Manifold Liquid Chamber Design for Bubble Ejection and Crosstalk Suppression
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Solution Overview
Problem
The existing manifold designs for liquid discharge systems, particularly in inkjet recording apparatuses, face challenges with bubble entrapment and vibration-induced crosstalk due to their rectangular-parallelepiped shape, which can lead to poor discharge performance and increased costs from high-pressure resistant, thin-film dampers.
Innovation Solution
The design incorporates a trapezoidal-shaped liquid chamber with an elastic damper that widens from the upper end to the lower end, featuring multiple head couplers spaced apart to minimize crosstalk and a central tank coupler for efficient bubble ejection, reducing the area of the damper while maintaining effective vibration absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rectangular-parallelepiped shaped distribution tank is used, then the structure is simple and easy to manufacture, but bubble entrapment occurs and discharge performance deteriorates
Solution Approach 1:
The patent applies curvature by changing the liquid chamber shape from a rectangular parallelepiped to a truncated cone with a circular base. This curved geometry eliminates corner regions where bubbles tend to accumulate, enabling bubbles to be naturally ejected through the central tank coupler while maintaining simple manufacturing processes.
2Productivity
If the liquid chamber length is increased to improve bubble ejection, then bubble entrapment is reduced, but the device complexity increases
Solution Approach 1:
The patent employs asymmetry by designing the liquid chamber with a truncated conical shape rather than a symmetric rectangular form. The gradual widening from the tank coupler end toward the head couplers creates an asymmetric geometry that naturally guides bubbles toward the central ejection point while distributing liquid flow evenly to multiple heads.
Solution Approach 2:
The patent transitions from a two-dimensional rectangular plan view to a three-dimensional truncated conical structure. This dimensional change allows the liquid chamber to achieve effective bubble ejection through its geometric configuration rather than merely extending length, thereby improving bubble management without proportionally increasing device complexity.
3Reliability
If high-pressure resistant thin-film dampers are used, then vibration-induced crosstalk is suppressed, but manufacturing costs increase
Solution Approach 1:
The patent applies local quality by positioning the elastic damper specifically at the tank coupler location where vibration transmission is most critical, rather than uniformly distributing damping materials throughout the entire liquid chamber. This localized approach provides effective crosstalk suppression while minimizing the quantity and cost of damper material required.
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 bubble entrapment, suppresses crosstalk, and reduces the cost of the apparatus by minimizing the area and material usage of the elastic damper without compromising damping functionality.
Implementation Method 1
a liquid chamber (23) including an elastic damper (22)... configured to store a liquid... multiple head couplers (27, 37) on a lower end of the liquid chamber (23), the multiple couplers configured to be respectively coupled to multiple liquid discharge heads (221)
Implementation Method 2
A length of the liquid chamber (23) increases from the tank coupler (26, 36) on the upper end toward the multiple head couplers (27, 37) on the lower end of the liquid chamber (23)
Data Source
AI summary
A manifold includes: a liquid chamber including an elastic damper, the liquid chamber configured to store a liquid; multiple head couplers on a lower end of the liquid chamber, the multiple head couplers configured to be respectively coupled to multiple liquid discharge heads and spaced apart in a longitudinal direction of the liquid chamber; and a tank coupler on an upper end of the liquid chamber, the tank coupler configured to be coupled to a tank configured to store liquid to be supplied to or discharged from the manifold, wherein a length of the liquid chamber increases from the tank coupler on the upper end toward the multiple head couplers on the lower end of the liquid chamber.