and cost increase

Engineering Contradiction:

Improvemoisture protectionVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Instead of applying protective coatings directly to the actuators, the solution extracts the protection function to a separate housing component with a descending portion. This barrier structure provides moisture protection for the actuators without requiring complex coating processes, reducing manufacturing complexity while maintaining reliability.

Inventive Principle:

Principle #2Taking out (Extraction)

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 effectively protects piezoelectric actuators from moisture, increasing the device's lifetime by preventing contamination and electrical issues, while allowing for reliable potting of IC chips without impairing actuator functionality.

Implementation Method 1

The actuators may be piezoelectric actuators

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

A physical barrier can block or impede the flow of potting compound from the region where the IC chip is attached to the substrate to the piezoelectric actuator region

Methodology Applied

Scientific EffectPhysical barrier: Physical Containment

Implementation Method 3

an absorbent layer may be inside the housing component

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 4

a protective layer is applied to reduce permeability and extend device lifetime

Methodology Applied

Scientific EffectPermeability reduction: Permeation

Data Source

PatentUS8573508B2Compartmentalization of fluid ejector device

Publication Date: 2013.11.05 FUJIFILM CORP

AI summary

A fluid ejection apparatus includes a substrate having a plurality of fluid passages for fluid flow and a plurality of nozzles fluidically connected to the fluid passages, a plurality of actuators positioned on top of the substrate to cause fluid in the plurality of fluid passages to be ejected from the plurality of nozzles, a housing component with a descending portion that projects down to the substrate, an integrated circuit chip supported on the substrate, a potting barrier secured to the housing component and positioned between the integrated circuit chip and the actuators, and a potting material between the integrated circuit chip and the barrier.