# US 4,396,858 A · Halogen incandescent lamp

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- Number: US 4,396,858 A
- Document ID: US4396858A
- Status: Granted
- Kind: A
- Application number: 06/357,964
- Filed: 1982-03-15
- Granted: 1983-08-02
- Earliest claimed: 1979-04-04
- Assignees: U.S. Philips Corporation
- Inventors: Victor R. Notelteirs; Gustaaf F. R. Siaens
- Web page: https://patentgrep.com/patent/US4396858A

## CPC

- H01K 1/38: Seals for leading-in conductors
- H01K: ELECTRIC INCANDESCENT LAMPS (details, apparatus or processes for manufacture applicable to both discharge devices and incandescent lamps H01J; light sources using a combination of incandescent and other types of light generation H01J61/96, H05B35/00)

## Abstract

A two-pinch line voltage halogen incandescent lamps according to the invention has metal foils in the pinches which foils are connected to respective internal current conductors and external conductors. The metal foils extend from the pinches into the cavity formed by the lamp envelope. The internal current conductors have a maximum diameter of 300 .mu.m and are welded to the metal foils in a place situated in the cavity formed by the lamp envelope, in a place situated in the pinch, or both in the cavity and in the pinch. The construction prevents explosion of the lamp as a result of cracking of the pinches caused by a discharge arc.

## Claims

### Claim 1

A line voltage halogen incandescent lamp having a tubular quartz glass lamp envelope which is filled with an inert gas containing hydrogen bromide, a tungsten filament axially disposed in said envelope, and further including two metal foils, said lamp envelope being sealed at each end in a vacuum-tight mannery by means of a respective pinch around a respective one of said metal foils to define a cavity within said envelope, a respective external current conductor welded to the outer end of a respective one of said metal foils extending from each pinch and a respective internal current conductor welded to a respective one of said metal foils extending from within a respective pinch towards the filament, wherein said metal foils each extend from within the relevant pinch into said cavity and the internal current conductors have a diameter of at most 300 micrometers.

### Claim 2 (depends on 1)

A halogen incandescent lamp as claimed in claim 1, wherein each metal foil is welded to a respective one of said internal current conductors in a place situated within the said cavity.

### Claim 3 (depends on 1)

A halogen incandescent lamp as claimed in claim 1, wherein each metal foil is welded to a respective one of said internal current conductors in a place situated within said cavity and also in a place situated within the relevant pinch.