Liquid Jet Head Thermal Conduction for Ink Temperature Detection
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Solution Overview
Problem
Existing liquid jet recording devices face challenges in accurately detecting the temperature of ink ejected from nozzle holes, which affects ejection speed due to viscosity changes, and current solutions may incur high costs or material limitations.
Innovation Solution
A liquid jet head with a flow channel member featuring a high heat conduction part and a temperature detection element attached to its outer surface, allowing for accurate temperature detection of ink without direct contact, using a thermistor and adhesives to enhance sensitivity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is placed in direct contact with ink to accurately detect temperature, then measurement precision is improved, but reliability deteriorates due to corrosion from ink contact
Solution Approach 1:
The patent introduces an ink contact member as an intermediary between the ink and the temperature sensor. This member has high heat conductivity to efficiently transfer temperature information while being corrosion-resistant to protect the sensor from direct ink contact, thus resolving the contradiction between accurate temperature detection and sensor durability
Solution Approach 2:
The ink contact member is made from a composite material or specific alloy that combines high heat conductivity with excellent corrosion resistance. This composite material property allows it to serve dual functions: efficiently conducting thermal energy from the ink while resisting degradation from prolonged ink exposure
2Reliability
If a temperature sensor is isolated from ink contact to prevent corrosion, then reliability is improved, but measurement precision deteriorates due to reduced heat conduction
Solution Approach 1:
The ink contact member serves as a thermal intermediary that bridges the gap between the isolated sensor and the ink. It maintains thermal coupling through high heat conductivity while providing physical isolation, allowing the sensor to be protected from corrosion without sacrificing temperature measurement accuracy
Solution Approach 2:
The ink contact member has differentiated local properties: its inner surface in contact with ink is optimized for corrosion resistance, while its material composition throughout is optimized for heat conduction. This local quality differentiation allows it to simultaneously satisfy both protection and thermal coupling requirements
3Measurement precision
If a high heat conduction material is used for the ink contact member, then measurement precision is improved, but manufacturing complexity increases due to material selection constraints
Solution Approach 1:
The use of composite materials or specially developed alloys for the ink contact member provides a practical solution that balances heat conduction requirements with manufacturing feasibility. These materials can be produced using standard manufacturing processes while achieving the necessary thermal and corrosion-resistant properties
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
Enables precise temperature management of ink, stabilizing ejection speed and quality while reducing costs and preventing corrosion, with improved sensitivity and freedom in material selection for the temperature detection system.
Implementation Method 1
a high heat conduction part; and a temperature detection element attached to an outer surface of the high heat conduction part
Data Source
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AI summary
A liquid jet head and a liquid jet recording device capable of accurately detecting the temperature of the ink are provided. A liquid jet head according to an embodiment of the disclosure includes a flow channel member(42a,42b) provided with a flow channel (440) of a liquid, and having a high heat conduction part (422) disposed so as to have contact with the liquid flowing inside the flow channel, and a low heat conduction part (421) having lower thermal conductivity than thermal conductivity of the high heat conduction part, a temperature detection element (43) disposed outside the flow channel, and attached to the high heat conduction part, and a liquid jet section (41,44) from which the liquid is jetted.