Thin-Film Heater Assembly With Track-Overlapping Temperature Sensor
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Solution Overview
Problem
Conventional thin film heaters in aerosol generating devices lack accurate and reliable temperature monitoring, leading to inconsistent heating performance due to variable sensor positioning and averaging temperature readings across the heater assembly.
Innovation Solution
A heater assembly design where a temperature sensor is positioned to overlap with a portion of the heating element track, allowing for precise local temperature measurement and consistent positioning, enhancing accuracy and reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a temperature sensor is mounted within a thin film heater using conventional methods, then the heater assembly can be fabricated, but the temperature sensor positioning varies across devices leading to inconsistent heating performance
Solution Approach 1:
The temperature sensor is pre-positioned on the heating element track before the thin film heater is assembled and sealed. This preliminary positioning ensures consistent sensor location relative to the heating element across all devices, eliminating the variability that occurs when sensors are mounted after assembly. The sensor is placed at a specific location on the heating element track, which is then encapsulated within the sealed thin film envelope, maintaining its precise position during subsequent manufacturing steps.
2Measurement precision
If conventional temperature sensing methods are used, then the heater assembly can operate, but the temperature readings lack accuracy and reliability for precise temperature control
Solution Approach 1:
The temperature sensor is positioned to measure the local temperature at a specific location on the heating element track, rather than attempting to measure an average temperature across the entire heating area. This localized measurement approach provides more accurate and reliable temperature data for control purposes, as it directly monitors the temperature at the heating element itself where the measurement is most critical for preventing overheating and ensuring consistent vaporization.
3Measurement precision
If the temperature sensor measures average temperature across the heating area, then the measurement covers the entire heating zone, but localized overheating cannot be detected or prevented
Solution Approach 1:
The temperature sensor is positioned to measure the local temperature at a specific location on the heating element track, providing localized temperature monitoring. This enables the detection of hot spots and localized overheating conditions that would be averaged out in a distributed measurement approach. By monitoring the temperature at the heating element itself, the system can identify and respond to localized temperature excursions before they cause harmful effects.
4Measurement precision
If additional components are added to improve temperature sensing, then measurement accuracy may improve, but the assembly procedure becomes more complex
Solution Approach 1:
The temperature sensor is integrated into the heating element structure itself, with the sensor positioned on the heating element track before the thin film heater is sealed. This merging of the sensing function with the heating element structure eliminates the need for separate mounting steps and reduces assembly complexity. The sensor becomes an inherent part of the heating assembly rather than an add-on component, simplifying both manufacturing and assembly procedures while maintaining measurement accuracy.
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 provides more accurate temperature control, preventing localized overheating and ensuring consistent heating performance across devices by directly measuring the temperature of the heating element, thereby improving the efficiency and reliability of aerosol generation.
Implementation Method 1
a flexible thin film heater comprising a heating element track supported on a surface of a flexible electrically insulating backing film
Implementation Method 2
the temperature sensing element is positioned so as to overlap with a portion of heating element track
Data Source
AI summary
A heater assembly for an aerosol generating device includes a tubular heating chamber and a flexible thin film heater comprising a heating element track supported on a surface of a flexible electrically insulating backing film. The flexible thin film heater is wrapped around an outer surface of the heating chamber with the backing film toward the heating chamber. The invention further includes a temperature sensor comprising a temperature sensing element configured to sense a local temperature, wherein the temperature sensing element is positioned so as to overlap with a portion of heating element track. Because the temperature sensing element overlaps with a portion of the heating element track, the temperature sensor provides a more accurate reading of the temperature of the heating element itself.