Electrodeless lamp
AssigneeITW Limited
InventorsFloyd R. Pothoven, Terry A. Pothoven
Life of this patent
Estimating the term…
Abstract
A lamp 1 has a body 2 of sintered alumina ceramic material and an artificial sapphire window 3. The body 2 is initially molded in green state and the window is pressed into a front recess 4. The combination is fired at a temperature of the order of 1500° C., to fuse the body into a coherent pressure-tight state with the window. After partial cooling to the order of 600° C., a pellet of excitable material is added through a rear, charging aperture 5. A disc 6 of ceramic with frit 7 is placed over the aperture. The disc is irradiated by laser to fuse the frit and the disc to the body, thus sealing the excitable material into the lamp.
Claims18
A body for an electrodeless lamp of ceramic material and containing excitable material, the body comprising:
- a one piece body preform of entirely sintered ceramic material, defining the shape of the body which is hollow;
- and
- a translucent window on the body, the window and the preform being a coherent unit resulting from the window having been pressed onto the preform when green and the window having been united to the preform on firing of the ceramic material for entirely sintering the body preform;
- the body further comprising:
- an aperture in the entirely sintered preform for charging the excitable material into the hollow body.
A body for an electrodeless lamp of ceramic material and containing excitable material, the body comprising:
- a one piece body preform of sintered ceramic material, defining the shape of the body which is hollow;
- an aperture in the preform for charging the excitable material into the hollow body;
- and
- a translucent window, the window and the preform being a coherent unit resulting from the window having been pressed onto the preform when green and the window having been united to the preform on firing of the ceramic material, wherein the aperture in the preform has a surrounding formation which is collapsible on laser irradiation to seal the aperture, the aperture preferably being at an end of the preform opposite from the window.
A body for an electrodeless lamp of ceramic material and containing excitable material, the body comprising:
- a one piece body preform of sintered ceramic material, defining the shape of the body which is hollow;
- an aperture in the preform for charging the excitable material into the hollow body;
- and
- a translucent window, the window and the preform being a coherent unit resulting from the window having been pressed onto the preform when green and the window having been united to the preform on firing of the ceramic material, the body being sealed at its charging aperture and containing excitable material, wherein the aperture in the preform has a surrounding formation which is collapsible on laser irradiation to seal the aperture, the aperture being at an end of the preform opposite from the window, the formation around the aperture being collapsed to seal it.
A body for an electrodeless lamp of ceramic material and containing excitable material, the body comprising:
- a one piece body preform of sintered ceramic material, defining the shape of the body which is hollow;
- a translucent window on the body, the window and the preform being a coherent unit resulting from the window having been pressed onto the preform when green and the window having been united to the preform on firing of the ceramic material for sintering of the body preform;
- and
- an aperture in the sintered preform for charging the excitable material into the hollow body, the aperture having:
- a surrounding formation which is collapsible on laser irradiation to seal the aperture.
Dependencies are inferred from the claim text.