Six-Element Optical Imaging Lens Compact Design
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Solution Overview
Problem
Conventional optical imaging lenses with six elements are too long for smaller sized mobile devices, such as smartphones and digital cameras, while maintaining good optical characteristics is a challenge due to the limited length of conventional four-element lenses.
Innovation Solution
An optical imaging lens with six elements is designed, where the convex or concave shape of the surfaces is controlled to shorten the length while maintaining good optical characteristics, using specific equations to optimize the thickness and air gaps between the lens elements, such as T5/G45≦2 and ALT/EFL≦2.1, to achieve a shorter length without compromising imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lens elements is increased from four to six to improve imaging quality, then the imaging quality and pixel performance are improved, but the length of the optical imaging lens exceeds 21 mm making it too long for smaller sized mobile devices
Solution Approach 1:
The patent applies parameter changes by precisely controlling the convex or concave shape of lens surfaces, optimizing the central thickness of the fifth lens element (T5) relative to the air gap between the fourth and fifth lens elements (G45) with the ratio T5/G45 ≤ 2, and controlling the total air gap ratio ALT/EFL ≤ 2.1. These parameter optimizations enable the six-element lens to achieve excellent imaging quality while maintaining a compact length suitable for mobile devices
Solution Approach 2:
The patent utilizes aspherical surfaces on multiple lens elements (first, second, third, fourth, fifth, and sixth lens elements) to correct optical aberrations in a different dimensional approach. The aspherical coefficients and conic constants are specifically optimized to achieve superior imaging performance without increasing the axial length of the optical system
2Length of moving object
If the length of the optical imaging lens is reduced to fit smaller sized mobile devices, then the device size is reduced, but achieving good optical characteristics becomes a challenging problem
Solution Approach 1:
The patent employs parameter changes by establishing specific constraints on lens element thickness and air gap ratios. The key parameter T5/G45 ≤ 2 optimizes the compactness of the fifth lens element while maintaining optical performance. Additionally, the total air gap ratio ALT/EFL ≤ 2.1 ensures that the overall lens length is controlled while preserving the optical path length necessary for good imaging characteristics
Solution Approach 2:
The patent utilizes aspherical surfaces on all six lens elements to correct optical aberrations in a compact configuration. The aspherical coefficients and conic constants are specifically optimized to achieve superior imaging performance without requiring a longer focal length, thereby maintaining excellent optical characteristics in a shortened lens design
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 shortens the length of the optical imaging lens while maintaining excellent imaging quality and optical characteristics, suitable for smaller sized mobile devices, and allows for improved assembly and reduced production costs.
Implementation Method 1
each of the first, second, third, fourth, fifth and sixth lens elements having refracting power
Data Source
AI summary
Present embodiments provide for a mobile device and an optical imaging lens thereof. The optical imaging lens comprises an aperture stop and six lens elements positioned sequentially from an object side to an image side. Through controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least one inequality, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.