Six-Element Camera Lens Design for 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, where the shrinking pixel size of photosensitive devices and increasing demand for high imaging quality require innovative lens designs that balance refractive power and aberration correction.
Innovation Solution
A six-piece camera optical lens design is proposed, comprising lenses made of glass and plastic materials, with specific refractive power and curvature radius conditions to achieve ultra-thin and wide-angle capabilities, including the arrangement of an optical filter between the sixth lens and the image surface, which helps in correcting aberrations and maintaining miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lens elements is increased to improve imaging quality, then the imaging quality improves, but the total optical length increases and the lens becomes thicker
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices (n1=1.7130, n2=1.6448, n3=1.5439, n4=1.6355, n5=1.5352, n6=1.7130) and Abbe numbers (ν1=53.87, ν2=22.44, ν3=55.95, ν4=23.97, ν5=56.12, ν6=53.87) of each lens element, along with specific curvature radii and thickness ratios, to achieve high imaging quality in a compact six-element design with TTL≤5.69mm
Solution Approach 2:
The patent uses composite materials by combining glass and plastic lens elements with different optical properties. Specifically, it alternates between high refractive index elements (n=1.7130, 1.6355) and lower refractive index elements (n=1.5439, 1.5352), creating a composite optical system that corrects aberrations while maintaining miniaturization
2Use of energy by moving object
If the aperture is increased to improve light gathering capability, then the light gathering capability improves, but the chromatic aberration becomes more severe
Solution Approach 1:
The patent introduces an optical filter as an intermediary element positioned between the sixth lens and the image surface. This filter acts as a mediator to correct chromatic aberration while allowing the aperture to maintain large light gathering capability (Fno≤2.27)
Solution Approach 2:
The patent controls the aperture F-number within a specific range (Fno≤2.27) and uses precise parameter optimization of all six lens elements to balance light gathering capability with chromatic aberration correction, achieving both large aperture and excellent color correction
3Length of moving object
If the lens is miniaturized to meet handheld device requirements, then the lens thickness decreases, but the optical characteristics deteriorate
Solution Approach 1:
The patent achieves miniaturization (TTL≤5.69mm) while maintaining excellent optical characteristics through precise parameter control, including specific thickness ratios (0.052≤d1/TTL≤0.2, 0.14≤d3/TTL≤0.45, 0.22≤d5/TTL≤0.68, 0.18≤d7/TTL≤0.59, 0.28≤d9/TTL≤0.92, 0.13≤d11/TTL≤0.41) and optical power distributions
Solution Approach 2:
Each lens element in the six-element design serves multiple functions: the first lens (positive power) provides primary focusing, the second lens (negative power) corrects spherical aberration, the third lens (positive power) contributes to chromatic correction, the fourth lens (negative power) further corrects aberrations, the fifth lens (positive power) enhances focusing, and the sixth lens (negative power) provides final aberration correction. This multi-functional design enables compact size with high optical quality
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 characteristics, fully correcting on-axis and off-axis chromatic aberrations, and maintains the miniaturization characteristics necessary for handheld devices, providing high-quality imaging with a short total optical length and large aperture.
Implementation Method 1
the lens that is traditionally equipped in mobile phone cameras adopts a three-piece or four-piece lens structure. And, with the development of technology and the increase of the diverse demands of users, and under this circumstances that the pixel area of photosensitive devices is shrinking steadily and the requirement of the system for the imaging quality is improving constantly, the five-piece, six-piece and seven-piece lens structure gradually appear in lens design. There is an urgent need for ultra-thin wide-angle camera lenses which have good optical characteristics and the chromatic aberration of which is fully corrected.
Implementation Method 2
A six-piece camera optical lens design is proposed, comprising lenses made of glass and plastic materials, with specific refractive power and curvature radius conditions
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 having a negative refractive power, a third lens having a positive refractive power, a fourth lens, a fifth lens, and a sixth lens. The camera optical lens further satisfies specific conditions.