Light detecting device, lighting module, and manufacturing method for the same
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Solution Overview
Problem
Wearable devices for heart rate detection often have unreliable accuracy due to inadequacies in optical design, leading to inconsistent signal reception and noise interference.
Innovation Solution
A lighting module comprising a carrier, a light assembly with multiple lighting units emitting beams of different wavelengths, and a lens assembly forming specific light distributions, including mesa-shaped and twin-peak shaped beams, which are optimized to enhance detection accuracy and signal-to-noise ratio through a casing design that blocks beams with large angles, thereby improving receiving accuracy and reducing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical design is used in wearable devices, then device simplicity is maintained, but detection accuracy and signal-to-noise ratio deteriorate
Solution Approach 1:
The optical system is segmented into multiple lighting units (first and second lighting units with different wavelengths) and corresponding detecting units arranged in specific patterns. This segmentation allows independent optimization of each unit's function while achieving superior overall detection accuracy through combined operation
Solution Approach 2:
Different regions of the optical system are assigned different qualities: first lighting units emit at first wavelengths with first view angles, while second lighting units emit at second wavelengths with second view angles. This local differentiation optimizes light-tissue interaction at specific locations to enhance detection accuracy
2Reliability
If conventional lighting and detection arrangement is used, then device simplicity is maintained, but noise interference increases and signal-to-noise ratio deteriorates
Solution Approach 1:
The system segments lighting and detection functions into distinct units with different wavelengths and view angles. Multiple first lighting units are paired with multiple first detecting units, and second lighting units with second detecting units, allowing selective signal reception that filters noise
Solution Approach 2:
The system uses multiple detecting units to receive reflected light signals and process them to distinguish valid physiological signals from noise. The arrangement enables cross-validation of signals through multiple detection paths, improving reliability
3Measurement precision
If simple lighting units are used, then manufacturing simplicity is maintained, but receiving accuracy deteriorates
Solution Approach 1:
The lighting assembly is segmented into standardized first lighting units and second lighting units that can be manufactured separately and assembled systematically. Each unit type has defined characteristics (wavelength, view angle) that simplify the manufacturing process while achieving high receiving accuracy through their coordinated arrangement
Solution Approach 2:
The system utilizes specific wavelength parameters and view angle parameters for different lighting units to optimize light-tissue interaction. By controlling these parameters during manufacturing, the system achieves high receiving accuracy without requiring overly complex manufacturing processes
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 enhances the accuracy and strength of optical signals received by wearable devices, improving the reliability of heart rate detection and reducing noise interference, thereby enhancing the signal-to-noise ratio.
Implementation Method 1
The at least one first lighting unit emits a first beam having a first wavelength
Implementation Method 2
the at least one second lighting unit emits a second beam having a second wavelength
Implementation Method 3
the first beam passes through the at least one first lens to form a first light distribution being substantially mesa-shaped
Implementation Method 4
the second beam passes through the at least one second lens to form a second light distribution being substantially twin-peak shaped with a recess in between
Data Source
AI summary
A light detecting device, a lighting module, and a manufacturing method for the same are provided. The lighting module includes a carrier, a light assembly having a first lighting unit and a second lighting unit, a lens assembly having a first lens and a second lens, and a casing surrounding the lens assembly. The first lighting unit emits a first beam having a first wavelength through the first lens to define a first view angle and the second lighting unit emits a second beam having a second wavelength through the second lens to define a second view angle. The first wavelength is smaller than the second wavelength, and the first view angle is greater than the second view angle.