Compact Imaging Lens Layout for Aberration-Corrected Focusing
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Solution Overview
Problem
There is a need for an imaging lens that balances small size with favorable optical performance, particularly in camera systems, which existing technologies have not adequately addressed.
Innovation Solution
The imaging lens is designed with a configuration comprising a first lens group that moves along the optical axis and a second lens group fixed with respect to the image plane, where the first lens closest to the object side is negative, and specific conditional expressions are satisfied to optimize optical performance and size, including the use of aspherical lenses and a specific lens arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lens system uses more lenses to improve optical performance, then aberration correction improves, but the overall size and complexity of the lens system increases
Solution Approach 1:
The patent applies parameter changes by utilizing aspherical surfaces with specific curvature radii and refractive indices to achieve superior aberration correction with fewer lens elements. The aspherical coefficients and material parameters are optimized to provide the required optical performance while maintaining a compact structure.
Solution Approach 2:
The lens system is segmented into two functional groups: a first lens group with positive refractive power and a second lens group with negative refractive power. This segmentation allows each group to be optimized for specific aberration corrections, achieving high optical performance with a minimal number of elements.
2Length of moving object
If the lens system is made compact to reduce size, then portability improves, but optical performance and aberration correction deteriorate
Solution Approach 1:
The patent employs aspherical surfaces in multiple lens elements to achieve superior aberration correction in a compact form. The aspherical curvature allows for more efficient light ray control compared to traditional spherical surfaces, enabling high optical performance in a reduced lens system length.
Solution Approach 2:
The lens system adopts a nested configuration where the second lens group with negative power is positioned within the optical path of the first lens group with positive power. This nesting allows the groups to work synergistically, with the negative power group correcting aberrations introduced by the positive power group, achieving compact dimensions without sacrificing optical performance.
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 solution achieves a compact imaging lens with improved optical performance by effectively correcting aberrations and maintaining image quality across various focal distances.
Implementation Method 1
a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power in this order from the object side to the image side
Data Source
AI summary
An imaging lens consists of, in order from an object side to an image side, a first lens group and a second lens group. During focusing, the first lens group moves along an optical axis, and the second lens group is fixed with respect to an image plane. A lens of the first lens group closest to the object side is a negative lens. The imaging lens satisfies a predetermined conditional expression.