Switchable Zoom Lens Layout for Stable View and Longer Focal Length
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Solution Overview
Problem
Existing optical systems experience a reduction in the angle of view and fixed image size when changing focal length, causing user discomfort, especially during video recording, and lack versatility in supporting larger imaging elements.
Innovation Solution
A zoom lens design with a focusing part, variable magnification part, and imaging part that remains stationary during magnification changes, allowing switchable states with replaceable lens groups to adjust focal length while maintaining image formation position and suppressing aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the focal length is lengthened by replacing the extender lens with a master lens, then the image size can be increased, but the angle of view becomes smaller causing user discomfort
Solution Approach 1:
The patent implements a variable magnification part with at least two lens groups that can change spacing dynamically during magnification change. This dynamic adjustment allows the system to achieve both extended image size and maintained angle of view by optimizing the optical path in real-time, resolving the contradiction between these two parameters.
Solution Approach 2:
The patent changes the spacing parameter between lens groups in the variable magnification part to achieve desired magnification while maintaining angle of view. By precisely controlling this parameter, the system can lengthen focal length for larger image size without the angle of view reduction that would normally cause user discomfort.
2Adaptability or versatility
If the focal length is lengthened by replacing the extender lens, then the imaging element size can be supported, but aberrations increase degrading optical performance
Solution Approach 1:
The patent divides the lens system into distinct functional parts: focusing part, variable magnification part, and imaging part. This segmentation allows each part to be optimized independently for its specific function, enabling the system to support larger imaging elements while maintaining optical performance through specialized design of each segment.
Solution Approach 2:
The variable magnification part acts as an intermediary between the focusing part and imaging part, mediating the optical path to maintain proper focus and aberration control when imaging element size changes. This intermediary structure enables versatile imaging element support while preserving optical quality.
3Productivity
If the angle of view changes remarkably during imaging, then the focal length must be adjusted, but this causes user discomfort especially in video recording
Solution Approach 1:
The patent enables continuous and smooth magnification change through the variable magnification part's ability to adjust spacing continuously. This continuous action allows focal length adjustment without abrupt angle of view changes, maintaining user comfort during video recording while preserving full focal length adjustment range for productivity.
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 zoom lens effectively increases image size and maintains consistent angle of view by suppressing aberrations, enhancing optical performance and user comfort across different focal lengths.
Implementation Method 1
a focusing part that includes a focusing lens group moving during focusing
Implementation Method 2
a variable magnification part that includes at least two variable magnification lens groups of which spacings from adjacent groups change during magnification change
Implementation Method 3
in response to switching from the first state to the second state, a focal length of a whole system changes to a long focal length side
Data Source
AI summary
The zoom lens includes, in order from an object side, a focusing part, a variable magnification part, an aperture stop, and an imaging part. The zoom lens is switchable between a first state and a second state by replacing a part of the imaging part that is provided to be replaceable. In response to switching from the first state to the second state, a focal length of the zoom lens changes to a long focal length side while keeping an image formation position constant. The zoom lens satisfies predetermined conditional expressions.