Super-wide Angle Lens Design for Compact High-Resolution Imaging
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Solution Overview
Problem
There is a demand for compact super-wide angle lenses with high resolution suitable for high-pixel digital cameras that also prioritize fast auto-focusing and a compact size for easy portability, while maintaining excellent optical performance and correcting aberrations.
Innovation Solution
A super-wide angle lens design featuring a first lens with negative refractive power and a second lens with positive refractive power, arranged sequentially, along with additional lenses to achieve a half view angle of 80 degrees or greater, with specific constraints on focal lengths, radii of curvature, and aperture stop placement to ensure compactness and improved optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a super-wide angle lens with a half view angle of 80 degrees or greater is designed, then the angle of view is improved, but the lens size and complexity increase
Solution Approach 1:
The lens is divided into multiple lens elements with specific refractive powers arranged in sequence. The first lens has negative refractive power and the second lens has positive refractive power, creating a segmented structure that achieves super-wide angle view while controlling overall complexity through functional division of labor among elements.
Solution Approach 2:
Specific parameter constraints are applied to control the lens design: the ratio of combined focal length to entire focal length is constrained within 0.15>f/f12>−0.15, and the radius of curvature ratio (R2+R1)/(R2−R1) is constrained within −0.75>(R2+R1)/(R2−R1)>−1.50. These parameter changes enable achieving 80 degrees or greater half view angle while maintaining manageable lens complexity.
2Manufacturing precision
If multiple lenses are used to achieve high resolution and correct aberrations, then optical performance is improved, but the lens becomes larger and less portable
Solution Approach 1:
The lens system is segmented into a first lens with negative refractive power and a second lens with positive refractive power. This segmentation allows aberration correction through the interaction of opposite refractive powers while keeping the overall lens volume compact by using only two primary lens elements rather than more complex multi-element designs.
Solution Approach 2:
By constraining the ratio of combined focal length to entire focal length within 0.15>f/f12>−0.15 and the radius of curvature ratio within −0.75>(R2+R1)/(R2−R1)>−1.50, the design achieves high optical performance and aberration correction with a compact lens volume suitable for portability.
3Volume of moving object
If a compact lens design is pursued, then portability is improved, but achieving high resolution and fast auto-focusing becomes more difficult
Solution Approach 1:
The compact lens design segments functionality between a first lens with negative refractive power for wide-angle light gathering and a second lens with positive refractive power for focusing. This segmentation enables fast auto-focusing through coordinated movement of the lens elements while maintaining compact overall volume, and achieves high resolution through the complementary optical properties of the segmented elements.
Solution Approach 2:
By applying specific parameter constraints on focal length ratios (0.15>f/f12>−0.15) and radius of curvature ratios (−0.75>(R2+R1)/(R2−R1)>−1.50), the design achieves a compact lens volume that simultaneously maintains high resolution capability and fast auto-focusing performance through optimized optical parameters.
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 compact size with enhanced optical performance, including aberration correction and improved portability, suitable for high-pixel digital cameras, while maintaining a wide angle view and fast focusing capabilities.
Implementation Method 1
a first lens L1 having a negative refractive power and a second lens L2 having a positive refractive power, wherein the first lens and the second lens are disposed in sequential order from an object side to an image side
Data Source
AI summary
A super-wide angle lens and a photographing apparatus including the super-wide angle lens are provided. The super-wide angle lens includes a first lens having a negative refractive power and a second lens having a positive refractive power, wherein the first lens and the second lens are disposed in sequential order from an object side to an image side, and wherein the super-wide angle lens has a half view angle of 80 degrees or greater.