Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Pulsating or a.c. supply to the cathode or heater circuit
Patent
1994-03-17
1996-12-10
Pascal, Robert
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Pulsating or a.c. supply to the cathode or heater circuit
315107, 315360, H05B 3700
Patent
active
055833969
ABSTRACT:
A metal halide lamp is employed, as a light source, in an optical device such as, for example, an illuminator or an image display. The optical device includes a discharge tube filled with mercury, at least one rare gas, and at least one metal halide, and a pair of electrodes spaced from each other and enclosed in the discharge tube. The optical device also includes an electric circuit, electrically connected to the pair of electrodes, for starting the discharge tube by applying thereto a higher voltage than a voltage to be applied at a steady state to thereby cause an arc discharge in the discharge tube. When the lamp is turned off, power supply thereto from the electric circuit is temporarily interrupted, and when the lamp cools after a first time interval has elapsed subsequent to the interruption of the power supply, a starting voltage is applied to the lamp via the pair of electrodes for a second time interval to cause redischarge. Thereafter, the power supply to the lamp is interrupted after the second time interval has elapsed, to thereby turn off the lamp.
REFERENCES:
patent: 4215292 (1980-07-01), Inui et al.
patent: 4642525 (1987-02-01), Widmayer
patent: 4791338 (1988-12-01), Dean et al.
patent: 5056912 (1991-10-01), Hamada et al.
patent: 5355187 (1994-10-01), Ogino et al.
"Problems Unique to Metal Iodide Arc Lamps", MIT Press 1971, pp. 254-258.
Hideaki Omura
Tabata Munehiro
Takeuchi Nobuyoshi
Wakamiya Masayuki
Matsushita Electric - Industrial Co., Ltd.
Pascal Robert
Vu David H.
LandOfFree
Optical device with metal halide discharge lamp having enhanced does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical device with metal halide discharge lamp having enhanced , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical device with metal halide discharge lamp having enhanced will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-425956