Glove Fingertip Pressure Sensor With Stress-Isolated Lamination
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Solution Overview
Problem
Existing glove-type wearable sensors with film-like pressure sensors incorporated into fingertips face issues with stress-induced reactions causing inaccurate sensor readings due to stresses from the flexible printed circuit and protective film, leading to unnecessary sensor values.
Innovation Solution
The pressure sensor is designed with a laminated structure of flexible printed circuits and sheet-like pressure sensitive elements, using double-sided non-adhesive films to isolate the pressure sensitive element from stresses from the flexible printed circuit and protective film, ensuring accurate detection of applied pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a film-like pressure sensor is incorporated into a thin work glove to achieve good wearing feeling, then the wearing comfort and flexibility are improved, but stress acts on the pressure sensitive element during wearing or finger bending causing inaccurate sensor readings
Solution Approach 1:
The pressure sensor is divided into separate functional layers: a flexible printed circuit board layer and a pressure sensitive element layer, which are laminated together. This segmentation allows each layer to perform its specific function independently while maintaining overall flexibility for comfortable wearing.
Solution Approach 2:
A non-adhesive film is introduced as an intermediary layer between the flexible printed circuit board and the pressure sensitive element. This intermediary prevents stress transfer from the circuit board and protective film to the pressure sensitive element during wearing and finger bending, eliminating the source of measurement error while maintaining structural integrity.
2Length of stationary object
If the pressure sensor is made thin and flexible for glove incorporation, then the glove thickness and flexibility are improved, but the pressure sensitive element becomes vulnerable to stress from surrounding components
Solution Approach 1:
The pressure sensor utilizes thin flexible components including a flexible printed circuit board and thin pressure sensitive elements that can be incorporated into the glove structure. These flexible components maintain glove thinness and flexibility while the non-adhesive film protection ensures reliability by isolating the sensitive elements from stress.
Solution Approach 2:
The pressure sensor is constructed as a composite structure combining different materials: flexible printed circuit board material, non-adhesive film material, and pressure sensitive element material. This composite approach allows each material to contribute its optimal properties - flexibility from the circuit board, stress isolation from the non-adhesive film, and sensing capability from the pressure sensitive element.
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 sensor accurately reflects only the true pressure applied to the fingertip, emitting a reliable sensor signal by minimizing stress-induced interference from the flexible printed circuit and protective film.
Implementation Method 1
one sheet-like pressure sensitive element 13... only a pressure applied to a fingertip of a wearer after wearing the wearable sensor is detected
Data Source
AI summary
A technique that can emit a sensor signal that accurately reflects only the pressure to be truly detected in a glove-type wearable sensor in which a film-like pressure sensor is incorporated into a fingertip of a thin work glove is disclosed. In a film-like pressure sensor incorporated into a fingertip of a glove-type wearable sensor, three coordinate axis directions in a three-dimensional orthogonal coordinate system are assumed to be a vertical direction, a longitudinal direction of the pressure sensor, and a width direction of the pressure sensor, at least one or more flexible printed circuits and one sheet-like pressure sensitive element are laminated in the vertical direction, and only the pressure applied to the fingertip of a wearer after wearing the wearable sensor is detected.