Five-Lens Optical System with Aspheric Inflection Points
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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 increase light intake and improve imaging quality, including a fifth lens with inflection points to adjust incident angles and modify aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large aperture is used to increase light intake for dark environment photography, then the quantity of light entering the lens is improved, but aberration increases and image quality at the periphery deteriorates
Solution Approach 1:
The optical system is divided into five separate lens elements instead of using a single large aperture lens. Each lens element contributes to the overall light gathering capability while maintaining control over aberrations through individual optimization of each element's refractive power and surface geometry.
Solution Approach 2:
Aspheric surfaces are employed on one or more lens elements to replace traditional spherical surfaces. This allows for better control of light rays across the entire field of view, reducing spherical aberration and improving peripheral image quality while maintaining the large aperture design.
2Manufacturing precision
If the number of lens elements is increased to improve imaging quality, then image quality is improved, but device complexity and size increase
Solution Approach 1:
Multiple lens elements are combined in a compact arrangement where the cumulative optical power of all five elements achieves the desired imaging quality. The design integrates the functions of multiple elements into a unified optical system with a total length that is minimized through optimized spacing and curvature.
Solution Approach 2:
The patent explores different structural configurations of the five-lens system, varying parameters such as the position of inflection points on lens surfaces and the distribution of refractive powers. These dimensional adjustments allow for optimization of both image quality and compactness without fundamentally changing the five-element architecture.
3Adaptability or versatility
If a wide angle of view is implemented to capture more scene, then the angle of field is improved, but distortion increases
Solution Approach 1:
Different regions of the optical system are optimized for different functions. The peripheral zones of the lens elements are specifically designed with aspheric profiles and appropriate curvatures to control off-axis light rays, thereby reducing distortion in the wide-angle field while maintaining sharp central imaging.
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 improved imaging quality, reduced size, and enhanced optical performance, supporting high-resolution image capture with reduced aberrations and increased light efficiency.
Implementation Method 1
a first lens, a second lens, a third lens, a fourth lens, and a fifth lens in order along an optical axis from an object side to an image side with refractive power
Implementation Method 2
Both the object-side surface and the image-side surface of the fifth lens are aspheric surfaces
Data Source
AI summary
The invention discloses a five-piece optical lens for capturing image. In order from an object side to an image side, the optical lens along the optical axis comprises a first lens which can have positive refractive power, and an object-side surface thereof can be convex; a second lens with refractive power; a third lens with refractive power; a fourth lens with refractive power, wherein both surfaces of each of the aforementioned lenses can be aspheric; and a fifth lens which can have negative refractive power, wherein an image-side surface thereof can be concave, and both surfaces thereof are aspheric; at least one surface of the fifth lens has an inflection point thereon. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.