Imaging Optical System Aberration Compensation Compact Design
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Solution Overview
Problem
Existing imaging optical systems struggle to effectively compensate for various types of aberrations, particularly in achieving a balance between minimizing back focus and maintaining a compact lens design.
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. The lens groups are arranged such that the first lens group is closest to the object, and the second lens group moves along the optical axis during focusing, while the first and third lens groups remain immobile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the back focus is minimized to make the optical system more compact, then the overall size is reduced, but the ability to compensate for aberrations deteriorates
Solution Approach 1:
The optical system is divided into three distinct lens groups (G1, G2, G3) with specific power configurations. The first lens group G1 has positive power and includes multiple lenses arranged to control aberrations, the second lens group G2 has negative power and is movable for focusing, and the third lens group G3 has positive power. This segmentation allows each group to be optimized for specific functions while maintaining a compact overall structure with minimized back focus.
Solution Approach 2:
Each lens group is designed with specific local optical properties: G1 uses a combination of positive and negative lenses with specific focal lengths to correct aberrations locally, G2 is designed with negative power for effective focusing movement, and G3 provides final image formation. The aperture stop is positioned within G1 to locally control light paths and reduce aberrations. This local optimization enables sufficient aberration compensation despite the compact back focus distance.
2Adaptability or versatility
If the angle of view is widened to capture more scene, then the field of view is expanded, but the optical system complexity increases
Solution Approach 1:
The second lens group G2 is designed to be movable along the optical axis for focusing operations, transitioning from an infinity in-focus state to a close-object in-focus state. This dynamic element allows the system to maintain a compact structure while achieving varied focusing capabilities and widened angle of view without requiring multiple fixed lens groups for different focal lengths.
Solution Approach 2:
The first lens group G1 serves multiple functions: it provides positive power for overall focusing, contains the aperture stop for light control, and includes specific lens arrangements (with the fourth lens having negative power and specific focal length ratios) to correct both aberrations and enable widened angle of view. This multi-functionality reduces the need for additional dedicated components, thereby limiting complexity increase.
3Ease of operation
If the second lens group is made movable for focusing, then the focusing capability is improved, but the device complexity increases
Solution Approach 1:
The focusing function is extracted and assigned specifically to the second lens group G2, which has negative power and is positioned between G1 and G3. By isolating the focusing function to a single movable group rather than requiring movement of multiple groups or the entire optical system, the mechanical complexity is minimized while maintaining effective focusing capability from infinity to close-object distances.
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 allows for sufficient compensation of various aberrations, including distortion, while also widening the angle of view and maintaining a compact optical system design.
Implementation Method 1
The sub-lens group G1A includes, as a plurality of lenses: a meniscus lens L1A1 having positive power and having a convex surface facing the object; a meniscus lens L1A2 having negative power and having a convex surface facing the object; and a meniscus lens L1A3 having negative power and having a convex surface facing the object
Data Source
AI summary
An imaging optical system consists of a first lens group having positive power, a second lens group having power; and a third lens group having power. The first lens group and the third lens group are immobile along an optical axis and the second lens group moves along the optical axis while the imaging optical system is focusing. The first lens group consists of: a sub-lens group G1A; an aperture stop; and a sub-lens group G1B. The sub-lens group G1A includes: a meniscus lens L1A1 having positive power and having a convex surface facing the object; a meniscus lens L1A2 having negative power and having a convex surface facing the object; and a meniscus lens L1A3 having negative power and having a convex surface facing the object.