Inkjet Head Shielding for Static Noise Immunity
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Solution Overview
Problem
Inkjet recording heads are susceptible to noise from static electricity generated by friction between the conveying mechanism and recording medium, which can degrade image quality due to signal interference with the electric wiring substrate, especially in configurations with multiple wirings or close proximity to noise sources.
Innovation Solution
A liquid discharge head with a shield member having electric conductivity is used to shield the electric wiring substrate from noise sources, reducing the risk of static electricity discharge and maintaining image quality by positioning the shield member on the side surface of the recording head, excluding the discharge surface, and ensuring intimate contact with the electric wiring substrate to prevent charge invasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of recording elements is increased to improve image quality, then the image quality is improved, but the number of wirings in the electric wiring substrate increases, making the system more susceptible to noise
Solution Approach 1:
The patent divides the electric wiring substrate into multiple separate substrates, each handling a subset of the increased number of wirings. This segmentation isolates noise pathways and prevents cumulative noise effects from affecting all recording elements simultaneously, thus maintaining image quality while managing noise susceptibility in high-resolution configurations
Solution Approach 2:
The patent introduces a shielding structure as an intermediary between the electric wiring substrate and the recording element substrate. This shielding layer acts as a mediator that blocks electromagnetic noise from reaching the signal lines, allowing the system to accommodate more wirings without proportionally increasing noise susceptibility
2Volume of moving object
If the inkjet recording head is positioned close to the conveying mechanism to reduce apparatus size, then the apparatus size is reduced, but the risk of noise interference from static electricity increases
Solution Approach 1:
The patent introduces a shielding structure as an intermediary component positioned between the conveying mechanism and the electric wiring substrate. This shielding mediator blocks static electricity and electromagnetic noise from the conveying mechanism, allowing the recording head to be positioned close to the conveying mechanism for compact apparatus design while maintaining noise immunity
Solution Approach 2:
The patent employs a thin film-like shielding structure that can be positioned in close proximity to the recording elements without significantly increasing the overall apparatus volume. This flexible shielding film provides noise protection while maintaining the compact form factor required for close positioning of components
3Measurement precision
If multiple wirings are concentrated in the electric wiring substrate to support high-resolution recording, then the recording resolution is improved, but static electricity discharge generates more noise, degrading image quality
Solution Approach 1:
The patent segments the concentrated wirings into multiple separate electric wiring substrates, distributing the signal lines across multiple isolated pathways. This segmentation prevents noise from propagating across all recording elements and maintains reliable signal transmission even with the high wiring density required for high-resolution recording
Solution Approach 2:
The patent introduces a shielding structure as an intermediary layer between the multiple wirings and the recording element substrate. This shielding mediator blocks static electricity discharge and electromagnetic interference, ensuring that the concentrated wirings necessary for high-resolution recording do not compromise image quality stability
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 shielding configuration effectively disperses static electricity, reducing noise interference and maintaining image quality by preventing static discharge to the electric wiring substrate, thus ensuring accurate ink discharge and image fidelity.
Implementation Method 1
an shield member having electric conductivity and configured to shield the portion
Implementation Method 2
static electricity is discharged to the electric wiring substrate
Data Source
AI summary
A liquid discharge head includes a recording element substrate including a recording element that generates energy for discharging liquid from a discharge port, a base plate including a mounted surface on which the recording element substrate is mounted, an electric wiring substrate including a portion disposed on another surface of the base plate different from the mounted surface, adjacent to the mounted surface, and configured to be electrically connected to the recording element substrate, and an shield member having electric conductivity and configured to shield the portion.