Vehicle Light Guide Layout for Independent Tail and Brake Lamps
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Solution Overview
Problem
In vehicle lighting tools with light guide bodies, when the brake lamp is turned on, the tail lamp is inadvertently activated due to light guidance, resulting in an unintended light emitting surface and a poor appearance.
Innovation Solution
A lighting tool configuration with a first and second light source, each with a corresponding light guide body, featuring a branch emission part and a branch incidence part to control light guidance, ensuring that light is only guided from one side and improving the appearance when the tool is turned on.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light is guided from one light guide body to another light guide body to satisfy legal light emitting area requirements, then the brake lamp can meet regulatory standards, but the tail lamp is inadvertently activated causing unintended light emission and poor appearance
Solution Approach 1:
The light guide body is divided into multiple independent light guide portions (first light guide portion and second light guide portion), each capable of independently guiding light. This segmentation allows selective activation of specific light guide portions based on the lighting mode, preventing unintended light emission while maintaining compliance with regulatory requirements.
Solution Approach 2:
The lighting system dynamically controls which light guide portions are activated based on the operating mode (tail lamp mode or brake lamp mode). In tail lamp mode, only the second light guide portion is activated. In brake lamp mode, both light guide portions are activated. This dynamic control eliminates the harmful effect of unintended light emission while maintaining reliability.
2Device complexity
If a single light guide body is used to simplify the structure, then manufacturing complexity is reduced, but light cannot be selectively guided to different regions for different lighting modes
Solution Approach 1:
The light guide body is segmented into multiple light guide portions with distinct functions. The first light guide portion guides light for the brake lamp, while the second light guide portion guides light for the tail lamp. This segmentation provides the adaptability to selectively activate specific portions based on lighting mode, while the overall integrated structure maintains reasonable manufacturing complexity.
Solution Approach 2:
Different regions of the light guide body have different optical properties and functions. The first light guide portion has characteristics optimized for brake lamp illumination, while the second light guide portion is optimized for tail lamp illumination. This local differentiation enables selective light guidance without requiring completely separate light guide bodies.
3Illumination intensity
If light passes through space between neighboring light guide bodies to suppress luminance irregularity, then light emitting surface uniformity is improved, but light leakage occurs causing unintended activation of adjacent lighting zones
Solution Approach 1:
The light guide body is segmented into distinct light guide portions that are optically isolated from each other. This segmentation prevents light from leaking into adjacent zones while still allowing each portion to maintain uniform light emission through its own internal optical design, eliminating the need for light to pass through spaces between neighboring guide bodies.
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
This configuration allows for precise control of light emission, ensuring that the tail lamp and brake lamp operate independently, enhancing the appearance and functionality of the vehicle lighting system.
Implementation Method 1
light emitted from the light source enters the light guide body from an incidence surface provided on a base end side of the light guide body, and the light is guided toward a tip side of the light guide body while repeating reflection in the light guide body
Implementation Method 2
light reflected by a plurality of reflection cuts provided on a back surface side of the light guide body is emitted from the front surface side of the light guide body to the outside of the light guide body
Data Source
AI summary
A lighting tool for a vehicle includes a first light source and a second light source, a first-light-guide-body that guides first light emitted from the first light source, and a second-light-guide-body that guides second light emitted from the second light source, the first-light-guide-body has a rod-shaped first light guide part, a first incidence part located on a base end side of the first light guide part, and a branch emission part that emits some of first light, which is guided in the first light guide part, to an outside of the first light guide part, and the second-light-guide-body has a rod-shaped second light guide part, a second incidence part located on a base end side of the second light guide part, and a branch incidence part that causes first light, which is emitted from the branch emission part, to enter the second light guide part.