Optical Lens Aberration Correction via Segmented Groups
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Solution Overview
Problem
Designing a projection lens with low manufacturing costs and favorable imaging quality is challenging due to aberration issues, which are often addressed by increasing the number of lenses or using aspheric lenses, leading to higher costs and complexity.
Innovation Solution
An optical lens design featuring a first lens group with negative refractive power and a second lens group with positive refractive power, arranged to form an image, with a viewing angle greater than 116.7 degrees, effectively resolving aberration issues while reducing the number of lenses and simplifying manufacturing and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to correct aberration, then imaging quality is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The lens system is divided into two distinct groups: a first lens group with negative refractive power and a second lens group with positive refractive power. This segmentation allows each group to perform specific optical functions, with the first group handling aberration correction and the second group handling image formation, thereby reducing the total number of lenses needed while maintaining imaging quality
Solution Approach 2:
The patent employs aspheric lenses with specific aspheric coefficients (K values) to correct aberrations. By changing the surface curvature parameters from spherical to aspheric, the system achieves effective aberration correction with fewer lenses. The aspheric coefficients are carefully controlled within specific ranges to optimize both imaging quality and system simplicity
2Manufacturing precision
If aspheric lenses are used to correct aberration, then imaging quality is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies aspheric surfaces selectively only where needed for aberration correction, rather than making all lenses aspheric. The first lens group contains aspheric lenses with controlled aspheric coefficients, while the second lens group uses spherical lenses that are easier and cheaper to manufacture. This localized application of aspheric surfaces optimizes the balance between imaging quality and manufacturing cost
3Manufacturing precision
If the total length of lenses is increased to correct aberration, then imaging quality is improved, but volume of projection system increases
Solution Approach 1:
The patent combines aberration correction and image formation functions into a compact two-group structure. The first lens group with negative refractive power and the second lens group with positive refractive power are arranged in close proximity, merging multiple optical functions into a single compact system. This integration reduces the total length and volume of the projection system while maintaining effective aberration correction and image quality
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 favorable imaging quality with reduced costs and complexity by using fewer lenses, specifically by employing aspheric lenses in the first lens group and spherical lenses in the second group, effectively correcting aberrations and maintaining a wide viewing angle.
Implementation Method 1
The first lens group is disposed between a magnified side and a minified side and has a negative refractive power. The second lens group is disposed between the first lens group and the minified side and has a positive refractive power.
Data Source
AI summary
An optical lens includes a first lens group and a second lens group. The first lens group is disposed between a magnified side and a minified side and has a negative refractive power. The second lens group is disposed between the first lens group and the minified side and has a positive refractive power. The optical lens is capable of forming an image at the magnified side. F/H>0.52, where F is an effective focal length, and H is an image height. A viewing angle is greater than 116.7 degrees.