Imaging Lens Aberration Correction via Segmented Groups
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing imaging lenses face challenges in correcting aberrations, particularly chromatic aberration and astigmatism, especially when designed for high pixel count imaging devices with low F-numbers, leading to inadequate optical performance for compact and wide-angle applications.
Innovation Solution
The design includes a negative first lens group and a positive second lens group with specific refractive power configurations, such as cemented lenses with biconvex and meniscus lenses, along with aperture stops, to satisfy conditional expressions that optimize aberration correction and lens geometry, enabling compact, fast, and wide-angle imaging lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the F-number of the imaging lens is decreased to achieve a fast lens, then the imaging speed and light gathering capability are improved, but the outer diameter of the most object side lens will be excessively increased
Solution Approach 1:
The imaging lens is divided into multiple lens groups (first lens group with negative refractive power, second lens group with positive refractive power, and third lens group with negative refractive power), where each group contributes differently to light gathering and focusing. This segmentation allows the system to achieve fast F-number without requiring any single lens element to have excessive diameter.
Solution Approach 2:
Different lens groups are assigned different refractive powers and optical characteristics tailored to their specific functions. The first and third lens groups with negative refractive power control light convergence, while the second lens group with positive refractive power provides focusing power, allowing each component to be optimized for its local role in achieving overall fast F-number performance.
2Measurement precision
If the number of pixels in the imaging device is increased to achieve high resolution, then the image quality is improved, but various aberrations such as chromatic aberration and astigmatism become more prominent and difficult to correct
Solution Approach 1:
The lens system is segmented into three distinct lens groups with alternating signs of refractive power, allowing different portions of the optical system to address different types of aberrations. This segmentation enables targeted correction of chromatic aberration, astigmatism, and other optical imperfections that become more significant with high pixel count imaging devices.
Solution Approach 2:
The patent employs specific conditional expressions that define optimal ranges for refractive powers, focal lengths, and spacing between lens groups. By carefully controlling these parameters within specified ranges, the system achieves effective aberration correction that maintains image quality across high pixel count imaging applications.
3Area of stationary object
If the imaging lens is designed with a wide angle of view and compact size, then the field of view and portability are improved, but aberration correction becomes more difficult
Solution Approach 1:
The wide-angle imaging lens is divided into three lens groups with alternating refractive powers, where each group is optimized for specific aberration correction tasks. This segmentation enables effective control of aberrations inherent in wide-angle designs while maintaining a compact overall form factor suitable for portable applications.
Solution Approach 2:
Each lens group is assigned specific optical characteristics tailored to its position and function in the optical system. The negative-positive-negative configuration allows local optimization of ray paths to correct wide-angle aberrations while keeping the overall lens assembly compact.
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 corrects various aberrations, ensuring favorable optical performance even with increased pixel counts and low F-numbers, making the lenses suitable for high-resolution imaging applications.
Implementation Method 1
a cemented lens that is formed by bonding a second lens, which is a biconvex lens, and a third lens, which is a negative meniscus lens
Implementation Method 2
In the case that the F-number of the imaging lens is intended to be decreased, the outer diameter of the most object side lens will be excessively increased
Data Source
AI summary
An imaging lens substantially consists of a negative first lens group and a positive second lens group in this order from the object side. The first lens group substantially consists of only a first lens, which is one biconcave lens. The second lens group substantially consists of, in the following order from the object side: a cemented lens, which is formed by bonding a second lens, i.e., a biconvex lens, and a third lens, i.e., a negative meniscus lens, in this order from the object side, and which has a positive refractive power as a whole; an aperture stop; and a cemented lens that is formed by bonding a fourth lens, i.e., a biconvex lens and a fifth lens, i.e., a negative meniscus lens in this order from the object side and that has a positive refractive power as a whole.