Six-Lens Optical Lens Design for Wide-Angle Imaging
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Solution Overview
Problem
Current optical lenses for image pick-up systems in autonomous vehicles and machine vision applications face challenges in achieving low fabrication costs, wide viewing angles, low thermal drift, and high imaging quality while maintaining a compact design.
Innovation Solution
The optical lens design consists of a first lens group with at least two lenses, including an aspheric lens, and a second lens group with at least four lenses, including an aspheric lens, arranged from the magnified side to the minified side, with specific refractive powers and dimensions that satisfy certain conditions to optimize imaging performance and reduce fabrication complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to improve imaging quality, then imaging quality is improved, but device complexity and fabrication cost increase
Solution Approach 1:
The optical lens is divided into two lens groups (first lens group with 2-3 lenses and second lens group with 4-6 lenses) separated by an aperture stop, allowing independent optimization of each group while maintaining overall system performance
Solution Approach 2:
At least one aspheric lens is used in the first lens group and at least one aspheric lens is used in the second lens group to correct optical aberrations and improve imaging quality without requiring additional spherical lenses
2Adaptability or versatility
If the lens diameter is increased to improve viewing angle, then viewing angle is widened, but device size and fabrication cost increase
Solution Approach 1:
The optical lens achieves a wide viewing angle (150 degrees or more) through optimized refractive power distribution and aspheric surface design rather than simply increasing lens diameter, allowing dynamic light path control across wide angles
Solution Approach 2:
The patent optimizes specific parameters including the ratio of lens diameters (D1/DL), the ratio of effective focal length to lens diameter (EFL/D1), and refractive power distribution to achieve wide viewing angle with controlled lens size
3Length of moving object
If the total track length is reduced to achieve compact design, then device size is reduced, but imaging quality and thermal drift performance deteriorate
Solution Approach 1:
The aperture stop is positioned at the minimum inner diameter location of the lens barrel, effectively nesting the stop within the lens structure to minimize total track length while maintaining optical performance
Solution Approach 2:
The patent uses aspheric lens surfaces to control light paths in three-dimensional space, allowing compact axial length (LT ≤ 15 mm) while maintaining wide viewing angle and high imaging quality through radial and tangential ray control
4Volume of stationary object
If the aperture stop is positioned at minimum inner diameter to reduce size, then device size is reduced, but light transmission and imaging quality may be affected
Solution Approach 1:
The aperture stop positioned at the minimum inner diameter location serves multiple functions: defining the optical aperture, blocking stray light, and acting as a mechanical reference for lens alignment, thereby maintaining imaging quality while minimizing size
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
This design achieves good imaging quality, wide viewing angles, and wide operating temperature ranges while minimizing fabrication costs and maintaining a compact form factor.
Implementation Method 1
The first lens group has at least two lenses that include at least one aspheric lens, the second lens group has at least four lenses that includes at least one aspheric lens
Data Source
AI summary
An optical lens includes a first lens group and a second lens group. The first lens group has at least two lenses that include at least one aspheric lens, the second lens group has at least four lenses that includes at least one aspheric lens, and a total number of lenses with refractive powers in the optical lens is smaller than nine. The first and the second lens groups include a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in order from the magnified side to the minified side. The first lens to the sixth lens have respective refractive powers of negative, negative, positive, positive, negative and positive.