Compact Optical Lens Assembly with Peripheral Surface Modifications
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Solution Overview
Problem
Conventional optical lens assemblies for portable electronic devices face challenges in achieving favorable image quality and microminiaturization, with existing designs often exceeding 50mm in dimension and f-number above 4, which is not suitable for modern consumer electronics.
Innovation Solution
The optical lens assembly design includes specific lens elements with convex and concave surface portions, optimizing the arrangement to satisfy conditions such as (TTL×Fno)/EFL≤2.2, 2.8 mm≤TTL≤8 mm, and HFOV≤25°, allowing for a reduced system length and enhanced ability to capture distant objects with improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the optical lens assembly is scaled down to reduce dimension, then the size is reduced, but the image quality deteriorates
Solution Approach 1:
The patent applies local quality by giving different surface characteristics to different regions of the lens elements. Specifically, the first lens element has a convex portion in its periphery, the third lens element has a concave portion in its periphery, and the fourth lens element has a convex portion in its periphery. These localized surface modifications allow the lens assembly to maintain favorable image quality while achieving microminiaturization, as the peripheral portions contribute to aberration correction in the compact configuration.
Solution Approach 2:
The patent employs parameter changes by optimizing specific geometric parameters of the lens elements to achieve both compact size and good image quality. The design satisfies specific parameter relationships: (TTL×Fno)/EFL≤2.2, 2.8 mm≤TTL≤8 mm, and HFOV≤25°. By carefully controlling these parameters, the lens assembly achieves reduced dimension while maintaining manufacturing precision and image quality.
2Manufacturing precision
If the aperture stop is increased to improve image quality, then the light gathering ability is improved, but the system length increases
Solution Approach 1:
The patent resolves this contradiction by optimizing the f-number parameter within a specific range that allows for a large aperture stop while maintaining a compact system length. The design satisfies (TTL×Fno)/EFL≤2.2, which balances the aperture size (affecting image quality) with the system length constraint. This parameter optimization enables the lens assembly to achieve both improved image quality through a larger aperture and reduced system length.
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
This design achieves a compact optical lens assembly with a large aperture stop, enabling better image quality and distant object photography without increasing the length, thus addressing the limitations of conventional designs.
Implementation Method 1
Each of the first lens element to the fourth lens element includes an object-side surface that faces the object side and allows an imaging ray to pass through and an image-side surface that faces image side and allows the imaging ray to pass through
Data Source
AI summary
An optical lens assembly includes first, second, third, and fourth lens elements arranged in order from an object side to an image side along an optical axis. Each lens element has an object-side surface and an image-side surface. The object-side surface of the first lens element has a convex portion in a vicinity of a periphery. The second lens element has negative refracting power. The object-side surface of the third lens element has a concave portion in a vicinity of a periphery. The image-side surface of the fourth lens element has a convex portion in a vicinity of a periphery.