Optical Image Lens with Doublets for Low Distortion
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Solution Overview
Problem
Designing an optical image lens with good image quality and low distortion is challenging due to constraints such as small size and cost, particularly in applications like portable electronic devices and vehicle imaging systems where temperature variations and high pixel density are factors.
Innovation Solution
The optical image lens is composed of multiple lenses with specific refractive powers and configurations, including doublets, to achieve low distortion and high image quality, with conditions such as 0.68<f/f1<0.97 and 0.28<f/f7<0.48, and the inclusion of an aperture, infrared filter, and protective glass to maintain optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple lenses with specific configurations are used to improve image quality and reduce distortion, then imaging quality is improved, but device complexity increases
Solution Approach 1:
The optical image lens is divided into multiple independent lens elements (first lens through eighth lens) with specific refractive powers and configurations. Each lens element can be independently designed and manufactured, allowing for precise control of optical properties while maintaining modular assembly. The segmentation enables correction of various aberrations including distortion by assigning specific functions to different lens elements.
Solution Approach 2:
The patent employs composite lens structures including doublets (lens groups with different refractive indices and Abbe numbers) to achieve superior optical performance. By combining materials with different optical properties, the system corrects chromatic and spherical aberrations while maintaining low distortion, thereby improving overall imaging quality without requiring excessive individual lens elements.
2Manufacturing precision
If more lens elements are added to reduce distortion, then distortion is reduced, but lens size increases
Solution Approach 1:
Each lens element is designed with specific local optical properties (refractive power, curvature radii, thickness) tailored to its position in the optical train. The first lens has positive refractive power with specific curvature configurations, while subsequent lenses have varying powers and shapes optimized for their local function in correcting distortion and other aberrations, enabling compact overall design.
Solution Approach 2:
The patent utilizes precise control of optical parameters including focal lengths, curvature radii, thicknesses, and refractive indices of each lens element. By optimizing these parameters within specific ranges (e.g., focal length ratios, curvature relationships), the system achieves low distortion with a compact form factor, avoiding unnecessary increases in lens size while maintaining high imaging 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
This configuration effectively improves image quality and reduces distortion, meeting the requirements for high-resolution imaging in various environments while considering size and cost constraints.
Implementation Method 1
an optical image lens comprises, from an object side to an image side along an optical axis, a first lens having positive refractive power, a second lens, a third lens bonded with the second lens to form a first doublet having positive refractive power
Data Source
AI summary
An optical image lens used in narrow field of view and having compact size and low distortion characteristics is disclosed to include, from an object side to an image side along an optical axis, a first lens with positive refractive power, a second lens and a third lens glued as a doublet with negative refractive power, a fourth lens and a fifth lens glued as a doublet with positive refractive power, a sixth lens with positive refractive power, a seventh lens with positive refractive power, and an eighth lens with negative refractive power.