Seven-Lens Optical System Aberration Correction
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Solution Overview
Problem
Existing camera lenses with seven pieces are restricted by structure, limiting their ability to correct senior aberrations such as spherical aberration, which hampers imaging performance, especially in miniaturized camera systems with high resolution and wide-angle requirements.
Innovation Solution
A photographic optical system comprising seven plastic lenses with specific refractive powers and surface shapes, including a combination of positive and negative lenses with aspherical surfaces, optimized to correct spherical aberration and reduce chromatic aberration and field curvature, while maintaining miniaturization and high sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a seven-piece lens structure is used, then the device can be miniaturized, but the ability to correct spherical aberration is limited
Solution Approach 1:
The patent applies aspherical surfaces to multiple lens elements (first, third, fifth, and seventh lenses) to correct spherical aberration. The aspherical shape allows the lens to focus light more accurately across the entire field of view, resolving the contradiction between miniaturization and aberration correction by achieving superior optical performance within a compact seven-piece structure.
Solution Approach 2:
The patent optimizes various parameters including refractive indices, curvature radii, and thicknesses of individual lens elements to achieve effective aberration correction. By carefully selecting and adjusting these parameters across the seven-piece lens system, the design achieves high imaging quality while maintaining a miniaturized form factor.
2Measurement precision
If pixel size is reduced to achieve higher resolution, then imaging detail increases, but the lens requires better optical performance that is difficult to achieve
Solution Approach 1:
The aspherical surfaces on multiple lens elements enable effective correction of spherical aberration, which is critical for maintaining sharp images across the entire field of view. This allows the lens to deliver high resolution even when paired with small pixel sizes, as the aspherical geometry ensures consistent focus quality from center to edge.
Solution Approach 2:
The patent employs different optical materials with varying refractive indices and dispersion characteristics for different lens elements. This composite approach allows optimization of chromatic aberration correction and overall optical performance, enabling high resolution imaging while managing the increased complexity of correcting multiple aberration types.
3Device complexity
If the lens structure is simplified to reduce complexity, then manufacturing is easier, but senior aberration correction is insufficient
Solution Approach 1:
By incorporating aspherical surfaces into the lens design, the patent achieves effective spherical aberration correction without requiring a complex number of lens elements. The aspherical geometry provides a powerful means of aberration control that works within the constraints of a relatively simple seven-piece structure, balancing manufacturing feasibility with optical performance.
Solution Approach 2:
The patent applies different surface shapes and optical characteristics to different lens elements based on their specific functions within the system. Each lens element is designed with localized optical properties optimized for its position and role, allowing effective aberration correction across the entire field of view while keeping the overall structure manageable and manufacturable.
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 system achieves improved imaging performance with reduced aberrations, enabling high sensitivity and wide-angle capabilities in low illumination conditions, while maintaining a compact design.
Implementation Method 1
a first lens (10), a second lens (20), a third lens (30), a fourth lens (40), a fifth lens (50), a sixth lens (60) and a seventh lens (70) installed coaxially and lined up from an object side a to an image side b in turn
Data Source
AI summary
The present invention discloses a photographic optical system which includes a first lens (focal length f1), a second lens (focal length f2), a third lens (focal length f3), a fourth lens (focal length f4), a fifth lens (focal length f5), a sixth lens (focal length f6) and a seventh lens (focal length f7). The photographic optical system disclosed in the present invention by optimizing rationally face shape, distributing focal power, selecting optical material, is designed as a big relative aperture photographic optical system, and can provide the imaging performance in low illumination environment.