Method of manufacturing a low-pressure mercury vapor discharge l

Details Method of manufacturing a low-pressure mercury vapor discharge l Method of manufacturing a low-pressure mercury vapor discharge l

1988-07-18

1989-06-27

Lindsay, Robert L.

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

65 55, 65 605, 65112, 65113, 313493, 427 67, C03B 2309

Patent

active

048426350

ABSTRACT:
A method of manufacturing a low-pressure mercury vapor discharge lamp with a discharge vessel comprising two or more substantially parallel co-extending glass discharge tube portions (4 and 5) interconnected through a coupling which extend transversely to the wall of said tube portions. First, the inner wall of an elongate tube is provided with a luminescent material. Then, while heating at least a short zone of the wall, the elongate tube is then divided into two portions. End walls are formed during the division on which the luminescent layer extends the thickness of the tube wall and the temperature of the heated zone are chosen so that no particles of the luminescent material are enclosed in the glass of the end wall during said dividing process and fracture is avoided at least after cooling.
At least at the area of the transition from the end wall to the tube wall, the ratio AB/CD is 0.4 to 0.8.

REFERENCES:
patent: 2103585 (1937-12-01), Kimble et al.
patent: 2722086 (1955-11-01), Mullen
patent: 3212870 (1975-10-01), Condon
patent: 4157909 (1979-06-01), Kachidurian
patent: 4324447 (1982-04-01), van der Wolf et al.
patent: 4426602 (1984-01-01), Mollet et al.

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