Three-Piece Aspheric Lens System for Compact Camera Aperture
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Solution Overview
Problem
Conventional optical systems for portable electronic devices face challenges in achieving high imaging quality, large aperture, and wide-angle capabilities while minimizing size and aberrations, particularly in low-light environments.
Innovation Solution
The optical image capturing system employs a three-piece optical lens configuration with refractive powers, convex and concave surfaces, and inflection points to optimize light entry and image formation, incorporating aspheric surfaces and specific lens parameters to control aberrations and improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture is increased to improve light intake in low-light environments, then the quantity of light entering the lens is improved, but aberration increases and image quality at the periphery deteriorates
Solution Approach 1:
The optical system is divided into multiple 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.
Solution Approach 2:
Different regions of the optical system are given different properties: the first lens has a convex object-side surface to gather light, the second lens has concave surfaces to correct aberrations, and the third lens has specific curvature ratios to control peripheral image quality. This local optimization of optical properties allows simultaneous achievement of large aperture and high image quality.
2Illumination intensity
If the aperture is increased to improve light intake, then the quantity of light entering the lens is improved, but the system becomes harder to manufacture
Solution Approach 1:
The patent specifies precise parameter ranges for the lens system, including focal length ratios (0.3<|f2/f1|<1.5, 0.5<|f2/f3|<2.0), curvature ratios (0.2<|R21/R22|<2.0, 0.3<|R31/R32|<2.0), and focal length to entrance pupil diameter ratio (1.0<f/HEP<5.0). These controlled parameters make the complex multi-element system manufacturable by providing clear design guidelines.
3Adaptability or versatility
If wide-angle capability is increased to improve field of view, then the angle of field is improved, but distortion increases
Solution Approach 1:
The optical system uses multiple lens elements with different refractive powers arranged in sequence: the first lens (positive power) for light gathering, the second lens (negative power) for distortion correction, and the third lens (positive power) for focusing. This segmented approach enables wide-angle capability while controlling distortion through the complementary actions of different lens elements.
Solution Approach 2:
The lens elements have asymmetric surface curvatures with specific ratio constraints (0.2<|R21/R22|<2.0, 0.3<|R31/R32|<2.0). The object-side and image-side surfaces of each lens have different curvature characteristics, allowing the system to achieve wide field of view while correcting asymmetric distortion patterns typical of wide-angle lenses.
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
This configuration enhances light intake, reduces aberrations, and achieves high image quality with compact size, suitable for high-pixel imaging in portable devices, even in low-light conditions.
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, wherein an object-side surface thereof can be convex; a second lens with refractive power; and a third lens with refractive power, wherein both surfaces of each of the aforementioned lenses can be aspheric; the third lens can have positive refractive power, wherein an image-side surface thereof can be concave, and both surfaces thereof are aspheric; at least one surface of the third lens has an inflection point. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.