Multi-focus condenser for physiologic sensing
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Solution Overview
Problem
Traditional wearable physiologic detection devices face challenges in precisely measuring physiologic values like heart rates, blood oxygen, and blood sugar due to insufficient light intensity and noise interference from environmental light, and are unable to simultaneously analyze light sources with different wavelengths, leading to imprecise measurements.
Innovation Solution
A multi-focus physiologic sensing device is developed, featuring at least two lighting elements and a multi-focus condenser with ellipse reflection members that increase light-condensing intensity and collection angle, allowing simultaneous use of light sources with different wavelengths to focus on a detected skin, enhancing the detection of various physiologic signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a traditional condenser with small light-collection angle is used, then the device structure is simple, but the light-condensing efficiency is insufficient
Solution Approach 1:
The condenser is divided into multiple reflective sections (first reflective section, second reflective section, third reflective section) with different focal lengths, allowing each section to collect light from different angles and converge it to a common focal point, thereby increasing overall light-condensing efficiency while maintaining structural feasibility
Solution Approach 2:
The patent transitions from a single-focus condenser to a multi-focus condenser by introducing reflective surfaces with different focal lengths arranged in multiple dimensions, enabling simultaneous collection of light from various angles and wavelengths, thus improving light-condensing efficiency without excessive structural complexity
2Device complexity
If a single-focus condenser is used, then the device complexity is low, but different wavelength light sources cannot be simultaneously analyzed
Solution Approach 1:
The multi-focus condenser is designed with multiple reflective sections having different focal lengths, enabling it to simultaneously focus light from multiple wavelengths emitted by different lighting elements onto the detected skin, allowing the single condenser structure to perform multiple detection functions (heart rate, blood oxygen, blood sugar)
Solution Approach 2:
Different sections of the condenser are assigned different focal lengths tailored to specific wavelength ranges, with the first reflective section handling one wavelength range, the second reflective section handling another, and the third reflective section handling a third wavelength range, optimizing local optical properties for each function
3Measurement precision
If lighting element intensity is increased to overcome environmental noise, then the signal-to-noise ratio improves, but the device power consumption increases
Solution Approach 1:
The patent replaces the approach of increasing light source intensity (electrical/optical method) with a mechanical-optical system using multi-focus reflectors to concentrate and redirect existing light, achieving improved signal-to-noise ratio through optical concentration rather than increased power consumption
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 device significantly improves light-condensing efficiency and intensity, enabling precise detection of multiple physiologic signals by utilizing the variation in light intensity penetrating the skin, while warning users of adverse physiologic states in real-time.
Implementation Method 1
At least one multi-focus condenser has at least one first ellipse reflection member and at least one second ellipse reflection member... the two light sources focus light on the first confocal point through the second ellipse reflection member whereby the light is incident on the detected object
Implementation Method 2
The two light sources focus light on the first confocal point through the second ellipse reflection member... after the detected light source is reflected by the first ellipse reflection member
Data Source
AI summary
A multi-focus physiologic sensing device for condensing light is disclosed, comprises a multi-focus condenser has one first ellipse reflection member, and one second ellipse reflection member is arranged at an end of the first ellipse reflection member. The first ellipse reflection member has a first focus point thereon. The second ellipse reflection member has two second focus points thereon. A boundary between the first ellipse reflection member and the second ellipse reflection member has a first confocal point. Two lighting elements are respectively arranged on the two second focus points to generate light sources, that focus light on the first confocal point through the second ellipse reflection member, and then the detected object reflects the detected light source back to the first confocal point. Then, the detected light source is passes through the sensor from the first focus.