Lens Barrel Light-Extinction Grooves for Stray Light Control
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Solution Overview
Problem
Portable electronic devices with lens modules suffer from poor imaging quality due to stray light interference during the imaging process, which affects their performance.
Innovation Solution
A lens module design featuring a lens barrel with an inner side wall containing an array of first light-extinction grooves that extend along the axial direction, reducing stray light interference by reflecting and attenuating light, while also increasing the bonding area for adhesives and ensuring efficient lens group installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inner side wall of the lens barrel is made smooth to facilitate lens group installation, then the installation efficiency is improved, but stray light interference occurs during imaging
Solution Approach 1:
The inner side wall is segmented into multiple light-extinction ridges and grooves instead of being smooth. The ridges divide the wall surface into distinct segments that work together to block stray light while maintaining structural integrity and facilitating lens installation through the organized pattern.
Solution Approach 2:
Different regions of the inner side wall have different properties: the light-extinction ridges provide light-blocking functionality in specific zones, while the overall structure maintains smooth surfaces where needed for lens installation. The ridges are strategically positioned to address stray light problems without compromising installation efficiency.
2Object-affected harmful factors
If the inner side wall is provided with light-extinction structures to reduce stray light, then the imaging quality is improved, but the bonding area for adhesive is reduced
Solution Approach 1:
The light-extinction structures extend primarily in the axial direction (length dimension) rather than reducing the radial bonding surface area. By orienting the ridges and grooves along the axial direction, the design achieves light extinction functionality without significantly compromising the circumferential bonding area available for adhesive application.
Solution Approach 2:
The light-extinction ridges are positioned in specific zones where they are most effective at blocking stray light, while leaving other areas of the inner side wall smooth and available for adhesive bonding. This localized approach ensures both optical performance and mechanical attachment requirements are met.
3Ease of operation
If light-extinction grooves extend in the axial direction to match lens group installation direction, then the installation process is facilitated, but the light reflection path may be extended
Solution Approach 1:
The axial orientation of the light-extinction grooves, which initially seems to extend the light reflection path and potentially increase energy loss, is actually beneficial. The extended axial path allows light to undergo multiple reflections and interactions with the ridge surfaces, progressively attenuating the stray light energy more effectively before it can reach the image sensor.
Solution Approach 2:
The axial grooves create multiple segmented reflection surfaces along the light path. Each ridge and groove interface acts as a separate reflection point, dividing the single long reflection path into multiple shorter segments that collectively achieve greater light attenuation through cumulative reflection effects.
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 improves imaging quality by minimizing stray light interference and enhancing the bonding area without hindering lens group installation, thus maintaining efficiency.
Implementation Method 1
when light propagates in the lens barrel from the object side to the image side, the light will be reflected many times and attenuated after entering the first light-extinction grooves arranged in an array
Data Source
AI summary
A lens module and an electronic device including the lens module are provided. The lens module includes a lens group and a lens barrel, and the lens group includes a plurality of lenses sequentially arranged from an object side to an image side; the lens barrel comprising an first wall enclosing a receiving cavity for receiving the lens group, and an inner side wall extending from an end of the first wall near the image side away from the lens group, a plurality of first light-extinction grooves arranged in an array are provided on the inner side wall, and each of the first light-extinction grooves extends along an axial direction of the lens barrel.