Ink Ejection Head Signal Power Wiring Noise Isolation
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Solution Overview
Problem
High-speed liquid ejection heads face noise interference issues due to high clock frequencies, which disturb control signal waveforms and potentially affect liquid discharge, especially when high electric potential wiring lines are nearby.
Innovation Solution
The liquid ejection head design includes an integrated circuit board and an electrical wiring board with signal and power input sections positioned on opposite sides relative to the center line, orthogonal to the wiring board's longitudinal direction, to separate low and high potential electrical signals and reduce noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If clock frequency is increased to achieve higher speed liquid ejection, then productivity is improved, but control signals become more susceptible to noise interference
Solution Approach 1:
The electrical wiring board is segmented into distinct regions: a signal input section for control signals and a power input section for high electric potential signals. These sections are positioned on opposite sides of the board relative to a center line, physically separating low-potential signal paths from high-potential power paths to prevent noise coupling.
2Device complexity
If high electric potential wiring lines are placed in the vicinity of control signal lines, then device complexity is reduced, but signal waveform is disturbed
Solution Approach 1:
The high electric potential power input section is extracted and positioned separately from the signal input section on the electrical wiring board. This spatial separation removes the harmful electromagnetic interference from the vicinity of control signal lines, eliminating noise coupling while maintaining a compact overall device structure.
Data Source
AI summary
A liquid ejection head includes an element substrate for ejecting a liquid, an integrated circuit board outputting a control signal for controlling the element substrate, and an electrical wiring board connected electrically to the element substrate. The electrical wiring board has a signal line connector to which control signals are inputted and electrical wiring board connectors to which an electric signal for driving the liquid ejection head is inputted. The signal line connector and the electrical wiring board connectors are disposed on opposite sides to each other relative to a center line extending orthogonally to a longitudinal direction of the electrical wiring board.