Zoom Lens Image Stabilizing Unit Peripheral Blur Correction
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Solution Overview
Problem
Conventional zoom lenses fail to effectively correct image blur at the peripheral portion of the image, especially at wider angles, despite correcting it at the central portion, due to larger changes in perspective and image stabilization limitations.
Innovation Solution
A zoom lens configuration with a front group including a focus unit and an aperture stop, combined with an image stabilizing unit having negative refractive power, where the distances between lens units change during zooming, and specific optical parameters are satisfied to minimize image blur in the peripheral region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an image stabilizing unit is added to correct image blur at the central portion, then central image quality is improved, but peripheral image blur remains uncorrected
Solution Approach 1:
The patent applies local quality by positioning the image stabilizing unit at a specific location in the optical system (between the aperture stop and the rear group) and designing it with specific optical parameters (negative refractive power, specific focal length relationships) to target peripheral image blur correction specifically, while allowing the central portion to be handled by conventional stabilization methods. This localized approach with specific optical characteristics enables differential correction across the image field.
2Area of stationary object
If the zoom lens is designed with wider angle to increase field of view, then angle of view is improved, but peripheral image blur increases
Solution Approach 1:
The patent applies parameter changes by establishing specific mathematical relationships between optical parameters: the focal length of the image stabilizing unit (fIS) must satisfy 0.3×fw < fIS < 0.7×fw where fw is the focal length at wide-angle end, and the distance from the aperture stop to the image stabilizing unit (DIS) must satisfy 0.4×DSPw < DIS < 0.6×DSPw where DSPw is the distance to the image plane. These parameter constraints enable effective peripheral blur correction across the wider field of view.
3Reliability
If the distance between aperture stop and image stabilizing unit is increased to improve stabilization, then image stabilization performance is improved, but lens length increases
Solution Approach 1:
The patent resolves this contradiction by establishing the parameter relationship 0.4×DSPw < DIS < 0.6×DSPw, which optimizes the distance between the aperture stop and the image stabilizing unit. This specific range achieves effective image stabilization while preventing excessive increase in overall lens length, balancing performance with compactness.
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 solution results in a compact zoom lens with excellent optical characteristics that effectively suppresses image blur across the entire image area, even during image stabilization, maintaining high-quality imaging performance.
Implementation Method 1
an image stabilizing unit having negative refractive power
Data Source
AI summary
A zoom lens includes, in order from an object side to an image side, a front group including a plurality of lens units, an image stabilizing unit having negative refractive power, and a rear group including one or more lens units. Each distance between adjacent lens units changes during zooming. The front group has a focus unit and an aperture stop. Predetermined inequalities are satisfied.