Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh

Patent-treuhand-gesellschaft F&uuml;r Gl&uuml;hlampen Mbh

Osram Gesellschaft MIT Beschraenuter Hattung

Osram Ag

Plansee Se

Thomas Mehr

Dietmar Ehrlichmann

Roland Stark

Ralf Seedorf

Josef Bauer

Horst Gedack

Gerhard Loeffler

Hans-Hermann Gmeiner

Wolfgang Spielmann

Lars Menzel

Michael Willacker

Herbert Fülz

Inge Staudacher

Stephen Berndanner

Stephan Berndanner

The subject matter of the disclosure is a PAR lamp arrangement having an integral lamp, in particular an integral halogen lamp, which is inserted into a base and is surrounded at least in sections by a reflector, the base and the integral lamp being connected via contact springs, and the reflector being covered by a diffusing screen. According to the invention, the reflector is made from aluminum and is provided with a reflective surface or coating. Owing to the aluminum reflector used and the fact that the integral lamp is held via contact springs, improved holding of the integral lamp is made possible with reduced weight and production complexity.

PAR lamp arrangement

A protective device for a lamp, especially a high-pressure xenon discharge lamp or high-pressure mercury vapor discharge lamp, includes a pressurized lamp vessel and a protective envelope which surrounds the lamps in at least some sections, can be fixed to the lamp by two closures that engage around lamp shafts, and is made of a gas-permeable fleece.

Protective device for a lamp

A short arc high-pressure discharge lamp () for dc operation, includes a discharge vessel () that has two necks () diametrically opposite each other, in which an anode () and a cathode () made of tungsten are melted in a gastight manner, and which has a filling made of at least one noble gas and possibly mercury. According to the invention, at least the material of the cathode tip () contains lanthanum oxide LaOand at least another oxide from the group consisting of hafnium oxide HfOand zirconium oxide ZrOin addition to the abovementioned tungsten.

Short arc high-pressure discharge lamp

A short-arc lamp ( ) with a discharge vessel ( ) which contains an anode ( ) and cathode ( ) which are opposite one another. The filling medium contains inert gases and/or metal vapors, and the anode comprises a body having a front section ( ), a substantially cylindrical body ( ) and a rear face ( ). Provided in the region of the front half of the cylindrical body is a projection ( ) whose radial length (X) projects at least 0.5 mm beyond the cylindrical body ( ).

Short-arc lamp

In a short-arc high-pressure discharge lamp ( ) with a xenon fill for digital projection purposes, the separation L in mm of the two mutually facing end sections ( ) of the cathode ( ) and the anode ( ) when the lamp is hot is given by the relationship 0.8&times;P&lE;L&lE;1&times;P&plus;1, where P is the lamp power in kW. Further, the diameter D of the circular-cylindrical middle section ( ) of the anode ( ) in mm obeys the relationship D&gE;2.1&times;L&plus;10.

Short-arc high-pressure discharge lamp for digital projection technologies

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Dollnstein, Germany

Thomas Mehr