Narrow beam low-pressure sodium vapour discharge lamp

Details Narrow beam low-pressure sodium vapour discharge lamp Narrow beam low-pressure sodium vapour discharge lamp

H - Electricity

01

J

313/10

H01J 7/24 (2006.01) H01J 61/34 (2006.01)

Patent

CA 1043410

ABSTRACT The invention relates to a low pressure sodium vapour discharge lamp for generating a directed light beam in which the lamp is provided with a cylindrical discharge tube which is enveloped by a cylindrical outer bulb. Accord- ing to the invention the inside of the outer bulb is provided, in a cross-section of the lamp over at least 270 degrees of arc, with a reflecting layer which has a large reflection factor for sodium light and a very small reflection factor for infra-red radiation. This reflecting layer may consist of titanium dioxide (TiO2). The lamp according to the invention may for example be used in an exposure apparatus for photo- copying texts and figures.

239729

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