Three-Aspheric Lens Optical System for Compact Imaging
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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 utilizing a combination of refractive powers and aspheric surfaces in three-piece lenses, including inflection points on the third lens to adjust incident angles and modify aberrations, improving imaging quality and light entry while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large aperture is used to increase light entry, then the quantity of light entering the lens is improved, but aberration increases and image quality at periphery deteriorates
Solution Approach 1:
The patent employs aspheric surfaces on multiple lens elements (first, second, and third lenses all have aspheric object-side or image-side surfaces) to replace traditional spherical surfaces. This curvature modification enables better control of light rays across the entire field of view, reducing spherical aberration and coma while maintaining large aperture capability for increased light entry.
Solution Approach 2:
The patent applies different surface types (aspheric vs. spherical) to different lens elements based on their specific functional requirements. For example, the first lens has an aspheric object-side surface to control incoming light, while the second lens has an aspheric image-side surface to correct aberrations before light reaches the sensor. This localized optimization allows each lens element to address specific aberration types while collectively improving overall image quality.
2Adaptability or versatility
If a wide-angle lens is used to increase field of view, then the angle of field is improved, but distortion increases
Solution Approach 1:
The patent uses aspheric surfaces on the first, second, and third lenses to control the angular distribution of light rays. The aspheric curvature profiles are specifically designed to maintain straight line rendering and geometric accuracy across a wide field of view (with half-field angle satisfying 20°≤2×HAF≤60°), correcting barrel or pincushion distortion that would otherwise occur in wide-angle designs.
3Manufacturing precision
If high pixel density is implemented to improve image quality, then imaging quality is improved, but manufacturing difficulty increases
Solution Approach 1:
The aspheric surfaces in the patent are designed to work with standard semiconductor manufacturing processes. By optimizing the aspheric coefficients and lens curvatures, the system achieves high imaging quality suitable for high-pixel sensors without requiring excessively tight tolerances that would make manufacturing prohibitively difficult. The three-piece lens structure with aspheric surfaces provides a balance between optical performance and manufacturability.
4Volume of moving object
If a compact size is achieved to minimize device dimensions, then device size is improved, but optical performance may deteriorate
Solution Approach 1:
The aspheric surfaces enable the patent to achieve high optical performance in a compact form factor. The optimized curvature profiles of the aspheric lenses allow for effective aberration correction with shorter focal lengths and reduced overall system length. The three-piece lens structure with aspheric surfaces provides sufficient degrees of freedom to control multiple aberration types while maintaining a compact total track length suitable for portable electronic devices.
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 pixel counts and compactness suitable for miniature electronic devices with improved manufacturing efficiency.
Implementation Method 1
Both the object-side surface and the image-side surface of the third lens are aspheric surfaces
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 imaging quality for use in compact cameras.