Zoom Lens Intermediate Image Segmentation for High Magnification
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Solution Overview
Problem
Existing zoom lenses struggle to maintain satisfactory optical performance while achieving high magnification, particularly in projection type display devices and imaging apparatuses.
Innovation Solution
A zoom lens design comprising a first and second optical system, where the second optical system forms an intermediate image and includes a positive lens with a convex surface facing the enlargement side, and movable lens groups that move during magnification, while stationary lens groups are fixed to the reduction-side imaging plane, ensuring telecentricity and reducing lens diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a zoom lens is designed to achieve high magnification, then the magnification capability is improved, but the optical performance deteriorates
Solution Approach 1:
The zoom lens is divided into two distinct optical systems: a first optical system for forming an intermediate image and a second optical system for re-forming the intermediate image on the final imaging plane. This segmentation allows each system to be optimized independently, enabling high magnification while maintaining optical performance.
Solution Approach 2:
An intermediate image is introduced as a mediator between the object and the final image plane. The first optical system forms this intermediate image, and the second optical system re-forms it. This intermediary step enables the decoupling of magnification functions, allowing high magnification to be achieved without compromising the optical quality of either imaging stage.
2Adaptability or versatility
If more lens groups are added to achieve high magnification, then the magnification capability is improved, but the device complexity increases
Solution Approach 1:
The lens system is segmented into two functional optical systems with clear division of labor. The first system handles intermediate image formation with fewer moving components, while the second system handles final image formation. This segmentation reduces overall complexity compared to a single-system design achieving the same magnification.
Solution Approach 2:
The patent employs a hybrid static-dynamic lens group configuration where certain lens groups remain stationary while others move during zoom operation. This dynamic arrangement allows magnification changes without requiring all lens groups to move, thereby reducing mechanical complexity while maintaining high magnification capability.
3Volume of moving object
If the lens system is made compact, then the volume is reduced, but the optical performance deteriorates
Solution Approach 1:
The patent utilizes a folded optical path configuration where the optical system is arranged in a compact, multi-dimensional layout rather than a simple linear extension. This allows the optical systems to be positioned closer together spatially while maintaining the necessary optical path lengths for high magnification and performance.
Solution Approach 2:
The two optical systems are nested or closely integrated in a compact arrangement, with the first optical system positioned to form an intermediate image that is immediately re-formed by the second optical system. This nested configuration minimizes the overall volume while preserving the optical performance required for high magnification.
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 design maintains high optical performance and magnification with a compact lens system, suppressing aberrations and simplifying the magnification changing mechanism, suitable for projection type display devices and imaging apparatuses.
Implementation Method 1
a lens closest to the enlargement side in the second optical system is a positive lens that has a convex surface facing the enlargement side, in which the second optical system forms an intermediate image at a position conjugate to a reduction-side imaging plane
Implementation Method 2
the first optical system re-forms the intermediate image on an enlargement-side imaging plane
Data Source
AI summary
A zoom lens consists of a first optical system and a second optical system in order from an enlargement side to a reduction side. The second optical system forms an intermediate image at a position conjugate to a reduction-side imaging plane, and the first optical system re-forms the intermediate image on an enlargement-side imaging plane. A lens closest to the enlargement side in the second optical system is a positive lens that has a convex surface facing the enlargement side. The second optical system includes, continuously in order from a position closest to the enlargement side to the reduction side, a first movable lens group, a second movable lens group, and a third movable lens group each of which moves during changing magnification. In the entire zoom lens, lens groups that move during changing magnification are only the first to third movable lens groups.