Semiconductor Inhaler Heater With Flow Channels for Uniform Evaporation
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Solution Overview
Problem
Existing heaters for electronic cigarette products, particularly those using metal coil or MEMS technology, face issues such as 'dry puff' leading to damage, harmful component release, uneven heating, and inadequate temperature control, resulting in explosive splashes and contamination of the aerosol.
Innovation Solution
A method for producing a planar heater using a metal-free semiconductor material with integrated channels, employing a negative temperature coefficient (NTC) material to ensure uniform and controlled heating, and incorporating a flow control layer for precise liquid management and evaporation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If metal coil heaters or MEMS heaters are used for evaporating liquid, then heating function is achieved, but harmful metal components may be released and catalytic effects may contaminate the vapor or aerosol
Solution Approach 1:
The invention extracts and removes metallic components from the heating element structure. The heating element is constructed entirely from semiconductor materials (silicon substrate, polysilicon heating layers, doped regions) without any metal parts that could contact the liquid or vapor, thereby eliminating the source of metal component release and harmful catalytic effects while maintaining the heating function.
Solution Approach 2:
The invention employs composite semiconductor material structures consisting of silicon substrate with integrated polysilicon heating layers and doped regions. This composite semiconductor structure replaces traditional metal coil or metallic MEMS heater compositions, providing both heating functionality and elimination of metal-related harmful effects through the use of metal-free semiconductor materials throughout the heating element.
2Ease of manufacture
If simple metal coil heaters are used, then manufacturing is simple, but heating uniformity is poor and dry puff damage occurs
Solution Approach 1:
The heating element is segmented into multiple doped regions (n-type and p-type) distributed across the silicon substrate, creating multiple localized heating zones rather than a single metal coil. This segmentation allows for more uniform heat distribution across the heating surface and prevents localized overheating that causes dry puff damage, while still maintaining manufacturing simplicity through standard semiconductor fabrication processes.
Solution Approach 2:
The invention changes the fundamental material parameter from metallic to semiconductor-based heating elements. Semiconductor materials provide superior temperature control characteristics, including lower operating temperatures and more uniform heat distribution compared to metal coils. The doped semiconductor regions enable precise electrical control of heating parameters, eliminating dry puff damage while maintaining ease of manufacture through established semiconductor manufacturing techniques.
3Ease of operation
If metal components are used in the heater, then electrical control is achieved, but temperature distribution becomes uneven and hot spots form
Solution Approach 1:
The heating element incorporates locally differentiated doped regions (n-type and p-type) at specific positions on the silicon substrate. Each doped region serves as a localized heating zone with tailored electrical and thermal properties. This local quality variation enables precise electrical control of temperature at different locations, eliminating hot spots and achieving uniform temperature distribution across the entire heating surface while maintaining excellent electrical control capability.
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 prevents harmful metal component release, achieves uniform and precise temperature control, and ensures safe and efficient evaporation of liquids, reducing the risk of overheating and contamination while maintaining high evaporation performance.
Implementation Method 1
the radiator can consist of or be manufactured from a material having a negative temperature coefficient (NTC) - at least in one operating range, for example between 100 °C and 240 °C - i.e. the electrical resistance of the radiator decreases with increasing temperature
Implementation Method 2
Due to this characteristic, poorly cooled areas exhibit lower resistance and thus reduced heating performance
Implementation Method 3
a plurality of channels are incorporated into the semiconductor material essentially in the direction of the surface normal of the plate-like semiconductor material, such that a fluid can be passed through the semiconductor material in the channels
Data Source
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AI summary
The invention relates to a method for manufacturing an electrically operable heating element for an inhaler. According to said method, a semiconductor material (5) is provided in the form of a substantially flat element and a plurality of channels (8) are incorporated into the flat semiconductor material substantially in the direction of the surface normal of the flat semiconductor material such that a fluid can be passed through the channels of the semiconductor material.