Liquid Jet Head Temperature Control via Sensor Feedback
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Solution Overview
Problem
Existing recording apparatuses face challenges in maintaining consistent liquid temperature within the recording head, leading to variations in viscosity and jet characteristics, which are difficult to address despite heating the supply pipe.
Innovation Solution
A recording apparatus with a liquid supply flow path, temperature sensors, and a heating unit, where the control unit adjusts the liquid flow and heating based on temperature differences detected by sensors to maintain consistent temperatures across the recording head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If liquid is heated in the supply pipe to maintain temperature, then liquid temperature outside the head is improved, but temperature variation inside the recording head persists
Solution Approach 1:
The patent applies local quality by placing temperature sensors and heating units at specific locations within the recording head rather than just in the supply pipe. The first temperature sensor is positioned in the first region of the supply and discharge flow path, the second temperature sensor in the second region, and heating units are strategically placed to locally heat liquid in specific areas, ensuring uniform temperature distribution throughout the head.
Solution Approach 2:
The patent implements feedback control by using temperature sensors to detect liquid temperature at different positions and adjusting heating unit operation accordingly. The control unit receives temperature data from multiple sensors and dynamically controls the heating units to maintain consistent temperature, creating a closed-loop system that responds to actual temperature conditions.
2Temperature
If heating unit is added to control temperature, then temperature stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the temperature control function into the existing liquid supply system by integrating heating units and temperature sensors directly into the supply and discharge flow path structure. This integration allows temperature control without adding separate external heating systems, reducing overall device complexity while maintaining effective temperature stability.
3Measurement precision
If multiple temperature sensors are placed in the head, then temperature detection precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the temperature monitoring function by placing multiple temperature sensors at different positions (first region and second region) along the supply and discharge flow path. This segmentation allows independent detection of temperature variations in different areas, providing comprehensive temperature monitoring while keeping each sensor's placement simple and functional.
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
Effectively stabilizes liquid temperature within the recording head, reducing viscosity variations and improving jet characteristics by actively managing temperature differences through controlled liquid flow and heating.
Implementation Method 1
a heating unit that heats the recording head
Implementation Method 2
while the warmed supply and discharge flow path is cooled, it is possible to solve variation in temperature of liquid in the flow path
Data Source
AI summary
A recording apparatus includes: a recording head that has: an inlet; an outlet; a supply and discharge flow path; a nozzle; and a liquid supply flow path, a liquid flow forming unit that forms a flow of liquid toward the outlet in the supply and discharge flow path; a first temperature sensor; a second temperature sensor; a heating unit; and a control unit that controls the liquid flow forming unit and the heating unit on the basis of a first detection temperature and a second detection temperature, wherein the first temperature sensor is disposed in a first position between the inlet and the communicating position of the liquid supply flow path, wherein the second temperature sensor is disposed in a second position between the outlet and the communicating position, wherein the heating unit is disposed in a third position between the inlet and the communicating position.