Camera Lens Assembly Aberration Control via Parameter Optimization
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Solution Overview
Problem
The challenge lies in achieving miniaturization of imaging lenses while maintaining high imaging quality, as existing technologies find it difficult to balance these two requirements simultaneously.
Innovation Solution
A camera lens assembly is designed with a specific configuration of lenses, including a first lens with positive refractive power, a second lens with negative refractive power, and a seventh lens with negative refractive power, where the on-axis distance, center thicknesses, and air spaces between lenses are carefully optimized to reduce astigmatism and distortion, ensuring a large image surface and ultra-thinness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lens assembly is miniaturized to meet portability requirements, then the thickness and size are reduced, but the imaging quality deteriorates due to increased astigmatism and distortion
Solution Approach 1:
The lens assembly is divided into seven individual lens elements with specific refractive powers arranged in sequence. Each lens element (first lens with positive power, second lens with negative power, third lens, fourth lens, fifth lens with convex object-side surface, sixth lens, and seventh lens with negative power) is optimized independently and collectively to control astigmatism and distortion while maintaining a compact TTL of 6.2mm or less.
Solution Approach 2:
The patent applies specific parameter ranges and ratios to control optical aberrations: the ratio of center thickness of fourth lens to fifth lens (0.6≤CT4/CT5≤1.5), air space ratios ((T23+T45)/T34≥1.9), and focal length relationships (|f/f3+f/f4|≤3.0, -0.15≤f/f5≤0.65). These parameter optimizations enable miniaturization while maintaining imaging quality by balancing astigmatism and distortion correction within the compact structure.
2Manufacturing precision
If multiple lenses are added to improve imaging quality, then the complexity and size increase, but the portability requirement is compromised
Solution Approach 1:
Rather than simply adding more lens elements, the patent optimizes the parameters of seven carefully selected lens elements with specific refractive powers and surface configurations. The use of aspheric surfaces on key elements (first, second, fifth, and seventh lenses) and precise control of thickness ratios and air space relationships enables effective aberration correction with a manageable number of elements, achieving high imaging quality without excessive complexity.
Solution Approach 2:
The patent employs aspheric surfaces on the first, second, fifth, and seventh lenses to correct optical aberrations more effectively than spherical surfaces alone. The aspheric configurations, combined with the convex object-side surface of the fifth lens, enable precise control of light paths to reduce astigmatism and distortion while maintaining a compact seven-element structure suitable for portable devices.
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
This configuration effectively reduces astigmatism and distortion, resulting in improved imaging quality and a compact lens design suitable for portable electronic devices.
Implementation Method 1
a first lens E1 with a positive refractive power; a second lens E2 with a negative refractive power; a third lens E3; a fourth lens E4; a fifth lens E5, an object-side surface S9 of which is a convex surface; a sixth lens E6; and a seventh lens E7 with a negative refractive power
Data Source
AI summary
The disclosure provides a camera lens assembly, which sequentially including from an object side to an image side along an optical axis: a first lens with a positive refractive power; a second lens with a negative refractive power; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens with a negative refractive power; wherein an on-axis distance TTL from an object-side surface of the first lens to an imaging surface of the camera lens assembly, a half of a diagonal length ImgH of an effective pixel region on the imaging surface and an effective focal length f of the camera lens assembly satisfy: 6 mm<TTL*(ImgH/f)<7 mm; a center thickness CT4 of the fourth lens, a center thickness CT5 of the fifth lens and an air space T56 from the fifth lens to the sixth lens on the optical axis satisfy: 0.5<(CT4+CT5)/T56≤1.3.