Seven-Lens Imaging System for Wide Field of View and Aberration Control
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Solution Overview
Problem
Conventional imaging lenses struggle to provide high optical performance with a wide field of view and proper aberration correction for large image sensors, especially in compact devices like smart TVs and mobile terminals, due to limitations in correcting aberrations and maintaining compactness.
Innovation Solution
The proposed imaging lens configuration consists of seven constituent lenses arranged in specific refractive power groups, including a biconvex first lens, negative second lens, positive third lens, negative fourth lens, meniscus fifth lens, meniscus double-sided aspheric sixth lens, and negative seventh lens, with carefully optimized Abbe numbers and aspheric surfaces to correct chromatic and spherical aberrations, ensuring a compact design with a wide field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional imaging lens is used with a large image sensor to achieve high resolution, then the optical system size increases, but various aberrations become more serious and optical performance deteriorates
Solution Approach 1:
The imaging lens is divided into seven distinct lens elements with specific refractive powers arranged in groups. This segmentation allows each element to be optimized for specific aberration correction while maintaining overall compactness. The positive and negative refractive power lenses are alternately arranged to control both the optical path and aberrations effectively.
Solution Approach 2:
Each lens element is designed with specific local properties: the first lens has a convex object-side surface for light convergence, the second lens has negative refractive power for aberration correction, the sixth lens has a concave image-side surface for field curvature control, and the seventh lens has negative refractive power for chromatic aberration correction. These localized optimizations enable high performance across the entire optical system.
2Area of stationary object
If the lens is designed to provide a wide field of view, then the field coverage increases, but correction of aberrations becomes very difficult particularly in the peripheral area
Solution Approach 1:
The lens design incorporates aspheric surfaces on multiple elements, allowing the curvature to vary dynamically across the lens aperture. This enables effective aberration correction across the wide field of view, particularly in the peripheral areas where conventional spherical lenses fail. The aspheric profiles are optimized to maintain image quality from center to edge.
3Manufacturing precision
If more lens elements are added to correct aberrations, then optical performance improves, but device compactness is compromised
Solution Approach 1:
Multiple lens elements are merged into a compact arrangement where positive and negative refractive power lenses are closely spaced. The sixth and seventh lenses are positioned near the image plane to correct residual aberrations without significantly increasing total length. This merging strategy achieves superior aberration correction while maintaining compact form factor 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 achieves high optical performance with a wide field of view and effective aberration correction, maintaining compactness and enhancing the imaging capabilities in both small and large image sensors, particularly in high-functional products like smart TVs and mobile devices.
Implementation Method 1
a first lens with positive refractive power having a convex shape on the object-side surface near an optical axis
Implementation Method 2
a second lens with negative refractive power
Implementation Method 3
a sixth lens having a concave surface on the image side near an optical axis, and a seventh lens with negative refractive power
Data Source
AI summary
An imaging lens which uses a larger number of constituent lenses for higher performance and features a low F-value, low-profile design and a wide field of view. Designed for a solid-state image sensor, the imaging lens includes constituent lenses arranged in order from an object side to an image side: a first positive refractive power lens; a second negative refractive power lens; a third lens; a fourth lens; a fifth lens; a sixth lens having a concave image-side surface near an optical axis; and a seventh negative refractive power lens.