Four-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 compact size.
Innovation Solution
A compact optical image capturing system using a combination of refractive powers and aspheric surfaces in four-piece optical lenses to increase light intake and improve imaging quality, with specific lens parameters and configurations that include inflection points on the fourth lens to adjust incident angles and modify aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture is increased to take pictures in dark environment, then the quantity of light entering the lens is increased, but the aberration becomes larger and image quality deteriorates
Solution Approach 1:
The optical system is divided into multiple lens elements (first, second, third, and fourth lens elements) with different refractive powers and surface configurations. Each lens element contributes to correcting aberrations while the overall system maintains a large aperture for sufficient light intake in dark environments.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements, including the fourth lens element which has an inflection point on its image-side surface. This curvature variation allows precise control of light paths to reduce aberration while maintaining large aperture for adequate illumination.
2Illumination intensity
If the aperture is increased to improve light intake, then more light enters the lens, but the system becomes harder to manufacture
Solution Approach 1:
The complex optical system is segmented into four distinct lens elements that can be manufactured and assembled separately. This segmentation makes the manufacturing process more manageable compared to creating a single complex lens with large aperture.
Solution Approach 2:
The patent specifies particular parameter ranges for each lens element, such as the inflection point position on the fourth lens element (0.05 < |HIF421|/HOI < 0.40), which optimizes the balance between optical performance and manufacturability.
3Adaptability or versatility
If the lens system is designed for wide-angle to increase field of view, then the angle of view is enlarged, but the distortion becomes larger
Solution Approach 1:
The wide-angle field of view is achieved through a segmented lens system where each element contributes to the overall angular coverage while individual elements correct for distortion, enabling wide-angle performance with controlled distortion.
Solution Approach 2:
Aspheric surfaces with inflection points on multiple lens elements, particularly the fourth lens element, provide precise control over ray paths across the wide field of view, correcting distortion while maintaining the enlarged angular coverage.
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 by optimizing lens parameters and surface shapes, addressing the limitations of conventional systems.
Implementation Method 1
The first lens element has positive refractive power
Implementation Method 2
both the object-side surface and the image-side surface of the fourth lens element are aspheric surfaces
Data Source
AI summary
The invention discloses a four-piece optical lens for capturing image and a four-piece optical module for capturing image. In order from an object side to an image side, the optical lens along the optical axis comprises a first lens with positive refractive power; a second lens with refractive power; a third lens with refractive power; and a fourth lens with refractive power; and wherein at least one of the image-side surface and object-side surface of each of the four lens elements is aspheric whereby the optical lens can increase aperture value and improve the imagining quality for use in compact cameras.