Five-Lens Imaging System with Inflection Points for Compact High Resolution
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Solution Overview
Problem
There is a demand for imaging lenses with high resolution performance that can be miniaturized to fit smaller devices such as cellular phones and smartphones, while also reducing the total length of the lens system to accommodate increasing pixel counts and maintain optical performance from central to peripheral angles of view.
Innovation Solution
The imaging lens is composed of five lenses, including a first lens with positive refractive power and a meniscus shape convex toward the object side, a second biconcave lens, a third lens with a meniscus shape convex toward the object side, a fourth lens with a meniscus shape convex toward the image side, and a fifth lens with negative refractive power and at least one inflection point on the image side surface, optimized to satisfy specific focal length ratios and refractive power conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the imaging lens is composed of five or six lenses to achieve high resolution performance, then the imaging performance is improved, but the total length of the lens system increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices and curvatures of each lens element. Specifically, it sets the refractive index of the first lens to 1.6 or higher, the second lens to 1.5 or higher, and the third lens to 1.7 or higher, while optimizing their respective curvatures and spacing to achieve high resolution in a compact configuration
Solution Approach 2:
The patent uses composite optical materials with specific refractive index combinations. The lens system employs materials with refractive indices of 1.6 or higher for the first lens, 1.5 or higher for the second lens, and 1.7 or higher for the third lens, creating a composite optical system that achieves superior resolution performance while maintaining a reduced total length
2Length of stationary object
If the total length of the lens is decreased to fit smaller devices, then the device miniaturization is achieved, but the imaging performance from peripheral angle of view deteriorates
Solution Approach 1:
The patent applies local quality by optimizing each lens element's specific properties for its particular function in the system. The first lens has a meniscus shape convex toward the object side with specific curvature, the second lens is biconcave with specific curvature, and the third lens has a meniscus shape convex toward the object side with specific curvature, allowing each element to contribute optimally to correcting aberrations across the entire field of view including peripheral regions
Solution Approach 2:
The patent utilizes curved surfaces instead of flat ones to correct optical aberrations. The first lens has a meniscus shape convex toward the object side, the second lens is biconcave, and the third lens has a meniscus shape convex toward the object side, with each curvature specifically designed to control light paths and correct aberrations, thereby maintaining imaging performance from central to peripheral angles of view while reducing total lens 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 configuration achieves high resolution performance across the entire field of view while reducing the total length of the lens system, enhancing imaging performance and allowing for higher pixel density without compromising optical quality.
Implementation Method 1
an imaging lens substantially consisting of, in order from an object side, five lenses of: a first lens that has a positive refractive power and has a meniscus shape which is convex toward the object side; a second lens that has a biconcave shape; a third lens that has a meniscus shape which is convex toward the object side; a fourth lens that has a meniscus shape which is convex toward an image side; and a fifth lens that has a negative refractive power and has at least one inflection point on an image side surface
Data Source
AI summary
An imaging lens substantially consists of, in order from an object side, five lenses of a first lens that has a positive refractive power and has a meniscus shape which is convex toward the object side, a second lens that has a biconcave shape, a third lens that has a meniscus shape which is convex toward the object side, a fourth lens that has a meniscus shape which is convex toward the image side; and a fifth lens that has a negative refractive power and has at least one inflection point on an image side surface. Further, the following conditional expression (1) is satisfied.1.4<f/f1<4 (1)