Proximity Sensor Crosstalk Reduction via Selective Light Reception
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optical proximity sensors face challenges in reducing crosstalk, particularly when detecting objects that do not reflect infrared light well, such as black hair, and require complex gap adjustments and multiple gap adjusting members, leading to increased work burden and costs.
Innovation Solution
The proximity sensor incorporates a light receiving device with multiple light receiving parts that can be arbitrarily selected and configured, along with a surface emission laser element or light emitting diode, allowing for reduced crosstalk without the need for complex gap adjustments and additional gap adjusting members, using a transparent sealing member and optional light shielding for optical isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If gap adjustment is achieved by installing an interposer or using thick members, then crosstalk due to reflected lights can be reduced, but device complexity and manufacturing cost increase
Solution Approach 1:
The light receiving device is divided into multiple light receiving parts (first, second, third light receiving parts) positioned at different locations. This segmentation allows each part to receive light from different angles, enabling the system to reduce crosstalk by selectively using parts that do not receive reflected light, without requiring complex gap adjustment mechanisms.
Solution Approach 2:
Instead of adjusting the gap in the vertical dimension (which requires interposers or thick members), the patent utilizes the horizontal/planar arrangement of multiple light receiving parts at different positions. This dimensional approach to light reception allows crosstalk reduction through spatial distribution rather than vertical spacing adjustment.
2Object-affected harmful factors
If gap adjustment is achieved by installing thick members or interposers, then crosstalk can be reduced, but manufacturing precision and work burden increase
Solution Approach 1:
The light receiving device is divided into multiple light receiving parts (first, second, third light receiving parts) positioned at different locations. This segmentation allows each part to receive light from different angles, enabling the system to reduce crosstalk by selectively using parts that do not receive reflected light, without requiring complex gap adjustment mechanisms.
3Object-affected harmful factors
If multiple gap adjusting members are used, then crosstalk reduction can be optimized for different sets, but adaptability and versatility decrease
Solution Approach 1:
The patent designs a universal light receiving device with multiple light receiving parts that can be selectively activated based on the application requirements. This multi-functional design allows the same device structure to adapt to different sets and applications without requiring separate gap adjusting members for each configuration, thereby improving versatility while maintaining crosstalk reduction capability.
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 configuration enhances the flexibility and reliability of the sensor design, reduces crosstalk effectively, and simplifies the manufacturing process by eliminating the need for precise gap adjustments, thereby lowering costs and improving product reliability.
Implementation Method 1
emitting infrared light from a light emitting device toward the outside of a set
Implementation Method 2
detecting reflected light returned from outside of the set by a light receiving device
Implementation Method 3
a light receiving device having a plurality of light receiving parts
Data Source
AI summary
A proximity sensor which is capable of facilitating a measure against crosstalk for different sets is provided. The proximity sensor includes a light emitting device, and a light receiving device including a plurality of light receiving parts, wherein the light receiving device has a function of arbitrarily selecting any of the plurality of light receiving parts.