Wearable Photoelectric Pulse Sensor With Divergence-Reducing Lenses
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Solution Overview
Problem
Wearable devices face significant light loss and reduced detection precision in measuring parameters like heart rate and oxygen saturation due to severe light loss, leading to decreased light reflection and increased power consumption.
Innovation Solution
Incorporating lenses on the wearable device to reduce the divergence angle of light emitted by light emitting components, concentrating light rays, and using specific lens designs to enhance light absorption and minimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light emitting components emit light without lenses, then the device structure is simple, but light loss is severe and detection precision is reduced
Solution Approach 1:
The patent introduces a lens as an intermediary component between the light emitting component and the human body. The lens focuses and directs the emitted light, reducing light loss and improving the amount of light that penetrates into the body for detection, thereby resolving the contradiction between measurement precision and energy loss.
Solution Approach 2:
The patent changes the optical parameters of the light emission by introducing a lens with specific focal length and optical properties. This parameter change concentrates the light into a more effective beam, reducing divergence and improving light utilization efficiency, which addresses both detection precision and energy loss issues.
2Loss of energy
If lenses are added to reduce light divergence, then light utilization is improved, but device complexity increases
Solution Approach 1:
The patent divides the photoelectric pulse sensor into distinct functional modules: light emitting components, lenses, and light receiving components. This segmentation allows each component to be optimized independently and facilitates modular assembly, reducing the overall complexity impact while maintaining improved light utilization efficiency.
Solution Approach 2:
The lens component serves multiple functions simultaneously: it focuses the light to improve utilization efficiency, protects the light emitting component, and helps define the optical path. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
3Measurement precision
If light divergence angle is reduced by lenses, then detection precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs flexible mounting structures and adjustable positioning mechanisms for the lenses, allowing for dynamic adjustment during assembly and manufacturing. This flexibility simplifies the manufacturing process by accommodating variations in component tolerances and making alignment adjustments easier, thereby reducing manufacturing complexity while maintaining detection precision.
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
Improves detection precision of heart rate and oxygen saturation by increasing the depth of light penetration into the body and reducing power consumption.
Implementation Method 1
at least one lens disposed on an out-light side of the at least one light emitting component, where each lens corresponds to at least one light emitting component, and each lens is capable of reducing a divergence angle of light emitted by the at least one light emitting component corresponding to the lens
Implementation Method 2
at least one light emitting component that is mounted on one side of the substrate and is configured to emit light on at least one optical wavelength band
Implementation Method 3
The PPG is a method for measuring a parameter such as a heart rate and oxygen saturation based on photoelectric detection according to a principle that a blood volume changes with a pulse
Data Source
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AI summary
The present invention provides a wearable device (10) and a photoelectric pulse sensor component (40), and relates to the field of electronic device technologies, to reduce a divergence angle of light emitted by a light emitting component (112) in the wearable device (10), and improve light utilization, thereby improving detection precision of a parameter such as a heart rate and oxygen saturation, and reducing power consumption. The wearable device (10) includes: a substrate (115); at least one light emitting component (112) that is mounted on one side of the substrate (115) and is configured to emit light on at least one optical wavelength band; and at least one lens (117) disposed on an out-light side of the at least one light emitting component (112), where each lens (117) corresponds to at least one light emitting component (112), and each lens (117) is capable of reducing a divergence angle of light emitted by the at least one light emitting component (112) corresponding to the lens (117). The photoelectric pulse sensor component (40) may be mounted in a wearable object, so that when the wearable object is worn on a target creature, a parameter such as a heart rate and oxygen saturation of the target creature can be detected.