Reflectance-Differentiated Detection Device for Stray-Light Control
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Solution Overview
Problem
Optical detection devices for human bodies are often too large, making them inconvenient to carry or wear, and manufacturers seek to miniaturize these devices while enhancing user experience and product competitiveness.
Innovation Solution
A detection device design featuring a substrate with distinct surface areas of varying reflectance, where a high-reflectance area houses the light emitter and a low-reflectance area houses the light receiver, surrounded by walls with matching reflectance properties to minimize stray light interference and optimize light transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optical detection device is made larger to improve detection performance, then the detection accuracy is improved, but the device becomes inconvenient to carry or wear
Solution Approach 1:
The substrate is designed with different reflectance properties in different regions: the first surface area has high reflectance to direct light from the light emitter, while the second surface area has low reflectance to absorb stray light near the light receiver. This local differentiation of optical properties enables effective light management in a compact device structure, resolving the contradiction between detection accuracy and portability.
2Ease of operation
If the device is miniaturized to improve portability, then the convenience to carry or wear is improved, but stray light interference increases affecting detection quality
Solution Approach 1:
The second surface area surrounding the light receiver is designed with low reflectance to absorb stray light, while the first surface area has high reflectance to direct useful light. This spatial differentiation of reflectance properties effectively manages stray light in the miniaturized device, maintaining detection quality despite reduced device size.
Solution Approach 2:
The low-reflectance second surface area converts harmful stray light into absorbed energy, transforming a negative factor (stray light interference) into a beneficial effect (light absorption) that improves detection accuracy in the compact device.
3Use of energy by moving object
If the light emitter area is increased to improve light generation efficiency, then the light output is improved, but the device size increases
Solution Approach 1:
The first surface area is designed with high reflectance to maximize light generation efficiency from the light emitter, while the second surface area has low reflectance to minimize interference. This local optimization allows efficient light generation in a compact configuration, resolving the contradiction between light output and device size.
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 design efficiently generates and directs detection light outward while absorbing stray light, improving the light receiver's ability to detect without interference, thus enhancing the device's compactness and detection efficiency.
Implementation Method 1
the first surface area has a first reflectance greater than a second reflectance of the second surface area
Implementation Method 2
stray light around the light receiver is absorbed
Data Source
AI summary
A detection device includes a substrate, a light-emitter, and a light receiver. The substrate includes a first surface area and a second surface area, in which the first surface area has a first reflectance greater than a second reflectance of the second surface area. The light emitter is disposed on the first surface area, and the light receiver is disposed on the second surface area. The light receiver has a third reflectance which is substantially the same as the second reflectance of the second surface area.