Seven-Lens Photographic Objective for Compact Wide-Angle Imaging
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Solution Overview
Problem
Photographic objective lenses with large relative apertures face challenges in achieving a balance between field of view and physical volume, leading to high distortion and large size due to the semi-spherical imaging requirements.
Innovation Solution
A seven-lens configuration comprising meniscus and biconvex lenses with specific radii of curvature, refractive indices, and Abbe numbers, arranged coaxially to achieve a large relative aperture while minimizing volume, including a meniscus lens, biconcave lens, and biconvex lenses with precise curvature and thickness parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the field of view is increased to 180° with semi-spherical imaging, then the coverage area is improved, but the volume of the objective lens becomes large
Solution Approach 1:
The objective lens is divided into seven separate lens elements (first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, and seventh lens L7) arranged in sequence along the optical axis. This segmentation allows each lens to contribute specifically to correcting aberrations and achieving the 180° field of view while keeping the overall volume compact.
Solution Approach 2:
Each lens element is designed with specific local optical properties including different curvature radii (e.g., first curved surface: 200mm, second curved surface: 15mm, third curved surface: 16mm, fourth curved surface: 10mm, fifth curved surface: 17mm, sixth curved surface: 70mm, seventh curved surface: -190mm, eighth curved surface: 30mm, ninth curved surface: 22mm, tenth curved surface: -26mm, eleventh curved surface: -60mm, twelfth curved surface: -15mm, thirteenth curved surface: -10mm, fourteenth curved surface: -60mm), central thicknesses (ranging from 2mm to 5mm), and specific refractive index to Abbe number ratios. These localized optical characteristics enable precise control of light paths to achieve wide-angle imaging with compact dimensions.
2Illumination intensity
If the relative aperture is increased, then the light gathering ability is improved, but the distortion increases
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element including curvature radii (from 10mm to 200mm), central thicknesses (2mm to 5mm), and refractive index to Abbe number ratios (1.62/60, 1.64/35, 1.75/30). These parameter optimizations enable the lens to maintain low distortion while achieving large relative aperture by precisely controlling the refraction and convergence of light rays across the wide aperture.
Solution Approach 2:
The objective lens employs multiple lens elements made from different optical materials with distinct refractive indices and Abbe numbers. This composite structure allows each material to be optimized for specific wavelength ranges and aberration corrections, enabling the system to achieve large relative aperture with minimal distortion through the combined optical properties of all seven lens elements.
3Manufacturing precision
If the focal length is increased to achieve proper image diameter, then the image quality is improved, but the overall size of the lens becomes large
Solution Approach 1:
The patent achieves the required image diameter (2f) not by simply increasing the physical focal length in one dimension, but by using a complex seven-element lens system where the effective focal length is achieved through the combined optical power of multiple elements arranged along the optical axis. This allows the focal length function to be distributed across multiple compact components rather than requiring a single large element.
Solution Approach 2:
The seven lens elements are arranged in a nested configuration along the optical axis with specific intervals between them (first interval: 30mm, second interval: 2mm, third interval: 6mm, fourth interval: 2mm, fifth interval: 1mm, sixth interval: 1.5mm). This nested arrangement allows the optical system to achieve the required focal length and image diameter while maintaining a compact overall form factor, as each lens element contributes to the cumulative optical power.
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 photographic objective lens with a large relative aperture and small volume, simplifying optical material variety and achieving ideal distortion and aberration performance.
Implementation Method 1
a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7, which are coaxially arranged along a transmission direction of incident light
Data Source
AI summary
A photographic objective lens includes seven lenses, wherein a first lens is a meniscus lens, a second lens is a meniscus lens, a third lens is a meniscus lens, a fourth lens is a biconcave lens, a fifth lens is a biconvex lens, a sixth lens is a biconvex lens, a seventh lens is a meniscus lens. The first lens has a first curved surface and a second curved surface, the second lens has a third curved surface and a fourth curved surface, the third lens has a fifth curved surface and a sixth curved surface, the fourth lens has a seventh curved surface and a eighth curved surface, the fifth lens has a ninth curved surface and a tenth curved surface, the sixth lens has a eleventh curved surface and a twelfth curved surface, and the seventh lens has a thirteenth curved surface and a fourteenth curved surface; wherein the first curved surface to the fourteenth curved surface are sequentially arranged along a transmission direction of incident light.