Optical Imaging Lens Assembly for Stray Light Blocking
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Solution Overview
Problem
Existing lens assemblies for smart wearable devices face challenges in achieving high image height and low stray light, with excessive stray light causing reflection issues that compromise imaging quality.
Innovation Solution
The optical imaging lens assembly comprises a specific configuration of lenses with convex and concave surfaces and supporting elements, optimized by parameters such as CT5/CT6, (d0m−d5s)/CT6, and other geometric relationships, to control stray light and enhance imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a lens assembly is designed to reduce stray light, then reflection problems between lenses are reduced, but the image height requirement cannot be guaranteed
Solution Approach 1:
The lens assembly is divided into multiple lens groups with different refractive powers and surface curvatures. Each lens group is designed to handle specific portions of the optical path, with the first lens group (negative refractive power) controlling stray light and the second lens group (positive refractive power) ensuring proper image height formation. This segmentation allows independent optimization of each function.
Solution Approach 2:
Different regions of the lens assembly are given different optical properties. The first lens has a specific curvature ratio (K1) and refractive power to control stray light at the object side, while the second lens has different parameters (K2, refractive power) to control image formation at the image side. This local differentiation of optical characteristics resolves the contradiction between stray light reduction and image height maintenance.
2Volume of moving object
If the lens assembly volume is reduced to fit smart wearable devices, then portability is improved, but impact resistance and imaging quality in outdoor environments cannot be guaranteed
Solution Approach 1:
Multiple lens groups with different functions are merged into a single compact assembly. The first lens group (negative refractive power) and second lens group (positive refractive power) are combined in close proximity, sharing the same optical axis and housing space. This merging achieves the required imaging quality and impact resistance within a reduced volume suitable for wearable devices.
Solution Approach 2:
The lens assembly uses specific parameter ranges to achieve compactness while maintaining performance. The curvature ratios (K1, K2), refractive powers, and spacing between lens groups are optimized to create a compact structure that delivers both impact resistance and high imaging quality in outdoor environments.
3Object-affected harmful factors
If supporting elements are added to block stray light paths, then stray light is reduced, but assembly complexity increases
Solution Approach 1:
The supporting elements serve multiple functions: they structurally support the lens groups, align the optical axis, and simultaneously block stray light paths. By designing the supporting elements to perform both structural and optical functions, the assembly complexity is minimized while still achieving effective stray light reduction.
Solution Approach 2:
The supporting elements act as intermediaries between the lens groups and the housing structure. These elements mediate both the mechanical assembly and the optical performance, blocking stray light paths while maintaining the precise positioning and alignment required for high imaging quality.
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 achieves both high image height and low stray light, meeting the high imaging quality requirements for smart wearable devices by effectively blocking stray light paths and improving assembly stability.
Implementation Method 1
a first lens having negative refractive power, its object-side surface being a convex surface and its image-side surface being a concave surface; a second lens having refractive power, its object-side surface being a concave surface and its image-side surface being a convex surface
Implementation Method 2
the supporting element group comprises a fifth supporting element disposed on the image side of the fifth lens and in contact with the image-side surface of the fifth lens
Data Source
AI summary
Disclosed is an optical imaging lens assembly. The optical imaging lens assembly includes: a lens barrel, a lens group, and a supporting element group disposed in the lens barrel. The lens group includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The supporting element group comprises a fifth supporting element disposed on the image side of the fifth lens and in contact with the image-side surface of the fifth lens. The optical imaging lens assembly satisfies: 2.25<CT5/CT6<3.05; 6.25<(d0m−d5s)/CT6<8.7, where CT5 is the central thickness of the fifth lens on the optical axis, CT6 is the central thickness of the sixth lens on the optical axis, d0m is the inner diameter of the image-side end surface of the lens barrel, and d5s is the inner diameter of the object-side surface of the fifth supporting element.