Six-Lens Imaging Optics for Compact High-Resolution Vehicle Cameras
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
On-board cameras require downsizing to fit spatially limited positions such as side mirrors, while maintaining high resolution and avoiding increased size due to larger apertures in existing imaging lens systems.
Innovation Solution
An imaging lens system with specific focal length and Abbe's number constraints for lenses, including glass and plastic materials, and aspherical surfaces to correct aberrations, allowing for a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the aperture of the first lens is increased to achieve high resolution, then the imaging performance is improved, but the size of the optical system increases
Solution Approach 1:
The patent applies parameter changes by optimizing the focal length ratios (|f1/f|≥2.5, |f2/f|≥2.0, |f3/f|≤8.0) and Abbe's number (νd4≥60) to achieve a balance between aperture size and system compactness. This allows the first lens to maintain adequate aperture for high resolution while keeping the overall optical system size reduced through coordinated parameter optimization across multiple lenses.
Solution Approach 2:
The patent employs composite material strategies by specifying different glass materials for the first three lenses (with νd1≥20, νd2≥20, νd3≥20) and the fourth lens (with νd4≥60), creating a composite optical system that leverages the complementary properties of different glass types to achieve both high resolution and compact dimensions through superior aberration correction.
2Measurement precision
If the number of lenses is increased to improve imaging quality, then the resolution is improved, but the device complexity increases
Solution Approach 1:
The patent optimizes the imaging quality of a six-lens system by precisely controlling the focal length parameters (|f1/f|≥2.5, |f2/f|≥2.0, |f3/f|≤8.0) and material properties (νd1≥20, νd2≥20, νd3≥20, νd4≥60), which enables adequate correction of spherical aberration and other optical imperfections while maintaining a manageable six-lens configuration rather than requiring more complex multi-element designs.
3Volume of moving object
If the optical system is downsized for spatial constraints, then the compactness is improved, but the manufacturing precision becomes more difficult to maintain
Solution Approach 1:
The patent establishes parameter ranges (|f1/f|≥2.5, |f2/f|≥2.0, |f3/f|≤8.0, νd4≥60) that define a design space where compact dimensions and manufacturing feasibility coexist. These constraints guide the design of lens curvatures, thicknesses, and spacings to achieve downsizing while maintaining tolerable manufacturing precision requirements.
Solution Approach 2:
The patent specifies glass material properties (νd1≥20, νd2≥20, νd3≥20, νd4≥60) that facilitate compact design with manageable manufacturing precision. The selection of glass types with appropriate refractive indices and dispersion properties enables the compact optical system to achieve desired imaging performance without excessive sensitivity to manufacturing variations.
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 system achieves high resolution and downsizing, with improved weather resistance and reduced manufacturing costs, while maintaining imaging performance.
Implementation Method 1
an imaging lens system includes, sequentially from an object side toward an image side, a first lens having negative power, a second lens having negative power, a third lens having positive power, an iris, a fourth lens having positive power, and a fifth lens and a sixth lens constituting a cemented lens
Data Source
AI summary
An imaging lens system that includes a first lens having negative power, a second lens having negative power, a third lens having positive power, an iris, a fourth lens having positive power, and a fifth lens and a sixth lens constituting a cemented lens, one of the lenses having negative power and another of the lenses having positive power, the imaging lens system satisfying −5.0<f1/f<−3.0, 2.7<f4/f<3.1, νd4>60, and 6.0<f3/f<10.0, where f1 is defined as a focal length of the first lens, f4 is defined as a focal length of the fourth lens, νd4 is defined as an Abbe's number of a d-line of the fourth lens, f3 is defined as a focal length of the third lens, and f is defined as a focal length of an entire optical system.