Liquid Ejection Head Protrusion Structure Against Nozzle Breakage

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Solution Overview

Problem

Conventional liquid ejection heads face issues with nozzle protrusions peeling off due to strong impacts, leading to potential nozzle breakage.

Innovation Solution

The design incorporates protrusions with base ends buried within the nozzle forming member, supported by the substrate, to withstand impacts and prevent peeling, while maintaining effective nozzle protection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a protrusion is formed on the nozzle surface to protect the nozzle from abutment, then the nozzle protection capability is improved, but the protrusion may peel off when strong impact is applied

Engineering Contradiction:

Improvenozzle protection capabilityVSAvoidprotrusion bonding strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The protrusion base end is embedded within the nozzle forming member, creating a nested structure where the protrusion is housed inside a recess portion of the nozzle forming member. This nesting configuration ensures that the protrusion remains securely positioned even under strong impact, preventing peeling while maintaining nozzle protection capability.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The protrusion structure transitions from a surface-level attachment to a multi-dimensional configuration by extending into the recess portion of the nozzle forming member. This dimensional change from 2D surface mounting to 3D embedded structure significantly enhances the protrusion's resistance to peeling under impact while preserving its protective function.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Strength

If the protrusion base end is buried inside the nozzle forming member, then the protrusion resistance to peeling is improved, but the manufacturing complexity increases

Engineering Contradiction:

Improveprotrusion bonding strengthVSAvoidnozzle forming member structure

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The recess portion is pre-formed in the nozzle forming member before the protrusion is attached or formed. This preliminary action of creating the recess structure simplifies the subsequent protrusion integration process, as the recess serves as a pre-prepared receptacle that guides and secures the protrusion base end, reducing overall manufacturing complexity despite the embedded configuration.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250388015A1Liquid ejection head and method for manufacturing liquid ejection head

Publication Date: 2025.12.25 CANON KK

AI summary

An object of the technique of the present disclosure is to provide a liquid ejection head having high reliability in which breakage of a nozzle is less likely to occur. A liquid ejection head comprises: a nozzle forming member in which a nozzle configured to eject a liquid is formed; a substrate being stacked on the nozzle forming member and including a flow passage for supplying the liquid to the nozzle; and a protrusion protruding more than a surface of the nozzle forming member, and having a base end in contact with the substrate, in a direction perpendicular to the surface of the nozzle forming member.