Six-Lens Optical Assembly for TOF Miniaturization
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Solution Overview
Problem
Existing optical lens assemblies for time-of-flight technology face challenges in miniaturization, which limits aperture size and light collection rate, affecting performance and accuracy in scene modeling.
Innovation Solution
The optical lens assembly comprises six lenses with refractive power, including a stop, with specific surface configurations and materials to achieve a balance between miniaturization and performance, enhancing light capture and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the lens module is reduced for miniaturization, then the lens module becomes more compact and suitable for mobile devices, but the aperture size is limited which reduces the light collection rate and affects TOF performance
Solution Approach 1:
The lens assembly is divided into six individual lenses with specific refractive powers arranged in sequence. Each lens contributes to the overall optical function, allowing the system to achieve both compact size and adequate light collection through distributed optical elements rather than a single large aperture lens.
Solution Approach 2:
The patent employs a multi-lens configuration that extends the optical path in the longitudinal dimension while maintaining a compact transverse profile. By stacking six lenses along the optical axis with controlled spacing, the system achieves extended focal length and improved light collection without increasing the lateral footprint of the lens module.
2Illumination intensity
If the aperture size is increased to improve light collection rate, then the light collection rate improves, but the lens module size increases which conflicts with miniaturization requirements
Solution Approach 1:
Instead of using a single large aperture lens, the system segments the optical function across six smaller lenses. Each lens has a smaller individual aperture, but collectively they achieve the required light collection rate through their combined optical path and focal length characteristics.
Solution Approach 2:
The patent optimizes specific parameters including the focal length of each lens (f1 through f6), the spacing between adjacent lenses (T12, T34, T45, T2S), and the curvature radii of lens surfaces to achieve the desired balance between aperture size, light collection rate, and overall module compactness.
3Measurement precision
If more lenses are added to improve optical performance, then the light capture and image quality improve, but the device complexity increases
Solution Approach 1:
The optical system is segmented into six distinct lenses with specific refractive powers (positive, negative, positive, positive, positive, positive) arranged in a predetermined sequence. Each lens is designed with specific surface characteristics (spherical or aspheric) to contribute to correcting optical aberrations and improving image quality in a modular fashion.
Solution Approach 2:
Different regions of the lens assembly have different optical characteristics. The first lens has a specific focal length and curvature, while subsequent lenses have varying refractive powers and surface shapes tailored to their specific positions in the optical path, optimizing performance at each stage while managing overall complexity.
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 design achieves a wide angle of view, improved light capture, and enhanced image quality, while maintaining a compact size, addressing the limitations of previous lens modules.
Implementation Method 1
a first lens with refractive power; a second lens with negative refractive power... a third lens with refractive power... a fourth lens with refractive power... a fifth lens with refractive power... a sixth lens with refractive power
Data Source
AI summary
An optical lens assembly includes a stop, and includes, in order from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; wherein a maximum field of view of the optical lens assembly is FOV, an entrance pupil diameter of the optical lens assembly is EPD, and the following condition is satisfied: 254.30<FOV*EPD<418.64.