Wearable Sensor Elastic Moduli Design for Arm Contour Tracking
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Solution Overview
Problem
Existing myoelectric detection devices struggle to maintain tight contact with the surface of a living body due to their inability to follow the shape of the arm, leading to inadequate contact and measurement accuracy.
Innovation Solution
An electronic apparatus with a base, a functional element, and first and second members with different elastic moduli that allow the functional element to change attitude and follow the surface of a target object, such as a living body, by becoming elastically deformed, while being connected via an adhesive layer with varying elastic properties to ensure secure attachment and accurate biological information acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the myoelectric detection device is fastened to a rigid device fastener, then the device is securely attached to the arm, but the device cannot follow the surface shape of the arm and cannot maintain tight contact
Solution Approach 1:
The patent changes the physical parameter of the fastening members by using elastic materials with appropriate modulus of elasticity. The first and second elastic fastening members are made of elastic material that can deform to follow the arm surface while maintaining attachment strength, resolving the contradiction between rigid attachment and surface adaptability.
Solution Approach 2:
The patent employs composite material structure by combining elastic fastening members with different elastic moduli. The first elastic fastening member has a higher modulus of elasticity than the second elastic fastening member, creating a composite system that balances attachment strength and surface conformity. This composite approach allows the device to maintain secure attachment while adapting to the arm's surface shape.
2Device complexity
If the functional element is connected with a single rigid member, then the structure is simple, but the functional element cannot change attitude to follow the surface of the target object
Solution Approach 1:
The patent divides the single rigid connecting member into multiple segmented elastic fastening members (first and second elastic fastening members). These segmented members can independently deform and rotate, allowing the functional element to change attitude and follow the surface of the target object. The segmentation enables each member to contribute to both structural support and adaptive movement.
Solution Approach 2:
The patent transforms the static rigid connection into a dynamic system by using elastic materials that can deform and rotate. The first and second elastic fastening members can dynamically adjust their configuration in response to surface irregularities, enabling the functional element to maintain contact while changing its attitude relative to the base.
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 apparatus effectively follows the surface of a living body, enabling precise and accurate acquisition of biological information like electrocardiogram and body temperature, with enhanced adhesive strength and flexibility, ensuring reliable data collection.
Implementation Method 1
The first member and the second member have different elastic moduli from each other. Since the first and second members become elastically deformed, the functional element can easily change attitude with respect to the base
Implementation Method 2
An electronic apparatus with a base, a functional element, and first and second members with different elastic moduli that allow the functional element to change attitude and follow the surface of a target object
Data Source
AI summary
An electronic apparatus includes: a base; a functional element; and a first member and a second member which connect the base and the functional element to each other. The first member and the second member have different elastic moduli from each other. The elastic modulus of the first member is higher than the elastic modulus of the second member. At least a part of the first member is situated more closely to a center of the functional element than the second member, as viewed in a plan view taken from a direction in which the base and the functional element are arrayed.