Folded-Path Imaging Lens Design for Compact High-Resolution Terminals
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Solution Overview
Problem
Imaging lens systems with long focal lengths face challenges in achieving a small thickness and miniature size, making them difficult to mount in small terminals, and optical path folding members can introduce unintended light that degrades resolution.
Innovation Solution
An imaging lens system with a lens group and optical path folding member, where the folding member is partially covered by a light-shielding member, and includes structures like grooves and inclined surfaces to manage light, using prisms to reduce size and maintain resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a telephoto imaging lens system with long focal length is used, then high resolution is achieved, but the system thickness and size increase making it difficult to mount in small terminals
Solution Approach 1:
The patent introduces an optical path folding member (prism) that redirects light at right angles, transforming the linear optical path into a folded configuration. This allows the optical axis to bend within the system, effectively reducing the thickness direction while maintaining the required focal length and imaging resolution through three-dimensional spatial rearrangement of optical components
2Length of moving object
If an optical path folding member is introduced to reduce system size, then compact design is achieved, but unintended light enters the imaging plane degrading resolution
Solution Approach 1:
The patent extracts and removes unintended light rays from the optical path by positioning light-shielding members at specific locations. These shielding members block stray light that would otherwise enter the imaging plane through the optical path folding member, thereby preserving imaging resolution while maintaining the compact folded design
Solution Approach 2:
The patent introduces light-shielding members as intermediary elements between the optical path folding member and the imaging plane. These intermediaries selectively block harmful unintended light while allowing useful light to pass through, resolving the contradiction between compact design and image quality
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 design while maintaining high resolution by effectively managing light paths and reducing flare, suitable for small terminals like smartphones and augmented reality devices.
Implementation Method 1
an optical path folding member disposed between the lens group and the imaging plane
Implementation Method 2
A portion of the optical path folding member, other than an incident light entrance area and an emitted light exit area of the optical path folding member, may be covered by a light-shielding member
Implementation Method 3
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.