Folded Imaging Lens Assembly With Stray Light Trap Structure
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Solution Overview
Problem
The challenge in modern imaging lens assemblies for portable electronic devices is the need to reduce stray light while maintaining high quality imaging performance.
Innovation Solution
The imaging lens assembly incorporates a light blocking element with protruding structures arranged in a two-dimensional array, forming a light trap structure, and a reflective element with a reflecting surface to fold the optical axis, along with specific angles and configurations to effectively block stray light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light blocking element with protruding structures is added to reduce stray light, then imaging quality is improved, but device complexity increases
Solution Approach 1:
The light blocking element incorporates protruding structures arranged in arrays that create a porous-like structure. These structures effectively trap and block stray light while maintaining a compact form factor, improving imaging quality without proportionally increasing overall device complexity
Solution Approach 2:
The protruding structures are integrated within the light blocking element in a nested configuration, where multiple functional elements (light blocking surfaces, protruding structures, reflective surfaces) are combined in a compact arrangement, reducing the need for separate components
2Volume of moving object
If the optical path is folded using a reflective element, then the device size is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The reflective element is integrated with the light blocking element in a combined structure, where the reflective surface and light blocking surfaces work together as a unified optical component. This merging reduces the number of separate optical elements that need to be aligned, thereby reducing manufacturing precision requirements while achieving optical path folding
Solution Approach 2:
The reflective element acts as an intermediary that folds the optical path between the lens and image sensor, enabling compact device size. The reflective surface is positioned and angled to redirect light at specific angles, creating a folded optical path that reduces the physical distance between components
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
This design significantly reduces stray light entry, enhances imaging quality, and allows for adjustable focal length and optical stability, improving the overall performance of the lens assembly.
Implementation Method 1
The reflective element is disposed on an object side or an image side of the lens element, and includes a first reflecting surface. The first reflecting surface is configured to fold the optical axis.
Implementation Method 2
The light blocking element is opaque, the light blocking element is disposed corresponding to the lens element or the reflective element
Data Source
AI summary
An imaging lens assembly has an optical axis, and includes a lens element, a reflective element and a light blocking element, wherein the optical axis passes through the lens element. The reflective element is disposed on an object side or an image side of the lens element, and includes a first reflecting surface. The light blocking element is disposed corresponding to the lens element or the reflective element, and includes a first light blocking surface and a plurality of protruding structures. The first light blocking surface is disposed between the lens element and the reflective element, and the protruding structures are disposed on the first light blocking surface and arranged in a two-dimensional array. On a section coinciding with the optical axis, a first angle is formed between the first light blocking surface and the optical axis.