Projection Lens Assembly Aberration Control
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Solution Overview
Problem
Conventional projection lens assemblies face challenges in miniaturization and achieving high imaging quality due to increased lens count, which leads to larger size and distortion issues, especially when trying to maintain a large field-of-view.
Innovation Solution
A projection lens assembly comprising three lenses with specific refractive powers and surface types, where the third lens has a convex image-side surface, and the lenses are arranged to satisfy certain focal length and thickness ratios, ensuring a compact design and high light transmittance, thereby reducing aberrations and improving imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to eliminate aberrations and enhance resolution, then imaging quality is improved, but the total track length of the projection lens assembly increases
Solution Approach 1:
The patent applies parameter changes by carefully controlling the refractive powers, focal lengths, and spacing distances of the three lenses to achieve high imaging quality with reduced track length. Specific conditional expressions define optimal parameter ranges that balance aberration correction with compact size
Solution Approach 2:
The patent uses composite lens structures combining different refractive power lenses (positive and negative) to achieve superior optical performance. The combination of lenses with different properties allows aberration correction while maintaining a compact overall design
2Manufacturing precision
If the number of lenses is increased to eliminate aberrations, then imaging quality is improved, but the lens assembly size increases which is not conductive to miniaturization
Solution Approach 1:
The patent optimizes lens parameters including refractive powers, focal lengths, and spacing to achieve compact dimensions. The conditional expressions establish specific parameter relationships that enable miniaturization while maintaining high imaging quality through effective aberration correction
Solution Approach 2:
The patent divides the optical system into three distinct lens components with specific functions, allowing each lens to be optimized independently for aberration correction while contributing to the overall compact design. This segmentation enables efficient space utilization
3Area of stationary object
If a large field-of-view is achieved, then coverage area is improved, but distortion increases and imaging quality deteriorates
Solution Approach 1:
The patent controls distortion and maintains imaging quality across a large field-of-view by carefully adjusting lens parameters. The conditional expressions define optimal ranges for focal lengths, refractive powers, and spacing that balance wide coverage with minimal distortion
Solution Approach 2:
The patent applies local quality by optimizing different regions of the optical system to handle different field angles. The lens design provides superior correction for off-axis rays while maintaining on-axis performance, enabling large field-of-view with uniform high quality across the entire field
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 enables a compact, high-quality projection lens assembly with reduced distortion and improved imaging efficiency, suitable for portable electronic devices, while maintaining a large aperture and high light transmittance.
Implementation Method 1
a first lens having a positive refractive power or a negative refractive power; a second lens having a positive refractive power or a negative refractive power; and a third lens having a positive refractive power, wherein an image-side surface of the third lens may be a convex surface
Data Source
AI summary
The present disclosure discloses a projection lens assembly. The projection lens assembly includes, sequentially along an optical axis from an image-source side to an image side, a first lens having a positive refractive power or a negative refractive power; a second lens having a positive refractive power or a negative refractive power; and a third lens having a positive refractive power, wherein an image-side surface of the first lens is a convex surface. A distance TTL on the optical axis from an image-source plane of the projection lens assembly to the image-side surface of the third lens and a total effective focal length f of the projection lens assembly satisfy: TTL/f<1.4. An effective focal length f3 of the third lens and the total effective focal length f of the projection lens assembly satisfy: 0<f3/f<18.0.