Three-Lens Optical System Aberration Control
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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 manufacturing difficulties due to the need for large apertures and wide-angle lenses, which also suffer from distortion and high pixel requirements.
Innovation Solution
A compact optical image capturing system using a combination of three-piece optical lenses with refractive powers, convex and concave surfaces, and inflection points to adjust incident angles and modify aberrations, improving light entry and image quality, while maintaining a small size and high pixel count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture is increased to allow more light entry, then the quantity of light entering the lens is improved, but the aberration increases and image quality at periphery deteriorates
Solution Approach 1:
The optical system is divided into three separate lens elements (first lens with positive refractive power, second lens with negative refractive power, and third lens with positive refractive power) instead of using a single lens. This segmentation allows each lens element to contribute differently to light gathering and aberration correction, enabling large aperture while maintaining image quality at periphery through coordinated optical power distribution.
Solution Approach 2:
Each lens element has specifically designed surface characteristics (convex or concave surfaces with inflection points) that create localized optical corrections. The second lens with negative power specifically addresses peripheral aberrations caused by the large aperture of the first lens, while the third lens fine-tunes the overall image quality. This local quality approach allows different regions of the optical system to address different aspects of the light gathering versus aberration trade-off.
2Area of moving object
If a wide-angle lens is used to increase the angle of field, then the angle of field is improved, but the distortion increases
Solution Approach 1:
The wide-angle field of view is achieved through the combined effect of three lens elements rather than a single wide-angle lens. The first lens with positive power provides the primary wide-angle capability, while the second lens with negative power and the third lens with positive power work together to correct the distortion that would otherwise result from the wide-angle design. This segmented approach enables large angle of field while maintaining shape accuracy.
Solution Approach 2:
The optical system uses specific parameter relationships between the three lenses (refractive powers, surface curvatures, and spacing) to balance wide-angle performance with distortion control. By carefully controlling the parameters of each lens element and their relative positions, the system achieves an angle of field of at least 60 degrees while keeping distortion below 20%, as the combined optical parameters compensate for the distortion inherent in wide-angle designs.
3Volume of moving object
If the system size is reduced for compactness, then the size is improved, but the ability to maintain high optical performance deteriorates
Solution Approach 1:
The three lens elements are arranged in a compact nested configuration along the optical axis, with each subsequent lens positioned close to the previous one. This nesting approach minimizes the overall axial length of the optical system while maintaining the necessary spacing between elements for optical functionality. The compact arrangement achieves a total track length that is compact yet preserves the optical performance required for high pixel count sensors.
Solution Approach 2:
The system maintains high optical performance in a compact form by optimizing the parameters of each lens element (refractive indices, surface curvatures, thicknesses) and their spacing. The specific parameter relationships enable the three-lens system to achieve diffraction-limited performance and correct aberrations within a shortened optical path, making it suitable for miniaturized electronic devices with high pixel count sensors.
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 image quality, reduces aberrations, and increases light entry, achieving high optical performance and compactness suitable for miniature electronic devices with high pixel counts.
Implementation Method 1
The first lens has positive refractive power
Implementation Method 2
The second lens has negative refractive power
Implementation Method 3
The third lens has positive refractive power
Data Source
AI summary
A three-piece optical lens for capturing image and a three-piece optical module for capturing image, along the optical axis in order from an object side to an image side, include a first lens with positive refractive power; a second lens with refractive power; and a third lens with refractive power; and at least one of the image-side surface and object-side surface of each of the three lens elements are aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.