Ceramic electric-discharge lamp incorporating arc tube having at least two curved regions
AssigneeToshiba Lighting & Technology Corporation
InventorsAkira Itoh, Kazuyoshi Okamura, Kazuiki Uchida
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Abstract
The invention provides a ceramic electric-discharge lamp having a pinch-sealer which is set to an end of an outer envelope and covered by a base having a pair of base pins projecting themselves into the base. The outer envelope is in vacuum, in which an arc tube composed of a square U-shaped tube is installed. Apertures of both ends of the square U-shaped illuminant are closed by ceramic discs each containing an electrode. Linear illuminant is formed in such regions where the radius of curvature of the square U-shaped arc tube greatly varies, in other words, between the curved portions.
Claims8
A ceramic electric-discharge lamp comprising:
- an arc tube which is composed of a translucent ceramic envelope internally sealing a luminous metal, a buffer metal, and an actuating rare gas, said arc tube further sealing a pair of electrodes, one each near an end of said envelope thereof;
- a base member connected to said pair of electrodes sealed inside said arc tube via wiring means, said base member being adapted for connection to an external power source;
- wherein said arc tube has at least two linear portions and curved portions, where a radius of curvature of said curved portions varies against said linear portions, wherein any two adjacent ones of said at least two curved portions define a substantial illuminant therebetween, wherein each of said linear portions comprises a linear wall and each of said curved portions comprises an inner wall and an outer wall and wherein the inner walls are formed to be thicker than the outer walls.
A ceramic electric-discharge lamp comprising:
- an arc tube composed of a translucent ceramic envelope internally sealing a luminous metal, a buffer metal, and an actuating rare gas, and further sealing a pair of electrodes one each near an end of said envelope;
- a base member connected to said pair of electrodes sealed inside said arc tube via wiring means, said base member being adapted for connection to an external power source;
- an outer envelope in which said arc tube is internally held and attached to said base member;
- wherein said arc tube has at least two linear portions and curved portions, where a radius of curvature of said curved portions varies against said linear portions, wherein any two adjacent ones of said at least two curved portions define a substantial illuminant therebetween, and wherein each of said linear portions comprises a linear wall and each of said illuminants comprises an inner wall and an outer wall.
Dependencies are inferred from the claim text.