Aspherical Optical Lens Design for Large Aperture and Low Power
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Solution Overview
Problem
Achieving an optical lens with a large aperture value is challenging due to insufficient incident light, leading to slower reaction speeds and increased power consumption in infrared camera modules, particularly in smartphones and electronic devices used for 3D sensing applications.
Innovation Solution
The design of an optical lens comprising three aspherical lenses with specific focal lengths and structural parameters, including a convex and concave surface configuration, an aperture stop, and an infrared filter, which adjusts light quality and ensures a large aperture value (F-number) between 1.0 and 1.3, enhancing light transmission and imaging speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture value is increased to improve light transmission, then the incident light becomes sufficient and imaging speed improves, but the system power consumption increases
Solution Approach 1:
The patent optimizes the aperture value parameter to F-number between 1.0 and 1.3, which balances light transmission efficiency with power consumption. This specific parameter range allows sufficient incident light for fast imaging while avoiding excessive power consumption that would occur with larger aperture values
2Measurement precision
If multiple lenses are used to improve resolution, then the imaging quality improves, but the device complexity increases
Solution Approach 1:
The optical system is divided into three distinct aspherical lenses, each with specific focal lengths and surface configurations. This segmentation allows each lens to contribute to resolution improvement while maintaining individual lens simplicity, achieving high resolution without excessive overall complexity
Solution Approach 2:
All three lenses are designed as aspherical lenses with specific curvature parameters. The aspherical surfaces enable better light control and resolution improvement compared to spherical lenses, while the mathematical definition of aspherical surfaces allows for efficient manufacturing and integration
3Area of stationary object
If the field angle is widened to improve imaging coverage, then the disclosure scenarios are enriched, but the distortion increases
Solution Approach 1:
The patent optimizes the field angle parameter to between 70° and 72°, which provides wide imaging coverage for enriched disclosure scenarios while maintaining acceptable distortion levels. This parameter optimization is achieved through coordinated design of the three aspherical lenses with specific focal lengths and surface curvatures
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 improves imaging quality, increases relative illumination, reduces distortion, and minimizes power consumption by optimizing the optical system's parameters to achieve a wider field angle and higher resolution while maintaining a compact form factor.
Implementation Method 1
The optical lens with an optical axis O includes a first lens 110, a second lens 120, and a third lens 130 from the object side to the image side along the optical axis O
Implementation Method 2
at least part of an object surface F5 of the third lens 130 is a convex surface, while an image surface F6 of the third lens 130 is a concave surface
Data Source
AI summary
An optical lens includes a first lens, a second lens, and a third lens sequentially arranged along an optical axis from an object side to an image side. At least part of an object surface of the first lens is a convex surface, an image surface of the first lens is a convex surface. At least part of an object surface of the second lens is a concave surface, an image surface of the second lens is a convex surface. At least part of an object surface of the third lens is a convex surface, an image surface of the third lens is a concave surface. An aperture value of the optical lens satisfies a following condition: 1.0≤Fno≤1.3, wherein Fno represents the aperture value of the optical lens. An electronic device is provided.