Capacitive Ink Level Detection in Print Head Reservoirs
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Solution Overview
Problem
Ink jet printers lack effective methods to detect ink levels in reservoirs, leading to inconsistent ink supply and failure to notify users when ink levels reach a threshold, potentially causing interruptions in printing.
Innovation Solution
A print head ink supply system featuring first and second containers with capacitive sensors to detect ink levels, triggering refilling or notification when levels reach a predetermined threshold, ensuring continuous ink supply and preventing exhaustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ink level detection is not implemented, then the printing system operates without additional components, but ink supply consistency deteriorates and printing interruptions occur
Solution Approach 1:
The patent replaces complex mechanical level detection systems with capacitive sensing technology. The capacitive sensors detect ink levels through electrical field changes caused by the dielectric properties of ink, eliminating the need for mechanical float indicators or complex optical systems while maintaining reliable detection capability.
Solution Approach 2:
The capacitive sensors are integrated directly into the ink reservoir structure, allowing the reservoir itself to provide the sensing function. The sensors utilize the ink's inherent dielectric properties to generate detection signals, enabling the system to monitor its own state without external intervention or additional complex infrastructure.
2Measurement precision
If capacitive sensors are added to detect ink levels, then ink level monitoring reliability improves, but device complexity increases
Solution Approach 1:
The patent merges the capacitive sensors with the ink reservoir structure, integrating the sensing elements directly into the reservoir walls or bottom. This consolidation eliminates separate detection modules and reduces overall system complexity while maintaining precise measurement capabilities through the sensors' direct contact with the ink environment.
Solution Approach 2:
The capacitive sensors serve multiple functions: they detect ink level positions, determine ink volume remaining, and can potentially monitor ink properties through dielectric constant measurements. This multi-functionality reduces the need for separate detection systems for different parameters, thereby reducing overall device complexity while enhancing measurement precision.
3Reliability
If ink level threshold notifications are implemented, then printing interruption prevention improves, but system complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where capacitive sensors continuously monitor ink levels and provide real-time data to the printing system controller. When ink levels reach predetermined thresholds, the system automatically generates notifications or triggers refilling actions, creating a closed-loop control system that maintains printing continuity without requiring manual monitoring or complex automated refilling machinery.
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 system reliably monitors ink levels, ensuring uninterrupted printing by triggering refilling or notifications, thus maintaining a consistent ink supply and preventing waste.
Implementation Method 1
The level sensor includes a first capacitive sensor configured to output a first level signal indicative of a level of ink within the interior chamber of the first container
Data Source
AI summary
A print head ink supply includes first and second containers and a level sensor positioned between the first and second containers. The first and second containers are each configured to contain a volume of ink within an interior chamber. The level sensor includes a first capacitive sensor configured to output a first level signal indicative of a level of ink within the interior chamber of the first container, and a second capacitive sensor configured to output a second level signal indicative of a level of ink within the interior chamber of the second container.