A relatively small-diameter aperture fluorescent lamp is manufactured easily
with
high yield and at low cost. An aperture portion is formed in a manner that a thread-like
member is inserted into a glass tube having an ultraviolet ray reflection layer
and a phosphor layer formed on its inner surface, the glass tube is bent in a predetermined
shape by using a bending jig, the thread-like member is pressed to the phosphor
layer formed in a predetermined region in the bending member side of the glass
tube while both ends thereof are pulled tight, the thread-like member is reciprocated,
and phosphor of the phosphor layer in this region is exfoliated.
