Liquid Discharge Head Joint Structure for Crosstalk Reduction
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Solution Overview
Problem
Existing liquid discharge heads are prone to deterioration due to the entry of foreign substances at the bond face of the holder, leading to crosstalk and reduced field rates.
Innovation Solution
The liquid discharge head features a novel joint structure with a first joint around the periphery and multiple second joints inside, creating non-contact areas and reducing the bond face, thereby minimizing the entry of foreign substances and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bond face of the holder is increased to improve joining strength, then the reliability of the liquid discharge head improves, but foreign substances are more likely to enter the bond face causing deterioration and crosstalk
Solution Approach 1:
The bond face is divided into multiple separate joint regions (first joint and second joints) rather than a continuous large bond face. This segmentation reduces the total area where foreign substances can enter while maintaining sufficient joining strength through distributed connection points between the diaphragm and holder.
Solution Approach 2:
The joint structure is designed with different joint regions at different locations (peripheral first joint and internal second joints) to optimize both structural support and contamination prevention. The non-contact area between joints further localizes the bonding to specific regions, reducing overall exposure to foreign substances.
2Ease of manufacture
If the joint structure is simplified to reduce manufacturing complexity, then the ease of manufacture improves, but the ability to prevent foreign substance entry and crosstalk deteriorates
Solution Approach 1:
The joint structure uses multiple discrete joint regions that can be independently formed and assembled, simplifying the manufacturing process compared to creating a complex continuous bond pattern. The segmented design allows for easier alignment and assembly while effectively preventing crosstalk through the non-contact areas between joints.
3Reliability
If the non-contact area is increased to reduce crosstalk and foreign substance entry, then the reliability improves, but the structural support and stability of the diaphragm may deteriorate
Solution Approach 1:
The holder supports the diaphragm through multiple segmented joint regions distributed across the structure. This segmentation provides adequate structural support and stability while maintaining non-contact areas that prevent crosstalk and foreign substance entry. The distributed support points ensure the diaphragm remains stable without requiring a continuous bond face.
Solution Approach 2:
The joint structure extends in multiple spatial dimensions with the first joint at the periphery and second joints internally positioned, creating a three-dimensional support architecture. This multi-dimensional arrangement provides comprehensive structural support while maximizing non-contact areas for crosstalk prevention.
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 design significantly reduces the deterioration of the liquid discharge head by preventing foreign substance entry and enhancing the field rate, while also reducing crosstalk between actuators.
Implementation Method 1
a piezoelectric element on the actuator substrate; the piezoelectric element to deform the diaphragm
Data Source
AI summary
A liquid discharge head includes: a nozzle plate having multiple nozzles; a diaphragm facing an inner face of the nozzle plate; multiple individual chambers between the nozzle plate and the diaphragm, the multiple individual chambers respectively communicating with the multiple nozzles; multiple actuators on a first face of the diaphragm opposite to a second face of the diaphragm facing the multiple individual chambers, the multiple actuators to deform the diaphragm to discharges a liquid in the multiple individual chambers from the multiple nozzles, respectively; a holder facing the multiple actuators and the diaphragm and joined to a peripheral portion of the diaphragm; a first joint at a first position around a periphery of the holder and joining the diaphragm and the holder; and multiple second joints joining the diaphragm and the holder at multiple second positions inside the first position, respectively.