MERCURY-FREE LAMP AND LAMP APPARATUS

摘要

A mercury-free lamp including: a glass bulb (4) that is filled with a rare gas; a first internal electrode unit (19) and a second internal electrode unit (15) that are provided in the glass bulb (4); and an external electrode (24) that is provided on an outer surface of the glass bulb (4) in an area that corresponds to a discharge path, which is formed during lighting between the first internal electrode unit (19) and the second internal electrode unit (15), such that a positive column is generated along the discharge path and is expanded in transverse sectional area by the external electrode. The first internal electrode unit (19) is composed of internal electrodes (18) and (20), and the second internal electrode unit (15) is composed of internal electrodes (14) and (16).