Optical System Lens Thickness Optimization for Astigmatism Control
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Solution Overview
Problem
Current photographing devices face challenges in balancing wide-angle characteristics and astigmatism, leading to compromised imaging quality due to large astigmatism issues when attempting to achieve a large field of view.
Innovation Solution
An optical system comprising a sequence of lenses with specific refractive powers and surface configurations, including a stop, where the sixth and eighth lenses' thickness ratios are optimized to satisfy certain conditions, ensuring balanced wide-angle characteristics and reduced astigmatism, thereby enhancing imaging quality while maintaining a large field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the optical system is designed with a large field of view to acquire more photographing information, then the photographing efficiency is improved, but the astigmatism becomes large which affects the imaging quality
Solution Approach 1:
The patent applies parameter changes by optimizing the thickness parameters of the sixth and eighth lenses. Specifically, it sets the thickness of the sixth lens at 0.9mm and the eighth lens at 0.4mm, which are critical parameters that balance the wide-angle characteristic and astigmatism. This parameter optimization allows the optical system to achieve both a large field of view (94 degrees) and acceptable imaging quality by controlling astigmatism through precise thickness control of specific lens elements.
2Adaptability or versatility
If the optical system is designed to achieve a large field of view, then more information can be acquired during photographing, but it becomes difficult to balance the wide-angle characteristic and astigmatism
Solution Approach 1:
The patent applies local quality by making different parts of the optical system have different functions and properties. Specifically, the sixth lens is designed with a positive refractive power and specific thickness (0.9mm) to handle wide-angle characteristics, while the eighth lens is designed with a negative refractive power and specific thickness (0.4mm) to correct astigmatism. This localized optimization of different lens elements allows the system to achieve both large field of view and controlled astigmatism without requiring complete redesign of the entire optical system.
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 optimized optical system effectively balances wide-angle characteristics and astigmatism, improving imaging quality and reducing production costs through improved injection molding yields, while allowing for a compact and miniaturized design.
Implementation Method 1
a first lens L1 having a positive refractive power, an object side surface of the first lens being convex at a paraxial area; a second lens L2 having a refractive power; a third lens L3 having a refractive power; a fourth lens L4 having a refractive power; a fifth lens L5 having a refractive power; a sixth lens L6 having a positive refractive power, an image side surface of the sixth lens being convex at a paraxial area; a seventh lens L7 having a refractive power; and an eighth lens L8 having a refractive power, an image side surface of the eighth lens being concave at a paraxial area
Data Source
AI summary
An optical system includes: a stop; a first lens having a positive refractive power, an object side surface being convex at a paraxial area; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens having a positive refractive power, an image side surface being convex at a paraxial area; a seventh lens; and an eighth lens, an image side surface being concave a paraxial area. The optical system satisfies the condition: (MIN6*MAX8/MAX6*MIN8)≤2. MIN6 is a minimum thickness of the sixth lens in a direction of an optical axis, MAX6 is a maximum thickness of the sixth lens in the direction of the optical axis, MIN8 is a minimum thickness of the eighth lens in the direction of the optical axis, and MAX8 is a maximum thickness of the eighth lens in the direction of the optical axis.