7-Element Camera Lens Design for Wide-Angle Aberration Correction
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Solution Overview
Problem
There is a need for ultra-thin wide-angle camera lenses with good optical characteristics and fully corrected chromatic aberration, particularly for handheld devices like smartphones and digital cameras, where the shrinking pixel size of photosensitive devices and increasing demand for better imaging quality require more complex lens structures.
Innovation Solution
A 7-piece camera optical lens design is proposed, with specific materials and refractive indices for each lens element, along with precise curvature radii and thicknesses, to achieve ultra-thin and wide-angle capabilities while correcting aberrations, including the use of aspherical surfaces and inflexion points to enhance imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a three-piece or four-piece lens structure is used, then the lens can be simpler in structure, but the imaging quality and chromatic aberration correction are insufficient
Solution Approach 1:
The lens is divided into seven separate lens elements (L1-L7) with different materials and optical properties. Each lens element is optimized independently to correct specific aberrations, with alternating positive and negative refractive powers to achieve comprehensive chromatic and monochromatic aberration correction while maintaining good imaging quality across the entire field of view.
2Adaptability or versatility
If the focal length is reduced to achieve wide-angle capability, then the field of view increases, but the total optical length increases and chromatic aberration becomes more difficult to correct
Solution Approach 1:
The lens employs asymmetric design in multiple aspects: the first lens element L1 has different curvature radii on object-side (R1) and image-side (R2) surfaces; the second lens element L2 has asymmetric curvatures (R3, R4); and the overall lens configuration uses asymmetric distribution of positive and negative power elements. This asymmetric design enables wide-angle capability with controlled total optical length and effective chromatic aberration correction.
Solution Approach 2:
The lens uses precise control of optical parameters including focal lengths of individual elements (f1 through f7), curvature radii (R1 through R14), thicknesses (d1 through d7), and refractive indices (n1 through n7) to achieve the desired wide-angle field of view while maintaining compact total optical length and correcting chromatic aberration through the specific parameter combinations of the seven lens elements.
3Volume of moving object
If the pixel size of photosensitive devices shrinks, then the device can be more miniaturized, but the requirement for imaging quality and chromatic aberration correction increases
Solution Approach 1:
The lens uses composite material construction with seven different lens elements made from materials with different refractive indices and dispersion properties. This composite approach enables effective chromatic aberration correction by combining materials that complement each other's optical characteristics, achieving high imaging quality in a miniaturized form factor suitable for shrinking pixel size applications.
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 results in a camera lens with excellent optical characteristics, fully corrected on-axis and off-axis chromatic aberrations, and a minimized total optical length, maintaining miniaturization characteristics and improving image quality.
Implementation Method 1
the object side surface of the first lens is a convex surface relative to the proximal axis, and the image side surface is a concave surface relative to the proximal axis, both being aspherical surfaces
Implementation Method 2
each of the aspherical surfaces has at least one inflexion point, and the inflexion points of the aspherical surfaces are located outside a region enclosed by a two times radius of the entrance pupil
Data Source
AI summary
The present disclosure discloses a camera optical lens. The camera optical lens includes, in an order 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 and a seventh lens. The camera optical lens further satisfies specific conditions.