Smart Ring Sensor Placement for Optical Interference Reduction
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Solution Overview
Problem
Existing smart rings have inaccurate monitoring data due to unscientific sensor settings, particularly for heart rate and blood oxygen sensors.
Innovation Solution
A high-precision smart ring design that optimally arranges the blood oxygen emitter and receiver with a specific axial distance and incorporates a light shield to enhance measurement accuracy, along with a flexible circuit board and other components arranged to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the blood oxygen emitter and receiver are arranged without specific orientation control, then the device structure is simple, but the monitoring accuracy is insufficient
Solution Approach 1:
The patent applies local quality by specifying precise orientation requirements for the blood oxygen emitter and receiver at different locations within the ring. The emitter is arranged to face the inner circumferential surface while the receiver faces the outer circumferential surface, creating location-specific optical paths that maximize light absorption through blood vessels while maintaining overall structural simplicity
Solution Approach 2:
The patent transitions from conventional single-plane sensor arrangement to a three-dimensional spatial configuration where the emitter and receiver are positioned on opposite sides of the ring cross-section. This dimensional change creates multiple optical paths through the finger tissue, significantly improving measurement accuracy without substantially increasing device complexity
2Volume of moving object
If sensors are placed close together to reduce device size, then the device is more compact, but light interference between sensors increases
Solution Approach 1:
The patent implements local quality by providing individual light shielding structures for each sensor component. The emitter has its own shielding to contain forward-directed light, while the receiver has shielding to block stray light from other directions. This localized approach prevents cross-interference while maintaining compact overall dimensions
Solution Approach 2:
The patent introduces light shielding structures as intermediary elements between the emitter and receiver. These shields act as mediators that selectively block harmful light paths while allowing necessary optical signals to pass through designated channels, thereby reducing interference without requiring increased separation distance between sensors
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 design significantly improves the accuracy of heart rate and blood oxygen monitoring by optimizing sensor placement and reducing interference, leading to more reliable health data collection.
Implementation Method 1
The blood oxygen emitter emits infrared light to the finger of the human body. After the infrared light passes through the blood vessel, a part of the light will be absorbed, and another part will pass through the blood vessel and irradiate onto a photosensitive resistor of the blood oxygen receiver. Due to different oxygen contents, the absorption degree of the light by the blood is also different.
Implementation Method 2
another part will pass through the blood vessel and irradiate onto a photosensitive resistor of the blood oxygen receiver
Data Source
AI summary
Disclosed is a high-precision smart ring. Blood oxygen emitters are disposed on both sides of a blood oxygen receiver. The axial distance d between the blood oxygen emitter and the blood oxygen receiver at an inner-side wall surface of a ring holder is kept between 3.8 mm and 7 mm. In addition, a light shield is covered on the periphery of the blood oxygen receiver for preventing infrared light generated by a light source of the blood oxygen emitter from interfering with the receiving accuracy of the blood oxygen receiver, thereby greatly improving the accuracy of the heart rate and blood oxygen sensor. Then, the electrical devices on a flexible circuit board are arranged circumferentially around the ring holder in the sequence of the blood oxygen emitter, the blood oxygen receiver, blood oxygen emitter, a main control chip, an antenna, a storage battery, a charging interface and a temperature sensor.