Five-Element Telephoto Lens System Miniaturization
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Solution Overview
Problem
Conventional photographing lens systems struggle to achieve a balance between high specification and miniaturization, particularly in meeting the requirements for large apertures, telephoto features, and compact size, while also facing challenges with optical zoom and image quality.
Innovation Solution
A photographing optical lens system comprising five lens elements, each with specific refractive powers and surface curvatures, is designed to address the miniaturization and performance challenges. The system includes a first lens element with positive refractive power, a second lens element with negative refractive power, and a fifth lens element with negative refractive power, along with specific curvature radii and axial distances to optimize image quality and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photographing lens systems are designed with telephoto features and large apertures, then optical performance is improved, but total track length increases and device size becomes larger
Solution Approach 1:
The lens system is divided into five distinct lens elements with specific positive and negative refractive powers, allowing complex optical functions to be distributed across multiple components. This segmentation enables achieving telephoto optical performance while keeping each individual element compact, thereby reducing the total track length compared to conventional single-element or fewer-element designs.
Solution Approach 2:
The five lens elements are arranged in a nested configuration where elements with negative refractive power are positioned between elements with positive refractive power. This nesting strategy allows the optical path to be folded back on itself, effectively reducing the axial length (total track length) while maintaining the telephoto focal length and large aperture characteristics.
2Length of stationary object
If photographing lens systems are miniaturized to reduce device size, then device compactness is improved, but achieving large apertures and telephoto features becomes difficult
Solution Approach 1:
The patent employs specific parameter relationships between the five lens elements, including precise control of curvature radii (R1-R10), axial distances (Td, BL, Dr7r10), and refractive powers. By optimizing these parameters, the system achieves a compact form factor while maintaining telephoto optical characteristics and large aperture capability, effectively decoupling device size from optical zoom performance.
3Reliability
If more lens elements are added to improve image quality and optical performance, then image quality is improved, but device complexity and size increase
Solution Approach 1:
Each of the five lens elements is designed with specific local optical properties, including designated convex and concave surfaces with particular curvature radii. The first, third, and fifth elements have positive refractive power with specific surface configurations, while the second and fourth elements have negative refractive power. This localized optimization of quality in each element contributes to overall superior image quality while maintaining manageable system complexity through clear functional differentiation.
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 proposed lens system achieves improved image quality, miniaturization, and flexibility in design, enabling it to meet the demands for high specification and compact size while maintaining effective optical performance.
Implementation Method 1
The first lens element has positive refractive power, and the object-side surface of the first lens element is convex in a paraxial region thereof. The image-side surface of the first lens element is convex in a paraxial region thereof
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
A photographing optical lens system includes five lens elements being, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. Each lens element has an object-side surface facing the object side and an image-side surface facing the image side. The first lens element has positive refractive power and the object-side surface being convex in a paraxial region thereof. The image-side surface of the third lens element is convex in a paraxial region thereof. The object-side surface of the fourth lens element is convex in a paraxial region thereof. The fifth lens element has negative refractive power, the object-side surface being convex, and the image-side surface being concave in a paraxial region thereof.