Housing Light-Shielding Baffle for Wearable Sensor Crosstalk
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Solution Overview
Problem
Smart wearable devices that integrate optical components for measuring physiological data face errors due to crosstalk between light-transmitting parts, leading to reduced accuracy of test results.
Innovation Solution
A housing design that includes a light-shielding baffle between the first and second light-transmitting parts, with these parts directly connected to the housing body, and materials with thermal expansion coefficients closely matched to the housing body, preventing crosstalk and enhancing mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the light emitter and light detector are positioned close to each other to simplify the device structure, then the device complexity is reduced, but light crosstalk occurs between the first and second light-transmitting parts, reducing measurement precision
Solution Approach 1:
A light-shielding baffle is introduced as an intermediary component between the first light-transmitting part and the second light-transmitting part. This baffle blocks the direct line of sight between the light emitter and light detector, preventing stray light from the light emitter from entering the second light-transmitting part and being detected, thereby eliminating crosstalk while maintaining the close positioning of components
Solution Approach 2:
The housing is segmented into distinct functional regions: a first light-transmitting part for the light emitter, a second light-transmitting part for the light detector, and a light-shielding baffle region between them. This segmentation allows each component to perform its specific function independently while preventing interference between adjacent components
2Adaptability or versatility
If different materials with different thermal expansion coefficients are used for the housing body and light-transmitting parts, then the manufacturing flexibility is improved, but the mechanical strength and impact resistance of the housing deteriorates
Solution Approach 1:
The thermal expansion coefficient is used as a critical selection parameter for materials. The housing body and light-transmitting parts are required to have thermal expansion coefficients that differ by no more than 20%, which significantly narrows the material selection range compared to traditional designs. This parameter constraint ensures that all components expand and contract at similar rates during temperature cycling, preventing stress concentration and cracking while maintaining manufacturing flexibility
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
The housing design effectively prevents crosstalk between light-transmitting parts, improving the accuracy of detection results in smart wearable devices and enhancing the mechanical strength and impact resistance of the housing.
Implementation Method 1
a light-shielding baffle, arranged between the first light-transmitting part and the second light-transmitting part
Implementation Method 2
an absolute value of a difference between a thermal expansion coefficient of a material of the first light-transmitting part and a thermal expansion coefficient of a material of the housing body is a first difference, and a ratio of the first difference to the thermal expansion coefficient of the material of the housing body is less than or equal to 20%
Data Source
AI summary
A housing, a manufacturing method for the housing, and an electronic device. The housing includes a housing body, a first light-transmitting part, a second light-transmitting part spaced apart from the first light-transmitting part, and a light-shielding baffle arranged between the first light-transmitting part and the second light-transmitting part. At least one of the following is satisfied: at least a portion of an outer peripheral edge of the first light-transmitting part is directly connected to the housing body; and at least a portion of the outer peripheral edge of the second light-transmitting part is directly connected to the housing body.