Vehicle Lamp Light Guide Layout for Distinct Turn Signal Emission
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Solution Overview
Problem
Existing vehicle lamp units fail to differentiate light emission feeling and range effectively between position and turn signal lamps, even when using shared LED light sources, leading to similar light emission characteristics.
Innovation Solution
A lamp unit design featuring a first and second light source with distinct light guide bodies, where the second light guide body overlaps the first from the front and protrudes outward, allowing partial transmission of light from the first guide body through the second to the outer lens, enabling differentiation in light emission feeling and range between turn signal and position lamp functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a shared outer lens is used for both position lamp and turn signal lamp, then the lamp unit size is reduced, but the light emission feeling and range cannot be differentiated between the two lamp functions
Solution Approach 1:
The patent divides the light guiding function into separate light guide bodies for different lamp functions. The position lamp has its own light guide body, and the turn signal lamp has its own light guide body, allowing each to control light emission characteristics independently while sharing the common outer lens.
Solution Approach 2:
Different light guide bodies are designed with different optical properties and structures tailored to specific lamp functions. The position lamp light guide body and turn signal lamp light guide body have different light guiding characteristics, enabling differentiated light emission feeling and range for each function while using the same outer lens.
2Loss of information
If separate light emitting surfaces are formed for position lamp and turn signal lamp, then light emission feeling can be differentiated, but the lamp unit size increases
Solution Approach 1:
The patent merges the light emission function into a single common outer lens while maintaining separate light guide bodies internally. This combines the optical output interface into one shared component, reducing overall size, while the internal segmentation preserves light emission differentiation.
Solution Approach 2:
The patent resolves the size conflict by moving the differentiation mechanism from the external light emitting surface dimension to the internal light guide body structure dimension. The differentiation is achieved in the internal optical path rather than through separate external surfaces.
3Volume of moving object
If LED light sources of two colors are incorporated into a shared light emitting surface, then lamp unit size is reduced, but light emission range and spread appear similar despite color differences
Solution Approach 1:
The patent segments the light guiding path into function-specific light guide bodies. Each light guide body is optimized to control the emission range and spread for its specific lamp function, ensuring that position lamp and turn signal lamp have distinctly different light emission characteristics despite using the same outer lens.
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 design enhances visibility by differentiating light emission feeling and range between turn signal and position lamps, improving distinguishability and reducing the lamp unit's size by using a common outer lens for both functions.
Implementation Method 1
a first light guide body configured to guide light from the first light source to the outer lens; and a second light guide body configured to guide light from the second light source to the outer lens
Data Source
AI summary
A lamp unit for illuminating a front through an outer lens includes a first light source disposed on a back side of the outer lens, a second light source disposed on the back side of the outer lens, a first light guide body configured to guide light from the first light source to the outer lens, and a second light guide body configured to guide light from the second light source to the outer lens. The second light guide body overlaps the first light guide body from a front side in a front view. The first light guide body protrudes outward from the second light guide body. A part of light from the first light guide body is transmitted through the second light guide body and guided to the outer lens.