Projection Lens Layout for High-Definition Vehicle HUD Imaging
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Solution Overview
Problem
Existing projection lenses in augmented display head-up displays for vehicles suffer from low definition and reliability, which affects imaging quality and fails to meet high definition and reliability requirements.
Innovation Solution
A lens design comprising a first lens group with a positive-negative-negative-positive focal power architecture and a second lens group with a negative-positive-positive-positive focal power architecture, along with specific focal length and curvature radius ranges, to enhance imaging capability and definition while improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional projection lens design is used, then the device complexity is low, but the definition and imaging capability are insufficient
Solution Approach 1:
The lens is divided into two lens groups (first lens group with four lens elements and second lens group with four lens elements) separated by an aperture stop, allowing each group to be optimized independently for specific aberration correction while achieving high definition imaging
Solution Approach 2:
Different lens elements are assigned specific focal powers (positive or negative) based on their position in the optical path. The first lens group follows a positive-negative-negative-positive sequence while the second lens group follows a negative-positive-positive-positive sequence, with each element's curvature and focal power locally optimized to correct specific aberrations and achieve high definition imaging
2Manufacturing precision
If more lens elements are added to improve imaging capability, then the definition improves, but the manufacturing cost increases
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element including focal power (positive or negative), curvature radius ratios (e.g., R1/EFL between 2-5, R2/EFL between -10 to -3), and group focal lengths (EFL1 between -58mm to -40mm, EFL2 between 19mm to 25mm). These parameter optimizations enable high definition imaging with exactly eight lens elements, avoiding both insufficient performance and excessive complexity
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 proposed lens design improves imaging capability and definition, meeting high definition and reliability requirements, and reduces the number of lens elements to lower costs.
Implementation Method 1
a first one, a second one, a third one, and a fourth one among the lens elements closest to the image side in the first lens group have a positive focal power, a negative focal power, a negative focal power, and a positive focal power, respectively
Data Source
Figure 1A~1B
Figure 2~3
Figure 4
AI summary
A lens (100), a projection apparatus (400), a display apparatus (500), and a transportation means, and pertain to the field of optical technologies. The lens (100) includes a first lens group (10), an aperture stop (20), and a second lens group (30) that are arranged from an image side to an object side. The first lens group (10) includes at least four lens elements. In a direction from the image side to the object side, a first one, a second one, a third one, a fourth one among the lens elements closest to the image side in the first lens group (10) have a positive focal power, a negative focal power, a negative focal power, and a positive focal power. The second lens group (30) includes at least four lens elements. In the direction from the image side to the object side, a first one, a second one, a third one, a fourth one among the lens elements closest to the aperture stop (20) in the second lens group (30) have a negative focal power, a positive focal power, a positive focal power, and a positive focal power. The lens (30) has high definition and high reliability, and can meet high definition and high reliability requirements for projection.