7-Element Camera Lens Design for Wide-Angle Imaging
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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 materials and refractive power conditions for each lens element, including plastic and glass lenses, to achieve ultra-thin and wide-angle capabilities while minimizing chromatic aberration, featuring a focal length ratio and refractive power distribution that enhances imaging quality and reduces sensitivity.
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 simpler and easier to manufacture, but the imaging quality and chromatic aberration correction are insufficient
Solution Approach 1:
The lens system is divided into seven distinct lens elements (L1-L7) with different materials and optical properties. Each lens element is optimized for specific functions: L1 and L2 form a negative-positive compound lens for wide-angle correction, L3 and L4 correct chromatic aberrations, L5 provides positive refractive power, and L6 and L7 fine-tune optical characteristics. This segmentation allows complex optical correction while maintaining manageable manufacturing through standardized assembly processes.
2Manufacturing precision
If more lens elements are added to improve imaging quality, then chromatic aberration correction improves, but the lens thickness increases
Solution Approach 1:
The patent employs extreme variations in refractive index parameters across lens elements. High-refractive-index materials (n=1.8211, 2.0018) are used for L3 and L4 to maximize chromatic aberration correction within minimal thickness. The negative refractive power of L1 (f1/f between -10 and -3) and the specific curvature radii ratios create compact optical paths that reduce overall lens thickness while maintaining correction effectiveness.
Solution Approach 2:
Lens elements are arranged in a nested configuration where L1 and L2 form an integrated negative-positive compound lens, and subsequent elements are positioned closely together with minimal spacing. The seventh lens L7 is positioned adjacent to the image surface, creating a compact nested structure that minimizes total optical path length while maintaining seven distinct optical correction stages.
3Adaptability or versatility
If the focal length of the first lens is increased, then the wide-angle capability improves, but the refractive power distribution becomes less effective for aberration correction
Solution Approach 1:
The lens system employs asymmetric refractive power distribution rather than uniform correction. The first lens L1 has strong negative refractive power (f1/f between -10 and -3) to enable wide-angle capability, while subsequent lenses L2-L7 have progressively adjusted positive and negative powers to compensate for the asymmetry introduced by L1. This asymmetric design allows wide-angle performance while maintaining aberration correction through balanced optical path management.
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 corrected aberrations, maintaining miniaturization characteristics and providing excellent optical characteristics, including wide-angle and ultra-thin features, with on-axis and off-axis chromatic aberrations fully corrected.
Implementation Method 1
from the object side to the image side, the camera optical lens comprises in sequence: a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), a fifth lens (L5), a sixth lens (L6) and a seventh lens (L7)... the first lens (L1) has a negative refractive power, the second lens (L2) has a positive refractive power, the third lens (L3) has a negative refractive power
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.