Five-Lens Optical System with Aspheric Inflection Points
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Solution Overview
Problem
Conventional optical systems in portable electronic devices face challenges in capturing high-quality images in low-light environments due to limited light intake and aberrations, particularly in compact designs with fewer lenses.
Innovation Solution
A compact optical image capturing system utilizing a combination of five-piece optical lenses with refractive powers, aspheric surfaces, and inflection points to optimize light entry and correct aberrations, including the use of convex and concave surfaces to adjust incident angles and modify optical paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the number of lenses is reduced to achieve compact size, then device complexity and size are improved, but light intake and image quality deteriorate
Solution Approach 1:
The patent employs aspheric surfaces on multiple lenses (first, third, and fifth lenses have aspheric object-side surfaces; fourth lens has aspheric image-side surface) to optimize light gathering and focusing capabilities. The aspheric shapes enable better control of light rays compared to traditional spherical surfaces, improving light intake efficiency without requiring additional lenses, thus resolving the contradiction between compact size and light intake capability
Solution Approach 2:
The patent utilizes inflection points on the aspheric surfaces of lenses (specifically on first, third, and fifth lenses) to modify optical paths and correct aberrations. By carefully designing the curvature parameters and inflection point positions, the system achieves improved light gathering and image quality within a compact five-lens configuration, addressing the limitation of reduced lens count
2Device complexity
If the number of lenses is reduced to achieve compact size, then device complexity is improved, but imaging quality deteriorates
Solution Approach 1:
The patent uses aspheric surfaces on the first, third, and fifth lenses (object-side) and fourth lens (image-side) to correct optical aberrations such as spherical aberration and coma. These aspheric shapes provide superior aberration correction compared to spherical surfaces, enabling high imaging quality to be achieved with only five lenses, thus resolving the contradiction between device complexity and imaging quality
Solution Approach 2:
The patent incorporates inflection points on the aspheric surfaces of multiple lenses to precisely control light ray paths and correct various optical aberrations. By optimizing the positions and curvatures of these inflection points, the system achieves high imaging quality with a simplified five-lens design, addressing the challenge of maintaining precision with reduced complexity
3Illumination intensity
If aperture is increased to improve light intake, then illumination intensity is improved, but aberrations increase
Solution Approach 1:
The patent employs aspheric surfaces on multiple lenses to correct spherical aberration and other optical defects that become more pronounced with larger apertures. The aspheric shapes enable better control of marginal rays, allowing the system to maintain high light intake capability while effectively correcting aberrations, thus resolving the contradiction between light intake and aberration control
Solution Approach 2:
The patent uses inflection points on the aspheric surfaces of lenses to optimize the optical paths of light rays passing through different zones of the aperture. By carefully positioning these inflection points, the system achieves effective aberration correction across the entire aperture, enabling large aperture operation with minimal aberrations and maintaining high imaging quality
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 and image quality while maintaining a compact size, effectively reducing aberrations and improving imaging performance in low-light conditions.
Implementation Method 1
a first lens, a second lens, a third lens, a fourth lens, and a fifth lens from an object side to an image side along an optical axis
Data Source
AI summary
An optical image capturing system includes, along the optical axis in order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. At least one lens among the first to the fifth lenses has positive refractive force. The fifth lens can have negative refractive force, wherein both surfaces thereof are aspheric, and at least one surface thereof has an inflection point. The lenses in the optical image capturing system which have refractive power include the first to the fifth lenses. The optical image capturing system can increase aperture value and improve the imagining quality for use in compact cameras.