Imaging Lens Assembly Aberration Correction via Refractive Power Ratios
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Solution Overview
Problem
Existing imaging lens assemblies for compact devices face challenges in miniaturization and wide-angle capabilities due to unsuitable refractive power distribution and lens shapes, leading to difficulties in correcting aberrations and achieving optimal performance.
Innovation Solution
The proposed imaging lens assembly consists of four lenses with specific refractive powers and aspherical configurations, including an aperture stop, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, and a fourth lens with negative refractive power, arranged with a glass plate between the fourth lens and the image plane, satisfying specific conditions to optimize miniaturization and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional four-lens configurations are used, then the imaging lens assembly can be mounted in compact devices, but the refractive power distribution and lens shapes are unsuitable for miniaturization and wide-angle
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive power distribution among the four lenses and optimizing their shapes. Specifically, it sets the refractive power ratios of the first and second lenses within specific ranges and configures the third and fourth lenses with particular refractive power distributions. This parameter optimization enables both miniaturization and effective aberration correction simultaneously.
Solution Approach 2:
The patent applies local quality by assigning different refractive power characteristics to different lenses based on their specific functions. The first lens has a specific refractive power range for wide-angle coverage, the second lens has a negative refractive power within a calculated range for aberration correction, and the third and fourth lenses have optimized refractive power distributions. This localized optimization of optical properties achieves both compact size and high imaging quality.
2Quantity of substance
If the refractive power distribution of existing lenses is used, then the lens assembly can be manufactured, but it fails to achieve miniaturization and wide-angle capabilities
Solution Approach 1:
The patent changes the refractive power parameters of the lenses to achieve both miniaturization and wide-angle capability. It specifically sets the refractive power of the first lens within a calculated range based on the focal length, configures the second lens with a negative refractive power within a specific range, and optimizes the third and fourth lenses with particular refractive power distributions. These parameter changes enable the lens assembly to achieve 2ω ≥ 80° while maintaining compact size.
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 solution enables miniaturization, wide-angle capabilities, and effective aberration correction, resulting in improved imaging performance with characteristics such as TTL/IH1.5 and 2ω80°, while satisfying conditions for refractive power and curvature radius ratios to enhance image quality.
Implementation Method 1
a first lens L1 having a positive refractive power
Implementation Method 2
a second lens L2 having a negative refractive power
Implementation Method 3
a third lens L3 having a positive refractive power
Implementation Method 4
a fourth lens L4 having a negative refractive power
Data Source
AI summary
An imaging lens assembly includes, in order from an object side to an image side: an aperture stop; 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 focal length of the imaging lens assembly is f, a focal length of the first lens is f1; a focal length of the second lens is f2; a curvature radius of the object side surface of the first lens is R1; a curvature radius of the image side surface of the first lens is R2; a curvature radius of the object side surface of the second lens is R3; a curvature radius of the image side surface of the second lens is R4, and the lens assembly satisfies the following conditions: 1.08≦f1/f≦1.20; −4.00≦f2/f≦−2.50; −1.50≦(R1+R2)/(R1−R2)≦−1.25; 1.30≦(R3+R4)/(R3−R4)≦5.00.