Six-Lens Imaging System with Aspherical Correction
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Solution Overview
Problem
There is a demand for miniaturization and reduced length of imaging lenses in devices such as smartphones and tablets, while maintaining high imaging performance and resolution, as existing six-lens configurations do not adequately meet the need for shorter total length and increased pixel density.
Innovation Solution
A six-lens imaging lens configuration with specific refractive power distributions and aspherical surface shapes, optimized by satisfying conditional formulae, which includes a combination of positive and negative refractive powers and aspherical surfaces to achieve a shorter total length and improved imaging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a six-lens configuration is used, then imaging performance and resolution are improved, but the total length of the lens becomes excessive for miniaturized devices
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive powers (f1, f3, f56) and surface curvatures (R3f, R3r, R4f, R4r) of each lens element to satisfy specific conditional formulas. This allows the six-lens system to achieve high imaging performance while reducing the total length to 4.156mm, resolving the contradiction between imaging quality and miniaturization.
Solution Approach 2:
The patent utilizes aspherical surfaces on the sixth lens (with specific curvature parameters A6, A7, A8) to improve imaging performance and reduce aberrations. The aspherical design allows for compact lens spacing while maintaining high resolution, effectively addressing the total length constraint in the six-lens configuration.
2Length of moving object
If the total length of the lens is shortened, then miniaturization is achieved, but imaging performance and resolution deteriorate
Solution Approach 1:
The patent maintains high imaging performance in the shortened lens by optimizing parameters such as the ratio f/f3 (0.55-0.65), f/f56 (0.95-1.05), and surface curvature ratios (R3r/R3f, R4r/R4f). These controlled parameter changes ensure that the reduced total length of 4.156mm does not compromise resolution or imaging quality.
Solution Approach 2:
The patent employs a composite lens system combining six different lens elements with varying refractive powers and material properties. This composite structure allows the short lens to correct various optical aberrations effectively, maintaining high imaging performance despite the reduced total length.
3Measurement precision
If the number of lenses is increased to improve imaging performance, then device complexity increases
Solution Approach 1:
The patent manages the complexity of the six-lens configuration by establishing specific parameter relationships through conditional formulas (f1, f3, f56 ratios and curvature relationships). These formulas provide a systematic design framework that simplifies the optimization process and makes the complex six-lens system more controllable and manufacturable.
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 configuration achieves a shorter total lens length while maintaining high imaging performance and resolution, effectively addressing the need for miniaturization in portable devices by optimizing the refractive powers and surface shapes of the lenses.
Implementation Method 1
a sixth lens having a negative refractive power, of which the surface toward the image side is of an aspherical shape which is concave in the vicinity of the optical axis and convex at the peripheral portion thereof
Data Source
AI summary
An imaging lens is constituted essentially by six lenses, including, in order from the object side to the image side: a first lens having a positive refractive power and a convex surface toward the object side; a second lens having a negative refractive power; a third lens having a positive refractive power and is of a biconvex shape; a fourth lens having a positive refractive power; a fifth lens having a negative refractive power and a concave surface toward the object side; and a sixth lens having a negative refractive power, of which the surface toward the image side is of an aspherical shape which is concave in the vicinity of the optical axis and convex at the peripheral portion thereof. Predetermined conditional formulae are satisfied.