Trigger Wire Proximity Guide for Discharge Lamp Starting
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Solution Overview
Problem
High pressure discharge lamps used in liquid crystal projectors and projection televisions face challenges with starting and re-starting performance due to poor insulation and increased size requirements, leading to noise generation and mechanical stress issues.
Innovation Solution
A light source device with a trigger wire mounted in a proximity guide portion on the sealing portion, allowing the trigger wire to be in close contact with the light emitting tube's surface for improved starting and re-starting performance, while minimizing thermal expansion effects and maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the starting voltage of the high pressure discharge lamp is increased to enhance starting performance, then the starting performance is improved, but the insulation distance between wirings must be increased, leading to enlargement of the lighting circuit size
Solution Approach 1:
A trigger wire is introduced as an intermediary component to facilitate lamp starting at lower voltages. The trigger wire creates a controlled discharge path that initiates the lamp starting process without requiring high voltage pulses, thereby improving starting performance while avoiding the need for increased insulation distances and larger lighting circuit dimensions.
2Reliability
If the pulse voltage of the high voltage pulse is increased to improve starting performance, then the starting performance is enhanced, but noises causing erroneous operation to electric circuits are generated
Solution Approach 1:
The trigger wire serves as a mediator that enables lamp starting through a controlled low-voltage discharge mechanism. By providing an alternative starting path that does not rely on high voltage pulses, the trigger wire eliminates the noise generation problem while maintaining reliable starting performance.
3Reliability
If the trigger wire is wound around the sealing portion to improve starting performance, then the starting performance is enhanced, but the trigger wire comes into contact with the light emitting tube surface, causing thermal expansion issues and potential damage
Solution Approach 1:
The trigger wire is extracted from the problematic configuration of being wound around the sealing portion and instead is positioned to extend from the electrode assembly toward the light emitting tube surface without direct contact. This extraction eliminates the thermal expansion and mechanical contact issues while preserving the trigger wire's function in enhancing starting performance through controlled discharge.
4Volume of moving object
If the liquid crystal projector size is decreased by using a short arc type high pressure mercury vapor discharge lamp, then the projector size is reduced, but the starting and re-starting performance of the lamp deteriorates
Solution Approach 1:
The trigger wire acts as an intermediary that enables compact lamp design with improved starting performance. By providing a controlled discharge path through the trigger wire, the lamp can be designed in a compact short arc configuration without sacrificing starting or re-starting performance, thus allowing projector size reduction while maintaining 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 significantly enhances the starting and re-starting performance of high pressure discharge lamps, reducing rising time and preventing noise-related issues, while maintaining a compact size and mechanical integrity.
Implementation Method 1
a trigger wire 10 made of a highly heat resistant alloy wire is mounted with one end being connected by directly winding and securing to the power supply lead (6) of the electrode assembly (3L) and with the other end being wound and secured in the inside of the proximity guide portion (C) of the concave groove formed to the outer peripheral portion of the other sealing portion (9R)
Implementation Method 2
the trigger wire 10 is mounted to the high pressure discharge lamp 1 by connecting one end 10a by directly winding and securing to the power supply lead 6 of the electrode assembly 3L protruded from one sealing portion 9L and by winding and securing the other end 10c in the inside of the concave groove 11 formed to the outer periphery of the other sealing portion 9R
Data Source
AI summary
The invention relates to a light source device having a high-voltage discharge lamp (1) on which a trigger line (10) for triggering the lamp is attached. The high-voltage discharge lamp (1) is formed such that an arc tube (7) having a pair of substantially cylindrical sealing portions (9R, 9L) formed on both sides in the longitudinal direction with a light emitting portion (8) in between is sealed with electrode assemblies (3R, 3L). The trigger line (10) is formed such that its one end (10a) is connected to a power supply lead (6), which is of the electrode assembly (3L) and protruded from the one sealing portion (9L), and its other end (10c) is wound around the outer circumference of the other sealing portion (9R). In the light source device, in order to drastically improve the performance for triggering and retriggering the lamp (1), a vicinity guide portion (C) including a hollow groove (11) and an insert opening (17) is formed on a cylindrical portion of the other sealing portion (9R) at a position away from the light emitting portion (8). The vicinity guide portion (C) allows the trigger line (10) to be disposed at a distance shorter than the distance from the electrode assembly to the outer circumference surface of the cylindrical portion.