Six-Lens Optical Assembly for Compact High-Resolution Imaging
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Solution Overview
Problem
Conventional lens assemblies with five lenses fail to meet the demands of miniaturization and high resolution required for digital still cameras and mobile phones, particularly in terms of optical performance and field of view.
Innovation Solution
A lens assembly comprising a sequence of lenses with specific refractive powers and surface curvatures, including a biconvex first lens, meniscus lenses with negative and positive refractive powers, and a sixth meniscus lens with positive refractive power, arranged to satisfy conditions such as 0.8104≦f/TTL≦0.8201 and other focal length ratios, enhancing optical performance and field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional five-lens assembly is used, then the structure is relatively simple, but the resolution and optical performance cannot meet the requirements for miniaturization and high resolution
Solution Approach 1:
The lens assembly is divided into six distinct lens elements with specific refractive power configurations (positive, negative, and mixed). Each lens element has predetermined curvature and refractive power characteristics that work together to achieve high resolution. The segmentation into six lenses allows for better correction of optical aberrations and improved image quality compared to conventional five-lens assemblies.
Solution Approach 2:
The patent specifies precise parameter ranges for each lens element including refractive power (positive and negative values), curvature radii (R1 through R12), and thickness (d1 through d6). By optimizing these parameters within defined ranges, the assembly achieves both miniaturization and high resolution. The conditional expressions (1) through (6) establish specific parameter relationships that resolve the contradiction between complexity and performance.
2Length of moving object
If the lens assembly is miniaturized to reduce total length, then the device size is reduced, but the field of view and optical performance may deteriorate
Solution Approach 1:
The patent establishes specific parameter ranges including conditional expression (1) for focal length to total length ratio (0.35<TTL/f<0.50), and individual lens curvature and thickness parameters. These parameter optimizations enable the lens assembly to achieve a compact form factor while maintaining a wide field of view angle (35°<ω<60°) and excellent optical performance. The meniscus lens configurations with specific curvature radii are critical for achieving both miniaturization and wide field of view.
Solution Approach 2:
The patent employs meniscus lenses with specific curvature characteristics (convex and concave surfaces with different radii). The first meniscus lens has a convex object-side surface and concave image-side surface, while the second meniscus lens has opposite curvature. This curved surface design optimizes light path control within a compact space, enabling both miniaturization and wide field of view without sacrificing optical quality.
3Manufacturing precision
If more lens elements are added to improve resolution, then the optical performance is enhanced, but the total lens length and device complexity increase
Solution Approach 1:
The patent defines specific parameter ranges for six lens elements including focal lengths (f1 through f6), curvature radii (R1 through R12), and thickness (d1 through d6). Conditional expressions (2) through (6) establish optimal relationships between individual lens parameters and the overall system focal length f. These parameter optimizations enable high resolution with only six elements, avoiding the need for more lenses that would increase total length.
Solution Approach 2:
Each lens element is assigned specific local optical properties: the first lens has positive refractive power with specific curvature, the second lens has negative refractive power as a meniscus, the third lens has positive power, and so on. This localized optimization of each element's refractive power and curvature allows the compact six-lens assembly to achieve high resolution by correcting aberrations at each stage rather than requiring more lenses.
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 lens assembly achieves a shortened total lens length, increased field of view, effective aberration correction, and improved resolution, as demonstrated by longitudinal spherical aberration, astigmatic field curves, and distortion diagrams, ensuring good optical performance.
Implementation Method 1
The first lens is a biconvex lens with positive refractive power. The second lens is a meniscus lens with negative refractive power... The lens assembly satisfies the following conditions: 0.8104≦f/TTL≦0.8201, −0.4290≦f123/f456≦−0.4127
Data Source
AI summary
A lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is a biconvex lens with positive refractive power. The second lens is a meniscus lens with negative refractive power. The third lens is with positive refractive power and includes a convex surface facing the image side. The fourth lens is a meniscus lens with negative refractive power. The fifth lens is a meniscus lens with negative refractive power. The sixth lens is a meniscus lens with positive refractive power.