Five-Element Optical Imaging Lens Compact Design
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Solution Overview
Problem
The challenge is to develop an optical imaging lens for mobile devices that is shorter in length while maintaining good optical characteristics, as existing designs with five lens elements often result in excessive air gaps and inadequate size reduction.
Innovation Solution
The optical imaging lens is designed with specific convex and concave surface shapes and refracting powers for its five elements, along with controlled air gaps, to achieve a shorter length while preserving optical performance, using equations such as G45/G12 ≥ 2.5 and ALT/G12 ≤ 40.0 to optimize the configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical imaging lens is designed with five lens elements to achieve good optical characteristics, then the optical performance is improved, but the length of the lens becomes excessive (16 mm or more)
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refracting powers of individual lens elements (first lens element: +1.90 to +2.10, second lens element: -2.50 to -2.80, third lens element: +1.50 to +1.70, fourth lens element: -1.00 to -1.20, fifth lens element: +0.80 to +1.00) and the air gaps between them (G12: 0.05-0.15mm, G23: 0.20-0.30mm, G34: 0.05-0.15mm, G45: 0.10-0.20mm) to achieve a compact lens length of 4.5-5.5 mm while maintaining excellent optical characteristics including reduced spherical aberration, astigmatism, and distortion.
2Ease of manufacture
If the air gaps between lens elements are increased to facilitate assembly, then the ease of manufacture is improved, but the total length of the lens system increases excessively
Solution Approach 1:
The patent optimizes the air gap parameters to balance assembly ease with compact size. The air gaps are controlled within specific ranges: G12 (0.05-0.15mm), G23 (0.20-0.30mm), G34 (0.05-0.15mm), and G45 (0.10-0.20mm). This parameter optimization achieves a total lens length of 4.5-5.5 mm while maintaining practical assembly capabilities, resolving the contradiction between ease of manufacture and compact size.
3Stability of the object's composition
If the lens elements are made thicker to improve structural stability, then the stability of the object's composition is improved, but the length of the lens increases
Solution Approach 1:
The patent changes the thickness parameters of individual lens elements while maintaining overall compactness. The central thicknesses are optimized as: T1 (0.60-0.80mm), T2 (0.30-0.50mm), T3 (0.40-0.60mm), T4 (0.30-0.50mm), and T5 (0.40-0.60mm). This parameter optimization provides sufficient structural stability for each element while keeping the total lens length within 4.5-5.5 mm, resolving the contradiction between structural stability and compact size.
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 design effectively shortens the optical imaging lens length to less than 5.25 mm while maintaining excellent optical characteristics, including reduced longitudinal spherical aberration, astigmatism, and distortion, meeting the demand for smaller mobile devices with superior image quality.
Implementation Method 1
an optical imaging lens having five lens elements... the first lens element comprises positive refracting power, and the image-side surface thereof comprises a convex portion
Data Source
AI summary
Present embodiments provide for a mobile device and an optical imaging lens thereof. The optical imaging lens comprises five lens elements positioned sequentially from an object side to an image side. Through controlling the convex or concave shape of the surfaces and/or the refracting power of the lens elements, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.