Piezoelectric Liquid Ejecting Head Layout for Real-Time Vibration Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid ejecting heads face limitations in driving frequency and throughput due to the sharing of piezoelectric elements for both liquid ejection and residual vibration detection, leading to insufficient performance when real-time detection is required.
Innovation Solution
A configuration with separate piezoelectric elements for pressure application, residual vibration detection, and vibration absorption, along with optimized chamber arrangements and wiring, allowing for independent operation of these functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same piezoelectric element is used for both liquid ejection and residual vibration detection, then device complexity is reduced, but driving frequency and throughput are limited
Solution Approach 1:
The patent divides the piezoelectric element functions into separate components: a first piezoelectric element for liquid ejection and a second piezoelectric element for residual vibration detection. This segmentation allows each element to operate independently at its optimal frequency, with the ejection element driving at high frequency for throughput and the detection element capturing residual vibrations without interference, thereby resolving the contradiction between device simplicity and productivity
2Device complexity
If the same piezoelectric element is used for both liquid ejection and residual vibration detection, then device complexity is reduced, but driving frequency is limited
Solution Approach 1:
By segmenting the piezoelectric functions into separate elements, the ejection element can operate at high driving frequencies optimized for liquid ejection throughput, while the detection element captures residual vibrations at lower frequencies. This eliminates the frequency limitation imposed by shared elements, as each element is optimized for its specific function rather than being constrained by dual-purpose requirements
3Productivity
If separate piezoelectric elements are used for ejection and detection, then driving frequency and throughput are improved, but device complexity increases
Solution Approach 1:
The patent merges the separate piezoelectric elements into a single integrated structure where the first piezoelectric element for ejection and the second piezoelectric element for detection are positioned adjacent to each other within the same pressure chamber assembly. This merging approach enables independent high-frequency operation for both functions while minimizing the increase in device complexity through compact integration rather than complete separation
4Measurement precision
If separate piezoelectric elements are used for ejection and detection, then real-time detection capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the ejection and detection functions in an integrated pressure chamber assembly where the first piezoelectric element applies pressure for ejection and the second piezoelectric element simultaneously detects residual vibrations. This merged configuration enables real-time detection during ejection operations without requiring separate detection chambers or complex signal isolation systems, thus improving detection capability while limiting the increase in device complexity
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
Enhances driving frequency and throughput by enabling simultaneous liquid ejection and real-time residual vibration detection without interference, improving the overall performance of the liquid ejecting head.
Implementation Method 1
a first piezoelectric element, a second piezoelectric element, a third piezoelectric element, a pressure chamber that applies a pressure for ejecting a liquid from the nozzle by driving the first piezoelectric element
Implementation Method 2
a detection chamber in which the second piezoelectric element detects a residual vibration of the pressure applied in the pressure chamber
Implementation Method 3
an absorption chamber in which the third piezoelectric element absorbs a vibration of the pressure applied in the pressure chamber
Data Source
AI summary
A liquid ejecting head includes a nozzle, a pressure chamber that applies a pressure for ejecting a liquid from the nozzle by driving a first piezoelectric element, a detection chamber in which a second piezoelectric element detects a residual vibration of the pressure applied in the pressure chamber, an absorption chamber in which a third piezoelectric element absorbs a vibration of the pressure applied in the pressure chamber, and a wiring substrate that electrically couples to an outside of the liquid ejecting head. The first piezoelectric element of the liquid ejecting head is electrically coupled to the wiring substrate, the second piezoelectric element is electrically coupled to the wiring substrate, and the third piezoelectric element, the first piezoelectric element, the wiring substrate, and the second piezoelectric element are disposed side by side in this order, when viewed from an up and down direction.