Three-Group Zoom Imaging Optics for Full-Range Aberration Compensation
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Solution Overview
Problem
Existing imaging optical systems struggle to compensate for various types of aberrations effectively over the entire zoom range, particularly in zoom lenses with specific lens group arrangements.
Innovation Solution
An imaging optical system comprising a first lens group with negative power, a second lens group with positive power, and a third lens group with negative power, arranged in a specific order, where the lens groups move along the optical axis during zooming to compensate for aberrations, with specific refractive index and curvature conditions met to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional zoom lens structure is used, then the device can achieve zoom functionality, but it cannot sufficiently compensate for various types of aberrations over the entire zoom range
Solution Approach 1:
The patent applies the dynamics principle by making the third lens group movable along the optical axis during zooming. The movement amount of the third lens group is specifically controlled to change with the zoom state, enabling dynamic aberration compensation across the entire zoom range. This resolves the contradiction by allowing the system to adapt its aberration compensation capability according to the current zoom position.
Solution Approach 2:
The patent employs parameter changes by adjusting the refractive index condition of the negative lens (L1nd ≥ 1.80) and controlling the movement amount of the third lens group as variables. By optimizing these parameters, the system achieves sufficient aberration compensation throughout the zoom range while maintaining compact dimensions and wide angle of view capabilities.
2Adaptability or versatility
If the lens groups are arranged to achieve wide angle of view, then the angle of view is widened, but the overall size of the system increases
Solution Approach 1:
The patent applies local quality by assigning specific optical properties to different lens groups. The first lens group uses a negative lens with high refractive index (L1nd ≥ 1.80) to provide strong diverging power for wide angle of view, while the third lens group is designed with specific movement characteristics to compensate for aberrations locally. This localized optimization allows wide angle of view without proportionally increasing overall system size.
Solution Approach 2:
The patent uses composite optical design by combining lens groups with different optical characteristics - a negative power first group, positive power second group, and negative power third group with specific refractive index materials. This composite structure achieves wide angle of view while controlling overall dimensions through the synergistic effect of different material properties.
3Volume of moving object
If the lens groups are arranged to reduce overall size, then the system becomes more compact, but aberration compensation capability deteriorates
Solution Approach 1:
The patent resolves this contradiction by making the third lens group movable with its movement amount dynamically adjusted during zooming. This dynamic configuration allows compact overall size while maintaining aberration compensation capability, as the third lens group moves to optimal positions for compensating aberrations at different zoom states without requiring a large fixed structure.
Solution Approach 2:
The patent uses parameter changes by optimizing the refractive index of the negative lens (L1nd ≥ 1.80) and the movement amount of the third lens group. These parameter optimizations enable effective aberration compensation in a compact configuration, resolving the trade-off between system size and aberration compensation capability.
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 achieves sufficient compensation for aberrations across the entire zoom range, allowing for a wide angle of view and reduced overall size, while maintaining optical performance.
Implementation Method 1
a first lens group G1 having negative power; a second lens group G2 having positive power; and a third lens group G3 having negative power. The first, second, and third lens groups G1, G2, and G3 move along an optical axis of the imaging optical system 101 such that an interval between adjacent ones of the first, second, and third lens groups G1, G2, and G3 changes while the imaging optical system 101 is zooming
Data Source
AI summary
An imaging optical system consists of: a first lens group having negative power; a second lens group having positive power; and a third lens group having power. The first, second, and third lens groups are arranged in this order such that the first lens group is located closest to an object and that the third lens group is located closest to an image plane. The first, second, and third lens groups move along an optical axis of the imaging optical system such that an interval between adjacent ones of the first, second, and third lens groups changes while the imaging optical system is zooming from a wide-angle end toward a telephoto end. The imaging optical system satisfies the following inequality: 1.85<L1nd, where L1nd is a refractive index of a negative lens located closest to the object.