Wearable Device MEMS Mirror Optical Path Noise Reduction
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Solution Overview
Problem
Wearable devices face challenges with surface reflection noise and increased battery consumption due to limited optical path intervals between light emitting and receiving elements, leading to reduced accuracy and shorter device lifespan.
Innovation Solution
A wearable device with a micro-electro-mechanical systems (MEMS) mirror reflector is used to optimize the optical path by reflecting light between the light emitting and receiving elements, minimizing surface reflection and adjusting reflection angles for improved signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the interval between the light emitting element and the light receiving element is limited, then the device size is reduced, but surface reflection noise increases and measurement precision deteriorates
Solution Approach 1:
The patent introduces a reflector to change the optical path from a direct linear interval to a reflected path, effectively utilizing spatial dimensionality to increase the optical path length without increasing the physical device footprint. This resolves the contradiction by allowing sufficient light-tissue interaction distance while maintaining compact device dimensions.
Solution Approach 2:
The reflector acts as an intermediary element that redirects light from the emitting element to the receiving element through a controlled optical path. This intermediary component enables the system to achieve the required optical path length for reduced surface reflection noise without requiring a directly proportional increase in device size.
2Measurement precision
If the interval between the light emitting element and the light receiving element is increased to reduce surface reflection noise, then measurement precision is improved, but power consumption increases
Solution Approach 1:
By utilizing the reflector to create an indirect optical path, the system achieves extended light-tissue interaction distance without requiring proportional increases in component spacing. This dimensional approach allows improved signal-to-noise ratio while avoiding the exponential power consumption increases that would result from simply increasing the interval between emitting and receiving elements.
3Use of energy by moving object
If additional light receiving devices are configured to reduce power consumption, then energy efficiency is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and addresses the root cause of power consumption issues by optimizing the optical path design with a reflector. This single-component solution improves signal quality and reduces the need for multiple redundant light receiving devices, thereby avoiding the complexity and manufacturing cost increases that would result from adding additional sensors or receiving elements.
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 solution reduces noise reflected on the skin surface, minimizes the optical path through skin tissue, and enhances the accuracy of human body signal detection, potentially extending device lifespan and reducing power consumption.
Implementation Method 1
a first reflector disposed on the substrate adjacent to the light emitting unit and configured to reflect light generated by the light emitting unit
Data Source
AI summary
A wearable device according to an embodiment comprises: a substrate; a light-emitting unit disposed on the substrate; a light-receiving unit disposed on the substrate and spaced apart at a predetermined distance from the light-emitting unit; and a first reflection part disposed on the substrate adjacent to the light-emitting unit so as to reflect light emitted from the light-emitting unit.