Three-Lens Optical System Aberration Control
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Solution Overview
Problem
Conventional optical systems for portable electronic devices face challenges such as large aberration, poor image quality at the periphery, and manufacturing difficulties due to the need for large apertures and wide-angle lenses, which also suffer from distortion and high pixel requirements.
Innovation Solution
A compact optical image capturing system using a combination of refractive powers and aspheric surfaces in three-piece lenses, including inflection points on the third lens, to increase light entry and improve imaging quality, while maintaining a small size and high optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a two-piece lens is used in conventional optical systems, then the device complexity is reduced, but the optical performance deteriorates due to large aberration and poor image quality at periphery
Solution Approach 1:
The patent divides the lens system into three separate lens elements (first lens, second lens, third lens) arranged along the optical axis. This segmentation allows each lens to be optimized for specific functions: the first lens for light gathering, the second lens for aberration correction, and the third lens for focal length adjustment. The segmented structure enables better control over optical performance while maintaining reasonable device complexity.
Solution Approach 2:
The patent applies different surface characteristics to different parts of the lens system. Specifically, the third lens incorporates an inflection point on its image-side surface, creating a localized geometric feature that specifically addresses peripheral aberration correction. This local modification allows targeted optimization of image quality at the periphery without compromising the entire lens structure.
2Illumination intensity
If a large aperture is used to increase light intake, then the illumination intensity is improved, but the aberration increases and image quality at periphery deteriorates
Solution Approach 1:
The three-piece lens structure allows the system to achieve large aperture (f/1.8) while distributing the optical functions across multiple elements. The first lens handles light gathering, the second lens corrects aberrations introduced by the large aperture, and the third lens fine-tunes the focal properties. This segmentation enables the system to simultaneously achieve high illumination intensity and good aberration correction.
Solution Approach 2:
The patent changes the geometric parameters of the lens system by introducing an inflection point on the image-side surface of the third lens. This parameter modification creates a specific surface curvature that helps correct peripheral aberrations while maintaining the large aperture design. The inflection point allows the lens to better control light paths from the periphery, reducing aberration without reducing the aperture size.
3Area of stationary object
If a wide-angle lens is used to increase field of view, then the area covered is improved, but the distortion increases
Solution Approach 1:
The patent segments the lens system into three elements that work together to manage distortion. The first lens provides wide-angle coverage, the second lens corrects distortion introduced by the wide field of view, and the third lens adjusts the focal length to optimize the balance between field of view and distortion control. This segmentation enables the system to achieve wide-angle capability while maintaining acceptable distortion levels.
Solution Approach 2:
The inflection point on the image-side surface of the third lens creates a localized geometric feature that specifically addresses distortion control in the wide-angle configuration. This local modification allows the lens to better manage light paths from extreme field angles, reducing distortion while maintaining the wide field of view.
4Volume of moving object
If the lens size is minimized for compact devices, then the volume is reduced, but the optical performance deteriorates
Solution Approach 1:
The three-piece lens structure achieves compact miniaturization by distributing optical functions across multiple small elements rather than requiring a single large lens. Each lens element can be optimized for compact dimensions while collectively providing the required optical performance. The segmented approach allows for better control of light paths within a limited space, maintaining optical quality in a miniaturized configuration.
Solution Approach 2:
The patent introduces an inflection point on the image-side surface of the third lens, which changes the surface geometry to optimize optical performance within a compact design. This parameter modification allows the lens to achieve better aberration correction and image quality in a miniaturized structure, as the inflection point creates more effective light path control within the reduced space.
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 enhances light intake, corrects aberrations, and improves image quality across the field of view, achieving high-resolution imaging with reduced size and complexity, suitable for minimized electronic devices.
Implementation Method 1
an optical image capturing system includes a first lens, a second lens, and a third lens from an object side to an image side
Data Source
AI summary
The invention discloses a three-piece optical lens for capturing image and a three-piece optical module for capturing image, which include, along the optical axis in order from an object side to an image side, a first lens with positive refractive power having an object-side surface which can be convex; a second lens with refractive power; a third lens with refractive power; two surfaces of each of the three lenses can be both aspheric. The third lens can have positive refractive power, wherein an image-side surface thereof can be concave, and both surfaces thereof are aspheric; at least one surface of the third lens has an inflection point. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.