Optical Imaging Lens Assembly Stray Light Management
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Solution Overview
Problem
The increasing number of lenses in optical imaging lens assemblies for smartphones leads to higher imaging specifications and stricter assessments for stray light ghost images, particularly for main camera lenses, which face challenges in design due to the higher probability of stray light issues.
Innovation Solution
The optical imaging lens assembly includes a specific arrangement of lenses and spacing pieces, where the sixth spacing piece has a maximal thickness greater than the center thickness of the sixth lens, and the inner diameters and spacing distances of the spacing pieces are optimized to satisfy certain ratios, effectively improving stray light management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of lenses in the optical imaging lens assembly is increased to meet diverse camera functions, then the imaging specifications are improved, but the probability of stray light ghost images increases and design difficulty increases greatly
Solution Approach 1:
The patent introduces spacing pieces as intermediary elements between adjacent lenses. These spacing pieces serve multiple functions: they maintain precise spacing distances to control optical paths, provide structural support to reduce stray light reflections, and facilitate assembly. By placing these intermediary components at critical positions where segment differences exist, the patent effectively manages stray light issues while maintaining the multi-lens configuration needed for high imaging specifications.
2Reliability
If the number of lenses is increased to satisfy various photography scenarios, then the photographing quality is improved, but the risk of stray light reflected by the inner-diameter surface of spacing pieces increases
Solution Approach 1:
The patent converts the potentially harmful effect of spacing piece inner-diameter surfaces into a beneficial anti-stray light structure. By designing the spacing pieces with specific inner diameter dimensions and positioning them at critical locations, the patent creates intentional light-blocking structures that prevent stray light from reaching the image sensor. The spacing pieces' inner surfaces, which could potentially reflect stray light, are instead configured to block and absorb stray light paths, transforming a potential harm into a protective feature.
3Object-affected harmful factors
If spacing pieces are added between lenses to manage stray light, then stray light reflection is reduced, but the device complexity and assembly difficulty increase
Solution Approach 1:
The patent merges multiple functions into the spacing pieces: structural support, spacing maintenance, and anti-stray light control. By combining these functions into single integrated components rather than separate elements, the patent reduces the overall number of parts and simplifies assembly. The spacing pieces are designed to be positioned at specific locations where they simultaneously provide mechanical support, maintain optical spacing, and block stray light paths, thereby reducing assembly complexity despite the presence of multiple lenses.
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 configuration enhances the strength of the sixth lens, prevents deformation during assembly, and improves the imaging quality by effectively managing stray light, while maintaining the structural stability and supporting the lenses properly.
Implementation Method 1
the risk of stray light reflected by the inner-diameter surface of a spacing piece increases
Implementation Method 2
The optical lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens that are sequentially arranged along an optical axis
Data Source
AI summary
An optical imaging lens assembly includes a lens barrel, first to seventh lenses sequentially arranged along an optical axis from an object side to an image side, a fifth spacing piece and a sixth spacing piece. The fifth spacing piece is placed between the fifth lens and the sixth lens, and the sixth spacing piece is placed between the sixth lens and the seventh lens. A maximal thickness CP6 of the sixth spacing piece along a direction of the optical axis is greater than a center thickness CT6 of the sixth lens on the optical axis. An inner diameter d5s of an object-side surface of the fifth spacing piece, an inner diameter d6s of an object-side surface of the sixth spacing piece, and a spacing distance T56 between the fifth lens and the sixth lens on the optical axis satisfy: 4.5<(d6s−d5s)/T56<8.0.