Optical Imaging Lens Group Aberration Correction
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Solution Overview
Problem
Camera lenses in mobile devices suffer from low imaging quality, particularly in conditions of poor light and macro shooting, due to limitations in design and refractive power distribution.
Innovation Solution
An optical imaging lens group is designed with a specific configuration of lenses, including a first lens with positive refractive power, a second lens with a concave image-side surface, a third lens with refractive power, a fourth lens with a concave image-side surface, a fifth lens with refractive power, a sixth lens with a concave image-side surface, and a seventh lens with negative refractive power, optimizing the field of view, focal length, and curvature radii to reduce astigmatism and distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional camera lens design is used, then the device structure remains simple, but the imaging quality is low particularly in poor light conditions and macro shooting
Solution Approach 1:
The lens group is divided into seven individual lens elements with specific refractive power distributions. Each lens element has defined curvature radii and spacing distances that work together to correct optical aberrations. The segmentation allows independent optimization of each element's contribution to overall imaging quality, enabling high performance in poor light and macro conditions while maintaining manageable structural complexity through systematic design
Solution Approach 2:
Different regions of the lens group are assigned specific functional characteristics. The first lens has positive refractive power for initial light convergence, while subsequent lenses have varying powers including negative power in the seventh lens for aberration correction. Each lens surface (object-side and image-side) is optimized with specific curvature radii to address local optical quality requirements at different positions in the optical path
2Manufacturing precision
If the field of view and focal length are increased to improve imaging quality, then the lens parameters become more complex, but machining difficulty increases
Solution Approach 1:
The patent specifies precise parameter ranges for curvature radii (R1-R14), spacing distances (T12-T67, TD), and refractive powers that balance optical performance with manufacturability. By optimizing these parameters within defined ranges, the design achieves high imaging quality while keeping the curvature radii and spacing values within practical machining capabilities, avoiding excessively tight tolerances that would make manufacturing difficult
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 configuration significantly improves imaging quality by enhancing the field of view, reducing aberrations, and achieving high luminous flux, while allowing for compact and easy machining of the lens group.
Implementation Method 1
an optical imaging lens group, which sequentially includes from an object side to an image side along an optical axis of the optical imaging lens group: a first lens with a positive refractive power; a second lens with a refractive power
Data Source
AI summary
The disclosure provides an optical imaging lens group. The optical imaging lens group sequentially includes from an object side to an image side along an optical axis of the optical imaging lens group: a first lens with a positive refractive power; a second lens with a refractive power, an image-side surface of the second lens is a concave surface; a third lens with a refractive power; a fourth lens with a refractive power, an image-side surface of the fourth lens is a concave surface; a fifth lens with a refractive power; a sixth lens with a refractive power, an image-side surface of the sixth lens is a concave surface; and a seventh lens with a negative refractive power. A maximum field of view FOV of the optical imaging lens group and an effective focal length f of the optical imaging lens group satisfy tan(FOV/2)*f>5 mm.