Electrostatic shield to reduce wall damage in an electrodeless h

Details Electrostatic shield to reduce wall damage in an electrodeless h Electrostatic shield to reduce wall damage in an electrodeless h

1993-10-05

1995-08-01

Horabik, Michael

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313635, 313607, 313234, 313313, 315 85, 315248, H01J 6100, H01J 6135

Patent

active

054382351

ABSTRACT:
An electrostatic shield is provided between the induction coil and the arc tube of an electrodeless HID lamp. In one embodiment, the shield is a transparent glass cylinder coated with a thin, transparent, conductive layer of tin oxide. In another embodiment, the electrostatic shield is a conductive, transparent tin oxide coating applied to either the inner or outer surface of an outer light-transmissive jacket surrounding the arc tube. The tin oxide layer is discontinuous so as to minimize currents induced in the conductive tin oxide layer by the induction coil. The thickness of the tin oxide layer is sufficient to make it conductive and form an approximately equipotential surface, thereby shielding the arc tube and plasma discharge from intense electric fields, reducing arc tube wall damage and increasing lamp life. In addition, tin oxide functions as an infrared reflector which returns infrared radiation to the arc tube, resulting in higher efficacy. Other advantages of the electrostatic shield include: a lower color temperature, further improving efficacy; and a lower rate of free iodine formation in lamps employing metal iodide fills, further reducing wall damage.

REFERENCES:
patent: 4727295 (1988-02-01), Postma et al.
patent: 5270615 (1993-12-01), Chung

Affiliated with

Also associated with

Rating

Electrostatic shield to reduce wall damage in an electrodeless h does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electrostatic shield to reduce wall damage in an electrodeless h, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrostatic shield to reduce wall damage in an electrodeless h will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-735367