Light Transmitting Member Geometry for Straighter Headlamp Emission
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Solution Overview
Problem
Conventional light emitting devices for headlamps suffer from insufficient visibility due to the short distance light travels before being emitted, resulting in inadequate illumination for drivers.
Innovation Solution
A light emitting device design featuring a substrate with an electrically conductive pattern, a light emitting part with inclined side surfaces, and a light transmitting member with a cross-sectional area decreasing from the lower to the upper surface, along with a reflective member to minimize light loss and enhance light straightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light transmitting member has a large area light exit surface, then light can be emitted effectively, but light travels a short distance resulting in insufficient visibility
Solution Approach 1:
The patent changes the geometric parameters of the light transmitting member by implementing inclined side surfaces with specific angles (first angle and second angle where first angle < second angle). This parameter change transforms the light propagation characteristics, enabling light to travel farther while maintaining effective emission through the optimized exit surface area.
2Illumination intensity
If the light transmitting member has a cross-sectional area gradually decreasing from lower to upper surface, then light straightness is improved, but light loss increases
Solution Approach 1:
The patent converts the potentially harmful light loss into a beneficial effect by using the inclined side surfaces to redirect stray light. The specific angle configuration ensures that light attempting to escape through the sides is reflected back into the light transmitting member, converting what would be loss into useful light that contributes to straighter light propagation and enhanced visibility.
3Quantity of substance
If the light transmitting member covers the entire upper surface of the light emitting chip, then light emission is maximized, but light straightness deteriorates
Solution Approach 1:
The patent applies local quality by creating non-uniform light transmission characteristics through the inclined side surfaces. Different regions of the light transmitting member have different optical functions: the upper surface area emits light while the inclined side surfaces with specific angles redirect stray light. This local differentiation of optical properties enables both sufficient light emission and improved light straightness simultaneously.
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
Improves light straightness and reduces light loss, enabling better visibility for drivers by focusing light onto a smaller exit surface and reflecting stray light back onto the transmitting member.
Implementation Method 1
a light transmitting member and a barrier member formed on an upper surface of the light emitting part... The light transmitting member may include a pair of first side surfaces facing each other and a pair of second side surfaces facing each other. The first side surfaces of the light transmitting member may be inclined at a first angle with respect to a lower surface of the light transmitting member.
Implementation Method 2
a reflective member surrounding side surfaces of the light transmitting member, thereby minimizing light loss while improving straightness of light
Data Source
AI summary
A light emitting device includes a substrate on which a conductive pattern is disposed; a light emitting part including at least one light emitting chip; a light transmitting member disposed on the upper surface of the light emitting part; and a barrier member. The light transmitting member includes a pair of first side surfaces and a different pair of second side surfaces that face each other, and with respect to the lower surface, the first side surfaces may be formed at a first angle and the second side surfaces may be formed at a second angle, and the first angle may be smaller than the second angle.