Sensor-Integrated Lamp Layout for Uniform Light Without Interference
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Solution Overview
Problem
Existing lighting devices using light emitting diodes (LEDs) face issues with limited emission angles, interference with detection sensors, and hot spot phenomena leading to non-uniform light distribution, particularly in vehicle applications.
Innovation Solution
A lighting device design featuring a reflective layer with specific pattern groups and a light source configuration that avoids overlapping with sensors, ensuring uniform light emission and minimizing interference, using a substrate with distinct regions and reflective patterns to enhance luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a logo lamp is disposed adjacent to or overlaps with the detection sensor, then the light emitting area of the lamp is increased, but the detection sensor is interfered with by light from the lamp
Solution Approach 1:
The substrate is divided into a first region overlapping the sensor and a second region surrounding the first region. The light source is disposed only on the second region, while reflective pattern groups are disposed on the first region. This segmentation allows the lamp to maintain a large light emitting area while preventing direct light emission from interfering with the sensor.
Solution Approach 2:
Different regions of the substrate are assigned different functions: the first region contains only reflective patterns for light redirection, while the second region contains the light source. This local differentiation enables the lamp to achieve both large emitting area and sensor compatibility by controlling where light is generated versus where light is reflected.
2Use of energy by moving object
If light emitting diodes are used as light sources, then power consumption is reduced and lifespan is extended, but the emission angle of emitted light is relatively small
Solution Approach 1:
The patent uses reflective pattern groups with various shapes (circular, elliptical, polygonal) and arrangements to redirect light in multiple directions. This transforms the inherently narrow directional emission of LEDs into a broader omnidirectional light distribution, effectively increasing the emission angle without changing the LED technology itself.
3Illumination intensity
If a light source is disposed on the substrate, then light emission is achieved, but hot spot phenomenon occurs and uniformity characteristics of the light emitting surface are deteriorated
Solution Approach 1:
The substrate is segmented into multiple regions with different reflective pattern densities and configurations. The first region has reflective patterns optimized for sensor-area light redistribution, while the second region has patterns optimized for overall light emission. This segmentation enables uniform light distribution across the entire emitting surface.
Solution Approach 2:
Different reflective pattern groups are designed with different characteristics (shapes, sizes, densities, arrangements) suited to their specific locations. This local optimization ensures that each region contributes appropriately to achieving overall luminance uniformity, preventing hot spots while maintaining high light emission intensity.
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 effective object detection and uniform light emission by preventing sensor interference and hot spots, maintaining detection accuracy and improving luminance uniformity.
Implementation Method 1
a reflective layer disposed between the substrate and the resin layer and including a plurality of reflective pattern groups
Data Source
AI summary
A lighting device including a light source module including a housing, a substrate disposed on the housing, a light source disposed on the substrate, and a resin layer disposed on the substrate to cover up the light source, and a sensor placed outside the housing to be spaced apart from the housing in a direction where signal from the sensor moves. In addition, the housing is formed with a material through which the signal from the sensor passes.