Camera Lens Assembly with Large Aperture and Aberration Correction
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Solution Overview
Problem
Existing camera lens assemblies with an F-number of 2.0 or above fail to meet the higher imaging requirements, particularly in low-light conditions and when hand trembling occurs, due to insufficient aperture and sensitivity.
Innovation Solution
A camera lens assembly with a specific configuration of seven lenses, including a first lens with positive refractive power and a convex object-side surface, a second lens with positive refractive power and a convex object-side surface, a third lens with negative refractive power and a concave image-side surface, and a seventh lens with negative refractive power and a concave image-side surface, where the effective focal length and entrance pupil diameter satisfy f/EPD ≤ 1.60, and Abbe numbers and radii of curvature are optimized to achieve a large aperture and good imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the F-number is increased to 2.0 or above to reduce lens assembly size, then miniaturization is achieved, but imaging performance in low-light conditions deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the F-number to be below 2.0 (specifically 1.54 < F < 2.0) and optimizing the ratio between effective focal length and entrance pupil diameter (0.85 < f/EPD ≤ 1.60). This parameter optimization allows the lens to achieve a balance between compact size and sufficient aperture for low-light imaging performance.
2Volume of moving object
If the F-number is increased to 2.0 or above to reduce lens assembly size, then miniaturization is achieved, but sensitivity to hand trembling deteriorates
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: controlling the F-number below 2.0, setting the f/EPD ratio within 0.85-1.60, and optimizing the ratio of effective focal length to image sensor diagonal length (0.35 < f/Diag ≤ 0.70). These coordinated parameter changes improve imaging stability and reduce sensitivity to hand trembling while maintaining compact dimensions.
3Volume of moving object
If lens assembly size is reduced to meet miniaturization requirements, then portability is improved, but imaging quality deteriorates
Solution Approach 1:
The patent employs comprehensive parameter optimization including F-number control (1.54 < F < 2.0), f/EPD ratio (0.85 < f/EPD ≤ 1.60), and focal length to diagonal length ratio (0.35 < f/Diag ≤ 0.70). Additionally, specific curvature radius ratios are optimized (e.g., 0.10 < |(R4-R7)/(R4+R7)| < 1.50) to correct aberrations, achieving high imaging quality in a compact form factor.
Solution Approach 2:
The patent utilizes a seven-element lens design with strategically selected positive and negative power lenses. The system includes lenses with specific Abbe number constraints (e.g., 20 < Vd2 < 60 for the second positive lens) to balance chromatic aberration correction with compact design, effectively combining multiple optical elements to achieve superior imaging performance.
4Manufacturing precision
If a seven-lens configuration is used to improve imaging quality, then optical performance is enhanced, but device complexity increases
Solution Approach 1:
The patent manages complexity through systematic parameter control: the seven-lens configuration follows a specific power distribution (positive, positive, negative, positive, negative, positive, negative) with optimized focal length ratios (e.g., 0.30 < f1/f ≤ 1.00 for the first lens). This structured approach to parameter optimization achieves high imaging quality while maintaining design efficiency.
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 lens assembly achieves a large aperture, good imaging quality, and low sensitivity, effectively correcting chromatic aberration and reducing aberrations such as astigmatism and distortion, while maintaining miniaturization and improving imaging performance in various lighting conditions.
Implementation Method 1
a first lens having a positive refractive power, and an object-side surface of the first lens being a convex surface
Implementation Method 2
a second lens having a positive refractive power
Implementation Method 3
a third lens having a refractive power; a fourth lens; a fifth lens having a refractive power, an object-side surface of the fifth lens being a concave surface, and an image-side surface of the fifth lens being a convex surface
Implementation Method 4
a seventh lens having a negative refractive power, and an image-side surface of the seventh lens being a concave surface
Data Source
AI summary
A camera lens assembly is provided. The camera lens assembly includes, from an object side to an image side: a first lens having a positive refractive power, an object-side surface of the first lens being a convex surface; a second lens having a positive refractive power; a third lens having a refractive power; a fourth lens; a fifth lens having a refractive power, an object-side surface of the fifth lens being a concave surface, and an image-side surface of the fifth lens being a convex surface; a sixth lens having a refractive power, an image-side surface of the sixth lens being a concave surface; a seventh lens having a negative refractive power, an image-side surface of the seventh lens being a concave surface. An effective focal length f of the camera lens assembly and an entrance pupil diameter EPD of the camera lens assembly satisfy: f/EPD≤1.60.