Inductive Shaver Skin Capacitance Motor Activation
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Solution Overview
Problem
Long-term use of key switches and toggle switches in existing electric shavers leads to metal fatigue and loss of elasticity, resulting in unreliable power supply.
Innovation Solution
A shaving head assembly with a conductive path that includes a holder or cutters connected to a rotating cutter head, and a handle assembly with a circuit board that activates the motor upon receiving an inductive capacitor signal from human skin, ensuring reliable power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If key switch and toggle switch are used for power supply control, then the shaver can be operated, but the reliability deteriorates due to metal fatigue and loss of elasticity after long-term use
Solution Approach 1:
The patent replaces mechanical switches (key switch and toggle switch) with an inductive sensing system that detects human skin capacitance to activate the motor. This substitution eliminates mechanical contact components that suffer from metal fatigue and elasticity loss, thereby resolving the reliability issue while extending service life.
2Reliability
If inductive sensing system is implemented, then switch failure is prevented, but device complexity increases due to additional conductive paths and sensing components
Solution Approach 1:
The patent integrates the conductive path into existing structural components such as the holder, cutters, and head cover, which serve both their original mechanical functions and the new function of capacitance sensing. This multi-functionality approach adds sensing capability without significantly increasing overall device complexity.
Solution Approach 2:
The patent combines the sensing function with existing structural elements by making the holder, cutters, or head cover electrically connected to form part of the conductive path. This merging approach integrates the sensing system into the existing structure rather than adding separate components, thereby limiting complexity increase.
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 inductive shaver maintains reliable operation by using human skin capacitance to activate the motor, thereby extending the lifespan of the shaver and preventing switch failure.
Implementation Method 1
the first conductive path is configured for receiving a first inductive capacitor between the holder and the ground when the holder approaches or contacts human skin
Data Source
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AI summary
The present invention relates to the technical field of shaver, and more particularly to a shaving head assembly (100), a handle assembly (200), and an inductive shaver. The inductive shaver includes the shaving head assembly (100) and the handle assembly (200). The shaver is configured with the first conductive path (300), the first end of the first conductive path (300) is the holder (120) or the cutters (131) in the shaving head assembly (100), and the second end is connected to the circuit board assembly (210) in the handle assembly (200). When shaving, the holder (120) (or the cutters (131)) is arranged approaching the human skin (1) such as the chin and cheeks; because the human skin (1) has a certain electric charge, when the human skin (1) directly contacts or approaches the holder (120) (or the cutters (131)), the holder (120) (or the cutters (131)) will absorb human skin (1) capacitance formed between the approaching position and the ground, which is the first inductive capacitor (Cf1). When the circuit board assembly (210) receives the first inductive capacitor (Cf1), the motor (202) is activated to drive the rotating cutter head (132) in the cutting unit (130) to rotate, so as to achieve the purpose of inductive shaving and ensure long-term reliable use of the shaver.