Photoelectric Sensor Module with Line-Symmetric Substrate
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Solution Overview
Problem
Existing photoelectric sensor modules face challenges in reducing costs and improving measurement accuracy due to the need for multiple circular substrates, which results in low utilization efficiency and increased costs, as well as difficulties in averaging the influence of stray light from multiple light emitting elements.
Innovation Solution
A photoelectric sensor module design featuring a substrate with linear edges, where the light emitting elements and light receiving element are line-symmetric with respect to a virtual straight line, allowing for a 2D arrangement without unused areas, reducing component costs, and equalizing the influence of stray light, thereby enhancing measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple circular substrates are used to arrange light emitting elements and light receiving element, then measurement accuracy is improved by averaging stray light influence, but substrate utilization efficiency decreases and manufacturing cost increases
Solution Approach 1:
The invention divides the substrate into multiple regions, each containing light emitting elements and light receiving elements arranged in specific patterns. This segmentation allows efficient use of substrate space while maintaining the ability to average stray light effects through multiple measurement points.
Solution Approach 2:
The invention uses asymmetric arrangement of light emitting elements and light receiving elements on the substrate, breaking away from traditional circular symmetric patterns. This asymmetric layout optimizes space utilization and allows more elements to be packed on the substrate without wasting area, while still achieving stray light averaging through proper geometric distribution.
2Measurement precision
If multiple circular substrates are used to arrange light emitting elements and light receiving element, then measurement accuracy is improved by averaging stray light influence, but manufacturing cost increases
Solution Approach 1:
The invention combines multiple functional elements (light emitting elements of different wavelengths and light receiving elements) onto a single substrate, eliminating the need for multiple separate circular substrates. This merging reduces manufacturing complexity and cost while maintaining the ability to perform multi-wavelength measurements for accurate oxygen saturation calculation.
Solution Approach 2:
The single substrate is designed to perform multiple functions: housing light emitting elements of different wavelengths, light receiving elements, and conducting measurements that average stray light effects. This multi-functional design replaces what previously required multiple specialized substrates, reducing overall manufacturing cost.
3Measurement precision
If light emitting elements are arranged along the circumference of a circle, then stray light influence is averaged for accurate measurement, but device complexity increases
Solution Approach 1:
Instead of arranging elements in traditional circular patterns around a central point, the invention inverts the approach by distributing elements across the substrate in asymmetric regions. This inversion maintains the statistical averaging of stray light effects but achieves it through a simpler, more regular geometric distribution that reduces alignment and positioning complexity.
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 design increases substrate utilization efficiency, reduces manufacturing costs, and improves the accuracy of calculating oxygen saturation by equalizing the influence of stray light from different wavelengths, allowing for more precise measurements.
Implementation Method 1
a first light emitting element that is mounted on the substrate and emits light having a first wavelength
Implementation Method 2
light emitted from the first light emitting element and reflected by an object
Implementation Method 3
a second light emitting element that is mounted on the substrate and emits light having a second wavelength different from the first wavelength
Implementation Method 4
light emitted from the second light emitting element and reflected by the object
Implementation Method 5
an electrical signal photoelectrically converted by the light receiver
Data Source
AI summary
A photoelectric sensor module includes a first light emitting element that emits light having a first wavelength, a second light emitting element that emits light having a second wavelength different from the first wavelength, and a light receiving element that receives light emitted from the first light emitting element and reflected by an object and light emitted from the second light emitting element and reflected by the object are mounted on a substrate with linear edges. With respect to a virtual straight line defined on a surface of the substrate, a light emitting portion of the first light emitting element and a light emitting portion of the second light emitting element are line-symmetric, a light receiving portion of the light receiving element is line-symmetric, and a shape of the substrate in plan view is line-symmetric.