Zoom Lens High Magnification Compact Camera Shake Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional zoom lenses with camera shake correction functions have limited high variable magnification ratios, typically below 10×, and are not compact enough to meet modern demands for high performance and compactness.
Innovation Solution
A zoom lens configuration comprising five lens groups with specific refractive powers, where the distance between certain groups changes during zooming, and only the third-b lens group with negative refractive power moves perpendicular to the optical axis for camera shake correction, allowing for a high variable magnification ratio exceeding 12× while maintaining compactness and high performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional zoom lens configurations are used to achieve high variable magnification ratio, then the magnification ratio can reach over 12×, but the lens size becomes large and cannot be compact
Solution Approach 1:
The third lens group is divided into two sub-groups: a third-a lens group with positive refractive power and a third-b lens group with negative refractive power. This segmentation allows the third-b lens group to be moved independently for camera shake correction while maintaining the overall zoom functionality, enabling compact design with high variable magnification ratio exceeding 12×
Solution Approach 2:
The patent implements dynamic movement of the third-b lens group perpendicular to the optical axis for camera shake correction, while the distances between lens groups are consistently changed during zooming. This dynamic configuration allows the lens to maintain compact size while achieving high variable magnification ratio and effective vibration-proof functionality
2Reliability
If camera shake correction function is added to zoom lens, then vibration-proof performance is improved, but the device complexity increases
Solution Approach 1:
The third-b lens group with negative refractive power serves multiple functions: it contributes to the overall positive refractive power of the third lens group for zooming, and simultaneously provides camera shake correction when moved perpendicular to the optical axis. This multi-functionality reduces device complexity by using a single lens group for both zooming and vibration-proof operations
Solution Approach 2:
The camera shake correction function is merged into the third lens group structure by making the third-b lens group movable perpendicular to the optical axis. This integration combines the zooming functionality and vibration-proof functionality into a unified lens group configuration, simplifying the overall device structure while maintaining both functions
3Adaptability or versatility
If multiple lens groups are moved during zooming, then the zoom range is improved, but the focus mechanism burden increases
Solution Approach 1:
The focus mechanism burden is reduced by extracting the camera shake correction function from the focus mechanism. The third-b lens group is specifically designated for perpendicular movement to correct camera shake, separating this function from the axial movement required for focusing and zooming, thereby reducing the burden on the focus mechanism while maintaining extensive zoom range
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 enables a zoom lens with a high variable magnification ratio, compact size, and effective camera shake correction, reducing the burden on the focus mechanism and camera shake correction mechanism, while maintaining optical performance across the zoom range.
Implementation Method 1
a third-b lens group having negative refractive power, which are arranged in this order from the object side, and only the third-b lens group is moved in a direction perpendicular to the optical axis to achieve camera shake correction
Implementation Method 2
when varying magnification from a wide angle end to a telephoto end, the distance between the first lens group and the second lens group is consistently increased, the distance between the second lens group and the third lens group is consistently decreased, the distance between the third lens group and the fourth lens group is consistently decreased
Implementation Method 3
when moving a point of focus from an infinity side to a near side to achieve focus, only the fifth lens group is moved from the object side to the image side
Data Source
AI summary
A zoom lens substantially consists of, in order from the object side, a positive first lens group, a negative second lens group, a positive third lens group, a positive fourth lens group, and a negative fifth lens group. When varying magnification, the distances between adjacent lens groups) are changed, while all of the lens groups are moved with respect to an image formation position. When focusing, only the fifth lens group is shifted, and the third lens group has a third-a lens group having positive refractive power and a third-b lens group having negative refractive power, which are arranged in this order from the object side, only the third-b lens group is moved in a direction perpendicular to the optical axis to achieve camera shake correction.