Seven-Piece Camera Lens Aberration Correction
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Solution Overview
Problem
There is a need for a wide-angle imaging lens with excellent optical characteristics, small size, and fully corrected aberrations, particularly for handheld terminal devices such as smartphones and digital cameras.
Innovation Solution
A seven-piece camera optical lens design is proposed, comprising lenses with specific refractive powers and surface curvatures, which satisfy certain conditions to achieve large aperture, ultra-thin, and wide-angle capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a multi-piece lens structure is used to improve imaging quality, then image quality is improved, but device complexity increases
Solution Approach 1:
The optical lens system is divided into seven separate lens elements with specific refractive powers (positive and negative) arranged in sequence from object side to image side. This segmentation allows each lens element to contribute to correcting specific aberrations while collectively achieving high imaging quality. The division into multiple elements with alternating positive and negative refractive powers enables precise control over light paths and aberration correction.
2Volume of moving object
If the pixel area of the photosensitive device shrinks to reduce device size, then device size is reduced, but imaging quality deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges for the seven lens elements including focal length ratios (0.15≤f5/f4≤0.50, 1.00≤d4/d6≤8.00), curvature radius ratios (−15.00≤(R9+R10)/(R13+R14)≤−6.00), and thickness ratios. These parameter optimizations ensure that even with reduced device size and smaller photosensitive device pixels, the optical system maintains excellent imaging quality by precisely controlling aberrations and light paths through mathematically optimized lens parameters.
3Length of stationary object
If an ultra-thin design is implemented to reduce device thickness, then device thickness is reduced, but optical performance deteriorates
Solution Approach 1:
The patent achieves ultra-thin design (TTL/IH≤1.55) by optimizing the three-dimensional arrangement and spacing of the seven lens elements. The specific distance ratios (1.00≤d4/d6≤8.00) and thickness ratios (0.07≤d1/TTL≤0.22, 0.02≤d3/TTL≤0.06, 0.03≤d5/TTL≤0.11, 0.05≤d7/TTL≤0.15, 0.03≤d9/TTL≤0.12, 0.08≤d11/TTL≤0.19, 0.05≤d13/TTL≤0.08) enable precise control of optical paths within a compressed axial space, maintaining excellent optical characteristics including large aperture (FNO≤1.69) and wide field of view (FOV≥77.50°) despite reduced overall thickness.
4Area of moving object
If a wide-angle design is used to increase field of view, then field of view is increased, but aberration correction becomes more difficult
Solution Approach 1:
The optical lens system employs a composite structure of seven lens elements with alternating positive and negative refractive powers, creating a composite optical system that effectively corrects aberrations across the wide field of view. The combination of different refractive power elements (positive and negative) works synergistically to correct various types of aberrations (spherical, chromatic, coma, astigmatism, field curvature, and distortion) while maintaining the wide-angle capability (FOV≥77.50°). This composite lens structure allows each element to compensate for the aberrations introduced by others, achieving excellent aberration correction across the entire 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 camera optical lens achieves excellent optical characteristics, including large aperture, wide angle, and ultra-thin design, making it suitable for mobile camera lens components and web camera lenses with high pixel CCD or CMOS.
Implementation Method 1
a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, a fifth lens having a negative refractive power, a sixth lens having a positive refractive power and a seventh lens having a negative refractive power
Data Source
AI summary
The present invention discloses a camera optical lens consisting of seven-piece lenses including a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, a fifth lens having a negative refractive power, a sixth lens having a positive refractive power and a seventh lens having a negative refractive power. The camera optical lens satisfies the following conditions: 0.15≤f5/f4≤0.50, −15.00≤(R9+R10)/(R13+R14)≤−6.00, and 1.00≤d4/d6≤8.00. The camera optical lens according to the present invention has excellent optical characteristics, such as large aperture, wide angle, and ultra-thin.