Five-Lens Optical Imaging System Aberration Correction
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Solution Overview
Problem
Existing camera modules, particularly in mobile communications terminals and vehicles, face challenges in achieving a small size and high image quality while maintaining clear image capture in low-light conditions and across a wide field of view.
Innovation Solution
The optical imaging system comprises five sequentially disposed lenses with specific refractive powers and surface curvatures, including a first lens with a positive refractive power and concave object-side surface, a second lens with a positive refractive power and concave image-side surface, and a fifth lens with a negative refractive power and aspherical surfaces, optimized to achieve a balance of size, image quality, and low-light performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the camera module size is reduced to meet slimness requirements, then the device becomes more compact and suitable for mobile terminals and vehicles, but image quality and low-light performance deteriorate
Solution Approach 1:
The patent applies aspherical surfaces to the fifth lens (and optionally other lenses) to correct optical aberrations. The aspherical shape allows for better control of light rays across the optical field, maintaining high image quality and reducing aberrations despite the compact lens configuration. This curvature principle enables the small camera module to achieve diffraction-limited performance across the visible and near-infrared spectrum.
Solution Approach 2:
The patent specifies different material compositions for different lenses within the optical system. The first through fourth lenses use glass materials with specific refractive indices and Abbe numbers, while the fifth lens uses plastic material. This composite material approach allows optimization of each lens for its specific function while maintaining overall system compactness and performance.
2Area of stationary object
If the field of view is widened to capture more of the surrounding environment, then the coverage area increases, but aberration and image quality at the edges deteriorate
Solution Approach 1:
The aspherical surfaces on the fifth lens (and potentially other lenses) are specifically designed to correct off-axis aberrations. The varying curvature of the aspherical surfaces compensates for field curvature and distortion, maintaining sharp focus and accurate geometry across the entire wide field of view from center to edge.
Solution Approach 2:
The patent assigns different optical properties to different parts of the optical system. The fifth lens with aspherical surfaces provides localized correction for off-axis rays, while the spherical lenses (first through fourth) handle the bulk of the focusing. This local optimization ensures high image quality across the entire field of view.
3Ease of manufacture
If the lens system is simplified to reduce complexity and cost, then manufacturing becomes easier, but aberration correction and image quality performance worsen
Solution Approach 1:
The aspherical fifth lens provides powerful aberration correction in a single element, replacing what would otherwise require multiple additional lenses. This reduces the total lens count and system complexity while maintaining high image quality and diffraction-limited performance across the optical spectrum.
Solution Approach 2:
The patent optimizes specific optical parameters including the refractive indices and Abbe numbers of the glass lenses, the aspherical coefficients of the plastic fifth lens, and the spacing between elements. These parameter optimizations enable effective aberration correction with a minimal five-element design, balancing manufacturing simplicity with optical performance.
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
This configuration enhances aberration correction, maintains high resolution across a wide field of view, and allows for clear image capture in low-light conditions, while also being compact and cost-effective.
Implementation Method 1
a first lens L1 having a positive refractive power and a concave object-side surface S11
Data Source
AI summary
An optical imaging system includes five lenses in which a first lens includes a positive refractive power and a concave object-side surface, and a second lens includes a positive refractive power and a concave image-side surface. The first to fifth lenses are sequentially disposed from an object side to an image side.