Projector Headlamp Shade Removal via Reflector Optics
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Solution Overview
Problem
Conventional vehicle headlamps with physical shades are prone to mechanical failures, result in unexpected cut-off lines for high beams, and have lower light utility due to light blocking, necessitating an improved design without physical shades.
Innovation Solution
A projector-type vehicle headlamp design that eliminates the physical shade by using a first optics, such as a reflector, to generate multiple images of the light source above a focal surface, allowing for low beam generation without a physical shade, thereby simplifying the structure and increasing light utility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a physical shade is used to generate low beam, then the cut-off line can be formed to remove glare, but the headlamp structure becomes more complex and mechanical failures may occur
Solution Approach 1:
The patent removes the physical shade component entirely from the headlamp system. Instead of using a mechanical shade to block light and form the cut-off line, the invention uses optical design of the reflector and lens to achieve the same low beam effect without any moving parts or mechanical components, thereby eliminating mechanical failures and simplifying the structure.
Solution Approach 2:
The patent replaces the mechanical shade system with an optical system. The cut-off line is formed through the optical design of the reflector and lens rather than through mechanical blocking, substituting a mechanical system with an optical one to improve reliability and reduce complexity.
2Loss of energy
If a physical shade is used to block light for low beam, then the cut-off line is formed, but light utility rate decreases due to light blocking
Solution Approach 1:
The patent changes the optical parameters of the reflector and lens to redirect light distribution. By adjusting the reflector geometry and lens focal properties, the system achieves effective low beam illumination with proper cut-off line formation while minimizing light loss, thereby improving light utility rate.
3Ease of operation
If a physical shade is used, then low beam function is achieved, but unexpected cut-off lines may be created for high beam
Solution Approach 1:
By removing the physical shade entirely, the patent eliminates the source of unexpected cut-off lines in high beam mode. The optical system naturally provides different light distribution patterns for different beam modes without mechanical interference, ensuring reliable beam operation.
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 a more reliable and efficient low beam operation without mechanical failures and enhances light distribution by eliminating the need for a physical shade, achieving a higher light utility rate and improved lighting performance.
Implementation Method 1
a first optics for receiving light from the first light source and directing the received light towards the lens
Data Source
AI summary
A projector-type vehicle headlamp not having a physical shade is disclosed. The vehicle headlamp comprises a first light source for emitting light, a lens through which the light exits the headlamp, and a first optics for receiving light from the first light source and directing the received light towards the lens, with the lens having a focal surface between the first optics and the lens, and with the lens having an optical axis. The first optics is configured to generate multiple images of the first light source on the focal surface above an intersection line of the focal surface with a reference plane, with the reference plane containing the optical axis of the lens, and with the reference plane enclosing an angle in the range of 0-45 degree with a horizontal plane when the headlamp is installed in a vehicle. The first optics is a curved reflector with an elliptical side edge.