Touch Sensing Device with Reference Coil for Malfunction Prevention
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Solution Overview
Problem
Conventional mechanical switches in wearable devices are bulky, prone to electrical shocks, and difficult to dustproof and waterproof, with issues of noise and deteriorated touch detection performance due to external factors like temperature.
Innovation Solution
A touch sensing device with nonconductive cover and conductive frame, incorporating sensing electrodes and inductors, along with a reference coil and shielding member, to detect touches and pressures while blocking external influences and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional mechanical switch is used, then the switch function is implemented, but the device size increases and the design becomes less neat
Solution Approach 1:
The patent replaces the conventional mechanical switch with a touch sensing mechanism that detects touches through capacitance or force sensing. This eliminates the need for mechanical moving parts, reducing device volume while maintaining the switch function. The touch sensing portion is integrated into the cover or frame, allowing for a more compact and neat design.
Solution Approach 2:
The patent uses a touch-sensitive cover or frame structure where the touch sensing portion is integrated into the external casing. This allows the switch function to be implemented within the existing structural elements, eliminating the need for additional mechanical switch components and reducing overall device volume.
2Ease of manufacture
If a mechanical switch is used, then the switch function is provided, but the risk of electric shocks increases
Solution Approach 1:
The patent replaces mechanical switches with touch sensing mechanisms that detect touches through capacitance changes or force sensing without requiring direct electrical contact. The touch sensing portion is electrically isolated from the user through nonconductive cover materials, eliminating the risk of electric shocks while maintaining switch functionality.
Solution Approach 2:
The patent introduces a nonconductive cover or protective layer as an intermediary between the user's touch and the internal electrical components. This mediator allows touch detection while preventing direct electrical contact, thereby eliminating electric shock risks.
3Ease of manufacture
If a mechanical switch is used, then the switch function is implemented, but dustproofing and waterproofing become difficult
Solution Approach 1:
The patent replaces mechanical switches with touch sensing mechanisms that have no moving parts or openings. The touch sensing portion is integrated into the sealed cover or frame structure, allowing the entire assembly to be dustproof and waterproof without compromising switch functionality.
Solution Approach 2:
The patent uses the existing cover or frame structure as both the protective enclosure and the touch sensing interface. This integration allows the switch function to be implemented without creating additional openings or seams, maintaining dustproof and waterproof sealing.
4Volume of moving object
If a touch switch portion is used to replace mechanical switch, then device size is reduced, but malfunction due to external factors increases
Solution Approach 1:
The patent extracts the touch sensing portion from the internal components and integrates it into the cover or frame structure. A reference sensing portion is also provided to detect external factors such as temperature changes or noise. By separating the touch detection function from the sensing elements, the system can compensate for external influences and maintain reliability.
Solution Approach 2:
The patent uses a reference sensing portion that detects external factors such as temperature changes, noise, or other environmental influences. This reference signal is used to compensate for variations in the touch sensing portion, allowing the system to distinguish between actual touches and environmental disturbances, thereby preventing malfunctions.
5Ease of manufacture
If conventional touch sensing is used, then touch detection function is provided, but noise and temperature influence deteriorate detection performance
Solution Approach 1:
The patent extracts the reference sensing function from the touch detection system and implements it as a separate reference sensing portion. This reference portion detects only external factors such as temperature changes or noise without being affected by touches. The system then uses this reference information to compensate for environmental influences, improving touch detection precision.
Solution Approach 2:
The patent implements a feedback mechanism where the reference sensing portion continuously monitors environmental factors and provides compensation signals to the touch detection circuit. This feedback allows the system to distinguish between touches and environmental disturbances, maintaining high detection accuracy under varying conditions.
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 provides a compact, safe, and reliable touch sensing mechanism that prevents malfunctions due to external factors, ensuring accurate detection and maintaining performance across varying conditions.
Implementation Method 1
a capacitance is varied by the first touch sensing portion according to parasitic capacitance generated between the first sensing electrode and the human body according to the touch applied through the cover
Implementation Method 2
configured to provide reference inductance of the reference coil that is constant, regardless of a touch applied through the frame
Implementation Method 3
a shielding member disposed between the reference coil and the side portion, and configured to block external influences
Data Source
AI summary
A touch sensing device applied to an electronic device including a side portion having a cover that is nonconductive, and a frame that is conductive, includes: a first touch sensing portion including a first sensing electrode and a first sensing inductor disposed inside the cover and electrically connected to each other, wherein, in response to a touch applied through the cover by a human body, a capacitance is varied by the first touch sensing portion according to parasitic capacitance generated between the first sensing electrode and the human body according to the touch applied through the cover; and a reference sensing portion including a reference coil disposed inside the side portion and configured to provide reference inductance of the reference coil that is constant, regardless of a touch applied through the frame.