Four-Lens Optical Imaging Assembly with Negative First Element
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Solution Overview
Problem
Existing imaging lens assemblies with an F-number of 2.0 or above fail to meet high-order imaging requirements, especially in low-light conditions and hand trembling situations, and require a balance of miniaturization, lightweight, and high imaging quality for portable electronic products, including infrared applications.
Innovation Solution
An optical imaging lens assembly comprising four lenses with specific refractive powers and surface types, arranged along an optical axis, where the first lens has negative refractive power, the second and third lenses have positive refractive powers, and the fourth lens has a convex object-side surface, optimized with constraints on center thickness, edge thickness, and radii of curvature to achieve a large aperture and high relative illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the F-number is increased to 2.0 or above for miniaturization, then the lens assembly size is reduced, but the imaging quality deteriorates in low-light conditions
Solution Approach 1:
The patent changes the F-number parameter from 2.0 or above to below 2.0, specifically achieving Fno < 1.5 in some embodiments. This parameter change allows the lens assembly to gather more light, improving imaging quality in low-light conditions while maintaining a compact form factor through optimized optical design
2Illumination intensity
If the aperture is enlarged for high relative illumination, then the light gathering ability is improved, but the lens assembly size increases
Solution Approach 1:
The patent optimizes the F-number parameter to be below 2.0, which directly improves relative illumination by allowing more light to pass through the lens system. This is achieved through careful selection of lens curvatures, thicknesses, and spacing, enabling high illumination intensity without proportionally increasing the overall lens assembly volume
3Volume of moving object
If the lens assembly is miniaturized for portable devices, then the device size is reduced, but the field-of-view and imaging quality are limited
Solution Approach 1:
The patent divides the optical system into four distinct lens elements with specific refractive power distributions (first lens: negative, second lens: positive, third lens: positive, fourth lens: positive). This segmentation allows each element to contribute differently to the overall optical performance, enabling a compact design that achieves both wide field-of-view and high imaging quality through coordinated action of multiple specialized components
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 configuration results in a lens assembly that is miniaturized, offers a large field-of-view, high relative illumination, and improved imaging quality, suitable for portable electronic products and infrared detection applications.
Implementation Method 1
The first lens has a negative refractive power
Implementation Method 2
the second lens has a positive refractive power
Implementation Method 3
the third lens has a positive refractive power
Implementation Method 4
the fourth lens has a positive refractive power, and an object-side surface of the fourth lens may be a convex surface
Data Source
AI summary
An optical imaging lens assembly is provided. The optical imaging lens assembly includes, sequentially along an optical axis from an object side to an image side, a first lens, a second lens, a third lens, and a fourth lens. The first lens has a negative refractive power. The third lens has a positive refractive power. At least one of the second lens or the fourth lens has a positive refractive power. A center thickness CT2 of the second lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy: CT2/CT4<0.5.