Five-Lens Optical System with Aspheric Surfaces for 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 difficulty in manufacturing due to the need for large apertures, while also requiring high pixels, high image quality, and compact size.
Innovation Solution
A compact optical image capturing system utilizing a combination of refractive powers and aspheric surfaces in a five-piece optical lens configuration to increase light intake and improve imaging quality, with specific lens parameters optimized for reduced size and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture is increased to capture more light in dark environments, then the light intake is improved, but the aberration increases and image quality at periphery deteriorates
Solution Approach 1:
The optical system is divided into five separate lens elements with alternating positive and negative refractive powers. This segmentation allows each lens to contribute differently to light gathering and aberration correction, enabling large aperture operation while maintaining image quality through coordinated action of multiple elements
Solution Approach 2:
Different regions of the optical system are assigned different functions: the first lens element with positive refractive power focuses on light gathering, while subsequent elements with negative refractive power specifically address aberration correction. The aspheric surfaces are strategically placed to correct local optical defects in different field regions
2Illumination intensity
If the aperture is increased to capture more light, then the light intake is improved, but the system becomes harder to manufacture
Solution Approach 1:
Aspheric surfaces are introduced on specific lens elements (object-side surface of first lens, image-side surface of second lens, and both surfaces of fifth lens). These curved surfaces enable precise control of light paths to correct aberrations while maintaining manufacturability through standardized aspheric fabrication processes
Solution Approach 2:
The refractive powers of lens elements are carefully selected within specific ranges (0.2<|f2/f1|<2.0, 0.3<|f3/f1|<2.0, 0.2<|f4/f1|<2.0) to balance optical performance and manufacturing feasibility. These parameter optimizations ensure that each lens element can be manufactured with standard tolerances while achieving the desired optical effects
3Volume of moving object
If the lens system is made compact to minimize electronic device size, then the device size is reduced, but the field of view and light intake are limited
Solution Approach 1:
The five lens elements are arranged in a compact nested configuration along the optical axis with minimized spacing. The alternating positive-negative refractive power arrangement allows for a more compact overall length while maintaining the optical path length necessary for light gathering and aberration correction
Solution Approach 2:
The optical design utilizes the radial dimension through aspheric surfaces to achieve aberration correction without increasing axial length. The aspheric profiles allow light rays from different angles to converge properly, effectively increasing the functional capability without expanding the physical footprint
4Volume of moving object
If the lens system is made compact to minimize electronic device size, then the device size is reduced, but the field of view is limited
Solution Approach 1:
The five-lens segmented configuration with alternating refractive powers enables wide field of view by distributing the angular acceptance across multiple elements. Each lens element contributes to capturing light from different field angles, and their coordinated action expands the overall field of view despite compact dimensions
Solution Approach 2:
The focal length ratios between lens elements are optimized within specific ranges to balance compact size and field of view. The negative refractive power elements (second, third, fourth lenses) are designed with focal lengths that expand the field of view while maintaining a compact overall system length
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, reduces size, and corrects aberrations, enabling high-quality image capture suitable for compact electronic devices.
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
Data Source
AI summary
A five-piece optical lens for capturing image and a five-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 having an object-side surface which can be convex; a second lens with refractive power; a third lens with refractive power; a fourth lens with refractive power; and a fifth lens which can have negative refractive power, wherein an image-side surface thereof can be concave, and at least one surface of the fifth lens has an inflection point; both surfaces of each of the five lenses are aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.