Front Group Lens Aberration Control for High Pixel Imaging
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Solution Overview
Problem
Conventional photographing lenses with large diameters face challenges in correcting various aberrations, particularly with the increasing number of pixels in imaging devices, as existing methods are inadequate in achieving superior correction of spherical aberration and curvature of field.
Innovation Solution
The optical system consists of a front group with positive refractive power and a rear group, where the front group is moved along the optical axis during focusing, and specific conditional expressions are satisfied to optimize the focal lengths and lens configurations, ensuring effective correction of spherical aberration and curvature of field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a lens is added to a double Gaussian lens system to correct aberrations in large diameter photographing lenses, then aberration correction is improved, but the device complexity increases
Solution Approach 1:
The optical system is divided into two main groups: a front group with positive refractive power and a rear group. This segmentation allows each group to be optimized for specific functions, with the front group primarily responsible for aberration correction and the rear group for focusing, thereby reducing overall system complexity while maintaining correction effectiveness
Solution Approach 2:
The front group is specifically designed with particular refractive power characteristics (0.45 < fF/f < 0.65) to address aberration correction locally at the front of the system, while the rear group handles the remaining optical functions. This localized optimization allows effective aberration correction without requiring complex modifications throughout the entire lens system
2Ease of operation
If the front group is moved along the optical axis for focusing, then focusing capability is improved, but spherical aberration and curvature of field worsen
Solution Approach 1:
The patent establishes specific parameter ranges for the front group's refractive power (0.45 < fF/f < 0.65) and shape factors that remain constant during focusing operations. By carefully controlling these parameters, the system enables front group movement for focusing while maintaining acceptable levels of spherical aberration and curvature of field correction
Solution Approach 2:
The front group is designed to be movable along the optical axis for focusing operations, while the rear group remains stationary. This dynamic configuration allows focusing capability while the fixed rear group maintains consistent aberration correction characteristics across different focus distances
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 results in an optical system with excellent aberration correction capabilities, suitable for imaging devices with high pixel counts, by maintaining optimal refractive power and shape factors within the lens groups.
Implementation Method 1
a front group having positive refractive power
Data Source
AI summary
An optical system comprises, in order from an object side, a front group having positive refractive power and a rear group. Upon carrying out focusing, the front group is moved along the optical axis. A predetermined conditional expression is satisfied. Thus, an optical system having a superb optical performance being able to correct superbly various aberrations and being suitable to be used with an imaging device having highly increased number of pixels, an optical equipment equipped therewith and a manufacturing method for the optical system are provided.