7-Element Camera Lens Design for Chromatic 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 refractive power and curvature radius conditions for each lens element, including materials like plastic and glass, to achieve ultra-thin and wide-angle capabilities while correcting aberrations, and an optical filter is placed between the seventh lens and the image surface to enhance imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a three-piece or four-piece lens structure is used, then the lens is simpler and easier to manufacture, but the imaging quality is insufficient and chromatic aberration is not fully corrected
Solution Approach 1:
The lens is divided into seven separate lens elements (first through seventh lenses) with specific refractive powers and focal lengths. Each lens element is independently designed with specific curvature radii and thickness ratios to correct various optical aberrations. This segmentation allows for precise control of light paths and effective correction of chromatic and spherical aberrations, achieving high imaging quality that cannot be obtained with simpler three-piece or four-piece structures.
2Manufacturing precision
If more lens elements are added to improve imaging quality, then chromatic aberration correction improves, but the total optical length increases and miniaturization is compromised
Solution Approach 1:
The patent employs precise parameter optimization for each lens element including focal length ratios (f1/f between -10 and -3.1, f4/f between -7 and -2.5), curvature radius relationships ((R1+R2)/(R1-R2) between 2 and 10), and thickness ratios (d1/TTL between 0.05 and 0.4). These parameter constraints enable the seven-element lens to achieve compact dimensions while maintaining effective chromatic aberration correction across the visible spectrum.
Solution Approach 2:
The patent utilizes aspherical surface design for multiple lens elements, introducing a third dimension of surface curvature control beyond traditional spherical surfaces. This allows for more efficient light path management and aberration correction within a reduced optical path length, enabling compact lens design with seven elements rather than requiring longer optical paths with fewer elements.
3Adaptability or versatility
If the lens is designed for wide-angle capability, then the field of view increases, but optical characteristics deteriorate and aberration correction becomes more difficult
Solution Approach 1:
The patent employs asymmetric curvature radius design where object-side and image-side surfaces of each lens element have different curvature characteristics. Specifically, the first lens has negative refractive power with asymmetric curvatures, the fourth lens has strong negative refractive power with asymmetric surfaces, and the seventh lens has asymmetric curvatures optimized for wide-angle performance. This asymmetric design enables effective control of off-axis light rays while maintaining good optical characteristics across the wide field of view.
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 a short total optical length, maintaining miniaturization characteristics, and effectively corrects on-axis and off-axis chromatic aberrations, providing excellent imaging quality and optical characteristics for handheld devices.
Implementation Method 1
an optical filter is placed between the seventh lens and the image surface to enhance imaging quality
Implementation Method 2
A 7-piece camera optical lens design is proposed, with specific refractive power and curvature radius conditions for each lens element
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 first lens is made of plastic material, the second lens is made of glass material, the third lens is made of plastic material, the fourth lens is made of glass material, the fifth lens is made of plastic material, the sixth lens is made of plastic material, and the seventh lens is made of plastic material. The camera optical lens further satisfies specific conditions.