7-Element Camera Lens Design for Miniaturization and 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 focal lengths, refractive indices, and curvature radii for each lens, optimized to achieve ultra-thin and wide-angle capabilities while correcting aberrations, using a combination of plastic and glass materials and an optical filter to minimize total optical length and 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 device complexity is reduced, but the imaging quality and chromatic aberration correction are insufficient
Solution Approach 1:
The lens system is divided into seven distinct lens elements with specific positive and negative refractive powers. This segmentation allows each element to correct specific types of optical aberrations, achieving superior imaging quality and chromatic aberration correction compared to simpler three-piece or four-piece structures.
Solution Approach 2:
The patent employs a combination of plastic and glass materials for different lens elements. Specifically, some lenses use plastic material while others use glass material, allowing optimization of each element's optical properties for chromatic aberration correction and overall system performance.
2Length of moving object
If the total optical length is reduced for miniaturization, then the device size is reduced, but the optical performance and aberration correction deteriorate
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element including focal length ratios (0.3≤f2/f≤−2.0, 0.8≤f3/f≤2.5), refractive indices (1.6≤n4≤2.0, 1.8≤n5≤2.2), and curvature radius relationships. These parameter optimizations enable ultra-thin design while maintaining excellent optical performance and aberration correction.
Solution Approach 2:
The patent introduces aspherical surfaces on multiple lens elements (first, second, third, fourth, sixth, and seventh lenses) to correct optical aberrations in a different dimensional approach. The aspherical coefficients provide additional degrees of freedom for aberration control without increasing the total optical length.
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 7-piece lens design achieves high performance with low total optical length, maintaining miniaturization characteristics and effectively correcting on-axis and off-axis chromatic aberrations, resulting in excellent imaging quality and optical characteristics.
Implementation Method 1
from the object side to the image side, the camera optical lens comprises in sequence: an aperture, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens
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.