Vehicle Headlamp Translucent Body Signlight Generation
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Solution Overview
Problem
Existing motor vehicle headlight lighting devices struggle to meet legal requirements for light distribution above the light-dark line (HD line) with minimal glare, particularly in producing the 'signlight' area, which necessitates specific light intensities and distribution patterns.
Innovation Solution
A lighting device with an incidence boundary surface designed to allow light to exit from the light-transmitting body by inclining the incident boundary surface relative to the optical axis, enabling light to re-enter and be imaged above the HD line, with controlled emission and position adjustments to meet legal signlight requirements, using a single component without additional devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is directed above the HD line to meet signlight requirements, then illuminance levels are improved, but glare increases
Solution Approach 1:
The incident boundary surface is divided into different regions with different inclination angles. The first region has a first inclination angle that directs light away from the driver's eye to reduce glare, while the second region has a second inclination angle that directs light toward the sign area to provide adequate illumination. This local differentiation of surface properties allows simultaneous optimization of both glare reduction and signlight illuminance.
2Length of stationary object
If the optical body is made narrow to reduce vehicle width, then device dimensions are improved, but light distribution control becomes more difficult
Solution Approach 1:
The re-entry boundary surface is designed with a curved shape rather than a flat surface. This curvature allows the narrow optical body to effectively redirect light rays onto the projection device while maintaining compact dimensions. The curved surface geometry enables precise light control despite the reduced size of the optical body.
3Manufacturing precision
If additional components are added to control light distribution, then light control precision is improved, but device complexity increases
Solution Approach 1:
The light-guiding body is designed to perform multiple functions simultaneously: it guides light from the light source, creates the apron light distribution pattern, and generates the signlight above the HD line. By integrating these functions into a single component with strategically positioned boundary surfaces, the patent achieves precise light distribution control without adding separate components for each function.
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 produces a compliant signlight distribution with reduced glare, allowing for narrow optical bodies and increased width of the signlight area, while avoiding undesired reflections and color effects, and is capable of meeting requirements even during cornering without pivoting the lighting device.
Implementation Method 1
Light from the at least one light source is fed into the light-guiding body, wherein light propagates in the light-guiding body
Implementation Method 2
the projection device is designed as a projection lens arrangement or comprises one
Data Source
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AI summary
The invention relates to a lighting device (1) for a motor vehicle headlight for generating a light distribution with a light-dark boundary, a light source (10), a translucent body (100), a light feed element (101) for supplying light from the light source (10), and a projection device (200), wherein the translucent body (100) has a shutter device (103) with a shutter edge region (104), wherein the shutter device (103) is arranged in the direction of light propagation between the light feed element (101) and the projection device (200), and wherein light from the at least one light source (10) enters the translucent body (100) via the light feed element (101), which propagates in the translucent body (100) as a first light beam (S1), and wherein the first light beam (S1) is directed by the shutter device (103) to form a modified, second light beam (S2) is modified,that this second light beam (S2) is imaged by the projection device (200) as a light distribution (LV) with a light-dark boundary (HD), wherein the light-dark boundary (HD), in particular the shape and position of the light-dark boundary (HD), is determined by an aperture edge region (104) of the aperture device (103), and wherein the aperture device (103) is formed by boundary surfaces (105, 106) of the translucent body (100). A partial light beam (S1a) of the first light beam (S1) strikes one of the boundary surfaces (105, 106), the incident boundary surface (105), and at least a part (S1a') of the partial light beam (S1a) exits the translucent body (100) completely or partially as an exit light beam (S3) over a region (105') of the incident boundary surface (105), and wherein the exit light beam (S3) exits over one of the boundary surfaces (105, 106), the re-entry boundary surface (106),wholly or partially re-enters the light-guiding body (100) as the entrance light beam (S4), and wherein the entrance light beam (S4) or parts of the entrance light beam are projected by the projection optics device (200) as a signlight light beam (SL) into an area (B) of the light distribution located above the light-dark boundary, and are imaged in the photograph, for example as a signlight light distribution (SV).