Five-Lens Optical Assembly for Ultra-Thin Aberration Control
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Solution Overview
Problem
Conventional optical lens assemblies struggle to achieve both miniaturization and high imaging quality.
Innovation Solution
An optical lens assembly with a specific configuration of lenses, spacers, and focal lengths, including a second lens with a center thickness less than 0.4 mm, controlled focal lengths and spacings, and optimized radii of curvature, to enhance imaging quality and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the optical lens assembly uses conventional lens configurations, then the imaging quality can be maintained, but the assembly size and thickness cannot be reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the focal length of the second lens (f2), its center thickness (CT2 < 0.4mm), the air spacing between the second and third lenses (T23), and the spacer thickness (CP2). These parameter optimizations enable miniaturization while maintaining imaging quality through mathematical relationships that balance optical performance with compact dimensions.
Solution Approach 2:
The patent implements local quality by making the second lens have a center thickness less than 0.4mm, which is thinner than other lenses in the assembly. This localized thinning of the second lens contributes to overall miniaturization while the specific focal length and spacing parameters ensure that imaging quality is not compromised in this critical region.
2Length of moving object
If the second lens is made thinner to reduce assembly thickness, then ultra-thin performance is achieved, but optical performance may deteriorate
Solution Approach 1:
The patent resolves this contradiction by changing multiple parameters simultaneously: the second lens center thickness (CT2 < 0.4mm), its focal length (f2), the air spacing (T23), and the spacer thickness (CP2). These coordinated parameter changes ensure that the thinned second lens still achieves the required optical performance through optimized light path control.
Solution Approach 2:
The patent applies preliminary anti-action by pre-calculating and constraining the relationship between the second lens parameters and the third lens position (T23). This preliminary design ensures that when the second lens is thinned, the optical system compensates through the controlled air spacing and spacer configuration, preventing optical performance deterioration before assembly.
3Volume of moving object
If the lens assembly is miniaturized, then compactness is improved, but aberration control becomes more difficult
Solution Approach 1:
The patent controls aberrations in the miniaturized assembly by optimizing the focal length of the second lens (f2) and its relationship with other lens parameters. The constrained parameters including CT2, T23, and CP2 work together to maintain proper light path geometry, ensuring aberration control is achieved despite the reduced overall volume and tighter spacing between 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 solution achieves high imaging quality and miniaturization by controlling aberrations, reducing stray light, and ensuring ultra-thin performance.
Implementation Method 1
five lenses comprising a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially from an object side to an image side
Data Source
AI summary
An optical lens assembly, including: a lens barrel; five lenses arranged sequentially along optical axis; a first spacer, in contact with at least part of an image-side surface of a first lens; a second spacer, in contact with at least part of an image-side surface of the second lens; and a focal length f2 of the second lens, the center thickness CT2 of the second lens on the optical axis, an air spacing T23 between the second lens and a third lens on the optical axis, a maximum thickness CP2 of the second spacer, and a distance EP12 between an image-side surface of the first spacer and an object-side surface of the second spacer along the optical axis satisfy: −50.0<f2/(CT2+T23)+f2/(EP12+CP2)<0.