Liquid Discharge Head Driving Circuit Oscillation Suppression
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Solution Overview
Problem
Long cables connecting liquid discharge devices to driving circuits can cause resonance due to parasitic capacitance and inductance, leading to unstable operation of liquid discharge devices, particularly noticeable as the cable length increases.
Innovation Solution
Incorporating a feedback loop with an oscillation suppression unit, such as a filter or inductive element, between the cable and the signal output unit to attenuate frequency components corresponding to the cable's inductance and capacitance, thereby suppressing oscillations and reducing resonance effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cable length connecting the liquid discharge head and the driving circuit is increased, then the ease of operation is improved, but the stability of the system deteriorates due to resonance caused by parasitic capacitance and inductance
Solution Approach 1:
The patent implements feedback control by detecting the actual driving signal from the cable and feeding it back to the driving circuit. This allows the system to monitor and compensate for oscillations caused by resonance, thereby maintaining stability even with longer cable lengths. The feedback mechanism enables real-time adjustment to counteract the harmful effects of parasitic capacitance and inductance.
Solution Approach 2:
The patent introduces an oscillation suppression unit as an intermediary component between the cable and the driving circuit. This unit acts as a mediator that filters out oscillations and resonance effects from the feedback signal, preventing them from destabilizing the system. The intermediary component isolates the driving circuit from the harmful electrical characteristics of long cables.
2Ease of operation
If the cable length is increased to improve ease of operation, then the device can be operated from a greater distance, but oscillation in the feedback signal increases due to resonance
Solution Approach 1:
The oscillation suppression unit serves as an intermediary that specifically targets and eliminates oscillations generated by the cable. It processes the feedback signal to remove resonant frequencies caused by parasitic capacitance and inductance, thereby preventing oscillation from propagating back to the driving circuit while allowing the cable to remain long for operational convenience.
Solution Approach 2:
The feedback control system continuously monitors the driving signal and adjusts the output to compensate for oscillations. By detecting oscillations in real-time and applying corrective feedback, the system can maintain stable operation even when long cables generate significant resonance, thus allowing ease of operation without sacrificing signal quality.
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 stabilizes the operation of liquid discharge devices by effectively reducing the influence of resonance in the cables, ensuring consistent performance even with longer cable lengths.
Implementation Method 1
there is a possibility that the driving signal fed back to the driving circuit oscillates, under influence of resonance caused by parasitic capacitance of the cable and parasitic inductance
Implementation Method 2
resonance caused by parasitic capacitance of the cable and parasitic inductance
Implementation Method 3
resonance caused by parasitic capacitance of the cable and parasitic inductance
Implementation Method 4
the feedback loop may include a filter, as the oscillation suppression unit, disposed between the cable and the signal output unit
Implementation Method 5
the oscillation suppression unit may include an inductive element connected between the cable and the feedback loop
Data Source
AI summary
There is provided a liquid discharge device including: a printing head; and a head driving circuit that is connected to the printing head via an FFC and outputs a driving signal, in which the driving circuit includes a signal output unit which outputs an analog signal, a transistor pair which is connected to the signal output unit and the FFC and driven with the analog signal output from the signal output unit to output the driving signal to the FFC, a return path which is connected to the FFC and feeds back the driving signal output from the transistor pair to the signal output unit, and an oscillation suppression unit which suppresses oscillation of input from the return path to the signal output unit.