Prism-Folded Imaging Lens for Compact Long-Focal-Length Optics
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Solution Overview
Problem
Imaging lens systems with long focal lengths face challenges in achieving a small size and miniature form factor, making them difficult to mount in small terminals, and optical path folding members can introduce unintended light incidence, degrading resolution.
Innovation Solution
An imaging lens system with a lens group and optical path folding members, including prisms with light-shielding structures and reflective surfaces, is designed to maintain a long focal length while reducing size and minimizing unwanted light incidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a long focal length imaging lens system is designed, then imaging resolution is improved, but the system size and thickness increase
Solution Approach 1:
The patent introduces an optical path folding member (prism) that redirects light along a folded path rather than a straight linear path. This dimensional change in the optical path allows the lens system to achieve a long focal length for high resolution while maintaining a compact overall form factor by utilizing three-dimensional spatial arrangement instead of linear extension.
2Volume of moving object
If an optical path folding member is introduced to reduce system size, then the terminal size is reduced, but unintended light incidence occurs on the imaging plane
Solution Approach 1:
The patent extracts and removes the harmful function of the optical path folding member by introducing a light-shielding member that blocks unintended light paths. The light-shielding member selectively removes parasitic light rays that would otherwise reach the imaging plane through the folded path, while preserving the useful reflected light path.
Solution Approach 2:
The light-shielding member acts as an intermediary element between the optical path folding member and the imaging plane. It mediates the interaction by selectively blocking harmful light paths while allowing the intended optical path to pass through, thus preventing unintended light incidence without compromising the folding function.
3Measurement precision
If a light-shielding member is added to block unintended light, then resolution is improved, but device complexity increases
Solution Approach 1:
The patent merges the light-shielding function with the existing optical path folding member structure. The light-shielding member is integrated into or positioned in conjunction with the prism assembly, combining multiple functions (folding and light blocking) into a unified structural element rather than adding a completely separate complex subsystem.
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 a compact form factor with high resolution by using prisms to fold the optical path and shield unwanted light, enhancing imaging performance in small devices.
Implementation Method 1
The folded lens imaging lens system may use a prism to reduce an external size of an optical path
Implementation Method 2
a lens group including a first lens, a second lens, and a third lens sequentially disposed from an object side toward an imaging plane
Data Source
AI summary
An imaging lens system is provided. The imaging lens system includes a lens group including a plurality of lenses; and an optical path folding member disposed between the lens group and an imaging plane. The lens group may include three or more lenses sequentially arranged from an object side. The optical path folding member may include a first prism and a second prism. At least one of the first prism and the second prism may include a visor that prevents a flare.