Meta-Lens Vehicle Headlight for Brightness Without Larger Optics
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Solution Overview
Problem
Existing vehicle headlights using convex lenses increase in size to maintain light distribution and resolution, leading to decreased brightness due to the enlarged image of the light source when viewed through the projection lens.
Innovation Solution
Employing a meta-lens with nanostructures that reduce the divergence angle of light, allowing the light to be efficiently incident on the projection lens while maintaining a smaller image size and reducing the need for a larger projection lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a convex lens is used as the primary lens to reduce the divergence angle of light, then the light can be efficiently incident on the projection lens, but the image of the light source appears larger than actual size and the light distribution pattern becomes large, decreasing resolution and brightness
Solution Approach 1:
The patent changes the optical parameters by replacing the convex lens with a meta-lens having specific nanostructure dimensions (width smaller than the largest wavelength of light). This parameter change allows the system to achieve both efficient light incident on the projection lens and maintained resolution/brightness by controlling the image size to be equal to or smaller than the actual light source size.
Solution Approach 2:
The patent replaces the conventional convex lens (mechanical/optical system) with a meta-lens based on nanostructures. This substitution enables precise control over light propagation characteristics, achieving the dual goal of efficient light transmission and maintained image quality without requiring enlargement of the projection lens.
2Illumination intensity
If the projection lens is enlarged to move it away from the primary lens to prevent the light distribution pattern from becoming large, then the resolution and brightness are maintained, but the size of the vehicle headlight increases
Solution Approach 1:
The patent changes the primary lens parameter from a conventional convex lens to a meta-lens with specific nanostructure dimensions. This parameter change fundamentally alters the optical behavior, allowing the projection lens to remain small while still achieving the desired light distribution pattern, resolution, and brightness without increasing the overall headlight size.
Solution Approach 2:
The patent substitutes the convex lens with a meta-lens system that provides superior control over light propagation. This substitution eliminates the need to enlarge the projection lens to maintain optical performance, thereby preventing an increase in the overall headlight volume while preserving brightness and resolution.
3Productivity
If a convex lens is used as the primary lens, then the light divergence angle is reduced, but the image of the light source appears larger than actual size at a position farther than actual position
Solution Approach 1:
The patent changes the optical parameters by using a meta-lens with nanostructures of specific dimensions (width smaller than the largest wavelength of light emitted from the light source). This parameter change enables the system to reduce the divergence angle of light while simultaneously controlling the image size to be equal to or smaller than the actual light source size, eliminating the magnification effect of conventional convex lenses.
Solution Approach 2:
The patent replaces the convex lens with a meta-lens system that provides independent control over both divergence angle and image size. This substitution allows the light to be efficiently incident on the projection lens while maintaining or reducing the image size of the light source, overcoming the limitation of conventional lens design.
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 meta-lens effectively suppresses the increase in size and maintains brightness and resolution by efficiently directing light to the projection lens, even with a smaller lens configuration.
Implementation Method 1
a meta-lens including a meta-region in which a plurality of nanostructures each having a width smaller than a largest wavelength of light emitted from the light source is arranged and through which the light emitted from the light source is transmitted
Data Source
AI summary
A vehicle headlight (1) includes a meta-lens (30), wherein the meta-lens (30) reduces a divergence angle of a light (L) incident on a meta-region from a light source (20), and in a case where the light source (20) is viewed from a side of a projection lens (50) through the meta-region, an image (20′) of the light source (20) appears at a position farther than a position of the light source (20), and also appears smaller than an image (20″) of the light source (20) seen in a case where a convex lens (30″) is arranged instead of the meta-lens (30) so as to emit the light (L) from the light source (20) at the same divergence angle as the light emitted from the meta-lens (30), and the light source (20) is viewed from the side of the projection lens (50) through the convex lens (30″).