Six-Element Optical Lens Assembly for Stray Light Reduction
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Solution Overview
Problem
Conventional compact optical systems struggle to achieve high resolution and image quality due to limitations in refractive power arrangement, leading to issues like stray light generation and reduced back focal length.
Innovation Solution
The optical photographing lens assembly consists of six lens elements with refractive power, arranged from the object side to the image side, including a first lens element with positive refractive power and aspheric surfaces, and a sixth lens element with aspheric surfaces and a concave image-side surface, optimized with air spaces between elements to reduce stray light and enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional four-element or five-element lens structure is used, then the device complexity is reduced, but the image quality and resolution cannot satisfy high-end requirements
Solution Approach 1:
The optical system is divided into six distinct lens elements with specific refractive power distributions. Each lens element is designed with particular surface curvatures and aspheric coefficients to correct specific aberrations, allowing the system to achieve high image quality through segmented functional optimization rather than a single complex element
Solution Approach 2:
Different regions of the lens elements have different optical properties. The object-side and image-side surfaces of each lens element are designed with specific curvature radii and aspheric coefficients tailored to local requirements. For example, the first lens element has a convex object-side surface to collect light, while the sixth lens element has a concave image-side surface to control wavefront, with each surface optimized for its specific function in the optical path
2Object-affected harmful factors
If the refractive power arrangement is conventional, then the back focal length is maintained, but stray light is easily generated and small field of view cannot be achieved
Solution Approach 1:
The refractive powers of the six lens elements are specifically designed with particular curvature radii and aspheric coefficients to change the light path parameters. The object-side surface of the first lens element and the concave image-side surface of the sixth lens element work together to redirect light rays, reducing the back focal length while the aspheric surfaces control ray angles to minimize stray light generation
3Object-affected harmful factors
If the fifth lens element has a conventional shape, then manufacturing is simpler, but stray light cannot be reduced and image quality is compromised
Solution Approach 1:
The fifth lens element employs aspheric surfaces with specifically designed curvature coefficients to control light paths and reduce stray light. The aspheric profiles allow precise control of ray angles and wavefront shapes, eliminating spherical aberration and reducing off-axis light leakage that would otherwise require complex mechanical shading structures
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 solution effectively shifts refractive powers towards the object side, reducing back focal length and stray light, while improving image quality and resolution, thus addressing the limitations of conventional compact optical systems.
Implementation Method 1
an optical photographing lens assembly, in order from an object side to an image side, includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element
Implementation Method 2
both an object-side surface and an image-side surface of the sixth lens element are aspheric
Data Source
AI summary
An optical photographing lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has refractive power. The third lens element has refractive power. The fourth lens element has refractive power. The fifth lens element with refractive power has an image-side surface being convex in a paraxial region thereof, wherein an object-side surface and the image-side surface of the fifth lens element are both aspheric. The sixth lens element with refractive power has an object-side surface and an image-side surface being both aspheric. The optical photographing lens assembly has a total of six lens elements with refractive power.