Lens Module with Triangular Extinction Structures for Stray Light Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Optical lens modules face significant challenges with stray light interference due to light reflections inside the module, which degrade imaging quality despite efforts to reduce light reflection at the entrance.
Innovation Solution
The lens module incorporates a roughened inner side surface with triangular extinction structures surrounding the pressing ring and lens closest to the image side, which disperses reflected light and increases frictional force for stable mounting, thereby reducing stray light interference and enhancing imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If measures are taken to reduce light reflection at the light entrance, then light reflection at the entrance is reduced, but stray light formed by multiple reflections inside the lens module still degrades imaging quality
Solution Approach 1:
The patent applies local quality by treating different surfaces within the lens module differently. Specifically, the light entrance surface receives anti-reflection treatment, while the inner side surface of the lens barrel is designed with roughened texture and extinction structures. This localized differentiation addresses both the entrance reflection problem and the internal stray light problem with appropriate surface treatments in different locations.
Solution Approach 2:
The patent converts the harmful effect of light reflection into a beneficial outcome by using the reflected light to create a roughened surface texture through controlled deposition. The reflected light serves as the energy source that builds up the extinction structures, which then prevent harmful stray light. This transforms the harmful reflection into a constructive process for creating the anti-stray-light surface.
2Reliability
If the inner side surface is made rough to reduce stray light, then stray light interference is reduced, but the mounting stability of lens components may be compromised
Solution Approach 1:
The patent segments the inner side surface into functionally distinct zones: one area with roughened texture and extinction structures for stray light reduction, and another area with smooth surface for stable component mounting. This segmentation allows each zone to optimize its specific function without compromising the other, as the smooth mounting area provides reliable mechanical attachment while the roughened area handles optical stray light control.
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 solution effectively minimizes stray light interference and improves imaging quality by diffusing reflected light and providing a stable clamping force for the lens components, while also increasing gas permeability.
Implementation Method 1
The inner side surface 111 is provided with a plurality of extinction structures 111a surrounding the pressing ring 13 and the lens 12 closest to the image side... When the light is incident on the roughened inner side surface 111, the light is not easy to be reflected by the roughened surface to form stray light
Implementation Method 2
The roughened inner side surface 111 has a greater frictional force. The extinction structures 111a on the inner side surface 111 surrounding the pressing ring 13 and the lens 12 closest to the image side can increase the clamping force for the pressing ring 13 and the lens 12 by the greater frictional force
Data Source
AI summary
The present disclosure provides a lens module. The lens module includes a lens barrel provided with a light through hole and defining a receiving space; a lens group having a plurality of lenses and disposed in the receiving space; and a pressing ring disposed on an image side of the lens group. The plurality of lenses has a common optical axis. The lens barrel includes an inner side surface facing the optical axis. The inner side surface is provided with a plurality of extinction structures surrounding both the pressing ring and a lens of the plurality of lenses closest to the image side. The plurality of extinction structures is arranged in sequence in a direction from the object side towards the image side. Each of the plurality of extinction structures extends from the inner side surface towards the optical axis and has a triangular cross section.