Wearable Biosensor Assembly With 3D Contact Routing
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Solution Overview
Problem
Wearable electronic devices face spatial constraints due to the need to accommodate various electronic components, and there is a requirement for improved electric connection between these components to enhance functionality and assembly efficiency.
Innovation Solution
The design includes a display, a processor connected to the display, a light-transmitting cover, a flexible printed circuit board with a wireless charging coil, a first bio-signal sensing unit with light-emitting and receiving units on the circuit board, a second bio-signal sensing unit with internal and external electrodes, and a contact unit connecting these components for efficient signal processing within a compact space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If various electronic components are disposed inside the electronic device to equip it with multiple functions, then the functionality is improved, but the volume of the electronic device increases
Solution Approach 1:
The contact unit is embedded within the cover structure, with its side surface inserted into a groove of the cover. This nesting approach allows the contact unit to be integrated into the existing device architecture without requiring additional external space, thereby resolving the contradiction between adding functionality and maintaining compact volume.
Solution Approach 2:
The contact unit extends in the thickness direction of the cover rather than occupying planar space. By utilizing the vertical dimension (thickness direction) for component placement, the design accommodates additional functional elements without increasing the device's footprint area, thus resolving the volume-functionality contradiction.
2Ease of manufacture
If the contact structure is configured in a planar manner, then the assembly is simpler, but the electric connection efficiency is reduced
Solution Approach 1:
The contact unit transitions from a purely planar configuration to a three-dimensional structure that extends in the thickness direction. This vertical extension creates a stereoscopic contact path that improves electrical connection efficiency by reducing contact resistance and enhancing signal transmission, while the integrated design maintains assembly simplicity.
3Volume of moving object
If components are densely packed to save space, then the volume is reduced, but the assembly difficulty increases
Solution Approach 1:
The contact unit is merged with the cover structure through the groove insertion mechanism, creating an integrated assembly. This combination reduces the number of separate components that need to be handled during assembly, thereby simplifying the assembly process even though components are densely packed within the device volume.
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
This configuration allows for efficient disposition and connection of components within the limited space of wearable devices, enabling effective measurement of biometric information and facilitating assembly while improving electric connections.
Implementation Method 1
a first bio-signal sensing unit including a light-emitting unit and a light-receiving unit mounted on the first surface of the flexible printed circuit board
Implementation Method 2
a first bio-signal sensing unit including a light-emitting unit and a light-receiving unit mounted on the first surface of the flexible printed circuit board
Implementation Method 3
a coil for wireless charging disposed to surround the flexible printed circuit board
Data Source
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AI summary
An electronic device, according to various embodiments disclosed in the present document, may comprise: a display; a processor operatively connected to the display; a cover which faces the display and of which at least a part is formed of a light transmitting material; a flexible printed circuit board having a first side facing the cover, and a second side corresponding to the opposite side of the first side; a coil for wireless charging disposed to surround the flexible printed circuit board; a first bio-signal sensing unit including a light-emitting unit and a light-receiving unit mounted on the first side of the flexible printed circuit board; a second bio-signal sensing unit including an internal electrode formed inside the cover, which is a portion facing the flexible printed circuit board, and an external electrode electrically connected to the internal electrode and formed outside the cover; a contact unit having one end mounted on the first side of the flexible printed circuit board and extending to the cover such that the opposite end thereof is connected to the internal electrode of the second bio-signal sensing unit; and a signal processing unit mounted on the second side of the flexible printed circuit board so as to process a first bio-signal sensed by the first bio-signal sensing unit and a second bio-signal sensed by the second bio-signal sensing unit. Various other embodiments are possible.