Stanley Electric Co., Ltd

Stanley Electric Cp., Ltd.

Tomonori Abe

Toshiyuki Terada

Mitsunari Yoshida

Tomio Nakaya

Kazuaki Kawasaki

There is provided a fluorescent lamp comprising a tubular glass bulb, an internal electrode provided at the center of the tubular glass bulb, a fluorescent layer formed on an inner surface of the tubular bulb, and an external electrode provided on an outer surface of the tubular glass bulb, said tubular glass bulb being charged with a rare gas containing xenon as a main ingredient, wherein the charged pressure of the rare gas is 100 to 300 torr, the inner diameter of the tubular glass bulb is 4 to 12 mm and the thickness of the tubular glass bulb is 0.4 to 1.2 mm. As a result, lighting voltage is greatly reduced, whereby the charged pressure of the rare gas can be increased, thereby making it possible to improve illuminance.

Fluorescent lamp

A fluorescent lamp includes a tubular glass bulb, an internal electrode provided substantially along the central axis of the tubular glass bulb, a fluorescent layer provided on the inner surface of the tubular glass bulb, and an external electrode provided on the outer surface of the tubular glass bulb, wherein the internal electrode, having a coiled shape, is laid in the tubular glass bulb with an appropriate tension. According to the present invention, it is possible to prevent a sag in the internal electrode from occurring due to a difference in coefficient of thermal expansion between the tubular glass bulb and a metallic member forming the internal electrode, and to prevent either the tubular glass bulb or the internal electrode from being broken because of an excessive stress, thereby overcoming the problem concerning such type of fluorescent lamp.

Fluorescent lamp with coil shaped internal electrode

Since the internal electrode of a fluorescent lamp comprises a base portion made from a transparent glass member having substantially the same thermal expansion coefficient as that of a tubular glass bulb and shaped like a pipe or rod and a conductive and transparent film formed on the surface of the base portion, the thermal expansion coefficient of the internal electrode is made equal to that of the tubular glass bulb to prevent damage caused by temperature variations, and the entire internal electrode 4 is transparent so that all the beams from the fluorescent film can be radiated to the outside without being shaded.

There is provided an aperture type fluorescent lamp comprising a tubular bulb, an electrode, and a fluorescent layer formed on an inner surface of said tubular bulb in an axial direction of the tubular bulb, an aperture portion provided in said fluorescent layer along the axial direction of the tubular bulb so as to be made the aperture portion as a radiation portion, wherein said aperture portion comprises an aperture portion fluorescent layer having a thickness smaller than the fluorescent layer of other portions. The fluorescent lamp according to the present invention makes it possible to eliminate nonuniformitiy in illuminance.

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Kanagawa-ken, Japan

Tomonori Abe