Piezoelectric Liquid Ejecting Head Vibration Absorption
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Solution Overview
Problem
Existing liquid ejecting heads have low absorption efficiency of liquid vibration due to the separation of pressure and liquid storage chambers, affecting the stability of ink ejection, and there is a need for a simple method to detect pressure near the pressure chamber.
Innovation Solution
A liquid ejecting head design with a pressure chamber and an adjacent absorption chamber, where a first piezoelectric member applies pressure and a second piezoelectric member detects pressure changes in the absorption chamber using electrostatic capacitance, allowing for efficient vibration absorption and pressure detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the liquid storage chamber is provided at a position spaced apart from the pressure chamber through many members, then the structure is stable and easy to manufacture, but the absorption efficiency of liquid vibration is low
Solution Approach 1:
The patent merges the pressure chamber and liquid storage chamber into a single integrated chamber structure, eliminating the need for multiple separating members. This integration allows the chamber to function both as a pressure application space and as a vibration absorption space, thereby improving absorption efficiency while maintaining manufacturing simplicity.
Solution Approach 2:
The chamber is designed to serve multiple functions simultaneously: it acts as both the pressure chamber for ink ejection and the liquid storage chamber for vibration absorption. This multi-functionality resolves the contradiction by eliminating the need for separate chambers and members, thereby improving absorption efficiency without compromising manufacturing ease.
2Reliability
If the liquid storage chamber is provided at the adjacent position of the pressure chamber, then the absorption efficiency of liquid vibration is improved, but the device complexity increases
Solution Approach 1:
The patent combines the pressure chamber and liquid storage chamber into one integrated chamber, eliminating the need for additional members and complex configurations. This merging approach improves absorption efficiency while actually simplifying the device structure compared to having separate adjacent chambers.
Solution Approach 2:
The single chamber performs both pressure application and vibration absorption functions, eliminating the need for complex multi-chamber configurations. This multi-functional design improves absorption efficiency while reducing device complexity.
3Measurement precision
If a separate pressure detection device is added to detect pressure near the pressure chamber, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The piezoelectric element serves dual functions: it acts as the drive element to generate pressure in the pressure chamber and simultaneously functions as a sensor to detect the pressure. This eliminates the need for separate pressure detection devices, thereby maintaining measurement precision while reducing device complexity.
Solution Approach 2:
The drive element (piezoelectric element) performs self-diagnosis by detecting the pressure it generates. This self-service capability allows for accurate pressure measurement without requiring additional external sensors or detection systems.
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 absorption efficiency of liquid vibration, stabilizes ink ejection, and enables effective pressure detection in the vicinity of the pressure chamber, improving the overall performance and quality of the liquid ejecting head.
Implementation Method 1
a first piezoelectric member that is provided corresponding to the pressure chamber and applies pressure to the pressure chamber when a voltage is applied
Implementation Method 2
an absorption chamber that is adjacent to the pressure chamber and absorbs vibration of the liquid generated when the pressure is applied to the liquid in the pressure chamber
Implementation Method 3
a second piezoelectric member that is provided corresponding to the absorption chamber, and a pressure acquisition portion that acquires pressure of the absorption chamber based on a voltage applied to the second piezoelectric member
Data Source
AI summary
A liquid ejecting head includes a nozzle substrate that is provided with a nozzle for ejecting a liquid, a pressure chamber substrate that includes a pressure chamber in which pressure for ejecting the liquid from the nozzle is applied to the liquid, and an absorption chamber that is adjacent to the pressure chamber and absorbs vibration of the liquid generated when the pressure is applied to the liquid in the pressure chamber, a first piezoelectric member that is provided corresponding to the pressure chamber and applies pressure to the pressure chamber when a voltage is applied, a second piezoelectric member that is provided corresponding to the absorption chamber, and a pressure acquisition portion that acquires pressure of the absorption chamber based on a voltage applied to the second piezoelectric member.