Short Arc Discharge Lamp Dual-Section Reflection Surface
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Solution Overview
Problem
The illuminance of short arc discharge lamps decreases over time due to the displacement of the luminous spot away from the focal point of the reflection surface, leading to variations in light output.
Innovation Solution
The lamp features a reflection surface with two sections: a first section with a focal point between the cathode and anode, and a second section with a focal point displaced forward, allowing the second section to receive light as the luminous spot moves, maintaining consistent illuminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single focal point reflection surface is used, then the lamp provides high illuminance in early operation stages, but illuminance decreases over time as the luminous spot displaces from the focal point
Solution Approach 1:
The reflection surface is divided into two distinct sections: a first section with a first focal point positioned between the cathode and anode for early operation stages, and a second section with a second focal point positioned forward for later operation stages when the luminous spot displaces. This segmentation allows each section to independently handle light reflection at different operational phases, maintaining consistent illuminance throughout the lamp's lifetime.
Solution Approach 2:
Different sections of the reflection surface are assigned different optical properties with distinct focal points. The first reflection surface section has optimized curvature for early operation, while the second section has different curvature optimized for later operation when the luminous spot has displaced. This local differentiation ensures that regardless of luminous spot position, there is always an appropriate reflection section to maintain high illuminance.
2Illumination intensity
If the reflection surface focal point is positioned between cathode and anode, then early operation illuminance is maximized, but illuminance varies as the luminous spot moves away from the focal point
Solution Approach 1:
The reflection surface is segmented into two functional zones with different focal points. The first section handles light reflection when the luminous spot is near the initial focal point between cathode and anode, while the second section takes over when the luminous spot displaces forward during operation. This ensures reliable, consistent illuminance across the entire operational lifecycle.
Solution Approach 2:
The second reflection surface section is pre-configured with a forward-displaced focal point to anticipate and compensate for the inevitable displacement of the luminous spot during operation. This preliminary arrangement ensures that when the luminous spot moves, the second section is already positioned to maintain optimal light reflection and illuminance consistency.
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 ensures that the lamp maintains consistent illuminance by adjusting the light reception area as the luminous spot shifts, reducing variations in light output over time.
Implementation Method 1
a body (10) including therein a reflection surface (11) curved in a concave shape
Data Source
AI summary
A short arc discharge lamp that includes: a body that includes a reflection surface and a front opening, the reflection surface is curved in a concave shape and includes a first reflection surface section having a shape along a first quadric surface of revolution and a second reflection surface section having a shape along a second quadric surface of revolution; a cathode and an anode opposed to each other in discharge space defined by the reflection surface; and a window member covering the front opening. The first reflection surface section has a focal point at a position between the cathode and the anode, and the second reflection surface section is continuous from the first reflection surface section, and has a focal point at a position displaced toward front from the focal point of the first reflection surface section.