Piezoelectric Inkjet Wiring Impedance for Residual Vibration Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid discharging apparatuses, such as ink jet printers, face discharge failures due to ink thickening, bubbles, and paper dust, which are not effectively detected by current methods, particularly in determining the electromotive force of piezoelectric elements with large amplitude driving signals.
Innovation Solution
A liquid discharging apparatus with a specific wiring configuration and transistor size optimization for the piezoelectric element, including a driving signal generating section, residual vibration detecting section, and selection section, where the second external wiring has a higher impedance and narrower line width than the first, functioning as a low-pass filter to accurately detect residual vibration while minimizing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a driving signal with large amplitude is supplied to the piezoelectric element, then the piezoelectric element can be effectively driven to discharge liquid, but the electromotive force generated by residual vibration has small amplitude and is difficult to detect
Solution Approach 1:
The patent divides the wiring into two separate external wirings: one for supplying the driving signal and another for extracting the electromotive force. This segmentation allows each wiring to be optimized for its specific function, with the second wiring designed to minimize interference and maximize detection sensitivity for the small amplitude electromotive force signal.
Solution Approach 2:
The patent applies different design characteristics to different parts of the wiring system. The second external wiring for electromotive force extraction is designed with specific impedance and physical characteristics (narrower line width) to optimize local signal detection quality, while the first wiring for driving signals can have different characteristics suited for power transmission.
2Object-affected harmful factors
If the second external wiring has higher impedance to reduce noise, then noise interference is minimized, but signal transmission efficiency may be reduced
Solution Approach 1:
The patent changes the impedance parameter of the second external wiring to be higher than that of the first wiring. This parameter change optimizes the wiring for its specific function of electromotive force extraction, where higher impedance helps filter noise while the wiring is designed with appropriate dimensions to maintain acceptable signal transmission.
3Object-affected harmful factors
If the second external wiring has narrower line width to increase impedance and filter noise, then noise reduction is achieved, but wiring complexity increases
Solution Approach 1:
The patent applies different line width characteristics to different wirings based on their specific functions. The second wiring has narrower line width optimized for electromotive force extraction and noise filtering, while the first wiring has broader line width suitable for driving signal transmission. This localized optimization achieves noise reduction without requiring the entire wiring system to be complex.
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 apparatus effectively detects residual vibration with high accuracy, reducing noise interference and maintaining the responsiveness of the piezoelectric element, enabling reliable ink discharge even in the presence of thickened ink, bubbles, or paper dust.
Implementation Method 1
a piezoelectric element which is provided in order to discharge liquid corresponding to the pressure chamber; a residual vibration detecting section which detects changes in electromotive force of the piezoelectric element in accordance with residual vibration inside the pressure chamber
Data Source
AI summary
An ink jet printer is provided with a driving signal generating section which generates a driving signal for driving a piezoelectric element, a residual vibration detecting section, a control IC which includes the residual vibration detecting section, and a connection terminal which connects the piezoelectric element, an input terminal to which the driving signal is supplied and an output terminal from which an output signal of the residual vibration detecting section is supplied, a first external wiring which is connected to the input terminal and through which the driving signal is supplied, and a second external wiring which is connected to the output terminal and through which the output signal of the residual vibration detecting section is supplied. A resistance value per unit length of the second external wiring is larger than a resistance value per unit length of the first external wiring.