Covering Portion Shielding Electromagnetic Noise in Liquid Discharging Apparatus
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Solution Overview
Problem
High-speed printing applications face challenges in reducing electromagnetic wave noise radiation when transferring high-frequency signals to liquid discharging portions in printing apparatuses, which interferes with the printing process.
Innovation Solution
A liquid discharging apparatus design that includes a fixing portion, a circuit substrate, and a covering portion to shield electromagnetic wave noise, where the fixing portion and head cover are connected by the covering portion, preventing the area between them from functioning as an antenna, and at least one of the components is electrically grounded for improved shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency signals are transferred to the discharging portion for high-speed printing, then printing speed is improved, but electromagnetic wave noise radiation increases
Solution Approach 1:
The covering portion acts as an intermediary shielding element positioned between the circuit substrate and the discharging portion. It blocks the propagation path of electromagnetic waves generated by high-frequency signals, preventing them from radiating outward while allowing the high-speed printing operation to continue uninterrupted
Solution Approach 2:
The invention converts the harmful electromagnetic radiation into a contained field by using the covering portion as a shield. The electromagnetic energy that would otherwise radiate as noise is redirected and dissipated safely, transforming a harmful byproduct into a controlled phenomenon that does not interfere with the printing process
2Device complexity
If the space between fixing portion and head cover is left open for structural simplicity, then device complexity is reduced, but electromagnetic wave noise functions as an antenna
Solution Approach 1:
The covering portion serves as a mediating structure that fills the gap between the fixing portion and head cover. Rather than leaving the space open or creating a complex sealed structure, the covering portion provides a simple yet effective electromagnetic shield that prevents the gap from functioning as an antenna
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
The solution effectively reduces electromagnetic wave noise radiation, allowing for higher frequency signal transfer without interference, thus enhancing the printing speed and quality.
Implementation Method 1
a covering portion which connects the fixing portion and the head cover to each other, and covers a part between the fixing portion and the head cover... since the part between the fixing portion and the head cover does not function as an antenna, radiation of electromagnetic wave noise is reduced
Implementation Method 2
the discharging portion includes a piezoelectric element, such as a piezo element, and discharges a predetermined amount of ink at a predetermined timing from a nozzle as each of the piezoelectric elements are driven in accordance with the driving signal
Data Source
AI summary
There is provided a liquid discharging apparatus including: a discharging portion which discharges liquid; a fixing portion which fixes the discharging portion; a circuit substrate for controlling discharge of the liquid; a head cover which covers the circuit substrate; and a covering portion which connects the fixing portion and the head cover to each other, and covers a part between the fixing portion and the head cover.