Five-Lens Optical Assembly for Ultra-Wide FOV and Large Aperture
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Solution Overview
Problem
Existing camera lenses for electronic products face challenges in achieving both an ultra-wide field of view and large aperture while maintaining high image quality, especially when applied in 3D sensing technology.
Innovation Solution
An optical lens assembly comprising five lenses with specific refractive powers and surface configurations, including aspheric surfaces, optimized to satisfy conditions such as 0.58<FOV/(Fno*100)<1.28 and 4.76<(TL−BFL)/EPD<12.03, which allows for optimal aperture size and field of view settings, enhancing image quality and reducing aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the field of view is increased to achieve ultra-wide angle, then the field of view parameter is improved, but the aperture size and image quality deteriorate
Solution Approach 1:
The optical lens assembly is divided into five separate lens elements with different refractive powers and surface configurations. This segmentation allows each lens to contribute specifically to correcting aberrations while maintaining ultra-wide field of view and large aperture, resolving the contradiction between FOV and image quality
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements (second lens, third lens, fourth lens, and fifth lens) to correct spherical aberration and other optical distortions. The aspheric configurations enable the system to maintain high image quality across the ultra-wide field of view while preserving large aperture, directly addressing the contradiction
2Illumination intensity
If the aperture is increased to improve illuminance, then the aperture size is improved, but the field of view and aberration control worsen
Solution Approach 1:
Different regions of the optical system are assigned different properties: the first lens provides negative refractive power for wide angle, while subsequent lenses provide positive refractive power with aspheric surfaces for aberration correction. This local differentiation allows large aperture for illuminance while maintaining ultra-wide FOV and image quality
3Manufacturing precision
If complex lens configurations are used to improve image quality, then image quality is improved, but manufacturing complexity and tolerances worsen
Solution Approach 1:
The patent specifies precise parameter ranges for lens configurations (e.g., 0.58<FOV/(Fno×100)<1.28, 4.76<(TL−BFL)/EPD<12.03, and focal length ratios) that balance optical performance with manufacturability. These parameter optimizations enable high image quality while maintaining reasonable manufacturing tolerances and ease of production
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 optical lens assembly achieves optimized image quality, wide-angle characteristics, and suitable lens formability, maintaining high illuminance and reducing manufacturing tolerances, while providing a larger field of view and appropriate refractive power distribution.
Implementation Method 1
a first lens with negative refractive power, including an object-side surface and an image-side surface, the object-side surface of the first lens being convex in a paraxial region thereof, and the image-side surface of the first lens being concave in a paraxial region thereof; a second lens with positive refractive power
Implementation Method 2
one of the object-side surface and the image-side surface of the second lens being aspheric; a third lens with positive refractive power, including an object-side surface and an image-side surface, the object-side surface of the third lens being convex in a paraxial region thereof, the image-side surface of the third lens being convex in a paraxial region thereof, and one of the object-side surface and the image-side surface of the third lens being aspheric
Implementation Method 3
an IR band-pass filter
Data Source
AI summary
An optical lens assembly includes, in order from the object side to the image side: a first lens with negative refractive power, a second lens with positive refractive power, a stop, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, and an IR band-pass filter. A maximum field of view of the optical lens assembly is FOV, a f-number of the optical lens assembly is Fno, a distance from an object-side surface of the first lens to an image plane along an optical axis is TL, a distance from an image-side surface of the fifth lens to the image plane along the optical axis is BFL, an entrance pupil diameter of the optical lens assembly is EPD, and the following conditions are satisfied: 0.58<FOV/(Fno*100)<1.28 and 4.76<(TL−BFL)/EPD<12.03.