Inkjet Head Drive Waveforms for Fine Droplet Volume Control

The patent segments the ejection control into two independent components: drop number control (coarse adjustment) and pulse width control (fine adjustment). This segmentation allows the system to achieve fine ejection volume control through pulse width modulation without increasing the complexity of drop number management, resolving the contradiction between adjustment precision and control complexity.

The patent introduces dynamic pulse width modulation as a flexible control parameter that can be adjusted independently for each nozzle. This dynamic adjustment capability enables continuous fine-tuning of ejection volume without discrete steps, overcoming the limitation of coarse adjustment while maintaining simple control logic through independent parameter management.

The patent applies local quality by allowing minute adjustment waveforms to be selectively applied only to specific nozzles that require fine adjustment, rather than uniformly to all nozzles. This selective application reduces the overall control data amount while maintaining high precision where needed, resolving the contradiction between control precision and data quantity.

The patent implements partial action by applying minute adjustment waveforms only to the extent necessary for achieving the desired print quality. Not all nozzles require fine adjustment, so this partial application approach achieves the required precision while minimizing the total control data amount generated.