7-Element Camera Lens 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 conditions for the focal lengths, refractive powers, and curvature radii of each lens element, including a combination of plastic and glass materials, to achieve an ultra-thin and wide-angle lens with improved imaging quality and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the pixel size of photosensitive devices is reduced, then the miniaturization of camera lenses is improved, but the imaging quality deteriorates
Solution Approach 1:
The camera lens is divided into multiple lens elements (at least 6 pieces) with different optical functions. Each lens element is optimized for specific aberration correction, allowing the compact lens to maintain high imaging quality despite reduced overall size. The segmentation of optical functions across multiple elements enables precise control of light paths in a miniaturized form factor.
Solution Approach 2:
The patent employs composite material construction by combining plastic lens elements and glass lens elements. Plastic elements provide lightweight, cost-effective manufacturing for certain optical functions, while glass elements offer superior optical properties for critical aberration correction. This composite approach enables the miniaturized lens to achieve high imaging quality that would be difficult with single-material construction.
2Measurement precision
If the lens structure is made more complex to improve imaging quality, then the imaging quality is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple optical functions into a compact multi-element lens structure where each element serves specific purposes. By combining aberration correction, focusing, and aperture control functions into an integrated 6+1 lens configuration, the design achieves high imaging quality without proportionally increasing overall device complexity. The merging of functions is optimized through careful selection of lens element positions and parameters.
Solution Approach 2:
Different lens elements are assigned specific local optical qualities and functions. Certain elements are optimized for spherical aberration correction, others for chromatic aberration, and others for coma correction. This local optimization of quality in specific regions of the lens system allows complex imaging requirements to be met without uniformly increasing the complexity of the entire lens structure.
3Length of moving object
If the total optical length is reduced for ultra-thin design, then the lens thickness is reduced, but the aberration correction capability deteriorates
Solution Approach 1:
The lens design employs dynamic optimization of the optical path through carefully controlled spacing and positioning of lens elements. The air gaps between elements are precisely designed to enable effective aberration correction within the constrained total optical length. This dynamic arrangement of elements allows the ultra-thin lens to achieve aberration correction capability that would normally require longer optical paths.
Solution Approach 2:
The patent utilizes parameter changes in the lens elements, including varying refractive indices, curvature radii, and thicknesses, to achieve effective aberration correction within a short total optical length. By optimizing these parameters across multiple elements, the design compensates for the reduced overall length and maintains high correction capability for spherical, chromatic, and coma aberrations.
4Measurement precision
If more lens elements are added to correct chromatic aberration, then the chromatic aberration correction is improved, but the manufacturing cost increases
Solution Approach 1:
The patent applies local quality optimization by using glass lens elements specifically at positions where chromatic aberration correction is most critical, while using plastic elements for other functions. This selective material assignment achieves effective chromatic aberration correction without requiring all elements to be expensive glass, thereby controlling manufacturing costs while maintaining high correction performance.
Solution Approach 2:
The mixed plastic and glass construction enables cost-effective chromatic aberration correction. Glass elements provide superior dispersion properties for chromatic correction at critical positions, while plastic elements handle other optical functions more economically. This composite material strategy achieves high chromatic aberration correction performance without the prohibitive cost of an all-glass lens system.
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 optical lens with excellent optical characteristics, fully corrected on-axis and off-axis chromatic aberrations, and a short total optical length, maintaining miniaturization characteristics while enhancing imaging performance.
Implementation Method 1
the first lens L1 has a negative refractive power; the second lens L2 has a positive refractive power; the third lens L3 has a positive refractive power
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.