Three-Group Imaging Optics for Wide-Angle Aberration Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing imaging optical systems struggle to effectively compensate for various types of aberrations, particularly in wide-angle lenses, which affects image quality and size constraints.
Innovation Solution
An imaging optical system comprising a first lens group with positive power, a second lens group with negative power, and a third lens group with positive power, where the first and third lens groups are fixed with respect to the image plane, and the second lens group moves along the optical axis during focusing, with specific lens arrangements and bonding using UV curable resin to enhance aberration compensation and downsizing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a wide-angle lens system uses conventional lens arrangements, then the angle of view is wide, but various types of aberrations occur and image quality deteriorates
Solution Approach 1:
The lens system is divided into three distinct lens groups (first group with positive power, second group with negative power, third group with positive power) arranged in sequence. This segmentation allows each group to be optimized for specific aberration compensation functions, enabling effective control of distortion and other optical aberrations while maintaining wide angle of view.
Solution Approach 2:
Different regions of the lens system are assigned different optical characteristics. The first lens group (positive power) handles incoming light and initial focusing, the second lens group (negative power) specifically compensates for distortion and aberrations, and the third lens group (positive power) finalizes the image formation. This local optimization of optical properties at different positions achieves superior image quality.
2Volume of moving object
If the lens diameter is reduced for compact design, then the device size decreases, but aberration compensation becomes insufficient
Solution Approach 1:
The second lens group is designed to move along the optical axis during focusing operations. This dynamic adjustment allows the lens system to maintain optimal aberration compensation across different focus distances while using a compact overall lens diameter. The movable second group can reposition itself to optimize its aberration correction capability at each focus state.
3Shape
If the first lens group is positioned closer to the object for wide-angle coverage, then the angle of view increases, but aberration compensation difficulty increases
Solution Approach 1:
The second lens group acts as an intermediary between the first lens group (which captures wide-angle light) and the third lens group (which forms the final image). This intermediate group specifically compensates for the aberrations introduced by the wide-angle first group, making the overall system more manageable. The intermediary second group translates the complex aberration correction task into a coordinated multi-group effort.
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, particularly distortion, while maintaining a wide angle of view and reducing lens diameter, contributing to a compact design with improved image quality.
Implementation Method 1
an imaging optical system which consists of: 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
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 first lens group and the third lens group are fixed with respect to an image plane, with the second lens group moving along an optical axis, while the imaging optical system is focusing to make a transition from an infinity in-focus state toward a close-object in-focus state. 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 lens L1A1 having negative power; a lens L1A2 having negative power; and a lens L1A3 having negative power.