Inkjet Nozzle Drive Waveform Switching for Multi-Ink Precision
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Solution Overview
Problem
Existing drop-on-demand (DOD) inkjet devices face challenges in maintaining consistent ink delivery due to limited adjustability of drive waveforms, requiring on-site adjustments for different ink viscosities and surface tensions, and struggle with printing widths beyond 32 dots, leading to inefficiencies and precision issues.
Innovation Solution
A drive system incorporating pulse width modulators, waveform switching circuits, and drive circuits for precise control over nozzles, allowing independent adjustment of waveforms, including startup, holding, and release phases, with adaptable duty cycles to manage different inks and unclog nozzles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive voltage is factory-preset to ensure consistent ink delivery, then the reliability of inkjet operation is improved, but the adaptability to different ink specifications and operating conditions deteriorates
Solution Approach 1:
The patent implements dynamic adjustability of drive voltage through a voltage adjustment module, allowing the factory-preset reliable operation to be dynamically modified for different ink specifications. The system transitions from static factory-preset voltage to dynamic adjustable voltage, resolving the contradiction between reliability and adaptability.
Solution Approach 2:
The patent changes the electrical parameters (voltage and current) of the drive waveform through dedicated adjustment modules. By allowing independent adjustment of voltage and current parameters, the system can adapt to different ink viscosities and surface tensions while maintaining reliable operation, thus resolving the contradiction.
2Device complexity
If only drive time is adjustable for waveform setting, then the device complexity is reduced, but the manufacturing precision of inkjet printing deteriorates
Solution Approach 1:
The patent segments the waveform adjustment into three independent parameters: drive time, drive voltage, and drive current. Each parameter has its own adjustment module, allowing precise control of inkjet printing by independently optimizing each parameter rather than relying on a single drive time adjustment.
Solution Approach 2:
The system transitions from static single-parameter (drive time) adjustment to dynamic multi-parameter (time, voltage, current) adjustment. This enables precise control of ink droplet ejection while maintaining manageable device complexity through modular architecture.
3Adaptability or versatility
If back-and-forth printing is used to print wider characters, then the adaptability to different printing widths is improved, but the productivity deteriorates
Solution Approach 1:
The patent introduces a new dimension of control by enabling independent adjustment of drive voltage and current parameters. This allows the system to achieve wider printing capabilities through parameter optimization rather than mechanical back-and-forth movement, thereby improving printing efficiency while maintaining width adaptability.
4Adaptability or versatility
If repeated field adjustment is performed when inks are replaced, then the adaptability to different ink characteristics is improved, but the loss of time increases
Solution Approach 1:
The patent implements preliminary configuration capabilities where drive voltage and current parameters can be pre-set for different ink types. The system includes memory modules to store optimized parameter sets, allowing quick switching between ink types without repeated field adjustment, thus reducing time loss while maintaining adaptability.
Data Source
AI summary
The present disclosure pertains to an inkjet drive system comprising a plurality of pulse width modulators (PWMs), a plurality of waveform switching circuits, a plurality of drive circuits, a control signal output circuit, and a plurality of nozzle groups. Each PWM outputs a distinct pulse waveform and is connected to all waveform switching circuits. Each switching circuit, under control of the control signal output circuit, selects a PWM waveform and supplies it to its associated drive circuit, which actuates the corresponding nozzle. This configuration enables independent, precise nozzle control, energy-saving operation, rapid nozzle unclogging, and compatibility with various printing materials, offering broad applicability in inkjet devices.