Print Head Control Circuit Wiring for Signal Interference Reduction
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Solution Overview
Problem
In liquid discharge apparatuses like ink jet printers, discharge abnormalities in print heads can occur due to signal interference from multiple signal lines distributed in cables and connectors, leading to decreased ink discharge accuracy and image quality.
Innovation Solution
A print head control circuit with specific wiring configurations to minimize signal interference, including separate propagation wiring for diagnosis signals and driving signals, and strategically placing these wirings to reduce the likelihood of interference, ensuring proper operation and diagnosis of the print head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If multiple signal lines are distributed in a cable and connector for self-diagnosis, then the self-diagnosis function can be implemented, but signal interference occurs between high voltage driving signals and diagnosis signals
Solution Approach 1:
The patent divides the signal transmission paths into separate cables: one cable carries only high voltage driving signals, while another cable carries only diagnosis signals. This segmentation prevents signal interference by physically separating the two signal types that would otherwise share common transmission paths in conventional designs.
Solution Approach 2:
The patent introduces a signal isolation mechanism where diagnosis signals are transmitted through a separate cable that acts as an intermediary pathway, electrically isolated from the high voltage driving signal cable. This intermediary transmission path prevents direct interference while enabling the self-diagnosis function.
2Object-affected harmful factors
If separate cables are used for driving signals and diagnosis signals, then signal interference is reduced, but the device complexity increases
Solution Approach 1:
The patent designs the print head with integrated multi-functionality where the same housing and connector structures serve both signal transmission and mechanical mounting functions. The separated cable system is implemented within existing connector frameworks, allowing the system to maintain universal compatibility while reducing signal interference.
Solution Approach 2:
The patent resolves cable complexity by transitioning from a two-dimensional平面布局 (flat layout) to a three-dimensional spatial arrangement where cables are routed through different spatial paths and layers. This dimensional reorganization allows separate signal cables to coexist without excessive complexity in the connector interface.
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 signal interference, enhancing the accuracy of ink discharge and image quality by ensuring that diagnosis and driving signals are propagated with minimal disturbance, thus maintaining normal print head operation.
Implementation Method 1
A liquid discharge apparatus such as an ink jet printer forms characters or an image on a recording medium in a manner that the liquid discharge apparatus drives a piezoelectric element provided in a print head by a driving signal and thus discharges a liquid such as an ink with which a cavity is filled, from a nozzle
Data Source
AI summary
A print head control circuit controls an operation of a print head including a diagnosis circuit that diagnoses whether or not normal discharge of a liquid is possible. The print head control circuit includes a first cable including a first diagnosis signal propagation wiring for propagating a first diagnosis signal and a first driving signal propagation wiring for propagating a driving signal. A shortest distance between the first driving signal propagation wiring and the diagnosis circuit is longer than a shortest distance between the first diagnosis signal propagation wiring and the diagnosis circuit.