Liquid Ejecting Head Asymmetric Compliance Substrates
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Solution Overview
Problem
Existing liquid ejecting heads face challenges in efficiently managing the vibration absorption for liquids flowing through supply and discharge flow channels, as the compliance substrates' sizes are not optimized for the differing flow rates, leading to inefficiencies and potential impact from crosstalk.
Innovation Solution
The liquid ejecting head incorporates supply-side and discharge-side compliance substrates of varying lengths, with the discharge-side compliance substrates being shorter or longer than the supply-side substrates, optimized to match the flow rates and inertance of the respective channels, thereby reducing crosstalk and enabling downsizing while maintaining compliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the supply-side compliance substrate and discharge-side compliance substrate have the same size, then the structure is simple and easy to manufacture, but the vibration absorption efficiency is insufficient due to different flow rates in supply and discharge channels
Solution Approach 1:
The patent applies local quality by making the supply-side compliance substrate and discharge-side compliance substrate have different sizes tailored to their respective flow channel requirements. The supply-side substrate has a first size matching the supply flow channel characteristics, while the discharge-side substrate has a second size matching the discharge flow channel characteristics, optimizing vibration absorption for each location's specific flow conditions
Solution Approach 2:
The patent segments the compliance substrate system into two independent substrates with different dimensions - a supply-side compliance substrate and a discharge-side compliance substrate. This segmentation allows each substrate to be independently optimized for its specific flow channel's vibration characteristics without compromising the other
2Reliability
If larger compliance substrates are used to improve vibration absorption, then vibration damping performance improves, but the device size increases and compactness deteriorates
Solution Approach 1:
The patent optimizes the size of each compliance substrate locally according to the specific vibration characteristics and flow rate of its associated flow channel, rather than using a uniformly large substrate. This ensures adequate vibration damping performance while avoiding unnecessary increase in overall device volume
Solution Approach 2:
The patent employs flexible diaphragms as compliance substrates that dynamically respond to pressure variations and vibrations in the flow channels. This dynamic compliance mechanism provides effective vibration damping without requiring large static structures, thus maintaining compact device dimensions
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 enhances the liquid ejecting head's performance by minimizing the impact of crosstalk, ensuring effective vibration absorption, and allowing for a more compact design by optimizing the length and compliability of the compliance substrates based on flow rates and inertance.
Implementation Method 1
a supply-side compliance substrate which is provided so as to face the supply flow channel and absorbs a vibration of the liquid in the supply flow channel
Implementation Method 2
a discharge-side compliance substrate which is provided so as to face the discharge flow channel and absorbs a vibration of the liquid in the discharge flow channel
Data Source
AI summary
A liquid ejecting head includes: a nozzle; a pressure chamber; a supply flow channel which is located on one side in a first direction relative to the pressure chamber and through which a liquid is supplied to the pressure chamber; a discharge flow channel which is located on another side in the first direction relative to the pressure chamber and through which the liquid is discharged from the pressure chamber; a supply-side compliance substrate which absorbs a vibration of the liquid in the supply flow channel; and a discharge-side compliance substrate which absorbs a vibration of the liquid in the discharge flow channel. A length of the discharge-side compliance substrate in the first direction is shorter than a length of the supply-side compliance substrate in the first direction.