Four-Lens Image Sensor with Aspheric Surfaces for Aberration Correction
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Solution Overview
Problem
Conventional image sensing lenses with four lenses face challenges in correcting aberrations such as distortion, curvature of field, chromatic aberration, coma aberration, and spherical aberration while maintaining a compact size and high resolving power, particularly due to limitations in focal length distribution and material dispersion.
Innovation Solution
An image sensing lens configuration comprising an aperture stop, a first positive refracting lens, a second negative refracting lens with a concave image-side surface, a third positive meniscus lens with a convex image-side surface, and a fourth negative refracting lens with a central concave and peripheral convex image-side surface, optimized by specific focal length and Abbe number relationships to correct aberrations and reduce height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional four-lens configuration is used, then the lens structure is compact and production cost is controlled, but aberrations such as distortion, curvature of field, and chromatic aberration cannot be corrected sufficiently
Solution Approach 1:
The patent applies parameter changes by optimizing the focal length ratios (0.30≤f2/f1≤0.60, 0.60≤f3/f1≤1.20, −0.50≤f4/f1≤0.10) and Abbe number difference (5≤v1−v2≤30) to achieve superior aberration correction. The specific parameter ranges for focal lengths and material properties enable the four-lens system to correct multiple aberrations simultaneously without increasing structural complexity
Solution Approach 2:
The patent employs composite materials by selecting lens materials with specific Abbe numbers where the difference between the first and second lenses satisfies 5≤v1−v2≤30. This material selection strategy creates a composite optical system that corrects chromatic aberration and other aberrations effectively, combining different material properties to achieve superior optical performance
2Length of stationary object
If the focal length of the first lens is increased to reduce overall lens height, then chromatic aberration and coma aberration worsen
Solution Approach 1:
The patent uses parameter changes by establishing the focal length ratio constraint 0.30≤f2/f1≤0.60, which optimizes the distribution of refracting power among the lenses. This parameter optimization allows the lens system to maintain a compact height while effectively correcting chromatic aberration and coma aberration through balanced power distribution
3Manufacturing precision
If glass material is used instead of plastic to improve optical characteristics, then production cost increases and productivity decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the Abbe number difference between lens materials (5≤v1−v2≤30), which enables effective chromatic aberration correction using plastic materials. This parameter optimization allows the use of cost-effective plastic lenses instead of expensive glass materials while maintaining superior optical performance and high production 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 configuration effectively corrects aberrations, achieves a high resolving power, and reduces the overall length of the lens, enabling the production of compact camera modules with improved optical characteristics.
Implementation Method 1
a first lens having a positive refracting power
Implementation Method 2
a second lens having a negative refracting power
Implementation Method 3
a third lens having a positive refracting power
Implementation Method 4
a fourth lens having a negative refracting power
Data Source
AI summary
To provide an image sensing lens and an image sensing module each of which includes four lenses and each of which corrects aberrations well and has a great resolving power and a reduced height, an image sensing lens includes (i) a third lens which has a surface facing an image surface, the surface being an aspheric surface and (ii) a fourth lens which has a surface facing an object and a surface facing the image surface, the surfaces being each an aspheric surface. The image sensing lens satisfies the following Formulae (1) through (3):0.51<f1/f<0.78 (1)−1.63<f2/f<−0.97 (2)v1−v2>20 (3).