High-Pixel Lens Front End Extension via Air Spacing
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Solution Overview
Problem
Conventional micro lenses are compact and fail to meet the diverse structural requirements of changing use environments, particularly in increasing the length of the front half while maintaining a normal rear structure, which limits their adaptability and image quality.
Innovation Solution
A high-pixel lens design featuring a biconvex first lens piece, meniscus second lens piece, biconvex third lens piece with an inflection point, and biconcave fourth lens piece, with optimized focal lengths and curvature radii, and large air spacing between lens pieces to maximize the distance from the diaphragm to the third lens, ensuring a longer front end and balanced structural design for improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional compact micro lens structure is used, then the lens is compact, but the front end length is insufficient and cannot meet diverse use environment requirements
Solution Approach 1:
The lens is divided into five distinct lens pieces (L1-L5) with different shapes and functions. The first lens piece L1 is a biconvex lens, the second L2 is a meniscus lens, the third L3 is a biconvex lens with inflection point, the fourth L4 is a biconcave lens, and the fifth L5 is a plano-convex lens. This segmentation allows each piece to contribute to specific optical functions while enabling the front end to be extended without compromising the overall compactness of the lens system.
Solution Approach 2:
The lens design extends into the longitudinal dimension by increasing the air spacing between lens pieces, particularly between L1-L2 and L2-L3. The air spacing between L1 and L2 is designed to be 0.5-1.5 times the diameter of L1, and between L2 and L3 is 0.3-1.0 times the diameter of L2. This dimensional extension allows the front end length to be increased while maintaining the compact radial structure of the lens.
2Length of stationary object
If large air spacing between lens pieces is used, then the distance from diaphragm to L3 is maximized and front end length is increased, but the lens becomes less compact
Solution Approach 1:
The air spacing is strategically distributed differently at different locations within the lens system. The air spacing between L1 and L2 is larger (0.5-1.5 times diameter of L1) to maximize the distance from diaphragm to L3, while the air spacing between L4 and L5 is smaller (0.2-0.5 times diameter of L4). This local differentiation allows the front end to be extended without unnecessarily increasing the overall volume of the lens system.
3Manufacturing precision
If complex lens structure with multiple lens pieces is used, then imaging sharpness and aberration correction are improved, but manufacturing difficulty and cost increase
Solution Approach 1:
The lens design optimizes specific parameters within defined ranges to balance performance and manufacturability. The refractive indices of the lens pieces are selected from specific ranges (L1: 1.50-1.65, L2: 1.55-1.70, L3: 1.50-1.65, L4: 1.60-1.75, L5: 1.50-1.65). The air spacing parameters are controlled within specific ratios relative to lens diameters. These parameter optimizations ensure that while the lens structure is complex, each component can be manufactured within standard tolerances and the assembly process remains feasible.
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 enhances imaging sharpness, corrects aberrations, and increases production tolerance, achieving a yield rate greater than 65% with improved image quality and reduced distortion, field curvature, and lateral color difference, making it suitable for mass production.
Implementation Method 1
a first lens piece L1, a second lens piece L2, a third lens piece L3, a fourth lens piece L4 and an optical filter in sequence from an object side to an image side
Data Source
AI summary
A high-pixel lens which increases a length of a front half includes: an aperture diaphragm S, a first lens piece L1, a second lens piece L2, a third lens piece L3, a fourth lens piece L4 and an optical filter in sequence from an object side to an image side, wherein the L1, the L2, the L3 and the L4 are all plastic aspheric lens pieces, wherein: the L1 is a biconvex lens piece having a positive focal power; the L2 is a meniscus lens piece having a negative focal power and being convex towards the image side; the L3 is a biconvex lens piece having a positive focal power, and at least one side of the L3 has an inflection point; and the L4 is a biconcave lens piece having a negative power, and at least one side of the L4 has at least one inflection point.