Liquid Ejecting Head Compliance Plate Vibration Isolation
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Solution Overview
Problem
Existing ink jet recording heads face challenges in securing sufficient compliance in the manifold while maintaining ink dispensing characteristics, as vibration from the compliance portion affects nozzle orifice direction and characteristics, and the compliance plate's thickness limitations hinder effective pressure fluctuation absorption.
Innovation Solution
A liquid ejecting head configuration with independently formed compliance and nozzle plates, where the compliance plate is thinner and includes through holes to reduce vibration propagation and enhance deformation, allowing for improved ink dispensing characteristics and temperature adjustment by exposing the compliance portion through the nozzle plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the compliance portion is formed on the nozzle plate, then the compliance function is integrated, but vibration propagates to the nozzle orifice affecting dispensing characteristics
Solution Approach 1:
The patent divides the compliance plate and nozzle plate into separate independent components. The compliance plate includes a flexible compliance portion that can deform to absorb pressure fluctuations, while the nozzle plate contains the nozzle orifices. By segmenting these functions into separate plates, vibration from the compliance portion does not propagate to the nozzle orifice, thus maintaining dispensing characteristics while providing compliance function.
2Stability of the object's composition
If the nozzle plate is made thinner to allow compliance function, then flexibility is improved, but the nozzle plate cannot sufficiently seal the manifold
Solution Approach 1:
The patent separates the sealing function (nozzle plate) from the compliance function (compliance plate). The nozzle plate can be made with appropriate thickness to ensure proper sealing of the manifold, while the separate compliance plate provides the necessary flexibility and deformation capability to absorb pressure fluctuations without compromising the sealing integrity.
3Reliability
If the compliance plate has sufficient thickness to form a recess, then compliance function is adequate, but the communication channel becomes long degrading high-frequency driving performance
Solution Approach 1:
The patent uses a thin flexible compliance plate with a recess to provide compliance function. The recess in the compliance plate creates a compliant chamber that can deform to absorb pressure fluctuations. By using a thin plate with a recess rather than a thick plate, the communication channel length is reduced, improving response speed for high-frequency driving while maintaining adequate compliance function through the recessed structure.
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 improves ink dispensing characteristics by reducing vibration impact and allowing full absorption of pressure fluctuations, while enabling rapid temperature adjustment of the ink, thus stabilizing the dispensing process and enhancing printing quality.
Implementation Method 1
an actuator unit that includes a piezoelectric element and a pressure chamber
Implementation Method 2
a flexible compliance portion formed in a region opposing the manifold... allowing pressure fluctuation inside the manifold to be sufficiently absorbed by the compliance portion
Data Source
AI summary
Provided is a liquid ejecting head, a liquid ejecting head unit, and a liquid ejecting apparatus are provided that can secure sufficient compliance in a manifold and prevent degradation in liquid dispensing characteristic. In the liquid ejecting head, a flow path plate including pressure chambers arranged in a row, a manifold plate including a manifold communicating with the pressure chambers, thus constituting a common liquid chamber, a compliance plate that seals the manifold, and a nozzle plate including a nozzle orifice communicating with the pressure chamber so as to eject a liquid, are stacked in this order. The compliance plate includes a flexible compliance portion formed in a region opposing the manifold, and the nozzle plate includes a through hole formed in a region opposing the compliance portion.