Dual Light Path Projection Optical System for Headlamp Efficiency
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Solution Overview
Problem
Current projection headlamps have low luminous efficiency due to limitations in improving transmission, blocking, and reflection factors, which are difficult to enhance, resulting in insufficient light for low and high beams, making it challenging to meet driver requirements for a brighter front field of view at night.
Innovation Solution
A dual light path forming type projection optical system that utilizes a prism lens to change the light path and add blocked upper reflecting light to both low and high beams, increasing luminance efficiency without requiring improvements in transmission, blocking, or reflection factors, by using a reflector with a funnel-shaped elliptical surface and an aspheric lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shield is used to block upper reflecting light to meet low beam regulations, then regulatory compliance is achieved, but luminous efficiency deteriorates due to light loss
Solution Approach 1:
A polarization angle prism lens is introduced as an intermediary component between the reflector and the road. This prism redirects the blocked upper reflecting light (which would otherwise be blocked by the shield) and adds it to the lower reflecting light path, enabling the system to comply with low beam regulations while recovering previously wasted light energy to improve overall luminous efficiency
Solution Approach 2:
The invention recovers the upper reflecting light that was previously discarded by the shield. By using the polarization angle prism to redirect this light into the useful beam path, the system recovers energy that would otherwise be lost, thereby improving luminous efficiency while maintaining regulatory compliance through the shield's blocking function
2Loss of energy
If transmission factor, blocking factor, and reflection factor are improved to increase luminous efficiency, then light quantity increases, but technical difficulty increases as these factors are very difficult to improve
Solution Approach 1:
The invention segments the light path into distinct components (upper reflecting light path and lower reflecting light path) and uses a polarization angle prism to selectively redirect only the upper reflecting light. This segmentation approach allows improvement of luminous efficiency by recovering specific light paths without requiring complex improvements to the overall transmission, blocking, or reflection factors of the entire system
Solution Approach 2:
The polarization angle prism lens serves as a relatively simple intermediary component that redirects light paths without requiring fundamental improvements to the reflector, shield, or lens transmission properties. This approach achieves luminous efficiency improvement through geometric redirection rather than through difficult material or design changes
3Reliability
If shield blocks upper reflecting light to ensure low beam area compliance, then legal requirements are met, but light quantity for low beam deteriorates
Solution Approach 1:
The polarization angle prism lens acts as a mediator that captures the blocked upper reflecting light and redirects it into the low beam path. This allows the shield to maintain its blocking function for regulatory compliance while the prism simultaneously adds the redirected light to the low beam, thereby increasing light quantity without compromising compliance
Solution Approach 2:
The invention merges the previously blocked upper reflecting light with the lower reflecting light in the low beam path. By combining these two light sources through the prism's redirection, the system achieves higher light quantity in the low beam while the shield continues to enforce area compliance
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
Significantly enhances light utilization and luminance efficiency, improving low beam performance by approximately 45% compared to conventional systems, allowing for brighter front and side field views while meeting regulatory requirements without technical difficulties in improving existing factors.
Implementation Method 1
a prism lens allowing the upper reflecting light to be emitted as a prism low beam in which the downward path is changed into the upward path
Implementation Method 2
a reflector allowing light generated from a light source to be formed into a lower reflecting light reflected to an upward path directing upward and an upper reflecting light reflected to a downward path directing downward
Implementation Method 3
an aspheric lens for generating a low beam by allowing the prism low beam to be added to the lower reflecting light and generating a high beam by allowing the prism high beam to be added to the lower reflecting light
Data Source
AI summary
A dual light path forming type projection optical system may include a reflector allowing light generated from a light source to be formed into a lower reflecting light reflected to an upward path directing upward and an upper reflecting light reflected to a downward path directing downward, a prism lens allowing the upper reflecting light to be emitted as a prism low beam in which the downward path is changed into the upward path and allowing the prism low beam to be changed into a prism high beam by changing an incident angle of the upper reflecting light, and an aspheric lens for generating a low beam by allowing the prism low beam to be added to the lower reflecting light and generating a high beam by allowing the prism high beam to be added to the lower reflecting light.