Aspherical In-Vehicle Camera Optics for Wide View and Central Magnification
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Solution Overview
Problem
Conventional optical systems for in-vehicle cameras face challenges in achieving a balance between wide angle of view and sufficient imaging magnification in the central area, with existing solutions either having insufficient magnification or a narrow angle of view.
Innovation Solution
An optical system comprising a front lens unit with positive or negative refractive power, a diaphragm, and a rear lens unit with positive refractive power, featuring an aspherical lens with a positive refractive power on the optical axis and a specific aspherical surface design that satisfies conditional expressions to achieve large imaging magnification and wide angle of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an aspherical lens with a specific aspherical surface design is used, then imaging magnification in the central area is increased, but the angle of view may be reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the aspherical surface parameters (off-axis radius of curvature larger than on-axis radius of curvature) and the position of the aspherical lens within the optical system. By adjusting these parameters and satisfying specific conditional expressions, the system achieves both increased central magnification and maintained wide angle of view
Solution Approach 2:
The patent resolves the contradiction by adding dimensional considerations - specifically by controlling the off-axis radius of curvature to be larger than the on-axis radius of curvature. This dimensional approach to the aspherical surface design enables simultaneous achievement of high central magnification and wide angle of view
2Measurement precision
If the aspherical lens is positioned closer to the object, then central area magnification is improved, but distortion control becomes more difficult
Solution Approach 1:
The patent controls distortion by adjusting the aspherical surface parameters and the lens position parameter (D1s/L ratio). By satisfying the conditional expression 0.45 < D1s/L < 0.65, the system achieves optimal balance between magnification and distortion control
Solution Approach 2:
The aspherical lens acts as an intermediary element that mediates between the object and the rest of the optical system. Its specific aspherical surface design and positioned placement enable it to control both magnification and distortion simultaneously
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 optical system effectively captures images with increased magnification in the central area while maintaining a wide angle of view, suitable for in-vehicle cameras, by controlling distortion and aberrations through the aspherical lens design and diaphragm placement.
Implementation Method 1
an aspherical lens that has a positive refractive power on an optical axis... The aspherical lens has an aspherical surface on the object side in which an off-axis radius of curvature is larger than an on-axis radius of curvature
Data Source
AI summary
An optical system consists of a front lens unit having a positive or negative refractive power, a diaphragm, and a rear lens unit having a positive refractive power, which are arranged in this order from an object side to an image side. The front lens unit includes an aspherical lens that has a positive refractive power on an optical axis, and is disposed closest to an object. The aspherical lens has an aspherical surface on the object side in which an off-axis radius of curvature is larger than an on-axis radius of curvature. A predetermined condition is satisfied.