Five-Lens Optical System with Inflection Points for 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 difficulty in manufacturing due to the need for large apertures, while also requiring high pixels, high image quality, and a wide angle of view.
Innovation Solution
A compact optical image capturing system using a combination of five-piece optical lenses with specific refractive powers and aspheric surfaces to adjust the incident angle and modify aberrations, including inflection points on the fifth lens to improve light entry and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture is increased to capture more light for dark environment photography, then the light gathering capability is improved, but the aberration increases and image quality at periphery deteriorates
Solution Approach 1:
The optical system is divided into five separate lens elements with alternating positive and negative refractive powers. This segmentation allows each lens to contribute differently to light gathering and aberration correction, enabling the system to maintain large aperture while controlling peripheral image quality through the combined effect of multiple elements.
Solution Approach 2:
Different regions of the optical system are assigned different functions: the first positive lens and third positive lens are optimized for light gathering with larger curvatures, while the second negative lens and fourth negative lens are optimized for aberration correction. The fifth positive lens with inflection point specifically addresses peripheral image quality. This local optimization of each lens element's properties resolves the contradiction between aperture size and image quality.
2Illumination intensity
If the aperture is increased to capture more light, then the light gathering capability is improved, but the system becomes harder to manufacture
Solution Approach 1:
By segmenting the optical system into five manageable lens elements rather than one large aperture element, each component can be manufactured with standard precision tolerances. The alternating positive-negative lens configuration allows for modular manufacturing and assembly, reducing overall manufacturing difficulty compared to a single large aperture lens.
Solution Approach 2:
The patent specifies particular parameter ranges for each lens element (refractive powers, curvature radii, thickness ratios) that balance optical performance with manufacturability. These parameter constraints guide manufacturing processes to achieve the required precision without excessive difficulty, particularly for the inflection point design in the fifth lens.
3Adaptability or versatility
If a wide angle of view is implemented, then the field of view is improved, but the distortion increases
Solution Approach 1:
The five-lens segmented structure allows different elements to handle different aspects of wide-angle imaging. The positive lenses contribute to the wide field of view while the negative lenses correct the inherent distortion of wide-angle designs. This segmentation enables the system to achieve wide angle of view with controlled distortion through coordinated action of all elements.
Solution Approach 2:
Specific lens elements are optimized for different functions: the first and third positive lenses are designed with larger curvature radii to enable wide angle of view, while the second and fourth negative lenses are optimized for distortion correction. The fifth positive lens with inflection point provides additional correction for off-axis rays. This local functional assignment resolves the contradiction between wide angle and distortion.
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 entry and image quality, reduces aberrations, and achieves compact size, suitable for high-resolution imaging in portable devices.
Implementation Method 1
Optical image capturing system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens along an optical axis from an object side to an image side, each having refractive power
Data Source
AI summary
A five-piece optical lens for capturing image and a five-piece optical module for capturing image, along the optical axis in order from an object side to an image side, include 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; a fourth lens with refractive power; and a fifth lens which can have negative refractive power, wherein an image-side surface thereof can be concave, and at least one surface of the fifth lens has an inflection point; both surfaces of each of the five lenses are aspheric. The optical lens can increase aperture value and improve the imaging quality for use in compact cameras.