Five-Element Optical Lens Assembly for Compact Telephoto Imaging
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Solution Overview
Problem
Conventional optical systems struggle to balance high image quality, low sensitivity, proper aperture size, miniaturization, and field of view, especially in compact electronic devices with telephoto functions, due to the challenges of scaling down pixel size and increasing optical zoom requirements.
Innovation Solution
A photographing optical lens assembly comprising five lens elements with specific refractive power configurations and Abbe number relationships, along with optional reflective elements and aspheric surfaces, to achieve compactness and high image quality, including conditions such as 30<V2+V3+V4<93 and 0.5<ΣCT/ΣAT<2.5, which balance lens thickness and interval, and 0.1<TD/BL<1.1 for telephoto function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional telephoto lens design is used to increase optical zoom magnification, then telephoto function is improved, but total length becomes excessively long and compactness deteriorates
Solution Approach 1:
The patent employs a nested lens structure where multiple lens elements are arranged in a compact sequence with specific spacing relationships. The lens elements are positioned such that their optical paths are nested within a constrained axial space, enabling high magnification without proportional increase in total length. This is achieved through the specific arrangement where the distance between adjacent lens elements is optimized to create a compact telephoto configuration.
Solution Approach 2:
The patent transitions from conventional linear lens arrangements to a multi-dimensional optical path configuration. By introducing specific spacing relationships and positioning lens elements at optimized axial distances, the design creates a compact form factor that achieves telephoto function without extending the total length proportionally. The dimensional optimization of lens element positions enables high magnification within a constrained space.
2Measurement precision
If pixel size is scaled down to improve image sensor performance, then image quality is improved, but sensitivity deteriorates and aperture size requirements increase
Solution Approach 1:
The patent optimizes multiple optical parameters simultaneously including refractive indices, curvature radii, and axial distances between lens elements. By carefully selecting and adjusting these parameters, the system achieves high image quality with small pixel sizes while maintaining adequate sensitivity. The specific parameter relationships defined in the claims (such as spacing ratios and focal length relationships) enable this balanced performance.
Solution Approach 2:
The patent uses a composite lens system with multiple lens elements having different refractive indices and optical properties. This composite structure allows the system to achieve high resolution for small pixel sizes while the combined optical power of multiple elements maintains sufficient light gathering ability for sensitivity. Each lens element contributes specific optical characteristics that collectively resolve the sensitivity-quality trade-off.
3Use of energy by moving object
If aperture size is increased to improve light gathering ability, then sensitivity is improved, but device size and complexity increase
Solution Approach 1:
The patent designs the lens elements to serve multiple functions simultaneously. Each lens element not only contributes to the overall focal power but also acts as an aperture-controlling element and aberration corrector. This multi-functionality allows the system to achieve adequate light gathering ability without requiring a large dedicated aperture, thereby reducing device complexity and size.
Solution Approach 2:
The patent optimizes the aperture parameters in relation to other optical parameters such as focal length, lens spacing, and curvature radii. By coordinating these parameter changes, the system achieves efficient light gathering with a compact aperture design that does not increase device complexity proportionally.
4Device complexity
If lens elements are reduced in number to simplify structure, then device complexity is reduced, but image quality and aberration correction deteriorate
Solution Approach 1:
The patent applies local quality optimization where each lens element is specifically designed with tailored refractive index, curvature radii, and thickness to address particular aberration types. This localized optimization of each element's properties enables effective aberration correction and high image quality with a moderate number of elements, avoiding the need for excessive lens elements while maintaining performance.
Solution Approach 2:
The patent carefully selects and optimizes the parameters of each lens element including refractive index, dispersion characteristics, curvature radii, and axial positions. These parameter changes enable a compact number of lens elements to achieve superior image quality and aberration correction that would otherwise require more elements.
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 enables a compact optical lens assembly that maintains high image quality, supports telephoto functions, and corrects aberrations, while allowing for miniaturization and flexibility in design, suitable for various electronic devices.
Implementation Method 1
The first lens element has positive refractive power. The second lens element has negative refractive power.
Data Source
AI summary
A photographing optical lens assembly includes five lens elements which are, 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. The first lens element has positive refractive power. The second lens element has negative refractive power. When specific conditions are satisfied, the requirements of compact size and high image quality can be met by the photographing optical lens assembly, simultaneously.