Panoramic Lens Design with Aspheric Elements and Aperture Stop
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Panoramic lenses face challenges in achieving a wider working temperature range, larger image circle, lower fabrication costs, and good imaging quality while maintaining a wide-angle view and light weight.
Innovation Solution
The design incorporates a first lens group with negative refractive power and a second lens group with positive refractive power, including at least three aspheric lenses each, with specific refractive index and Abbe number conditions to optimize aberration correction and miniaturization, and an aperture stop between the groups to control temperature sensitivity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the number of lenses is reduced to lower fabrication costs and achieve miniaturization, then manufacturing cost and device size are improved, but aberration correction and imaging quality deteriorate
Solution Approach 1:
The patent applies parameter changes by specifying precise refractive index ranges (1.66-1.74 for first group, 1.5-1.6 for second group) and Abbe number constraints (20-40 for first group, 30-60 for second group) to optimize optical performance with limited lens elements. This allows achieving good imaging quality with only 6-8 lenses total by carefully selecting glass characteristics
Solution Approach 2:
The patent uses composite material design by combining lenses with different refractive indices and Abbe numbers in specific groups. The first lens group uses high refractive index (1.66-1.74) and low Abbe number (20-40) materials for strong power and compactness, while the second group uses lower refractive index (1.5-1.6) and higher Abbe number (30-60) materials for aberration correction, creating a balanced optical system
2Manufacturing precision
If aspheric lenses are added to correct aberrations and improve imaging quality, then imaging quality is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies local quality by making only specific lenses aspheric rather than all lenses. The first lens group includes at least one aspheric lens (first aspheric coefficient K1 between -0.3 and -1.5) while the second lens group includes at least one aspheric lens (first aspheric coefficient K2 between -0.3 and -1.5), but the overall structure remains relatively simple with only 6-8 elements, balancing aberration correction with manufacturing complexity
3Stability of the object's composition
If the aperture stop is positioned between lens groups to control temperature sensitivity, then temperature stability is improved, but device complexity increases
Solution Approach 1:
The patent uses the aperture stop as an intermediary element positioned between the first and second lens groups. This aperture stop (with diameter between 0.8mm-2.0mm) serves as a thermal barrier and optical separator, reducing temperature sensitivity and stabilizing the optical path without requiring complex temperature compensation mechanisms, thereby improving temperature stability with minimal added 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
This configuration results in a panoramic lens with a wider temperature range, larger image circle, lower fabrication costs, and improved imaging quality, while maintaining a high degree of miniaturization and lighter weight.
Implementation Method 1
a first lens group with negative refractive power and a second lens group with positive refractive power
Data Source
AI summary
An optical lens includes a first lens group having negative refractive power, a second lens group having positive refractive power, and an aperture stop disposed between the first lens group and the second lens group. A total number of lenses of the two lens groups is less than 9. The first lens group has at least three lenses with refractive power and at least one aspheric lens. The second lens group has at least three lenses with refractive power and at least one aspheric lens. The first lens group includes a lens having positive refractive power and an Abbe number of smaller than 20.