Ink Filling Control via Residual Vibration Detection
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Solution Overview
Problem
Existing liquid discharging apparatuses face challenges in accurately determining when to terminate the filling operation of ink in recording heads, leading to potential discharge failures due to insufficient or excessive ink levels, which vary with factors like liquid type and environmental temperature.
Innovation Solution
A liquid discharging apparatus equipped with a driving element, pressure chamber, driving circuit, detection circuit for residual vibration or temperature signals, and a control section that terminates the filling operation based on detected signals after the driving element is driven, ensuring precise ink filling without excess or deficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a predetermined wait time is used to determine when filling is complete, then the control is simple, but the filling precision deteriorates due to variable filling times
Solution Approach 1:
The patent employs a detection circuit to monitor residual vibration in the pressure chamber and provides real-time feedback to the control circuit. When vibration falls below a threshold, the control circuit terminates filling, replacing fixed-time control with dynamic feedback-based decision making to achieve precise filling without excessive complexity
2Productivity
If filling continues until a fixed time, then the process is simple to control, but liquid may be unnecessarily discharged or discharge failure occurs
Solution Approach 1:
The detection circuit continuously monitors vibration levels in the pressure chamber and feeds this information back to the control circuit. The control circuit terminates filling when vibration indicates sufficient liquid level, preventing both discharge failure (insufficient liquid) and unnecessary discharge (excessive liquid), thereby ensuring reliability while maintaining efficiency
Data Source
AI summary
A liquid discharging apparatus has: a liquid discharging head that has a driving element and a pressure chamber in which liquid is pressurized when the driving element is driven; a driving circuit that drives the driving element; a detection circuit that detects a signal related to residual vibration in the pressure chamber; and a control section that controls a filling operation to supply liquid from the outside into the liquid discharging head. The control section terminates the filling operation according to a signal detected by the detection circuit after the driving element is driven by the driving circuit.