Low-pressure mercury vapor discharge lamp and illuminator

Abstract

A low-pressure mercury vapor discharge lamp (101) includes a translucent airtight container (1), a pair of electrodes (2) and (2′) mounted in the airtight container (1) and arranged at both ends and so that a distance of one of the electrodes from the sealing portions (1a) and (1a′) becomes longer than that of the other electrode, a mercury emission body (5) filled in the airtight container and discharge medium including mercury discharged from the mercury emission body (5) and inert gas. A cold spot is formed at one sealing portion (1a) of the low-pressure mercury vapor discharge lamp (10) and mercury is filled by the mercury emission body (5) and therefore, there is almost no excess mercury existing in the tube (1), luminous flux starts up fast, mercury collected in the cold spot scarcely moves to other portion, and the lamp characteristic is stabilized.

Claims aren’t available for this document.