Compact Structured Light Generation Lens Unit for Slim Mobile Devices
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Solution Overview
Problem
Current light source modules for generating collimated infrared light are bulky, making them unsuitable for modern slim-type mobile phones and wearable devices, and the omission of dust-proof lenses can alter optical path lengths and affect the collimating property.
Innovation Solution
A compact structured light generation apparatus with a lens unit that constructs multiple optical path lengths using a lens element with specific surface profiles and structures, including aspheric and lenticular lens arrays, to collimate and shape light beams effectively, and optionally includes a dust-proof plate to maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a traditional light source module is used to generate collimated infrared light, then the collimating function is achieved, but the volume becomes bulky and unsuitable for slim-type devices
Solution Approach 1:
The light source module is segmented into distinct functional components: a laser diode for light generation, a collimating lens for beam collimation, and a dust-proof lens for environmental protection. This segmentation allows each component to be optimized independently, reducing overall volume while maintaining collimating performance
Solution Approach 2:
The patent transitions from a bulky three-dimensional light source module to a thin-film or planar integrated structure by optimizing the optical path and component arrangement. The collimating lens and dust-proof lens are positioned in a compact configuration that minimizes the overall volume while maintaining the necessary optical path length for effective collimation
2Device complexity
If the dust-proof lens is omitted to reduce complexity, then the device becomes simpler, but the optical path length changes and collimating property deteriorates
Solution Approach 1:
The dust-proof lens is designed to serve dual functions: protecting the light source from environmental contaminants and maintaining the optical path length for proper collimation. This multi-functionality allows the component to contribute to both structural integrity and optical performance, reducing the need for additional components
Solution Approach 2:
The patent optimizes the parameters of the dust-proof lens, including its material refractive index, thickness, and curvature radius, to ensure that it maintains the correct optical path length while providing environmental protection. By carefully controlling these parameters, the lens preserves collimating properties even in simplified configurations
3Object-affected harmful factors
If the dust-proof lens is included to enhance stability, then the light source resistance to harsh environment improves, but the volume increases
Solution Approach 1:
The dust-proof lens is merged with the collimating lens or integrated into the same optical assembly, eliminating the need for separate protective components. This integration reduces the overall volume of the light source module while maintaining environmental resistance and optical performance
Solution Approach 2:
The dust-proof lens is designed as a thin-film structure that provides environmental protection with minimal thickness. This thin-film approach reduces the volume contribution of the protective component while maintaining its barrier function against dust and contaminants
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 apparatus provides flexible and compact 3D sensing capabilities for mobile devices, maintaining effective collimation and stability with or without a dust-proof lens, suitable for generating structured light for gesture recognition and scanning functions.
Implementation Method 1
The lens unit converts the light beam into a linear light beam. The lens unit includes a lens element with a first surface and a second surface. The first surface has a radius larger than 0.189 mm or has a diffracting function.
Implementation Method 2
The first surface has a radius larger than 0.189 mm or has a diffracting function
Implementation Method 3
a lens element with a first surface for collimating a visible or invisible laser beam and a second surface for shaping the collimated laser beam as a linear light beam
Implementation Method 4
Within the housing, the lens unit constructs a first optical path length and a second optical path length for the light beam. The first optical path length and the second optical path length are different.
Data Source
AI summary
An apparatus of structured light generation is equipped with a light source and a lens unit. The lens unit is installed in a compact housing of the apparatus of structured light generation. Moreover, the lens unit constructed two different optical path lengths within the housing. By the lens unit, light beams from the light source are collimated and converted into linear light beams. The linear light beams are locally overlapped or globally overlapped. Consequently, the light beam from the light source is shaped into a linear structured light or a linearly-overlapped structured light for detection.