Discharge Lamp Driving Device for Projector Electrode Maintenance
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Solution Overview
Problem
Discharge lamps in projectors face issues with unstable discharge and reduced service life due to inadequate melting of electrode protrusions in low-power modes, leading to increased distance between electrodes and decreased illuminance.
Innovation Solution
A discharge lamp driving device that alternates between stationary lighting and high-power driving modes, adjusting drive power based on the state of electrode protrusions to maintain stable discharge and prevent excessive melting, using a control unit to set execution information for high-power driving based on stored information and real-time conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If low-power mode is used to extend lamp service life, then electrode protrusions cannot be melted sufficiently, but this causes protrusion wear and reduced illuminance
Solution Approach 1:
The patent implements periodic high-power driving at predetermined intervals during low-power operation. This periodic high-power action melts the electrode protrusions to maintain their shape, preventing excessive wear and electrode distance expansion, thereby maintaining illuminance while extending overall lamp service life through predominant low-power operation.
Solution Approach 2:
The patent applies high-power driving in advance at predetermined intervals to melt and maintain the shape of electrode protrusions before they can wear down significantly. This preliminary maintenance action prevents the accumulation of protrusion wear that would otherwise lead to reduced illuminance and shortened lamp life.
2Stability of the object's composition
If high-power driving is used to melt electrode protrusions, then protrusions can be maintained, but excessive melting occurs causing lamp flicker and arc tube damage
Solution Approach 1:
The patent applies high-power driving at controlled intervals and for limited durations, using just enough power to maintain protrusion shape without causing excessive melting. This partial application of high-power driving achieves the necessary electrode maintenance while avoiding the harmful effects of continuous or excessive high-power operation.
Solution Approach 2:
The patent uses periodic high-power driving at predetermined intervals rather than continuous high-power operation. This periodic approach allows the electrode protrusions to be maintained at optimal shapes while providing sufficient cooling and stabilization periods, preventing excessive melting and maintaining lamp reliability.
3Stability of the object's composition
If continuous high-power driving is applied, then electrode protrusions are melted, but this causes crystallization of quartz glass and devitrification
Solution Approach 1:
The patent implements periodic high-power driving with intervals between applications, allowing the arc tube to cool and stabilize between high-power pulses. This prevents continuous thermal stress that would cause quartz glass crystallization and devitrification, while still achieving sufficient electrode protrusion maintenance.
Solution Approach 2:
The patent applies high-power driving partially and intermittently rather than continuously, using just enough power and duration to maintain electrode shapes without subjecting the arc tube to excessive thermal loads that would cause glass crystallization and structural damage.
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 ensures stable discharge and extended service life of the lamp by maintaining optimal electrode protrusion shape, reducing flickering, and minimizing the load on the arc tube, thereby enhancing the projector's performance and reliability.
Implementation Method 1
a discharge lamp having electrodes... in which second drive power that is higher than the first drive power is supplied to the discharge lamp
Implementation Method 2
the magnitude of a heat load applied to protrusions at distal ends of the electrodes at the time of the high-power driving can be adjusted... excessive melting of the protrusions can be retained
Data Source
AI summary
A discharge lamp driving device includes: a discharge lamp driving unit which supplies drive power to a discharge lamp having electrodes; a storage unit which stores information with respect to the discharge lamp; and a control unit which controls the discharge lamp driving unit, wherein the control unit is configured to execute a stationary lighting driving in which first drive power is supplied to the discharge lamp and a high-power driving in which second drive power that is higher than the first drive power is supplied to the discharge lamp, and the control unit sets first execution information of the high-power driving on the basis of first information with respect to the high-power driving stored in the storage unit, at a predetermining setting timing, and controls the discharge lamp driving unit according to the first execution information.