Imaging Optical System Aberration Compensation via Lens Group Segmentation
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Solution Overview
Problem
Current imaging optical systems face challenges in effectively compensating for various types of aberrations, particularly when transitioning from an infinity in-focus state to a close-object in-focus state, due to limitations in lens group arrangements and movement mechanisms.
Innovation Solution
The proposed imaging optical system consists of a first lens group with positive power, a second lens group with negative power, and a third lens group with positive power, where the second lens group moves along the optical axis during focusing, while the first and third lens groups remain fixed, optimizing the arrangement of lenses to reduce aberrations through specific power distributions and refractive indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the second lens group moves toward the image plane during focusing transition, then focus sensitivity is improved, but aberration compensation becomes insufficient
Solution Approach 1:
The imaging optical system divides the lens system into three separate lens groups (first, second, and third) with different power configurations. The second lens group containing negative power lenses is responsible for focusing movement, while the first and third lens groups with positive power compensate for aberrations. This segmentation allows independent optimization of focus sensitivity and aberration compensation without requiring the entire lens system to move.
2Volume of moving object
If the second lens group is positioned closer to the image plane than the aperture stop, then compactness is improved, but aberration control becomes difficult
Solution Approach 1:
The patent assigns specific optical properties to different lens groups based on their local functions. The second lens group positioned near the image plane uses negative power lenses optimized for focusing movement in a compact space, while the first and third lens groups positioned elsewhere use positive power lenses specifically designed to compensate for the aberrations introduced by the negative power group. Each lens group's properties are locally optimized for its specific role in the overall system.
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 significantly reduces the angle of incidence and height of radial bundles of rays, minimizing the production of high-order aberrations and enhancing the system's ability to compensate for chromatic aberration, coma, and field curvature, thereby improving focus sensitivity and overall image quality.
Implementation Method 1
a first lens group G1 having positive power; a second lens group G2 having negative power; and a third lens group G3 having positive power... The first lens group includes a negative lens having a convex surface facing the object... The second lens group consists of: a positive lens Lp having a convex surface facing the object; and a negative lens Ln
Data Source
AI summary
An imaging optical system consists of: a first lens group having positive power; a second lens group having negative power; and a third lens group having positive power. The second lens group moves along an optical axis of the optical system toward an image plane, while the optical system is focusing to switch from an infinity in-focus state to a close-object in-focus state. The first lens group includes a negative lens having a convex surface facing the object and located closest to the object. The second lens group is located closer to the image plane than an aperture stop and consists of: a positive lens having a convex surface facing the object; and a negative lens. The third lens group consists of three or more lenses including one or more negative lenses. One of the three or more lenses which is located closest to the object is a positive lens.