Optical Sensor Cover Gap Layout for Low-Crosstalk Miniaturization
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Solution Overview
Problem
Existing optical sensors face challenges in reducing device size while minimizing crosstalk.
Innovation Solution
The optical sensor design includes a substrate with a light emitting element and a light receiving element, covered by transparent first and second covers with a gap between them, eliminating the need for a light-blocking wall and allowing for reduced device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-blocking wall is provided between the light emitting element and light receiving element, then crosstalk is reduced, but device size increases
Solution Approach 1:
The patent removes the light-blocking wall component entirely and replaces it with a gap structure between the light emitting element and light receiving element. This extraction of the harmful component (light-blocking wall) while maintaining the functional effect (crosstalk reduction) allows for device size reduction.
Solution Approach 2:
The patent introduces a gap as an intermediary space between the light emitting element and light receiving element. This gap acts as a mediator that blocks diffusion light paths without requiring solid light-blocking structures, thereby reducing crosstalk while minimizing space consumption.
2Volume of moving object
If the distance between light emitting element and light receiving element is reduced, then device size is reduced, but crosstalk increases
Solution Approach 1:
The patent addresses the distance-crosstalk tradeoff by changing the spatial arrangement from a direct linear proximity to a separated configuration with a gap. This dimensional reorganization allows the elements to be positioned closer in terms of overall device footprint while maintaining effective optical isolation through the gap structure.
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 effectively reduces crosstalk by minimizing light emission towards the light receiving element and allows for a more compact optical sensor structure.
Implementation Method 1
a transparent first cover (50) disposed on the substrate main surface to cover the light emitting element (30), and a transparent second cover (60) disposed on the substrate main surface to cover the light receiving element (40)
Data Source
AI summary
An optical sensor includes a substrate including a substrate main surface intersecting a thickness-wise direction, a light emitting element disposed on the substrate main surface, a light receiving element disposed on the substrate main surface, a transparent first cover disposed on the substrate main surface to cover the light emitting element, and a transparent second cover disposed on the substrate main surface to cover the light receiving element. The first cover and the second cover are spaced apart by a gap.