PURPOSE: To prevent exfoliation of films from each other due to electric attracting force by allowing a substance, which is charged in opposite polarities positive and negative when contacting tin oxide of a transparent electroconductive film, to exist on at least the surfaces of particles of titanium oxide which form an ultraviolet ray shutoff film.
CONSTITUTION: A transparent electrode 2 consisting of tin oxide is formed over the inner surface of a glass bulb 1 for a fluorescent lamp concerned, and thereover is directly put an ultraviolet shutoff film 3 consisting of particles of titanium oxide to whose surfaces aluminum oxide is baked fast, and further thereover a fluorescent film 4 is laid. At the end of this laminate a filament is fitted sealedly, and a starter gas such as Ar and an appropriate amount of Hg are encapsulated in the bulb. These tin oxide and titanium oxide have approx. equal charging order and amount of contact charging, to get the same potential when charged to generate a repulsive force, but because of existence of aluminum oxide which has a charging order apart therefrom greatly, they are charged in opposite polarities to each other and are hard to exfoliate with attraction force. Thus the yield of a production line can be enhanced to a great extent.