Vehicle Rearview Mirror Pulse Wave Measurement
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Solution Overview
Problem
Existing pulse wave measuring techniques are complex and costly, requiring two mirrors to capture an infrared image of a user's eyes, which complicates the configuration and increases costs.
Innovation Solution
A pulse wave measuring apparatus that uses a visible light receiver and pulse wave calculator, integrated with a rearview mirror in a vehicle, to capture images of a user's eyes and cheeks without the need for complex mirror configurations, allowing for simpler and cost-effective pulse wave measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two mirrors are used to capture an infrared image of the user's eyes, then the pulse wave measurement can be performed, but the configuration becomes complicated and costs increase
Solution Approach 1:
The patent extracts the infrared imaging function from the dual-mirror system and implements it using a single mirror with a different configuration. The visible light receiver is positioned to capture reflected light from the user's cheek area through a single mirror, eliminating the need for the complex dual-mirror infrared system while maintaining pulse wave measurement capability
Solution Approach 2:
The patent replaces the expensive and complex dual-mirror infrared imaging system with a simpler, more cost-effective single mirror configuration using visible light reception. This substitution reduces both the complexity and cost of the system while achieving the same functional goal of pulse wave measurement
2Measurement precision
If two mirrors are used to capture an infrared image of the user's eyes, then the pulse wave measurement can be performed, but the configuration becomes complicated and costs increase
Solution Approach 1:
The patent extracts the infrared imaging function from the dual-mirror system and implements it using a single mirror with a different configuration. The visible light receiver is positioned to capture reflected light from the user's cheek area through a single mirror, eliminating the need for the complex dual-mirror infrared system while maintaining pulse wave measurement capability
Solution Approach 2:
The patent replaces the expensive and complex dual-mirror infrared imaging system with a simpler, more cost-effective single mirror configuration using visible light reception. This substitution reduces both the complexity and cost of the system while achieving the same functional goal of pulse wave measurement
3Measurement precision
If a visible light receiver is positioned to capture light from the user, then pulse wave measurement is enabled, but the user may visually recognize the camera causing distraction
Solution Approach 1:
The patent positions the visible light receiver to capture light from a specific local area (the user's cheek) rather than directly from the eyes. The receiver is placed in a region where it can obtain reflected light from the cheek through the mirror without being in the user's direct line of sight, thus maintaining measurement capability while avoiding distraction
Solution Approach 2:
The patent changes the spatial dimension of light capture by using the mirror to reflect light from the cheek area to the receiver. This dimensional approach allows the receiver to be positioned out of the user's direct visual field while still capturing the necessary light for pulse wave measurement
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
Enables the measurement of pulse waves with a simpler configuration, allowing users to drive without distraction from the camera, while maintaining accurate pulse wave acquisition and reducing costs.
Implementation Method 1
an upper end of an interior front mirror of the vehicle reflects the first light to produce the first reflection light, the upper end reflects the second light to produce the second reflection light
Implementation Method 2
a visible light receiver having a first surface... receives visible light via the first surface
Data Source
AI summary
A pulse wave measuring apparatus includes a visible light receiver having a first surface and a pulse wave calculator. When a vehicle with the visible light receiver is viewed from a side, the first surface is in a first region between a first optical path of first reflection light and a second optical path of second reflection light, first light comes from an eye of a user on a seat of the vehicle, second light comes from a cheek of the user, an upper end of a rearview mirror of the vehicle reflects the first light to produce the first reflection light and reflects the second light to produce the second reflection light, and the pulse wave calculator calculates a pulse wave of the user on the basis of a waveform of visible light received by the visible light receiver via the first surface and outputs the calculated pulse wave.