Liquid Discharge Head Recess Structure for Bubble-Free Damping
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Solution Overview
Problem
Existing liquid discharge heads face issues with liquid vibration and air bubble entry into discharge ports, affecting recording quality and discharge performance.
Innovation Solution
A liquid discharge head design featuring a flexible member in the recessed portion above the liquid chamber to absorb vibration and prevent air bubbles from entering the discharge port, utilizing flexible members to deform and expel air bubbles during suction or pressurization operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a flexible member (damper) is provided in the liquid chamber to restrain liquid vibration, then liquid vibration is reduced, but air bubbles generated in the liquid chamber can enter the discharge port affecting discharge performance
Solution Approach 1:
The liquid chamber is segmented into two functional zones: a first liquid chamber for supplying liquid to the discharge port, and a second liquid chamber (recessed portion) that serves as an air bubble accommodation space. This segmentation prevents air bubbles from the supply chamber from entering the discharge port while maintaining vibration damping functionality.
Solution Approach 2:
The flexible member acts as an intermediary element that performs dual functions: it dampens liquid vibration in the first liquid chamber and simultaneously forms a boundary that directs air bubbles toward the second liquid chamber, preventing them from reaching the discharge port.
2Productivity
If multiple nozzles are formed or discharge interval is shortened for high-speed recording, then productivity is improved, but liquid vibration in the liquid chamber increases
Solution Approach 1:
A flexible member is introduced into the liquid chamber to act as a vibration-damping element. This flexible component absorbs and dissipates liquid vibrations caused by high-speed discharge operations, enabling stable recording quality at increased productivity.
3Reliability
If air bubbles are accommodated in the liquid chamber, then discharge port blockage is prevented, but liquid chamber space for liquid supply is reduced
Solution Approach 1:
The liquid chamber is divided into two distinct spaces: a first liquid chamber optimized for liquid supply to the discharge port, and a second liquid chamber (recessed portion) dedicated to air bubble accommodation. This segmentation allows both functions to operate simultaneously without compromising liquid supply volume or discharge performance.
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
The design effectively reduces liquid vibration and prevents air bubbles from entering the discharge port, maintaining stable discharge performance and recording quality.
Implementation Method 1
at least one of surfaces forming the recessed portion is formed of a flexible member configured to absorb vibration of liquid in the liquid chamber
Implementation Method 2
a flexible member configured to absorb vibration of liquid in the liquid chamber
Data Source
AI summary
A liquid discharge head includes an element substrate including an energy generation element configured to generate energy for discharging liquid from a discharge port, and a supporting member which supports the element substrate and in which a liquid chamber configured to supply liquid to the discharge port is formed, wherein a recessed portion communicating with the liquid chamber is formed at a position above the liquid chamber in a vertical direction in an orientation of the liquid discharge head when used, and wherein at least one of surfaces forming the recessed portion is formed of a flexible member configured to absorb vibration of liquid in the liquid chamber.