Five Element Optical Imaging Lens Compact Design
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Solution Overview
Problem
Existing optical imaging lenses with five lens elements fail to achieve both reduced length and good optical characteristics, as previous configurations either do not shorten the lens length sufficiently or compromise imaging quality.
Innovation Solution
An optical imaging lens configuration with five lens elements, where the refracting powers and surface shapes of the elements are carefully controlled, including positive and negative refracting powers, concave and convex surfaces, and specific air gaps, to satisfy equations that optimize the lens's focal length, thickness, and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the length of the optical imaging lens is reduced, then the size of the mobile device is decreased, but the optical characteristics deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refracting powers, curvatures, and thicknesses of all five lens elements. Specific parameters such as the refractive index, curvature radii, and axial thickness of each lens element are optimized to achieve both compact size and good optical performance. The patent also controls the air gaps between lens elements and the position of the aperture stop to fine-tune the optical characteristics while maintaining a short overall length.
2Length of moving object
If the configuration of lens elements is changed to shorten the lens length, then the size is reduced, but the imaging quality deteriorates
Solution Approach 1:
The patent applies local quality by giving each lens element specific local characteristics. The first lens element has a convex object-side surface with specific curvature, the second and third elements have negative refracting powers with particular surface configurations, and the fourth and fifth elements have specific image-side surface shapes. Each lens element's local optical properties are optimized to contribute to overall imaging quality while enabling compact design.
Solution Approach 2:
The patent uses composite optical design by combining five different lens elements with varying refractive indices and Abbe numbers. The first lens element has a refractive index of 1.5-1.8 and Abbe number of 25-50, the second has refractive index of 1.4-1.7 and Abbe number of 20-45, and so on. This composite structure allows correction of chromatic and spherical aberrations while maintaining short length.
3Reliability
If the refracting powers of lens elements are adjusted to improve optical characteristics, then the imaging quality is improved, but the lens length increases
Solution Approach 1:
The patent applies dynamics by making the aperture stop movable along the optical axis. The aperture stop can be positioned at different locations depending on the imaging conditions, allowing the system to optimize between compact size and optical performance dynamically. This dynamic adjustment enables good optical characteristics without requiring a fixed long lens structure.
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 optical imaging lens length while maintaining good optical characteristics, improving image quality and meeting modern design requirements for smaller form factors.
Implementation Method 1
an optical imaging lens having five lens elements... the first lens element has positive refracting power... the second lens element has negative refracting power... the third lens element has negative refracting power
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.