Liquid Ejecting Head Resin Cover Layer Chemical Stability
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Solution Overview
Problem
Existing liquid ejecting heads are prone to chemical influences from the ink, which can affect the adhesion and durability of the resin layers used in their construction, leading to reliability issues.
Innovation Solution
The liquid ejecting head incorporates a resin cover layer made from a second resin that is chemically more stable than the resin layer, with the cover layer being used to protect the resin layer from chemical influences, and is bonded to the sealing member and actuator using the same resin, forming a protective barrier between the ink and the resin layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin layer is used to bond the sealing member to the flow path forming member, then the adhesion and durability are improved, but the resin layer becomes susceptible to chemical influences from the ink
Solution Approach 1:
A resin cover layer is introduced as an intermediary protective barrier between the ink and the resin layer. This cover layer, formed from a second resin different from the first resin used in the bonding layer, protects the bonding resin from direct contact with the ink while maintaining the adhesion function. The cover layer is formed by a third resin that is chemically stable against the ink, thus preventing chemical degradation of the bonding interface.
Solution Approach 2:
The sealing member structure is enhanced as a composite construction with multiple resin layers. The first resin forms the bonding layer between the sealing member and flow path forming member, while the second resin forms the protective cover layer. This composite structure combines the adhesion properties of the first resin with the chemical stability of the second resin, achieving both reliable bonding and resistance to ink chemical influences.
2Ease of manufacture
If the same resin is used for the resin layer and resin cover layer, then the manufacturing process is simplified, but the protective function against chemical influences is reduced
Solution Approach 1:
Different resin materials are applied to different regions of the sealing member structure based on their specific functional requirements. The first resin is used in the bonding layer where adhesion is critical, while the second resin is used in the cover layer where chemical stability against ink is critical. This local differentiation of material properties ensures optimal performance for each region while maintaining overall structural integrity.
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 configuration effectively prevents or reduces chemical influences on the resin layer, enhancing the adhesion reliability and durability of the liquid ejecting head, even when using organic solvent-based or photocurable inks.
Implementation Method 1
a piezoelectric oscillator which generates a change in pressure of a liquid in a pressure chamber in response to an applied electric signal
Implementation Method 2
a sealing plate (oscillation plate) which seals openings of the flow path base portions of this flow path forming substrate... a diaphragm portion which changes the volume of the pressure chamber
Data Source
AI summary
A head includes a first flow path forming member in which a first flow path communicating with a nozzle opening is formed, a sealing member which seals an opening of the first flow path, and a second flow path forming member which has a second flow path to supply a liquid to the first flow path. A communication portion of the first flow path communicates with a communication portion of the second flow path via a communication port of the sealing member interposed therebetween. The sealing member includes a diaphragm layer which forms one surface of the first flow path and a resin layer laminated on the diaphragm layer, and at least a part of an inside wall of the communication port is covered with a resin cover layer formed from a second resin different from a first resin which forms the resin layer.