Eight-Lens Camera Optical Lens with Free-Form Surfaces
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Solution Overview
Problem
Conventional camera lenses face challenges in achieving ultra-thinness and wide-angle capabilities with insufficient refractive power distribution, lens spacing, and lens shape settings, leading to suboptimal imaging quality, particularly in night scene photography and background blur.
Innovation Solution
A camera optical lens design incorporating multiple lenses with free-form surfaces, including at least one negative and one positive refractive power lens, optimized through specific curvature radius and thickness ratios to correct aberrations and enhance imaging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lens structures are used, then manufacturing and design are simpler, but imaging quality and aberration correction are insufficient
Solution Approach 1:
The patent applies free-form surfaces which are non-rotationally symmetric surfaces to replace conventional rotationally symmetric aspherical surfaces. This asymmetry principle allows for better aberration correction and improved imaging quality by providing more degrees of freedom in surface design, particularly for wide-angle and ultra-wide-angle lenses where conventional symmetric designs fail to adequately correct off-axis aberrations
Solution Approach 2:
The patent employs multiple lenses with specific refractive power distributions (−+++−−+− or −−++−++− configurations) and optimized curvature radius and thickness ratios. By changing the parameters of refractive powers, curvature radii, and thicknesses of individual lenses, the system achieves superior aberration correction and imaging performance while maintaining ultra-thinness and wide-angle capabilities
2Manufacturing precision
If more lenses are added to improve imaging quality, then aberration correction improves, but lens thickness increases
Solution Approach 1:
The patent applies free-form surfaces specifically to certain lens elements where they provide the most benefit for aberration correction, rather than applying them uniformly across all lenses. This local quality principle allows for targeted aberration correction in critical regions while maintaining overall lens thinness, as free-form surfaces are particularly effective at correcting off-axis aberrations in wide-angle designs
Solution Approach 2:
The patent optimizes the refractive power distribution across eight lenses with specific configurations (−+++−−+− or −−++−++−), and carefully controls the curvature radius and thickness ratios of each lens element. By precisely adjusting these parameters, the system achieves effective aberration correction with an ultra-thin overall profile, preventing excessive thickness increase despite using multiple lens elements
3Manufacturing precision
If free-form surfaces are used, then aberration correction improves, but manufacturing difficulty increases
Solution Approach 1:
The patent adopts free-form surfaces which are non-rotationally symmetric surfaces to better balance aberrations and improve imaging quality, especially in wide-angle and ultra-wide-angle lens designs. The patent acknowledges that processing of free-form surfaces has been gradually mature, indicating that while manufacturing complexity increases, modern manufacturing capabilities are making this increasingly feasible
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 excellent optical performance with a wide angle and ultra-thinness, effectively correcting aberrations and improving image quality, making it suitable for high-pixel imaging devices like smartphones and web cameras.
Implementation Method 1
At least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, or the eighth lens has a free-form surface
Data Source
AI summary
A camera optical lens includes, from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. At least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, or the eighth lens has a free-form surface. The first lens has a negative refractive power, and the third lens has a positive refractive power, an object-side surface of the second lens is convex at a paraxial position, and an image-side surface of the eighth lens is concave at the paraxial position. The camera optical lens has a wide angle and ultra-thinness, as well as excellent optical performance.