7-Element Camera Lens Design for 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 to achieve ultra-thin and wide-angle capabilities while minimizing chromatic aberration, including the use of plastic and glass materials and an optical filter to optimize 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 can be manufactured with simpler processes, but the imaging quality and chromatic aberration correction are insufficient
Solution Approach 1:
The lens system is divided into seven separate lens elements with specific refractive powers and dispersion characteristics. Each element is optimized to correct specific types of aberrations, with the first element having negative refractive power and high dispersion, the second having positive refractive power and low dispersion, and subsequent elements having alternating signs of refractive power. This segmentation allows comprehensive correction of chromatic and monochromatic aberrations that cannot be achieved with fewer elements.
2Length of moving object
If the lens is made ultra-thin to meet handheld device requirements, then the device size is reduced, but the optical performance and aberration correction capability deteriorate
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element including focal lengths (f1 through f7), refractive powers (positive and negative), dispersion characteristics, and curvature radii. These parameters are optimized to achieve ultra-thin overall lens thickness while maintaining excellent optical performance. The conditional expressions define the relationships between parameters to ensure aberration correction is maintained despite reduced thickness.
3Volume of moving object
If the pixel size of photosensitive devices is shrunk to reduce device size, then the device becomes more compact, but the imaging quality and light gathering capability decrease
Solution Approach 1:
The seven-element lens structure with alternating positive and negative refractive powers enables comprehensive aberration correction that is critical for maintaining imaging quality with smaller pixels. The specific configuration with the first element having negative refractive power and high dispersion, followed by elements with alternating signs, allows correction of chromatic aberration and other optical defects that would be magnified with smaller pixel dimensions.
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 imaging with reduced sensitivity and corrected aberrations, maintaining miniaturization characteristics and enhancing the imaging quality of handheld devices.
Implementation Method 1
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
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.