Point-like lamp with anode chimney
AssigneeAdvanced Radiation Corporation
InventorRaymond E. Paquette
Life of this patent
Estimating the term…
Abstract
A high-intensity arc lamp comprises a glass envelope with a pressurized gas atmosphere. A cathode and an anode structure are disposed within. A pointed tip of the cathode is juxtaposed by a central hole in a face of the anode and a small gap between them. Such central hole is vented away from the arc down inside the anode structure. During operation, heat from the arc at the entrance to the central hole drives a wind of xenon gas down through such vents in the anode structure.
Claims10
An improved high-intensity electric arc lamp with a glass envelope containing a gas atmosphere, a cathode, and an anode, the improvements comprising:
- a central vent hole disposed in an anode head, and juxtaposed to a sharp tip end of a cathode;
- and
- a vent internal to the anode head and providing for a leading away of heated gases from an arc area immediately in front of said central vent hole.
A method of operating an arc lamp with a short arc length, the method comprising the steps of:
- forming a hole in an anode at a point that faces a pointed tip of a cathode;
- and
- venting said hole away to promote a circulation of gases contained within a glass envelope.
A method of operating an arc lamp with an arc length of about 0.050 to 0.040 inches, the method comprising the steps of:
- forming a hole in an anode at a point that faces a pointed tip of a cathode;
- venting said hole away to promote a circulation of gases contained within a glass envelope;
- and
- surrounding said hole with a convex dished reflector disposed in a cathode-facing surface of said anode.
A digital light projection (DLP) system, comprising:
- an arc lamp including:
- a central vent hole disposed in an anode head, and juxtaposed to a sharp tip end of a cathode;
- and
- a vent internal to the anode head and providing for a leading away of heated gases from an arc area immediately in front of said central vent hole;
- a first optics system for focusing light from said arc area to a first focus;
- a digital micromirror device (DMD) located at said first focus and having a video input and a reflected-light image output;
- and
- a second optics system for receiving said reflected-light image output from the DMD and for projecting it on to a second focus and image display screen.
Dependencies are inferred from the claim text.