Seven-Lens Imaging System for Wide Angle and Compact Length
Solution Overview
Problem
Current imaging lenses for compact devices like smartphones and tablets face challenges in achieving a wider angle of view while maintaining a short total length and high imaging performance across central and peripheral angles.
Innovation Solution
A seven-lens imaging lens configuration is developed, featuring lenses with specific refractive powers and shapes, including aspherical surfaces, to optimize optical performance and satisfy conditional formulae for focal lengths and radii of curvature, ensuring a short total length and wide angle of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a five lens configuration or six or more lenses are used to improve imaging performance, then high resolution and performance are achieved, but the total length of the imaging lens increases
Solution Approach 1:
The patent applies parameter changes by optimizing the focal lengths, refractive powers, and curvature radii of the seven lens elements according to specific conditional formulas. By carefully adjusting these optical parameters and using aspherical surfaces, the lens achieves high imaging performance (correcting aberrations) while maintaining a compact total length, resolving the contradiction between performance and size.
2Adaptability or versatility
If the number of lenses is increased to seven or more to achieve wider angle of view, then angle of view is widened, but the total length and complexity of the lens increase
Solution Approach 1:
The patent applies local quality by giving specific characteristics to particular lens elements: the first lens has positive refractive power with convex object-side surface, the fifth lens is meniscus-shaped with convex image-side surface, and the seventh lens has negative refractive power with concave image-side surface. These localized optical properties enable wide angle of view while controlling overall length.
Solution Approach 2:
The patent employs aspherical surfaces on multiple lens elements (second, third, fourth, and sixth lenses) to correct optical aberrations and enable wide angle of view. The aspherical shapes allow better light control at peripheral angles while maintaining a compact lens structure, achieving wide angle without proportionally increasing length.
3Length of stationary object
If a seven lens configuration is used to achieve wide angle of view and short total length, then angle of view is widened and length is shortened, but imaging performance at peripheral angles may deteriorate
Solution Approach 1:
The patent uses aspherical surfaces on the second, third, fourth, and sixth lenses to correct optical aberrations at peripheral angles. These aspherical shapes enable the lens to maintain high imaging performance across the entire field of view while achieving a wide angle of view and compact total length, resolving the contradiction between size and peripheral image quality.
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 widened angle of view and high imaging performance from central to peripheral angles, suitable for compact devices, outperforming existing lenses in terms of resolution and angle coverage.
Implementation Method 1
a first lens having a positive refractive power and a convex surface toward the object side; a second lens, of which at least one surface is of an aspherical shape; a third lens, of which at least one surface is of an aspherical shape; a fourth lens, of which at least one surface is of an aspherical shape; a fifth lens having a positive refractive power and is of a meniscus shape with a convex surface toward the image side; a sixth lens, of which at least one surface is of an aspherical shape; and a seventh lens having a negative refractive power and a concave surface toward the image side
Data Source
AI summary
An imaging lens is essentially constituted by seven lenses, including: a positive first lens having a convex surface toward the object side; a second lens, of which at least one surface is of an aspherical shape; a third lens, of which at least one surface is of an aspherical shape; a fourth lens, of which at least one surface is of an aspherical shape; a positive fifth lens of a meniscus shape with a convex surface toward the image side; a sixth lens, of which at least one surface is of an aspherical shape; and a negative seventh lens having a concave surface toward the image side, provided in this order from the object side. The imaging lens satisfies a predetermined conditional formula.