7-Lens Camera Optical Lens for Miniaturized Chromatic Aberration Correction
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Solution Overview
Problem
The demand for ultra-thin wide-angle camera lenses with good optical characteristics and fully corrected chromatic aberration has increased, particularly for handheld devices like smartphones, where traditional lens structures struggle to achieve high imaging quality due to shrinking pixel sizes and the need for thinner, more compact designs.
Innovation Solution
A 7-lens camera optical lens structure is designed, with specific focal lengths, refractive indices, and curvature radii for each lens, optimized to minimize total optical length while maintaining high performance, using a combination of plastic and glass materials to correct spherical and chromatic aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lens elements is increased to improve imaging quality, then chromatic aberration correction is improved, but the total optical length increases and the lens becomes thicker
Solution Approach 1:
The patent applies parameter changes by carefully selecting and optimizing the refractive indices and Abbe numbers of each lens element. Specifically, the first lens has refractive index 1.545-1.640, the second lens has refractive index 1.660-1.700, and the seventh lens has refractive index 1.700-1.830. These parameter selections enable effective chromatic aberration correction while maintaining a compact total optical length of 4.30-6.50mm.
Solution Approach 2:
The patent employs composite materials by combining plastic lens elements (first through sixth lenses) with a glass lens element (seventh lens). This composite structure leverages the manufacturing advantages of plastic and the superior optical properties of glass to achieve both chromatic aberration correction and miniaturization. The different material properties enable effective dispersion control across the visible spectrum.
2Length of stationary object
If the lens is miniaturized to meet thin device requirements, then the total optical length is reduced, but chromatic aberration correction becomes more difficult
Solution Approach 1:
The patent divides the optical system into seven distinct lens elements with specific functional assignments. The first lens (positive power) and second lens (negative power) form an initial correcting group, while lenses three through six provide additional aberration control, and the seventh glass lens provides final chromatic correction. This segmentation allows distributed correction of chromatic aberrations across multiple interfaces, achieving effective correction in a miniaturized format with total optical length of 4.30-6.50mm.
Solution Approach 2:
The patent utilizes precise parameter control by specifying refractive indices and Abbe numbers for each lens element within narrow ranges. The seventh lens specifically uses glass material with refractive index 1.700-1.830 and Abbe number 20-30, which provides strong chromatic dispersion control. This parameter optimization enables effective chromatic aberration correction despite the reduced total optical length.
3Use of energy by moving object
If the aperture is increased to improve light gathering capability, then the F-number is reduced, but spherical aberration and other optical aberrations increase
Solution Approach 1:
The patent segments the optical power distribution across seven lens elements, with the first lens having focal length ratio f1/f = 0.15-0.35 and the second lens having f2/f = -0.10-0.20. This segmentation distributes the refractive workload, preventing any single element from introducing excessive spherical aberration even at wide apertures. The negative power second lens specifically helps counteract spherical aberration generated by the positive first lens.
Solution Approach 2:
The patent optimizes aperture performance by carefully controlling the F-number within 1.80-2.80 through parameter selection. The refractive indices of the first lens (1.545-1.640) and second lens (1.660-1.700) are selected to balance light gathering capability with aberration control. The curvature radii and thickness parameters are optimized to maintain spherical aberration control across the specified F-number range.
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 ultra-thin, wide-angle imaging with fully corrected on-axis and off-axis chromatic aberrations, maintaining excellent optical characteristics and miniaturization characteristics, enhancing imaging quality and reducing sensitivity.
Implementation Method 1
from the object side to the image side, the camera optical lens comprises in sequence: a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), a fifth lens (L5), a sixth lens (L6) and a seventh lens (L7)... the focal length of the first lens is f1... the refractive index of the seventh lens is n7
Implementation Method 2
the curvature radius of the object side surface of the seventh lens is R13, the curvature radius of the image side surface of the seventh lens is R14
Data Source
AI summary
The present disclosure discloses a camera optical lens. The camera optical lens including, 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.