Optical Tracking Device with Microstructured Stray Light Shielding
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Solution Overview
Problem
Existing optical tracking systems face challenges in improving sensing stability while reducing costs, with stray light causing misjudgment and interference.
Innovation Solution
An optical tracking device incorporating a light shielding plate and light path reconstruction structure with micro structures to block stray light and reconstruct the light path, enhancing accuracy and reducing misjudgment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light shielding plate is added to block stray light, then sensing stability and accuracy are improved, but device complexity increases
Solution Approach 1:
The light shielding plate is divided into multiple light shielding regions (first, second, third light shielding regions) that correspond to different light paths. Each region independently shields specific stray light sources, allowing targeted elimination of interference while maintaining overall system simplicity.
Solution Approach 2:
The light path reconstruction structure serves as an intermediary component between the sensing light source and the sensing region. It reconstructs the light path through micro structures while the light shielding plate acts as an intermediary to block stray light, together forming a coordinated solution that improves reliability without excessive complexity.
2Measurement precision
If a light path reconstruction structure with micro structures is installed, then sensing accuracy is improved by eliminating stray light paths, but manufacturing complexity increases
Solution Approach 1:
The light path reconstruction structure incorporates micro structures (micro holes, micro grooves, or micro protrusions) that create controlled light path reconstruction. These micro structures function similarly to porous materials by allowing selective light transmission while blocking stray light paths, achieving high measurement precision through standardized micro-fabrication techniques.
Solution Approach 2:
The light shielding plate and light path reconstruction structure are designed and positioned in advance during the manufacturing process. The micro structures are pre-formed on the light path reconstruction structure, and the light shielding plate is pre-configured with specific shielding regions, eliminating the need for complex post-assembly adjustments and simplifying the overall manufacturing process.
3Measurement precision
If multiple light shielding regions are created to block different stray light paths, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Multiple light shielding regions (first, second, third light shielding regions) are merged into a single integrated light shielding plate structure. This unified structure simultaneously performs multiple shielding functions for different stray light paths, achieving high tracking precision while avoiding the complexity of multiple separate shielding components.
Solution Approach 2:
The light shielding plate serves multiple functions: it blocks stray light from different directions, supports the light path reconstruction structure, and defines the sensing region. This multi-functional design achieves improved measurement precision without proportionally increasing device complexity, as one component performs several critical roles.
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 device effectively reduces stray light interference, improving sensing stability and accuracy by blocking unexpected light paths and reconstructing the light path, thereby enhancing tracking precision.
Implementation Method 1
The light shielding effect of the light shielding plate may block an unexpected light emission region and absorb the stray light
Implementation Method 2
the micro structures of the surfaces of the light path reconstruction structure may cause diffusion and reconstruction when the sensing light passes through the micro structures
Data Source
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AI summary
An embodiment of an optical tracking device includes a circuit board, a sensing light source, a light shielding plate, and a light path reconstruction structure. The sensing light source is electrically connected to the circuit board and is configured to emit sensing light. The light shielding plate is disposed on the sensing light source, and the light path reconstruction structure overlaps the sensing light source. The light path reconstruction structure has a first surface facing the sensing light source and a second surface away from the sensing light source. The first surface has a first micro structure, and the second surface has a second micro structure. The sensing light passes through the first micro structure and the second micro structure in sequence after being emitted from the sensing light source.