Variable Magnification Lens Orthogonal Shake Compensation
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Solution Overview
Problem
Conventional variable magnification optical systems fail to effectively compensate for camera shake, which affects optical performance.
Innovation Solution
A variable magnification optical system comprising specific lens units with fixed and movable components, where at least part of the Gn lens unit moves orthogonally to the optical axis, and the focal length of the Gn-1 lens unit is within a specific ratio to the entire system's focal length, allowing for effective camera shake compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional variable magnification optical systems are used, then variable magnification function is achieved, but camera shake compensation capability is insufficient
Solution Approach 1:
The optical system is divided into multiple lens units (first through fifth lens units) with different functions. The Gn lens unit (fifth lens unit) is specifically designated for camera shake compensation by moving orthogonally to the optical axis, while other lens units handle focusing and magnification changes. This segmentation allows each unit to be optimized for its specific function, resolving the contradiction between shake compensation and variable magnification performance.
Solution Approach 2:
The system employs dynamic movement of the Gn lens unit orthogonally to the optical axis to compensate for camera shake during operation. This dynamic adjustment capability is integrated into the variable magnification system, allowing the lens to adapt its position in real-time to counteract shake while maintaining variable magnification functionality across different focal lengths.
2Reliability
If traditional camera shake compensating mechanisms are added, then camera shake compensation is improved, but device size and weight increase
Solution Approach 1:
The Gn lens unit serves multiple functions: it contributes to the variable magnification capability of the optical system while simultaneously providing camera shake compensation through orthogonal movement. This multi-functionality eliminates the need for separate dedicated shake compensation mechanisms, thereby avoiding additional weight and size increases while maintaining effective shake compensation capability.
Solution Approach 2:
The camera shake compensation function is merged with the existing variable magnification optical system by utilizing the Gn lens unit for both purposes. Instead of adding a separate compensation mechanism, the system combines shake compensation with the lens units already present in the variable magnification configuration, reducing overall system weight and complexity.
3Reliability
If the Gn-1 lens unit focal length is not optimized, then design flexibility is maintained, but optical performance deteriorates
Solution Approach 1:
The patent specifies that the absolute value of the focal length of the Gn-1 lens unit (|fGn-1|) should satisfy a particular relationship with the focal length of the entire system (fw). By optimizing this focal length parameter, the system achieves improved optical performance and effective camera shake compensation while maintaining a manageable lens unit configuration. This parameter optimization balances performance requirements with design 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 system achieves optical performance capable of dealing with camera shake, enabling downsizing and weight reduction of camera shake compensating mechanisms while maintaining excellent imaging performance across various focal lengths.
Implementation Method 1
at least a part of the Gn lens unit moves so as to have a component in a substantially orthogonal direction to the optical axis
Implementation Method 2
a first lens unit with a positive refractive power arranged nearest to an object; a second lens unit arranged on the image plane side of the first lens unit; a Gn lens unit arranged nearest to the image plane
Data Source
AI summary
A variable magnification optical system ZL to be mounted on an electronic still camera 1 or the like is configured to have, in order from the object side, a first lens unit G1 having a positive refractive power, a second lens unit G2 having a negative refractive power, a third lens unit G3 having a positive refractive power, a fourth lens unit G4 having a negative refractive power, and a fifth lens unit G5 having a positive refractive power, and configured in such a manner that, in variable magnification, the first lens unit G1 is fixed, that, in focusing, the third lens unit G3 moves, and that at least a part of the fifth lens unit G5 moves so as to have a component in a substantially orthogonal direction to the optical axis.