Discharge Lamp Electrode Ratio for Stable Arc
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Solution Overview
Problem
Discharge lamps without mercury face challenges in maintaining brightness at low power consumption while minimizing discharge deflection due to mechanical vibration, which can lead to flicker and emission color changes.
Innovation Solution
A discharge lamp design with a specific gas pressure and electrode distance ratio (0.085≦m/X≦0.12) ensures required brightness and suppresses discharge deflection, using xenon gas or a mixed gas primarily with xenon, and a pair of electrodes arranged horizontally to maintain stability and color consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the pressure of inert gas sealed in the discharge space is increased to improve brightness, then the required brightness can be secured, but the arcuate discharge becomes liable to be deflected up and down by mechanical vibration
Solution Approach 1:
The patent applies parameter changes by optimizing the ratio of electrode distance to gas pressure (m/X) within the range 0.085-0.12. This parameter optimization allows the discharge lamp to maintain stable arcuate discharge even at higher gas pressures, thereby resolving the contradiction between achieving required brightness and preventing discharge deflection under mechanical vibration.
2Illumination intensity
If the size of the light-emitting part is decreased to improve brightness, then the brightness can be improved, but the distance between the arcuate discharge and metal halide becomes short causing emission color changes
Solution Approach 1:
The patent uses parameter changes by establishing the optimal ratio range of electrode distance to gas pressure (m/X = 0.085-0.12). This parameter optimization enables the light-emitting part to achieve improved brightness while maintaining sufficient distance between the arcuate discharge and metal halide, thereby preventing emission color changes.
3Use of energy by moving object
If power consumption is reduced to meet environmental requirements, then energy efficiency is improved, but the discharge becomes unstable or brightness becomes insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing the ratio of electrode distance to gas pressure (m/X) to fall within 0.085-0.12. This optimization enables the discharge lamp to achieve stable discharge and required brightness at low power consumption (20-30W), thereby resolving the contradiction between energy efficiency and discharge reliability.
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 secures required brightness and suppresses discharge deflection, preventing flicker and emission color changes, even under mechanical vibration, while adhering to low power consumption and mercury-free operation.
Implementation Method 1
a discharge space therein in which a metal halide and a gas are sealed, and a pair of electrodes which protrude toward an inside of the discharge space
Implementation Method 2
Power consumption at a time of stable lighting is 20 W or more and 30 W or less
Data Source
AI summary
According to one embodiment, a discharge lamp includes a light-emitting part including a discharge space therein in which a metal halide and a gas are sealed, and a pair of electrodes which protrude toward an inside of the discharge space and are arranged to face each other while separated by a specified distance. Power consumption at a time of stable lighting is 20 W or more and 30 W or less. When a pressure of the gas sealed in the discharge space is X (atm), and a distance between a center axis of the electrodes and a surface of the metal halide is m (mm), a following expression is satisfied: 0.085≦m/X≦0.12.