Multi-Source Optical Engine Layout to Block Light Interference
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Solution Overview
Problem
Optical navigation devices face challenges in distinguishing working surfaces of different materials due to variations in reflectivity, leading to interference between emission and reflected light from multiple light sources.
Innovation Solution
An optical engine with a barrier structure and multiple light sources is designed to prevent interference by strategically positioning and tilting light sources and using a lens to guide reflected light to an image sensor, allowing for accurate identification of different working surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light sources are used to illuminate different working surfaces, then the adaptability to different working surfaces is improved, but the interference between emission light and reflected light from different light sources increases
Solution Approach 1:
The optical engine is segmented into multiple independent illumination channels, each with its own light source (first light source, second light source) configured for different working surfaces. This segmentation allows each light source to be optimized for specific surface types while reducing cross-interference through spatial separation.
Solution Approach 2:
A barrier structure is introduced as an intermediary element between the light sources and the working surface. This barrier structure selectively blocks reflected light from entering the image sensor, mediating the interaction between multiple light sources and preventing harmful interference while maintaining useful illumination.
2Measurement precision
If a barrier structure is introduced to block reflected light, then the measurement precision of image features is improved, but the device complexity increases
Solution Approach 1:
The barrier structure is merged with the existing optical components and housing of the optical engine. Rather than being a separate added element, it is integrated into the overall structure, combining the light-blocking function with the mechanical support and optical alignment functions of existing components.
Solution Approach 2:
The barrier structure serves multiple functions simultaneously: it blocks reflected light from entering the image sensor, provides structural support for positioning light sources and lenses, and contributes to the overall mechanical integrity of the optical engine. This multi-functionality reduces the need for additional separate components.
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 solution enhances the accuracy of image feature identification by eliminating interference between light sources, enabling effective operation on various working surfaces.
Implementation Method 1
The first light source is arranged inside the first opening and electrically coupled to the substrate, and used to generate emission light leaving the first opening in a direction perpendicular to the substrate
Implementation Method 2
The lens is arranged inside the second opening
Implementation Method 3
The first plane surface covers a part of the first light source to block reflected light of the emission light generated by the first light source from entering the third opening
Data Source
AI summary
There is provided an optical engine for a navigation device including a first light source, a second light source, a lens, a barrier structure and an image sensor. The barrier structure has a first space for containing the first light source, a second space for containing the lens and a third space for containing the second light source and the image sensor. The reflected light associated with the first light source propagates to the image sensor via the lens in the second space. The reflected light associated with the second light source propagates to the image sensor via the third space without passing through the lens in the second space.