Seven-Lens Imaging System for Telecentric Aberration Correction
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Solution Overview
Problem
Existing imaging lenses lack telecentricity and sufficient correction of aberrations such as distortion and chromatic aberration, particularly with the increasing number of pixels in projection-type display and digital imaging devices, making them inadequate for modern applications.
Innovation Solution
An imaging lens configuration comprising a series of lenses with specific refractive powers and Abbe numbers, including a first positive lens, a second positive lens, a third negative lens, a fourth negative lens, a fifth positive lens, a sixth positive lens, and a seventh positive lens, which satisfy certain conditional expressions to ensure telecentricity and effective aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing imaging lens configurations are used, then the device can be kept simple, but telecentricity is not achieved and aberration correction is insufficient
Solution Approach 1:
The imaging lens is divided into seven distinct lens elements with specific positive and negative refractive powers arranged in a predetermined sequence. This segmentation allows each lens element to contribute to correcting specific aberrations while collectively achieving telecentricity, resolving the contradiction between optical performance and structural simplicity.
Solution Approach 2:
Each lens element is assigned specific local optical properties including refractive index, Abbe number, and curvature characteristics. The patent specifies that certain lens elements must have positive refractive power while others have negative refractive power, with each element's properties optimized for its specific position in the sequence to achieve overall telecentricity and aberration correction.
2Measurement precision
If the number of pixels in image display devices and imaging devices is increased, then imaging quality is improved, but the requirements for aberration correction and telecentricity become more stringent
Solution Approach 1:
The patent establishes specific parameter ranges for each lens element including refractive index (nd), Abbe number (vd), radius of curvature (R), and axial thickness (d). By controlling these parameters within specified ranges and satisfying conditional expressions relating focal lengths and Abbe numbers, the lens system achieves the precision required for high-pixel-density applications.
Solution Approach 2:
The patent provides conditional expressions that relate the focal lengths of different lens element groups (f23, f45, f15) and their ratios to the overall focal length (f). These dynamic relationships ensure that the lens system maintains telecentricity and proper aberration correction across different imaging conditions and pixel densities.
3Volume of moving object
If a small number of lenses are used to reduce size, then device compactness is achieved, but telecentricity and aberration correction are compromised
Solution Approach 1:
The lens system uses exactly seven lens elements in a specific sequence (positive, positive, negative, negative, positive, positive, positive), which is the minimum configuration required to achieve telecentricity. This segmented approach allows the compact lens system to meet the telecentricity requirement while maintaining a manageable size suitable for mobile and portable applications.
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 proposed lens configuration achieves high optical performance with satisfactory correction of various aberrations, including distortion and chromatic aberration, while maintaining telecentricity, thus meeting the demands of modern imaging devices with increased pixel density.
Implementation Method 1
an imaging lens consisting of, in order from a magnified side: a first lens L1 having a positive refractive power, a second lens L2 having a positive refractive power, a third lens L3 having a negative refractive power, a fourth lens L4 having a negative refractive power, a fifth lens L5 having a positive refractive power, a sixth lens L6 having a positive refractive power, and a seventh lens L7 having a positive refractive power
Data Source
AI summary
The imaging lens consists of, in order from a magnified side, a first lens having a positive refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a negative refractive power, a fifth lens having a positive refractive power, a sixth lens having a positive refractive power, and a seventh lens having a positive refractive power, and satisfies predetermined Conditional Expressions (1) and (2) relating to Abbe numbers of the second lens to the fifth lens.