Asymmetric Micro Lens Diffuser for Face Recognition Beam Shaping
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Solution Overview
Problem
Current face recognition systems require a diffuser with an asymmetric light output pattern to accurately scan faces, particularly due to the vertical dominance of facial features, which existing diffusers fail to provide effectively, impacting recognition accuracy and efficiency.
Innovation Solution
A diffuser with a micro lens array featuring micro lenses having different horizontal and vertical lengths, and a manufacturing method involving photoresist layers and masks with varying beam angles to create an asymmetric light output pattern, enhancing yield and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional diffuser with symmetric light output pattern is used, then the manufacturing process is simple, but the face recognition accuracy deteriorates because the entire face cannot be scanned effectively
Solution Approach 1:
The patent applies asymmetry by designing a diffuser with an asymmetric light output pattern where the vertical beam angle (first beam angle) is different from the horizontal beam angle (second beam angle). This asymmetric design allows the laser beam to cover the entire vertical extent of the face more effectively, improving face recognition accuracy while maintaining manufacturing simplicity through a single diffuser structure.
2Productivity
If the beam angles are adjusted to match facial dimensions, then the face recognition efficiency improves, but the device complexity increases
Solution Approach 1:
The patent applies local quality by creating a diffuser structure where different regions have different optical properties - specifically, the diffuser has different beam angles in vertical and horizontal directions. This localized differentiation of optical characteristics enables the beam spread to match facial dimensions without requiring multiple separate optical components, thus improving efficiency while controlling complexity.
3Ease of manufacture
If a single diffuser structure is used, then the manufacturing cost is reduced, but the ability to provide asymmetric light output pattern is limited
Solution Approach 1:
The patent applies universality by designing a single diffuser structure that performs multiple functions: it simultaneously provides asymmetric beam spreading in both vertical and horizontal directions, and can be manufactured using conventional processes. This single-component solution achieves the asymmetric light output pattern capability without requiring multiple separate optical elements, thereby reducing manufacturing cost while maintaining adaptability.
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 diffuser emits laser beams with an asymmetric light output pattern, improving face recognition accuracy by matching the beam spread to facial dimensions, thereby increasing recognition efficiency and reducing manufacturing expenses.
Implementation Method 1
a diffuser that forms an asymmetric light output pattern by diffusing laser beams received from a laser source
Implementation Method 2
forming a plurality of voids, which corresponds to the mask pattern, in the photoresist layer by irradiating the mask with the diffused light
Data Source
AI summary
The present invention relates to a diffuser and a method of manufacturing the same, and more particularly, to a diffuser and a method of manufacturing the same, in which light emitted through the diffuser forms an asymmetric light output pattern. A diffuser according to an exemplary embodiment is a diffuser that forms an asymmetric light output pattern by diffusing laser beams received from a laser source, the diffuser including: a base; and a micro lens array disposed on the base, in which the micro lens array has a plurality of micro lenses each comprising a lower surface and a curved surface disposed on the lower surface, and the lower surface has horizontal and vertical lengths different from each other.