Heart rate sensor with high-aspect-ratio photodetector element

A technology for photodetectors and components, used in optical sensors, sensors, diagnostic recording/measurement, etc., to solve problems such as the inability of light to reach the photodetector directly

Pending Publication Date: 2016-12-07
FITBIT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The light source and photodetector are usually arranged so that light from the light source cannot reach the photodetector directly

Method used

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  • Heart rate sensor with high-aspect-ratio photodetector element
  • Heart rate sensor with high-aspect-ratio photodetector element
  • Heart rate sensor with high-aspect-ratio photodetector element

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Embodiment Construction

[0085] The present invention relates to PPG sensors, and more particularly to wearable biometric monitoring devices (also referred to herein as "biometric tracking devices", "biometric tracking modules", "wearable health monitors") etc.) for use with PPG sensors. The inventors have determined that the use of non-square photodetector elements in a PPG sensor can provide significant performance improvements over conventional PPG designs that typically utilize square photodetector elements. The inventors also determined that this performance increase could be obtained if desired, while still maintaining essentially the same power consumption as a square photodetector element in a conventional PPG design.

[0086] figure 2 Depicted is a simplified representation of a wrist-worn wearable health monitor 200 incorporating a PPG sensor using non-square photodetector elements according to an example implementation of concepts implemented by the present inventors and discussed below. ...

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Abstract

Heart rate sensors including high-aspect-ratio photodetector elements are discussed herein. Such high-aspect-ratio photodetector elements may provide improved signal-strength-to-power-consumption performance for heart rate sensors incorporating such photodetector elements as compared with heart rate sensors incorporating, for example, square photodetector elements.

Description

technical field [0001] The invention relates to a heart rate sensor. More particularly, the present invention relates to a heart rate sensor having a photodetector element. Background technique [0002] Heart rate may be measured using any of a variety of different sensors including, for example, electrode-based sensors such as EKG sensors and optical sensors such as photoplethysmography (PPG) sensors. A PPG sensor typically consists of a light source and a photodetector placed near a person's skin. The light source and photodetector are typically arranged such that light from the light source cannot reach the photodetector directly. However, when a PPG sensor is placed near a person's skin, light from the light source can diffuse into the person's flesh and then be emitted back from the person's flesh so that the photodetector can detect the light. The amount of this light emitted from the human body can vary depending on the heart rate because the amount of blood presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0245
CPCA61B5/02416A61B5/02427A61B5/0245A61B2562/0233A61B2562/046A61B5/02438A61B5/681A61B5/14552A61B5/7278A61B2562/04
Inventor 克里斯·H·萨兰托斯皮特·W·理查兹
Owner FITBIT INC
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