High-Pressure Discharge Lamp Sealed Part Structure
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Solution Overview
Problem
The existing methods for enhancing pressure proof performance in high-pressure discharge lamps, particularly those using glass-tube mounts, often result in the formation of internal corners that can lead to airtightness loss and damage when the internal pressure increases, limiting the lamp's ability to operate at higher pressures.
Innovation Solution
A method involving the radial constriction of glass tubes away from the metallic foil towards the electrode tip, followed by air-tight sealing, to create a smooth tapered surface that matches the electrode's diameter, thereby preventing the formation of internal corners during assembly and enhancing pressure resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass-tube mounts are used to enhance pressure proof performance, then airtightness is improved, but internal corners form at the interface between glass tube and sealed container, creating weak points that can lead to damage at high pressures
Solution Approach 1:
The glass tube is radially constricted before assembly with the sealed container, creating a tapered shape in advance. This preliminary action prevents the formation of internal corners during assembly, as the tapered surface allows smooth contact between the glass tube and the sealed container interface, eliminating stress concentration points that would occur with sharp edges
Solution Approach 2:
The radial constriction changes the geometric parameters of the glass tube, transforming it from a uniform cylindrical shape to a tapered shape with varying diameter along its length. This parameter change ensures that the smaller-diameter portion fits smoothly into the sealed container without forming internal corners, while maintaining the airtight sealing function
2Illumination intensity
If internal pressure is increased to enhance luminous efficiency, then luminous output is improved, but the risk of damage at sealed parts increases due to existing internal corners
Solution Approach 1:
The glass tube is radially constricted before assembly to create a tapered shape that prevents internal corner formation during sealing. This preliminary geometric modification ensures that when high pressure is applied for enhanced luminous efficiency, there are no stress concentration points at the sealed part interface, allowing the lamp to withstand higher internal pressures without damage
Solution Approach 2:
By changing the geometric parameters of the glass tube through radial constriction, the patent creates a tapered configuration that distributes stress more evenly across the sealing interface. This parameter change enables the sealed part to withstand the high internal pressures required for enhanced luminous efficiency without suffering damage at the seal interface
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 approach reduces the likelihood of edge formation, enhances airtightness, and allows the lamp to operate at higher pressures with improved sealing, reducing the risk of damage and increasing luminous efficiency.
Implementation Method 1
radially constricting the glass tube at a first position located away from the metallic foil toward the tip of the electrode
Data Source
AI summary
A method of manufacturing a high-pressure discharge lamp, comprising the steps of: inserting a mount into an interior of a glass tube having an outer diameter smaller than an inner diameter of an end part of a sealed container; radially constricting the glass tube at a first position located away from a metallic foil toward a tip of an electrode; sealing the mount by a region of the glass tube that ranges from the first position to at least the other end of the metallic foil; protruding the electrode out of the glass tube located away from the first position toward the tip of the electrode to form a glass-tube air-tightly sealed mount; inserting the sealed mount into the end part of the sealed container; and radially constricting the end part of the sealed container to sealing the glass tube of the sealed mount by the end part.