Discharge lamp having automatically controlled preheating device

Details Discharge lamp having automatically controlled preheating device Discharge lamp having automatically controlled preheating device

1987-08-27

1989-01-31

Boudreau, Leo H.

Electric lamp and discharge devices

With temperature modifier

For envelope wall

313 15, 313 42, 313 43, 315116, 315117, H01J 6152, H05B 41231

Patent

active

048018406

ABSTRACT:
To provide for preheating of a high-pressure discharge lamp (6) having a charge vessel (7) closed off by a pinch or press seal (8), a ceramic holder (1), typically a ceramic tube with multiple capillary openings therein, has a heating wire threaded through the capillary openings, and the ceramic holder is located in intimate thermal transfer with respect to the lamp, for example by being placed and cemented in the transition zone between the discharge vessel (7) and the pinch or press seal. Heater power of about 10 W applied to two such ceramic capillary heaters located adjacent both sides of the pinch or press seal permits preheating the fill of the lamp so that 40% of rated light output can be obtained within several seconds after energization of the electrodes. The lamp is suitable as a headlamp for vehicular use and can be constructed in miniature size, with a discharge vessel volume in the range of 100ths cm.sup.3. The ceramic heater together with the supply connection, also within an aperture ceramic tube, forms a generally T-shaped assembly. The heater is maintained in energized condition upon periods when the lamp is deenergized and has its own power supply.

REFERENCES:
patent: 3898494 (1975-08-01), Levy
patent: 4722039 (1988-01-01), Gavgel
patent: 4734612 (1988-03-01), Sasaki et al.

Affiliated with

Also associated with

Rating

Discharge lamp having automatically controlled preheating device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Discharge lamp having automatically controlled preheating device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Discharge lamp having automatically controlled preheating device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-179170