Starting Light Source External Electrode Holder Design
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Solution Overview
Problem
Existing light source devices for liquid crystal and DLP projectors face challenges in achieving reliable and efficient UV-light radiation to high pressure discharge lamps, particularly due to complex structures and difficulties in positioning and fixing the starting light source, leading to inadequate starting performance under cold and hot conditions.
Innovation Solution
A light source device with a high pressure discharge lamp and a starting light source that includes a discharge tube with an internal and external electrode, where the external electrode is formed with a holder made from a bent metal sheet to grip and hold the discharge tube, allowing for easy positioning and increased UV-light radiation to the lamp's discharge chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of turns of the coiled external electrode is increased to generate more UV-light, then the UV-light generation amount increases, but the UV-light is shielded by the external electrode and cannot be radiated to the discharge chamber
Solution Approach 1:
The external electrode is divided into multiple coil turns that are strategically positioned to generate UV-light at different locations around the discharge tube. This segmentation allows the electrode to provide comprehensive UV-illumination while preventing self-shielding, as each coil segment contributes to the overall lighting without blocking light from other segments.
2Ease of operation
If the connection of lead and coils is used to hold the discharge tube at a predetermined position, then electric connection is achieved, but positioning for the discharge tube becomes difficult and the structure is complicated when fixing means are provided
Solution Approach 1:
The external electrode structure merges the functions of electrical connection and mechanical positioning into a single integrated component. The coil structure itself serves both as the electrical conductor for generating UV-light and as the mechanical support that holds the discharge tube at the correct position, eliminating the need for separate fixing means and simplifying the overall structure.
Solution Approach 2:
The external electrode is designed to perform multiple functions simultaneously: it provides electrical connection for the discharge circuit, generates UV-light through glow discharge, and mechanically positions the discharge tube. This multi-functionality reduces the number of components needed and simplifies the assembly process.
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 enhances the starting performance of the high pressure discharge lamp by increasing the UV-light generation and simplifying the attachment and wiring process, improving the lamp's starting performance and reducing manufacturing costs.
Implementation Method 1
glow discharge occurs in the mercury vapor sealed in the glass seal tube 84 as the main body of the discharge tube 80 to generate the UV-light
Implementation Method 2
a starting gas such as mercury and a halogen, for example, bromine and an argon gas is filled
Data Source
AI summary
A starting light source for radiating the UV-light to a discharge chamber upon starting lighting of a high pressure discharge lamp includes a discharge tube for generating the UV-light by a starting voltage applied upon starting lighting the lamp, the discharge tube includes an internal electrode extended from a pinch seal portion formed at one end to a light-emitting portion thereof and an external electrode disposed close to or in contact with both of the light-emitting portion and the pinch seal portion, at least a portion of the external electrode disposed for the light-emitting portion includes a holder formed by bending fabrication of a metal sheet into such a shape of gripping and holding the discharge tube, and a terminal is formed to the holder for fixing and electrically connecting the external electrode to a conductor part having a polarity opposite to that of the internal electrode.