Liquid Ejecting Head Partition Wall Stress Relief
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Solution Overview
Problem
The existing ink jet recording heads face issues due to bending stress caused by differences in linear expansion coefficients between the passage forming substrate and the nozzle plate, leading to potential breaks and damage at the weakest areas, affecting the quality and performance of the recording head.
Innovation Solution
The implementation of an adhesive agent applied to the angular portions of the partition walls near the reservoir, which relieves stress and prevents cracks, enhancing the durability of the liquid ejecting head by distributing the adhesive through capillary action to secure the partition walls and vibration plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the passage forming substrate and nozzle plate are assembled together, then the liquid ejecting head can function, but bending stress occurs due to difference in linear expansion coefficients causing breaks and damage at the partition wall end portions
Solution Approach 1:
A resin layer is introduced as an intermediary substance between the passage forming substrate and the nozzle plate. This resin layer acts as a stress-absorbing mediator that compensates for the difference in linear expansion coefficients between the two substrates, thereby reducing bending stress on the partition walls while maintaining the functional assembly.
Solution Approach 2:
The invention changes the physical parameters of the interface between substrates by introducing a resin layer with specific elastic modulus and thickness. By adjusting the resin layer's thickness (0.01-0.5mm) and material properties, the overall stress distribution is modified to protect the partition walls from breaking under thermal expansion stress.
2Strength
If the partition walls are made thinner to reduce stress concentration, then stress resistance improves, but structural integrity and manufacturing precision deteriorate
Solution Approach 1:
The resin layer is applied beforehand between the substrates to provide cushioning and stress distribution before the partition walls are formed or before thermal cycling occurs. This pre-cushioning prevents stress concentration at the partition wall end portions, allowing thinner walls without compromising structural integrity.
3Strength
If adhesive agent is applied to the partition walls, then stress distribution improves, but manufacturing complexity increases
Solution Approach 1:
The invention merges the adhesive function with the stress-management function by using the resin layer that serves both as bonding material and as a stress-absorbing element. This eliminates the need for separate adhesive application steps while achieving both strong bonding and stress distribution, thereby reducing manufacturing complexity.
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 solution effectively reduces the risk of breakage and cracking, resulting in a more durable ink jet recording head with improved resistance to stress, thereby maintaining the performance and quality of the recording process.
Implementation Method 1
an adhesive agent adhered to a first angular portion formed in an end portion of the partition walls near the reservoir which is adjacent to the second base member
Data Source
AI summary
A liquid ejecting head including a first base member in which a plurality of pressure generating chambers communicating with nozzle openings and a series of partition walls are arranged in parallel, a second base member disposed on the first base member, a reservoir serving as a common liquid chamber for the pressure generating chambers, and an adhesive agent adhered to a first angular portion formed in an end portion of the partition walls near the reservoir which is adjacent to the second base member.