Five-Lens Optical System Design for Compact Imaging
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Solution Overview
Problem
Current optical lenses face challenges in achieving miniaturization, high optical performance, wide viewing angles, low thermal shift, reduced fabrication costs, and improved imaging quality while maintaining a compact design.
Innovation Solution
The optical lens design incorporates a first lens group with three lenses, including a spherical and aspheric lens, and a second lens group with positive refractive power, along with an aperture stop, optimizing the number of lenses to less than 9 and adhering to specific diameter and length conditions to achieve high optical performance and reduced thermal shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to improve optical performance, then imaging quality is improved, but device complexity and fabrication costs increase
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, Abbe numbers, and curvature radii of each lens element. Specifically, it defines precise mathematical relationships between these parameters (e.g., -5.0 < f1/f < -2.0, 30 < v1 < 50) to achieve high imaging quality with only 5-6 lenses, resolving the contradiction between quality and complexity
Solution Approach 2:
The patent uses composite lens designs combining materials with different Abbe numbers (e.g., high dispersion and low dispersion materials) to correct chromatic aberrations. This allows achieving superior optical performance with fewer lens elements by maximizing the effectiveness of each material used
2Measurement precision
If the number of lenses is increased to improve optical performance, then resolution is improved, but fabrication costs increase
Solution Approach 1:
The patent optimizes manufacturing parameters by defining specific ranges for curvature radii, thicknesses, and refractive powers that balance optical performance with manufacturability. The design allows achieving high resolution with fewer lenses, directly reducing fabrication costs while maintaining performance
Solution Approach 2:
The patent employs aspheric lens surfaces to correct spherical aberrations and improve resolution. The aspheric coefficients are carefully controlled within specific ranges to ensure both high resolution and ease of manufacturing using conventional molding techniques
3Length of stationary object
If the total track length is decreased to achieve miniaturization, then occupied space is reduced, but optical performance may deteriorate
Solution Approach 1:
The patent achieves compactness by optimizing the lateral dimensions and spacing between lens elements rather than simply reducing axial length. The design maintains adequate optical performance by carefully controlling the relative positions and diameters of lenses within the constrained total track length
Solution Approach 2:
The patent defines specific parameter ranges for lens spacing, diameters, and powers that enable miniaturization while preserving optical performance. The mathematical relationships between parameters ensure that performance requirements are met even with reduced total track length
4Illumination intensity
If the effective aperture is increased to improve light gathering, then viewing angles are improved, but thermal shift increases
Solution Approach 1:
The patent controls thermal shift by selecting materials with appropriate thermal expansion coefficients and Abbe numbers, and by defining specific ranges for lens powers and spacings that compensate for thermal effects. The design maintains stable optical performance across temperature variations even with large effective aperture
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
This configuration results in an optical lens with high resolution, wide viewing angles, low thermal shift, reduced occupied space, and lower fabrication costs, while maintaining good imaging quality and a compact form factor.
Implementation Method 1
The second lens and the fifth lens are aspheric lenses
Implementation Method 2
the three lenses include a spherical lens and an aspheric lens
Data Source
AI summary
An optical lens includes a first lens group, a second lens group and an aperture stop. The first lens group includes three lenses with refractive powers. The second lens group has a positive refractive power and includes two lenses with refractive power. The aperture stop is disposed between the first lens group and the second lens group. The optical lens satisfies the conditions of 2 mm<DL<6 mm, LT<15 mm and 0.2<DL/LT<0.38, where DL is a diameter of a lens surface of the second lens group furthest from the first lens group, and LT is a length measured on the optical axis between two outermost lens surfaces of the optical lens.