Five-element imaging lens with inflection points for wide angle
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a demand for an imaging lens that offers a wider angle of view while maintaining high performance and miniaturization, which is challenging for existing imaging lenses.
Innovation Solution
The proposed imaging lens configuration includes a first positive lens, a second negative or positive lens, a third lens with an inflection point and low thickness deviation ratio, a fourth positive lens with an inflection point on its peripheral portion, and a fifth negative lens with a concave surface and inflection point on its peripheral portion. These lenses are arranged to satisfy specific focal length conditions, ensuring a balance between optical performance and compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels of the solid-state imaging element is increased, then the imaging performance is improved, but the imaging lens requires higher optical performance and more complex design
Solution Approach 1:
The imaging lens is divided into five distinct lens elements (first lens L1, second lens L2, third lens L3, fourth lens L4, and fifth lens L5) with specific optical powers and surface characteristics. Each lens element is designed to correct specific aberrations, allowing the system to handle high pixel density requirements without excessive overall complexity.
Solution Approach 2:
Different lens elements are assigned different optical properties: the first lens has a convex object-side surface, the second lens has a concave image-side surface, the third lens has low thickness deviation ratio, the fourth lens has an inflection point on its peripheral portion, and the fifth lens has a concave image-side surface. This local differentiation of optical qualities enables precise aberration correction for high-performance imaging.
2Volume of moving object
If the imaging device is miniaturized for portability, then the device size is reduced, but the imaging lens must achieve both high performance and compact size which is challenging
Solution Approach 1:
The five lens elements are arranged in a compact sequence from the object side to the image side, with each subsequent lens positioned closely after the previous one. This nested arrangement minimizes the overall optical path length while maintaining the necessary optical power distribution, enabling miniaturization without sacrificing imaging performance.
Solution Approach 2:
The patent specifies precise parameter ranges for each lens element including focal lengths (f1, f2, f3, f4, f5), thickness deviations, and inflection point positions. By optimizing these parameters, the lens system achieves high optical performance in a compact form factor suitable for portable devices.
3Adaptability or versatility
If a wider angle of view is implemented, then the field of view is expanded, but maintaining high performance and bright imaging becomes more difficult
Solution Approach 1:
The lens elements are designed with asymmetric surface characteristics: the first lens has a convex object-side surface, the fourth lens has an inflection point on its object-side peripheral portion, and the fifth lens has an inflection point on its peripheral portion. These asymmetric designs help control off-axis rays effectively, enabling wider angle of view while maintaining image quality and brightness across the field.
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 solution achieves a bright, high-performance, and small imaging lens with a wide angle of view, effectively addressing the challenges of miniaturization and increased pixel density in imaging devices.
Implementation Method 1
the first lens and the second lens are bonded to each other
Data Source
AI summary
An imaging lens includes: a first lens to a fifth lens disposed in order from an object side. The first lens is a positive lens having a convex surface facing the object side. The second lens is a lens having a concave surface facing an image plane side. The third lens is a positive or negative lens having an inflection point on at least one surface with a low thickness deviation ratio. The fourth lens is a positive lens having a convex surface facing an image plane side and an inflection point on a lens peripheral portion on a surface on the object side. The fifth lens is a negative lens having a concave surface on an image plane side and an inflection point on a peripheral portion. The first lens and the second lens are bonded to each other.