Zoom Lens System Aspherical Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional zoom lens systems require a large number of lenses to achieve high aberration correction and telecentricity, leading to increased fabrication costs and reduced imaging quality, necessitating a more efficient design with fewer lenses.
Innovation Solution
A zoom lens system comprising a first lens group of negative refractive power and a second lens group of positive refractive power, including at least one aspherical lens, which allows for a reduced number of lenses while maintaining high imaging quality by optimizing the exit pupil position and back focal length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a large number of lenses are used to achieve high aberration correction and telecentricity, then imaging quality is improved, but fabrication costs increase
Solution Approach 1:
The patent changes the optical parameters by introducing aspherical surfaces on selected lenses (1st, 2nd, or 5th lens) instead of using multiple spherical lenses. The aspherical surfaces are defined by specific mathematical equations with coefficients that allow precise control of light paths, achieving superior aberration correction with fewer lens elements. This parameter change from spherical to aspherical geometry resolves the contradiction by maintaining high imaging quality while reducing the total lens count to 5 elements.
2Manufacturing precision
If a large number of lenses are used to ensure telecentricity, then imaging quality is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by providing aspherical surfaces only on specific lenses (1st, 2nd, or 5th lens) rather than all lenses. Each aspherical lens is strategically positioned to correct specific aberrations and maintain telecentricity in critical regions of the optical path. This localized application of complex aspherical geometry on select elements achieves high telecentricity performance while keeping the overall device complexity low with only 5 total lens elements.
3Ease of manufacture
If the number of lenses is reduced to lower fabrication costs, then manufacturing efficiency is improved, but aberration correction capability deteriorates
Solution Approach 1:
The patent employs aspherical curvature on selected lenses to replace multiple spherical lenses. The aspherical surfaces follow specific mathematical profiles (e.g., x = cy² + αy⁴ + βy⁶ + γy⁸) that provide superior aberration correction capabilities compared to spherical surfaces. This curvature modification allows the 5-lens system to achieve the same or better aberration correction performance that would traditionally require 7-10 spherical lenses, thus resolving the contradiction between manufacturing cost and optical performance.
4Device complexity
If a reduced number of lenses is used, then device complexity is reduced, but imaging quality may be compromised
Solution Approach 1:
The patent uses composite optical design by combining spherical and aspherical lens surfaces in a 5-element system. The aspherical lenses (1st, 2nd, or 5th lens) are integrated with spherical lenses to create a hybrid optical system that leverages the advantages of both surface types. This composite approach maintains high imaging quality with corrected aberrations and telecentricity while keeping device complexity low, as the aspherical surfaces are precisely defined by mathematical equations that can be manufactured with modern techniques.
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 design achieves improved imaging quality with a reduced number of lenses, enhancing aberration correction and reducing light spot size on the image plane, thus lowering fabrication costs and improving performance across different optical modes.
Implementation Method 1
a first lens group of negative refractive power and a second lens group of positive refractive power... at least one of the first lens, the second lens, the third lens, the fourth lens and the fifth lens is an aspherical lens having at least one aspherical surface
Data Source
AI summary
A zoom lens system includes a first lens group of negative refractive power and a second lens group of positive refractive power. The first lens group includes a first lens of negative refractive power, and the second lens group is disposed between the first lens group and a reduced side and includes in order from a magnified side to the reduced side a second lens of positive refractive power, a third lens of positive refractive power, a fourth lens of negative refractive power, and a fifth lens of positive refractive power. At least one of the first lens to the fifth lens is an aspherical lens having at least one aspherical surface.