Liquid Ejecting Head Wiring Substrate Sharing with Dummy Signals
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Solution Overview
Problem
In liquid ejecting apparatuses, the mixing of ejecting and non-ejecting units leads to issues with inappropriate signal transmission, resulting in erroneous ejection of ink, and existing configurations struggle to efficiently manage the sharing of wiring substrates between these units.
Innovation Solution
A liquid ejecting apparatus with a wiring substrate connected to electrodes, where a signal waveform is applied to both ejecting and non-ejecting units, using a dummy signal for non-ejecting units to prevent ink ejection, and a control unit that multiplexes data to ensure accurate signal application, allowing for shared wiring substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If ejecting units and non-ejecting units are mixed in the liquid ejecting head, then device complexity is reduced and wiring substrate sharing is enabled, but erroneous ejection occurs due to inappropriate signal transmission
Solution Approach 1:
The patent applies local quality by differentiating signal treatment based on unit type: ejecting units receive normal driving signals while non-ejecting units receive dummy signals. This localized differentiation prevents erroneous ejection from non-ejecting units while maintaining the benefit of mixed configuration and wiring substrate sharing.
Solution Approach 2:
The control unit acts as an intermediary that receives printing data and selectively applies different signal waveforms to electrodes based on whether they correspond to ejecting or non-ejecting units. This intermediary function ensures appropriate signal transmission to each unit type, preventing erroneous ejection while enabling shared wiring substrate.
2Reliability
If dummy signals are applied to non-ejecting units, then erroneous ejection is prevented, but signal processing complexity increases
Solution Approach 1:
The patent segments the signal processing function by dividing electrodes into two groups: those corresponding to ejecting units and those corresponding to non-ejecting units. This segmentation allows the control unit to apply different signal waveforms (normal driving signals vs. dummy signals) to each group, preventing erroneous ejection while managing processing complexity through structured differentiation.
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 ensures appropriate signal application to corresponding electrodes, preventing erroneous ejection and allowing for efficient sharing of wiring substrates, even when ejecting and non-ejecting units are mixed, while maintaining high-resolution printing capabilities.
Implementation Method 1
a piezoelectric element (for example, piezo element) is used has been known. The piezoelectric element is provided so as to correspond to respective a plurality of nozzles in a liquid ejecting head, ejects a predetermined amount of ink from the nozzle at a predetermined timing by being respectively driven according to a driving signal
Data Source
AI summary
A liquid ejecting apparatus includes a wiring substrate; and a liquid ejecting head, in which the liquid ejecting head includes a plurality of electrodes, an ejecting unit, and a non-ejecting unit, the wiring substrate is connected to the plurality of electrodes, the ejecting unit includes a driven element which is displaced due to a signal waveform applied to an electrode which is provided so as to correspond to at least one of the plurality of electrodes, a pressure chamber, and nozzles, the non-ejecting unit is provided so as to correspond to at least another electrode among the plurality of electrodes, and does not include at least one of the nozzle, the driven element, and the pressure chamber, and the signal waveform which is applied to an electrode which corresponds to the non-ejecting unit is designated by a dummy signal in the printing data.