Optical Tracking Diffuser Structure for Stray Light Blocking
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Solution Overview
Problem
Existing optical tracking devices have complex mechanical designs and high manufacturing costs due to complicated casing mechanisms and high-precision assembly requirements, leading to increased production costs and reduced product competitiveness.
Innovation Solution
An optical tracking device with a light diffuser comprising a diffusion film and a light shielding layer, which includes a transparent pattern, is used to block stray light and reorganize the light path, enhancing sharpness and accuracy while simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If surface-treated casing mechanisms or optical lenses combined with point light sources are used, then the optical tracking device can provide light spots for sensing, but the manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent extracts the light guiding function from complex optical lenses and casing mechanisms, concentrating it into a simple light guide component that directs light from the LED through a specific path to the sensor, thereby simplifying the overall structure while maintaining sensing capability
Solution Approach 2:
The patent segments the optical path into distinct functional zones: the light emitting region, the light guide component with specific path definition, and the sensing region, allowing each segment to be optimized independently and simplifying manufacturing
2Reliability
If complex casing mechanisms and high-precision assembly are used, then the optical tracking device can achieve stable light emission, but the production cost increases
Solution Approach 1:
The light guide component is designed to self-align and self-guide the light path through its intrinsic structural features, eliminating the need for complex external alignment mechanisms and high-precision assembly operations while ensuring stable light emission
Solution Approach 2:
The patent changes the geometric parameters and material properties of the light guide component to optimize light transmission efficiency and stability, achieving reliable performance through parameter optimization rather than complex mechanical structures
3Measurement precision
If special optical element design is used, then high quality and high stability light emission can be achieved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent replaces complex mechanical optical element design with a simplified light guide component that uses basic optical principles (light reflection and refraction) to achieve high light quality, thereby improving manufacturing efficiency
4Ease of manufacture
If stray light is not blocked, then the manufacturing process is simpler, but sensing accuracy decreases due to light spot images appearing in incorrect positions
Solution Approach 1:
The patent extracts and blocks stray light paths using a light shielding component that selectively absorbs or redirects light that does not follow the intended path, preventing it from reaching the sensor and causing false readings, while maintaining manufacturing simplicity
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 reduces production costs, improves yield, and enhances sensing stability by minimizing stray light interference and misjudgment, allowing for lower-cost, miniaturized, and more accurate optical tracking.
Implementation Method 1
a diffusion film and a light shielding layer. The diffusion film overlaps the sensing light source
Implementation Method 2
The light shielding layer of the light diffuser can provide a light shielding effect, which can block unexpected light exit regions and absorb stray light
Data Source
AI summary
An optical tracking device includes a circuit substrate, a sensing light source, and a light diffuser. The sensing light source is electrically connected to the circuit substrate and configured to emit sensing light. The sensing light source is disposed between the light diffuser and the circuit substrate. The light diffuser includes a diffusion film and a light shielding layer. The diffusion film overlaps the sensing light source. The light shielding layer is disposed on the diffusion film and includes a transparent pattern. The transparent pattern overlaps the sensing light source.