Six-element Aspheric Optical Lens for Compact Sensor Aberration Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the field of photography, there is a need for optical lenses that are compact in size, have low optical aberration, and high tolerance endurance, especially as image sensors become smaller and pixel size decreases, leading to increased color aberration challenges.
Innovation Solution
The optical lens design consists of multiple symmetrical lens elements with aspheric surfaces, optimized using specific geometric and refractive parameters to minimize aberrations and maintain a compact size, including a configuration of first to sixth lens elements and an optical filter, with aspherical surfaces shaped according to a specific formula to reduce color aberration and improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the size of image sensor is reduced to make the optical system more compact, then the length of optical system is reduced, but the pixel size becomes smaller leading to increased color aberration
Solution Approach 1:
The optical lens is divided into six distinct lens elements with different optical powers and material properties. Each lens element is designed with specific refractive index and Abbe number characteristics to collectively correct color aberration while maintaining a compact overall length suitable for small image sensors
Solution Approach 2:
The patent employs multiple lens elements made from different glass materials with varying refractive indices and Abbe numbers. This composite material approach allows for effective dispersion correction and color aberration control in a compact optical system configuration
2Length of moving object
If the pixel size is reduced to maintain resolution in smaller sensors, then the optical system length is reduced, but the color aberration becomes more significant
Solution Approach 1:
Each lens element is assigned specific local optical properties including particular refractive index ranges and Abbe number ranges. The first lens element has positive power with specific material characteristics, while subsequent elements have varying powers and material properties tailored to correct specific types of aberrations at different positions in the optical path
Solution Approach 2:
The patent systematically varies key optical parameters including refractive index (N), Abbe number (V), radius of curvature (R), and thickness (d) across the six lens elements. These parameter changes are optimized to minimize color aberration while maintaining compact dimensions for small sensor applications
3Manufacturing precision
If multiple lens elements are added to reduce aberration, then the optical quality is improved, but the device complexity increases
Solution Approach 1:
The patent incorporates aspheric surfaces in the lens element design to correct spherical aberration and other optical defects. The aspheric profiles are defined by specific mathematical equations with coefficients optimized to reduce the number of elements needed while achieving high 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 solution effectively reduces longitudinal spherical aberration, lateral color aberration, field curvature, and distortion, ensuring high image quality and tolerance sensitivity while maintaining a compact optical system.
Implementation Method 1
an optical lens includes, in order from an object side to an image side, a first lens element having negative power with a first aspheric surface and a second aspheric surface, a second lens element having positive power with a third aspheric surface and a fourth aspheric surface
Implementation Method 2
aspherical surfaces shaped according to a specific formula to reduce color aberration and improve image quality
Data Source
AI summary
An optical lens of the present disclosure assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, an optical filter and a sensor. The optical lens also has an axis. The first lens element, the fourth lens element and the sixth lens element have negative power. The second lens element, the third lens element and the fifth lens element have positive power.