Optical Imaging Lens Assembly with Spacer-Based Stray Light Control
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Solution Overview
Problem
Existing optical imaging lens assemblies face challenges in improving stray light reduction due to internal reflections, which affect imaging quality, despite the use of light-shielding elements.
Innovation Solution
The optical imaging lens assembly incorporates a specific configuration of lens barrels, lens groups, and spacers, including a first and second lens group with spacers, where the internal diameter and focal lengths are constrained to minimize stray light, and the curvature and axial heights are controlled to enhance light shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-shielding element is added to intercept stray light, then some stray light is blocked, but the self stray light of the light-shielding element cannot be avoided
Solution Approach 1:
The patent introduces a light-shielding element positioned between the lens assembly and the image sensor to intercept stray light. This intermediary component blocks reflected light from reaching the sensor, thereby reducing stray light interference without requiring modification of the lens elements themselves.
Solution Approach 2:
The patent separates the light-shielding function from the lens assembly by introducing a dedicated light-shielding element. This extraction of the stray light control function allows the lens to focus on imaging while the separate element handles stray light interception, avoiding the self-stray light problem that would occur if the lens itself tried to perform both functions.
2Manufacturing precision
If multiple internal devices are used in the lens assembly, then imaging quality is improved through aberration compensation, but reflection of light among devices produces stray light
Solution Approach 1:
The patent converts the harmful effect of internal reflections into a beneficial one by strategically positioning light-shielding elements to intercept reflected light paths. The shielding elements are placed to block specific reflection paths while maintaining the optical function of the multiple lens elements, thereby converting the stray light problem into an opportunity for selective light path control.
Solution Approach 2:
The patent applies light-shielding elements at specific locations within the lens assembly where internal reflections occur. Rather than uniformly shielding the entire assembly, the shielding is applied locally at critical reflection points, maintaining optical quality in imaging regions while blocking stray light paths.
3Object-affected harmful factors
If the internal diameter of spacers is reduced to minimize stray light, then light shielding is improved, but structural stability may be compromised
Solution Approach 1:
The patent employs spacers with curved or rounded edges rather than sharp corners, which helps redirect stray light while maintaining structural integrity. The curved geometry of the spacers provides both optical benefit by reducing stray light reflections and mechanical benefit by distributing stress more evenly throughout the spacer structure.
Solution Approach 2:
The patent uses spacers made from composite materials or materials with specific optical and mechanical properties that allow thin-walled construction. These materials provide sufficient structural strength even with reduced wall thickness, enabling the spacers to have smaller internal diameters for better light shielding while maintaining the mechanical stability needed to hold lens elements in position.
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 reduces stray light, improves imaging quality by minimizing complex stray light reflections, and optimizes chromatic aberration, ensuring a compact structure and improved imaging performance.
Implementation Method 1
the first lens group includes a first lens, a second lens, and a third lens having a positive refractive power in sequence from an object side to an image side; the second lens group includes a fourth lens having a negative refractive power and a fifth lens
Data Source
AI summary
Provided in the disclosure is an optical imaging lens assembly. The optical imaging lens assembly includes a first lens barrel, a second lens barrel, a first lens group, a second lens group, and a plurality of spacers; the first lens group includes a first lens, a second lens, and a third lens having a positive refractive power in sequence from an object side to an image side; the second lens group includes a fourth lens having a negative refractive power and a fifth lens; the plurality of spacers at least include a first spacer, a second spacer, and a fourth spacer, and an internal diameter of the fourth spacer is minimum; and when −0.8<d4s/F2<0 is met, 0.1<EPB4/LB−R7/R8<0.5 is met. According to the disclosure, the problem in the related art of difficulties in stray light improvement in an optical imaging lens assembly is solved.