Six-Lens Imaging System for Wide Angle and Short Length
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Solution Overview
Problem
Current imaging lenses for portable devices, such as smartphones and tablets, face challenges in achieving a wide angle of view while maintaining a sufficient back focus and shortening the total lens length, with existing solutions offering either too narrow angles of view or insufficient back focus.
Innovation Solution
A six-lens imaging lens configuration comprising a biconvex first lens, a negative meniscus second lens, a meniscus third lens, a concave fourth lens, a positive fifth lens, and a negative sixth lens, optimized with specific refractive powers and aspherical surfaces to satisfy conditional formulae ensuring a wide angle of view, adequate back focus, and a short total length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to improve imaging performance, then imaging quality is improved, but total lens length increases
Solution Approach 1:
The patent employs a nested lens configuration where multiple lens elements are arranged in a compact sequence. The six lenses are positioned closely together with optimized spacing, creating a nested structure that maximizes imaging performance while minimizing the overall lens length. This nested arrangement allows light to pass through multiple optical elements without requiring excessive axial space.
Solution Approach 2:
The patent utilizes aspherical surfaces on multiple lens elements to change the optical parameters of the system. By introducing aspherical geometry, the lens can achieve superior aberration correction and imaging performance without requiring additional lens elements, thereby maintaining a compact total length while improving manufacturing precision.
2Shape
If the total lens length is shortened to achieve wide angle of view, then angle of view is widened, but back focus becomes insufficient
Solution Approach 1:
The patent addresses the back focus issue by optimizing the radial dimensions of the lens elements. The aspherical surfaces are designed with specific curvature profiles that control light convergence in the radial direction, allowing the system to achieve wide angle of view while maintaining adequate back focus distance through clever dimensional optimization rather than simply extending the axial length.
Solution Approach 2:
By changing the geometric parameters of the lens surfaces to aspherical shapes, the patent can independently control different optical paths. This allows optimization of the angle of view parameter while simultaneously maintaining the back focus parameter, resolving the contradiction between these two requirements in a compact lens design.
3Length of moving object
If the total lens length is shortened for miniaturization, then device size is reduced, but imaging performance deteriorates
Solution Approach 1:
The patent employs aspherical surfaces on multiple lens elements to achieve superior imaging performance in a compact form. The aspherical curvature allows for more precise control of light rays, particularly at marginal zones, enabling high-resolution imaging without requiring a longer focal length. This curved surface optimization compensates for the reduced optical path length in the miniaturized design.
Solution Approach 2:
Each lens element in the six-element configuration is designed with multi-functionality, where each element contributes to multiple optical corrections simultaneously. The aspherical surfaces are optimized to correct spherical aberration, coma, and field curvature while also contributing to the overall focusing function, allowing compact dimensions without sacrificing imaging performance.
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 high imaging performance with a wide angle of view and sufficient back focus, compatible with high-pixel imaging elements, resulting in high-resolution images from central to peripheral angles of view.
Implementation Method 1
a first lens of a biconvex shape; a second lens having a negative refractive power and is of a meniscus shape with a concave surface toward the image side; a third lens of a meniscus shape with a convex surface toward the object side; a fourth lens of a meniscus shape with a concave surface toward the object side; a fifth lens having a positive refractive power; and a sixth lens having a negative refractive power and a concave surface toward the image side
Data Source
AI summary
An imaging lens is constituted essentially by six lenses, including: a first lens of a biconvex shape; a second lens having a negative refractive power and is of a meniscus shape with a concave surface toward the image side; a third lens of a meniscus shape with a convex surface toward the object side; a fourth lens of a meniscus shape with a concave surface toward the object side; a fifth lens having a positive refractive power; and a sixth lens having a negative refractive power and a concave surface toward the image side, provided in this order from the object side.