Resin Window Member With Embedded Light Shield for Pulse Sensing
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Solution Overview
Problem
Existing arm wearable electronic devices face issues with inaccurate pulse measurement due to direct emission of light from the light emitting element to the light receiving element, and insufficient fixing strength and waterproofness of light blocking structures.
Innovation Solution
A window member with a light transmissive resin plate featuring a partition groove and embedded light blocking section, fixed via a welded interface, ensuring that only reflected light is received by the light receiving element while maintaining waterproofness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light blocking section is embedded in a partition groove of a transparent window member, then direct light from the light emitting element to the light receiving element is blocked, but the fixing strength and waterproofness are insufficient
Solution Approach 1:
The window member is divided into distinct functional regions: a light transmitting region allowing reflected light to pass through, and a light blocking region preventing direct light from reaching the sensor. This segmentation is achieved through the partition groove and embedded light blocking section, which separate the optical paths and ensure measurement accuracy while maintaining structural integrity
Solution Approach 2:
A light blocking section is introduced as an intermediary element embedded within the partition groove of the window member. This intermediate structure effectively blocks direct light paths while allowing reflected light to reach the sensor, resolving the contradiction between measurement accuracy and structural reliability
2Measurement precision
If a partition groove with light blocking section is added to the window member, then light blocking function is achieved, but device complexity increases
Solution Approach 1:
The light blocking function is merged into the window member itself by embedding the light blocking section within the partition groove of the resin plate. This integration eliminates the need for separate light blocking components and simplifies the overall device structure while maintaining the required optical separation
Solution Approach 2:
The window member is designed to serve multiple functions simultaneously: it provides structural support, allows light transmission for sensing, and blocks direct light paths. The partition groove with embedded light blocking section enables the window member to function as both a protective cover and an optical control element, reducing the need for additional components
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
Accurate pulse measurement is achieved by blocking unnecessary light emission and ensuring waterproofness through a firmly fixed light blocking section in the partition groove.
Implementation Method 1
fixed to the resin plate by having a welded section at part of an interface in the partition groove
Data Source
AI summary
A window member including a light transmissive resin plate having a partition groove provided in a thickness direction in at least part of an outer peripheral portion of a predetermined area; and a light blocking section embedded in the partition groove and fixed to the resin plate by having a welded section at part of an interface in the partition groove.