Capacitive Input for Aerosol Heating Control Under Liquid Interference
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Solution Overview
Problem
Existing aerosol delivery devices, such as electronic cigarettes, face challenges in providing a user-friendly and efficient method to control heating elements and detect user inputs without physical contact, while ensuring reliable operation and safety features.
Innovation Solution
The integration of capacitive sensors with shield electrodes and guard sensors in the control body and cartridge of aerosol delivery devices, allowing for user input detection and control of heating elements without physical contact, along with safety features like power management and communication interfaces, enhances user interaction and device functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If capacitive sensors are used to detect user input without physical contact, then ease of operation is improved, but reliability is worsened due to interference from liquids
Solution Approach 1:
A shield electrode is introduced as an intermediary element between the capacitive sensor and the liquid environment. The shield electrode detects liquid presence and generates a signal that blocks or adjusts the capacitive sensor's operation when liquid is detected, thereby preventing false inputs while maintaining normal touch detection functionality
Solution Approach 2:
The system implements a feedback mechanism where the shield electrode continuously monitors for liquid presence and provides real-time feedback to the control component. When liquid is detected, the control component adjusts the capacitive sensor's sensitivity or disables it, creating a closed-loop system that adapts to environmental conditions and maintains reliability
2Reliability
If guard sensors are added to detect liquid levels, then reliability is improved by preventing false inputs, but device complexity increases
Solution Approach 1:
The shield electrode serves multiple functions: it acts as a liquid detection sensor (guard sensor), provides electromagnetic shielding for the capacitive sensor, and functions as part of the overall input detection system. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity while still achieving reliable liquid detection
3Reliability
If shield electrodes are used to attenuate liquid effects, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The shield electrode is designed to work in conjunction with the capacitive sensor in a complementary manner, where the capacitive sensor's inherent characteristics are utilized to enhance the shield's effectiveness. The system self-adjusts by using the interaction between the shield electrode and capacitive sensor fields to optimize liquid detection and shielding performance, reducing the need for high-precision manual positioning
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
This solution enables efficient vaporization of aerosol precursors, provides user-friendly operation, and ensures safety through capacitive sensing and power control, enhancing the overall user experience and device reliability.
Implementation Method 1
a heating element configured to activate and vaporize components of the aerosol precursor composition
Implementation Method 2
the capacitive sensor includes a first electrode configured to detect a change in capacitance in response to a user input
Implementation Method 3
the capacitive sensor includes a shield electrode configured to at least partially attenuate an effect of liquid on the capacitive sensor
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A control body (102) is coupled or coupleable with a cartridge (104) that is equipped with a heating element (222) and contains an aerosol precursor composition, the control body (102) and cartridge (104) forming an aerosol delivery device (100). The control body (102) includes a control component (208) to control the heating element (222) to activate and vaporize components of the aerosol precursor composition. An input device (248) including a capacitive sensor is configured to detect a user input. And the input device (248) or control component (208) controls operation of at least one functional element of the control body (102), cartridge (104) or aerosol delivery device in response to the user input so detected. In another aspect, a cartridge (104) may include a input device (252) including a capacitive sensor to detect a user input, and operation of functional element(s) may be controlled in response to thereto.