Four-Lens Optical System with Aspheric Surfaces for Compact Imaging
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Solution Overview
Problem
Conventional optical systems in portable electronic devices face challenges such as large aberration, poor image quality at the periphery, and manufacturing burdens due to large apertures, and they do not provide high optical performance, especially in low-light environments or wide-angle applications.
Innovation Solution
A compact optical image capturing system utilizing 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 the incident angle and modify aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large aperture is used to increase light intake, then the quantity of light entering the lens is improved, but aberration increases and image quality at periphery deteriorates
Solution Approach 1:
The optical system is divided into four separate lens elements (first lens with positive refractive power, second lens with negative refractive power, third lens with positive refractive power, and fourth lens with negative refractive power). Each lens element is designed with specific surface curvatures and refractive powers to collectively control light paths, reducing aberrations while maintaining large aperture for sufficient light intake.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements, including the object-side surface of the first lens, image-side surface of the second lens, object-side surface of the third lens, and both surfaces of the fourth lens. These aspheric surfaces with varying curvatures effectively correct spherical aberration and improve image quality at the periphery while maintaining a large aperture diameter.
2Length of moving object
If the optical system is made compact to minimize device size, then the size of electronic product is reduced, but optical performance may deteriorate
Solution Approach 1:
The four lens elements are arranged in a compact sequence along the optical axis with minimized spacing between them. The system structure nests the lenses closely together, reducing the overall length from the object-side surface of the first lens to the image plane, while maintaining effective optical performance through optimized refractive power distribution.
Solution Approach 2:
The patent optimizes key parameters including the focal length ratio (1.2≦f/HEP≦6.0), system height ratio (0.5≦HOS/f≦3.0), and lens spacing ratios to achieve a compact form factor. By carefully controlling these dimensionless parameters, the system achieves miniaturization without sacrificing optical quality.
3Ease of manufacture
If conventional two-piece lens design is used, then the device is simple to manufacture, but imaging quality in dark environment and wide-angle performance are insufficient
Solution Approach 1:
The optical system transitions from a conventional two-piece lens design to a four-piece lens configuration. This segmentation into more elements allows for better control of light paths, improved correction of aberrations, and enhanced imaging quality in challenging conditions such as low-light environments and wide-angle applications.
Solution Approach 2:
The patent employs a composite lens system with alternating positive and negative refractive power elements made from materials with different Abbe numbers. This composite structure enables effective chromatic aberration correction and improved overall imaging performance while remaining manufacturable using standard optical materials and processes.
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 enhanced imaging quality, reduced size, and improved optical performance by optimizing lens parameters and surface shapes, enabling high-pixel, high-quality image capture in compact electronic devices.
Implementation Method 1
a first lens, a second lens, a third lens, and a fourth lens, in order along an optical axis from an object side to an image side. The first lens has positive refractive power... Both the object-side surface and the image-side surface of the fourth lens are aspheric surfaces
Implementation Method 2
The present invention provides an optical image capturing system, in which the fourth lens is provided with an inflection point at the object-side surface or at the image-side surface to adjust the incident angle of each view field and modify the ODT and the TDT
Data Source
AI summary
A four piece optical lens for capturing image and a five-piece optical module for capturing image, includes 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, in order from an object side to an image side, the optical lens along the optical axis. At least one of the image-side surface and object-side surface of each of the four lenses is aspheric. The optical lens can increase aperture value and improve the imaging quality for use in compact cameras.