Electricity: measuring and testing – Electric lamp or discharge device – Vacuum tube
Reexamination Certificate
2005-12-21
2009-12-29
Nguyen, Vincent Q (Department: 2831)
Electricity: measuring and testing
Electric lamp or discharge device
Vacuum tube
C324S410000, C315S291000
Reexamination Certificate
active
07639017
ABSTRACT:
Methods for preventing blackening of a gas filled arc tube of a mercury vapour discharge lamp. Lamp voltage and slope, as well as lamp current and slope are analyzed to determine the state of mercury saturation of the gas in the arc tube. A first control signal is sent to alter the lamp power and a second control signal is sent to alter the level of cooling of the lamp according to the state of mercury saturation. Methods for driving a mercury vapour discharge lamp using a monitoring arrangement and analyzing unit to dynamically control the lamp power and the level of cooling of the lamp are described.
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Takashi Toyooka, et al: Illumination Control System for Adaptive Dynamic Range Control, SID International Symposium, May 25, 2004, pp. 174-177, XP007011825.
Koninklijke Philips Electronics , N.V.
Nguyen Vincent Q
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