7-Element Camera Lens Aberration Correction Miniaturization
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Solution Overview
Problem
There is a growing need for ultra-thin wide-angle camera lenses with improved optical characteristics and corrected chromatic aberration, particularly for handheld devices, as the pixel size of photosensitive devices shrinks and imaging quality demands increase, while existing lens structures face challenges in achieving both thinness and high performance.
Innovation Solution
A 7-piece camera optical lens design is proposed, with specific conditions for the focal lengths, refractive indices, and curvature radii of its components, ensuring a total optical length of less than 4.83 mm and an aperture F number of less than 1.85, which balances refractive power, aberration correction, and miniaturization, incorporating a combination of plastic and glass materials to optimize imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a three-piece or four-piece lens structure is used, then the device complexity is reduced, but the imaging quality deteriorates
Solution Approach 1:
The lens system is divided into seven distinct lens elements with specific optical powers and material properties. Each lens element (first through seventh lenses) serves specific optical functions, with the positive and negative optical powers distributed across different elements to correct various aberrations while maintaining overall system performance
2Length of stationary object
If the total optical length is reduced to achieve ultra-thin design, then the device miniaturization is improved, but the chromatic aberration correction deteriorates
Solution Approach 1:
The lens system employs composite material design with specific refractive index combinations. The first lens has refractive index 1.5<f1<2.0, the second lens 1.6<n2<2.2, and subsequent lenses have specified refractive ranges. This composite approach allows chromatic aberration correction within the ultra-thin total optical length constraint of 0.8<TTL<4.83mm
Solution Approach 2:
The patent applies parameter optimization by establishing specific mathematical relationships between lens parameters. Key parameters include focal length ratios (0.5<f1/f<2.0, -2.0<f2/f<0.5), curvature radius relationships, and thickness ratios (0.1<d1/TTL<0.5). These parameter constraints enable simultaneous achievement of miniaturization and aberration correction
3Measurement precision
If the aperture F number is reduced to improve light gathering, then the imaging quality is improved, but the device complexity increases
Solution Approach 1:
The aperture F number is optimized within the range 1.0<F<2.2 through parameter coordination across all seven lens elements. This parameter optimization achieves improved light gathering and imaging quality without requiring additional complex optical elements, as the existing seven-lens structure with specific power distribution and material properties enables the desired 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 high-performance imaging with reduced chromatic aberration and sensitivity, maintaining miniaturization characteristics, effectively addressing the need for ultra-thin and wide-angle lenses with improved optical characteristics.
Implementation Method 1
the focal length of the first lens is f1, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the refractive index of the second lens is n2
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.