Pulse Wave Sensor Mounted State Detection and Power Control
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Solution Overview
Problem
Existing pulse wave detection devices face challenges in reducing power consumption while minimizing the influence of stray light, particularly when the device is in motion, as they often require continuous light emission for accurate detection, leading to increased power usage and instability in signal detection.
Innovation Solution
A control device and method that determines the mounted state of a pulse wave detection device using a configuration with a light source and multiple light receiving elements at different distances, allowing for selective light emission based on the mounted state, thereby reducing power consumption by controlling light emission frequency and power supply to the detection circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pulse wave sensor continuously emits light for accurate detection, then the detection accuracy is improved, but the power consumption increases
Solution Approach 1:
The patent applies dynamics by making the light emission frequency adjustable based on the mounted state determination. The system transitions from continuous light emission to intermittent emission, dynamically adapting the detection operation intensity according to whether the device is properly mounted on the body, thereby resolving the contradiction between continuous accurate detection and power consumption reduction.
Solution Approach 2:
The patent changes the parameter of light emission frequency based on the determined mounted state. When properly mounted, the system uses higher emission frequency for accurate detection; when not mounted, it reduces emission frequency to lower power consumption, thus resolving the contradiction through parameter adaptation.
2Use of energy by moving object
If the light emission frequency is reduced to save power, then the power consumption is reduced, but the influence of stray light increases
Solution Approach 1:
The patent uses feedback from the mounted state determination (based on detection values from light receiving elements) to control the light emission frequency. The system continuously monitors the detection environment and adjusts light emission accordingly, using feedback to distinguish between proper mounting conditions and stray light conditions, thereby reducing power consumption without significantly increasing stray light influence.
3Measurement precision
If additional contact sensors are added to determine mounted state, then the mounted state detection accuracy is improved, but the device complexity and cost increase
Solution Approach 1:
The patent makes the existing light receiving elements serve dual functions: both detecting pulse waves and determining mounted state. By utilizing the same components for multiple purposes, the system avoids adding separate contact sensors, thereby improving mounted state detection accuracy without increasing device complexity or cost.
Solution Approach 2:
The system uses its own detection components (light receiving elements) to determine its own mounted state without requiring external or additional specialized sensors. The detection device serves itself by using the existing optical detection path to assess mounting conditions, thereby avoiding increased complexity while achieving accurate mounted state detection.
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
This approach effectively reduces power consumption during non-mounted states, minimizes the impact of stray light, and enhances the accuracy of pulse wave detection without the need for additional contact sensors, reducing device cost and size while preventing false detection.
Implementation Method 1
a light source configured to emit light beams
Implementation Method 2
a plurality of light receiving elements configured to receive the light beams emitted by the light source
Data Source
AI summary
There is provided a control device including: a determination unit configured to determine a mounted state of a detection device on the basis of a plurality of detection values, the detection unit including a light source and a plurality of light receiving elements and detecting a pulse wave, the plurality of detection values corresponding to signals output in response to light beams received from the plurality of light receiving elements, respectively, distances between the light source and the respective plurality of light receiving elements being different from each other; and an operation control unit configured to control an operation related to detection of the pulse wave performed by the detection device on the basis of a determination result of the mounted state.