Multi-lens Lamp Assembly with Aspherical Lens
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Solution Overview
Problem
Current lamp designs, particularly adaptive driving beam (ADB) headlamps, face challenges in achieving high optical performance with a long focal length while minimizing the number of lenses to reduce complexity and cost, as existing solutions are not economically feasible or productive.
Innovation Solution
A multi-lens assembly comprising two spherical lenses and one aspherical lens, optimized with specific optical design parameters, including Abbe numbers, refractive indices, and shapes, to achieve a half field of view of about 20 degrees and a numerical aperture of 0.75 or more, while minimizing lens count and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to ensure sharp contrast ratio and preserve shape distortion in individual segments, then optical performance is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the functions of multiple lenses into a single integrated lens assembly. This single lens is designed with specific optical characteristics (half field of view of about 20 degrees, numerical aperture of 0.75 or more) that previously required multiple separate lenses to achieve, thereby reducing device complexity while maintaining optical performance
Solution Approach 2:
The patent changes the optical parameters of the lens system by specifying precise values for half field of view (about 20 degrees) and numerical aperture (0.75 or more). By optimizing these parameters, the patent achieves high optical performance with a single lens rather than requiring multiple lenses with different parameters
2Measurement precision
If the number of lenses is increased to ensure sharp contrast ratio and preserve shape distortion in individual segments, then optical performance is improved, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent merges multiple lens manufacturing steps into a single lens production process. By designing a single integrated lens with optimized optical parameters, the patent eliminates the need to manufacture and assemble multiple separate lenses, thereby reducing manufacturing cost and process complexity while maintaining high optical performance
Solution Approach 2:
The patent employs a single lens design that replaces expensive multi-lens assemblies. This single lens is manufactured with optimized parameters (half field of view of about 20 degrees, numerical aperture of 0.75 or more) to achieve the performance previously requiring multiple expensive components, thereby reducing overall manufacturing cost
3Illumination intensity
If the focal length is increased to achieve long distance illumination, then illumination capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent changes the optical parameters to achieve long focal length with a single lens. By specifying a half field of view of about 20 degrees and numerical aperture of 0.75 or more, the patent creates an optical system that provides long distance illumination capability without requiring the complexity of multi-lens assemblies traditionally used for such applications
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 ensures higher optical performance with fewer lenses, achieving the desired optical performance, improved durability, and reduced manufacturing costs by using a plastic aspherical lens between glass spherical lenses, and includes an infrared blocking coating for heat management.
Implementation Method 1
an aspherical lens 120 disposed behind the outer spherical lens 110, made of a plastic material, and having a numerical aperture (NA) of 0.7 or more
Implementation Method 2
includes an infrared blocking coating for heat management
Data Source
AI summary
A multi-lens assembly for a lamp requiring a long focal length and higher optical performance, such as an adaptive driving beam (ADB) head lamp. The multi-lens assembly lamp may ensure higher optical performance with fewer lenses. More particularly, the multi-lens assembly may ensure a desired optical performance by including appropriately-arranged three lenses, i.e., two spherical lenses and one aspheric lens, and optimizing an optical design therebetween.