Compact Optical Lens Layout for Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical systems for digital imaging devices struggle to achieve high resolution and compactness while maintaining low cost and large aperture, with challenges in correcting various aberrations with a small number of lens pieces.
Innovation Solution
An optical system configuration comprising a front group with a lens having positive refractive power and a rear group with a lens having negative refractive power, where the object side surface of the rear group lens is concave, and adhering to specific conditional formulas to optimize refractive indices, focal lengths, and curvature radii for aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a telephoto type power arrangement with strong positive refractive power on the object side and negative refractive power on the image side is adopted to achieve compactness, then the optical system becomes more compact, but it becomes more difficult to favorably correct various aberrations with a small number of lens pieces
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices (NdLA, NdLB, NdLC), Abbe constants (νdLA, νdLB, νdLC), and focal length ratios of the lens elements. Specifically, it sets constraints on parameters like 1.50 < NdLA < 1.70, 1.70 < NdLB < 1.90, and -0.60 < FLB/FLA < -0.30 to achieve optimal balance between compactness and aberration correction. This allows the optical system to maintain a telephoto configuration while correcting aberrations effectively through material and geometric parameter optimization.
Solution Approach 2:
The patent employs composite materials by combining lens elements with different refractive index characteristics and dispersion properties. It uses at least three different glass materials with specific refractive indices and Abbe constants to correct both spherical and chromatic aberrations simultaneously. The combination of high-refractive-index elements (for compactness) and low-dispersion elements (for aberration correction) creates a composite optical system that resolves the contradiction between size and optical quality.
2Device complexity
If the number of lens pieces is reduced to lower cost and simplify the structure, then the optical system becomes simpler and more cost-effective, but it becomes more difficult to correct various aberrations while maintaining high resolution
Solution Approach 1:
The patent merges multiple functions into fewer lens elements by using high-refractive-index glass materials that provide both compactness and aberration correction capabilities in single elements. The design consolidates the optical power and correction functions into a streamlined configuration with limited lens pieces, where each element is optimized to perform multiple roles (focusing, spherical aberration correction, chromatic aberration correction) simultaneously, thereby reducing the total number of components while maintaining high correction performance.
Solution Approach 2:
The patent achieves effective aberration correction with fewer lens pieces by changing the material parameters to extreme values that maximize optical efficiency. It uses glass materials with refractive indices >1.70 and specific Abbe constants to achieve strong aberration correction power in each element. The constrained parameter ranges (e.g., 1.70 < NdLB < 1.90, 20 < νdLB < 40) ensure that each lens piece contributes maximally to correction, allowing the system to achieve high performance with minimal components.
3Measurement precision
If high resolution performance is achieved through pixel-intensive solid-state image sensors, then the imaging quality improves, but the optical system requires higher performance standards that increase complexity and cost
Solution Approach 1:
The patent optimizes optical parameters to match the resolution capabilities of pixel-intensive sensors by controlling wavefront error and aberration levels within specific ranges. It sets constraints on parameters like focal length ratios (e.g., -0.60 < FLB/FLA < -0.30) and refractive indices to ensure the optical system delivers sufficient resolution (e.g., MTF performance) without requiring excessive optical complexity. This parameter optimization allows the system to provide just enough performance for high-resolution sensors without unnecessary complexity.
Solution Approach 2:
The patent replaces complex mechanical lens configurations with optimized material properties and geometric arrangements. Instead of adding more lens elements or complex adjustment mechanisms to achieve high resolution, it uses precise control of refractive indices, Abbe constants, and surface curvatures to achieve the required optical performance. This substitution of material and geometric optimization for mechanical complexity reduces system complexity while maintaining high resolution capability.
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 and high-performance optical system with effective aberration correction, achieving lightweight and low-cost imaging devices suitable for digital cameras and imaging devices in moving bodies.
Implementation Method 1
the front group has a lens A having a positive refractive power disposed on the most object side
Implementation Method 2
the rear group has a lens B having a negative refractive power disposed on the most image side
Data Source
AI summary
In order to solve the problem described above, an optical system according to the present invention includes, in order from the object side, a front group, a stop, and a rear group, in which the front group has a lens A having a positive refractive power on the most object side, and the rear group has a lens B having a negative refractive power on the most image side, an object side surface of the lens B has a concave surface on the object side, and the optical system satisfies the predetermined conditional formulas.