Aerosol Heater Activation Using Sequential Capacitive Contact Sensing
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Solution Overview
Problem
Aerosol generating devices are often activated unintentionally when a user contacts them, leading to unwanted heating, which is not specific to smoking intentions.
Innovation Solution
The device incorporates a capacitive sensor and a controller that activate the heater only when specific contact patterns are detected, distinguishing between holding and smoking actions by sensing contact through different conductive elements at distinct time points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capacitive sensor is used to detect user contact, then the device can distinguish between holding and smoking actions, but the device complexity increases due to additional conductive elements and control logic
Solution Approach 1:
The device divides the contact detection function into multiple conductive elements (first conductive element on housing, second conductive element on mouthpiece) that can be independently sensed. This segmentation allows the system to distinguish between different contact patterns (holding vs. smoking) by detecting which conductive element is contacted and when, thereby improving activation accuracy without requiring a single complex sensor.
Solution Approach 2:
The patent adds a temporal dimension to contact detection by comparing the timing of contact with different conductive elements. The controller determines activation based on whether contact with the second conductive element occurs after contact with the first conductive element. This temporal sequencing transforms a simple contact detection problem into a multi-dimensional discrimination problem, improving reliability while using relatively simple capacitive sensing components.
2Ease of operation
If the heater is activated on any user contact, then the device is easy to operate, but accidental heating occurs when the user merely holds the device
Solution Approach 1:
The system implements feedback by continuously monitoring contact status on multiple conductive elements and using this information to control heater activation. The controller receives feedback from the capacitive sensor about which conductive element is being contacted and when, then uses this feedback to make intelligent decisions about whether to activate the heater. This feedback mechanism prevents accidental heating while maintaining ease of operation for intended smoking actions.
Solution Approach 2:
The activation criterion is made dynamic rather than static. Instead of activating the heater on any contact event, the system dynamically evaluates the sequence and timing of contact events across different conductive elements. The activation condition changes based on the temporal relationship between contacts - only activating when contact with the mouthpiece occurs after contact with the housing, thereby preventing accidental activation while maintaining simplicity for proper use.
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
Ensures the aerosol generating device is activated only when the user intends to smoke, preventing accidental heating and optimizing the smoking experience.
Implementation Method 1
a capacitive sensor, wherein the controller controls power supplied from the battery to the heater based on an order of a first time point at which the capacitive sensor senses contact of a user through the first conductive element
Implementation Method 2
a heater... control power supplied from the battery to the heater
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An aerosol generating device includes a battery, a capacitive sensor, a controller, a first conductive element, a second conductive element, and a heater, wherein the controller is configured to control power supplied from the battery to the heater based on an order of a first time point at which the capacitive sensor senses contact of a user through the first conductive element and a second time point at which the capacitive sensor senses contact of the user through the second conductive element.