Seven-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 seven-piece optical lens configuration with refractive powers, convex and concave surfaces, and inflection points to optimize light entry and correct aberrations, including the use of aspheric surfaces and a seventh lens with specific refractive power and inflection points 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 the device size is minimized, but the light intake and image quality deteriorate
Solution Approach 1:
The patent employs aspheric surfaces on multiple lenses (first, third, fourth, fifth, sixth, and seventh lenses) with specific aspheric coefficients to optimize light gathering and focusing. The aspheric shapes enable better control of light paths with fewer lenses, maintaining compact size while improving light intake and image quality compared to conventional spherical lens designs.
2Volume of moving object
If the number of lenses is reduced to achieve compact size, then the device size is minimized, but the optical performance and image quality deteriorate
Solution Approach 1:
The patent assigns different refractive indices and aspheric coefficients to specific lenses and surfaces based on their local optical requirements. For example, the first lens has negative refractive power with specific aspheric surfaces to correct peripheral aberrations, while the seventh lens has positive refractive power to focus light. This localized optimization maintains high optical performance in a compact seven-lens configuration.
Solution Approach 2:
The patent utilizes precise control of optical parameters including refractive indices (ranging from 1.5 to 1.7), aspheric coefficients (A2, A4, A6, A8, A10), and surface curvatures to optimize performance. By carefully adjusting these parameters across the seven lenses, the system achieves high image quality with reduced aberrations while maintaining compact dimensions.
3Illumination intensity
If the aperture is increased to improve light intake, then the quantity of light entering the lens is increased, but the optical system size and complexity increase
Solution Approach 1:
The aspheric surfaces on all seven lenses enable the system to maintain a large effective aperture while controlling spherical aberrations and other optical imperfections. The specific aspheric coefficients allow the lenses to focus light from wide angles without requiring additional corrective elements, thus increasing light intake without proportionally increasing system complexity.
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 correcting aberrations and improving imaging performance across various wavelengths, including visible and infrared light.
Implementation Method 1
an optical image capturing system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, and an image plane, in order along an optical axis from an object side to an image side. The first lens has refractive power.
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, a fifth lens, a sixth lens, and a seventh lens. At least one lens among the first to the sixth lenses has positive refractive force. The seventh 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 seventh lenses. The optical image capturing system can increase aperture value and improve the imaging quality for use in compact cameras.