Liquid Ejecting Head Filter Inclination Molding

Solution Overview

Problem

Ink jet printing heads face issues with bubble discharging performance degradation due to filter deformation and adhesion to inner walls during the molding process, leading to blockages and reduced efficiency in bubble removal.

Innovation Solution

A liquid ejecting head design featuring a filter sandwiched between two supply members with an integral molding configuration, including an inclination portion that protrudes towards the downstream side, preventing deformation and maintaining a sufficient gap for bubble discharging, and optionally using protrusion members to support the filter and regulate its shape.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the filter is disposed between the cartridge casing and the ink supply needle to remove bubbles and sediments, then ejection errors such as dot skipping are reduced, but the filter may be deformed and depressed toward the inner wall surface of the channel during the integral molding process, causing adhesion or blockage that degrades bubble discharging performance

Engineering Contradiction:

Improveejection performanceVSAvoidfilter position and shape

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent applies preliminary action by pre-positioning support members (protrusions or ribs) in the channel structure before the integral molding process. These support members are designed to prevent filter deformation and adhesion during manufacturing, thereby maintaining manufacturing precision while preserving the filter's bubble removal function

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces support members as intermediary elements between the filter and the channel wall. These support members act as mediators that prevent direct contact and adhesion between the filter and the channel during the molding process, thus maintaining both manufacturing precision and operational reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If the filter is deformed and depressed toward the inner wall surface of the channel during the integral molding process, then the filter may adhere to the inner wall surface or block the channel during bubble discharging operations, but this deformation and adhesion degrade bubble discharging performance

Engineering Contradiction:

Improveintegral molding processVSAvoidbubble discharging performance

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent applies preliminary action by pre-positioning support members (protrusions or ribs) in the channel structure before the integral molding process. These support members are designed to prevent filter deformation and adhesion during manufacturing, thereby maintaining manufacturing precision while preserving the filter's bubble removal function

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces support members as intermediary elements between the filter and the channel wall. These support members act as mediators that prevent direct contact and adhesion between the filter and the channel during the molding process, thus maintaining both manufacturing precision and operational reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

3Stability of the object's composition

If the filter is twisted to adhere to the inner wall surface of the channel on the downstream side, then bubbles tend to assemble between the twisted filter and the inner wall surface, but this reduces bubble discharging efficiency

Engineering Contradiction:

Improvefilter orientationVSAvoidbubble discharging efficiency

Core Design Contradiction:

Stability of the object's compositionVSProductivity

Solution Approach 1:

The patent applies preliminary action by pre-positioning support members (protrusions or ribs) in the channel structure before the integral molding process. These support members are designed to prevent filter deformation and adhesion during manufacturing, thereby maintaining manufacturing precision while preserving the filter's bubble removal function

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces support members as intermediary elements between the filter and the channel wall. These support members act as mediators that prevent direct contact and adhesion between the filter and the channel during the molding process, thus maintaining both manufacturing precision and operational reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS8820905B2Liquid ejecting head and liquid ejecting apparatus

Publication Date: 2014.09.02 SEIKO EPSON CORP

AI summary

A liquid ejecting head includes: a head body which ejects a liquid supplied from a liquid storing member via a liquid supply path; a first supply member which is provided with a first liquid supply path forming a part of the liquid supply path; a second supply member which is provided with a second liquid supply path communicating with the first liquid supply path and forming a part of the liquid supply path, and which supplies the liquid to the head body; and a filter which is sandwiched between the first and second liquid supply paths, wherein a sandwiching portion including the first and second supply members and sandwiching the filter includes an inclination portion that is inclined to the downstream side so as to face the outside of the liquid supply path. A liquid ejecting apparatus includes the liquid ejecting head.