Six-Element Optical Imaging Lens Compact Design
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Solution Overview
Problem
Conventional optical imaging lenses with six lens elements face challenges in achieving both reduced size and high optical quality, particularly in meeting the demands of high-resolution devices like smartphones and digital cameras, where size reduction compromises optical characteristics.
Innovation Solution
The optical imaging lens is designed with specific convex and concave surface shapes for its lens elements, along with controlled refractive power and air gaps, to minimize length while maintaining high optical resolution and eliminating aberrations, adhering to specific equations for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the number of lens elements is reduced to six, then the total length of the optical imaging lens can be limited to a certain length range, but achieving good optical characteristics becomes challenging
Solution Approach 1:
The patent applies local quality by designing different surface shapes (convex or concave) for different regions of the lens elements. Specifically, the first lens element has a convex object-side surface, the second lens element has a concave image-side surface, the third lens element has a convex image-side surface, the fourth lens element has a convex object-side surface, the fifth lens element has a convex image-side surface, and the sixth lens element has a concave object-side surface. This localized optimization of surface geometry allows the six-lens-element structure to achieve both compact length and good optical characteristics.
2Length of moving object
If the optical imaging lens is shortened, then the size of the mobile device can be reduced, but optical quality and resolution may deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices and surface curvatures of the six lens elements. The specific refractive index ranges are: first lens element (1.5-1.7), second lens element (1.6-1.8), third lens element (1.5-1.7), fourth lens element (1.6-1.8), fifth lens element (1.5-1.7), and sixth lens element (1.6-1.8). These parameter optimizations enable the compact lens to maintain high optical resolution and quality despite the reduced length.
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 while preserving high optical quality, ensuring good resolution and reducing aberrations, thus addressing the size and quality demands of modern imaging devices.
Implementation Method 1
an optical imaging lens having six lens elements... each of the lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side
Data Source
AI summary
An optical imaging lens includes six lens elements. The object-side surface of the second lens element comprises a convex portion in a vicinity of a periphery, the third lens element has positive refractive power and the image-side surface comprises a convex portion in a vicinity of a periphery, the image-side surface of the fifth lens element comprises a convex portion in a vicinity of an optical axis, and the image-side surface of the sixth lens element comprises a concave portion in a vicinity of an optical axis and a convex portion in a vicinity of a periphery. The optical imaging lens as a whole has only the six lens elements. A distance from the object-side surface of the first lens element to the image-side surface of the sixth lens element is TL, a central thickness of the sixth lens element along the optical axis is CT6, and 7.6≤TL/CT6.