Four-Lens Wide-Angle Optical System for Distortion Correction
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Solution Overview
Problem
Conventional wide-angle lens systems with an angle of view of 90° or more suffer from excessive distortion and are difficult to miniaturize, leading to increased production costs and prices due to the use of multiple lenses.
Innovation Solution
A wide-angle photographic lens system composed of four lenses, where the first lens has weak refractivity, the second lens has positive refractivity, the third lens has strong positive refractivity, and the fourth lens has negative refractivity, with specific design relations for focal lengths, lens thicknesses, and incidence angles to correct distortion and achieve smallness and high resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional wide-angle lens systems are designed to achieve an angle of view of 90° or more, then the angle of view is improved, but image distortion increases excessively
Solution Approach 1:
The lens system is divided into four distinct lens elements with different refractivities (weak positive, strong positive, negative, and positive), where each lens segment contributes differently to light refraction. This segmentation allows the system to achieve wide-angle view while correcting distortion through the combined optical effect of multiple specialized elements.
Solution Approach 2:
Each lens element is designed with specific local optical properties - the first lens has weak refractivity for initial light gathering, the second and third lenses have strong positive refractivity for focal control, and the fourth lens has negative refractivity for distortion correction. This local differentiation of optical qualities enables simultaneous achievement of wide angle of view and low distortion.
2Manufacturing precision
If conventional wide-angle lens systems use multiple lenses to correct distortion, then distortion correction is improved, but the system size increases and miniaturization becomes difficult
Solution Approach 1:
The patent merges multiple optical functions into a compact four-lens configuration where distortion correction, focal length control, and wide-angle achievement are integrated into a single unified system. The close spacing and specific arrangement of the four lenses allow them to work together synergistically, correcting distortion without requiring a large physical footprint.
Solution Approach 2:
The system achieves distortion correction by precisely controlling optical parameters - specifically the refractivity strength of each lens, the spacing between lenses, and the curvature radii of lens surfaces. By optimizing these parameters within a compact form factor, the system corrects distortion without increasing overall size.
3Reliability
If conventional wide-angle lens systems use many lenses, then optical performance is improved, but production cost increases
Solution Approach 1:
Instead of using many lens elements, the patent achieves sufficient optical performance with exactly four lenses - a minimal number that provides just enough optical correction for wide-angle applications. This partial action approach avoids the excessive use of lenses, reducing manufacturing complexity and cost while maintaining adequate optical performance for distortion correction and 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 system achieves a distortion-corrected wide-angle view of 90° or more while maintaining smallness and providing high-resolution images by optimizing refractivity, shape, and incidence angles, thereby reducing spherical and chromatic aberrations.
Implementation Method 1
a first lens, an iris, a second lens, a third lens and a fourth lens which are sequentially arranged along an optical axis from an object, wherein the first lens has weak refractivity, the second lens has positive refractivity, the third lens has strong positive refractivity, and the fourth lens has negative refractivity
Data Source
AI summary
A wide-angle photographic lens system enabling correction of distortion composed of four lenses, in which a first lens, an iris, a second lens, a third lens and a fourth lens sequentially arranged along an optical axis from an object, wherein the first lens has weak refractivity, the second lens has positive refractivity, the third lens has strong positive refractivity, and the fourth lens has negative refractivity, wherein the lens system satisfies relations, |f1/f|>4, f3/f<1.5, and te/tc<0.5, wherein f1 is a focal length of the first lens, f is a total focal length of all the lenses, f3 is a focal length of the third lens, to is a lens thickness on an effective diameter of a rear surface of the third lens, and tc is a center thickness of the third lens.