Head Driving Device Corrects Drive Waveforms for Stable Droplet Discharge
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Solution Overview
Problem
Existing droplet discharge systems face challenges in stabilizing discharge characteristics across different droplet sizes, leading to potential abnormalities in inkjet printing due to variations in drive waveforms and intermediate potentials.
Innovation Solution
A head driving device incorporating a drive circuit, first and second drive waveform generation circuits, and a correction circuit to generate and correct drive waveforms based on an intermediate potential, ensuring stable droplet discharge by adjusting drive signals for fine, medium, and large droplets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple drive waveforms are used to discharge different droplet sizes, then droplet discharge capability is improved, but discharge characteristics become unstable due to variations in intermediate potential
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the intermediate potential level of drive waveforms based on droplet size requirements. Different droplet sizes (fine, medium, large) use different intermediate potential levels, which are optimized to ensure stable discharge characteristics for each droplet type. This resolves the contradiction by making the intermediate potential a variable parameter rather than a fixed value.
Solution Approach 2:
The patent implements local quality by tailoring the intermediate potential of each drive waveform to the specific droplet size being discharged. Each droplet size category (fine, medium, large) receives a customized drive waveform with an optimized intermediate potential level, rather than using a uniform intermediate potential for all droplet sizes. This localized optimization ensures stable discharge characteristics across different droplet types.
2Reliability
If intermediate potential is adjusted to stabilize discharge characteristics, then droplet discharge stability is improved, but drive waveform complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing optimized drive waveforms with appropriate intermediate potentials for different droplet sizes. The drive waveform generation unit selects and outputs the pre-prepared waveform corresponding to the desired droplet size, rather than calculating waveforms in real-time. This approach stabilizes discharge characteristics while avoiding the complexity of real-time waveform computation.
Solution Approach 2:
The patent implements dynamics by making the intermediate potential adaptable based on the selected droplet size. The drive waveform generation unit dynamically switches between different intermediate potential levels corresponding to different droplet size categories. This dynamic adjustment stabilizes discharge characteristics for each droplet type without requiring a single complex fixed waveform.
Data Source
AI summary
There is provided a head driving device for causing a head to discharge droplets. The device includes a drive circuit, a first drive waveform generation circuit, a second drive waveform generation circuit, and a correction circuit. The drive circuit is configured to drive the head based on a plurality of drive waveforms to discharge the droplets. The first drive waveform generation circuit configured to generate a first drive waveform of the plurality of drive waveforms. The second drive waveform generation circuit is configured to generate a second drive waveform of the plurality of drive waveforms. The correction circuit is configured to correct the first drive waveform and the second drive waveform with reference to an intermediate potential.