Discharge Lamp Electrode Coil Structure for Wear Reduction
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Solution Overview
Problem
Existing discharge lamps face issues with increased inter-electrode distance and electric discharge between electrodes and the luminous tube, leading to reduced lifespan due to electrode wear and devitrification.
Innovation Solution
The discharge lamp design features electrodes with a core material and a coil section where a metal wire is wound in three or more layers, with a distal end portion and a rear end portion having specific diameter sections to maintain an appropriate inter-electrode distance and reduce electric discharge, including a first diameter section and a second diameter section smaller than the first, positioned farther from the coil section, and a step section with decreasing diameter from the coil section towards the rear end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driving current supplied to the discharge lamp is increased to maintain appropriate inter-electrode distance, then the inter-electrode distance is maintained, but the electrodes are worn by heat and their capacity is reduced
Solution Approach 1:
The patent changes the physical parameters of the electrode by winding metal wire in three or more layers to form a coil section, creating a multi-layered structure with increased capacity and density. This structural parameter change allows the electrode to withstand higher driving currents without excessive wear, resolving the contradiction between maintaining inter-electrode distance and extending electrode lifespan.
2Quantity of substance
If the coils are doubly wound on the shaft sections to increase electrode weight, then the electrode capacity is increased, but the entire shape of the electrodes becomes long and the distance between electrode rear end portions and luminous tube wall is reduced
Solution Approach 1:
The patent applies local quality by creating different structural zones along the electrode: a coil section with three or more layers for increased capacity at the distal end, and a rear end portion with smaller diameter for maintaining distance from the luminous tube. This localized structural differentiation allows the electrode to have high capacity where needed while avoiding electric discharge at the rear end.
Solution Approach 2:
The patent transitions from a simple linear electrode structure to a multi-dimensional coil structure by winding metal wire in three or more layers around the core material. This dimensional change increases the electrode's capacity and density without significantly extending its length, allowing sufficient capacity while maintaining appropriate distance from the luminous tube wall.
3Quantity of substance
If the electrode distal end portions are positioned far from the large diameter sections to increase electrode weight, then the electrode capacity is increased, but the protrusion sections cannot be maintained and the inter-electrode distance increases
Solution Approach 1:
The patent applies preliminary action by pre-forming the coil section with three or more layers at the electrode distal end before operation. This pre-structured coil section serves as a reservoir of electrode material that continuously supplies substance to maintain the protrusion sections during operation, ensuring stable inter-electrode distance and reliable电弧 discharge.
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 configuration enhances the electrode's capacity and density, reducing wear and electric discharge, thereby extending the discharge lamp's lifespan while maintaining luminance and preventing devitrification.
Implementation Method 1
a coil section in which a metal wire is wound on the core material in three or more layers
Implementation Method 2
electric discharge that occurs between the electrodes and the luminous tube, in particular, electric discharge that occurs between the rear end portions of the electrodes, which have a short distance to a luminous tube wall, and the inner wall of the luminous tube
Implementation Method 3
a factor of reducing the life of the discharge lamp include devitrification of the luminous tube and an increase in an inter-electrode distance due to wear of the electrodes
Data Source
AI summary
A discharge lamp includes a luminous tube and a pair of electrodes. At least one of the pair of electrodes includes a core material, a coil section in which a metal wire is wound on the core material in three or more layers, a distal end portion made of a conductor and provided, with respect to the coil section, at an end portion of the core material on a side where the other electrode is disposed, and a rear end portion made of a conductor and provided on the opposite side of the distal end portion with respect to the coil section. The rear end portion includes a first diameter section having a first diameter and a second diameter section having a second diameter smaller than the first diameter and present in a position farther from the coil section than the first diameter section.