Five-Element Vehicle Lamp Layout for Balanced Luminance
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Solution Overview
Problem
Increasing the number of light emitting elements in vehicle lighting devices leads to unbalanced luminance distribution, making it difficult to achieve a desired light distribution pattern.
Innovation Solution
A vehicle lighting device with a specific arrangement of five light emitting elements, including one at the center and four surrounding it, divided into smaller regions to ensure uniform luminance distribution, with each element's luminance contributing to a total of 90% or more of the device's total luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of light emitting elements is increased to achieve high luminous flux, then the total luminance increases, but the luminance distribution becomes unbalanced
Solution Approach 1:
The patent applies local quality by assigning different luminance characteristics to different regions of the light emitting elements. Specifically, the light emitting surface is divided into a central region and a peripheral region, where the central region has higher luminance and the peripheral region has lower luminance. This non-uniform luminance distribution across different locations compensates for the natural tendency toward unbalanced distribution when multiple elements are arranged, achieving both high total luminous flux and balanced overall luminance distribution.
2Power
If multiple light emitting elements are arranged to increase luminous flux, then the total light output increases, but the difficulty of achieving desired light distribution pattern increases
Solution Approach 1:
The patent applies parameter changes by modifying the luminance characteristics of different regions of the light emitting elements. By changing the luminance parameter from uniform to non-uniform (with the central region having higher luminance and the peripheral region having lower luminance), the system achieves better light distribution control without increasing device complexity. This parameter modification allows multiple elements to work together more effectively as a unified system.
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 vehicle lighting device to achieve a desired luminance distribution even with increased light emitting elements, ensuring uniform light irradiation and maintaining high luminance efficiency.
Implementation Method 1
vehicle lighting devices equipped with light emitting elements such as light emitting diodes
Data Source
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AI summary
Provided are a vehicle lighting device (1) and a vehicle lamp (100) capable of achieving a desired luminance distribution even if the number of light emitting elements is increased. The vehicle lighting device (1) according to an embodiment includes a socket (10); a substrate (21) provided on one end portion side of the socket (10); one first light emitting element (22a) provided on the substrate (21); and four second light emitting elements (22b) provided on the substrate (21). A square luminance distribution region orthogonal to a central axis of the vehicle lighting device (1) is defined on light irradiation sides of the first light emitting element (22a) and the second light emitting elements (22b). A center of the luminance distribution region overlaps the central axis of the vehicle lighting device (1). The luminance distribution region is equally divided into four square first regions whose corners overlap the center of the luminance distribution region. Each of the four first regions is equally divided into nine square second regions. A length of one side of the second region is 0.8 mm. When XY coordinates of the center of the luminance distribution region are (0, 0), a center of the first light emitting element (22a) is located at (0, 0), and centers of the four second light emitting elements (22b) are located at (0.8, 0.8), (-0.8, 0.8), (0.8, -0.8), and (-0.8, -0.8). The luminance of the luminance distribution region is 90% or more of a total luminance of light emitted from the vehicle lighting device (1). In twenty second regions arranged along sides of the luminance distribution region, the luminance of one of the second regions is 2% or less of the total luminance. In sixteen second regions provided inside the twenty second regions, the luminance of one of the second regions is 3% or more and 10% or less of the total luminance.