Zoom Lens Image Stabilization for Wide-Angle Blur Reduction
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Solution Overview
Problem
Existing zoom lenses with large image stabilizing units face challenges in reducing image blur at the peripheral part due to differences in image-point moving amounts between the central and peripheral parts, leading to residual image blur, especially in super-wide-angle lenses with fields of view exceeding 100°.
Innovation Solution
A zoom lens design featuring a first lens unit with negative refractive power, a rear group including multiple lens units with negative refractive power for image stabilization, and a focus unit positioned near the aperture stop, where the image stabilizing unit moves orthogonally to the optical axis, optimizing the distance ratio between the aperture stop and the image stabilizing unit to reduce the size and weight while maintaining high optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large image stabilizing unit is used to reduce image blur, then image stabilization performance is improved, but device size increases
Solution Approach 1:
The patent applies local quality by positioning the image stabilizing unit with negative refractive power at a specific location within the rear group, optimized for wide-angle performance. The unit has a focal length satisfying -0.80<fLIS/-fL1≤-0.15, creating localized optical correction that efficiently reduces peripheral image blur without requiring a large stabilizing unit throughout the entire lens system.
Solution Approach 2:
The patent changes the refractive power parameter of the image stabilizing unit by setting it to negative refractive power with a specific focal length ratio. This parameter optimization allows the stabilizing unit to achieve maximum image blur reduction efficiency at wide-angle positions while maintaining a compact overall lens structure.
2Volume of moving object
If the image stabilizing unit is positioned closer to the aperture stop to reduce size, then device size is reduced, but image blur correction effectiveness decreases
Solution Approach 1:
The patent optimizes the positional parameter of the image stabilizing unit by defining the distance ratio 0.40≤DISw/DSPw≤0.80. This parameter optimization positions the stabilizing unit at an optimal distance from the aperture stop, achieving effective image blur correction while maintaining a compact lens structure.
3Adaptability or versatility
If a super-wide-angle design with field of view exceeding 100° is implemented, then field of view is improved, but peripheral image blur increases
Solution Approach 1:
The patent addresses peripheral image quality in super-wide-angle designs by placing a dedicated image stabilizing unit with negative refractive power in the rear group. This localized stabilization mechanism specifically targets peripheral image points that experience larger blur due to the wide field of view, while the central portion maintains its natural optical characteristics.
Solution Approach 2:
The patent uses a negative refractive power image stabilizing unit that creates a virtual image correction effect. By positioning this unit to move during image stabilization, it generates corrective optical paths that counteract the peripheral blur inherent in super-wide-angle projections.
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 effectively reduces image blur at the peripheral parts, allows for a compact and lightweight zoom lens, and enables efficient image stabilization, achieving a balance between optical performance and size reduction.
Implementation Method 1
The image stabilizing lens unit performs optical image stabilization (OIS) that reduces (corrects) image blur caused by shake (referred to as camera shake hereinafter) of an image pickup apparatus due to manual shake or the like by moving (shifting) in a direction orthogonal to an optical axis.
Implementation Method 2
a first lens unit having negative refractive power, and a rear group including two or more lens units... A distance between adjacent lens units changes during zooming
Data Source
AI summary
A zoom lens includes, in order from an object side to an image side, a first lens unit having negative refractive power, and a rear group including two or more lens units, and an aperture stop. The rear group includes an image stabilizing unit having negative refractive power and configured to move with a component in a direction orthogonal to an optical axis during image stabilization, and a focus unit disposed on the object side of the image stabilizing unit. A distance between adjacent lens units changes during zooming. A predetermined inequality is satisfied.