Liquid Ejecting Apparatus Driving Circuit Segmentation
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Solution Overview
Problem
Existing liquid ejecting apparatuses face reduced ink discharge speed due to dominant resistance components in wiring patterns and cables, which affects printing quality.
Innovation Solution
A liquid ejecting apparatus with a driving signal generating circuit and a reference voltage signal generating circuit, where the driving signal and reference voltage signal are propagated through separate wires, including a coil to minimize resistance and inductance components, ensuring efficient ink discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If inductance components of wiring pattern and cable are reduced, then signal propagation efficiency is improved, but resistance components become dominant and ink discharge speed is reduced
Solution Approach 1:
The patent divides the signal transmission path into two separate wires: one for the driving signal and another for the reference voltage signal. This segmentation allows independent optimization of each wire's characteristics, enabling the driving signal wire to minimize inductance while the reference voltage wire can be designed to balance resistance and inductance, thus resolving the contradiction between signal propagation efficiency and ink discharge speed.
Solution Approach 2:
The patent applies different design qualities to different parts of the wiring system. The driving signal wire is designed with minimal inductance characteristics for efficient signal propagation, while the reference voltage wire is designed with balanced resistance and inductance characteristics. This local differentiation of wire properties allows each to optimize its function, resolving the overall contradiction.
2Speed
If resistance components of wiring pattern and cable are minimized, then ink discharge speed is improved, but signal stability may be compromised
Solution Approach 1:
The reference voltage wire acts as an intermediary that provides a stable reference potential for the piezoelectric element. By separating this reference voltage transmission from the driving signal transmission, the system can minimize resistance in the driving signal path to improve discharge speed while maintaining signal stability through the dedicated reference voltage path with balanced characteristics.
Solution Approach 2:
The patent segments the electrical connection into two independent pathways: one for driving signals and another for reference voltage. This segmentation allows the driving signal path to be optimized for speed with minimal resistance, while the reference voltage path maintains stability through balanced resistance and inductance, resolving the contradiction between speed and reliability.
3Speed
If separate wires are used for driving signal and reference voltage signal, then resistance and inductance can be optimized independently, but device complexity increases
Solution Approach 1:
The patent combines the driving signal wire and reference voltage wire into a single integrated wiring structure where both functions are implemented. This merging approach allows independent optimization of resistance and inductance characteristics for each signal type while maintaining a compact overall structure, thus improving ink discharge speed without proportionally increasing 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
The solution enhances ink discharge speed and accuracy by balancing resistance and inductance components in the signal propagation paths, thereby improving printing quality.
Implementation Method 1
The piezoelectric element is provided in a print head (a liquid ejecting head) to correspond to a plurality of nozzles for discharging ink and a cavity for storing the ink discharged from the nozzles. Then, as the piezoelectric element is displaced according to a driving signal, a diaphragm provided between the piezoelectric element and the cavity is displaced. Accordingly, the internal volume of the cavity is changed, and the ink stored inside the cavity is discharged from the nozzle.
Implementation Method 2
the second wire is electrically coupled to the reference voltage signal generating circuit, and propagates the reference voltage signal to the other end through the coil
Data Source
AI summary
A liquid ejecting apparatus includes a liquid discharging head having a nozzle and a piezoelectric element, a driving signal generating circuit, a reference voltage signal generating circuit, a substrate on which the driving signal generating circuit and the reference voltage signal generating circuit are provided, a first wire, a second wire, and a coil, in which the driving signal generating circuit generates a driving signal, the reference voltage signal generating circuit generates a reference voltage signal, the piezoelectric element is driven based on the driving signal supplied to one end of the piezoelectric element and the reference voltage signal supplied to the other end of the piezoelectric element, the first wire propagates the driving signal to the one end, and the second wire propagates the reference voltage signal to the other end through the coil.