Wide-angle Image Lens Compact Length High Resolution
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Solution Overview
Problem
Existing image lenses fail to achieve a balance between high resolution and short overall length, resulting in either high resolution images from large lenses or lower resolution images from small lenses, which is not suitable for modern image sensors.
Innovation Solution
A wide-angle image lens design comprising multiple lenses with specific refractive powers, an IR-cut filter, and an aperture stop, optimized by a set of formulas to minimize aberrations and maintain image quality, including aspherical surfaces shaped by a specific mathematical formula to correct chromatic and spherical aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the image lens is made large to achieve high resolution, then the resolution is improved, but the overall length increases
Solution Approach 1:
The image lens is divided into multiple lens elements (first lens L1, second lens L2, third lens L3, fourth lens L4) with different refractive powers arranged in sequence. This segmentation allows each element to contribute differently to the overall optical function, enabling high resolution while maintaining a compact overall length through optimized distribution of optical power across multiple smaller components rather than one large element.
Solution Approach 2:
The patent employs aspherical surfaces with specific mathematical formulations and varying refractive indices across different lens elements. By changing the geometric parameters (aspherical coefficients) and optical parameters (refractive index distribution) of each lens element, the system achieves high resolution imaging while controlling the overall length to be shorter than conventional single-element or simple multi-element lenses.
2Length of stationary object
If the overall length is reduced to make the lens compact, then the overall length is improved, but the resolution deteriorates
Solution Approach 1:
By segmenting the optical system into four distinct lens elements with alternating positive and negative refractive powers, the patent achieves compact overall length while maintaining high resolution. Each segment is optimized to contribute specific optical functions, allowing the system to fit in a shorter space without sacrificing imaging quality.
Solution Approach 2:
The patent utilizes aspherical surfaces with precisely controlled curvatures in each lens element. The aspherical shapes allow for better control of light rays across the aperture, enabling high resolution imaging in a compact form factor by reducing the need for large physical dimensions that would be required with simple spherical surfaces.
3Measurement precision
If multiple lenses are added to improve resolution and control aberrations, then the image quality is improved, but the device complexity increases
Solution Approach 1:
The patent divides the optical system into four lens elements with a systematic arrangement (positive, positive, negative, positive refractive powers). This structured segmentation provides effective aberration control and high image quality while keeping the complexity manageable through a regular, repeating pattern rather than an irregular complex arrangement.
Solution Approach 2:
Each lens element is designed with specific local optical properties (different refractive powers, aspherical coefficients, and material characteristics) tailored to its position in the sequence. This local optimization allows each element to address specific aberration types or imaging requirements, achieving high overall image quality without requiring excessive complexity in the entire system.
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 design achieves high resolution images with a short overall length, effectively correcting spherical aberration, field curvature, and chromatic aberration while maintaining uniform light transmission, ensuring high image quality across the image plane.
Implementation Method 1
a first lens L1 with positive refraction power
Implementation Method 2
a second lens L2 with positive refraction power
Implementation Method 3
a third lens L3 with negative refraction power
Implementation Method 4
a fourth lens L4 with positive refraction power
Implementation Method 5
an IR-cut filter 40
Data Source
AI summary
A wide-angle image lens, in the order from the object side to the image side thereof, includes a first lens, a second lens, a third lens, a fourth lens and an image plane. The image lens satisfies the following formulas: D/TTL>0.45; CT4/ET4<2.11; Z/Y>0.06; wherein D is the maximum image diameter of the image plane; TTL is a total length of the wide-angle image lens; CT4 is a distance along an optical axis from the seventh surface to the eighth surface; ET4 is a distance along the optical axis from an outmost edge of the seventh surface to an outmost edge of the eighth surface; Z is a distance from a central point of the fifth surface to an outmost edge of the sixth surface along the optical axis; Y is a distance from the outmost edge of the sixth surface to the optical axis.