Seven-Element Optical Imaging Lens for Compact, Large-Aperture Imaging
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Solution Overview
Problem
Conventional camera lenses on portable electronic devices face challenges in miniaturization while maintaining high imaging quality, especially under dim light conditions, due to large F numbers and increased size requirements for improved image quality and sharpness.
Innovation Solution
An optical imaging lens design with specific lens configurations, including glass and plastic aspheric lenses, that achieves miniaturization, large aperture, and high imaging quality by optimizing focal powers and shapes, reducing overall size, and correcting aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the F number is reduced to improve imaging quality under dim light conditions, then the aperture size increases, but the overall lens size increases
Solution Approach 1:
The patent employs aspheric surfaces on multiple lens elements (first, third, fourth, and sixth lenses) to optimize light gathering and reduce spherical aberration. This allows the lens to achieve better imaging quality with a compact form factor by efficiently controlling light paths without requiring a larger aperture
Solution Approach 2:
The lens system combines different materials including glass and plastic lens elements with specific refractive indices and Abbe numbers. This composite approach allows optimization of light transmission and aberration correction while maintaining a compact overall size, enabling reduced F number without proportionally increasing lens volume
2Volume of moving object
If the lens is miniaturized to meet portable device requirements, then the lens size decreases, but the imaging quality deteriorates
Solution Approach 1:
The lens system is divided into seven distinct lens elements with alternating positive and negative optical powers. This segmentation allows each element to be optimized for specific aberration corrections while maintaining a compact overall structure. The distributed design enables complex optical functions to be achieved within a reduced total length
Solution Approach 2:
Multiple aspheric surfaces are implemented across different lens elements to correct various aberrations including spherical aberration, coma, and distortion. These aspheric profiles enable high imaging quality in a miniaturized format by precisely controlling light rays throughout the compact optical path
3Manufacturing precision
If more lens elements are added to improve imaging quality, then the optical performance improves, but the overall lens length increases
Solution Approach 1:
The lens system employs a dynamic balance of positive and negative optical powers across the seven elements. The alternating sign pattern allows for compact folding of the optical path, where negative elements compress the overall length while positive elements provide the necessary focusing power, achieving high performance in a short total optical length
Solution Approach 2:
Multiple optical functions including focusing, aberration correction, and field curvature control are merged into a compact seven-element design. The close spacing and integrated design of elements allow these functions to be performed within a reduced total optical length compared to traditional designs
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 provides clear imaging with a large aperture, suitable for portable electronic devices, effectively improving user experience and imaging quality under various lighting conditions.
Implementation Method 1
An optical imaging lens comprises, from an object side to an image side in sequence: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens
Data Source
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AI summary
Disclosed are an optical imaging lens (100) and an imaging device, which relate to the technical field of optical lenses. The optical imaging lens (100) successively comprises, from an object side to an image side along an optical axis (A): a first lens (L1) with a positive focal power, with an object side surface thereof being a convex surface and an image side surface being a concave surface; a second lens (L2) with a negative focal power; a third lens (L3) with a positive focal power; a fourth lens (L4) with a negative focal power, with an object side surface thereof being a concave surface at a paraxial position and an image side surface being a convex surface at the paraxial position; a fifth lens (L5) with a negative focal power, with an image side surface thereof being a concave surface at the paraxial position; a six lens (L6) with a positive focal power; and a seventh lens (L7) with a negative focal power, with an object side surface and an image side surface thereof being both concave surfaces at the paraxial position. By means of rationally combining the lens shapes and focal power of various lenses, the optical imaging lens (100) and the imaging device have the advantages of a large aperture and a high imaging quality.