Vehicle HUD Projection Lens Layout for Wider FOV and Aberration Control
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Solution Overview
Problem
Existing projection lenses for vehicle-mounted HUD systems lack versatility in adapting to different image sources and suffer from poor optical performance due to harsh usage environments, leading to compromised imaging quality.
Innovation Solution
A projection lens design comprising a front lens group with a negative first lens and a rear lens group, featuring specific curvature ratios and configurations, including a stop between the groups, to correct aberrations and enhance optical performance, suitable for both DLP and LCOS systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing optical designs of projection lenses are used, then the structure is simple, but the adaptability to different types of image sources is poor
Solution Approach 1:
The projection lens is designed with a multi-group structure (first lens group with negative power, second lens group with positive power, and third lens group with negative power) that can adapt to different types of image sources including DLP and LCOS systems. The specific arrangement and power distribution of lens groups enable the same lens design to work with multiple image source types, achieving universality without requiring separate optical designs for each system.
2Reliability
If existing projection lenses are used in harsh vehicle environments, then the device complexity remains the same, but the optical performance deteriorates
Solution Approach 1:
Different lens groups are assigned specific functions to address particular optical issues: the first lens group with negative power corrects field curvature and distortion, the second lens group with positive power provides main focusing power, and the third lens group with negative power corrects chromatic aberration. This localized optimization of each lens group's properties ensures high optical performance and reliability in harsh vehicle environments.
Solution Approach 2:
The projection lens is divided into multiple independent lens groups with distinct optical powers and functions. This segmentation allows each group to be optimized for specific correction tasks while working together as a unified system, improving overall optical performance without requiring a completely complex monolithic design.
3Area of moving object
If the field of view is increased by using a concave second surface, then the FOV value increases by 4° to 8°, but the manufacturing precision requirements increase
Solution Approach 1:
The second surface of the first lens is designed as a concave surface with a specific radius of curvature range (R12: -20mm to -28mm). By optimizing this parameter within a defined range, the field of view is increased by 4° to 8° while maintaining manufacturability. The specified range provides sufficient design freedom to achieve the desired FOV expansion without requiring ultra-precise manufacturing tolerances.
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 design improves clarity and adaptability to multiple image sources, providing excellent projection imaging effects with increased field of view and reduced aberrations, ensuring clear and immersive visual experiences for vehicle-mounted HUD applications.
Implementation Method 1
the first lens has a negative optical power, and light rays exiting the first lens raise their height upon incidence on the second lens
Data Source
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AI summary
Embodiments of the present disclosure provide a projection lens, a vehicle-mounted HUD, and a vehicle; wherein the projection lens includes, from an object side toward an image side along the same optical axis, a front lens group, a rear lens group, and a stop; wherein the stop is located between the front lens group and the rear lens group; the front lens group includes at least a first lens and a second lens, and the second lens is located between the first lens and the stop; wherein the first lens has a negative optical power, and light rays exiting the first lens raise their height upon incidence on the second lens. The projection lens in the embodiments of the present disclosure has good lens performance. (FIG. 1)