Housing-Integrated Touch Switch Sensing for Human Touch Identification
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Solution Overview
Problem
Existing mechanical switches in wearable devices are bulky, difficult to integrate into a seamless design, pose electric shock risks, and are challenging to dustproof and waterproof, while non-mechanical alternatives like touch-on-metal technology require significant space and may not effectively differentiate between human and non-human touch inputs.
Innovation Solution
A switching operation sensing apparatus with an input operation unit, oscillation circuit, frequency digital converter, and touch detection circuit, where the input operation unit is integrated with the housing, generating oscillation signals based on capacitive or inductive changes to differentiate between human and non-human touch inputs, and output corresponding touch detection signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical switches are used in wearable devices, then switching function is achieved, but device size increases and design becomes bulky
Solution Approach 1:
The patent replaces mechanical switches with a non-mechanical sensing system comprising an oscillation circuit, frequency digital converter, and touch detection circuit. The oscillation circuit generates oscillation signals that change frequency based on capacitive or inductive variations when touched, eliminating the need for mechanical moving parts while maintaining switching functionality.
Solution Approach 2:
The patent introduces a first switching member as an intermediary element that is integrally formed with the housing and serves as a touch interface. This member transfers touch inputs to the sensing circuitry without requiring direct mechanical contact with internal components, enabling a seamless design while preserving input functionality.
2Reliability
If mechanical switches are used, then switching operation is enabled, but integration into seamless design becomes difficult
Solution Approach 1:
The patent merges the first switching member with the housing by forming them as a single integral structure. This consolidation eliminates the need for separate switch components and simplifies the overall device architecture, making the switching function seamlessly integrated into the device casing.
Solution Approach 2:
The patent replaces the mechanical switch structure with an electrical sensing system that detects touch inputs through capacitive or inductive changes. This substitution eliminates complex mechanical assemblies and enables a cleaner, more integrated design while maintaining reliable switching operation.
3Ease of operation
If mechanical switches are used, then input function is provided, but electric shock risk increases
Solution Approach 1:
The patent introduces the first switching member as an intermediary between the user's touch and the internal circuitry. This member is integrally formed with the housing and serves as an isolated touch interface that prevents direct electrical contact with internal components, thereby eliminating electric shock risk while preserving input functionality.
Solution Approach 2:
The patent replaces direct mechanical and electrical contact switches with a non-contact sensing system. The oscillation circuit detects touch inputs through capacitive or inductive variations without requiring electrical connection to the touch interface, eliminating the electric shock hazard inherent in traditional mechanical switches.
4Reliability
If mechanical switches are used, then switching function is achieved, but dustproof and waterproof capability is reduced
Solution Approach 1:
The patent replaces mechanical switches with a sealed, non-mechanical sensing system. The oscillation circuit and associated components are integrated within the housing without requiring openings or gaps for mechanical movement, creating a dustproof and waterproof structure that maintains switching functionality through contactless detection.
Solution Approach 2:
The patent merges the switching function with the housing structure itself. The first switching member is integrally formed with the housing, eliminating separate components that would require interfaces or gaps. This integration enables the entire assembly to be sealed as a unified structure, providing inherent dustproof and waterproof protection.
5Reliability
If touch-on-metal technology is used, then non-mechanical switching is achieved, but space requirement increases
Solution Approach 1:
The patent makes the housing serve multiple functions: it provides structural support, acts as the first switching member for touch input, and serves as part of the sensing circuitry. This multi-functionality eliminates the need for separate switch components and reduces overall space requirements while maintaining non-mechanical switching capability.
Solution Approach 2:
The patent combines the housing structure with the switching and sensing functions. The first switching member is integrally formed with the housing, and the oscillation circuit uses the housing as part of its sensing structure. This merging of functions reduces the space required compared to dedicated touch-on-metal components.
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 enables a thinner, simpler, and more integrated design for wearable devices, effectively differentiates between human and non-human touch inputs, and provides dustproof and waterproof functionality, enhancing user safety and operational precision.
Implementation Method 1
an oscillation signal having a resonant frequency, varying based on a capacitive change or an inductive change, depending on a touch input member in contact with the first switching member
Implementation Method 2
an oscillation signal having a resonant frequency, varying based on a capacitive change or an inductive change, depending on a touch input member in contact with the first switching member
Implementation Method 3
The touch detection circuit is configured to detect capacitive sensing and inductive sensing based on a slope change of the count value
Implementation Method 4
The touch detection circuit is configured to detect capacitive sensing and inductive sensing based on a slope change of the count value
Data Source
AI summary
A switching operation sensing apparatus includes an input operation unit, an oscillation circuit, a frequency digital converter, and a touch detection circuit. The input operation unit includes a first switching member integrally formed with a housing. The oscillation circuit is configured to generate an oscillation signal having a resonant frequency, varying based on a capacitive change or an inductive change, depending on a touch input member in contact with the first switching member during an input operation. The frequency digital converter is configured to convert the oscillation signal into a count value. The touch detection circuit is configured to detect capacitive sensing and inductive sensing based on a slope change of the count value received from the frequency digital converter, and output corresponding touch detection signals of different levels based on the detection.