90-Degree Optical Path Zoom Lens with Transverse Image Stabilization
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Solution Overview
Problem
There is a challenge in developing small, wide-angle zoom lenses with high zoom ratios for video and digital cameras that maintain image quality while minimizing size and weight, as existing solutions often compromise on image stability due to camera shake during hand-held shooting.
Innovation Solution
A zoom lens configuration comprising specific refractive power arrangements and movements of lens units, including a reflecting member that bends the optical path by 90 degrees, with conditional expressions governing the image magnification and focal lengths to achieve image stabilization and size reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the size of the zoom lens is reduced to minimize camera weight, then camera shake occurs during hand-held shooting, but increasing the size to stabilize the camera compromises the goal of weight reduction
Solution Approach 1:
The patent replaces the mechanical stabilization approach (making the camera body larger and heavier to resist shake) with an optical stabilization mechanism. By shifting lens units optically to counteract image displacement, the system achieves image stabilization without increasing camera weight, thus resolving the contradiction between lightweight design and image stability.
2Volume of moving object
If a prism is added to bend the optical path for size reduction, then the optical system size decreases, but image stabilization becomes more difficult due to altered optical geometry
Solution Approach 1:
The patent employs dynamic adjustment of lens unit positions to compensate for the static geometric changes introduced by the prism. By making the lens units movable and adjusting their positions based on shooting conditions, the system maintains effective image stabilization capability despite the altered optical path geometry caused by the prism.
Solution Approach 2:
The patent changes the operational parameters of the lens units (position, shift amount) to adapt to the presence of the prism in the optical system. By adjusting these parameters, the system achieves both compact size through the prism and effective image stabilization through modified lens unit movements.
3Reliability
If lens units are shifted perpendicular to the optical axis for image stabilization, then image quality is maintained during camera shake, but the complexity of the lens mechanism increases
Solution Approach 1:
The patent divides the lens system into multiple independent lens units, each capable of being shifted perpendicular to the optical axis. This segmentation allows for distributed stabilization functionality, where different lens units can be shifted by different amounts, providing effective image stabilization while keeping individual unit movements relatively simple.
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 compact, high-zoom-ratio zoom lens with improved image stabilization and optical performance, maintaining image quality across the zoom range while minimizing lens size and weight.
Implementation Method 1
the first lens unit comprises a reflecting member that bends the optical path by 90 degrees
Implementation Method 2
the entirety of or at least a part of the fifth lens unit is shifted in directions transverse to the optical axis to stabilize a picked-up image when the optical system vibrates
Data Source
AI summary
During zooming from the wide angle end to the telephoto end, a first lens unit having a positive refractive power is fixed, a second lens unit having a negative refractive power moves toward the image side, a third lens unit having a positive refractive power moves toward the object side, a fourth lens having a negative refractive power unit moves, and a fifth lens unit having a positive refractive power is fixed. The first lens unit includes a reflecting member that bends the optical path by 90 degrees. The entirety of or at least a part of the fifth lens unit is shifted in directions transverse to the optical axis to stabilize a picked-up image when the optical system vibrates. The zoom lens satisfies the predetermined expressions.