Imaging Optical System Lens Groups for Compact Aberration Correction
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Solution Overview
Problem
Existing imaging optical systems struggle to effectively compensate for various types of aberrations, particularly when transitioning between infinity and close-object focus states, leading to challenges in achieving a compact size and optimal performance.
Innovation Solution
An imaging optical system configuration featuring specific lens arrangements and movements, including lenses with positive and negative powers, and adherence to specific ratios and inequalities to manage aberrations, allowing for high-performance and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lens arrangements are used, then the optical system can achieve basic imaging function, but the ability to compensate for various types of aberrations is insufficient
Solution Approach 1:
The optical system is divided into multiple lens groups (first lens group with positive power, second lens group with negative power, third lens group with positive power) arranged in sequence. Each lens group contains specific lenses with defined powers and configurations, allowing independent optimization of aberration compensation for each segment while maintaining overall system performance.
Solution Approach 2:
Specific lenses within each group are assigned particular powers and positions to address local aberration issues. For example, the negative power lens in the second group is positioned to correct specific aberrations introduced by surrounding positive power lenses, creating localized correction zones throughout the optical path.
2Reliability
If more lenses are added to improve aberration compensation, then aberration correction performance improves, but the optical system size increases
Solution Approach 1:
Multiple lens functions are combined into compact lens groups. The first, second, and third lens groups are arranged in a space-efficient configuration where each group serves multiple purposes: focusing light, correcting spherical aberration, minimizing chromatic aberration, and controlling field curvature simultaneously, rather than requiring separate dedicated elements for each function.
Solution Approach 2:
The optical system is designed with movable lens groups that can adjust their positions relative to each other and the image sensor. This dynamic configuration allows the system to maintain optimal aberration compensation across different focus distances (from infinity to close-up) and different aperture settings, maximizing performance within a compact form factor.
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 system effectively compensates for aberrations while maintaining a small size, ensuring high performance and efficient focus transitions between infinity and close-object states.
Implementation Method 1
a lens LF1 having positive power and located closer to an image plane than, and adjacent to, the aperture stop
Implementation Method 2
a lens LR1 having positive power and located closest to the image plane
Implementation Method 3
a lens LR2 having negative power and located closer to an object than, and adjacent to, the lens LR1
Implementation Method 4
a lens LR3 having positive power and located closer to an object than, and adjacent to, the lens LR2
Data Source
AI summary
An imaging optical system includes: an aperture stop; a lens LF1 having positive power and located closer to an image plane than, and adjacent to, the aperture stop; a lens LR1 having positive power and located closest to the image plane; a lens LR2 having negative power and located closer to an object than, and adjacent to, the lens LR1; and a lens LR3 having positive power and located closer to the object than, and adjacent to, the lens LR2, and satisfies the following inequalities (1) and (2):0.5<Linf/Yinf<2.65(1)0.5<BLinf/Yinf<2.0(2)where Linf is a total optical length in an infinity in-focus state,Yinf is an image height in the infinity in-focus state, andBlinf is a distance from an image-side surface of the lens located closest to the image plane to the image plane in the infinity in-focus state.