Twelve-Lens Camera Optical Lens for Low Distortion and High Magnification
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Solution Overview
Problem
Camera optical lenses for industrial microscopes face challenges in achieving high magnification, low distortion, and long working distance while maintaining good optical performance, as higher magnification increases the influence of thickness and refractive index changes on imaging quality.
Innovation Solution
A camera optical lens design comprising twelve lenses, with specific focal lengths, refractive powers, and curvature radii, and made of glass, that satisfies relational expressions for combined focal lengths, thicknesses, and numerical aperture to ensure low distortion, large magnification, and long working distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the magnification of the microscope objective lens is increased to achieve high resolution, then the numerical aperture increases, but the influence of thickness and refractive index changes on imaging quality becomes more obvious, making it difficult to maintain high imaging quality
Solution Approach 1:
The optical lens is divided into multiple lens elements (at least two lens elements) with different refractive indices and dispersion characteristics. This segmentation allows each element to contribute differently to the overall optical performance, enabling high magnification while correcting aberrations caused by thickness and refractive index variations.
Solution Approach 2:
Different regions of the optical system use lens elements with locally optimized properties. The patent specifies different refractive indices (nd1, nd2) and Abbe numbers (vd1, vd2) for different lens elements, allowing each element to be optimized for its specific position and function in the optical path, thereby maintaining imaging quality at high magnification.
2Measurement precision
If a twelve-piece lens structure is adopted to meet diversified user requirements and continuously increased imaging quality requirements, then the optical performance improves, but the device complexity increases
Solution Approach 1:
The twelve-piece lens structure is segmented into functional groups with specific roles. The patent defines particular lens elements with specific refractive power characteristics (positive and negative) and structural parameters (curvature radii, thickness ratios) to distribute the optical correction functions across multiple elements, achieving high imaging quality while managing complexity through functional segmentation.
Solution Approach 2:
The patent optimizes specific parameters of the lens elements to balance performance and complexity. By defining specific relationships between focal lengths (f1/f, f2/f, f3/f), thickness ratios (d1/TTL, d3/TTL, d5/TTL), and curvature radii, the design achieves high imaging quality with a manageable twelve-element structure rather than an uncontrolled increase in complexity.
3Measurement precision
If the numerical aperture is increased to achieve high resolution, then the magnification increases, but the distortion becomes more significant, making it difficult to achieve low distortion with large magnification
Solution Approach 1:
The optical system is segmented into multiple elements with alternating positive and negative refractive powers. This segmentation allows different elements to correct different types of aberrations, including distortion. The patent specifies that certain lens elements (first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth) have specific refractive power signs to collectively correct distortion while maintaining high numerical aperture and magnification.
Solution Approach 2:
Different lens elements are designed with local quality optimizations to address specific aberration types. The patent defines specific curvature radius relationships (R1, R2, R3, R4, etc.) and thickness ratios for different elements, allowing each element to contribute to distortion correction in its local region of the optical path, achieving low overall distortion despite high magnification.
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 design achieves good optical performance with low distortion, large magnification, and long working distance, effectively correcting aberrations and maintaining high resolution, as demonstrated by the specified relational expressions and design data.
Implementation Method 1
a camera optical lens includes from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, and a twelfth lens
Data Source
AI summary
The present disclosure relates to the field of camera optical lenses, and discloses a camera optical lens. The camera optical lens includes from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, a sixth lens, a seventh lens, an eighth lens and ninth lens, a tenth lens, an eleventh lens, and a twelfth lens, following relational expressions are satisfied: −0.80≤f12/f10_11≤−0.50; 0.80≤f7/f≤1.80; −83.00≤f56/(d9+d11)≤−4.00; and 0.40≤NA*f/WD≤0.60. The camera optical lens of the present disclosure has good optical performance, and has the characteristics of low distortion, large magnification and long working distance.