Vehicle Lighting Device Using Laser and Phosphor Screen
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Solution Overview
Problem
Current vehicle lighting devices are bulky and limited in their ability to produce multiple illumination characteristics from a single device, as they rely on large light sources like incandescent and LED lamps, making it difficult to achieve various front lighting needs such as parking lights, daytime running lights, and side-pointing beams.
Innovation Solution
A compact vehicle lighting device is developed using a high-luminance light-emitting device, such as a laser, combined with a screen-like phosphor member and optical elements to generate multiple directional output characteristics by changing the light's physical properties like color and polarization, allowing for the production of various light cones from a single device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light sources (incandescent and LED lamps) are used, then sufficient illumination intensity is achieved, but the device volume becomes large
Solution Approach 1:
The patent replaces conventional mechanical light sources (incandescent bulbs, LED lamps) with a laser-based light-emitting device. This substitution enables compact device volume while maintaining sufficient illumination intensity, as lasers provide high brightness in a small form factor compared to traditional lighting technologies.
Solution Approach 2:
The patent changes the fundamental parameter of light source brightness by using laser technology, which provides significantly higher luminance than conventional LEDs or incandescent lamps. This parameter change allows the system to achieve required illumination levels with a much smaller device volume.
2Device complexity
If a single lighting device is used, then device complexity is reduced, but the ability to produce multiple illumination characteristics is limited
Solution Approach 1:
The patent introduces dynamic control capabilities to a single lighting device through movable components (such as movable mirrors or adjustable optical elements) that can change the light path and beam direction. This enables one device to produce multiple illumination characteristics including different beam patterns, directions, and modes (e.g., high beam, low beam, fog lights) without requiring multiple fixed lighting devices.
Solution Approach 2:
The patent designs a single lighting device that performs multiple functions by incorporating adjustable optical components. The device can generate various illumination characteristics (different beam patterns, directions, and types) from one light source, making it a universal lighting solution that replaces what would traditionally require multiple separate lighting devices.
3Adaptability or versatility
If multiple light-emitting devices are used to achieve different illumination characteristics, then illumination versatility is improved, but device volume increases
Solution Approach 1:
The patent merges multiple lighting functions into a single integrated device. By combining a laser light source with adjustable optical components, the system consolidates what would traditionally require multiple separate light-emitting devices into one compact unit, achieving various illumination characteristics without increasing overall device volume.
Solution Approach 2:
The patent uses dynamic optical components within a single device to achieve multiple illumination characteristics. Movable mirrors, adjustable lenses, or reconfigurable optical elements allow one light source to produce different beam patterns and directions, eliminating the need for multiple fixed light-emitting devices and reducing total device volume.
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 enables the creation of a compact lighting system capable of producing multiple illumination patterns, including sharp boundary lines and high contrast, meeting the diverse front lighting needs of contemporary vehicles with improved brightness and efficiency.
Implementation Method 1
The screen-like member is formed as a plate or film and the plate or film is made of phosphor. The phosphor composition of the phosphor plate or phosphor film is made spacially variable
Implementation Method 2
The light-emitting device is preferably a laser (light amplification by stimulated emission of radiation) and/or a high luminance light-emitting device
Data Source
Figure 1A
Figure 1B~1C
Figure 2~3
AI summary
The invention relates to a lighting device (1) comprising at least one light- emitting device (3) and at least one optical element (7) in an optical path (15) of the light-emitting device (3) for generating output illumination having at least one directional characteristic. The lighting device according to the invention further comprises a screen- like member (5) for changing at least one physical property of light passing through it and an optical device (4) for generating an intermediate image (9) on the screen-like member (5), both located in the optical path (15) between the light-emitting device (3) and the optical element (7), wherein the optical element (7) is an optical element (12) for projecting said image (9). The invention further relates to a corresponding method of generating output illumination having a plurality of directional characteristics.