Optical System Distortion Adjustment via Dual-Locus Lens Movement
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Solution Overview
Problem
Existing image pickup optical systems struggle to optically change distortion while maintaining high image quality, as existing methods either result in significant image deterioration or limited distortion adjustment, making it difficult to achieve both low and high distortion states effectively.
Innovation Solution
An optical system comprising an aperture stop and two lens units (A and B) that move along different loci during distortion adjustment, with specific conditions on focal lengths, moving amounts, and optical axis distances to change distortion optically while maintaining image quality, including conditional expressions to ensure good image quality in both normal and distortion change states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single lens unit is moved to change distortion, then the device complexity is reduced, but the extent of distortion change is limited and image quality deteriorates
Solution Approach 1:
The patent divides the lens system into multiple independently movable lens units (first lens unit and second lens unit) that can be moved along different loci. This segmentation allows each unit to contribute differently to distortion adjustment, enabling a wider range of distortion changes while maintaining manageable device complexity through modular design.
Solution Approach 2:
The patent introduces multi-dimensional movement by allowing lens units to move along different loci (not just simple linear translation). The first lens unit moves along a first locus while the second lens unit moves along a second locus, creating complex movement patterns that achieve greater distortion adjustment range without proportionally increasing device complexity.
2Adaptability or versatility
If lens units are moved to achieve sufficient distortion change, then the distortion adjustment range is improved, but image quality deteriorates
Solution Approach 1:
The patent applies local quality by giving different lens units different movement characteristics and optical properties. The first lens unit and second lens unit have different focal lengths and move along different loci, allowing each unit to be optimized for specific distortion correction tasks while maintaining overall image quality across the adjustment range.
Solution Approach 2:
The patent systematically changes multiple parameters simultaneously (focal lengths of lens units, movement amounts along different loci, distances on optical axis) to achieve distortion adjustment. By coordinating changes in these parameters according to specific conditional expressions, the system maintains image quality while achieving sufficient distortion change range.
3Adaptability or versatility
If multiple lens units are moved along different loci to change distortion, then the distortion adjustment range is improved, but the device complexity increases
Solution Approach 1:
The patent achieves multi-functionality by designing lens units that serve dual purposes: they contribute to both distortion adjustment and image quality maintenance. The same lens units that move along different loci for distortion correction also participate in focusing and other optical functions, reducing the need for separate dedicated components and thereby managing device complexity.
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 optical system effectively changes distortion while maintaining good image quality, allowing for both small and large distortion states without compromising image quality, enabling flexible framing and focus control.
Implementation Method 1
focal lengths of the unit A and the unit B, moving amounts of the unit A and the unit B during a change from the first optical state to the second optical state, distances on an optical axis from the aperture stop to the unit A and the unit B
Data Source
AI summary
An optical system includes an aperture stop, a unit A configured to move during a distortion adjustment, and a unit B disposed at an image side relative to the unit A and configured to move with a locus different from a locus of the unit A during the distortion adjustment, the optical system changes from a first optical state having a first distortion to a second optical state having a second distortion larger than the first distortion, and focal lengths of the units A and B, moving amounts of the units A and B during a change from the first to second optical states, distances from the aperture stop to the units A and B, distances from a lens surface of the unit A closest to the object side to an image plane, and a total optical length of the optical system satisfy a predetermined condition.