Six-element Camera Lens Design for Ultra-thin Wide-angle Imaging
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Solution Overview
Problem
Current camera lenses for handheld devices and imaging systems face challenges in achieving ultra-thinness, wide angle, and large aperture while maintaining good optical performance, particularly with the increasing demand for smaller pixel sizes and improved imaging quality.
Innovation Solution
A six-piece camera optical lens design is proposed, comprising specific refractive power configurations and curvature radii for each lens, along with optimized focal lengths and thicknesses, to balance spherical aberration, field curvature, and reduce total optical length, ensuring ultra-thinness and wide-angle capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a six-piece lens structure is adopted to improve imaging quality, then optical performance is improved, but the lens structure becomes complex and cannot achieve ultra-thinness
Solution Approach 1:
The patent applies parameter changes by optimizing the focal lengths, curvature radii, and thicknesses of the six lens elements to specific ranges. This allows the complex six-piece structure to achieve ultra-thinness (TTL/ImgH ≤ 1.20) while maintaining good optical performance, resolving the contradiction between complexity and thinness.
Solution Approach 2:
The patent segments the optical system into six distinct lens elements with specific positive and negative refractive powers arranged in a particular sequence. This segmentation allows each element to contribute differently to the overall optical performance, enabling the system to achieve wide angle (FOV ≥ 81°), large aperture (FNO ≤ 1.90), and ultra-thinness simultaneously.
2Ease of manufacture
If the lens structure is simplified to reduce complexity, then manufacturing is easier, but imaging quality deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element (focal lengths, curvature radii, thicknesses) that balance manufacturing feasibility with optical performance. These parameter constraints enable standard manufacturing processes to produce a six-piece lens with excellent imaging quality, resolving the contradiction between ease of manufacture and imaging quality.
3Length of moving object
If the total optical length is reduced to achieve ultra-thinness, then device thickness is improved, but optical performance may deteriorate
Solution Approach 1:
The patent inverts the traditional approach by starting with the constraint of ultra-thinness (TTL/ImgH ≤ 1.20) and working backwards to design the optical system. Instead of optimizing for performance first and then reducing thickness, the patent designs the six lens elements with specific parameters that simultaneously achieve both ultra-thinness and good optical performance, including wide angle and large aperture capabilities.
Solution Approach 2:
The patent employs parameter changes by optimizing the focal lengths, curvature radii, and spacing of the six lens elements to specific ranges that enable ultra-thinness while maintaining optical performance. The conditional expressions define precise parameter relationships that resolve the contradiction between reduced length and performance.
4Reliability
If the aperture is increased to improve light gathering, then imaging quality is improved, but chromatic aberration increases
Solution Approach 1:
The patent segments the optical system into six lens elements with alternating positive and negative refractive powers. This segmentation allows different elements to correct different types of aberrations, including chromatic aberration. The specific arrangement and parameter ranges of these elements work together to minimize chromatic aberration while maintaining large aperture (FNO ≤ 1.90) and good imaging quality.
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 design achieves an ultra-thin, wide-angle, and large-aperture camera lens with improved imaging quality and reduced chromatic aberrations, suitable for high-pixel CCD and CMOS imaging elements.
Implementation Method 1
a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a negative refractive power; a fourth lens having a negative refractive power; a fifth lens having a positive refractive power; and a sixth lens having a negative refractive power
Data Source
AI summary
Disclosed is a camera optical lens, comprising, from an object side to an image side in sequence: a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a negative refractive power; a fourth lens having a negative refractive pwer; a fifth lens having a positive refractive power; and a sixth lens having a negative refractive power; wherein, the camera optical lens satisfies: −2.50≤f2/f≤−1.20; 3.50≤(R5+R6)/(R5−R6)≤12.00; 4.00≤R10/R9; and 0.50≤d5/d6≤1.20; where, f denotes a focus length of the camera optical lens; f2 denotes a focus length of the second lens; R5 and R6 denote central curvature radii of an object side surface and an image side of the third lens; R9 and R10 denotes central curvature radii of an object side surface and an image side of the fifth lens.