Grating Plate Positioning for Vehicle Lamp Light Distribution
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Solution Overview
Problem
Conventional vehicle lamps face challenges in precisely controlling the positions and angles of lens elements to prevent over-diffraction or under-diffraction of light, leading to discomfort for oncoming drivers or insufficient lighting, due to the need for precise control of light distribution patterns.
Innovation Solution
A vehicle lamp design incorporating a projector lens, reflector, light emitting element, shield, and grating plate, where the grating plate is positioned below the optical axis and in front of the rear focal point of the projector lens to reflect and concentrate light, reducing stray light and chromatic dispersion around the cutoff line, and adjusting the angle between the grating plate and optical axis to enhance brightness in the dark zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If lens elements are precisely positioned and angled to control light diffraction, then light distribution is improved, but device complexity increases
Solution Approach 1:
The patent extracts the light control function from complex multi-element lens systems and implements it through a simplified grating plate structure positioned at a specific location (rear focal point area) in the optical path. This grating plate diffracts light to create the cutoff line without requiring multiple precisely-aligned lens elements, thereby reducing device complexity while maintaining effective light distribution control
Solution Approach 2:
The patent changes the control parameter from mechanical positioning and angling of multiple lens elements to the diffraction properties of a grating plate. By utilizing the diffraction angle parameter inherent to grating structures, the system achieves precise light distribution control through optical properties rather than mechanical adjustments, simplifying the overall device architecture
2Object-affected harmful factors
If lens elements are precisely positioned to control diffraction, then discomfort to oncoming drivers is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent removes the requirement for precise mechanical positioning of multiple lens elements by extracting the light control function to a grating plate whose diffraction characteristics inherently define the cutoff line position. This approach reduces manufacturing precision requirements as the grating structure's optical properties provide stable, repeatable light distribution without demanding tight mechanical tolerances
Solution Approach 2:
The grating plate performs self-alignment through its diffraction properties. The cutoff line position is determined by the grating's optical characteristics and its position relative to the light source, rather than requiring precise mechanical alignment during assembly. This self-service mechanism reduces the need for high-precision manufacturing and assembly operations
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 effectively reduces stray light and chromatic dispersion around the cutoff line, improving light concentration and allowing for better visibility of signs above the road by adjusting the angle of the grating plate, thus meeting regulatory standards and enhancing driver comfort.
Implementation Method 1
The grating plate is disposed below the optical axis and in front of the rear focal point of the projector lens for reflecting at least a portion of the light
Implementation Method 2
The lens elements 12As, 12Bs are for diffracting light emitted by the light emitting element 14
Implementation Method 3
The reflector 16 reflects light from the light emitting element 14
Data Source
AI summary
A vehicle lamp adapted to be installed on a vehicle includes a projector lens, a reflector, a light emitting element, and a grating plate. The projector lens has a light entry surface and alight exit surface. The light emitting element is disposed for emitting light towards the reflector, such that the light is reflected by the reflector to pass through the projector lens to form a light distribution pattern. The grating plate is for reflecting at least a portion of the light that has traveled ahead of a second focal point of the reflector and that has not passed through the light exit surface of the projector lens. An extension of the grating plate and the optical axis defines an angle between 0 degree and 45 degrees.