Capacitance Skin Contact Sensing for Burn-Safe Cosmetic RF Treatment
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Solution Overview
Problem
Home-use cosmetic procedure devices risk applying excessive high-frequency stimulation and causing burns due to improper contact with the skin, necessitating a non-contact detection method to ensure safe operation.
Innovation Solution
A cosmetic procedure device equipped with a non-contact detection sensor that measures capacitance changes to determine skin contact, using a sensor unit comprising first and second electrodes and a support portion with temperature sensing capabilities, to prevent excessive stimulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-frequency energy is applied to the skin for cosmetic procedures, then the treatment effectiveness is improved, but the risk of burns increases when contact area is reduced
Solution Approach 1:
The capacitance sensor detects skin contact before high-frequency energy is applied. The control unit receives the detection signal and only enables the high-frequency generator when proper contact is confirmed, preventing burns before they can occur
Solution Approach 2:
The sensor unit continuously monitors skin contact status and provides feedback to the control unit. The control unit adjusts the high-frequency energy application based on this feedback, maintaining safe operation while ensuring effective treatment
2Reliability
If non-contact detection sensor is added to detect skin contact, then safety is improved, but device complexity increases
Solution Approach 1:
The sensor unit serves multiple functions: it detects skin contact presence, measures contact area through capacitance changes, and provides signals for control unit decision-making. This multi-functionality reduces the need for separate sensors for each function
Solution Approach 2:
The control unit acts as an intermediary between the sensor unit and the high-frequency generator. It processes the capacitance detection signals and controls the energy application, simplifying the overall system architecture by centralizing the control logic
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 device ensures safe application of high-frequency stimulation by detecting proper skin contact, preventing burns and discomfort through precise temperature and capacitance measurement.
Implementation Method 1
a sensor unit sensing a state in which the user's skin is in contact with the stimulation application unit by detecting a change in capacitance
Implementation Method 2
a temperature sensor configured to measure the temperature of the procedure space
Data Source
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AI summary
A cosmetic procedure device is disclosed. A cosmetic procedure device, according to one aspect of the present invention, for performing a cosmetic procedure on the skin of a user may comprise: a main body; a procedure unit which is provided in the main body, and which has, therein, a procedure space in which the skin of the user undergoes a procedure; a stimulation application unit which is disposed in the procedure space, and which applies stimulation to the skin of the user; and a sensor unit which is disposed in the procedure unit, and which detects changes in capacitance so as to sense when the skin of the user is in contact with the stimulation application unit.